Air conditioner indoor unit

Abstract

The present invention proposes an air conditioner indoor unit, which belongs to the technical field of air conditioners. The air conditioner indoor unit includes a casing, including an air inlet formed on the side of the casing, and an air outlet formed on the bottom of the casing; a heat exchanger is arranged in the casing corresponding to the air inlet, and is used for heat exchange with the air from the air inlet; a centripetal fan is arranged in the center of the heat exchanger; and a diagonal flow fan is arranged below the centripetal fan; the centripetal fan inhales air from the radial direction and discharges it axially to the diagonal flow fan, and the diagonal flow fan blows the air out diagonally downward. The air conditioner indoor unit is provided with a centripetal fan upstream of the diagonal flow fan, which can fit the structure of the flow channel, effectively improve the inlet airflow state of the diagonal flow fan, so that the diagonal flow fan can play the greatest role and can be well applied to various scenarios.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioners, and in particular relates to an air conditioner indoor unit. Background Art

[0002] In the related art, the fans of indoor units of air conditioners are mainly axial flow fans and centrifugal fans. Axial flow fans have large air volume but insufficient air pressure; centrifugal fans have high air pressure but insufficient air volume. Diagonal flow fans allow air to move both centrifugally and axially. The radial component and axial component of the fluid velocity are of the same order of magnitude. The airflow pattern generated is similar to the combination of axial and centrifugal patterns. The wind pressure coefficient is higher than that of axial flow fans, and the flow coefficient is larger than that of centrifugal fans. At the same time, the operating range is wide, which is suitable for occasions with moderate wind pressure and flow.

[0003] However, the diagonal flow fan has a large axial dimension and has high requirements on the state of the inlet airflow, so its application scenarios are highly restricted. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an air conditioner indoor unit is proposed, in which a centripetal fan is arranged upstream of a diagonal flow fan, which can fit the structure of the flow channel and effectively improve the inlet airflow state of the diagonal flow fan, so that the diagonal flow fan can play the greatest role and can be well applied to various scenarios.

[0005] According to an embodiment of the present disclosure, an air-conditioning indoor unit includes: a casing, including an air inlet formed on a side of the casing, and an air outlet formed on a bottom surface of the casing; a heat exchanger, arranged in the casing corresponding to the air inlet, for exchanging heat with the air from the air inlet; a centripetal fan, arranged in the center of the heat exchanger; and a diagonal flow fan, arranged below the centripetal fan; the centripetal fan draws air radially and discharges it axially toward the diagonal flow fan, and the diagonal flow fan blows the air out diagonally downward.

[0006] According to the air-conditioning indoor unit disclosed in the present invention, two-stage fans are arranged in series, the first-stage fan is a centripetal fan, and the second-stage fan is a diagonal flow fan. The airflow is sucked in from the air inlet by the first-stage centripetal fan, enters the second-stage diagonal flow fan axially after the centripetal fan does work, and is discharged diagonally downward after the diagonal flow fan does further work. The front centripetal fan can perfectly fit the structure of the flow channel, effectively improve the inlet airflow condition of the diagonal flow fan, and maximize the role of the diagonal flow fan. At the same time, the diagonal flow fan has the characteristics of high static pressure and large flow, which can make up for the disadvantage of insufficient pressure rise of the axial flow fan, and has obvious advantages in air volume compared with the centrifugal fan, effectively improving the efficiency of the fan in the air-conditioning indoor unit.

[0007] According to an embodiment of the present disclosure, the centripetal fan and the diagonal flow fan have opposite rotation directions and unequal rotation speeds.

[0008] According to an embodiment of the present disclosure, in the direction of the rotation axis, the blade height of the diagonal flow fan is greater than the blade height of the centripetal fan.

[0009] According to an embodiment of the present disclosure, the inlet outer diameter of the diagonal flow fan is not larger than the outer diameter of the centripetal fan.

[0010] According to an embodiment of the present disclosure, in the entire air flow direction, the air flow turning angle is 120° to 150°.

[0011] According to an embodiment of the present disclosure, the centripetal fan includes a front hub; and front blades, which are distributed in a twisted manner along the front hub from the leading edge of the blade to the trailing edge of the blade.

[0012] According to an embodiment of the present disclosure, the diagonal flow fan includes a rear hub that is roughly truncated cone-shaped, with the large diameter end of the rear hub facing downward, and the angle between the generatrix of the rear hub and the axis is 39 to 51 degrees.

[0013] According to an embodiment of the present disclosure, the diagonal flow fan also includes rear blades, which are distributed in a twisted manner along the surface of the rear hub, and the leading edge and the trailing edge of the rear blades are both inclined forward toward the air flow inlet direction; the projections of the blade top and the blade root of the rear blade on the rear hub intersect in an X shape.

[0014] According to an embodiment of the present disclosure, the casing includes: a casing, which is provided to cover the outside of the heat exchanger, and an air inlet is formed on the peripheral side of the casing; a collector, which is provided below the casing and is located between the centripetal fan and the diagonal flow fan; a wheel cover, which is provided to surround the outside of the diagonal flow fan and is connected to the bottom of the collector, and the cross-section of the wheel cover gradually increases from top to bottom; and a panel, which is connected to the bottom of the wheel cover, and a grille-type air outlet is formed on the panel.

[0015] According to an embodiment of the present disclosure, the current collector is substantially in a circular ring shape.

[0016] According to an embodiment of the present disclosure, the centripetal fan includes a front motor connected to the center of the casing; the diagonal flow fan includes a rear motor connected to the center of the panel, and the motor shaft of the front motor and the motor shaft of the rear motor are coaxially connected through a coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a three-dimensional diagram of an indoor unit of an air conditioner according to an embodiment of the present disclosure;

[0019] Figure 2 is a cross-sectional view showing the airflow direction of an indoor unit of an air conditioner according to an embodiment of the present disclosure;

[0020] Figure 3 is a cross-sectional view of an indoor unit of an air conditioner according to an embodiment of the present disclosure;

[0021] Figure 4 is a three-dimensional diagram of a centripetal fan of an indoor unit of an air conditioner according to an embodiment of the present disclosure;

[0022] Figure 5 is a perspective view of a diagonal flow fan of an indoor unit of an air conditioner according to an embodiment of the present disclosure;

[0023] In the above figures: 10, casing; 11, casing; 111, first raised portion; 12, collector; 13, wheel cover; 14, panel; 141, second raised portion; 101, air inlet; 102, air outlet; 103, air flow channel; 20, heat exchanger; 30, centrifugal fan; 31, front motor; 32, front wheel hub; 33, front blades; 40, oblique flow fan; 41, rear motor; 42, rear wheel hub; 43, rear blades; 51, first adjusting member; 52, second adjusting member. DETAILED DESCRIPTION

[0024] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0025] To facilitate understanding of the present invention, the following terms are explained:

[0026] Airfoil: In aerodynamics, an airfoil is usually understood as the two-dimensional cross-section of a blade. Generally, the front end of the airfoil is smooth and the rear end is sharp.

[0027] Airfoil centerline: Draw a series of inscribed circles between the upper and lower surfaces of the airfoil. The trajectory formed by the centers of these inscribed circles is called the centerline of the airfoil.

[0028] Trailing edge of blade: The rear tip of the airfoil is called the trailing edge of the blade.

[0029] Blade leading edge: Opposite to the blade trailing edge, the point on the airfoil farthest from the blade trailing edge is called the blade leading edge.

[0030] Blade root: The part of the blade that contacts the hub is called the blade root.

[0031] Blade tip: The side of the blade away from the hub is called the blade tip.

[0032] Inlet angle: The angle between the tangent line of the airfoil centerline at the leading edge of the airfoil and the direction of rotation of the blade.

[0033] Exit angle: The angle between the tangent line of the airfoil centerline at the trailing edge of the airfoil and the direction of blade rotation.

[0034] Airflow turning angle: the difference between the outlet angle and the inlet angle.

[0035] Installation angle: the angle between the line connecting the leading and trailing edges of the airfoil and the direction of rotation of the blade.

[0036] The air-conditioning indoor unit of the disclosed embodiment is suitable for ceiling-mounted air-conditioning.

[0037] Figure 1 is a three-dimensional diagram of an indoor unit of an air conditioner according to an embodiment of the present disclosure, Figure 2 4 is a cross-sectional view illustrating the air flow direction of an indoor unit of an air conditioner according to an embodiment of the present disclosure.

[0038] Reference Figure 1 , Figure 2 , Figure 2 The arrow in the middle indicates the direction of air flow.

[0039] The air conditioner indoor unit includes: a casing 10 , a heat exchanger 20 , a centripetal fan 30 and a diagonal flow fan 40 .

[0040] The casing 10 forms the main appearance of the indoor unit of the air conditioner, and an air inlet 101 is formed in the circumferential direction of the side of the casing 10, and an air outlet 102 is formed on the bottom surface of the casing 10. Taking a ceiling-mounted air conditioner as an example, the top surface of the indoor unit of the air conditioner is installed on the ceiling, and the air flow enters from the side air inlet 101 of the casing 10 and is blown out from the air outlet 102 to improve the indoor environment temperature.

[0041] The heat exchanger 20 is installed in the housing 10 and surrounds the inner side of the air inlet 101 . The air entering from the air inlet 101 flows through the heat exchanger 20 and exchanges heat with the heat exchanger 20 .

[0042] The centripetal fan 30 is disposed at the center of the heat exchanger 20. The centripetal fan 30 gathers the surrounding air to the center and discharges it downward. The centripetal fan 30 converts the radial airflow into an axial airflow.

[0043] The diagonal flow fan 40 is located between the centripetal fan 30 and the air outlet 102 , and the diagonal flow fan 40 sends the airflow flowing out of the centripetal fan 30 diagonally downward to the air outlet 102 for discharge.

[0044] According to the air conditioner indoor unit disclosed in the present invention, a two-stage fan structure is adopted, in which the first-stage fan is a centripetal fan 30, and the second-stage fan is a diagonal flow fan 40. When the fan is started, the air flow is radially sucked in from the air inlet 101 by the first-stage centripetal fan 32, and enters the second-stage diagonal flow fan 40 axially after the centripetal fan 32 does work, and is discharged from the air outlet 102 after the diagonal flow fan 40 further does work. The entire flow direction of the airflow changes from a horizontal direction to an inclined direction on the entire cross-section, and the combination of the two-stage fans perfectly matches the flow direction of the airflow.

[0045] The diagonal flow fan 40 has the characteristics of high wind pressure and large flow, which can make up for the shortcoming of insufficient wind pressure of the axial flow fan, and has obvious advantages in air volume compared with the centrifugal fan; and the front centrifugal fan 30 can perfectly fit the structure of the flow channel, effectively improving the inlet airflow condition of the diagonal flow fan 40, so that the function of the diagonal flow fan 40 can be maximized.

[0046] In addition, the centripetal fan 30 radially draws in airflow, thereby avoiding the problem in the related art that part of the incoming airflow is directed obliquely upward to impact the ceiling; the oblique flow fan 40 supplies air obliquely downward to avoid direct blowing of the airflow.

[0047] In order to ensure that the airflow can flow from the centripetal fan 30 to the diagonal flow fan 40, the centripetal fan 30 and the diagonal flow fan 40 are set to rotate in opposite directions and have unequal speeds; at the same time, the combined effect of the two-stage fans greatly increases the air volume of the air conditioner indoor unit.

[0048] Figure 3 is a cross-sectional view of an air conditioner indoor unit according to an embodiment of the present disclosure.

[0049] Reference Figure 3 The inner space of the casing 10 forms an air flow channel 103 connecting the air inlet 101 and the air outlet 102 ; the casing 10 specifically includes a casing 11 , a collector 12 , a wheel cover 13 and a panel 14 .

[0050] In the current embodiment, the cross section of the enclosure 11 is approximately rectangular, however, the present disclosure is not limited thereto, and the enclosure 11 may also be circular or other special shapes.

[0051] The side periphery of the enclosure 11 is provided with air inlets 101 formed by lattices, so that wind from four directions around the enclosure 11 can enter the air conditioner, thereby increasing the air inlet area; the heat exchanger 20 is arranged roughly around the air inlet 101, which can ensure heat exchange for all air entering the air conditioner, thereby improving the heat exchange efficiency of the air conditioner.

[0052] The collector 12 is substantially in the shape of a circular ring and is located between the centripetal fan 30 and the diagonal flow fan 40 in the height direction, and is used for collecting wind from the air inlet 101 and flowing toward the wheel cover 13 .

[0053] The wheel cover 13 surrounds the outside of the diagonal flow fan 40. From top to bottom, the cross section of the wheel cover 13 gradually increases, and is generally conical or trumpet-shaped. There is a spacing of 4 to 12 mm between the wheel cover 13 and the diagonal flow fan 40, which can prevent the diagonal flow fan 40 from touching the wheel cover 13 while reducing the volume of the wheel cover 13 as much as possible.

[0054] The panel 14 is connected to the bottom end of the wheel cover 13 to close the lower end surface of the wheel cover 13 , and an air outlet 102 formed by a grille is provided on the panel 14 .

[0055] The centripetal fan 30 and the diagonal flow fan 40 are located in the center of the casing 10 .

[0056] The centripetal fan 30 includes a front motor 31, a front hub 32 and front blades 33; the front motor 31 is located in the front hub 32 and is fixedly installed at the top center of the casing 11, the motor shaft of the front motor 31 is connected to the front hub 32, and the front motor 31 drives the front hub 32 to drive the front blades 33 to rotate.

[0057] The diagonal flow fan 40 includes a rear motor 41, a rear hub 42 and rear blades 43; the rear motor 41 is located in the rear hub 42 and is fixedly installed at the center of the upper end of the panel 14, the motor shaft of the rear motor 41 is connected to the rear hub 42, and the rear motor 41 drives the rear hub 42 to drive the rear blades 43 to rotate.

[0058] The motor shafts of the front motor 31 and the rear motor 41 are coaxially connected via a coupling.

[0059] The front hub 32 is cylindrical, and the front blades 33 are attached to the front hub 32; the rear hub 42 is truncated cone-shaped, and the small diameter end of the rear hub 42 faces upward and the large diameter end faces downward.

[0060] In some embodiments, a first protrusion 111 extends downward from the top of the casing 11, and the front motor 31 is installed on the first protrusion 111 through a first adjusting member 51; a second protrusion 141 extends upward from the panel 14, and the rear motor 41 is installed on the second protrusion 141 through a second adjusting member 52.

[0061] In some embodiments, in the direction of the rotation axis, the height of the rear blade 43 of the diagonal flow fan 40 is greater than the height of the front blade 33 of the centripetal fan 30. Since in the air-conditioning indoor unit, the centripetal fan 30 is mainly used to adjust the direction of the inlet air flow flowing to the diagonal flow fan 40, the centripetal fan 30 can be set to be thinner in the axial direction, so that the height dimension of the air-conditioning indoor unit can be reduced as much as possible without affecting its function; and setting the diagonal flow fan 40 thicker can give full play to its axial air supply high static pressure and large flow characteristics, to ensure the wind pressure and air volume of the air-conditioning indoor unit, and increase the air volume and air supply distance of the air-conditioning indoor unit.

[0062] In some embodiments, the inlet outer diameter of the diagonal flow fan 40 is not larger than the outer diameter of the centripetal fan 30. Since the centripetal fan 30 is located upstream of the diagonal flow fan 40, the inlet outer diameter of the diagonal flow fan 40 is set to be smaller than that of the centripetal fan 30. This can ensure that the airflow discharged from the centripetal fan 30 all flows to the diagonal flow fan 40, thereby avoiding the situation where part of the airflow flows directly to the diagonal flow fan 40 without passing through the centripetal fan 30, resulting in a poor airflow inlet angle, thereby affecting the function of the diagonal flow fan 40.

[0063] Figure 4 is a three-dimensional diagram of a centrifugal fan of an indoor unit of an air conditioner according to an embodiment of the present disclosure, Figure 5 It is a three-dimensional view of a diagonal flow fan of an air conditioner indoor unit according to an embodiment of the present disclosure.

[0064] Reference Figure 4 , Figure 5 The number of front blades 33 of the centripetal fan 30 is 7 to 13, with 11 examples shown in the figure. The height of the front blades 33 along the rotation axis is 65 to 100 mm, and the outer diameter of the centripetal fan 30 is 240 to 300 mm.

[0065] The number of rear blades 44 of the diagonal flow fan 40 is 6 to 9, with 7 examples shown in the figure. The height of the rear blades 43 along the direction of the rotation axis is 120 to 180 mm, the inlet outer diameter of the diagonal flow fan 40 is 160 to 240 mm, the outlet outer diameter is 200 to 300 mm, and the angle between the generatrix of the rear hub 42 and the axis is 39 to 51°.

[0066] In some embodiments, the front blades 33 and the rear blades 43 are twisted, which can effectively improve the efficiency of the fan.

[0067] Specifically, the front blades 33 are distributed in a twisted manner along the surface of the front hub 32 from the leading edge of the blade to the trailing edge of the blade.

[0068] The rear blades 43 are twistedly distributed along the rear hub 42 surface from the leading edge to the trailing edge of the blades, and both the leading edge and the trailing edge of the blades are inclined forward toward the airflow inlet direction, and the projections of the blade top and the blade root on the rear hub surface 42 intersect in an X shape.

[0069] The tip inlet angle of the rear blade 43 is 32-42°, the outlet angle is 25-33°, and the blade installation angle is 29-37°; the root inlet angle is 52-64°, the outlet angle is 46-54°, ​​and the blade installation angle is 56-66°. The leading edge of the blade is inclined forward toward the inlet direction, and the angle between the leading edge of the blade and the axis Z is 6-18°; the trailing edge of the blade is also inclined forward toward the inlet direction, and the angle between the trailing edge of the blade and the axis Z is 5-15°.

[0070] In the airflow direction of the two-stage fan, the airflow turning angle is 120°~150°. In the current embodiment, the airflow turning angle is 135°, which is consistent with the structure of the airflow channel 103 and ensures the requirements of radial air inlet and oblique downward air outlet.

[0071] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0072] 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 the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0073] 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.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air conditioner indoor unit, characterized in that: include: A casing, comprising an air inlet formed on a side surface of the casing, and an air outlet formed on a bottom surface of the casing; a heat exchanger, disposed in the housing corresponding to the air inlet, for performing heat exchange with the air from the air inlet; A centripetal fan is arranged in the center of the heat exchanger; as well as The oblique flow fan is arranged below the centripetal fan, and the oblique flow fan comprises a rear hub, which is in a frustum shape, with a small diameter end facing upward and a large diameter end facing downward; The centripetal fan inhales air radially and discharges the air axially toward the diagonal flow fan, and the diagonal flow fan blows the air obliquely downward.

2. The air conditioner indoor unit according to claim 1, characterized in that: The centripetal fan and the diagonal flow fan rotate in opposite directions and have unequal rotation speeds.

3. The air conditioner indoor unit according to claim 1, characterized in that: In the direction of the rotation axis, the blade height of the diagonal flow fan is greater than the blade height of the centripetal fan.

4. The air conditioner indoor unit according to claim 1, characterized in that: The inlet outer diameter of the diagonal flow fan is not greater than the outer diameter of the centripetal fan.

5. The air conditioner indoor unit according to claim 1, characterized in that: In the entire air flow direction, the air flow turning angle is 120°~150°.

6. The air conditioner indoor unit according to claim 1, characterized in that: The centripetal fan comprises: front wheel hub; and The front blades are distributed in a twisted manner along the front hub from the leading edge of the blades to the trailing edge of the blades.

7. The air conditioner indoor unit according to claim 1, characterized in that: The included angle between the generatrix of the rear wheel hub and the axis is 39-51°.

8. The air conditioner indoor unit according to claim 7, characterized in that: The diagonal flow fan also includes: The rear blades are twistedly distributed along the surface of the rear hub, and the leading edge and the trailing edge of the rear blades are both inclined forward toward the airflow inlet direction; the projections of the blade top and the blade root of the rear blade on the rear hub intersect in an X shape.

9. The air conditioner indoor unit according to claim 1, characterized in that: The housing comprises: A casing, which is arranged to cover the outside of the heat exchanger, and the air inlet is arranged on the side periphery of the casing; A collector, connected to the lower part of the enclosure and located between the centripetal fan and the diagonal flow fan; A wheel cover, which is arranged around the outside of the diagonal flow fan and connected to the bottom of the collector, and the cross section of the wheel cover gradually increases from top to bottom; and A panel is connected to the bottom of the wheel cover, and the air outlet is arranged on the panel.

10. The air conditioner indoor unit according to claim 9, characterized in that: The centripetal fan includes a front motor connected to the center of the casing; the diagonal flow fan includes a rear motor connected to the center of the panel, and the motor shaft of the front motor and the motor shaft of the rear motor are coaxially connected through a coupling.

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