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GB/T 3821-2015: Small and medium power internal combustion engines -- Cleanliness limits and measurements
Status: Valid GB/T 3821: Evolution and historical versions
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Small and medium power internal combustion engines -- Cleanliness limits and measurements
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| GB/T 3821-2005 | English | 439 |
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Small and medium power internal combustion engine -- Cleanliness measurement
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| GB/T 3821-1983 | English | 199 |
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Determination of cleanliness for small and medium power internal combustion engines
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PDF similar to GB/T 3821-2015
Basic data | Standard ID | GB/T 3821-2015 (GB/T3821-2015) | | Description (Translated English) | Small and medium power internal combustion engines -- Cleanliness limits and measurements | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J91 | | Classification of International Standard | 27.020 | | Word Count Estimation | 17,175 | | Date of Issue | 2015-12-10 | | Date of Implementation | 2016-07-01 | | Older Standard (superseded by this standard) | GB/T 3821-2005 | | Quoted Standard | GB 1922-2006; GB/T 5330; GB/T 23338; ??JB/T 6002; JB/T 7661 | | Regulation (derived from) | National Standard Announcement 2015 No.38 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the medium power internal combustion engine (hereinafter referred to as internal combustion engine) cleanliness limits, measurement items and parts, measurement conditions, measurement method. This standard applies to internal combustion engines and machine parts. | GB/T 3821-2015: Small and medium power internal combustion engines -- Cleanliness limits and measurements
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Small and medium power internal combustion engines.Cleanliness limits and measurements
ICS 27.020
J91
National Standards of People's Republic of China
Replace GB/T 3821-2005
Small and medium power internal combustion engine cleanliness limit and determination method
Released on December 10,.2015
2016-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 3821-2005 "Measurement method for cleanliness of medium and small power internal combustion engines", compared with GB/T 3821-2005
The technical changes are as follows.
--- Increased demagnetization requirements for parts prior to cleanliness inspection (see 7.1.7);
--- Increased cleanliness quality and particle limit requirements (see Chapters 3, 4).
This standard was proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Internal Combustion Engine Standardization Technical Committee (SAC/TC177).
This standard was drafted. Weichai Power Co., Ltd., Shanghai Internal Combustion Engine Research Institute, Guangxi Yuchai Machinery Co., Ltd., Changchai
Co., Ltd., Kunming Yunnei Power Co., Ltd., Weichai Kaidong Power Machinery Co., Ltd., Ningbo Xuelong Group Fan Co., Ltd.
The main drafters of this standard. Wang Jianping, Ji Weibin, Luo Zhijian, Dai Weilin, Yan Dehui, Yang Chunliang, Tao Shouping, Chen Nianhong, Guo Hua,
Li Jianghu, Chen Lanlan, Yang Junjie, Meng Hongxia.
The previous versions of the standards replaced by this standard are.
---GB/T 3821-1983, GB/T 3821-2005.
Small and medium power internal combustion engine cleanliness limit and determination method
1 Scope
This standard specifies the limits of cleanliness of small and medium-sized internal combustion engines (hereinafter referred to as internal combustion engines), measurement items and locations, measurement conditions, and determination.
method.
This standard applies to the whole machine and parts of internal combustion engines.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB 1922-2006 Solvent oil for paints and cleaning
GB/T 5330 industrial wire braided square hole screen
GB/T 23338 internal combustion engine charge air cooler technical conditions
JB/T 6002 turbocharger cleanliness limit and method of determination
JB/T 7661 diesel engine oil pump nozzle product cleanliness limit and determination method
3 Cleanliness weight limit
3.1 Machine cleanliness
3.1.1 The cleanliness of the internal combustion engine is expressed in terms of each impurity mass W, and the limit is calculated according to formula (1).
W = aK1K2Peb G (1)
In the formula.
W --- Cleanliness limits for internal combustion engines in milligrams (mg);
a --- empirical constant, 13.6mg/kW;
K1---total displacement correction coefficient, the value is shown in Table 1;
K2---speed correction coefficient, the value is shown in Table 2;
Peb---calibrated power in kilowatts (kW);
G --- compensation amount, the unit is milligram (mg), the value is shown in Table 3.
Table 1
Total displacement Vb/L K1
≤0.5 1.0
>0.5~5 1.1
>5~100 1.2
Total displacement Vb/L K1
>100~150 1.3
>150 1.4
Table 2
Calibration speed neb/(r/min) K2
≤600 1.3
>600~1000 1.2
>1000~2000 1.1
Calibration speed neb/(r/min) K2
>2000~3000 1.0
>3000 0.9
table 3
Calibration power Peb/kW G/mg
≤3.68
50 (two strokes)
80 (four strokes)
>3.68~7.35 150
>7.35~14.7.200
Calibration power Peb/kW G/mg
>14.7~29.4 400~aPeb
>29.4~73.5 0
>73.5 500~0.5aPeb
3.1.2 The cleanliness of the whole engine of the internal combustion engine is calculated according to formula (2).
W =4.66iSD (2)
In the formula.
W --- Cleanliness limits for internal combustion engines in milligrams (mg);
i --- number of cylinders;
S --- piston travel of the internal combustion engine in centimeters (cm);
D --- Cylinder diameter of the internal combustion engine in centimeters (cm).
3.2 Assembly cleanliness
3.2.1 Carburetor assembly
The cleanliness of the carburetor assembly is expressed in terms of each impurity mass WH (mg), and the limit is calculated according to formula (3).
WH=a KV G (3)
In the formula.
a --- empirical constant, 10mg;
K---volume correction factor, the unit is milligrams per cubic centimeter (mg/cm3), the values are shown in Table 4;
V --- carburetor volume, in cubic centimeters (cm3), measured by volumetric method;
G --- compensation amount, the unit is milligram (mg), the value is shown in Table 5.
Table 4
Carburetor volume V/cm3 K/(mg/cm3)
≤50 0.00
>50 0.05
table 5
Carburetor use G/mg
General small gasoline engine with 4.00
Motorcycle, boat machine 7.00
Note. The compensation amount of various matching carburetor is based on low value.
3.2.2 oil pump assembly
The cleanliness of the oil pump assembly is expressed in terms of each mass of WJ (mg).
When the oil pump displacement q ≤ 0.005L, the limit is 20mg;
When the oil pump displacement q >0.005L, the limit is calculated according to formula (4).
WJ=a bKq (4)
In the formula.
a --- empirical constant, 10mg;
b --- empirical constant, 2 × 103 mg/L;
K---Material correction coefficient, the value is shown in Table 6;
q --- Oil pump displacement in liters (L).
See Appendix A for the calculation formula of the oil pump displacement.
Table 6
Pump material K
Cast iron 1.0
Cast aluminum
Casting 0.9
Die casting 0.6
Note. For the oil pump installed inside the internal combustion engine, the limit of the external surface cleanliness of the assembly is determined by the OEM and the accessory factory.
3.2.3 Turbocharger
The cleanliness limits for turbochargers are specified in JB/T 6002.
3.2.4 oil pump nozzle
The cleanliness limit of the diesel oil pump nozzle is specified in JB/T 7661.
3.2.5 Oil filter assembly
3.2.5.1 Wire-wound, blade-type, paper, linoleum filter oil filter assembly cleanliness is expressed in WR1 (mg) per mass, limit
Equation (5) calculation.
WR1=aKQ (5)
In the formula.
a --- empirical constant, the unit is milligrams per liter (mg · min/L), the values are shown in Table 7;
K---material correction coefficient, the value is shown in Table 8;
Q ---rated flow in liters per minute (L/min).
Table 7
Filter rated flow Q/(L/min) a/(mg · min/L)
< 14 4.4
≥14 3.0
Table 8
Filter material K
Cast iron 1.0
Cast aluminum 0.9
3.2.5.2 Centrifugal oil filter assembly cleanliness, expressed in WR2 (mg) per mass, see Table 9 for limits.
Table 9
Rotor inner diameter d/mm
WR2/mg
Cast iron filter seat cast aluminum filter seat
≤100 120 108
>100 150 135
3.2.6 Air compressor assembly
The cleanliness of the air compressor assembly is expressed in WK (mg) per mass, and the limit is calculated according to formula (6).
WK=a(K1K2K3 b) (6)
In the formula.
a --- empirical constant, 50mg;
K1--- total displacement correction coefficient, the value is shown in Table 10;
K2---Material correction coefficient, the values are shown in Table 11;
K3---Crankshaft end transmission mode correction factor, the value is shown in Table 12;
b --- The number of drive pairs on the drive shaft.
Table 10
Air compressor total displacement Vk/L K1
≤0.10 4
>0.10~0.15 5
Air compressor total displacement Vk/L K1
>0.15~0.20 6
>0.20 7
Table 11
Crankcase material K2
Cast iron 1.0
Cast aluminum 0.9
Table 12
Crankshaft end drive mode K3
Belt drive 1.0
gear drive
1.1 (excluding gears)
1.2 (including gears)
3.2.7 oil cooler assembly
The cleanliness of the oil cooler assembly is expressed in WL (mg) per impurity, and the limit is calculated according to equation (7).
WL=a bF0 (7)
In the formula.
a --- empirical constant, the unit is milligram (mg), the value is shown in Table 13;
b --- empirical constant, the unit is milligrams per square meter (mg/m2), the values are shown in Table 13;
F0---oil side heat transfer area in square meters (m2).
Table 13
Type a/mg b/(mg/m2)
Plate fin type 7 10
Shell and tube type 43 76
3.2.8 Charge air cooler assembly
The charge air cooler is specified in GB/T 23338.
3.3 Main parts cleanliness limits
The cleanliness limits for major parts are specified in Table 14. The cleanliness limits for other parts of the internal combustion engine that do not have specified limits are subject to the supply agreement.
The standard is executed.
Table 14
Serial number name (piece) limit/mg
1 cylinder head 0.48iD
2 body 1.62D
3 crankshaft 0.14iD
4 camshaft 3.5i
5 rocker shaft 6i
6 rocker seat 12
7 rocker 7
8 oil filter seat 22
9 gear 12
Table 14 (continued)
Serial number name (piece) limit/mg
10 gear chamber cover 12
11 cylinder liner 10
12 valve tappet 12
13 valve stem 17
14 high pressure oil pipe 2.5l
15 cylinder head cover 14i
16 piston 14
17 piston ring 5
18 link 35
19 main bearing bush and connecting rod bearing bush 4
20 diesel filter 6
21 fuel filter 6
22 oil sump 0.06iD
23 intake pipe (including manifold) 0.06iD
24 exhaust pipe 0.12iD
Note. D is the cylinder bore of the internal combustion engine, the unit is millimeter (mm); i is the number of cylinders of the internal combustion engine; l is the length of the high pressure fuel pipe, the unit is meter (m).
4 Cleanliness particle limits
The cleanliness particle limit of the internal combustion engine, the parts before the filter shall not exceed 800μm, and the parts after the filter (including the filter) shall not be larger than
600 μm.
5 Determination conditions
5.1 Measuring instruments and cleaning fluids
5.1.1 Filter elements
5.1.1.1 Filter
The micropore filter has a difference of not more than 0.4 mg twice. The specifications are as follows.
a) 4.5μm microporous membrane, when the cleanliness requirement of the parts is not more than 5mg, filter the sample for testing;
b) 5μm microporous membrane filter, when the component cleanliness requirement is greater than 5mg, filter the sample for testing.
5.1.1.2 Filter
The filter size is 430 mesh, the material is stainless steel wire, and meets the requirements of GB/T 5330.
5.1.1.3 Vacuum pump and membrane filtration device
Vacuum pump (vacuum degree 80kPa), filter membrane filter device consists of funnel, funnel seat, metal frame, rubber stopper, suction filter bottle, its connection form
see picture 1.
Description.
1---funnel;
2---filter membrane;
3---Funnel seat;
4---rubber plug;
5--- suction filter bottle;
6---metal frame;
7---connecting pipe;
8---Connected to the vacuum pump.
Figure 1 Schematic diagram of filter membrane filtration device
5.1.2 Cleaning fluid
5.1.2.1 The cleaning solution should be cleaned before use. The cleanliness of 400mL cleaning solution is not more than 1mg.
5.1.2.2 No. 2 solvent oil (oxygen-free hydrocarbon cleaning agent) specified in GB 1922-2006.
5.1.2.3 90% industrial ethanol.
5.1.3 Appliances and devices
5.1.3.1 Disassembly equipment and tools
Special equipment such as cranes and flip racks, as well as general disassembly equipment and tools.
5.1.3.2 Cleaning equipment and tools
Cleaning equipment and tools include.
a) Nylon round brushes, flat brushes, etc. of various sizes, all brushes should be white and cleaned in the cleaning solution before use, cleaning
The diameter of the round brush of the hole should be larger than the diameter of the hole to be cleaned;
b) cleaning bottles and syringes, etc.;
c) containers of different sizes of basins and buckets with lids;
d) magnet;
e) a flat, toothless tweezers;
f) The whole machine and heavier parts and assemblies shall be equipped with special cleaning equipment that can be rotated;
g) Pressure washer (pressure is.200kPa~250kPa), as shown in Figure 2.
Description.
1 --- air compressor;
2, 5--- connecting pipe;
3 --- air filter;
4 --- pressure gauge;
6 --- spray gun;
7 ---Liquid tank.
Figure 2 Schematic diagram of the pressure washer
All cleaning devices are covered with a cover when they are not in use unless they are placed separately in a closed room.
5.1.3.3 Drying equipment
Oven, dryer.
5.1.3.4 Analytical equipment
The instrument and equipment for inspection and analysis shall meet the requirements for metrological verification and shall be within the validity period. Analytical equipment includes.
a) Analytical balance with an accuracy of 10-4g;
b) scale microscope with a magnification greater than 40 times;
c) 40 cm x 40 cm square glass or microscope carrier glass piece.
5.2 Working environment
5.2.1 Cleanliness inspection should be set up with a special inspection room. The room is divided into operation rooms such as disintegration, cleaning, filtration, drying, weighing and analysis.
The recommended layout is shown in Figure 3.
Description.
1---disintegration and large-size cleaning room;
2---small cleaning room;
3---filter room;
4---drying, weighing, and analysis;
5---sample display room.
Figure 3 Cleanliness inspection room floor plan (recommended)
5.2.2 The cleanliness inspection room shall have good dustproof measures, and the indoor dust reduction amount shall not exceed 40 mg/m2 (the sampling part is for each work).
Platform level). See Appendix B for the method of measuring indoor dustfall.
5.2.3 The test chamber should be dry and ventilated, and the room temperature should be kept at 15 °C ~ 30 °C.
5.2.4 There must be strict fire prevention measures in the cleaning room.
6 Measurement items and parts
6.1 Machine
The measurement items and parts of the whole machine shall comply with the provisions of Table 15; the items and parts of the whole machine disassembly test are shown in Appendix C.
Table 15
Serial number part
1 inner surface of oil sump (including magnetic screw surface)
2 Oil strainer assembly all parts surface (except the outer surface of the assembly)
3 oil fine filter assembly all parts surface (except the outer surface of the assembly)
4 oil oil (including oil pan, oil, fine filter and oil cooler, etc.)
6.2 Parts and components (assembly)
6.2.1 Parts
The measurement location of the part shall comply with the requirements of Table 16.
Table 16
Serial number part
1 All internal surfaces of the cylinder head (except water passages and screw holes), including air passages, oil passages and combustion chambers
2 All internal surfaces of the body (except waterways and screw holes), including air passages and oil passages
3 All surfaces of the crankshaft (except flanges) and oil passages
4 camshaft all surfaces and oil passages
5 rocker shaft all surfaces and oil passages
6 rocker seat all surfaces and oil passages
7 rocker arm all surfaces, oil passages and threaded holes
8 oil filter seat inner surface
9 gears all surfaces
10 gear chamber cover all inner surfaces
11 Cylinder liner bore surface
12 valve tappet all surfaces
13 valve stem all surfaces
14 high pressure tubing all internal surfaces
15 cylinder head cover inner surface
Table 16 (continued)
Serial number part
16 piston all surfaces and tunnels
17 piston ring all surfaces
18 links all surfaces and tunnels
19 All surfaces of the main bearing bush and connecting rod bearing
20 diesel filter inner surface
21 fuel filter inner surface
22 oil pan inner surface
23 intake pipe (including manifold) inner surface
24 exhaust pipe inner surface
6.2.2 Parts (Assembly)
The measurement site after disassembly of the assembly shall comply with the requirements of Table 17.
Table 17
Serial number part
1 Fuel gross filter and fine filter assembly all parts surface (except for the outer surface of the assembly)
2 carburetor assembly all parts surface (except the outer surface of the assembly)
3 All parts of the fuel injection pump assembly (except for the outer surface of the assembly)
4 oil pump assembly all parts surface (except the outer surface of the assembly)
5 Injector assembly all parts surface (except for the outer surface of the assembly)
6 Oil strainer and fine filter assembly all parts surface (except the outer surface of the assembly)
7 Air compressor assembly crankcase inner surface and oil passage
8 oil radiator (cooler) contact with lubricating oil surface and oil passage
9 oil filter assembly assembly all surface
10 oil gauge assembly outer surface
11 supercharger inlet pipe assembly inner surface
Note. Pressure fittings and non-removable connectors are not disassembled.
7 Determination method
7.1 Inspection preparation
7.1.1 Staff should wear clean overalls, caps and shoes and wash hands.
7.1.2 Clean the non-inspected parts of the parts.
7.1.3 Clean all sampling tools, brackets and containers.
7.1.4 Filter the cleaning solution with a 4.5μm or 5μm filter.
7.1.5 The filter screen is placed in the cleaning solution for 10 minutes and then taken out. After the cleaning solution is volatilized, it is placed in an oven at 105 °C ± 5 °C.
After 60 min, it was taken out in a dry box and cooled for 30 min, and then weighed for use.
7.1.6 Put the filter into the weighing bottle with tweezers, put the half-open cover into the oven that has been heated at 90 °C ± 5 °C, take it out after 60 min, and place it in the dry
After cooling for 30 minutes in the dry box, weigh it for use. (If necessary, use multiple filters to dry and weigh together, but each weighing bottle should not exceed
3 sheets, the filter membranes are required to be staggered from each other), and the difference between the weighing of the filter and the drying of the filter is not more than 0.4 mg.
7.1.7 The parts to be inspected shall be demagnetized before cleaning. The residual magnetism of the fuel system parts shall not exceed 5×10-4T, and the remanence of other parts
The amount is not more than 1.5×10-3T.
7.2 Operation steps
7.2.1 Parts and components (assembly)
7.2.1.1 The measurement of the cleanliness of parts and components (assembly) includes sampling, disassembly, cleaning, filtration, drying, analysis, etc.
The sequence is shown in Figure 4.
Figure 4 Cleanliness inspection work program diagram
7.2.1.2 Sampling. According to the sampling method specified by the enterprise.
7.2.1.3 Disintegration. Disassemble the assembly that requires disintegration as specified in Chapter 6. Avoid scratching and bumping parts during the disintegration process.
Collecting and processing foreign matter obtained in the process of disintegration that is not within the cleanliness assessment range (damaged paper pad and metal scraps scraped off by spring washers, etc.).
After the parts to be inspected are numbered, they are placed on special equipment for cleaning.
7.2.1.4 Cleaning. According to the shape and size of the parts and assemblies, use a syringe, nylon brush and solvent oil (usually 50kPa).
Flush the surface to be tested. For deep holes, conduits, and inner surfaces of castings, use 100 mL to 150 kPa of pressurized solvent oil.
7.2.1.5 Clean all the metal impurities in the non-through holes, remove them all (such as magnets to remove iron filings, etc.) and count the impurities.
7.2.1.6 When flushing with various appliances, the cleaning solution with impurities should be prevented from splashing out of the container and all cleaning liquid with impurities should be collected.
7.2.1.7 Parts or parts that are not suitable for cleaning with solvent oil during cleaning are cleaned with 90% ethanol, but it should be noted that the two cleaning solutions are not
Use it at the same time and prevent accidents.
7.2.1.8 Filtration. The entire cleaning solution is coarsely filtered with a strainer to initially collect impurities; then vacuum filtration is performed using a filter membrane. Collect all impurities (package
Including metal impurities such as iron filings, non-metallic particles falling from inspection tools such as brushes should be removed.
7.2.1.9 Drying. Wash the oil on the filter with the cleaning solution, put the filter together with the filtered impurities into the weighing bottle, and make the cap open halfway.
It was taken out in an oven at 90 ° C ± 5 ° C for 60 min, and cooled in a desiccator for 30 min; the oil on the filter screen was washed with a cleaning solution.
It was taken out in an oven at 150 ° C ± 5 ° C for 60 min and cooled in a desiccator for 30 min.
7.2.1.10 Weighing. Weigh and dry the wire filter and the weighing bottle with the impurity filter on the balance, the reading is accurate
To 0.1mg.
7.2.1.11 Particle detection. The maximum particle size (length x width, μm x μm) in the impurities was examined by microscopy and filled in Table 18.
7.2.1.12 Analysis. analysis of impurity components (only metal impurities are required to be taken out); and 40 cm × 40 cm square glass or microscope carrier glass
The granules crush the granules to determine their hardness.
The mass of the impurities was calculated according to the formula (8), and the results were filled in Table 18.
W =(G2-G1) (G4-G3) G5 (8)
In the formula.
W --- impurity quality in milligrams (mg);
G1 --- the mass of the filter before filtration, in milligrams (mg);
G2 --- filter mass after filtration, in milligrams (mg);
G3 --- The mass of the filter before filtration, in milligrams (mg);
G4 --- Filter quality after filtration in milligrams (mg);
G5 --- The mass of the remaining impurities (foreign matter), in milligrams (mg).
Table 18 Cleanliness Measurement Data Record Form
Product name review
Product model inspector
Oil grade
Filter element inspection date
Item measured value impurity
Filter membrane mass before filtration G1/mg
Filter quality G2/mg after filtration
Filter quality before filtration G3/mg
Impurity particle size (length × width, μm × μm)
Filtered filter quality G4/mg
Assembly of residual impurities (foreign matter) mass G5/mg
Impurity quality W/mg
Assembly remnants.
Note. The residual impurities (foreign matter) in the assembly refer to the fasteners such as nuts, wire, non-metallic objects, etc. left in the assembly during the assembly process.
The mass is taken into account for the total mass of the impurities.
7.2.2 Machine
7.2.2.1 For the whole machine that has been coated with anti-rust oil, whether the anti-rust oil should be cleaned or replaced before testing, can be according to the product manual.
Line processing. When adding oil according to the product manual, the mechanical impurities should meet the requirements of the corresponding standards, and run for 30 minutes.
The above measurement can be carried out only when the oil temperature reaches 65 °C (the two-stroke small gasoline engine can be measured after 30 minutes of hot operation).
7.2.2.2 Collect all oil in the oil pan, oil coarse, fine filter and oil radiator (cooler).
7.2.2.3 Disassemble the oil coarse and fine filter cover, remove the filter after disassembly (except for disassembly), immerse it in a container containing the cleaning solution, and
Flush the inner surface of the housing.
7.2.2.4 Clean the inner surface of the oil pan including the magnetic plug surface.
7.2.2.5 Collect all cleaning fluids with impurities.
7.2.2.6 Filter, dry, weigh, pellet and analyze according to 7.2.1.8~7.2.1.12.
Appendix A
(normative appendix)
Oil pump displacement calculation formula
The oil pump displacement q(L) is approximated by the formula (A.1) or the formula (A.2) (calculated to the nearest 0.0001).
External meshing involute gear pump.
q=π4
(D2e-D2i) B×10-6 (A.1)
Internal meshing involute gear pump.
q=π4
(ρ
1-ρ
2) B×10-6 (A.2)
In the formula.
De---the diameter of the tip circle, in millimeters (mm);
Di --- tooth root diameter, in millimeters (mm);
B --- tooth width in millimeters (mm);
Ρ1 --- inner rotor long diameter in millimeters (mm);
Ρ2 --- The inner rotor has a short diameter in millimeters (mm).
Appendix B
(normative appendix)
Indoor dustfall determination method
B.1 General
The method is applicable to the determination of dustfall in various operation rooms, working chambers, and impurity sample storage rooms.
The amount of dust in the room refers to the amount of dust that falls on the unit area of the designated part within a certain period of time (usually measured for 24 hours of dust reduction).
Expressed in mg/m2.
B.2 Equipment and equipment
B.2.1 White porcelain plate (300mm × 250mm) or glass plate.
B.2.2 Filter membrane filter. See 5.1.1.1.
B.3 Determination method
B.3.1 Sampling
B.3.1.1 Put the tested environment in a normal working state.
B.3.1.2 Place the white porcelain plate (one or more) coated with organic...
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