Indoor unit and heating, ventilation, and air conditioning system

Abstract

The present application discloses an indoor unit and a heating, ventilation, and air conditioning system. The indoor unit comprises a housing, a heat exchanger and a blower wheel; an air outlet and an air inlet are formed at an interval on the bottom surface; an air duct communicated with the air inlet and the air outlet is formed in the housing; the heat exchanger and the blower wheel are arranged at an interval in the air duct in an air flow direction; and the heat exchanger is located upstream of the blower wheel. The housing is further provided with an air supply channel; the air supply channel comprises an air supply inlet and an air supply outlet; the air duct comprises an air inlet portion located between the heat exchanger and the blower wheel and an air outlet portion located between the blower wheel and the air outlet; the air supply inlet is communicated with the air outlet portion; the air supply outlet is communicated with the air inlet portion.

Description

Indoor unit and HVAC system

[0001] Related applications

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on March 25, 2024, with application number 2024103452714 and invention name “Indoor unit and HVAC system”, the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application relates to the technical field of air conditioning, and in particular to an indoor unit and a heating and ventilation system. Background Art

[0004] As one of the commonly used air conditioning equipment, the HVAC system is used to adjust the indoor ambient temperature (some HVAC systems also have functions such as humidity regulation and purification).

[0005] In related technologies, in the air duct of the indoor unit of the HVAC system, the position of the impeller and the heat exchanger is relatively close, resulting in a larger flow resistance on the side of the impeller close to the heat exchanger, making the surge phenomenon in the indoor unit more serious. Surge is a vibration phenomenon caused by fluid dynamics instability, which usually produces noise and unstable air flow, thereby affecting the user experience. Summary of the Invention

[0006] The embodiments of the present application provide an indoor unit and a HVAC system, which can improve the gas flow near the side of the wind wheel close to the heat exchanger, reduce the turbulent kinetic energy there, and play a role in noise reduction.

[0007] In a first aspect, an embodiment of the present application provides an indoor unit, comprising:

[0008] A housing having an air outlet and an air inlet spaced apart on a bottom surface, and an air duct connecting the air inlet and the air outlet formed inside the housing; and

[0009] The heat exchanger and the wind wheel are arranged at intervals in the air duct along the air flow direction, and the heat exchanger is located upstream of the wind wheel;

[0010] In which, the shell also forms an air supply channel, the air supply channel includes an air supply inlet and an air supply outlet, the air duct includes an air inlet located between the heat exchanger and the wind wheel and an air outlet located between the wind wheel and the air outlet, the air supply inlet is connected to the air outlet, and the air supply outlet is connected to the air inlet.

[0011] In some embodiments, the extension line of the air outlet is tangent to the outer periphery of the wind wheel, and the angle between the extension line of the air outlet and the extension line of the air supply channel at the air supply inlet is θ, and θ is less than or equal to 105 degrees and greater than or equal to 85 degrees.

[0012] Based on the above embodiment, by controlling the angle between the extension line of the air inlet of the air supply channel and the extension line of the air outlet portion within a certain angle range, the gas flow rate entering the air supply channel from the air outlet portion can be guaranteed, while limiting the flow rate of the fluid entering the air supply channel, thereby avoiding the flow rate of the fluid at the air supply outlet being too high to affect the operation of the wind wheel.

[0013] In some embodiments, the air supply channel passes through the outer side of the wind wheel along the extension line of the air supply outlet.

[0014] Based on the above embodiment, the impact of the airflow from the air supply outlet of the air supply channel on the impeller is reduced, thereby reducing noise.

[0015] In some embodiments, the air supply channel is parallel to one of the peripheral tangents of the wind wheel at the direction extension line of the air supply outlet, and the distance between the air supply channel and the peripheral tangent is D, and D is less than or equal to 9 mm and greater than or equal to 3 mm.

[0016] Based on the above embodiment, the airflow at the air supply outlet of the air supply channel avoids directly impacting the wind wheel, and a certain airflow distance is maintained between the airflow at the air supply outlet of the air supply channel and the wind wheel, thereby reducing noise.

[0017] In some embodiments, the heat exchanger is tilted above the air inlet, a minimum distance space is formed between the heat exchanger and the wind wheel, and the air supply channel passes through the minimum distance space in the direction of the air supply outlet extension line.

[0018] Based on the above embodiment, the impact of the airflow at the air supply outlet of the air supply channel on the heat exchanger is reduced, thereby reducing noise.

[0019] In some embodiments, the width of the supplementary air channel is constant or gradually expands from the supplementary air inlet toward the supplementary air outlet.

[0020] Based on the above embodiments, the gas throughput and flow efficiency in the gas supplement channel are optimized.

[0021] In some embodiments, the width of the gas supplement channel is L, and L is less than or equal to 3 mm and greater than or equal to 1.5 mm.

[0022] Based on the above embodiment, by limiting the width range of the air supply channel, it is possible to prevent the gas flow rate entering the air supply channel from the air outlet from being too small, so as to be unable to effectively reduce the turbulent kinetic energy of the wind wheel close to the heat exchanger side, and at the same time prevent the gas entering the air supply channel from dispersing easily, so as to reduce the impact of the gas on the wind wheel.

[0023] In some embodiments, the central axis of the gas supplement channel is arranged in a curve.

[0024] Based on the above embodiments, the impact speed of the airflow in the air supply channel can be slowed down to further reduce the airflow noise and stabilize the airflow.

[0025] In some embodiments, the gas supplement channel includes a first sub-channel and a second sub-channel that are sequentially connected, and the curvature of the central axis of the first sub-channel is different from the curvature of the central axis of the second sub-channel.

[0026] Based on the above embodiment, by providing the first sub-channel and the second sub-channel with different curvatures, the fluid is further decelerated to reduce the aerodynamic impact on the wind wheel and improve the sound quality.

[0027] In some embodiments, the shell includes a casing, a panel, a cover and a water receiving tray assembly, the bottom of the casing is open, the panel cover is arranged at the opening, the air inlet and the air outlet are arranged at intervals on the panel, the cover and the water receiving tray assembly are arranged in the casing, and the cover is located above the water receiving tray assembly, the casing, the cover and the water receiving tray assembly cooperate to form the air duct, and the water receiving tray assembly is configured to carry condensed water from the heat exchanger; the water receiving tray assembly is provided with the air supply channel, the air supply inlet and the air supply outlet.

[0028] Based on the above embodiment, by arranging the air supply channel at the water receiving tray assembly, there is no need to arrange other components in the housing to arrange the air supply channel, so that the structure in the housing is more compact.

[0029] In some embodiments, the water receiving tray assembly includes a water receiving tray body and a volute tongue, the volute tongue is connected to the water receiving tray body, the volute tongue is located between the wind wheel and the water receiving tray body, and the volute tongue and the water receiving tray body cooperate to form the air supply channel, the air supply inlet and the air supply outlet.

[0030] Based on the above embodiment, the air supply channel is formed by the volute tongue and the water receiving tray body, so that the shape of the air supply channel can be controlled simultaneously when the shape of the volute tongue is set, thereby improving the convenience of setting the air supply channel.

[0031] In some embodiments, the volute tongue includes a first sub-component and a second sub-component connected to each other, the first sub-component is connected to the water receiving tray body, and the first sub-component and the water receiving tray body cooperate to form the air supply inlet; the second sub-component is detachably connected to the water receiving tray body, the side of the second sub-component facing away from the wind wheel is constructed as a first guide surface, and the surface of the water receiving tray body facing the second sub-component is constructed as a second guide surface, the second guide surface and the first guide surface cooperate to form the air supply channel, and the second sub-component and the water receiving tray body cooperate to form the air supply outlet.

[0032] Based on the above embodiment, the volute tongue is composed of a first sub-component and a second sub-component which are separately arranged. Compared with the method of forming the air supply channel in the hole-making process, it can save the cost of the hole-making process, and facilitate the cleaning of the air supply channel to reduce blockage.

[0033] In some embodiments, the first guide surface and / or the second guide surface is configured as an arc surface.

[0034] Based on the above embodiments, the flow rate of the airflow passing through the first guide surface or the second guide surface can be slowed down.

[0035] In some embodiments, the first sub-component and the second sub-component enclose and form a closed hollow cavity.

[0036] Based on the above embodiment, this can prevent the fluid in the air supplement channel from stagnating in the cavity between the first sub-component and the second sub-component.

[0037] In some embodiments, one of the first guide surface and the second guide surface is provided with at least one guide rib, and the other of the first guide surface and the second guide surface abuts against the at least one guide rib.

[0038] Based on the above embodiments, the stability of the gas supplement channel is maintained.

[0039] In some embodiments, the guide rib is protruded from the first guide surface and is integrally formed with the first guide surface, and the second guide surface abuts the guide rib; and / or, the guide rib is protruded from the second guide surface and is integrally formed with the second guide surface, and the first guide surface abuts the guide rib.

[0040] Based on the above embodiments, the attachment area of ​​the guide rib is larger, the structural stability is stronger, and it is not easy to deform.

[0041] In some embodiments, one of the first guide surface and the second guide surface is provided with a plurality of guide ribs, and the plurality of guide ribs are arranged side by side and at intervals along the transverse direction of the air supply channel. The plurality of guide ribs separate the air supply inlet into a plurality of sub-inlets, and the transverse direction of the air supply channel is perpendicular to the direction of airflow in the air supply channel and perpendicular to the direction from the first guide surface toward the second guide surface.

[0042] Based on the above embodiment, the pressure of the airflow entering the air supply channel is divided in this way, thereby reducing the impact on the second sub-component and the water receiving tray body.

[0043] In some embodiments, the guide rib extends along the longitudinal direction of the air-supplementing channel and from the air-supplementing inlet to the side where the air-supplementing outlet is located. The longitudinal direction of the air-supplementing channel is the direction of air flow in the air-supplementing channel.

[0044] Based on the above embodiment, the guiding effect of the guide ribs is enhanced and the wind resistance is reduced.

[0045] In some embodiments, in the transverse direction of the air supply channel, the distances between two adjacent guide ribs are equal.

[0046] Based on the above embodiment, it is ensured that the overall force is balanced when the second sub-component is installed with the water tray main body.

[0047] In some embodiments, the water tray assembly further includes a plurality of clamping blocks, each of the clamping blocks is protruded from the first guide surface, the second guide surface is provided with a plurality of clamping openings, and each of the clamping blocks is inserted into one of the clamping openings.

[0048] Based on the above embodiment, during assembly, the second sub-component and the water receiving tray body can be quickly aligned, the assembly is convenient, and the alignment stability of the second sub-component and the water receiving tray body is effectively improved, thereby improving the efficiency of manufacturing the air supply channel.

[0049] In some embodiments, the water receiving tray body and the first sub-component are an integral structure.

[0050] Based on the above embodiment, the number of assembly steps is reduced and the connection strength between the first sub-component and the water tray body is improved.

[0051] In some embodiments, the indoor unit further includes a filter component, which is disposed in the supplementary air channel and located at the supplementary air inlet or the supplementary air outlet.

[0052] Based on the above embodiments, the gas-infusing passage is prevented from being blocked by internal organs, thereby affecting the gas-infusing efficiency.

[0053] In some embodiments, the width of the air outlet portion is gradually expanded from the wind wheel toward the air outlet.

[0054] Based on the above embodiment, the gas pressure at the air outlet is increased in this way, so that the fluid at the air outlet can more easily enter the air supply channel through the air supply inlet.

[0055] In some embodiments, the wind wheel is a cross-flow wind wheel.

[0056] Based on the above embodiments, since the cross-flow impeller has the characteristics of high efficiency, low noise, compact design, wide application range and good stability, it can improve the air supply effect in the indoor unit and reduce the generation of noise.

[0057] In a second aspect, an embodiment of the present application provides a HVAC system, comprising an outdoor unit and an indoor unit as described above, wherein the indoor unit and the outdoor unit form a circulation flow path.

[0058] Based on the indoor unit and HVAC system of the embodiment of the present application, an air supply channel is formed in the housing, and the air supply inlet of the air supply channel is connected to the air outlet portion located between the impeller and the air outlet, and the air supply outlet of the air supply channel is connected to the air inlet portion located between the heat exchanger and the impeller. Based on this, the present application has the following technical effects:

[0059] Part of the fluid at the outlet of the duct can enter the air supply channel through the air supply inlet, and then be sent back to the air inlet of the duct through the air supply channel. This improves the flow of air near the wind wheel side of the heat exchanger, reduces the turbulent kinetic energy there, and thus has a noise reduction effect. At the same time, the air supply and drainage through the air supply channel makes the airflow near the wind wheel more stable, which can effectively reduce the size of the eccentric vortex of the wind wheel and improve the flow near the wind wheel, which is beneficial to improving aerodynamic efficiency. In addition, it improves the anti-static pressure performance, delays the occurrence of surge, and expands the operating range of the wind wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0061] FIG1 is a schematic structural diagram of an indoor unit according to an embodiment of the present application;

[0062] FIG2 is a cross-sectional structural diagram at AA in FIG1 ;

[0063] FIG3 is a partial enlarged view of point D in FIG2;

[0064] FIG4 is a cross-sectional structural diagram from another perspective at AA in FIG1 ;

[0065] FIG5 is a partial enlarged view of point A in FIG4 ;

[0066] FIG6 is a schematic diagram of an exploded structure of an indoor unit according to an embodiment of the present application;

[0067] FIG7 is a turbulent kinetic energy cloud diagram of an existing indoor unit without an air supply channel;

[0068] FIG8 is a turbulent kinetic energy cloud diagram of the indoor unit of the present application provided with an air supply channel;

[0069] FIG9 is a schematic structural diagram of the water receiving tray assembly of the indoor unit of the present application;

[0070] FIG10 is a schematic diagram of the assembly structure of the water receiving tray assembly of the indoor unit of the present application;

[0071] FIG11 is a schematic structural diagram of the second sub-component and the clamping block of the water receiving tray assembly of the indoor unit of the present application;

[0072] FIG12 is a partial enlarged view of point C in FIG10;

[0073] FIG13 is a streamline diagram of the simulation results in which no closed hollow cavity is formed at the volute tongue;

[0074] FIG14 is a partial enlarged view of point B in FIG8 .

[0075] Explanation of the accompanying figures: 100, indoor unit; 10, shell; 11, casing; 12, panel; 121, air outlet; 122, air inlet; 13, cover; 131, first straight segment; 14, water tray assembly; 141, water tray body; 1411, second guide surface; 1412, latching opening; 142, volute tongue; 142A, second straight segment; 1421, first sub-component; 1422, second sub-component; 142a, closed hollow cavity; 142b, first A guide surface; 143, a guide rib; 144, a block; 15, an air duct; 151, an air inlet; 152, an air outlet; L2, an extension line of the air outlet; 16, an air supply channel; 161, a first sub-channel; 162, a second sub-channel; 16A, an air supply inlet; L1, an extension line of the air supply inlet; 16a, a sub-inlet; 16B, an air supply outlet; 17, a supporting member; L3, an extension line of the air supply outlet; 20, a heat exchanger; 30, a wind wheel.

[0076] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical solutions and advantages of this application clearer, the following part will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0078] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0079] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0081] As one of the commonly used air conditioning equipment, the HVAC system is used to adjust the indoor ambient temperature (some HVAC systems also have functions such as humidity regulation and purification).

[0082] In related technologies, in the air duct of the indoor unit of the HVAC system, the position of the impeller and the heat exchanger is relatively close, resulting in a larger flow resistance on the side of the impeller close to the heat exchanger, making the surge phenomenon in the indoor unit more serious. Surge is a vibration phenomenon caused by fluid dynamics instability, which usually produces noise and unstable air flow, thereby affecting the user experience.

[0083] With reference to FIG1 , in order to solve the above-mentioned problem, the first aspect of the present application proposes a HVAC system. In the embodiment of the present application, the HVAC system includes but is not limited to equipment such as air conditioners, multi-split units, and heat pumps, and can be used in large-scale places such as shopping malls and office buildings. The HVAC system may include an indoor unit 100, an outdoor unit, and a connecting pipe. The indoor unit 100 is connected to the outdoor unit via a connecting pipe so that the indoor unit 100 and the outdoor unit form a circulation flow path. In some actual use scenarios, the indoor unit 100 of the present application can be installed indoors, the outdoor unit is responsible for cooling or heating, and transports refrigerant through the connecting pipe. The refrigerant exchanges heat with the indoor air and the outdoor air respectively, and the indoor unit 100 is responsible for transporting cold air or hot air to the room to achieve the effect of cooling or heating.

[0084] Specifically, the indoor unit 100 can include, but is not limited to, ceiling-mounted units, duct-mounted units, wall-mounted units, and floor-standing units. Specifically, the indoor unit 100 can be a ceiling-mounted unit. This installation method allows it to be hidden within a building's ceiling, eliminating the need for usable indoor space. This is particularly important for locations with limited space, such as offices, stores, and residences, as it allows for efficient use of space.

[0085] 1 to 3 , the second aspect of the present application further provides an indoor unit 100 , which includes a housing 10 , a heat exchanger 20 , and a wind wheel 30 .

[0086] The outer contour of the shell 10 can be set in a rectangular block shape. The shell 10 is provided with an air outlet 121 and an air inlet 122 at intervals on the bottom surface. When the indoor unit 100 is installed indoors, the bottom surface can be located on the ceiling and facing the indoor space. An air duct 15 is formed inside the shell 10, connecting the air inlet 122 and the air outlet 121. In this way, the indoor air flow can enter the air duct 15 through the air inlet 122 and then flow out from the air outlet 121. The air outlet 121 and the air inlet 122 are both located on the bottom surface, so that the indoor unit 100 only has one side for air intake and exhaust. Compared with the design of multi-side air outlet, the air flow path is simpler, which reduces energy loss, thereby reducing energy consumption, and is more conducive to the flat design of the indoor unit to be suitable for environments with smaller installation space.

[0087] The heat exchanger 20 and the impeller 30 are spaced apart in the air duct 15 along the air flow direction, and the heat exchanger 20 is located upstream of the impeller 30. The impeller 30 can be a crossflow impeller 30, a centrifugal impeller 30, or an axial flow impeller 30, among others. When the impeller 30 is configured as a crossflow impeller 30, the crossflow impeller 30 has the advantages of small radial size, low rotation speed, low noise, and uniform air output. Its axial length can be arbitrarily lengthened without affecting the gas flow state, among other advantages. Furthermore, compared to a centrifugal impeller 30 or an axial flow impeller 30, the crossflow impeller 30 has lower costs. The heat exchanger 20 can be in a variety of shapes, such as a straight line, a V-shape, an arc, or a wavy shape. The heat exchanger 20 is used to exchange heat with the gas passing through the heat exchanger 20, thereby cooling or heating the gas. For example, a plurality of refrigerant pipes are provided in the heat exchanger 20. When the gas passes through the heat exchanger 20, the gas exchanges heat with the refrigerant in the pipe, thereby changing the temperature of the gas. Specifically, during cooling, the gas exchanges heat with the refrigerant in the heat exchanger 20 to form low-temperature air; and during heating, the gas exchanges heat with the refrigerant in the heat exchanger 20 to form heated air.

[0088] The air duct 15 includes an air inlet 151 located between the heat exchanger 20 and the impeller 30, and an air outlet 152 located between the impeller 30 and the air outlet 121. When the HVAC system is operating, the impeller 30 rotates, and air enters the air duct 15 through the air inlet 122. After exchanging heat with the heat exchanger 20, the air flows to the air inlet 151. The heat-exchanged air then flows through the impeller 30 to the air outlet 152, and is then blown out into the room through the air outlet 121, thereby regulating the indoor ambient temperature.

[0089] The housing 10 also includes an air supply channel 16, which includes an air supply inlet 16A and an air supply outlet 16B. The air supply inlet 16A is connected to the air outlet 152, and the air supply outlet 16B is connected to the air inlet 151. Compare the turbulence kinetic energy cloud plots of the indoor unit without and with the air supply channel in Figures 7 and 8.

[0090] In this way, a portion of the fluid within the outlet 152 of the air duct 15 can enter the supplementary air channel 16 through the supplementary air inlet 16A, and then be re-delivered to the air inlet 151 of the air duct 15 via the supplementary air channel 16. Because the airflow direction of the supplementary air channel 16 differs from that of the airflow in the air inlet 151, the airflow emitted from the supplementary air outlet 16B of the supplementary air channel 16 can reduce the flow velocity of the airflow near the heat exchanger 20 near the impeller 30, thereby reducing the turbulent kinetic energy of the heat exchanger 20 near the impeller 30, thereby reducing noise. Furthermore, the direction of the airflow emitted from the supplementary air outlet 16B of the supplementary air channel 16 is close to the direction of rotation of the impeller 30, making the airflow near the impeller 30 more stable. This can effectively reduce the size of the eccentric vortex of the impeller 30 and improve the flow near the impeller 30, which is beneficial to improving aerodynamic efficiency. Furthermore, it enhances static pressure resistance, delays the occurrence of surge, and expands the operating range of the impeller 30.

[0091] Optionally, the width of the supplemental air channel 16 remains constant from the supplemental air inlet 16A toward the supplemental air outlet 16B. This maintains a stable flow of air through the supplemental air channel 16, thereby steadily maintaining the flow rate and gas throughput through the supplemental air channel 16, and thereby stabilizing the effect of supplemental air pressure boosting on the side of the impeller 30 near the heat exchanger 20. Alternatively, in another embodiment, the width of the supplemental air channel 16 gradually expands from the supplemental air inlet 16A toward the supplemental air outlet 16B. That is, the change in the width of the air supply channel 16 gradually increases from the air supply inlet 16A to the air supply outlet 16B. With this arrangement, the change in the width of the air supply channel 16 is initially small at the air supply inlet 16A, so that the air flow is evenly mixed during the process of entering the air supply channel 16. Thereafter, the change in the width of the air supply channel 16 continues to increase. While ensuring that no flow separation occurs in the air supply channel 16, the width change is as large as possible for the same channel length, which can ensure the air flow rate while reducing the air flow velocity, thereby achieving the purpose of optimizing the gas throughput and flow efficiency in the air supply channel 16 and reducing noise.

[0092] Referring to Figure 5, optionally, the width of the air supply channel 16 is L, and L is less than or equal to 3 mm and greater than or equal to 1.5 mm. Among them, when L is less than 1.5 mm, it is easy for the gas flow rate entering the air supply channel 16 from the air outlet 152 to be too small, so that the turbulent kinetic energy of the wind wheel 30 close to the heat exchanger 20 side cannot be effectively reduced. When L is greater than 3 mm, it is easy for the gas in the air supply channel 16 to dissipate and impact the fan, thereby generating additional noise. In this way, by limiting the width range of the air supply channel 16 to between 1.5 mm and 3 mm, the turbulent kinetic energy of the wind wheel 30 close to the heat exchanger 20 side is effectively reduced, and the impact of the gas on the wind wheel 30 is reduced. Exemplarily, L can be 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc., and the embodiments of the present application are not limited to this.

[0093] Referring to Figure 5 , in some configurations, the central axis of the air supply channel 16 is arranged in a curved configuration. Specifically, the air supply channel 16 can be arranged in a curved configuration, such as an arc or a wavy line. This can reduce the impact velocity of the airflow within the air supply channel 16, further reducing airflow noise and stabilizing airflow. It should be noted that in other embodiments, the air supply channel 16 can also be arranged in a straight line, thereby increasing air volume at the same speed of the wind wheel 30. Alternatively, the air supply channel 16 can be a combination of a straight line and a curved line, and the specific configuration can be selected by those skilled in the art based on their needs.

[0094] Furthermore, the supplemental air channel 16 includes a first sub-channel 161 and a second sub-channel 162, which are connected in sequence. The curvature of the central axis of the first sub-channel 161 and the curvature of the central axis of the second sub-channel 162 are different. By providing the first and second sub-channels 161 and 162 with different curvatures, the fluid is further decelerated, thereby reducing aerodynamic impact on the impeller 30 and improving sound quality. It is understood that the supplemental air channel 16 can also include multiple sections of flow channels with different curvatures to further enhance the deceleration effect on the gas within the supplemental air channel 16.

[0095] Optionally, the indoor unit 100 further includes a filter element (not shown). The filter element is disposed in the air supply passage 16 and is located at the air supply inlet 16A or the air supply outlet 16B. The filter element prevents clogging of the air supply passage 16, which could affect air supply efficiency. It is understood that the filter element can be a HEPA filter (High Efficiency Particulate Air Filter) and can be secured to the air supply inlet 16A or the air supply outlet 16B by adhesive or other means, facilitating regular removal and replacement of the filter element.

[0096] 2 to 5 , in some structural forms, the housing 10 includes a casing 11 , a panel 12 , a cover 13 and a water tray assembly 14 .

[0097] The housing 11 can be made of an alloy or metal such as aluminum or steel to meet requirements such as structural strength and long service life. Of course, the housing 11 can also be made of plastic to meet requirements such as light weight, and this application does not impose any restrictions on this. The housing 11 can provide protection and connect to the connection structure of the indoor environment.

[0098] The bottom of the housing 11 is open, and a panel 12 is provided to cover the open area. The air inlet 122 and the air outlet 121 are arranged at intervals on the panel 12. The panel 12 is usually detachably connected to the bottom of the housing 11. This facilitates the disassembly and assembly of the panel 12. During the later use of the indoor unit 100, if the electrical components inside the housing 11 malfunction, the panel 12 can be removed and the electrical components inside the housing 11 can be repaired. The connection between the panel 12 and the housing 11 can be via threaded fasteners or a snap-on connection. The connection method between the panel 12 and the housing 11 is not specifically limited.

[0099] The cover 13 and the water tray assembly 14 are disposed within the housing 11, with the cover 13 positioned above the water tray assembly 14. The housing 11, the cover 13, and the water tray assembly 14 cooperate to form an air duct 15. The cover 13 is used to construct a portion of the wall surface of the air duct 15 to facilitate control of the airflow direction. Furthermore, the housing 10 may further include a support member 17, which is detachably connected to the housing 11 and the cover 13 via snaps or screws and is positioned below the heat exchanger 20 to support the heat exchanger 20. The water tray assembly 14 is configured to receive condensed water from the heat exchanger 20. During operation of the indoor unit 100, condensed water typically adheres to the surface of the heat exchanger 20. Generally, to prevent excessive condensed water from adhering to the surface of the heat exchanger 20 and affecting its performance, a water tray assembly 14 is positioned below the bottom of the heat exchanger 20 to receive the condensed water.

[0100] The water receiving tray assembly 14 is provided with an air supply channel 16, an air supply inlet 16A, and an air supply outlet 16B. By directly providing the air supply channel 16 on the water receiving tray assembly 14, there is no need to provide additional components within the housing 10 to provide the air supply channel 16, making the structure within the housing 10 more compact.

[0101] Referring to Figures 9 and 10 , the water tray assembly 14 further includes a water tray body 141 and a volute 142. The volute 142 is connected to the water tray body 141 and positioned between the impeller 30 and the water tray body 141. The volute 142 and the water tray body 141 cooperate to form an air supply channel 16, an air supply inlet 16A, and an air supply outlet 16B. The air supply channel 16 is formed by the volute 142 and the water tray body 141. This allows the shape of the volute 142 to be controlled simultaneously when the shape of the volute 142 is adjusted. It is understood that the volute 142 is used to divert the airflow driven by the impeller 30, allowing a portion of the airflow to be directed to the air outlet 152 for discharge from the air outlet 121.

[0102] 2 and 3 , in some embodiments, the extended direction line L2 of the air outlet is tangent to the outer periphery of the wind wheel 30 , and the angle between the extended direction line L2 of the air outlet and the extended direction line L1 of the air supply channel 16 at the air supply inlet is θ, and θ is less than or equal to 105 degrees and greater than or equal to 85 degrees.

[0103] To more clearly define the relevant extension lines, in the cross-sectional view shown in Figure 2, the cover 13 has a first straight segment 131 extending toward the air outlet, and the tongue 142 has a second straight segment 142A also extending toward the air outlet. The second straight segment is positioned opposite the first straight segment 131. Specifically, the outlet portion's extension line L2 is located between, and equidistant from, the first and second straight segments 131, 142A.

[0104] Regarding the extended line L1 of the supplemental gas channel 16 at the supplemental gas inlet: In the cross-sectional views of Figures 2 and 3 , the supplemental gas channel 16 has two upper and lower edge lines at the supplemental gas inlet 16A. Within the plane of these two edge lines, there exists a center line equidistant from both edge lines. Starting from supplemental gas inlet 16A, extending this center line infinitely away from supplemental gas inlet 16A yields the straight line L1 of the supplemental gas channel 16 at the supplemental gas inlet.

[0105] Regarding the extension line L3 of the supplemental gas channel 16 at the supplemental gas outlet: Similarly, in the cross-sectional views of Figures 2 and 3 , the supplemental gas outlet also has two upper and lower edge lines. Within the plane of these two edge lines, there is a centerline equidistant from them. Starting from the supplemental gas outlet, extending this centerline infinitely in a direction away from the supplemental gas outlet results in a straight line representing the extension line L3 of the supplemental gas channel 16 at the supplemental gas outlet.

[0106] When θ is less than 85 degrees, most of the gas from the air outlet 152 will flow directly out of the air outlet 121 and will not easily flow into the air supply channel 16 from the air supply inlet 16A, thus failing to ensure the flow rate of gas from the air outlet 152 into the air supply channel 16. When θ is greater than 105 degrees, most of the gas from the air outlet 152 will flow directly into the air supply channel 16 from the air supply inlet 16A, resulting in an excessively high flow rate of the fluid entering the air supply channel 16. Furthermore, the excessive flow rate of the fluid from the air supply outlet 16B may affect the operation of the impeller 30. Thus, the angle θ between the extended line L1 of the air supply inlet of the air supply channel 16 and the extended line L2 of the air outlet is controlled to be between 85 and 105 degrees. This ensures the flow of gas from the air outlet 152 into the air supply channel 16 while limiting the flow rate of the fluid entering the air supply channel 16. This prevents the fluid flow rate at the air supply outlet 16B from being too high and affecting the operation of the impeller 30. Furthermore, it stabilizes the eccentric vortex of the impeller 30. For example, θ can be 85 degrees, 90 degrees, 95 degrees, 100 degrees, 105 degrees, etc., and is not limited in this embodiment of the present application.

[0107] 2 , in some configurations, the supplementary air passage 16 passes outside the impeller 30 along the extension line L3 of the supplementary air outlet. This reduces the impact of the gas flowing out of the supplementary air outlet 16B on the fan, further reducing the operating noise of the indoor unit 100.

[0108] Furthermore, the extended line L3 of the air supply channel 16 at the air supply outlet is parallel to one of the outer peripheral tangents of the wind wheel 30, and the distance between the extended line L3 of the air supply channel 16 at the air supply outlet and the outer peripheral tangent is D, which is less than or equal to 9 mm and greater than or equal to 3 mm. When D is greater than 9 mm, the airflow flowing out of the air supply outlet 16B of the air supply channel 16 cannot effectively suppress the size of the eccentric vortex of the wind wheel 30. When D is less than 3 mm, the airflow flowing out of the air supply outlet 16B of the air supply channel 16 is likely to directly impact the wind wheel 30, thereby generating noise and affecting the performance. By limiting D to between 3 mm and 9 mm, the eccentric vortex size of the wind wheel 30 can be effectively suppressed while preventing the airflow from the air supply outlet 16B of the air supply channel 16 from directly impacting the wind wheel 30, thereby reducing noise. For example, D can be 3 mm, 5 mm, 7 mm, 9 mm, etc., and this embodiment of the present application is not limited to this.

[0109] Referring to Figures 2 and 3 , in some configurations, the heat exchanger 20 is tilted above the air inlet 122, creating a minimum clearance between the heat exchanger 20 and the impeller 30. The supplemental air passage passes through this minimum clearance along a line L3 extending from the supplemental air outlet. This reduces the impact of gas flowing out of the supplemental air outlet 16B on the heat exchanger 20, further reducing operating noise in the indoor unit 100.

[0110] 5 , further, the volute tongue 142 includes a first sub-component 1421 and a second sub-component 1422 connected to each other. The first sub-component 1421 is connected to the water tray body 141, and the first sub-component 1421 and the water tray body 141 cooperate to form the air supply inlet 16A. Thus, by forming the volute tongue 142 by the first sub-component 1421 and the second sub-component 1422, which are separately provided, the two sub-components can be connected by screws or buckles, etc., to facilitate later maintenance and replacement.

[0111] The second sub-component 1422 is detachably connected to the water receiving tray body 141. The side of the second sub-component 1422 facing away from the impeller 30 is configured as a first guide surface 142b. The surface of the water receiving tray body 141 facing the second sub-component 1422 is configured as a second guide surface 1411. The second guide surface 1411 and the first guide surface 142b cooperate to form the air supply channel 16, and the second sub-component 1422 cooperates with the water receiving tray body 141 to form the air supply outlet 16B. Thus, the method of forming the air supply channel 16 by the second sub-component 1422 and the water receiving tray body 141 in this application can save the cost of the drilling process compared to the method of forming the air supply channel 16 by drilling, and it is more convenient to clean the air supply channel 16, reducing the possibility of blockage.

[0112] Furthermore, the water receiving tray body 141 and the first sub-component 1421 are an integrated structure, which not only saves installation steps but also improves the structural strength of the water receiving tray body 141 and the first sub-component 1421.

[0113] Referring to Figures 11 and 12 , the water tray assembly 14 optionally further includes a plurality of latches 144, each of which protrudes from the first guide surface 142b. The second guide surface 1411 defines a plurality of latching openings 1412, with each latch 144 inserted into one of the latching openings 1412. During assembly, simply inserting a latch 144 into a corresponding latching opening 1412 quickly aligns the water tray body 141 with the second sub-component 1422. This facilitates assembly, effectively improves the alignment stability of the water tray body 141 and the second sub-component 1422, and effectively prevents deformation of the water tray body 141 and the second sub-component 1422 when excessive wind pressure is applied. Furthermore, the water tray body 141 and the second sub-component 1422 can be connected using screws or other methods to further enhance the stability of the connection.

[0114] Optionally, the first guide surface 142b is configured as an arc. This allows the gas to be more easily diverted when passing through the first guide surface 142b, allowing it to more easily flow out of the air supply outlet 16B, thereby reducing the turbulent kinetic energy on the side of the impeller 30 near the heat exchanger 20. In other embodiments, the second guide surface 1411 may also be configured as an arc. Similarly, this allows the gas to be more easily diverted when passing through the second guide surface 1411, thereby reducing the turbulent kinetic energy on the side of the impeller 30 near the heat exchanger 20.

[0115] With reference to FIG5 , optionally, the first sub-component 1421 and the second sub-component 1422 enclose a sealed hollow cavity 142a. It is understood that the sealed hollow cavity 142a may include a first half cavity and a second half cavity, with the first sub-component 1421 enclosing the first half cavity and the second sub-component 1422 being recessed to enclose the second half cavity, thereby enclosing and forming the sealed hollow cavity 142a. Of course, the first sub-component 1421 alone may be recessed to enclose the sealed hollow cavity 142a, or the second sub-component 1422 may be recessed to enclose the sealed hollow cavity 142a, and this application is not limited thereto. Thus, compared to a configuration in which the first sub-component 1421 and the second sub-component 1422 are not hollow, this embodiment can reduce the material of the first sub-component 1421 and the second sub-component 1422, thereby reducing costs and weight, thereby reducing the overall weight of the indoor unit 100. 13 , when the cavity formed by the first sub-component 1421 and the second sub-component 1422 is not sealed, flow stagnation occurs, affecting aerodynamic performance. Therefore, the provision of the sealed hollow cavity 142a can also prevent fluid stagnation in the air supply channel 16 within the cavity between the first sub-component 1421 and the second sub-component 1422, thereby ensuring smooth flow of gas through the air supply channel 16.

[0116] 12 and 14 , in some structural forms, at least one guide rib 143 is provided on one of the first guide surface 142b and the second guide surface 1411, and the other of the first guide surface 142b and the second guide surface 1411 abuts against the at least one guide rib 143. In this way, the guide rib 143 can provide support for the water receiving tray body 141 and the second sub-component 1422, thereby reducing the possibility of deformation of the water receiving tray body 141 and the second sub-component 1422.

[0117] Furthermore, the guide rib 143 is protruding from the first guide surface 142b and is integrally formed with the first guide surface 142b, while the second guide surface 1411 abuts the guide rib 143. Alternatively, in another embodiment, the guide rib 143 is protruding from the second guide surface 1411 and is integrally formed with the second guide surface 1411, while the first guide surface 142b abuts the guide rib 143. In this manner, by integrally providing the guide rib 143 with one of the first guide surface 142b and the second guide surface 1411 and abutting the other, the guide rib 143 has a larger attachment area, greater structural stability, and stronger interaction between the guide rib 143, the water tray body 141, and the second sub-component 1422, making deformation less likely to occur.

[0118] Optionally, one of the first guide surface 142b and the second guide surface 1411 is provided with a plurality of guide ribs 143, and the plurality of guide ribs 143 are arranged side by side and at intervals along the transverse direction of the air supply channel 16. The plurality of guide ribs 143 separate the air supply inlet 16A into a plurality of sub-inlets 16a. The transverse direction of the air supply channel 16 is perpendicular to the direction of the air flow in the air supply channel 16 and perpendicular to the direction of the first guide surface 142b toward the second guide surface 1411. In this way, multiple guide ribs 143 are provided to further improve the structural stability of the water receiving tray main body 141 and the second sub-component 1422. At the same time, the multiple guide ribs 143 are used to separate the air supply inlet 16A into multiple sub-inlets 16a, and the air supply channel 16 is divided into multiple sub-ducts 15, so that the pressure of the air flow entering the air supply channel 16 is divided. The air flow pressure entering a single sub-duct 15 is relatively small, and the force of the air flow in each sub-duct 15 on the docking water tray main body 141 and the second sub-component 1422 is also relatively small, thereby reducing the impact of the docking water tray main body 141 and the second sub-component 1422, thereby further reducing the deformation of the water receiving tray main body 141 and the second sub-component 1422 caused by the air flow entering the return duct 15.

[0119] Optionally, the guide ribs 143 extend longitudinally along the air supply channel 16 from the air supply inlet 16A to the side where the air supply outlet 16B is located, and the longitudinal direction of the air supply channel 16 is the direction of air flow in the air supply channel 16. This can enhance the guiding effect of the guide ribs 143 and reduce wind resistance.

[0120] Optionally, in the transverse direction of the air supply channel 16, the spacing between two adjacent guide ribs 143 is equal. This facilitates processing and ensures that the second sub-component 1422 and the water receiving tray body 141 are subjected to overall force balance when they are installed.

[0121] The above is an explanation of the specific structural example of the indoor unit of the embodiment of the present application. It can be understood that since the HVAC system of the present application adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0122] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0123] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An indoor unit, wherein: include: The housing has an air outlet and an air inlet spaced apart on the bottom surface, and an air duct connecting the air inlet and the air outlet is formed inside the housing; as well as The heat exchanger and the wind wheel are arranged at intervals in the air duct along the air flow direction, and the heat exchanger is located upstream of the wind wheel; In which, the shell also forms an air supply channel, the air supply channel includes an air supply inlet and an air supply outlet, the air duct includes an air inlet located between the heat exchanger and the wind wheel and an air outlet located between the wind wheel and the air outlet, the air supply inlet is connected to the air outlet, and the air supply outlet is connected to the air inlet.

2. The indoor unit according to claim 1, wherein: The extended direction line of the air outlet is tangent to the outer periphery of the wind wheel, and the included angle θ between the extended direction line of the air outlet and the extended direction line of the air supply channel at the air supply inlet is less than or equal to 105 degrees and greater than or equal to 85 degrees.

3. The indoor unit according to claim 1 or 2, wherein: The air supply channel passes through the outer side of the wind wheel along the extension line of the air supply outlet.

4. The indoor unit according to claim 3, wherein: The air supply channel is parallel to one of the peripheral tangents of the wind wheel at the direction extension line of the air supply outlet, and the distance between the air supply channel and the peripheral tangent is D, and D is less than or equal to 9 mm and greater than or equal to 3 mm.

5. The indoor unit according to any one of claims 1 to 4, wherein: The heat exchanger is tiltedly arranged above the air inlet, a minimum distance space is formed between the heat exchanger and the wind wheel, and the air supply channel passes through the minimum distance space in the direction extension line of the air supply outlet.

6. The indoor unit according to any one of claims 1 to 5, wherein: In a direction from the air supplement inlet to the air supplement outlet, the width of the air supplement channel remains constant or is gradually expanded.

7. The indoor unit according to any one of claims 1 to 6, wherein: The width of the air supply channel is L, and L is less than or equal to 3 mm and greater than or equal to 1.5 mm.

8. The indoor unit according to any one of claims 1 to 7, wherein: The central axis of the air supplement channel is arranged in a curve.

9. The indoor unit according to claim 8, wherein: The gas supplement channel includes a first sub-channel and a second sub-channel that are sequentially connected, and the curvature of the central axis of the first sub-channel is different from the curvature of the central axis of the second sub-channel.

10. The indoor unit according to any one of claims 1 to 9, wherein: The housing includes a casing, a panel, a cover, and a water receiving pan assembly. The bottom of the casing is open, the panel cover is provided at the open position, the air inlet and the air outlet are arranged at intervals on the panel, the cover and the water receiving pan assembly are provided in the casing, and the cover is located above the water receiving pan assembly. The casing, the cover, and the water receiving pan assembly cooperate to form the air duct, and the water receiving pan assembly is configured to carry condensed water from the heat exchanger. The water receiving tray assembly is provided with the air supply channel, the air supply inlet and the air supply outlet.

11. The indoor unit according to claim 10, wherein: The water receiving tray assembly includes a water receiving tray body and a volute tongue, the volute tongue is connected to the water receiving tray body, the volute tongue is located between the wind wheel and the water receiving tray body, and the volute tongue and the water receiving tray body cooperate to form the air supply channel, the air supply inlet and the air supply outlet.

12. The indoor unit according to claim 11, wherein: The volute tongue includes a first sub-component and a second sub-component connected to each other, wherein the first sub-component is connected to the water receiving tray body, and the first sub-component and the water receiving tray body cooperate to form the air supply inlet; The second sub-component is detachably connected to the water receiving tray main body, and the side of the second sub-component facing away from the wind wheel is configured as a first guide surface, and the surface of the water receiving tray main body facing the second sub-component is configured as a second guide surface. The second guide surface and the first guide surface cooperate to form the air supply channel, and the second sub-component cooperates with the water receiving tray main body to form the air supply outlet.

13. The indoor unit according to claim 12, wherein: The first guide surface and / or the second guide surface are / is arranged in an arc shape.

14. The indoor unit according to claim 12, wherein: The first sub-component and the second sub-component are enclosed to form a closed hollow cavity.

15. The indoor unit according to claim 12, wherein One of the first guide surface and the second guide surface is provided with at least one guide rib, and the other of the first guide surface and the second guide surface abuts against the at least one guide rib.

16. The indoor unit according to claim 15, wherein: The guide rib is convexly provided on the first guide surface and is integrally formed with the first guide surface, and the second guide surface abuts against the guide rib; And / or, the guide rib is protruding from the second guide surface and is formed integrally with the second guide surface, and the first guide surface is in contact with the guide rib.

17. The indoor unit according to claim 15, wherein: One of the first guide surface and the second guide surface is provided with a plurality of guide ribs, and the plurality of guide ribs are arranged side by side and at intervals along the transverse direction of the air supply channel. The plurality of guide ribs divide the air supply inlet into a plurality of sub-inlets. The transverse direction of the air supply channel is perpendicular to the direction of airflow in the air supply channel and perpendicular to the direction from the first guide surface toward the second guide surface.

18. The indoor unit according to claim 15, wherein The guide ribs extend along the longitudinal direction of the air-supplementing channel and from the air-supplementing inlet to the side where the air-supplementing outlet is located. The longitudinal direction of the air-supplementing channel is the direction of air flow in the air-supplementing channel.

19. The indoor unit according to claim 15, wherein: In the transverse direction of the air supply channel, the distances between two adjacent guide ribs are equal.

20. The indoor unit according to claim 12, wherein: The water receiving tray assembly further comprises a plurality of clamping blocks, each of which is protruding from the first guide surface. The second guide surface is provided with a plurality of clamping openings, and each of the clamping blocks is plugged into one of the clamping openings.

21. The indoor unit according to claim 12, wherein: The water receiving tray main body and the first sub-component are an integrated structure.

22. The indoor unit according to any one of claims 1 to 21, wherein: The indoor unit further includes a filter component, which is disposed in the supplementary air passage and located at the supplementary air inlet or the supplementary air outlet.

23. The indoor unit according to any one of claims 1 to 22, wherein: The width of the air outlet portion is gradually expanded from the wind wheel toward the air outlet.

24. The indoor unit according to any one of claims 1 to 23, wherein: The wind wheel is a cross-flow wind wheel.

25. A heating and ventilation system, wherein: The invention comprises an outdoor unit and the indoor unit according to any one of claims 1 to 24, wherein the indoor unit and the outdoor unit form a circulation flow path.

Images