Series standard and line diameter of O type ring for automobile special import
The O type ring is a standard piece. It is widely used. In the process of development, it has gradually formed the standards of various countries.
The representative of the following are the following:
The 1/ standard is divided into old and new national standard GB, GB is to old O-ring diameter * wire diameter to represent the new national standard to the inner diameter of the rubber ring; * diameter represented by the current domestic enterprises mainly in the new national standard.
Old national standard: the national standard GB1235-76--- line diameter is: 1.9, 2.4, 3.1, 3.5, 5.7, 8.6;
New national standard: the national standard GB3452.1-92--- line diameter is: 1.8, 2.65, 3.55, 5.3, 7;
2/ daily standard JIS B2401--- line diameter is: 1.9, 2.4, 3.1, 3.5, 5.7, 8.4;
The R--- line diameter of the 3/ method was 1.90, 2.70, 3.60, 5.33 and 6.99.
4/ American Standard AS568A, British standard BS 1806--- wire diameter: 1.78, 2.62, 3.53, 5.33, 6.99;
5/ de standard DIN3771 GB3452.1-92--- line diameter is: 1.80, 2.65, 3.55, 5.30, 7;
6/ BS standard BS 4518 Rui standard SMS 1586--- line diameter: 1.6, 2.4, 3, 5.7, 8.4.
Two, automobile air conditioning O rubber seal
test method
Test method for refrigerant resistant and refrigerant resistant and PAG mixture
(1) experimental equipment
A. thermal aging test box
B. resistant refrigerant and refrigerant resistant and PAG mixture test equipment require pressure of the container to be more than 5000kPa.
(2) sample
The sample is the 2 type dumbbell sample of GB/T 528 and the sample of 25mm*50mm*2mm specified by GB/T 1690.
(3) experimental conditions
The test temperature is (70 + 2), and the test time is 72h
(4) test procedure
A. called the test required PAG oil into the experimental container, such as the simple refrigerant test without this step.
B. put the prepared sample into the container and seal the container. The refrigerant is quickly added to the refrigerant, for example, the test of the mixture should be made after the weight of the refrigerant is added, so that the sample is completely immersed in the refrigerant or mixed liquid, and the container is placed in the aging box with test temperature and temperature.
(5) experimental results
The hardness change, tensile strength change, tensile strength change rate, elongation at break rate and volume change were measured by GB/T 1690.
Three. Storage, handling and installation of O type ring seals for automobile special import
If the seal ring is damaged, it will affect its service life. In order to avoid damage to the sealing ring before installation and installation, we must carefully store and transport the rotary shaft lip seal, and install and store it properly.
The sealing ring should be properly stored, because the storage will affect the performance of the sealing ring and directly affect the life of the bearing and other valuable machinery parts. The danger of sealing ring in storage may be: A. temperature B. humidity C. radioactive material D. smog E. insect F. rodents g. dust h. sand I. mechanical damage
The storage site should ensure that the temperature is between 10~25 and 40%~70%. at the average humidity.
For inventory turnover, the sealing ring should be stored in accordance with the principle of "first in and out".
In order to delay ozone aging, the sealing ring should avoid direct or reflected sunlight, and should be far away from any equipment that can produce ozone.
In order to prevent the aging of the sealing ring material, the sealing ring should avoid the damage of radioactive material and smoke.
The sealing ring should avoid the invasion of insects and rodents
The sealing ring should be stored in a non operating area to avoid mechanical damage caused by the equipment or the whereabouts. A closed packing box can prevent mechanical damage and dust. Sand and other pollutants.
When the cartons with sealing rings are stacked, the damage to the bottom seal should be avoided due to overweight.
Four. Market of rubber seal special-shaped parts
The application of rubber seal is very extensive, in addition to the commonly used hydraulic & pneumatic systems, all kinds of pipelines, buildings and roads, the car outside, are also often used on other occasions, and our main products are: O ring, star ring, oil seal, combination washer, flat gasket, rubber ball, Bingley ring, stepseal, rubber tube, rubber strip, rubber seal ring, etc. these and many special parts can be customized. Many rubber sealing products, because of the wide range of applications, have not yet formulated national standards and industry standards, so many products and special-shaped parts must be provided with drawings for our technical price. Although most of the seals have their standard specifications, specialties in the rubber seal industry also account for a large market. Therefore, our company is also very concerned about this aspect, and the production in this area is also very rigorous.
Design specification for skeleton oil seal
GB/T 9877 - 2008 "hydraulic rotary shaft lip seal design specifications" provisions of the basic requirements of rotary shaft lip seal ring structure design, the design requirements of assembly series of supporting parts, including the basic size of rotary shaft lip seal ring GB/T 13871.1 main lip, lip, side skeleton, spring and size. In addition, the main parameters of the conventional design and the special design parameters (such as the design of the lip reflux form, etc.) are also given. A rotating shaft lip seal, which is applied to the rotating shaft end of the equipment, and seals the liquid or grease. The pressure of the sealing cavity is not more than 0.05MPa