GB/T 25753.1-2010Vacuum technology -- Roots vacuum pump -- Measurement of performance characteristics -- Part 1: Measurement of maximum tolerable differential pressure (English PDF)

Foreword

GB/T 25753 "Roots vacuum pumps - Measurement of performance art" is divided into three parts.

--- Part 1 maximum allowable differential pressure measurement;

--- Part 2 compression ratio of zero flow measurement;

--- PART 3 relief valve differential pressure measurement.

This is Part 1 GB/T 25753 of.

This part is proposed by China Machinery Industry Federation.

This part of the National Vacuum Technology Standardization Technical Committee.

This section is responsible for drafting. Zhejiang Vacuum Equipment Group Co., Ltd.

Participated in the drafting of this section. Chengdu South-ray machines Limited, Shenyang Institute of Scientific Instrument Development Center, Shandong Zibo Vacuum Equipment Co., Ltd., Anhui Hefei Science and Technology Co., Ltd., Shenyang Institute of Vacuum Technology.

Introduction

With the development of basic industries and design innovation, design and performance Roots pump structure have made considerable Progress early Roots vacuum pumps must rely on pre-pump operation, and now the development of a direct atmospheric discharge run-cooled Roots Roots vacuum pumps and wet, the other a single series Roots vacuum pump has become the single-stage, two-stage, multi-stage, rotor profile also Futaba become the double leaf, clover, leafy.

Existing Roots vacuum pump performance measure encompasses only a single-stage double-lobe Roots pump, other types of basic not involved, and not made on how to measure the differential pressure relief valve specifications, to effectively improve the Roots vacuum pump performance measurement standards compatibility and suitability for the practical Test measurements provide the necessary operating instructions, drawing in a wide range of domestic and foreign-related indicators, benchmarks, based on the actual situation, the development of the "vacuum Roots vacuum pump performance measurement technology "standards, and is divided into three parts. Extreme pressure and pumping rate of the Roots vacuum pump unit Energy measurements, not according to the standard content. In the future will make the necessary modifications and expansion basis of technological development.

Roots vacuum pumps - Measurement of performance art Part 1. The maximum allowable differential pressure measurement

1 Scope

GB/T 25753 provisions of this part of the Roots vacuum pump the maximum allowable differential pressure measurement method.

This section applies to a pumping speed 30L/s ~ 20000L/s Roots vacuum pump (hereinafter referred to as the pump).

2 Terms and definitions

The following terms and definitions apply GB/T 25753 in this section.

The maximum allowable pressure maximumtolerabledifferentialpressure the maximum allowable pressure refers to the continuous operation of the pump 1h, the maximum allowed by abnormal outlet pressure and the inlet pressure difference does not occur. for Roots vacuum pump inlet pressure measurement should be equal to or slightly less than 1 × 103Pa.

Note. For other types of Roots vacuum pumps without inlet pressure value requirements, but should be appropriate for the structure of the pump, or follow the manufacturer's recommendations.

Test cover testdome

Special vacuum vessel having a predetermined precise shape and dimensions, through which the gas to be measured into the pump, on which pressure measurement Means.

3 Devices