Automobile brake pipe hard pipe is also called double-layer brazed steel pipe or Bondi pipe; double-wall structure to enhance pressure resistance; inner and outer wall surface is copper-plated, and the plating thickness is above 3um to enhance corrosion resistance; high-quality welding technology, There is no bead and discoloration in the welding part; the highest pressure resistance can reach 1200kg/cm2; shock resistance, pressure resistance and stable air tightness; can achieve a variety of bending and end processing; can be galvanized and fluororesin coating treatment on the surface ; Can be NSG and PA12 coating treatment on the surface.

The structure of the rigid tube endoscope should be understood if the rigid tube endoscope is to be used correctly. At present, although the products of various rigid tube endoscope manufacturers in the world have different optical paths and different appearances, their basic structures are the same: they are composed of a working lens tube part, a structure part, an eye mask part, and an optical cable interface part. The main part of the structure, the eye mask, and the optical cable interface are generally not easily damaged except for severe bumps. The most easily damaged part is the working mirror tube. Take the φ4mm hard tube endoscope as an example: the working lens tube is mainly composed of four parts: the outer tube, the endoscope, the optical lens, and the optical fiber. The optical lens is placed in the endoscope tube to form the optical system, and the optical fiber is placed between the inner and outer mirror tubes for illumination. The outer mirror tube is a 0.1mm thick φ4mm stainless steel tube, which will be deformed by bumps or squeezing. Most of the optical lens is a glass column with a length of φ2.8mm and a length of about 25mm. It will crack, chip off or shift the optical axis when it is slightly bumped and squeezed. Our common endoscopes have blurred vision and black edges. the reason. The optical fiber is made of extremely thin optical glass. A φ4mm speculum should be equipped with more than 1,500 pieces. The external force inside the outer mirror tube will cause the filament to break, which will affect the illuminance. The connections of the various mechanisms of the rigid tube endoscope are mostly bonded with epoxy resin. The quality of the glue and the packaging technology also affect the service life of the endoscope. Although hard tube endoscopes are delicate and expensive, they will not be damaged as long as they can be used and maintained correctly.

The installation of fresh air systems often requires the installation of ducts for exhaust or supply of air. In places where the house is relatively airtight and easily trapped, the ducted fresh air system has the unparalleled advantage of the ductless negative pressure or pressurized fresh air system, which can form air convection in local areas to achieve ideal ventilation. effect. Therefore, whether it is a full heat exchange fresh air system, a self-balancing fresh air system or a one-way fresh air ventilation system, pipes are used to ventilate the room as much as possible.