Jiang Xianze Drilling & Production Plant, Shifang 6184001 Introduction In our lives and work, we have to face such situations as the spraying machine used to smear the wall, the washing machine used to clean the leather clothes, the glass window and the outer wall of the building. The use of washing machines, all kinds of trucks, trucks, trucks, cement trucks, garbage trucks, motorcycles, bicycles, and other washing machines require that the prime mover can automatically unload when the sprayer pauses the cleaning work or needs to adjust the work station; When the gun opens, normal cleaning work can be resumed immediately. Only the cleaning machine with this performance can meet the basic requirements of cleaning work. The automatic unloading valve used in the washing machine does not need any other operation, as long as the spray gun switch on the washing machine is controlled, the automatic unloading and cleaning work of the prime mover of the washing machine can be automatically restored.
2 Principle Automatic unloading The pump is automatically unloaded.
When the spray gun is closed, the upper part of the spool becomes a kind of hydraulic cylinder, and the spool moves to the stop at the hydraulic pressure. At this time, the large diameter of the spool cuts off the passage of the spray gun. At the same time, the annular groove at the small diameter of the lower part of the valve core forms an unimpeded path for the unloading circuit and the sucking population of the cleaning pump and achieves the purpose of automatic unloading.
The force of the spool is determined by the following formula: small diameter 3, cm; JP cleaning pump working pressure, Pa; unit conversion factor.
The cleaning pump automatically resumes the cleaning process. 2. When the spray gun is opened, the upper part of the valve plug suddenly decompresses, and the annular surface of the valve core is pushed upwards into the sealing space by a upward thrust valve and enters the large annular space. Stop at the stop. At this time, the upper pipe is opened and the lower unloading pipe is cut off, and the cleaning work is automatically resumed.
The force acting on the spool is determined by the following formula: the force acting on the spool, N; i, the large diameter of the spool, the small diameter of the spool, the unloading pressure of the cadaver, MPa; and the conversion coefficient of 100 units.
Shenyang University of Electric Power, Shenyang 10036, China; 2. Liaoning Electric Workers University has improved the design and processing of gaskets.
1 Introduction Pad seals are commonly used static seal types in various types of fluidic equipment for thermal power plants. Leakage is a common failure mode for production equipment. To achieve safe, stable, long-term, full-load, optimized production, the performance of seals must be improved. The higher the demand.
Pads are sealed with non-metallic gaskets. Non-metal and metal combination gaskets and metal gaskets. In general, non-metallic gaskets are selected at room temperature and low pressure, and when there is a constant pressure, the metal gasket or non-metal and metal gaskets are generally selected. The metal tooth-shaped gasket is made of metal. It uses the high-stress stress of the tooth tip part to form the metal wire seal. It has high safety and reliability, and can achieve a high 3-structure valve core structure. 3 small, spool According to the principle of the size, the requirements of 12 are determined, integrated into the end cap of the cleaning pump, and the cleaning pump can achieve the purpose of automatic unloading and automatic restoration and cleaning.
4 Cautions The valve plug must be installed horizontally.
Minimize the quality of the entire spool to reduce the impact of the spool movement.
Sealing effect. However, to produce a good quality metal toothed gasket, its material selection structure and processing are very important.
2 Material Selection and Structure Because the working environment of thermal power generation equipment is in high-pressure and high-temperature conditions, it is required that the toothed pad has a certain elastic or plastic deformation performance, and the hardness difference between the flange and the sealing pad should be less than 4, 18. For this purpose, 3 or 8 suppression materials should be used. Its structure 1. In order to better guarantee the line seal, it is required that the upper and lower planes should be 3.2 degrees parallel to each other 彡 0.02. To ensure that the sharp corners are not bumped, a fixed width is required.
In recent years, with the continuous development of sealing technology, the material and structure of gaskets have also been greatly improved. Traditional asbestos sealing materials have gradually been developed. Iir attention to anti-corrosion.
4 The various diameters of the spool must be coordinated in order to achieve the purpose of closing freely.
5 Conclusion The performance of the cleaning machine with automatic unloading valve is very superior, flexible and reliable action, which greatly facilitates the cleaning work. Save energy. Simple structure, easy to manufacture.
Editor Yong Pingding, iMP Author brief introduction Jiang Xianze male, senior engineer.
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