Some standard content:
JB/T6412—1999
Preface
This standard recommendation is based on ZBJ72049-90 "Fume hood type and basic parameters". JB/T5150-91 "Fume hood test" Method" and JB/T641292 "Technical Conditions for Fume Cabinets". This standard replaces ZBJ72049-90, JB/T5150-91 and JB/T6412-92 from the date of implementation. This standard is proposed and administered by the National Refrigeration Equipment Standardization Technical Committee. The units responsible for drafting this standard: Tongji University, Yixing Zhanhong Environmental Protection Equipment Co., Ltd. The main drafters of this standard: Li Qiangmin and Cao Qiuban. 718
1 scope
Machine Industry Standard of the People's Republic of China
Fume hood
Fume hood
JB/T6412-1999
Replacement ZBJ72049--90
JB/T 5150—91
JB/T6412—92
This standard specifies the type, basic parameters and dimensions, technical requirements, and test methods of fume hoods and inspection rules and marking, packaging and storage. This standard is recommended for factory-made fume hoods. This standard does not apply to local exhaust hoods in industrial ventilation systems. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T13306—1991 Label
JB/T9065--1999 General technical conditions for packaging of heating and cooling ventilation equipment JB/T7246—1994 Appearance quality of heating and cooling ventilation equipment 3 definitions
This standard adopts the following definitions.
Control concentration
Indicator for evaluating the discharge volume of fume hood. When the fume hood is operating normally, adjust the flow rate of the tracer gas releaser in the fume hood to 4.0L/min, and measure the SF with the operator's breathing belt in front of the fume hood. tracer gas concentration. 4 Type
4.1 The exhaust hood is divided into two types according to the air flow organization: standard type and supplementary air type. According to functional needs, they are divided into two types: desktop exhaust hood and double-sided exhaust hood. According to the work surface material, it is divided into four types: fiberglass, stainless steel, ceramic and lead. The code number of the fume hood type should comply with the requirements in Table 1. Table 1
item
product name
National Machinery Industry Bureau 1999-07-12 approved project
standard exhaust hood
supplementary air exhaust Fume cupboard
Desktop fume cupboard
Double-sided fume cupboard
Generation
FG
No.
FGB||tt| |FGT
FGS
2000-01-01 implementation
719
Work surface material type
item
item||tt| |JB/T 6412—1999
Table 1 (End)
GRP
Stainless Steel
Ceramics
Lead
4.2 Fume Cabinet The model number consists of uppercase Chinese pinyin and Arabic numerals, and the specific representation method is as follows: -
口
Material type of the countertop, the code number is shown in Table 1
Outline width of the fume hood, three digits Numbers , the overall width is 1200mm, which is the standard fume hood, the stainless steel work surface, the overall width is 1500mm5 basic parameters and dimensions
5.1 The performance parameters of the fume hood should comply with the provisions of Table 2. Table 2
Type
Formula
FG-120
FGB-120
FGT-120
FGTB-120||tt| |FGS-120
FGSB-120
FG-150
FGB-150
FGT-150
FGTB-150
FGS -150
FGSB-150
FG-180
FGB-180
FGT-180
FGTB-180
FGS-180
FGSB-180
5.2 size
720
Operation port average face wind speed
m/s
0. 4 ~~ 0 . 5
Exhaust air volume range
m/h
900~1 500
1 800~3 000
1100~1 900||tt ||2 200--3800
1400--2400
2 800--4 800
Supplementary air volume range
m/h
0| |tt||600～1 000
0
600--1000
o
1 200-2 000
0
700~1300
0
7001300
1400~~2600
C
900~1 600
o
900~~1 600
o
1800~3 200
Control concentration
mL/m2
0.5
generation||tt ||No.
B
G
T
Q
Resistance
Force
Pa
70
The size parameters of the fume hood should comply with the requirements in Table 3. Type
Form
FG-120
FGB-120
FGT-120
FGTB-120
FGS-120||tt ||FGSB-120
FG-150
FGB-150
FGT-150
FGTB3-150
FGS-150
FGSB-150
FG-180
FGB-180
FGT.180
FGTB-180
FGS-180
FGSB- 180
requirement
6
width
1 200
1500
1800
thick
JB /T6412-1999
Table 3
High
800-900
16001800
800~~900
2400||tt| |1 600~~1 800
800~~900
1 600~1800
Work surface
Height
800~900||tt| |800~900
800-900
800~900
800-~900
800~900
Maximum opening of cabinet door||tt| |Height
600800
6.1 The exhaust hood shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 6.2 The surface air velocity of the exhaust hood should be evenly distributed, and the deviation between its maximum value, minimum value and the arithmetic mean should be less than 15%. 6.3 The control concentration of the fume hood should be less than 0.5ml/m26.4 The resistance of the fume hood should be less than 70Pa
6.5 The allowable deviation of the overall dimensions of the fume hood is ±3mm. 6.6 The allowable deviation of the effective internal height of the exhaust is ±3mm. 6.7
The flatness of the fume hood should not be greater than the requirements in Table 4 over the entire length. Table 4
Basic dimensions
Tolerance value
800
0.5
>800~~1 200
No.8| |tt||mm
Inside the fume hood
effective height
≥1 100
>12002400
W1.0
6 .8. The paint quality of the fume hood should be harmonious in color, durable, with strong paint film adhesion and firm bonding. There should be no defects such as bubbles, flow marks, knots, etc. After testing according to the method in 7.8, the number of paint film peeling off should not exceed 17%. . 6.9 The operating door of the fume hood should be easy to operate, without jamming, and can stay at any position within the travel range. 6.10 The work surface of the fume hood should be sloping towards the pool. 6.11 The fume hood should be equipped with lighting equipment, fan switches, power sockets, indicator lights, water supply and drainage devices, and openings for air supply pipes. 721 | | tt | | JB/T6412—1999 | 6.13 The fume hood is made of fiberglass, thin steel plate or stainless steel and other corrosion-resistant composite materials. 6.14 The oxygen index of FRP components should be greater than 276.15 The surface in the fume hood that is in contact with corrosive media should be made of acid-resistant, alkali-resistant, and high-temperature-resistant materials. 6.16 The appearance quality of the fume hood should comply with the relevant provisions of JB/T7246. 6.17 When the power supply voltage deviation is ±10%, the fume hood should be able to start normally. 6.18 The standard parts, outsourced parts and purchased parts of the fume hood should comply with relevant regulations and be accompanied by certificates of conformity. 6.19 Under the condition that the user abides by the provisions in the product manual, and the actual use time does not exceed 12,000 hours within 18 months from the date of shipment from the manufacturer, if the product is damaged or fails to work properly due to poor manufacturing quality, the manufacturer will Should be repaired or replaced free of charge. 7 Test method
7.1 Flow display test
7.1.1 Test conditions
The test should be conducted indoors, and there should be no flow exceeding 0.1m/s within 1.5m from the fume hood. Cross-flow interference. 7.1.2 Reagent
Titanium tetrachloride reagent.
7.1.3 Test steps
With the fume hood door at its maximum opening, use a cotton swab dipped in titanium tetrachloride (TiC1) to clean the work surface, inner wall and inner roof of the fume hood. Draw a straight line parallel to the cabinet door on the surface, which is 150mm away from the cabinet door. Draw a circle with a diameter of 200mm on the back wall of the exhaust hood. The center of the circle is located at the geometric center of the cabinet wall. All equipment in the cabinet are painted on the surface. on titanium tetrachloride. When the fume hood is operating normally, all white smoke should be discharged through the exhaust outlet without spillage. 7.2 Surface wind speed test
7.2.1 Test conditions
Same as 7.1.1.
7.2.2 Test instruments and materials
Hot bulb electric anemometer, recording form, tape paper, thin wire and 2m steel tape measure. 7.2.3 Test steps
Open the upper regulating valve of the exhaust hood and open the cabinet door to the maximum degree. Start the exhaust fan and adjust the exhaust fan outlet valve. Use a hot-ball electric anemometer within the calibration period to measure the operating port. Cross-section wind speed, the average wind speed is 0.4~0.5m/s. The operation port section is divided into no less than 16 rectangular measuring areas according to Figure 1. The area of ??each measuring area should be less than 0.09m2. The measuring points are set at the intersection of the diagonals of each measuring area.
Figure 1
7.3 Determination of supplementary air volume
722
7.3.1 Test instrument
Hot bulb electric anemometer.
7.3.2 Measurement methodwwW.bzxz.Net
JB/T 6412—1999
Adjust the air supply valve and use a hot ball electric anemometer to measure the air supply volume of the air supply type fume hood. The arrangement of measuring points on the pipe section is shown in Figure 2. R air supply duct radius (mm); R,-0.866RoRz=0.5Ro Figure 2
7.3.3 Debugging requirements
Make the air supply volume reach the rated value.
7.4 Concentration Test
7.4.1 Test Conditions
7.4.1.1 Laboratory Ventilation Conditions
The air supply and exhaust of the laboratory and the exhaust of the fume hood should be normal and should meet the requirements of 7.1.1. 7.4.1.2 Exhaust hood conditions
The exhaust hood door should be fully open. For supplementary air exhaust hoods, the supplementary air system should be in running status, and the supplementary air volume should be adjusted to the rated value. 7.4.1.3 The background concentration of the tracer gas in the test room is controlled below 10% of the control concentration in the fume hood. 7.4.2 Test instruments and materials
Micro-anemometer: Range 0.0510m/s
Ejector: See Figure 3.
Detector: Range 0.01~100mL/m2, response time no more than 10s. Automatic recorder: reading accuracy is ±0.5% of full range. Tracer gas: Sulfur hexafluoride (SF.). Human body model: three-dimensional clothing, height 168cm ± 6.cm, shoulder width 43cm ± 2cm, breathing belt height 150cm, shoulder height 138cm ± 6 cm.
Accuracy requirements for detector readings:
When the concentration of the tracer gas is 0.01~~0.1ml/m, it is ±25%; when the concentration of the tracer gas is above 0.1mL/m2, It is ±10%
When the concentration of the tracer gas is above 50ml./m2 and the reading can be repeated, it is ±1%. 723
7.4.3 Test steps
JB/T 6412—1999
1005500
1--Exit diffuser; 2-Ejector; 3 Upper spray Pipe pressure reducer; 4—Lower nozzle pressure reducer; 5—Pressure gauge: 6—Pressure regulator: 7—Ejector bracket Figure 3
Turn on the detector, and after stabilization, trace in the material laboratory To ensure that the background concentration of the gas meets the requirements of 7.4.1.3, proceed as follows.
The flow rate of the ejector selected is 4L/min. Adjust the upstream pressure of the ejector to 200kPa. Functional test: Before the test, calibrate the detector with low concentration tracer gas. If the detector cannot respond correctly, it should be corrected before testing.
The ejector is installed in the left, middle and right positions of the cabinet door. In the left position, the axis of the injector is 300mm away from the left inner wall. In the middle position, the distance from the axis of the injector to the two inner sides is equal. In the right position, the axis of the injector is 300mm away from the right inner wall. In these three positions , the distance between the front edge of the ejector and the cabinet door is 150mm, see Figure 4. Horizontal cabinet door
Ejector
Picture 4
Horizontal cabinet door
Ejector
Measure the middle position first, and the installation position of the human body model is as shown in the figure As shown in 4, make the human body model face the ejector, and the nose tip of the human body model is 25 mm away from the outer plane of the cabinet door.
Fix the position of the detector stylus so that its tip is located in the area between the nose and mouth of the human model's face. The long axis of the stylus is parallel to the cabinet door. The height of the stylus tip from the ground is 1500mm, such as As shown in Figure 5. The stylus is fixed with a metal wire or a laboratory-specific ring clamp. When connecting the stylus to the breathing belt of 724
JB/T 6412--1999
close to the human model, ensure that the human model The surrounding air flow pattern is not disturbed and destroyed. The probe is located in the human respiratory zone and parallel to the plane of the cabinet door. Figure 5
Open the tracer gas control valve.
Observe and consider the detector readings for 10 minutes, either manually or automatically. When using manual recording, record readings every 2 minutes.
7.4.4 Rearrange the positions of the ejector and human model on the left and right respectively. For each test position, repeat the test steps of 7.4.3.
7.4.5 Calculation method
Calculate the average of the readings at the three test locations, and take the maximum value as the control concentration of the fume hood. Fume hood performance ratings are expressed in the form XXAMYYY. XX represents the gas release amount of the tracking gas, in L/min; YYY represents the fume hood control concentration, in mL/m, and AM represents the working conditions measured under laboratory conditions. 7.5 Resistance test
7.5.1 Test conditions
Same as 7.4.1, 1 and 7.4.1.2.
7.5.2 Test instruments
Pitot tubes and tilt pressure gauges within the calibration period. 7.5.3 Test method
Use a square to round joint on the top of the fume hood to connect a circular pipe with a diameter of 200 to 300mm. The length of the pipe is 1400~2500mm, and a measuring hole is left on the round pipe 800~~1500mm away from the joint. The arrangement of measuring points on the inner section of the pipe is shown in Figure 2. Keep the wind speed at the exhaust cabinet surface at 0.4~~0.5m/s, use a Pitot tube to measure the total pressure value and dynamic pressure value at each measuring point, and take the average value as the total pressure value and dynamic pressure value in the pipeline || tt||7.5.4 Calculation method
From =V2p/p, find the speed of the measuring point section, where is the air density. The local resistance of the square-to-circle joint and the resistance along the path of the round pipe in front of the measuring point are obtained from the cross-sectional velocity. The resistance of the fume hood is calculated by the following formula:
p2== {pl pm p
where;.…Exhaust cabinet resistance, Pa
Total pressure value at measuring point, Pa;
pLocal resistance of square-to-round joint, Pa;
pl—Long-range resistance of round pipe in front of measuring point, Pa. 7.6 Flow display test, surface velocity test, controlled concentration test, resistance measurement test and air supply volume test shall comply with the relevant 725
provisions of Chapter 7.
JB/T 6412—1999
7.7 Insulation resistance test: Under normal temperature and humidity conditions, use a 500V insulation resistance meter to measure the insulation resistance between the live part and the non-live metal part of the fan coil.
7.8 Paint film adhesion test: Take an area of ??10mm in length and 10mm in width on the outer surface of the box, and use a new razor blade to make 11 parallel cuts with a spacing of 1mm and a depth of 1mm in both vertical and horizontal directions, and evaluate by the ratio of the number of grids where the paint film falls off within the scratch range to 100. If the paint film of each small grid is less than 70%, it is considered to be peeled off.
8 Inspection rules
8.1 The inspection of exhaust hoods is divided into factory inspection, type inspection and sampling inspection. 8.1.1 Type inspection should be carried out in one of the following situations: a) New products manufactured or old products transferred to other factories; b) After formal production, when there are major changes in structure, process and materials that may affect product performance; c) When the product is produced again after being discontinued for three years. 8.1.2 Various types of inspections for exhaust hoods shall be in accordance with the provisions of Table 5. 8.2 Sampling inspections for exhaust hoods shall be in accordance with the provisions of Table 6. Table 5
Test items
Appearance dimensions
Appearance quality
Insulation resistance
Flow display
Controlled concentration
Surface wind speed
Resistance
Supplementary air volume
Annual output N
50
50～200
>200
Marking, packaging and storage
9
Type inspection
Sample
Book n
1
2
3
Table 6
Inspection category
Sampling inspection
Qualified judgment number A.
0
9.1 The label of each fume hood shall comply with the relevant provisions of GB/T13306 and shall be marked with the following contents: a) Manufacturer name;
b) Product model and name
c) Main technical parameters: surface wind speed, resistance, and overall dimensions; d) Manufacturing date;
e) Product number
9.2 Each fume hood shall have a trademark affixed in an obvious position. 726
Factory inspection
Unit
Number of unqualified judgments R
1
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