Tool arrangement for reducing weight and increasing efficiency in the processing of heat exchange tubes

Abstract

A tool arrangement for processing heat exchange tubes to reduce weight and increase efficiency, including a main shaft, a transition blade fixedly sleeved on the main shaft, a shaping blade, a transition spacer sandwiched between the transition blades, a shaping spacer sandwiched between the shaping blades, a positioning spacer sandwiched between the transition blade and the shaping blade, a washer and a nut for locking and fixing the blades. The shaping blade is a multi-blade combination with the largest outer diameter, and the transition blade is a multi-blade combination with an outer diameter gradually increasing except for the blade with the largest outer diameter. It also includes a flat head blade arranged behind the shaping blade. Through the change of the transition arc of the flat head blade in the present invention, more redundant metal materials at the root of the fin flow to the fin part, thereby making the fin height higher, which is beneficial to further processing of three-dimensional fins. At the same time, the heat exchange area of the fin part is increased, thus enhancing the heat exchange effect of the heat exchange tube.

Description

Technical Field

[0001] The present invention relates to a tool for processing heat exchange tubes, and particularly to a tool arrangement for processing heat exchange tubes with reduced weight and increased efficiency. Background Art

[0002] The problem of heat conduction is involved in many fields of refrigeration and air-conditioning technology and energy technology. In these fields, tube bundle heat exchangers are often used for heat conduction. The heat exchange tube, which is a key component in the tube bundle heat exchanger, is the core determining its processing cost and heat exchange efficiency. There are various forms of heat exchange tubes, but currently, finned tubes are the most widely used.

[0003] As a heat exchange and heat dissipation component, finned tubes have been widely used in many industries such as refrigeration, chemical industry, and metallurgy. Finned tubes mainly improve the heat exchange efficiency by increasing the heat conduction area. Currently, finned tubes are usually made into an integral spiral shape. This integral spiral finned tube is directly rolled with spiral fins on the surface of a metal pipe fitting. The fins themselves are part of the metal pipe, and there are no problems such as gap thermal resistance, so it is very popular. However, with the steady development of various industries, the concepts of energy conservation, high efficiency, and low cost are required more and more. As a common component in the fields of refrigeration, heat transfer, etc., the integral finned tube has also been continuously optimized with the development of the times.

[0004] In the prior art, integral finned tubes are mainly produced by three-roll (there are also four-roll) rotary rolling technology (see publication number CN 102019321 A). The tools for three-roll rotary rolling usually adopt the arrangement and combination methods as shown in Figure 1 and Figure 2 for application. The main characteristics of the arrangement shown in Figure 1 are as follows: the blades are edge-ground blades, the relative arrangement is simple, the error tolerance is relatively high, the tool service life is slightly higher, and the processed fins are triangular, etc. Figure 2 Shown in

[0005] is another arrangement of the existing well-known technology. The main characteristics are as follows: the blades are unground blades, the relative tool cost is low, the weight per unit length of the processed finned tube is slightly lower, and the gaskets can be reused.

[0006] For further development, such as patent CN 201310102620.1, this solution mainly achieves the thinning of the fin thickness and the purpose of cost saving by combining tools with different thicknesses and keeping the transition stage unchanged, and through different combinations of the final shaping blades and gaskets. Summary of the Invention

[0007] In response to the requirements in the prior art, the present invention provides a tool arrangement for processing heat exchange tubes with reduced weight and increased efficiency.

[0008] A tool arrangement for reducing weight and increasing efficiency in the processing of heat exchange tubes, including a main shaft, a transition blade fixedly sleeved on the main shaft, a shaping blade, a transition gasket sandwiched between the transition blades, a shaping gasket sandwiched between the shaping blades, a positioning gasket sandwiched between the transition blade and the shaping blade, a washer and a nut for locking and fixing the blades. Among them, the shaping blade is a multi-blade combination with the largest outer diameter, and the transition blade is a multi-blade combination with an increasingly larger outer diameter except for the blade with the largest outer diameter, keeping the thickness of the transition blade unchanged; increasing the thickness of the last shaping blade to make the thickness of other shaping blades the same as that of the transition blade; the thicknesses of the transition gasket and the shaping gasket are the same. It is characterized in that: it also includes a flat head blade arranged behind the shaping blade, a shaping gasket clamped between the shaping blade and the flat head blade, and a shaping gasket clamped between the flat head blades. The transition arc between the shaping blade and the transition blade is 0.03 mm to 0.15 mm, and the transition arcs of the shaping blade and the transition blade are the same; the transition arc of the flat head blade is 0.01 mm to 0.04 mm, and the ratio of the transition arcs of the shaping blade and the flat head blade is greater than or equal to 2.5, and the outer diameter of the flat head blade is greater than or equal to the outer diameter of the shaping blade.

[0009] Furthermore: the thickness of the flat head blade is greater than or equal to the thickness of the shaping blade.

[0010] Furthermore: the inner diameters of the flat head blade, the shaping blade, the shaping gasket, the transition gasket and the transition blade are the same.

[0011] Furthermore: the thickness of the blades in the tool arrangement is 0.2 - 2.5 mm.

[0012] Furthermore: the number of blades in a set of knives in the tool arrangement is 2 to 50, and the outer diameter size of the blades in the tool arrangement is 20 mm to 300 mm; the number of gaskets in a set of knives in the tool arrangement is 1 to 50, and the outer diameter size of the gaskets in the tool arrangement is 18 mm to 295 mm.

[0013] Furthermore: when the tool arrangement is used on a fin forming machine, 3 to 6 sets of knives need to be used simultaneously according to the number of rolling heads of the equipment.

[0014] Furthermore: the tool arrangement can be a single knife group arrangement, or a double knife or multi-knife group arrangement with spacer gaskets added.

[0015] The beneficial effects of the present invention: 1. The use of the transition blade in the present invention is the same as that in the prior art, ensuring the stability in the processing process.

[0016] 2. In the present invention, the change of the transition arc of the flat head blade enables more redundant metal materials at the root of the fin to flow towards the fin part, thereby making the fin height higher, which is beneficial for further processing of three-dimensional fins. At the same time, the heat transfer area of the fin part is increased, thus enhancing the heat transfer effect of the heat exchange tube.

[0017] 3. In the present invention, by changing the arrangement of the flat head blades, higher external fin heights can be processed using thinner tube blank wall thicknesses. At the same time, the proportion of the fin root part is smaller, and the application of the flat head blade is beneficial for the axial extension of the metal during the processing. Therefore, the unit length weight of the heat exchange tube can be significantly reduced, thereby achieving the obvious purpose of weight reduction and reducing the cost of using the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the tool arrangement processing model of the prior art;

[0019] Figure 2 is the tool arrangement processing model of another prior art;

[0020] Figure 3 is the structural schematic diagram of the transition blade or sizing blade;

[0021] Figure 4 is Figure 3 the enlarged structural schematic diagram of region C in

[0022] Figure 5 is the tool arrangement processing model of the present invention;

[0023] Figure 6 is the structural schematic diagram of the flat head blade in the present invention;

[0024] Figure 7 is Figure 6 the enlarged structural schematic diagram of region B in

[0025] Figure 8 is the tool arrangement processing model of another embodiment of the present invention;

[0026] Figure 9 is the structural schematic diagram of the flat head blade in another embodiment of the present invention;

[0027] Figure 10 is Figure 9 the enlarged structural schematic diagram of region A in

[0028] In the figures, 1. Transition blade; 2. Transition gasket; 3. Sizing gasket; 4. Sizing blade; 5. Flat head blade; 6. Washer; 7. Nut; 8. Spindle; 11. Tube blank to be processed; 12. Mandrel; 13. Transition fin; 15. Sizing fin; 16. Processing section; R. Transition arc. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings. Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention. The orientation terms such as left, middle, right, up, and down in the examples of the present invention are only relative concepts to each other or are referenced based on the normal use state of the product, and should not be considered restrictive.

[0030] Example 1, as Figure 3 to Figure 7 shown, according to the tool arrangement for processing heat exchange tubes in this embodiment to reduce weight and increase efficiency, it includes a main shaft 8, a transition blade 1 fixedly sleeved on the main shaft 8, a shaping blade 4, a transition gasket 2 sandwiched between the transition blades 1, a shaping gasket 3 sandwiched between the shaping blades 3, a positioning gasket 3 sandwiched between the transition blade 1 and the shaping blade 4, washers 6 and nuts 7 for locking and fixing the blades. Among them, the shaping blade 4 is a multi-blade combination with the largest outer diameter, and the transition blade 1 is a multi-blade combination with an outer diameter gradually increasing except for the blade with the largest outer diameter. Keep the thickness of the transition blade 1 unchanged, increase the thickness of the last shaping blade 4, and make the thickness of the other shaping blades 4 the same as that of the transition blade 1; the thicknesses of the transition gasket 2 and the shaping gasket 3 are the same. It is characterized in that: it further includes a flat head blade 5 arranged behind the shaping blade 4, a shaping gasket 3 clamped between the shaping blade 4 and the flat head blade 5, a shaping gasket 3 clamped between the flat head blades 5. The transition arc of the shaping blade 4 and the transition blade 1 is 0.03 mm to 0.15 mm, and the transition arcs of the shaping blade 4 and the transition blade 1 are the same; the transition arc of the flat head blade 5 is 0.01 mm to 0.04 mm, and the ratio of the transition arcs of the shaping blade 4 and the flat head blade 5 is greater than or equal to 2.5, and the outer diameter of the flat head blade 5 is greater than or equal to the outer diameter of the shaping blade 4.

[0031] In this embodiment, an arrangement of unsharpened blades and spacers is adopted. The thickness of the transition blade 1 is 0.4 mm, and its transition arc is 0.1 mm. There are a total of 9 transition blades from left to right, and the outer diameters of the blades are 65.4 mm, 65.6 mm, 65.8 mm, 66 mm, 66.2 mm, 66.4 mm, 66.6 mm, 66.8 mm, and 67 mm in sequence. In the middle of the transition blade 1, there are 8 transition spacers 2 with a thickness of 0.25 mm and an outer diameter of 64 mm. The combination of the transition blade 1 and the transition spacer 2 is used to cut the metal on the surface of the to-be-processed tube blank 11 to form gradually increasing transition fins 13 on the surface of the tube blank 11, and at the same time cooperate with the core head 12 to form internal teeth. In this embodiment, the thickness of the sizing blade 4 is 0.4 mm, the outer diameter is 67.1 mm, the transition arc is 0.1 mm, and the thickness of the sizing spacer 3 is 0.25 mm and the outer diameter is 64 mm. Finally, in this embodiment, the thickness of the flat head blade 5 is 0.4 mm, the outer diameter is 67.1 mm, and the transition arc is 0.02 mm.

[0032] In addition, the thickness of the flat head blade is greater than or equal to the thickness of the sizing blade, and the inner diameters of the flat head blade, the sizing blade, the sizing spacer, the transition spacer, and the transition blade are the same. When the tool arrangement is used on a fin forming machine, 3 to 6 groups of tools need to be used simultaneously according to the number of rolling heads of the equipment. The tool arrangement can be a single tool group arrangement, or a double or multi-tool group arrangement with spacer gaskets.

[0033] In the rolling process of this embodiment, a three-axis thread rolling machine is used for processing, and the diameter of the tube blank used for processing is 19 mm and the wall thickness is 1.0 mm. After adopting the above tool arrangement, the fin height is 0.85 mm, the bottom wall thickness is 0.6 mm, and the unit weight is 0.44 kg / m. At the same time, in order to more clearly illustrate the advantages of the present invention in this embodiment, the following Figure 1 processing method is adopted to process the same tube blank, and the results are that the fin height is 0.75 mm, the bottom wall thickness is 0.6 mm, and the unit weight is 0.45 kg / m.

[0034] In the second embodiment, under the condition that other technical features are the same as those in the first embodiment, the thickness of the transition blade 1 is 0.7 mm, the transition arc is 0.1 mm, and the outer diameters from left to right are 65.4 mm, 65.6 mm, 65.8 mm, 66 mm, 66.2 mm, 66.4 mm, 66.6 mm, 66.8 mm, and 67 mm in sequence. The thickness of the sizing blade 4 is 0.7 mm, the transition arc is 0.1 mm, and the outer diameter is 67.1 mm, with a total of 2 pieces; in this embodiment, the diameter of the tube blank used is 19 mm and the wall thickness is 1.04 mm. During the processing test, the fin height processed is 0.8 mm, the bottom wall thickness is 0.6 mm, and the unit weight is 0.460 kg / m. Combined with FIGS. 8 to Figure 10As shown, the thickness of the transition blade 1 is 0.7 mm, the transition arc is 0.1 mm, and the outer diameters from left to right are 65.4 mm, 65.6 mm, 65.8 mm, 66 mm, 66.2 mm, 66.4 mm, 66.6 mm, 66.8 mm, 67 mm. The thickness of the sizing blade 4 is 0.7 mm, its transition arc is 0.1 mm, and its outer diameter is 67.1 mm, with a total of 1 piece; the thickness of the flat head blade 5 is 0.7 mm, its transition arc is 0.1 mm, and its outer diameter is 67.1 mm, with a total of 1 piece. During the processing test, the fin height is 0.85 mm, the bottom wall thickness is 0.6 mm, and the unit weight is 0.450 kg / m. It can be seen from this that the tool arrangement of the present invention can effectively process a higher outer fin height, while the proportion of the fin root part is smaller, and the application of the flat head blade is beneficial to the axial extension of the metal during the processing, so the unit length weight of the heat exchange tube can be significantly reduced, thus achieving the obvious purpose of weight reduction and reducing the cost of using the heat exchange tube.

[0035] In this embodiment, copper is selected as the material, and the blade is made of quenched steel, and its heat treatment hardness is greater than HRC60, which is suitable for processing copper finned tubes.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A tool arrangement for processing heat exchange tubes to reduce weight and increase efficiency, including a main shaft, a transition blade fixedly sleeved on the main shaft, a shaping blade, a transition gasket sandwiched between the transition blades, a shaping gasket sandwiched between the shaping blades, a positioning gasket sandwiched between the transition blade and the shaping blade, a washer and a nut for locking and fixing the blades. Among them, the shaping blade is a multi-blade combination with the largest outer diameter, and the transition blade is a multi-blade combination with an increasing outer diameter except for the blade with the largest outer diameter, keeping the thickness of the transition blade unchanged; increasing the thickness of the last shaping blade while making the thickness of other shaping blades the same as that of the transition blade; the thicknesses of the transition gasket and the shaping gasket are the same. Characterized in that: It further includes a flat head blade arranged behind the shaping blade, a shaping gasket clamped between the shaping blade and the flat head blade, and a shaping gasket clamped between the flat head blades. The transition arc between the shaping blade and the transition blade is 0.03 mm to 0.15 mm, and the transition arcs of the shaping blade and the transition blade are the same; the transition arc of the flat head blade is 0.01 mm to 0.04 mm, and the ratio of the transition arcs of the shaping blade and the flat head blade is greater than or equal to 2.

5. The outer diameter of the flat head blade is greater than or equal to the outer diameter of the shaping blade; the flat head blade and the shaping blade have the same thickness. The combination of the transition blade and the transition gasket is used to cut the metal on the surface of the tube blank to be processed, so that gradually increasing transition fins are formed on the surface of the tube blank, and at the same time, inner teeth are formed in cooperation with the core head. The flat head blade is used for the axial extension of the metal during the processing.

2. A tool arrangement for processing heat exchange tubes to reduce weight and increase efficiency according to claim 1, Characterized in that: The thickness of the flat head blade is greater than or equal to the thickness of the shaping blade.

3. A tool arrangement for processing heat exchange tubes to reduce weight and increase efficiency according to claim 1, Characterized in that: The inner diameters of the flat head blade, the shaping blade, the shaping gasket, the transition gasket and the transition blade are the same.

4. A tool arrangement for processing heat exchange tubes to reduce weight and increase efficiency according to claim 1, Characterized in that: The thickness of the blades in the tool arrangement is 0.2 - 2.5 mm.

5. A tool arrangement for processing heat exchange tubes to reduce weight and increase efficiency according to claim 1, Characterized in that: The number of blades in a set of knives in the tool arrangement is 2 to 50, and the outer diameter of the blades in the tool arrangement is 20 mm to 300 mm; the number of gaskets in a set of knives in the tool arrangement is 1 to 50, and the outer diameter of the gaskets in the tool arrangement is 18 mm to 295 mm.

6. A tool arrangement for processing heat exchange tubes to reduce weight and increase efficiency according to claim 1, Characterized in that: When the tool arrangement is used on a fin forming machine, 3 to 6 sets of knives need to be used simultaneously according to the number of rolling heads of the equipment.

7. A tool arrangement for processing heat exchange tubes to reduce weight and increase efficiency according to claim 1, Characterized in that: The tool arrangement can be a single knife group arrangement, or a double or multi-knife group arrangement with spacer gaskets added.

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