A drum washing machine having an external ventilation system

Abstract

This invention discloses a drum washing machine with an external ventilation system. An independent ventilation system is connected to the middle section of the existing drum washing machine's drying tunnel system. This system has a miniature ventilation motor independent of the original drying fan and is located at the rear of the control panel. The external ventilation system has an independent airflow path, within which a fragrance diffuser is installed. This invention also provides a ventilation and fragrance control method for this washing machine. When the ventilation motor is working, it draws in outside air through the fragrance diffuser area, sends it into the inner drum through the middle section of the drying tunnel, and then discharges it through the air outlet duct, achieving independent control of air replacement and fragrance enhancement within the drum.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of household appliances, and particularly relates to a drum washing machine with an external ventilation system. BACKGROUND

[0002] At present, the mainstream technical direction in the field of drum washing machines mainly includes two categories: one is a washing-drying integrated machine with a drying function, which sends heated hot air into the inner drum through the drying duct system to realize clothes drying; the other is to add a softener, a fragrance liquid or release fragrance substances through high-temperature steam after the washing program ends to increase the fragrance of clothes. In addition, in recent years, some enterprises have begun to explore the introduction of a fresh air system in the washing machine, which opens a fresh air inlet on the machine shell, adds a fresh air fan and connects it to the drum assembly, uses fresh air to replace the air in the drum to avoid the breeding of bacteria and the generation of odor.

[0003] However, this technology still has the following defects or deficiencies: 1. After the existing drum washing machine ends the washing or completes the drying, if the clothes are not taken out in time, the residual hot and humid air in the drum cannot be effectively replaced, which is easy to breed bacteria and produce moldy smell, affecting the user experience; 2. The release of fragrance substances in the existing washing machine with fragrance function depends on the detergent dispensing or high-temperature steam assisted volatilization, on the one hand, the fragrance release effect is closely related to the amount of washing water, water temperature and program length, which is difficult to control accurately; on the other hand, the user cannot independently perform air replacement and fragrance operation in the drum without starting the washing or drying program; 3. The existing fresh air system is highly coupled with the drying duct system, the fresh air inlet is usually set at the back or lower part of the machine shell, the air inlet path is long and shares part of the channel with the original air duct, which has the problems of insufficient air pressure, air volume loss, and the fresh air volume is limited by the cross-sectional area of the drying air duct and the power of the fan, which is difficult to achieve sufficient fresh air replacement in the non-drying mode; 4. The existing washing machine with fragrance function, the fragrance assembly is mostly built-in in the washing machine, and the user has difficulty in replacing the fragrance sheet or cleaning the filter device; 5. When the existing fresh air system is running, the fresh air channel is always open, which will lose air volume and heat exchange, resulting in reduced efficiency, in addition, the existing washing machine with fragrance function, the fragrance module is mostly located in the detergent box or the drying duct, which cannot work independently without starting the main program, and is difficult to replace.

[0004] The root cause of these problems lies in the fact that the existing drum washing machine's drying duct system and drum assembly form a relatively closed air circulation loop. After washing or drying, the hot and humid air inside the drum cannot be expelled in time. As the temperature drops, water vapor condenses on the drum wall and door seal, becoming a breeding ground for bacteria and mold. Furthermore, most existing fresh air introduction solutions are designed to assist drying, sharing the same fan and duct structure with the drying duct. This results in significant constraints on the fresh air introduction path and airflow distribution due to the existing design space. In addition, existing aromatherapy technologies often attach the aromatherapy function to the washing or drying program, failing to provide users with independent and flexible drum air management and fragrance enhancement capabilities. Summary of the Invention

[0005] To address the aforementioned issues, this invention discloses a drum washing machine with an external ventilation system. An independent ventilation system is connected externally to the middle section of the existing drum washing machine's drying tunnel system. This ventilation system includes an inlet duct and an outlet duct. The inlet duct draws air into the machine body from the right side of the control panel, while the outlet duct leads out from the left side of the control panel. A micro ventilation motor, independent of the original drying fan, connects the two ducts. A fragrance chip insert structure is installed along the path of the inlet duct, allowing the user to replace the fragrance chip as needed. When the ventilation motor operates, it draws in outside air through the fragrance chip area, sends it into the inner drum through the middle section of the drying tunnel, and then discharges it through the outlet duct, achieving independent control of air replacement and fragrance enhancement within the drum.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A drum washing machine with an external ventilation system includes a washing machine body, a drum, an outer tub, a drying tunnel system, a control panel, and an external ventilation system. The control panel is located at the front of the washing machine, and the external ventilation system is located at the rear of the control panel. The external ventilation system has an independent airflow path, and an aromatherapy tablet device is installed in the airflow path.

[0007] Furthermore, the external ventilation system includes a shock-absorbing bracket, a miniature ventilation motor, an air inlet duct assembly, an air outlet duct, an aromatherapy box, and a control system. The shock-absorbing bracket is located behind the control panel of the drum washing machine and is fixed to the inner wall of the machine body with bolts; The miniature ventilation motor is located in the middle of the shock-absorbing bracket; The air inlet duct assembly includes an air inlet pipe, an air inlet base, and an air inlet. The air inlet base is located on the right side of the shock-absorbing bracket, and the air inlet is located at the front end of the air inlet base. The air inlet is equipped with a movable grille. The air inlet is located on the right side of the control panel, and an air inlet pipe is connected between the air inlet and the air inlet of the micro ventilation motor. One end of the air outlet pipe is connected to the air outlet of the micro ventilation motor, and the other end extends to the left side of the washing machine control panel and is connected to the middle section of the detergent box pipe through a T-connector, connecting to the internal drying tunnel system of the drum washing machine. The aromatherapy box is movably disposed inside the grid, with an opening at the top and aromatherapy tablets placed inside. The control system is equipped with a ventilation control module, which can control the opening and closing of the micro ventilation motor.

[0008] Furthermore, the shock-absorbing bracket is fixed to the inner wall of the machine body by silicone pads to reduce vibration and noise and increase the sealing between the ventilation pipe and the control panel.

[0009] Furthermore, the micro ventilation motor has a rated power of 3-10W, a rated voltage of 12V, and an air volume designed to be 5-15L / min (non-drying mode) and 15-30L / min (auxiliary drying mode). It is independent of the start / stop control of the drying system and is driven by the washing machine main control board through a relay or MOSFET.

[0010] Furthermore, the grille is equipped with a rotating snap-lock device, which facilitates opening, replacement, and maintenance.

[0011] Furthermore, the air outlet of the drying tunnel system is located on the left side of the control panel.

[0012] Furthermore, a backflow prevention check valve is installed at the end of the air outlet duct to prevent hot and humid air inside the duct from flowing back into the ventilation motor and air inlet duct.

[0013] Furthermore, a flow regulating valve is installed inside the air outlet duct to regulate the airflow entering the drying tunnel system. This valve is controlled by the washing machine's control panel.

[0014] Furthermore, the control panel features a "ventilation and fragrance enhancement mode" that allows users to set the running time and airflow.

[0015] A control method for a drum washing machine with an external ventilation system, comprising: Step 1: On the control panel, the user selects "Ventilation and Fragrance Enhancement Mode" and sets the running time (default 15 minutes) and airflow level (low / medium / high three levels, low about 6L / min, medium about 12L / min, high about 20L / min) via touch screen or knob.

[0016] Step 2: The ventilation control module on the washing machine control panel determines whether the drum door is closed, whether the drain motor is stopped, etc., and outputs a control signal to start the micro ventilation motor after ensuring safety.

[0017] Step 3: The miniature ventilation motor runs, and fresh outside air is drawn in through the air inlet on the right side of the control panel. After being filtered by the air inlet grille, it enters the air inlet duct. When the airflow in the air inlet duct flows through the aromatherapy tablet slot area, it carries the fragrance substances released by the aromatherapy tablet into the airflow. Step 4: Fresh air carrying aromatherapy substances is pressurized by a micro ventilation motor and enters the air outlet pipe. It then enters the middle section of the drying tunnel system (or directly into the drum assembly) through a three-way connector. After merging with the circulating air in the original drying air duct, it enters the inner drum together.

[0018] Step 5: Fresh air carrying fragrance comes into contact with the clothes in the inner drum. Some of the air containing fragrance substances is absorbed by the clothing fibers to create a fragrance effect. At the same time, the humid and hot air accumulated in the inner drum is displaced from the machine body and discharged from the washing machine through the door seal gap, drain pipe or dedicated exhaust port.

[0019] Step 6: After the set running time is reached, the main control board controls the micro ventilation motor to stop working, or the user can manually terminate it.

[0020] The beneficial effects of this invention are as follows: (1) External connection method between independent ventilation motor and middle section of drying tunnel: The ventilation schemes in the prior art are mostly to set up a completely independent fresh air duct directly connected to the cylinder assembly, or to set the fresh air inlet at the detergent box and introduce it through the existing drying channel, which results in a long air intake path and high resistance. The present invention creatively connects the ventilation motor externally to the middle section of the drying tunnel system, and uses the existing passage of the drying tunnel system to efficiently transport fresh air with fragrance substances into the cylinder. This avoids the wind direction interference and efficiency loss that may be caused by direct air intake from the cylinder opening, and significantly shortens the air intake path and reduces wind resistance, thus achieving efficient ventilation of a small power ventilation motor.

[0021] (2) The layout of the air inlet and air outlet on both sides of the control panel: The air inlet is located on the right side of the control panel and the air outlet is connected to the left side of the control panel (the air inlet side is on the right and the air outlet side is on the left). This makes the ventilation system compatible with the electrical layout and panel functional zoning of the existing washing machine, avoids spatial conflicts with structural components such as detergent box and door hinges, and significantly shortens the length of the air duct, reducing wind resistance and energy loss. At the same time, the natural airflow path on both sides of the control panel (right side → left side) forms a "through wind" effect, which improves ventilation efficiency.

[0022] (3) Modular design of aromatherapy tablets placed outside the air intake path of the ventilation motor: The aromatherapy tablet insert structure is integrated into the air intake path of the ventilation motor, rather than being built into the drying tunnel or detergent box, so that the aromatherapy tablets can play a role independently of the washing and drying programs, without being restricted by factors such as washing water volume and temperature. The aroma release process is independently controllable, and users can still use the ventilation and fragrance enhancement function without starting any washing program.

[0023] (4) Integration of multiple ventilation control modes: The hardware level realizes the independent configuration of the ventilation system, and the control method level integrates multiple working modes such as manual ventilation and fragrance enhancement, timed ventilation, temperature and humidity linkage control, and odor detection linkage control, so that the ventilation system can maintain the air inside the cylinder fresh for a long time with extremely low energy consumption and automatically respond when clothing odor is generated.

[0024] (5) The aromatherapy device can be opened by rotating or pushing the device so that users can replace the aromatherapy tablets, making the physical interaction more comfortable. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the external ventilation system described in this invention.

[0026] Figure 2 This is a schematic diagram of the external ventilation system described in this invention after installation.

[0027] Figure 3 This is a schematic diagram of the airflow direction of the present invention.

[0028] Figure 4 This is a schematic diagram of the internal structure of the external ventilation system described in this invention after installation.

[0029] Figure 5 This is a rear view of the external ventilation system structure described in this invention.

[0030] List of identifiers in attached diagrams: 1. Washing machine body; 2. Control panel; 3. Drum; 4. Outer drum; 5. Drying tunnel system; 6. Miniature ventilation motor; 7. Air inlet pipe; 8. Air outlet pipe; 9. Air inlet; 9a. Grille; 10. Aromatherapy box; 11. Aromatherapy box cover; 12. Aromatherapy tablets; 13. Shock-absorbing bracket; 14. Air outlet; 15. Bolt; 16. External ventilation system. Detailed Implementation

[0031] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0032] Example 1: Manual ventilation and fragrance enhancement mode like Figure 1 and 2As shown, the drum washing machine with an external ventilation system provided in this embodiment includes a washing machine body 1, a rotatable drum 3 inside, and a fixed outer drum 4. A control panel 2 is provided on the front side of the washing machine, which integrates a touch screen and a knob adjustment device. A DC 12V micro motor 6 is installed behind the control panel 2 as a ventilation pump, with a rated voltage of 12V, a rated power of approximately 5W, and an air volume of 5-30L / min. This micro ventilation motor 6 is mounted on a shock-absorbing bracket 13, which is fixed to the inner wall of the machine body by bolts 15, with a silicone pad in the middle to reduce operating noise.

[0033] A square air inlet 9 is located on the lower right side of the control panel 2. A removable air inlet grille 9a is installed on the outside of the air inlet 9. The mesh size of the air inlet grille 9a is 2mm×2mm, which is used to block large particles such as hair and dust from entering the ventilation system.

[0034] A 12mm diameter silicone hose serves as an air intake pipe 7, connecting the air inlet 9 to the air intake pipe of the micro ventilation motor 6. A rectangular aromatherapy box 10 is located in the middle of this silicone hose, near the right side of the control panel 2. The aromatherapy box 10 passes through a mounting hole on the control panel 2 from inside the washing machine, and its external opening has a pull-out cover / drawer 11. A solid aromatherapy tablet 12 can be placed inside the aromatherapy box 10. The aromatherapy tablet 12 is made by adsorbing natural plant extracts (such as lavender essential oil, citrus essential oil, etc.) onto a porous inorganic material carrier (approximately 20mm × 40mm × 5mm). When airflow passes through the aromatherapy box, air enters from the air inlet side of the aromatherapy tablet and exits from the air outlet side. After sufficient contact with the aromatherapy tablet, the airflow carries the fragrance into the machine body 1. Sealing rings are installed at the interfaces of the silicone hose and the ventilation motor's air intake pipe, as well as at both ends of the aromatherapy box, to ensure airtightness.

[0035] The exhaust port of the miniature ventilation motor 6 is connected to a 12mm diameter PVC corrugated hose as an exhaust pipe 8. This exhaust pipe 8 runs from the left side of the control panel 1 on the back of the washing machine and connects to the middle section of the drying duct system 5 via a T-connector. The drying duct system 5 is a drying duct assembly already present in existing drum washing machines, including a box-shaped duct housing and its internal heating wire (PTC heater) and circulating fan. Fresh air carrying aroma in the exhaust pipe 8 mixes with the airflow that may be circulating inside the drying duct system and smoothly enters the drum 3.

[0036] In order to control the amount of air entering the drum, an electric air volume regulating valve (not specifically shown in the attached figure) is also coaxially installed at the connection of the air outlet pipe 8 near the drying tunnel system 5. The drive circuit of the valve is connected to the main control board of the washing machine.

[0037] After the user removes the washed and dried clothes from the washing machine, or when they wish to add fragrance to the dried clothes, they can select the "Ventilation and Fragrance Enhancement Mode" via the touchscreen or knob on the control panel 2, and adjust the ventilation mode to "Manual Ventilation," setting the continuous working time to, for example, 15 minutes. The "Medium Airflow" (approximately 7L / min) option is selected. The control panel 2 transmits this setting signal to the washing machine's main control board. The main control board first performs self-checks, such as checking if the door is closed and if the drain pump has stopped. After confirming safety, the main control board drives the micro ventilation motor 6 to operate at the corresponding speed. The micro ventilation motor 6 operates, and its suction draws in fresh outside air from the air inlet 9 on the right side of the control panel. After being filtered by the air inlet grille 9a, the air enters the air inlet pipe 7. As the air passes through the solid fragrance tablet 13 inserted in the fragrance box 11, it carries the fragrance emitted by the tablet. The scented air is pressurized by the micro ventilation motor 6, flows through the air outlet pipe 8, and then enters the middle section of the drying tunnel system 5 via the airflow regulating valve. Scented air mixes with the air from the existing drying fan in the drying tunnel system 5 and then enters the interior of the drum 3 and outer drum 4 through the air outlet of the drying tunnel. This ensures thorough contact with the clothes inside, diffusing the fragrance into the clothing fibers for an aromatherapy effect. Simultaneously, it displaces the humid air from the drum's interior through gaps in the door edge and drain pipes. Users can clearly feel the suction by placing their hand near the air inlet on the right side of the control panel. The temperature and humidity felt at the edge of the drum door seal or on the left side of the control panel confirm the effective entry of outside air. After 15 minutes, the main control board stops supplying power to the micro-ventilation motor, ending one "ventilation and fragrance enhancement" cycle.

[0038] Meanwhile, replacing the aromatherapy tablets 12 in this embodiment is extremely simple. Users simply need to pull open the aromatherapy box cover / drawer 11 located under the control panel 2, remove the old solid aromatherapy tablet 12, insert a new (or re-fragrant) aromatherapy tablet 12, and close the drawer 11 to complete the replacement process. Users can also use different types of aromatherapy tablets according to their personal preferences, such as inserting cotton aromatherapy tablets and adding extra fragrance liquid.

[0039] Example 2: Multi-mode joint operation: This embodiment is largely the same in structure as Embodiment 1, with the following differences: (1) A "timed ventilation" mode is integrated into the washing machine's control program. Users can set the machine to ventilate every 2 hours from 22:00 to 06:00 the next morning, with each ventilation lasting 5 minutes. The main control board of the washing machine will activate the micro ventilation motor 6 according to the preset program time and execute step 3 (ventilation step). This setting is especially useful when the washing is finished. Its purpose is to keep the air circulating inside the drum by periodically ventilating the clothes in case the user leaves the washed and damp clothes inside temporarily without taking them out. This prevents the growth of odors inside the drum during the dormant period due to the user forgetting to take them out, and ensures that the inside smells fresh when the clothes are taken out again.

[0040] (2) A humidity sensor (model: DHT22, digital temperature and humidity sensor) and a temperature sensor (model: DS18B20, high-precision digital temperature sensor) are installed inside the washing machine (e.g., on the outer drum wall or on the piping of the drying tunnel system at the rear of the washing chamber). The sensors are connected to the main control board of the washing machine to monitor the humidity of the environment inside the drum. 30 minutes after the washing machine's drying program or standard washing program ends, the washing machine's control program detects that the real-time relative humidity inside the drum is higher than a certain threshold (e.g., relative humidity exceeds 75%), and if the user does not open the door to remove clothes during this period (monitored by the door paper switch sensor), the control program automatically determines to activate the ventilation system to perform low-speed micro-ventilation at the minimum fan power (approximately 0.2W, extremely low noise) to reduce humidity until the humidity drops below the threshold (e.g., approximately 60% relative humidity) and then stops. This mode can efficiently ensure the hygiene level inside the drum and greatly reduce the possibility of pathogenic microorganisms (e.g., mold) growing due to high humidity. Furthermore, the ventilation system operates independently, avoiding the unnecessary high energy consumption caused by using the high-power original drying tunnel circulation system.

[0041] (3) The air inlet 9 and the air outlet connection point are located on the left and right sides of the control panel, and the airflow path is designed to correspond cleverly with the internal air duct of the washing machine. The air inlet is located on the right side of the control panel (the side closer to the wall), and the air outlet is located on the left side of the control panel, connecting to the middle section of the drying tunnel from the left side. The layout of the two makes full use of the limited space on the front side of the machine, and is basically arranged in the empty space behind the control panel. The micro ventilation motor 6 is designed to be cubic in shape to fit the spatial layout. In this embodiment, the micro ventilation motor 6 uses a higher efficiency piezoelectric ceramic diaphragm micro fan (e.g., model: D01-75). The rated voltage is DC24V, the maximum airflow is 30L / min, and the service life exceeds 50,000h, which is fully capable of withstanding the maintenance life of the washing machine.

[0042] (4) Further optimization of the control method – including an intelligent air supply mode linked to odor concentration. In this embodiment, an odor sensor (such as a semiconductor gas sensor, commonly known as an "electronic nose") is also configured inside the washing machine to detect odor-producing chemicals (such as trimethylamine, hydrogen sulfide, etc.). When the washing is completed for a period of time and the user has not taken out the clothes or put them in the storage of clean clothes and the machine detects that the odor exceeds the set value, the main control board automatically drives the ventilation system (selecting high air volume operation) based on the odor signal. This realizes closed-loop control for automatic detection and ventilation deodorization of clothes odors caused by dampness or incomplete washing, further improving the product's intelligence level and user satisfaction.

[0043] (5) The aromatherapy box 10 is designed as a movable card slot module. When the user does not want to use the aromatherapy (i.e. only needs to achieve simple ventilation without adding fragrance), the aromatherapy tablet can be easily removed. After the simplification of the structure, it can still serve as an airflow channel for the ventilation system to remain unobstructed, and the aromatherapy box body has less resistance to airflow and will not affect the operation of the main function.

[0044] In summary, this invention addresses the pain points of existing washing machines, such as the tendency for unpleasant odors to develop in the existing cleaning / drying space and the user's desire for convenient fragrance enhancement, by adding a flexible, controllable micro-external ventilation system 16 that integrates air intake and exhaust with aromatherapy, independent of the core drying air duct of the drum washing machine. This innovation results in minimal increase in energy consumption while significantly improving the user experience, providing a high-quality, differentiated option for the current washing machine market.

[0045] It should be noted that the above content merely illustrates the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, various improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A drum washing machine with an external ventilation system, characterized in that: The washing machine includes a washing machine body, drum, outer drum, drying tunnel system, control panel and external ventilation system. The control panel is located on the front side of the washing machine, and the external ventilation system is located at the rear of the control panel. The external ventilation system has an airflow drive path independent of the original drying fan, and its air outlet is connected to the middle section of the drying tunnel system.

2. A drum washing machine with an external ventilation system according to claim 1, characterized in that: The external ventilation system includes a shock-absorbing bracket, a miniature ventilation motor, an air inlet duct assembly, an air outlet duct, an aromatherapy box, and a control system. The shock-absorbing bracket is located behind the control panel of the drum washing machine and is fixed to the inner wall of the machine body; The miniature ventilation motor is located in the middle of the shock-absorbing bracket; The air inlet duct assembly includes an air inlet pipe, an air inlet base, and an air inlet. The air inlet base is located on the right side of the shock-absorbing bracket, and the air inlet is located at the front end of the air inlet base. The air inlet is equipped with a movable grille. The air inlet is located on the right side of the control panel, and an air inlet pipe is connected between the air inlet and the air inlet of the micro ventilation motor. One end of the air outlet pipe is connected to the air outlet of the micro ventilation motor, and the other end extends to the left side of the washing machine control panel and is connected to the middle section of the machine body pipe through a three-way connector, connecting to the internal drying tunnel system of the drum washing machine. The aromatherapy box is movably disposed inside the grid, with an opening at the top and aromatherapy tablets placed inside. The control system is equipped with a ventilation control module, which can control the opening and closing of the micro ventilation motor.

3. A drum washing machine with an external ventilation system according to claim 1, characterized in that: The shock-absorbing bracket is fixed to the inner wall of the machine body by silicone pads to reduce vibration and noise and increase the sealing between the ventilation pipe and the control panel.

4. A drum washing machine with an external ventilation system according to claim 1, characterized in that: The miniature ventilation motor has a rated power of 3-10W, a rated voltage of 12V, and an air volume designed to be 5-30L / min. It is independently controlled by the start / stop of the drying system and is driven by the main control board of the washing machine through a relay or MOSFET.

5. A drum washing machine with an external ventilation system according to claim 1, characterized in that: The washing machine is equipped with a humidity sensor, a temperature sensor, and an odor sensor.

6. A drum washing machine with an external ventilation system according to claim 1, characterized in that: The air outlet of the drying tunnel system is located on the left side of the control panel.

7. A drum washing machine with an external ventilation system according to claim 1, characterized in that: The end of the air outlet duct is equipped with a backflow prevention check valve to prevent hot and humid air from flowing back into the ventilation motor and air inlet duct.

8. A drum washing machine with an external ventilation system according to claim 1, characterized in that: An air flow regulating valve is also installed inside the air outlet duct to regulate the air flow entering the drying tunnel system. This valve is controlled by the control panel of the washing machine.

9. A drum washing machine with an external ventilation system according to claim 1, characterized in that: The control panel features a "ventilation and fragrance enhancement mode," and the control system controls the operation of the miniature ventilation motor based on this selection and the set running time and air volume parameters.

10. A drum washing machine with an external ventilation system according to claim 1, characterized in that: Its control method include Step 1: The user selects "Ventilation and Fragrance Enhancement Mode" on the control panel and sets the running time and airflow level via the touchscreen or knob; Step 2: The ventilation control module on the washing machine control panel determines whether the drum door is closed and whether the drain pump is stopped. After ensuring safety, it outputs a control signal to start the micro ventilation motor. Step 3: The miniature ventilation motor runs, and fresh outside air is drawn in through the air inlet on the right side of the control panel. After being filtered by the air inlet grille, it enters the air inlet duct. When the airflow in the air inlet duct flows through the aromatherapy tablet slot area, it carries the fragrance substances released by the aromatherapy tablet into the airflow. Step 4: Fresh air carrying aromatherapy substances is pressurized by a micro ventilation motor and enters the air outlet pipe. It then enters the middle section of the drying tunnel system through a three-way connector, where it merges with the circulating air in the original drying air duct and enters the inner drum of the drum. Step 5: Fresh air carrying fragrance comes into contact with the clothes in the inner drum. Some of the air containing fragrance substances is absorbed by the clothing fibers to create a fragrance effect. At the same time, the humid and hot air accumulated in the inner drum is displaced out of the drum and discharged from the machine through the original air outlet path of the washing machine. Step 6: After the set running time is reached, the main control board controls the micro ventilation motor to stop working, or the user can manually terminate it.

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