An air duct system and an air conditioner having the same

Abstract

The application relates to the field of air conditioners, and provides an air duct system and an air conditioner with the same. The air duct system comprises a volute, the volute is provided with a mounting cavity and an air inlet communicated with the mounting cavity; a fan blade is arranged in the mounting cavity and opposite to the air inlet; and a flow guide ring is arranged at the air inlet; the axis of the flow guide ring is in the same line with the axis of the fan blade, and the inner diameter s of the flow guide ring is less than or equal to the inner diameter h of the fan blade. The structural parameters of the flow guide ring and the fan blade are optimized, the flow guide ring has a wrapping effect on the fan blade, the inlet pressure and the airflow flow in the middle part of the fan blade are improved, the airflow flow direction on the air inlet side gradually expands from the flow guide ring to the middle, the air inlet efficiency is improved, the air inlet resistance is reduced, the air volume of the air duct system is improved through the cooperation of the flow guide ring and the fan blade. In addition, the air duct system can realize multiple air outlet modes such as full upper air outlet, full lower air outlet and distributed air supply.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, and more particularly to an air duct system and an air conditioner having the same. Background Technology

[0002] In related technologies, air duct systems improve airflow by incorporating guide rings at the air inlet of the volute. Figure 1 and Figure 2 As shown. But in Figure 1 and Figure 2 The solutions presented in the relevant technologies do not optimize the structural parameters of the guide ring and the fan blades well, resulting in problems such as low air intake efficiency and high air intake resistance. Summary of the Invention

[0003] To address the technical problems of low air intake efficiency and high air intake resistance in related duct systems, a duct system and an air conditioner with it are proposed.

[0004] According to one aspect of the present invention, a duct system is provided, comprising: a volute having a mounting cavity and an air inlet communicating with the mounting cavity; a fan blade mounted in the mounting cavity and disposed opposite to the air inlet; and a guide ring mounted at the air inlet; wherein the axis of the guide ring is colinear with the axis of the fan blade, and the inner diameter s of the guide ring is less than or equal to the inner diameter h of the fan blade.

[0005] By applying the technical solution of this invention, the structural parameters of the guide ring and the fan blade are optimized, so that the axis of the guide ring and the axis of the fan blade are on the same straight line, and the inner diameter s of the guide ring is less than or equal to the inner diameter h of the fan blade, so that the guide ring wraps around the fan blade, improving the inlet pressure and the airflow in the middle of the fan blade. The airflow direction on the air inlet side gradually expands from the guide ring to the middle, thereby improving the air intake efficiency and reducing the air intake resistance. Through the cooperation of the guide ring and the fan blade, the air volume of the duct system can be increased.

[0006] Furthermore, the relationship between the inner diameter h of the fan blade and the outer diameter d of the fan blade is: h = (0.88~0.92) × d; the relationship between the inner diameter s of the guide ring and the outer diameter d of the fan blade is: s = (0.85~0.88) × d.

[0007] Furthermore, the projection of the guide ring onto a plane parallel to its axis forms the profile of the guide ring. The profile includes a first profile and a second profile symmetrically arranged on both sides of the guide ring's axis. The first profile includes a first straight line segment AB, a first arc segment BC, a second arc segment CD, a third arc segment DE, a fourth arc segment EF, a fifth arc segment FG, a sixth arc segment GH, and a second straight line segment HI, connected sequentially. The first straight line segment AB is tangent to endpoint B of the first arc segment BC; the tangent at endpoint C of the first arc segment BC intersects with the second arc segment C. The tangent at endpoint C of arc segment D is on the same straight line; the tangent at endpoint D of arc segment CD is on the same straight line as the tangent at endpoint D of arc segment DE; the tangent at endpoint E of arc segment DE is on the same straight line as the tangent at endpoint E of arc segment EF; the tangent at endpoint F of arc segment EF is on the same straight line as the tangent at endpoint F of arc segment FG; the tangent at endpoint G of arc segment FG is on the same straight line as the tangent at endpoint G of arc segment GH; the endpoint H of arc segment GH is tangent to the second straight line segment HI.

[0008] Furthermore, the relationship between the length L1 of the first straight segment AB and the outer diameter d of the blade is: L1 = (0.15~0.19)×d; the relationship between the radius r1 of the first arc segment BC and the outer diameter d of the blade is: r1 = 0.279×d; the relationship between the radius r2 of the second arc segment CD and the outer diameter d of the blade is: r2 = 0.276×d; the relationship between the radius r3 of the third arc segment DE and the outer diameter d of the blade is: r3 = 0.141×d; the relationship between the radius r4 of the fourth arc segment EF and the outer diameter d of the blade is: r4 = 0.019×d; the relationship between the radius r5 of the fifth arc segment FG and the outer diameter d of the blade is: r5 = 0.183×d; the relationship between the radius r6 of the sixth arc segment GH and the outer diameter d of the blade is: r6 = 0.186×d; and the relationship between the length L2 of the second straight segment HI and the outer diameter d of the blade is: L2 = (0.15~0.19)×d.

[0009] Furthermore, the range of the outer diameter d of the fan blade is: 100mm≤d≤400mm.

[0010] Furthermore, the range of the gap c between the guide ring and the fan blade is: 6mm≤c≤12mm.

[0011] Furthermore, the relationship between the width a of the air duct and the outer diameter d of the fan blade is: a = (0.42~0.45) × d; the relationship between the width b of the fan blade and the outer diameter d of the fan blade is: b = (0.35~0.4) × d.

[0012] Furthermore, the volute also has an upper air outlet and a lower air outlet communicating with the mounting cavity; the duct system also includes: a volute mechanism, which is rotatably disposed in the mounting cavity, and has a first state of closing the upper air outlet and a second state of closing the lower air outlet; when the volute mechanism is in the first state or the second state, the volute mechanism and the volute together form the duct, and the projection of the duct on a plane perpendicular to the axis of the fan blade forms the profile of the duct; the profile of the duct includes stepped line segments, which include a first curve segment MNO, a sudden straight line segment OP, and a second curve segment PQ connected in sequence; the length n of the sudden straight line segment OP is in the range of 0mm≤n≤10mm.

[0013] Furthermore, a polar coordinate system is established with the center Y of the wind turbine blade as the pole and the polar axis Z as the polar axis. ∠OYZ is γ, and the range of the radian value of γ is 1≤γ≤1.3.

[0014] Furthermore, establishing a polar coordinate system with the center Y of the wind turbine blades as the pole and the polar axis Z, the equation of the profile of the first curve segment MNO is: r = f + g × θ + q × θ 2 , where 1.35≤θ≤2π-γ, 150≤f≤155, -15≤g≤-11, 0≤q≤5.

[0015] Furthermore, the duct profile also includes a third straight segment QR and a third curved segment RS connected in sequence. The third straight segment QR is connected to and tangent to the second curved segment PQ. The first curved segment MNO, the abrupt straight segment OP, the second curved segment PQ, the third straight segment QR, and the third curved segment RS have a similarity of more than 95% to the standard spiral.

[0016] Furthermore, there are multiple volutes and multiple spiral mechanisms, with one spiral mechanism installed inside each volute. When all the spiral mechanisms are in the first state, the air duct system is in a fully downward air outlet mode. When all the spiral mechanisms are in the second state, the air duct system is in a fully upward air outlet mode. When some of the spiral mechanisms are in the first state and others are in the second state, the air duct system is in a vertical air outlet mode.

[0017] Furthermore, there are two volutes, one located at the top and one at the bottom. The upper volute also includes a first upper air duct and a first lower air duct communicating with the mounting cavity. The lower volute also includes a second upper air duct and a second lower air duct communicating with the mounting cavity. The second upper air duct bends forward and is arranged parallel to the first upper air duct. The upper air outlets of the first and second upper air ducts converge at the top to form the upper air outlet of the air duct system. The first lower air duct bends forward and is arranged parallel to the second lower air duct. The lower air outlets of the first and second lower air ducts converge at the bottom to form the lower air outlet of the air duct system. There are two spiral mechanisms, with one spiral mechanism correspondingly installed in each volute.

[0018] According to another aspect of the present invention, an air conditioner is also provided, which includes the above-described air duct system. Attached Figure Description

[0019] Figure 1 A schematic diagram of a portion of the structure of a duct system in the related technology is shown;

[0020] Figure 2 It shows Figure 1 Enlarged structural diagram at point A;

[0021] Figure 3 A schematic diagram of a partial structure of an air duct system according to an optional embodiment of the present invention is shown;

[0022] Figure 4 It shows Figure 3 Enlarged structural diagram at point B;

[0023] Figure 5 It shows Figure 3 The structural diagram shows that h is the inner diameter of the fan blade, s is the inner diameter of the guide ring, d is the outer diameter of the guide ring, c is the gap between the fan blade and the guide ring, a is the width of the air duct, and b is the width of the fan blade.

[0024] Figure 6 A schematic diagram of the profile of the air guide ring according to an optional embodiment of the present invention is shown;

[0025] Figure 7 It shows Figure 5 The right view;

[0026] Figure 8 A schematic diagram of a partial structure of an air duct system according to an optional embodiment of the present invention is shown, wherein the vortex mechanism is in a first state;

[0027] Figure 9 A schematic diagram of a partial structure of an air duct system according to an optional embodiment of the present invention is shown, wherein the vortex mechanism is in a second state;

[0028] Figure 10 It shows Figure 9 A schematic diagram of the air duct profile formed by the spiral mechanism and the volute.

[0029] Figure 11 The annotations are shown Figure 10 A schematic diagram of the structure;

[0030] Figure 12 A schematic diagram of an air conditioner according to an optional embodiment of the present invention is shown, wherein the air conditioner is in an up-and-down air outlet mode;

[0031] Figure 13 It shows Figure 12 A schematic diagram of the air conditioner in the image, showing the air conditioner in top and bottom airflow mode;

[0032] Figure 14 It shows Figure 12 A schematic diagram of the air conditioner in the image, showing the air conditioner in full bottom air outlet mode;

[0033] Figure 15 It shows Figure 12 A schematic diagram of the air conditioner in the picture, showing the air conditioner in full top air outlet mode;

[0034] Figure 16 It shows Figure 1 Pressure distribution at the air inlet of the duct system before the improvement of the middle guide ring and Figure 3 A comparison diagram of the pressure distribution at the air inlet of the improved air duct system with the improved central guide ring.

[0035] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0036] In the attached diagram:

[0037] 10. Volute; 11. Mounting cavity; 12. Air inlet; 13. Upper air outlet; 14. Lower air outlet; 20. Fan blade; 30. Guide ring; 40. Volute mechanism; 50. Motor; 1. Air duct; 2. Air inlet grille; 3. Front panel; 4. Heat exchanger. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0039] In order to solve the technical problems of low air intake efficiency and high air intake resistance in related technologies, the present invention provides an air intake system and an air conditioner having the same.

[0040] The air duct systems in related technologies do not optimize the structural parameters of the guide ring and fan blades, and do not consider the impact of the relationship between the inner diameter *s* of the guide ring and the inner diameter *h* of the fan blades on air intake efficiency and air intake resistance. Figure 1 and Figure 2In the technical solution shown, the inner diameter s of the air guide ring is larger than the inner diameter h of the fan blade. The air guide ring does not wrap the fan blade well, and the middle part of the air inlet is relatively large. The airflow will flow to the area with low pressure. Therefore, the airflow before the improvement can easily enter the fan blade from the periphery of the inlet. Such flow is not smooth and has the problems of low air intake efficiency and high air intake resistance.

[0041] like Figures 3 to 7 As shown, this application provides an air duct system, including: a volute 10, the volute 10 having a mounting cavity 11 and an air inlet 12 communicating with the mounting cavity 11; a fan blade 20, the fan blade 20 being installed in the mounting cavity 11 and disposed opposite to the air inlet 12; and a guide ring 30, the guide ring 30 being installed at the air inlet 12; wherein, the axis of the guide ring 30 is on the same straight line as the axis of the fan blade 20, and the inner diameter s of the guide ring 30 is less than or equal to the inner diameter h of the fan blade 20.

[0042] By applying the technical solution of this invention, the structural parameters of the guide ring and the fan blades are optimized, ensuring that the axis of the guide ring 30 is collinear with the axis of the fan blade 20, and that the inner diameter s of the guide ring is less than or equal to the inner diameter h of the fan blade. This allows the guide ring to wrap around the fan blade, improving the inlet pressure and airflow in the middle of the fan blade. The airflow direction on the inlet side gradually expands from the guide ring towards the center, thereby improving air intake efficiency and reducing air intake resistance. Through the cooperation of the guide ring and the fan blades, the airflow volume of the duct system can be increased. Figure 16 As shown, compared with the original design, the pressure in the middle part of the air inlet 12 is relatively small and uniform after the improvement, and the airflow can easily enter the fan blade from the middle part of the inlet, resulting in smooth flow.

[0043] Optionally, the relationship between the inner diameter h of the fan blade 20 and the outer diameter d of the fan blade 20 is: h = (0.88~0.92) × d; the relationship between the inner diameter s of the guide ring 30 and the outer diameter d of the fan blade 20 is: s = (0.85~0.88) × d. Extensive testing has verified that the effect is better when the above parameters are limited to the above dimensional ranges.

[0044] Preferably, h = 0.891 × d. Extensive testing has shown that the effect is better when the above parameters are limited to the above-mentioned size range.

[0045] Preferably, h = 0.891 × d + 26 mm. Extensive testing has verified that the effect is better when the above parameters are limited to the above dimensional range.

[0046] Preferably, s = 0.875 × d. Extensive testing has shown that the effect is better when the above parameters are limited to the above-mentioned size range.

[0047] Optionally, such as Figure 6As shown, the projection of the guide ring 30 onto a plane parallel to the axis of the guide ring 30 forms the profile of the guide ring 30. The profile of the guide ring 30 includes a first profile and a second profile symmetrically arranged on both sides of the axis of the guide ring 30. The first profile includes a first straight line segment AB, a first arc segment BC, a second arc segment CD, a third arc segment DE, a fourth arc segment EF, a fifth arc segment FG, a sixth arc segment GH, and a second straight line segment HI connected in sequence. The first straight line segment AB is tangent to endpoint B of the first arc segment BC; the tangent at endpoint C of the first arc segment BC is collinear with the tangent at endpoint C of the second arc segment CD; the tangent at endpoint D of the second arc segment CD is collinear with the tangent at endpoint D of the third arc segment DE; the tangent at endpoint E of the third arc segment DE is collinear with the tangent at endpoint E of the fourth arc segment EF; the tangent at endpoint F of the fourth arc segment EF is collinear with the tangent at endpoint F of the fifth arc segment FG; the tangent at endpoint G of the fifth arc segment FG is collinear with the tangent at endpoint G of the sixth arc segment GH; and the endpoint H of the sixth arc segment GH is tangent to the second straight line segment HI. Thus, by optimizing the shape of the guide ring 30, the airflow guiding effect is improved while ensuring the wrapping effect.

[0048] Optionally, such as Figure 6 As shown, the relationship between the length L1 of the first straight segment AB and the outer diameter d of the blade 20 is: L1 = (0.15~0.19) × d; the relationship between the radius r1 of the first arc segment BC and the outer diameter d of the blade 20 is: r1 = 0.279 × d; the relationship between the radius r2 of the second arc segment CD and the outer diameter d of the blade 20 is: r2 = 0.276 × d; the relationship between the radius r3 of the third arc segment DE and the outer diameter d of the blade 20 is: r3 = 0.141 × The relationship between the radius r4 of the fourth arc segment EF and the outer diameter d of the blade 20 is: r4 = 0.019 × d; the relationship between the radius r5 of the fifth arc segment FG and the outer diameter d of the blade 20 is: r5 = 0.183 × d; the relationship between the radius r6 of the sixth arc segment GH and the outer diameter d of the blade 20 is: r6 = 0.186 × d; the relationship between the length L2 of the second straight segment HI and the outer diameter d of the blade 20 is: L2 = (0.15 ~ 0.19) × d. Extensive experimental verification shows that the effect is better when the above parameters are limited to the above dimensional range.

[0049] Optionally, the outer diameter d of the fan blade 20 can be in the range of 100mm ≤ d ≤ 400mm. Extensive testing has shown that the performance is better when these parameters are limited to this range.

[0050] Preferably, d = 240 mm. Extensive testing has shown that the effect is better when the above parameters are limited to the above dimensional range.

[0051] Optionally, such as Figure 5 As shown, the gap c between the guide ring 30 and the fan blade 20 ranges from 6mm to 12mm. Extensive testing has verified that when these parameters are within this range, the effect is better, effectively reducing broadband abnormal noise in the duct system.

[0052] Preferably, c = 9mm. Extensive testing has shown that the effect is better when the above parameters are limited to the above dimensional range.

[0053] Optionally, such as Figure 5 As shown, the relationship between the width 'a' of the duct and the outer diameter 'd' of the fan blade 20 is: a = (0.42~0.45) × d; the relationship between the width 'b' of the fan blade 20 and the outer diameter 'd' of the fan blade 20 is: b = (0.35~0.4) × d. Extensive testing has verified that when the above parameters are limited to the aforementioned dimensional ranges, the effect is better, effectively reducing broadband abnormal noise in the duct system.

[0054] a = 0.433 × d. Extensive testing has shown that the effect is better when the above parameters are limited to the above-mentioned size range.

[0055] b = 0.392 × d. Extensive testing has shown that the effect is better when the above parameters are limited to the above-mentioned size range.

[0056] like Figures 8 to 11 As shown, the volute 10 also has an upper air outlet 13 and a lower air outlet 14 communicating with the mounting cavity 11; the duct system also includes a volute mechanism 40, which is rotatably disposed within the mounting cavity 11. The volute mechanism 40 has a first state of closing the upper air outlet 13 and a second state of closing the lower air outlet 14. When the volute mechanism 40 is in the first or second state, the volute mechanism 40 and the volute 10 together form the duct. The projection of the duct onto a plane perpendicular to the axis of the fan blade 20 forms the duct profile. The duct profile includes stepped segments, which include a first curved segment MNO, a sudden straight segment OP, and a second curved segment PQ connected in sequence. The length n of the sudden straight segment OP is in the range of 0mm ≤ n ≤ 10mm. Extensive testing has verified that the effect is better when the above parameters are limited to the above dimensional range.

[0057] Preferably, n = 8 mm. Extensive testing has shown that the effect is better when the above parameters are limited to the above dimensional range.

[0058] In special cases, the length n of the abrupt straight line segment OP is 0, and the first curve segment MNO and the second curve segment PQ transition smoothly.

[0059] like Figure 11 As shown, a polar coordinate system is established with the center Y of the blade 20 as the pole and the polar axis Z as the polar axis. ∠OYZ is γ, and the range of γ's radian value is 1≤γ≤1.3.

[0060] like Figure 11 As shown, with the center Y of the blade 20 as the pole and a polar coordinate system established with the polar axis Z, the equation of the profile of the first curve segment MNO is: r = f + g × θ + q × θ 2 Wherein, 1.35≤θ≤2π-γ, 150≤f≤155, -15≤g≤-11, 0≤q≤5. Thus, by optimizing the duct profile parameters, and by coordinating the first curve segment obtained through the above equations with the abrupt straight line segment OP and the second curve segment PQ, experiments have verified that the duct system provided in this application is beneficial for reducing broadband abnormal noise in the duct system.

[0061] like Figure 11 As shown, the duct profile also includes a third straight segment QR and a third curved segment RS connected in sequence. The third straight segment QR is connected to and tangent to the second curved segment PQ. The first curved segment MNO, the abrupt straight segment OP, the second curved segment PQ, the third straight segment QR, and the third curved segment RS have a similarity of more than 95% to the standard spiral.

[0062] The standard spiral referred to in this application means a logarithmic spiral, whose formula is R = d / 2 * e. p*θ / d (Polar coordinate formula, R is the radius, θ is the radian value, d is the outer diameter of the blade, e is a mathematical constant, and p is a coefficient).

[0063] The key improvements of this invention lie in the range of values ​​for the length n of OP, the curve equation of the first curve MNO, and the fact that the similarity between the first curve segment MNO, the abrupt straight line segment OP, the second curve segment PQ, the third straight line segment QR, and the third curve segment RS and the standard spiral is greater than 95%. The remaining curve shapes should conform to industry conventions.

[0064] like Figures 12 to 15 As shown, there are multiple volutes 10 and multiple spiral mechanisms 40, with one spiral mechanism 40 installed inside each volute 10. When all spiral mechanisms 40 are in the first state, the air duct system is in a fully downward air outlet mode; when all spiral mechanisms 40 are in the second state, the air duct system is in a fully upward air outlet mode; when some of the spiral mechanisms 40 are in the first state and others are in the second state, the air duct system is in a top-bottom air outlet mode. Thus, the air duct system of this application offers a variety of air outlet modes for users to choose from, which helps improve the user experience.

[0065] like Figure 12 and Figure 13 As shown, the air duct system is in top and bottom air outlet mode, where, Figure 13 The illustrated alternative embodiment is preferred, as it has a shorter airflow path, less flow loss, and a larger air volume.

[0066] like Figure 14 As shown, the air duct system is in full bottom air outlet mode; Figure 15 As shown, the air duct system is in full top air outlet mode.

[0067] like Figure 12 As shown, there are two volutes 10, one volute 10 located at the top and one volute 10 located at the bottom. The upper volute 10 also includes a first upper air duct and a first lower air duct communicating with the mounting cavity 11. The lower volute 10 also includes a second upper air duct and a second lower air duct communicating with the mounting cavity 11. The second upper air duct bends forward and is arranged in parallel with the first upper air duct. The upper air outlets of the first upper air duct and the second upper air duct converge at the top to form the upper air outlet of the air duct system. The first lower air duct bends forward and is arranged in parallel with the second lower air duct. The lower air outlets of the first lower air duct and the second lower air duct converge at the bottom to form the lower air outlet of the air duct system. There are two spiral mechanisms 40, and one spiral mechanism 40 is correspondingly provided in each volute 10.

[0068] like Figures 12 to 15 As shown, this application also provides an air conditioner, which includes the air duct system described above or below.

[0069] Traditional air conditioners, due to the rising nature of hot air during heating, result in higher temperatures in the upper part of the room and lower temperatures in the lower part, causing users to feel hot in the head and cold in the feet. Simultaneously, because a large amount of hot air accumulates at the top of the room, it cannot effectively reach the areas where people are active, leading to significant heat waste during heating. Distributed air conditioning units can achieve heating from the feet up and cooling without blowing cold air directly on people, with a minimum vertical temperature difference of 3°C, but this still falls short of human satisfaction needs. The air conditioner provided in this application, however, features a full top air outlet mode, a full bottom air outlet mode, and a top-and-bottom air outlet mode, achieving a vertical temperature difference of 0.05°C, effectively preventing direct airflow, improving user comfort, and increasing the utilization rate of body heat, resulting in extremely high energy efficiency.

[0070] The top-to-bottom air outlet mode described in this application can also be called the distributed air outlet mode.

[0071] Noise and airflow are key factors affecting air conditioning product quality. Related technologies utilize a dual centrifugal vortex reversing fan system for top-to-bottom airflow distribution. However, the duct system in these technologies only approximates a standard spiral path by 80%–90%, resulting in a smaller effective volute size. This leads to reduced fan efficiency, decreased system airflow, and abnormal noise. This problem is particularly pronounced when the system's intake area is limited. Furthermore, limited intake area results in higher intake resistance, leading to turbulent airflow, low fan efficiency, and reduced system airflow. Therefore, it is crucial to address the abnormal noise issue and improve the airflow of this duct system. Further optimization of the duct system is necessary. This invention proposes a parametric design method for a cabinet-type air conditioning duct system, applicable to cabinet air conditioners. This method enables various airflow modes, including top-to-bottom, bottom-to-bottom, and distributed airflow, achieving the rated airflow level in all three modes. For dual centrifugal vortex reversing fan systems that have non-standard volute profiles and limited air inlet area, parametric design of the duct system is employed. This involves optimizing duct parameters and guide ring parameters to improve inlet pressure and airflow in the middle of the fan blades. This causes the airflow direction on the inlet side to gradually expand from the periphery of the guide ring towards the center, thereby improving air intake efficiency and ultimately increasing the airflow volume of the duct system. This also effectively reduces the broadband abnormal noise of the duct system.

[0072] The technical problems solved by this invention include at least: solving the problems of low air intake efficiency and small air output volume in duct systems; and solving the problem of abnormal broadband noise in duct systems. Beneficial effects:

[0073] The invention includes at least the following aspects: a fully top- and fully bottom-discharge air conditioner capable of multiple air outlet modes, including fully top-, fully bottom-, and distributed air supply, achieving rated air volume in all three modes and a vertical temperature difference of only 0.05℃, significantly improving human comfort and heat utilization efficiency, resulting in extremely high energy savings. The duct profile features abrupt changes to accommodate the vortex mechanism's reversing motion, thus enabling fully top- and fully bottom-discharge air outlets. Broadband noise anomalies in the duct system are reduced by controlling key parameters such as the volute profile, duct width a, blade width b, blade-guide ring gap c, blade outer diameter d, blade inner diameter h, and guide ring diameter s. By controlling the guide ring profile and radius, the guide ring encloses the blades, improving inlet pressure and airflow in the center of the blades, allowing the airflow direction at the inlet to gradually expand from the guide ring towards the center, thereby improving intake efficiency. At the same time, adopting such overall air duct system parameter design makes the guide ring and fan blade air duct match better, which can ultimately effectively improve the air volume of the air duct system.

[0074] A schematic diagram of the internal structure of the air conditioning unit is shown below. Figures 12 to 15As shown, the air conditioner's overall structure includes an air inlet grille 2, a heat exchanger 4, two fan blades 20, two vortex mechanisms 40, an air duct 1, and a front panel 3. The air inlet grille 2, heat exchanger 4, two fan blades 20, two vortex mechanisms 40, and front panel 3 are fixed together by screws or clips. When the two vortex mechanisms 40 are positioned above the two fan blades 20, the entire unit's air outlet is a bottom-mounted outlet, as shown. Figure 14 As shown. When the two vortex mechanisms 40 are located below the two fan blades 20 respectively, the overall air outlet pattern of the unit is top-mounted air outlet, as shown. Figure 15 As shown. Figure 12 and 13 As shown, the air outlet of the entire unit is vertical, and there are two methods. Method 1: Position the upper volute mechanism 40 above the corresponding fan blade 20 and the lower volute mechanism 40 below the corresponding fan blade 20; the air outlet of the entire unit is vertical. Method 2: Position the upper volute mechanism 40 below the corresponding fan blade 20 and the lower volute mechanism 40 above the corresponding fan blade 20; the air outlet of the entire unit is vertical. Method 2 is the optimal method for vertical air outlet. A schematic diagram of the volute mechanism 40 is shown below. Figure 8 and Figure 9 As shown, state one occurs when the vortex mechanism 40 is above the fan blade, and the airflow exits from below the fan blade. State two occurs when the vortex mechanism 40 is below the fan blade, and the airflow exits from above the fan blade.

[0075] Optionally, the outer peripheral surface of the spiral mechanism 40 is provided with reinforcing ribs.

[0076] In one specific embodiment of this application, such as Figures 3 to 15 As shown, the air duct system includes an air inlet 12, a guide ring 30, a motor 50, a fan blade 20, a volute 10, and an upper air outlet 13, wherein the lower air outlet 14 is closed by a volute mechanism 40. The guide ring 30, motor 50, fan blade 20, and volute 10 are fixed by screw connections. When the motor 50 drives the fan blade 20 to rotate, airflow enters from the air inlet 12, flows through the fan blade 20, and finally exits from the upper air outlet 13. Figure 11As shown, the duct profile includes six straight lines and four curves connected end-to-end. Specifically, the duct profile includes the sixth straight line segment JK, the seventh straight line segment KL, the fourth curve segment LM, the first curve segment MNO, the abrupt straight line segment OP, the second curve segment PQ, the third straight line segment QR, the third curve segment RS, the fourth straight line segment ST, and the fifth straight line segment TU, connected sequentially. The length of the abrupt straight line segment formed by OP is n, with a value ranging from 0 mm to n to 10 mm, and an optimal value of n = 8 mm. ∠OYZ is γ, with a radian value ranging from 1 to γ ​​to 1.3, and an optimal value of γ = 1.13. A polar coordinate system is created with the blade center Y as the pole and the polar axis Z, containing r (radial coordinates) and θ (angular coordinates, radians). The profile equation of the first curve segment MNO is: r = f + g × θ + q × θ 2 Where θ is the independent variable that increases from small to large, and the value of θ in radians ranges from 1.35 ≤ θ ≤ 2π - γ; f, g, and q are constants, where 150 ≤ f ≤ 155, -15 ≤ g ≤ -11, and 0 ≤ q ≤ 5, with optimal values ​​of f = 151.5, g = -11.9, and q = 2.5. The outer diameter of the fan blade is d, and its range is from 100 mm ≤ d ≤ 400 mm, with d = 240 mm; the inner diameter of the fan blade is h = (0.88 ~ 0.92) × d mm, with an optimal value of h = 0.891 × d mm. The duct width is a = (0.42~0.45)×d, with an optimal a = 0.433×d; the fan blade width is b = (0.35~0.4)×d, with an optimal b = 0.392×d; the guide ring diameter is s = (0.85~0.88)×d, with an optimal s = 0.875×d; the gap between the guide ring and the fan blade is c, with a range of 6mm ≤ c ≤ 12mm, where c = 9mm. Designing according to these parameters can effectively reduce broadband abnormal noise in this duct system. Figure 6As shown, the profile of the guide coil 30 includes two smoothly connected straight lines and six arcs. The profile of the guide coil 30 includes, in sequence, a first straight line segment AB, a first arc segment BC, a second arc segment CD, a third arc segment DE, a fourth arc segment EF, a fifth arc segment FG, a sixth arc segment GH, and a second straight line segment HI. The first straight line segment AB is tangent to the first arc segment BC. The second straight line segment HI is tangent to the sixth arc segment GH. The radius of the first arc segment BC is r1 = 0.279 × d. The radius of the second arc segment CD is r2 = 0.276 × d. The radius of the third arc segment DE is r3 = 0.141 × d. The radius of the fourth arc segment EF is r4 = 0.019 × d. The radius of the fifth arc segment FG is r5 = 0.183 × d. The radius of the sixth arc segment GH is r6 = 0.186 × d. All arcs are smoothly connected, meaning the tangents at the connecting endpoints of the arcs coincide. The center of each arc lies on the perpendicular line to the tangent at the endpoint of the arc, and the radius condition is used to determine the center. Based on these parameters, the guide ring surrounds the fan blades. The improved guide ring significantly improves the inlet pressure and airflow in the middle of the fan blades, causing the airflow direction on the inlet side to gradually expand from the periphery of the guide ring towards the center, resulting in a significant improvement in intake efficiency. For example... Figure 16 As shown, this overall duct design optimizes the fit between the guide ring and the fan blades, effectively reducing duct rotation noise, improving inlet pressure, increasing air intake efficiency, and ultimately enhancing the airflow volume of the duct system. Experimental tests show that the improved duct system increases the airflow volume by approximately 6% compared to the original system.

[0077] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

[0078] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0079] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0080] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0081] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0082] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A duct system, characterized in that, include: The volute (10) has a mounting cavity (11) and an air inlet (12) communicating with the mounting cavity (11). Fan blade (20), the fan blade (20) is installed in the mounting cavity (11) and is arranged opposite to the air inlet (12); A guide ring (30) is installed at the air inlet (12); Wherein, the axis of the guide ring (30) is on the same straight line as the axis of the fan blade (20), and the inner diameter s of the guide ring (30) is less than or equal to the inner diameter h of the fan blade (20); The volute (10) also has an upper air outlet (13) and a lower air outlet (14) communicating with the mounting cavity (11). The air duct system also includes: A spiral mechanism (40) is rotatably disposed in the mounting cavity (11), and the spiral mechanism (40) has a first state of closing the upper air outlet (13) and a second state of closing the lower air outlet (14); When the vortex mechanism (40) is in the first state or the second state, the vortex mechanism (40) and the volute (10) together form an air duct, and the projection of the air duct onto a plane perpendicular to the axis of the fan blade (20) forms the profile of the air duct. The profile of the air duct includes stepped line segments, which include a first curved line segment MNO, a sudden straight line segment OP, and a second curved line segment PQ connected in sequence. The length n of the abrupt change line segment OP ranges from 0 mm to 10 mm. <n≤10mm。 2. The air duct system according to claim 1, characterized in that, The relationship between the inner diameter h of the wind vane (20) and the outer diameter d of the wind vane (20) is: h = (0.88~0.92) × d; The relationship between the inner diameter s of the guide ring (30) and the outer diameter d of the fan blade (20) is: s = (0.85~0.88) × d.

3. The air duct system according to claim 1, characterized in that, The projection of the guide ring (30) onto a plane parallel to the axis of the guide ring (30) forms the profile of the guide ring (30). The profile of the guide ring (30) includes a first profile and a second profile symmetrically arranged on both sides of the axis of the guide ring (30). The first profile includes a first straight line segment AB, a first arc segment BC, a second arc segment CD, a third arc segment DE, a fourth arc segment EF, a fifth arc segment FG, a sixth arc segment GH, and a second straight line segment HI connected in sequence. The first straight line segment AB is tangent to endpoint B of the first arc segment BC; the tangent at endpoint C of the first arc segment BC is collinear with the tangent at endpoint C of the second arc segment CD; the tangent at endpoint D of the second arc segment CD is collinear with the tangent at endpoint D of the third arc segment DE; the tangent at endpoint E of the third arc segment DE is collinear with the tangent at endpoint E of the fourth arc segment EF; the tangent at endpoint F of the fourth arc segment EF is collinear with the tangent at endpoint F of the fifth arc segment FG; the tangent at endpoint G of the fifth arc segment FG is collinear with the tangent at endpoint G of the sixth arc segment GH; and the endpoint H of the sixth arc segment GH is tangent to the second straight line segment HI.

4. The air duct system according to claim 3, characterized in that, The relationship between the length L1 of the first straight segment AB and the outer diameter d of the blade (20) is: L1 = (0.15~0.19)×d; the relationship between the radius r1 of the first arc segment BC and the outer diameter d of the blade (20) is: r1 = 0.279×d; the relationship between the radius r2 of the second arc segment CD and the outer diameter d of the blade (20) is: r2 = 0.276×d; the relationship between the radius r3 of the third arc segment DE and the outer diameter d of the blade (20) is: r3 = 0.141×d; the relationship between the radius r3 of the fourth arc segment EF and the outer diameter d of the blade (20) is: r3 = 0.141×d; the relationship between the radius r1 of the fourth arc segment EF and the outer diameter d of the blade (20) is: r1 = 0.279×d; the relationship between the radius r2 of the second arc segment CD and the outer diameter d of the blade (20) is: r2 = 0.276×d; the relationship between the radius r3 of the third arc segment DE and the outer diameter d of the blade (20) is: r3 = 0.141×d; the relationship between the radius r3 of the third arc segment DE and the outer diameter d of the blade (20) is: r3 = 0.141×d; the relationship between the radius r1 of the fourth arc segment EF and the outer diameter d of the blade (20) is: r1 = 0.15~0.19×d; the relationship between the radius r1 ... The relationship between the radius r4 and the outer diameter d of the blade (20) is: r4 = 0.019 × d; the relationship between the radius r5 of the fifth arc segment FG and the outer diameter d of the blade (20) is: r5 = 0.183 × d; the relationship between the radius r6 of the sixth arc segment GH and the outer diameter d of the blade (20) is: r6 = 0.186 × d; the relationship between the length L2 of the second straight segment HI and the outer diameter d of the blade (20) is: L2 = (0.15~0.19) × d.

5. The air duct system according to claim 1, characterized in that, The outer diameter d of the fan blade (20) is in the range of 100mm≤d≤400mm.

6. The air duct system according to claim 1, characterized in that, The gap c between the guide ring (30) and the fan blade (20) is in the range of 6mm≤c≤12mm.

7. The air duct system according to claim 1, characterized in that, The relationship between the width a of the air duct formed by the volute and the outer diameter d of the fan blade (20) is: a = (0.42~0.45) × d; The relationship between the width b of the wind blade (20) and the outer diameter d of the wind blade (20) is: b = (0.35~0.4) × d.

8. The air duct system according to any one of claims 1-7, characterized in that, With the center Y of the wind blade (20) as the pole and the polar axis Z as the polar coordinate system, ∠OYZ is γ, and the range of the radian value of γ is 1≤γ≤1.

3.

9. The air duct system according to any one of claims 1-7, characterized in that, With the center Y of the blade (20) as the pole and a polar coordinate system established with the polar axis Z, the curve equation of the first curve segment MNO is: r = f + g × θ + q × θ 2 , where 1.35≤θ≤2π-γ, 150≤f≤155, -15≤g≤-11, 0≤q≤5.

10. The air duct system according to any one of claims 1-7, characterized in that, The duct profile also includes a third straight segment QR and a third curved segment RS connected in sequence. The third straight segment QR is connected to and tangent to the second curved segment PQ. The first curved segment MNO, the abrupt straight segment OP, the second curved segment PQ, the third straight segment QR, and the third curved segment RS have a similarity of more than 95% to the standard spiral.

11. The air duct system according to any one of claims 1-7, characterized in that, There are multiple volutes (10) and multiple spiral mechanisms (40), with one spiral mechanism (40) provided in each volute (10). When all of the spiral mechanisms (40) are in the first state, the air duct system is in the full bottom air outlet mode; When all of the volute mechanisms (40) are in the second state, the air duct system is in the full top air outlet mode; When one part of the plurality of the spiral mechanisms (40) is in the first state and another part is in the second state, the air duct system is in the up-and-down air outlet mode.

12. The air duct system according to claim 11, characterized in that, The number of the volutes (10) is two, one volute (10) is located at the top and the other volute (10) is located at the bottom; The upper volute (10) also includes a first upper air duct and a first lower air duct communicating with the mounting cavity (11); The lower volute (10) also includes a second upper air duct and a second lower air duct communicating with the mounting cavity (11); After the second upper air duct bends forward, it is arranged in parallel with the first upper air duct. The upper air outlets of the first upper air duct and the upper air outlets of the second upper air duct converge above to form the upper air outlet of the air duct system. The first downdraft bends forward and is arranged side by side with the second downdraft. The downdraft outlets of the first downdraft and the second downdraft converge below to form the downdraft outlet of the duct system. There are two spiral mechanisms (40), and one spiral mechanism (40) is provided in each spiral shell (10).

13. An air conditioner, characterized in that, The air conditioner includes the duct system according to any one of claims 1 to 12.

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