Air conditioner indoor unit, air supply control method thereof and air conditioner

Abstract

The invention provides an air conditioner indoor unit, an air supply control method thereof and an air conditioner. The air conditioner indoor unit comprises an air conditioner shell, a heat exchanger and a fan. An air inlet is formed in the top of the air conditioner shell, and an air outlet is formed in the bottom of the air conditioner shell and located in the front wall of the air conditioner shell. The heat exchanger and the fan are both located in the air conditioner shell, and the fan is close to the heat exchanger. The heat exchanger divides the internal space of the air conditioner shell into a first cavity and a second cavity, and the first cavity communicates with the second cavity through gaps between fins of the heat exchanger. A fresh air opening is formed in the rear wall of the air conditioner shell, and the air inlet and the fresh air opening directly communicate with the first cavity. And the air outlet is directly communicated with the second cavity. The air conditioner indoor unit comprises a single fresh air opening mode, and in the single fresh air opening mode, the fresh air opening and the air outlet are both opened, and the air inlet is closed. When the air conditioner indoor unit introduces fresh air, an air increasing structure is not needed, the whole machine structure is simplified, the fresh air volume is large, and noise is low.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning indoor unit and an air supply control method thereof, and an air conditioner. Background Art

[0002] At present, fresh air air conditioners have become increasingly popular. Fresh air air conditioners need to add fresh air motors and fresh air structures, and the design of the inner machine casing needs to be lengthened, which increases the cost and also affects the appearance.

[0003] There is an existing fresh air air conditioner, which adds a horizontally arranged fresh air duct on the left side of the evaporator, and is provided with a circular air inlet pipe and structure extending downward, and absorbs outside air by increasing the speed of the internal fan to introduce fresh air. Although this solution simplifies the air intake method and structure, it still involves major changes in the structural parts, requires a very high speed to absorb fresh air, and the effect of introducing fresh air is average, and the noise is also loud.

[0004] There is also an air conditioner that can control the forward or reverse rotation of the motor to make the indoor air flow out through the air exchange duct or make the outdoor air flow in through the air exchange duct. However, in this solution, the air conditioner is a window unit, and the window unit uses a single motor. The inner and outer fans rotate in opposite directions at the same time. It does not have a special fresh air channel. When the motor rotates forward, the outdoor part is to exhaust the hot air outdoors, and the fresh air is to be drawn into the room. The two directions are opposite, so the air volume that can enter the volute is very small, and the wind in the positive and reverse directions cancel each other out, and the air supply effect is not good. Summary of the invention

[0005] The first object of the present invention is to provide an air conditioner indoor unit which does not require a new air intake structure when introducing fresh air, simplifies the overall structure, has a large fresh air volume and low noise.

[0006] A second object of the present invention is to provide an air supply control method for the above-mentioned air conditioner indoor unit.

[0007] A third object of the present invention is to provide an air conditioner using the above-mentioned air conditioner indoor unit.

[0008] To achieve the above first purpose, the present invention provides an air conditioner indoor unit, including an air conditioner housing, a heat exchanger and a fan; an air inlet is provided at the top of the air conditioner housing, an air outlet is provided at the bottom of the air conditioner housing, and the air outlet is located on the front wall of the air conditioner housing; the heat exchanger and the fan are both located in the air conditioner housing, and the fan is arranged close to the heat exchanger; the heat exchanger divides the internal space of the air conditioner housing into a first cavity and a second cavity, and the first cavity and the second cavity are connected through the gap between the fins of the heat exchanger; a fresh air inlet is provided on the rear wall of the air conditioner housing, and the air inlet and the fresh air inlet are directly connected to the first cavity; and the air outlet is directly connected to the second cavity. The air conditioner indoor unit includes a single fresh air mode, in which the fresh air inlet and the air outlet are both open, and the air inlet is closed.

[0009] As can be seen from the above scheme, the internal space of the air conditioner housing is divided into two cavities by the heat exchanger, and a fresh air outlet connected to the first cavity is opened on the rear wall of the air conditioner housing. In this way, when the air conditioner indoor unit is in the single fresh air mode, there is no air inlet except the fresh air outlet in the closed first cavity and the second cavity, and only air outlet is formed, so that the outdoor fresh air can be sucked into the room. Compared with the prior art, the fresh air and heat exchange air of the air conditioner indoor unit can be realized by the existing fan, without the need to set up a special fresh air fan and fresh air duct, simplifying the structure of the whole machine. At the same time, in the fresh air mode, the negative pressure inside the air conditioner housing is large, the fresh air volume is large and the noise is small, and a large amount of fresh air can be delivered.

[0010] A preferred solution is that the fan includes a blade drive and a crossflow blade, the blade drive can drive the crossflow blade to rotate forward or reverse; the crossflow blade includes a blade bracket and an air guide blade group connected to each other; the air guide blade group includes a first air guide portion and a second air guide portion, the first air guide portion is used to generate an airflow blown in a first direction when the crossflow blade rotates forward, and the second air guide portion is used to generate an airflow blown in a second direction when the crossflow blade rotates reversely.

[0011] It can be seen that by forming a closed cavity in the air conditioner housing, and then by the forward and reverse rotation of the crossflow fan blades, positive and negative pressures are formed in the cavity, so that fresh air from the outside is sucked into the room, or dirty air in the room is discharged to the outside. At the same time, by providing a first air guide that can generate airflow when the fan blades rotate forward and a second air guide that generates airflow when the fan blades rotate reversely, it is ensured that the fan can deliver a large air volume in both forward and reverse rotations.

[0012] A further solution is that the wind guide blade group includes a plurality of wind outlet blades arranged at intervals along the circumference of the wind blade bracket, each wind outlet blade includes a first wind guide portion and a second wind guide portion, and the first wind guide portion and the second wind guide portion are bent in opposite directions.

[0013] It can be seen that the blades of the existing crossflow fan blades are curved with a single curvature. When the crossflow fan blade rotates in the forward direction, the air can be shoveled inside the curved arc to form a strong airflow, while when the crossflow fan blade rotates in the reverse direction, the air flows outside the curved arc along the blade surface and does not form a large airflow. The present invention can generate a large airflow when the crossflow fan blade rotates in the forward and reverse directions by arranging the first air guide part and the second air guide part curved in opposite directions.

[0014] A further solution is that each first air guide portion and its corresponding second air guide portion gradually move away from each other from an end close to the central axis of the fan blade support to an end far away from the central axis of the fan blade support.

[0015] A further solution is that each first air guide portion is connected to an end of its corresponding second air guide portion close to the central axis of the fan blade bracket.

[0016] A preferred solution is that the first air guide portion in each air outlet blade is connected to the second air guide portion in the air outlet blade and is arranged along the radial direction of the blade support.

[0017] A preferred solution is that the fan blade support includes a first support plate and a second support plate; there are multiple first air guide portions, each of which is arranged at intervals along the circumference of the first support plate, and the first air guide portion and the first support plate form a first fan blade segment; there are multiple second air guide portions, each of which is arranged at intervals along the circumference of the second support plate, and the second air guide portion and the second support plate form a second fan blade segment; the first air guide portion and the second air guide portion are bent in opposite directions; the first fan blade segment and the second fan blade segment are arranged along the axial direction of the fan blade support.

[0018] A further solution is that the number of at least one of the first fan blade segments and the second fan blade segments is more than two, and the first fan blade segments and the second fan blade segments are alternately arranged along the axial direction of the fan blade bracket.

[0019] It can be seen that the first blade segment and the second blade segment are alternately arranged along the axial direction of the blade support, so that a good air supply effect can be produced regardless of whether the crossflow blade rotates forward or reversely, ensuring a uniform air supply effect in the axial direction of the crossflow blade.

[0020] A preferred solution is that a fresh air cover and a fresh air driving component are provided at the fresh air inlet, and the fresh air driving component can drive the fresh air cover to open or close the fresh air inlet; an outlet air guide plate and an outlet air guide driving component are provided at the air outlet, and the outlet air guide driving component can drive the outlet air guide plate to open or close the air outlet; an inlet air guide plate and an inlet air guide driving component are provided at the air inlet, and the inlet air guide driving component can drive the inlet air guide plate to open or close the air inlet.

[0021] It can be seen that the fresh air drive drives the fresh air cover to open or close the fresh air outlet, the outlet air guide drive drives the outlet air guide plate to open or close the air outlet, and the inlet air guide drive drives the inlet air guide plate to open or close the air inlet. In different modes, each air guide plate or cover cooperates with the corresponding vent to realize the opening and closing of each vent, thereby ensuring the air outlet or exhaust effect to the greatest extent.

[0022] A further solution is that, in the single fresh air mode, the fresh air cover opens the fresh air outlet, the outlet air guide plate opens the air outlet, the inlet air guide plate closes the air inlet, and the fan rotates in the forward direction.

[0023] A further solution is that the air-conditioning indoor unit includes a cooling mode or a heating mode. In the cooling mode or the heating mode, when the fresh air mode is turned on at the same time, the fresh air cover opens the fresh air inlet, the outlet air guide plate opens the air outlet, the inlet air guide plate closes at least a part of the air inlet, and the fan rotates forward.

[0024] It can be seen that in the cooling mode or the heating mode, when the fresh air mode is turned on at the same time, when the air inlet is completely closed, there is no air inlet except the fresh air inlet in the closed first cavity, only air outlet, and a strong negative pressure can be formed, so that the outdoor fresh air can be sucked into the first cavity of the air conditioner indoor unit, and the heat exchanger blows the fresh air into the room after heat exchange. However, since the size of the fresh air inlet is small, the air inlet is not opened, and the air intake at this time is all fresh air from the outside, the amount of fresh air inhaled will be small, and the heat exchange effect will be worse. In order to further increase the air volume, a part of the air inlet can be opened, and a part of the indoor return air can be added for mixing and then sent to the room through the heat exchanger, so that the air supply volume can be guaranteed and the comfort can be improved. In addition, since the fresh air is sucked in by negative pressure, if the air inlet is fully opened, the negative pressure in the closed first cavity will be reduced, the negative pressure for the fresh air will be reduced, and the effect of the outdoor fresh air being introduced will be worse. Therefore, the present invention ensures the fresh air volume while improving the heat exchange effect by closing at least a part of the air inlet.

[0025] A further solution is that when the inlet air guide plate only closes a portion of the air inlet, the opened portion of the air inlet is located at an end of the air inlet away from the fresh air outlet.

[0026] It can be seen that the opened part of the air inlet is located at the end of the air inlet away from the fresh air outlet, which can minimize the impact of the negative pressure at the fresh air outlet.

[0027] A preferred solution is that the air-conditioning indoor unit includes a lower exhaust mode, in which the fresh air cover opens the fresh air inlet, the outlet air guide plate opens the air outlet, the inlet air guide plate closes the air inlet, and the fan rotates in the opposite direction; and / or the air-conditioning indoor unit includes an upper exhaust mode, in which the fresh air cover opens the fresh air inlet, the outlet air guide plate closes the air outlet, the inlet air guide plate closes a part of the air inlet, and the fan rotates in the opposite direction.

[0028] It can be seen that in the lower exhaust mode, by opening the fresh air inlet and the air outlet and closing the air inlet, and at the same time, the fan rotates in the opposite direction, the strong positive pressure in the cavity of the air conditioner shell will force the dirty air in the lower part of the room to pass through the air outlet and the fresh air inlet, and then be discharged to the outside through the fresh air duct. In the upper exhaust mode, by opening the fresh air inlet and the air inlet and closing the air outlet, and at the same time, the fan rotates in the opposite direction, the strong positive pressure in the cavity of the air conditioner shell will force the dirty air in the upper part of the room to pass through the air inlet and the fresh air inlet, and then be discharged to the outside through the fresh air duct.

[0029] A preferred solution is that the air-conditioning indoor unit also includes an air duct shell, which is located in the second cavity, and an air supply channel is provided in the air duct shell, and the fan and the air outlet are respectively located at two ends of the air supply channel; a movable baffle is provided at one end of the air supply channel close to the fan, and a gap is formed at the closest point between the air duct shell and the fan, and the movable baffle is provided close to the gap, and the movable baffle can be switched between a stop position and a retracted position; when in the stop position, the movable baffle extends from the air duct shell toward the fan, and the distance between the movable baffle and the fan is smaller than the width of the gap; when in the retracted position, the movable baffle fits against the inner wall of the air duct shell.

[0030] It can be seen that the width of the gap formed at the closest point between the air duct housing and the fan is usually in the range of 5 mm to 10 mm. The smaller the gap here, the more the wind guided by the crossflow fan blades is intercepted, resulting in a larger air volume at the outlet.

[0031] A further solution is that the air-conditioning indoor unit includes a single fresh air mode, in which the movable baffle is in the stop position; and / or the air-conditioning indoor unit includes a lower exhaust mode, in which the movable baffle is in the stop position; and / or the air-conditioning indoor unit includes an upper exhaust mode, in which the movable baffle is in the stop position; and / or the air-conditioning indoor unit includes a cooling mode or a heating mode, in which the movable baffle is in the retracted position.

[0032] It can be seen that when the fresh air mode is turned on, the positive pressure generated in the cavity is greater due to the blocking of the airflow by the movable baffle, and the fresh air effect is better. In the lower exhaust mode and upper exhaust mode, the positive pressure generated in the cavity is greater due to the blocking of the airflow by the movable baffle, and the exhaust effect is better.

[0033] To achieve the above-mentioned second purpose, the present invention provides an air supply control method for an air-conditioning indoor unit, which is applied to the above-mentioned air-conditioning indoor unit; the air supply control method includes: in the single fresh air mode, opening the fresh air inlet and the air outlet, and closing the air inlet.

[0034] To achieve the third objective, the present invention provides an air conditioner, comprising an air conditioner outdoor unit and the air conditioner indoor unit connected to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a cross-sectional view of a first embodiment of an air conditioner indoor unit of the present invention.

[0036] Figure 2 It is a rear view of the first embodiment of the air conditioner indoor unit of the present invention.

[0037] Figure 3 It is a structural schematic diagram of the first embodiment of the air conditioner indoor unit of the present invention with some components hidden.

[0038] Figure 4 yes Figure 3 Schematic diagram of the structure after the inlet air guide plate is hidden.

[0039] Figure 5 It is a schematic diagram of the structure of the cross-flow fan blade in the first embodiment of the air conditioner indoor unit of the present invention.

[0040] Figure 6 It is a schematic diagram of the flow direction of airflow when the fresh air mode is turned on in the first embodiment of the air conditioner indoor unit of the present invention.

[0041] Figure 7 It is a schematic diagram of the flow direction of the airflow when the first embodiment of the air conditioner indoor unit of the present invention is in cooling mode or heating mode and the fresh air mode is turned on at the same time.

[0042] Figure 8 It is a schematic diagram of the air flow direction of the first embodiment of the air conditioner indoor unit of the present invention in the downward exhaust mode.

[0043] Fig. 9 It is a schematic diagram of the air flow direction of the first embodiment of the air conditioner indoor unit of the present invention in the upper exhaust mode.

[0044] Fig.10 It is a structural schematic diagram of a second embodiment of an air conditioner indoor unit of the present invention.

[0045] Fig.11 yes Fig.10 A partial enlarged view of point A in the middle.

[0046] Fig.12 It is a schematic diagram of the flow direction of airflow when the fresh air mode is turned on in the second embodiment of the air conditioner indoor unit of the present invention.

[0047] Fig.13 Schematic diagram of the air flow direction of the second embodiment of the air conditioner indoor unit of the present invention in the downward exhaust mode.

[0048] Fig.14 Schematic diagram of the air flow direction of the second embodiment of the air conditioner indoor unit of the present invention in the upper exhaust mode.

[0049] Fig.15 It is a schematic diagram of the structure of the cross-flow fan blade in the third embodiment of the air conditioner indoor unit of the present invention.

[0050] Fig.16 It is a schematic diagram of the structure of the cross-flow fan blade in the fourth embodiment of the air conditioner indoor unit of the present invention.

[0051] Fig.17 It is a schematic diagram of the overall structure of the crossflow fan blade in the fifth embodiment of the air conditioner indoor unit of the present invention.

[0052] Fig.18 It is a schematic structural diagram of the first fan blade segment of the crossflow fan blade in the fifth embodiment of the air conditioner indoor unit of the present invention.

[0053] Fig.19 It is a schematic structural diagram of the second fan blade segment of the crossflow fan blade in the fifth embodiment of the air conditioner indoor unit of the present invention.

[0054] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0055] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limitations.

[0056] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] In the present invention, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0058] All terms (including technical terms or scientific terms) used in the present invention have the same meanings as those understood by ordinary technicians in the field, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0059] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0060] The first embodiment of the air conditioner indoor unit: See also Figures 1 to 6 The air conditioner includes an air conditioner outdoor unit and an air conditioner indoor unit which are connected to each other.

[0061] The air conditioner indoor unit includes an air conditioner housing 1, a heat exchanger 2, a fan 3 and a water receiving pan 4. An air inlet 11 is provided at the top of the air conditioner housing 1, an air outlet 12 is provided at the bottom of the air conditioner housing 1, and the air outlet 12 is located at the front wall 16 of the air conditioner housing 1. The heat exchanger 2 and the fan 3 are both located in the air conditioner housing 1, and the fan 3 is arranged close to the heat exchanger 2. The water receiving pan 4 is arranged below the heat exchanger 2 for receiving condensed water flowing down from the heat exchanger 2. The heat exchanger 2 includes a first heat exchange section 21, a second heat exchange section 22 and a third heat exchange section 23 which are connected in sequence. The two adjacent heat exchange sections are arranged at an angle. The free end of the first heat exchange section 21 is adjacent to the rear wall 17 of the air-conditioning casing 1, the free end of the third heat exchange section 23 is in contact with the water receiving tray 4, and the free end of the third heat exchange section 23 is close to the front wall 16 of the air-conditioning casing 1. The heat exchanger 2 divides the internal space of the air-conditioning casing 1 into a first cavity 14 and a second cavity 15 arranged along the vertical direction. The first cavity 14 and the second cavity 15 are connected through the gap between the fins of the heat exchanger 2. A fresh air vent 13 is provided on the rear wall 17 of the air-conditioning casing 1; the air inlet 11 and the fresh air vent 13 are directly connected to the first cavity 14; the air outlet 12 is directly connected to the second cavity 15; the first cavity 14 is connected to the outside only through the fresh air vent 13, the air inlet 11 and the gap between the fins of the heat exchanger 2; the second cavity 15 is connected to the outside only through the gap between the fins of the heat exchanger 2 and the air outlet 12.

[0062] See also Figure 5 The fan 3 includes a blade drive and a crossflow blade 31. The blade drive can drive the crossflow blade 31 to rotate forward or reverse. The crossflow blade 31 includes a blade bracket 311 and an air guide blade group 310 connected to each other. The air guide blade group 310 includes a plurality of air outlet blades 312 arranged at intervals along the circumference of the blade bracket 311. Each air outlet blade 312 is in a herringbone shape. Specifically, each air outlet blade 312 includes a first air guide portion 313 and a second air guide portion 314. The first air guide portion 313 and the second air guide portion 314 are bent in opposite directions. The first air guide portion 313 is used to generate an airflow blowing along a first direction when the crossflow blade 31 rotates forward (i.e., counterclockwise). When the crossflow blade 31 rotates counterclockwise, Figure 5 The middle A1 surface can scoop the wind, and the second air guide portion 314 is used to generate an airflow blowing out in a second direction when the cross flow fan blade 31 rotates in the reverse direction (i.e. clockwise). When the cross flow fan blade 31 rotates clockwise, Figure 5 The middle A2 surface can shovel wind.

[0063] The blades of the existing crossflow fan blades are curved with a single curvature. When the crossflow fan blades rotate in the forward direction, the air can be shoveled inside the curved arc to form a strong airflow. When the crossflow fan blades rotate in the reverse direction, the air flows along the surface of the blades outside the curved arc, and no large airflow is formed. The present invention forms a closed cavity in the air-conditioning housing 1, and then forms positive and negative pressures in the cavity through the forward and reverse rotation of the crossflow fan blades 31, so that fresh air from the outdoor is sucked into the room, or the dirty air in the room is discharged to the outdoor. At the same time, by providing a first air guide 313 that can generate airflow when the fan blades rotate in the forward direction and a second air guide 314 that generates airflow when the fan blades rotate in the reverse direction, it is ensured that the fan 3 can deliver a large amount of air in both forward and reverse rotations.

[0064] Each first air guide 313 is connected to its corresponding second air guide 314 at one end close to the central axis of the fan bracket 311 and at one end away from the central axis of the fan bracket 311.

[0065] A fresh air cover plate 51 and a fresh air driving member 52 are provided at the fresh air outlet 13, and the fresh air driving member 52 can drive the fresh air cover plate 51 to open or close the fresh air outlet 13. Specifically, the fresh air driving member 52 can drive the fresh air cover plate 51 to rotate so as to open the fresh air outlet 13. An outlet air guide plate 6 and an outlet air guide driving member (not shown) are provided at the air outlet 12, and the outlet air guide driving member can drive the outlet air guide plate 6 to open or close the air outlet 12. An inlet air guide plate 7 and an inlet air guide driving member (not shown) are provided at the air inlet 11, and the inlet air guide driving member can drive the inlet air guide plate 7 to open or close the air inlet 11. In this embodiment, the inlet air guide plate is divided into two inlet air guide plate assemblies 70, and each inlet air guide plate assembly 70 includes one or more inlet air guide plates 7. There are two inlet air guide drive members and inlet air guide plate assemblies 70, one inlet air guide drive member and one inlet air guide plate assembly 70 open or close a part of the air inlet, and the other inlet air guide drive member and one inlet air guide plate assembly 70 open or close another part of the air inlet. The fresh air drive member 52, the outlet air guide drive member and the inlet air guide drive member can all use motors. The structure of the outlet air guide drive member driving the outlet air guide plate 6 and the structure of the inlet air guide drive member driving the inlet air guide plate 7 are both existing structures and will not be repeated here.

[0066] The air-conditioning indoor unit of this embodiment includes a single fresh air mode, a cooling mode, a heating mode, a down exhaust mode and a down exhaust mode.

[0067] See also Figures 6 to 9 The air supply control method of the air conditioner indoor unit of this embodiment includes: like Figure 6As shown, in the single-open fresh air mode, the fresh air driving member 52 drives the fresh air cover 51 to open the fresh air outlet 13, the outlet air guide driving member drives the outlet air guide plate 6 to open the air outlet 12, the inlet air guide driving member drives the inlet air guide plate 7 to close the air inlet 11, and the fan 3 rotates forward. In this mode, since there is no air inlet except the fresh air outlet 13 in the closed first cavity 14 and the second cavity 15, only air outlet, a strong negative pressure can be formed, and fresh air outside can be sucked into the room.

[0068] like Figure 7 As shown, in cooling mode or heating mode, when the fresh air mode is turned on at the same time, the fresh air cover 51 opens the fresh air port 13, the outlet air guide plate 6 opens the air outlet 12, the inlet air guide plate 7 only closes a part of the air inlet 11, and the fan 3 rotates forward. Preferably, the opened part of the air inlet 11 is located at the end of the air inlet 11 away from the fresh air port 13. Optionally, the inlet air guide plate 7 can also completely close the air inlet 11.

[0069] In cooling mode or heating mode, when the fresh air mode is turned on at the same time, when the air inlet 11 is completely closed, there is no air intake except the fresh air outlet 13 in the closed first cavity 14, and only air outlet is formed, which can form a strong negative pressure, and the fresh air outside can be sucked into the first cavity 14 of the air conditioner indoor unit, and the heat exchanger 2 performs heat exchange on the fresh air before blowing it into the room. However, since the size of the fresh air outlet 13 is small, the air inlet 11 is not opened, and the air intake at this time is all fresh air from the outside, the amount of fresh air inhaled will be small, and the heat exchange effect will be worse. In order to further increase the air volume, a part of the air inlet 11 can be opened, and a part of the indoor return air can be added for mixing and then sent to the room through the heat exchanger 2, so that the air supply volume can be guaranteed and the comfort can be improved. In addition, since the fresh air is sucked in by negative pressure, if the air inlet 11 is fully opened, the negative pressure in the sealed first cavity 14 will be reduced, the negative pressure for the fresh air will be reduced, and the effect of introducing the outdoor fresh air will be worse. Therefore, the present invention closes at least a part of the air inlet 11 to ensure the fresh air volume and improve the heat exchange effect. At the same time, the opened part of the air inlet 11 is located at the end of the air inlet 11 away from the fresh air outlet 13, so that the influence of the negative pressure at the fresh air outlet 13 can be minimized.

[0070] like Figure 8 As shown, in the lower exhaust mode, the fresh air cover 51 opens the fresh air port 13, the outlet air guide plate 6 opens the air outlet 12, the inlet air guide plate 7 closes the air inlet 11, and the fan 3 rotates in the opposite direction. In order to increase the air intake and improve the exhaust efficiency, the outlet air guide plate can be swung downward by a preset angle.

[0071] In the downward exhaust mode, by opening the fresh air inlet 13 and the air outlet 12 and closing the air inlet 11, at the same time, the fan 3 rotates in the opposite direction, and the strong positive pressure in the cavity of the air-conditioning casing 1 will force the dirty air in the lower part of the room to pass through the air outlet 12 and the fresh air inlet 13, and then be discharged to the outside through the fresh air duct 9.

[0072] like Fig. 9 As shown, in the upper exhaust mode, the fresh air cover 51 opens the fresh air port 13, the outlet air guide plate 6 closes the outlet port 12, the inlet air guide plate 7 closes a portion of the air inlet 11, and the fan 3 rotates in the reverse direction. The opened portion of the air inlet 11 is located at the end of the air inlet 11 away from the fresh air port 13, so as to avoid as much as possible that the return air entering the first cavity from the air inlet 11 is discharged from the position of the air inlet 11 close to the fresh air port 13, thereby affecting the ventilation.

[0073] In the upper exhaust mode, by opening the fresh air vent 13 and the air inlet 11 and closing the air outlet 12, at the same time, the fan 3 rotates in the opposite direction, and the strong positive pressure in the cavity of the air-conditioning casing 1 will force the dirty air in the upper part of the room to pass through the air inlet 11 and the fresh air vent 13, and then be discharged to the outside through the fresh air duct 9.

[0074] As can be seen from the above, the internal space of the air conditioner housing is divided into two cavities by the heat exchanger, and a fresh air outlet connected to the first cavity is opened on the rear wall of the air conditioner housing. In this way, when the air conditioner indoor unit is in the single fresh air mode, there is no air inlet except the fresh air outlet in the closed first cavity and the second cavity, and only air outlet is formed, so that the outdoor fresh air can be sucked into the room. Compared with the prior art, the fresh air and heat exchange air of the air conditioner indoor unit can be realized by the existing fan, without the need to set up a special fresh air fan and fresh air duct, simplifying the structure of the whole machine. At the same time, in the fresh air mode, the negative pressure inside the air conditioner housing is large, the fresh air volume is large and the noise is small, and the fresh air can be delivered in a large air volume.

[0075] Second embodiment of the air conditioner indoor unit: As an explanation of the second embodiment of the air conditioner indoor unit of the present invention, only the differences from the first embodiment of the air conditioner indoor unit described above will be explained below.

[0076] See also Fig.10 and Fig.11 The air conditioner indoor unit of this embodiment further includes an air duct housing 20, which is located in the second cavity 25. An air supply channel 201 is provided in the air duct housing 20, and a fan 230 and an air outlet 212 are respectively located at two ends of the air supply channel 201.

[0077] The end of the air supply channel 201 close to the fan 230 is provided with a movable baffle 28 and a baffle driving member (not shown). A gap 202 is formed at the closest point between the air duct housing 20 and the fan 230. The movable baffle 28 is arranged close to the gap 202. The baffle driving member can drive the movable baffle 28 to swing between the stop position and the retracted position. Fig.11 As shown, when located at the stop position, the movable baffle 28 extends from the air duct housing 20 toward the fan 230, and the distance h between the movable baffle 28 and the fan 230 is smaller than the width w of the gap 202; when located at the retracted position, the movable baffle 28 fits against the inner wall 203 of the air duct housing 20.

[0078] Typically, the width w of the gap 202 formed at the closest point between the air duct housing 20 and the fan 230 is in the range of 5 mm to 10 mm. The smaller the gap here, the more the wind guided by the fan 230 is intercepted, resulting in a larger air volume at the air outlet 212. The gap here is reduced by setting a movable baffle 28.

[0079] like Fig.12 As shown, in the single opening fresh air mode, the movable baffle 28 is in the stop position. In the single opening fresh air mode, due to the blocking of the airflow by the movable baffle 28, the positive pressure generated in the cavity is greater, and the fresh air effect is better. Fig.13 As shown, in the lower exhaust mode, the movable baffle 28 is in the stop position, as shown in FIG. Fig.14 As shown, in the upper exhaust mode, the movable baffle 28 is in the stop position. In the lower exhaust mode and the upper exhaust mode, due to the blocking of the airflow by the movable baffle 28, the positive pressure generated in the cavity is greater and the exhaust effect is better. In addition, in the cooling mode or the heating mode, the movable baffle 28 is in the retracted position.

[0080] The third embodiment of the air conditioner indoor unit: As an explanation of the third embodiment of the air conditioner indoor unit of the present invention, only the differences from the first embodiment of the air conditioner indoor unit described above will be explained below.

[0081] See also Fig.15 In this embodiment, the first air guide portion 3313 and the second air guide portion 3314 are bent in opposite directions, and the first air guide portions 3313 and the second air guide portions 3314 are alternately arranged in sequence along the circumference of the fan blade bracket 3311. When the crossflow fan blade 331 rotates counterclockwise, the A3 surface can shovel the wind, and when the crossflow fan blade 331 rotates clockwise, the A4 surface can shovel the wind.

[0082] The fourth embodiment of the air conditioner indoor unit: As an explanation of the fourth embodiment of the air conditioner indoor unit of the present invention, only the differences from the first embodiment of the air conditioner indoor unit described above will be explained below.

[0083] See also Fig.16 The first air guide portion 4313 in each air outlet blade 4312 is connected to the second air guide portion 4314 in the air outlet blade 4312 and arranged along the radial direction of the blade support 4311. When the crossflow blade 431 rotates counterclockwise, the A5 surface can shovel the wind, and when the crossflow blade 431 rotates clockwise, the A6 surface can shovel the wind.

[0084] The fifth embodiment of the air conditioner indoor unit: As an explanation of the fifth embodiment of the air conditioner indoor unit of the present invention, only the differences from the first embodiment of the air conditioner indoor unit described above will be explained below.

[0085] See also Figures 17 to 19 In this embodiment, the cross-flow fan blade 531 includes an end cover 532, a middle-section fan blade 533 and a shaft cover 534. The middle-section fan blade 533 includes a first fan blade segment 5331 and a second fan blade segment 5332. The number of the first fan blade segment 5331 and the second fan blade segment 5332 is more than two, and the first fan blade segment 5331 and the second fan blade segment 5332 are alternately arranged along the axial direction of the cross-flow fan blade 531.

[0086] The fan blade support 5310 includes a first support plate 5311 and a second support plate 5312. Each first fan blade segment 5331 includes a first support plate 5311 and a plurality of first air guides 5313. The first air guides 5313 are arranged at intervals along the circumference of the first support plate 5311. Each second fan blade segment 5332 includes a second support plate 5312 and a plurality of second air guides 5314. The second air guides 5314 are arranged at intervals along the circumference of the second support plate 5312. The first air guides 5313 and the second air guides 5314 are bent in opposite directions. The first fan blade segment 5331 and the second fan blade segment 5332 are arranged along the axial direction of the fan blade support 5310.

[0087] In other embodiments, the number of at least one of the first wind blade segment 5331 and the second wind blade segment 5332 may also be set to be more than two.

[0088] It can be seen that the first blade segment and the second blade segment are alternately arranged along the axial direction of the blade support, so that a good air supply effect can be produced regardless of whether the crossflow blade rotates forward or reversely, ensuring a uniform air supply effect in the axial direction of the crossflow blade.

[0089] In addition, the first cavity and the second cavity may also be connected only through the gap between the fins of the heat exchanger. The free end of the third heat exchange section may also be adjacent to the front wall of the air conditioner housing. The wind guide blade group may also only include arc-shaped blades with a single curvature, each blade is bent in the same direction, and each blade can rotate relative to the blade support. When the fan needs to rotate in the opposite direction, each blade rotates 180 degrees with the midpoint of its own length direction as the center. The above changes can also achieve the purpose of the present invention.

[0090] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Air conditioner indoor unit, including air conditioner housing, heat exchanger and fan; An air inlet is provided at the top of the air conditioner housing, an air outlet is provided at the bottom of the air conditioner housing, and the air outlet is located on the front wall of the air conditioner housing; The heat exchanger and the fan are both located in the air conditioner housing, and the fan is arranged close to the heat exchanger; Features: The heat exchanger divides the inner space of the air conditioner housing into a first cavity and a second cavity, and the first cavity and the second cavity are connected through the gap between the fins of the heat exchanger; A fresh air outlet is provided on the rear wall of the air conditioner housing, and the air inlet and the fresh air outlet are directly connected to the first cavity; The air outlet is directly connected to the second cavity; The air conditioner indoor unit includes a fresh air only mode. In the fresh air only mode, the fresh air inlet and the air outlet are both opened, and the air inlet is closed.

2. The air conditioner indoor unit according to claim 1, characterized in that: The fan comprises a blade driving member and a crossflow blade, and the blade driving member can drive the crossflow blade to rotate forward or reverse; The crossflow fan blade comprises a fan blade support and a wind guide blade group connected to each other; The wind guide blade group includes a first wind guide portion and a second wind guide portion. The first wind guide portion is used to generate an airflow blowing out in a first direction when the cross-flow blade rotates forward, and the second wind guide portion is used to generate an airflow blowing out in a second direction when the cross-flow blade rotates reversely.

3. The air conditioner indoor unit according to claim 2, characterized in that: The wind guide blade group includes a plurality of wind outlet blades arranged at intervals along the circumference of the wind blade support, and each of the wind outlet blades includes a first wind guide portion and a second wind guide portion, and the first wind guide portion and the second wind guide portion are bent in opposite directions.

4. The air conditioner indoor unit according to claim 3, characterized in that: Each of the first air guide portions and its corresponding second air guide portion are gradually separated from each other from an end close to the central axis of the fan blade support to an end far away from the central axis of the fan blade support.

5. The air conditioner indoor unit according to claim 4, characterized in that: Each of the first air guide portions is connected to an end of its corresponding second air guide portion close to the central axis of the fan blade support.

6. The air conditioner indoor unit according to claim 3, characterized in that: The first air guide portion in each of the air outlet blades is connected to the second air guide portion in the air outlet blade and is arranged along the radial direction of the blade support.

7. The air conditioner indoor unit according to claim 2, characterized in that: The fan blade support includes a first support plate and a second support plate; There are a plurality of first air guide portions, each of which is arranged at intervals along the circumference of the first bracket plate, and the first air guide portions and the first bracket plate form a first wind blade segment; There are a plurality of second air guide portions, each of which is arranged at intervals along the circumference of the second bracket plate, and the second air guide portions and the second bracket plate form a second wind blade segment; The first air guiding portion and the second air guiding portion are bent in opposite directions; The first fan blade segment and the second fan blade segment are arranged along the axial direction of the fan blade support.

8. The air conditioner indoor unit according to claim 7, characterized in that: The number of at least one of the first fan blade segments and the second fan blade segments is more than two, and the first fan blade segments and the second fan blade segments are alternately arranged along the axial direction of the fan blade support.

9. The air conditioner indoor unit according to any one of claims 2 to 8, characterized in that: A fresh air cover and a fresh air driving member are provided at the fresh air outlet, and the fresh air driving member can drive the fresh air cover to open or close the fresh air outlet; The air outlet is provided with an outlet air guide plate and an outlet air guide driving member, and the outlet air guide driving member can drive the outlet air guide plate to open or close the air outlet; An inlet air guide plate and an inlet air guide driving member are provided at the air inlet, and the inlet air guide driving member can drive the inlet air guide plate to open or close the air inlet.

10. The air conditioner indoor unit according to claim 9, characterized in that: In the single-opening fresh air mode, the fresh air cover opens the fresh air outlet, the outlet air guide plate opens the air outlet, the inlet air guide plate closes the air inlet, and the fan rotates in the forward direction.

11. The air conditioner indoor unit according to claim 9, characterized in that: The air conditioner indoor unit includes a cooling mode or a heating mode. In the cooling mode or the heating mode, when the fresh air mode is turned on at the same time, the fresh air cover opens the fresh air outlet, the outlet air guide plate opens the air outlet, the inlet air guide plate closes at least a part of the air inlet, and the fan rotates in the forward direction.

12. The air conditioner indoor unit according to claim 11, characterized in that: When the inlet air guide plate only closes a portion of the air inlet, the opened portion of the air inlet is located at an end of the air inlet away from the fresh air outlet.

13. The air conditioner indoor unit according to claim 9, characterized in that: The air conditioner indoor unit includes a downward exhaust mode, in which the fresh air cover opens the fresh air outlet, the outlet air guide plate opens the air outlet, the inlet air guide plate closes the air inlet, and the fan rotates in the reverse direction; and / or The air conditioner indoor unit includes an upper exhaust mode. In the upper exhaust mode, the fresh air cover opens the fresh air outlet, the outlet air guide plate closes the air outlet, the inlet air guide plate closes a part of the air inlet, and the fan rotates in the reverse direction.

14. The air conditioner indoor unit according to any one of claims 1 to 8, characterized in that: The air conditioner indoor unit further comprises an air duct housing, the air duct housing is located in the second cavity, an air supply channel is provided in the air duct housing, and the fan and the air outlet are respectively located at two ends of the air supply channel; A movable baffle is provided at one end of the air supply channel close to the fan, a gap is formed at the closest distance between the air duct housing and the fan, the movable baffle is provided close to the gap, and the movable baffle can be switched between a stop position and a retracted position; When located at the stop position, the movable baffle extends from the air duct housing toward the fan, and the distance between the movable baffle and the fan is smaller than the width of the gap; When located at the retracted position, the movable baffle is in contact with the inner wall of the air duct housing.

15. The air conditioner indoor unit according to claim 14, characterized in that: The air conditioner indoor unit includes a fresh air only mode, in which the movable baffle is in the stop position; and / or The air conditioner indoor unit includes a downward exhaust mode, in which the movable baffle is in the stop position; and / or The air conditioner indoor unit includes an upper exhaust mode, in which the movable baffle is in the stop position; and / or The air conditioner indoor unit includes a cooling mode or a heating mode. In the cooling mode or the heating mode, the movable baffle is in the retracted position.

16. A method for controlling air supply of an indoor unit of an air conditioner, characterized in that: Applicable to an air conditioner indoor unit according to any one of claims 1 to 15; The air supply control method comprises: In the fresh air only mode, the fresh air inlet and the air outlet are opened, and the air inlet is closed.

17. An air conditioner, characterized in that It comprises an air-conditioning outdoor unit and an air-conditioning indoor unit as claimed in any one of claims 1 to 15 which are connected to each other.

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