GB/T 4975-2018 English PDF

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GB/T 4975-2018: Displacement compressors vocabulary -- General
Status: Valid

GB/T 4975: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4975-2018	359	Add to Cart	4 days	Displacement compressors vocabulary -- General	Valid
GB/T 4975-1995	599	Add to Cart	3 days	Displacement compressors vocabulary. General	Obsolete
GB 4975-1985	439	Add to Cart	4 days	Displacement compressors--Vocabulary	Obsolete

Similar standards

GB/T 13277.1   GB/T 4976   GB/T 19410   GB/T 4980   GB/T 4974   

Basic data

Standard ID: GB/T 4975-2018 (GB/T4975-2018)
Description (Translated English): Displacement compressors vocabulary -- General
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J72
Classification of International Standard: 23.140
Word Count Estimation: 18,136
Date of Issue: 2018-07-13
Date of Implementation: 2019-02-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 4975-2018: Displacement compressors vocabulary -- General

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Displacement compressors vocabulary--General ICS 23.140 J72 National Standards of People's Republic of China Replace GB/T 4975-1995 General terminology for positive displacement compressors (ISO 3857-1.1977, Compressors, pneumatictoolsand machines-Vocabulary-Part 1. General; ISO 3857-2. 1977, Compressors, pneumatictoolsandmachines-Vocabulary-Part 2.Compressors;MOD) Published on.2018-07-13 Implementation of.2019-02-01 State Market Supervisory Administration China National Standardization Administration issued

Content

Foreword I 1 Scope 1 2 General 1 3 temperature 2 4 pressure 2 5 flow 4 6 compression process and power 4 7 than can 5 8 efficiency 5 9 performance 6 10 symbols and units 6 Appendix A (informative) This standard and ISO 3857-1. 1977 and ISO 3857-2. 1977 chapter number comparison list 10 Index 12

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 4975-1995 "General Terminology for Positive Displacement Compressors". Compared with GB/T 4975-1995, the main technical changes in this standard are as follows. --- Removed the French equivalent and French index terminology in the term (see Chapter 2 ~ Chapter 9,.1995, Chapter 2 ~ Chapter 9) And Appendix C); --- The ideal volumetric flow rate of the compressor is modified to the theoretical volumetric flow rate of the compressor (see 2.2,.1995 edition 2.2); ---The standard inspiratory state and the standard exhaust state are changed to the standard inspiratory position state and the standard exhaust position state, respectively (see 2.7, 2.8, 1995 edition 2.7, 2.8); --- Removed the standard inhalation position, standard exhaust position, standard inspiratory state, inspiratory temperature, inspiratory pressure terminology The expression in (see 2.5, 2.6, 2.7, 3.6, 4.9,.1995 edition 2.5, 2.6, 2.7, 3.6, 4.9); ---Speed, mass ratio energy, volumetric specific energy (specific power) symbol increase N, em, ev (see Table 1,.1995 edition table D1); --- Increased the isentropic power, unit input specific power and isentropic efficiency terms commonly used at home and abroad (see 6.8, 7.3, 8.6); --- Added after the volumetric energy (specific power), and increased kW/(m3 · min-1) for other practical units (see Table 1,.1995 edition) Table D1); --- The contents of the symbols and units are moved from the appendix to the body (see Chapter 10, Appendix D of the.1995 edition); --- Added a checklist of this standard and ISO 3857-1.1977 and ISO 3857-2.1977 chapter number (see Appendix A). This standard uses the redrafting method to modify the use of ISO 3857-1.1977 "Compressors, pneumatic tools and mechanical terms. Part 1. General And ISO 3857-2. 1977 "Compressors, pneumatic tools and mechanical terms - Part 2. Compressors". This standard has more structural adjustments than ISO 3857-1.1977 and ISO 3857-2.1977. This standard is listed in Appendix A. A checklist of the number of chapters in ISO 3857-1.1977 and ISO 3857-2.1977. The technical differences between this standard and ISO 3857-1.1977 and ISO 3857-2.1977 and their reasons are as follows. --- Removed the tip Mach number, volume factor, power compressor interstage pressure coefficient, power type not applicable to positive displacement compressors Terms such as compressor full pressure coefficient and thermal balance of power compressor; --- Increased the isentropic power, unit input specific power and isentropic efficiency terms commonly used at home and abroad (see 6.8, 7.3, 8.6); --- Increased Celsius temperature, rotational speed, mass specific energy, volumetric specific energy (specific power), isentropic power, actual power, isentropic efficiency terminology No. t, N, em, ev, Pisen, Preal, ηisen (see Table 1). This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Compressor Standardization Technical Committee (SAC/TC145). This standard was drafted. Hefei General Machinery Research Institute, Hefei General Mechanical and Electrical Products Testing Institute Co., Ltd. The main drafters of this standard. Chen Xiangdong, Yu Zhiqiang. The previous versions of the standards replaced by this standard are. ---GB/T 4975-1995. General terminology for positive displacement compressors

1 Scope

This standard defines the terms, symbols and definitions or descriptions of positive displacement compressors (hereinafter referred to as compressors). This standard applies to all types of positive displacement compressors.

2 General

2.1 Compressor scavenging volume sweptvolumeofadisplacementcompressor The volume that the first stage compression element of the compressor is swept within one revolution. 2.2 Compressor theoretical volume flow displacementofadisplacementcompressor The volume that the compressor's first stage compression element sweeps per unit of time. 2.3 Clearance volume clearancevolume The volume of the compression chamber occupied by residual gas at the end of the compressor cycle. 2.4 Relative clearance volume relativeclearancevolume The ratio of the clearance volume of a certain stage to the scavenging volume of the compression element of the stage. 2.5 Standard inspiratory position standardinletpoint A typical suction position is considered on the compressor, which varies with the structure and installation of the compressor. Note 1. The standard suction position of a bare-packed compressor is generally at the first-stage intake flange or on the rotor casing. This position is generally used for inlet filtration for testing. After the device or muffler, unless otherwise specified. Note 2. If the manufacturer has no regulations, the standard suction position of the container compressor is at the position where the ambient gas enters the tank; or, for the non-closed box, the position is Allows the gas to first enter the spatial position of an attachment such as a gas filter. 2.6 Standard exhaust position standarddischargepoint A typical exhaust position is considered on the compressor, which varies with the compressor construction and installation. Note 1. The standard exhaust position of bare compressors is generally at the exhaust flange. --- Reciprocating compressor. used at the last stage (or only) exhaust flange or as required by the standard to reduce the flow of compressed gas The various chamber outlet flanges are pulsating and this position is described in the relevant documents. --- Swing compressor. The last (or only) rotor housing is at the exhaust flange. Note 2. The standard exhaust position of the manifold is at the terminal exit. 2.7 Standard inspiratory position state standardinletcondition The state of the suction gas at the standard suction position of the compressor. 2.8 Standard exhaust position status standarddischargecondition The state of the exhaust gas at the standard exhaust position of the compressor. ......

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