CN201892468U

CN201892468U - Internal thread copper pipe

Info

Publication number: CN201892468U
Application number: CN2010206603692U
Authority: CN
Inventors: 黄绍辉; 裘桂群
Original assignee: Ningbo Jintian Copper Tube Co Ltd
Current assignee: Ningbo Jintian Copper Tube Co Ltd
Priority date: 2010-12-03
Filing date: 2010-12-03
Publication date: 2011-07-06
Anticipated expiration: 2020-12-03

Abstract

The utility model relates to an internal thread copper pipe, wherein threads are uniformly distributed on the internal surface of the copper pipe. The internal thread copper pipe is characterized in that tooth profile parameters of the internal threads are as follows: a helix angle (beta) ranges from 30 to 40 DEG, toothed rack number ranges from 70 to 80, addendum angle (alpha)ranges from 15 to 20 DEG, and tooth height (H) ranges from 0.2 to 0.25 mm. Through integral combinational optimization of tooth profile parameters as helix angle enlargement, tooth height and toothed rack number increase and addendum angle reduction, excellent effect is achieved, internal surface area of the internal thread copper pipe per unit length is increased as compared with other internal thread copper pipes with same external diameters and different tooth profiles, thereby greatly increasing the heat exchange coefficient of the refrigerant and the heat transfer coefficient in the heat transfer pipe, and reducing energy consumption, the quality of the internal thread copper pipe per unit length and production cost, and the internal thread copper pipe is applicable to refrigeration equipment of all sorts of specifications.

Description

A kind of inner screw thread copper pipe

Technical field

The utility model relates to a kind of inner screw thread copper pipe, especially a kind of inner screw thread copper pipe with large helix angle, close profile of tooth.

Background technology

China is first big producing country and second consumption market of refrigeration air-conditioner, the social recoverable amount and the newly-increased sales volume of refrigeration air-conditioner are huge, but also aggravated simultaneously and supply of electric power between contradiction, for promoting the sound development of refrigeration air-conditioner industry, further improve the air-conditioning Energy Efficiency Ratio, realize air conditioner energy saving, the most direct technological approaches improves the heat transfer property of air-condition heat exchanger (evaporimeter and condenser) exactly; Simultaneously in order to control the air-conditioning cost, effective measures use heat conduction reinforced technology exactly, improve the heat output and the coefficient of heat transfer of heat transmitter unit are, save material.And the of paramount importance link of the coefficient of heat transfer that improves heat exchanger copper pipe unit mass is exactly the rational Design on Plane of tooth profile parameter.

The existing patent No. is the Chinese patent " the ultra-fine footpath of a kind of internal thread copper pipe " of Chinese patent 03246217.4, the ultra-fine footpath of internal thread copper pipe is disclosed, it includes the uniform inner screw thread copper pipe of screw thread on the copper pipe inner surface, it is characterized in that: the external diameter of described inner screw thread copper pipe is less than 5 millimeters, the thin-walled of its statement of while, thin footpath, the inner screw thread copper pipe tooth profile parameter of high tooth is that helical angle is 5～30 °, tooth depth is 0.05～0.18mm, addendum angle is 15～65 °, the number of teeth is 12～40 in the pipe, its tubing is because helical angle is little, the number of teeth is few, therefore application is limited to, and only is applicable to that refrigerating capacity is less than the domestic air conditioning evaporimeter external diameter of 2500W (1) inner screw thread copper pipe less than 5mm.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of novel inner screw thread copper pipe with large helix angle, close profile of tooth at the above-mentioned state of the art, carry out OVERALL OPTIMIZA-TION DESIGN FOR by tooth profile parameter (tooth depth, tooth bar number, helical angle, apical tooth angle etc.) to inner screw thread copper pipe, strengthen intraductal heat exchange, be fit to the refrigeration plant of all size, and reduced energy consumption and cost.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of inner screw thread copper pipe, it is at the uniform screw thread of copper pipe inner surface, it is characterized in that: the tooth profile parameter of described internal thread is: helixangle is 30 °～40 °, it is 70～80 that tooth bar is counted n, addendum angle α is 15 °～20 °, and tooth depth H is 0.2～0.25mm.

Preferably, described internal thread is a helical form, and the cross section of thread is a triangle.

At last, the external diameter of described copper pipe is 5～9.52mm.

Compared with prior art, advantage of the present utility model is: by increasing helical angle, increase tooth depth and tooth bar number, reducing the entire combination optimization of tooth profile parameters such as addendum angle, obtained good result, all kinds of inner screw thread copper pipes identical with other external diameters, dissimilar tooth form are compared, the unit length internal surface area of inner screw thread copper pipe is improved, so just increase substantially the coefficient of heat transfer of cold-producing medium and the heat transfer coefficient in the heat-transfer pipe pipe, reduce energy resource consumption, reduced the quality of inner screw thread copper pipe unit length simultaneously, reduced production costs.Inner screw thread copper pipe of the present utility model is fit to the refrigeration plant of all size.

Description of drawings

Fig. 1 is a straight tube profile of the present utility model;

Fig. 2 is a cross section partial enlarged drawing of the present utility model.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in the figure, a kind of inner screw thread copper pipe, its external diameter is 5～9.52mm, the internal thread of described inner screw thread copper pipe is a helical form, the cross section of thread is a triangle, and the tooth profile parameter of the internal thread of described inner screw thread copper pipe is: helixangle is 30 °～40 °, and it is 70～80 that tooth bar is counted n, addendum angle α is 15 °～20 °, and tooth depth H is 0.2～0.25mm.

The utility model during fabrication by to evaporation and during condensation the heat exchange mechanism of working medium (the evaporation and heat-exchange aspect considers to strengthen turbulent flow and the vaporization nucleus calculation is stablized in increase; The condensing heat-exchange angle will be considered " Gregoring " effect) analysis, thereby the tooth profile parameter (tooth depth, tooth bar number, helical angle, apical tooth angle etc.) to inner screw thread copper pipe carries out OVERALL OPTIMIZA-TION DESIGN FOR, the existence of helical angle is in order to make the fluid rotation, make fluid generation and radially different secondary stream in the pipeline, increase the intensity of turbulent flow, thereby heat exchange is strengthened, and the heat exchanging coefficient improves very big facilitation.Therefore but along with the increase of helical angle, the pressure loss (resistance) also becomes greatly, detects through experiment, helical angle is arranged at 30 °～40 ° is set scope reasonably; Increasing the number of teeth (being screw thread bar number) can increase the number of the nucleus of boiling, helps the behave of boiling heat transfer, makes tooth pitch more reasonable, has improved the utilization rate (both can be used as evaporimeter, and also can be used as condenser) of tubing; Addendum angle α is dropped to 15 °～20 ° by original 40 °, and tooth depth H is 0.2～0.25mm, and the ratio of the kerve width of profile of tooth and height is reasonable, increases the profit girth, makes the evaporation heat transfer effect and holds that liquid level is long-pending to significantly improve; The external diameter of inner screw thread copper pipe is 5～9.52mm, is fit to the refrigeration plant of all size.

Use through practice, all kinds of inner screw thread copper pipes identical with other external diameters, dissimilar tooth form are compared, and the unit length internal surface area improves, and heat exchange property improves more than 20%, and condensation improves 10%, and the material cost of producing the air-conditioning product descends 8%.

Claims

1. inner screw thread copper pipe, it is characterized in that at the uniform screw thread of copper pipe inner surface: the tooth profile parameter of described internal thread is: helical angle (β) is 30 °～40 °, and tooth bar number (n) is 70～80, addendum angle (α) is 15 °～20 °, and tooth depth (H) is 0.2～0.25mm.

2. inner screw thread copper pipe according to claim 1 is characterized in that described internal thread is a helical form, and the cross section of thread is a triangle.

3. inner screw thread copper pipe according to claim 1 and 2, the external diameter that it is characterized in that described copper pipe is 5～9.52mm.