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GB/T 33638-2017Vacuum technology -- Turbomolecular pumps -- Measurement of rapid shutdown torque (English PDF)

真空技术涡轮分子泵急停扭矩的测试

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

Level / Type

National · Recommended

Issue date

May 12, 2017

Implementation date

December 1, 2017

Scope

GB/T 33638-2017 is the English-translated version of 真空技术涡轮分子泵急停扭矩的测试.

GB/T 33638-2017 is the identical Chinese adoption of ISO 27892:2010 and gives a test method for the emergency stop, or braking, torque of a turbomolecular pump.

That torque comes from the momentum of the gas driven by the axial flow blades or the spiral passages, and the standard treats the torque about the rotor axis as the main destructive force, leaving smaller forces and torques outside its subject.

It covers two forms of damage: rotor burst and scraping of the rotor or stator blades. It sets the symbols, definitions and units, the items checked, the test conditions, the test device and process, the separate method for the scraping case, and the test report.

Here turbomolecular pump also covers drag and composite molecular pumps. It cites ISO 3529-2. Issued on 12 May 2017, it has applied since 1 December 2017.

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Document preview — GB/T 33638-2017

National Standard of the People's Republic of China

ICS: 23.160
Classification: J 78

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

Preface
Introduction
1 Scope
2 normative reference document
3 Terms and definitions
4 symbols, definitions and units
5 Turbine molecular pump failure test method
5.1 Overview
5.2 Checked items
5.3 broken pump and scratches (rotor damage and blade scratch) test conditions
5.4 Destructive testing device
5.5 Destructive testing process
5.6 "Scratch" Destructive test method (rotor or static film scratch)
6 Test Report
Appendix A (informative) Technical details in the technical drawings and documentation
References

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This standard uses the translation method equivalent to ISO 27892:2010 "vacuum technology turbo molecular pump emergency stop torque test".

And the normative reference in this standard international documents are consistent with the relationship between China's documents are as follows.

Vacuum technology terminology (ISO 3529:1981, MOD)

Introduction

Turbine molecular pump or composite molecular pump in operation at high speed operation when the rotor stored a lot of kinetic energy. If the rotor is damaged, the kinetic energy will be Very short time to release, and may damage the pump housing of the turbomolecular pump. The huge reverse torque will act on the pump housing, fixed the turbine The bolts of the pump may break.

This standard collects studies that lead to these possibilities and prepares the drafting of a turbo molecular pump manufacturer's test method to improve User's use of security.

The core content of this standard is the turbo molecular pump and composite molecular pump emergency stop torque test method.

The term "turbomolecular pump", as used in this standard, is generic and includes dragged molecular pumps and composite molecular pumps.

1 Scope

This standard specifies a test method for turbo-molecular pump emergency stop torque (breaking torque). This torque is produced by axial flow blades or spiral passages Health generated by the gas momentum. The main destructive force that causes the molecular pump to break is the torque centered on the rotor axis. Other may occur smaller Force and torque are not covered by this standard.

There are two kinds of damage in the form: broken pump rapid drop and rotor scrape drop, this standard applies. Turbine molecular pumps and drag the molecular pump can be made Use the same test method.

2 Normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this document. For undated references, the latest edition (including all modifications) applies to this document.

ISO 3529-2 Vacuum technology vocabulary - Part 2: Vacuum pumps and related terms (Vacuum technology - Vocabulary - Part 2: Vacuum pumps and related terms)

3 Terms and definitions

ISO 3529-2 and the following terms and definitions apply to this document.

3.1 Inlet flange

A turbine molecular pump inlet flange for connection and fixing to a vacuum vessel.

3.2 Rotor; rotating body; rotary parts

(Vacuum pump) assembly comprising a shaft, a rotor body and a rotor blade supported by a bearing and driven by a motor.

3.3 Rotor blade; turbine blade; rotating blade

(Vacuum pump) The rotating part of the pump has its peripheral speed close to the speed of sound, through the rotation to achieve vacuum exhaust, similar to axial flow turbine blades.

3.4 Rotor body; rotor cylinder part; rotor spiral groove part

(Vacuum pump) rotor part of the rotor blade in addition to the part.

3.5 Centrifugal destruction

Centrifugal force produced by splitting.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 21 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 3529-2

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