Jinan galvanized pipe manufacturer for you to introduce: hot-dip galvanized steel pipe, the surface area of the threads in the tube is small, the existing heat transfer pipe threads are contour tooth internal thread and high and low tooth internal thread. Limited by the structure shape, the laminar surface directly affects the heat exchange efficiency and its stability when the liquid-vapor two-phase state transition is carried out in the tube. For example, the work of evaporative heat transfer tube is refrigerant liquid, which vaporizes because of the constant absorption of surrounding heat, so as to achieve the purpose of refrigeration, the refrigeration capacity formula is Q = K * F * T for heat transfer, K for total heat transfer coefficient, F for total heat transfer area, T for logarithmic temperature difference. Quality characteristics, tube structure and inner surface area. When the material characteristics of the heat transfer tube are certain and the heat transfer coefficient is constant, the key of refrigeration is limited to the increase of the inner surface area, and it must accord with the structure of reducing laminar flow, increasing turbulence, increasing evaporation and vaporization core in fluid mechanics.
At the same time, due to the characteristics of the existing seamless inner thread pipe processing methods, it is inevitable that stress concentration will be formed at the root of the inner thread tooth, which will easily release stress and cause cracking or improper deformation during the subsequent bending and expansion process. The purpose of the utility model is often encountered in the use of the inner thread pipe. By changing the structure of the internal thread tooth of the heat transfer tube, the reasonable profile and the fluid conduction are set up to obtain high efficient heat exchange.
The content of the invention is a thin-tooth seamless galvanized steel pipe with internal thread for high-efficiency heat transfer. The surface of the heat transfer pipe is provided with a thread-tooth shape, which is characterized by a plurality of teeth ribs with spiral angle trapezoidal edges on the inner surface of the heat transfer pipe. The cross-section of the teeth is composed of two trapezoidal shapes, i.e. a virtual trapezoidal shape with an upper trapezoidal shape and a lower bottom length. The lower trapezoidal 2 is long at the top and bottom, and the two trapezoidal edges are angular at the junction. The upper trapezoidal 1 is isosceles trapezoidal or isosceles trapezoidal. The root of the tooth rib is tightly connected to the tube wall, and the top of the upper trapezoidal 1 is the top of the thin tooth, which is a slippery turning to form a whole thin tooth with internal thread galvanized steel. The upper trapezoidal 1 trapezoidal edge of the thin tooth can also be machined into a cross-sectional coincidence; the lower trapezoidal 2 bottom edge of the tube tooth has a smaller inner angle, the bottom edge angle =45120 degrees, the two bottom edge angles can be equal or unequal, the screw thread of the thin tooth can be left-handed or right-handed, and its height can be equal or unequal. The pitch can be equal or unequal. The angle between the helix of the threaded pipe teeth and the axis of the master pipe, i.e. the helix angle_=040 and the number of helix lines with the height of the thin tooth Hf=0.180.30mm N=3070, in which the angle 2=4090 under the thin tooth is trapezoidal.
The lower trapezoidal 2 is isosceles trapezoidal or isosceles trapezoidal, and its side length or the same side length C=0.030.08mm upper trapezoidal 1 apex angle, that is, the apex angle_1=1230 degrees of thin teeth. The utility model has thin tooth shape, large tooth height, and a bigger angle between the helix of the tooth shape of the tube and the axis of the main pipe, so it has a bigger disturbing effect than the common inner thread pipe; and the general tooth tip is the best vaporization and condensation nodule center, and the edge angle produced at the junction of the upper trapezoid 1 bottom of the tooth and the upper and lower trapezoid 2 bottom of the tooth makes vaporization and condensation. The number of core knots is more than doubled than that of the original internal thread tubes, which is more conducive to vaporization and condensation. The lower trapezoidal two bottom angles of the threaded pipe teeth are small, and the bottom wall joint of the heat transfer pipe is enlarged, thus effectively dispersing the stress and increasing the strength of the pipe, thus greatly eliminating the quality problems and defects in bending, expanding and expanding of the original common galvanized steel pipe with internal threads (high-tooth internal threads and high-low-tooth internal threads). The utility model improves the processing performance of the pipe, reduces the expanding crack probability of the evaporator and the condenser in the process of expanding and expanding the pipe, thereby reduces the occurrence of the internal leakage phenomenon and improves the yield of high quality products.
At the same time, the seamless pipe production technology eliminates the welding seam heat resistance and other quality problems, and ensures the integrity of the internal surface structure. And for the manufacturer of evaporator and condenser, the heat exchanger with higher heat transfer efficiency can be obtained without increasing the use of copper tube. The utility model enlarges the inner surface area of the galvanized steel pipe from the structure, and makes the turbulence effect more obvious, thus improving the convective heat transfer coefficient. The following is further described with the accompanying drawings. The drawings illustrate a thin-tooth seamless heat transfer tube with internal thread. The tube surface is machined with a plurality of teeth with helical angle_. The cross-section of the tube is a structure of two trapezoidal 12-connected teeth ribs.
With the summary of Jinan galvanized pipe manufacturer, I hope it will be helpful to our customers. If you have any incomprehension or seek help, please click our official website: Jinan galvanized pipe hhttp://www.jnxjm.com or inquiry, we will try our best to solve it for you.