This standard specifies the product classification, product marking, technical requirements, inspection rules and marking, packaging, transportation and storage requirements of metal cooling fans for internal combustion engines. This standard applies to water-cooled and oil-cooled metal cooling fans for internal combustion engines with an outer diameter not exceeding 750mm. JB/T 6723.1-1993 Internal combustion engine cooling fans Part 1 Technical conditions for metal cooling fans JB/T6723.1-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 6723.1-1993
Cooling fans for internal combustion engines
Part 1 Technical conditions for metal cooling fans Issued on July 29, 1993
Ministry of Machinery Industry of the People's Republic of China
Implemented on January 1, 1994
Mechanical Industry Standard of the People's Republic of China
Cooling fans for internal combustion engines
Part 1 Technical conditions for metal cooling fans Subject content and scope of application
JB/T 6723.11993
This standard specifies the product classification, product marking, technical requirements, inspection rules and requirements for marking, packaging, transportation and storage of metal cooling fans for internal combustion engines.
This standard applies to water-cooled and oil-cooled metal cooling fans for internal combustion engines (hereinafter referred to as fans) with an outer diameter not exceeding 750mm. 2
Cited standards
GB1236
GB1801
GB/T 1804
GB2828
Test methods for aerodynamic performance of ventilators
Tolerances and fit dimensions to 500mm holes, shaft tolerance zones and fitsGeneral tolerancesUnspecified tolerances for linear dimensions
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)Product classification, product marking
The classification of fans is shown in Table 1 and Figures 1 to 4.
Classification and code of fans
Classification by structure
Classification by airflow direction
3.2 Product marking method
The product marking consists of the following parts:
3.2.2 Marking example
Integral blade fan
Single tray fan
Double tray fan
Forward fan
Reverse fan
Standard number
Airflow direction code
Location hole diameter, mm
Outer diameter, mm
Structural type code
Product Name
a.Metal fan, double support plate structure, outer diameter 480mm, positioning hole diameter 42mm, the airflow direction is positive type marked as metal fan FS480×42Z
JB/T6723.1—1993
Metal fan, integral blade,
outer diameter 280mm, positioning hole diameter 28mm, the airflow direction is reverse type marked as: b.
Metal fan FZ280×28F
Approved by the Ministry of Machinery Industry on 1993-07-29
JB/T 6723.1—1993
1994-01-01 implementation
JB/T 6723.11993
Figure 1 Integral blade fan
1—front blade; 2—rear blade
Figure 2 Single tray fan
1—tray; 2—blade
Direction of rotation
Direction of airflow
a Forward type fan
JB/T6723.1—1993
Double tray fan
1—front tray; 2—rear tray; 3 blades
Direction of rotation
Responsible party
b Reverse type fan
Figure 4 Classification by airflow direction
Technical requirements
JB/T 6723.11993
The fan shall comply with the requirements of this standard and be manufactured in accordance with the product drawings and technical documents approved by the prescribed procedures. The dimensions of the locating hole diameter and the center circle diameter of the bolt hole are shown in Table 2. Table 2
Location hole diameter
The dimensions of the fan outer diameter are shown in Table 3.
Fan outer diameter
Fan outer diameter
Dimensions in brackets should not be used as much as possible.
Location hole diameter and bolt hole center circle diameter (recommended dimensions)
Fan outer diameter
(recommended dimensions)
The dimension tolerance grade of the fan locating hole shall meet the H9 grade specified in GB1801. The position tolerance of the center of the fan bolt hole is 0.35mm. 7
The dimension tolerance grade of the fan outer diameter shall meet the h13 grade specified in GB/T1804. The installation angle deviation of the fan blade is ±1".
The center circle diameter of the bolt hole
The runout of the blades on the same side on the same diameter shall comply with the provisions of Table 4. When rotating based on the positioning hole and the fan installation plane, Table 4
Fan outer diameter
>350~550
>550~750
Fan blade runout
The fan assembly shall be subjected to static balance inspection, and its unbalance amount shall comply with the provisions of Table 5. Table 5
Fan outer diameter D
>400~500
>500~600
>600~750
Unbalance of fan assembly
Unbalance
4.10 No cracks are allowed on the fan surface. 4.11
1 The fan surface should be treated with rust prevention.
JB/T6723.11993
4.12 The aerodynamic performance of the fan should comply with the product drawings or relevant standards. The test method adopts the air intake method specified in GB1236. The diameter of the test wind circle should be 1.05 times the outer diameter of the fan (rounded), and the axial projection width of the fan blades should all be within the test wind circle. 4.13
3 The fan noise should comply with the product drawings or relevant standards. 4.14 The fan shall be subjected to an overspeed test, with the test speed being 1.5 times the rated speed and the running time being 1 minute. After the test, no defects such as cracks and loose rivets shall be found in any part.
5 Inspection rules
5.1 The fan shall be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped out of the factory. 5.2 Factory inspection
The fan shall be inspected in accordance with the provisions of 4.4 to 4.11 before it leaves the factory. 5.3 Type inspection
5.3.1 The manufacturer shall conduct a type inspection of the product once a year in accordance with the technical requirements specified in this standard. 5.3.2 The fan shall be tested in accordance with the provisions of 4.12 to 4.14. 5.4 Fans shall be delivered in batches. Delivery acceptance, delivery acceptance items are the same as factory tests. When the ordering unit conducts random inspection of product quality, it shall be carried out in accordance with the provisions of GB2828, using general inspection level II, and the qualified quality level AQL value shall be agreed upon by the supply and demand parties. 6 Marking, packaging, transportation, storage
6.1 Marking
6.1.1 The marking shall be clear, and the location, size and method of marking shall comply with the product drawings or technical documents. Each fan shall be marked with:
a. Manufacturer's name or trademark;
b. Product model;
c. Manufacturing date;
d. The letter "Q\" shall be printed on the non-installation surface of the fan. 6.1.3 When the fan leaves the factory, it shall be accompanied by a certificate signed and sealed by the manufacturer's quality inspection department and inspection personnel. The certificate shall indicate: a. Manufacturer's name;
b. Product name and model;
c. Inspection date.
6.2 PackagingWww.bzxZ.net
The same type of products should be packed in the packaging box, and the outside of the box should be marked with: a. Product name, model and quantity;
b. Manufacturer's name and address;
c. "Handle with care" or symbols.
6.2.2 The packaging box should be accompanied by a product certificate, instruction manual and packing list, and the outside of the packaging box should be marked with: a. Product name, model and quantity;
b. Manufacturer's name and address;
c. Gross weight, kg;
d. Receiving unit and address;
e. Date of manufacture;
JB/T6723.11993
f "Handle with care", "Moisture-proof" and other words or symbols. 6.3 Transportation
Products with good packaging should be allowed to be transported by any normal method. Storage
The fan should be placed in a ventilated and dry warehouse. Under normal storage conditions, the manufacturer should ensure that the fan will not rust within 12 months from the date of leaving the factory.
Additional Notes:
This standard was proposed and managed by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Shanghai Internal Combustion Engine Research Institute of the Ministry of Machinery Industry. The main drafter of this standard was Xu Qiasheng.
People's Republic of China
Mechanical Industry Standard
Internal Combustion Engine Cooling Fan
Part 1 Technical Conditions for Metal Cooling Fans JB/T 6723.11993
Published and distributed by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
Postal Code 100044)
Sheet 5/8
Format 880×1230
Number of words 12,000
First edition December 1993
First printing December 1993
Print run 1-500
Price 2.00 yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_19 /
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