Some standard content:
JB/T 89401999
Appendix A and Appendix B of this standard are both appendices of the standard. This standard is proposed and managed by the National Technical Committee for Standardization of Fans. The main drafting unit of this standard: Shenyang Blower Research Institute. The main drafters of this standard: Peng Xiuman and Chen Mingliang. 370
1 Scope
Machinery Industry Standard of the People's Republic of China
Working out method for fan product model
Working out method for fan product model This standard specifies the working out method for fan product model. This standard applies to centrifugal and axial flow fans. 2 Referenced standards
JB/T 8940--1999
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 version of the following standards. GB/T3235-1999 Basic forms, dimensional parameters and performance curves of fans JB/T2977-1992 Terminology of fans and Roots blowers 3 Methods for compiling fan product models
3.1 The models of centrifugal fan series products are generally expressed by type, and the models of single products are expressed by type and specification. The order of model composition is shown in Table 1.
0-0 x0(-
-Design serial number
--Specific speed
Impeller stage
Total pressure coefficient is enlarged by 5 times and rounded to an integer
Purpose code is in accordance with the provisions of Table A1 in Appendix A (Appendix to the standard). No.
-Machine number
Total pressure coefficient is enlarged by 5 times and rounded to an integer, generally using a single integer. When the total pressure coefficient of an individual forward impeller is greater than 1.0, it can also be expressed as a two-digit integer. The concept of total pressure coefficient is shown in JB/T2977 . The number of impeller stages is represented by a positive integer. Single-stage impellers are not marked. If two impellers are connected in parallel, or a single impeller has a double suction structure, it is represented by 2. 4
The specific speed is represented by a two-digit integer. The concept of specific speed is shown in Appendix B (Appendix to the standard). If there are repeated codes or prototypes in the product type, the font size is added after the specific speed, and it is represented by Roman numerals, etc. The design serial number is represented by Arabic numerals "1", "2", etc. It is used when there are major modifications to this type of product. If performance parameters, appearance When the dimensions, foundation dimensions, and wearing parts are not changed, the design serial number should not be used. The machine number is indicated by the impeller diameter (mm)/100 and is prefixed with the symbol \No\ (see GB/T3235). Approved by the State Bureau of Machinery Industry on July 12, 1999 and implemented on January 1, 2000
3.2 Examples of centrifugal fan model representation are shown in Table 2. Serial number
(General) centrifugal fan
(General) centrifugal fan
Mine centrifugal fan|| tt||Explosion-proof centrifugal fan
(General) centrifugal fan
Boiler centrifugal fan
Boiler centrifugal induced draft fan
(Avoidance) centrifugal fan
Air conditioning centrifugal fan
Air conditioning centrifugal fan
4-2×72
K4-2X72
4-72-1
KT11-74
KT11-2×74
JB/T 8940 ---1999
For general ventilation, the total pressure coefficient is 0.8, the specific speed is 72, the machine number is 20, that is, the impeller diameter is 2000mm.
The impeller is a double-suction type, the specific speed is twice that of a single impeller, and the other parameters are the same as Article 1.
For mine main fan ventilation, other parameters are the same as Article 2. For explosion-proof ventilation, other parameters are the same as Article 1. Another type (series) of product that is the same as 4-72. Other parameters are the same as Article 1.
For boiler ventilation, other parameters are the same as Article 1. For boiler induced draft, other parameters are the same as Article 1. A certain factory has made major modifications to the original 4-72 product. In order to facilitate distinction, the design serial number is added. Other parameters are the same as Article 1 Article. For air conditioning and ventilation, the total pressure coefficient is 2.2, the specific speed is 74, and the machine number is 5, that is, the impeller diameter is 500mm.
The impeller is a parallel type, and the specific speed is twice that of a single impeller. Other parameters: the same as Article 9.
3.3 The model of the axial flow fan series products is generally represented by the type, and the model of a single product is represented by the type and specification. The order relationship of the model composition is shown in Table 3.
Design serial number
Rotor position
Hub ratio
-Impeller stage
1, impeller stage code (referring to the impeller series stage), single-stage impeller can be unrepresented, and two-stage impeller is represented by "2". The use code is in accordance with the provisions of Table A1 in Appendix A. 2
Hub ratio is the percentage of the ratio of the outer diameter of the hub to the outer diameter of the impeller, and is a two-digit integer. 4 Rotor position code Horizontal type is represented by \A\ (can be omitted), vertical type is represented by "B\. Format
One machine number
5 Design serial number is represented by Arabic numerals "1", "2\, etc. For use when there are major modifications to this type of product. If the performance parameters, external dimensions, foundation dimensions, and wearing parts are not changed, the design serial number should not be used. If there are repeated codes or derivative types in the product type, the serial number is engraved before the design serial number, and Roman numerals 1, 1, etc. are used to represent it. 6 The machine number is represented by the impeller diameter (mm)/100 and is prefixed with the symbol N\ (see GB/T3235). 372
3.4 Examples of model representations of axial flow fans are shown in Table 4. Serial number
Axial induced draft fan for mines
Axial induced draft fan for mines
Axial induced draft fan for mines
Axial induced draft fan for mines
(General) axial flow fan
(General) axial flow fan
Axial flow fan for chemical gas exhaust
Fan
Cooling axial flow fan
2K70-1
JB/T8940—1999
For main fan induced draft in mines, hub ratio is 0.7, machine number is 18, i.e., impeller diameter is 1800 mm.
Two-stage impeller structure, other parameters are the same as in Article 1. The derivatives of this type of product (if there is a reverse wind device) are distinguished by [code, and other parameters are the same as in Article 2.
A factory has made major changes to the original 2K70 product. For easy distinction, it is indicated by "-1\ design serial number, and other parameters are the same as Article 2. For general ventilation, the wheel-hub ratio is 0.3, the machine number is 8, that is, the impeller diameter is 800mm.
The rotor of this product is a vertical structure, and other parameters are the same as Article 5. This type of product is used for chemical gas delivery, and other parameters are the same as Article 5.
For industrial water cooling, the wheel-hub ratio is 0.3,The rotor is a vertical structure, the machine number is 80, that is, the impeller diameter is 8000mm.
Application category
Industrial cooling water ventilation
Micro electric blower
General ventilation
Explosion-proof gas ventilation
Proof gas ventilation
Marine ventilation
Textile industry ventilation
Mine main ventilation
Local ventilation of mines
Tunnel ventilation
Boiler ventilation
Boiler induced draft
Ship boiler ventilation
Ship boiler induced draft
Industrial furnace ventilation
Dust exhaust ventilation
Coal powder blowing
Grain powder transportation
Hot air blowing and suction
High-temperature gas transportation
JB/T 8940—1999
Appendix A
(Appendix to the standard)
General purpose code for fan products
T(omitted)
The above table is extracted from the classification and terminology of fan products, and slightly increased. Serial number
If the purpose code is not enough to express, it is allowed to add a code, but no repeated code shall appear. 2
Appendix B
(Appendix to the standard)
Concept of specific speed
Purpose category
Sintering furnace flue gas
General purpose air transportation
Air powerwwW.bzxz.Net
Blast furnace blast
Converter blast
Diesel engine supercharging
Gas transportation
Chemical gas transportation
Petroleum refinery gas transportation
Natural gas transportation| |tt||For cooling and cooling
For freezing
For air conditioning
For film machinery cooling and drying
Ceramic materials
Glass fiber reinforced plastics
Rubber village
Power station boiler cooling and heating
Glass fiber reinforced plastics
T (provided Lu)
Specific speed can be used as the basis for the classification, serialization and similar design of fans, so it is a very important parameter of fans, expressed by n.
The specific speed of the fan is determined by formula (B1): n.=5.54
Where: 9v-——flow rate, m2/s;
u——total pressure, Pa;
o-—gas density at the fan inlet, kg/m2.374
JB/T89401999
When the fan inlet is in standard propulsion condition and the gas medium is air, β in the above formula is 1.2kg/m~, so the above formula can be written as ng 5.54n
V(pt)3
Generally, the specific speed of a centrifugal fan is n=15~80; for an axial flow fan, ng=100~500. .·(B2)
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