Porous coating preparation device and method for outer wall of heat exchange pipeline of heat exchanger

Abstract

The invention discloses a porous coating preparation device and method for the outer wall of a heat exchange pipeline of a heat exchanger, and relates to the technical field of chemical deposition electroplating. A cathode wire of the electroplating mechanism is electrically connected with the heat exchange tube to be electroplated, and an anode wire is electrically connected with the anode block; and the electroplating pool is filled with electroplating liquid, and the to-be-electroplated heat exchange tube and the positive electrode block are arranged in the electroplating liquid. According to the method, the to-be-plated heat exchange tube is electroplated while being kept in a rotating state, so that the porous coating can avoid the gravity influence, a uniform and controllable porous structure is formed on the inner wall of the heat exchange tube, the thickness of the coating is uniform, and the pore size tends to be consistent.

Description

Technical Field

[0001] The invention relates to the technical field of chemical deposition electroplating, and in particular to a device and method for preparing a porous coating for the outer wall of a heat exchange pipe of a heat exchanger. Background Art

[0002] The inner wall of the heat exchange pipe of a traditional heat exchanger often has a large thermal resistance problem, which seriously affects the heat exchange efficiency. To solve the above problems, the existing technology sets a porous coating on the inner wall of the heat exchange pipe, and uses the high specific surface area and excellent thermal conductivity of the porous structure to effectively improve the heat exchange efficiency of the heat exchanger. However, the existing porous coating preparation technology often makes it difficult to set a uniform and controllable porous structure on the inner wall of the heat exchange pipe, and there are problems such as uneven coating thickness and inconsistent pore size.

[0003] In view of this, how to provide a uniform and controllable porous coating on the inner wall of the heat exchange tube is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for preparing a porous coating on the outer wall of a heat exchange pipe of a heat exchanger, so as to solve the problems existing in the prior art.

[0005] To achieve the above object, the present invention provides a device for preparing a porous coating on the outer wall of a heat exchange pipe of a heat exchanger, comprising:

[0006] A rotating power unit, used to drive the heat exchange tube to be plated to rotate along its axis;

[0007] An electroplating mechanism, wherein the negative electrode wire is electrically connected to the heat exchange tube to be plated, and the positive electrode wire is electrically connected to the positive electrode block;

[0008] The electroplating tank is filled with electroplating solution, and the heat exchange tube to be plated and the positive electrode block are arranged in the electroplating solution.

[0009] Furthermore, the rotary power unit comprises:

[0010] The driving pulley is driven to rotate by the driving motor;

[0011] The driven pulley is connected to the driving pulley through a transmission belt. A mounting hole is provided in the middle of the driven pulley through the inner and outer surfaces, and the heat exchange tube to be plated is arranged in the mounting hole.

[0012] Furthermore, it also includes:

[0013] A negative electrode panel, electrically connected to a negative electrode lead of an electroplating mechanism, wherein the negative electrode panel has a rotating friction surface;

[0014] A support beam, one end of which is connected to the rotating friction surface, and the other end of which extends in a direction away from the negative electrode panel. A bearing is provided at the other end of the support beam, and the outer diameter of the bearing is larger than the outer diameter of the support beam. The heat exchange tube to be plated is sleeved on the outside of the support beam, and one end of which is connected to the bearing, and the other end is connected to the rotating friction surface.

[0015] Furthermore, the electroplating mechanism comprises:

[0016] A power source has a positive plug electrically connected to the positive lead, and a negative plug electrically connected to the negative lead.

[0017] Furthermore, the electroplating solution is prepared with CuCl2 and HCl as solutes and deionized water as solvent. Cu2+ With C H+ The ratio is between 1:5 and 1:200.

[0018] The present invention also provides a method for preparing a porous coating for the outer wall of a heat exchange pipe of a heat exchanger, and using the porous coating preparation device for the outer wall of a heat exchange pipe of a heat exchanger comprises the following steps:

[0019] S1: Prepare the electroplating solution with CuCl2 and HCl as solute and deionized water as solvent. Cu2+ With C H+ The ratio is between 1:5 and 1:200, and the plating solution is filled into the plating tank;

[0020] S2: Install the heat exchange tube to be plated into the mounting hole of the driven pulley, with one end of the tube sleeved on the outside of the support beam and connected to the rotating friction surface of the negative panel, and the other end connected to the bearing on the support beam; connect the negative lead to the negative panel, connect the positive lead to the positive block, place the negative panel, the heat exchange tube to be plated and the positive block into the electroplating solution, electrically connect the positive plug of the power supply to the positive lead, and electrically connect the negative plug to the negative lead;

[0021] S3: starting the power supply and the driving motor, the driving motor drives the heat exchange tube to be plated to rotate, and electroplating forms a porous coating on the inner surface of the heat exchange tube to be plated;

[0022] S4: After the electroplating is completed, take out the heat exchange tube to be plated.

[0023] The present invention discloses the following technical effects:

[0024] 1. The present invention adopts a method of electroplating the heat exchange tube to be plated while maintaining a rotating state, so that the porous coating can avoid the influence of gravity and form a uniform and controllable porous structure on the inner wall of the heat exchange tube. The coating thickness is uniform and the pore size tends to be consistent.

[0025] 2. One end of the heat exchange tube to be plated is connected to the negative electrode panel, and the other end is connected to the bearing. While positioning the heat exchange tube to be plated, it does not affect the rotation of the heat exchange tube to be plated, thereby improving the stability of the electroplating process.

[0026] 3. The present invention has a compact structure and is easy to operate, and is suitable for the preparation of porous coatings on the inner walls of heat exchange pipes of different specifications and materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the assembly of the support beam and the heat exchange tube to be plated;

[0030] Figure 3 A schematic diagram of a porous structure formed on the inner wall of a heat exchange tube to be plated;

[0031] Among them, 1. negative electrode wire; 2. heat exchange tube to be plated; 3. positive electrode wire; 4. positive electrode block; 5. electroplating cell; 6. electroplating solution; 7. driving pulley; 8. driving motor; 9. driven pulley; 10. negative electrode panel; 11. support beam; 12. bearing; 13. power supply. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] An embodiment of the present invention provides a device for preparing a porous coating on the outer wall of a heat exchange pipe of a heat exchanger, comprising:

[0035] A rotating power unit, used to drive the heat exchange tube 2 to be plated to rotate along its axis;

[0036] The electroplating mechanism has a negative electrode wire 1 electrically connected to a heat exchange tube 2 to be plated to form a cathode unit, and a positive electrode wire 3 electrically connected to a positive electrode block 4 to form an anode unit;

[0037] The electroplating tank 5 is filled with an electroplating solution 6 , and the heat exchange tube 2 to be plated and the positive electrode block 4 are arranged in the electroplating solution 6 .

[0038] In this embodiment, the heat exchange tubes are metal tubes not covered with insulating materials, and the anode blocks are metal blocks.

[0039] In this embodiment, the rotary power unit includes:

[0040] The driving pulley 7 is driven to rotate by the driving motor 8;

[0041] The driven pulley 9 is connected to the driving pulley 7 through a transmission belt. A mounting hole is provided in the middle of the driven pulley 9 through the inner and outer surfaces, and the heat exchange tube 2 to be plated is provided in the mounting hole.

[0042] In this embodiment, it also includes:

[0043] A negative electrode panel 10 is electrically connected to a negative electrode lead 1 of an electroplating mechanism, and the negative electrode panel 10 has a rotating friction surface;

[0044] The support beam 11 has one end connected to the rotating friction surface and the other end extending in the direction away from the negative electrode panel 10. A bearing 12 is provided at the other end of the support beam 11. The outer diameter of the bearing 12 is larger than the outer diameter of the support beam 11. The heat exchange tube 2 to be plated is sleeved on the outside of the support beam 11, and one end of it is connected to the bearing 12 and the other end is connected to the rotating friction surface.

[0045] In this embodiment, the electroplating mechanism includes:

[0046] The power source 13 has a positive plug electrically connected to the positive lead 3 , and a negative plug electrically connected to the negative lead 1 .

[0047] In this embodiment, the electroplating solution 6 is prepared with CuCl2 and HCl as solutes and deionized water as solvent. Cu2+ With C H+ The ratio is between 1:5 and 1:200.

[0048] In this embodiment, each unit can be manually adjusted or intelligently controlled to facilitate high-precision control of the electroplating process.

[0049] The embodiment of the present invention further provides a method for preparing a porous coating for the outer wall of a heat exchange pipe of a heat exchanger, and the method uses the above-mentioned device for preparing a porous coating for the outer wall of a heat exchange pipe of a heat exchanger, comprising the following steps:

[0050] S1: Prepare electroplating solution 6 with CuCl2 and HCl as solute and deionized water as solvent.Cu2+ With C H+ The ratio is between 1:10, and the electroplating solution 6 is filled into the electroplating tank 5;

[0051] S2: Install the heat exchange tube 2 to be plated into the mounting hole of the driven pulley 9, one end of which is sleeved on the outer side of the support beam 11 and connected to the rotating friction surface of the negative panel 10, and the other end is connected to the bearing 12 on the support beam 11; connect the negative lead 1 to the negative panel 10, connect the positive lead 3 to the positive block 4, place the negative panel 10, the heat exchange tube 2 to be plated and the positive block 4 into the electroplating solution 6, electrically connect the positive plug of the power supply 13 to the positive wire 3, and electrically connect the negative plug to the negative wire 1;

[0052] S3: Start the power supply 13 and the drive motor 8. The power supply 13 is a DC power supply 13 with an output current of 3A. The drive motor 8 drives the heat exchange tube 2 to be plated to rotate at a speed of 30 rad / min. A porous coating is electroplated on the inner surface of the heat exchange tube 2 to be plated. The electroplating time is 5 minutes.

[0053] S4: After the electroplating is completed, the heat exchange tube 2 to be plated is taken out;

[0054] S5: Place the heat exchange tube in an atmosphere furnace, introduce nitrogen or other inert gas, or perform high-temperature sintering and curing treatment on the heat exchange tube under vacuum conditions.

[0055] like Figure 3 As shown in the figure, after the electroplating is completed and the high-temperature sintering and curing treatment is carried out, a uniform porous structure is formed on the inner wall of the heat exchange tube. Samples are uniformly taken along the length of the inner wall of the heat exchange tube, with a total of 178 sampling points. The pore sizes of the sampling points are recorded, and the results are as follows:

[0056] Sampling point Diameter(mm) Sampling point Diameter(mm) Sampling point Diameter(mm) Sampling point Diameter(mm) 1 0.024 51 0.032 101 0.024 151 0.023 2 0.029 52 0.035 102 0.028 152 0.036 3 0.03 53 0.051 103 0.052 153 0.024 4 0.029 54 0.038 104 0.038 154 0.023 5 0.023 55 0.021 105 0.046 155 0.023 6 0.032 56 0.028 106 0.032 156 0.029 7 0.019 57 0.024 107 0.059 157 0.021 8 0.026 58 0.017 108 0.048 158 0.038 9 0.032 59 0.023 109 0.033 159 0.026 10 0.027 60 0.023 110 0.028 160 0.024 11 0.029 61 0.035 111 0.039 161 0.03 12 0.021 62 0.032 112 0.031 162 0.04 13 0.021 63 0.03 113 0.022 163 0.034 14 0.022 64 0.026 114 0.026 164 0.036 15 0.023 65 0.016 115 0.022 165 0.026 16 0.053 66 0.034 116 0.033 166 0.025 17 0.028 67 0.021 117 0.035 167 0.047 18 0.036 68 0.031 118 0.026 168 0.043 19 0.031 69 0.023 119 0.029 169 0.046 20 0.04 70 0.02 120 0.027 170 0.03 21 0.026 71 0.025 121 0.021 171 0.026 22 0.023 72 0.028 122 0.041 172 0.027 23 0.034 73 0.044 123 0.032 173 0.024 24 0.038 74 0.03 124 0.024 174 0.035 25 0.02 75 0.03 125 0.025 175 0.051 26 0.034 76 0.023 126 0.023 176 0.038 27 0.032 77 0.031 127 0.032 177 0.033 28 0.028 78 0.035 128 0.03 178 0.037 29 0.032 79 0.032 129 0.035 average value 0.029713 30 0.017 80 0.025 130 0.038 31 0.024 81 0.026 131 0.044 32 0.029 82 0.024 132 0.034 33 0.028 83 0.028 133 0.027 34 0.032 84 0.023 134 0.024 35 0.025 85 0.026 135 0.032 36 0.046 86 0.021 136 0.023 37 0.029 87 0.027 137 0.023 38 0.03 88 0.028 138 0.02 39 0.021 89 0.021 139 0.035 40 0.039 90 0.027 140 0.02 41 0.018 91 0.033 141 0.023 42 0.033 92 0.023 142 0.027 43 0.029 93 0.044 143 0.024 44 0.031 94 0.026 144 0.026 45 0.023 95 0.041 145 0.014 46 0.027 96 0.032 146 0.025 47 0.021 97 0.032 147 0.021 48 0.016 98 0.035 148 0.031 49 0.03 99 0.034 149 0.025 50 0.052 100 0.033 150 0.028

[0057] It can be seen from the above table that the pore sizes of the porous structure formed on the inner wall of the heat exchange tube tend to be consistent, proving that the method disclosed in this embodiment can form a porous coating with uniform pore size.

[0058] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A porous coating preparation device for the outer wall of a heat exchange pipe of a heat exchanger, characterized in that: include: A rotating power unit, used to drive the heat exchange tube (2) to be plated to rotate along its axis; An electroplating mechanism, wherein the negative electrode wire (1) is electrically connected to the heat exchange tube (2) to be plated, and the positive electrode wire (3) is electrically connected to the positive electrode block (4); The electroplating pool (5) is filled with an electroplating solution (6), and the heat exchange tube (2) to be plated and the positive electrode block (4) are arranged in the electroplating solution (6).

2. The porous coating preparation device for the outer wall of the heat exchange pipe of a heat exchanger according to claim 1, characterized in that: The rotary power unit comprises: A driving pulley (7) is driven to rotate by a driving motor (8); The driven pulley (9) is connected to the driving pulley (7) via a transmission belt, and a mounting hole is provided in the middle of the driven pulley (9) through the inner and outer surfaces, and the heat exchange tube (2) to be plated is arranged in the mounting hole.

3. The porous coating preparation device for the outer wall of the heat exchange pipe of a heat exchanger according to claim 2, characterized in that: Also includes: A negative electrode panel (10) is electrically connected to a negative electrode lead (1) of an electroplating mechanism, wherein the negative electrode panel (10) has a rotating friction surface; A support beam (11) has one end connected to the rotating friction surface and the other end extending in a direction away from the negative electrode panel (10); a bearing (12) is provided at the other end of the support beam (11); the outer diameter of the bearing (12) is larger than the outer diameter of the support beam (11); the heat exchange tube (2) to be plated is sleeved on the outer side of the support beam (11), and one end of the heat exchange tube (2) is connected to the bearing (12) and the other end is connected to the rotating friction surface.

4. The porous coating preparation device for the outer wall of the heat exchange pipe of a heat exchanger according to claim 3, characterized in that: The electroplating mechanism comprises: A power source (13) has a positive plug electrically connected to the positive lead (3), and a negative plug electrically connected to the negative lead (1).

5. The device for preparing a porous coating on the outer wall of a heat exchange pipe of a heat exchanger according to claim 4, characterized in that: The electroplating solution (6) is prepared with CuCl2 and HCl as solutes and deionized water as solvent. Cu2+ With C H+ The ratio is between 1:5 and 1:

200.

6. A method for preparing a porous coating for the outer wall of a heat exchange pipe of a heat exchanger, characterized in that: Using the porous coating preparation device for the outer wall of the heat exchange pipe of the heat exchanger as described in claim 5, The following steps are involved: S1: Prepare the electroplating solution (6) with CuCl2 and HCl as solute and deionized water as solvent. Cu2+ With C H+ The ratio is between 1:5 and 1:200, and the electroplating solution (6) is filled into the electroplating tank (5); S2: The heat exchange tube to be plated (2) is installed in the installation hole of the driven pulley (9), one end of which is sleeved on the outer side of the support beam (11) and connected to the rotating friction surface of the negative electrode panel (10), and the other end is connected to the bearing (12) on the support beam (11); the negative electrode wire (1) is connected to the negative electrode panel (10), the positive electrode wire (3) is connected to the positive electrode block (4), the negative electrode panel (10), the heat exchange tube to be plated (2) and the positive electrode block (4) are placed in the electroplating solution (6), the positive electrode plug of the power supply (13) is electrically connected to the positive electrode wire (3), and the negative electrode plug is electrically connected to the negative electrode wire (1); S3: starting the power supply (13) and the driving motor (8), so that the driving motor (8) drives the heat exchange tube (2) to be plated to rotate, and electroplating forms a porous coating on the inner surface of the heat exchange tube (2) to be plated; S4: After the electroplating is completed, the heat exchange tube (2) to be plated is taken out.

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