CN111059954A - Heat exchange tube, air conditioner and process method for preparing heat exchange tube - Google Patents
Heat exchange tube, air conditioner and process method for preparing heat exchange tube Download PDFInfo
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- CN111059954A CN111059954A CN201911348861.8A CN201911348861A CN111059954A CN 111059954 A CN111059954 A CN 111059954A CN 201911348861 A CN201911348861 A CN 201911348861A CN 111059954 A CN111059954 A CN 111059954A
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- 238000000034 method Methods 0.000 title abstract description 28
- 230000008569 process Effects 0.000 title abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 91
- 239000002184 metal Substances 0.000 claims abstract description 91
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 42
- 230000009471 action Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 3
- 239000003507 refrigerant Substances 0.000 abstract description 33
- 238000012546 transfer Methods 0.000 abstract description 30
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 10
- 230000008859 change Effects 0.000 description 8
- 239000011521 glass Substances 0.000 description 7
- 238000004378 air conditioning Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000005489 elastic deformation Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
- F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
- F28F13/125—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation by stirring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/02—Details of evaporators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/04—Details of condensers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to a heat exchange tube, wherein a spiral metal wire penetrates through the heat exchange tube, the spiral metal wire extends along the length direction of the heat exchange tube, the maximum outer diameter D1 of the spiral metal wire is smaller than the inner diameter D2 of the heat exchange tube, one end of the spiral metal wire is fixed at the inlet of the heat exchange tube, and the other end of the spiral metal wire is fixed at the outlet of the heat exchange tube. The helical wire is elastically deformable. The spiral metal wire is assembled inside the heat exchange tube by adopting the negative pressure formed during the vacuumizing process, the preparation method is simple and efficient, and the spiral metal wire can be completely assembled inside the heat exchange tube. The heat exchange tube disturbs laminar flow of the refrigerant in the tube, so that the refrigerant flows in the heat exchange tube in a turbulent flow mode, energy exchange of the refrigerant in the direction perpendicular to the tube wall is facilitated, the problem of insufficient heat exchange between the refrigerant and the external environment is solved, the heat exchange area of the heat exchanger is fully utilized, the energy efficiency of an air conditioner with the controller is improved, and heat transfer resistance is reduced.
Description
Technical Field
The invention relates to a heat exchange tube, an air conditioner and a process method for preparing the heat exchange tube, and particularly belongs to the technical field of heat exchangers.
Background
In the field of the existing heat exchanger, the heat transfer area is increased only by adding an aluminum foil fin to enhance the heat transfer area of the heat exchanger, so that the heat transfer amount of the convection heat exchanger is increased, besides, according to a heat transfer chemical formula Q-K A △ t, K is a heat transfer coefficient, A is a heat transfer area, △ t is a heat transfer temperature difference, it can be seen that the heat transfer amount is increased, not only the heat transfer area A can be increased, but also the heat transfer can be enhanced by increasing the heat transfer coefficient K of the convection heat, and the method for increasing the heat transfer coefficient of the convection heat comprises the steps of increasing the flow velocity of fluid in the heat exchanger, increasing the turbulence degree of the fluid, or changing the material of the heat exchanger into a material with a high heat transfer coefficient, arranging a turbulence object in the heat exchanger, and reducing the thickness of a laminar boundary layer.
Disclosure of Invention
In view of the above, the present invention provides a heat exchange tube disposed in a heat exchanger. The heat exchange tube is internally provided with the spiral metal wire which is used for disturbing the flow of the refrigerant flowing through the heat exchange tube to change the refrigerant from laminar flow to turbulent flow, the heat transfer is enhanced by utilizing the characteristic that the temperature change rate in the turbulent flow boundary layer is far greater than that in the laminar flow boundary layer, the outer diameter of the spiral metal wire is close to the inner wall of the heat exchange tube but is not contacted with the inner wall of the heat exchange tube, the area of the laminar flow bottom layer between the turbulent flow boundary layer and the inner wall of the heat exchange tube is increased as much as possible, the thickness of the laminar flow bottom layer is reduced, and the. The invention is used for solving the problem that the heat exchange area of the heat exchanger cannot be fully utilized due to insufficient heat exchange between the refrigerant of the heat exchange tube and the external environment. The problem of large heat transfer resistance caused by a laminar bottom layer when a refrigerant flows is solved. The process method for preparing the heat exchange tube simultaneously solves the problems of high assembly difficulty and long assembly and processing time when the turbulent flow object is arranged in the heat exchange tube. The invention also provides an air conditioner, and the heat exchanger of the air conditioner adopts the heat exchange tube of the invention, so that the problem that the energy efficiency of the air conditioner cannot meet the requirement due to poor heat exchange effect of the air conditioner can be solved.
Has the advantages that:
the invention provides a heat exchange tube arranged in a heat exchanger. The spiral metal wires are arranged in the heat exchange tube along the axial direction of the heat exchange tube, and the refrigerant bypasses the spiral metal wires to generate vortexes to destroy a laminar boundary layer of the refrigerant in the heat exchange tube, so that the refrigerant flowing in the heat exchange tube forms a turbulent flow region, the temperature change rate in the direction perpendicular to the tube wall is increased, and the heat transfer efficiency is increased. The outer diameter of the spiral metal wire is close to the inner wall of the heat exchange tube but is not contacted with the inner wall of the heat exchange tube, the area of the laminar bottom layer between the turbulent flow boundary layer and the inner wall of the heat exchange tube is increased as much as possible, and the thickness of the laminar bottom layer is reduced, so that the thermal resistance of the laminar bottom layer in the heat transfer process is reduced, and the heat exchange efficiency of a refrigerant in the heat exchange tube and the external environment is further improved. The heat exchanger of the air conditioner is provided with the heat exchange tube, so that the heat transfer efficiency is improved, the heat exchange area is more fully utilized, the energy efficiency of the air conditioner is improved, and the energy consumption is lower under the condition of the same refrigerating capacity. According to the process method for preparing the heat exchange tube, the spiral metal wire can be efficiently and quickly arranged in the heat exchange tube comprising the straight tube section and the bent tube section through the pressure difference formed by vacuumizing, so that the spiral metal wire is higher and more convenient to assemble.
Specifically, the method comprises the following steps:
the invention relates to a heat exchange tube, wherein a spiral metal wire penetrates through the heat exchange tube, the spiral metal wire extends along the length direction of the heat exchange tube, the maximum outer diameter D1 of the spiral metal wire is smaller than the inner diameter D2 of the heat exchange tube, one end of the spiral metal wire is fixed at the inlet of the heat exchange tube, and the other end of the spiral metal wire is fixed at the outlet of the heat exchange tube.
Further alternatively, the helical wire may be elastically deformable.
Further alternatively, the radius of curvature of the helical wire is constant along the length of the heat exchange tube.
Further optionally, the heat exchange tube is provided with a straight tube section and a bent tube section, and the turn density of the spiral metal wire in the bent tube section is smaller than that of the straight tube section.
Further optionally, the difference between the maximum outer diameter D1 of the spiral wire and the inner diameter D2 of the heat exchange tube is Δ D2-D1, and the value range of Δ D is (0mm,1 mm).
Further alternatively, the helical wire has a stiffness of [1400N/m,1600N/m ].
Further optionally, the first copper ring and the second copper ring are respectively welded at the heat exchange tube inlet and the heat exchange tube outlet, one end of the spiral metal wire is fixed on the first copper ring, and the other end of the spiral metal wire is fixed on the second copper ring, so that one end of the spiral metal wire is fixed at the heat exchange tube inlet through the first copper ring, and the other end of the spiral metal wire is fixed at the heat exchange tube outlet through the second copper ring.
The invention also relates to a process method for preparing the heat exchange tube, which comprises the following steps:
s1: fixedly connecting one end of a spiral metal wire to an elastically deformable piston, and fixing the other end of the spiral metal wire on the inner wall of a first copper ring;
s2: one end of the elastically deformable piston, which is not connected with the spiral metal wire, is plugged into the heat exchange tube inlet of the heat exchanger, the heat exchange tube outlet is vacuumized, and the spiral metal wire and one end of the metal wire, which is fixedly connected with the elastically deformable piston, move together from the heat exchange tube inlet to the heat exchange tube outlet under the action of pressure difference.
S3: at the moment, one end of the spiral metal wire positioned at the outlet of the heat exchange tube is separated from the elastically deformable piston and then fixed on the inner wall of the second copper ring, and the spiral metal wire is fixed at the outlet of the heat exchange tube through the fixation of the second copper ring and the outlet of the heat exchange tube;
and the first copper ring is fixed with the heat exchange tube inlet of the heat exchanger, so that the other end of the spiral metal wire is fixed with the heat exchange tube inlet.
The invention also provides an air conditioner which comprises an evaporator and a condenser, wherein the evaporator and the condenser adopt any heat exchange tube of the invention, or the heat exchange tubes of the evaporator and the condenser are prepared by the process method for preparing the heat exchange tubes.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.
FIG. 1 is a schematic illustration of preassembly of a helical wire in an embodiment of the present invention;
FIG. 2 is a schematic view of a helical wire installation in an embodiment of the present invention;
FIG. 3 is a schematic view of a heat exchange tube in an embodiment of the present invention;
in the figure:
rubber piston-a 1; helical wire-a 2; a first copper ring-a 3; a second copper ring-a 4; heat exchange tube-a 5; first weld-a 6; second weld-a 7; third weld-A8; fourth weld-a 9; heat exchange tube outlet-a 10; heat exchange tube inlet-a 11; f-is the vacuumizing direction; d1-helical wire outside diameter; d2-inner diameter of the heat exchange pipe;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
[ example 1 ]
The embodiment discloses a heat exchange tube a5, and a spiral wire a2 arranged in the heat exchange tube a5 is a heat transfer enhancement structure of the heat exchange tube a5 in the embodiment. A spiral metal wire A2 penetrates through the heat exchange tube A5, the spiral metal wire A2 extends along the length direction of the heat exchange tube, the maximum outer diameter D1 of the spiral metal wire A2 is smaller than the inner diameter D2 of the heat exchange tube, one end of the spiral metal wire is fixed at the inlet of the heat exchange tube, and the other end of the spiral metal wire is fixed at the outlet of the heat exchange tube. The helical wire a2 is elastically deformable. The bend radius of the helical wire a2 remains constant along the length of the heat exchange tube. The difference between the maximum outer diameter D1 of the spiral metal wire and the inner diameter D2 of the heat exchange tube is D2-D1, and the value range of the delta D is (0mm,1 mm).
The stiffness of the helical wire is [1400N/m,1600N/m ]. Preferably, the helical wire has a stiffness of 1500N/m.
The first copper ring A3 and the second copper ring A4 are respectively welded at a heat exchange tube inlet A11 and a heat exchange tube outlet A10, one end of the spiral metal wire A2 is fixed on the first copper ring A3, and the other end of the spiral metal wire A2 is fixed on the second copper ring A4, so that one end of the spiral metal wire is fixed at the heat exchange tube inlet A11 through the first copper ring A3, and the other end of the spiral metal wire is fixed at the heat exchange tube outlet A10 through the second copper ring A4.
The heat exchange tube is provided with a plurality of straight tube sections and a plurality of bend sections, and the straight tube sections are connected through the bend sections.
Further optionally, the coil density of the helical wire bend section is less than the coil density of the straight section. Generally, the flow velocity of the refrigerant at the bent pipe is larger, and the refrigerant can form turbulent flow by itself, so that the reduction of the turn density of the spiral wire in the bent pipe section of the spiral wire can reduce the fluid resistance of the spiral wire to the bent pipe section, and simultaneously, the refrigerant can form turbulent flow in the bent pipe section.
The embodiment relates to a process method for preparing a heat exchange tube, which comprises the following steps:
s1: fixedly connecting one end of a spiral metal wire A2 to an elastically deformable piston A1, and fixing the other end of the spiral metal wire A2 to the inner wall of a first copper ring A3;
s2: one end of the elastically deformable piston A1, which is not connected with the spiral wire A2, is plugged into a heat exchange tube inlet A11 of the heat exchanger, vacuum is pumped at a heat exchange tube outlet A10, and the spiral wire A2 and one end of the wire connected with the elastically deformable piston A1 move together from the heat exchange tube inlet A11 to the heat exchange tube outlet A10 under the action of pressure difference.
S3: at the moment, one end of the spiral metal wire A2 at the outlet of the heat exchange tube is separated from the elastically deformable piston A1 and then fixed on the inner wall of the second copper ring A4, and is fixed on the outlet A10 of the heat exchange tube through the fixation of the second copper ring A4 and the outlet A10 of the heat exchange tube.
And the first copper ring A3 is fixed with the heat exchange tube inlet A11 of the heat exchanger, so that the other end of the spiral metal wire A2 is fixed with the heat exchange tube inlet A11.
In the embodiment, the inner diameters of the first copper ring and the second copper ring are slightly larger than the outer diameter of the heat exchange tube, and the first copper ring A3 is welded with the inlet A11 of the heat exchange tube to form a first welding part A6; the second copper ring a4 is welded to the heat exchange tube outlet a10 to form a second weld a 7.
One end of the spiral metal wire is welded with the first copper ring A3 to form a third welding part A8; the other end of the helical wire is welded to a second copper ring A4 to form a third weld A9.
The embodiment is further provided with an air conditioner, which comprises an evaporator and a condenser, wherein the evaporator and the condenser adopt the heat exchange tube described in the embodiment, or the heat exchange tubes of the evaporator and the condenser are prepared by adopting the process method for preparing the heat exchange tubes in the embodiment.
The heat exchange tube in this embodiment is a copper heat exchange tube.
Specifically, in the experimental phase of this implementation:
firstly, considering the situation that the spiral elastically deformable metal wire is washed by refrigerant fluid in the heat exchange tube to cause elastic deformation, so that the metal wire is compressed at one position, and further the reinforced heat transfer effect of the component is weakened, and considering the situation that the metal wire is possibly broken due to long-time washing of the metal wire by the refrigerant and the cost problem of the metal wire, a transparent glass tube is necessary to be used firstly, the tube diameter of the transparent glass tube is consistent with the tube diameter of the heat exchange tube to be applied, the transparent glass tube is used for replacing the heat exchange tube of an evaporator, and the spring-shaped metal wire made of different metals is selected for experiments. Firstly, carrying out an installation experiment, namely, mounting the metal wire into the transparent glass tube in a penetrating manner by using the spiral elastically-deformable metal wire according to the process method for preparing the heat exchange tube, and observing the contact condition of the metal wire with the inner wall of the glass tube after the metal wire is mounted, wherein a certain gap is required to be reserved between most of the metal wire and the inner wall of the glass tube. After the installation is finished, water with the same flow rate as the flow rate of a refrigerant in the heat exchanger of the air conditioning system is poured into the pipe, the running state is simulated, the deformation of the metal wire in the glass pipe is observed, the metal wire is prevented from being compressed together, and the metal wire is prevented from being broken. The wire selected by the above experiment. Because different air conditioning system, the heat exchange tube pipe diameter is different, and the velocity of flow difference of refrigerant in the heat exchanger is great, and considers the corrosivity of different refrigerants to the metal, and considers the cost, all need carry out different experiments to different air conditioning system and choose for use the metal material that matches with the air conditioning system who will use. The steel material with high rigidity, high deformation resistance and high corrosion resistance, such as stainless steel, is optimally selected to ensure that the steel material is not subjected to high deformation when being flushed by a refrigerant.
After making spiral elastic deformation's wire, spiral wire length when not taking place elastic deformation will be approximately equal to the total length of heat exchange tube, its diameter slightly is less than the pipe internal diameter, not with pipe wall direct contact, because in general air conditioning system, the refrigerant is not very big at the intraductal velocity of flow of heat exchange, when not being equipped with the spiral elastic deformation's of this embodiment wire in the heat exchange tube, the refrigerant is when just getting into the heat exchange tube, the laminar flow boundary layer is very thin, develop along the heat exchange tube axis direction, the laminar flow boundary layer can constantly thicken, develop the boundary layer intersection, intraductal fluid still can be in the laminar flow state, then the fluid state belongs to the laminar flow state in the intraductal fluid after the full development, boundary layer laminar flow thickness. When the spiral elastically-deformable metal wire is assembled in the heat exchange tube, the metal wire is positioned in a fluid laminar boundary layer, and in the process that a refrigerant flows in the tube, the metal wire is spirally arranged in the heat exchange tube, so the refrigerant can continuously flow around the metal wire and flow through the metal wire, and the refrigerant fluid flows around the metal wire to generate vortex, so that the laminar boundary layer can be damaged, a turbulent flow region, namely a turbulent flow boundary layer, is formed in the heat exchange tube, a laminar bottom layer is formed between the turbulent flow boundary layer and the inner wall of the heat exchange tube, the refrigerant transfers heat in the turbulent flow boundary layer in a convection heat transfer mode, and the laminar bottom layer transfers heat in a heat transfer mode. The beneficial effects are that: the heat exchange on the laminar flow boundary layer can be approximately regarded as heat conduction, the flowing state of a refrigerant in the heat exchange tube is changed from laminar flow to turbulent flow under the action of the metal wire, the heat transfer is enhanced by utilizing the characteristic that the temperature change rate in the turbulent flow boundary layer is far greater than that in the laminar flow boundary layer, the outer diameter of the spiral metal wire is arranged close to the inner wall of the heat exchange tube but is not contacted with the inner wall of the heat exchange tube, the area of the laminar flow bottom layer between the turbulent flow boundary layer and the inner wall of the heat exchange tube is increased as much as possible, the thickness.
The thickness of the laminar boundary layer is reduced, which is equivalent to a heat conduction formula:
the wall thickness d in the heat exchanger is reduced, the heat transfer capacity q in unit area is increased, and because vortex can be continuously generated, the flow along the vertical direction of the pipe wall can be mutually interfered, at the moment, the flow of the refrigerant can be approximately regarded as turbulent flow, a laminar flow bottom layer is arranged between the bottom of a turbulent flow boundary layer and the wall of the heat exchange pipe, the turbulent flow boundary layer is positioned on the laminar flow bottom layer, the temperature change of the fluid is changed in a power function manner, and the temperature change rate is far greater thanThe change rate of the laminar flow boundary layer is increased as much as possible, the thickness of the laminar flow boundary layer is reduced in order to increase the area of the laminar flow bottom layer between the turbulent flow boundary layer and the inner wall of the heat exchange tube, and the difference value between the outer diameter of the spiral metal wire and the inner diameter of the heat exchange tube is (0mm,1 mm)]Preferably 1mm, so that the heat exchange effect of the whole heat exchanger can be increased.
Because the heat exchange tube of the air conditioner is provided with a plurality of straight tube sections and bent tube sections, only the inlet and the outlet of the heat exchange tube are drawn in fig. 2, the heat exchange tube in the middle is omitted, and the inner diameter of the copper ring is slightly larger than that of the heat exchange tube, so that the copper ring can be connected with the heat exchange tube, and the wall thickness of the copper ring is consistent with that of the heat exchange tube, so that the heat exchanger can be successfully installed in.
The device can be applied to various heat exchangers, has wide application prospect, but before being applied to a refrigerating system, the metal wire made of which material is used is verified and determined through the experiment, and the successful matching of the device and the applied refrigerating system is ensured.
[ PROBLEMS ] the present invention
The invention provides a heat exchange tube arranged in a heat exchanger. The spiral metal wires are arranged in the heat exchange tube along the axial direction of the heat exchange tube, and the refrigerant bypasses the spiral metal wires to generate vortexes to destroy a laminar boundary layer of the refrigerant in the heat exchange tube, so that the refrigerant flowing in the heat exchange tube forms a turbulent flow region, the temperature change rate in the direction perpendicular to the tube wall is increased, and the heat transfer efficiency is increased. The outer diameter of the spiral metal wire is close to the inner wall of the heat exchange tube but is not contacted with the inner wall of the heat exchange tube, the area of the laminar bottom layer between the turbulent flow boundary layer and the inner wall of the heat exchange tube is increased as much as possible, and the thickness of the laminar bottom layer is reduced, so that the thermal resistance of the laminar bottom layer in the heat transfer process is reduced, and the heat exchange efficiency of a refrigerant in the heat exchange tube and the external environment is further improved. The heat exchanger of the air conditioner is provided with the heat exchange tube, so that the heat transfer efficiency is improved, the heat exchange area is more fully utilized, the energy efficiency of the air conditioner is improved, and the energy consumption is lower under the condition of the same refrigerating capacity. According to the process method for preparing the heat exchange tube, the spiral metal wire can be efficiently and quickly arranged in the heat exchange tube comprising the straight tube section and the bent tube section through the pressure difference formed by vacuumizing, so that the spiral metal wire is higher and more convenient to assemble.
Claims (10)
1. A heat exchange tube, its characterized in that: run through the heliciform wire in the heat exchange tube, the heliciform wire is followed heat exchange tube length direction extends, just its maximum external diameter D1 of heliciform wire is less than heat exchange tube internal diameter D2, heliciform wire one end is fixed at the heat exchange tube entry, and the other end is fixed at the heat exchange tube export.
2. The heat exchange tube of claim 1, wherein: the helical wire is elastically deformable.
3. The heat exchange tube of claim 2, wherein: the radius of curvature of the helical wire is maintained constant along the length of the heat exchange tube.
4. A heat exchange tube according to claim 3, wherein: the heat exchange tube is provided with a straight tube section and a bent tube section, and the turn density of the spiral metal wire in the bent tube section is smaller than that of the straight tube section.
5. The heat exchange tube of claim 4, wherein: the difference between the maximum outer diameter D1 of the spiral metal wire and the inner diameter D2 of the heat exchange tube is D2-D1, and the value range of the delta D is (0mm,1 mm).
6. The heat exchange tube of claim 5, wherein: the stiffness of the helical wire is [1400N/m,1600N/m ].
7. A heat exchange tube according to any one of claims 1 to 6, wherein: first copper ring and second copper ring weld respectively in heat exchange tube entry and heat exchange tube export, heliciform metal wire one end is fixed on first copper ring, and the other end is fixed on the second copper ring, thereby realizes heliciform metal wire one end is passed through first copper ring is fixed at the heat exchange tube entry, the heliciform metal wire other end passes through the second copper ring is fixed at the heat exchange tube export.
8. A process for preparing the heat exchange tube of claim 7, comprising the steps of:
s1: fixedly connecting one end of the spiral metal wire to an elastically deformable piston, and fixing the other end of the spiral metal wire on the inner wall of the first copper ring;
s2: one end of the elastic deformable piston, which is not connected with the spiral metal wire, is plugged into the heat exchange tube inlet of the heat exchanger, the heat exchange tube outlet is vacuumized, and the spiral metal wire and one end of the metal wire, which is fixedly connected with the elastic deformable piston, move together from the heat exchange tube inlet to the heat exchange tube outlet under the action of pressure difference.
9. A process for preparing a heat exchange tube according to claim 8, comprising the steps of:
s3: at the moment, one end of the spiral metal wire positioned at the outlet of the heat exchange tube is separated from the elastically deformable piston and then fixed on the inner wall of the second copper ring, and the spiral metal wire is fixed at the outlet of the heat exchange tube through the fixation of the second copper ring and the outlet of the heat exchange tube;
and the first copper ring is fixed with the heat exchange tube inlet of the heat exchanger, so that the other end of the spiral metal wire is fixed with the heat exchange tube inlet.
10. An air conditioner, comprising an evaporator and a condenser, wherein the evaporator and the condenser adopt the heat exchange tubes of claims 1-7, or the heat exchange tubes of the evaporator and the condenser are prepared by the process for preparing the heat exchange tubes of claims 8-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348861.8A CN111059954A (en) | 2019-12-24 | 2019-12-24 | Heat exchange tube, air conditioner and process method for preparing heat exchange tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911348861.8A CN111059954A (en) | 2019-12-24 | 2019-12-24 | Heat exchange tube, air conditioner and process method for preparing heat exchange tube |
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| CN2062817U (en) * | 1989-11-06 | 1990-09-26 | 孙力刚 | Heat exchanging pipe for tubular heat exchanger |
| EP0661511A1 (en) * | 1993-12-31 | 1995-07-05 | Hoechst Aktiengesellschaft | Heat exchanger tube with insert element |
| US5497824A (en) * | 1990-01-18 | 1996-03-12 | Rouf; Mohammad A. | Method of improved heat transfer |
| WO2001031275A1 (en) * | 1999-10-28 | 2001-05-03 | Mitsubishi Shindoh Co., Ltd. | Heat exchanger and heat exchanging apparatus |
| CN101257196A (en) * | 2008-03-04 | 2008-09-03 | 宁波建工集团有限公司 | Electric gas tube lead wire penetrating method |
| CN204678947U (en) * | 2015-02-12 | 2015-09-30 | 西安工程大学 | A kind of heat exchanger tube |
| CN206378035U (en) * | 2017-01-11 | 2017-08-04 | 哈尔滨耦合动力工程技术中心有限公司 | Finned heat exchanger with the spiral turbolator in inner chamber |
| CN109489457A (en) * | 2018-12-03 | 2019-03-19 | 森松（江苏）重工有限公司 | A kind of turbulent flow shell-and-tube heat exchanger |
| CN211953842U (en) * | 2019-12-24 | 2020-11-17 | 珠海格力电器股份有限公司 | Heat exchange tube and air conditioner |
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2019
- 2019-12-24 CN CN201911348861.8A patent/CN111059954A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2062817U (en) * | 1989-11-06 | 1990-09-26 | 孙力刚 | Heat exchanging pipe for tubular heat exchanger |
| US5497824A (en) * | 1990-01-18 | 1996-03-12 | Rouf; Mohammad A. | Method of improved heat transfer |
| EP0661511A1 (en) * | 1993-12-31 | 1995-07-05 | Hoechst Aktiengesellschaft | Heat exchanger tube with insert element |
| WO2001031275A1 (en) * | 1999-10-28 | 2001-05-03 | Mitsubishi Shindoh Co., Ltd. | Heat exchanger and heat exchanging apparatus |
| CN101257196A (en) * | 2008-03-04 | 2008-09-03 | 宁波建工集团有限公司 | Electric gas tube lead wire penetrating method |
| CN204678947U (en) * | 2015-02-12 | 2015-09-30 | 西安工程大学 | A kind of heat exchanger tube |
| CN206378035U (en) * | 2017-01-11 | 2017-08-04 | 哈尔滨耦合动力工程技术中心有限公司 | Finned heat exchanger with the spiral turbolator in inner chamber |
| CN109489457A (en) * | 2018-12-03 | 2019-03-19 | 森松（江苏）重工有限公司 | A kind of turbulent flow shell-and-tube heat exchanger |
| CN211953842U (en) * | 2019-12-24 | 2020-11-17 | 珠海格力电器股份有限公司 | Heat exchange tube and air conditioner |
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