JB/T 50198-2000 Product Quality Classification for Cooling Fans of Condensing Internal Combustion Engines JB/T50198-2000 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T50198-2000
Condensing Internal Combustion Engine Cooling Fan
Product Quality Classification
(Internal Use)
Published on 2000-08-31
National Machinery Industry Bureau
Implemented on 2000-12-01
JB/T50198—2000
This standard is compiled based on the relevant provisions of JB/T6723.3~6723.41999 "Internal Combustion Engine Cooling Fan" and the test analysis and summary of relevant samples at home and abroad.
This standard is proposed and managed by the National Technical Committee for Standardization of Internal Combustion Engines. Drafting units of this standard: 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. This standard was first issued in August 2000.
1 Scope
Machinery Industry Standard of the People's Republic of China
Cooling Fans for Condensing Internal Combustion Engines
Product Quality Grading
(Internal Use)
JB/T50198—2000
This standard specifies the quality indicators, test methods and inspection rules for the three grades of qualified products, first-class products and superior products of two types of cooling fans with and without generators for condensing internal combustion engines (hereinafter referred to as fans). This standard is applicable to the assessment of the quality grade of fan products. 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/T2828——1987
JB/T6723.3—1999
JB/T6723.4—1999
3 Quality indicators
Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection) Internal combustion engine cooling fans Part 3: Technical conditions for condensing internal combustion engine cooling fans Internal combustion engine cooling fans Part 4: Test methods for condensing internal combustion engine cooling fans 3.1 Fan products should be manufactured according to product drawings and technical documents approved by the prescribed procedures and comply with the provisions of relevant standards. 3.2 Fan products are divided into two types: fan generators and cooling fans (without generators). According to the different requirements of their quality indicators, they are divided into three grades: qualified products, first-class products and superior products. 3.3 The quality indicators of fan products are classified according to the provisions of Table 1, among which the cooling fan inspection items only include 1 to 12 items, and the fan generator includes 1 to 21 items.
Table 1 Classification of quality indicators
Test items
Static pressure pa at rated speed np and rated air volume O, Static pressure at rated speed n and rated air volume Q Efficiency n Noise Lp(A) at rated air volume 9.
Bearing protection
Appearance quality
Plating and paint layer
Qualified products approved by the State Machinery Industry Bureau on 2000-08-31
Quality characteristics
According to the provisions of Table 2
According to the provisions of Table 3
According to the provisions of Table 4
Protective devices should be provided
Superior products
The surface should be smooth and clean, without obvious damage or defects. The plating layer should not be rusted, peeled or flaked; the paint layer should be uniform and complete, without bubbles, accumulation or flow marks
2000-1 2-01 Implementation
Overall dimensions
Test items
Dimensions and shape and position requirements of installation parts
Assembly quality
Axial movement
Product mark
Rated output power P of generator
Terminal voltage at minimum and maximum operating speeds Overspeed test
Vibration test
Temperature rise of generator
Withstand voltage test
High temperature test
Temperature change test
Protection level
JB/T50198—2000
Table 1 (end)
Qualified products
Quality characteristics
Meet the requirements of the drawings
Superior products
Components are correctly positioned, securely fastened, and there are no missing parts. The impeller runs flexibly, without friction or blocking, and there is no abnormal noise during operation≤0.20
Conforms to 7.1 of JB/T6723.3-1999Conforms to 7.3 of JB/T67233-1999Conforms to Table 3 of JB/T6723.31999
Conforms to Table 3 of JBT67233
-1999
No parts are damaged and fasteners are loose. The cold working performance of the generator still conforms to Table 3 of JB/T6723.3-1999
The appearance quality is intact. The cold working performance of the generator still complies with the provisions of Table 3 in JBT67233-1999. The minimum working speed is not less than 9V, and the maximum working speed complies with the provisions of Table 3 in JB/T6723.3-1999. There is no damage to parts and loose fasteners. The terminal voltage is not less than 9V at the minimum working speed of the generator, and the other cold working performances still comply with the provisions of Table 3 in JBT6723.3-1999. The insulation is not broken down. The appearance quality is intact. The terminal voltage is not less than 9V when the generator is at its lowest operating speed, and the other cold working performances still comply with the provisions of Table 3 in JBT6723.3-1999. The rated fan speed m and rated air volume 9 shall comply with the provisions of Table 1 in JB/T6723.3-1999. 2 During the electrical performance test: minimum operating speed nmin=05ng, maximum operating speed nmax=1.1ng2
Impeller outer diameter D
Impeller outer diameter D2
Impeller outer diameter D2
JB/T50198—2000
Qualified products
≥320
≥360
≥400
≥420
≥450
≥470
≥490
Classification of fan static pressure
Static pressure pstPa at rated speed nmb and rated air volume Q
≥335
≥380
≥420www.bzxz.net
≥ 440
≥ 470
≥495
≥515
Table 3 Classification of fan static pressure efficiency
Superior product
≥350
≥400
≥440
≥460
≥500
≥520
≥540
Static pressure efficiency at rated air volume 97st
Rated speed,
Qualified product
≥ 22
Table 4 Classification of fan noise
Noise level at nominal air volume α, (A)
Qualified products
Superior products
Superior products
4 Test methods
JB/T50198—2000
After assembly, the test of "abnormal noise during operation" should be carried out at the nominal speed. The test of fan static pressure and static pressure efficiency shall be carried out in accordance with the provisions of Chapter 4 of JB/T6723.4-1999. The test of fan noise shall be carried out in accordance with the provisions of Chapter 5 of JB/T6723.4-1999. 4.4 The test of cold performance of the generator, overspeed test, vibration test, temperature rise test, voltage withstand test, high temperature test, temperature change test and protection level test shall be carried out in accordance with the provisions of 6.1 to 6.8 of JB/T6723.4-1999 respectively. When the speed specified in the fan generator drawing deviates from Table 1 in JB/T6723.3-1999, the cold working performance is allowed to be inspected according to the speed specified in the drawing.
5 Inspection rules
The classification of unqualified inspection items shall be in accordance with the provisions of Table 5. Table 5 Unqualified inspection items
Unqualified classification
Inspection items
Calibrated air volume 9,Noise level (A) at nominal speed (tt)
Overspeed test
Static pressure at nominal speed (nmb) and nominal air volume (O); Static pressure at nominal speed (p) and nominal air volume (O); Efficiency ratio. Requirements on installation part dimensions and shape and position
Rated output power P of generator
Terminal voltage at minimum and maximum operating speedWithstand voltage test
Vibration test
Temperature rise of generator
Bearing protection
Appearance quality
Plating and paint layer
Overall dimensions
Assembly quality
Axial movement
Product marking
High temperature test
Temperature change test
Protection level
5.1.2 Acceptable quality level AQL
JB/T50198—2000
For the fan generator and cooling fan, this product specifies the AQL values ​​of qualified products, first-class products and superior products, which are listed in Table 6 and Table 7.
Sampling plan for fan generator
Unqualified classification
Inspection level
Sample size code
Sample size
Qualified products
First-class products
Superior products
Unqualified classification
Inspection level
Sample size code
Sample size
Qualified products
First-class products
Superior products
5.1.3 Inspection level IⅡL
Special inspection level is adopted.
5.1.4 Inspection batch
Sampling plan for cooling fan
N=91~150
N=91~150
The inspection batch N is specified to be 91150. When the inspection batch is less than the lower limit of the specified value, the sampling plan shall still be in accordance with Table 6 and Table 7; When
the inspection batch is greater than the upper limit of the specified value, the product shall be divided into several batches according to the upper limit of the specified value, and one of the batches shall be randomly selected for sampling inspection. 5.1.5 Sampling plan type
Use the normal inspection one-time sampling plan.
5.1.6 Sample size code and sampling plan
JB/T50198—2000
According to GB/T2828, the sample size code and sampling plan for fan generators and cooling fans are respectively specified and listed in Table 6 and Table 7. 5.2 Implementation of the sampling plan
The samples shall be drawn from the finished product warehouse of the manufacturer (if necessary, they can also be drawn from the supporting factory or supplier). Sampling must be carried out suddenly and randomly. The number of samples drawn is 6 units.
5.3 Evaluation of product quality grade
5.3.1 Inspection of samples
For fan generators and cooling fan samples, the inspection shall be carried out according to the test items, quality indicators, unqualified classification, sampling plan and test methods specified in Table 1, Table 5, Table 6 and Table 7 respectively, and Chapter 4. 5.3.2 After the samples are inspected according to the specified number, if the number of unqualified products in a certain category in the samples is less than or equal to Ac, the category is judged as qualified, otherwise it is judged as unqualified. The inspection conclusions shall be made according to the sampling plan of each type of unqualified products, and the qualified or unqualified shall be determined. When all categories are judged as qualified, the whole batch of products can be finally judged as qualified. When any category is judged as unqualified, the whole batch of products will be finally judged as unqualified. 5.3.3 Assessment of quality grade
5.3.3.1 After the samples are inspected according to the specified number, when the number of each type of unqualified products in the samples is less than or equal to Ac of the superior product, the inspected product is assessed as a superior product: when the number of each type of unqualified products in the samples is less than or equal to Ac of the first-class product, the inspected product is assessed as a first-class product; when the number of each type of unqualified products in the samples is less than or equal to Ac of the qualified product, the inspected product is assessed as a qualified product. When the number of unqualified products in one category in the sample is greater than Ac of the qualified product, the inspected product is assessed as an unqualified product. 5.3.3.2 If a product is assessed as an unqualified product, it is allowed to be re-inspected once after half a year. If the re-inspection is qualified, it can still be assessed as a qualified product, but it cannot be assessed as a first-class product or a superior product.
Mechanical Industry Standard
Condensing Internal Combustion Engine Cooling Fan
Product Quality Grading
(Internal Use)
JB/T50198-2000
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)*
1/16 Sheet 3 /4Word count: 14,000
Format: 880×1230
First edition: November 2000
Print run: 1-500
First printing: November 2000
Price: 1,500 yuan
No.: 2000-153
Mechanical Industry Standards Service Network: http/kvwwJB.ac.cn00860000
Format 880×1230
First edition in November 2000
Print run 1-500
First printing in November 2000
Price 1500 yuan
No. 2000-153
Mechanical Industry Standard Service Network: http/kvwwJB.ac.cn00860000
Format 880×1230
First edition in November 2000
Print run 1-500
First printing in November 2000
Price 1500 yuan
No. 2000-153
Mechanical Industry Standard Service Network: http/kvwwJB.ac.cn00860
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