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QC/T 1172-2022Performance requirements and bench test methods for exhaust silencers of automotive air braking components (English PDF)

汽车气压制动部件用排气消音器性能要求及台架试验方法

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

April 8, 2022

Implementation date

October 1, 2022

Scope

QC/T 1172-2022 is the English-translated version of 汽车气压制动部件用排气消音器性能要求及台架试验方法.

QC/T 1172-2022 covers the exhaust muffler fitted to the air brake components of a commercial vehicle - relay valves, brake valves, trailer control valves and air dryers - and sets what such a muffler has to achieve and how it is measured on a bench.

It fixes the performance requirements: the insertion loss that gives the noise reduction, the exhaust time hysteresis ratio that shows how much the muffler slows the release of air, the working durability after cycling, and the waterproof behaviour of mufflers that claim it.

It also fixes the test conditions: a class 0.5 instrument accuracy for performance and 1.5 for durability, a Type I sound level meter to GB/T 3785.1-2010, an auxiliary pipeline of no more than 0.15 L per circuit, and the test circuits and measurement points used with each kind of valve.

Issued by the Ministry of Industry and Information Technology on 8 April 2022, it has applied since 1 October 2022.

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Document preview — QC/T 1172-2022

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword6
Introduction7
1 Scope8
2 Normative references8
3 Terms and definitions8
4 Performance requirements10
5 Test requirements11
6 Test method12

1 Scope

This document specifies the terms and definitions, performance requirements, test- related requirements, test methods, of the exhaust muffler (hereinafter referred to as muffler), which is used on the vehicle air brake unit.

This document is applicable to the use of automobile air brake components (such as:

relay valve, brake valve, trailer control valve, air dryer, etc.), which are used on the vehicle air brake unit.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to the date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 3785.1-2010 Electroacoustics - Sound level meters - Part 1: Specifications

GB/T 5620 Road vehicles - Vocabulary and definition for braking of automotive vehicles and their trailers

QC/T 35-2015 Automobile and trailer - Specifications and bench test methods of pressure control equipment

QC/T 996-2015 Specifications and bench test methods of automobile air dryer

3 Terms and definitions

The terms and definitions, as defined in GB/T 5620, as well as the following terms and definitions, apply to this document.

4 Performance requirements

4.4 Waterproof performance (only applicable to mufflers with waterproof function)

4.4.1 Carry out the test according to 6.4.1. There shall be no water infiltration at the exhaust port of the valve body.

4.4.2 Carry out the test according to 6.4.2. There shall be no water infiltration at the exhaust port of the valve body.

4.3 Working durability

After the test according to 6.3, the muffler shall not be damaged; the insertion loss shall meet the requirements in Table 1.

5 Test requirements

5.1 Test device

5.1.1 The equipment used in the test shall meet the requirements of the test conditions of the relevant items. It shall not adversely affect the function of the test sample. The accuracy grade of the instruments or meters, which are used to record various parameters in the performance test, shall not be lower than 0.5. The accuracy grade of the instruments or meters, which are used to measure and record the parameters in the durability test, shall not be lower than 1.5.

5.1.2 Unless otherwise specified, all tests shall be carried out, by installing the muffler sample on the exhaust port of the matching valve, according to the requirements of the product technical documents. The total volume of the auxiliary pipeline, in a single test circuit, shall not exceed 0.15 L.

5.1.3 The sound level meter or other equivalent measuring system, which is used for measurement, shall not be lower than the requirements of Type I sound level meter, which is specified in GB/T 3785.1-2010.

5.2 Test sample

Unless otherwise specified, all samples shall complete all corresponding tests, according to Table 2. For mufflers, that can be installed on a variety of valve bodies, the device needs to be matched with each valve body, for testing.

6 Test method

6.1.4.3 Open the pressure regulating valve 2. Fill the air cylinder 3 with compressed air, which is 200 kPa higher than the unloading pressure. Stabilize the pressure for 3 minutes.

6.1.4.4 Open the speed regulating valve 4. Feed compressed air into the air dryer, at a flow rate of 455 L/min ~ 510 L/min. When the pressure on the pressure gauge 6 reaches unloading and begins to drop, until the air dryer recovers pressure, record the peak noise value, which is measured by the sound level meter.

6.1.4.5 Take the arithmetic mean LP2 of the three position measurement values.

6.1.4.6 Remove the muffler from the air dryer. Keep the other devices in the same position. Carry out the test according to 6.1.4.3 ~ 6.1.4.5. Record LP1.

6.2 Exhaust time hysteresis ratio

6.2.1 Muffler matching the relay valve

6.2.1.1 Carry out the test according to 6.1.1.1 ~ 6.1.1.4. Record the relationship curve of the pressure gauge 7 with time. Calculate the exhaust time tE1.

6.2.1.2 Remove the muffler from the relay valve. Carry out the test, according to 6.1.1.1 ~ 6.1.1.4. Record the relationship curve of the air pressure value, which is displayed on the pressure gauge 7 with time. Calculate the exhaust time tE2, according to the curve.

6.2.1.3 Calculate the exhaust time hysteresis ratio, according to formula (2).

6.2.2 Muffler matching the brake valve

6.2.2.1 Carry out the test according to 6.1.2.1 ~ 6.1.2.4. Record the relationship curve of change of pressure gauge 9's indication value with time. Calculate the exhaust time tE1.

6.2.2.2 Remove the muffler from the brake valve. Carry out the test according to 6.1.2.1 ~ 6.1.2.4. Record the relationship curve of the change of pressure gauge 9's indication value with time. Calculate the exhaust time tE2.

6.2.2.3 Calculate the exhaust time hysteresis ratio, according to formula (2).

6.2.3 Muffler matching the trailer control valve

6.2.3.1 Carry out the test according to 6.1.3.1 ~ 6.1.3.4. Record the relationship curve of change of pressure gauge 6's indication value with time. Calculate the exhaust time tE1.

6.2.3.2 Remove the muffler from the trailer control valve. Carry out the test according to 6.1.3.1 ~ 6.1.3.4. Record the relationship curve of the change of pressure gauge 6's indication value with time. Calculate the exhaust time tE2.

6.2.3.3 Calculate the exhaust time hysteresis ratio, according to formula (2).

6.3 Working durability

6.3.1 For the muffler matching with the relay valve, install the muffler to the relay valve.

Conduct the test according to 6.2.7, which is specified in QC/T 35-2015. After the test, check whether the muffler is damaged. Retest the insertion loss, according to 6.1.1.

6.3.2 For the muffler matching the brake valve, install the muffler to the brake valve.

Conduct the test according to 6.1.7, which is specified in QC/T 35-2015. After the test, check whether the muffler is damaged. Retest the insertion loss, according to 6.1.2.

6.3.3 For the muffler matching with the trailer control valve, install the muffler on the trailer control valve. Conduct the test according to 6.4.7, which is specified in QC/T 35-2015. After the test, check whether the muffler is damaged. Retest the insertion loss, according to 6.1.3.

6.3.4 For the muffler matching with the air dryer, install the muffler on the air dryer.

Carry out the test according to 7.12, which is specified in QC/T 996-2015. After the test, check whether the muffler is damaged. Retest the insertion loss according to 6.1.4.

6.4 Waterproof performance

6.4.1 Static waterproof performance

6.4.1.1 See Figure 6 for the schematic diagram of the test device.

6.4.1.2 Install the muffler on the matching valve body. Seal all the ports of the valve body. Then immerse it in a container, which is filled with water as shown in Figure 6.

The lowest point of the muffler is 1.2 m away from the water surface. The included angle between axis and vertical direction is 15°.

6.4.1.3 After standing still for 15 minutes, take the sample to be tested out of the container. Then remove the muffler. Check whether there is water infiltration, at the exhaust port of the valve body.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 22 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

QC/T 1197-2023|QC/T 1168-2022|QC/T 291-2023|GB/T 43073-2023|GB/T 33928-2017|GB/T 24658-2009

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