Some standard content:
JB/T9069--2000
This standard is a revision of the original ZBJ72035-90 "Technical conditions for roof axial flow fans" and the original ZBJ72047--90 "Centrifugal roof fans for air conditioning".
Appendix A of this standard is the appendix of the standard. This standard is proposed and managed by the National Technical Committee for Standardization of Refrigeration Equipment. The responsible drafting unit of this standard: Jiangsu Shenhai Group Co., Ltd. The main drafters of this standard: He Shuzhong and Huang Zhennan. 376
1 Scope
Machinery Industry Standard of the People's Republic of China
Roof fans
Roof fans
JB/T 9069--2000
This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of roof ventilators (hereinafter referred to as ventilators).
This standard applies to axial or centrifugal fans installed on roofs for ventilation and exhaust in industrial and civil buildings and other buildings. The operating medium is air, the medium temperature is ≤60C, and the dust content (including solid matter) of the medium should not exceed 100mg/m. 2 Reference standardsbzxz.net
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/T1236—1985 Test method for aerodynamic performance of fans GB/T 1449---1983
GB/T 2576-1989
GB/T 2577---1989
GB/T 2888 -- 1991
GB/T 3235---1999
GB 3836. 12000
GB/T 89241988
GB/T 9438 -1999
GB/T 13274--1991
GB/T 13275--1991
Test method for bending properties of glass fiber reinforced plastics (FRP)Test method for insoluble content (curing degree) of resin in fiber reinforced plasticsTest method for resin content of glass fiber reinforced plasticsNoise measurement method for fans and Roots blowersBasic types, dimensions, parameters and performance curves of fansExplosion-proof electrical apparatus for explosive atmospheres - Part -· General requirementsTest method for burning properties of glass fiber reinforced plasticsOxygen index methodAluminum alloy castings
-Technical conditions for axial flow fans for general purpose
Technical conditions for centrifugal fans for general purpose
GB/T 13306-
GB/T50205-1995
JB/T 6445-1992
JB/T 6886--1993
JB 8523- 1997
Steel Structure Construction and Acceptance Code
Fan Impeller Overspeed Test
Fan Coating Technical Conditions
Technical Conditions for Explosion-proof Fans
Fan Vibration Detection and Limits
JB/T 86891998
JB/T 9070-1999
Balancing accuracy of fans for air conditioners
3 Types and basic parameters
3.1 Type
3.1.1 Fans are classified according to the impeller type (see Figure 1): a) axial flow fans;
b) centrifugal fans
Approved by the State Bureau of Machinery Industry on August 31, 2000 and implemented on January 1, 2001
Axial flow
JB/T9069—2000
1~Air inlet; 2—Impeller; 3--Casing; 4—Motor Figure 1 Impeller type
3.1.2 Fans are classified according to the transmission mode (see Figure 2): a) Impeller and motor directly connected transmission type;
b) Impeller and motor driven by V-belt.
Direct drive type
1-air inlet: 2-impeller; 3-housing: 4-motorFigure 2 Drive mode
3.1.3 Fans are divided into the following types according to the air exhaust direction (see Figure 3): a) bottom exhaust type;
b) side exhaust type;
c) top exhaust type;
d) top and bottom exhaust type
bottom exhaust type
3.1.4 Fans are divided into the following types according to their usage characteristics:
a) general fan;
b) explosion-proof fan.
3.2 Model
side exhaust type
top exhaust type
Figure 3 Air exhaust direction
centrifugal type
V-belt drive type
top. Bottom exhaust type
Model example:
JB/T 9069-: 2000
Gas exhaust direction: Side exhaust type is indicated by number 2, Top exhaust type is indicated by number 3
Upper and bottom exhaust types are indicated by number 4
Car square exhaust type meter table
Motor and impeller transmission type: V-belt drive is indicated by letter V, direct drive is not indicated
Impeller diameter: dm, indicated by 1 to 3 digits. Impeller type: Axial flow type is indicated by letter Z
Centrifugal type is indicated by letter L
Basic code for roof ventilator
Use characteristic code: Explosion-proof ventilator is indicated by B, general ventilator is not indicated
WTI.12.5 indicates a centrifugal roof ventilator with an impeller diameter of 12.5dm, direct drive between the impeller and the motor, and bottom exhaust type. 3.3 Basic parameters
3.3.1 The fan impeller diameter shall comply with the relevant provisions of GB3235. 3.3.2 The fan aerodynamic performance is expressed by the three parameters of the fan static pressure psr, flow Q and shaft power Nh at the design operating point. 3.3.3 Static pressure of centrifugal fan: 0~320Pa. 3.3.4 The fan aerodynamic performance shall be evaluated based on the dimensional and dimensionless aerodynamic characteristic curves measured on the basis of the aerodynamic performance test.
3.3.5 For axial flow fans of different models at rated speed, the specific flow rate 0 during operation shall meet the following requirements: a) When the outlet air flow velocity is less than 10m/s, 6≥5; b) When the outlet air flow velocity is greater than or equal to 10m/s, 8=2. The calculation formula for the specific flow rate θ is:
Wherein:
Specific flow rate (dimensionless);
Fan flow rate, m\/h;
0—-Medium density, kg/m;
Impeller circumferential speed, m/s;
Nah\-Fan shaft power, W;
—-Flow coefficient (dimensionless);
Power coefficient (dimensionless).
4 Technical requirements
4.1 General requirements
(1)
The fan shall comply with the provisions of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures or the requirements agreed between the supplier and the buyer. 4.2 Product performance
4.2.1 The aerodynamic performance test shall be carried out on fans of different models and the corresponding typical aerodynamic performance curve shall be drawn. 379
JB/T9069--2000
4.2.2 The deviation between the measured aerodynamic performance value of the fan and the standard value of the typical aerodynamic performance curve shall meet the following requirements:
a) When the fan static pressure is the design condition value, the corresponding flow deviation is ±5%. b) When the fan static pressure is the design operating condition value, the corresponding flow coefficient shall not be less than 90% of the flow coefficient at the corresponding point. Note
1 The typical curve refers to the performance curve described in the product sample or other technical documents provided by the user. Measured value - standard value × 100%.
2 Deviation -
Standard value
The limit value of the specific sound level LsA of various types of fan noise at the best efficiency operating point shall comply with the provisions of Table 1 or be implemented according to the agreement between the supply and demand parties.
Table 1 Limits of the specific A sound level LsA of fan noise Fan type
Axial roof fan
Centrifugal roof fan
Specific A sound level LsA-dB
The specific A sound level of fan noise at the test operating point is calculated according to formula (3): LsA = LA 10lg(Qp2) + 19.8
Where: LsA——Specific A sound level at the fan inlet (or outlet), dB; LA—A sound level at the fan inlet (or outlet), dB(A); Q---Fan test condition.=Flow rate at the working point, m/min; p-total pressure at the working point of the fan test, Pa. Measurement location
According to GB/T 2888 and Appendix A (Appendix to the standard)
4.2.4 Under the specified working conditions, the fan and its auxiliary equipment should be designed with a service life of at least 10 years and a safe operation time of not less than 12,000 hours before the first overhaul.
4.2.5 The fan should be subjected to a mechanical operation test, running continuously at the working speed. After the bearing temperature stabilizes for 20 minutes, the bearing temperature rise and vibration should meet the following requirements:
a) The bearing temperature measured on the bearing surface shall not be higher than the ambient temperature of 40°C; b) The effective value of the vibration velocity is ≤6.3mm/s. 4.3 Structure
4.3.1 The structural type, strength, rigidity, etc. of the parts of the ventilator related to the axial flow fan or centrifugal fan shall meet the following requirements: the centrifugal roof ventilator shall comply with the relevant provisions of "Structure" in GB/T13275; the axial flow roof ventilator shall comply with the relevant provisions of "Structure" in GB/T13274.
4.3.2 The ventilator shall have sufficient strength and rigidity to ensure that it can withstand possible wind and snow loads. The wind load bearing capacity shall be based on the fact that the ventilator is not damaged at a wind speed of 30m/s. 4.3.3 Large parts such as the hood and casing of the ventilator shall be equipped with transportation and installation lifting devices. 4.3.4 The ventilator shall have an inspection hole for easy maintenance and observation, as well as a protective structure to prevent foreign objects from intruding. Ventilators of N10 and above shall be equipped with There is a safety net to prevent tools and parts from falling during maintenance. 4.3.5 According to the needs of use, the fan can be equipped with a check valve to prevent air backflow. The check valve can be gravity-automatic closing type or motor-driven opening and closing type.
4.3.6 Fans with installed power ≥15kW should be equipped with external oiling devices for oiling and maintenance of impeller spindle bearings and motor bearings.
4.3.7 The fan should have a grounding protection device. 4.3.8 Explosion-proof fans must be equipped with explosion-proof motors and explosion-proof auxiliary electrical components. The motors and auxiliary electrical components must comply with the provisions of GB3836.1 and have explosion-proof product certificates. Their manufacturers must have corresponding explosion-proof electrical equipment production licenses. 380
4.4 Materials for main parts
JB/T 9069—2000
4.4.1 The materials used for the fan shall comply with the provisions of the relevant standards and have a material certificate. 4.4.2 The materials used for the rotating parts shall be subject to chemical inspection and have an inspection report. Cracks and other defects exceeding the standard are not allowed. 4.4.3 The main structural parts of the fan can be made of steel plate welded structure or fiberglass molded parts, or both structures can be used at the same time. 4.4.4 The impeller material of the fan can be: a) steel plate welding;
b) cast aluminum alloy;
c) fiberglass molding.
4.4.5 The design of explosion-proof fan parts, especially rotating parts and adjacent fixed parts, should not only meet the requirements of strength, rigidity, wear resistance, etc., but also consider explosion-proof properties. The explosion-proof requirements shall comply with the provisions of JB8523. 4.4.6 The fiberglass components in explosion-proof fans must use anti-static fiberglass or other anti-static measures. 4.4 .7 Fiberglass components must meet the following requirements: 4.4.7.1 Resin content
a) The resin content of the fan housing (excluding the gel coat layer) should be controlled at 45% to 55%, and the resin-rich layer should be above 70%; b) The resin content of the fan blades should be controlled at 43% to 50%. 4.4.7.2 Degree of curing
a) The degree of curing of unsaturated polyester resin fiberglass should not be less than 80%; b) The degree of curing of epoxy resin fiberglass should not be less than 90% . 4.4.7.3 Bending strength
a) The bending strength of unsaturated polyester resin FRP shall not be less than 147MPa; b) The bending strength of epoxy resin FRP shall not be less than 196MPa, 4.4.7.4 Flame retardant performance
The resin used shall have excellent flame retardant performance, and the oxygen index of FRP shall not be less than 30. 4.5 Manufacturing
4.5.1 The impeller shall be balanced and calibrated; the balancing accuracy shall not be less than G6.3 level. 4.5.2 The impeller shall be subjected to overspeed test, the impeller overspeed speed shall be 110% of the maximum working speed, and the overspeed time shall not be less than 2min. 4.5.3 The radial single-side clearance between the air inlet of the centrifugal roof ventilator and the inlet of the impeller cover shall comply with the provisions of GB/T13275; the radial single-side clearance between the casing and the impeller of the axial flow roof ventilator shall comply with the provisions of GB/T13274; the radial clearance between the casing and the impeller of the explosion-proof roof ventilator shall comply with the provisions of JB8523.
4.5.4 The technical requirements for aluminum alloy castings shall comply with the provisions of GB/T9438. 4.5.5 The processing, installation and acceptance of steel components shall comply with the requirements of GB/T50205. 4.5.6 The technical requirements for fan coating shall comply with the provisions of JB/T6886. 4.6 Appearance
4.6.1 The fan surface shall be smooth and flat, and shall not have rust, coating peeling, or bruises. 4.6.2 The outer surface of the FRP component shall have a uniform gel coat layer, a smooth and flat surface, uniform color, and no cracks, bubbles, or defects. The inner surface shall be smooth and flat, with neat edges and uniform thickness. The fibers shall not be exposed and there shall be no delamination. The ding section shall be sealed with resin. 4.6.3 Before shipment, the fan must be clean inside and outside. 5 Test method
5.1 The aerodynamic performance test of the fan shall be carried out according to the method specified in A1 of Appendix A of GB/T1236. 5.2 When the conditions for implementation in accordance with 5.1 are not met, the aerodynamic performance test may be carried out in accordance with the method specified in the air intake test device in 3.1.1 of GB/T1236.
5.3 In addition to the relevant provisions of GB/T2888, the noise test of the fan shall also comply with the provisions of Appendix A. 381
JB/T 9069~-2000
5.4 The vibration accuracy test of the fan shall be in accordance with the provisions of JB/T8689. 5.5 The balance of the fan impeller shall be in accordance with the provisions of JB/T9070. 5.6 The impeller overspeed test shall be in accordance with the provisions of JB/T6445. 5.7 Performance test of FRP parts
a) Resin content test shall be in accordance with GB/T2577; b) Curing degree test shall be in accordance with GB/T2576; c) Bending strength test shall be in accordance with GB/T1449; d) Determination of flame retardant performance oxygen index shall be in accordance with GB/T8924. 6 Inspection rules
Inspection classification
Inspection of ventilators is divided into factory inspection and type inspection. 6.2 Factory inspection
Factory inspection items include appearance quality, impeller balance, impeller and casing clearance, impeller overspeed test, and vibration accuracy. 6.3 Type inspection
6.3.1 Type inspection should be carried out when any of the following situations occurs: a) the first product of each type of ventilator;
b) when there are major modifications to the design, structure, materials and processes that may affect product performance; c) when the factory inspection results are significantly different from the last type inspection; d) when the national quality supervision and inspection department proposes to conduct a type inspection. 6.3.2 The type inspection items for ventilators should include all items in Chapter 4 of this standard. 6.4 Judgment rules
6.4.1 Each ventilator must be inspected and qualified by the manufacturer's quality inspection department, and can only be shipped after a certificate of conformity is issued. 6.4.2 Samples for type inspection should be taken from qualified products in the factory inspection. The batch size shall not be less than 3 units, and the sampling number shall be 1 unit. 6.4.3 Judgment conditions
a) For a sample that has one item that is unqualified in the inspection, remedial measures are allowed to be taken once and the sample is inspected again; if it meets the requirements, it is judged to be qualified, otherwise the sample is judged to be unqualified. b) Among the samples that are unqualified, another sample is selected. If the inspection still fails, the batch of products is unqualified. 6.5 User requirements
When the user needs to participate in the test and inspection of the fan, it should be stipulated in the contract between the supply and demand parties. 7
Warranty period
Within no more than 18 months after delivery (calculated from the date of shipment), if the product is damaged or cannot work normally due to manufacturing quality problems, the manufacturer should repair or replace parts for the user free of charge. 8 Marking, packaging, transportation and storage
8.1 Marking
8.1.1 A turning arrow and product label should be installed in a conspicuous position on each fan. Explosion-proof fans should also have explosion-proof marks. The content of the product label shall at least include:
a) Model and name;
b) Main technical performance parameters: fan total pressure (or static pressure), flow, motor power, speed; c) Product number;
d) Manufacturing date;
e) Manufacturer name and address;
f) Product label.
JB/T 9069—2000
8.1.2 The size and technical requirements of the label shall comply with the provisions of GB/T13306. 8.2 Packaging
8.2.1 The product can be packed in wooden boxes or materials with similar wooden box structures. The box body should have obvious signs indicating the product name, model, weight and precautions.
8.2.2 The technical documents accompanying the product packaging should include product certificates, product manuals or samples, packing lists, and should be packed in moisture-proof bags. 8.3 Transportation and storage
8.3.1 The transportation of fans should meet the requirements of land and water transportation. There should be no collision during transportation and it should be protected from rain. 8.3.2 Fans should be stored in a dry environment to prevent the motor from getting wet. 383
JB/T9069-2000
Appendix A
(Appendix to the subject matter)
Supplement to the noise measurement method
A1 In addition to the measurement according to the relevant provisions of GB/T2888, the following supplements are made: a) The measurement of fans should be carried out under conditions similar to the use status or on site (Figure A1). The noise radiated from the air inlet is measured on the central axis of the air inlet (internal noise), and the noise measured on the horizontal extension line of the hood opening (external noise) is used as a reference value. In order to eliminate the influence of internal and external noise during measurement, the measurement should be carried out after adding a sound insulation wall of appropriate thickness to the plane of the base. b) Measurement point location (Figure A1), internal noise is measured 1.5m below the fan base, and external noise is measured at a distance of 1.5m from the horizontal plane of the hood outlet. When the impeller diameter is greater than 1.5m, the measurement distance is equal to the distance of the impeller diameter. 05
Sound insulation wall
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