CN2556588Y - Petaling straight cannelure pipe - Google Patents

Abstract

The utility model relates to an improvement of a petal-shaped straight longitudinal grooved pipe patent, which is characterized in that the curvature radius R1 of the groove peak is greater than the curvature radius R2 of the groove valley, and R1 is 1-3mm, 1.5<R1/R2<2.5, The depth of the groove valleys is between 1.0 and 1.1 mm. The improved petal-shaped straight longitudinal grooved tube, due to the deepening of the groove valley, the ratio of the curvature radius of the groove peak to the curvature radius of the groove valley increases, so that the flow film outside the tube not only covers the heat transfer more uniformly surface, and because the Maragoni effect is significantly enhanced, the heat transfer capacity is effectively improved due to the enhanced secondary turbulence of cooling water and refrigerant water in the tube.

Description

Petal-shaped straight longitudinal grooved tube

technical field

The utility model relates to a patent improvement of 95234567.6 petal-shaped straight longitudinal groove pipe.

Background technique

The 95234567.6 petal-shaped straight longitudinal grooved pipe patent is characterized in that there are longitudinal grooves on the inner and outer walls of the pipe, the peaks and valleys of the grooves have the same curvature, and the curvature radius R is 1-3 mm. During the implementation of this patent, some changes were made to make the disturbance of the liquid film outside the tube stronger, and the heat transfer and mass transfer capabilities were significantly enhanced.

Contents of the invention

The purpose of this utility model is to improve the 95234567.6 petal-shaped straight longitudinal grooved pipe patent, and provide a petal-shaped straight longitudinal grooved pipe with stronger disturbance of the liquid film outside the pipe and significantly enhanced heat transfer and mass transfer capabilities.

The technical scheme of the utility model is that it is composed of a pipe body, and straight longitudinal grooves are arranged on the inner and outer walls of the pipe, and the thickness of the cross-section of the pipe wall is uniform. The radii R2 and R1 are 1-3mm, 1.5<R1/R2<2.5, and the depth of the groove valley is between 1.0-1.1mm.

Because the depth of the flute valley of the present utility model is improved from 0.5mm in the original patent to between 1.0 and 1.1, the curvature radius R1 of the flute peak is greater than the curvature radius R2 of the flute valley, and the R1/R2=1 of the original patent Increase to 1.5<R1/R2<2.5, so that the flow film outside the tube not only covers the heat transfer surface more uniformly, but also due to the significant enhancement of the Maragoni effect, the secondary turbulence of the cooling water and refrigerant water in the tube is enhanced, The heat transfer capability is effectively improved.

Description of drawings

Fig. 1 is the front view of the utility model;

Fig. 2 is a view along the direction A of Fig. 1 .

Detailed ways

The utility model embodiment is described in conjunction with accompanying drawing.

As shown in Figures 1 and 2, in this embodiment, the pipe body 1 is a copper light pipe, and 15 straight longitudinal grooves 2 are arranged on the inner and outer walls thereof. The curvature radius R1 of the groove peak is 1.07mm, and the curvature radius of the groove valley R2 is 0.52mm, R1/R2=1.07/0.52 is 2.06, the depth d of the groove valley is 1.07mm, the pipe wall thickness t is 0.7mm, the outer diameter Do is 1 6mm, the inner diameter is 12.46mm, and the adjacent groove peak The top pitch P is 3.327mm. When the pipe is used on the absorber, the heat transfer coefficient is measured to be 1200kcal/m ² ·h·℃ when the flow velocity in the pipe is 1.5m/s and the spray density is 190kg/m·h, which is much improved.

Claims (1)

1. A petal-shaped straight longitudinal grooved pipe, which is composed of a pipe body, with straight longitudinal grooves on the inner and outer walls of the pipe. The thickness of the cross-section of the pipe wall is uniform, and its characteristic is that the curvature radius R1 of the groove peak is greater than that of the groove The curvature radii R2 and R1 of the valleys are 1-3mm, 1.5<R1/R2<2.5, and the depth of the groove valleys is between 1.0-1.1mm.