A method for controlling the introduction of fresh air into a washing machine and the washing machine

Abstract

This invention provides a method for controlling the introduction of fresh air into a washing machine and a washing machine in the field of washing machine technology. The method includes: during a drying cycle, acquiring the humidity of the external environment outside the washing drum and determining whether the humidity meets the conditions for introducing fresh air; if the humidity does not meet the conditions, controlling the fresh air introduction device to close and continuing the drying cycle; if the humidity meets the conditions, acquiring the temperature inside the washing drum and controlling the opening and closing of the fresh air introduction device based on the temperature inside the washing drum, and continuing the drying cycle. This invention introduces fresh air during the drying cycle to condense the hot and humid air inside the washing drum, further reducing the outlet air temperature of the washing drum and improving drying efficiency. Simultaneously, by detecting the ambient humidity during the introduction of fresh air, it avoids reducing drying efficiency due to insufficient humidity of the fresh air introduced into the washing drum.

Description

Technical Field

[0001] This invention relates to the field of washing machine technology, and in particular to a method for controlling the introduction of fresh air into a washing machine and a washing machine itself. Background Technology

[0002] With the advancement of technology, washer-dryers and clothes dryers with drying functions have gradually become daily necessities. Currently, to improve drying efficiency, an outer drum condenser is added to the original drying cycle. The main method is to install a condensate inlet pipe at the top of the outer drum, allowing the condensate to flow down the inner wall of the rear of the outer drum and condense upon contact with the hot and humid air.

[0003] However, when hot and humid air comes into contact with condensate at the top of the washing drum, it consumes a lot of condensate in order to displace the heat. This not only wastes water resources but also reduces the drying efficiency. Summary of the Invention

[0004] To overcome the problem in related technologies that a large amount of condensate is consumed when the outer drum condenses hot and humid air, this invention proposes a fresh air introduction control method for a washing machine and a washing machine.

[0005] The first aspect of this invention provides a method for controlling the introduction of fresh air into a washing machine, the method comprising:

[0006] During the drying process, the humidity of the external environment outside the washing drum is obtained to determine whether the humidity of the external environment meets the conditions for the introduction of fresh air.

[0007] If the external humidity does not meet the requirements for fresh air introduction, the fresh air introduction device will be shut down, and the drying process will continue.

[0008] If the external humidity meets the requirements for fresh air introduction, the internal temperature of the washing drum is obtained, and the opening and closing of the fresh air introduction device is controlled according to the internal temperature of the washing drum, while the drying program continues.

[0009] In the above technical solution, the method for controlling the opening and closing of the fresh air introduction device based on the internal ambient temperature of the washing drum includes:

[0010] When the ambient temperature inside the washing drum is greater than or equal to the first preset temperature value, the fresh air introduction device is turned on.

[0011] When the ambient temperature inside the washing drum is lower than the first preset temperature value, the fresh air introduction device is shut off.

[0012] In the above technical solution, the method for controlling the opening of the fresh air introduction device includes:

[0013] Turn on the fresh air fan and fresh air inlet valve, and obtain the ambient temperature outside the washing drum. Control the opening degree of the fresh air inlet valve of the fresh air inlet device according to the ambient temperature outside the washing drum.

[0014] In the above technical solution, the opening degree of the fresh air introduction valve includes n opening degrees from small to large, namely X1, X2, X3...Xn;

[0015] The outside fresh air temperature has n temperature levels, ranging from low to high: T1, T2, T3...Tn;

[0016] Where X1 corresponds to T1, X2 corresponds to T2, X3 corresponds to T3, ..., Xn corresponds to Tn;

[0017] Methods for controlling the opening of the fresh air inlet valve based on the external ambient temperature of the washing drum include:

[0018] The valve opening is determined based on the outside fresh air temperature level, and the opening of the fresh air inlet valve is controlled based on the determined valve opening.

[0019] In the above technical solution, the method for controlling the opening and closing of the fresh air introduction device based on the internal ambient temperature of the washing drum also includes:

[0020] The ambient temperature outside the washing drum is acquired at preset intervals, and the opening degree of the fresh air introduction valve is controlled according to the ambient temperature outside the washing drum.

[0021] In the above technical solutions, the methods for determining whether the conditions for introducing fresh air are met include:

[0022] When the ambient humidity outside the washing drum is lower than the preset ambient humidity, it is determined that the ambient humidity outside the washing drum meets the conditions for fresh air introduction.

[0023] If the ambient humidity outside the washing drum is greater than or equal to the preset ambient humidity, it is determined that the ambient humidity outside the washing drum does not meet the conditions for fresh air introduction.

[0024] A second aspect of this invention provides a washing machine, wherein the washing machine can employ the aforementioned fresh air introduction control method, and the washing machine includes:

[0025] A washing drum includes an outer drum and an inner drum pivotally disposed within the outer drum. Water guide ribs are provided on the rear inner wall of the outer drum.

[0026] The external circulation drying air duct has an air inlet connected to the outer cylinder and an air outlet connected to the inner cylinder.

[0027] Water injection pipe, used to inject water into the outer cylinder and the external circulation drying air duct;

[0028] The fresh air introduction device is located on the outer cylinder and connected to the outer cylinder. The fresh air introduction device includes a fresh air inlet and a fresh air outlet, as well as a fresh air fan located between the fresh air inlet and the fresh air outlet.

[0029] The fresh air introduction device also includes fresh air introduction valves located at the fresh air inlet and / or fresh air outlet;

[0030] The first humidity sensor is used to detect the humidity of the external environment of the washing drum.

[0031] The first temperature sensor is used to detect the ambient temperature inside the washing drum.

[0032] The controller is used to control the opening and closing of the fresh air fan and the fresh air inlet valve based on the external humidity and internal temperature of the washing drum.

[0033] The first temperature sensor is located on the external circulation drying air duct.

[0034] In the above technical solution, the fresh air introduction device also includes a fresh air introduction valve located at the fresh air inlet and / or fresh air outlet;

[0035] The washing machine also includes:

[0036] The second temperature sensor is used to detect the ambient temperature outside the washing drum.

[0037] The controller is used to control the opening degree of the fresh air inlet valve based on the ambient temperature outside the washing drum.

[0038] In the above technical solution, the fresh air introduction device includes:

[0039] The fresh air housing has a fresh air cavity inside and fresh air inlets and outlets on both sides that communicate with the fresh air cavity.

[0040] The bracket is fixed at the fresh air inlet, and the fresh air fan is fixedly connected to the side of the bracket facing the fresh air outlet.

[0041] The fan blades are located in the fresh air chamber and are connected to the fresh air fan.

[0042] The fresh air inlet valve is located at the fresh air outlet.

[0043] In the above technical solution, the fresh air introduction device is located at the top of the outer cylinder.

[0044] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0045] This invention provides a method for controlling the introduction of fresh air into a washing machine. By introducing fresh air during the drying cycle, the humid and hot air inside the washing drum is condensed, reducing the outlet air temperature of the washing drum and improving drying efficiency. At the same time, when introducing fresh air, the ambient humidity is detected to prevent the humidity of the fresh air introduced into the washing drum from not meeting the requirements and thus reducing drying efficiency. Attached Figure Description

[0046] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0047] Figure 1 Control flow of an embodiment of the fresh air introduction control method for washing machines of the present invention Figure 1 ;

[0048] Figure 2 Control flow of an embodiment of the fresh air introduction control method for washing machines of the present invention Figure 2

[0049] Figure 3 This is a three-dimensional structural diagram of the outer drum in an embodiment of the washing machine of the present invention;

[0050] Figure 4 This is a schematic diagram of the internal structure of the outer drum in an embodiment of the washing machine of the present invention;

[0051] Figure 5 This is a three-dimensional structural schematic diagram of the fresh air introduction device in an embodiment of the washing machine of the present invention;

[0052] Figure 6 This is a schematic diagram of the internal structure of the fresh air introduction device in an embodiment of the washing machine of the present invention.

[0053] Wherein: 1-outer cylinder; 2-external circulation drying air duct; 3-fresh air introduction device; 31-fresh air fan; 32-fresh air introduction valve; 33-fresh air shell; 34-support; 35-fan blade. Detailed Implementation

[0054] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0055] Currently available washing machines consume a large amount of condensate water when condensing hot and humid air in the outer drum during the drying process. This invention provides a method for controlling the introduction of fresh air into a washing machine. By introducing fresh air during the drying cycle, the hot and humid air at the top of the outer drum is condensed, further reducing the outlet temperature of the outer drum and improving drying efficiency. Simultaneously, the ambient humidity is detected during the introduction of fresh air to prevent the humidity of the fresh air introduced into the outer drum from being unsuitable and reducing drying efficiency.

[0056] The following is in conjunction with the appendix Figure 1-6 The technical solution of this embodiment is described in detail. Unless otherwise specified, the following implementation methods and embodiments can be combined with each other.

[0057] Example

[0058] like Figure 1 and Figure 2 As shown, the first aspect of this embodiment proposes a method for controlling the introduction of fresh air into a washing machine. The washing machine includes a fresh air introduction device and a washing drum. The washing drum includes an outer drum, and the fresh air introduction device is connected to the outer drum of the washing drum. The method includes:

[0059] During the drying process, the humidity of the external environment outside the washing drum is obtained to determine whether the humidity of the external environment meets the conditions for the introduction of fresh air.

[0060] If the external humidity does not meet the requirements for fresh air introduction, the fresh air introduction device will be shut down, and the drying process will continue.

[0061] If the external humidity meets the requirements for fresh air introduction, the internal temperature of the washing drum is obtained, and the opening and closing of the fresh air introduction device is controlled according to the internal temperature of the washing drum, while the drying program continues.

[0062] In this embodiment of the invention, when the washing machine is drying clothes, fresh air is introduced into the washing drum through a fresh air introduction device. This can condense the hot and humid air at the top of the outer drum, further reducing the outlet temperature of the outer drum and improving drying efficiency. At the same time, when introducing fresh air, the ambient humidity is detected to avoid the fresh air introduced into the outer drum not meeting the humidity requirements, which would reduce drying efficiency. Furthermore, when the ambient humidity meets the requirements, the internal ambient temperature of the washing drum is obtained to prevent the fresh air from entering too early and affecting the temperature rise inside the washing drum.

[0063] Specifically, methods for controlling the opening and closing of the fresh air intake device based on the internal ambient temperature of the washing drum include:

[0064] When the ambient temperature inside the washing drum is greater than or equal to the first preset temperature value, the fresh air introduction device is turned on.

[0065] When the ambient temperature inside the washing drum is lower than the first preset temperature value, the fresh air introduction device is shut off.

[0066] The reason why the fresh air introduction device is only turned on when the ambient temperature inside the washing drum is greater than or equal to the first preset temperature value in this embodiment of the invention is that the fresh air introduction device can only be turned on after the rapid heating stage of drying has ended. If the fresh air introduction device is turned on too early, the temperature inside the washing drum will not rise, which will affect the drying efficiency of the washing machine.

[0067] Furthermore, methods for controlling the activation of the fresh air intake device include:

[0068] Turn on the fresh air fan and fresh air inlet valve, and obtain the ambient temperature outside the washing drum. Control the opening degree of the fresh air inlet valve of the fresh air inlet device according to the ambient temperature outside the washing drum.

[0069] In other words, in this embodiment of the invention, when introducing fresh air from the outside, the amount of fresh air to be introduced needs to be determined based on the ambient temperature.

[0070] Specifically, the opening degree of the fresh air inlet valve includes n opening degrees from small to large, namely X1, X2, X3...Xn;

[0071] The outside fresh air temperature has n temperature levels, ranging from low to high: T1, T2, T3...Tn;

[0072] Where X1 corresponds to T1, X2 corresponds to T2, X3 corresponds to T3, ..., Xn corresponds to Tn;

[0073] The opening degree of the fresh air inlet valve is controlled according to the ambient temperature outside the washing drum, including:

[0074] The valve opening is determined based on the outside fresh air temperature level, and the opening of the fresh air introduction valve is controlled based on the determined valve opening.

[0075] For example, valves with a diameter of 40mm are divided into 4 levels: 0 / 10 / 20 / 30 / 40, where 0 is fully closed and 40 is fully open; outdoor temperatures are divided into 4 levels: -20~0 / 0~20 / 20~40 / 40~60; the two are matched, that is, temperatures of -20~0 correspond to valve 0, and so on.

[0076] In other words, the lower the outside fresh air temperature, the less fresh air is introduced; the higher the outside fresh air temperature, the more fresh air is introduced. This avoids the lower outside fresh air temperature from significantly affecting the temperature of the drying airflow inside the drum.

[0077] In any of the above embodiments, the method for controlling the opening and closing of the fresh air introduction device based on the internal ambient temperature of the washing drum further includes:

[0078] The ambient temperature outside the washing drum is acquired at preset intervals, and the opening degree of the fresh air introduction valve is controlled according to the ambient temperature outside the washing drum.

[0079] The reason for detecting the ambient humidity outside the washing drum at intervals in this embodiment of the invention is that the introduced fresh air is from around the washing machine and is prone to change with the weather, room temperature, and the heat emitted by the washing machine's motor or heater. Therefore, the ambient temperature outside the washing drum is detected at intervals, and the real-time detected ambient temperature is mapped to the divided temperature levels and matched with the corresponding valve diameter level to control the amount of fresh air introduced by the fresh air introduction device.

[0080] In any of the above embodiments, the method for determining whether the fresh air introduction conditions are met includes:

[0081] When the ambient humidity outside the washing drum is lower than the preset ambient humidity, it is determined that the ambient humidity outside the washing drum meets the conditions for fresh air introduction.

[0082] If the ambient humidity outside the washing drum is greater than or equal to the preset ambient humidity, it is determined that the ambient humidity outside the washing drum does not meet the conditions for fresh air introduction.

[0083] Since the fresh air in this embodiment of the invention enters the drum directly without passing through a heater or condenser, excessive humidity in the outside fresh air will reduce the drying efficiency of the washing machine. Therefore, when the humidity of the outside environment of the washing drum is less than the preset humidity, it is determined that the humidity of the outside environment of the washing drum meets the conditions for introducing fresh air.

[0084] like Figures 3-6 As shown, a second aspect of the present invention provides a washing machine that can employ the above-described fresh air introduction control method, wherein the washing machine includes:

[0085] The washing drum includes an outer drum 1 and an inner drum pivotally disposed within the outer drum 1; wherein the rear inner wall of the outer drum 1 is provided with water guiding ribs;

[0086] External circulation drying air duct 2, the air inlet of external circulation drying air duct 2 is connected to the outer cylinder 1, and the air outlet is connected to the inner cylinder;

[0087] Water injection pipe, used to inject water into outer cylinder 1 and external circulation drying air duct 2;

[0088] Fresh air introduction device 3 is installed on the outer cylinder 1 and communicates with the outer cylinder. Fresh air introduction device 3 includes a fresh air inlet and a fresh air outlet, and a fresh air fan 31 between the fresh air inlet and the fresh air outlet.

[0089] like Figure 5 and Figure 6As shown, the fresh air introduction device 3 also includes a fresh air introduction valve 32 located at the fresh air inlet and / or fresh air outlet;

[0090] First humidity sensor 4 is used to detect the humidity of the external environment of the washing drum;

[0091] The first temperature sensor is used to detect the ambient temperature inside the washing drum.

[0092] The controller is used to control the opening and closing of the fresh air fan and the fresh air inlet valve 32 according to the external humidity and internal temperature of the washing drum.

[0093] Preferably, the first temperature sensor 4 is located on the external circulation drying air duct 2.

[0094] The washing machine in this embodiment of the invention has dual condensing air ducts. One condensing air duct is an internal air duct formed between the outer drum 1 and the inner drum, and the other condensing air duct is an external air duct located on the outer wall of the rear part of the outer drum, thereby achieving the dual condensing effect of the washing machine.

[0095] Specifically, in this embodiment of the invention, by setting the fresh air introduction device 3 to be connected to the outer cylinder 1, the condensation effect can be improved. Since the space between the outer cylinder 1 and the inner cylinder is large, most of the hot and humid air gathers between the outer cylinder 1 and the inner cylinder. Therefore, introducing fresh air between the outer cylinder 1 and the inner cylinder can improve the condensation effect on the hot and humid air.

[0096] Specific;

[0097] The washing machine also includes:

[0098] The second temperature sensor is used to detect the ambient temperature outside the washing drum.

[0099] The controller is used to control the opening degree of the fresh air inlet valve based on the ambient temperature outside the washing drum.

[0100] Furthermore, such as Figure 5 and Figure 6 As shown, the fresh air introduction device includes:

[0101] Fresh air housing 33 has a fresh air cavity inside and fresh air inlet and fresh air outlet on both sides that communicate with the fresh air cavity.

[0102] Bracket 34 is fixed at the fresh air inlet, and the fresh air fan 31 is fixedly connected to the side of the bracket facing the fresh air outlet;

[0103] Fan blade 35 is located in the fresh air cavity and is connected to the fresh air fan 31;

[0104] The fresh air inlet valve 32 is located at the fresh air outlet.

[0105] When the washing machine is in drying mode, some of the hot and humid air inside the washing drum will first come into contact with the condensate guided by the water guide ribs on the inner wall of the rear part of the outer drum 1. The condensate condenses the hot and humid air and is discharged from the drain outlet, while the dry air is recirculated back into the inner drum by the fan assembly. Another part of the hot and humid air inside the washing drum enters the external circulation drying air duct from the air outlet on the outer drum, comes into contact with the condensate in the external circulation drying air duct and is condensed, while the dry air is recirculated back into the drum by the fan assembly.

[0106] An opening is made at the top of the double-condenser outer drum, through which a fresh air introduction device can be installed, allowing fresh air to be introduced from the outside. The hot and humid air inside the washing drum will accumulate at the top. Before this hot and humid air comes into contact with the condensate on the inner wall of the rear of the outer drum 1, the introduced fresh air can cool it down first. When it comes into contact with the condensate, a large amount of condensate is not needed to replace the heat and moisture in the hot and humid air, which saves water resources and effectively improves drying efficiency.

[0107] Furthermore, to better understand the working principle of the washing machine in the present invention during drying, the following is a detailed explanation. Figures 1-6 Please provide a detailed explanation:

[0108] When the washing machine starts the drying program, it first detects the humidity of the external environment of the washing drum. {It is worth noting that the external environmental humidity mentioned in this embodiment of the invention can be the humidity between the outer drum and the washing machine cabinet, or the external environmental humidity of the washing machine. Since the space between the outer drum and the cabinet is connected to the external environment of the washing machine, the external environmental humidity here can be either the humidity between the outer drum and the washing machine cabinet or the external environmental humidity of the washing machine. Similarly, the external environmental temperature of the washing drum mentioned below is also like this.} After all, the fresh air introduced by this solution enters directly into the outer drum without passing through a heater or condenser. If the external humidity is high, it will reduce the drying efficiency.

[0109] If the detected ambient humidity is lower than the preset ambient humidity, proceed to the next step. If the ambient humidity is higher than or equal to the preset ambient humidity, directly enter the drying program without introducing fresh air.

[0110] Specifically, when the detected external ambient humidity is lower than the preset ambient humidity, the internal ambient temperature of the washing drum (i.e., the return air temperature) is further detected. The reason for detecting the ambient temperature inside the washing drum in this embodiment of the invention is that the induced draft device can only be turned on after the rapid heating stage of drying has ended. If it is turned on too early, the temperature inside the drum will not rise, which will affect the drying efficiency.

[0111] More specifically, when the temperature inside the washing drum reaches the first preset temperature (it is worth noting that after the rapid heating phase ends during the drying process, it will enter a relatively flat phase with an inflection point; the temperature slightly lower than the inflection point can be taken as the first preset temperature), reaching the first preset temperature indicates that the rapid heating phase has ended, and the induced draft device can be turned on. If it has not been reached, continue measuring the temperature.

[0112] More specifically, when the temperature inside the washing drum reaches the first preset temperature, the fresh air introduction device is turned on, and the opening degree of the fresh air introduction valve in the fresh air introduction device is controlled according to the ambient temperature outside the washing drum.

[0113] Meanwhile, the ambient temperature outside the washing drum is checked at preset intervals. Because the incoming fresh air comes from around the washing machine, it is susceptible to changes in room temperature and temperature, as well as the heat emitted by the washing machine's motor or heater. Therefore, it is necessary to check the ambient temperature at regular intervals. The detected ambient temperature is then mapped to the aforementioned temperature levels, and the corresponding valve opening is adjusted accordingly.

[0114] Continue monitoring the return air temperature inside the washing drum. When the temperature inside the washing drum is lower than the first preset temperature...

[0115] This means the drying process is almost over, and the temperature inside the washing drum begins to drop. Turning on the exhaust system at this point will not improve drying efficiency and will only waste energy. Therefore, the fresh air intake device should be turned off. If the temperature is higher than the first preset temperature, it means that drying is in progress, and the opening of the fresh air intake device can be adjusted according to the above control logic to continue to introduce fresh air.

[0116] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0117] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for controlling the introduction of fresh air into a washing machine, characterized in that, The washing machine includes a fresh air inlet device (3), which is located at the top of the outer drum (1) and is used to condense the hot and humid air at the top of the outer drum of the washing machine. The method includes: During the drying process, the humidity of the external environment outside the washing drum is obtained to determine whether the humidity of the external environment meets the conditions for the introduction of fresh air. If the external humidity does not meet the requirements for fresh air introduction, the fresh air introduction device will be shut down, and the drying process will continue. If the external humidity meets the requirements for fresh air introduction, the internal temperature of the washing drum is obtained, and the opening and closing of the fresh air introduction device is controlled according to the internal temperature of the washing drum, while the drying program continues.

2. The fresh air introduction control method according to claim 1, characterized in that, The method for controlling the opening and closing of the fresh air introduction device based on the internal ambient temperature of the washing drum includes: When the ambient temperature inside the washing drum is greater than or equal to the first preset temperature value, the fresh air introduction device is turned on. When the ambient temperature inside the washing drum is lower than the first preset temperature value, the fresh air introduction device is shut off.

3. The fresh air introduction control method according to claim 2, characterized in that, The method for controlling the activation of the fresh air intake device includes: Turn on the fresh air fan and fresh air inlet valve, and obtain the ambient temperature outside the washing drum. Control the opening degree of the fresh air inlet valve of the fresh air inlet device according to the ambient temperature outside the washing drum.

4. The fresh air introduction control method according to claim 3, characterized in that, The opening degree of the fresh air inlet valve includes n opening degrees from small to large, X1, X2, X3...Xn; The outside fresh air temperature has n temperature levels, ranging from low to high: T1, T2, T3...Tn; Where X1 corresponds to T1, X2 corresponds to T2, X3 corresponds to T3, ..., Xn corresponds to Tn; The control of the opening degree of the fresh air introduction valve based on the external ambient temperature of the washing drum includes: The valve opening is determined based on the outside fresh air temperature level, and the opening of the fresh air inlet valve is controlled based on the determined valve opening.

5. The fresh air introduction control method according to any one of claims 1-4, characterized in that, The method for controlling the opening and closing of the fresh air introduction device based on the internal ambient temperature of the washing drum further includes: The ambient temperature outside the washing drum is acquired at preset intervals, and the opening degree of the fresh air introduction valve is controlled according to the ambient temperature outside the washing drum.

6. The fresh air introduction control method according to any one of claims 1-4, characterized in that, The methods for determining whether the conditions for introducing fresh air are met include: When the ambient humidity outside the washing drum is less than the preset ambient humidity, it is determined that the ambient humidity outside the washing drum meets the conditions for introducing fresh air. If the ambient humidity outside the washing drum is greater than or equal to the preset ambient humidity, it is determined that the ambient humidity outside the washing drum does not meet the conditions for introducing fresh air.

7. A washing machine, characterized in that, The washing machine includes: A washing drum, the washing drum including an outer drum (1) and an inner drum pivotally disposed in the outer drum (1); An external circulation drying air duct (2) is provided, wherein the air inlet of the external circulation drying air duct (2) is connected to the outer cylinder (1) and the air outlet is connected to the inner cylinder; Water injection pipe, the water injection pipe is used to inject water into the outer cylinder (1) and the external circulation drying air duct (2); Fresh air introduction device (3), the fresh air introduction device (3) is provided on the outer cylinder (1) and communicates with the outer cylinder (1), the fresh air introduction device (3) includes a fresh air inlet and a fresh air outlet and a fresh air fan (31) between the fresh air inlet and the fresh air outlet. The fresh air introduction device (3) also includes a fresh air introduction valve (32) located at the fresh air inlet and / or fresh air outlet. The first humidity sensor (4) is used to detect the humidity of the external environment of the washing drum; The first temperature sensor is used to detect the ambient temperature inside the washing drum. The controller is used to control the opening and closing of the fresh air fan and the fresh air inlet valve (32) according to the external ambient humidity and internal ambient temperature of the washing drum.

8. The washing machine according to claim 7, characterized in that, The fresh air introduction device (3) also includes a fresh air introduction valve (32) located at the fresh air inlet and / or fresh air outlet. The washing machine also includes: The second temperature sensor is used to detect the ambient temperature outside the washing drum. The controller is used to control the opening degree of the fresh air inlet valve according to the ambient temperature outside the washing drum.

9. The washing machine according to claim 7, characterized in that, The fresh air introduction device includes: Fresh air housing (33), the fresh air housing (33) has a fresh air cavity inside, and a fresh air inlet and a fresh air outlet connected to the fresh air cavity on both sides; A bracket (34) is fixed at the fresh air inlet, and the fresh air fan (31) is fixedly connected to the side of the bracket facing the fresh air outlet. The fan blade (35) is located in the fresh air cavity and connected to the fresh air fan (31); The fresh air inlet valve (32) is located at the fresh air outlet.

10. The washing machine according to any one of claims 7-9, characterized in that, The fresh air introduction device (3) is located on the top of the outer cylinder (1).

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