Air exhaust pipeline anti-blocking method and device, air conditioner and storage medium

Abstract

The present disclosure provides an air exhaust pipeline anti-blocking method and device, an air conditioner and a storage medium. The indoor temperature, the indoor humidity, the outdoor temperature and the inner wall temperature of the inner wall of the air conditioner air exhaust pipeline are obtained. The condensation temperature is calculated according to the indoor temperature and the indoor humidity. If the inner wall temperature is less than the condensation temperature, the operation of the air conditioner exhaust fan is controlled according to the indoor humidity and the outdoor temperature. The present disclosure can effectively prevent the air conditioner air exhaust pipeline from being blocked.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of air conditioner control, and in particular to an exhaust duct anti-blocking method and device, an air conditioner, and a computer readable storage medium. BACKGROUND

[0002] Nowadays, most of the exhaust ducts are made of thin plastic material without thermal insulation layer for the convenience of penetrating the wall. In the low-temperature outdoor environment in winter, the exhaust duct is prone to condensation and frosting and icing, and even blocking, which seriously affects the ventilation effect and reliable use of the exhaust function.

[0003] In the existing prevention technology, the exhaust function is no longer operated when the outdoor temperature is below 0°C, which seriously limits the use range of the exhaust function; heating elements are used to heat the exhaust duct to increase the pipe wall temperature at low temperature; and the condensation is prevented by adjusting the exhaust volume.

[0004] The existing exhaust duct anti-blocking methods cannot effectively prevent the blocking of the exhaust duct caused by condensation, frosting and icing. SUMMARY

[0005] Embodiments of the present disclosure provide an exhaust duct anti-blocking method, device, air conditioner and computer readable storage medium, which aims to effectively prevent the blocking of the air conditioner exhaust duct.

[0006] In a first aspect, embodiments of the present disclosure provide an exhaust duct anti-blocking method, comprising:

[0007] obtaining an indoor temperature, an indoor humidity, an outdoor temperature and an inner wall temperature of an inner wall of an air conditioner exhaust duct;

[0008] calculating a condensation temperature according to the indoor temperature and the indoor humidity;

[0009] if the inner wall temperature is less than the condensation temperature, controlling an air conditioner exhaust fan to operate according to the indoor humidity and the outdoor temperature.

[0010] In a second aspect, embodiments of the present disclosure provide an exhaust duct anti-blocking device, comprising:

[0011] an obtaining module configured to obtain an indoor temperature, an indoor humidity, an outdoor temperature and an inner wall temperature of an inner wall of an air conditioner exhaust duct;

[0012] a calculating module configured to calculate a condensation temperature according to the indoor temperature and the indoor humidity;

[0013] a control module configured to control an air conditioner exhaust fan to operate according to the indoor humidity and the outdoor temperature if the inner wall temperature is less than the condensation temperature.

[0014] In a third aspect, embodiments of the present disclosure provide an air conditioner, comprising a processor and a memory, the memory storing a plurality of instructions; the processor loads the instructions from the memory to execute the steps of the air exhaust duct anti-blocking method.

[0015] In a fourth aspect, embodiments of the present disclosure provide a computer-readable storage medium, comprising a processor and a memory, the memory storing a plurality of instructions; the processor loads the instructions from the memory to execute the steps of the air exhaust duct anti-blocking method.

[0016] The beneficial effects of embodiments of the present disclosure are as follows:

[0017] Compared with the air exhaust duct anti-blocking method in the prior art, in the present disclosure, the air conditioner can obtain the indoor temperature, the outdoor humidity, the outdoor temperature, and the inner wall temperature of the inner wall of the air exhaust duct, and then, when the inner wall temperature is less than the condensation temperature, the air conditioner exhaust fan can be controlled to operate according to the indoor humidity and the outdoor temperature. Therefore, the present disclosure can determine the condensation, frosting, and icing risks of the inner wall of the air exhaust duct according to multiple environmental temperatures and in combination with the inner wall temperature of the air exhaust duct and the condensation temperature in the room, and then, the air conditioner exhaust fan can be correspondingly controlled to operate, so that the condensation, frosting, and icing problems of the inner wall of the air exhaust duct are effectively alleviated, the air exhaust duct orifice blockage problem in the air conditioner heating mode is solved, the air exhaust performance of the air exhaust fan is improved, and then, the air conditioner heating performance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] Figure 1 is a flowchart provided in the embodiments of the present disclosure;

[0020] Figure 2 is a first schematic diagram of the air exhaust duct blockage risk and prevention and control strategy provided in the embodiments of the present disclosure;

[0021] Figure 3 is a second schematic diagram of the air exhaust duct blockage risk and prevention and control strategy provided in the embodiments of the present disclosure;

[0022] Figure 4 is a schematic diagram of the inner wall of the air exhaust duct provided in the embodiments of the present disclosure;

[0023] Figure 5 is a schematic diagram of the condensation, frosting, and icing measured parameters of the air exhaust duct provided in the embodiments of the present disclosure;

[0024] Figure 6-1 is a first schematic diagram of actual measurement results of condensation, frosting and icing of an exhaust pipe provided in an embodiment of the present disclosure;

[0025] Figure 6-2 is a second schematic diagram of actual measurement results of condensation, frosting and icing of an exhaust pipe provided in an embodiment of the present disclosure;

[0026] Figure 6-3 is a third schematic diagram of actual measurement results of condensation, frosting and icing of an exhaust pipe provided in an embodiment of the present disclosure;

[0027] Figure 6-4 is a fourth schematic diagram of actual measurement results of condensation, frosting and icing of an exhaust pipe provided in an embodiment of the present disclosure;

[0028] Figure 7 is a structural schematic diagram of an exhaust pipe anti-blocking device provided in an embodiment of the present disclosure;

[0029] Figure 8 is a structural schematic diagram of an air conditioner provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present disclosure. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure. In the present disclosure, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing in the drawings. Meanwhile, "inner" and "outer" refer to the outline of the device. Meanwhile, in the description of the embodiments of the present disclosure, the terms "first", "second", etc. are only used for distinction and description, and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the embodiments of the present disclosure, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] It can be understood that the freezing point of water is 0℃ under standard atmospheric pressure. If the temperature of the contact object is lower than 0℃ and lower than the condensation temperature of the air, and the condensation temperature of the air is not lower than 0℃, condensation water will first form on the contact surface, and after a certain time of heat release, it will finally approach the temperature of the contact object to form solid ice. Or when the temperature of the contact object is lower than the condensation temperature of the air, and the condensation temperature is lower than 0℃ (i.e. the frost point temperature), frost will form on the contact surface. If the frost layer melts under the action of other heat sources, the defrosting water will continue to release heat and re-form ice.

[0032] From the above analysis, it can be seen that the outdoor low-temperature environment can be regarded as a huge cold source. When the inner wall surface of the exhaust air duct continuously cools and the temperature is lower than the condensation temperature of the exhaust air, condensation or frost will form in the duct. When the outdoor environment is lower than 0℃ or the temperature of the exhaust air duct inner wall is lower than 0℃, the condensation water or frost layer at this time is melted by the water from the relatively high-temperature exhaust air, and if it cannot be removed in time, it will continue to release heat and eventually form ice. With the accumulation and growth of the ice layer, the duct will eventually be blocked.

[0033] According to the above background technology, in the existing exhaust air duct prevention technology, the exhaust air function is not run below 0℃ outdoors, which severely limits the use range of the exhaust air function. Or, heating components are used to heat the exhaust air duct at low temperatures to raise the duct wall temperature, but there are problems of complex design and high cost. Or, the condensation risk of the exhaust air duct is evaluated by the size of the indoor and outdoor temperature difference or the size of the indoor condensation temperature and the outdoor temperature difference, and the condensation is prevented by adjusting the exhaust air volume. However, there are problems of obvious increase of exhaust air noise, change of user set gear, and limited increase of inner wall temperature at low temperature. If the inner wall temperature is still lower than the condensation temperature at high exhaust air gear, it is still difficult to avoid condensation.

[0034] Therefore, in order to effectively solve the problem of condensation, frost and ice formation in the exhaust air duct of the air conditioner affecting the exhaust performance of the exhaust fan, the present disclosure proposes an exhaust air duct anti-blocking method, device, air conditioner and computer readable storage medium.

[0035] Specifically, the exhaust air duct anti-blocking method in the present disclosure includes the following steps as shown in the figure: Figure 1

[0036] S10, acquiring indoor temperature, indoor humidity, outdoor temperature and inner wall temperature of the inner wall of the air conditioner exhaust air duct;

[0037] S20, calculating the condensation temperature according to the indoor temperature and the indoor humidity;

[0038] In this embodiment, the air conditioner can acquire the indoor temperature, outdoor humidity, outdoor temperature and inner wall temperature of the inner wall of the air conditioner exhaust air duct.

[0039] ​It should be noted that in the present embodiment, it can be understood that in the heating season, i.e. when the indoor air temperature is higher than the outdoor air temperature, the exhaust operation, the indoor air temperature tfi> the inner wall temperature twi> the outdoor air temperature tfo, when the inner wall surface has the risk of condensation, the exhaust pipe and the exhaust pipe opening have the risk of mixed condensation, i.e. the risk points of condensation or frost icing mainly concentrate in the exhaust port of the exhaust pipe and the exhaust pipe.

[0040] From the above analysis of the formation of ice and frost, whether ice is generated in the exhaust pipe depends on whether condensation or frost is generated, and is closely related to the outdoor environment temperature, the inner wall temperature of the exhaust pipe, and the operation time. For example, to prevent the exhaust pipe from icing, it is necessary to prevent or reduce the generation of condensation or frost in the exhaust pipe, to remove the condensation water in time, and to reasonably control the exhaust operation time to control the amount of condensation generated. In extremely low temperature, the condensation water may still form ice column at the exhaust port during the flow and discharge process, which forms a safety hazard, so it is necessary to limit the range of outdoor environment temperature for reliable operation of the exhaust.

[0041] Specifically, for example, as shown in Figure 2 The higher the indoor condensation temperature, the easier the condensation; the greater the temperature difference between the indoor condensation temperature and the inner wall surface temperature of the exhaust pipe, the higher the indoor relative humidity, the greater the moisture content, and the longer the operation time, the more serious the condensation in the exhaust pipe, and the higher the risk of frost icing under low temperature. Therefore, in combination with the analysis of the formation of ice and frost, the following anti-condensation and anti-icing control logic is designed. When the outdoor air temperature is greater than 0°C, the exhaust pipe has the risk of condensation, but there is no risk of icing and frost. When the outdoor air temperature is less than 0°C, there is a risk of condensation, frost, and icing, and the air conditioner can adopt corresponding blocking prevention and control means and strength under different risk conditions.

[0042] Therefore, the prevention and control logic design in the present disclosure can not only cope with the condensation, frost, and icing of the inner wall surface of the exhaust pipe, but also prevent the condensation, frost, and icing risk caused by the backflow of the air flow at the pipe opening.

[0043] In step S30, if the inner wall temperature is less than the condensation temperature, the operation of the air conditioner exhaust fan is controlled according to the indoor humidity and the outdoor temperature.

[0044] In the present embodiment, if the indoor wall temperature is less than the condensation temperature in the room, i.e. there is condensation on the inner wall of the exhaust pipe, the air conditioner can control the operation of the exhaust fan to effectively alleviate or eliminate the condensation phenomenon on the inner wall of the exhaust pipe.

[0045] Compared with the air exhaust pipe anti-blocking method in the prior art, in the present disclosure, the air conditioner can acquire the indoor temperature, the outdoor humidity, the outdoor temperature, and the inner wall temperature of the inner wall of the air conditioner air exhaust pipe. Then, when the inner wall temperature is less than the condensation temperature, the air conditioner exhaust fan operation can be controlled according to the indoor humidity and the outdoor temperature. Therefore, the present disclosure can judge the condensation, frosting, and icing risks of the inner wall of the air exhaust pipe according to multiple environmental temperatures, in combination with the inner wall temperature of the air exhaust pipe and the condensation temperature in the room, and then correspondingly control the operation of the air conditioner exhaust fan, so that the condensation, frosting, and icing problems of the inner wall of the air exhaust pipe are effectively alleviated, the air exhaust pipe orifice blocking problem in the air conditioner heating mode is solved, the air exhaust and ventilation performance of the exhaust fan is improved, and then the air conditioner heating performance is improved.

[0046] In an embodiment, the above S30, “if the inner wall temperature is less than the condensation temperature, the air conditioner exhaust fan operation is controlled according to the indoor humidity and the outdoor temperature”, can include:

[0047] S301, if the inner wall temperature is less than the condensation temperature, the running time of the air conditioner exhaust fan is controlled according to the indoor humidity and the outdoor temperature;

[0048] S302, the running speed of the air conditioner exhaust fan is adjusted according to the running time and the inner wall temperature.

[0049] In the present embodiment, when the air conditioner detects that the inner wall temperature is less than the condensation temperature, that is, there is a condensation risk (or frosting and / or icing) of the inner wall of the air exhaust pipe, the air conditioner can control the running time of the air conditioner exhaust fan according to the indoor humidity and the outdoor temperature.

[0050] Further, the air conditioner can adjust the running speed of the exhaust fan according to the running time of the exhaust fan and the inner wall temperature of the inner wall of the air exhaust pipe.

[0051] For example, in the present embodiment, the running time and the running speed can positively change, that is, if the air conditioner shortens the running time of the exhaust fan, the running speed of the exhaust fan can be reduced when the inner wall temperature is lower than the condensation temperature in the room, so as to alleviate the condensation, frosting, and icing of the inner wall of the air exhaust pipe and the orifice (it can be understood that the longer the running time of the exhaust fan and the higher the running speed, the greater the possibility of condensation, frosting, and / or icing of the inner wall of the air exhaust pipe and the orifice).

[0052] Further, the above S301, “if the inner wall temperature is less than the condensation temperature, the running time of the air conditioner exhaust fan is controlled according to the indoor humidity and the outdoor temperature”, can include:

[0053] S3011, if the inner wall temperature is less than the condensation temperature, the relative humidity threshold in the room is acquired according to the inner wall temperature and the condensation temperature.

[0054] S3012, if the outdoor temperature is greater than the preset temperature threshold, control the running duration of the exhaust fan according to the indoor humidity and the relative humidity threshold.

[0055] S3013, if the outdoor temperature is less than or equal to the preset temperature threshold, control the running duration of the internal exhaust fan of the air conditioner according to the indoor humidity, the relative humidity threshold, and in combination with the condensation temperature.

[0056] In this embodiment, as Figure 3 shown, when the air conditioner detects that the inner wall temperature twi is less than the indoor condensation temperature T 室内露点 at that time, as Figure 3 shown by the parameters of serial numbers 5 to 16 in 室内露点 , there is a corresponding indoor relative humidity threshold RHi for the temperature difference value between the inner wall temperature twi and the condensation temperature T

[0057] On this basis, if the outdoor temperature tfo is greater than the preset temperature threshold (such as °C), the risk of mixed condensation on the inner wall surface and the inner pipe nozzle of the exhaust duct is high, but there is no risk of icing, unless there is a large temperature drop. At this time, condensation on the inner wall surface of the exhaust duct can be mainly prevented and icing can be weakly prevented.

[0058] In a specific embodiment, as Figure 3 shown, when the outdoor temperature tfo > °C, if the temperature difference value (twi – T 室内露点 ) between the inner wall temperature twi and the condensation temperature T 室内露点 ) > a1 °C and the indoor humidity RH < the relative humidity threshold RH1, the running duration of the exhaust fan can be adjusted to x4 and the shutdown duration to y4. If (twi – T 室内露点 ) > a1 °C and the indoor humidity RH ≥ the relative humidity threshold RH1, the running duration of the exhaust fan can be adjusted to x5 and the shutdown duration to y5; if (twi – T 室内露点 ) < a1 °C and the indoor humidity RH < the relative humidity threshold RH2, the running duration of the exhaust fan can be adjusted to x6 and the shutdown duration to y6. If (twi – T 室内露点 ) < a1 °C and the indoor humidity RH ≥ the relative humidity threshold RH2, the running duration of the exhaust fan can be adjusted to x7 and the shutdown duration to y7.

[0059] It can be understood that the greater the temperature difference value between the inner wall temperature twi and the condensation temperature T 室内露点 , the higher the indoor relative humidity, the greater the moisture content, the longer the running time, and the more serious the condensation in the exhaust duct. Therefore, in order to alleviate the blockage of the exhaust fan, the air conditioner can shorten the running duration of the exhaust fan. For example, x4 < x6, x5 < x7, and x4 > x5, x6 > x7.

[0060] When the outdoor temperature T1℃≤tfo≤0℃ and T 室内露点 ≥0℃ (wherein, T1 represents the lowest outdoor ambient temperature at which the exhaust fan can operate), the exhaust duct inner wall and the tube-in-tube orifice mixed condensation risk is high, and the outdoor air temperature is lower than 0, the water accumulation icing and the orifice icing risk is great, and strong prevention and control can be carried out: if the temperature difference (twi-T 室内露点 ) between the inner wall temperature twi and the condensation temperature T 室内露点 )>a2℃ and the indoor humidity RH<relative humidity threshold RH3, the operation time of the exhaust fan can be adjusted to x8, and the shutdown time is y8, if (twi-T 室内露点 )>a1℃ and the indoor humidity RH≥relative humidity threshold RH3, the operation time of the exhaust fan can be adjusted to x9, and the shutdown time is y9; if (twi-T 室内露点 )<a2℃ and the indoor humidity RH<relative humidity threshold RH4, the operation time of the exhaust fan can be adjusted to x10, and the shutdown time is y10, if (twi-T 室内露点 )<a2℃ and the indoor humidity RH≥relative humidity threshold RH4, the operation time of the exhaust fan can be adjusted to x11, and the shutdown time is y11.

[0061] Wherein, similarly, x8<x10, x9<x11 and x8>x9, x10>x11.

[0062] When the outdoor temperature T1℃≤tfo≤0℃ and T 室内露点 <0℃, the exhaust duct inner wall and the tube-in-tube orifice mixed condensation risk is high, and the frost and icing risk is great, and strong prevention and control can be carried out: if the temperature difference (twi-T 室内露点 ) between the inner wall temperature twi and the condensation temperature T 室内露点 )>a3℃ and the indoor humidity RH<relative humidity threshold RH5, the operation time of the exhaust fan can be adjusted to x12, and the shutdown time is y12, if (twi-T 室内露点 )>a3℃ and the indoor humidity RH≥relative humidity threshold RH5, the operation time of the exhaust fan can be adjusted to x13, and the shutdown time is y13; if (twi-T 室内露点 )<a3℃ and the indoor humidity RH<relative humidity threshold RH6, the operation time of the exhaust fan can be adjusted to x14, and the shutdown time is y14, if (twi-T 室内露点 )<a3℃ and the indoor humidity RH≥relative humidity threshold RH6, the operation time of the exhaust fan can be adjusted to x15, and the shutdown time is y15.

[0063] Wherein, similarly, x12<x14, x13<x15 and x12>x13, x14>x15.

[0064] After S20, "calculating the condensation temperature according to the indoor temperature and the indoor humidity", the method can further comprise:

[0065] S40, if the indoor wall temperature is greater than the condensation temperature and the outdoor temperature is less than or equal to a preset temperature threshold, controlling the exhaust fan to operate according to a running time corresponding to the condensation temperature;

[0066] S50, if the indoor wall temperature is greater than the condensation temperature and the outdoor temperature is greater than the preset temperature threshold, controlling the exhaust fan to operate according to a preset running time.

[0067] In the embodiment, when the indoor wall temperature twi is greater than the condensation temperature T 室内露点 , it means that the indoor wall surface of the exhaust duct will not condense, but if the outdoor temperature T1℃≤tfo≤0℃ (i.e. the preset temperature threshold in the embodiment), that is, the outdoor temperature tfo is lower than 0, there is a risk of condensation icing caused by air mixing / cold air backflow at the exhaust outlet, and a risk of condensation icing at the exhaust outlet, and the exhaust fan can be controlled at a medium intensity to prevent water icing and heat absorption icing, as shown in the following table. Figure 3 When the outdoor temperature T1℃≤tfo≤0℃ and T 室内露点 ≥0℃, the indoor wall surface of the exhaust duct will not condense, and the outdoor temperature is lower than 0, which means that there is a risk of frost blocking at the exhaust outlet caused by air mixing / cold air backflow, and the exhaust fan can be controlled at a medium intensity to prevent frost blocking at the exhaust duct: the running time of the exhaust fan can be adjusted to x2 and the shutdown time to y2, and when the outdoor temperature T1℃≤tfo≤0℃ and T 室内露点 <0℃, the running time of the exhaust fan can be adjusted to x3 and the shutdown time to y3.

[0068] When the indoor wall temperature twi is greater than the condensation temperature T 室内露点 , if tfo>0℃, it means that the indoor wall surface of the exhaust duct is higher than the condensation temperature, and the outdoor temperature is lower than the condensation temperature, the indoor wall surface does not condense, but there is a possibility of mixed condensation of backflow air, and the outdoor temperature is greater than 0, which means that there is no risk of icing, and natural convection evaporation can be used, and the exhaust fan can be controlled at a weak intensity to prevent mixed condensation and prevent temperature drop icing: the running time of the exhaust fan can be adjusted to x1 and the shutdown time to y1.

[0069] After S20, "calculating the condensation temperature according to the indoor temperature and the indoor humidity", the method can further comprise:

[0070] S60, if the outdoor temperature is greater than the condensation temperature, comparing the outdoor temperature with a preset minimum ambient temperature threshold;

[0071] S70, if the outdoor temperature is greater than the preset minimum ambient temperature threshold, controlling the exhaust fan to operate continuously;

[0072] S80, if the outdoor temperature is less than the preset minimum ambient temperature threshold, controlling the exhaust fan to stop.

[0073] In the embodiment, as shown in Figure 3 According to the above description, the preset minimum ambient temperature threshold T1 represents the minimum outdoor ambient temperature at which the exhaust fan can operate. If the outdoor temperature tfo is lower than the preset minimum ambient temperature threshold T1, it means that the risk of frosting and icing is extremely high (the outdoor temperature is very likely to be lower than the condensation temperature of the indoor air, and the exhaust outlet is likely to drip water and form ice), and the strongest prevention and control can be performed at this time to prohibit the operation of the exhaust fan.

[0074] When the outdoor temperature tfo is greater than the condensation temperature T 室内露点 When the outdoor temperature tfo is lower than the preset minimum ambient temperature threshold T1 and the outdoor temperature tfo is higher than the preset maximum ambient temperature threshold T0, the outdoor temperature is higher than the dew point, and the inner wall temperature is higher than the outdoor air temperature, and there is no condensation in the pipe and the pipe outlet. The exhaust fan can be controlled to operate continuously according to the set program, wherein the preset maximum ambient temperature threshold T0 represents the highest outdoor ambient temperature at which the low-temperature exhaust prevention condensation and icing control is entered. When the temperature exceeds this temperature, there is no risk of condensation, frosting and icing in the exhaust pipe, and the exhaust pipe anti-blocking strategy in the embodiment does not need to be executed.

[0075] Therefore, in the embodiment, by presetting the control logic, the degree of condensation and icing risk under low-temperature conditions is judged, and the exhaust operation time is reasonably controlled, that is, the time and amount of condensation generated in the exhaust pipe, and the time of ice formation by heat release, thereby reducing the risk of ice blocking in the exhaust pipe. That is, the degree of condensation and icing risk is different, and the prevention strength is also different, that is, the operation time and shutdown time of the exhaust fan are also different.

[0076] In an embodiment, the "obtaining the inner wall temperature of the inner wall of the air conditioner exhaust duct" in S10 can include:

[0077] S101, obtaining an ambient temperature difference value between the indoor temperature and the outdoor temperature;

[0078] S102, calculating the inner wall temperature of the inner wall of the air conditioner exhaust duct according to the ambient temperature difference value and the temperature correction coefficient.

[0079] In the embodiment, the air conditioner can obtain the ambient temperature difference value (tfi-tfi) between the indoor temperature tfi and the outdoor temperature tfi, and then calculate the inner wall temperature twi of the air conditioner exhaust duct according to the ambient temperature difference value (tfi-tfi) and the temperature correction coefficient a.

[0080] Specifically, for example, twi = tfi - a(tfi - tfo), where 'a' is a coefficient related to the material properties of the exhaust duct (wall thickness, inner diameter, outer diameter, thermal conductivity), the heat transfer coefficient of the inner surface of the duct, the heat transfer coefficient of the outer surface of the duct, and the air velocity inside the exhaust duct and the outdoor air velocity. Given these material properties, the value of 'a' can be calculated or obtained by fitting experimental data. The above method for calculating the inner wall temperature twi conforms to the principles of heat transfer, providing a highly accurate inner wall temperature that meets engineering application requirements, thereby eliminating the need for an inner wall temperature sensor and reducing costs.

[0081] Before step S102 above, "calculating the inner wall temperature of the air conditioning exhaust duct based on the ambient temperature difference and the temperature correction coefficient," the following may also be included:

[0082] S103, Obtain the inner diameter of the exhaust duct and the air velocity inside the duct;

[0083] S104, Calculate the first heat transfer coefficient of the inner wall of the exhaust duct based on the inner diameter of the duct and the air velocity inside the duct;

[0084] S105, calculate the temperature correction coefficient based on the first heat transfer coefficient and the preset second heat transfer coefficient of the outer wall of the exhaust duct.

[0085] In this embodiment, as Figure 4 As shown, the inner diameter di of the exhaust duct is 0.058m, the outer diameter do is 0.06m, the duct length is l, the thermal conductivity of the duct wall material is λ, the heat transfer coefficient of the inner wall surface is hi (i.e., the first heat transfer coefficient in this embodiment), the heat transfer coefficient of the outer wall surface is ho (i.e., the second heat transfer coefficient in this embodiment), the comprehensive heat transfer coefficient of the outer surface of the duct is k, the indoor temperature is tfi, the outdoor temperature is tfo, the inner wall temperature is twi, and the outer wall temperature is two. Assuming that the heat transfer inside and outside the exhaust duct is stable, based on the equal heat transfer, the circular pipe heat transfer model can be used to obtain: hiπdil(tfi-twi)=kπdol(tfi-tfo).

[0086] Based on this, the temperature of the inner wall of the pipe

[0087] If the temperature correction factor is set Then twi = tfi - a(tfi - tfo).

[0088] The heat transfer coefficient of the outer surface of the pipe

[0089] It is evident that the inner wall temperature is closely related to the internal and external ambient temperatures, and is also affected by physical properties such as the heat transfer coefficients of the inner and outer walls of the pipe, the thermal conductivity of the pipe wall material, and the pipe diameter. Given that these physical properties are known or solvable, the temperature can be calculated.

[0090] The thermal resistance for convective heat transfer inside the duct is γsi = 0.286 (D0.25 / V0.8).

[0091] Based on this, when the exhaust fan is at low speed, the air velocity inside the duct is approximately 2.7 m / s, the inner diameter of the duct is D = di = 0.058 m, and the calculated thermal resistance is γsi(low speed) = 0.062783 (m2.℃) / W. Therefore, the heat transfer coefficient of the inner wall of the duct is hi(low speed) = 1 / γsi(low speed). When the exhaust fan is at high speed, the air velocity inside the duct is approximately 6.0 m / s, the inner diameter of the duct is D = di = 0.058 m, and the calculated thermal resistance is γsi(high speed) = 0.03351 (m2.℃) / W. Therefore, the heat transfer coefficient of the inner wall of the duct is hi(high speed) = 1 / γsi(high speed). The exhaust duct material is PVC, and the thermal conductivity λ of the duct wall material is taken as 0.14 W / (m.℃).

[0092] The external convective heat transfer coefficient of the duct is α = 1.163 × (10 + 6W0.5), where W is the annual average wind speed. It is evident that the calculated heat transfer coefficient of the duct's outer wall varies significantly under different wind speeds. Since the experiment was conducted on an enthalpy difference test bench, and according to the requirements of GB / T7725 for laboratory environments, the outdoor wind speed was taken as 2 m / s, meaning there is some forced convection on the outdoor side of the exhaust duct. Therefore, in this embodiment, the calculated heat transfer coefficient of the duct's outer wall is ho = α = 21.5 W / (m²·℃).

[0093] Based on the above parameters, the duct inner wall temperature twi can be calculated for different exhaust fan speeds: at low speed, twi = tfi - 0.547(tfi - tfo); at high speed, twi = tfi - 0.392(tfi - tfo). Therefore, in this embodiment, when the exhaust function is running, the unit can calculate the exhaust duct inner wall temperature twi after obtaining the indoor and outdoor temperatures. Moreover, the calculation comparison shows that when the exhaust fan is running at a low speed, the inner wall temperature is relatively lower, the condensation effect is relatively worse, and more attention needs to be paid to its control.

[0094] Due to factors such as deviations in the values ​​of physical properties and evaporation inside the pipe, there will be a certain discrepancy between the actual measurements and the calculated predictions. Figure 5 As shown, the measured value of the inner wall temperature deviates from the calculated value by less than 1°C, indicating high data regularity and consistency. Furthermore, the condensation phenomenon and pattern in the pipe during continuous exhaust operation are basically consistent with the expected judgment. Therefore, this embodiment can be applied to engineering calculations. In combination with the actual situation, the calculation results can be appropriately corrected to ensure operational reliability under adverse conditions.

[0095] In one specific embodiment, based on the exhaust duct anti-clogging strategy in the above embodiments, the reliability of low-windshield exhaust was verified at indoor temperatures of 20℃ / 14℃ and outdoor temperatures of -7℃: Due to the extremely high risk of condensation and icing, the exhaust operation entered an on / off control mode.Figure 6-1 and Figure 6-2 As shown in FIG. 8, during the 8h test, a small amount of condensation water adheres to the inner wall of the exhaust duct, and a small amount of ice forms, without the risk of blockage, as shown in FIG. 9. Figure 6-3 As shown in FIG. 10, only a small amount of condensation occurs in the exhaust duct, and Figure 6-4 As shown in FIG. 11, only a small amount of ice forms in the exhaust duct, and the anti-blocking strategy of the exhaust duct in the present disclosure can significantly improve the condensation, frosting, and icing problems of the exhaust duct.

[0096] The present embodiment also provides an anti-blocking device for an exhaust duct, which can be integrated in an air conditioner, for example, as shown in FIG. 12. Figure 7 The anti-blocking device for the exhaust duct can include:

[0097] An acquisition module 1001 is configured to acquire an indoor temperature, an indoor humidity, an outdoor temperature, and an inner wall temperature of an inner wall of an exhaust duct of an air conditioner.

[0098] A calculation module 1002 is configured to calculate a condensation temperature according to the indoor temperature and the indoor humidity.

[0099] A control module 1003 is configured to control an operation of an exhaust fan of the air conditioner according to the indoor humidity and the outdoor temperature if the inner wall temperature is less than the condensation temperature.

[0100] Optionally, the control module 1003 includes:

[0101] A control unit is configured to control a running duration of the exhaust fan of the air conditioner according to the indoor humidity and the outdoor temperature if the inner wall temperature is less than the condensation temperature.

[0102] An adjustment unit is configured to adjust a running speed of the exhaust fan of the air conditioner according to the running duration and the inner wall temperature.

[0103] Optionally, the control unit includes:

[0104] A first control sub-unit is configured to acquire a relative humidity threshold of an indoor environment according to the inner wall temperature and the condensation temperature if the inner wall temperature is less than the condensation temperature.

[0105] A second control sub-unit is configured to control the running duration of the exhaust fan according to the indoor humidity and the relative humidity threshold if the outdoor temperature is greater than a preset temperature threshold.

[0106] A third control sub-unit is configured to control the running duration of the exhaust fan of the air conditioner according to the indoor humidity and the relative humidity threshold, and in combination with the condensation temperature, if the outdoor temperature is less than or equal to the preset temperature threshold.

[0107] Optionally, the air exhaust pipeline anti-blocking device in the present disclosure further comprises:

[0108] The second control module is configured to, if the inner wall temperature is greater than the condensation temperature and the outdoor temperature is less than or equal to a preset temperature threshold, control the exhaust fan to operate according to an operation time length corresponding to the condensation temperature.

[0109] The third control module is configured to, if the inner wall temperature is greater than the condensation temperature and the outdoor temperature is greater than the preset temperature threshold, control the exhaust fan to operate according to a preset operation time length.

[0110] Optionally, the air exhaust pipeline anti-blocking device in the present disclosure further comprises:

[0111] The comparison module is configured to, if the outdoor temperature is greater than the condensation temperature, compare the outdoor temperature with a preset minimum ambient temperature threshold.

[0112] The fourth control module is configured to, if the outdoor temperature is greater than the preset minimum ambient temperature threshold, control the exhaust fan to continuously operate.

[0113] The fifth control module is configured to, if the outdoor temperature is less than the preset minimum ambient temperature threshold, control the exhaust fan to stop operating.

[0114] Optionally, the acquisition module 1001 comprises:

[0115] The first acquisition unit is configured to acquire an ambient temperature difference value between the indoor temperature and the outdoor temperature.

[0116] The first calculation unit is configured to calculate an inner wall temperature of an inner wall of the air conditioner exhaust pipeline according to the ambient temperature difference value and a temperature correction coefficient.

[0117] Optionally, the acquisition module 1001 comprises:

[0118] The second acquisition unit is configured to acquire an air pipe inner diameter of the exhaust pipeline and a pipe internal air speed.

[0119] The second calculation unit is configured to calculate a first heat transfer coefficient of an inner wall of the exhaust pipeline according to the air pipe inner diameter and the pipe internal air speed.

[0120] The third calculation unit is configured to calculate the temperature correction coefficient according to the first heat transfer coefficient and a preset second heat transfer coefficient of an outer wall of the exhaust pipeline.

[0121] The specific implementation of each operation can be referred to the foregoing embodiments, which will not be described here.

[0122] Correspondingly, the present disclosure further provides an air conditioner, as shown in Figure 8 ​Figure 8 A structure schematic diagram of an air conditioner is provided for the embodiments of the present disclosure. The air conditioner 1100 includes a processor 1101 having one or more processing cores, a memory 1102 having one or more computer readable storage media, and a computer program stored in the memory 1102 and executable on the processor. The processor 1101 is electrically connected to the memory 1102. Those skilled in the art can understand that the structure of the air conditioner shown in the figure does not constitute a limitation on the air conditioner, and can include more or fewer components than shown in the figure, or combine certain components, or different component arrangements.

[0123] The processor 1101 is the control center of the air conditioner 1100, and connects various parts of the air conditioner 1100 through various interfaces and lines. By running or loading the software program and / or unit stored in the memory 1102 and calling the data stored in the memory 1102, the processor 1101 performs various functions and processes data of the air conditioner 1100, thereby monitoring the air conditioner 1100 as a whole. The processor 1101 can be a processor CPU, a graphics processor GPU, a network processor (NP), etc., and can implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present disclosure.

[0124] In the embodiments of the present disclosure, the processor 1101 in the air conditioner 1100 loads the instructions corresponding to the processes of one or more application programs into the memory 1102, and runs the application programs stored in the memory 1102 by the processor 1101, thereby implementing various functions, for example:

[0125] obtaining an indoor temperature, an indoor humidity, an outdoor temperature, and an inner wall temperature of an inner wall of an air conditioner exhaust duct;

[0126] calculating a condensation temperature according to the indoor temperature and the indoor humidity;

[0127] if the inner wall temperature is less than the condensation temperature, controlling an air conditioner exhaust fan to operate according to the indoor humidity and the outdoor temperature.

[0128] The specific implementation of each operation can refer to the previous embodiments, which will not be described here.

[0129] Optionally, as shown in Figure 8 The air conditioner 1100 further includes a touch display screen 1103, a radio frequency circuit 1104, an audio circuit 1105, an input unit 1106, and a power supply 1107. The processor 1101 is electrically connected to the touch display screen 1103, the radio frequency circuit 1104, the audio circuit 1105, the input unit 1106, and the power supply 1107, respectively. Those skilled in the art can understand that Figure 8The air conditioner structure shown in the figure does not constitute a limitation on the air conditioner, and can include more or fewer components than shown, or combine certain components, or arrange different components.

[0130] The touch display screen 1103 can be used to display a graphical user interface and receive operation instructions generated by user acting on the graphical user interface. The touch display screen 1103 can include a display panel and a touch panel. The display panel can be used to display information input by the user or information provided to the user and various graphical user interfaces of the air conditioner, which can be composed of graphics, text, icons, videos and any combination thereof. Optionally, the display panel can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc. The touch panel can be used to collect touch operations of the user thereon or adjacent thereto (such as operations of the user using a finger, a stylus or any suitable object or accessory on or adjacent to the touch panel), and generate corresponding operation instructions, and the operation instructions execute corresponding programs. Optionally, the touch panel can include two parts of a touch detection system and a touch controller. The touch detection system detects the touch position of the user and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection system, and converts it into touch coordinates, and then sends it to the processor 1101, and can receive commands from the processor 1101 and execute them. The touch panel can cover the display panel, and when the touch panel detects a touch operation thereon or adjacent thereto, it transmits to the processor 1101 to determine the type of the touch event, and then the processor 1101 provides corresponding visual output on the display panel according to the type of the touch event. In the embodiments of the present disclosure, the touch panel and the display panel can be integrated into the touch display screen 1103 to realize input and output functions. However, in some embodiments, the touch panel and the touch panel can realize input and output functions as two independent components. That is, the touch display screen 1103 can also realize input functions as part of the input unit 1106.

[0131] The radio frequency circuit 1104 can be used to transceive radio frequency signals to establish wireless communication with a network device or other air conditioners, and transceive signals between the network device or other air conditioners.

[0132] The audio circuit 1105 can be used to provide an audio interface between the user and the air conditioner through a speaker and a microphone. The audio circuit 1105 can convert the received audio data into an electrical signal and transmit it to the speaker, which converts the electrical signal into a sound signal and outputs it. On the other hand, the microphone collects a sound signal and converts it into an electrical signal, which is received by the audio circuit 1105 and converted into audio data. The audio data is output to the processor 1101 for processing, and then transmitted to another air conditioner via the radio frequency circuit 1104, or output to the memory 1102 for further processing. The audio circuit 1105 can also include a headphone jack to provide communication between an external device and the air conditioner.

[0133] The input unit 1106 can be used to receive inputted numbers, character information or user feature information (such as fingerprints, iris, facial information, etc.), and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0134] The power supply 1107 is used to power the various components of the air conditioner 1100. Optionally, the power supply 1107 can be logically connected to the processor 1101 through a power management system, so that the power management system can manage charging, discharging and power consumption management, etc. The power supply 1107 can also include one or more DC or AC power sources, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, etc.

[0135] Although Figure 8 The air conditioner 1100 can also include a camera, a sensor, a wireless fidelity module, a Bluetooth module, etc., which are not described here.

[0136] In the above embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0137] Those of ordinary skill in the art can understand that all or part of the steps of the various methods of the above embodiments can be completed by instructions, or by instructions controlling related hardware, which can be stored in a computer readable storage medium and loaded and executed by a processor.

[0138] To this end, the embodiments of the present disclosure provide a computer readable storage medium, which stores a plurality of computer programs capable of being loaded by a processor to execute any of the air exhaust duct anti-blocking methods provided by the embodiments of the present disclosure. The computer program can execute the steps of the following air exhaust duct anti-blocking method:

[0139] Obtaining an indoor temperature, an indoor humidity, an outdoor temperature, and an inner wall temperature of an inner wall of an air conditioner exhaust duct;

[0140] calculate a dew point temperature according to the indoor temperature and the indoor humidity;

[0141] If the inner wall temperature is less than the dew point temperature, control an air conditioner exhaust fan to operate according to the indoor humidity and the outdoor temperature.

[0142] The specific implementation of each operation can refer to the foregoing embodiments, which will not be described here again.

[0143] The computer readable storage medium can include a read only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0144] Due to the computer program stored in the computer readable storage medium, any one of the air exhaust pipeline anti-blocking methods provided by the embodiments of the present disclosure can be executed, thus the beneficial effects of any one of the air exhaust pipeline anti-blocking methods provided by the embodiments of the present disclosure can be achieved, which will be described in detail in the foregoing embodiments, and will not be described here again.

[0145] In the air exhaust pipeline anti-blocking device, the computer readable storage medium, and the air conditioner, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can refer to the related description of other embodiments. It can be clearly understood by those skilled in the art that, for the convenience and brevity of description, the specific working process of the air exhaust pipeline anti-blocking device, the computer readable storage medium, the computer program product, the air conditioner, and the corresponding units thereof described above and the beneficial effects brought by them can refer to the description of the air exhaust pipeline anti-blocking method in the foregoing embodiments, and will not be described here again.

[0146] The foregoing provides a detailed description of the air exhaust pipeline anti-blocking method, device, air conditioner, and computer readable storage medium provided by the embodiments of the present disclosure. The principles and implementation manners of the present disclosure are described by applying specific examples in this paper. The foregoing description of the embodiments is only used to help understand the method and core idea of the present disclosure; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present disclosure. In conclusion, the content of the specification should not be understood as a limitation of the present disclosure.

Claims

1. A method for preventing blockage in exhaust ducts, characterized in that, include: Acquire indoor temperature, indoor humidity, outdoor temperature, and the inner wall temperature of the air conditioning exhaust duct. Calculate the condensation temperature based on the indoor temperature and the indoor humidity; If the inner wall temperature is lower than the condensation temperature, the air conditioner exhaust fan is controlled to operate based on the indoor humidity and the outdoor temperature. If the inner wall temperature is lower than the condensation temperature, then controlling the operation of the air conditioner exhaust fan based on the indoor humidity and the outdoor temperature includes: If the inner wall temperature is lower than the condensation temperature, the operating time of the air conditioner exhaust fan is controlled according to the indoor humidity and the outdoor temperature. The operating speed of the air conditioner exhaust fan is adjusted according to the running time and the inner wall temperature. If the inner wall temperature is lower than the condensation temperature, then controlling the operating time of the air conditioner exhaust fan based on the indoor humidity and the outdoor temperature includes: If the inner wall temperature is lower than the condensation temperature, then the indoor relative humidity threshold is obtained based on the inner wall temperature and the condensation temperature. If the outdoor temperature is greater than the preset temperature threshold, the running time of the exhaust fan is controlled according to the indoor humidity and the relative humidity threshold. If the outdoor temperature is less than or equal to a preset temperature threshold, the operating time of the air conditioner exhaust fan is controlled based on the indoor humidity and the relative humidity threshold, combined with the condensation temperature.

2. The method for preventing blockage of exhaust ducts according to claim 1, characterized in that, After calculating the condensation temperature based on the indoor temperature and the indoor humidity, the process includes: If the inner wall temperature is greater than the condensation temperature, and the outdoor temperature is less than or equal to a preset temperature threshold, then the exhaust fan is controlled to operate according to the running time corresponding to the condensation temperature. If the inner wall temperature is greater than the condensation temperature, and the outdoor temperature is greater than the preset temperature threshold, then the exhaust fan is controlled to operate according to the preset running time.

3. The method for preventing blockage of exhaust ducts according to claim 1, characterized in that, After calculating the condensation temperature based on the indoor temperature and the indoor humidity, the method further includes: If the outdoor temperature is greater than the condensation temperature, then compare the outdoor temperature with a preset minimum ambient temperature threshold. If the outdoor temperature is greater than the preset minimum ambient temperature threshold, the exhaust fan will be controlled to run continuously. If the outdoor temperature is lower than the preset minimum ambient temperature threshold, the exhaust fan will be shut down.

4. The method for preventing blockage of exhaust ducts according to claim 1, characterized in that, Obtaining the inner wall temperature of the air conditioning exhaust duct includes: Obtain the ambient temperature difference between the indoor temperature and the outdoor temperature; The inner wall temperature of the air conditioning exhaust duct is calculated based on the ambient temperature difference and the temperature correction factor.

5. The method for preventing blockage of exhaust ducts according to claim 4, characterized in that, Before calculating the inner wall temperature of the air conditioning exhaust duct based on the ambient temperature difference and the temperature correction coefficient, the following steps are included: Obtain the inner diameter of the exhaust duct and the air velocity inside the duct; Calculate the first heat transfer coefficient of the inner wall of the exhaust duct based on the inner diameter of the duct and the air velocity inside the duct; The temperature correction coefficient is calculated based on the first heat transfer coefficient and the preset second heat transfer coefficient of the outer wall of the exhaust duct.

6. A device for preventing blockage in exhaust ducts, characterized in that, include: The acquisition module is used to acquire indoor temperature, indoor humidity, outdoor temperature, and the inner wall temperature of the air conditioning exhaust duct. The calculation module is used to calculate the condensation temperature based on the indoor temperature and the indoor humidity; The control module is used to control the operation of the air conditioner exhaust fan based on the indoor humidity and the outdoor temperature if the inner wall temperature is lower than the condensation temperature. If the inner wall temperature is lower than the condensation temperature, then controlling the operation of the air conditioner exhaust fan based on the indoor humidity and the outdoor temperature includes: If the inner wall temperature is lower than the condensation temperature, the operating time of the air conditioner exhaust fan is controlled according to the indoor humidity and the outdoor temperature. The operating speed of the air conditioner exhaust fan is adjusted according to the running time and the inner wall temperature. If the inner wall temperature is lower than the condensation temperature, then controlling the operating time of the air conditioner exhaust fan based on the indoor humidity and the outdoor temperature includes: If the inner wall temperature is lower than the condensation temperature, then the indoor relative humidity threshold is obtained based on the inner wall temperature and the condensation temperature. If the outdoor temperature is greater than the preset temperature threshold, the running time of the exhaust fan is controlled according to the indoor humidity and the relative humidity threshold. If the outdoor temperature is less than or equal to a preset temperature threshold, the operating time of the air conditioner exhaust fan is controlled based on the indoor humidity and the relative humidity threshold, combined with the condensation temperature.

7. An air conditioner, characterized in that, It includes a processor and a memory, wherein the memory stores a computer program that, when executed by the processor, causes the processor to perform the steps of any one of the methods described in claims 1 to 5.

8. A computer-readable storage medium, characterized in that, It includes a computer program that, when run on an electronic device, causes the electronic device to perform the steps of any of the methods described in claims 1 to 5.

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