The finned tube is to improve the heat exchange efficiency. By adding fins on the surface of the heat exchange tube, the outer surface area (or inner surface area) of the heat exchange tube is increased, so as to achieve the purpose of improving the heat exchange efficiency. Such a heat exchange tube . Usually used for heat exchange between liquid and gas.
Finned tube is a heat exchange element. As a heat exchange element, finned tubes usually work under high-temperature flue gas conditions for a long time. For example, the finned tubes usually used in boiler or harsh environments, high temperature and high pressure, and in a corrosive atmosphere. This requires that the finned tubes should have high anti-corrosion properties, Anti-wear properties, lower contact resistance, higher Stability and anti-dusting ability.
There are many types of finned tubes, and new varieties are constantly emerging. According to the classification of processing technology, there are extruded fin tube; high frequency welded finned tubes; rolled formed finned tubes; suit formed finned tubes ; cast finned tubes; tension wound finned tubes; Inserted tubes.
According to the shape of the fins, there are square finned tubes; circular finned tubes; spiral finned tubes; longitudinal finned tubes; corrugated finned tubes; spiral serrated fins Helical Serrated Finned Tubes; pin-shaped finned tubes; integral plate-shaped finned tubes; inner finned tubes.
According to whether the fin material of the finned tube is the same as that of the base tube, it can be divided into: single metal finned tube, bimetallic composite finned tube.
Single metal finned tubes are classified by material into copper finned tubes; aluminum finned tubes; carbon steel finned tubes; stainless steel finned tubes; cast steel finned tubes.
Finned Tube,Extruded Fin,Brown Fin Tube,Longitudinal Finned Tube Guangdong Jiema Energy Saving Technology Co.,Ltd , https://www.jiemaheatexchanger.com
(Original title: "Yang Tie Li" is a supply-side reform course)
[ China Agricultural Machinery Industry News ] Recently, a "fantastic thing" on the black soil in Northeast China has aroused widespread concern. In the process of arranging straw to return land, the cheap domestic iron plough was abandoned by many farmers’ friends, but the imported “foreign iron ploughâ€, which is more than 10 times more expensive, is favored. Even in some places, “you Free (with domestic plow) to turn (ground), the people do not let."
"Domestic plow" encounters the geometry of soil and water?
Behind the "wonders", the people have their own accounts.
Although there is no obvious difference between imported plough and domestic plough in terms of shape, structure, design and function, some plow companies in China are used to imitating and plagiarizing in product development. Although they can learn the appearance, they can't copy the essence. . It seems that there is no obvious difference, but some domestically plowed into the field to reveal the original shape - "turning effect, depth, efficiency, service life, etc., everything is worse." It is the "such a point" gap. Some imported ploughs have been used for two years, and even a screw has not been changed. Some domestic ploughs have not only been patched, but even the main beam of the plow has been broken. Later re-welded and reinforced." Ever since, the "foreign iron plow" is able to charge in the black land, but the "domestic plow" has suffered from the lack of water and soil, and has to abandon the wind and rain in the corner of the wall.
It is known that the northeastern autumn is cold early, leaving farmers with a short time to prepare for the whole land. When the key moments fall off the chain, who can afford it when the farmer is delayed.
What is even more commendable is that because the "foreign iron plow" has turned deep and deep, it can completely turn the straw into the soil and become fat, so that "shundao" solves the problem of the peasant's indiscriminate burning of straw.
It seems that the high price of "foreign iron plow" is not a strange thing. Insiders pointed out that in many aspects such as raw material adoption, technological level, technological innovation, and historical heritage, domestic ploughs have a large gap compared with imported ploughs. This gap is not only reflected in the level of development, technology, and sometimes a gap in development philosophy. Some small domestic agricultural machinery enterprises lack the long-term vision of modern agricultural development, blindly follow the trend of imitation, disorderly and low-cost competition, and the developed products seem to have great price advantages, but the quality is too water, and the imported goods in the market are not expensive; At the same time, most of the domestic large-scale agricultural machinery enterprises mainly rely on power machinery, pay little attention to the "small gadgets" such as plows, and the strategic thinking has not kept up with the market requirements of modern agricultural development. As a result, in the flip plough market, the phenomenon of “National Plow†retreating from “Yangli†is everywhere. The reporter survey found that in some areas where the scale of land management is relatively high, the “imported plow†has begun to sing the “protagonistâ€. .
As a plowing country, the peasants abandoned the "national plow" and pursued the "foreign plow", which is as embarrassing as the Chinese people rushed to Japan to buy toilet seats, and this is exactly what many domestic products need to step up to promote the supply-side structural reform. A miniature of it.
In 2017, the No. 1 Document of the Central Committee promoted the structural reform of the supply side of agriculture as the theme, and it was the rare opportunity for the production enterprises, scientific research institutions, and agricultural departments to strive for the upper reaches.
The structural reform of agriculture supply side and agricultural modernization are not mysterious. "Modernization" is hidden in every agricultural technology, every agricultural machine, every agricultural tool, every seed, every agricultural product; and these specific short plates are agricultural supply. An important focus of the side structural reform. Every farmer and every "iron plow" is made up, and the farmers like to use it; every agricultural product, every bottle of "milk" is done well, and the people are rushing to buy it. Our agricultural supply side structure Sexual reforms have succeeded and our agriculture has been modernized.