Fresh air system, air conditioner applying fresh air system and control method

Abstract

The invention discloses a fresh air system, an air conditioner applying the fresh air system and a control method.The fresh air system comprises an air inlet cavity assembly, a volute assembly, a first air door, a second air door, a third air door and a fourth air door, and the first air door is arranged at the joint of the air inlet cavity assembly and the volute assembly; the second air door and the third air door are arranged at the upper end and the lower end of the air inlet cavity assembly correspondingly. The fourth air door is located on the volute assembly. The first air door has a first state for communicating the air inlet cavity assembly with the outdoor space and a second state for communicating the volute assembly with the outdoor space. The second air door and the third air door are separately arranged at the top and the bottom, so that the exhaust air inlet can dynamically select the direction; when the air conditioner outputs air from the lower part, the third air door at the bottom is closed, and the second air door at the top is started to supply air to avoid an air supply outlet of the air conditioner at the bottom; when the air conditioner discharges air, the top second air door is closed, the bottom third air door is started for air inlet, a top air conditioner air supply outlet is avoided, air flow just refrigerating / heating of the air conditioner is thoroughly prevented from being sucked in, and energy waste and temperature control failure are eliminated.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and in particular relates to a fresh air system, an air conditioner using the same, and a control method. Background Art

[0002] With increasing demands for indoor air quality, fresh air air conditioning systems, which introduce outdoor air to improve the indoor environment, have become a common solution. However, continuously introducing fresh air into a confined space can increase indoor air pressure, reducing fresh air intake efficiency. Existing technologies have attempted to add exhaust vents to the fresh air fan's inlet and volute chambers, and employ dual-outlet centrifugal fans to achieve synchronized air intake and exhaust. However, such designs require independent motors and flow guides for each vent, resulting in high costs, complex air ducts, and significant air volume loss. This is particularly true for top-down air conditioners, where the air supply vents are located at the top and bottom. Conventional fresh air fans typically have their exhaust inlet located at the bottom. When the air conditioner is in bottom-out mode, the fresh air fan can easily draw in and discharge the air just cooled or heated, resulting in energy waste and ineffective temperature control. The same problem persists in the upper space if the air conditioner is switched to top-out mode. While some solutions attempt to optimize the airflow path by rotating filters or adding damper structures, these solutions cannot achieve dynamic clearance between the exhaust inlet and the air conditioner's top and bottom outlets within the confined space, and they also lack adaptive control capabilities for multiple operating conditions. Therefore, there is an urgent need for a compact fresh air module suitable for top and bottom air-discharging air conditioners, which can dynamically adjust the exhaust path with a simple structure to avoid conflict with the air supply air flow of the air conditioner. Summary of the Invention

[0003] In view of this, the present invention provides a fresh air system, an air conditioner using the same, and a control method, which can not only achieve the effect of exhausting indoor air to reduce pressure, but also prevent the cold / hot air just blown out by the air conditioner from being discharged.

[0004] In order to solve the above problems, according to one aspect of the present application, an embodiment of the present invention provides a fresh air system, which is applied to an air conditioner with upper and lower air outlets, and the fresh air system includes a connected air inlet chamber assembly and a volute assembly; it also includes a first air door, a second air door, a third air door and a fourth air door, the first air door is arranged at the connection between the air inlet chamber assembly and the volute assembly, the second air door and the third air door are respectively arranged at the upper and lower ends of the air inlet chamber assembly, and the fourth air door is located on the volute assembly; wherein, the first air door has a first state of connecting the air inlet chamber assembly and the outdoors, and a second state of connecting the volute assembly and the outdoors.

[0005] In some embodiments, the air inlet chamber assembly includes an air inlet chamber cover and an air inlet chamber shell, wherein the air inlet chamber cover is arranged on the air inlet chamber shell and an air inlet chamber is formed between the two; wherein the second air gate and the third air gate are respectively arranged at the upper and lower ends of the air inlet chamber shell.

[0006] In some embodiments, the volute assembly includes a centrifugal volute and a centrifugal impeller, and the centrifugal impeller is installed in the centrifugal volute; the air inlet chamber housing is connected to the centrifugal volute, and the volute cavity of the centrifugal volute is connected to the air inlet chamber.

[0007] In some embodiments, the fresh air system further includes a filter assembly, which is nested in the air inlet chamber assembly.

[0008] In some embodiments, the filter assembly includes a filter bracket and a filter, the filter bracket is fixed in the air inlet chamber assembly, and the filter is detachably installed in the filter bracket.

[0009] In some embodiments, the second damper is configured to connect the air inlet chamber assembly with the indoor environment when opened, and block the air inlet chamber assembly from the indoor environment when closed; the third damper is configured to connect the air inlet chamber assembly with the indoor environment when opened, and block the air inlet chamber assembly from the indoor environment when closed.

[0010] In some embodiments, the fourth damper is configured to connect the volute assembly with the indoor environment when opened, and to block the volute assembly from the indoor environment when closed.

[0011] In some embodiments, the fresh air system has a fresh air mode, an exhaust mode, and a purification mode; wherein, in the fresh air mode, the first damper is in a first state, the fourth damper is open, and the second damper and the third damper are closed; in the exhaust mode, the first damper is in a second state, the fourth damper is closed, and the second damper or the third damper is opened based on the air outlet direction of the air conditioner; in the purification mode, the first damper is in a first state, the fourth damper is open, and the second damper is opened while the third damper is closed;

[0012] Among them, the exhaust mode includes: when the air conditioner is in the upward air outlet, opening the third air door and closing the second air door; when the air conditioner is in the downward air outlet, opening the second air door and closing the third air door; when the air conditioner is turned off, opening the second air door and the third air door at the same time.

[0013] In some embodiments, the fresh air system further includes a control component, an air pressure collector, a carbon dioxide sensor, and a particulate matter sensor. The control component is connected to the air pressure collector, the carbon dioxide sensor, and the particulate matter sensor, respectively, and is configured as follows:

[0014] When the indoor air pressure value collected by the air pressure collector is greater than the air pressure threshold and the air conditioner is blowing upward: open the third air door and close the second air door; when the indoor air pressure value is greater than the air pressure threshold and the air conditioner is blowing downward: open the second air door and close the third air door; when the indoor air pressure value is greater than the air pressure threshold and the air conditioner is turned off, open the second air door and the third air door at the same time;

[0015] When the carbon dioxide concentration collected by the carbon dioxide sensor is greater than the carbon dioxide concentration threshold, starting the fresh air mode;

[0016] When the concentration of particulate matter collected by the particulate matter sensor is greater than a particulate matter concentration threshold, the purification mode is activated.

[0017] According to another aspect of the present application, an embodiment of the present invention provides an air conditioner, which includes the above-mentioned fresh air system.

[0018] According to another aspect of the present application, an embodiment of the present invention provides a method for controlling an air conditioner, the method being used to control the above-mentioned air conditioner, the method comprising:

[0019] S1. Real-time acquisition of indoor air pressure, carbon dioxide concentration, particulate matter concentration, and air conditioning status;

[0020] S2. If the carbon dioxide concentration is greater than the carbon dioxide concentration threshold, start the fresh air mode until the carbon dioxide concentration is no greater than the carbon dioxide concentration threshold; if the indoor air pressure is greater than the air pressure threshold, start the exhaust mode until the air pressure is no greater than the air pressure threshold;

[0021] Otherwise, if the particle concentration value is greater than the particle concentration threshold, the purification mode is activated until the particle concentration value is no greater than the particle concentration threshold;

[0022] Wherein, the starting exhaust mode includes:

[0023] When the air conditioner is in upward air outlet mode, the third air door is opened and the second air door is closed;

[0024] When the air conditioner is in downward air flow mode, the second air door is opened and the third air door is closed;

[0025] When the air conditioner is turned off, the second damper and the third damper are opened at the same time.

[0026] In some embodiments, starting the fresh air mode includes: closing the second air door and the third air door, switching the first air door to the first state, and opening the fourth air door; starting the exhaust mode includes: closing the fourth air door, switching the first air door to the second state, and adjusting the third air door and the second air door according to the state of the air conditioner; starting the purification mode includes: opening the second air door and the fourth air door, switching the first air door to the first state, and closing the third air door.

[0027] Compared with the prior art, the fresh air system of the present invention has at least the following beneficial effects:

[0028] The fresh air system provided by the present invention is applied to an air conditioner with upper and lower air outlets, and the fresh air system includes a connected air inlet chamber assembly and a volute assembly; it also includes a first air door, a second air door, a third air door and a fourth air door, the first air door is arranged at the connection between the air inlet chamber assembly and the volute assembly, the second air door and the third air door are respectively arranged at the upper and lower ends of the air inlet chamber assembly, and the fourth air door is located on the volute assembly; wherein, the first air door has a first state connecting the air inlet chamber assembly and the outdoors, and a second state connecting the volute assembly and the outdoors.

[0029] In the present invention, firstly, the second damper and the third damper are designed to be located at the top and the bottom, so that the exhaust air inlet can be dynamically selected: when the air conditioner is discharging air downward, the third damper at the bottom is closed and the second damper at the top is enabled to let in air, avoiding the air supply outlet of the bottom air conditioner; when the air conditioner is discharging air upward, the second damper at the top is closed and the third damper at the bottom is enabled to let in air, avoiding the air supply outlet of the top air conditioner, completely avoiding the inhalation of the air flow that has just been cooled / heated by the air conditioner, eliminating energy waste and temperature control failure; secondly, only four dampers are used in conjunction with a fan with a single volute component to achieve multi-path switching, replacing the complex air duct structure controlled by traditional independent motors, significantly reducing costs and air volume losses; finally, the dual-state design of the first damper realizes the hardware reuse of fresh air introduction and exhaust air export, and the fourth damper directly controls the indoor air supply channel, and completes the dynamic adjustment of the airflow direction without the need for a guide plate, meeting the requirements of a compact structure.

[0030] The air conditioner provided by the present invention is designed based on the above-mentioned fresh air system. Its beneficial effects can be found in the beneficial effects of the above-mentioned fresh air system, which will not be described in detail here.

[0031] The control method of the air conditioner provided by the present invention is designed based on the above-mentioned air conditioner. Its beneficial effects refer to the beneficial effects of the above-mentioned air conditioner and are not described in detail here.

[0032] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is an exploded view of a fresh air system provided by an embodiment of the present invention;

[0035] Figure 2 This is a partial exploded view of a fresh air system provided by an embodiment of the present invention;

[0036] Figure 3 1 is a structural diagram of a fresh air system provided by an embodiment of the present invention when a first damper is in a first state;

[0037] Figure 4 1 is a structural diagram of a fresh air system provided by an embodiment of the present invention when the first damper is in the second state;

[0038] Figure 5 This is a structural schematic diagram of a fresh air system provided by an embodiment of the present invention when the second damper is open;

[0039] Figure 6 1 is a structural diagram of a fresh air system provided by an embodiment of the present invention when the second damper is closed;

[0040] Figure 7 This is a structural schematic diagram of a fresh air system provided by an embodiment of the present invention when the third damper is open;

[0041] Figure 8 This is a structural schematic diagram of a fresh air system provided by an embodiment of the present invention when the third damper is closed;

[0042] Figure 9 This is a structural schematic diagram of a fresh air system provided by an embodiment of the present invention when the fourth damper is open;

[0043] Figure 10 This is a structural diagram of a fresh air system provided by an embodiment of the present invention when the fourth damper is closed;

[0044] Figure 11 1 is a structural diagram of a fresh air system provided by an embodiment of the present invention;

[0045] Figure 12 This is a structural schematic diagram of a fresh air system provided by an embodiment of the present invention from another angle;

[0046] Figure 13 1 is a structural diagram of a fresh air system provided by an embodiment of the present invention, in which the third damper and the fourth damper are in an open state;

[0047] Figure 14 This is a state diagram of a first damper and a second damper when an air conditioner provided by an embodiment of the present invention is in a fresh air mode;

[0048] Figure 15 This is a state diagram of the third damper and the fourth damper when the air conditioner provided by an embodiment of the present invention is in fresh air mode;

[0049] Figure 16 This is a state diagram of a first damper and a second damper when an air conditioner provided by an embodiment of the present invention is in an upper air outlet exhaust mode;

[0050] Figure 17 This is a state diagram of the third damper and the fourth damper when the air conditioner provided by an embodiment of the present invention is in an upper air outlet exhaust mode;

[0051] Figure 18 This is a state diagram of a first damper and a second damper when an air conditioner provided by an embodiment of the present invention is in a downward air discharge mode;

[0052] Figure 19 This is a state diagram of the third damper and the fourth damper when the air conditioner provided by an embodiment of the present invention is in a downward air discharge mode;

[0053] Figure 20 This is a state diagram of a first damper and a second damper in exhaust mode when the air conditioner is in an off state in an air conditioner provided by an embodiment of the present invention;

[0054] Figure 21 This is a state diagram of the third damper and the fourth damper in the exhaust mode when the air conditioner is in the off state in an air conditioner provided by an embodiment of the present invention;

[0055] Figure 22 This is a state diagram of a first damper and a second damper when an air conditioner provided by an embodiment of the present invention is in a purification mode;

[0056] Figure 23 This is a state diagram of the third damper and the fourth damper when the air conditioner provided by an embodiment of the present invention is in a purification mode;

[0057] Figure 24 is a structural schematic diagram of an air conditioner provided by an embodiment of the present invention;

[0058] Figure 25 This is a flow chart of a method for controlling an air conditioner provided by an embodiment of the present invention.

[0059] in:

[0060] 1. Air inlet chamber assembly; 11. Air inlet chamber cover; 12. Air inlet chamber housing; 13. Air inlet chamber; 2. Volute assembly; 21. Centrifugal volute; 22. Centrifugal impeller; 23. Volute chamber; 3. First damper; 4. Second damper; 5. Third damper; 6. Fourth damper; 7. Filter assembly; 71. Filter bracket; 72. Filter. DETAILED DESCRIPTION

[0061] To further illustrate the technical means and effects employed by the present invention to achieve its intended objectives, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention is provided in conjunction with the accompanying drawings and preferred embodiments. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0062] In the description of the present invention, it should be clarified that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence; the terms "vertical", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "horizontal", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, and do not mean that the devices or elements referred to must have a specific direction or position, and therefore cannot be understood as limiting the present invention.

[0063] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0064] Example 1

[0065] This embodiment provides a fresh air system, which is applied to an air conditioner with up and down air outlets, such as Figure 1-Figure 24 As shown, the fresh air system includes an air inlet chamber assembly 1 and a volute assembly 2 connected; and further includes a first damper 3, a second damper 4, a third damper 5 and a fourth damper 6. The first damper 3 is arranged at the connection between the air inlet chamber assembly 1 and the volute assembly 2, the second damper 4 and the third damper 5 are respectively arranged at the upper and lower ends of the air inlet chamber assembly 1, and the fourth damper 6 is located on the volute assembly 2; wherein, as Figure 3 and Figure 4 As shown, the first damper 3 has a first state in which the air inlet chamber assembly 1 is connected to the outside of the room, and a second state in which the volute assembly 2 is connected to the outside of the room.

[0066] The air inlet chamber assembly 1 is directly adjacent to the volute assembly 2, and the first damper 3 is installed at the junction of the two; the second damper 4 is arranged at the top opening position of the air inlet chamber assembly 1, and the third damper 5 is vertically arranged at the bottom opening position of the air inlet chamber assembly 1; the fourth damper 6 is independently arranged on the shell surface of the volute assembly 2 facing the room; all dampers are movably connected to the corresponding cavity through a rotating shaft mechanism to form airflow control.

[0067] In this embodiment, the air inlet chamber assembly 1 collects airflow sources from the outdoor or indoor areas; the volute assembly 2 drives the directional delivery of airflow through a built-in centrifugal fan; the first damper 3 selects to connect the air inlet chamber assembly 1 to the outdoor channel or the volute assembly 2 to the outdoor channel through state switching; the second damper 4 controls the air flow interruption between the top of the air inlet chamber assembly 1 and the indoor area; the third damper 5 controls the air flow interruption between the bottom of the air inlet chamber assembly 1 and the indoor area; the fourth damper 6 controls the opening and closing of the air supply channel from the volute assembly 2 to the indoor area.

[0068] When the first damper 3 switches to the first state to connect the air inlet chamber assembly 1 with the outside, and the fourth damper 6 is opened, a fresh air path is formed from the outside → the air inlet chamber assembly 1 → the volute assembly 2 → the inside of the room. Figure 14 and Figure 15 As shown; when the first damper 3 switches to the second state to connect the volute assembly 2 with the outside, if the second damper 4 is opened, the top exhaust path is formed: indoor → second damper 4 → air inlet chamber assembly 1 → volute assembly 2 → outdoor, as shown Figure 16 and Figure 17 If the third damper 5 is opened, the bottom exhaust path is formed: indoor → third damper 5 → air inlet chamber assembly 1 → volute assembly 2 → outdoor, as shown in FIG. Figure 18 and Figure 19 In addition, when the air conditioner is in high-efficiency exhaust mode, the second damper 4 and the third damper 5 are opened at the same time, as shown in FIG. Figure 20 and Figure 21 shown.

[0069] In response to the technical problems in the background technology, firstly, the second damper 4 and the third damper 5 are designed to be located at the top and the bottom respectively, so that the exhaust air inlet can dynamically select the direction: when the air conditioner is discharging air downward, the bottom third damper 5 is closed and the top second damper 4 is enabled to let in air, avoiding the bottom air conditioner supply outlet; when the air conditioner is discharging air upward, the top second damper 4 is closed and the bottom third damper 5 is enabled to let in air, avoiding the top air conditioner supply outlet, completely avoiding the inhalation of the air flow that has just been cooled / heated by the air conditioner, eliminating energy waste and temperature control failure; secondly, only four dampers are used in conjunction with a fan with a single volute assembly 2 to achieve multi-path switching, replacing the complex air duct structure controlled by traditional independent motors, significantly reducing costs and air volume losses; finally, the dual-state design of the first damper 3 realizes the hardware reuse of fresh air introduction and exhaust air export, and the fourth damper 6 directly controls the indoor air supply channel, and completes the dynamic adjustment of the airflow direction without the need for a guide plate, meeting the requirements of a compact structure.

[0070] In a specific embodiment, the air inlet chamber assembly 1 includes an air inlet chamber cover 11 and an air inlet chamber shell 12, wherein the air inlet chamber cover 11 is covered on the air inlet chamber shell 12 and an air inlet chamber 13 is formed therebetween; wherein the second air gate 4 and the third air gate 5 are respectively arranged at the upper and lower ends of the air inlet chamber shell 12.

[0071] The air inlet chamber cover 11 covers the air inlet chamber housing 12 and is fixedly connected by screws, forming a sealed air inlet chamber 13 between the two. A second damper 4 is installed at the top opening of the air inlet chamber housing 12, and a third damper 5 is installed at the bottom opening, making the air inlet chamber 13 the core air flow connecting the dampers. When the second damper 4 is open, the indoor air flows through the second damper 4 into the air inlet chamber 13; when the third damper 5 is open, the indoor air flows through the third damper 5 into the air inlet chamber 13; when the first damper 3 is connected to the outside, the outdoor air flows through the first damper 3 into the air inlet chamber 13. The air inlet chamber 13 always serves as an airflow mixing and temporary storage area, directing the collected airflow to the volute assembly 2.

[0072] In this embodiment, the second damper 4 and the third damper 5 are directly integrated at the upper and lower ends of the air inlet chamber shell 12 to ensure that the air flow path is shortened when the exhaust air inlet is misaligned with the air supply outlet of the air conditioner; the closed structure of the air inlet chamber 13 avoids air flow leakage and improves the air flow control accuracy when the dampers are switched.

[0073] In a specific embodiment, the volute assembly 2 includes a centrifugal volute 21 and a centrifugal impeller 22, and the centrifugal impeller 22 is installed in the centrifugal volute 21; the air inlet chamber housing 12 is connected to the centrifugal volute 21, and the volute cavity 23 of the centrifugal volute 21 is connected to the air inlet chamber 13.

[0074] The centrifugal volute 21 is fixedly connected to the air inlet chamber housing 12 by screws to form a continuous air duct. The centrifugal impeller 22 is coaxially installed in the internal cavity of the centrifugal volute 21 and is driven to rotate by a motor. The volute cavity 23 of the centrifugal volute 21 is directly connected to the air inlet chamber 13 to form a one-way airflow channel. The centrifugal volute 21 constructs a closed volute cavity 23 and provides a spiral airflow expansion channel to convert the kinetic energy generated by the centrifugal impeller 22 into static pressure. The centrifugal impeller 22, as the core power component, generates negative pressure by rotation to attract the airflow from the air inlet chamber 13 into the volute cavity 23, and at the same time accelerates the airflow to the target outlet. The centrifugal impeller 22 is driven by the motor to rotate at high speed, forming a negative pressure area at the entrance of the volute cavity 23, continuously sucking the airflow from the air inlet chamber 13. After entering the volute cavity 23, the airflow is accelerated and pressurized by the centrifugal impeller 22 along the spiral channel, and is finally transported to the outdoors or indoors according to the guidance of the first damper 3 or the fourth damper 6.

[0075] In this embodiment, the compact integration of the centrifugal impeller 22 and the centrifugal volute 21 enables a single fan to drive multi-mode airflow (fresh air / exhaust air / purification), significantly reducing energy consumption and noise; the design of the volute cavity 23 directly connected to the air inlet cavity 13 eliminates the traditional guide structure and reduces airflow loss; the spiral air duct improves the static pressure conversion efficiency and ensures long-distance air delivery capability.

[0076] In a specific embodiment, the fresh air system further includes a filter assembly 7, which is nested in the air inlet chamber assembly 1. The filter assembly 7 includes a filter bracket 71 and a filter 72. The filter bracket 71 is fixed in the air inlet chamber assembly 1, and the filter 72 is detachably mounted in the filter bracket 71.

[0077] Filter holder 71 is fixedly nested within the internal frame of the air inlet housing 12 of the air inlet chamber assembly 1. Filter 72 is horizontally insertable and removable within filter holder 71, forming a nested assembly. Filter holder 71 provides a rigid support framework and ensures alignment of filter 72 with the airflow path of the air inlet chamber 13. Filter 72, acting as a filter medium, directly intercepts particulate matter in the airflow, providing the core purification function in air purification mode.

[0078] In this embodiment, all air flows through the air inlet chamber 13 vertically penetrate the filter 72, the pollutants are intercepted by the filter material, and the purified air flow continues to flow to the volute assembly 2; when the filter 72 needs to be replaced, it is horizontally pulled out along the guide rail of the filter bracket 71, and reinserted after maintenance to restore its function.

[0079] In addition, the filter 72 is a HEPA net, and the rigid fixation of the filter bracket 71 ensures that the HEPA net fits the entire cross-section of the airflow channel to prevent leakage of unfiltered airflow; the detachable design makes the replacement operation of the high-density HEPA net convenient and maintains long-term purification efficiency; the HEPA net directly processes the indoor circulating air in purification mode without the need for an additional rotating mechanism, reducing the failure rate and extending the maintenance cycle.

[0080] In a specific embodiment, the second damper 4 is configured to connect the air inlet chamber assembly 1 with the indoor environment when opened, and block the air inlet chamber assembly 1 from the indoor environment when closed; the third damper 5 is configured to connect the air inlet chamber assembly 1 with the indoor environment when opened, and block the air inlet chamber assembly 1 from the indoor environment when closed.

[0081] The second damper 4 is mounted on the top opening edge of the air inlet chamber shell 12 via a rotating shaft, and its valve plate area completely covers the top opening cross-section; when the second damper 4 is driven by the motor to rotate to the open state, the valve plate plane is parallel to the airflow direction, so that the air inlet chamber 13 is directly connected to the indoor environment through the top opening; when it is rotated to the closed state, the valve plate plane is perpendicular to the airflow direction and tightly fits the sealing surface of the air inlet chamber shell 12, completely blocking the airflow exchange between the air inlet chamber 13 and the room. The third damper 5 is mounted on the bottom opening edge of the air inlet chamber shell 12 via a rotating shaft, and its valve plate size matches the bottom opening; when the third damper 5 is open, the valve plate is parallel to the airflow direction to form a bottom through-channel between the air inlet chamber 13 and the indoor environment; when closed, the valve plate is perpendicular to the airflow direction and pressed against the sealing surface of the air inlet chamber shell 12, achieving physical isolation of the bottom airflow.

[0082] The independent control (fully open / fully closed) of the second damper 4 and the third damper 5 provides a directional air intake option for the exhaust mode. When the air conditioner is discharging air downward, the third damper 5 is closed and the second damper 4 is opened, forcing the exhaust air flow from the top away from the air conditioner air outlet; when the air conditioner is discharging air upward, the second damper 4 is closed and the third damper 5 is opened, so that the exhaust air intake path avoids the top air conditioner airflow; at the same time, the control logic is simplified, and the corresponding damper action can be triggered by only detecting the air outlet direction of the air conditioner, thereby reducing the complexity of the system.

[0083] In a specific embodiment, the fourth damper 6 is configured to connect the volute assembly 2 with the indoor environment when opened, and to block the volute assembly 2 from the indoor environment when closed.

[0084] The fourth damper 6 is installed on the shell surface of the volute assembly 2 facing the indoor environment through a rotating shaft, and its valve plate completely covers the indoor air supply port section of the volute cavity 23; when the fourth damper 6 is opened, the valve plate rotates to a direction parallel to the air flow, so that the volute cavity 23 forms a through channel with the indoor environment through the air supply port; when closed, the valve plate rotates to a direction perpendicular to the air flow and presses the sealing surface of the volute assembly 2, completely blocking the air flow exchange between the volute cavity 23 and the indoor environment. The independent opening and closing control of the fourth damper 6 provides a key guarantee for different modes. When the fresh air mode is turned on, it ensures that the outdoor purified air flow is sent into the room in one direction; when the exhaust mode is turned off, it prevents the exhaust air flow of the volute cavity 23 from leaking back into the room; when the air purification mode is turned on, it cooperates with the second damper 4 to form a closed indoor circulation duct, so that the air flow is forced to flow through the filter 72 to achieve efficient purification, while avoiding short-circuiting of unfiltered air.

[0085] In a specific embodiment, the fresh air system has a fresh air mode, an exhaust mode and a purification mode; wherein, in the fresh air mode, the first damper 3 is in a first state, the fourth damper 6 is open, and the second damper 4 and the third damper 5 are closed; in the exhaust mode, the first damper 3 is in a second state, the fourth damper 6 is closed, and the second damper 4 or the third damper 5 is opened based on the air outlet direction of the air conditioner; in the purification mode, the first damper 3 is in a first state, the fourth damper 6 is opened, and the second damper 4 is opened while the third damper 5 is closed; wherein, the exhaust mode includes: when the air conditioner is outlet from the top, the third damper 5 is opened and the second damper 4 is closed; when the air conditioner is outlet from the bottom, the second damper 4 is opened and the third damper 5 is closed; when the air conditioner is off, the second damper 4 and the third damper 5 are opened at the same time.

[0086] In fresh air mode, Figure 14 and Figure 15 As shown, the first damper 3 switches to the first state to connect the air inlet chamber assembly 1 with the outdoor channel, the fourth damper 6 is opened, and the second damper 4 and the third damper 5 are both closed; the air flow path is: outdoor → first damper 3 → air inlet chamber assembly 1 → volute assembly 2 → fourth damper 6 → indoor.

[0087] In exhaust mode, Figures 16-21As shown, the first damper 3 switches to the second state to connect the volute assembly 2 with the outdoor channel, and the fourth damper 6 is closed; if the air conditioner is discharging air from the top, the third damper 5 is opened and the second damper 4 is closed, and the air flow path is: indoor → third damper 5 → air inlet chamber assembly 1 → volute assembly 2 → first damper 3 → outdoor; if the air conditioner is discharging air from the bottom, the second damper 4 is opened and the third damper 5 is closed, and the air flow path is: indoor → second damper 4 → air inlet chamber assembly 1 → volute assembly 2 → first damper 3 → outdoor; if the air conditioner is turned off, the second damper 4 and the third damper 5 are opened at the same time, and the air flow path is: indoor → second damper 4 and third damper 5 → air inlet chamber assembly 1 → volute assembly 2 → first damper 3 → outdoor.

[0088] In purification mode, Figure 22 and Figure 23 As shown, the first damper 3 is in the first state, the fourth damper 6 is open, the second damper 4 is open and the third damper 5 is closed; the air flow path is: indoor → second damper 4 → air inlet chamber assembly 1 → volute assembly 2 → fourth damper 6 → indoor.

[0089] This embodiment accurately controls three modes through the combination of damper states, among which the fresh air mode realizes the efficient introduction of outdoor air; the exhaust mode dynamically selects the second damper 4 or the third damper 5 to inlet air according to the air outlet direction of the air conditioner, ensuring that the exhaust air inlet always avoids the upper and lower air outlets of the air conditioner (the third damper 5 at the bottom avoids the top when the air is out of the upper part, and the second damper 4 at the top avoids the bottom when the air is out of the lower part), completely preventing the cooling / heating air flow of the air conditioner from being discharged by mistake; the purification mode forms a closed-loop internal circulation path; when the air conditioner is turned off, the double dampers are opened to enhance the exhaust efficiency; all modes are realized through only four damper state combinations, and the control logic is simple and reliable.

[0090] In a specific embodiment, the fresh air system also includes a control component, an air pressure collector, a carbon dioxide sensor and a particulate matter sensor. The control component is connected to the air pressure collector, the carbon dioxide sensor and the particulate matter sensor, respectively, and is configured as follows: when the indoor air pressure value collected by the air pressure collector is greater than the air pressure threshold and the air conditioner is blowing out from the top: open the third air damper 5 and close the second air damper 4; when the indoor air pressure value is greater than the air pressure threshold and the air conditioner is blowing out from the bottom: open the second air damper 4 and close the third air damper 5; when the indoor air pressure value is greater than the air pressure threshold and the air conditioner is turned off, open the second air damper 4 and the third air damper 5 at the same time; when the carbon dioxide concentration collected by the carbon dioxide sensor is greater than the carbon dioxide concentration threshold, start the fresh air mode; when the particulate matter concentration collected by the particulate matter sensor is greater than the particulate matter concentration threshold, start the purification mode.

[0091] When the air pressure collector detects that the indoor air pressure exceeds the preset pressure threshold and the air conditioner is in the upper air outlet state, the control component drives the third damper 5 to rotate open and synchronously closes the second damper 4, forming an exhaust path with bottom air intake. When the air pressure is detected to be over the limit and the air conditioner is in the lower air outlet state, the control component opens the second damper 4 and closes the third damper 5, switching to a top air intake and exhaust path. When the air pressure exceeds the limit and the air conditioner is turned off, the control component opens the second damper 4 and the third damper 5 simultaneously to achieve efficient exhaust from two air inlets. When the carbon dioxide sensor detects that the indoor carbon dioxide concentration exceeds the preset carbon dioxide concentration threshold, the control component executes the fresh air mode: it switches the first damper 3 to the first state to connect the air inlet chamber component 1 with the outside, opens the fourth damper 6, and closes the second damper 4 and the third damper 5, forcing the introduction of fresh air from the outside. When the particle sensor detects that the indoor particle concentration exceeds the preset particle concentration threshold, the control component automatically starts the purification mode: keep the first damper 3 in the first state, open the fourth damper 6 and the second damper 4, and close the third damper 5, forming a closed-loop purification cycle of indoor → second damper 4 → air inlet chamber component 1 → volute component 2 → fourth damper 6 → indoor.

[0092] This embodiment realizes precise automation of three core functions through the coordination of air pressure collector, carbon dioxide sensor, particulate matter sensor and control component: when the air pressure exceeds the limit, the opening and closing combination of the second damper 4 or the third damper 5 is dynamically selected according to the air conditioning status to ensure that the exhaust air inlet always avoids the air supply direction of the air conditioning; when the carbon dioxide exceeds the limit, it automatically switches to the fresh air mode to quickly dilute the pollutants; when the particulate matter exceeds the limit, the purification mode is seamlessly started; the entire process does not require human intervention, which completely solves the defect of "lack of multi-working condition adaptive control capability" in the background technology.

[0093] Example 2

[0094] This embodiment provides an air conditioner, which includes the fresh air system described in Example 1.

[0095] This embodiment integrates the fresh air system described in Example 1 into the air conditioner, so that the entire machine has a multi-mode air management capability of dynamically avoiding the supply air flow: when the air conditioner is discharging air upward, the fresh air system automatically selects the third damper 5 at the bottom as the exhaust air inlet to avoid the top supply air flow; when discharging air downward, it switches to the second damper 4 at the top to inlet air to avoid the bottom supply air flow, completely preventing the air that has just been cooled / heated by the air conditioner from being accidentally discharged, significantly improving temperature control efficiency and reducing energy consumption; at the same time, the compact structure of a single fan and four dampers realizes seamless switching of fresh air introduction, air pressure regulation and air purification, avoiding the complex air duct design of the traditional multi-motor system; and finally forms a new air-conditioning system that is energy-saving, compact and intelligently self-adaptive.

[0096] Example 3

[0097] This embodiment provides a method for controlling an air conditioner, and the method is used to control the air conditioner described in Example 2. Figure 25 As shown, the control method includes:

[0098] S1. Real-time acquisition of indoor air pressure, carbon dioxide concentration, particulate matter concentration, and air conditioning status;

[0099] S2. If the carbon dioxide concentration is greater than the carbon dioxide concentration threshold, start the fresh air mode until the carbon dioxide concentration is no greater than the carbon dioxide concentration threshold; if the indoor air pressure is greater than the air pressure threshold, start the exhaust mode until the air pressure is no greater than the air pressure threshold;

[0100] Otherwise, if the particle concentration value is greater than the particle concentration threshold, the purification mode is activated until the particle concentration value is no greater than the particle concentration threshold;

[0101] Wherein, the starting exhaust mode includes:

[0102] When the air conditioner is in upward air outlet mode, the third damper 5 is opened and the second damper 4 is closed;

[0103] When the air conditioner is in downward air flow mode, the second damper 4 is opened and the third damper 5 is closed;

[0104] When the air conditioner is turned off, the second damper 4 and the third damper 5 are opened at the same time.

[0105] In this embodiment, indoor environmental parameters (including the indoor air pressure value monitored by the air pressure collector, the carbon dioxide concentration monitored by the carbon dioxide sensor, and the particulate matter concentration monitored by the particulate matter sensor) and the air conditioner operating status (upward airflow / downward airflow / off) are continuously collected in real time. Mode switching is then performed based on priority: if the carbon dioxide concentration exceeds a threshold, the fresh air mode is activated first; if the air pressure value exceeds a threshold, the exhaust mode is activated; if the particulate matter concentration exceeds a threshold and none of the above conditions are met, the purification mode is activated.

[0106] Fully automatic control is achieved through a multi-parameter priority decision-making mechanism (CO2 > air pressure > particulate matter), ensuring that core indoor air quality issues are prioritized. In exhaust mode, the second damper 4 or third damper 5 is dynamically invoked to ensure that the air inlet always precisely avoids the upper and lower air outlets of the air conditioner (the bottom third damper 5 avoids the top for upper air outlet, and the top second damper 4 avoids the bottom for lower air outlet), completely eliminating the mis-discharge of hot and cold air from the air conditioner. The mode switching logic is strictly matched to the damper action, achieving the dual goals of energy conservation and temperature control stability with the lowest hardware cost. In addition, the particle sensor monitors the concentration of particulate matter (PM2.5).

[0107] In a specific embodiment, starting the fresh air mode includes: Figure 14 and Figure 15As shown, the second damper 4 and the third damper 5 are closed, the first damper 3 is switched to the first state, and the fourth damper 6 is opened; starting the exhaust mode includes: Figures 16-21 As shown, closing the fourth damper 6, switching the first damper 3 to the second state, and adjusting the third damper 5 and the second damper 4 according to the state of the air conditioner; starting the purification mode includes: Figure 22 and Figure 23 As shown, the second damper 4 and the fourth damper 6 are opened, the first damper 3 is switched to the first state, and the third damper 5 is closed.

[0108] In this embodiment, when the fresh air mode is started, the second damper 4 and the third damper 5 are closed synchronously to block the backflow of indoor air, the first damper 3 is switched to the first state to connect the air inlet chamber assembly 1 with the outdoor channel, and the fourth damper 6 is opened to establish an air supply path from the volute assembly 2 to the indoor room; when the exhaust mode is started, the fourth damper 6 is closed to prevent reverse leakage of the air flow, the first damper 3 is switched to the second state to connect the volute assembly 2 with the outdoor exhaust channel, and at the same time, according to the upper air outlet state of the air conditioner, the third damper 5 is opened and the second damper 4 is closed to form a bottom air inlet path, or according to the lower air outlet state, the second damper 4 is opened and the third damper 5 is closed to form a top air inlet path, or according to the air conditioner off state, the second damper 4 and the third damper 5 are opened at the same time to enhance the exhaust efficiency; when the purification mode is started, the second damper 4 is opened to introduce indoor air, the fourth damper 6 is opened to form an indoor return outlet, the first damper 3 is switched to the first state, and the third damper 5 is closed to ensure that the air flow flows through the filter assembly 7 in one direction.

[0109] The core effect of this embodiment is to solidify the damper linkage rules of the three modes to achieve zero-conflict switching. In the exhaust mode, the air-conditioning status linkage mechanism of the third damper 5 and the second damper 4 completely avoids the misdischarge of cold and hot air flows of the air conditioner. In the purification mode, the air flow is forced to enter through the second damper 4 and return through the fourth damper 6 to ensure the integrity of the filtration. All modes achieve improved control reliability through only four damper status combinations.

[0110] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous technical features can be freely combined and superimposed.

[0111] The above are merely preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A fresh air system, applied to an air conditioner with upper and lower air outlets, comprising an air inlet chamber assembly and a volute assembly connected; characterized in that: It also includes a first damper, a second damper, a third damper and a fourth damper, the first damper is arranged at the connection between the air inlet chamber assembly and the volute assembly, the second damper and the third damper are respectively arranged at the upper and lower ends of the air inlet chamber assembly, and the fourth damper is located on the volute assembly; wherein, the first damper has a first state of connecting the air inlet chamber assembly with the outside, and a second state of connecting the volute assembly with the outside.

2. The fresh air system according to claim 1, characterized in that: The air inlet chamber assembly includes an air inlet chamber cover and an air inlet chamber shell, wherein the air inlet chamber cover is arranged on the air inlet chamber shell and an air inlet chamber is formed between the two; wherein the second air door and the third air door are respectively arranged at the upper and lower ends of the air inlet chamber shell.

3. The fresh air system according to claim 2, characterized in that: The volute assembly includes a centrifugal volute and a centrifugal impeller, and the centrifugal impeller is installed in the centrifugal volute; the air inlet chamber housing is connected to the centrifugal volute, and the volute cavity of the centrifugal volute is communicated with the air inlet chamber.

4. The fresh air system according to claim 1, characterized in that: The fresh air system further includes a filter assembly, which is nested in the air inlet cavity assembly.

5. The fresh air system according to claim 4, characterized in that: The filter assembly includes a filter bracket and a filter. The filter bracket is fixed in the air inlet chamber assembly, and the filter is detachably installed in the filter bracket.

6. The fresh air system according to claim 1, characterized in that: The second damper is configured to connect the air inlet chamber assembly with the indoor environment when opened, and block the air inlet chamber assembly from the indoor environment when closed; the third damper is configured to connect the air inlet chamber assembly with the indoor environment when opened, and block the air inlet chamber assembly from the indoor environment when closed.

7. The fresh air system according to claim 1, characterized in that: The fourth damper is configured to connect the volute assembly with the indoor environment when opened, and to block the volute assembly from the indoor environment when closed.

8. The fresh air system according to claim 1, characterized in that: The fresh air system has a fresh air mode, an exhaust mode, and a purification mode; wherein, in the fresh air mode, the first damper is in a first state, the fourth damper is open, and the second damper and the third damper are closed; in the exhaust mode, the first damper is in a second state, the fourth damper is closed, and the second damper or the third damper is opened based on the air outlet direction of the air conditioner; in the purification mode, the first damper is in a first state, the fourth damper is opened, and the second damper is opened while the third damper is closed; Among them, the exhaust mode includes: when the air conditioner is in the upward air outlet, opening the third air door and closing the second air door; when the air conditioner is in the downward air outlet, opening the second air door and closing the third air door; when the air conditioner is turned off, opening the second air door and the third air door at the same time.

9. The fresh air system according to claim 8, characterized in that: The fresh air system further includes a control component, an air pressure collector, a carbon dioxide sensor, and a particle sensor. The control component is connected to the air pressure collector, the carbon dioxide sensor, and the particle sensor, respectively, and is configured as follows: When the indoor air pressure value collected by the air pressure collector is greater than the air pressure threshold and the air conditioner is blowing upward: open the third air door and close the second air door; when the indoor air pressure value is greater than the air pressure threshold and the air conditioner is blowing downward: open the second air door and close the third air door; when the indoor air pressure value is greater than the air pressure threshold and the air conditioner is turned off, open the second air door and the third air door at the same time; When the carbon dioxide concentration collected by the carbon dioxide sensor is greater than the carbon dioxide concentration threshold, starting the fresh air mode; When the concentration of particulate matter collected by the particulate matter sensor is greater than a particulate matter concentration threshold, the purification mode is activated.

10. An air conditioner, characterized in that: The air conditioner includes the fresh air system according to any one of claims 1 to 9.

11. A method for controlling an air conditioner, characterized in that: The control method is used to control the air conditioner according to claim 10, and the control method includes: S1. Real-time acquisition of indoor air pressure, carbon dioxide concentration, particulate matter concentration, and air conditioning status; S2. If the carbon dioxide concentration is greater than the carbon dioxide concentration threshold, start the fresh air mode until the carbon dioxide concentration is no greater than the carbon dioxide concentration threshold; if the indoor air pressure is greater than the air pressure threshold, start the exhaust mode until the air pressure is no greater than the air pressure threshold; Otherwise, the fresh air mode is turned off. If the particle concentration value is greater than the particle concentration threshold, the purification mode is started until the particle concentration value is no greater than the particle concentration threshold. Wherein, the starting exhaust mode includes: When the air conditioner is in upward air outlet mode, the third air door is opened and the second air door is closed; When the air conditioner is in downward air flow mode, the second air door is opened and the third air door is closed; When the air conditioner is turned off, the second damper and the third damper are opened at the same time.

12. The air conditioner control method according to claim 11, characterized in that: Starting the fresh air mode includes: closing the second air door and the third air door, switching the first air door to the first state, and opening the fourth air door; starting the exhaust mode includes: closing the fourth air door, switching the first air door to the second state, and adjusting the third air door and the second air door according to the state of the air conditioner; starting the purification mode includes: opening the second air door and the fourth air door, switching the first air door to the first state, and closing the third air door.

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