JB/T 7375-1994 Technical requirements for pneumatic oil mist eliminators
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T737594
Technical Conditions for Pneumatic Oil Mist
Published on July 26, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Pneumatic Oil Mist
1 Subject Content and Scope of Application
This standard specifies the technical requirements, test methods, inspection rules, and marking, packaging, and storage of oil misters. This standard applies to oil misters that atomize lubricating oil and mix it into compressed air. 2 Reference Standards
GB2346
Hydraulic and Pneumatic Systems and Components-Nominal Pressure Series JB/T6378 Technical Conditions for Pneumatic Directional Valves
3 Terminology
Oil mister: A pneumatic component that controls the atomization of lubricating oil and mixes it into the compressed air flow. 4 Specifications
Specifications are classified by diameter and shall comply with the provisions of Table 1. Table 1
Nominal diameter d
English in
5 Technical requirements
5.1 Working conditions
5.1.1 Working medium
Filtered clean compressed air.
5.1.2 Medium humidity and ambient temperature
The medium temperature and ambient temperature are both 5～60℃. 5.1.3 Nominal pressure
The nominal pressure of the oil mist device is 0.63, 1.00, 1.60MPa. 5.2 Performance requirements
5.2.1 Sealing
Under the nominal pressure, the oil mist device should have no external leakage. 5.2.2 Pressure resistance
Under 1.5 times the nominal pressure, any parts (components) of the oil calculator should have no damage and permanent deformation. 5.2.3 Pressure drop - air flow
JB/T7375-94
M27×2
M33×2
The air flow of the oil pump at various inlet pressures is shown in Table 2, and the value should be measured when the pressure drop is 5% of the inlet pressure. Its parameter values are divided into two grades, A and B. Products are tested according to the specified grades and shall not be less than the specified values in Table 2. Approved by the Ministry of Machinery Industry on July 26, 1994
Implementation on July 1, 1995
Inlet pressure
JB/T 7375 94
Pressure drop-air flow (under standard conditions) A
Note: The flow parameters for inlet pressure greater than 1.00MPa are given by the manufacturer. 5.2.4 Misting flow
The oil mist device produces an air flow of 5 drops of oil per minute under various inlet pressures. Its parameter values are divided into two grades, A and B. Products are tested according to the specified grades and shall not be greater than the provisions in Table 3. Table 3
Nominal diameter d
Inlet pressure
Note: ①The kinematic viscosity of the lubricating oil should be 17~23 (est), 10
Atomizing flow rate (under standard conditions)
②The atomizing flow rate parameters when the inlet pressure is greater than 1.00MPa are given by the manufacturer, 5.2.5Regulation of the lubricating oil dripping base
The inlet pressure of the oil mist device is 0.63MPa, and the outlet is connected to a constant throttle hole. The amount of lubricating oil dripping should be evenly adjustable and can be closed, and there is a visual indicator for dripping oil,
5.2.6Oil filling
The oil filling method of the oil mist device can be divided into two types according to its structure: non-stop gas injection and gas injection. For the oil mist device with non-stop gas injection structure, no oil drops should be discharged from the oil filling port during oil filling. 5.2.7 Durability
After the durability of the oil mist device meets the requirements of Table 4, the indicators shall still meet the requirements of 5.2.1.5.2.5. Table 4
Nominal diameter 4
5.2.8 Appearance quality
The surface coating of the oil mist device shall be uniform in color. There shall be no defects such as blistering and residue. 15
The plastic water storage cup shall not have the pattern that affects the transparency, no bubbles and other debris, and the label shall be clear without peeling and warping. 2
6 Test method
6.1 Test conditions
6.1.1 Test medium
JB/T 737594
Compressed air treated by a filter with a filtration degree of not less than 75um and a water separation efficiency of not less than 80%6.1.2 Ambient temperature
Ambient temperature 5~40℃,
6.1.3 Relative humidity
Relative humidity of surrounding air ≤90%.
6.1.4 Test pressure
Test pressure shall be as specified in Table 5.
Nominal pressure MPa
Pressure resistance
Sealing
Pressure drop-air flow
Mist flow
Lubricating oil dripping amount adjustment
Permanence
Allowable fluctuation value of standard pressure
6.1.5 Test instrument accuracy
0.40,0. 63
0.25,0. 40
1.5 times displacement pressure
Nominal pressure
0. 63,1.00
0. 63 1.00, 1.60
0. 63. 1.00
The accuracy of the pressure gauge used in the test is specified to be not less than 0.4 level for type test and not less than 2.5 level for factory test. The upper limit of the measuring range shall not be greater than 2 times of the test pressure: the flow meter shall not be less than 2.5 level; the thermometer (meter) shall be of ordinary level. 6.2 Performance test
6.2.1 Sealing performance test
Block the outlet of the oil mist device, test the pressure as specified in Table 5, put it in water, and test the time for 10s. 6.2.2 Pressure resistance performance test
Block the outlet of the oil mist device, test the pressure as specified in Table 5, and check after 1min of pressure resistance. 6.2.3 Pressure drop-air flow
The test is connected back to Figure 1, and the pressure port is specified in Figure 2: Figure 1 Pressure drop-air flow test circuit source diagram 1 Air retreat: 2-air decompression reading; 3.5-pressure gauge 14-measured calculator: 6-throttle valve; 7-flow meter 3
JB/T 7375-94
The iris hole shall not have protrusions and hairy
Figure 2 Pressure port structure
The test pressure shall be in accordance with the provisions of Table 5, and shall be kept constant during the test. The throttling width shall be adjusted to gradually increase the flow rate. When the outlet pressure drops b.
to 5% of the inlet pressure, measure the air flow rate; c.
Repeat three times and take the average value.
Fog flow test
The test circuit shall be in accordance with Figure 1:
The kinematic viscosity of the lubricating oil shall be selected within the range of 17 to 23cst, and the oil injection amount shall be 10% of the effective volume above the lowest oil level. Adjust the oil needle to the best position:
The test pressure shall be in accordance with the provisions of Table 5, and then gradually adjust the throttling opening. When 5 drops of oil are uniformly produced per minute, measure the air flow and repeat three times to take the average value.
6.2.5 Lubricating oil dripping amount adjustment test
The test circuit is as shown in Figure 3. The constant throttle hole is as specified in Table 6 and Figure 4; Figure 3 Schematic diagram of lubricating oil dripping amount test circuit Gas source: 2-cut-off reading: 3-pressure reduction reading: 4-pressure gauge + 5-tested oil mist device: 6-constant throttle hole Table 6
Nominal diameter
Constant throttle hole diameter
Constant throttle hole structure
The lubricating oil level is at the normal working oil level; the test pressure is as specified in Table 5:
Adjust the oil mist device to adjust the oil needle for detection. 6.2.6 Oil filling test
Block the outlet of the oil mist device:
The test pressure is as specified in Table 5;
JB/T7375-94
Open the non-stop gas refueling screw plug to refuel and check. Durability
Test circuit is as specified in Figure 5;www.bzxz.net
Figure 5 Schematic diagram of durability test circuit
1-air source; 2-air pressure relief valve: 3-tested oil and other devices: 4-digital counter + 5-opening and closing valve b. Test pressure is as specified in Table 5, adjust the oil needle to close the oil circuit, and make the opening and closing valve switch at a rate of 1Hz: After the durability of the oil mist device meets the requirements of Table 4, the indicators should still meet the requirements of 6.2.1.6.2.5. 6.3 Appearance quality inspection
Appearance quality inspection adopts visual inspection method.
7 Inspection rules
7.1 Factory inspection
7.1.1 Each oil mist device must be inspected and qualified by the factory inspection department before it can be shipped, and a certificate of conformity shall be attached. 7.1.2 Factory mandatory inspection items 5.2.1, 5.2.5.5.2.8. 7.1.3 Factory inspection items 5.2.2.
7.1.4 The number of inspections should be 2% of the output of each batch (natural batch), but not less than 3 units. 7.1.5 Judgment rules
According to the provisions of Article 6.1.4 of JB/T6378.
7.2 Type inspection
When any of the following situations occurs, the product shall be subject to type inspection: when a new product is trial-produced or an old product is transferred to another factory for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; during normal production, regular inspections shall be conducted, not less than once every three years; when the product is resumed after one year of suspension of production: when the inspection results differ significantly from the last type inspection: t.
When the national quality supervision agency proposes a requirement for type inspection. 7.2.2 The number of pneumatic components for type inspection is stipulated to be 3 units (pieces). One unit (piece) is subject to full-item testing, and the rest are subject to performance testing only. If there are unqualified items in the test, the tested piece shall be double inspected. If there are still unqualified ones, the type inspection of the pneumatic component shall be unqualified. 8 Marking, packaging, storage
8.1 Marking
The outer surface of the oil mist device should be marked with:
Product name, model, specification;
Nominal pressure;
Flow direction;
Thread mark of the pipe:
Manufacturer name:
Date of manufacture.
8.2 Packaging
8.2.1 Inner packaging
JB/T 7375-94
Material such as paper box, polyethylene blown film for packaging, polyethylene air cushion film, polystyrene foam plastic should be used. Pack in plastic bags, with each component (set) packed in one bag, and fold the bag mouth. b.
Packed in cartons: 1, 2 or 5 bags per box, c.
8.2.2 Outer packaging
The outer packaging of the components shall be made of corrugated boxes, calcium plastic corrugated boxes or nailboard boxes. The outer packaging with special requirements shall be agreed upon by the supply and demand parties. 8.3 Storage
Each oil mist generator shall be stored in a warehouse with an air temperature of 5-40C and a relative humidity of no more than 80%. The air in the warehouse shall not contain abrasive harmful impurities.
Additional instructions:
This standard was proposed and managed by the Wuxi Pneumatic Technology Research Institute of the Ministry of Machinery and Horizontal Industry. This standard was drafted by Shanghai Pneumatic Complete Set Co., Ltd. and Wuxi Pneumatic Technology Research Institute. The main drafters of this standard are Zou Zongfa and Zhang Jiansong. 6
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.