A high efficiency evaporator

Abstract

The present invention discloses a high-efficiency evaporator, including a heat pipe, a fin tube, and a protective sheet. The fin tube is in a circular ring shape, the heat pipe is arranged in the fin tube, the fin tube is composed of a plurality of fins arranged adjacent to each other, the cross section of the fin is in a stepped shape, the fins are arranged adjacent to each other in a horizontal manner, and the left and right sides of the bottom end of the fin are respectively welded to the fins on the adjacent two sides, the bottom surface of the wing is welded and fixed to the heat pipe, the protective sheet is located at the upper end of the fin and the protective sheet is arranged horizontally, and the two ends of the protective sheet are respectively welded and fixed to the top ends of the two adjacent fins. The present invention further enhances the sealing of the fin tube by arranging the protective sheet on the fin, and prevents and slows down the corrosion of the heat pipe caused by the damage of the fin tube.

Description

Technical Field

[0001] The invention relates to the field of refrigeration equipment, and in particular to a high-efficiency evaporator. Background Art

[0002] The evaporator is a very important component among the four major parts of refrigeration. The low-temperature condensed liquid passes through the evaporator to exchange heat with the outside air, vaporize and absorb heat to achieve the refrigeration effect. The evaporator is mainly composed of two parts: the heating chamber and the evaporation chamber. The heating chamber provides the heat required for evaporation to the liquid, causing the liquid to boil and vaporize, and the evaporation chamber completely separates the gas and liquid phases.

[0003] Due to its excellent performance, the evaporator is widely used in the chemical industry, food industry, pharmaceutical industry and other industries. The evaporator also plays an important role in the process of air conditioning refrigeration. During the use of the air conditioning evaporator, SO2, CL2, H2S and other substances in the air pass through the gaps between the evaporator fin tubes and dissolve in the gap condensation water to form corrosive ions, and the organic solvents and volatile oils remaining on the surface of the copper tube are hydrolyzed to produce carboxylic acids, which form self-corrosion micro-batteries on the surface of the copper tube, causing corrosion damage.

[0004] The existing evaporator seals the fin tube by welding between the blades that form the fin tube to prevent corrosion of the copper tube. However, since the blades and the copper tube need to be welded, when the copper tube expands and contracts due to heat and cold, the stress of the copper tube will damage the fin, resulting in gaps between the connections of the fins. The copper tube in the gap is often corroded, which will further affect the use of the evaporator and make it difficult for the evaporator to work efficiently. Summary of the invention

[0005] The purpose of the present invention is to provide a high-efficiency evaporator, which solves the problem that the copper tube of the evaporator is corroded due to gaps between the wings, making it difficult for the evaporator to operate efficiently.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A high-efficiency evaporator, characterized in that it includes a heat pipe, a fin tube, and a protective sheet. The fin tube is in a circular ring shape, the heat pipe is inserted into the fin tube, the fin tube is composed of a plurality of adjacently arranged wing blades, the cross-section of the wing blade is stepped, the wing blades are adjacent to each other and horizontally arranged, and the left and right sides of the bottom end of the wing blade are respectively welded to the adjacent wing blades on both sides, the bottom surface of the wing blade is welded and fixed to the heat pipe, the protective sheet is located at the upper end of the fin and the protective sheet is horizontally arranged, and the two ends of the protective sheet are respectively welded and fixed to the top ends of the two adjacent wing blades.

[0008] By adopting the above technical solution, a layer of protective sheet is further reinforced at the outer end of the wing. When a gap appears at the connection of the wing due to thermal expansion and contraction of the heat pipe, a layer of sealing can be added to the outside of the wing through the protective sheet. Therefore, when the connection between the inside of the wing and the copper tube is damaged and a gap appears, the external protective sheet can still provide a sealed environment for the copper tube to prevent the copper tube from being exposed to the air and corroded, thereby maintaining the efficient operation of the evaporator by maintaining the characteristics of the copper tube.

[0009] Preferably, the protection sheet is in the shape of a hollow circular tube, and the two ends of the protection sheet are in a folded tooth shape.

[0010] By adopting the above technical solution, the protective sheet is set to a folded tooth shape, so that when the protective sheet is affected by external impact or wing shape change, the impact can be offset by the deformation of the folded teeth, thereby avoiding damage to the protective sheet.

[0011] Preferably, the protective sheet is an aluminum foil protective sheet.

[0012] With the above technical solution, aluminum foil is a hot stamping material that is directly rolled into a thin sheet using metal aluminum. Aluminum foil has good ductility and thermal conductivity. Therefore, the protective sheet is made of aluminum foil material, which not only avoids the poor heat dissipation effect of the evaporator due to the sealing of the protective sheet, but also avoids the protection sheet being damaged and gapped when it is impacted, thereby affecting its protective effect.

[0013] Preferably, the heat pipe is a copper-nickel alloy tube.

[0014] By adopting the above technical scheme, copper and nickel can be infinitely dissolved in each other to form a continuous solid solution. Therefore, the copper-nickel alloy tube can be mixed freely in proportion. Pure copper plus nickel can significantly improve the strength, corrosion resistance and hardness, thus preventing and slowing down the corrosion of the heat pipe.

[0015] Preferably, the content of each component of the heat pipe is nickel + cobalt: 10.0, tin Sn: ≤0.03, zinc Zn: ≤0.3, lead Pb: ≤0.02, phosphorus P: ≤0.006, iron Fe: 1.0-1.5, manganese Mn: 0.5-1.0; silicon Si: ≤0.15, sulfur S: ≤0.01, carbon C: ≤0.05, impurities: ≤0.5, and the balance is copper.

[0016] By adopting the above technical solution, the heat pipe with this ratio has deep drawing performance in terms of corrosion resistance, so that when the wings are damaged and broken to produce gaps, the heat pipe itself can resist and reduce corrosion, thereby preventing the heat pipe from being corroded and causing the evaporator efficiency to decrease or even become difficult to operate.

[0017] Preferably, the heat pipe is a U-shaped pipe, and a U-shaped connector is welded and fixed to one end of the heat pipe away from the U-shaped head.

[0018] By adopting the above technical solution, a U-shaped connector is welded to the other end of the U-shaped head of the heat pipe, so that both ends of the heat pipe are arc-shaped, thereby avoiding scratching people or other objects during transportation or movement.

[0019] Preferably, the surface of the heat pipe is coated with a corrosion inhibitor layer.

[0020] By adopting the above technical solution, by coating the corrosion inhibitor on the surface of the heat pipe, the corrosion rate of the heat pipe can be reduced, so that the heat pipe can protect itself when the main fins are damaged and gaps are generated.

[0021] Preferably, the corrosion inhibitor layer is an oil-soluble BTA layer.

[0022] By adopting the above technical solution, the oil-soluble BTA layer is a benzotriazole layer, which is dissolved in volatile oil and coated on the surface of the heat pipe. After drying, it can be stably adhered and has a corrosion-inhibiting effect by inhibiting the anode reaction in the corrosion structure, thereby slowing down the corrosion rate of the heat pipe.

[0023] Preferably, an end plate is further included, and a base is fixedly connected to the bottom of the end plate.

[0024] By adopting the above technical solution, the contact area between the end plate and the ground is increased by connecting the base at the bottom of the end plate, so that the evaporator can work more stably.

[0025] Preferably, baffles are fixedly connected to both sides of the end plate.

[0026] By adopting the above technical solution, by connecting baffles on both sides of the end plate, a certain protection effect can be provided to the connection between the end plate and the heat pipe, preventing the connection between the heat pipe and the end plate from being loosened due to impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an embodiment;

[0028] Figure 2 The embodiment is used to show the structural schematic diagram of the fin tube;

[0029] Figure 3 A schematic diagram of the position of the protective sheet used in the embodiment;

[0030] Figure 4 The embodiment is a schematic diagram for showing the position of the corrosion inhibitor layer.

[0031] Figure numerals: 1. end plate; 2. baffle; 3. base; 4. heat pipe; 5. U-shaped connector; 6. fin tube; 7. wing blade; 8. protective sheet; 9. corrosion inhibitor layer. DETAILED DESCRIPTION

[0032] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. At the same time, it should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

[0033] See Figures 1 to 4 A high-efficiency evaporator includes a heat pipe 4, a finned tube 6, and a protective sheet 8. The finned tube 6 is annular. The heat pipe 4 is inserted into the finned tube 6 to attach Figure 2 As shown, the fin tube 6 is composed of a plurality of wing blades 7 arranged adjacent to each other, the cross-section of the wing blade 7 is stepped, the wing blades 7 are arranged horizontally adjacent to each other, and the left and right sides of the bottom end of the wing blade 7 are respectively welded to the wing blades 7 on the adjacent two sides, the bottom surface of the wing blade 7 is welded and fixed to the heat pipe 4, the protective sheet 8 is located at the upper end of the fin and the protective sheet 8 is arranged horizontally, the two ends of the protective sheet 8 are respectively welded and fixed to the top ends of the two adjacent wing blades 7, and the protective sheet 8 is in the shape of a hollow circular tube.

[0034] Attach Figure 3 As shown, the two ends of the protective sheet 8 are in a folded tooth shape. The protective sheet 8 is an aluminum foil protective sheet 8. The aluminum foil is a hot stamping material that is directly rolled into a thin sheet using metal aluminum. The aluminum foil has good ductility and thermal conductivity. Therefore, the protective sheet 8 is made of aluminum foil material, which not only avoids the poor heat dissipation effect of the evaporator due to the sealing of the protective sheet 8, but also avoids the protection sheet 8 being damaged and having gaps when it is impacted, thereby affecting its protective effect.

[0035] During the use of air conditioners, it is often necessary to use cleaning agents to remove oil and grease from parts or components. Cleaning agents often use chlorinated organic solvents. The hydrolysis products of chlorinated organic solvents can cause formic corrosion, such as 1.1.1-trichloroethane. In addition, the volatile lubricating oil used in bending, expanding and fin stamping will produce formic acid and acetic acid after hydrolysis, which will corrode copper tubes. The insulation layer of today's air conditioners is a plastic foam insulation layer, and polyethylene plastic foam will also produce formic acid and acetic acid when it is exposed to high-temperature water for a long time.

[0036] During the use of the air conditioner, in addition to the corrosion caused by the above three reasons, corrosive gas impurities or particles in the air conditioner's use environment will also enter the air conditioner evaporator through the air, causing corrosion of the copper tube. The corrosive gas in the air is generally isolated from the outside of the heat pipe 4 by the blades 7. However, when the heat pipe 4 is deformed due to thermal expansion and contraction, it often produces corresponding stress on the blades 7 welded to it, thereby causing gaps in the sealed connection of the blades 7, making it easy for air to enter and cause corrosion to the heat pipe 4.

[0037] Therefore, a layer of protective sheet 8 is further reinforced at the outer end of the wing 7. When a gap appears at the connection of the wing 7 due to thermal expansion and contraction of the heat pipe 4, a layer of sealing can be added to the outside of the wing 7 through the protective sheet 8. Therefore, when the connection between the inside of the wing 7 and the copper tube is damaged and a gap appears, the external protective sheet 8 can still provide a sealed environment for the copper tube to prevent the copper tube from being exposed to the air and corroded, thereby maintaining the efficient operation of the evaporator by maintaining the characteristics of the copper tube.

[0038] Furthermore, the protection sheet 8 is configured to be in a folded tooth shape, so that when the protection sheet 8 is affected by an external impact or a change in the shape of the wing blade 7, the impact can be offset by the deformation of the folded tooth shape, thereby avoiding damage to the protection sheet 8.

[0039] The protective sheet 8 is made of aluminum foil and has a folded tooth shape, so that the protective sheet 8 provides a second layer of sealing protection for the wing blades 7 and the heat pipe 4 in addition to the wing blades 7. In addition to preventing the heat pipe 4 from being corroded, it also avoids isolating heat transfer, allowing the evaporator to operate efficiently.

[0040] The heat pipe 4 is a copper-nickel alloy tube, and the contents of the components of the heat pipe 4 are nickel + cobalt: 10.0, tin Sn: ≤0.03, zinc Zn: ≤0.3, lead Pb: ≤0.02, phosphorus P: ≤0.006, iron Fe: 1.0-1.5, manganese Mn: 0.5-1.0; silicon Si: ≤0.15, sulfur S: ≤0.01, carbon C: ≤0.05, impurities: ≤0.5, and the balance is copper.

[0041] Copper and nickel can be infinitely dissolved in each other to form a continuous solid solution, so the copper-nickel alloy tube can be mixed freely in proportion. Pure copper plus nickel can significantly improve the strength, corrosion resistance and hardness, so the corrosion of the heat pipe 4 can be prevented and slowed down.

[0042] The above configuration ratio has been tested many times, and it is concluded that the heat pipe 4 with this ratio has deep drawing performance in terms of corrosion resistance, so that when the blades 7 are damaged and broken to produce gaps, the heat pipe 4 itself can resist and slow down the corrosion, thereby preventing the heat pipe 4 from being corroded and causing the evaporator efficiency to decrease or even become difficult to operate. Other ratios that can provide stronger corrosion resistance are also acceptable.

[0043] The surface of the heat pipe 4 is coated with an oil-soluble BTA layer as a corrosion inhibitor layer 9. The soluble BTA layer is a benzotriazole layer, which is dissolved in volatile oil and coated on the surface of the heat pipe 4. After drying, it can be stably adhered and inhibits the anode reaction in the corrosion structure, thereby slowing down the corrosion rate of the heat pipe 4. By coating the corrosion inhibitor on the surface of the heat pipe 4, the corrosion rate of the heat pipe 4 can be reduced, so that the heat pipe 4 can protect itself when the main fin is damaged and a gap is generated.

[0044] The heat pipe 4 is a U-shaped pipe, and a U-shaped connector 5 is welded and fixed to one end of the heat pipe 4 away from the U-shaped head, so that both ends of the heat pipe 4 are arc-shaped to avoid scratching people or other objects during transportation or movement.

[0045] Attach Figure 1 As shown, a base 3 is fixedly connected to the bottom of the end plate 1, and baffles 2 are fixedly connected to both sides of the end plate 1. The base 3 increases the contact area between the end plate 1 and the ground, so that the evaporator can work more stably. The baffle 2 can provide a certain protection for the connection between the end plate 1 and the heat pipe 4 to prevent the connection between the heat pipe 4 and the end plate 1 from being loosened due to impact.

Claims

1. A high efficiency evaporator, characterized in that: The invention comprises a heat pipe (4), a fin tube (6), and a protective sheet (8); the fin tube (6) is in a circular ring shape; the heat pipe (4) is inserted into the fin tube (6); the fin tube (6) is composed of a plurality of fins (7) arranged adjacent to each other; the cross section of the fins (7) is in a stepped shape; the fins (7) are arranged adjacent to each other in a horizontal manner; the left and right sides of the bottom end of the fins (7) are respectively welded to the fins (7) adjacent to each other on both sides; the bottom surface of the fins (7) is welded and fixed to the heat pipe (4); the protective sheet (8) is located at the upper end of the fins and is arranged horizontally; the two ends of the protective sheet (8) are respectively welded and fixed to the top ends of the two adjacent fins (7).

2. A high efficiency evaporator according to claim 1, characterized in that: The protective sheet (8) is in the shape of a hollow circular tube, and the two ends of the protective sheet (8) are in the shape of folded teeth.

3. A high efficiency evaporator according to claim 2, characterized in that: The protective sheet (8) is an aluminum foil protective sheet (8).

4. A high efficiency evaporator according to claim 3, characterized in that: The heat pipe (4) is a copper-nickel alloy pipe.

5. A high efficiency evaporator according to claim 4, characterized in that: The contents of the components of the heat pipe (4) are nickel + cobalt: 10.0, tin Sn: ≤0.03, zinc Zn: ≤0.3, lead Pb: ≤0.02, phosphorus P: ≤0.006, iron Fe: 1.0-1.5, manganese Mn: 0.5-1.0; silicon Si: ≤0.15, sulfur S: ≤0.01, carbon C: ≤0.05, impurities: ≤0.5, and the balance is copper.

6. A high efficiency evaporator according to claim 5, characterized in that: The heat pipe (4) is a U-shaped pipe, and a U-shaped connecting piece (5) is welded and fixed to one end of the heat pipe (4) away from the U-shaped head.

7. A high efficiency evaporator according to claim 6, characterized in that: The surface of the heat pipe (4) is coated with a corrosion inhibitor layer (9).

8. A high efficiency evaporator according to claim 7, characterized in that: The corrosion inhibitor layer (9) is an oil-soluble BTA layer.

9. A high efficiency evaporator according to claim 8, characterized in that: It also comprises an end plate (1), the bottom of the end plate (1) being fixedly connected to a base (3).

10. A high efficiency evaporator according to claim 9, characterized in that: Baffles (2) are fixedly connected to both sides of the end plate (1).

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