oil seal manufacture in wonepart with different types
Oil-seal-manufacture-in-wonepart-with-different-types
The key function of the sealing ring is to protect the grease, so that the components that must be lubricated in the transmission components and the mechanical energy components protect each other. The mechanical seal refers to the device that processes the sealing relationship between the driving force cardiomyocytes and the arc. The skeleton oil seal is a category typical of the seal ring, which means a commodity. Usually, when talking about the seal ring, these "heavy-weight" skeleton oil seals are always thought of. In short, the skeleton diagram refers to the key construction of the supporting points and determination of the sealing ring, which can improve the actual sealing effect of the sealing ring, so that the sealing ring can maintain the appearance and excellent supporting force. According to the structure of the seal ring, the skeleton oil seal can be divided into a single-lip skeleton oil seal and a lip skeleton oil seal.
This article mainly introduces the lip skeleton oil seal in detail. The secondary lip in the lip skeleton oil seal can have anti-fouling effect. In simple terms, it means to protect the outside dust and residues from entering the equipment and endanger all normal operation of the equipment.
According to the skeleton diagram method, it can be divided into inner skeleton oil seal and exposed skeleton oil seal. In different work, the standard can distinguish two types of rotary skeleton oil seal and back and forth skeleton oil seal. For different applications, people must choose the type of skeleton oil seal that people must .
However, in terms of high cost performance, the skeleton oil seal is cost-effective in short-term application, but the application is short-lived. Under the load of continuous safe operation, it is not suitable to choose the skeleton oil seal. Compared with the traditional mechanical seal, the structure of the mechanical seal is more serious. It is meticulous and suitable for long-term applications. Both the shaft and the shaft sleeve are not easily damaged. It is not sensitive to the vibration and deflection of the circular arc and the shaft is not sensitive to the inclination of the sealed cavity. The fluctuation is strong, it is reliable, and the operation period is long. ; Wide application areas. However, many projects have high investment, time-consuming labor, and high installation precision requirements; production and processing have high precision requirements, production and processing are complicated, and installation specifications are large.
Before purchasing a skeleton oil seal, check the appearance of the skeleton oil seal. The surface of the seal ring must be smooth and free of shortcomings such as burrs, cracks, bubbles, missing corners and residues; the edge of the oil protection lip is obtuse, without gaps, burrs and Problems such as unevenness; the total width of the contact between the skirt and the shaft is usually 0.13 ~ 0.6 mm, preferably the total width is 0.1 mm; the adhesion of the vulcanized rubber and the lifting ring should be inseparable without loosening, and the lifting ring is not allowed to be offset. The inner and outer surface layers are not exposed to iron; the embossed words on the plan view of the seal ring indicate "shaft diameter × diameter × aspect ratio", the name of the manufacturer and the trademark logo, and the ink should be clear.
Secondly, use a micrometer to accurately measure the specifications of the sealing ring. It is best to use a standard plug gauge to measure the nominal diameter to check whether the tightness is appropriate. If the nominal diameter of the sealing ring exceeds 40～95mm, the dimensional tolerance is -1.3～+0.6mm; if the aspect ratio exceeds 4mm, the dimensional tolerance is -0.4～+0.40mm. According to the requirements and standards, the oil resistance performance test can be carried out. When soaking in the 20# transmission oil at (75±5)℃ for 28h, the net weight change should be -3%～+5%; at (30±5)℃ the 130# After soaking in a solution of motor gasoline (70%) and benzene (20%) for 28 hours, the net weight change cannot exceed +30%. According to the manufacturer's regulations, the clearance fit between the tooth surface of the seal ring and the motor shaft should be moderate. Excessive communication will endanger its service life, and if it is too small, the sealing performance will be worse.
Introduction of skeleton rubber oil seal:
The skeleton rubber oil seal is also a kind of skeleton oil seal. Its material is rubber material, including silicone rubber material, fluorine rubber, EPDM material, PVC material, etc.
What should be paid attention to when installing the skeleton rubber oil seal?
1. Receive the number of oil seals used.
2. From the skeleton seal to the installation, it must be clean.
3. Before installation, strengthen the skeleton seal inspection, and measure whether the specifications of each position of the skeleton seal are consistent with the specifications of the shaft and waveguide. Before installing the skeleton seal, compare the shaft diameter specifications with the diameter specifications of the skeleton seal clearly. The specifications in the cavity should be suitable for the total diameter and width of the skeleton seal. Check that the lip of the skeleton seal is damaged or deformed, and what has fallen off or rusted. Avoid damage to the frame seal without placing it in the transportation process, being lightly pressed by inertial force and collision, and destroying its roundness.
4. Do a good job of machining inspection data before parts processing, and measure whether the specifications of each part of the cavity and the shaft are reasonable, especially the internal rounding, and there must be no inclination. The shaft and the inner hole of the waveguide must be extruded. Smooth, without damage and burrs on the rounded corners. Clean the processing position of the parts. There should be no burrs, gravel, iron sand and other dirt in the part where the shaft is installed (rounded corners), which will cause the skeleton sealing lip to be curved. For damage, it is recommended to use angle r for the rounding position.
5. In terms of operating skills, you can feel for a while with your hands to see if it is smooth and round.
6. It is not necessary to tear off the packaging bag prematurely before the frame seal is installed to prevent dirt from adhering to the frame seal surface and bring it to the work.
7. Before building the machine, the frame seal should be properly wiped and smeared with lithium-based ester with tungsten disulfide in the middle of the lip to prevent the shaft from starting cold in an instant, causing polishing conditions on the skirt, and jeopardizing the clearance of the lip. , And parts should be processed as early as possible. Install the frame seal seat for the frame seal. If you are building the machine immediately, it is recommended to cover it with a cloth to prevent dirt from adhering to the frame seal. Grease hands or work shells must be clean and tidy.
8. The seal of the skeleton should be installed flat, and there should be no skew. It is proposed to use steam pressure facility or bolted work shell connection. The air pressure does not need to be large, and the speed must be homogeneous and slow.
9. For the machine and equipment of the skeleton seal installed this time, mark it to facilitate tracking and pay attention to all the steps.
There are two cases for the sealing of the vacuum device. One is that the seal separates a container filled with liquid medium from the external vacuum space. In this case, the main function of the seal is to prevent the liquid medium from leaking into the vacuum space. Another situation is that the seal separates the vacuum inner cavity from the outer cavity, and its function is to maintain the required vacuum. This situation is more complicated, because even a slight leakage of the surrounding gaseous medium into the vacuum chamber will reduce its vacuum. If corrosive gas leaks in, the vacuum equipment may be damaged. In many cases, the degree of vacuum and the cleanliness of the vacuum space have a decisive influence on the quality of various processes under vacuum conditions. The mechanical seal used in the vacuum device has no special features in its structure. For the first case mentioned above, a metal bellows type single-end mechanical seal with good air tightness is usually used. In the second case, a double end face mechanical seal is used. If a single end face seal is used, there is bound to be a problem that the seal end face cannot be lubricated.
Generally, it is difficult for people to distinguish between mechanical seals and hydraulic seals, and they often think that they are the same thing.
1. Definition of mechanical seals and hydraulic seals:
Mechanical seals are one of the basic mechanical components with precision and complex structure, and are key components of various pumps, reaction synthesis kettles, turbo compressors, submersible motors and other equipment. Its sealing performance and service life depend on many factors, such as model selection, machine accuracy, correct installation and use, etc.
Hydraulic seals have pressure requirements and require a certain degree of smoothness on the joint surface. The sealing elements are mostly rubber, and the sealing effect is achieved through the local deformation of the seal.
2. Classification of mechanical seals and hydraulic seals
Mechanical seal model: cartridge seal series, light mechanical seal series, heavy mechanical seal series, etc.
Hydraulic seals: lip seals, V-shaped seals, U-shaped seals, Y-shaped seals, YX-shaped seals, and hydraulic cylinders. The commonly used combination seals are mainly lace rings, grid rings and ster seals.
Three, choose the seal
When purchasing seals for maintenance, most users will buy them according to the size and color of the sample, which will only increase the difficulty of purchasing, and it may not be possible to select the right product. The following procedures are recommended to improve the accuracy of procurement of seals:
1. Movement direction-first determine the movement direction of the location of the seal, such as reciprocating, rotating, spiral or fixed.
2. Sealing focus-for example, determine whether the active point is the tie rod seal with the inner diameter or the piston seal with the outer diameter.
3. Temperature grade-consult the original machine instructions or evaluate the working temperature according to the actual working environment to determine the materials needed. For the description of temperature levels, please refer to the following notes for production users.
4. Size-most users will choose the old samples that have been used, but after a period of use, the original size of the seal will be greatly affected by factors such as temperature, pressure and wear. The selection according to the sample can only be used as a reference , A better method is to measure the size of the metal groove where the seal is located, the accuracy will be higher.
5. Pressure level-refer to the relevant data from the original mechanical instructions, or infer the working pressure level by observing the hardness and structure of the original seal. For the pressure level description, please refer to the following notes for production users.
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