This standard specifies the type, basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of double-inlet centrifugal fans for single or air conditioning units. This standard applies to various fans for air conditioners specified in ZBJ73026. JB/T 7221-1994 Double-inlet centrifugal fans for unitary air conditioning units JB/T7221-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China bzxZ.net
Double-inlet centrifugal fans for unitary air conditioning units,
1 Subject content and scope of application
JB/T 7221-94
This standard specifies the type, basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of double-inlet centrifugal fans (hereinafter referred to as fans) for unitary air conditioning units (hereinafter referred to as units). This standard applies to various fans for air conditioners specified in ZBJ73026. Cited standards
GB1171
GB1236
GB2888
GB3882
Basic technical requirements for rotating electrical machines
Ordinary V-belts
Test methods for aerodynamic performance of ventilators
Noise measurement methods for fans and Roots blowers Dimensions of spherical ball bearings and eccentric sleeves GB10080
Safety requirements for ventilators for air conditioning
GB/T13306
ZB J72 017
ZBJ72026
ZB J72 029
ZB J72 046
ZB J72 048
ZB J73 026
Technical conditions for painting of heating, ventilation and air conditioning equipment General technical conditions for packaging of heating and cooling ventilation equipment
Appearance quality and cleanliness
Forward multi-blade centrifugal fan
Balance accuracy of fans for air conditioning
Unitary air conditioner
Type and basic parameters
The type of fan shall comply with the provisions of ZBJ72046. 4 Basic parameters
The basic parameters of the fan shall be in accordance with the provisions of Table 1. Table 1
Impeller diameter
Approved by the Ministry of Machinery Industry of the People's Republic of China on July 18, 1994 734
Design speed
Equipped power
Specific A sound pressure level
Implemented on July 1, 1995
Impeller diameter
10 170
JB/T 7221-94
Continued Table 1
National pressure
Design speed
Equipped power
4.1.1 The values ​​in Table 1 refer to the parameters of a double-suction centrifugal fan working alone under standard conditions. Specific A sound pressure level
Standard conditions are: atmospheric pressure po=101324.72Pa, atmospheric temperature t=20C, relative humidity p-50% air state. 4.1.2 The values ​​corresponding to the air volume in Table 1 are the working parameters of the fan at the optimal efficiency condition at the design speed. When selecting a fan, the working parameters at different speeds or wheel diameters should be calculated according to the characteristic curve of the fan of this model and the fan similarity formula. 4.1.3 According to the low noise requirements of the unit air conditioner, the fan speed should not exceed 1000r/min. 4.1.4 The determination of the fan A sound pressure level should comply with the provisions of GB2888. 4.2 The dynamic pressure value at the fan outlet should not be greater than 25% of the total pressure value at the optimal efficiency. 5 Technical requirements
The fan should meet the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 5.2
The relative humidity of the air conveyed by the fan should not exceed 95%. The maximum vibration speed (root mean square value) of the fan bearing seat should be less than 5.6mm/s. 5.3
The lubricant of the fan bearing should not leak out. 5.4
When the fan is at rated air volume, its total pressure shall not be less than 95% of the rated total pressure value. When the fan is at rated full pressure, its air volume shall not be less than 95% of the rated air volume value. 5.6
The safety requirements of the fan shall comply with the provisions of GB10080. The motor used in the fan shall comply with the provisions of GB755, and the V-belt used in the fan shall comply with the provisions of GB1171. The bearings used in the fan shall comply with the provisions of GB3882. The parts and components of the fan shall have sufficient strength and rigidity. The balancing accuracy of the fan impeller shall comply with the provisions of ZBJ72048. The painting of the fan shall comply with the provisions of ZBJ72017. 5.14
The appearance quality of the fan and its parts and components shall comply with the provisions of ZBJ72029. Under the condition that the user complies with the provisions of the product manual, the manufacturer shall provide free repair or replacement (excluding wearing parts) if the product is damaged or fails to work properly due to poor manufacturing quality within 18 months from the date of shipment by the manufacturer. 6 Test method
6.1 The aerodynamic performance test of the fan shall be in accordance with the provisions of GB1236. 6.2 The noise test of the fan shall be in accordance with the provisions of GB2888. 6.3 The vibration and overspeed test of the fan shall be in accordance with the provisions of GB10080. 735
7 Inspection rules
JB/T 7221-—94
7.1 The parts, components and complete machine of the fan shall be inspected and qualified by the quality inspection department of the manufacturer in accordance with this standard and the corresponding standards and technical documents before they can leave the factory.
7.2 Various inspections of the fan shall be in accordance with the provisions of Table 2. Table 2
Total pressure or static pressure
Shaft power (input)
Total pressure efficiency
Bearing temperature rise
7.2.1 Type inspection
Type inspection shall be carried out in any of the following cases: Trial products of each model;
Type of inspection
When there is a major change in the structure or material of the fan, which may affect the product performance; When the production is resumed after more than one year of suspension.
Sampling inspection
The number of sampling inspections shall be in accordance with the provisions of Table 3.
51～150
Sample size n
Qualified judgment number: A.
Unqualified judgment number R.
In normal batch production, each model of fan shall be sampled for inspection after factory inspection. If the number of unqualified products is less than or b.
equal to the qualified judgment number A in the random inspection. , and the batch of products is determined to be qualified. If the number of unqualified products in the random inspection is greater than or equal to the unqualified determination number R, the batch of products is determined to be unqualified.
8 Marking, packaging and storage
8.1 Marking
8.1.1 Each fan should have a label fixed in a conspicuous position. The type, size and technical requirements of the label should comply with the provisions of GB/T13306. The label should have the following content:
a. Manufacturer name;
b. Product model and name;
Air volume:
Total pressure or static pressure;
Speed;
JB/T7221-—94
Motor power (input), power supply voltage, frequency; manufacturing year and month;
Product factory number.
The fan should have a label indicating the working conditions (such as rotation direction). 8.1.2
The ventilator shall be marked with a registered trademark.
8.2 Packaging
8.2.1 The packaging of the ventilator shall comply with the provisions of ZBJ72026. 8.2.2 The following technical documents shall be included in the packaging box: a. Product certificate;
Product manual (including: product model, name, working principle, purpose, range, performance curve, product structure, installation diagram, installation instructions and requirements, instructions for use, maintenance and care, precautions); . Packing list.
8.3 Storage
8.3.1 The ventilator shall be stored in a ventilated and dry warehouse or shed, and the product shall be protected from collision and corrosive gas. 8.3.2 Exposed machined parts and components shall be coated with anti-rust oil or grease, and protected with oil paper, plastic film, etc., and the corrosion of the machined surface shall be checked regularly.
8.3.3 The storage period is one year. If it exceeds one year, it should be inspected and handled in time. Additional remarks:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Harbin Air Conditioning Machine Factory. The main drafters of this standard are Ren Shouyu and Zhu Yutian. 737
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