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With the development of modern industry, especially oil and gas field development, mining, metallurgy, electric power, paper making, fine chemical industry, salt chemical industry, water supply and drainage, sewage treatment, food processing and other industries, there are more and more pumps conveying solid particle media. The fluid medium containing solid particles and fibers is very unfavorable to the work of pump mechanical seal
Published on: December 26, 2020 Number of hits: 89
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Characteristics of reactor sealing device Understand the characteristics of different types of reactors to master the key points of mechanical seal design. 1. From the lubrication point of view, the mechanical seal used for the plug-in reaction kettle at the side of the mixing shaft generally does not have the problem of poor lubrication, and the liquid level of the medium in the kettle must be kept at a certain height. For the reaction kettle with shaft protruding from one side, the shaft is in cantilever state, so it is easy to produce
Published on: December 12, 2020 Number of hits: 108
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The mechanical seal is a mechanical part used to seal the rotating shaft and the stationary pump chamber. The sealed part is a cylindrical area, the shaft in the equipment rotates and penetrates inside and outside the equipment, and the body part is still and full of fluid medium inside. Driven by pressure difference, concentration difference and temperature difference, fluids inside and outside the equipment exchange with each other; "Sealing" means to control the fluid exchange between internal and external areas, so that“
Published on: December 11, 2020 Clicks: 87
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Corrosion prevention of mechanical seal for kettle is very important. Today, I would like to share some common knowledge about corrosion prevention of non-metallic rings: 1. Graphite ring corrosion. There are three reasons for the corrosion of resin impregnated impermeable graphite ring: first, when the end surface is overheated and the temperature is greater than 180oC, the impregnated resin will break away from the graphite ring, reducing the wear resistance of the ring; Second, if the impregnated resin is not properly selected
Published on: November 28, 2020 Number of hits: 97
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Common faults and solutions of mechanical seal for kettle 1. Fault phenomenon: leakage occurs at the sealing surface. Fault cause: screw thread is loose; The sealing surface is damaged. Troubleshooting: Retighten the screw; Regrind and polish the sealing surface. 2. Fault phenomenon: there is leakage at the valve. Fault cause: the valve rod (needle) and valve port sealing surface are damaged. Troubleshooting: repair and replace the valve rod
Published on: November 27, 2020 Number of hits: 202
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205 double end kettle mechanical seal structure features: 205 type kettle mechanical seal is double end, multi spring unbalanced structure. The purpose of sealing is mainly achieved by the pressure difference between the sealing liquid in the sealing chamber and the sealed medium. The sealing liquid needs another set of device to circulate. The whole system is complex. Therefore, it is only used for sealing flammable, explosive, toxic and strongly corrosive media in special occasions. Friction pair
Published on: November 13, 2020 Number of hits: 189
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The leakage point of chemical pump The leakage point of chemical pump The mechanical seal for pump has a wide range of types and different models, but there are five main leakage points: the seal between the shaft sleeve and the seal between the shaft sleeve and the seal between the shaft sleeve Sealing between stationary rings Sealing between stationary ring and stationary ring seat Sealing between end cover and pump body
Published on: November 13, 2020 Clicks: 87
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For the maintenance of mechanical seal, it is necessary to master the maintenance and repair of mechanical seal. First, it is necessary to know the working principle of mechanical seal. The mechanical seal is a sealing device composed of two sealing elements (static ring and dynamic ring) perpendicular to the shaft, smooth and straight surfaces that stick together and rotate relative to each other. It is generated on the contact surface (end face) of rotating rotating ring and stationary ring by the pressure of sealing medium
Published on: November 9, 2020 Number of hits: 69
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Grinding technology of mechanical seal sealing surface - manual grinding and mechanical grinding Manual grinding is mainly used for small batch production and repair of single piece. Manual grinding is labor-intensive and requires skilled operators. Mechanical grinding is used in mass production. 1、 Manual grinding Manual grinding generally uses flat plate, which is made of high carbon cast iron, and flat plate is generally three
Published on: November 9, 2020 Number of hits: 5932
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Mechanical seal failures are generally known by people after abnormal leakage, abnormal wear, abnormal torque and other phenomena. The reasons for the failure are as follows: 1. The design and selection of mechanical seal are incorrect; 2. Poor mechanical seal quality; 3. The accuracy of the machine using or installing mechanical seals cannot meet the requirements; 4. Machine operation error
Published on: November 6, 2020 Number of hits: 61
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Oil seal is a mechanical element for sealing, also known as rotary shaft lip seal ring. Oil seal is used to prevent the oil from leaking from the machinery to prevent oil entering the friction part of the machinery when the machinery is running. The common type is skeleton oil seal. 1、 Common representation of oil seal: oil seal type - inner diameter - outer diameter - height - material, such as TC40 * 62 * 12
Published on: November 5, 2020 Number of hits: 130
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Discussion on common damage causes and maintenance of dry gas seal sealing weir prevents gas from flowing to the middle, so that the gas is compressed, causing pressure rise, and the seal end clearance is statically set to form the required gas film. The balance clearance (film thickness) of seal face is generally 2~10 μ M. In this way, the end clearance can control the opening force of the interface by itself, balance with the external closing force, and make the gas film
Published on: November 4, 2020 Clicks: 162
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General knowledge of mechanical seal Working principle of mechanical seal Mechanical seal is a shaft seal device that can prevent leakage by means of one or more pairs of opposite sliding end faces perpendicular to the shaft under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and matching with auxiliary seals. 2. Selection of common materials for mechanical seal: purified water; normal atmospheric temperature; (Dynamic) 9CR18, 1CR13 surfacing cobalt chromium
Published on: November 3, 2020 Number of hits: 73
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The mechanical seal manufacturer introduced the system composition shaft seal box. In the past, the shaft seal box containing mechanical seal was a stuffing box designed for soft packing seal. It is not suitable for holding mechanical seals. Not only is the size too small, the gap too narrow, but also the simple cylinder shape is not suitable. The standard of oversized mechanical seal shaft seal box has been formulated abroad. In addition, the United States_ Durametalek and British Fluid
Published on: October 30, 2020 Number of hits: 80
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Lubrication of mechanical seal for kettle Mechanical seal working in liquid medium generally relies on the liquid film formed by liquid medium between the dynamic and static ring friction surfaces for lubrication. Therefore, maintaining the liquid film between friction surfaces is essential to ensure the stable operation of mechanical seals and extend their service life. According to different conditions, the friction between the dynamic and static rings of the mechanical seal may occur in the following cases: (1)
Published on: October 29, 2020 Number of hits: 89
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