JB/T 6723.3-1993 Internal combustion engine cooling fan Part 3: Technical requirements for cooling fans of condensing internal combustion engines JB/T6723.3-1993 Standard download decompression password: www.bzxz.net

JB/T6723.3-1999
This standard is part of the JB/T6723 "Internal Combustion Engine Cooling Fan" series of standards, which includes the following four parts: 3 Internal Combustion Engine Cooling Fan Part 1: Technical Conditions for Metal Cooling Fans JB/T6723.1—1993
3 Internal Combustion Engine Cooling Fan Part 2: Technical Conditions for Plastic Cooling Fans JB/T6723.2—1993
9 Internal Combustion Engine Cooling Fan Part 3: Technical Conditions for Condensing Internal Combustion Engine Cooling Fans JB/T6723.3—1999
JB/T6723.4-1999
9 Internal Combustion Engine Cooling Fan Part 4: Test Methods for Condensing Internal Combustion Engine Cooling Fans
This standard is proposed and managed by the National Technical Committee for Standardization of Internal Combustion Engines. This standard was drafted by: Shanghai Internal Combustion Engine Research Institute, Changzhou Diesel Engine Factory Governor Branch. The main drafters of this standard are: Jin Ruikang, Xu Yanping, Zhou Feng, Jia Zhensheng, Jiang Nanqin, Liu Xinglong. 1
Machinery Industry Standard of the People's Republic of China
Cooling fan for internal combustion engines
Part 3: Technical conditions for cooling fan of condensing internal combustion engines
Cooling fan for internal combustion engines Part 3: Specifications for cooling fan of condensing engines 1 Scope
JB/T6723.3-1999
This standard specifies the classification, naming, technical requirements, inspection rules, marking, packaging and storage of cooling fans for condensing internal combustion engines. This standard applies to cooling fans of condensing internal combustion engines with and without generators (hereinafter referred to as fans). 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T699—1988
GB/T700—1988
GB/T1173—1995
GB/T2828—1987
GB/T4942.1—1985||t t||GB/T5212—1985
GB/T9439—1988
GB/T15115—1994
JB/T6723.41999
3 Classification and nomenclature
Technical conditions for high-quality carbon structural steel
Carbon structural steel
Casting aluminum alloys
Counting sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) Protection classification of motor housings
Hot-rolled silicon steel sheets for electrical use
Grey cast iron parts
Die-casting aluminum alloys
Cooling fans for internal combustion engines Part 4: Condensing type The test method for cooling fans of internal combustion engines is divided into two categories according to product structure and function: fan generator and cooling fan (without generator). 3.1
3.2 Products are named according to the following provisions:wwW.bzxz.Net
Product standard code: JB/T6723.3-1999Variant code: Indicated by A, B, C (basic type without mark)Rated output power of generator, W (in 2~3 digits)Basic outer diameter of impeller, cm (in two digits)Product type: FF for fan generator and F for cooling fanApproved by the State Bureau of Machinery Industry on September 17, 19992
Implementation on January 1, 2000
3. 3 Marking examples
JB/T6723.3—1999
a) The basic fan generator with an impeller basic outer diameter of 180mm and a rated output power of 40W is marked as: FF18-40JB/T6723.3-1999
b) The cooling fan with an impeller basic outer diameter of 140mm and a variant code of B is marked as: F14BJB/T6723.3—1999
4 Technical requirements
4.1 Fan products shall comply with the requirements of this standard and be manufactured in accordance with product drawings and technical documents approved through prescribed procedures. 4.2 The fan product series shall comply with the provisions of Table 1. Table 1
Product series and basic performance
Impeller basic outer diameter D2
Rated speed nb
Rated air volume Q,
Static pressure Pat
Static pressure efficiency nst
Noise level L, (A)
Matching engine 12h power (reference value)
≥360
≥450
≥470
The right side of the black line contains generator types
The fan should be driven by a V-belt, and its rotation direction should be counterclockwise from the drive end. 4.4 Materials
The materials and mechanical properties of the main parts of the fan should comply with the provisions of Table 2. 4.4.1
In addition to the above materials, other materials can also be used if they can meet the performance requirements specified in this standard. 11
Parts Name
Fan Seat
Fan Shaft
V-Pulley
Stator Plate
Bearing Seat
4.5 Manufacturing and Appearance
JB/T6723.3--1999
Table 2 Main Parts Materials
ZL101, ZL102
08, 08F
DR510-50||tt| |08，08F
Performance requirements
According to GB/T1173
According to GB/T15115
According to GB/T699
According to GB/T699
According to GB/T9439
According to GB/T700
According to GB/T5212
According to GB/T699
4.5.1 The impeller components shall be statically balanced. The allowable unbalance and the weight-removing parts during balance correction shall be in accordance with the product drawings. The bearings shall have protective devices and the bearing space shall maintain an appropriate amount of grease. 4.5.2
4.5.3 The outer surface of the fan shall be smooth and clean without obvious damage or defects; the coating shall be free of rust, peeling and flaking; the paint layer shall be uniform, complete and firm without bubbles, accumulation and flow marks.
4.5.4 The dimensions, shape and position of the appearance and installation parts (including the parts related to the matching condensing radiator) shall comply with the requirements of the product drawings.
4.5.5 The parts shall be correctly positioned without missing parts; the fastening shall be reliable; the impeller shall rotate flexibly without contact, friction, blockage, etc. 4.5.6 The axial movement of the fan shaft shall be less than 0.2mm. 4.5.7 There shall be no abnormal noise during operation.
Performance in use
The fan performance shall comply with the requirements of Table 1.
For the fan generator, it shall also comply with the provisions of 4.6.3~4.6.11. The generator adopts the maximum continuous rated working system. The protection level of the generator shall be in accordance with IPX3 in GB/T4942.1. The insulation of the generator winding shall not be lower than Class B.
The rated voltage and cold working performance of the generator shall comply with the requirements of Table 3. The temperature rise limit of the generator is 60℃.
The insulation between the live conductor and the non-live conductor of the fan generator shall not be broken down after the 550V withstand voltage test. After the following tests, there shall be no damage to the parts and loose fasteners of the fan generator, and the cold working performance shall still meet the requirements of Table 3: a) Overspeed test of 1.2 times the rated speed;
b) 10° vibration test.
4.6.10 After the following tests, the appearance quality of the fan generator shall be intact, and the cold working performance shall still meet the requirements of Table 3: a) High temperature test of 85℃;
b) Temperature change test of -10℃ and +85℃. 4.6.11 After the 3000h endurance test, the reduction rate of the rated output power of the fan generator shall not exceed 5%. 4
1) n-rated speed.
JB/T6723.3-1999
Table 3 Cold working performance of generator
Terminal voltage
Lighting type
2) nmi minimum working speed, nmi=0.5npo3) nmax-maximum working speed, nmax1.1npe4) It should reach 9V after taking other technical measures. 5) P-rated output power.
4.7 Warranty period
Rechargeable type
Output power
If the user selects the model reasonably and abides by the manufacturer's storage, installation and use rules, the manufacturer shall repair or replace the fan free of charge within 18 months from the date of leaving the factory (within 3000h of cumulative working time) if it cannot work normally. Inspection method
According to JB/T6723.4 regulations.
Inspection rules
6.1 Fans must be inspected and qualified by the quality inspection department of the manufacturer before leaving the factory. 6.2 Factory inspection
Fans should be inspected according to the requirements of 4.5.3~4.5.7 before leaving the factory, and fan generators should also be inspected according to the requirements of 4.6.6 and 4.6.8.
6.3 Type inspection
The manufacturer should conduct type inspection of the product at least once every two years in accordance with the technical requirements specified in this standard. 6.4 When fans are delivered and accepted in batches, the inspection items are the same as the factory inspection. When the ordering unit conducts random inspection of product quality, it should be carried out in accordance with the provisions of GB/T2828.
7 Marking, packaging, storage
7.1 Each fan should be marked in an obvious position: a) product name, model;
b) rated speed, rated voltage and rated output power; c) factory number;
d) manufacturing date;
e) manufacturer's name and trademark.
The marking should be clear and reliable; the marking position, size and method should comply with the product drawings or technical documents. 7.2 The fan should be accompanied by a certificate signed by the inspection personnel of the manufacturer's quality inspection department when it leaves the factory. 7.3 The fans should be placed in a certain number, safely and reliably in cardboard boxes or wooden boxes. The products should not move in the box to ensure that they will not be lost or damaged during normal transportation. 6723.3—1999
7.4 The total weight of the packing box should not exceed 25kg. The box should be accompanied by the product manual and packing list. The fans in each packing box should be of the same model. The outside of the packing box should be marked with: a) Product name and model:
b) Manufacturer name and address:
c) Quantity;
d) Gross weight;
e) "Handle with care", "Moisture-proof" and other signs. 5 Fans should be stored in a ventilated and dry warehouse. 7.5
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