Indoor unit of air conditioner

Abstract

The utility model provides an indoor unit of an air conditioner. The air conditioner indoor unit comprises a shell. The heat exchange air duct communicates with the indoor air inlet and the indoor air outlet. According to the draught fan, a draught fan air inlet communicated with the indoor air inlet is formed in a volute, and an air duct cavity is formed in the volute and communicated with the heat exchange air duct. The air inlet ring is connected to an air inlet of the fan, and an assembly gap is formed between the air inlet ring and the impeller, so that the impeller does not make contact with the air inlet ring when rotating; the sealing ring is arranged in the assembling gap, and at least part of the sealing ring extends in the axial direction of the impeller so as to prevent airflow from flowing into the fan air inlet from the assembling gap; the at least two first protruding parts are connected into an inner ring of the sealing ring and protrude towards a rotating shaft of the impeller, and the multiple first protruding parts are arranged at intervals. The first protruding part is provided with a protruding curved surface so as to guide airflow entering from the fan air inlet to flow along the protruding curved surface, and prevent backflow airflow flowing in the axial direction of the impeller from entering the assembling gap so as to reduce backflow of air in the air channel cavity to the fan air inlet.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to an indoor unit of an air conditioner. Background Art

[0002] With the widespread use of air conditioners, people have put forward the demand for less noise and more energy-saving operation.

[0003] The air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes a shell, which is provided with an indoor air inlet and an indoor air outlet. A heat exchange duct connecting the indoor air inlet and the indoor air outlet is formed in the shell. The heat exchange duct is connected to the fan, and an indoor heat exchanger is also arranged in the heat exchange duct.

[0004] The fan rotates to form a low-pressure area at the fan, driving the air flow from the indoor air inlet into the fan, and then flows along the heat exchange duct to the indoor heat exchanger, and then blows out from the indoor air outlet after exchanging heat with the indoor heat exchanger.

[0005] An air duct cavity is formed in the volute of the fan, and an air inlet of the fan is also arranged on the volute. An air inlet ring is arranged at the air inlet of the fan, and an impeller is arranged inside the air duct cavity.

[0006] In the prior art, in order to reduce the probability of collision between the rotating impeller and the air inlet ring, a certain assembly gap is provided between the side of the air inlet ring closest to the impeller and the outer edge of the impeller. Due to the existence of the assembly gap, the airflow in the air duct cavity leaks back from the assembly gap, affecting the air volume, and the return airflow collides with the incoming airflow, generating aerodynamic noise. Utility Model Content

[0007] The utility model solves one of the technical problems in the related art at least to a certain extent.

[0008] To this end, the present application aims to provide an air-conditioning indoor unit.

[0009] The indoor unit of the air conditioner according to the present application comprises: a housing, on which an indoor air inlet and an indoor air outlet are provided;

[0010] A heat exchange air duct is arranged in the shell and connects the indoor air inlet and the indoor air outlet;

[0011] The fan is arranged inside the housing, and includes:

[0012] A volute, wherein a fan air inlet connected to an indoor air inlet is provided on the volute, and an air duct cavity is formed in the volute, and the air duct cavity is connected to a heat exchange air duct;

[0013] The impeller is arranged opposite to the air inlet of the fan; the impeller rotates to drive the air flow from the indoor air inlet into the air inlet of the fan, and then flows through the air duct cavity and the heat exchange air duct, and then blows out from the indoor air outlet to the indoor space;

[0014] The air inlet ring is connected to the air inlet of the fan, and an assembly gap is formed between the air inlet ring and the impeller so that the impeller does not contact the air inlet ring when rotating;

[0015] A sealing ring is arranged in the assembly gap, and the sealing ring at least partially extends along the axial direction of the impeller to block the air flow from the assembly gap into the air inlet of the fan;

[0016] At least two first protrusions are connected to the inner ring of the sealing ring and protrude toward the rotating shaft of the impeller, and the plurality of first protrusions are arranged at intervals;

[0017] The first protrusion has a protruding curved surface to guide the airflow entering from the air inlet of the fan to flow along the protruding curved surface and to block the return airflow flowing along the axial direction of the impeller from entering the assembly gap.

[0018] The indoor unit of the air conditioner according to the present application comprises: a housing, on which an indoor air inlet and an indoor air outlet are provided;

[0019] A heat exchange air duct is arranged in the shell and connects the indoor air inlet and the indoor air outlet;

[0020] The fan is arranged inside the housing, and includes:

[0021] A volute, a fan air inlet connected to the indoor air inlet is provided on the front side plate of the volute, an air duct cavity is formed in the volute, and the air duct cavity is connected to the heat exchange air duct;

[0022] The impeller is arranged opposite to the air inlet of the fan; the impeller rotates to drive the air flow from the indoor air inlet into the air inlet of the fan, and then flows through the air duct cavity and the heat exchange air duct, and then blows out from the indoor air outlet to the indoor space;

[0023] The air inlet ring is connected to the air inlet of the fan, and an assembly gap is formed between the air inlet ring and the impeller so that the impeller does not contact the air inlet ring when rotating;

[0024] A sealing ring is arranged in the assembly gap, and the sealing ring at least partially extends along the axial direction of the impeller to block the air flow from the assembly gap into the air inlet of the fan;

[0025] The side of the sealing ring closest to the impeller is defined as the first side, and the distance between the first side and the front side plate of the volute along the axial direction of the impeller is L1;

[0026] The distance between the part of the impeller closest to the fan air inlet and the front side plate of the volute along the impeller axis is L2;

[0027] L1≥L2, the sealing ring and the impeller overlap in the axial direction of the impeller, so that the airflow outside the sealing ring and flowing along the radial direction of the impeller cannot flow into the assembly gap.

[0028] In some embodiments of the present application, the air conditioner indoor unit includes at least two first protrusions, which are connected to the inner ring of the sealing ring and protrude toward the rotating shaft of the impeller, and the plurality of first protrusions are arranged at intervals;

[0029] The first protrusion has a protruding curved surface to guide the airflow entering from the air inlet of the fan to flow along the protruding curved surface and to block the airflow in the assembly gap from flowing toward the air inlet of the fan.

[0030] In some embodiments of the present application, the first protrusion is a cylinder, and the bottom surface of the cylinder is an incomplete ellipse.

[0031] In some embodiments of the present application, the ellipse where the bottom surface of the cylinder is located has two foci, and the straight line where the two foci are located is the first connecting line;

[0032] There are two intersection points A1 and B1 between the bottom surface of the cylinder and the first side surface. The circle with point O1 as the center and the two intersection points A1 and B1 is circle O1. Point O1 is on the rotation axis of the inner ring surface of the sealing ring. In circle O1, the midpoint of the arc with the smaller central angle where the two intersection points A1 and B1 are located is C1, and the tangent line of circle O1 at the midpoint C1 is the first tangent line.

[0033] The angle between the first connecting line and the first tangent line is not 90°.

[0034] In some embodiments of the present application, the first protrusions are arranged in a circular array in the inner ring of the sealing ring, and the number of the first protrusions is not less than ten.

[0035] In some embodiments of the present application, the side surface of the outer ring of the sealing ring is an annular bending surface, and multiple planes or curved surfaces are connected to each other to form an annular bending surface, and the connection between two adjacent planes or curved surfaces is arranged opposite to the first protrusion.

[0036] In some embodiments of the present application, the length of the first protrusion extending along the axial direction of the impeller is L3, and the length of the inner side surface of the sealing ring extending along the axial direction of the impeller is L4, L3≥L4, so that the first protrusion blocks the airflow inside the sealing ring from flowing out of the fan inlet.

[0037] In some embodiments of the present application, the volute has a volute front side plate provided with a fan air inlet, the sealing ring is fixedly connected to the volute front side plate, and the sealing ring is integrally formed with the volute.

[0038] In some embodiments of the present application, the fan is a centrifugal fan, and the impeller includes blades and a fixing ring. The end of the blade close to the fan air inlet is connected to the fixing ring, and the fixing ring is connected to the side of the blade away from the impeller rotation axis. The fixing ring is at least partially located inside the sealing ring.

[0039] This application has at least the following positive effects:

[0040] The utility model provides an indoor unit of an air conditioner. The indoor unit of the air conditioner comprises a shell, a heat exchange air duct is connected to an indoor air inlet and an indoor air outlet; the fan comprises: a fan air inlet connected to the indoor air inlet is arranged on the volute, an air duct cavity is formed in the volute, and the air duct cavity is connected to the heat exchange air duct; an air inlet ring is connected to the air inlet of the fan, and an assembly gap is formed between the air inlet ring and the impeller so that the impeller does not contact the air inlet ring when rotating; a sealing ring is arranged in the assembly gap, and the sealing ring at least partially extends along the axial direction of the impeller to block the air flow from the assembly gap into the fan air inlet; at least two first protrusions are connected to the sealing ring. The sealing ring is in the inner ring of the ring and protrudes toward the rotating axis of the impeller, and multiple first protrusions are arranged at intervals; the first protrusion has a convex curved surface to guide the airflow entering from the fan inlet to flow along the convex curved surface, and block the return airflow flowing along the axial direction of the impeller from entering the assembly gap, so as to reduce the gas in the air duct cavity to flow back to the fan inlet, reduce the impact between the incoming gas and the return gas, reduce aerodynamic noise, and reduce air leakage. The sealing ring has a simple structure and is easy to install and produce. The first protrusion can play a good drainage effect and blocking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 is a view of the appearance of an air conditioner indoor unit according to an embodiment of the present application;

[0043] Figure 2 is a view of the appearance of an air conditioner indoor unit according to an embodiment of the present application with a portion of the front panel removed;

[0044] Figure 3 is a view of the appearance of an air conditioner indoor unit according to an embodiment of the present application with part of the housing removed;

[0045] Figure 4 is a disassembled view of a fan of an indoor unit of an air conditioner according to an embodiment of the present application;

[0046] Figure 5 is a front view of a fan of an indoor unit of an air conditioner according to an embodiment of the present application;

[0047] Figure 6 is a view from another perspective of the fan of the indoor unit of the air conditioner according to the embodiment of the present application;

[0048] Figure 7 yes Figure 6 CC section view in the figure;

[0049] Figure 8 yes Figure 6 CC section view in the figure;

[0050] Fig. 9 yes Figure 8 A in the enlarged view;

[0051] Fig.10 A view of a sealing ring of an indoor unit of an air conditioner according to an embodiment of the present application;

[0052] Fig.11 yes Fig.10 The enlarged view in B;

[0053] Fig.12 A view of a sealing ring of an indoor unit of an air conditioner according to an embodiment of the present application;

[0054] Fig.13 yes Fig.10 The enlarged view in D;

[0055] Fig.14 A view of a sealing ring of an indoor unit of an air conditioner according to an embodiment of the present application;

[0056] In the above figures: 100, air conditioner indoor unit; 1, shell; 11, indoor air inlet; 12, indoor air outlet; 13, heat exchange air duct; 14, top plate; 15, base; 2, fan; 21, volute; 211, volute front side plate; 212, fan air inlet; 213, fan air outlet; 22, impeller; 221, blades; 222, fixing ring; 23, air inlet ring; 24, assembly gap; 3, sealing ring; 31, first protrusion; 311, protruding curved surface; 312, bottom surface; 32, annular bending surface; 33, avoidance gap. DETAILED DESCRIPTION

[0057] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0058] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first", "second" may explicitly or implicitly include one or more of the features.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the following, reference will be made to the Figure 1-14 The embodiments of the present application are described in detail.

[0062] The air conditioner includes a compressor, a condenser, an expansion valve and an evaporator, and performs a refrigeration cycle or a heating cycle through the compressor, the condenser, the expansion valve and the evaporator. The refrigeration cycle and the heating cycle include a compression process, a condensation process, an expansion process and an evaporation process, and provide cooling or heat to the indoor space through the heat absorption and heat release process of the refrigerant to achieve temperature regulation of the indoor space.

[0063] The compressor compresses the refrigerant gas into a high-temperature and high-pressure state and discharges the compressed refrigerant gas, which flows into the condenser. The condenser condenses the compressed high-temperature and high-pressure gaseous refrigerant into liquid refrigerant, and the heat is released to the surrounding environment through the condensation process.

[0064] The liquid refrigerant flowing out of the condenser enters the expansion valve, which expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The low-pressure liquid refrigerant flowing out of the expansion valve enters the evaporator. When the liquid refrigerant flows through the evaporator, it absorbs heat and evaporates into a low-temperature and low-pressure refrigerant gas. The low-temperature and low-pressure refrigerant gas returns to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0065] The air conditioner includes an air conditioner indoor unit 100, an air conditioner outdoor unit and an expansion valve. The air conditioner outdoor unit includes a compressor and an outdoor heat exchanger. The air conditioner indoor unit 100 includes an indoor heat exchanger. The expansion valve can be provided in the air conditioner indoor unit 100 or the air conditioner outdoor unit.

[0066] The indoor heat exchanger and the outdoor heat exchanger can function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0067] With the widespread use of air conditioners, people have put forward demands for the air conditioner indoor unit 100 to have lower noise and less air leakage.

[0068] The air conditioner indoor unit 100 is arranged in the indoor space, and is used to provide processed cold air flow or warm air flow to the indoor space, so as to adjust the temperature and humidity of the indoor space. The air conditioner indoor unit 100 comprises a housing 1, on which an indoor air inlet 11 and an indoor air outlet 12 are arranged, and a heat exchange air duct 13 connecting the indoor air inlet 11 and the indoor air outlet 12 is formed in the housing 1, the heat exchange air duct 13 is connected to the fan 2, and an indoor heat exchanger is also arranged in the heat exchange air duct 13.

[0069] An air duct cavity is formed in the volute 21 of the fan 2, and a fan air inlet 212 is also provided on the volute 21. An air inlet ring 23 is provided at the fan air inlet 212, and an impeller 22 is provided inside the air duct cavity. In order to reduce the probability of collision between the rotating impeller 22 and the air inlet ring 23, a certain assembly gap 24 is provided between the side of the air inlet ring 23 closest to the impeller 22 and the outer edge of the impeller 22.

[0070] Due to the existence of the assembly gap 24, the airflow in the air duct cavity will flow back from the assembly gap 24 to the fan air inlet 212, affecting the air volume. On the other hand, the returning airflow will impact the incoming airflow, generating aerodynamic noise.

[0071] In the prior art, in order to reduce the amount of air flowing out from the assembly gap 24 between the impeller 22 and the air inlet ring 23, a curved concave annular structure is provided on the side of the impeller 22 close to the air inlet ring 23, and the air inlet ring 23 is provided as a convex annular structure that cooperates with the concave annular structure, so that a curved bend is formed between the impeller 22 and the air inlet ring 23. If the airflow wants to flow back to the fan air inlet 212, it can only pass through the curved bend in the assembly gap 24. The curved bend increases the resistance of gas reflux, reduces the amount of gas reflux, and reduces the leakage of air volume. However, this technical solution causes the impeller 22 to be processed with a concave annular structure, and there are certain difficulties in processing the impeller 22. The steps during installation are complicated, and the impeller 22 is prone to collide with the air inlet ring 23 when it rotates.

[0072] The present application provides an air-conditioning indoor unit 100 with less air leakage, less aerodynamic noise, simple structure and low production cost.

[0073] When the air-conditioning indoor unit 100 is a vertical air-conditioning indoor unit 100 or a wall-mounted air-conditioning indoor unit 100 and the fan 2 of the air-conditioning indoor unit 100 is a centrifugal fan 2, they are all within the protection scope of the present application.

[0074] The technical solution of the present application is described in detail below by taking the vertical air-conditioning indoor unit 100 as an example.

[0075] The vertical air conditioner indoor unit 100 comprises a housing 1, a top plate 14 and a base 15, wherein the top plate 14 and the base 15 are respectively arranged at the top and the bottom of the housing 1. The extension direction of the housing 1 between the top plate 14 and the base 15 is the height direction of the vertical air conditioner indoor unit 100.

[0076] The housing 1 is provided with an indoor air inlet 11 and an indoor air outlet 12. It should be noted that in some air conditioner indoor units 100, the indoor air inlet 11 is provided on the front housing 1, and the indoor air inlet 11 is located on the same side of the indoor air outlet 12. In other embodiments, the indoor air inlet 11 is provided on the rear housing 1, and the indoor air inlet 11 is located on the rear side of the indoor air outlet 12. The indoor air inlet 11 provided on any side of the housing 1 is within the protection scope of the present application.

[0077] The heat exchange air duct 13 is disposed in the housing 1 , and the heat exchange air duct 13 is connected to the indoor air inlet 11 and the indoor air outlet 12 .

[0078] The fan 2 is arranged inside the housing 1, and includes a volute 21 and an impeller 22. The volute 21 is provided with a fan air inlet 212 connected to the indoor air inlet 11, and an air duct cavity is formed inside the volute 21, and the air duct cavity is connected to the heat exchange air duct 13. The fan 2 of the air conditioner indoor unit 100 of the present application is a centrifugal fan 2, which can change the flow direction of the indoor return air.

[0079] The air duct cavity is connected to the fan outlet 213 and the fan inlet 212. The fan inlet 212 can be set to a circular or elliptical fan inlet 212. The fan inlet 212 is communicated with the indoor air inlet 11.

[0080] The fan outlet 213 is connected to the heat exchange duct 13 to drive the air flow to blow out to the heat exchange duct 13. The gas exchanges heat with the indoor heat exchanger in the heat exchange duct 13, absorbs the cold or heat released by the indoor heat exchanger, and is blown out from the indoor outlet 12 to the indoor space.

[0081] An impeller 22 is provided in the air duct cavity, and the impeller 22 is arranged opposite to the fan air inlet 212. The impeller 22 is generally a cylindrical structure with a hole in the middle. The impeller 22 rotates to drive the air flow from the indoor air inlet 11 into the fan air inlet 212, and then flows through the air duct cavity and the heat exchange air duct 13, and then blows out from the indoor air outlet 12 to the indoor space. The air flow flows into the impeller 22 along the axial direction of the impeller 22, is thrown by the impeller 22 to flow along the radial direction of the impeller 22, and the air flow flows along the air duct cavity to the heat exchange air duct 13.

[0082] The air inlet ring 23 is connected to the air inlet 212 of the fan, and an assembly gap 24 is formed between the air inlet ring 23 and the impeller 22 so that the impeller 22 does not contact the air inlet ring 23 when rotating.

[0083] When the airflow passes through the air duct cavity in the volute 21, the airflow is driven by the impeller 22 to enter the air duct cavity from the fan air inlet 212, and then is thrown into the air outlet of the fan 2 by the high-speed rotating impeller 22, forming a high-pressure area on the outer peripheral side of the impeller 22 in the air duct cavity. At this time, the area between the air inlet circle 23 and the impeller 22 is relatively a low-pressure area, part of the airflow flows from the high-pressure area to the low-pressure area, and the airflow flows from the outer peripheral side of the impeller 22 to the assembly gap 24, and finally flows out of the air duct cavity from the air inlet circle 23, causing the airflow in the air duct cavity to leak from the fan air inlet 212, causing air volume loss, and the backflow airflow and the airflow entering the air inlet circle 23 will conflict, causing aerodynamic noise, emitting a "puff" sound.

[0084] In order to solve the above problems, the fan 2 of the air conditioner indoor unit 100 of the present application includes a sealing ring 3, which is a relatively flat annular structure. The sealing ring 3 is located inside the volute 21 and is correspondingly arranged at the fan air inlet 212.

[0085] The sealing ring 3 is arranged in the assembly gap 24, and the sealing ring 3 at least partially extends along the axial direction of the impeller 22. When the airflow flows from the outer peripheral side of the impeller 22 to the assembly gap 24, since the sealing ring 3 is arranged in the assembly gap 24, when the airflow outside the sealing ring 3 reaches the sealing ring 3, it is blocked from continuing to flow toward the fan air inlet 212, which can reduce the backflow air volume.

[0086] The sealing ring 3 blocks part of the airflow and closes part of the assembly gap 24. The airflow can only flow back from the gap between the inner ring side of the sealing ring 3 and the impeller 22 to the opening inside the air inlet ring 23, and cannot flow directly from the gap between the air inlet ring 23 and the impeller 22. A semi-closed flow channel is formed between the sealing ring 3, the impeller 22 and the air inlet ring 23, which can effectively reduce the amount of gas reflux compared to the previous completely unclosed flow channel.

[0087] At least two first protrusions 31 are disposed on the inner ring side surface of the sealing ring 3 . The first protrusions 31 protrude from the inner ring side surface of the sealing ring 3 toward the rotating shaft of the impeller 22 . The plurality of first protrusions 31 are disposed at intervals.

[0088] The first protrusion 31 has a protruding curved surface 311. On the one hand, when the airflow flows from the fan air inlet 212 to the sealing ring 3, the protruding curved surface 311 can guide the airflow entering from the fan air inlet 212 to flow along the protruding curved surface 311. Compared with the convex surface with edges and corners, the protruding curved surface 311 can reduce the resistance of the air inlet.

[0089] On the other hand, the convex curved surface 311 can block the return airflow flowing along the axial direction of the impeller 22 from entering the assembly gap 24 , thereby reducing the airflow leaking from the gap between the inner ring side of the sealing ring 3 and the impeller 22 .

[0090] Compared with the prior art, the air conditioner indoor unit 100 of the present application blocks part of the gas flowing back from the assembly gap 24 by setting a sealing ring 3 between the air inlet ring 23 and the impeller 22. The surface of the sealing ring 3 is also provided with a first protrusion 31 with a convex curved surface 311. The first protrusion 31 can block the gas flowing back from the gap between the inner ring side of the sealing ring 3 and the impeller 22, further reducing the gas reflux. Moreover, since the first protrusion 31 has the convex curved surface 311, it can have a good drainage effect on the airflow flowing into the air duct cavity. Compared with the prior art solution in which a recessed annular structure is provided on the impeller 22 and the air inlet ring 23 forms a curved flow channel, the sealing ring 3 of the present application is easier to install and produce. The sealing ring 3 can play a drainage role. The first protrusion 31 can also block part of the airflow from flowing out, and the sealing effect is better.

[0091] In some embodiments of the present application, the first protrusion 31 is a cylinder, and the bottom surface 312 of the cylinder is an incomplete ellipse. The first protrusion 31 has two bottom surfaces 312, one bottom surface 312 is provided on the side of the first protrusion 31 close to the fan air inlet 212, and the other bottom surface 312 is provided on the side of the first protrusion 31 close to the impeller 22, and the side surface of the cylinder is provided between the two bottom surfaces 312, and the side surface of the cylinder extends along the axial direction of the impeller 22.

[0092] In some embodiments of the present application, the ellipse where the bottom surface 312 of the cylinder is located has two foci, and the straight line where the two foci are located is the first connecting line;

[0093] There are two intersection points A1 and B1 between the bottom surface 312 of the cylinder and the first side surface. The circle where the two intersection points A1 and B1 are located and the point O1 is the center is circle O1. Point O1 is on the rotation axis of the inner ring surface of the sealing ring 3. In circle O1, the midpoint of the arc where the two intersection points A1 and B1 are located and the central angle is smaller is C1. The tangent line of circle O1 at the midpoint C1 is the first tangent line.

[0094] The angle between the first connecting line and the first tangent line is not 90°, so that the column is arranged tilted, so that the drainage effect of the inclined curved side surface of the column is better.

[0095] In some embodiments of the present application, the first protrusions 31 are arranged in a circular array in the inner ring of the sealing ring 3 , and the number of the first protrusions 31 is not less than ten.

[0096] In the embodiment illustrated in the present application, the number of first protrusions 31 is not less than 30, and the spacing between two adjacent first protrusions 31 is not greater than 12 mm, so that the number of first protrusions 31 is large to enhance the guiding effect on the airflow and enhance the blocking effect on the backflow airflow.

[0097] In some embodiments of the present application, a fan air inlet 212 connected to the indoor air inlet 11 is provided on the front side plate of the volute 21, and an air inlet ring 23 is connected to the fan air inlet 212. An assembly gap 24 is formed between the air inlet ring 23 and the impeller 22 so that the impeller 22 does not contact the air inlet ring 23 when rotating. The sealing ring 3 is arranged in the assembly gap 24, and the sealing ring 3 at least partially extends along the axial direction of the impeller 22 to block the airflow from the assembly gap 24 into the fan air inlet 212.

[0098] The side of the sealing ring 3 closest to the impeller 22 is defined as: the distance between the first side and the front side plate of the volute 21 along the axial direction of the impeller 22 is L1; the distance between the part of the impeller 22 closest to the fan air inlet and the front side plate of the volute 21 along the axial direction of the impeller 22 is L2.

[0099] L1≥L2, the sealing ring 3 and the impeller 22 overlap in the axial direction of the impeller 22, so that the airflow outside the sealing ring 3 and flowing along the radial direction of the impeller 22 cannot flow into the assembly gap 24. When the airflow is thrown to the outside of the impeller 22 by the impeller 22, since the end of the impeller 22 close to the fan air inlet 212 is arranged inside the sealing ring 3, the airflow cannot flow in from the outside of the sealing ring 3, and the sealing ring 3 effectively blocks the gap between the impeller 22 and the sealing ring 3 extending along the axial direction of the impeller 22. The airflow can only flow in from the gap between the inner ring side of the sealing ring 3 and the outer side of the impeller 22, further reducing the airflow flowing out of the assembly gap 24. Compared with the prior art, the sealing ring 3 can effectively block the airflow, and the installation and manufacturing of the sealing ring 3 are simpler, which is a significant improvement over the prior art.

[0100] The fan 2 of the air conditioner indoor unit 100 of the present application is a centrifugal fan 2, which can change the flow direction of indoor return air.

[0101] The centrifugal fan 2 includes a volute 21 disposed at its outermost side, the volute 21 includes a volute front side plate 211 provided with a fan air inlet 212, and an air duct cavity is formed in the volute 21, and the air duct cavity connects the fan air outlet 213 and the fan air inlet 212. The fan air inlet 212 can be set to a circular or elliptical fan air inlet 212.

[0102] The fan air inlet 212 of the centrifugal fan 2 is connected to the indoor air inlet 11. It should be noted that in some air conditioner indoor units 100, the indoor air inlet 11 is arranged on the front housing 1, and the indoor air inlet 11 is located on the same side of the indoor air outlet 12. In other embodiments, the indoor air inlet 11 is arranged on the rear housing 1, and the indoor air inlet 11 is located on the rear side of the indoor air outlet 12. The indoor air inlet 11 is arranged on any side of the housing 1, which is within the protection scope of this application.

[0103] The fan outlet 213 of the centrifugal fan 2 is connected to the heat exchange air duct 13 to drive the air flow to be blown out to the heat exchange air duct 13. The gas exchanges heat with the indoor heat exchanger in the heat exchange air duct 13, absorbs the cold or heat released by the indoor heat exchanger, and is blown out from the indoor air outlet 12 to the indoor space.

[0104] In order to reduce the air inlet resistance of the centrifugal fan 2, an air inlet ring 23 is usually provided at the fan air inlet 212, and the air inlet ring 23 is connected to the volute front side plate 211. The air inlet ring 23 includes an outer peripheral fixing ring 222 connected to the volute front side plate 211, and also includes an inner peripheral drainage ring for draining airflow.

[0105] The outer peripheral fixing ring 222 is connected to the front side plate 211 of the volute through a snap-on structure, and the outer peripheral fixing ring 222 and the inner peripheral drainage ring are integrally formed or separately formed. The front side plate 211 of the volute is provided with a fixing port, and the outer peripheral fixing ring 222 is provided with an extension hook, which is connected to the fixing port to fix the air inlet ring 23 and the front side plate 211 of the volute. It should be noted that there are one or more extension hooks, and the number of fixing ports is equal to the number of extension hooks. When there are multiple extension hooks, the multiple extension hooks are arranged in a circular array, and the multiple fixing ports are arranged in a circular array so that a single extension hook is connected to a single fixing port.

[0106] The outer peripheral fixing ring 222 is connected to the front side plate 211 of the volute through a clamping structure, and the clamping structure has one or more. The plurality of clamping structures are arranged in a circular array on the outer peripheral fixing ring 222 .

[0107] In order to avoid the snap-fit ​​structure, an avoidance notch 33 is provided on the sealing ring 3. The number of the avoidance notches 33 is the same as the number of the snap-fit ​​structures. It should be noted that the extension length of the avoidance notch 33 on the sealing ring 3 along the axial direction of the sealing ring 3 is not greater than half of the axial extension length of the sealing ring 3.

[0108] The inner peripheral drainage ring is a curved surface structure, and the curved surface where the outer side of the inner peripheral drainage ring is located is the first drainage curved surface, which is a curved surface that bends from top to bottom toward the inside of the air duct cavity, and the first drainage curved surface at least partially extends along the axial direction of the impeller 22 to guide the air flow into the air duct cavity along the axial direction of the impeller 22. When the air duct cavity is under negative pressure, the air flow enters from the fan air inlet 212, and when the air flow flows close to the air inlet ring 23, the first drainage curved surface guides the air flow flowing along the outer surface of the air inlet ring 23 into the air duct cavity. The surface of the first drainage curved surface is smooth to reduce the loss of air volume caused by the collision between the air flow and the first drainage curved surface.

[0109] The inner diameter of the air inlet ring 23 is smaller than the inner diameter of the fan air inlet, so that the inner peripheral guide ring of the air inlet ring 23 is located inside the air duct cavity to guide the air flow along the air inlet ring 23 into the air duct cavity.

[0110] An impeller 22 is provided in the air duct cavity. The impeller 22 is installed inside the air duct cavity. The impeller 22 is roughly a cylindrical structure with a hole in the middle. The impeller 22 includes a mounting bracket and a rotating wheel. The mounting bracket is arranged in the middle of the rotating wheel. The rotating wheel includes blades 221 and a fixing ring 222. There are multiple blades 221. The fixing ring 222 is fixed to the top end of the impeller 22 so that the length direction of the blade 221 extends along the axial direction of the impeller 22. The fixing ring 222 fixes and supports the multiple blades 221.

[0111] At least one fixing ring 222 is located on the side of the blade 221 close to the fan air inlet, and the fixing ring 222 is located at the outermost edge of the impeller 22. The outer diameter of the fixing ring 222 is the maximum outer diameter of the part of the impeller 22 close to the fan air inlet 212. An assembly gap 24 is provided between the fixing ring 222 and the air inlet ring 23 of the impeller 22.

[0112] When the fan 2 rotates, a low-pressure area is formed inside the impeller 22, and the impeller 22 is arranged opposite to the fan air inlet 212, so that the airflow directly enters the impeller 22 from the fan air inlet 212, shortening the flow path of the gas entering the impeller 22.

[0113] The impeller 22 rotates to drive the airflow entering the center of the impeller 22 to change its flow direction, and the airflow changes from flowing along the axial direction of the impeller 22 to flowing along the radial direction of the impeller 22. A fan 2 outlet duct extending along the radial direction of the impeller 22 is formed in the volute 21, and the fan 2 outlet duct is connected to the inlet of the heat exchange duct 13, so that the airflow flowing along the radial direction of the impeller 22 flows directly from the fan 2 outlet duct into the heat exchange duct 13 without changing the flow direction of the airflow again.

[0114] The impeller 22 is roughly a cylindrical structure with a hole in the middle. The impeller 22 includes a mounting bracket and a rotating wheel. The mounting bracket is arranged in the middle of the rotating wheel. The rotating wheel includes blades 221 and a fixing ring 222. There are multiple blades 221. The fixing ring 222 is fixed to the top of the impeller 22 so that the length direction of the blades 221 extends along the axial direction of the impeller 22. The fixing ring 222 fixes and supports the multiple blades 221.

[0115] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An air conditioner indoor unit, characterized in that: include: A housing, on which an indoor air inlet and an indoor air outlet are provided; A heat exchange air duct, which is arranged in the shell and connects the indoor air inlet and the indoor air outlet; A fan is arranged inside the housing, and the fan comprises: A volute, wherein the volute is provided with a fan air inlet connected to the indoor air inlet, and an air duct cavity is formed in the volute, and the air duct cavity is connected to the heat exchange air duct; An impeller, the impeller being arranged opposite to the fan air inlet; the impeller rotates to drive the air flow from the indoor air inlet into the fan air inlet, and then flows through the air duct cavity and the heat exchange air duct, and then blows out from the indoor air outlet to the indoor space; An air inlet ring connected to the air inlet of the fan, with an assembly gap formed between the air inlet ring and the impeller so that the impeller does not contact the air inlet ring when rotating; A sealing ring, which is arranged in the assembly gap, and the sealing ring at least partially extends along the axial direction of the impeller to block the air flow from the assembly gap into the air inlet of the fan; At least two first protrusions connected to the inner ring side surface of the sealing ring and protruding toward the rotating axis of the impeller, wherein the plurality of first protrusions are arranged at intervals; The first protrusion has a convex curved surface to guide the airflow entering from the air inlet of the fan to flow along the convex curved surface and to block the return airflow flowing along the axial direction of the impeller from entering the assembly gap.

2. An air conditioner indoor unit, characterized in that: include: A housing, on which an indoor air inlet and an indoor air outlet are provided; A heat exchange air duct, which is arranged in the shell and connects the indoor air inlet and the indoor air outlet; A fan is arranged inside the housing, and the fan comprises: A volute, wherein a fan air inlet connected to the indoor air inlet is provided on a front side plate of the volute, and an air duct cavity is formed in the volute, and the air duct cavity is connected to the heat exchange air duct; An impeller, the impeller being arranged opposite to the fan air inlet; the impeller rotates to drive the air flow from the indoor air inlet into the fan air inlet, and then flows through the air duct cavity and the heat exchange air duct, and then blows out from the indoor air outlet to the indoor space; An air inlet ring connected to the air inlet of the fan, with an assembly gap formed between the air inlet ring and the impeller so that the impeller does not contact the air inlet ring when rotating; A sealing ring, which is arranged in the assembly gap, and the sealing ring at least partially extends along the axial direction of the impeller to block the air flow from the assembly gap into the air inlet of the fan; The side of the sealing ring closest to the impeller is defined as the first side, and the distance between the first side and the front side plate of the volute along the axial direction of the impeller is L1; The distance between the part of the impeller closest to the fan air inlet and the front side plate of the volute along the axial direction of the impeller is L2; L1≥L2, the sealing ring and the impeller overlap in the axial direction of the impeller, so that the airflow outside the sealing ring and flowing along the radial direction of the impeller cannot flow into the assembly gap.

3. The air conditioner indoor unit according to claim 2, characterized in that: The air conditioner indoor unit comprises at least two first protrusions, which are connected to the inner ring of the sealing ring and protrude toward the rotating shaft of the impeller, and the plurality of first protrusions are arranged at intervals; The first protrusion has a convex curved surface to guide the airflow entering from the fan air inlet to flow along the convex curved surface and block the airflow in the assembly gap from flowing toward the fan air inlet.

4. The air conditioner indoor unit according to claim 1 or 3, characterized in that: The first protrusion is a cylinder, and the bottom surface of the cylinder is an incomplete ellipse.

5. The air conditioner indoor unit according to claim 4, characterized in that: The ellipse where the bottom surface of the cylinder is located has two foci, and the straight line where the two foci are located is the first connecting line K1; There are two intersection points A1 and B1 between the bottom surface of the cylinder and the side surface of the sealing ring closest to the impeller. The circle with point O1 as the center and the two intersection points A1 and B1 is circle O1, and point O1 is on the rotation axis of the inner annular surface of the sealing ring; in circle O1, the midpoint of the arc with the smaller central angle where the two intersection points A1 and B1 are located is C1, and the tangent line of circle O1 at the midpoint C1 is the first tangent line K2; The angle between the first connecting line K1 and the first tangent line K2 is not 90°.

6. The air conditioner indoor unit according to claim 1 or 3, characterized in that: The first protrusions are arranged in a circular array in the inner ring of the sealing ring, and the number of the first protrusions is not less than ten.

7. The air conditioner indoor unit according to claim 1 or 3, characterized in that: The side surface of the outer ring of the sealing ring is an annular bending surface, and a plurality of planes or curved surfaces are connected to each other to form the annular bending surface, and the connection between two adjacent planes or curved surfaces is arranged opposite to the first protrusion.

8. The air conditioner indoor unit according to claim 1 or 3, characterized in that: The length of the first protrusion extending along the axial direction of the impeller is L3, and the length of the inner side surface of the sealing ring extending along the axial direction of the impeller is L4, L3≥L4, so that the first protrusion blocks the airflow inside the sealing ring from flowing out of the fan inlet.

9. The air conditioner indoor unit according to claim 1, 2 or 3, characterized in that: The volute has a volute front side plate provided with the fan air inlet, the sealing ring is fixedly connected to the volute front side plate, and the sealing ring is integrally formed with the volute.

10. The air conditioner indoor unit according to claim 1, 2 or 3, characterized in that: The fan is a centrifugal fan, and the impeller includes blades and a fixing ring. One end of the blade close to the fan air inlet is connected to the fixing ring, and the fixing ring is connected to the side of the blade away from the impeller rotation axis. The fixing ring is at least partially located inside the sealing ring.

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