JB/T 6411-1992 Axial flow fans for heating, ventilation and air conditioning

This standard specifies the type, basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of axial flow fans for HVAC and air conditioning. This standard applies to fans made of metal with an air volume range of 120 to 460 000 m3/h and a static pressure range of 30 to 350Pa. Fans made of non-metallic materials can also be used as reference. JB/T 6411-1992 Axial flow fan for HVAC and air conditioning JB/T6411-1992 Standard download and decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Axial Flow Fans for HVAC
1 Subject Content and Scope of Application
JB/T 6411-92
This standard specifies the type, basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of axial flow fans for HVAC (hereinafter referred to as "fans"). This standard applies to fans made of metal with an air volume range of 120-~460000m2/h and a static pressure range of 30~~350Pa. Fans made of non-metallic materials can also be used for reference. 2 Reference standards
GB1236
GB 2888
Test method for aerodynamic performance of ventilator
Noise measurement method for ventilator and Roots blowerTechnical requirements for aluminum alloy castings
GB9438
GB10080
GB10178
Safety requirements for ventilators for air conditioning
Field test of ventilator
GB/T 13306
Signage
ZB J72 017
ZBJ72026
ZB J72029
ZB J72 038
ZB J72 039
JB/T 6445
JB/TQ334
JB/TQ 337wwW.bzxz.Net
IB/TQ444
Technical conditions for coating of heating, ventilation and air conditioning equipmentGeneral technical conditions for packaging of heating and cooling ventilation equipmentAppearance quality and cleanliness of heating and cooling ventilation equipmentQuality inspection of welding of fans
Technical conditions for riveted and welded parts of fans
Test method for overspeed of impeller of fans
Vibration accuracy of fans
Balance of rotor of fans
Technical conditions for steel castings for fans
3.↑Blowers are divided into two types according to their use: ordinary type (Figure 1) and tower type (Figure 2): fans are divided into four types according to the transmission mode: direct connection with motor, pulley drive, coupling drive and gear drive. The type code of fans shall be in accordance with the provisions of Table 1. Figure 1
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 20, 1992, and sold on January 1, 1993
Purpose
Transmission mode
3.2 Model compilation method
Ordinary type
Tower type
Motor direct connection
Pulley drive
Coupling drive
Gear drive
JB/T 6411--92
Figure 2
Table 1
Symbol
The model of the fan is composed of uppercase Chinese pinyin letters and Arabic numerals. The specific expression method is as follows: Design sequence number: expressed by numbers
Transmission mode code: see Table 1|| tt||Machine number, NoImpeller diameter, dm (see Table 2)Hub ratio code: hub ratio × 100
Application code: see Table 1
Model example:
Structural features
Pulley in the middle of the bearing
Pulley outside the bearing
Z38N5A-1: Impeller diameter is 500mm, hub ratio is 0.38, and it is a common motor direct-connected fan designed for the first time. L40No20G-2: Impeller diameter is 2000mm, hub ratio is 0.40, and it is a tower gear-driven fan designed for the second time. 4
Basic parameters
The machine number and impeller diameter of the fan shall comply with the provisions of Table 2. Table 2
Machine No.
Impeller (blade
outer edge) diameter
Machine No.
Impeller (blade
outer edge) diameter
Machine No.
3.0||t t||3.15*
Impeller (blade
external extension) diameter
Machine number
Impeller (blade
external edge) diameter
Machine number
Impeller (blade
outer edge) diameter
Machine number
Note: The machine number with * is preferred.
4.2 The number of blades of the fan shall be in accordance with the provisions of Table 3
5 Technical requirements
5.1 General requirements
JB/T 6411-92
Continued Table 2
Impeller (blade
outer edge) diameter
Machine number
Table 3
Impeller (blade
outer edge) diameter
Machine number
50||tt ||10
Impeller (blade
outer edge) diameter
5.1.1 The fan shall be manufactured in accordance with the provisions of this standard and in accordance with the drawings and technical documents approved through the prescribed procedures or according to the agreement between the supplier and the buyer. 5.1.2 The materials and accessories used in the fan shall comply with the provisions of the relevant standards and meet the requirements of the conveying medium and operating conditions. 5.2 Product performance
5.2.1 The fan shall be subjected to an aerodynamic performance test and a complete aerodynamic performance curve shall be drawn. 5.2.2
regulations.
Within the working range at rated speed, the deviation between the measured aerodynamic performance curve and the typical performance curve of the fan is as shown in Table 4 of Table 4
Machine number NG
The measured static pressure efficiency Ratio to rated
static pressure efficiency, %
static pressure deviation
3.55~3.75
93|| tt||4~~4.25
4.5~~4.75
≥96| |tt||>5
5.2.3 The fan noise spectrum curve should be drawn. The noise of ordinary fans should not exceed 32dB(A); the noise of tower fans should not exceed 28dB(A).
5.2.4 The bearing temperature or the oil temperature in the gearbox should not exceed 80C. 5.2.5 The effective value of the vibration speed of the fan (root mean square speed) is not greater than 5.6mm/s. 5.3 Service life
5.3.1 The service life of the fan and its auxiliary equipment shall comply with the requirements of Table 5. 325
Machine number
>8~20
JB/T 6411--92| |tt||Table 5
Service life
5.3.2 Before the first overhaul period for fans with machine number greater than 8 The safe operation time should be no less than 18000h. 5.4 Safety requirements
The safety requirements of fans are in accordance with the regulations of GB10080. 5.5 Requirements for parts
5.5.1 Impeller
5.5.1.1 The balance requirements of the impeller are as follows: Reason.
The machine number is not greater than 20, and the dynamic balancing accuracy is not less than G4.0; the machine number is greater than 20, and the hub dynamic balance accuracy reaches G4.0 before static balancing of the impeller. b.
5.5.1.2 The impeller should have sufficient strength and rigidity to prevent deformation during handling and operation. 5.5.1.3 The welding and riveting quality of the impeller should comply with the regulations of ZBJ72038 and ZBJ72039. 5.5.1.4 The cast impeller shall undergo an overspeed test in accordance with the provisions of JB/T6445. 5.5.1.5 If the machine number is not greater than 16, the impeller blades are fixed; if the machine number is greater than 16, the impeller blades are adjustable. The blades of the impeller should be evenly distributed, and the gap between the profile line and the template, the pitch deviation and the installation angle deviation should comply with the provisions of ZBJ720395. 5. 1.6
5.5.2 Chassis
5.5.2.1 The casing of the ordinary fan is made of carbon steel plate, and its manufacturing accuracy should comply with the regulations of ZBJ72039. 5.5.2.2 For direct-coupled motor fans, a motor support with sufficient strength and stiffness should be installed in the casing. The height of the motor support should be such that the center of the motor is consistent with the center of the casing. Use adjustment shims between the motor and the support to adjust the center height of the motor, but the shims must not exceed two layers.
5.5.3 The materials used for rotating parts should have quality guarantee certificates or managerial inspections and inspection reports. 5.5.4 Aluminum alloy castings should comply with the regulations of GB9438; steel castings should comply with the regulations of JB/TQ444. 5.6 Appearance quality
5.6.1 The painting of the fan should comply with the regulations of ZBJ72017. 5.6.2 The appearance quality of the fan should comply with the relevant regulations of ZBJ72029. 5.7 Warranty period
Provided that the user abides by the provisions of the product manual, within 18 months from the date of shipment from the manufacturer, the actual use time does not exceed 8000h, if the product is damaged or inoperable due to poor manufacturing quality or During normal operation, the manufacturer should repair or replace it free of charge (excluding wearing parts).
6 Test methods
6.1 The static and dynamic balance of the impeller shall be in accordance with the provisions of JB/TQ337. 6.2 After the temperature rise stabilizes, the continuous operation test time of the fan should be no less than 20 minutes. The bearing temperature or the oil temperature and dynamic speed in the gear box are measured. The vibration speed is measured according to the provisions of JB/TQ334. 6.3 The aerodynamic performance test of the fan shall be in accordance with the provisions of GB1236. Fans with machine numbers greater than 12 shall be tested on site in accordance with GB10178.
6.4 The noise measurement of the fan shall be in accordance with the provisions of GB2888. 326 | | tt | | 7 | | tt | Factory. 7.2 For the specified test and inspection items, there should be test reports or inspection records. 7.3 Inspection is divided into three types: type inspection, factory inspection and sampling inspection. Various inspection items are as specified in Table 6. Table 6
operation test
vibration speed effective value
. Sound
Input electric power
Bearing temperature or gearbox oil temperature
Balance test of rotating parts
Aerodynamic performance test
Appearance inspection
7.3.3| | tt | Old products produced by transferred factories; ANg
Factory inspection
N8~N20
After formal production, when the structure, materials and processes have undergone major changes, which may affect product performance; product When it was produced again three years after it was discontinued.
Every product should undergo factory inspection.
The sampling inspection regulations are as follows:
Fans produced in batches should undergo routine sampling inspection to check the stability of the production process; the number of products of the same model within one year is regarded as an inspection batch, and the sampling time should be The equilibrium distribution is in 1a; the inspection plan is based on the one-time sampling plan specified in Table 7. Table 7
Machine number NO
≤1000
>1 000～2 000
>500-~1 000
>300～600
>50～100
Sampling quantity
2||tt ||5
Pass judgment number A.
7.4 The aerodynamic performance curve of the sampling fan should be inspected according to the typical performance curve. 7.5 The noise measurement of the fan should be carried out simultaneously with the aerodynamic performance test. 8 Marking, Packaging and Storage
>N20
Number of unqualified judgment R.
2| |tt||2
8.1.1 Fans or reducers, oil pumps, fuel tanks and other independent components should have nameplates in obvious locations. The size and technical requirements of the nameplates should be Comply with the regulations of 327
GB/T13306.
Nameplate contents include:
, etc.).
Product name and model;
JB/T 6411—92
Main characteristic parameters (air volume, static pressure, noise, speed, motor power)); Product number: ||tt ||Manufacturing date;
Manufacturer name.
On the fan or its parts and components, there should be signs of the working status or adjustment position (such as the rotation direction of the rotor and the oil level line) as needed. 8.1.3 Packing box markings should comply with the regulations of ZBJ72026. 8.2 Packaging and storage
The fans should be packed according to the number, item and number of pieces specified in the packing list. The packaging should comply with the provisions of ZBJ72026 8.2.2. The storage space of the fan should be dry and ventilated, free of corrosive gases, and protected from rain and sunlight. Additional notes:
This standard is proposed and administered by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronics Industry. This standard is drafted by Shangyu Fanguang and Shanghai Jiao Tong University. The main drafters of this standard are Xu Cangen, Ren Shiyao, and Dong Hanxiang. 328
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