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Machine seal work should pay attention to problems, precautions during installation
a. Pay great attention to avoid the installation deviation caused by the installation. (1) The upper pressing cover should be carried out after the coupling is aligned. The bolt should be evenly supported to prevent the end face of the gland from being skewed. Check the points with a feeler gauge. The error is no more than 0.05 mm. (2) Check the fit clearance (ie, concentricity) between the gland and the outer diameter of the shaft or bushing. The circumference should be uniform. Check the tolerance of each point with a feeler gauge to be no more than 0.01 mm. b. The amount of spring compression should be carried out according to the regulations. It is not allowed to be too large or too small, and the required error is 2.00 mm. Over the assembly, the end face specific pressure is increased to accelerate the end face wear. Too small will cause insufficient specific pressure and will not seal. c. After the moving ring is installed, the moving ring should be able to spring back automatically after pressing the spring.
Precautions when disassembling
a. Care should be taken when installing and disassembling the mechanical seal. Do not use the hand hammer and the flat shovel to avoid damage to the sealing components. If the scale is not removed, it should be cleaned before disassembly. b. If mechanical seals are used on both ends of the pump, take care of each other during assembly and disassembly to prevent loss. c. For the mechanical seal that has been operated, if the gland is loose to move the seal, the static and dynamic ring parts must be replaced and should not be re-tightened for continued use. Because the original running track of the friction pair changes after loosening, the sealing of the contact surface is easily destroyed.
Machine seal normal operation and maintenance problems Preparation and precautions before starting
a. Thoroughly check the mechanical seal, and whether the attachments and pipelines are installed properly and meet the technical requirements. b. Perform a static pressure test before starting the mechanical seal to check for leaks in the mechanical seal. If there are more leaks, you should find out the reasons and try to eliminate them. If it is still invalid, it should be disassembled and reinstalled. Generally, the static pressure test pressure is 2~3 kg/cm2. c. Press the pump to turn the disc to check if it is light and even. If the car is struggling or not moving, check whether the assembly size is wrong and the installation is reasonable.
Installation and outage
a. Keep the sealed chamber filled with liquid before starting. For transporting a solidified medium, steam is applied to heat the sealed chamber to melt the medium. The car must be driven before starting to prevent the soft ring from breaking due to sudden start. b. For mechanical seals using the pump external seal system, the oil seal system should be activated first. Finally stop the oil sealing system after parking. c. After the hot oil pump is stopped, the cooling water of the sealing oil chamber and the end face seal cannot be stopped immediately. When the oil temperature of the end seal is lowered to below 80 degrees, the cooling water can be stopped to avoid damage to the sealing parts.
Running
a. If there is a slight leakage after the pump starts, it should be observed for a while. If the leakage is still not reduced if the operation is continued for 4 hours, the pump should be stopped. b. The operating pressure of the pump should be stable and the pressure fluctuation should be no more than 1 kg/cm 2 . c. During the operation of the pump, evacuation should be avoided to avoid dry friction and seal damage on the sealing surface. d. Sealing should be checked frequently. During operation, when the leakage exceeds the standard, the heavy oil is not more than 5 drops/min, and the light oil is not more than 10 drops/min. If there is no improvement trend within 2-3 days, the pump plug should be stopped to check the sealing device.
Characteristics
There are two cases of sealing 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. Alternatively, the seal separates the vacuum chamber from the outer chamber and its function is to maintain the desired degree of vacuum. This situation is complicated because the surrounding gas medium will reduce its vacuum even if it leaks slightly into the vacuum chamber. If a corrosive gas is leaked, the vacuum equipment may be damaged. In many cases, the cleanliness of the vacuum and vacuum space has a decisive influence on the quality of the various processes carried out under vacuum conditions. The mechanical seal used in vacuum devices has no structural specialities. In the first case described above, a metal bellows type single-end mechanical seal with good airtightness is usually used. In the second case, a double-face mechanical seal is used. If a single-end seal is used, there is a problem that the seal end face cannot be lubricated.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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