Heat exchanger and refrigeration device with delayed defrosting effect

Abstract

The present invention discloses a heat exchanger and refrigeration device with a delayed defrosting effect. The surface of the heat exchanger is coated with a hydrophobic anti-corrosion coating structure. The fin surface of the heat exchanger is stamped with a plurality of guide grooves. The inner and outer surfaces of the guide grooves are coated with a hydrophobic anti-corrosion coating structure. The hydrophobic anti-corrosion coating structure contains a polysiloxane coating. The present invention applies an anti-corrosion hydrophobic coating structure containing polysiloxane on the surface of the heat exchanger, so that water droplets are not easily adsorbed during normal operation of the unit, delaying frosting. During shutdown defrosting, after the ice layer on the contact surface with the heat exchanger melts, the remaining ice residue can slide off quickly, shortening the defrosting time, reducing the unit's defrosting downtime and frequency, and effectively preventing the refrigeration space from heating up. Thus, the performance of the refrigeration equipment is stable, energy saving and consumption reduction are reduced. In addition, by providing guide grooves and guide holes on the surface of the heat exchanger, condensed water is quickly gathered to form water droplets, which drip quickly due to the low rolling angle of the hydrophobic coating.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, in particular to a heat exchanger and a refrigeration device with delayed defrosting effect. Background Art

[0002] Rapid frosting and slow defrosting are bottlenecks facing refrigeration equipment manufacturers. During normal cooling, the surface temperature of the heat exchanger drops, causing water vapor in the surrounding air to condense. Once the temperature drops to a certain level, frost begins to form on the heat exchanger. Over time, the frost layer thickens, forming an ice layer. This ice layer reduces the heat exchange efficiency of the heat exchanger, causing the temperature of each chamber in the refrigeration unit to rise, increasing the unit's energy consumption.

[0003] At present, after the heat exchanger of the refrigeration device is frosted, it must be shut down or a heating device must be used to defrost it after shutdown. After shutdown, the device defrosts naturally by heating up through heat exchange or by using a low-power heating device. The frequency of shutdown for defrosting is high and the defrosting is slow. Long-term shutdown for defrosting, on the one hand, there is a risk of increased temperature in the refrigeration space and deterioration of stored items, and on the other hand, high energy consumption. Summary of the Invention

[0004] In order to overcome the above shortcomings of the prior art heat exchanger surface frosting unit, such as high frequency and long time of shutdown for defrosting, and high energy consumption during long-term shutdown for defrosting, the purpose of the present invention is to provide a heat exchanger and refrigeration device with delayed defrosting effect.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a heat exchanger with a delayed defrosting effect, the surface of the heat exchanger is coated with a hydrophobic anti-corrosion coating structure, and a plurality of guide grooves are stamped on the fin surface of the heat exchanger, and the inner and outer surfaces of the guide grooves are coated with a hydrophobic anti-corrosion coating structure.

[0006] As a further improvement of the present invention: the hydrophobic anti-corrosion coating structure contains a polysiloxane coating.

[0007] As a further improvement of the present invention: the guide groove is a V-shaped structure.

[0008] As a further improvement of the present invention: a guide hole is opened on the surface of the heat exchanger, and the guide hole is arranged at a slot position relative to the guide groove.

[0009] As a further improvement of the present invention: the guide groove is provided with a first guide groove and a second guide groove, the first guide groove is arranged obliquely downward, and the second guide groove is arranged vertically.

[0010] As a further improvement of the present invention: the first guide groove is connected to the second guide groove.

[0011] As a further improvement of the present invention: the height of the guide groove is 1.0-2.0 mm.

[0012] As a further improvement of the present invention: the hydrophobic anti-corrosion coating structure contains 42-50wt% n-butyl acetate, 10-13wt% solvent naphtha, 0.8-2wt% propylene glycol methyl ether acetate, 0.3-0.8wt% isobutyl methacrylate, 0.3-0.8wt% 2-methylpropane acetic acid, 11-14wt% polysiloxane, and 4-7wt% silazane.

[0013] As a further improvement of the present invention: the heat exchanger is a fin evaporator.

[0014] A refrigeration device includes a heat exchanger with a delayed defrosting effect as described above, and a refrigeration chamber, an ice-making chamber, a freezer chamber, and a fruit and vegetable chamber arranged in sequence from top to bottom. The heat exchanger is an evaporator, a fan is provided above the evaporator, a condenser and a compressor are provided behind the fruit and vegetable chamber, the compressor is connected to the evaporator, a first air supply duct and a first return air duct are provided between the refrigeration chamber and the ice-making chamber, and a second air supply duct and a second return air duct are provided between the freezer chamber and the fruit and vegetable chamber.

[0015] A refrigeration device comprises the heat exchanger with delayed defrosting effect as described above, and a refrigeration chamber, an ice-making chamber, a freezer chamber and a fruit and vegetable chamber arranged in sequence from top to bottom. The heat exchanger is an evaporator, and the evaporators are respectively installed behind the refrigeration chamber, the ice-making chamber, the freezer chamber and the fruit and vegetable chamber. A fan is provided above the evaporator, and a condenser and a compressor are provided behind the fruit and vegetable chamber, and the compressor is connected to the evaporator.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention applies a corrosion-resistant, hydrophobic coating structure containing polysiloxane to the surface of the heat exchanger. During normal operation of a unit using this heat exchanger, water droplets are less likely to be adsorbed, delaying frost formation. During defrosting, after the ice layer on the contact surface with the heat exchanger melts, the remaining ice debris slides off quickly, shortening the defrosting time. This can reduce the unit's defrosting downtime and frequency, effectively preventing temperature rise in the refrigerated space, thereby stabilizing refrigeration equipment performance and reducing energy consumption.

[0018] 2. The heat exchanger with delayed defrost effect has strong corrosion resistance and can effectively prevent the corrosive media discharged or leaked from the stored materials from corroding the heat exchanger, thereby increasing the service life of the refrigeration equipment.

[0019] 3. The present invention also provides guide grooves and guide holes on the surface of the heat exchanger, so that the condensed water quickly gathers to form water droplets and drips quickly due to the low rolling angle of the hydrophobic coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the heat exchanger structure.

[0021] Figure 2 Schematic diagram of the structure of the heat exchanger fin.

[0022] Figure 3 It is a structural diagram of the refrigeration device.

[0023] Figure numerals: 1. heat exchanger, 11. fin, 111. guide hole, 12. guide groove, 121. first guide groove, 122. second guide groove, 2. evaporator, 3. refrigerator, 4. ice making room, 5. freezer, 6. fruit and vegetable room, 7. condenser, 8. compressor. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In order to solve the technical problems in the prior art, the present invention is further described with reference to the accompanying drawings and embodiments:

[0026] like Figure 1-Figure 2 As shown, the present invention discloses a heat exchanger with a delayed defrosting effect, wherein the surface of the heat exchanger 1 is coated with a hydrophobic anti-corrosion coating structure, and a plurality of guide grooves 12 are stamped on the surface of the fin 11 of the heat exchanger 1, and the inner and outer surfaces of the guide grooves 12 are coated with a hydrophobic anti-corrosion coating structure.

[0027] Preferably, the hydrophobic anti-corrosion coating structure contains a polysiloxane coating.

[0028] Preferably, the guide groove 12 is a V-shaped structure.

[0029] Preferably, a guide hole 111 is opened on the surface of the heat exchanger 1 , and the guide hole 111 is arranged at a slot position relative to the guide groove 12 .

[0030] Preferably, the guide groove 12 is provided with a first guide groove 121 and a second guide groove 122 , wherein the first guide groove 121 is arranged to be inclined downward, and the second guide groove 122 is arranged to be vertical.

[0031] Preferably, the first guide groove 121 is communicated with the second guide groove 122 .

[0032] Preferably, the height of the guide groove 12 is 1.0-2.0 mm.

[0033] Preferably, the hydrophobic anti-corrosion coating structure contains 42-50wt% n-butyl acetate, 10-13wt% solvent naphtha, 0.8-2wt% propylene glycol methyl ether acetate, 0.3-0.8wt% isobutyl methacrylate, 0.3-0.8wt% 2-methylpropane acetic acid, 11-14wt% polysiloxane, and 4-7wt% silazane.

[0034] Preferably, the heat exchanger 1 is a fin evaporator.

[0035] The present invention applies a corrosion-resistant, hydrophobic coating structure containing polysiloxane to the surface of the heat exchanger. This prevents condensed water droplets from being adsorbed, delaying frosting. During defrosting, after the ice layer on the contact surface with the heat exchanger melts, the remaining ice debris slides off quickly, shortening the defrosting time. This can reduce the duration and frequency of defrosting downtime for the unit, effectively preventing temperature rise in the refrigerated space, thereby stabilizing the performance of the refrigeration equipment and reducing energy consumption.

[0036] Example 1

[0037] like Figure 1-Figure 2 As shown, this embodiment discloses a heat exchanger with a delayed defrosting effect, wherein the surface of the heat exchanger 1 is coated with a hydrophobic anti-corrosion coating structure, and a plurality of guide grooves 12 are stamped on the surface of the fin 11 of the heat exchanger 1, and the inner and outer surfaces of the guide grooves 12 are coated with a hydrophobic anti-corrosion coating structure, which is used to allow the condensed water to quickly gather into water droplets and be discharged.

[0038] Preferably, the hydrophobic anti-corrosion coating structure contains a polysiloxane coating.

[0039] Hydrophobic mechanism: The polysiloxane molecular chain is curled and has a spiral structure. The intermolecular force is very weak and the surface energy is low. During the film formation process of the polysiloxane coating, the silicone part migrates to the surface of the coating and arranges on the surface of the coating. The siloxane molecules on the molecular chain are oriented at the coating / air interface, obtaining a higher surface hydrophobicity.

[0040] Delayed defrosting mechanism: The diameter of a water droplet is much larger than the distance between the coating's surface nipples. Therefore, when a water droplet contacts the coating, it rests on the top of the nipples. The low-surface-energy nipples create numerous grooves, preventing the droplet from sinking into the grooves. Instead, the droplet forms an air cushion with the coating surface, significantly reducing the rolling angle and facilitating the droplet's sliding motion. This increases the difficulty of ice crystal nucleation and slows the nucleation rate. Furthermore, the surface ridges shift contact from surface to point contact, reducing heat transfer efficiency and ice crystal growth rate, thus prolonging the frost-forming time of the hydrophobic-coated evaporator.

[0041] Preferably, the hydrophobic anti-corrosion coating structure further contains a silazane coating.

[0042] Process for coating the hydrophobic anti-corrosion coating structure on the surface of the heat exchanger:

[0043] After the heat exchanger is processed, it is degreased and rust-removed before being dip-coated with a hydrophobic coating, as follows:

[0044] Rough cleaning and degreasing: clean the heat exchanger with a 5% concentration of detergent at 40-60℃ for 1-3 minutes;

[0045] Fine degreasing: clean the heat exchanger with a 2% concentration of detergent at 40-60°C for 1-3 minutes;

[0046] Rinse: Rinse the heat exchanger with water at room temperature of 15-25℃ for 3-5 minutes, at least once;

[0047] Drying: Allow the surface of the heat exchanger substrate to dry naturally to ensure there is no moisture or water stains;

[0048] Spray coating or dip coating: 1) preparing a coating or coating liquid by adding 42-50 wt% of n-butyl acetate, 10-13 wt% of solvent naphtha, 0.8-2 wt% of propylene glycol methyl ether acetate, 0.3-0.8 wt% of isobutyl methacrylate, 0.3-0.8 wt% of 2-methylpropane acetic acid, 11-14 wt% of polysiloxane, and 4-7 wt% of silazane;

[0049] Preferably, the content of the polysiloxane in the coating or coating liquid is 12 wt %, which improves the hydrophobic and anti-corrosion effects.

[0050] Use a spray gun to spray the prepared coating on the surface of the heat exchanger, or dip the heat exchanger into the prepared coating solution;

[0051] Curing: At room temperature 15-25℃, let it stand for 90 minutes to allow the heat exchanger surface to air dry, and then let it stand for 48 hours to allow the heat exchanger surface to completely dry and form a coating structure on the heat exchanger surface.

[0052] Preferably, the guide groove 12 is a V-shaped structure.

[0053] Preferably, the surface of the fin 11 of the heat exchanger 1 is provided with a first slope structure and a second slope structure, and the first slope structure and the second slope structure are arranged opposite to each other to form a guide groove 12.

[0054] Preferably, the guide groove 12 forms a convex portion on one surface of the fin 11 of the heat exchanger 1 and a concave portion on the other surface of the fin 11 of the heat exchanger 1 .

[0055] Preferably, a guide hole 111 is opened on the surface of the heat exchanger 1, and the guide hole 111 is arranged relative to the slot position of the guide groove 12. The combination of the through hole between the two ends of the guide groove 12 and the guide hole 111 prevents condensed water from staying on the surface of the guide groove 12 and frosting after a long time.

[0056] The guide groove 12 is convex on one surface of the heat exchanger 1 and concave on the other surface. The condensed water on one surface of the heat exchanger 1 slides down along the convex slope structure of the guide groove 12, and the condensed water on the other surface of the heat exchanger 1 slides down along the concave notch of the guide groove 12.

[0057] Preferably, the length of the guide hole 111 is greater than or equal to the length of the guide groove 12 .

[0058] Preferably, the guide groove 12 is provided with a first guide groove 121 and a second guide groove 122 , wherein the first guide groove 121 is arranged to be inclined downward, and the second guide groove 122 is arranged to be vertical.

[0059] Preferably, the first guide groove 121 is connected to the second guide groove 122. The second guide groove 122 is connected to one end of the first guide groove 121, or the second guide groove 122 is arranged in the middle of the first guide groove 121.

[0060] Preferably, the height of the guide groove 12 is 1.0-2.0 mm.

[0061] More preferably, the height of the guide groove 12 is 1.0 mm.

[0062] More preferably, the height of the guide groove 12 is 1.7 mm.

[0063] The hydrophobic coating structure also has an anti-corrosion function, and its anti-corrosion mechanism is as follows: the spherical polysiloxane particles have a large specific surface area and more atoms on the surface. The crystal field environment and binding energy of the surface atoms are different from those of the atoms inside the substance, which causes an increase in surface energy. It has great activity, greatly improving the bonding strength between the unsaturated bonds between the protected metal and the coating, so that the bonding force between the coating and the base metal, and the "bonding force" of the coating and the base metal surface formed are much greater than the expansion stress of the corrosion electrochemical reactants on the coating and the metal surface, so that the corrosion electrochemical reaction formed between the metal and the coating due to the presence of electrolyte and oxygen loses the space to extend to the surrounding areas and cannot continue, thereby achieving the purpose of inhibiting corrosion.

[0064] Preferably, the heat exchanger 1 is a fin evaporator, and the surface of the fin 11 of the fin evaporator is coated with a hydrophobic anti-corrosion coating structure and is provided with the above-mentioned guide groove 12 structure.

[0065] Preferably, the heat exchanger 1 is a fin condenser 7 , and the surface of the fin 11 of the fin condenser 7 is coated with a hydrophobic anti-corrosion coating structure and is provided with the above-mentioned guide groove 12 structure.

[0066] Example 2

[0067] like Figure 1-Figure 3 As shown, this embodiment discloses a refrigeration device, including the above-mentioned heat exchanger 1 with delayed defrosting effect, and a refrigerating chamber 3, an ice-making chamber 4, a freezing chamber 5 and a fruit and vegetable chamber 6 arranged in sequence from top to bottom. The heat exchanger 1 is an evaporator 2, and the evaporator 2 is located behind the freezing chamber 5 and the ice-making chamber 4. A fan is provided above the evaporator 2, and a condenser 7 and a compressor 8 are provided behind the fruit and vegetable chamber 6, and the compressor 8 is connected to the evaporator 2.

[0068] A first air supply duct and a first air return duct are provided between the refrigerating chamber 3 and the ice making chamber 4 , and a second air supply duct and a second air return duct are provided between the freezing chamber 5 and the fruit and vegetable chamber 6 .

[0069] After the evaporator 2 of the refrigeration unit is finished and degreased and rust-removed, it is then dip-coated with a hydrophobic coating. During operation, the cool air surrounding the evaporator 2 is forced through convection by a fan, circulating throughout the refrigeration unit's air system channels to lower the temperature of each chamber within the unit. As the refrigerant system continues to operate, water vapor in the air within the air system channels continuously condenses on the surface of the evaporator 2. When the temperature drops to a certain level, frost begins to form on the surface of the evaporator 2. Over time, the frost layer thickens, forming an ice layer. Due to the ice layer's obstruction, the heat exchange efficiency of the evaporator 2 decreases, causing the temperature of each chamber in the refrigeration system to rise, increasing the energy consumption of the refrigeration unit.

[0070] After the hydrophobic coating is added to the surface of the evaporator 2, the water vapor in the air in the wind system channel condenses on the surface of the evaporator 2. The condensed water droplets will form water droplets, which are not easy to spread flat on the surface of the evaporator 2. Under the action of the fan, they are more likely to slide down, thereby extending the frosting time of the evaporator 2. After a period of operation, a certain thickness of ice layer is generated on the evaporator 2. The unit is shut down for defrosting. After the ice layer in contact with the surface of the evaporator 2 melts, the remaining ice layer will slide down quickly due to the hydrophobicity of the coating, thereby shortening the defrosting time of the unit. The evaporator 2 with an anti-corrosion hydrophobic coating prolongs the frosting time and shortens the defrosting time, thereby reducing the frequency of the unit's shutdown for defrosting and the time of a single defrost, ensuring the stability of the refrigeration system of the refrigeration equipment and reducing the energy consumption of the unit.

[0071] The main functions of this embodiment are as follows: by coating the surface of the heat exchanger 1 with a hydrophobic, corrosion-resistant, safe and non-toxic coating, the frost formation of the refrigeration equipment is delayed during operation, and ice residues fall off quickly during the shutdown and defrosting process, effectively shortening the overall shutdown and defrosting frequency and time, making the equipment's refrigeration effect more stable and energy consumption lower. The highly corrosion-resistant coating can effectively improve the corrosion resistance of the evaporator 2 and extend the service life of the entire refrigeration equipment.

[0072] Example 3

[0073] This embodiment discloses a refrigeration device, comprising the above-mentioned heat exchanger 1 with a delayed defrost effect, and a refrigerating chamber 3, an ice-making chamber 4, a freezing chamber 5, and a fruit and vegetable chamber 6 arranged in order from top to bottom. The heat exchanger 1 is an evaporator 2, and the evaporators 2 are respectively installed behind the refrigerating chamber 3, the ice-making chamber 4, the freezing chamber 5, and the fruit and vegetable chamber 6. A fan is provided above the evaporator 2, and a condenser 7 and a compressor 8 are provided behind the fruit and vegetable chamber 6. The compressor 8 is connected to the evaporator 2.

[0074] Instead of using an air-cooled circulation system to lower the temperature of each chamber, the evaporator 2 with a hydrophobic coating is directly placed in each temperature-controlled chamber. This shortens the unit's defrosting time. The evaporator 2 with a corrosion-resistant hydrophobic coating structure prolongs the frosting time and shortens the defrosting time, thereby reducing the frequency of unit shutdowns for defrosting and the time required for a single defrost, ensuring the stability of the refrigeration system and reducing the unit's energy consumption.

[0075] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0076] The foregoing description is intended only to provide specific embodiments of the present invention, intended to enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A heat exchanger with delayed defrosting effect, characterized in that: The surface of the heat exchanger is coated with a hydrophobic anti-corrosion coating structure, and a plurality of guide grooves are stamped on the fin surface of the heat exchanger. The inner and outer surfaces of the guide grooves are coated with a hydrophobic anti-corrosion coating structure. The surface of the heat exchanger is provided with guide holes, and the guide holes are arranged relative to the groove positions of the guide grooves. The hydrophobic anti-corrosion coating structure contains 42-50wt% n-butyl acetate, 10-13wt% solvent naphtha, 0.8-2wt% propylene glycol methyl ether acetate, 0.3-0.8wt% isobutyl methacrylate, 0.3-0.8wt% 2-methylpropanol acetic acid, 11-14wt% polysiloxane, and 4-7wt% silazane.

2. The heat exchanger with delayed defrosting effect according to claim 1, characterized in that: The guide groove is a V-shaped structure.

3. The heat exchanger with delayed defrosting effect according to claim 1, characterized in that: The guide groove is provided with a first guide groove and a second guide groove, the first guide groove is arranged obliquely downward, and the second guide groove is arranged vertically.

4. The heat exchanger with delayed defrosting effect according to claim 3, characterized in that: The first guide groove is communicated with the second guide groove.

5. A heat exchanger with delayed defrosting effect according to any one of claims 1 to 4, characterized in that: The heat exchanger is a fin evaporator.

6. A refrigeration device, characterized in that: The invention comprises a heat exchanger with a delayed defrosting effect as described in any one of claims 1 to 4, and a refrigeration chamber, an ice-making chamber, a freezer chamber and a fruit and vegetable chamber arranged in sequence from top to bottom, wherein the heat exchanger is an evaporator, a fan is provided above the evaporator, a condenser and a compressor are provided behind the fruit and vegetable chamber, the compressor is connected to the evaporator, a first air supply duct and a first return air duct are provided between the refrigeration chamber and the ice-making chamber, and a second air supply duct and a second return air duct are provided between the freezer chamber and the fruit and vegetable chamber.

7. A refrigeration device, characterized in that: It comprises a heat exchanger with a delayed defrost effect as described in any one of claims 1 to 4, and a refrigeration chamber, an ice-making chamber, a freezer chamber and a fruit and vegetable chamber arranged in sequence from top to bottom, wherein the heat exchanger is an evaporator, and the evaporators are respectively installed behind the refrigeration chamber, the ice-making chamber, the freezer chamber and the fruit and vegetable chamber, a fan is provided above the evaporator, and a condenser and a compressor are provided behind the fruit and vegetable chamber, and the compressor is connected to the evaporator.

Images