Heat exchanger, outdoor unit, air conditioner and defrosting drainage control method

Abstract

The present invention provides a heat exchanger, an outdoor unit, an air conditioner and a defrosting drainage control method, relating to the technical field of air conditioners, and solving the technical problem that condensed water is likely to accumulate on the surface of the heat exchange tubes of a microchannel heat exchanger, affecting the heat exchange effect. The heat exchanger includes fins, a heat conduction part and heat exchange tubes having microchannels. All the heat exchange tubes are arranged vertically or inclined with respect to the horizontal plane, or some of the heat exchange tubes are arranged vertically; the heat conduction part is connected to two adjacent heat exchange tubes, the fins are fixed on the heat conduction part, the fins are arranged vertically or inclined with respect to the horizontal plane, or some of the fins are arranged vertically, and the condensed water can drip under the action of gravity along the surface of the heat exchange tubes and / or the surface of the fins. In the heating mode of the air conditioner of the present invention, when condensed water is generated on the surface of the heat exchanger, the condensed water can drip under the action of gravity along the surface of the heat exchange tubes and / or the surface of the fins, preventing the condensed water from accumulating and causing the frost layer to become thick and affecting the heat exchange efficiency, and ensuring the heating effect of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a heat exchanger, an outdoor unit, an air conditioner, and a defrosting and drainage control method. Background Art

[0002] The microchannel heat exchanger in the prior art is usually used as an outdoor heat exchanger. Refer to Figure 1 and Figure 2 As shown, the microchannel heat exchanger in the prior art includes a heat exchange tube 1', fins 2', a water inlet pipe 3', a water outlet pipe 4', and a diverter 5'. Among them, the water inlet pipe 3' is connected to all the heat exchange tubes, different pipe segments of the water inlet pipe 3' are connected to the diverter 5' through a diversion channel, the diverter 5' is connected to an expansion valve, the water outlet pipe 4' is connected to all the heat exchange tubes, and the water outlet pipe 4' is connected to a four-way valve; the heat exchange tube 1' is horizontally arranged, the refrigerant flows in the heat exchange tube 1', the fins 2' are fixed between adjacent two heat exchange tubes 1' and are directly fixedly connected to the heat exchange tube 1', which can increase the heat exchange area between the refrigerant and the air.

[0003] The applicant of the present invention has found that the prior art has at least the following technical problems: Refer to Figure 2 As shown, in the prior art, the heat exchange tube is a flat tube, that is, its upper surface is flat and wide. During the heating process of the air conditioner, when the microchannel heat exchanger is used as an evaporator, condensate will be generated on the surface of the heat exchange tube, and the condensate is likely to accumulate on the flat surface of the heat exchange tube and is difficult to drain. And during the heating operation, the surface temperature of the heat exchange tube of the microchannel heat exchanger (outdoor heat exchanger) is low, and the accumulated condensate is likely to frost and ice on the surface of the heat exchange tube, which exacerbates the rapid thickening of the frost layer, blocks the air heat exchange flow channel of the fins, affects the heat exchange between the heat exchanger and the air, and further deteriorates the heating effect of the air conditioner. Summary of the Invention

[0004] The purpose of the present invention is to provide a heat exchanger, an outdoor unit, an air conditioner, and a defrosting and drainage control method to solve the technical problem that condensate is likely to accumulate on the heat exchange tube surface of the microchannel heat exchanger in the prior art and affect the heat exchange effect. The many technical effects that can be produced by the preferred technical solutions provided by the present invention are described in detail below.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The heat exchanger provided by the present invention includes fins, a heat conduction part, and a heat exchange tube with microchannels, wherein:

[0007] The heat exchange tube is vertically arranged or inclined with respect to the horizontal plane, or part of the heat exchange tubes are vertically arranged;

[0008] The heat conducting part is connected to two adjacent heat exchange tubes, the fins are fixed on the heat conducting part, the fins are arranged vertically or inclined with respect to the horizontal plane, or some of the fins are arranged vertically, and the condensed water can drip under the action of gravity along the surface of the heat exchange tube and / or the surface of the fins.

[0009] Preferably, the heat conducting part is arranged horizontally or inclined with respect to the horizontal plane, and all the fins on the same heat conducting part are arranged at intervals along the length direction of the heat conducting part.

[0010] Preferably, all the heat exchange tubes are arranged at intervals in the horizontal direction, and one or more than two layers of fins are arranged between two adjacent heat exchange tubes.

[0011] Preferably, one of the heat exchange tube and the heat conducting part is provided with a convex part, and the other is provided with a concave part, and the convex part is inserted into the concave part to fixedly assemble the heat exchange tube and the heat conducting part.

[0012] Preferably, the convex part is provided with an outer conical surface, the concave part is provided with an inner conical surface, and when the convex part is inserted into the concave part, the outer conical surface and the inner conical surface are closely fitted.

[0013] Preferably, the heat exchanger further includes a shunt main pipe, the shunt main pipe includes more than two shunt pipe segments, any two shunt pipe segments are independently separated, and each shunt pipe segment is connected to the inlet ends of one or more than two heat exchange tubes, and the inlet of each shunt pipe segment is connected to a spray pipe.

[0014] Preferably, two adjacent spray pipes are respectively located on both sides of the vertical plane passing through the central axis of the shunt main pipe.

[0015] Preferably, a shunt partition is arranged in the shunt pipe segment, the shunt partition divides the inner cavity of the shunt pipe segment into an upper cavity and a lower cavity, the spray pipe is connected to the corresponding upper cavity, and the heat exchange tube is connected to the corresponding lower cavity;

[0016] The shunt partition is provided with shunt holes, and the upper cavity and the corresponding lower cavity are connected through the shunt holes, so that the refrigerant generates a jet flow when flowing through the shunt holes.

[0017] Preferably, the shunt partition is arranged along the length direction of the shunt pipe segment, and all the shunt holes on the same shunt partition are evenly arranged at intervals on the shunt partition.

[0018] Preferably, the heat exchanger further includes an outlet main pipe, and the outlet main pipe connects the outlet ends of all the heat exchange tubes.

[0019] The present invention also provides an outdoor unit, including the above-mentioned heat exchanger.

[0020] The present invention also provides an air conditioner, including the above-mentioned outdoor unit.

[0021] The present invention also provides a defrosting and drainage control method for the air conditioner based on the above, and the control method includes:

[0022] In the defrosting mode, when power is first applied or when the defrosting time is greater than the first preset time, and the high pressure of the refrigeration system in the air conditioner is greater than or equal to the first preset pressure, and the temperature change of the surface of the heat exchange tube of the outdoor unit is positive within the first target time period, control the heat exchange fan of the outdoor unit to rotate in the reverse direction compared with the heating mode, so as to make the heat exchange fan blow the condensed water droplets to fall.

[0023] Preferably, controlling the heat exchange fan of the outdoor unit to rotate in the reverse direction compared with the heating mode includes:

[0024] Control the heat exchange fan of the outdoor unit to rotate in the reverse direction at the highest operating frequency compared with the heating mode.

[0025] Preferably, when exiting the defrosting mode, or when the heat exchange fan operates continuously at the highest operating frequency for the second preset time, or when the temperature of the surface of the heat exchange tube of the outdoor unit is less than the preset temperature within the second target time period, control the heat exchange fan to stop rotating in the reverse direction.

[0026] The heat exchanger, outdoor unit, air conditioner and defrosting and drainage control method provided by the present invention have the following beneficial effects compared with the prior art: The heat exchange tubes in the microchannel heat exchanger are arranged vertically or inclined with respect to the horizontal plane, and a heat conduction part is arranged between adjacent two heat exchange tubes. The heat conduction part can transfer the heat of the heat exchange tubes to the fins, and the heat conduction part is convenient for fixing the fins between the two heat exchange tubes, so that the fins are arranged vertically or inclined with respect to the horizontal plane. In the heating mode, when condensed water is generated on the surface of the heat exchanger, the condensed water can drip along the surface of the heat exchange tubes and / or the surface of the fins under the action of gravity, preventing the condensed water from accumulating on the surface of the heat exchange tubes and causing the frost layer to thicken and affect the heat exchange efficiency, effectively prolonging the continuous heating operation time of the heat exchanger, improving the heating comfort, and ensuring the heating effect of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1It is a schematic structural diagram of a prior art microchannel heat exchanger;

[0029] Figure 2 It is a partially enlarged schematic diagram of a heat exchange tube and a fin in a prior art microchannel heat exchanger;

[0030] Figure 3 It is a schematic overall structure diagram of the heat exchanger of the present invention;

[0031] Figure 4 It is Figure 3 A partially enlarged view at position A in

[0032] Figure 5 It is a schematic diagram of the fixing structure of the fin and the heat conduction part;

[0033] Figure 6 It is a schematic diagram of the partial structure of the heat exchange tube;

[0034] Figure 7 It is a schematic diagram of the partial structure of the heat conduction part;

[0035] Figure 8 It is Figure 3 A schematic sectional structure diagram at B - B in

[0036] Figure 9 It is a schematic diagram of the air flow direction and refrigerant flow direction in the heating mode of an air conditioner in the prior art;

[0037] Figure 10 It is a schematic diagram of the air flow direction and refrigerant flow direction in the defrosting mode of the air conditioner of the present invention.

[0038] In the figure, 100 is an outdoor unit heat exchanger; 200 is a heat exchange fan; 300 is a four - way valve; 1 is a heat exchange tube; 101 is a microchannel; 11 is a convex part; 111 is an outer conical surface; 2 is a fin; 31 is a shunt pipe section; 311 is an upper cavity; 312 is a lower cavity; 32 is a shunt partition; 33 is a shunt hole; 4 is a water outlet main pipe; 5 is a shunt device; 6 is a spray pipe; 7 is a heat conduction part; 71 is a concave part; 701 is an inner conical surface. Detailed implementation manners

[0039] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other implementation manners obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope protected by the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center," "length," "width," "height," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and "side" and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0041] The embodiments of the present invention provide a heat exchanger, an outdoor unit, an air conditioner and a defrost drainage control method, which can prevent condensed water from accumulating on the surface of the heat exchange tube, causing the frost layer to thicken and affect the heat exchange efficiency, effectively extend the continuous heating operation time of the heat exchanger, and ensure the heating effect of the air conditioner.

[0042] The following combination Figures 3 - 10 The technical solution provided by the present invention is described in more detail.

[0043] Example 1

[0044] like Figures 3 - 10 As shown, this embodiment provides a heat exchanger, including fins 2, a heat conducting portion 7 and a heat exchange tube 1 with a microchannel 101, wherein: all the heat exchange tubes 1 are arranged vertically or inclined relative to the horizontal plane, or some of the heat exchange tubes are arranged vertically; the heat conducting portion 7 connects two adjacent heat exchange tubes 1, the fins 2 are fixed on the heat conducting portion 7, the fins 2 are arranged vertically or inclined relative to the horizontal plane, or some of the fins are arranged vertically, and condensed water can drip along the surface of the heat exchange tube 1 and / or the surface of the fin 2 under the action of gravity.

[0045] The heat exchanger can be a microchannel heat exchanger, Figure 5 and Figure 8 As shown, the heat exchange tube 1 is a flat tube with microchannels. Figure 3 and Figure 5 As shown, all heat exchange tubes 1 of this embodiment are vertically arranged, and all fins 2 are vertically arranged on the corresponding heat conducting parts 7 .

[0046] See also Figure 8 As shown, one or more microchannels 101 are provided in the heat exchange tube 1, and the microchannels 101 extend along the length of the heat exchange tube 1. When the refrigerant enters the heat exchange tube 1, it can be distributed to the microchannels, increasing the heat exchange area between the refrigerant and the air and enhancing the heat exchange effect.

[0047] See also Figure 1 and Figure 2As shown, the upper and lower ends of the fin 2 in the prior art are directly welded and fixed to the heat exchange tube 1. In this embodiment, since the heat exchange tube 1 is vertically arranged, in order to enable the fin 2 to be vertically arranged (facilitating the drainage of condensed water under the action of gravity and preventing liquid accumulation caused by the horizontal arrangement of the fin 2), a heat conduction part 7 is arranged between the two heat exchange tubes 1.

[0048] The functions of the above-mentioned heat conduction part 7 are as follows: one is to facilitate the fixing of the fin 2 between two adjacent heat exchange tubes 1, so that the fin 2 is vertically arranged; the other is to enhance heat conduction and transfer the heat of the heat exchange tube 1 to the fin 2. In order to reduce the self-weight and cost, the above-mentioned heat conduction part 7 can be a heat conduction tube, and no refrigerant flows through its interior.

[0049] In the heat exchanger of this embodiment, the heat exchange tubes 1 in the microchannel heat exchanger are vertically arranged or inclined with respect to the horizontal plane, and a heat conduction part 7 is arranged between two adjacent heat exchange tubes 1. The heat conduction part 7 can transfer the heat of the heat exchange tube 1 to the fin 2, and the heat conduction part 7 facilitates the fixing of the fin 2 between the two heat exchange tubes 1, so that the fin 2 is vertically arranged or inclined with respect to the horizontal plane. In the heating mode, when condensed water is generated on the surface of the heat exchanger, the condensed water can drip under the action of gravity along the surface of the heat exchange tube 1 and / or the surface of the fin 2, preventing the condensed water from accumulating on the surface of the heat exchange tube 1, resulting in the thickening of the frost layer and affecting the heat exchange efficiency, effectively prolonging the continuous heating operation time of the heat exchanger, improving the heating comfort, and ensuring the heating effect of the air conditioner.

[0050] As an optional implementation manner, refer to Figures 3 - 5 As shown, the heat conduction part 7 is horizontally arranged or inclined with respect to the horizontal plane, and all the fins 2 on the same heat conduction part 7 are arranged at intervals along the length direction of the heat conduction part 7.

[0051] Preferably, the heat conduction part 7 is horizontally arranged. In this way, when all the fins 2 on the same heat conduction part 7 are arranged at intervals along the length direction of the heat conduction part 7, the fins 2 are vertically arranged, and there are gaps between adjacent fins 2. The condensed water generated on the surface of the heat exchanger can drip under the action of gravity along the fins 2 and the heat exchange tubes 1, preventing the condensed water from accumulating.

[0052] Refer to Figure 5 , openings penetrating both sides of the fin 2 are provided on the fin 2, facilitating the airflow to pass through the fin 2 and being beneficial to heat exchange.

[0053] As an optional implementation manner, refer to Figure 3 As shown, all the heat exchange tubes 1 are arranged at intervals in the horizontal direction, and one layer or two or more layers of fins 2 are arranged between two adjacent heat exchange tubes 1.

[0054] The distance between adjacent heat exchange tubes 1 is equal, facilitating uniform heat exchange between the refrigerant and air. Preferably, there are two or more layers of fins 2 provided between adjacent heat exchange tubes 1, facilitating the uniform distribution of fins 2 between the heat exchange tubes 1, increasing the contact area between the fins 2 and air, and improving the heat exchange effect.

[0055] As an alternative embodiment, in one of the heat exchange tube 1 and the heat conducting part 7 of this embodiment, a convex part 11 is provided on one of them, and a concave part 71 is provided on the other. The convex part 11 is inserted into the concave part 71 to fixedly assemble the heat exchange tube 1 and the heat conducting part 7.

[0056] See Figure 4 、 Figure 6 and Figure 7 As shown, in this embodiment, a convex part 11 is provided on the outer wall of the heat exchange tube 1, and concave parts 71 are provided at both ends of the heat conducting part 7. When assembling the heat exchange tube 1 and the heat conducting part 7, the convex parts 11 of two adjacent heat exchange tubes 1 are respectively inserted into the concave parts 71 at both ends of the heat conducting part 7, facilitating the positioning of the heat conducting part 7 and simultaneously completing the plug-in fixation of the heat conducting part 7 and the heat exchange tube 1; the above structure facilitates the positioning and assembly between the heat conducting part 7 and the heat exchange tube 1.

[0057] As an alternative embodiment, see Figure 6 and Figure 7 As shown, an outer conical surface 111 is provided on the convex part 11, and an inner conical surface 7o1 is provided on the concave part 71. When the convex part 11 is inserted into the concave part 71, the outer conical surface 111 and the inner conical surface 7o1 are in close contact.

[0058] When inserting the convex part 11 of the heat exchange tube 1 into the corresponding concave part 71, due to the matching structure of the outer conical surface 111 and the inner conical surface 7o1, it can play a certain guiding role and facilitate the insertion of the convex part 11; and when the convex part 11 and the concave part 71 are installed in place, it can increase the heat conducting area of the heat conducting part 7 and facilitate the heat exchange tube 1 to transfer heat to the heat conducting part 7.

[0059] As an alternative embodiment, see Figure 3 As shown, the heat exchanger of this embodiment further includes a shunt main pipe, and the shunt main pipe includes two or more shunt pipe segments 31. Any two shunt pipe segments 31 are independently separated and arranged, and each shunt pipe segment 31 is connected to the inlet end of one or two or more heat exchange tubes 1, and the inlet of each shunt pipe segment 31 is connected to a spray pipe 6.

[0060] Specifically, see Figure 3, the main flow divider is connected to the inlet ends of all the heat exchange tubes 1. The above-mentioned flow dividing pipe segments 31 are formed by partitioning the main flow divider through internal partition plates, and there is no connection between any two flow dividing pipe segments 31. Each flow dividing pipe segment 31 is connected to the inlet ends of more than two heat exchange tubes 1. All the injection tubes 6 are connected to the same flow divider 5 through a flow dividing channel, and the flow divider 5 is connected to the expansion valve in the refrigeration system. After passing through the expansion valve, the refrigerant can be divided by the flow divider 5 into different injection tubes 6, and reach the corresponding flow dividing pipe segments 31 through the injection tubes 6, and then flow into the corresponding heat exchange tubes 1, and enter the micro-channels in the heat exchange tubes 1 to exchange heat with air in the micro-channels. The above structure can evenly distribute the refrigerant into different heat exchange tubes 1, which is beneficial to the uniform heat exchange between the refrigerant and air.

[0061] As an optional implementation manner, refer to Figure 8 As shown, two adjacent injection tubes 6 are respectively located on both sides of the vertical plane passing through the central axis of the main flow divider. The above structure facilitates the pipe layout of the injection tubes 6.

[0062] As an optional implementation manner, refer to Figure 8 As shown, a flow dividing partition 32 is arranged in the flow dividing pipe segment. The flow dividing partition 32 is arranged horizontally, and the inner cavity of the flow dividing pipe segment is divided into an upper cavity 311 and a lower cavity 312 by the flow dividing partition 32. The injection tube 6 is connected to the corresponding upper cavity 311, and the heat exchange tube 1 is connected to the corresponding lower cavity 312; a flow dividing hole 33 is arranged on the flow dividing partition 32, and the upper cavity 311 and the corresponding lower cavity 312 are connected through the flow dividing hole 33, so that the refrigerant will generate a jet flow when flowing through the flow dividing hole 33.

[0063] Preferably, the above-mentioned flow dividing hole 33 is located at the middle position of the flow dividing partition 32.

[0064] When the refrigerant enters the corresponding flow dividing pipe segment 31 from the injection tube 6, it first enters the upper cavity 311. Since the aperture of the flow dividing hole 33 is smaller than the inner diameters of the first cavity and the second cavity, the refrigerant will generate a jet flow when passing through the flow dividing hole 33 during the process of entering the lower cavity 312 from the upper cavity 311, which is convenient for the refrigerant to be evenly distributed into the micro-channels in the heat exchange tube 1, so that the refrigerant can exchange heat with air evenly and improve the heat exchange effect.

[0065] As an optional implementation manner, refer to Figure 3 As shown, the flow dividing partition 32 is arranged along the length direction of the flow dividing pipe segment 31, and all the flow dividing holes 33 on the same flow dividing partition 32 are evenly arranged at intervals on the flow dividing partition 32.

[0066] When the refrigerant enters the corresponding flow dividing pipe segment 31 from the injection tube 6, it can be evenly distributed into different heat exchange tubes 1 through the flow dividing holes 33 on the flow dividing partition 32, so that the refrigerant can exchange heat with air evenly and improve the heat exchange effect.

[0067] As an optional implementation, refer to Figure 3 As shown, the heat exchanger of this embodiment further includes an outlet main pipe 4, and the outlet main pipe 4 connects the outlet ends of all the heat exchange pipes 1. The refrigerants of all the heat exchange pipes 1 are jointly introduced into the outlet main pipe 4 and flow into the four-way valve 300 together when the air conditioner is in the heating mode.

[0068] Embodiment Two

[0069] This embodiment provides an outdoor unit including the above-mentioned heat exchanger.

[0070] In the outdoor unit of this embodiment, since it includes the above-mentioned heat exchanger, the condensed water can drip under the action of gravity along the surface of the heat exchange pipe 1 and / or the surface of the fin 2, preventing the condensed water from accumulating on the surface of the heat exchange pipe 1, resulting in a thicker frost layer and affecting the heat exchange efficiency, effectively prolonging the continuous heating operation time of the heat exchanger, improving the heating comfort, and ensuring the heating effect of the air conditioner.

[0071] Embodiment Three

[0072] This embodiment provides an air conditioner including the above-mentioned outdoor unit.

[0073] In the air conditioner of this embodiment, since it includes the above-mentioned outdoor unit, it can also prevent the condensed water from accumulating on the surface of the heat exchange pipe 1, resulting in a thicker frost layer and affecting the heat exchange efficiency, effectively prolonging the continuous heating operation time of the heat exchanger, improving the heating comfort, and ensuring the heating effect of the air conditioner.

[0074] Embodiment Four

[0075] Refer to Figure 9 As shown, in a humid and cold temperature, when the air conditioning system operates in the heating mode for a long time, the outdoor unit heat exchanger 100 acts as an evaporator. Since the surface temperature of the outdoor heat exchanger is below 0°C, the gaseous moist air in the outdoor air condenses into frost, and under the drainage of the outdoor heat exchange fan 200, the frost will cover the entire outdoor heat exchanger, blocking the heat exchange between the outdoor unit heat exchanger 100 and the air. As a result, the outdoor unit cannot absorb heat from the outside, leading to a decrease in the air outlet temperature of the indoor unit and the inability to generate any hot air, resulting in poor user comfort and also endangering the safety of the unit. In the heating mode, when the defrosting condition is met, the four-way valve 300 changes direction, making the system directly receive the high-temperature and high-pressure gaseous refrigerant discharged from the compressor by the heat exchanger 100 of the heating mode machine. Through the high-temperature refrigerant, the frost attached to the outdoor heat exchanger is melted to form liquid water flowing out of the outdoor heat exchanger. When entering the heating mode again, the outdoor unit heat exchanger 100 can fully absorb heat from the outdoor environment, ensuring the air outlet temperature of the indoor unit.

[0076] Once the air conditioner enters the defrosting mode, due to the change of direction of the four-way valve 300, the indoor unit heat exchanger no longer acts as a condenser but becomes an evaporator, and the temperature becomes lower. If the defrosting lasts for a long time, it will seriously affect the heating on the indoor side.

[0077] See also Figure 9 As shown, the arrow direction at the heat exchange fan 200 in the figure indicates the air flow direction. During normal heating, the heat exchange fan 200 of the outdoor unit rotates, causing the air to pass through the outdoor unit heat exchanger 100 to complete the heat exchange between the air and the refrigerant. However, after the outdoor unit adopts the heat exchanger (microchannel heat exchanger) in the first embodiment above, if the heat exchange fan 200 still rotates in the above manner, the wind direction will affect the dripping of condensate under the action of gravity.

[0078] To address the above problem, this embodiment provides a defrosting and drainage control method based on the above air conditioner. The control method includes:

[0079] In the defrosting mode, when power is first applied or when the defrosting time is greater than the first preset time, and the pressure of the refrigeration system in the air conditioner is greater than or equal to the first preset pressure, and the temperature change amount on the surface of the heat exchange tubes of the outdoor unit is positive within the first target time period, control the heat exchange fan 200 of the outdoor unit to rotate in the reverse direction compared to the heating mode, so as to make the heat exchange fan 200 blow the condensate to drip.

[0080] Preferably, controlling the heat exchange fan 200 of the outdoor unit to rotate in the reverse direction compared to the heating mode includes:

[0081] Control the heat exchange fan 200 of the outdoor unit to rotate in the reverse direction at the highest operating frequency compared to the heating mode; this is convenient for improving the drainage efficiency.

[0082] Among them, the value range of the above first preset time is 1 min - 5 min, preferably 3 min. The first preset pressure is preferably the pressure corresponding to a saturation temperature of 20°C. The value range of the first target time period is 40 s - 80 s, preferably 60 s.

[0083] Due to the low surface smoothness of the heat exchange tubes 1 of the microchannel heat exchanger and the absence of a hydrophilic film on the pure aluminum surface, condensate will adhere to the heat exchanger and cannot effectively drain by gravity naturally. See also Figure 10 As shown, when the heat exchange fan 200 of the outdoor unit rotates in the reverse direction compared to the heating mode, the wind direction is along the direction of the dripping of the condensate, preventing the condensate from adhering to the surface of the heat exchange tubes 1, and being able to accelerate the dripping of the condensate along the surfaces of the heat exchange tubes 1 and the fins 2, thereby improving the heat exchange effect.

[0084] When power is first applied or when the defrosting time is greater than the first preset time, the heat exchange fan 200 is rotated in the reverse direction at the highest operating frequency, which is beneficial to quickly shorten the defrosting time of the outdoor unit heat exchanger and prevent the indoor heating from being affected by long-term defrosting; when the pressure of the refrigeration system in the air conditioner is greater than or equal to the first preset pressure, it indicates that the air conditioner has a sufficiently high defrosting temperature to ensure rapid defrosting, thus ensuring the comfort of heating; when the temperature change of the surface of the outdoor unit heat exchanger is positive within the first target time period (when the temperature of the surface of the outdoor unit heat exchange pipe gradually increases), it indicates that the defrosting mode is in a stable stage, which can ensure the stable operation of the defrosting program of the air conditioner.

[0085] The defrosting drainage control method of this embodiment controls the heat exchange fan 200 of the outdoor unit to rotate in the reverse direction compared with the heating mode when the above conditions are satisfied simultaneously, which can ensure rapid defrosting of the air conditioner, thus ensuring the comfort of heating.

[0086] As an optional implementation manner, when exiting the defrosting mode, or when the heat exchange fan 200 continuously operates at the highest operating frequency for the second preset time, or when the temperature of the surface of the outdoor unit heat exchange pipe is less than the preset temperature within the second target time period (when the temperature of the surface of the outdoor unit heat exchange pipe gradually decreases), the reverse rotation of the heat exchange fan 200 is controlled to stop.

[0087] The value range of the above second preset time is 20s - 40s, and preferably 30s. The value range of the above second target time period is 10s - 30s, and preferably 20s. The value range of the above preset temperature is -3°C - 2°C, and preferably -1°C.

[0088] Making the heat exchange fan 200 stop rotating in the reverse direction when the above conditions are satisfied simultaneously can prevent the defrosting mode from seriously affecting the indoor heating and improve the heating comfort.

[0089] In the description of this specification, specific features, structures or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0090] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0091] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described.

Claims

1. A heat exchanger, characterized in that: The heat exchange device comprises fins, a heat conducting portion and a heat exchange tube with microchannels, wherein: The heat exchange tubes are arranged vertically or inclined relative to the horizontal plane, the heat conducting portion connects two adjacent heat exchange tubes, and the fins are fixed to the heat conducting portion. The fins are arranged vertically or inclined relative to the horizontal plane, so that condensed water can drip along the surfaces of the heat exchange tubes and the fins under the action of gravity; The heat conducting portion is arranged horizontally or tilted relative to a horizontal plane, and all the fins on the same heat conducting portion are arranged at intervals along the length direction of the heat conducting portion; One of the heat exchange tube and the heat conducting part is provided with a protrusion, and the other is provided with a depression. The protrusion is inserted into the depression to fix the heat exchange tube and the heat conducting part together.

2. The heat exchanger according to claim 1, characterized in that All the heat exchange tubes are arranged at intervals in the horizontal direction, and one or more layers of fins are provided between two adjacent heat exchange tubes.

3. The heat exchanger according to claim 1, characterized in that The raised portion is provided with an outer conical surface, and the recessed portion is provided with an inner conical surface. When the raised portion is inserted into the recessed portion, the outer conical surface and the inner conical surface are tightly fitted.

4. The heat exchanger according to claim 1, characterized in that The heat exchanger also includes a diversion main pipe, which includes two or more diversion pipe sections. Any two of the diversion pipe sections are independently separated and each of the diversion pipe sections is connected to the inlet end of one or more of the heat exchange tubes, and the inlet of each of the diversion pipe sections is connected to an injection pipe.

5. The heat exchanger according to claim 4, characterized in that The two adjacent injection pipes are respectively located on both sides of a vertical plane passing through the central axis of the branch main pipe.

6. The heat exchanger according to claim 4, characterized in that A diversion baffle is provided in the diversion pipe section, and the diversion baffle divides the inner cavity of the diversion pipe section into an upper cavity and a lower cavity. The injection pipe is connected to the corresponding upper cavity, and the heat exchange pipe is connected to the corresponding lower cavity. The diversion baffle is provided with a diversion hole, and the upper cavity and the corresponding lower cavity are connected through the diversion hole, so that the refrigerant generates a jet when flowing through the diversion hole.

7. The heat exchanger according to claim 6, characterized in that The diversion baffle is arranged along the length direction of the diversion pipe section, and all the diversion holes located on the same diversion baffle are evenly spaced on the diversion baffle.

8. The heat exchanger according to claim 4, characterized in that The heat exchanger further comprises a water outlet main pipe, and the water outlet main pipe connects the outlet ends of all the heat exchange tubes.

9. An outdoor unit, characterized in that: The heat exchanger comprises the heat exchanger described in any one of claims 1 to 8.

10. An air conditioner, characterized in that: The outdoor unit includes the outdoor unit according to claim 9.

11. A defrost drainage control method for an air conditioner according to claim 10, characterized in that: The control method includes: In the defrost mode, when the power is turned on for the first time or when the defrost time is greater than the first preset time, and the high pressure of the refrigeration system in the air conditioner is greater than or equal to the first preset pressure, and the temperature change on the surface of the heat exchange tube of the outdoor unit is positive within the first target time period, the heat exchange fan of the outdoor unit is controlled to rotate in the opposite direction compared to the heating mode, so that the heat exchange fan blows the condensed water droplets.

12. The defrost drainage control method according to claim 11, characterized in that: The controlling the heat exchange fan of the outdoor unit to rotate in the reverse direction compared to the heating mode includes: The heat exchange fan of the outdoor unit is controlled to rotate in the reverse direction at the highest operating frequency compared to the heating mode.

13. The defrost drainage control method according to claim 11, characterized in that: When exiting the defrost mode, or when the heat exchange fan continuously operates at the highest operating frequency for the second preset time, or when the temperature of the surface of the outdoor unit heat exchange tube is lower than the preset temperature within the second target time period, the heat exchange fan is controlled to stop rotating in the reverse direction.

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