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| Metal Hose with Straight Fittings |
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The utility model relates to a metal hose with a straight pipe joint, which belongs to the technical field of fluid conveying pipelines. The metal hose is formed by butt welding of a corrugated pipe section and a straight pipe section covered with a steel mesh sleeve, wherein the straight pipe section has an inner thread, the inner thread is matched with the spiral of the end of the corrugated pipe, and the starting point of the inner thread of the straight pipe section is the same as the corrugated pipe. The ends of the spirals of the tubes meet. In this way, the stable rotating flow field in the metal hose can be maintained in the straight pipe section, thereby ensuring that the flow field is always uniform and stable during the fluid transportation process. It is easy to understand that the structure of the utility model solves the sudden change of the stable rotating flow field in the existing metal hose when it enters the straight pipe section, eliminates eddy currents, and avoids a series of problems such as pressure loss caused thereby.
1. A metal hose with a straight pipe joint is formed by butt welding of the corrugated pipe section and the straight pipe section of the outer wire mesh sleeve, and it is characterized in that: the straight pipe section has an inner thread, and the inner thread and the spiral of the bellows end are formed by butt welding. match, and the starting point of the inner thread of the straight pipe section is connected with the helical end point of the corrugated pipe. 2. The metal hose with a straight pipe joint according to claim 1, wherein the internal thread of the straight pipe section is consistent with the helical direction and pitch of the corrugated pipe, and the shape of the internal thread is similar to the waveform of the corrugated pipe. 3. The metal hose with a straight pipe joint according to claim 2, wherein the straight pipe section is welded with a flange to form a straight pipe joint. 4. The metal hose with straight pipe joints according to claim 3, characterized in that: the flange is butted with the butt joint by means of a connection screw, and a sealing ring is lined between the flange and the joint. Technical field The utility model relates to a metal hose with a straight pipe joint, in particular to an improvement in the connection structure of the straight pipe section of the metal hose, which belongs to the technical field of fluid conveying pipelines. Background technique The metal hose is mainly composed of a corrugated pipe, and is covered with a steel mesh sleeve. When the metal hose is connected with other components, no matter what kind of connection method is used, it is necessary to connect the straight pipe and the corrugated pipe, and add a connecting flange to form the joint of the metal hose. When transporting low-speed, small-flow gas and liquid, the pressure loss and flow field changes caused by the straight pipes at the above joints have little effect on the use. However, when conveying high-speed, large-flow gas or liquid, the effects of pressure changes and flow field characteristics caused by straight pipe sections include: (1) The gas or liquid in the pipe has been transported through the metal hose to form a stable rotating flow field. When it suddenly enters the straight pipe section, the flow field line is cut off, forming an unstable flow field and eddy current, causing obvious pressure loss. (2) Due to the instability of the flow field, the pressure in the straight pipe is unevenly distributed along the circumference of the pipe, thus causing additional vibration and noise. (3) Under the action of unstable flow field and additional vibration, the joint seal is easily damaged by additional factors. |
