Air conditioner

Abstract

The application discloses an air conditioner, which comprises an air conditioner outdoor unit and an air conditioner indoor unit, the air conditioner indoor unit comprises an indoor unit shell and an indoor heat exchanger arranged in the air conditioner indoor unit shell, the air conditioner outdoor unit comprises an outdoor unit shell and a compressor, a liquid storage tank, an outdoor heat exchanger and a four-way valve assembly arranged in the outdoor unit shell, the compressor, the four-way valve assembly, the outdoor heat exchanger, the indoor heat exchanger and the liquid storage tank are sequentially communicated to form a refrigerant closed loop, and the surface of at least one of the indoor unit shell, the outdoor unit shell, the compressor, the liquid storage tank and the four-way valve assembly is coated with a polyurea protective layer. The air conditioner of the technical scheme can significantly improve the structural strength and high-temperature resistance, and effectively prevent deformation damage.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioner. Background Technology

[0002] With the increasing popularity of air conditioners and consumers' growing demands for their performance, high quality and comfort have become key competitive goals for air conditioner manufacturers. Currently, air conditioner outdoor and indoor units typically require transportation from the manufacturer to the consumer's home. During transportation, they inevitably experience drops and collisions. To reduce deformation of the casing and damage to major components such as the compressor and four-way valve assembly during drop transportation, foam or thickened sheet metal is usually used to wrap the outdoor or indoor unit, or shock-absorbing cotton is added internally, and the walls of internal components are thickened. However, increasing foam or shock-absorbing cotton increases packaging size and internal space, and also increases packaging material costs. Increasing sheet metal thickness further increases the weight of the air conditioner, resulting in greater impact inertia, and also reduces internal space, affecting its performance. Summary of the Invention

[0003] The main objective of this invention is to propose an air conditioner that addresses the problem of low strength and easy deformation and damage of the air conditioner's shell structure and internal components.

[0004] To achieve the above objectives, the air conditioner disclosed in this invention includes an outdoor unit and an indoor unit. The indoor unit includes an indoor unit casing and an indoor heat exchanger disposed in the indoor unit casing. The outdoor unit includes an outdoor unit casing and a compressor, a liquid receiver, an outdoor heat exchanger, and a four-way valve assembly disposed within the outdoor unit casing. The compressor, the four-way valve assembly, the outdoor heat exchanger, the indoor heat exchanger, and the liquid receiver are sequentially connected to form a refrigerant closed loop.

[0005] At least one of the indoor unit housing, outdoor unit housing, compressor, liquid storage tank, and four-way valve assembly has a polyurea protective layer coated on its surface.

[0006] In an optional embodiment, the indoor unit housing includes a front frame and an indoor front panel covering the front frame, wherein the polyurea protective layer is coated on the inner surface of the indoor front panel facing the front frame.

[0007] In an optional embodiment, the interior front panel includes a panel body and a buckle disposed on the panel body. The surface of the face frame is provided with a locking hole for engaging and securing with the buckle. The outer surface of the buckle is coated with the polyurea protective layer.

[0008] In an optional embodiment, the outdoor unit housing includes an outdoor front panel, a top cover, a right side panel, and a chassis connected together. The outdoor front panel, top cover, right side panel, and chassis enclose a receiving cavity. The polyurea protective layer is coated at the corners of at least one of the outdoor front panel, top cover, right side panel, and chassis.

[0009] In an optional embodiment, the polyurea protective layer is applied to the joint of any two connected parts of the outdoor front panel, top cover, right side panel and chassis.

[0010] And / or, the inner and / or outer surfaces of the chassis are coated with the polyurea protective layer;

[0011] And / or, the outer surface of the chassis is provided with feet, and the inner and / or outer surfaces of the feet are coated with the polyurea protective layer.

[0012] In an optional embodiment, the outdoor unit housing further includes a partition plate connected to the chassis to divide the receiving cavity into a fan cavity and a compressor cavity, wherein the cavity wall of the compressor cavity is coated with the polyurea protective layer.

[0013] In an optional embodiment, the chassis includes a compression chamber and a fan chamber, the compression chamber having a connecting post protruding and connected to the compressor, the surface of the connecting post being coated with the polyurea protective layer.

[0014] In an optional embodiment, the outdoor unit of the air conditioner further includes a compressor base frame, the compressor is fixed on the compressor base frame, the compressor base frame has a mounting hole, a foot pad is provided between the compressor base frame and the connecting column, the foot pad is sleeved on the connecting column and partially passes through the mounting hole, a fastener locks the connecting column and abuts against the compressor base frame, and at least a portion of the outer surface of the foot pad is coated with the polyurea protective layer.

[0015] In an optional embodiment, the foot pad includes a base portion and a throat portion protruding from the middle of the base portion. The end face of the base portion facing the throat portion is a first platform, and the end face of the throat portion is a second platform. The polyurea protective layer is disposed on the outer surface of the base portion or on the circumferential surface of the base portion.

[0016] And / or, the foot pad has a through foot pad hole, and the inner wall of the foot pad hole is coated with the polyurea protective layer;

[0017] And / or, the surface of the compressor base facing the chassis is coated with the polyurea protective layer.

[0018] In an optional embodiment, the thickness D1 of the polyurea protective layer coated on the cavity wall of the compressor cavity is 0.5 mm to 5 mm;

[0019] And / or, the thickness D2 of the polyurea protective layer coated on the outer surface of the compressor is in the range of 0.25mm to 50mm;

[0020] And / or, the thickness D3 of the polyurea protective layer coated on the outer surface of the storage tank is in the range of 0.25 mm to 60 mm;

[0021] And / or, the compressor is connected to the liquid storage tank via a connecting pipe, and the outer circumferential surface of the connecting pipe is coated with the polyurea protective layer.

[0022] In an optional embodiment, the four-way valve assembly includes a four-way valve and an exhaust pipe, a return pipe, a low-pressure valve assembly, and a valve cooling pipe connected to the four outlets of the four-way valve. The exhaust pipe is connected to the exhaust port of the compressor, the return pipe is connected to the return port of the liquid storage tank, the low-pressure valve assembly is connected to the indoor heat exchanger, and the valve cooling pipe is connected to the outdoor heat exchanger. At least one of the exhaust pipe, return pipe, low-pressure valve assembly, valve cooling pipe, and four-way valve has its outer surface coated with the polyurea protective layer.

[0023] In an optional embodiment, the periphery of the connection position between the exhaust pipe and the exhaust port of the compressor is coated with a polyurea weld protection layer;

[0024] Furthermore, the periphery of the connection position between the return gas pipe and the return gas port of the liquid storage tank is coated with the polyurea weld protection layer.

[0025] In an optional embodiment, the polyurea weld protection layer covers the exhaust pipe at a height of H1, where H1 ranges from 20mm to 35mm.

[0026] And / or, the polyurea weld protection layer covers the return gas pipe at a height of H2, where H2 ranges from 35mm to 40mm;

[0027] And / or, the coating thickness D4 of the polyurea protective layer in the exhaust pipe, return pipe, low-pressure valve assembly, valve cooling pipe and four-way valve ranges from 0.5mm to 3.5mm.

[0028] In an optional embodiment, a polyurea pipe interconnect coating is formed between the pipe segments parallel to the exhaust pipe and the return pipe.

[0029] And / or, the portion of the exhaust pipe near the chassis is coated with a polyurea counterweight coating.

[0030] In an optional embodiment, the outdoor unit housing further includes a large handle structure connected to the outer surface of the right side panel, and the inner and / or outer surfaces of the large handle structure are coated with a polyurea fire-retardant layer.

[0031] In an optional embodiment, the compressor end is further provided with a compressor terminal, and the compressor end is connected to a compressor terminal cover covering the compressor terminal, the inner surface of the compressor terminal cover being coated with a polyurea fireproof layer;

[0032] And / or, the indoor unit of the air conditioner also includes an electrical control box disposed inside the housing of the indoor unit, the electrical control box having multiple wiring terminals, and the inner and / or outer surfaces of the electrical control box being coated with a polyurea fireproof layer.

[0033] In an optional embodiment, the air conditioner further includes two fan structures, one of which is located in the indoor unit and the other in the outdoor unit. Each fan structure includes a hub and a plurality of blades, the plurality of blades being spaced apart on the circumferential surface of the hub, and each blade having a first surface and a second surface opposite to each other; the first surface and / or the second surface is covered with the polyurea protective layer.

[0034] In an optional embodiment, the blade is made of polypropylene;

[0035] And / or, the fan structure is an axial flow fan or a centrifugal fan.

[0036] In an optional embodiment, when the fan structure is an axial flow fan, the first surface of the blade faces the air inlet side of the fan structure, the second surface of the blade faces the air outlet side of the fan structure, and the outer edge surface of the first polyurea protective layer covering the second surface is set at an angle α with the outer edge surface of the blade, wherein the angle α ranges from 2° to 8°.

[0037] In an optional embodiment, in the direction from the hub to the edge of the blade, the width of the outer edge surface of the first polyurea protective layer covering the second surface is set to L, wherein the value of L ranges from 3mm to 7mm.

[0038] In an optional embodiment, the fan structure further includes a motor and a locking member. The hub is mounted on the drive shaft of the motor, the free end of the drive shaft extends out of the end face of the hub, the end face of the hub facing away from the motor is coated with a polyurea damping layer, and the locking member is mounted on the free end of the drive shaft and abuts against the polyurea damping layer.

[0039] In an optional embodiment, the thickness D5 of the polyurea protective layer coated on the blade ranges from 0.5 mm to 3 mm;

[0040] And / or, the thickness D6 of the polyurea damping layer is 3mm to 6mm.

[0041] In an optional embodiment, the surface of the polyurea protective layer coated on the blade is provided with a plurality of protrusions and recesses arranged in a matrix.

[0042] In an optional embodiment, when the fan structure is a centrifugal fan, the hub includes a base plate and a surrounding plate connected to the periphery of the base plate, a plurality of blades are spaced apart on the inner periphery of the surrounding plate, and the surrounding plate has an air outlet.

[0043] The polyurea protective layer is provided on the surface of the base plate opposite to the enclosure plate;

[0044] And / or, the outer periphery of the enclosure is provided with the polyurea protective layer.

[0045] The air conditioner of this invention includes an indoor unit and an outdoor unit. At least one of the indoor unit casing, outdoor unit casing, compressor, liquid receiver, and four-way valve assembly is coated with a polyurea protective layer. This polyurea protective layer is formed by curing polyurea material. Because polyurea material has good tensile strength, flexibility, aging resistance, and wear resistance, the polyurea protective layer, formed by the orderly connection and filling of its internal dot-like or linear structures layer by layer, possesses energy absorption, noise damping, impact resistance, and high-temperature resistance. Therefore, coating the indoor unit casing and / or outdoor unit casing with a polyurea protective layer effectively improves the overall strength and high-temperature resistance of the indoor unit casing and / or outdoor unit casing, increases its deformation resistance, reduces deformation during transportation, and enhances the protection of the internal structure. When a polyurea protective layer is applied to the surface of at least one of the compressor, liquid receiver, and four-way valve assembly, its structural strength can be improved without increasing the wall thickness, thus saving costs and space and reducing the chance of damage. On the other hand, it can solve the resonance problem generated during the operation of the air conditioner and reduce the noise caused by vibration, thereby improving the transportation safety and service life of the air conditioner. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort. Attached image description:

[0048] Figure 1 This is a schematic diagram of the structure of an embodiment of the indoor unit of the air conditioner of the present invention;

[0049] Figure 2 for Figure 1 A structural schematic diagram of the indoor unit of the air conditioner from another perspective;

[0050] Figure 3 for Figure 1 An exploded view of an embodiment of the indoor front panel of an air conditioner indoor unit shown;

[0051] Figure 4 for Figure 1 An exploded view of another embodiment of the indoor front panel of the air conditioner indoor unit shown;

[0052] Figure 5 for Figure 1 A schematic diagram of the electrical control box in an embodiment of an air conditioner indoor unit is shown.

[0053] Figure 6 for Figure 5 Exploded view of the electrical control box shown;

[0054] Figure 7 This is a schematic diagram of the structure of an embodiment of the outdoor unit of the air conditioner of the present invention;

[0055] Figure 8 for Figure 7 The exploded view of the outdoor unit of the air conditioner is shown.

[0056] Figure 9 for Figure 8 An exploded view of the outdoor unit of the air conditioner from another perspective;

[0057] Figure 10 This is an exploded view of yet another embodiment of the outdoor unit of the air conditioner in the present invention;

[0058] Figure 11 for Figure 10 An exploded view of an embodiment of the base plate of an outdoor air conditioning unit shown;

[0059] Figure 12 for Figure 10 The image shows a front view of another embodiment of the base plate of the outdoor unit of the air conditioner;

[0060] Figure 13 for Figure 12 A sectional view along line AA.

[0061] Figure 14 for Figure 10 An exploded view of another embodiment of the base plate of the outdoor unit of the air conditioner shown;

[0062] Figure 15 for Figure 10 The exploded view of the base plate and compressor of the outdoor unit of the air conditioner is shown.

[0063] Figure 16 for Figure 10 An exploded view of an embodiment of the compressor, liquid receiver tank, and compressor base frame in the outdoor unit of an air conditioner shown;

[0064] Figure 17 for Figure 10 An exploded view of yet another embodiment of the compressor and liquid receiver in the outdoor unit of an air conditioner;

[0065] Figure 18 for Figure 10 An exploded view of another embodiment of the compressor and liquid receiver in the outdoor unit of the air conditioner shown;

[0066] Figure 19 for Figure 18 A cross-sectional view of the compressor end cover in the compressor shown;

[0067] Figure 20 This is a schematic diagram of the structure of the outdoor unit of the air conditioner of the present invention with part of the outdoor unit casing removed in another embodiment;

[0068] Figure 21 for Figure 20 The diagram shows the structure of the compressor, liquid receiver, and four-way valve assembly in the outdoor unit of the air conditioner.

[0069] Figure 22 for Figure 21 Another structural schematic diagram of the compressor, liquid tank and four-way valve assembly shown in the image;

[0070] Figure 23 for Figure 21 An exploded view of the four-way valve assembly shown.

[0071] Figure 24 for Figure 21 A partial cross-sectional view of the four-way valve assembly shown;

[0072] Figure 25 for Figure 20 An exploded view of an embodiment of the large handle structure in the outdoor unit of an air conditioner shown;

[0073] Figure 26 for Figure 20 An exploded view of yet another embodiment of the large handle structure in the outdoor unit of the air conditioner shown;

[0074] Figure 27 for Figure 20 The diagram shows a structural schematic of one embodiment of the motor bracket and fan structure in the outdoor unit of an air conditioner.

[0075] Figure 28 for Figure 27 The exploded view of the motor bracket and fan structure shown is shown.

[0076] Figure 29 for Figure 27 An exploded view of the motor bracket and fan structure from another perspective;

[0077] Figure 30 for Figure 20 An exploded view of a partial structure of the motor bracket and fan structure in another embodiment of the air conditioner outdoor unit shown;

[0078] Figure 31 for Figure 29 The front view of the fan structure shown;

[0079] Figure 32 for Figure 31 A cross-sectional view along line BB in the fan structure shown;

[0080] Figure 33 for Figure 32 Enlarged view of point C in the middle;

[0081] Figure 34 This is a schematic diagram of another embodiment of the fan structure in the air conditioner of the present invention;

[0082] Figure 35 for Figure 34 A sectional view along the DD line;

[0083] Figure 36 This is an exploded view of another embodiment of the fan structure in the air conditioner of the present invention.

[0084] Explanation of icon numbers:

[0085]

[0086]

[0087] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0088] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0089] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0090] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0091] This invention proposes an air conditioner.

[0092] Please refer to Figure 1 , Figure 7 , Figure 10 , Figure 17 and Figure 23 In one embodiment of the present invention, the air conditioner includes an outdoor unit 100 and an indoor unit 200. The indoor unit 200 includes an indoor unit housing 210 and an indoor heat exchanger 240 disposed in the housing of the indoor unit 200. The outdoor unit 100 includes an outdoor unit housing 10 and a compressor 50, a liquid receiver 80, an outdoor heat exchanger 60, and a four-way valve assembly 70 disposed in the outdoor unit housing 10. The compressor 50, the four-way valve assembly 70, the outdoor heat exchanger 60, the indoor heat exchanger 240, and the liquid receiver 80 are sequentially connected to form a refrigerant closed loop.

[0093] At least one of the indoor unit housing 210, outdoor unit housing 10, compressor 50, liquid storage tank 80, and four-way valve assembly 70 is coated with a polyurea protective layer 900.

[0094] As is known, the air conditioner includes an indoor unit 200 and an outdoor unit 100. The indoor unit 200 includes an indoor unit casing 210 and components housed therein, and the outdoor unit 100 includes the indoor unit casing 210 and components housed therein. During the use of the air conditioner, the indoor unit casing 210 and its internal components, as well as the outdoor unit casing 100 and its internal components, will be subject to varying degrees of corrosion or stress fatigue. Therefore, structural improvements are needed to enhance their strength. Here, the principle by which the air conditioner regulates ambient temperature through refrigerant circulation in the compressor 50, four-way valve assembly 70, outdoor heat exchanger 60, indoor heat exchanger 240, and liquid receiver 80 remains unchanged and is the same as that of existing air conditioners, so it will not be elaborated further.

[0095] In this embodiment, the polyurea protective layer 900 is formed by coating a polyurea polymer synthetic material onto the surface of the component structure and then solidifying it. Here, the polyurea polymer synthetic material is composed of two liquid components, each consisting of a polymer material and a nanomaterial. One component provides hardness, and the other provides flexibility. After the mixture solidifies, it forms a tough protective coating. Tests have verified that this protective coating has a tensile strength greater than 30 MPa, an elongation at break of 90%–1000%, an impact resistance greater than 1 kg·m, and an adhesion greater than 9 MPa, exhibiting excellent performance stability. The polyurea protective layer 900 can be sprayed onto the component surface using high-temperature, high-pressure spraying equipment. Automated spraying improves the uniformity of the spray and allows for precise control of the spray thickness, thus enhancing the formation stability of the polyurea protective layer 900. Of course, in other embodiments, manual spraying is also possible. Therefore, the polyurea protective layer 900 can be applied to the surface of at least one of the indoor unit housing 210, outdoor unit housing 10, compressor 50, liquid receiver 80, and four-way valve assembly 70. That is, the polyurea protective layer 900 can be applied to the indoor unit housing 210, outdoor unit housing 10, compressor 50, liquid receiver 80, or four-way valve assembly 70 alone, or in combination of two, three, or four of the indoor unit housing 210, outdoor unit housing 10, compressor 50, liquid receiver 80, and four-way valve assembly 70, or the polyurea protective layer 900 can be applied to all of the indoor unit housing 210, outdoor unit housing 10, compressor 50, liquid receiver 80, and four-way valve assembly 70.

[0096] The air conditioner of this invention includes an indoor unit 200 and an outdoor unit 100. At least one of the indoor unit casing 210, the outdoor unit casing 10, the compressor 50, the liquid receiver 80, and the four-way valve assembly 70 is coated with a polyurea protective layer 900. Here, the polyurea protective layer 900 is formed by curing polyurea material. Because polyurea material has good tensile strength, flexibility, aging resistance, and wear resistance, the polyurea protective layer 900, formed by the orderly connection and filling of the dot-like or linear structure inside the material and the layering of layers, has energy absorption, noise damping, impact resistance, and high temperature resistance. Therefore, when the polyurea protective layer 900 is coated on the indoor unit casing 210 and / or the outdoor unit casing 10, the overall strength and high temperature resistance of the indoor unit casing 210 and / or the outdoor unit casing 10 are effectively improved, the deformation resistance is high, deformation during transportation is reduced, and the performance of protecting the internal structure is improved. When a polyurea protective layer 900 is coated on the surface of at least one of the compressor 50, the liquid receiver 80 and the four-way valve assembly 70, on the one hand, its structural strength can be improved, thereby eliminating the need to increase the wall thickness, saving costs and space, and reducing the probability of damage; on the other hand, it can solve the resonance problem generated during the operation of the air conditioner and reduce the noise impact caused by vibration, thereby improving the transportation safety and service life of the air conditioner.

[0097] Please refer to the reference. Figures 1 to 3 In an optional embodiment, the indoor unit housing 210 includes a face frame 214 and an indoor front panel 212 covering the face frame 214, wherein the inner surface of the indoor front panel 212 facing the face frame 214 is coated with the polyurea protective layer 900.

[0098] In the structure of the indoor unit 200 of the air conditioner, the indoor unit casing 210 plays a role in protecting the internal structure. It requires high structural strength and fatigue resistance. Therefore, in this embodiment, a polyurea protective layer 900 is coated on the indoor unit casing 210 to form a tough, skin-like protective layer. Through the orderly connection and filling of the dotted and linear structures within the material, the indoor unit casing 210 possesses properties such as heat insulation, heat preservation, energy absorption, and deformation resistance, thereby improving structural strength and reducing deformation and noise caused by ambient temperature. Here, the indoor unit 200 of the air conditioner can be a wall-mounted unit or a floor-standing unit.

[0099] Specifically, taking the indoor unit 200 as a wall-mounted unit as an example, the indoor unit casing 210 includes a connected frame 214 and an indoor front panel 212, which together form a cavity to accommodate components. Since a filter is installed on the inside of the indoor front panel 212, the filter needs to be frequently removed for cleaning. The indoor front panel 212 needs to be frequently opened or closed to the frame 214, which can lead to deformation. Therefore, a polyurea protective layer 900 is coated on the surface of the indoor front panel 212. This coating enhances toughness and structural strength, reducing the probability of structural deformation of the indoor front panel 212 during opening or closing. At the same time, the polyurea protective layer 900 can be specifically coated on the inner surface of the indoor front panel 212 facing the frame 214. This saves materials and provides effective isolation, preventing deformation of the indoor front panel 212 due to excessively high surface temperature caused by heat exchange from the indoor heat exchanger 240. This improves the heat deformation resistance and high-temperature resistance of the indoor front panel 212.

[0100] Of course, when the indoor unit 200 is a cabinet unit, the position of the polyurea protective layer 900 coated on its indoor unit casing 210 can be adjusted accordingly.

[0101] Please combine Figure 3 and Figure 4 In an optional embodiment, the interior front panel 212 includes a panel body 2122 and a buckle 2124 disposed on the panel body 2122. The surface of the face frame 214 is provided with a locking hole 2142 that engages with the buckle 2124 for fastening. The outer surface of the buckle 2124 is coated with the polyurea protective layer 900.

[0102] In this embodiment, to facilitate the assembly and disassembly of the interior front panel 212 and the face frame 214, the connection between the two is set as a snap-fit ​​connection 2124. The interior front panel 212 includes a panel body 2122 and a snap-fit ​​hole, and the face frame 214 has a snap-fit ​​hole 2142 on its surface. The snap-fit ​​2124 is inserted into and secured within the snap-fit ​​hole 2142. Since the snap-fit ​​2124 structure is the main load-bearing structure in the opening and closing of the interior front panel 212, a polyurea protective layer 900 is coated on the outer surface of the snap-fit ​​2124. This significantly enhances the structural strength of the snap-fit ​​2124, reduces the snap-fit ​​breakage problem caused by the snap-fit ​​2124 and the snap-fit ​​hole 2142 during securing, and reduces the problem of snap-fit ​​breakage or connection failure during low-speed transportation. At the same time, it can also reduce the design requirements of the snap-fit ​​2124 and the manufacturing difficulty of the mold, thereby simplifying the structure, omitting the reinforcing structure of the snap-fit ​​2124, such as reinforcing ribs, and improving production efficiency. The structure of this clip 2124 can be used to coat the inner surface of the panel body 2122 with a polyurea protective layer 900, thereby improving the overall structural performance of the interior front panel 212.

[0103] In addition, a polyurea protective layer 900 can be applied only locally to the interior front panel 212 near the electrical control box 260 and / or the indoor motor. Here, the indoor motor and electrical control box 260 are generally located on the right side of the air conditioner indoor unit 200. The electrical control box 260 and the indoor motor generate a large amount of heat during operation, and the indoor motor also generates vibration noise. Therefore, applying a polyurea protective layer 900 locally to the corresponding surface of the interior front panel 212 can effectively reduce thermal deformation, absorb vibration noise, prevent noise from radiating outwards from the interior front panel 212, and effectively reduce the vibration generated by the interior front panel 212. Alternatively, the polyurea protective layer 900 can also be applied to the inner surface of the frame 214 and the chassis structure connected to the frame 214.

[0104] Please refer to the reference. Figures 7 to 9 In an optional embodiment, the outdoor unit housing 10 includes an outdoor front panel 11, a top cover 15, a right side panel 13, and a chassis 17 connected together. The outdoor front panel 11, the top cover 15, the right side panel 13, and the chassis 17 enclose a receiving cavity. At least one of the outdoor front panel 11, the top cover 15, the right side panel 13, and the chassis 17 has its corners coated with the polyurea protective layer 900.

[0105] Understandably, since the indoor and outdoor units of an air conditioner are placed outdoors, and the outdoor environment is more severe, the structural strength requirements for the outdoor unit casing 10 are higher. In this embodiment, based on the structure of the indoor unit casing 210 with or without a polyurea protective layer 900, a polyurea protective layer 900 is coated on the surface of the outdoor unit casing 10, thereby giving the outdoor unit casing 10 properties such as heat insulation, heat preservation, energy absorption, and deformation resistance, improving structural strength, and reducing deformation and noise caused by ambient temperature.

[0106] Specifically, the outdoor unit casing 10 is roughly rectangular in shape, including the connected outdoor front panel 11, top cover 15, right side panel 13, and chassis 17, which together form a housing cavity. Since the corners of the outdoor unit casing 10 are prone to strong impacts and severe deformation during drop tests, a polyurea protective layer 900 is applied to each corner of the outdoor front panel 11, top cover 15, right side panel 13, and chassis 17. On the one hand, this provides ultra-tough protection for the corners of the outdoor unit 100's appearance structure, effectively protecting the corner structure of the outdoor unit during drop tests or transportation, reducing the stress deformation of the sheet metal structure, effectively protecting the overall appearance integrity of the unit, and improving product quality. On the other hand, it reduces the use of spraying materials, effectively reducing costs.

[0107] Of course, polyurea protective layer 900 can also be applied separately to the corners of the outdoor front panel 11, top cover 15, right side panel 13 or chassis 17, or to the corners of the combination of two or three of the above structures.

[0108] Please combine Figures 10 to 13 In an optional embodiment, the polyurea protective layer 900 is coated at the joint of any two of the outdoor front panel 11, top cover 15, right side panel 13 and chassis 17 that are connected together.

[0109] And / or, the inner and / or outer surfaces of the chassis 17 are coated with the polyurea protective layer 900;

[0110] And / or, the outer surface of the chassis 17 is provided with feet 175, and the inner and / or outer surfaces of the feet 175 are coated with the polyurea protective layer 900.

[0111] Here, in addition to applying a polyurea-free protective layer 900 to the corners of the outdoor unit housing 10, a polyurea protective layer 900 is also applied to any joints between the outdoor front panel 11, top cover 15, right side panel 13, and chassis 17. Examples include the joints between the top cover 15 and the outdoor front panel 11, the joint between the top cover 15 and the right side panel 13, the joint between the indoor front panel 212 and the chassis 17, and the joint between the right side panel 13 and the chassis 17. Thus, the polyurea protective layer 900 enhances the strength and energy absorption characteristics of the outdoor unit housing 10, effectively mitigating and blocking vibrations caused by the operation of components within the housing cavity, thereby reducing resonance and abnormal noise.

[0112] Of course, in addition to coating any joint of the outdoor front panel 11, top cover 15, right side panel 13, and chassis 17 with a polyurea-free protective layer 900, a polyurea protective layer 900 is also coated on the inner and / or outer surfaces of the chassis 17, i.e., the chassis 17 is sprayed with either a single-sided or double-sided coating. When the outer surface of the chassis 17 is coated with a polyurea protective layer 900, it can protect the outer surface structure of the chassis 17, isolate the intrusion of external moisture, oxygen, and acids and alkalis, improve its resistance to acid and alkali corrosion, and enable the outdoor unit 100 to adapt to acid and alkali environments and harsh ground installation environments, significantly reducing the corrosion rate and extending the product cycle. When the inner surface of the chassis 17 is coated with a polyurea protective layer 900, it can buffer the stress on the chassis 17 and reduce vibration transmission, improving the noise quality of the outdoor unit. When double-sided spraying is performed, all of the above effects can be achieved.

[0113] In addition, feet 175 are provided on the outer surface, i.e., the lower surface, of the chassis 17 to support the chassis 17 and isolate it from the ground. Because they bear the greatest force, in order to improve their structural stability, in addition to the presence or absence of a polyurea protective layer 900 on the surface, corner, or any joint of any of the outdoor front panel 11, top cover 15, right side panel 13, and chassis 17, a polyurea protective layer 900 is coated on the inner and / or outer surfaces of the feet 175. This improves the structural strength and deformation resistance of the feet 175 and ensures their service life.

[0114] Please refer to this again. Figure 10 In an optional embodiment, the outdoor unit housing 10 further includes a partition 16 connected to the chassis 17 to divide the receiving cavity into a fan cavity 10a and a compressor cavity 10b, the cavity wall of the compressor cavity 10b being coated with the polyurea protective layer 900.

[0115] Generally, the indoor unit 200 of the air conditioner also includes a fan assembly located in the outdoor unit casing 10. To prevent interference between the compressor 50 and the fan assembly, a partition 16 is provided in the housing cavity, dividing the housing cavity into a fan cavity 10a and a compressor cavity 10b. The fan assembly is located in the fan cavity 10a, thereby increasing the air volume, and the compressor 50 is located in the compressor cavity 10b. Since the compressor 50 vibrates significantly during operation, in this embodiment, a polyurea protective layer 900 is coated on the cavity wall of the compressor cavity 10b to form a sound insulation layer, improving the energy absorption, noise reduction, and sound insulation characteristics of the compressor cavity 10b wall. This eliminates the need for sound insulation cotton around the compressor 50, significantly increasing the design space for the compressor 50 piping. While improving the noise reduction effect, it also solves the problems of difficult assembly of sound insulation cotton and poor sound insulation performance. Specifically, the partition 16 is connected to the chassis 17, the outdoor front panel 11, and the right side panel 13. The compressor cavity 10b is formed by the top cover 15, the partition 16, the outdoor front panel 11, the chassis 17, and the right side panel 13. Therefore, the surface of the compressor cavity 10b formed by the above components is coated with a polyurea protective layer 900, which can effectively reduce noise radiation.

[0116] Optionally, the thickness D1 of the polyurea protective layer 900 coating on the cavity wall of the compressor cavity 10b ranges from 0.5mm to 5mm. Here, to ensure good sound insulation and energy absorption effects, the D1 of the polyurea protective layer 900 coating on the cavity wall of the compressor cavity 10b should not be too small, nor too large, otherwise it would increase material costs. Here, setting D1 to 0.5mm to 5mm, for example, 0.5mm, 1mm, 2mm, 3mm, 4mm, etc., saves materials while improving sound insulation performance.

[0117] In addition to the compressor 50, the compressor cavity 10b also contains a four-way valve assembly 70 and a liquid receiver 80 connected to the compressor 50. After the polyurea protective layer 900 is applied, the sound insulation cotton inside the compressor cavity 10b is removed, thereby increasing the distance between the four-way valve assembly 70 and the cavity wall of the compressor cavity 10b. For example, the distance between the four-way valve assembly 70 and the partition plate 16 is generally between 30mm and 50mm. Because the distance between them is increased due to the protection of the coating, the partition plate 16 can move towards the compressor 50, thereby increasing the space of the fan cavity 10a and improving the heat exchange efficiency within the fan cavity 10a. At the same time, the minimum distance between the four-way valve assembly 70 and the front panel is between 20mm and 60mm. Because the coating also increases the distance between them, the possibility of the four-way valve assembly 70 accidentally impacting the outdoor front panel 11 when dropped is reduced, thereby improving the performance of the pipeline. Furthermore, since the distance between the four-way valve assembly 70 and the wall behind the middle partition 16 ranges from 15mm to 40mm, and the distance between the four-way valve assembly 70 and the right partition 13 generally ranges from 15mm to 45mm, the installation of the polyurea protective layer 900 eliminates the need for sound insulation cotton, thereby increasing the distance between the four-way valve assembly 70 and both the middle partition 16 and the right partition 13. This reduces the probability of contact between the four-way valve assembly 70 and the middle partition 16 and the right partition 13 due to deformation, thus reducing noise generation.

[0118] Please refer to the reference. Figure 13 and Figure 14 In an optional embodiment, the chassis 17 includes a compression chamber 171 and a fan chamber 173. The compression chamber 171 is provided with a connecting post 1711 that is connected to the compressor 50. The surface of the connecting post 1711 is coated with the polyurea protective layer 900.

[0119] Understandably, to facilitate the connection of the compressor 50, a connecting post 1711 protrudes from the compression chamber 171 of the chassis 17. This connecting post 1711 mates with the hole at the bottom of the compressor 50 to achieve connection. In this embodiment, to further enhance the connection stability of the compressor 50, the surface of the connecting post 1711 is coated with a polyurea protective layer 900, with or without the polyurea protective layer 900. This strengthens the structure of the chassis 17, improves the stability of its connection with the compressor 50, and significantly reduces the problem of uneven stress and skewing deformation caused by the compressor 50 tilting and colliding with the chassis 17 and connecting post 1711 when the whole machine is dropped. It also reduces the radiation of compressor 50 noise towards the chassis 17. Specifically, the connecting post 1711 and the compression chamber 171 are integrally formed, further enhancing the structural strength.

[0120] Please combine Figure 15 and Figure 16In an optional embodiment, the outdoor unit 100 of the air conditioner further includes a compressor base frame 51, the compressor 50 is fixed on the compressor base frame 51, the compressor base frame 51 has a mounting hole 511, a foot pad 53 is provided between the compressor base frame 51 and the connecting column 1711, the foot pad 53 is sleeved on the connecting column 1711 and partially passes through the mounting hole 511, the fastener locks the connecting column 1711 and abuts against the compressor base frame 51, and at least a portion of the outer surface of the foot pad 53 is coated with the polyurea protective layer 900.

[0121] Understandably, the compressor 50, as an important functional component of the outdoor unit 100 of the air conditioner, is equipped with a compressor base 51 for easy connection to the connecting column 1711, allowing the compressor 50 to be fixed on the compressor base 51. To mitigate the impact of drops, rubber pads 53 are usually added between the compressor base 51 and the connecting column 1711. The pads 53 absorb and release deformation, improving the cushioning effect and reducing vibration transmission. In this embodiment, the compressor base 51 has a mounting hole 511. The pads 53 are fitted onto the connecting column 1711 and partially pass through the mounting hole 511. The connecting column 1711 also extends out of the mounting hole 511. Then, a locking fastener, such as a lock nut, is used to lock it onto the compressor base 51. Here, since the foot pad 53 is made of rubber, it is prone to deformation. Therefore, at least part of the outer surface of the foot pad 53 is coated with a polyurea protective layer 900. On the one hand, this can effectively improve the strength and impact resistance of the foot pad 53, so that the more flexible foot pad 53 can provide reverse support during drop transportation, reducing the structural deformation caused by the impact of the foot 175 on the chassis 17 and the deformation caused by the compressor 50 hitting the chassis 17. On the other hand, it also makes the foot pad 53 have strong flexibility and energy absorption characteristics, reducing the vibration transmission of the compressor 50, and can also play a certain protective role for the foot pad 53 in harsh environments, reducing the risk of aging and failure, and extending its service life.

[0122] Please refer to this again. Figure 15 and Figure 16 In an optional embodiment, the foot pad 53 includes a base portion and a throat portion protruding from the middle of the base portion. The end face of the base portion facing the throat portion is a first platform, and the end face of the throat portion is a second platform. The polyurea protective layer 900 is disposed on the outer surface of the base portion or on the circumferential surface of the base portion.

[0123] And / or, the foot pad 53 has a through foot pad hole 531, and the inner wall of the foot pad hole 531 is coated with the polyurea protective layer 900;

[0124] And / or, the surface of the compressor base 51 facing the chassis 17 is coated with the polyurea protective layer 900.

[0125] In this embodiment, to improve structural strength and save materials, a polyurea protective layer 900 is coated only on the outer surface of the base portion of the foot pad 53, excluding the second platform. This allows the compressor base frame 51 to directly contact the second platform, reducing circumferential vibration transmission. Here, the base portion can have a larger central hole, suitable for applications where the compressor 50 is relatively light and the vertical vibration damping effect of the foot pad 53 is strong; alternatively, a smaller central hole can be used, suitable for applications where circumferential vibration damping requirements are not high, the compressor 50 is relatively light, and good vertical vibration damping is required. Alternatively, a polyurea protective layer 900 can be coated on the circumferential surface of the base portion, including the second platform. In this case, the foot pad 53 has strong strength and impact resistance, and a larger central hole is provided at the bottom, primarily used in applications where circumferential vibration transmission is reduced, the compressor 50 is relatively heavy, and drop deformation is significant.

[0126] Based on the presence or absence of a polyurea protective layer 900 on the outer periphery of the base, a polyurea protective layer 900 is coated on the inner wall of the foot pad hole 531 opened in the foot pad 53. On the one hand, this provides structural strength support for the interior of the foot pad 53, ensuring strong vibration reduction and isolation performance while maintaining strong impact resistance. On the other hand, it can also reduce the friction between the connecting column 1711 and the foot pad 53 during the operation of the compressor 50, thereby improving the performance of the foot pad 53 and preventing the risk of performance failure.

[0127] Furthermore, the polyurea protective layer 900 applied to the foot pad 53 significantly improves its structural strength, allowing the Shore hardness of the foot pad 53 to be optimized from 40HS to 30HS during processing, thereby reducing processing difficulty and improving efficiency. Optionally, the coating thickness inside the holes of the foot pad 53 is 1.5mm, and tests have shown a significant reduction in piping vibration, especially in compressors operating at frequencies above 40Hz, effectively reducing vibration transmission and noise radiation.

[0128] Optionally, based on the foot pads 53 with or without a polyurea protective layer 900, the surface of the compressor 50 can be coated with a polyurea protective layer 900. On the one hand, the polyurea protective layer 900 possesses damping properties, reducing the outward transmission and buffering of tangential vibrations during compressor 50 operation, thereby reducing the probability of drop deformation and achieving vibration reduction and noise reduction. On the other hand, due to the coating's ultra-toughness, the cylinder wall thickness of the compressor 50 can be reduced, decreasing the weight of the compressor 50, making it lighter and saving material and transportation costs. Simultaneously, because the polyurea protective layer 900 has thermal insulation and sound insulation properties, it can significantly reduce heat loss and noise radiation from the compressor 50 surface, improving the air conditioner's heating capacity and operating noise.

[0129] Meanwhile, a polyurea protective layer 900 is coated on the surface of the compressor base 51 facing the chassis 17, enhancing the structural strength of the compressor base 51 and reducing the probability of deformation caused by the compressor 50 impacting the chassis 17 during its descent. The polyurea protective layer 900 between the compressor base 51 and the foot pads 53 provides secondary cushioning and vibration reduction, further reducing the transmission of vibration from the compressor 50 to the chassis 17 during operation. Specifically, the compressor base 51 is triangular in shape, with mounting holes 511 at the three corners of the triangle, providing a stable connection structure with the chassis 17. Alternatively, the polyurea protective layer 900 can be applied to the lower surface of the compressor base 51 even if the foot pads 53 or the compressor 50 are not coated with it.

[0130] Please refer to Figure 17 In an optional embodiment, the thickness D2 of the polyurea protective layer 900 coated on the outer surface of the compressor 50 ranges from 0.25 mm to 50 mm;

[0131] And / or, the thickness D3 of the polyurea protective layer 900 coated on the outer surface of the liquid storage tank 80 is 0.25mm to 60mm;

[0132] And / or, the compressor 50 is connected to the liquid storage tank 80 via a connecting pipe 81, and the outer peripheral surface of the connecting pipe 81 is coated with the polyurea protective layer 900.

[0133] In this embodiment, when a polyurea protective layer 900 is coated on the outer surface of the compressor 50, the thickness of the polyurea protective layer 900 should not be too small, otherwise it will not provide good sound insulation and noise reduction. However, it should not be too large, otherwise the performance improvement will be limited, but the processing technology and cost will increase significantly. Therefore, the thickness range of the polyurea protective layer 900 on the surface of the compressor 50 is set to 0.25mm to 50mm, for example, 3mm, 4mm, 5mm, 10mm, etc. Optionally, a coating thickness of 3mm provides good protective performance and saves material costs.

[0134] While the compressor 50 is coated with or without a polyurea protective layer 900, the outer surface of the liquid receiver 80 is also coated with a polyurea protective layer 900. This structure can reduce the tangential vibration transmission of the liquid receiver 80. By adjusting the coating thickness, the thickness of the liquid receiver 80 can be changed, thereby adjusting its natural frequency to avoid resonance. At the same time, it can reduce the noise radiation of the liquid receiver 80 and reduce the fluid noise caused by the internal refrigerant impact, improving the overall sound quality of the outdoor unit 100 of the air conditioner. Here, in order to ensure the modification effect of the liquid receiver 80, the thickness of the polyurea protective layer 900 coated on its surface ranges from 0.25mm to 60mm, for example, 0.25mm, 1mm, 2mm, 3mm, 5mm, 10mm, etc. Among them, the optional coating thickness of 3mm can ensure the vibration reduction and noise reduction performance of the liquid receiver 80 while also saving material costs.

[0135] Furthermore, a connecting pipe 81 connects the liquid receiver 80 and the compressor 50, and this connecting pipe 81 is welded to both the compressor 50 and the liquid receiver 80. Here, in addition to coating the surface of the compressor 50 and / or the liquid receiver 80 with a polyurea protective layer 900, the surface of the connecting pipe 81 is also coated with a polyurea protective layer 900. This reduces stress concentration caused by overheating or underheating of the connecting pipe 81 during welding, and also reduces stress concentration caused by the relative movement between the compressor 50 and the liquid receiver 80 during operation. This improves their fatigue life and prevents refrigerant leakage, ensuring the performance of the outdoor unit 100 of the air conditioner.

[0136] Optionally, when applying the polyurea protective layer 900, one half of the surfaces of the compressor 50, connecting pipe 81, and liquid storage tank 80 can be continuously coated, and then the other half of the surfaces of the compressor 50, connecting pipe 81, and liquid storage tank 80 can be continuously coated to improve coating efficiency and also make the resulting polyurea protective layer 900 have higher structural strength.

[0137] Please refer to the reference. Figures 20 to 24 In an optional embodiment, the four-way valve assembly 70 includes a four-way valve 71 and four outlets of the four-way valve 71, including an exhaust pipe 72, a return pipe 73, a low-pressure valve assembly 74, and a valve cooling pipe 75. The exhaust pipe 72 is connected to the exhaust port 59 of the compressor 50, the return pipe 73 is connected to the return port 83 of the liquid storage tank 80, the low-pressure valve assembly 74 is connected to the indoor heat exchanger 240, and the valve cooling pipe 75 is connected to the outdoor heat exchanger 60. At least one of the exhaust pipe 72, the return pipe 73, the low-pressure valve assembly 74, the valve cooling pipe 75, and the four-way valve 71 has its outer surface coated with the polyurea protective layer 900.

[0138] Understandably, the four-way valve assembly 70 plays a crucial role in the switching between cooling and heating, connecting the compressor 50, outdoor heat exchanger 60, and indoor heat exchanger 240 to achieve heat exchange. The four-way valve assembly 70 includes a four-way valve 71, an exhaust pipe 72, a return pipe 73, a low-pressure valve assembly 74, and a valve cooling pipe 75. The four-way valve 71 has four outlets, which are respectively connected to the exhaust pipe 72, the return pipe 73, the low-pressure valve assembly 74, and the valve cooling pipe 75. The other end of the exhaust pipe 72 is connected to the exhaust port 59 of the compressor 50 to discharge high-temperature and high-pressure gas. The return pipe 73 is connected to the return port 83 of the liquid receiver 80. The valve cooling pipe 75 is connected to the outdoor heat exchanger 60. The low-pressure valve assembly 74 is connected to the indoor heat exchanger 240 through a valve plate 76 fixed on the right side panel 13. The above connection relationships are all existing connection methods, so they will not be described in detail.

[0139] Due to the special nature of the pipe structure, resonance or poor impact resistance may occur. Therefore, in this embodiment, at least one of the four-way valve 71, exhaust pipe 72, return pipe 73, low-pressure valve assembly 74, and valve cooling pipe 75 can be coated with a polyurea protective layer 900. Optionally, the outer surfaces of the four-way valve 71, exhaust pipe 72, return pipe 73, low-pressure valve assembly 74, and valve cooling pipe 75 can all be coated with the polyurea protective layer 900 and sprayed evenly to form a protective layer. On the one hand, the natural frequency of the pipeline can be changed by altering the coating thickness, avoiding resonance between the pipeline and the excitation frequency of the compressor 50, thus improving pipeline reliability. On the other hand, the coating provides insulation and protection for the pipeline, reducing heat exchange between the refrigerant and the outside environment through the pipeline, improving the overall heat exchange efficiency, and enhancing the pipeline's acid and alkali resistance. Furthermore, it reduces the risk of refrigerant leakage caused by localized stress concentration and fatigue due to improper welding positions, and improves impact resistance. This allows for a reduction in pipe wall thickness, thus reducing material costs, and also eliminates the need for insulation cotton and silencers, thereby improving assembly efficiency.

[0140] Of course, in other embodiments, the polyurea protective layer 900 may be applied to only one of the exhaust pipe 72, return pipe 73, low-pressure valve assembly 74, valve cooling pipe 75, and four-way valve 71. For example, by spraying a polyurea protective coating onto the low-pressure valve assembly 74, the application of black protective paint can be eliminated, thereby improving the corrosion resistance of the low-pressure valve assembly 74 while also enhancing the steel pipe's resistance to refrigerant impact and internal pressure. In other embodiments, the polyurea protective layer 900 may be applied to the surface of any combination of two, three, or four of the above structures.

[0141] Understandably, when coating the surface of the above-mentioned pipeline with polyurea protective layer 900, the coating thickness should not be too large or too small. The coating thickness D4 of the polyurea protective layer 900 coated in the exhaust pipe 72, return pipe 73, low-pressure valve assembly 74, valve cooling pipe 75 and four-way valve 71 is in the range of 0.5mm to 3.5mm, for example, 0.5mm, 1mm, 2mm, 3mm, etc., so as to ensure the modification effect and save material costs.

[0142] Please refer to this again. Figure 21 In an optional embodiment, the periphery of the connection position between the exhaust pipe 72 and the exhaust port 59 of the compressor 50 is coated with a polyurea weld protection layer 902.

[0143] Furthermore, the periphery of the connection position between the return gas pipe 73 and the return gas port 83 of the liquid storage tank 80 is coated with the polyurea weld protection layer 902.

[0144] In this embodiment, since the exhaust pipe 72 and the exhaust port 59 of the compressor 50 are connected by welding, in order to ensure the connection strength and sealing of the two, a polyurea weld protection layer 902 is coated around the connection position of the exhaust pipe 72 and the exhaust port 59. Similarly, a polyurea weld protection layer 902 is coated around the connection position of the return pipe 73 and the return port 83. The polyurea weld protection layer 902 here has the same material composition and the same effect as the polyurea protection layer 900 mentioned above. In this way, through the strong toughness and adhesion of the coating, the weld joint is effectively covered, reducing the stress concentration and fatigue caused by overheating and underheating of the weld joint, improving the service life of the weld joint position, and reducing the risk of refrigerant leakage.

[0145] In an optional embodiment, the polyurea weld protection layer 902 covers the exhaust pipe 72 at a height of H1, where H1 ranges from 20mm to 35mm.

[0146] And / or, the polyurea weld protection layer 902 covers the return air pipe 73 at a height of H2, where H2 ranges from 35mm to 40mm.

[0147] In this embodiment, in order to maintain a good protective effect, the extension height of the polyurea weld protection layer 902 of the exhaust pipe 72 and the exhaust port 59 along the pipeline axis should not be too small. Of course, to save costs, the extension height of the coating should not be too large either. Here, the range of H1 is set to 20mm to 35mm, for example, 20mm, 25mm, 30mm, 35mm, etc., thereby effectively improving the protective performance and saving material costs.

[0148] Similarly, in order to better protect the weld joint of the return gas pipe 73 and the return gas port 83 and save costs, the coverage height of the polyurea weld protection layer 902 on the return gas pipe 73 should not be too large or too small. Here, the range of H2 is set to 35mm to 40mm, for example, 35mm, 37mm, 38mm, 40mm, etc., so as to ensure a good protective effect.

[0149] Please refer to Figure 23 In an optional embodiment, a polyurea pipe interconnect coating 903 is formed between the pipe segments parallel to the exhaust pipe 72 and the return pipe 73.

[0150] And / or, the portion of the exhaust pipe 72 near the chassis 17 is coated with a polyurea counterweight coating 904.

[0151] In this embodiment, based on the polyurea protective layer 900 coated on the surface of the exhaust pipe 72 and / or the return pipe 73, in order to achieve pipe interconnection, a polyurea pipe interconnection coating 903 is sprayed on the pipe section of the return pipe 73 parallel to the exhaust pipe 72. The cured polyurea pipe interconnection coating can increase the pipe damping characteristics, thereby reducing pipe vibration. At the same time, it can also solve the problem of pipe collision and pipe breakage caused by excessive pipe deformation during the drop transportation of the whole machine.

[0152] Here, the polyurea pipe interconnect coating 903 can be processed by supporting the coating with a pad, then removing the pad. The height of the polyurea pipe interconnect coating 903 in the pipe extension direction should not be too large, otherwise it will significantly affect the pipe's weight. Of course, the height should also not be too small, otherwise the interconnection effect will be ineffective. Therefore, the height of the polyurea pipe interconnect coating 903 in the pipe extension direction is set to 30mm–60mm, for example, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, etc., thus ensuring the pipe interconnection effect, saving material costs, and not affecting the pipe's weight.

[0153] Based on the existing and non-existent polyurea pipe interconnection coating 903, local spraying is performed on the aforementioned pipes to form a polyurea counterweight coating 904. For example, the polyurea counterweight coating 904 is applied to the part of the exhaust pipe 72 near the chassis 17 to achieve a pipe damping effect. On the one hand, it replaces the previous counterweights and anti-vibration adhesives, reducing the assembly process of counterweights and anti-vibration adhesives on the pipes and solving the problems of low assembly efficiency and poor counterweight anti-vibration effect; on the other hand, it can also reduce the pipe vibration response and improve the noise reduction effect. Of course, the polyurea counterweight coating 904 can also be applied to other pipes, such as the return pipe 73 or the valve cooling pipe 75.

[0154] Here, the thickness of the polyurea counterweight coating 904 can be selected from 2mm to 5mm, for example, 2mm, 3mm, 4mm, 5mm, etc., to achieve a better counterweight effect and save material costs. Similarly, the height of the polyurea counterweight coating 904 in the extension direction of the pipe can range from 20mm to 60mm, for example, 20mm, 30mm, 40mm, 50mm, etc., to improve the counterweight effect and save material costs.

[0155] Furthermore, experiments showed that when spraying a polyurea protective layer 900 onto pipes of the same diameter, the pipe's internal pressure resistance increased with increasing coating thickness. However, when different pipes were coated with the same thickness, smaller pipe diameters exhibited better pressure resistance after coating.

[0156] Please refer to Figure 25 and Figure 26 In an optional embodiment, the outdoor unit housing 10 further includes a large handle structure 12, which is connected to the outer surface of the right side panel 13, and the inner and / or outer surfaces of the large handle structure 12 are coated with a polyurea fireproof layer 901.

[0157] Understandably, the large handle structure 12 is used for hand-held transport of the outdoor unit 100 of the air conditioner. It is located on the outer surface of the right side panel 13 and also serves to block the wiring terminals 40 located on the right side panel 13. Therefore, in this embodiment, coating the inner surface of the large handle with a polyurea fire-retardant layer 901 can eliminate the need for the original fire-retardant sheet metal on the inner side of the large handle structure 12, increase the internal space of the outdoor unit casing 10, and improve assembly efficiency. At the same time, it effectively avoids the combustion problem caused by arcing of the wiring terminals 40 due to the start and stop of the outdoor unit 100 of the air conditioner. It can also play a certain role in heat insulation, reduce the deformation of the large handle structure 12 caused by terminal arcing, and isolate the vibration and noise radiation of the compressor 50.

[0158] Here, the polyurea fire-retardant coating can be applied to the inner surface of the large handle structure 12, or to the outer surface, or to both the inner and outer surfaces.

[0159] Of course, to ensure the fire-retardant effect of the coating, it is preferable to coat it on the inner surface of the large handle structure 12. Here, the inner surface of the large handle structure 12 has an outwardly recessed groove structure. When applying the polyurea fire-retardant coating within this groove structure, the depth of the recessed structure of the polyurea protective layer 900 is set to the depth of the groove structure plus 2mm, thereby increasing the effective coverage area of ​​the inner fire-retardant coating on the large handle structure 12 and improving fire-retardant reliability. When the coating is located on the outer surface of the large handle structure 12, the large handle structure 12 has an outwardly protruding structure. The depth of the polyurea fire-retardant coating is set to the height of the protruding structure plus 1mm, thereby increasing the protection of the large handle structure 12, improving its appearance, and covering and surrounding the large handle structure 12.

[0160] In an optional embodiment, the compressor 50 is further provided with a compressor terminal 57 at its end, and a compressor terminal cover 55 covering the compressor terminal 57 is connected to the end of the compressor 50. The inner surface of the compressor terminal cover 55 is coated with a polyurea fireproof layer 901.

[0161] And / or, the air conditioner indoor unit 200 also includes an electrical control box 260 disposed in the indoor unit housing 210, the electrical control box 260 having multiple terminals, and the inner and / or outer surfaces of the electrical control box 260 being coated with a polyurea fire-retardant layer 901.

[0162] Please combine Figure 18 and Figure 19 Understandably, in order to control the compressor 50, a compressor terminal 57 is provided on the top of the compressor 50, and a compressor terminal cover 55 is connected to the end of the compressor 50 to cover the compressor terminal 57, thereby effectively blocking sparks and arcs caused by arcing of the compressor terminal 57 during the start-up and shutdown of the compressor 50. Specifically, the compressor terminal cover 55 can be fixed to the top of the compressor 50 by threads. In this embodiment, a polyurea fireproof layer 901 is coated on the inner surface of the compressor terminal cover 55. On the one hand, this reduces the cost increase caused by using fireproof materials for the compressor terminal cover 55 and solves the reliability problem of fireproof materials and the resulting high temperature and combustion problems; on the other hand, it reduces the thickness of the compressor terminal cover 55, reduces its material cost, and improves its fireproof performance.

[0163] Here, the relationship between the reduced thickness of the compressor terminal cover 55 and the thickness of the polyurea fire-retardant coating should satisfy the following: the reduced thickness is equal to the thickness of the polyurea fire-retardant layer 901 plus a dimension of 0.5 mm to 1 mm. Of course, in other embodiments, the polyurea fire-retardant coating can also be applied to the outer surface of the compressor terminal cover 55, or the polyurea fire-retardant coating can be applied to both the inner and outer surfaces of the compressor terminal cover 55.

[0164] Please combine Figure 5 and Figure 6Of course, the electrical control box 260 in the indoor unit 200 of the air conditioner also has multiple terminals for connecting to the power lines of other components. Therefore, to improve fire resistance, a polyurea fire-retardant layer 901 is coated on the inner and / or outer surfaces of the electrical control box 260. Specifically, the electrical control box 260 includes a cover, a bottom, and side panels, which together form a cavity to accommodate electrical components, thus facilitating assembly. Here, the outer surface of the electrical control box 260 is coated with a polyurea fire-retardant layer 901, that is, the outer surfaces of the cover, side panels, and bottom are coated with the polyurea fire-retardant layer 901. This structure can significantly improve the fire resistance of the electrical control box 260, effectively isolating terminal arcing and electric arcs caused by the power on and off of various functional modules, thereby eliminating the need for the original fire-retardant sheet metal. This solves the problems of large size and difficulty in installation caused by adding fire-retardant sheet metal to the electrical control box 260, improving assembly efficiency; at the same time, it can also isolate heat radiation and reduce the heat deformation and failure of surrounding plastic parts.

[0165] Please refer to Figure 25 , Figures 27 to 29 In an optional embodiment, the air conditioner further includes two fan structures, one of which is located in the indoor unit of the air conditioner and the other is located in the outdoor unit of the air conditioner. The fan structure 30 includes a hub (31a, 31b) and a plurality of blades (33a, 33b). The plurality of blades (33a, 33b) are spaced apart on the circumferential surface of the hub (31a, 31b). Each blade (33a, 33b) has a first surface 33a1 and a second surface 33a3 opposite to each other.

[0166] The first surface 33a1 and / or the second surface 33a3 of the blade (33a, 33b) are covered with the polyurea protective layer 900.

[0167] The fan structure, located in the outdoor or indoor unit of an air conditioner, is used to drive airflow for heat exchange. In this embodiment, the fan structure 30 can be an axial flow fan 30a, a cross-flow fan, or a centrifugal fan 30b, etc., and is not limited thereto. The fan structure 30 generally includes a rotor and a drive component connected to the rotor. The rotor includes a hub (31a, 31b) and multiple blades (33a, 33b) disposed around the periphery of the hub (31a, 31b). The drive component is connected to the hub (31a, 31b), thereby driving the blades (33a, 33b) to rotate under the drive of the drive component, thus achieving airflow drive. Here, setting the hub (31a, 31b) and the blades (33a, 33b) as an integrally formed structure can significantly improve the connection strength between the blades (33a, 33b) and the hub (31a, 31b), enhance the overall structural stability of the rotor, prevent cracks and breakage at the connection, and save processing steps, thereby improving production efficiency. Optionally, the hub (31a, 31b) and blades (33a, 33b) are both made of plastic and are formed by plastic injection molding, resulting in a lightweight and stable structure; or both are made of metal and are formed by injection molding or powder metallurgy, resulting in good heat resistance. No limitation is made here.

[0168] The fan structure 30 of the present invention includes a hub (31a, 31b) and multiple blades (33a, 33b) disposed around the hub (31a, 31b). At least one of the two surfaces of each blade (33a, 33b) is coated with a polyurea protective layer. Since polyurea material has good tensile strength, flexibility, aging resistance, and wear resistance, the polyurea protective layer formed by the orderly connection and filling of the dot-like or linear structure inside the material, layer by layer, has energy absorption, damping and noise reduction, impact resistance and high temperature resistance, effectively improving the high temperature resistance of the blades (33a, 33b), thereby reducing the impact of high temperature airflow on the blades (33a, 33b) during heat exchange and reducing thermal deformation; and improving the overall strength of the blades (33a, 33b), with high deformation resistance, ensuring the heat exchange air volume of the fan structure 30. Meanwhile, since the polyurea protective layer 900 is an elastic material, it can form a soft contact with the airflow directly, which can reduce the operating noise of the blades (33a, 33b) during rotation.

[0169] In an optional embodiment, the blades (33a, 33b) are made of polypropylene.

[0170] In this embodiment, the structural strength of the blades (33a, 33b) is significantly enhanced due to the coating of the polyurea protective layer 900. Here, the material of the blades (33a, 33b) can be changed from the original mixture of acrylonitrile butadiene styrene plastic (ABS plastic) and glass fiber material to polypropylene material (PP). Although the former material has high strength, it is also more expensive, while the latter material has a lower cost. In this way, the strength of the polyurea protective layer 900 can make up for the difference, and the material of the blades (33a, 33b) can be replaced, thereby effectively reducing the processing cost of the wind turbine structure 30.

[0171] Please combine Figure 7 and Figure 8 Overall, in optional embodiments, the thickness D5 of the polyurea protective layer 900 ranges from 0.5 mm to 3 mm.

[0172] In this embodiment, to enhance the strength of the fan structure 30 and improve its resistance to deformation, the thickness of the polyurea protective layer 900 should not be too small; conversely, the thickness of the polyurea protective layer 900 should not be too large either, otherwise the thicker blades (33a, 33b) will increase the total thickness of the impeller, resulting in a loss of airflow. Therefore, to ensure improved structural strength while minimizing the impact on airflow, the thickness of the polyurea protective layer 900 is set to 0.5mm to 3mm, for example, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0173] Please continue to refer to Figures 27 to 29 In the first embodiment of the fan structure 30, the fan structure 30 is an axial flow fan 30a.

[0174] In this embodiment, the fan structure 30 is an axial flow fan 30a, which has axial air intake and axial air outlet. Here, the axial flow fan 30a includes a hub 31a and blades 33a. The blades 33a are arranged around the outer periphery of the hub 31a, and the number of blades 33a is typically three or more. The size of the blades 33a is relatively large compared to the size of the hub 31a. Therefore, coating the blades 33a with a polyurea protective layer 900 can significantly improve the deformation resistance of the blades 33a. Specifically, there are three blades 33a, and the width of the blades 33a increases from the root to the edge, thereby increasing the air volume delivered by the fan structure 30. Furthermore, the surface where the root of each blade 33a is located is angled relative to the surface where the end face of the hub 31a is located, which can reduce the noise generated by the impeller and also improve the efficiency of the fan structure 30.

[0175] Please refer to Figures 31 to 33 In an optional embodiment, the first surface 33a1 of the blade 33a faces the air inlet side of the fan structure 30, the second surface 33a3 of the blade 33a faces the air outlet side of the fan structure 30, and the outer edge surface of the polyurea protective layer 900 covering the second surface 33a3 is set at an angle α with the outer edge surface of the blade 33a, wherein the angle α ranges from 2° to 8°.

[0176] As can be seen, when the fan structure 30 is an axial flow fan 30a, its air inlet and outlet are both along the axial direction of the hub 31a. The surface of the blade 33a facing the air inlet side is designated as the first surface 33a1, i.e., the suction surface, and the surface facing the air outlet side is designated as the second surface 33a3, i.e., the pressure surface. In order to effectively improve the airflow detachment at the outer edge of the blade 33a, the outer edge surface of the polyurea protective layer 900 covering the second surface 33a3 is set at an angle α with the edge surface of the blade 33a. That is, the edge of the polyurea protective layer 900 covering the pressure surface is inclined. In other words, from the root to the edge of the blade 33a, the polyurea protective layer 900 gradually approaches and tilts towards the first surface 33a1, thereby further increasing the bending angle of the edge of the blade 33a. This makes it easier for the airflow to detach at the edge, thereby reducing friction with the airflow and reducing the noise generated by the fan structure 30.

[0177] Of course, the included angle α should not be too large, otherwise the thickness of the polyurea protective layer 900 will be too small, resulting in reduced strength at the edges, making it prone to wear and damage, and generating more noise due to friction with the airflow. The included angle α should also not be too small, otherwise it will not effectively increase the rate of airflow shedding. Therefore, the included angle α is set in the range of 2° to 8°, for example, 2°, 3°, 4°, 5°, 6°, 7°, 8°, etc., thereby increasing the airflow shedding rate while ensuring the wear resistance of the blades 33a and reducing the noise generated during the operation of the fan structure 30.

[0178] Please refer to Figure 31 In an optional embodiment, in the edge direction from the hub 31a to the blade 33a, the width of the outer edge surface of the polyurea protective layer 900 covering the second surface 33a3 is set to L, where the value of L ranges from 3mm to 7mm.

[0179] In this embodiment, to ensure that the airflow can completely detach from the inclined portion of the polyurea protective layer 900, the width of the inclined portion covering the outer edge of the polyurea protective layer 900 on the second surface 33a3 is set to L in the direction from the edge of the hub 31a to the edge of the blade 33a. The value of this width L should not be too small, otherwise it will not improve the efficiency of airflow detachment; of course, the value of the width L should not be too large either, otherwise it will increase the thickness of the polyurea protective layer 900, affecting the air volume, or if the thickness is not increased, the included angle α will be too small, which will not ensure that the airflow detaches quickly. Therefore, the value of L is set to be in the range of 3mm to 7mm, for example, 3mm, 4mm, 5mm, 6mm or 7mm, so that the airflow can quickly detach at the edge of the polyurea protective layer 900, effectively reducing the vortex swirling, and thus achieving the function of noise reduction.

[0180] Please combine Figures 28 to 30 In an optional embodiment, the fan structure 30 further includes a motor 37a and a locking member 39a. The hub 31a is mounted on the drive shaft 37a1 of the motor 37a. The free end of the drive shaft 37a1 extends out of the end face of the hub 31a. The end face of the hub 31a facing away from the motor 37a is coated with a polyurea damping layer 905. The locking member 39a is mounted on the free end of the drive shaft 37a1 and abuts against the polyurea damping layer 905.

[0181] As described above, the fan structure 30 also includes a motor 37a, which can be a stepper motor or a motor, etc. The drive shaft 37a1 of the motor 37a is connected to the hub 31a, thereby driving the hub 31a to rotate the blades 33a and drive the airflow for heat exchange. Specifically, a mounting hole is provided in the center of the hub 31a, which matches the diameter of the drive shaft 37a1, allowing the drive shaft 37a1 to pass through the mounting hole. To limit the movement of the hub 31a in its axial direction, the fan structure 30 also includes a locking member 39a. The drive shaft 37a1 extends out of the end face of the hub 31a, and the locking member 39a is locked to the free end of the drive shaft 37a1, thereby preventing the hub 31a from detaching from the drive shaft 37a1. The locking member 39a can be a nut or a pin.

[0182] Here, a polyurea damping layer 905 is coated on the end face of the hub 31a facing away from the motor 37a. The material of the polyurea damping layer 905 is the same as that of the polyurea protective layer 900, which can improve the structural strength and high-temperature resistance of the hub 31a. At the same time, a groove is formed on the end face of the hub 31a, and the mounting hole is formed at the bottom of the groove. The locking member 39a passes through the drive shaft 37a1 and abuts against the bottom wall and the peripheral wall of the groove. Thus, when the polyurea damping layer 905 is coated on the entire end face of the hub 31a, the locking member 39a abuts against the polyurea damping layer 905. On the one hand, it can isolate the vibration transmission between the motor 37a and the hub 31a and reduce the abnormal noise caused by the vibration of the motor 37a transmitted to the wind turbine. On the other hand, the mass of the hub 31a can be adjusted by coating the polyurea damping layer 905, thereby reducing the natural frequency of the wind turbine and avoiding the risk of resonance between the natural frequency of the wind turbine and the motor 37a.

[0183] In an optional embodiment, the thickness D6 of the polyurea damping layer 905 is 3mm to 6mm.

[0184] Here, the thickness of the polyurea damping layer 905 affects the mass of the hub 31a, which in turn affects the natural frequency of the wind turbine. Therefore, the thickness D6 of the polyurea damping layer 905 should not be too small; otherwise, its flexibility will be poor, failing to effectively isolate the vibration of the motor 37a and easily causing resonance with the motor 37a, generating significant noise. Conversely, the thickness D6 of the polyurea damping layer 905 should not be too large either; otherwise, it will excessively increase the mass of the hub 31a or the wind turbine, increasing shaft power. Therefore, setting the thickness D6 of the polyurea damping layer 905 to 3mm to 6mm, such as 3mm, 4mm, 5mm, or 6mm, effectively reduces the transmission of vibration from the motor 37a, reduces resonance, and thus reduces noise.

[0185] In an optional embodiment, the surface of the polyurea protective layer 900 is provided with a plurality of irregularly shaped portions (not shown) arranged in a matrix.

[0186] Understandably, when blade 33a comes into contact with the airflow, it generates significant noise due to the hard friction with the surface of blade 33a. In this embodiment, both the first surface 33a1 and the second surface 33a3 of blade 33a are coated with a polyurea protective layer 900. This coating not only enhances the structural strength and wear resistance of blade 33a, but also alters the surface roughness of blade 33a. Here, multiple concave-convex structures are provided in the two polyurea protective layers 900. These structures can be grooves and / or protrusions, and their shapes can be strip-shaped or block-shaped. These structures can absorb energy and reduce noise radiation, and also mitigate the noise caused by the breaking up of airflow vortices, further achieving a noise reduction effect.

[0187] Please combine Figures 34 to 36In an optional embodiment, the fan structure 30 is a centrifugal fan 30b.

[0188] Here, the fan structure 30 is a centrifugal fan 30b. It is known that the centrifugal fan 30b has axial air intake and radial air exhaust. The centrifugal fan 30b generally also has a volute (not shown) for accommodating the impeller. The volute has an axially open end in the axial direction and a radially open end in the radial direction. The drive component is fixed to the volute, thus facilitating connection with the impeller. Of course, in other embodiments, the drive component can also be fixed to other structures, such as the housing 10.

[0189] The hub 31b of the centrifugal fan is generally large, while the blades 33b are small and numerous. The blades 33b are located on the circumference of the hub 31b, and their thickness gradually decreases along the airflow direction, thereby reducing wear between the blades and the airflow and extending their service life. The first surface 33a1 and the second surface 33a3 of the blades 33b in this centrifugal fan 30b are not perpendicular to the airflow direction, but are approximately parallel to it. Both the first surface 33a1 and the second surface 33a3 of the blades 33b are coated with a polyurea protective layer 900, which effectively absorbs energy, reduces friction between the airflow and the surface of the blades 33b, and thus reduces noise. Furthermore, by improving the high-temperature resistance of the blades 33b, the probability of blade deformation can be reduced, ensuring sufficient airflow.

[0190] Please combine Figure 35 and Figure 36 In an optional embodiment, the hub 31b includes a base plate 31b1 and a surrounding plate 31b3 connected to the periphery of the base plate 31b1, and a plurality of blades 33b are spaced apart on the inner periphery of the surrounding plate 31b3, and the surrounding plate 31b3 is provided with an air outlet.

[0191] The bottom plate 31b1 has a polyurea protective layer 900 on the surface opposite to the surrounding plate 31b3;

[0192] And / or, the outer periphery of the enclosure 31b3 is provided with a polyurea protective layer 900.

[0193] In this embodiment, the hub 31b includes a base plate 31b1 and a surrounding plate 31b3. The base plate 31b1 is disc-shaped with a motor 37a hole in the center for mates with the motor 37a, facilitating assembly with the motor 37a. The surrounding plate 31b3 surrounds the periphery of the base plate 31b1, and blades 33b are connected to the inner periphery of the surrounding plate 31b3. The surrounding plate 31b3 has multiple air outlets, each located between two blades 33b, thus facilitating airflow. Here, the base plate 31b1, the surrounding plate 31b3, and the blades 33b are integrally formed, which is convenient for processing and has high structural strength.

[0194] After coating the surface of the blade 33b with a polyurea protective layer 900, in order to ensure the structural strength of the hub 31b, a polyurea protective layer 900 is provided on the surface of the base plate 31b1 facing away from the surrounding plate 31b3. This structure can significantly improve the compressive strength of the hub 31b, effectively ensure the heat exchange air volume of the impeller per unit time, and reduce the impact of the high-temperature airflow flowing through the hub 31b, reduce the thermal deformation of the hub 31b in a high-temperature environment, and improve the structural stability of the centrifugal fan 30b.

[0195] Based on the polyurea protective layer 900, a polyurea protective layer 900 can be coated on the outer periphery of the enclosure 31b3, thereby improving the strength of the enclosure 31b3 and reducing wear on the enclosure 31b3. Simultaneously, the polyurea protective layer 900, together with other polyurea protective layers 900, forms a closed-loop protective layer, effectively enhancing the connection stability between multiple protective layers. This further improves the overall structural strength of the centrifugal fan 30b, forming a tough protective layer on its surface, reducing noise, improving deformation resistance, enhancing high-temperature resistance, extending its service life, and ensuring airflow. Of course, in other embodiments, the polyurea protective layer 900 can also be provided only on top of the existing polyurea protective layer 900.

[0196] Please refer to this again. Figure 7 and Figure 10 As can be seen, in order to achieve heat exchange, the outdoor unit 100 of the air conditioner is also equipped with an outdoor heat exchanger 60. A heat exchange air duct is formed inside the casing 10. An air outlet 111 is opened on the outdoor front panel 11, and an air inlet is opened on the right side panel 13. The outdoor heat exchanger 60 is located between the air inlet and the fan structure 30. The air outlet 111 is set in a direction corresponding to the air outlet of the fan structure 30. When the fan structure 30 is running, the airflow enters from the air inlet, passes through the outdoor heat exchanger 60 for heat exchange, and is directly blown out from the air outlet 111, thereby effectively reducing air volume loss.

[0197] In addition, an air guide ring 18 is installed around the air outlet 111. The air guide ring 18 is circular and extends a certain width in the axial direction of the air outlet 111. It can overlap with the blades 33a in the axial flow fan 30a in the axial direction of the air outlet 111, so that the airflow can be blown out of the air outlet 111 more quickly and the air outlet efficiency can be improved.

[0198] Combined Figure 28 and Figure 29 To improve assembly stability, in an optional embodiment, the outdoor unit 100 of the air conditioner further includes a motor bracket 19, which is installed inside the housing 10, and the fan structure 30 is installed on the motor bracket 19.

[0199] In this embodiment, the motor bracket 19 has a motor hole through which the motor 37a can pass. A mounting portion is provided around the periphery of the motor 37a, and the motor bracket 19 has a corresponding connecting structure. The two are connected by threads to achieve stable assembly. Here, the motor bracket 19 can be made of sheet metal, with its upper and lower ends bent and extended to form abutment plates, respectively abutting against the top cover 15 and the base 17 of the housing 10, and achieving stable installation through threaded connection. It is understandable that to reduce the overall weight, perforated holes can be provided in the motor bracket 19. These holes also facilitate the rapid dissipation of heat generated by the motor 37a and the impeller, improving heat dissipation efficiency.

[0200] Of course, in other embodiments, the motor bracket 19 may also be a right-angled plate or other structural configurations.

[0201] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An air conditioner comprising an air conditioner outdoor unit and an air conditioner indoor unit, characterized by, The air conditioner indoor unit comprises an indoor unit shell and an indoor heat exchanger arranged in the air conditioner indoor unit shell, and the air conditioner outdoor unit comprises an outdoor unit shell and a compressor, a liquid storage tank, an outdoor heat exchanger and a four-way valve assembly arranged in the outdoor unit shell, and the compressor, the four-way valve assembly, the outdoor heat exchanger, the indoor heat exchanger and the liquid storage tank are sequentially connected to form a refrigerant closed loop. The indoor unit shell comprises a face frame and an indoor front panel arranged on the face frame, and the indoor front panel is coated with the polyurea protective layer on the inner surface of the face frame; the indoor front panel comprises a panel body and a buckle arranged on the panel body, and the surface of the face frame is provided with a clamping hole matched with the buckle for clamping, and the outer surface of the buckle is coated with the polyurea protective layer. The outdoor unit shell comprises an outdoor front panel, a top cover, a right surrounding plate and a bottom plate connected with each other, and the outdoor front panel, the top cover, the right surrounding plate and the bottom plate form an accommodating cavity, and the surface of the outdoor unit shell is coated with the polyurea protective layer, that is, the polyurea protective layer is coated on the corners of at least one of the outdoor front panel, the top cover, the right surrounding plate and the bottom plate. The four-way valve assembly comprises a four-way valve, an exhaust pipe connected to four outlets of the four-way valve, a return air pipe, a low-pressure valve assembly and a valve cooling pipe, the exhaust pipe is connected to the exhaust port of the compressor, the return air pipe is connected to the return air port of the liquid storage tank, the low-pressure valve assembly is connected to the indoor heat exchanger, and the valve cooling pipe is connected to the outdoor heat exchanger; the connection position between the exhaust pipe and the exhaust port of the compressor is coated with the polyurea welding port protective layer; and the connection position between the return air pipe and the return air port of the liquid storage tank is coated with the polyurea welding port protective layer. The air conditioner further comprises two fan structures, one of which is arranged in the air conditioner indoor unit, and the other of which is arranged in the air conditioner outdoor unit, the fan structure comprises a hub and a plurality of blades, a plurality of the blades are arranged on the circumferential surface of the hub, each of the blades has a first surface and a second surface opposite to each other; the first surface and / or the second surface is covered with the polyurea protective layer; when the fan structure is an axial flow fan, the first surface of the blade faces the air inlet side of the fan structure, the second surface of the blade faces the air outlet side of the fan structure, and the outer edge surface of the polyurea protective layer covering the second surface is arranged at an angle α with the outer edge surface of the blade, wherein the angle α ranges from 2° to 8°.

2. The air conditioner of claim 1, wherein The abutting position of any two of the outdoor front panel, the top cover, the right surrounding plate and the bottom plate connected with each other is coated with the polyurea protective layer. And / or, the inner surface and / or the outer surface of the bottom plate is coated with the polyurea protective layer. And / or, the outer surface of the bottom plate is provided with a bottom foot, and the inner surface and / or the outer surface of the bottom foot is coated with the polyurea protective layer.

3. The air conditioner of claim 1, wherein The outdoor unit shell further comprises a middle partition plate connected to the bottom plate to divide the accommodating cavity into a fan cavity and a compressor cavity, and the cavity wall of the compressor cavity is coated with the polyurea protective layer.

4. The air conditioner of claim 3, wherein The bottom plate comprises a compression cavity and a fan cavity, the compression cavity is provided with a connecting column connected with the compressor, and the surface of the connecting column is coated with the polyurea protective layer.

5. The air conditioner of claim 4, wherein The outdoor unit of the air conditioner further comprises a compressor base frame, the compressor is fixed on the compressor base frame, the compressor base frame is provided with a mounting hole, a foot pad is arranged between the compressor base frame and the connecting column, the foot pad is sleeved on the connecting column and partially penetrates into the mounting hole, a locking member locks the connecting column and abuts against the compressor base frame, and at least part of the outer surface of the foot pad is coated with the polyurea protective layer.

6. The air conditioner of claim 5, wherein The foot pad comprises a base portion and a throat portion protruding from the middle portion of the base portion, the end surface of the base portion towards the throat portion is a first platform, the end surface of the throat portion is a second platform, and the polyurea protective layer is arranged on the outer surface of the base portion or the peripheral surface of the base portion. Furthermore, the foot pad is provided with a through foot pad hole, and the inner wall of the foot pad hole is coated with the polyurea protective layer. Furthermore, the surface of the compressor base frame towards the bottom plate is coated with the polyurea protective layer.

7. The air conditioner of claim 3, wherein The thickness range D1 of the polyurea protective layer coated on the cavity wall of the compressor cavity is 0.5mm-5mm; Furthermore, the thickness range D2 of the polyurea protective layer coated on the outer surface of the compressor is 0.25mm-50mm; Furthermore, the thickness range D3 of the polyurea protective layer coated on the outer surface of the liquid storage tank is 0.25mm-60mm; Furthermore, the compressor is communicated with the liquid storage tank through a connecting pipe, and the peripheral surface of the connecting pipe is coated with the polyurea protective layer.

8. The air conditioner of claim 1, wherein The covering height of the polyurea welding joint protective layer on the exhaust pipe is H1, and the range of H1 is 20mm-35mm; Furthermore, the covering height of the polyurea welding joint protective layer on the gas return pipe is H2, and the range of H2 is 35mm-40mm; Furthermore, the thickness range D4 of the polyurea protective layer coated on the exhaust pipe, the gas return pipe, the low-pressure valve assembly, the valve cooling pipe and the four-way valve is 0.5mm-3.5mm.

9. The air conditioner of claim 1, wherein The polyurea pipeline interconnection coating is formed between the pipe sections of the exhaust pipe and the gas return pipe which are parallel to each other. Furthermore, the part of the exhaust pipe close to the bottom plate is coated with a polyurea counterweight coating.

10. The air conditioner of claim 1, wherein The outdoor unit shell further comprises a large handle structure, the large handle structure is connected to the outer surface of the right surrounding plate, and the inner surface and / or the outer surface of the large handle structure is coated with a polyurea fireproof layer.

11. The air conditioner of claim 1, wherein The end portion of the compressor is further provided with a compressor terminal, the end portion of the compressor is connected with a compressor terminal cover covering the compressor terminal, and the inner surface of the compressor terminal cover is coated with a polyurea fireproof layer. Furthermore, the air conditioner indoor unit further comprises an electric control box arranged in the indoor unit shell, a plurality of wiring terminals are arranged in the electric control box, and the inner surface and / or the outer surface of the electric control box is coated with a polyurea fireproof layer.

12. The air conditioner of claim 1, wherein The material of the blade is polypropylene; Furthermore, the fan structure is an axial flow fan or a centrifugal fan.

13. The air conditioner of claim 1, wherein In the direction from the hub to the edge of the blade, the width of the outer edge surface of the polyurea protective layer covering the second surface is L, and the range of L is 3mm-7mm.

14. The air conditioner of claim 1, wherein The fan structure further comprises a motor and a locking member, the hub is installed on a driving shaft of the motor, a free end of the driving shaft penetrates through an end surface of the hub, an end surface of the hub away from the motor is coated with a polyurea damping layer, and the locking member is installed on the free end of the driving shaft and abuts against the polyurea damping layer.

15. The air conditioner of claim 14, wherein The thickness D5 of the polyurea protective layer coated on the blade ranges from 0.5 mm to 3 mm. And / or, the thickness D6 of the polyurea damping layer ranges from 3 mm to 6 mm.

16. The air conditioner of claim 1, wherein The surface of the polyurea protective layer coated on the blade is provided with a plurality of concave-convex parts arranged in a matrix.

17. The air conditioner of claim 1, wherein When the fan structure is a centrifugal fan, the hub comprises a bottom plate and a surrounding plate connected to the periphery of the bottom plate, a plurality of blades are arranged at intervals on the inner periphery of the surrounding plate, and the surrounding plate is provided with air outlet holes; The surface of the bottom plate away from the surrounding plate is provided with the polyurea protective layer; And / or, the outer periphery of the surrounding plate is provided with the polyurea protective layer.

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