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<p>Common <a href="https://www.lepuseal.com/products-1" target="_blank">mechanical seal</a> cooling and flushing methods</p><p><br></p><p><a href="https://www.lepuseal.com/products-1" rel="noopener noreferrer" target="_blank"><strong>Mechanical seal </strong></a>cooling and flushing methods are indispensable operating points during product use, but many users know this operation, but do not understand the specific operating points, so the following is a detailed introduction to it.</p><p>Due to the friction of the end face, a large amount of friction heat will be generated, which will increase the temperature of the friction ring. At the same time, if the temperature of the sealing medium itself is relatively high, the end face of the friction pair will always operate at a very high temperature. In this case, if no flushing and cooling measures are taken, it will cause:</p><p>(1) The liquid film between the end surfaces evaporates and dry friction occurs;</p><p>(2) The auxiliary sealing ring made of rubber and plastic materials will age, crack and even fail;</p><p>(3) Accelerate the corrosion effect of the sealing medium on the sealing parts;</p><p>(4) Dynamic and static ring deformation;</p><p>(5) Increased end face wear;</p><p>(6) The end face leakage is serious.</p><p>From this point of view, the use of flushing oil and cooling water for seals is to reduce the temperature during friction, ensure that there is a complete liquid film between the friction surfaces, reduce friction loss, reduce power consumption, and ensure that the liquid film does not vaporize due to high temperature. destroyed. Therefore, the washing and cooling measures of the seals are an essential and important link to ensure that the seals have good sealing performance and long service life.</p><p><br></p><p>Common mechanical seal cooling and flushing methods</p><p><br></p><p>Common mechanical seal flushing and cooling see below</p><p>Direct injection of liquid into the high pressure side part of the double end face or single end face seal is called "flushing". Generally, pumps should be flushed, especially light hydrocarbon pumps. The purpose of flushing is to seal, cool and lubricate:</p><p>(1) The external circulation of liquid compatible with the medium is passed into the sealed sealed cavity), so as to prevent high temperature, toxic and precious media from leaking from the pump shaft; prevent the medium containing solid particles from leaking into the sealed cavity and wear the sealing surface; Prevent the medium that is easy to vaporize and freeze, such as liquefied gas To prevent air and flushing fluid from leaking into the pump.</p><p>(2) Cooling prevents high-temperature medium from entering the sealed cavity; guiding away the frictional heat generated when the moving ring and the static ring work.</p><p>(3) Lubrication maintains a layer of liquid film between the sealing surfaces for lubrication.</p><p>1, self-rinsing</p><p>Features: Using the sealed medium as the flushing liquid, a small part of the liquid is drawn from the outlet side of the pump, directly injected into the high-pressure side of the seal end surface, flushed, and then flowed into the pump cavity.</p><p>Purpose: Suitable for occasions where the pressure in the sealed cavity is less than the pump outlet pressure, greater than the pump inlet pressure, the medium temperature is not high, and the temperature is less than or equal to 80C) and does not contain impurities.</p><p>2, external flushing</p><p>Features: Another flushing fluid is used, the flushing fluid should be:</p><p>(1) Clean, non-corrosive without solid particles, low temperature (usually 40"C).</p><p>(2) It has a certain degree of lubricity and does not affect the quality of process products.</p><p>(3) It is not easy to produce vaporization under operating conditions.</p><p>Purpose: Used in the occasions where the temperature of the sealed medium is high, easy to vaporize, and the impurity content is high. The pressure of the lotion is 0.1~0.2MPa higher than the pressure of the medium in the sealed cavity.</p><p>3. Circulating flushing</p><p>Features: Circulate the liquid in the seal ring by means of the impeller in the seal cavity. The heat taken away is the heat generated by the mechanical seal. Compared with self-washing, the cooling water consumption is less.</p><p>Purpose: Because of the small head of the impeller in the pump, it is suitable for occasions where the pressure difference between the inlet and outlet of the pump is small.</p>
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