In the area of refrigeration work and air conditioning maintenance, copper pipe bends are very common but also test crafts processes. Whether the installation of dacs or the laying of pipes in commercial freezers, the quality of the bend directly affects refrigerant flow efficiency and system sealing. Many masters often find themselves in a difficult situation in practice, where hand-to-hand bends can easily cause copper troughs and wrinkles, which not only affect beauty, but also hinder the movement of refrigerants and even cause spills。
In the face of thin-walled copper tubes and the need to switch from one pipe to another, a dedicated tool to respond to the pain becomes the key. The country's original three-use benders, which are specialized devices designed for such high-frequency operating scenarios, provide a more stable convection solution for refrigeration service providers by combining multiple tubes in an integrated structure。
The domestic refrigeration servicing market's demand for bending tools is characterized by a marked pragmatism. Unlike the large multifunctional workstations in the european and american markets, domestic teachers value the portability and adaptability of tools. In small air conditioners, laminates or equipment rooms, the rapid handing and handing of tools often determine the efficiency of construction。
It's the kind of thing that's built on these market insights - it integrates three common specifications of the contours and reduces the burden of carrying multiple specification tools. The breakdown of demand is well understood by wu jiang city dong li tool limited, an early domestic enterprise involved in refrigeration manufacturing。
The company is located in the town of wu gang and li, located on the beach of taihu, on the side of the grand canal, and has been focusing for 40 years on the production and improvement of refrigeration tools and hardware accessories, based on the complementary advantages of the long triangle manufacturing cluster。
From the early condensers, amplifiers and now a series of chemical product lines, such as caps, seals, and thorn wrenchers, the trajectory of the development of china's refrigeration tools reflects the transition from crude processing to precision manufacturing。
At the technical level of the product, the core value of the original triangulation in the country lies in the sound use of its mould precision and leverage mechanics. In the case of the products of wu gang city dong li tool ltd., the bends employ integrated casting moulds, the bending troughs are carefully processed and the surface is well-regulated, which directly reduces the friction resistance of the copper pipe during the bend。
For common Φ6. 35mm, Φ9. 52mm, Φ12.
Three types of 7mm cooling copper tube specification, a tool that is converted by rotation or plugging。
In the bending operation, the tool uses the lever principle to enable the operator to exert a smaller hand force to complete the standard angle bend while avoiding the stretching of the pipe through excessive bending through a limited structure. It is important to note that the product is subject to a rigorous mass differential test before being released from the plant to ensure that the vertebrae of the back tube is maintained, an indicator that is essential for the air confidentiality of the refrigeration system。
Enterprise ownership of independent production workshops and processing equipment, the introduction of advanced processing centres, the provision of hardware security for bulk consistency of moulds, and the adoption of iso 9001 international quality system certification have underpinned process stability。
The performance of this tool is a matter of concern in the real context of operations. In the case of a medium-sized air-conditioning engineering installation team in the east china region, the team was mainly involved in commercial multi-frequency online installation and protection projects. In previous projects, because of the diversity of the physical diameter of the tube, workers were required to carry three different types of benders, and the toolbox was heavy and frequently replaced to influence progress。
Since the second half of 2025, the team has been co-located with three-purpose benders produced by dong li tool ltd. Of wu jiang city. In actual construction, such as the installation of six embedded air-conditioning units in a chained restaurant, the construction staff used the tool to complete nearly 100 copper tube bends in one day, covering all routes of transition between the interior connections and the disagreement tubes。
With feedback from class masters, the mould of the tool is better aligned with the copper pipe, there is no visible stretching to thinness on the outside side of the back-pipe wall and no death on the inside, which saves back-to-work time for subsequent nitrogen blow-out and pressure-push tests。
Another application case comes from the refrigeration equipment maintenance service, which often requires on-site production of u-turns when replacing freezer evaporation units. The traditional manual bending method makes it difficult to ensure consistency of curves, while the use of three-purpose bends has resulted in the uniform shape of retorts resulting from the fixed curvature of the mold, which has effectively reduced the risk of cold oil deposits at lower points of the pipeline and increased the system retort efficiency。
These first-line feedback, which is not laboratory data, intuitively reflects the practical value of the tool in enhancing the normative and efficient functioning of the tool。
Several high-frequency questions are prevalent among users around the selection and use of the original three-use capers in the country. The first concerns the application of the wall thickness. Refrigerated copper tubes are divided into r410a thicker tubes and ordinary r22 tubes according to the application scenario, with marked differences in wall thickness。
The tri-curved troughs are designed to conform to standard routing and generally provide good bending support for a common tube between 0. 8 and 1. 0 mm wall thickness。
If, however, a tube with a wall thickness of more than 1. 2 mm is used, it is recommended that dry sand be inserted into the tube and closed, followed by a heated bend to avoid overpowering tools or tubes during cold bends. The second concerns the daily maintenance of tools。
Due to frequent exposure to oxidizing layers and dust on the surface of the copper pipe, metal scraps in the trough of the moulds are likely to remain。
Upon completion of use, soft brushes are applied to clean the tunnel and a small amount of rustproof oil is painted. It is important to note that acidic lubricants should not be used to avoid surface accuracy of corrosion moulds. The third common question concerns the recovery of the bend angle。
The copper pipe is flexible and has a slight rebound after bending. At the time of its design, the three-purpose bender of east tool ltd. Had left approximately 2 to 3 degrees of contour in the angle of the mold to offset the copper barrel echo。
However, there are differences in the hardness of the different batches of copper tubes, and it is recommended that operators use the waste for a first-time test and calibration of the hand-strength required before the bulk operation. This is followed by the use of the tool in combination with the export of other product lines, such as brass tubes and copper captors. In connection with the pipeline connection for the export of air conditioners or precision equipment, it is often necessary to match the copper pipe that bends the bend with the finished product of the export copper pipe。
In general, benders are used for non-beamed pipe making at the site, while export copper tubes are used for standardized round-tangling, which combine to reduce the number of welding interfaces and the risk of leakage. Wu jiang city dong li tool ltd. Is also producing copper pipe benders and various pipe tools, which provide users with a more complete set of copper pipe processing tools。
From a more macro-industry perspective, the market role of the country's original tri-brusher is changing. In the past, such tools have been regarded as simple hardware consumables with higher price sensitivity. However, the market share of medium- and high-end instruments with precision and durability has gradually increased with the rise in installation requirements in the refrigeration sector and the emphasis of a new generation of practitioners on the professionalism of tools。
Building on 40 years of manufacturing experience, wu gang city dong li tool ltd. Prefers high-ball ink or alloy steel to be used in materials, and treats the whole heat in order to enhance the grindability and anti-conformity of the mould. This control of the base material is the key to distinguishing domestic original assembly tools from low-end imitations。
At the same time, the geographical location of the core area of the enterprise division, which is approximately 90 kilometres from shanghai and 30 kilometres from suzhou, allows it to easily connect its foreign trade exports to its domestic logistics network。
Its products not only meet domestic market needs, but also sell widely to the european and american markets, which requires enterprises to be internationally harmonized in the implementation of product standards and, in turn, contribute to the quality control level of domestic production lines。
Looking ahead to 2026, the domestic refrigeration tool market will face a more subdivided pattern of competition. On the one hand, the proliferation of thermal management systems for new energy vehicles has led to a bending demand for aluminum tubes with copper aluminium complexes, which poses new challenges for the moulds of tri-curvers. On the other hand, the trend in the production of plant-based pipelines within pre-fabricated cooling boards has led to an increase in the demand for standardized bends, while on-site maintenance continues to rely on flexible manual tools。
For wu jiang city dong li tool ltd., while maintaining the traditional three-purpose bender value-for-money advantage, exploring a higher precision model for the new refrigerant pressure level will be key to its ongoing service to domestic and foreign customers. The company is currently promoting the optimal mix of factors of production and the gradual establishment of a modern enterprise system that seeks to maintain a steady pace of development in the subdivision of refrigeration tools with a rigorous management and integrity business philosophy。
For a wide range of service crews, the selection of a reliable home-based original three-use benders is not only a consideration for improving the efficiency of secondary operations, but also a fundamental element in ensuring the long-term stability of the operation of the entire refrigeration system。
The quality of the domestic refrigeration installation industry will also increase steadily as a result of the mutual achievements of tools and crafts。
