Flue damper – Double-spherical hard-sealed flue damper (patented)

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This post was last edited by Xinghao You on 2016-2-3 at 14:39. Double-sphere hard-sealing flue baffle – Inventor: Zhang Binggang; Patent number: ZL201520251366.6; Patent holder: Luoyang Xinggang Petrochemical Equipment Co., Ltd. Name of the invention: Double-sphere hard-sealing flue baffle. http://www.lyxgsh.com/d/file/ry/zl/2015-08-05/46e6d602f19e858ecc3570d1a0dd7fc4.jpg. Abstract of the specification: 1. A double-sphere hard-sealing flue baffle, comprising a spherical sealing valve plate, a spherical sealing element, a drive shaft, a packing box, a pneumatic actuator, and support arms; wherein the pneumatic actuator is fixedly attached to the housing. The feature of this invention is that packing boxes are installed at both ends of the drive shaft, with one end passing through the packing box and connecting to the pneumatic actuator； The filler box is also fixed to the housing ； The support arm is fixed to the inner side of the housing; a secondary arm is hinged at one end of it, and a drive arm is secured to the drive shaft. Both the drive arm and the secondary arm are hinged to the spherical seal valve plate ； This spherical seal valve disc is a single-piece disc, with its outer side in close contact with the inner side of the spherical seal element ； This spherical seal is fixed to the inner side of the housing. Double-sphere hard-sealed flue baffle. Technical field: The present invention relates to a specialized petrochemical device, and in particular to a double-sphere hard-sealed flue baffle that can be used in catalytic flue gas pipelines. Background Technology: At present, in the domestic petrochemical industry, multi-axis flue dampers are commonly used for the flue pipes (D > 1.5 M) in catalytic units; see Figures 6 and 7 for details. The existing multi-axis flue dampers are equipped with two or more drive shafts, each drive shaft having bearings at both ends, and each drive shaft controls one valve plate. A spherical seal is placed between the damper and the housing. The multi-axis flue baffle has poor sealing performance; the valve plate deforms significantly at high temperatures, and the valve shaft and bearings are prone to getting stuck by the substances present in the flue, resulting in inflexible rotation and preventing operators from making adjustments during use. Furthermore, the existing multi-axis flue dampers also have multiple leakage points: between the various valve plates ； Between the flat valve plate and the seal body ； Between multiple filler boxes and the valve shaft, when the valve plate is opened, flue gas is likely to leak out from the aforementioned leakage points. It is evident that the existing multi-axis flue dampers still have obvious inconveniences and defects in terms of structure and usage, and further improvements are urgently needed. To address the problems associated with flue dampers, relevant manufacturers have made every effort to find solutions, yet no suitable design has been developed after all this time. Moreover, conventional products lack the appropriate structure to resolve these issues, which is clearly a problem that the industry is eager to solve. Therefore, how to create a flue baffle with a new structure is one of the important research topics at present, and it has also become a goal that the industry urgently needs to improve. In view of the aforementioned defects in existing multi-axis flue dampers, the inventor, drawing on years of practical experience and expertise in the design and manufacture of such products, as well as by applying theoretical knowledge, has made vigorous efforts in research and innovation in order to develop a new type of double-spherical hard-seal flue damper that can improve upon conventional multi-axis flue dampers and make them more practical. Through continuous research and design, as well as repeated trial production of samples and improvements, this invention with genuine practical value was finally created. Summary of the Invention: The objective of this invention is to overcome the shortcomings of existing multi-axis flue dampers, by providing a flue damper with a new structural design featuring double-spherical hard sealing. The technical problem to be addressed is to reduce the degree of deformation of the valve plate at high temperatures and to improve its sealing performance, thereby making it more suitable for practical use. The objective of the present invention and the technical problems it addresses are achieved through the following technical solutions. A double-spherical hard-sealed flue baffle according to the present invention includes a spherical sealing valve plate, a spherical seal, a drive shaft, a packing box, a pneumatic actuator, and a support arm, wherein the pneumatic actuator is fixedly attached to the housing ； Filler boxes are installed at both ends of this drive shaft; one end passes through the filler box and is connected to the pneumatic actuator ； The filler box is also fixed to the housing ； The support arm is fixed to the inner side of the housing; a secondary arm is hinged at one end of it, and a drive arm is secured to the drive shaft. Both the drive arm and the secondary arm are hinged to the spherical seal valve plate ； This spherical seal valve disc is a single-piece disc, with its outer side in close contact with the inner side of the spherical seal element ； This spherical seal is fixed to the inner side of the housing. Compared with the prior art, the present invention has obvious advantages and beneficial effects. Through the above technical solutions, the double-spherical hard-sealing flue baffle of the present invention achieves considerable technical advancement and practicality, and holds great value for industrial application. It possesses at least the following advantages: 1. The present invention uses an integral valve plate, which exhibits very little deformation at high temperatures of 600 to 800 degrees, thus eliminating the need for frequent replacement; it also solves the problem of poor contact between the sealing surfaces caused by deformation of the flue baffle ； 2. The improved double-spherical hard-sealed flue baffle of the present invention has only one leakage point: between the integral valve plate and the spherical seal body. The outer edge of the integral valve plate features a spherical sealing surface, while the inner surface of the spherical seal body is itself spherical in shape. The double-spherical seal provides optimal linear sealing, allowing the entire valve plate to completely cover the flue gas passage, thereby resulting in a leakage rate of almost 0% for the flue gas dampers ； 3. This invention includes an instrument air inlet in the packing box; during use, a small amount of instrument air needs to be supplied into the packing box, which helps to blow away the medium that fills the gap between the packing box and the drive shaft, thereby preventing jamming. It also allows for the cooling of the drive shaft, helping to avoid excessive bearing temperatures and extending the service life of the flue dampers ； 4. The present invention uses external bearings, which can reduce the heat transferred through the drive shaft due to the high temperature in the flue, and facilitate replacement.