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JB/T 6723.2-2014 PDF in English


JB/T 6723.2-2014 (JB/T6723.2-2014, JBT 6723.2-2014, JBT6723.2-2014)
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JB/T 6723.2-2014English160 Add to Cart 0-9 seconds. Auto-delivery. Cooling fan for internal combustion engines. Part 2: Plastic fans. Specification Valid

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Standards related to: JB/T 6723.2-2014

JB/T 6723.2-2014: PDF in English (JBT 6723.2-2014)

JB/T 6723.2-2014
JB
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 27.020
J 96
Record No.: 45823-2014
Replacing JB/T 6723.2-2008
Cooling Fan for Internal Combustion Engines -
Part 2: Plastic Fans - Specification
ISSUED ON: MAY 06, 2014
IMPLEMENTED ON: OCTOBER 01, 2014
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Classification, Code, Model and Specification ... 6
4 Technical Requirements ... 7
5 Inspection Methods ... 11
6 Inspection Rules ... 15
7 Marking, Packaging, Transportation and Storage ... 15
Cooling Fan for Internal Combustion Engines -
Part 2: Plastic Fans – Specification
1 Scope
This Part of JB/T 6723 specifies the product classification, code, product model
specification marking method, technical requirements, inspection methods, inspection
rules, marking, packaging, transportation and storage for the plastic cooling fans of the
internal combustion engine.
This Part is applicable to plastic cooling fan assemblies (hereinafter referred to as fans)
for cooling systems of water-cooled and air-cooled internal combustion engines
(gasoline and diesel engines) with an outer diameter of no more than φ1000mm.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) is applicable to this document.
GB/T 1033.1-2008 Plastics - Methods for Determining the Density of Non-Cellular
Plastics - Part 1: Immersion Method, Liquid Pycnometer Method and Titration
Method
GB/T 1040.2-2006 Plastics – Determination of Tensile Properties - Part 2: Test
Conditions for Molding and Extrusion Plastics
GB/T 1043.1-2008 Plastics - Determination of Charpy Impact Properties - Part 1:
Non - Instrumented Impact Test
GB/T 1236-2000 Industrial Fans - Performance Testing Using Standardized Airways
GB/T 1634.2-2004 Plastics - Determination of Temperature of Deflection Under
Load - Part 2: Plastics, Ebonite and Long-Fiber-Reinforced Composites
GB/T 1801-2009 Geometrical Product Specifications (GPS) - Limits and Fits -
Selection of Tolerance Zones and Fits
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attribute – Part 1:
Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-Lot
Inspection
The noise performance of the fan shall comply with the provisions of the product
drawings or technical documents.
4.10 Reliable performance
4.10.1 Overspeed resistant reliability
In a normal temperature environment, after the fan is operated at 1.5 times the rated
speed for 2min, no defects such as cracks or looseness, etc. shall appear in all parts.
4.10.2 Reliability of resistance to cold and heat alternating
After the fan undergoes the test for reliability of resistance to cold and heat alternating
specified in 5.9.3:
a) The axial circular runout of the axial blades on the same side of the fan shall
comply with the provisions of Table 5;
b) The radial extension of the outer edge of the fan shall not exceed 0.5% of its
outer diameter;
c) The decrease in air volume shall be no greater than 8.0% of the fan air volume
before the test;
d) There must be no defects such as cracks or looseness, etc. in all parts of the fan.
4.10.3 Reliability of resistance to low temperature
When the airflow temperature is -35°C±2°C, the fan runs continuously at the rated
speed for 30min, and there shall be no defects such as cracks or looseness, etc. in all
parts of the fan.
5 Inspection Methods
5.1 Physical and chemical properties of fan blade materials
5.1.1 Pretreatment of specimen
Various specimens of fan blade materials for inspection of physical and chemical
properties shall be adjusted conditions for more than 12h at an ambient temperature
of 23°C±2°C and a relative humidity of 40 ~60% in accordance with the provisions of
GB/T 2918-1998.
5.1.2 Density
Perform according to the provisions of Method A in GB/T 1033.1-2008.
carried out with a position plug gauge.
5.3 Shape and position tolerance
5.3.1 The inspection for the position tolerance of the center circle of the fan bolt hole
shall be carried out with a position plug gauge.
5.3.2 The inspection for the installation angle deviation of the fan blade shall be carried
out by a Vernier angle ruler.
5.3.3 The inspection for the axial circular runout on the same side of the fan shall be
inspected with a yaw checker.
5.4 Static balance
The inspection for the static balance of the fan shall be carried out on the balance test
bench.
5.5 Appearance
The inspection for the appearance of the fan adopts visual inspection and hand feeling
methods.
5.6 Metal accessories
5.6.1 The test for the electroplating layer thickness of the metal accessory of the fan
shall be carried out according to the provisions of GB/T 4956-2003. The test location
shall be the large and flat area of the metal accessory. Take more than 5 points in the
circumferential direction and take the average as the results.
5.6.2 The test for corrosion resistance of the electroplated layer of the metal
accessories of the fan shall be carried out according to the neutral salt spray (NSS)
test method specified in GB/T 10125-1997.
5.7 Aerodynamic performance
5.7.1 The test method for the aerodynamic performance of the fan adopts the air intake
method specified in GB/T 1236-2000.
5.7.2 The test equipment adopts Type-C device (test pipeline on the inlet side).
5.7.3 The diameter of the test wind ring shall be 1.05 times of the outer diameter of the
fan (take an integer); and the axial projection width of the fan blades shall be all within
the test wind ring.
5.8 Noise performance
5.8.1 The test method for noise of the fan is carried out according to the provisions of
7.1.1 Each fan shall be marked with:
a) The name and trademark of the manufacturer;
b) Product model.
The mark shall be clear and permanent; the location of the mark shall be on the side
of the non-installation plane; and the size and method shall comply with the provisions
of the product drawings or technical documents.
7.1.2 The fan shall be accompanied by a certificate signed by the manufacturer’s
quality department and the inspector. The certificate shall indicate:
a) The name of the manufacturer;
b) Product name and model;
c) Date of inspection.
7.2 Packaging
7.2.1 After the exit-factory fan has passed the inspection, put it into the packaging box.
7.2.2 The packaging box is a double-corrugated paper box; and the appearance color
is the color of double-corrugated paper. The product instruction manual and packing
list shall be attached inside. The outside of the packaging box shall be marked:
a) Product name, model, quantity and implementation standard number;
b) The name and address of the manufacturer;
c) Gross weight, in kilograms (kg);
d) Receiving organization and address;
e) Date of delivery;
f) "Handle with care", "Do not press heavily", "Moisture-proof" and other words or
symbols.
7.3 Transportation
The completely-packaged products shall be allowed to be transported by any normal
method.
7.4 Storage
The fan shall be stored in a ventilated and dry warehouse; away from fire; and avoid
contact with acid and alkali. Under normal storage conditions, the manufacturer shall
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.