Air conditioner indoor unit

Abstract

The application discloses an air conditioner indoor unit, and belongs to the technical field of household appliances. The air conditioner indoor unit comprises a casing, a heat exchanger, a fan and an air duct piece. The casing is provided with a casing air inlet and a casing air outlet. The heat exchanger is arranged in the casing, and the fan and the air duct piece are arranged in the casing. The air duct piece comprises a containing part, an air duct part and a main body part. The containing part is used for containing the fan, and is provided with an air inlet part for air to enter the containing part. The air duct part is defined to form a first air duct, which is communicated with the containing part. The main body part is defined to form a second air duct, which is communicated with the first air duct. An air inlet end of the second air duct is arranged towards the casing air inlet, and an air outlet end of the second air duct is arranged towards a windward side of the heat exchanger. The inner diameter of the second air duct decreases first and then increases along the flow direction of the airflow, so that when the airflow flows through the second air duct, a negative pressure is formed in the second air duct, thereby enabling the air outside the casing to flow into the second air duct from the casing air inlet.

Description

Technical Field

[0001] This application belongs to the technical field of home appliances, and in particular relates to air conditioner indoor units. Background Technology

[0002] As the core component of an air conditioning system that exchanges heat with the indoor environment, the air duct structure design of the indoor unit directly affects its airflow performance, thus determining the indoor temperature regulation efficiency, airflow distribution uniformity, and user comfort. Traditional air conditioning indoor units mainly rely on centrifugal fans or cross-flow fans to drive airflow, and use air deflectors to adjust the airflow direction. However, under the same fan power and speed conditions, the aerodynamic efficiency of traditional ducts is relatively low. Airflow is prone to energy losses such as eddies and separation during transport, which not only reduces the airflow volume of the indoor unit but also reduces its cooling or heating efficiency. Furthermore, the contact between the airflow and the heat exchanger in traditional ducts is uneven, and the surface of the heat exchanger cannot fully exchange heat with the airflow, reducing the heat exchanger's efficiency and thus lowering the cooling or heating efficiency of the indoor unit. Utility Model Content

[0003] To address the shortcomings of related technologies, this application provides an air conditioning indoor unit that optimizes the air duct design based on fluid dynamics principles and the Venturi effect to achieve multi-stage airflow mixing, thereby increasing the air intake volume of the air conditioning indoor unit and improving the air output effect.

[0004] This application provides an indoor unit for an air conditioner, comprising:

[0005] The casing has an air inlet and an air outlet.

[0006] The heat exchanger is located inside the casing, with its leeward side facing the air outlet of the casing.

[0007] A fan, located inside the casing, is used to guide airflow to the heat exchanger;

[0008] Air duct components, which are located inside the housing, include:

[0009] The housing section is used to house the fan, and the housing section is equipped with an air inlet for air to enter the housing section;

[0010] The air duct section is defined by a first air duct, which is connected to the receiving section.

[0011] The main body is defined by a second air duct that is connected to the first air duct. The air inlet of the second air duct faces the air inlet of the casing, and the air outlet of the second air duct faces the windward side of the heat exchanger. The inner diameter of the second air duct decreases and then increases along the direction of airflow, so that when the airflow passes through the second air duct, a negative pressure is formed inside the second air duct, so that the air outside the casing flows into the second air duct from the air inlet of the casing.

[0012] In this technical solution, an air duct component is installed inside the casing. The inner diameter of the second air duct component first decreases and then increases along the airflow direction, forming a structure similar to a Venturi tube. When the fan is running, air flows within the second air duct. Due to the first contraction and then expansion of the inner diameter of the second air duct, according to the principles of fluid mechanics, the airflow velocity increases and the pressure decreases in the contraction section, while the velocity decreases and the pressure increases in the expansion section. This creates a negative pressure area within the second air duct, attracting outside air from the casing's air inlet into the second air duct, effectively increasing the air intake volume. Furthermore, the air duct component integrates the housing, the first air duct, and the second air duct, combining functions such as fan installation and airflow guidance. The compact structure facilitates the organization and management of airflow inside the indoor unit of the air conditioner and also contributes to the miniaturization design of the equipment.

[0013] In some embodiments, the air duct section is located at the air inlet end of the second air duct, and the air duct section has an annular structure so that air outside the casing passes through the air duct section and enters the second air duct.

[0014] In this technical solution, the air duct section adopts a ring structure and is located at the air inlet end of the second air duct to avoid the air duct section from blocking the second air duct. This allows the air outside the casing to pass smoothly through the air duct section into the second air duct, reducing airflow resistance and improving air intake efficiency. At the same time, the ring structure design helps to make the air distribution from the first air duct into the second air duct more uniform.

[0015] In some embodiments, the first air duct is arranged circumferentially along the air duct section, the air duct section is provided with an air outlet for connecting the first air duct and the second air duct, the air outlet is arranged circumferentially along the air duct section; the receiving section is located on the outer periphery of the air duct section.

[0016] In this technical solution, by setting the first air duct along the circumference of the air duct section and the air outlet section along the circumference of the air duct section, the airflow blown out by the fan can be evenly merged into the second air duct along the circumference of the air duct section, avoiding the impact and turbulence caused by the concentrated merging of airflow, reducing the energy loss of airflow in the air duct, and improving the efficiency of airflow transmission.

[0017] In some embodiments, the air outlet is located on the outer periphery of the air duct section and is disposed facing the inner wall of the main body section. The air outlet is used to guide the airflow to the inner wall of the main body section.

[0018] In this technical solution, by placing the air outlet on the outer periphery of the air duct and facing the inner wall of the main body, the airflow is guided to flow along the inner wall of the main body. By utilizing the constraint effect of the inner wall on the airflow, the separation and eddy phenomenon of the airflow in the air duct are effectively reduced.

[0019] In some embodiments, the inner wall of the main body is provided with a ventilation section located at the transition point where the inner diameter of the main body decreases to increase, and the ventilation section is used to allow air from outside the main body to enter the second air duct.

[0020] In this technical solution, according to fluid mechanics, the transition point where the inner diameter of the second air duct decreases to increase is the negative pressure peak area. By setting a ventilation section at this point, an additional entry channel is provided for the air outside the casing, which can actively draw in more air by utilizing the negative pressure in this area, thereby further increasing the air intake volume.

[0021] In some embodiments, the inner wall of the main body is provided with a turbulence portion, which is provided to protrude from or be recessed into the inner wall of the main body, and the turbulence portion is located at the air outlet end of the second air duct.

[0022] In this technical solution, a turbulence section is provided on the inner wall of the main body, which can disturb the airflow that is about to flow to the heat exchanger, making the airflow more turbulent, increasing the contact opportunity between the air and the surface of the heat exchanger and the intensity of turbulence, thereby improving the heat exchange efficiency and enhancing the cooling or heating effect of the air conditioner.

[0023] In some embodiments, a baffle is also included, which is located between the windward side of the heat exchanger and the air outlet of the second air duct. The baffle is arranged to cover the windward side of the heat exchanger and is used to turbulent the airflow flowing towards the heat exchanger.

[0024] In this technical solution, a baffle is installed between the windward side of the heat exchanger and the air outlet of the second air duct, and the baffle covers the windward side of the heat exchanger. This allows the baffle to further turbulent the airflow entering the heat exchanger, making the airflow distribution more uniform, avoiding localized poor heat exchange, and improving the overall heat exchange performance of the heat exchanger.

[0025] In some embodiments, the housing is connected to an air guide plate, which is used to guide the airflow from the housing outlet; two air guide plates are provided, which are located on the outer edges of opposite sides of the housing outlet.

[0026] In this technical solution, two air guide plates are set at the outer edges of the air outlet on both sides of the casing. The air flow direction of the air outlet is guided by the cooperation of the two air guide plates. The air guide angle can be adjusted according to actual needs, thereby achieving effective control of the indoor air supply range and direction, and improving the comfort of air conditioning use.

[0027] In addition, this application also provides an air conditioner indoor unit, comprising:

[0028] The casing has an air inlet and an air outlet.

[0029] The heat exchanger is located inside the casing, with its leeward side facing the air outlet of the casing.

[0030] A fan, located inside the casing, is used to guide airflow to the heat exchanger;

[0031] A duct component, located inside the casing; the duct component houses the fan and guides airflow to the heat exchanger; one end of the duct component faces the air inlet of the casing, and the other end faces the windward side of the heat exchanger; the duct component includes:

[0032] The first guide section is located at the end of the air duct component facing the air inlet of the casing, and the inner diameter of the first guide section decreases along the air duct component towards the heat exchanger.

[0033] The second guide section is located on the side of the first guide section facing the heat exchanger. The inner diameter of the second guide section decreases and then increases along the air duct towards the heat exchanger.

[0034] By operating the fan, air is introduced into the air duct component and flows sequentially through the first guide section and the second guide section before flowing into the heat exchanger. When the air flows through the first guide section and the second guide section, a negative pressure is formed inside the air duct component, causing the air outside the casing to flow into the air duct component from the air inlet of the casing and finally flow into the heat exchanger.

[0035] In this technical solution, when the fan is running, air first enters the first guide section. Due to its gradually narrowing inner diameter, the airflow is accelerated here, increasing velocity and decreasing pressure. It then enters the second guide section, where the inner diameter first decreases and then increases, further accelerating and diffusing the airflow. The combined design of the first and second guide sections creates a continuous negative pressure effect within the ductwork, more effectively drawing in external air from the inlet and guiding it to the heat exchanger. This reduces energy loss, improves air delivery efficiency, and ensures the stability and efficiency of the air intake for the indoor unit, laying the foundation for excellent heat exchange performance.

[0036] In some embodiments, the ductwork further includes a turbulence section located at one end of the ductwork facing the heat exchanger, and the turbulence section is located at the end of the second guide section away from the first guide section; the inner diameter of the turbulence section increases along the ductwork toward the heat exchanger.

[0037] In this technical solution, the turbulence section adjusts the speed and direction of the airflow passing through the second guide section. By gradually increasing the inner diameter of the turbulence section, the airflow can gradually diffuse as it flows out, reducing the airflow velocity and making the airflow flow more evenly to the heat exchanger. This avoids the problem of uneven heat exchange caused by uneven airflow velocity and improves the heat exchange uniformity.

[0038] In the above embodiments, the indoor unit of the air conditioner has a duct component installed inside the casing. The inner diameter of the second duct first decreases and then increases to form a structure similar to a Venturi tube. When the fan is running, the air flows through the duct. The flow velocity increases and the pressure decreases in the contraction section, and the flow velocity decreases and the pressure rises in the expansion section. This creates a negative pressure area in the duct, which actively attracts air from outside the casing to flow in from the air inlet of the casing, thereby increasing the air intake. The duct component integrates the housing, the first duct and the second duct, and integrates functions such as fan installation and airflow guidance. The structure is compact, which facilitates the organization and management of airflow inside the indoor unit of the air conditioner and is also conducive to the miniaturization design of the equipment. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of an embodiment of the indoor unit of the air conditioner in this application;

[0040] Figure 2 This is a structural schematic diagram of another embodiment of the indoor unit of the air conditioner in this application from another angle;

[0041] Figure 3 This is a schematic diagram of the structure of an embodiment of the air conditioner indoor unit of this application when the air outlet grille is not installed;

[0042] Figure 4 This is a cross-sectional view of one embodiment of the indoor unit of the air conditioner in this application;

[0043] Figure 5 yes Figure 4 Enlarged view of the structure at point A in the middle;

[0044] Figure 6 This is a schematic diagram of the air duct component in one embodiment of the air conditioner indoor unit of this application;

[0045] Figure 7 yes Figure 6 Enlarged view of the structure at point B in the middle;

[0046] Figure 8 This is a cross-sectional view of the air duct component in one embodiment of the indoor unit of the air conditioner in this application;

[0047] Figure 9 This is a cross-sectional view of the air duct component from another angle in one embodiment of the indoor unit of the air conditioner in this application;

[0048] Figure 10 This is a schematic diagram of airflow in one embodiment of the indoor unit of the air conditioner in this application.

[0049] In the picture,

[0050] 100. Casing; 200. Air guide plate; 300. Heat exchanger; 400. Air duct components; 500. Baffle plate;

[0051] 110. Air intake grille;

[0052] 410. Reception section; 420. Air duct section; 430. Main body section;

[0053] 421. First air duct; 422. Air outlet section;

[0054] 431. Ventilation section; 432. Turbulence section; 433. First guide section; 434. Second guide section; 435. Turbulence section. Detailed Implementation

[0055] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0056] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0057] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0058] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0059] The air conditioning indoor unit provided in this application can have various implementation forms. For example, it can be a vertical air conditioning indoor unit, an air conditioning indoor unit, an air conditioning indoor unit with fresh air function, or an air conditioning indoor unit without fresh air function, etc. Figures 1-3 This is one specific implementation of the indoor unit of the air conditioner in this application.

[0060] like Figures 1-3 As shown, the housing 100 is used to form the overall appearance of the indoor unit of the air conditioner. In practical applications, the housing 100 is usually set at the top of the room or in the upper space of the room. The rear side of the housing 100 faces the wall, and the front side of the housing 100 faces the user.

[0061] An air inlet is formed on the housing 100, and air from outside the housing 100 enters the housing 100 through the air inlet.

[0062] In some embodiments, the air inlet of the housing is located on the rear side of the housing 100. Since the front of the housing 100 is usually the user's activity area, placing the air inlet on the rear side of the housing 100 can reduce the intake of dust, hair and other debris from the front activity area. Moreover, since components such as the fan and heat exchanger 300 are usually located on the rear side of the housing 100, placing the air inlet on the rear side of the housing 100 can also shorten the air intake path, reduce airflow friction noise, and the noise source is blocked by the housing 100 and the wall, further reducing interference to the user.

[0063] like Figure 2 As shown, an air inlet grille 110 is provided at the air inlet of the housing. The air inlet grille 110 is detachably installed on the housing 100 and is used to prevent dust, debris and other objects from entering the interior of the housing 100.

[0064] An air outlet is formed on the housing 100, and the air inside the housing 100 flows to the outside of the housing 100 through the air outlet.

[0065] In some embodiments, the air outlet of the housing is located on the front side of the housing 100 so that the airflow can be blown directly to the activity area, shortening the transmission distance and reducing energy loss. Furthermore, the unobstructed layout of the front side of the housing 100 ensures smooth airflow diffusion and avoids airflow attenuation due to obstruction from the side or rear.

[0066] like Figure 1 As shown, the indoor unit of the air conditioner includes an air guide plate 200, which is located at the air outlet of the unit casing to guide the airflow out of the air outlet. There are two air guide plates 200, which are located on the outer edges of opposite sides of the air outlet of the unit casing. By cooperating with each other, the airflow direction of the air outlet of the unit casing is guided, and the air guide angle can be adjusted according to actual needs, thereby achieving effective control of the indoor air supply range and direction, and improving the comfort of using the air conditioner.

[0067] It should be noted that the air guide plate 200 is rotatably connected to the housing 100. The rotation method of the air guide plate 200 is a conventional technical means in this field and will not be described in detail here.

[0068] like Figure 1 As shown, the indoor unit of the air conditioner includes a heat exchanger 300, which is located inside the casing 100 and is used to exchange heat with the air passing through it to form air conditioning air to meet the user's cooling or heating needs. The leeward side of the heat exchanger 300 faces the air outlet of the casing.

[0069] It should be noted that air conditioning can produce cold air, hot air, or even air at room temperature.

[0070] The indoor unit of the air conditioner includes a fan (not shown in the figure), which is used to guide the airflow to the heat exchanger 300. By operating the fan, the air outside the casing 100 enters the casing 100, passes through the heat exchanger 300 for heat exchange, and then flows back into the room to cool or heat the indoor environment.

[0071] In some embodiments, the fan is a multi-blade centrifugal fan. Compared to ordinary fans, multi-blade centrifugal fans can reduce air resistance, have less airflow pulsation and turbulence noise, and are also characterized by long service life and wear resistance.

[0072] like Figure 3 As shown, the indoor unit of the air conditioner includes a duct component 400, which is located inside the casing 100. The duct component 400 is used to install a fan and form a duct to guide airflow, so that the air can flow better to the heat exchanger 300.

[0073] like Figure 4 , Figure 6 , Figure 8 and Figure 9 As shown, the air duct component 400 includes a receiving portion 410, the interior of which is used to house a fan; the receiving portion 410 is provided with an air inlet, through which air from outside the air duct component 400 enters the receiving portion 410. By operating the fan, air from outside the casing 100 flows into the receiving portion 410 from the air inlet.

[0074] It should be noted that the air inlet can be connected to the air inlet of the housing, so that the air outside the housing 100 passes through the air inlet and the air inlet in sequence before entering the receiving part 410. Alternatively, an additional air vent can be opened on the housing 100, so that the air inlet is connected to the air vent, so that the air outside the housing 100 passes through the air vent and the air inlet in sequence before entering the receiving part 410. This is a conventional technical means in the art and will not be described in detail.

[0075] like Figure 4 , Figure 6 , Figure 8 and Figure 9 As shown, the air duct component 400 includes an air duct section 420, which defines a first air duct 421. The first air duct 421 communicates with the interior of the receiving section 410. By operating a fan, air in the receiving section 410 enters the first air duct 421.

[0076] By placing the fan in a relatively enclosed housing 410 and connecting the air duct 420 to the housing 410, the airflow generated by the fan can be transported by the first air duct 421, which can prevent airflow leakage and ensure the fan's air delivery effect.

[0077] like Figure 7As shown, the air duct section 420 is provided with an air outlet section 422, which is connected to the first air duct 421 so that the air in the first air duct 421 flows out of the first air duct 421 through the air outlet section 422.

[0078] In some embodiments, the receiving portion 410 is located below the air duct portion 420.

[0079] like Figure 4 , Figure 6 , Figure 8 and Figure 9 As shown, the air duct component 400 includes a main body 430, within which a second air duct is defined. The second air duct is connected to the first air duct 421 via an air outlet 422. The air outlet of the second air duct is positioned facing the windward side of the heat exchanger 300 so that the second air duct guides the airflow toward the heat exchanger 300.

[0080] As the fan operates, air enters the housing 410 from the air inlet and comes into contact with the fan. Then, it flows through the first air duct 421 and out of the air outlet 422 to the second air duct and then to the heat exchanger 300.

[0081] In this application, based on the principles of fluid dynamics, a multi-level composite air duct system is constructed through the synergistic application of the Bernoulli effect, Venturi effect, and Coanda effect to achieve multi-level airflow mixing, thereby increasing the air intake volume of the indoor unit of the air conditioner and enabling step-by-step control of airflow parameters.

[0082] The inner diameter of the main body 430 decreases and then increases along the flow path of the airflow in the second air duct, so that the second air duct forms a structure similar to a Venturi tube, so that the air outside the second air duct can enter the second air duct under the negative pressure of the second air duct, thereby increasing the air volume of the second air duct.

[0083] Specifically, such as Figure 9 As shown, the second air duct includes a first guide section 433. The first guide section 433 is located at one end of the main body 430 connected to the air duct section 420. The first guide section 433 is set near the air inlet end of the second air duct. When air enters the second air duct, it first passes through the first guide section 433.

[0084] The inner diameter of the first guide section 433 decreases along the second air duct towards the heat exchanger 300, so that the first guide section 433 forms a Bernoulli effect. When the airflow passes through the first guide section 433, a negative pressure zone is formed inside the first guide section 433, thereby attracting air from outside the second air duct into the second air duct, thereby increasing the air intake of the second air duct.

[0085] In this application, in order to allow air outside the casing 100 to enter the second air duct under negative pressure, the air inlet of the second air duct is positioned close to the air outlet of the casing, so that air outside the casing 100 flows into the second air duct from the air inlet of the casing under negative pressure.

[0086] For ease of description, in this embodiment, the air that enters the receiving part 410 from the air inlet and passes through the first air duct 421 into the second air duct is referred to as the first air; the air that enters the second air duct from the air inlet of the casing under the negative pressure of the second air duct is referred to as the second air.

[0087] As the fan operates, the first air enters the housing 410 from the air inlet and then enters the first air duct 421 from the housing 410. It then flows from the first air duct 421 through the air outlet 422 into the second air duct. Under the negative pressure of the second air duct, the second air enters the second air duct from the air inlet of the casing. The second air mixes with the first air in the second air duct and flows along the second air duct toward the heat exchanger 300.

[0088] It should be noted that when the second air enters the second air duct under negative pressure, it can increase the air volume, reduce the air pressure, and reduce the air velocity in the first guide section 433.

[0089] In some embodiments, the first guide section 433 is streamlined and tapered to reduce the air resistance of the inner wall of the main body 430, so that the airflow converges towards the center of the second air duct when passing through the first guide section 433, thereby reducing the air pressure and increasing the air volume, forming the Bernoulli effect.

[0090] like Figure 9 As shown, the second air duct includes a second guide section 434, which is located on the side of the first guide section 433 away from the air inlet of the casing. Compared with the first guide section 433, the second guide section 434 is set closer to the heat exchanger 300. The second guide section 434 and the first guide section 433 are distributed along the flow direction of the airflow in the second air duct. The connection between the second guide section 434 and the first guide section 433 is smoothly transitioned to reduce the resistance to the airflow.

[0091] The inner diameter of the second guide section 434 decreases and then increases along the second air duct toward the heat exchanger 300, so that the second guide section 434 forms a Venturi effect, causing the airflow velocity to increase and then decrease when passing through the second guide section 434, and the static pressure of the airflow to decrease and then increase.

[0092] The first half of the second guide section 434 is connected to the first guide section 433. The first half of the second guide section 434 is a contraction section, which causes the second air duct to contract towards the center. The airflow will be accelerated and pressurized due to the reduction of the inner diameter of the second air duct. When the second guide section 434 contracts to the convex part, it expands outward in a direction away from the first guide section 433, which increases the inner diameter of the second air duct. Some airflow follows the principle of Newton's inertia to break away from the inner wall of the second guide section 434 and converges towards the center of the second air duct. Some airflow follows the Coanda effect and flows along the inner wall of the main body 430.

[0093] In some embodiments, the second guide segment 434 is streamlined and protrudes towards the center, so that the inner diameter of the second guide segment 434 first decreases and then increases.

[0094] It should be noted that the inner diameter of the main body 430 can also be considered as the inner diameter of the second air duct. At the protrusion of the second guide section 434, the inner diameter of the main body 430 is the smallest, that is, the inner diameter of the second air duct is the smallest. Therefore, the airflow velocity is the highest when the airflow passes through the protrusion of the second guide section 434.

[0095] like Figure 5 As shown, the inner wall of the main body 430 is provided with a ventilation section 431. The ventilation section 431 is located at the protrusion of the second guide section 434. The ventilation section 431 is used to connect the inner and outer sides of the main body 430 so that the air outside the second air duct enters the second air duct through the ventilation section 431. When the airflow passes through the second guide section 434, the air outside the second air duct enters the second air duct through the ventilation section 431.

[0096] In some embodiments, the ventilation section 431 is a through hole provided on the inner wall of the main body 430. The opening direction of the through hole is set approximately along the flow direction of the airflow in the second air duct, so as to avoid the airflow outside the second air duct from entering the second air duct through the ventilation section 431 and thus reducing the flow rate of the airflow in the second air duct.

[0097] Since the ventilation section 431 is located at the protrusion of the second guide section 434, and the airflow velocity is the greatest and the static pressure is the lowest when the airflow passes through the protrusion, the air outside the second air duct enters the second air duct through the ventilation section 431 and mixes with the air inside the second air duct, thereby increasing the airflow volume and decreasing the air pressure in the second guide section 434.

[0098] It should be noted that the portion of the airflow within the second guide section 434 that is not blown toward the central region follows the Coanda effect, and the airflow flows along the inner wall of the second guide section 434.

[0099] For ease of description, the air entering the second air duct from the ventilation section 431 will be referred to as the third air.

[0100] It should be noted that the airflow velocity in the second duct first increases and then decreases, and the pressure first decreases and then increases. This not only increases the negative pressure effect of the second duct, allowing more second and third air to enter the second duct, but also reduces the energy loss of the airflow.

[0101] like Figure 9 As shown, the second air duct includes a turbulence section 435, which is located at the end of the second guide section 434 away from the first guide section 433. The turbulence section 435 is located at the air outlet end of the second air duct. The inner diameter of the turbulence section 435 increases along the second air duct toward the heat exchanger 300 to guide the airflow to the outside of the second air duct and make the airflow flow toward the heat exchanger 300.

[0102] It should be noted that the inner wall of the main body 430 is provided with a turbulence section 432. The turbulence section 432 is provided to protrude from or be recessed into the inner wall of the main body 430. The turbulence section 432 is located near the end of the main body 430 facing the heat exchanger 300. The turbulence section 432 is located in the turbulence section 435 so that the turbulence section 432 can disturb the airflow that is about to flow to the heat exchanger 300, making the airflow more turbulent and allowing the airflow to mix evenly. This increases the contact opportunity between the air and the surface of the heat exchanger 300 and the turbulence intensity, thereby improving the heat exchange efficiency and enhancing the cooling or heating effect of the air conditioner.

[0103] In some embodiments, one end of the main body 430 is disposed toward the heat exchanger 300, and the other end of the main body 430 is disposed toward the air outlet of the casing. The interior of the main body 430 defines a cavity that extends along the disposed direction of the main body 430 to form a second air duct inside the main body 430.

[0104] In some embodiments, the material of the air duct component 400 can be replaced with high-strength sheet metal or other loose and porous materials that can absorb sound, as needed. Sound insulation panels are attached to the outer surface of the air duct component 400 for sound insulation and noise reduction.

[0105] like Figure 4 As shown, the air duct section 420 is located at the end of the main body section 430 facing the air inlet of the housing, that is, the air duct section 420 is located at the air inlet end of the second air duct. In order to prevent the air duct section 420 from obstructing the second air duct, the air duct section 420 is designed as a ring structure extending along a closed curve, so that the middle part of the air duct section 420 is an opening, allowing air outside the housing 100 to pass through the opening in the middle part of the air duct section 420 and enter the second air duct, reducing airflow resistance and improving the air intake efficiency of the second air. Furthermore, designing the air duct section 420 as a ring structure also helps to make the air distribution from the first air duct 421 into the second air duct more uniform.

[0106] It should be noted that the air duct section 420 may be a circular ring structure, or a square ring structure, or an irregularly shaped ring structure, etc.

[0107] The first air duct 421 is arranged around the circumference of the air duct section 420, the air outlet 422 is arranged around the circumference of the air duct section 420 and along the circumference of the air duct section 420, and the receiving section 410 is located on the outer periphery of the air duct section 420. This layout allows the air drawn in by the fan to pass evenly through the first air duct 421 into the second air duct, enhancing the stability and uniformity of the airflow, thereby improving the overall heat exchange efficiency of the heat exchanger 300.

[0108] The air duct section 420 has an air outlet section 422 on one side connected to the main body section 430. The air outlet section 422 is used to guide the airflow to the inner wall of the main body section 430 so that the inner wall of the main body section 430 acts on the air, thereby forming a more reasonable flow path for the air in the second air duct, reducing the generation of eddies, improving the smoothness of airflow, and thus improving the performance of the entire air conditioning indoor unit.

[0109] In some embodiments, the air outlet 422 is an annular opening provided in the air duct 420, and the annular opening is disposed facing the inner wall of the main body 430.

[0110] like Figure 3 As shown, the indoor unit of the air conditioner includes a baffle 500, which is located on the windward side of the heat exchanger 300 and between it and the air outlet of the second air duct. The baffle 500 covers the windward side of the heat exchanger 300 so that it can further turbulent the airflow entering the heat exchanger 300, making the airflow distribution more uniform, avoiding local heat exchange problems, and improving the overall heat exchange performance of the heat exchanger 300.

[0111] The baffle 500 is provided with several through holes for airflow to pass through. When the airflow passes through the baffle 500, the airflow is dispersed, which reduces the airflow speed and noise. At the same time, it allows the airflow to fully contact the windward side of the heat exchanger 300, ensuring that the airflow is evenly distributed on the windward side of the heat exchanger 300.

[0112] In some embodiments of this application, two fans are provided, which are set independently to increase the air intake of the indoor unit of the air conditioner; correspondingly, two duct components 400 are provided, which are set independently to each other, and the two duct components 400 are set one-to-one with the two fans.

[0113] like Figure 10As shown, the working principle of the air duct component 400 in the above-mentioned air conditioner indoor unit is as follows: When the fan is running, the first air enters the receiving part 410 from the air inlet and comes into contact with the fan, and then enters the first air duct 421 from the receiving part 410. Then it enters the second air duct through the air outlet 422. The first air flows through the first guide section 433 along the second air duct. When the first air flows through the first guide section 433, a negative pressure is generated in the second air duct. Under the action of the negative pressure, the second air enters the second air duct from the air inlet of the casing 100. The second air mixes with the first air in the first guide section 433. The second air and / or the second air continue to flow along the second air duct. When the first air and / or the second air flows through the second guide section 434, the third air enters the second air duct from the ventilation part 431. The third air and / or the first air and / or the second air mix to form a mixed gas. The mixed gas continues to flow along the second air duct. After flowing through the turbulence section 435, it flows out of the second air duct and flows to the heat exchanger 300.

[0114] The above-mentioned indoor air conditioner has a simple overall structure, with rotating moving parts, and is small and lightweight. Even when placed in a low space, there is no need to worry about harming children or pets. It can also be used as a portable air conditioner for rapid cooling and heating of spaces that require localized cooling and heating. It can also be used in targeted cooling scenarios such as data centers that require large air volume and wide air field.

[0115] Through the description of several embodiments of the air conditioner indoor unit of this application, it can be seen that the embodiments of the air conditioner indoor unit of this application have at least one or more of the following advantages:

[0116] 1. By placing the fan inside the housing 410, not only can the airflow generated by the fan be prevented from leaking, but also children or pets can be prevented from coming into contact with the fan, thus eliminating safety hazards.

[0117] 2. By gradually reducing the inner diameter of the first guide section 433 along the airflow direction, a Bernoulli effect is formed in the first guide section 433, allowing air outside the casing 100 to enter the second air duct through the casing air inlet, thereby increasing the air intake of the second air duct.

[0118] 3. By first reducing and then increasing the inner diameter of the second guide section 434 along the airflow direction, a Venturi effect is formed in the second guide section 434, and a ventilation section 431 is provided at the protrusion of the second guide section 434 so that air outside the second air duct can enter the second air duct through the ventilation section 431, thereby further increasing the air intake of the second air duct.

[0119] 4. By setting a turbulence section 435 at the air outlet of the second air duct, the airflow flowing out of the second air duct is turbulent, so that the airflow can be mixed more evenly and the airflow velocity is reduced, so that the airflow can fully contact the heat exchanger 300.

[0120] 5. By setting the second air duct in the main body 430 and the first air duct 421 in the air duct section 420, the main body 430 and the air duct section 420 can be detachably connected to achieve the connection between the second air duct and the first air duct 421. This not only facilitates cleaning and maintenance and reduces the problem of heat exchanger 300 efficiency reduction caused by dust accumulation, but also has a simple overall structure without complex mechanical structure, fewer failure points, and low maintenance cost.

[0121] 6. Highly flexible and adaptable, it can meet the needs of diverse scenarios.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0123] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific application considerations.

Claims

1. An indoor unit for an air conditioner, characterized in that, include: The casing has an air inlet and an air outlet. A heat exchanger is disposed inside the housing, with the leeward side of the heat exchanger facing the air outlet of the housing; A fan, which is located inside the casing, is used to guide airflow to the heat exchanger; An air duct component, disposed within the housing, the air duct component comprising: A housing for accommodating the fan, the housing having an air inlet for air to enter the housing; The air duct section is defined by forming a first air duct, which is connected to the receiving section; The main body is defined by a second air duct that communicates with the first air duct. The air inlet of the second air duct faces the air inlet of the casing, and the air outlet of the second air duct faces the windward side of the heat exchanger. The inner diameter of the second air duct decreases and then increases along the direction of airflow, so that when the airflow passes through the second air duct, a negative pressure is formed inside the second air duct, thereby allowing air from outside the casing to flow into the second air duct from the air inlet of the casing.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The air duct section is located at the air inlet end of the second air duct. The air duct section has an annular structure so that air from outside the casing passes through the air duct section and enters the second air duct.

3. The indoor unit of the air conditioner according to claim 1, characterized in that, The first air duct is arranged circumferentially along the air duct section, and the air duct section is provided with an air outlet for connecting the first air duct and the second air duct, the air outlet being arranged circumferentially along the air duct section; the receiving section is located on the outer periphery of the air duct section.

4. The indoor unit of the air conditioner according to claim 3, characterized in that, The air outlet is located on the outer periphery of the air duct and faces the inner wall of the main body. The air outlet is used to guide airflow toward the inner wall of the main body.

5. The indoor unit of the air conditioner according to claim 1, characterized in that, The inner wall of the main body is provided with a ventilation section, which is located at the transition point where the inner diameter of the main body decreases to increase. The ventilation section is used to allow air from outside the main body to enter the second air duct.

6. The indoor unit of the air conditioner according to claim 1, characterized in that, The inner wall of the main body is provided with a turbulence part, which is protruding from or recessed into the inner wall of the main body and is located at the air outlet end of the second air duct.

7. The indoor unit of the air conditioner according to claim 1, characterized in that, It also includes a baffle plate, which is located between the windward side of the heat exchanger and the air outlet of the second air duct. The baffle plate is arranged to cover the windward side of the heat exchanger and is used to turbulent the airflow flowing towards the heat exchanger.

8. The indoor unit of the air conditioner according to claim 1, characterized in that, The housing is connected to an air guide plate, which is used to guide the airflow from the air outlet of the housing; there are two air guide plates, which are located on the outer edges of opposite sides of the air outlet of the housing.

9. An indoor unit for an air conditioner, characterized in that, include: The housing is provided with a housing air inlet and a housing air outlet; A heat exchanger is disposed inside the housing, with the leeward side of the heat exchanger facing the air outlet of the housing; A fan, which is located inside the casing, is used to guide airflow to the heat exchanger; A duct component is disposed within the housing; the duct component is used to house the fan and guide airflow to the heat exchanger. One end of the air duct component faces the air inlet of the casing, and the other end faces the windward side of the heat exchanger; the air duct component includes: The first guide section is located at the end of the air duct component facing the air inlet of the housing, and the inner diameter of the first guide section decreases along the air duct component towards the heat exchanger. The second guide section is located on the side of the first guide section facing the heat exchanger, and the inner diameter of the second guide section first decreases and then increases along the air duct component toward the heat exchanger; By operating the fan, air is introduced into the air duct component and flows sequentially through the first guide section and the second guide section before flowing into the heat exchanger. When the air flows through the first guide section and the second guide section, a negative pressure is formed inside the air duct component, causing air from outside the casing to flow into the air duct component through the air inlet of the casing and finally flow into the heat exchanger.

10. The indoor unit of the air conditioner according to claim 9, characterized in that, The air duct component further includes a turbulence section located at one end of the air duct component facing the heat exchanger. The turbulence section is located at the end of the second guide section away from the first guide section. The inner diameter of the turbulence section increases along the air duct component towards the heat exchanger.

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