An air supply system, an air conditioner and an air supply control method of the air conditioner

Abstract

The application provides an air supply system, an air conditioner and an air supply control method of the air conditioner, and belongs to the field of air conditioners. The air supply system comprises a volute, a double-suction centrifugal fan, an outdoor air path, an indoor inlet air path and an indoor outlet air path. The volute has a first air inlet, a second air inlet, a first air outlet and a second air outlet. The double-suction centrifugal fan is arranged in the volute and has axially opposite first and second air inlet surfaces. The outdoor air path can be in communication with the second air inlet or the second air outlet selectively. The indoor inlet air path is in communication with the first air inlet, and the indoor outlet air path is in communication with the first air outlet. Each air path can be controlled to be on or off, so that the air supply system has at least a new air introduction mode and an exhaust air mode. The application integrates the new air introduction and indoor exhaust air functions by using a single double-suction centrifugal fan, realizes one machine with multiple functions, effectively reduces the system structure complexity and manufacturing cost, and has a good energy-saving and consumption-reducing effect.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more specifically, to an air supply system, an air conditioner, and an air supply control method for an air conditioner. Background Technology

[0002] In the field of indoor ventilation, there is a dual need to both introduce fresh air into the room and exhaust indoor gases to the outside. For example, when the indoor air is polluted (e.g., there are odors, smoke, or flammable gases), it is necessary to exhaust the indoor gases in a timely manner; at the same time, it is desirable to introduce fresh outdoor air to improve indoor air quality.

[0003] In existing technologies, fresh air and exhaust functions are typically implemented using independent systems. Specifically, the supply air system has a separate fresh air fan and ductwork to draw in outdoor air, while the exhaust system has a separate exhaust fan and ductwork to expel indoor air outdoors. This approach has the following problems: First, the structure is redundant and the cost is high. The fresh air fan and the exhaust fan are set up independently, which results in a large internal space occupation and a large number of parts, which is not conducive to product miniaturization and cost control.

[0004] Second, the function switching is complex. The fresh air duct and the exhaust air duct are independent of each other, and it is impossible to achieve bidirectional switching of airflow direction on a single fan structure, resulting in low system control flexibility and integration. Summary of the Invention

[0005] This application provides an air supply system, an air conditioner, and an air supply control method for the air conditioner. The air supply system employs a dual-suction centrifugal fan with axially opposite first and second air inlets, and is equipped with a volute housing having four air outlets: a first air inlet, a second air inlet, a first air outlet, and a second air outlet. This allows a single fan to achieve axial air intake and radial air outlet on both sides. Simultaneously, by selectively connecting an outdoor air duct to either the second air inlet or the second air outlet, the same outdoor air duct can serve as both a channel for outdoor airflow to enter the fan and a channel for exhaust airflow to be discharged outdoors. The indoor air intake duct and indoor air outlet duct are respectively... The system utilizes a first air inlet and a first air outlet to achieve indoor air intake and exhaust. By controlling the on / off state of each air duct, it can switch between air supply mode one and air supply mode three, achieving a two-way function of introducing fresh outdoor air into the room and exhausting indoor air to the outside. Compared to the structural redundancy, high cost, and complex function switching issues caused by independently installed fresh air fans and exhaust fans, and independent fresh air ducts and exhaust ducts, this application integrates two-way air supply function with a single fan and achieves shared airflow in both directions through a single outdoor air duct. This effectively improves system integration, simplifies structural composition, reduces costs, and can flexibly meet the switching needs of various air supply scenarios. Specifically: This invention provides an air supply system, comprising: a volute having a first air inlet, a second air inlet, a first air outlet, and a second air outlet; a dual-suction centrifugal fan disposed within the volute, the dual-suction centrifugal fan having an axially opposite first air inlet surface and a second air inlet surface, respectively corresponding to the first air inlet and the second air outlet; an outdoor air duct connected to the outside and selectively connected to either the second air inlet or the second air outlet; an indoor air inlet air duct connected to the room and the first air inlet; and an indoor air outlet air duct connected to the room and the first air outlet; wherein each air duct can be controlled to open and close, so that the air supply system has at least: an air supply mode one, in which outdoor airflow enters the dual-suction centrifugal fan through the outdoor air duct and is delivered into the room from the first air outlet through the indoor air outlet air duct; and an air supply mode three, in which indoor airflow enters the dual-suction centrifugal fan through the indoor air inlet air duct and is discharged to the outside from the second air outlet through the outdoor air duct.

[0006] According to one embodiment of the present invention, the air supply system further includes: air supply mode two, wherein the outdoor air duct is connected to the second air inlet and closed to the second air outlet, and both the indoor air inlet air duct and the indoor air outlet air duct are open. At this time, the outdoor airflow and the indoor airflow enter the dual-suction centrifugal fan through the second air inlet and the first air inlet respectively, mix, and are then sent into the room from the first air outlet through the indoor air outlet air duct.

[0007] According to one embodiment of the present invention, the outdoor air duct has an outdoor connection end communicating with the outdoor environment, an outdoor air inlet end communicating with the second air inlet, and an outdoor air outlet end communicating with the second air outlet, wherein both the outdoor air inlet end and the outdoor air outlet end can be controlled to be switched on and off; the indoor air inlet duct has an indoor air inlet end communicating with the indoor environment and an indoor air inlet connection end communicating with the first air inlet, wherein at least one of the indoor air inlet end and the indoor air inlet connection end can be controlled to be switched on and off; the indoor air outlet duct has an indoor air outlet end communicating with the indoor environment and an indoor air outlet connection end communicating with the first air inlet. The indoor air outlet is connected to the air vent, and at least one of the indoor air outlet and the indoor air outlet connection can be controlled to be switched on and off; in the first air supply mode, the outdoor air inlet is open, the outdoor air outlet is closed, the indoor air inlet path is closed, and the indoor air outlet path is open; in the second air supply mode, the outdoor air inlet is open, the outdoor air outlet is closed, the indoor air inlet path is open, and the indoor air outlet path is open; in the third air supply mode, the outdoor air inlet is closed, the outdoor air outlet is open, the indoor air inlet path is open, and the indoor air outlet path is closed.

[0008] According to one embodiment of the present invention, the outdoor connection end and the outdoor air inlet end correspond to each other in the axial direction of the double-suction centrifugal fan; the indoor air inlet end and the indoor air inlet connection end correspond to each other in the radial direction of the double-suction centrifugal fan; and the indoor air outlet end and the indoor air outlet connection end correspond to each other in the axial direction of the double-suction centrifugal fan.

[0009] According to one embodiment of the present invention, the outdoor air inlet, the outdoor air outlet, and the indoor air outlet connection end are provided with damper structures, and the damper structures control the opening and closing of the corresponding ports; the indoor air inlet and the indoor air outlet are provided with grille structures, and the grille structures control the opening and closing of the corresponding ports.

[0010] According to one embodiment of the present invention, the air supply system further includes a fresh air duct, one end of which is connected to the outdoor connection terminal and the other end of which is connected to the outdoor environment.

[0011] The present invention also provides an air conditioner including the air supply system of the above embodiments.

[0012] According to one embodiment of the present invention, the air conditioner includes: an air quality sensor, at least configured to acquire indoor air quality parameters when the air conditioner executes the air supply mode three; and a controller, communicatively connected to the air quality sensor, configured to control whether the air conditioner continues to execute the air supply mode three based on the indoor air quality parameters; wherein the indoor air quality parameters include at least a combustible gas concentration parameter.

[0013] According to one embodiment of the present invention, the air conditioner further includes: an outdoor temperature sensor for acquiring an outdoor temperature value; an indoor temperature sensor for acquiring an indoor temperature value; the air conditioner has a fresh air intake program, wherein when the air conditioner activates the fresh air intake program, the controller controls the air conditioner to execute either air supply mode one or air supply mode two based on the temperature difference between the indoor and outdoor temperatures.

[0014] According to one embodiment of the present invention, the air conditioner is a cabinet air conditioner, the air supply system is located in the bottom area of ​​the cabinet air conditioner, and the air quality sensor is located in the bottom area of ​​the cabinet air conditioner.

[0015] The present invention also provides an air supply control method for an air conditioner, applied to the air conditioner of the above embodiments, the air supply control method comprising: in response to the start command of the air conditioner, controlling the air conditioner to supply air in the air supply mode three.

[0016] According to one embodiment of the present invention, the air supply control method further includes: when the air conditioner supplies air in the air supply mode three, determining whether the indoor air quality parameters meet the requirements, wherein the indoor air quality parameters include at least a combustible gas concentration parameter; if the requirements are met, controlling the air conditioner to exit the air supply mode three; otherwise, controlling the air conditioner to continue supplying air in the air supply mode three.

[0017] According to one embodiment of the present invention, the air supply control method further includes: responding to the fresh air intake program start command of the air conditioner and determining whether the absolute value of the temperature difference between the indoor and outdoor environments is greater than or equal to a preset temperature difference value; if so, controlling the air conditioner to execute the air supply mode two after the air supply mode three operation ends and exits; otherwise, controlling the air conditioner to execute the air supply mode one after the air supply mode three operation ends and exits.

[0018] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The air supply system in this embodiment employs a dual-suction centrifugal fan with axially opposite first and second air inlet surfaces, and is correspondingly configured with a volute having four air outlets: a first air inlet, a second air inlet, a first air outlet, and a second air outlet. This allows a single fan to achieve axial air intake and radial air exhaust on both sides. Simultaneously, by selectively connecting an outdoor air duct to either the second air inlet or the second air outlet, the same outdoor air duct can serve as both a channel for outdoor airflow to enter the fan and a channel for exhaust airflow to the outside. The indoor air intake and exhaust ducts correspond to the first air inlet and the first air outlet, respectively, to achieve indoor air intake and exhaust. Furthermore, by controlling the on / off state of each air duct, the system can switch between air supply mode one and air supply mode three, achieving a two-way function of introducing fresh outdoor air into the room and exhausting indoor air to the outside. This approach addresses the structural redundancy, high cost, and complex function switching issues caused by independently setting up fresh air fans and exhaust fans, and by having independent fresh air ducts and exhaust ducts. This application integrates fresh air intake and indoor exhaust functions through a single dual-suction centrifugal fan, achieving multiple uses in one unit, effectively reducing system structural complexity and manufacturing costs, improving the integration and intelligence level of building ventilation systems, and demonstrating good energy-saving and consumption-reducing effects. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the double-suction centrifugal fan in the embodiments of this application; Figure 2 This is a simplified schematic diagram of the air supply system in the embodiments of this application; Figure 3 This is a schematic diagram of the airflow path of the air supply system in the air supply mode in the embodiments of this application; Figure 4This is a schematic diagram of the airflow path of the air supply system in air supply mode two in the embodiments of this application. Figure 5 This is a schematic diagram of the airflow path of the air supply system in air supply mode three in the embodiments of this application. Figure 6 This is a schematic diagram of the air conditioner in the embodiment of this application from a frontal view. Figure 7 This is a schematic diagram of the air conditioner in the embodiment of this application from a side view. Figure 8 This is a schematic diagram of the airflow path of the air conditioner in air supply mode three in the embodiment of this application. Figure 9 This is a control logic diagram of the air conditioner in this application embodiment when it is turned on for the first time after being turned off; Figure 10 This is a control logic diagram for the air conditioner in this application embodiment to identify combustible gas during operation.

[0020] in: 10. Volute; 101. First air inlet; 102. Second air inlet; 103. First air outlet; 104. Second air outlet; 20. Double-suction centrifugal fan; 201. First air inlet surface; 202. Second air inlet surface; 30. Outdoor ventilation duct; 40. Indoor air intake duct; 50. Indoor air outlet duct; 60. Damper structure; 70. Grid structure; 80. Fresh air duct; 90. Air quality sensor; 100. Controller. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0023] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0024] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0025] Example like Figures 1-10 As shown, this application provides an air supply system, an air conditioner, and an air supply control method for the air conditioner, specifically: I. Overview of the Air Supply System This application provides an air supply system that can be applied to various scenarios requiring indoor ventilation, such as being installed as a stand-alone device in an indoor environment or integrated into air conditioning equipment such as air conditioners. The following description uses an application integrated into a cabinet air conditioner as an example; however, those skilled in the art should understand that the application scenarios of this air supply system are not limited to this.

[0026] II. Composition of the power mechanism of the air supply system The power mechanism of the air supply system includes a volute 10 and a double-suction centrifugal fan 20.

[0027] The volute 10 is the external housing structure of the double-suction centrifugal fan 20, and has a first air inlet 101, a second air inlet 102, a first air outlet 103, and a second air outlet 104. In one embodiment, the volute 10 can be formed by stamping metal sheet or injection molding plastic, and its interior forms a cavity to accommodate the double-suction centrifugal fan 20. The first air inlet 101 and the second air inlet 102 are arranged opposite each other on the axial sides of the volute 10, respectively corresponding to the first air inlet surface 201 and the second air inlet surface 202 of the double-suction centrifugal fan 20; the first air outlet 103 and the second air outlet 104 are arranged on the radial sides of the volute 10, and are used to discharge the airflow pressurized by the double-suction centrifugal fan 20.

[0028] A double-suction centrifugal fan 20 is disposed within a volute 10, having an axially opposed first inlet surface 201 and a second inlet surface 202. A "double-suction centrifugal fan" refers to a type of fan with two axial inlet surfaces, where airflow enters and is radially ejected. In one embodiment, the double-suction centrifugal fan 20 includes a motor, an impeller, and a fan shaft. The motor drives the fan shaft to rotate the impeller, and the first inlet surface 201 and the second inlet surface 202 are formed on both sides of the impeller. When the double-suction centrifugal fan 20 is running, airflow can enter the impeller axially from the first inlet surface 201 and / or the second inlet surface 202, be pressurized by the impeller, and then radially ejected from the outer edge of the impeller, and discharged through the first outlet 103 and / or the second outlet 104 of the volute 10.

[0029] It should be noted that "the airflow entering through the first air inlet 101 and / or the second air inlet 102 can be discharged through the first air outlet 103 and / or the second air outlet 104" means that when the double-suction centrifugal fan 20 is running, it can only have air intake and air outlet on one side (such as only air intake through the second air inlet 102 and air outlet through the first air outlet 103), or it can have air intake on both sides and air outlet on one side (such as air intake through the second air inlet 102 and air outlet 101 at the same time and air outlet through the first air outlet 103), or it can have air intake on one side and air outlet on both sides, depending on the on / off state of each air passage port.

[0030] III. Composition of the air supply system's airflow structure The air supply system's airflow structure includes an outdoor airflow path 30, an indoor air intake path 40, and an indoor air outlet path 50.

[0031] Outdoor ventilation duct 30 The outdoor air duct 30 has an outdoor connection end that connects to the outdoor environment, an outdoor air inlet end that connects to the second air inlet 102, and an outdoor air outlet end that connects to the second air outlet 104. "Outdoor connection end" refers to the interface end of the outdoor air duct 30 that connects to the outdoor environment; "outdoor air inlet end" refers to the interface end of the outdoor air duct 30 that connects to the second air inlet 102; and "outdoor air outlet end" refers to the interface end of the outdoor air duct 30 that connects to the second air outlet 104.

[0032] In one embodiment, the air supply system further includes a fresh air duct 80, one end of which is connected to an outdoor connection terminal and the other end is connected to the outdoor environment. The fresh air duct 80 can be made of materials such as PVC pipe, corrugated metal pipe, or composite flexible hose, and its cross-sectional shape can be circular, rectangular, or elliptical, depending on the installation space and air volume requirements.

[0033] "Both the outdoor air inlet and the outdoor air outlet can be controlled to open and close" means that the outdoor air inlet and the outdoor air outlet are respectively equipped with controllable opening and closing mechanisms, so that when the outdoor air inlet is open, the outdoor air passage 30 allows outdoor airflow to enter the second air inlet 102, and when the outdoor air outlet is open, the airflow is allowed to be discharged to the outside from the second air outlet 104, and the two will not be opened at the same time.

[0034] In one embodiment, damper structures 60 are provided at the outdoor air inlet and outdoor air outlet, and the damper structures 60 control the opening and closing of the corresponding ports. The damper structure 60 may include a baffle plate and a driving component. The baffle plate is rotatably or translationally disposed at the corresponding port, and the driving component is used to drive the baffle plate to open or close the port. The driving component may be a stepper motor, a servo motor, or an electromagnetic driver, etc. In one specific embodiment, the baffle plate is a plate-shaped structure. After receiving a signal from the controller, the stepper motor drives the baffle plate to rotate around a pivot. When the baffle plate rotates to be parallel to the plane where the port is located, the port is closed; when it rotates to be perpendicular to or inclined to the plane where the port is located, the port is opened.

[0035] Indoor air intake duct 40 The indoor air intake duct 40 has an indoor air intake end that communicates with the indoor environment and an indoor air intake connection end that communicates with the first air intake 101. The "indoor air intake end" refers to the interface end of the indoor air intake duct 40 that communicates with the indoor environment and is used for indoor airflow to enter; the "indoor air intake connection end" refers to the interface end of the indoor air intake duct 40 that communicates with the first air intake 101.

[0036] "At least one of the indoor air inlet and the indoor air inlet connection can be controlled to be switched on or off" means that a switching mechanism can be provided at the indoor air inlet, at the indoor air inlet connection, or both. In one embodiment, a switching mechanism is provided only at the indoor air inlet, while the indoor air inlet connection is normally open; in another embodiment, switching mechanisms are provided at both the indoor air inlet and the indoor air inlet connection to achieve more flexible control.

[0037] In one embodiment, a grille structure 70 is provided at the indoor air inlet, and the grille structure 70 controls the opening and closing of the corresponding port. The grille structure 70 may include a moving grille and a driving component. The moving grille may include multiple grille bars, and the driving component drives the grille bars to rotate or translate to open or close the grille. The driving component may be a stepper motor, a servo motor, or an electromagnetic driver, etc. In a specific embodiment, the moving grille has a louvered structure, and the stepper motor drives each grille bar to rotate synchronously. When the grille bar rotates to be parallel to the airflow direction, the grille opens; when it rotates to be perpendicular to the airflow direction, the grille closes.

[0038] Indoor air outlet duct 50 The indoor air outlet duct 50 has an indoor air outlet end that communicates with the indoor environment and an indoor air outlet connection end that communicates with the first air outlet 103. The "indoor air outlet end" refers to the interface end of the indoor air outlet duct 50 that communicates with the indoor environment and is used to send airflow into the room; the "indoor air outlet connection end" refers to the interface end of the indoor air outlet duct 50 that communicates with the first air outlet 103.

[0039] The meaning of "at least one of the indoor air outlet and the indoor air outlet connection can be controlled to be switched on or off" is similar to that of the indoor air intake path 40, and will not be repeated here.

[0040] In one embodiment, a grille structure 70 is provided at the indoor air outlet end, and a damper structure 60 is provided at the indoor air outlet connection end. The opening and closing of the corresponding ports are controlled by the grille structure 70 and the damper structure 60, respectively. In another embodiment, the grille structure 70 is only provided at the indoor air outlet end, and the indoor air outlet connection end is in a normally open state.

[0041] Explanation of the "correspondence" relationship The correspondence between the outdoor connection end and the outdoor air inlet end in the axial direction of the double-suction centrifugal fan 20 means that the outdoor connection end and the outdoor air inlet end are approximately located on the same axial side of the double-suction centrifugal fan 20, allowing outdoor airflow to enter the second air inlet 102 axially. Similarly, the correspondence between the indoor air inlet end and the indoor air inlet connection end in the radial direction of the double-suction centrifugal fan 20 means that the indoor air inlet end and the indoor air inlet connection end are approximately located on the same radial side of the double-suction centrifugal fan 20, allowing indoor airflow to enter the first air inlet 101 radially. Likewise, the correspondence between the indoor air outlet end and the indoor air outlet connection end in the axial direction of the double-suction centrifugal fan 20 means that the indoor air outlet end and the indoor air outlet connection end are approximately located on the same axial side of the double-suction centrifugal fan 20, allowing airflow to be delivered axially from the first air outlet 103 to the room. It should be noted that "correspondence" does not require strict geometric alignment, but rather refers to a corresponding relationship of airflow connectivity in the corresponding directions.

[0042] IV. Air Supply Mode The air supply system has at least one air supply mode and one air supply mode.

[0043] Air supply mode 1 (fresh air intake mode) like Figure 3 As shown, in the air supply mode, outdoor airflow enters the dual-suction centrifugal fan 20 through the outdoor air duct 30 and is then delivered into the room through the indoor air outlet 50 from the first air outlet 103. Specifically, in the air supply mode, the outdoor air inlet is open, the outdoor air outlet is closed, the indoor air inlet duct 40 is closed, and the indoor air outlet duct 50 is open. At this time, outdoor airflow enters the dual-suction centrifugal fan 20 through the outdoor air duct 30 and the second air inlet 102, and is then delivered into the room through the indoor air outlet 50 from the first air outlet 103. In this mode, the dual-suction centrifugal fan 20 only draws in air from the second air inlet side 202 and only discharges air from the first air outlet side 103, thus achieving the function of introducing fresh outdoor air into the room.

[0044] Air supply mode 3 (exhaust mode) like Figure 5 As shown, in air supply mode three, indoor airflow enters the dual-suction centrifugal fan 20 through the indoor air inlet duct 40 and is discharged to the outside through the outdoor air duct 30 from the second air outlet 104. Specifically, in air supply mode three, the outdoor air inlet is closed, the outdoor air outlet is open, the indoor air inlet duct 40 is open, and the indoor air outlet duct 50 is closed. At this time, indoor airflow enters the dual-suction centrifugal fan 20 through the indoor air inlet duct 40 and the first air inlet 101, and is discharged to the outside through the outdoor air duct 30 from the second air outlet 104. In this mode, the dual-suction centrifugal fan 20 only draws in air from the first air inlet side 201 and only discharges air from the second air outlet side 104, thus achieving the function of exhausting indoor air to the outside.

[0045] like Figure 4 As shown, the air supply system also has an air supply mode two (mixed air supply mode). In air supply mode two, the outdoor air duct 30 is connected to the second air inlet 102 and closed to the second air outlet 104. The indoor air inlet air duct 40 and the indoor air outlet air duct 50 are both open. At this time, the outdoor airflow and the indoor airflow enter the dual-suction centrifugal fan 20 through the second air inlet 102 and the first air inlet 101 respectively, mix, and are then sent into the room from the first air outlet 103 through the indoor air outlet air duct 50. Specifically, in air supply mode three, the outdoor air inlet is open, the outdoor air outlet is closed, the indoor air inlet air duct 40 is open, and the indoor air outlet air duct 50 is open. At this time, outdoor airflow enters the dual-suction centrifugal fan 20 through outdoor air duct 30 and the second air inlet 102, while indoor airflow enters the dual-suction centrifugal fan 20 through indoor air inlet duct 40 and the first air inlet 101. The two airflows mix within the dual-suction centrifugal fan 20 and are then delivered into the room through the first air outlet 103 and indoor air outlet duct 50. In this mode, the dual-suction centrifugal fan 20 simultaneously draws in air from both sides and discharges air from one side, achieving the function of mixing outdoor fresh air with indoor air before delivering it into the room. This avoids the direct introduction of outdoor fresh air with a large temperature difference, which could lead to localized overheating or cooling of the indoor environment.

[0046] V. Air Conditioner Implementation Methods The air conditioner includes the aforementioned air supply system. In one embodiment, the air conditioner is a floor-standing air conditioner, and the air supply system is located in the bottom area of ​​the floor-standing air conditioner. Locating the air supply system in the bottom area facilitates the removal of gases denser than air (such as R290 flammable refrigerant that deposits at the bottom after leakage), thus improving ventilation efficiency.

[0047] The air conditioner includes an air quality sensor 90 and a controller 100. The air quality sensor 90 is used at least to acquire indoor air quality parameters when the air conditioner is operating in air supply mode three. In one embodiment, the air quality sensor 90 is a combustible gas sensor used to detect the concentration of combustible gases indoors, such as R290 or liquefied petroleum gas. The air quality sensor 90 may be located in the bottom area of ​​the cabinet air conditioner, adjacent to the air supply system, to detect any accumulated combustible gases. The controller 100 is communicatively connected to the air quality sensor 90 and is used to control whether the air conditioner continues to operate in air supply mode three based on the indoor air quality parameters. The "communication connection" may be wired communication (e.g., via an electrical signal line) or wireless communication (e.g., via WiFi, Bluetooth, etc.).

[0048] The air conditioner also includes an outdoor temperature sensor and an indoor temperature sensor, used to acquire outdoor and indoor temperature values, respectively. The air conditioner has a fresh air intake program. When the fresh air intake program is activated, the controller 100 controls the air conditioner to execute either air supply mode one or air supply mode two based on the temperature difference between the indoor and outdoor temperatures. In one embodiment, the controller 100 calculates the absolute value of the difference between the outdoor and indoor temperatures. If this absolute value is greater than or equal to a preset temperature difference value (such as 5°C, 8°C, or 10°C, set by the factory or the user), then air supply mode two is executed, mixing outdoor fresh air with indoor air before introducing it, avoiding discomfort caused by excessive temperature difference. If the absolute value is less than the preset temperature difference value, then air supply mode one is executed, directly introducing outdoor fresh air.

[0049] VI. Air Supply Control Methods The air supply control method applied to the aforementioned air conditioner includes: in response to a start command from the air conditioner, controlling the air conditioner to supply air in air supply mode three. This start command can be a power-on command for the first time the air conditioner is powered on, or a command to power on again after being turned off. The purpose of starting in air supply mode three is to remove any combustible gases or other pollutants that may have accumulated indoors while the air conditioner is not powered on.

[0050] When the air conditioner is operating in air supply mode three, it is determined whether the indoor air quality parameters meet the requirements. The indoor air quality parameters include at least the combustible gas concentration parameter. "Meets the requirements" means that the combustible gas concentration is below a preset safety threshold. If the requirements are met, the air conditioner is controlled to exit air supply mode three; otherwise, the air conditioner is controlled to continue operating in air supply mode three. In one embodiment, the determination can be performed after the air supply mode three has been running for a preset duration (such as 3 minutes, 5 minutes, or 10 minutes) to avoid frequent detection.

[0051] In response to the air conditioner's fresh air intake program start command, the system determines whether the absolute value of the temperature difference between indoors and outdoors is greater than or equal to a preset temperature difference value. If so, the system controls the air conditioner to execute air supply mode two after exiting air supply mode three; otherwise, it controls the air conditioner to execute air supply mode one after exiting air supply mode three. This control logic ensures that both comfort and fresh air volume requirements are considered when introducing fresh air.

[0052] Those skilled in the art should understand that the sequence numbers or order of description of the various embodiments in this application are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. Furthermore, the above embodiments are only optional implementations of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0053] Those skilled in the art should also understand that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

Claims

1. An air supply system, characterized in that, include; The volute (10) has a first air inlet (101), a second air inlet (102), a first air outlet (103), and a second air outlet (104). A double-suction centrifugal fan (20) is disposed in the volute (10). The double-suction centrifugal fan (20) has a first air inlet surface (201) and a second air inlet surface (202) that are axially opposite to each other, corresponding to the first air inlet (101) and the second air inlet (102) respectively. The outdoor air duct (30) is connected to the outside and can be selectively connected to either the second air inlet (102) or the second air outlet (104); The indoor air intake duct (40) is connected to the indoor space and the first air intake (101); The indoor air outlet duct (50) is connected to the indoor space and the first air outlet (103); Each air path can be controlled to be switched on or off, so that the air supply system has at least the following characteristics: In the first air supply mode, the outdoor airflow enters the double-suction centrifugal fan (20) through the outdoor air path (30) and is sent into the room from the first air outlet (103) through the indoor air outlet path (50); In the third air supply mode, the indoor airflow enters the double-suction centrifugal fan (20) through the indoor air intake path (40) and is discharged to the outside through the outdoor air path (30) from the second air outlet (104).

2. The air supply system according to claim 1, characterized in that, The air supply system also has: In the second air supply mode, the outdoor air duct (30) is connected to the second air inlet (102) and closed to the second air outlet (104). The indoor air inlet air duct (40) and the indoor air outlet air duct (50) are both open. At this time, the outdoor airflow and the indoor airflow enter the double-suction centrifugal fan (20) through the second air inlet (102) and the first air inlet (101) respectively, mix, and then be sent into the room from the first air outlet (103) through the indoor air outlet air duct (50).

3. The air supply system according to claim 2, characterized in that, The outdoor air duct (30) has an outdoor connection end that communicates with the outdoor environment, an outdoor air inlet end that communicates with the second air inlet (102), and an outdoor air outlet end that communicates with the second air outlet (104). Both the outdoor air inlet end and the outdoor air outlet end can be controlled to be switched on or off. The indoor air intake duct (40) has an indoor air intake end that communicates with the indoor environment and an indoor air intake connection end that communicates with the first air intake (101). At least one of the indoor air intake end and the indoor air intake connection end can be controlled to be switched on or off. The indoor air outlet duct (50) has an indoor air outlet end that communicates with the indoor environment and an indoor air outlet connection end that communicates with the first air outlet (103). At least one of the indoor air outlet end and the indoor air outlet connection end can be controlled to be switched on or off. In the air supply mode, the outdoor air inlet is open, the outdoor air outlet is closed, the indoor air inlet (40) is closed, and the indoor air outlet (50) is open. In the second air supply mode, the outdoor air inlet is open, the outdoor air outlet is closed, the indoor air inlet duct (40) is open, and the indoor air outlet duct (50) is open. In the third air supply mode, the outdoor air inlet is turned off, the outdoor air outlet is turned on, the indoor air inlet path (40) is turned on, and the indoor air outlet path (50) is turned off.

4. The air supply system according to claim 3, characterized in that, The outdoor connection end and the outdoor air inlet end correspond to each other in the axial direction of the double-suction centrifugal fan (20); The indoor air inlet end and the indoor air inlet connection end correspond to each other in the radial direction of the double-suction centrifugal fan (20); The indoor air outlet and the indoor air outlet connection point correspond to each other in the axial direction of the double-suction centrifugal fan (20).

5. The air supply system according to claim 3, characterized in that, The outdoor air inlet, outdoor air outlet and indoor air outlet connection are provided with damper structures (60), and the opening and closing of the corresponding ports are controlled by the damper structures (60); The indoor air inlet and the indoor air outlet are provided with a grille structure (70), and the opening and closing of the corresponding ports are controlled by the grille structure (70).

6. The air supply system according to any one of claims 1-5, characterized in that, The air supply system also includes: Fresh air duct (80), one end of which is connected to the outdoor connection end and the other end is connected to the outdoor environment.

7. An air conditioner, characterized in that, The air supply system includes any one of claims 1-6.

8. The air conditioner according to claim 7, characterized in that, The air conditioner includes: An air quality sensor (90) is used at least to acquire indoor air quality parameters when the air conditioner is executing the air supply mode three; The controller (100) is communicatively connected to the air quality sensor (90) and is used to control whether the air conditioner continues to execute the air supply mode three according to the indoor air quality parameters; The indoor air quality parameters mentioned therein include at least the combustible gas concentration parameter.

9. The air conditioner according to claim 8, characterized in that, The air conditioner also includes: Outdoor temperature sensor, used to obtain outdoor temperature values; Indoor temperature sensor, used to obtain indoor temperature values; The air conditioner has a fresh air intake program, wherein when the air conditioner starts the fresh air intake program, the controller (100) controls the air conditioner to execute either air supply mode one or air supply mode two according to the temperature difference between indoors and outdoors.

10. The air conditioner according to claim 8, characterized in that, The air conditioner is a cabinet air conditioner, the air supply system is located in the bottom area of ​​the cabinet air conditioner, and the air quality sensor (90) is located in the bottom area of ​​the cabinet air conditioner.

11. A method for controlling the air supply of an air conditioner, characterized in that, The air supply control method, applied to any one of claims 7-10, comprises: In response to the start command of the air conditioner, the air conditioner is controlled to supply air in the air supply mode three.

12. The air supply control method according to claim 11, characterized in that, The air supply control method further includes: When the air conditioner supplies air in the air supply mode three, it is determined whether the indoor air quality parameters meet the requirements. The indoor air quality parameters include at least the combustible gas concentration parameter. If the conditions are met, the air conditioner is controlled to exit the third air supply mode; Conversely, the air conditioner is controlled to continue supplying air in the air supply mode three.

13. The air supply control method according to claim 12, characterized in that, The air supply control method further includes: In response to the start command of the fresh air intake program of the air conditioner, it is determined whether the absolute value of the temperature difference between indoors and outdoors is greater than or equal to the preset temperature difference value; If so, after the air supply mode three operation ends and exits, control the air conditioner to execute the air supply mode two; Conversely, after the third air supply mode ends and exits, the air conditioner is controlled to execute the first air supply mode.

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