Anti-corrosion air conditioner heat exchanger

Abstract

The utility model discloses an anti-corrosion air-conditioning heat exchanger, which relates to the technical field of air-conditioning equipment and comprises a heat exchanger arranged in an air-conditioning outdoor unit, the heat exchanger is provided with a heat exchange tube, the heat exchange tube is connected with heat exchange fins in series, the heat exchange fins are corrugated and are provided with concave surfaces and convex surfaces, the concave surfaces of the heat exchange fins are provided with a plurality of ribs at intervals, and the convex surfaces of the heat exchange fins are provided with convex surfaces. The protruding edges extend in the length direction of the heat exchange fins, and a flow guide channel allowing liquid to pass through is formed between every two adjacent protruding edges. A plurality of through holes for the heat exchange tubes to pass through are formed in the heat exchange fins at intervals; on one hand, by improving the structure of the heat exchange fins on the heat exchanger, the ventilation and drainage performance of the heat exchanger is better, the adhesion of rainwater, dust or condensate water is reduced, the corrosion speed of a high-temperature humid environment to the heat exchanger is reduced, and meanwhile the heat exchange effect of the heat exchanger is improved; and on the other hand, the surface of the heat exchanger is covered with the composite nanometer oxidation film, the corrosion resistance of the heat exchanger can be enhanced, and the service life of the heat exchanger is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning equipment, in particular to an anti-corrosion air conditioning heat exchanger. Background Art

[0002] With the increasingly serious environmental pollution, rain and snow will be mixed with a lot of corrosive substances. The outdoor unit of the air conditioner is exposed to the outdoor environment for a long time. When encountering rainy and snowy weather, the rain and snow mixed with corrosive substances will fall on the outdoor unit of the air conditioner, causing corrosion to the metal shell, copper-aluminum condenser and electrical control components of the outdoor unit of the air conditioner, affecting its service life and use effect; among them, the corrosion of the heat exchanger mainly made of aluminum and copper materials is the most serious. After observation, in areas with serious environmental pollution, high humidity and a lot of rain, the surface of the heat exchanger of some outdoor units of air conditioners has poor drainage, resulting in the surface of the heat exchanger being attached with rainwater, condensate, dust, or a mixture thereof for a long time. Within a few years, the heat exchange fins on the heat exchanger are corroded into powder. After the heat exchange fins are corroded, the exposed heat exchange tubes will start to corrode in a high-temperature, high-humidity and high-salt environment. A large amount of corrosive substances adhere to the outside of the heat exchange tubes, seriously hindering heat exchange and greatly reducing the refrigeration capacity of the air conditioner.

[0003] At present, in order to slow down the corrosion speed of the heat exchanger, extend its service life and ensure its heat exchange effect, the traditional heat exchange fins are coated with an anti-corrosion coating on the heat exchange fins and then a layer of hydrophilic aluminum foil is made. When the corrosion environment grade is C3 and below, it can resist environmental corrosion; however, in the high-temperature, high-humidity and high-corrosion environment of tropical islands, coupled with frequent heavy rain, the surface of the heat exchanger is attached with rainwater or condensate for a long time and cannot be drained away in time, resulting in the original anti-corrosion layer and hydrophilic layer of the heat exchange fins being unable to resist the corrosion of the external environment; moreover, during the process of cutting and stamping the heat exchange fins of the conventional air conditioner heat exchanger into fins, the cutting edges of the heat exchange fins are in an exposed state. When the air conditioner is in a high-temperature, high-humidity and high-salt high-corrosion environment, the exposed cutting edges start to corrode from the edges. After the hydrophilic layer and the pre-coated anti-corrosion coating on the surface of the heat exchange fins are corroded, the base material of the heat exchange fins also starts to corrode. At the same time, there is a potential difference between the heat exchange fins made of aluminum material and the heat exchange tubes made of copper material. In a high-temperature, high-humidity and high-salt environment, it will accelerate the corrosion of the heat exchange fins. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an anti-corrosion air conditioning heat exchanger. On the one hand, by improving the structure of the heat exchange fins on the heat exchanger, its ventilation and drainage performance is better, reducing the attachment of rainwater, dust or condensate, reducing the corrosion speed of the heat exchanger in a high-temperature and humid environment, and at the same time increasing its heat exchange effect; on the other hand, a layer of composite nano-oxide film is covered on the surface of the heat exchanger, which can enhance its anti-corrosion performance and extend its service life.

[0005] The utility model includes a heat exchanger installed inside an air conditioner outdoor unit. The heat exchanger is provided with heat exchange tubes, and heat exchange fins are connected in series on the heat exchange tubes. The heat exchange fins are in a corrugated shape with a concave surface and a convex surface. A number of convex ribs are arranged at intervals on the concave surface of the heat exchange fins. The convex ribs extend along the length direction of the heat exchange fins. A diversion channel for liquid to pass through is formed between two adjacent convex ribs; a number of through holes for the heat exchange tubes to pass through are arranged at intervals on the heat exchange fins.

[0006] Preferably, the cross-section of the heat exchange fin is in a shape of three circular arcs connected end to end. The diameter of the middle circular arc is larger than that of the circular arcs on the left and right sides, and the center of the middle circular arc and the centers of the circular arcs on the left and right sides are on different sides.

[0007] Preferably, the heat exchange fin is turned over towards the convex surface at the through hole to form an annular flange.

[0008] Preferably, the flange is in a shape of a frustum of a cone with an outer diameter decreasing in sequence from the through hole.

[0009] Preferably, the height of the flange is between 1.3 and 1.5 millimeters.

[0010] Preferably, the heat exchange fin is made of aluminum material.

[0011] Preferably, the heat exchange tube is made of copper material.

[0012] Preferably, the outer surfaces of the heat exchange tube and the heat exchange fin are covered with a layer of composite nano-oxide film.

[0013] In summary, the utility model has the following beneficial effects:

[0014] 1. The heat exchange fins of the heat exchanger are in a corrugated shape with a concave surface and a convex surface. A number of convex ribs are arranged at intervals on the concave surface of the heat exchange fins. A diversion channel for liquid to pass through is formed between two adjacent convex ribs. The diversion channel is a straight channel arranged vertically, which facilitates the liquid-like rainwater to flow vertically downward in a straight line, enabling the rainwater to flow out quickly along the diversion channel and preventing the rainwater from spreading on the heat exchange fins, thus avoiding the increase in travel length and the decrease in flow velocity;

[0015] 2. The cross-section of the heat exchange fin is in a shape of three circular arcs connected end to end, which makes the heat dissipation area of the heat exchange fin larger;

[0016] 3. The heat exchange fin is turned over at the through hole for connecting the heat exchange tube to form an annular flange. The height of the flange is between 1.3 and 1.5 millimeters, that is, the distance between two heat dissipation fins. The flange is used to control the distance between the heat dissipation fins, making the installation more convenient and the dimension control more accurate. At the same time, the flange of one heat dissipation fin abuts against the convex rib of another heat dissipation fin, and a gap for rainwater to pass through is left between the flange and the convex rib, avoiding the direct contact between the flange and the surface of the heat exchange fin and facilitating heat dissipation at the same time;

[0017] 4. A composite nano-oxide film is coated on the surface of the heat exchanger, which has the property of salt spray corrosion resistance, can enhance the anti-corrosion performance of the heat exchanger, extend its service life, and without changing the structure of the original heat exchanger, only need to immerse the heat exchanger after being finally formed by all processing techniques such as welding and bending in a solution mixed with components such as titanium and trivalent chromium, and finally take out the heat exchanger and let it dry naturally, with simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an anti-corrosion air-conditioning heat exchanger of the present utility model;

[0019] Figure 2 It is a schematic diagram of the concave surface structure of the heat exchange fin;

[0020] Figure 3 It is a schematic diagram of the convex surface structure of the heat exchange fin;

[0021] Figure 4 It is a schematic diagram of the side structure of the heat exchange fin.

[0022] In the figure: 1, heat exchanger; 2, heat exchange tube; 3, heat exchange fin; 4, concave surface; 5, convex surface; 6, convex rib; 7, through hole; 8, flanging. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present utility model will be further described below with reference to the accompanying drawings.

[0024] The orientations involved in this specification are based on the orientation when an anti-corrosion air-conditioning heat exchanger of the present utility model is working properly, without limiting its orientation during storage and transportation, only representing the relative positional relationship, not the absolute positional relationship.

[0025] As Figures 1 to 4 As commonly shown, an anti-corrosion air-conditioning heat exchanger includes a heat exchanger 1 installed in an air-conditioning outdoor unit. The heat exchanger 1 is provided with heat exchange tubes 2, and heat exchange fins 3 are connected in series on the heat exchange tubes 2. The heat exchange fins 3 are in a corrugated shape with a concave surface 4 and a convex surface 5. A number of convex ribs 6 are arranged at intervals on the concave surface 4 of the heat exchange fins 3. The convex ribs 6 extend along the length direction of the heat exchange fins 3. A number of convex ribs 6 are arranged in parallel with the same spacing. A diversion channel for liquid to pass through is formed between two adjacent convex ribs 6. The diversion channel is a straight channel arranged in the vertical direction, which is convenient for liquid rainwater to flow vertically downward in a straight line, so that the rainwater can quickly flow out along the diversion channel, avoiding the rainwater from spreading on the heat exchange fins 3, thereby making the travel distance longer and the flow rate slower.

[0026] The cross-section of the heat exchange fin 3 is in the shape of three circular arcs connected end to end. The diameter of the middle circular arc is larger than that of the left and right circular arcs, and the centers of the middle circular arc and the left and right circular arcs are on different sides, thus forming the concave surface 4 and the convex surface 5 of the heat exchange fin 3. The cross-section of the entire heat exchange fin 3 is in a gently undulating shape, making the heat dissipation area of the heat exchange fin 3 larger.

[0027] A number of through holes 7 for the heat exchange tubes 2 to pass through are provided at intervals on the heat exchange fin 3. The heat exchange fin 3 is folded towards the convex surface 5 at the through holes 7 to form a circular flanging 8. The flanging 8 is in the shape of a frustum of a cone with the outer diameter decreasing in sequence from the through hole 7. The frustum-shaped flanging 8 forms a gentle transition between the heat dissipation fin and the heat exchange tube 2, avoiding the formation of a 90-degree angle at the connection between the heat exchange fin 3 and the heat exchange tube 2, which would form a ventilation dead corner, easily accumulate dust and rainwater, and accelerate the corrosion of the components at this place; the flanging 8 is sleeved outside the heat exchange tube 2, increasing the contact area between the heat exchange fin 3 and the heat exchange tube 2, making the connection more firm; the height of the flanging 8 is between 1.3 - 1.5 millimeters, which is also the distance between two heat dissipation fins. Keeping a certain distance between two heat dissipation fins is more conducive to heat dissipation. By controlling the height of the flanging 8, the distance between the heat dissipation fins is controlled, making the installation more convenient and the size control more precise. At the same time, the flanging 8 of one heat dissipation fin abuts against the convex rib 6 of another heat dissipation fin, and there is a gap for rainwater to pass through between the flanging 8 and the convex rib 6, avoiding the direct contact between the flanging 8 and the surface of the heat exchange fin 3 and also facilitating heat dissipation.

[0028] The heat exchange fin 3 is made of aluminum material, and the heat exchange tube 2 is made of copper material; a composite nano-oxide film is covered on the outer surfaces of the heat exchange tube 2 and the heat exchange fin 3. The main components of the composite nano-oxide film include AL(OH)3, Ti(OH)4, Cr(OH)3, etc., and it has the characteristic of salt spray corrosion resistance; after the heat exchanger 1 is finally formed through all processing techniques such as welding and bending, the entire heat exchanger 1 is immersed in a solution mixed with components such as titanium and trivalent chromium. After all surfaces of the heat exchange fin 3 and the heat exchange tube 2 are in full contact with the solution, a composite nano-oxide film as described above is formed on the surfaces of the heat exchange tube 2 and the heat exchange fin 3. Finally, the heat exchanger 1 is taken out and dried naturally; at the same time, in addition to the surface of the heat exchange fin 3, all cutting surfaces of the heat exchange fin 3 are also covered with the composite nano-oxide film, which can completely separate the heat exchange fin 3 from the outside world, avoid being corroded by the external adverse environment, and also form a barrier between the heat exchange fin 3 made of aluminum material and the heat exchange tube 2 made of copper material, avoiding the electrochemical corrosion effect caused by the direct contact between copper and aluminum; in this way, a protective layer is attached to the entire outer surface of the heat exchanger 1, greatly improving the corrosion resistance of the heat exchanger 1.

[0029] Certainly, the above description is not a limitation to the present utility model, nor is the present utility model limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the essence of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. An anti-corrosion air conditioner heat exchanger, comprising a heat exchanger (1) installed in an air conditioner outdoor unit, the heat exchanger (1) being provided with heat exchange tubes (2), and heat exchange fins (3) being connected in series on the heat exchange tubes (2), characterized in that: The heat exchange fin (3) has a corrugated shape with a concave surface (4) and a convex surface (5). A plurality of convex ribs (6) are provided at intervals on the concave surface (4) of the heat exchange fin (3). The convex ribs (6) extend along the length direction of the heat exchange fin (3), and a diversion channel for liquid to pass through is formed between two adjacent convex ribs (6). A plurality of through holes (7) for the heat exchange tubes (2) to pass through are provided at intervals on the heat exchange fin (3).

2. The anti-corrosion air conditioner heat exchanger according to claim 1, wherein: The cross-section of the heat exchange fin (3) is a circular arc shape formed by connecting three sections end to end. The diameter of the middle circular arc is larger than that of the circular arcs on the left and right sides, and the centers of the middle circular arc and the circular arcs on the left and right sides are on different sides.

3. The anti-corrosion air conditioner heat exchanger according to claim 1, wherein: The heat exchange fin (3) is turned over towards the convex surface (5) at the through hole (7) to form an annular flange (8).

4. The anti-corrosion air conditioner heat exchanger according to claim 3, wherein: The flange (8) is in the shape of a frustum of a cone with an outer diameter decreasing in sequence from the through hole (7).

5. The anti-corrosion air conditioner heat exchanger according to claim 3, wherein: The height of the flange (8) is between 1.3 and 1.5 millimeters.

6. The anti-corrosion air conditioner heat exchanger according to claim 1, wherein: The heat exchange fin (3) is made of aluminum material.

7. An anti-corrosion air conditioner heat exchanger according to claim 1, characterized in that: The heat exchange tube (2) is made of copper material.

8. The anti-corrosion air conditioner heat exchanger according to claim 1, wherein: The outer surfaces of the heat exchange tube (2) and the heat exchange fin (3) are covered with a layer of composite nano-oxide film.

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