Air conditioner

Abstract

The invention provides an air conditioner which comprises a first air duct and a first cross-flow fan blade arranged at an inlet of the first air duct, the first cross-flow fan blade is provided with a first axis, any point O1 is arranged on the first axis, and a straight line which passes through the point O1 and is perpendicular to the first axis is a first horizontal line; a ray which passes through the point O1 and is perpendicular to the first horizontal line and the first axis is a first ray, the first ray extends towards the side where an inlet of the first air channel is located, the plane where the first ray and the first horizontal line are located is a first plane, the first air channel is provided with a first air channel bottom shell, and the first plane and the tail end of the inner surface of the first air channel bottom shell intersect at a point X1; the angle formed between the line segment O1X1 and the first ray is theta 1, the outer diameter of the first cross-flow fan blade is R1, and theta 1 = 1.13 * 10 < 2 >-0.468 R1 + 9.58 * 10 < 3 > * R < 12 >. According to the air conditioner, when the formula is met, the air flow of the air conditioner flows smoothly, the air volume can be maximized, the air supply distance can be increased, and the better indoor temperature rising and falling effect can be achieved.

Description

Technical Field

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

[0002] As people's living standards improve, they have higher requirements for the comfort of their living environment. For double cross-flow fan air conditioners, due to their unique double-sided air outlet, they can achieve wall-mounted air supply, which can better achieve "cold air does not blow on people" compared to traditional front-outlet air conditioners. However, how to achieve "cold air does not blow on people" while also achieving a long air supply distance to achieve better indoor temperature rise and temperature drop effects is a difficult problem for double cross-flow fan air conditioners. Summary of the invention

[0003] Therefore, the present invention provides an air conditioner that can solve the technical problem that the air supply distance of the double cross-flow fan air conditioner is not long enough to achieve a better temperature rise and fall effect indoors.

[0004] In order to solve the above problems, the present invention provides an air conditioner, comprising a first crossflow fan blade and a first air duct, wherein the first crossflow fan blade is arranged at the entrance of the first air duct, the first crossflow fan blade has a first axis, and the first axis has an arbitrary point O1, a straight line passing through the point O1 and perpendicular to the first axis is a first horizontal line, a ray passing through the point O1 and perpendicular to the first horizontal line and the first axis is a first ray, the first ray extends along the radial direction of the first crossflow fan blade and extends out of the entrance of the first air duct, the plane where the first ray and the first horizontal line are located is a first plane, the first air duct has a first air duct bottom shell, the first plane intersects with the end of the inner surface of the first air duct bottom shell at a point X1, the angle formed between the line segment O1X1 and the first ray is θ1, the outer diameter of the first crossflow fan blade is R1, θ1=1.13*10 2 -0.468R1+9.58*10 -3 *R1 2 .

[0005] In some embodiments, the first horizontal line intersects with the inner surface of the first air duct bottom shell at point A1, and the first horizontal line intersects with the outer edge of the first crossflow fan blade at point B1, and the point B1 is located between the point A1 and the point O1, and the length of the line segment A1B1 is h1, h1=-2.08*10 2 +4.36R1-2.15*10 -2 *R1 2 .

[0006] In some embodiments, the air conditioner further comprises a second crossflow blade and a second air duct, the second crossflow blade being arranged at the entrance of the second air duct, the second crossflow blade having a second axis, the second axis having an arbitrary point O2, the straight line passing through the point O2 and being perpendicular to the second axis being a second horizontal line, the ray passing through the point O2 and being perpendicular to the second horizontal line and the second axis being a second ray, the second ray extending along the radial direction of the second crossflow blade and extending out of the entrance of the second air duct, the plane in which the second ray and the second horizontal line are located together being a second plane, the second air duct having a second air duct bottom shell, the second plane intersecting with the end of the inner surface of the second air duct bottom shell at point X2, the angle formed between the line segment O2X2 and the second ray being θ2, the outer diameter of the second crossflow blade being R2, θ2=1.13*10 2 -0.468R2+9.58*10 -3 *R2 2 .

[0007] In some embodiments, the second horizontal line intersects the inner surface of the second air duct bottom shell at point A2, and the second horizontal line intersects the outer edge of the second crossflow fan blade at point B2, and the point B2 is located between the point A2 and the point O2, and the length of the line segment A2B2 is h2, h2=-2.08*10 2 +4.36R2-2.15*10 -2 *R2 2 .

[0008] In some embodiments, the first cross-flow blades and the second cross-flow blades are symmetrically distributed, and the first air duct and the second air duct are also symmetrically distributed.

[0009] In some embodiments, the air conditioner further includes an indoor heat exchanger, and the indoor heat exchanger is located in the negative pressure area of ​​the first cross flow blade and the second cross flow blade at the same time.

[0010] In some embodiments, the negative pressure area of ​​the first crossflow blade is further provided with a first electric heating device.

[0011] In some embodiments, the first electric heating device is located between the indoor heat exchanger and the first crossflow blade.

[0012] In some embodiments, the negative pressure area of ​​the second crossflow blade is further provided with a second electric heating device.

[0013] In some embodiments, the second electric heating device is located between the indoor heat exchanger and the second crossflow blade.

[0014] The present invention provides an air conditioner, which has the following beneficial effects:

[0015] When the outer diameter of the first cross flow blade and the relative position relationship between the first cross flow blade and the first air duct satisfy: θ1 = 1.13*10 2 -0.468R1+9.58*10 -3 *R1 2 When the airflow in the first air duct is turned on, it can maximize the air volume of the air conditioner, increase the air supply distance of the air conditioner, and achieve better temperature rise and drop effects indoors, thereby improving the indoor comfort of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] Figure 1 A simplified top view of the air duct of the air conditioner according to the embodiment of the present invention when the angles thereof change with respect to the crossflow blades;

[0018] Figure 2 A simplified top view of the air duct of the air conditioner according to the embodiment of the present invention when the air duct is at an optimal angle relative to the crossflow blades;

[0019] Figure 3 A simplified top view of an air conditioner according to an embodiment of the present invention;

[0020] Figure 4 A top view of an air conditioner according to an embodiment of the present invention;

[0021] Figure 5 A front view of an air conditioner according to an embodiment of the present invention;

[0022] Figure 6 It is a simulation schematic diagram of the air volume and the different angle changes of the air duct relative to the cross-flow fan blade when the outer diameter of the cross-flow fan blade of the air conditioner according to the embodiment of the present invention is 90.4 mm;

[0023] Figure 7 It is a simulation schematic diagram of the suction angle and air volume of the cross-flow fan blade when the outer diameter of the cross-flow fan blade of the air conditioner according to the embodiment of the present invention is 90.4 mm;

[0024] Figure 8 It is a simulation schematic diagram of the depth of the bottom shell of the air duct and the air volume when the outer diameter of the cross-flow fan blade of the air conditioner according to the embodiment of the present invention is 90.4 mm.

[0025] The reference numerals are:

[0026] 1. First crossflow fan blade; 2. First air duct; 3. First air duct bottom shell; 4. Second crossflow fan blade; 5. Second air duct; 6. Second air duct bottom shell; 7. Indoor heat exchanger; 8. First electric heating device; 9. Second electric heating device; 10. First volute tongue; 11. Second volute tongue; 12. First volute throat; 13. Second volute throat; 14. First air outlet; 15. Second air outlet. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0029] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0030] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0031] See also Figures 1 to 8 As shown, according to an embodiment of the present invention, an air conditioner is provided, comprising a first crossflow fan blade 1 and a first air duct 2, the first crossflow fan blade 1 is arranged at the entrance of the first air duct 2, the first crossflow fan blade 1 has a first axis, the first axis has an arbitrary point O1, a straight line passing through the point O1 and perpendicular to the first axis is a first horizontal line, a ray passing through the point O1 and perpendicular to the first horizontal line and the first axis is a first ray, the first ray extends along the radial direction of the first crossflow fan blade 1 and extends out of the entrance of the first air duct 2, the plane where the first ray and the first horizontal line are located is a first plane, the first air duct 2 has a first air duct bottom shell 3, the first plane intersects with the end of the inner surface of the first air duct bottom shell 3 at a point X1, the angle formed between the line segment O1X1 and the first ray is θ1, the outer diameter of the first crossflow fan blade 1 is R1, θ1=1.13*10 2 -0.468R1+9.58*10 -3 *R1 2 .

[0032] In this technical solution, when the outer diameter of the first crossflow blade 1 and the relative position relationship between the first crossflow blade 1 and the first air duct 2 satisfy: θ1 = 1.13*10 2 -0.468R1+9.58*10 -3 *R1 2 When the airflow in the first air duct 2 is smoother, the air volume of the air conditioner can be maximized, the air supply distance of the air conditioner can be increased, and a better temperature rise and drop effect can be achieved indoors, thereby improving the indoor comfort of users.

[0033] See also Figure 1 and Figure 2 As shown, the first horizontal line intersects with the inner surface of the first air duct bottom shell 3 at point A1, and the first horizontal line intersects with the outer edge of the first crossflow fan blade 1 at point B1. Point B1 is located between point A1 and point O1. The length of line segment A1B1 is h1, h1=-2.08*10 2 +4.36R1-2.15*10 -2 *R1 2 .

[0034] In this embodiment, after the outer diameter of the first crossflow blade 1 and the relative position relationship between the first crossflow blade 1 and the first air duct 2 are determined, the line segment A1B1 represents the depth of the bottom shell of the first air duct. When the depth of the bottom shell of the first air duct is small, it indicates that the space formed between the first crossflow blade 1 and the bottom shell 3 of the first air duct is small, and the aerodynamic noise of the airflow during the flow is large; when the depth of the bottom shell of the first air duct is large, it indicates that the space formed between the first crossflow blade 1 and the bottom shell 3 of the first air duct is large, and the airflow is prone to generate vortices during the flow, which reduces the air volume of the first air duct 2. When the depth of the bottom shell of the first air duct and the outer diameter of the first crossflow blade 1 meet the following conditions: h1 = -2.08*10 2 +4.36R1-2.15*10 -2 *R1 2 At the same time, the air volume of the first air duct 2 can be maximized and the aerodynamic noise can be kept low.

[0035] It should be noted that for the formula θ1 = 1.13*10 2 -0.468R1+9.58*10 -3 *R1 2 And the formula h1=-2.08*10 2 +4.36R1-2.15*10 -2 *R1 2 The derivation of is based on the experiment with the outer diameter of the first crossflow fan blade 1 of 90.4mm as an example. By calculating the air outlet of the first air duct 2 at different angles θ1 through CFD, it can be seen that the change in angle θ1 is actually the change in the rotation angle of the first air duct 2 relative to the first crossflow fan blade 1. When the rotation angle θ1 is less than 148°, the depth of the bottom shell of the first air duct decreases. At this time, although the change in the dynamic pressure gradient of the bottom shell slows down, which helps to increase the air volume, the first air intake angle θ3 also decreases, which reduces the air inlet area, resulting in a decrease in the outlet wind speed and the air volume. When the rotation angle θ1 is greater than 148°, due to the increase in the depth of the bottom shell of the first air duct, the dynamic pressure loss at the air outlet of the bottom shell of the air duct is serious, and the drastic change in the dynamic pressure gradient of the bottom shell is not conducive to the flow of wind. The final dynamic pressure loss is directly manifested as a decrease in wind speed and a decrease in air volume. At this time, there is an optimal value for the rotation angle θ1, that is, when θ1=148°, the depth of the bottom shell of the first air duct reaches the best value, and the distance between the first volute tongue 10 and the eccentric vortex generated by the first crossflow fan blade 1 reaches the best value, which ultimately makes the first air duct 2 have smooth air discharge, maximum air output, longest air supply distance, and low aerodynamic noise. That is, in this embodiment, when the outer diameter R1 of the first crossflow fan blade 1 is 90.4mm, the simulation is performed according to the maximum air volume, and finally θ1=148°, θ3=160°, and h1=9.92mm are obtained. Then, according to these data, the formula θ1=1.13*10 is derived. 2 -0.468R1+9.58*10-3 *R1 2 And the formula h1=-2.08*10 2 +4.36R1-2.15*10 -2 *R1 2 At the same time, different values ​​of R1 are substituted into the two formulas to obtain θ1 and h1. After simulation, the maximum air volume under the corresponding crossflow blade outer diameter is still obtained, which also verifies the correctness and reliability of the two formulas. It can be understood that the units of θ1, R1, and h1 in the above two formulas are removed and only the values ​​are retained. The first suction angle θ3 is the angle formed by the front ends of the first volute tongue 10 and the first volute throat 12 relative to the point O1.

[0036] See also Figure 1 and Figure 2 As shown, the air conditioner further includes a second crossflow blade 4 and a second air duct 5, the second crossflow blade 4 is arranged at the entrance of the second air duct 5, the second crossflow blade 4 has a second axis, and the second axis has an arbitrary point O2, the straight line passing through the point O2 and perpendicular to the second axis is a second horizontal line, the ray passing through the point O2 and perpendicular to the second horizontal line and the second axis is a second ray, the second ray extends along the radial direction of the second crossflow blade 4 and extends out of the entrance of the second air duct 5, the plane where the second ray and the second horizontal line are located is the second plane, the second air duct 5 has a second air duct bottom shell 6, the second plane intersects with the end of the inner surface of the second air duct bottom shell 6 at point X2, the angle formed between the line segment O2X2 and the second ray is θ2, the outer diameter of the second crossflow blade 4 is R2, θ2=1.13*10 2 -0.468R2+9.58*10 -3 *R2 2 .

[0037] In this technical solution, when the outer diameter of the second crossflow blade 4 and the relative position relationship between the second crossflow blade 4 and the second air duct 5 satisfy: θ2 = 1.13*10 2 -0.468R2+9.58*10 -3 *R2 2 When the airflow in the second air duct 5 is smoother, the air volume of the two air ducts of the air conditioner can be maximized, thereby respectively increasing the air supply distance of the two air ducts of the air conditioner, and further achieving a better temperature rise and drop effect indoors.

[0038] See also Figure 1 and Figure 2 As shown, the second horizontal line intersects the inner surface of the second air duct bottom shell 6 at point A2, and the second horizontal line intersects the outer edge of the second crossflow fan blade 4 at point B2. Point B2 is located between point A2 and point O2. The length of line segment A2B2 is h2, h2 = -2.08*10 2+4.36R2-2.15*10 -2 *R2 2 .

[0039] In this embodiment, after the outer diameter of the second crossflow blade 4 and the relative position relationship between the second crossflow blade 4 and the second air duct 5 are determined, the line segment A2B2 represents the depth of the second air duct bottom shell. When the depth of the second air duct bottom shell is small, it indicates that the space formed between the second crossflow blade 4 and the second air duct bottom shell 6 is small, and the aerodynamic noise of the airflow during the flow is large; when the depth of the second air duct bottom shell is large, it indicates that the space formed between the second crossflow blade 4 and the second air duct bottom shell 6 is large, and the airflow is prone to generate vortices during the flow, which reduces the air volume of the second air duct 5. When the depth of the second air duct bottom shell and the outer diameter of the second crossflow blade 4 satisfy: h2 = -2.08*10 2 +4.36R2-2.15*10 -2 *R2 2 At the same time, the air volume of the second air duct 5 can be maximized and the aerodynamic noise can be kept low.

[0040] It should be noted that for the formula θ2 = 1.13*10 2 -0.468R2+9.58*10 -3 *R2 2 And the formula h2 = -2.08*10 2 +4.36R2-2.15*10 -2 *R2 2The derivation is based on the experiment with the outer diameter of the second crossflow fan blade 4 of 90.4mm as an example. By calculating the air outlet of the second air duct 5 at different angles θ2 through CFD, it can be seen that the change in angle θ2 is actually the change in the rotation angle of the second air duct 5 relative to the second crossflow fan blade 4. When the rotation angle θ2 is less than 148°, the depth of the bottom shell of the second air duct decreases. At this time, although the slowdown in the change of the dynamic pressure gradient of the bottom shell helps to increase the air volume, the second air intake angle θ4 also decreases, which reduces the air inlet area, resulting in a decrease in the outlet wind speed and the air volume. When the rotation angle θ2 is greater than 148°, due to the increase in the depth of the bottom shell of the second air duct, the dynamic pressure loss at the air outlet of the bottom shell of the air duct is serious, and the drastic change in the dynamic pressure gradient of the bottom shell is not conducive to the flow of wind. The final dynamic pressure loss is directly manifested as a decrease in wind speed and a decrease in air volume. At this time, there is an optimal value for the rotation angle θ2, that is, when θ2 = 148°, the depth of the bottom shell of the second air duct reaches the best, and the distance between the second volute tongue 11 and the eccentric vortex generated by the second crossflow fan blade 4 reaches the best, which ultimately makes the second air duct 5 have smooth air discharge, maximum air output, longest air supply distance, and low aerodynamic noise. That is, this embodiment is simulated according to the maximum air volume when the outer diameter R2 of the second crossflow fan blade 4 is 90.4mm, and finally obtains θ2 = 148°, θ4 = 160°, and h2 = 9.92mm. Then, according to these data, the formula θ2 = 1.13*10 is derived. 2 -0.468R2+9.58*10 -3 *R2 2 And the formula h2 = -2.08*10 2 +4.36R2-2.15*10 -2 *R2 2 At the same time, different values ​​of R2 are substituted into the two formulas to obtain θ2 and h2. After simulation, the maximum air volume under the corresponding crossflow blade outer diameter is still obtained, which also verifies the correctness and reliability of the two formulas. It can be understood that the units of θ2, R2, and h2 in the above two formulas are removed and only the values ​​are retained. The second suction angle θ4 is the angle formed by the second volute tongue 11 and the second volute throat 13 relative to the point O2.

[0041] It should be noted that the technical solution for increasing the air supply distance of the present application can be applied to both single-flow fan air conditioners and double-flow fan air conditioners, and can be applied to both cabinet units and wall-mounted units.

[0042] Figure 6 This is a simulation diagram of the air volume and the different angles of the air duct relative to the cross-flow blade when the outer diameter of the cross-flow blade of the air conditioner according to the embodiment of the present invention is 90.4 mm. Figure 6When the rotation speed of the crossflow blade is 1200r, 1300r and 1400r, the air conditioner can obtain the maximum air volume when the angle of the air duct relative to the crossflow blade is equal to 148°. The rotation angle is θ1 or θ2.

[0043] Figure 7 This is a simulation diagram of the suction angle and air volume of the cross-flow fan blade when the outer diameter of the cross-flow fan blade of the air conditioner according to the embodiment of the present invention is 90.4 mm. Figure 7 When the rotation speed of the crossflow fan blade is 1200r, 1300r and 1400r, the air intake angle is equal to 160°, and the air conditioner can obtain the maximum air output. The air intake angle is θ3 or θ4.

[0044] Figure 8 This is a simulation diagram of the depth of the bottom shell of the air duct and the air volume when the outer diameter of the cross-flow fan blade of the air conditioner according to the embodiment of the present invention is 90.4 mm. Figure 8 When the rotation speed of the crossflow fan blade is 1200r, 1300r and 1400r, the air conditioner can obtain the maximum air output when the depth of the air duct bottom shell is equal to 9.92mm. The depth of the air duct bottom shell is h1 or h2.

[0045] Furthermore, this application also designs two schemes for comparison. Scheme 1: The outer diameter of the crossflow fan blade is 90.4mm, the angle of the air duct relative to the crossflow fan blade is 148°, the air intake angle is 160°, and the depth of the air duct bottom shell is 9.92mm; Scheme 2: The angle of the air duct relative to the crossflow fan blade is 166°, the air intake angle is 178°, and the depth of the air duct bottom shell is 13mm. These two schemes are compared to test how much the air volume can be increased by this application. Scheme 1 and Scheme 2 were tested at a rotation speed of 1300r. After testing, it was finally concluded that compared with Scheme 2, Scheme 1 increased the air intake speed from 3m / s to 3.5m / s, the air intake speed increased by 17%, and the air volume increased by 12.5%. The air intake speed and air volume increased significantly. For specific comparisons, please refer to the table below.

[0046]

[0047]

[0048] See also Figure 4 and Figure 5 As shown, the first crossflow blade 1 and the second crossflow blade 4 are symmetrically distributed, and the first air duct 2 and the second air duct 5 are also symmetrically distributed, which makes the air conditioner of the present application more aesthetically pleasing. Among them, the end of the first air duct 2 corresponds to the first air outlet 14 of the air conditioner, and the end of the second air duct 5 corresponds to the second air outlet 15 of the air conditioner.

[0049] See also Figure 3 and Figure 4 As shown, the air conditioner further includes an indoor heat exchanger 7 , and the indoor heat exchanger 7 is located in the negative pressure area of ​​the first cross flow blade 1 and the second cross flow blade 4 at the same time.

[0050] In this technical solution, when the indoor heat exchanger 7 is located in the negative pressure area of ​​the first crossflow blade 1 and the second crossflow blade 4 at the same time, it indicates that the first crossflow blade 1 and the second crossflow blade 4 share the same indoor heat exchanger 7. Therefore, when assembling the air conditioner, facing the double crossflow fans and double air ducts, only one indoor heat exchanger 7 needs to be assembled, thereby reducing the assembly process and improving the assembly efficiency.

[0051] See also Figure 3 and Figure 4 As shown, the negative pressure area of ​​the first crossflow fan blade 1 is also provided with a first electric heating device 8. For northern regions, the temperature is relatively low in winter, and it is often difficult to meet the heating demand by relying solely on the refrigerant circulation heating of the air conditioner. The provision of the first electric heating device 8 is equivalent to adding an additional auxiliary heating function to the air conditioner. When the temperature is relatively low, the refrigerant circulation heating and the auxiliary heating of the first electric heating device 8 can be used simultaneously to make the air outlet temperature of the first air outlet 14 of the air conditioner higher, thereby meeting the heating demand when the temperature is relatively low.

[0052] See also Figure 3 and Figure 4 As shown, the first electric heating device 8 is located between the indoor heat exchanger 7 and the first crossflow fan blade 1. When the air conditioner is in heating mode, since the first electric heating device 8 can generate a higher temperature than the indoor heat exchanger 7, when the first electric heating device 8 is located between the indoor heat exchanger 7 and the first crossflow fan blade 1, the airflow can be heated up in sequence, so that the first air outlet 14 of the air conditioner can blow out air with a higher temperature.

[0053] See also Figure 3 and Figure 4 As shown, the negative pressure area of ​​the second crossflow fan blade 4 is also provided with a second electric heating device 9. The provision of the second electric heating device 9 is equivalent to adding an additional auxiliary heating function to the air conditioner. For northern regions, when the temperature is low in winter, the refrigerant circulation heating and the auxiliary heating of the second electric heating device 9 can be used simultaneously to make the air outlet temperature of the second air outlet 15 of the air conditioner higher, thereby meeting the heating demand when the temperature is low.

[0054] See also Figure 3 and Figure 4As shown, the second electric heating device 9 is located between the indoor heat exchanger 7 and the second crossflow fan blade 4. When the air conditioner is in heating mode, since the second electric heating device 9 can generate a higher temperature than the indoor heat exchanger 7, when the second electric heating device 9 is located between the indoor heat exchanger 7 and the second crossflow fan blade 4, the airflow can be heated up in sequence, so that the second air outlet 15 of the air conditioner can blow out air with a higher temperature.

[0055] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An air conditioner, characterized in that: The invention comprises a first crossflow fan blade (1) and a first air duct (2), wherein the first crossflow fan blade (1) is arranged at the entrance of the first air duct (2), the first crossflow fan blade (1) has a first axis, the first axis has an arbitrary point O1, a straight line passing through the point O1 and perpendicular to the first axis is a first horizontal line, a ray passing through the point O1 and perpendicular to the first horizontal line and the first axis is a first ray, the first ray extends along the radial direction of the first crossflow fan blade (1) and extends out of the entrance of the first air duct (2), the plane on which the first ray and the first horizontal line are located is a first plane, the first air duct (2) has a first air duct bottom shell (3), the first plane intersects with the end of the inner surface of the first air duct bottom shell (3) at a point X1, the angle formed between the line segment O1X1 and the first ray is θ1, the outer diameter of the first crossflow fan blade (1) is R1, θ1=1.13*10 2 -0.468R1+9.58*10 -3 *R1 2 .

2. The air conditioner according to claim 1, characterized in that: The first horizontal line intersects with the inner surface of the first air duct bottom shell (3) at point A1, and the first horizontal line intersects with the outer edge of the first crossflow fan blade (1) at point B1. The point B1 is located between the point A1 and the point O1. The length of the line segment A1B1 is h1, where h1=-2.08*10 2 +4.36R1-2.15*10 -2 *R1 2 .

3. The air conditioner according to claim 1 or 2, characterized in that: The invention also comprises a second crossflow fan blade (4) and a second air duct (5), wherein the second crossflow fan blade (4) is arranged at the entrance of the second air duct (5), the second crossflow fan blade (4) has a second axis, and the second axis has an arbitrary point O2, a straight line passing through the point O2 and perpendicular to the second axis is a second horizontal line, a ray passing through the point O2 and perpendicular to the second horizontal line and the second axis is a second ray, the second ray extends along the radial direction of the second crossflow fan blade (4) and extends out of the entrance of the second air duct (5), the plane on which the second ray and the second horizontal line are located is a second plane, the second air duct (5) has a second air duct bottom shell (6), the second plane intersects with the end of the inner surface of the second air duct bottom shell (6) at a point X2, the angle formed between the line segment O2X2 and the second ray is θ2, the outer diameter of the second crossflow fan blade (4) is R2, θ2=1.13*10 2 -0.468R2+9.58*10 -3 *R2 2 .

4. The air conditioner according to claim 3, characterized in that: The second horizontal line intersects with the inner surface of the second air duct bottom shell (6) at point A2, and the second horizontal line intersects with the outer edge of the second crossflow fan blade (4) at point B2. The point B2 is located between the point A2 and the point O2. The length of the line segment A2B2 is h2, where h2=-2.08*10 2 +4.36R2-2.15*10 -2 *R2 2 .

5. The air conditioner according to claim 3, characterized in that: The first cross-flow blades (1) and the second cross-flow blades (4) are symmetrically distributed, and the first air duct (2) and the second air duct (5) are also symmetrically distributed.

6. The air conditioner according to claim 3, characterized in that: It also includes an indoor heat exchanger (7), and the indoor heat exchanger (7) is located in the negative pressure area of ​​the first cross-flow fan blade (1) and the second cross-flow fan blade (4).

7. The air conditioner according to claim 6, characterized in that: The negative pressure area of ​​the first crossflow fan blade (1) is also provided with a first electric heating device (8).

8. The air conditioner according to claim 7, characterized in that: The first electric heating device (8) is located between the indoor heat exchanger (7) and the first cross-flow fan blade (1).

9. The air conditioner according to claim 6, characterized in that: The negative pressure area of ​​the second crossflow fan blade (4) is also provided with a second electric heating device (9).

10. The air conditioner according to claim 9, characterized in that: The second electric heating device (9) is located between the indoor heat exchanger (7) and the second cross-flow fan blade (4).

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