Multi-diversion-groove heat transfer pipe for condensation and preparation method of multi-diversion-groove heat transfer pipe

Abstract

The invention provides a condensation heat transfer tube with multiple diversion trenches and a preparation method thereof, and the preparation method comprises the following steps: processing a tube matrix through a forming device; the forming device comprises three rollers and a threaded core head, the threaded core head is inserted into the pipe base body, and the three rollers rotate to act on the pipe base body so that the pipe base body can rotate and feed at the same time; a rolling cutter set, a grooving cutter and a flat cutter are arranged on a roller, a pipe base body is firstly fed to the rolling cutter set to be machined, the rolling cutter set comprises 11 rolling cutters, a gasket is arranged between every two adjacent rolling cutters, and under the action of the 11 rolling cutters, the outer surface of the pipe base body is gradually deformed and heightened to form a main fin. Then feeding to a grooving cutter and a flat cutter in sequence for processing; the grooving cutter acts on the main fins to form rhombic flow guide grooves and top protrusions. And the side fins are machined and formed on the main fins by the flat cutter. According to the multi-diversion-groove heat transfer pipe for condensation and the preparation method thereof, the energy utilization efficiency and the heat exchange efficiency can be improved, and environmental pollution is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of condensing heat exchange equipment, and in particular to a heat transfer tube and a preparation method thereof. Background Art

[0002] As a traditional high-efficiency heat exchange equipment, shell and tube heat exchangers are widely used in refrigeration, heating, chemical industry, power and other fields. The heat exchange tube is the core heat exchange element of the shell and tube heat exchanger, and its heat exchange performance directly affects the comprehensive heat exchange efficiency of the shell and tube heat exchanger. By improving its heat exchange efficiency, energy waste can be reduced to achieve the effect of energy saving and emission reduction.

[0003] However, in the condensation condition of the conventional heat exchange tube, the condensate is connected to each other on the heat exchange wall of the heat exchange tube to form a condensate film, and the formed condensate film gradually thickens along the gravity direction. Since the conventional heat exchange tube cannot effectively reduce the thickness of the condensate and promote the separation of the condensate, and the condensate film is the main heat transfer resistance between the steam and the heat exchange wall, the heat exchange efficiency of the heat exchanger is low and cannot meet the needs of industrial development. Summary of the invention

[0004] The present invention provides a multi-flow guide groove heat transfer tube for condensation and a preparation method thereof, which can enable condensate to be separated from the fin surface in time, improve energy utilization efficiency, improve heat exchange efficiency, and reduce environmental pollution.

[0005] The technical solution adopted by the present invention is: a method for preparing a multi-flow groove heat transfer tube for condensation, comprising the following steps:

[0006] The tube body is processed by a forming device; the forming device includes three rollers and a threaded core head, the threaded core head is inserted into the tube body, the three rollers are distributed at 120 degrees along the axis, and each roller is provided with a rolling and cutting knife group, one of the rollers is provided with a grooving knife and a flat cutting knife, the three rollers rotate and act on the tube body, so that the tube body performs a compound motion of rotating and feeding;

[0007] The tube substrate is first fed to the rolling cutter group for processing; the rolling cutter group includes 11 rolling cutters arranged side by side. Starting from the first rolling cutter, the outer diameter of each rolling cutter gradually increases, and a gasket is arranged between two adjacent rolling cutters. The outer diameter of the gasket is smaller than the outer diameter of each rolling cutter. The 11 rolling cutters process the tube substrate at the same time. Under the joint action of the 11 rolling cutters and multiple gaskets, the outer surface of the tube substrate gradually deforms and increases along the gap to form the main fin;

[0008] Then, the tube substrate is fed to the grooving knife and the flat cutting knife for processing in turn; the grooving knife acts on the main fin to form rhombus guide grooves evenly spaced along the circumferential direction, and at the same time, the part of the main fin not acted by the grooving knife forms a top protrusion, wherein the top protrusion is higher than the rhombus guide groove; the flat cutting knife squeezes the copper plastic material on the main fin that is not cut by the grooving knife, so that the copper plastic material is deformed in the axial and axial directions to form staggered side fins on the main fin.

[0009] Furthermore, there is a feed angle between each of the rolling rollers and the axis of the tube substrate, and each feed angle is 42°.

[0010] Furthermore, the outer diameter of each of the rolling cutters gradually increases by 0.3 mm, and the outer diameter of the 11 rolling cutters increases from 65.3 mm to 67.2 mm.

[0011] Furthermore, the outer diameters of the last two rolling cutters are both 67.2 mm.

[0012] Furthermore, the thickness of the gasket is 0.254 mm.

[0013] Furthermore, the outer diameter of the grooving knife is smaller than the outer diameter of the flat cutting knife.

[0014] Furthermore, the outer diameter of the flat cutting knife is 66.3-66.6 mm, and the outer diameter of the grooving knife is 65.7-66 mm.

[0015] Furthermore, the threaded core head acts on the inside of the tube substrate to form an inner spiral fin.

[0016] The present invention also provides the following technical solutions:

[0017] A multi-guide groove heat transfer tube for condensation is made by the preparation method, comprising: a tube base, the outer surface of which is spirally formed with two-dimensional spiral outer fins; the two-dimensional spiral outer fins include main fins, both sides of the main fins extend along the circumferential direction to form side fins, the multiple side fins are staggered, and the multiple side fins between adjacent main fins are also staggered; the top of the main fin is equidistantly provided with multiple top protrusions, rhombus-shaped guide grooves are formed between adjacent top protrusions, and the top protrusions are higher than the rhombus-shaped guide grooves.

[0018] Furthermore, 300 to 400 side fins are arranged in one circle; and 150 to 200 diamond-shaped guide grooves are arranged in one circle.

[0019] Compared with the prior art, the multi-guide groove heat transfer tube for condensation of the present invention and the preparation method thereof form diamond-shaped guide grooves and two-dimensional spiral outer fins on the outer surface of the tube substrate, wherein the two-dimensional spiral outer fins include staggered side fins, top protrusions and main fins, and the above-mentioned multiple structures together constitute a complex flow channel, so that the capillary force and surface tension of the flow channel are greater; as the steam exchanges heat with the heat transfer tube, condensate is formed on the surface of the two-dimensional spiral outer fins, and the diamond-shaped guide grooves can promote the condensate to flow into the complex flow channel and leave the two-dimensional spiral outer fin surface in time; in addition, multiple diamond-shaped guide grooves and multiple staggered side fins can provide more heat exchange area and prevent the individual condensate droplets from connecting to each other to form a condensate film, thereby effectively improving the heat exchange efficiency, improving energy utilization efficiency, and reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but should not constitute a limitation of the present invention.

[0021] Figure 1 : A three-dimensional diagram of a multi-flow-guiding-groove heat transfer tube for condensation of the present invention;

[0022] Figure 2 : The present invention Figure 1 Side view along the axial direction;

[0023] Figure 3 : The present invention Figure 1 A side view along the circumferential direction;

[0024] Figure 4 : The present invention Figure 1 A top view of

[0025] Figure 5 : The present invention Figure 1 Bottom view of

[0026] Figure 6 : Schematic diagram of the preparation of the multi-flow groove heat transfer tube for condensation of the present invention;

[0027] Figure 7 : Another schematic diagram of preparing the multi-flow groove heat transfer tube for condensation of the present invention. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0029] like Figure 1 , Figure 2 and Figure 4As shown, the multi-flow groove heat transfer tube for condensation of the present invention comprises a tube base 1, and the outer surface of the tube base 1 is spirally formed with a two-dimensional spiral outer fin. The two-dimensional spiral outer fin comprises a main fin 2, and the main fin 2 is extended along both sides of the circumferential direction to form a side fin 3, and the multiple side fins 3 are staggered, and the multiple side fins 3 between adjacent main fins 2 are also staggered. Further, 300 to 400 side fins 3 are arranged in one circumference.

[0030] like Figures 1 to 3 As shown, in addition, the top of each main fin 2 is provided with a plurality of top protrusions 4, and rhombus-shaped flow guide grooves 5 are formed between adjacent top protrusions 4, and the top protrusions 4 are higher than the rhombus-shaped flow guide grooves 5. Furthermore, 150 to 200 rhombus-shaped flow guide grooves 5 are provided in one circumference.

[0031] In the present invention, by arranging diamond guide grooves 5, staggered side fins 3, top protrusions 4 and main fins 2 on the outer surface of the tube base 1, multiple structures form a complex flow channel, so that the capillary force and surface tension of the flow channel are greater; as the steam exchanges heat with the heat transfer tube, condensate is formed on the surface of the two-dimensional spiral outer fins, and the diamond guide grooves 5 can promote the condensate to flow into the complex flow channel and leave the two-dimensional spiral outer fin surface in time. Multiple diamond guide grooves 5 and multiple staggered side fins 3 can provide more heat exchange area and prevent individual condensate droplets from connecting to each other to form a condensate film.

[0032] like Figure 1 and Figure 5 As shown, in addition, the inner surface of the tube base 1 is also formed with inner spiral fins 6 to increase the turbulence in the heat transfer tube, thereby improving the convection heat transfer efficiency of the heat exchange tube.

[0033] like Figure 6 and Figure 7 As shown, the present invention also provides a multi-flow groove heat transfer tube for condensation and a preparation method thereof, comprising the following steps:

[0034] The tube base 1 is processed by a forming device; the forming device includes three rollers 9 and a threaded core head 8, the threaded core head 8 is inserted in the tube base 1, and the three rollers 9 are distributed along the axis at 120°, so that there is a feed angle between each roller 9 and the axis of the tube base 1; and each roller 9 is provided with a rolling and cutting knife group, one of which is provided with a grooving knife 11 and a flat cutting knife 12. When the three rollers 9 rotate and act on the tube base 1, the acting force is divided into an axial force and a circumferential force, so that the tube base 1 performs a compound motion of rotating and feeding. In this step, the angle of each feed angle is 42°.

[0035] The tube substrate 1 is first fed to the rolling cutter group for processing; the rolling cutter group includes 11 rolling cutters 10 arranged side by side. Starting from the first rolling cutter 10, the outer diameter of each rolling cutter 10 gradually increases by 0.3 mm, and the outer diameter of the 11 rolling cutters 10 increases from 65.3 mm to 67.2 mm. A gasket 13 is arranged between two adjacent rolling cutters 10, and the outer diameter of the gasket 13 is smaller than the outer diameter of each rolling cutter 10. The 11 rolling cutters 10 process the tube substrate 1 at the same time. Under the joint action of the 11 rolling cutters 10 and multiple gaskets 13, the outer surface of the tube substrate 1 is gradually deformed and increased to form the main fin 2.

[0036] In this step, the external diameters of the last two rolling cutters 10 (that is, the tenth and the eleventh rolling cutters 10) are 67.2mm, which plays a shaping effect. In addition, the thickness of the pad 13 is 0.254mm.

[0037] Then, the tube substrate 1 is fed to the grooving knife 11 and the flat cutting knife 12 in sequence for processing; wherein, the outer diameter of the grooving knife 11 is smaller than the outer diameter of the flat cutting knife 12, and the grooving knife 11 acts on the main fin 2 to form rhombus guide grooves 5 distributed at equal intervals along the circumferential direction, and at the same time, the part of the main fin 2 not acted by the grooving knife 11 forms a top protrusion 4; the flat cutting knife 12 squeezes the copper plastic material on the main fin 2 that is not cut off by the grooving knife 11, so that the copper plastic material is deformed in the axial and axial directions (perpendicular to the axial direction), and forms staggered side fins 3 on the main fin 2.

[0038] In this step, the outer diameter of the flat cutting knife 12 is 66.3-66.6 mm, and the outer diameter of the grooving knife 11 is 65.7-66 mm.

[0039] During the entire forming process of the two-dimensional spiral outer fins, the threaded core head 8 plays a role in stabilizing the tube base body 1 and forming the inner spiral fins 6 inside the tube base body 1 .

[0040] In summary, the multi-flow groove heat transfer tube for condensation and the preparation method thereof of the present invention have the following advantages:

[0041] 1. A complex flow channel is formed by forming a diamond-shaped guide groove 5, staggered side fins 3, top protrusions 4 and main fins 2 on the outer surface of the tube substrate 1, so that the capillary force and surface tension of the flow channel are greater; as the steam exchanges heat with the heat transfer tube, condensate is formed on the surface of the two-dimensional spiral outer fins, and the diamond-shaped guide grooves 5 can promote the condensate to flow into the complex flow channel and leave the two-dimensional spiral outer fin surface in time. Multiple diamond-shaped guide grooves 5 and multiple staggered side fins 3 can provide more heat exchange area and prevent the condensate droplets from connecting to each other to form a condensate film, thereby effectively improving the heat exchange efficiency, improving the energy utilization efficiency and reducing environmental pollution.

[0042] 2. The multi-guide groove heat transfer tube for condensation of the present invention is integrally formed, has good forming quality, stable structure, and the two-dimensional spiral outer fins are not easy to fall off.

[0043] As long as it does not violate the creative ideas of the present invention, any combination of the various embodiments of the present invention shall be regarded as the contents disclosed by the present invention; within the technical concept of the present invention, any combination of various simple modifications of the technical scheme and different embodiments that does not violate the creative ideas of the present invention shall be within the protection scope of the present invention.

Claims

1. A method for preparing a multi-flow groove heat transfer tube for condensation, characterized in that: The following steps are involved: The tube base (1) is processed by a forming device; the forming device comprises three rollers (9) and a thread core (8); the thread core (8) is inserted into the tube base (1); the three rollers (9) are distributed at 120 degrees along the axis, and each roller (9) is provided with a rolling and cutting knife group, one of the rollers (9) is provided with a grooving knife (11) and a flat cutting knife (12); the three rollers (9) rotate and act on the tube base (1), so that the tube base (1) performs a compound motion of rotating and feeding; The tube substrate (1) is first fed to a rolling cutter group for processing; the rolling cutter group comprises 11 rolling cutters (10) arranged side by side, starting from the first rolling cutter (10), the outer diameter of each rolling cutter (10) gradually increases, and a gasket (13) is arranged between two adjacent rolling cutters (10), the outer diameter of the gasket (13) is smaller than the outer diameter of the rolling cutter, and the 11 rolling cutters (10) process the tube substrate (1) at the same time, and under the joint action of the 11 rolling cutters (10) and the plurality of gaskets (13), the outer surface of the tube substrate (1) gradually deforms and increases, forming a main fin (2); Then, the tube base (1) is fed to the grooving knife (11) and the flat cutting knife (12) in sequence for processing; the grooving knife (11) acts on the main fin (2) to form rhombus-shaped flow guide grooves (5) distributed at equal intervals along the circumferential direction, and at the same time, the portion of the main fin (2) not acted by the grooving knife (11) forms a top protrusion (4), wherein the top protrusion (4) is higher than the rhombus-shaped flow guide groove (5); the flat cutting knife (11) squeezes the copper plastic material on the main fin (2) that is not cut by the grooving knife (11), so that the copper plastic material is deformed in the axial direction and the axial center direction, and staggered side fins (3) are formed on the main fin (2).

2. The method for preparing a multi-flow groove heat transfer tube for condensation as claimed in claim 1, characterized in that: There is a feed angle between each of the rolling rollers (9) and the axis of the tube base (1), and each feed angle is 42°.

3. The method for preparing a multi-flow groove heat transfer tube for condensation as claimed in claim 1, characterized in that: The outer diameter of each rolling cutter (10) gradually increases by 0.3 mm, and the outer diameters of the 11 rolling cutters (10) increase from 65.3 mm to 67.2 mm.

4. The method for preparing a multi-flow groove heat transfer tube for condensation as claimed in claim 3, characterized in that: The outer diameters of the last two rolling cutters (10) are both 67.2 mm.

5. The method for preparing a multi-flow groove heat transfer tube for condensation as claimed in claim 1, characterized in that: The thickness of the gasket (13) is 0.254 mm.

6. The method for preparing a multi-flow groove heat transfer tube for condensation as claimed in claim 1, characterized in that: The outer diameter of the grooving knife (11) is smaller than the outer diameter of the flat cutting knife (12).

7. The method for preparing a multi-flow groove heat transfer tube for condensation as claimed in claim 6, characterized in that: The outer diameter of the flat cutting knife (12) is 66.3-66.6 mm, and the outer diameter of the grooving knife (11) is 65.7-66 mm.

8. The method for preparing a multi-flow groove heat transfer tube for condensation as claimed in claim 1, characterized in that: The threaded core head (8) acts on the inside of the tube base (1) to form an inner spiral fin (6).

9. A multi-channel heat transfer tube for condensation, characterized in that: It is manufactured by the preparation method according to any one of claims 1 to 8, comprising: a tube base (1), the outer surface of which is spirally formed with a two-dimensional spiral outer fin; the two-dimensional spiral outer fin comprises a main fin (2), the main fin (2) is provided with side fins (3) extending on both sides along the circumferential direction, a plurality of side fins (3) are arranged in a staggered manner, and a plurality of side fins (3) between adjacent main fins (2) are also arranged in a staggered manner; a plurality of top protrusions (4) are equidistantly arranged on the top of the main fin (2), a rhombus-shaped guide groove (5) is formed between adjacent top protrusions (4), and the top protrusions (4) are higher than the rhombus-shaped guide groove (5).

10. The multi-channel heat transfer tube for condensation as claimed in claim 9, characterized in that: 300 to 400 side fins (3) are arranged in one circle; and 150 to 200 diamond-shaped flow guide grooves (5) are arranged in one circle.

Images