Roots blower quality appraisal

Roots blower is a positive displacement blower that uses two intermeshing impellers. Due to the special design of the impeller geometry, several sealed volumes are formed between them when they rotate. The volume changes continuously with the rotation, allowing air or gas to be transported.
Roots blower has the characteristics of good sealing, smooth operation, low noise, large air output, and energy saving. It is widely used in pneumatic transportation, pneumatic transmission, ventilation and other workplaces in chemical industry, water treatment, printing, textile, construction and other fields.
In the case of Roots blower quality appraisal, Zhongke Testing can provide Roots blower quality appraisal services.

1. Appearance inspection: Check whether the appearance of the Roots blower is damaged or deformed, including the casing, fan, shaft and other parts. If problems are found, they should be repaired or replaced in time.
2. Temperature detection: Roots blower will generate heat during operation, so it is necessary to detect the temperature of bearings and motors. If the temperature is too high, it may be caused by friction or motor failure, and corresponding repairs are required.
3, pressure detection: detect the outlet pressure and inlet pressure when the Roots blower is running. If the pressure is unstable or exceeds the normal range, it may be caused by gas leakage or other reasons and requires inspection and repair.
4. Noise detection: Excessive noise from the Roots blower will affect the working environment and the life of the equipment. Noise detection can determine whether noise reduction is required and take appropriate measures.
5. Vibration detection: If the Roots blower experiences excessive vibration during operation, it may be caused by imbalance or bearing damage, and requires timely maintenance.

JB/T8941-2014 General purpose Roots blower
GB/T 2888-2008 Fan and Roots blower noise measurement method
JB/T 13233-2017 Explosion-proof Roots blower
JB/T 13061-2017 Sound insulation cover for Roots blower

The Roots blower purchased by a company did not meet the technical requirements stipulated in the agreement, and a dispute arose with the equipment manufacturer.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems" with the Roots blower involved in the case.
identification analysis results:
identification analysis expert group discussed the relevant information and on-site investigation of the Roots blower involved in the case and conducted a comprehensive quality and technical analysis, and made the following suggestions and conclusions:
1. The bearing lubricating oil temperatures are 73.1°C and 73.4°C (ambient temperature is 23.5°C), which does not meet the requirement in Article 4.2.2 of JB/T8941.1-2014 "General Purpose Roots Blower Part 1: Technical Conditions" that the lubricating oil temperature should not be higher than 65°C.
2, the root mean square value of the vibration speed of the bearing part is 11.5~16.6㎜/s, which does not meet the requirement of Article 4.2.3 of JB/T8941.1-2014 "General Purpose Roots Blower Part 1: Technical Conditions" that the root mean square value of the vibration speed of the support bearing part should not be greater than 11.2㎜/s. The actual measured speed of
3 and Roots blower is 1015r/min, which does not reach the 1070r/min indicated on the nameplate. The pulley ratio design is wrong.
4. The inspection results show that the volumetric flow rate is 33.7m³/min. Convert according to the speed indicated on the nameplate of the Roots blower. The converted volumetric flow rate is the same as the nameplate flow rate (38m³/m in) deviation is -6.5%, which does not meet the ±4% allowable deviation requirement for volumetric flow specified in Table 1 of Article 4.2.1 of JB/T8941.1-2014 "General Purpose Roots Blower Part 1: Technical Conditions".