Air conditioner volute tongue, air conditioner indoor unit and air conditioner

Abstract

The utility model discloses an air conditioner volute tongue, an air conditioner indoor unit and an air conditioner in the technical field of air conditioner products. According to the air conditioner volute tongue, a windward face and an air guide face are arranged on a volute tongue body, a plurality of flow guide ribs are arranged in the length direction of the volute tongue body at intervals, flow guide grooves are formed between the adjacent flow guide ribs, and the flow guide ribs are parallel to the cross section of the volute tongue body; and the tail end connecting lines of the plurality of diversion ribs in each group on the windward side are in sine and cosine distribution. Flow guide ribs are arranged on the windward side of the volute tongue, so that return air flow integration is facilitated; the connecting line of the tail ends of the flow guide ribs on the windward side of the volute tongue body is in sine and cosine changes, the speed between the volute tongue and a fan flow channel can be effectively dispersed, pressure distribution is integrated, and disturbance of return air flow to a fan is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning products, in particular to an air-conditioning volute, an air-conditioning indoor unit and an air conditioner. Background Art

[0002] With the rapid development of science and technology and the improvement of people's quality of life, users have higher and higher requirements for household air-conditioning products. They not only require them to have exquisite appearance, but also require that the user experience must be comfortable when the air-conditioning is working. Noise, as an important indicator to measure the user experience when the air-conditioning is running, has also attracted more and more attention. Studies have found that the volute structure and the cross-flow fan have a great impact on the noise when the indoor unit of the air conditioner is running. The existing air-conditioning volute includes a volute body for being set in the indoor unit body and corresponding to the volute. In practice, the volute body includes a windward surface and a wind-guiding surface. The windward surface is the side of the volute body facing the cross-flow fan. The volute body is provided with guide ribs spaced along the length of the volute body. The guide ribs extend across the windward surface and the wind-guiding surface and are parallel to the cross-section of the volute body. The structure of each guide rib is the same. This volute structure has little noise reduction effect during the use of the air conditioner. Moreover, most of the existing cross-flow fans have straight blades. When the speed of the cross-flow fan is too high, not only will the outlet airflow have a significant impact on the volute tongue structure, but the return airflow will also impact the fan blades when passing through the end of the volute tongue body, inducing a sharp whistling sound and reducing the user experience. Utility Model Content

[0003] In order to overcome the technical problem that the existing volute structure inside the air conditioner has a relatively low noise reduction effect, the utility model provides an air conditioner volute, an air conditioner indoor unit and an air conditioner.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The air-conditioning volute tongue has a windward surface and a wind-guiding surface on the volute tongue body. Multiple guide ribs are arranged at intervals in the length direction of the volute tongue body, and guide grooves are formed between adjacent guide ribs. The guide ribs and the cross-section of the volute tongue body are parallel to each other. At least one group of guide ribs is provided on the windward surface, and the end connection lines of multiple guide ribs in each group of guide ribs on the windward surface are distributed in sine and cosine patterns.

[0006] In this application, the guide ribs are set on the windward surface of the volute tongue, which is beneficial to the integration of the return air flow; the connecting line of the end of the guide ribs on the windward surface of the volute tongue body shows a sine and cosine variation, which can effectively disperse the speed between the volute tongue and the fan flow channel, integrate the pressure distribution, and reduce the disturbance of the return air flow to the fan.

[0007] In some embodiments, the extension length of the guide ribs on the windward side is y1, and the extension direction of the tongue body is the x-axis. The distribution of the guide ribs in each group satisfies:

[0008] Where 10≤A1≤15,

[0009] 10≤B1≤15.

[0010] In some embodiments, the width of the guide groove is 1 mm-4 mm.

[0011] In some embodiments, the guide rib extends across the windward surface and the wind guide surface. At the junction of the windward surface and the wind guide surface, the guide rib has the largest depth. The depth of the guide rib gradually decreases in both directions extending toward the windward surface and the wind guide surface at the junction.

[0012] In some embodiments, a line connecting one end of the distal volute tongue body at the maximum depth corresponding to multiple guide ribs in each group of guide ribs is in a sine and cosine distribution.

[0013] In some embodiments, with the maximum depth of the guide ribs as y2 and the extension direction of the tongue body as the x-axis, the distribution of the guide ribs in each group satisfies:

[0014] Where 1≤A2≤5, 1≤B2≤5.

[0015] Furthermore, with the extension length of the guide rib on the windward side as y1 and the extension direction of the volute tongue as the x-axis, the distribution of the guide ribs in each group satisfies:

[0016] Where 10≤A1≤15,

[0017] 10≤B1≤15;

[0018] The distribution of the internal guide ribs of each group satisfies: ω1 = ω2, and in the extension direction of the snail tongue body, the points corresponding to the maximum values ​​of y1 and y2 are consistent.

[0019] The utility model also provides an air-conditioning indoor unit, comprising the air-conditioning volute described in any of the above embodiments, and further comprising a casing and a cross-flow fan. The side of the volute body close to the cross-flow fan is the windward surface, and the cross-flow fan is composed of multiple oblique blades.

[0020] In some embodiments, the length of each oblique blade in the cross-flow fan is 46 mm-50 mm, and the stagger angle of the oblique blade is 2.5°-4.9°.

[0021] The utility model also provides an air conditioner, comprising the above-mentioned air conditioner indoor unit.

[0022] The beneficial effects of the utility model are:

[0023] 1. Arranging guide ribs on the windward surface of the volute tongue body is beneficial to integrating the return air flow; the connecting line of the guide ribs at the end of the windward surface changes in sine and cosine, which can effectively disperse the speed between the volute tongue and the fan flow channel, integrate the pressure distribution, and reduce the disturbance of the return air flow to the fan; and in the axial direction, the depth of the guide ribs changes, and the gap between the volute tongue body and the cross-flow fan is in a changing state. The guide ribs with a small gap from the cross-flow fan can cut the airflow first, and the guide ribs with a large gap from the cross-flow fan can cut the return airflow later, preventing the volute tongue body structure from cutting the airflow at the same time, reducing the intensity of the cutting airflow, and helping to improve the howling.

[0024] 2. Use multi-section fans, each section of which can correspond to one or more guide rib periodic tooth numbers. Each section of the fan corresponds to multiple varying tooth depths and guide rib windward surface heights, which can further disperse the intensity of the volute tongue cutting the airflow and reduce the intensity of high-frequency noise.

[0025] 3. Compared with the original fan, the oblique fan blades can greatly increase the air volume at the same speed; and at the same air volume, the lower the fan speed, the more conducive to reducing the air conditioner whistling sound; and the blades of the fan with oblique fan blades have a certain curvature, which helps to diffuse the wind and make the wind softer. Therefore, matching the oblique fan blades with the snail tongue body with the aforementioned sine and cosine distributed guide ribs is beneficial to reducing the decibel value of high-frequency noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the air duct cross section of the air conditioner indoor unit provided by the utility model;

[0027] Figure 2 for Figure 1 A partial enlarged view of

[0028] Figure 3 for Figure 1 Schematic cross-section of the tongue of the middle snail;

[0029] Figure 4 for Figure 3 A partial enlarged view of

[0030] Figure 5 for Figure 1 A schematic structural diagram of another embodiment of the middle snail tongue body;

[0031] Figure 6 for Figure 1 A schematic structural diagram of another embodiment of the middle snail tongue body;

[0032] Figure 7 for Figure 1 A schematic structural diagram of another embodiment of the middle snail tongue body;

[0033] Figure 8 for Figure 1 Schematic diagram of the structure of the air conditioner indoor unit after switching the viewing angle;

[0034] Figure 9 for Figure 1 Noise spectra of the snail tongue structure in two states: with straight blades and with oblique blades;

[0035] Figure 10 A comparison chart of the speed and air volume of the original volute tongue body with straight blades and the volute tongue body of the utility model with inclined blades.

[0036] Marked in the figure are, 1-cross-flow fan, 2-housing, 3-volute tongue body, 31-windward surface, 32-wind guide surface, 33-guide rib, 4-oblique fan blade. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] like Figures 1-10 As shown, the utility model provides an air-conditioning indoor unit.

[0040] The indoor unit of the air conditioner comprises a casing 2 in which a cross-flow fan 1 and an air conditioner volute are arranged.

[0041] The air conditioning volute has a windward surface 31 and a wind guide surface 32 on the volute body 3. A plurality of guide ribs 33 are arranged at intervals in the length direction of the volute body 3. A guide groove is formed between adjacent guide ribs 33. The cross sections of the guide ribs 33 and the volute body 3 are parallel to each other. At least one group of guide ribs 33 is provided on the windward surface 31. The end connection lines of the multiple guide ribs 33 in each group of guide ribs 33 on the windward surface 31 are distributed in a sine and cosine pattern.

[0042] In the present application, the guide ribs 33 are provided on the windward surface 31 of the volute tongue, which is beneficial to the integration of the return air flow; the end connection line of the guide ribs 33 on the windward surface 31 of the volute tongue body 3 shows a sine and cosine variation, which can effectively disperse the speed between the volute tongue and the fan flow channel, integrate the pressure distribution, and reduce the disturbance of the return air flow to the fan.

[0043] Here, a group of guide ribs 33 is a guide rib 33 of a sine-cosine cycle. Figure 2-Figure 7 , and does not limit the guide ribs 33 to be exactly an integer group.

[0044] Reference Figure 1The windward surface 31 is the side of the volute body 3 that faces the cross-flow fan 1 when used in an air conditioner indoor unit; the wind-guiding surface 32 is the side of the volute body 3 that faces away from the cross-flow fan 1. A curved arc transition forms between the windward surface 31 and the wind-guiding surface 32, with a radius of 0 mm to 7 mm. In this embodiment, the guide ribs 33 also form a curved transition at the junction of the windward surface 31 and the wind-guiding surface 32.

[0045] The guide rib 33 and the cross section of the volute tongue body 3 are parallel to each other, that is, the length extension direction of the guide rib 33 on the windward surface 31 and the depth extension direction perpendicular to the windward surface 31 are both parallel to the cross section of the volute tongue body 3. Similarly, the guide rib 33 at the intersection of the windward surface 31 and the wind guide surface 32 and the extension direction of the guide rib 33 on the wind guide surface 32 can be obtained.

[0046] In this embodiment, the extension length of the guide ribs 33 on the windward surface 31 is y1, and the extension direction of the tongue body 3 is the x-axis. The distribution of the guide ribs 33 in each group satisfies:

[0047] Where 10≤A1≤15,

[0048] 10≤B1≤15.

[0049] In practice, when A1>B1, the value of y1 may be negative. In this case, the curve segment with a positive value of y1 should be used as a reference for arranging the extension length of the guide rib 33. As an option, A1≤B1 can also be selected during the design.

[0050] Although only the aforementioned sine formula is mentioned here, based on the convertibility of sine waves and cosine waves, it is generally said that the end connection line of the plurality of guide ribs 33 in each group of guide ribs 33 on the windward surface 31 is in a sine-cosine distribution.

[0051] In this embodiment, the width of the guide groove is 1 mm to 4 mm. The guide groove width is the distance between adjacent guide ribs 33. Under the premise of the above-mentioned sine and cosine formulas, the number of guide ribs 33 in a cycle is related to the guide groove width.

[0052] In this embodiment, the guide rib 33 extends across the windward surface 31 and the wind guide surface 32. At the junction of the windward surface 31 and the wind guide surface 32, the depth of the guide rib 33 is the largest. At the junction, the depth of the guide rib 33 gradually decreases in both directions extending toward the windward surface 31 and toward the wind guide surface 32.

[0053] Reference Figure 2As shown, the extension length of the guide ribs 33 on the windward surface 31 is constantly changing, specifically following the aforementioned sine and cosine formulas. However, the extension length on the windward surface 32 remains consistent, meaning that the ends of the guide ribs 33 are flush and aligned on the same straight line on the windward surface 32, ensuring that the gas flowing out of the guide grooves on the guide surface remains consistent.

[0054] In this embodiment, the line connecting the points of maximum depth corresponding to the multiple guide ribs 33 in each group of guide ribs 33, distal to the end of the tongue body 3, exhibits a sine and cosine distribution. This allows the depth of the guide ribs 33 to vary in the axial direction, and the gap between the tongue body 3 and the cross-flow fan 1 to change. Guide ribs 33 with a smaller gap from the cross-flow fan 1 can cut the airflow first, while guide ribs 33 with a larger gap from the cross-flow fan 1 can cut the return airflow later. This prevents the tongue body 3 from cutting the airflow simultaneously, reduces the intensity of the cut airflow, and helps to reduce whistling.

[0055] Please refer to Figure 2 and Figure 4 , it can be seen that the extension lengths of the guide ribs 33 on the windward surface 31 are different, and the maximum depths of the guide ribs 33 are different.

[0056] In this embodiment, the maximum depth of the guide ribs 33 is y2, and the extending direction of the tongue body 3 is the x-axis. The distribution of the guide ribs 33 in each group satisfies:

[0057] Where 1≤A2≤5, 1≤B2≤5.

[0058] In practice, when A2>B2, the value of y2 may be negative. In this case, the curve segment with a positive y2 value should be used as a reference for the maximum depth of the guide rib 33. As an option, A2≤B2 can also be selected during the design.

[0059] In combination with the above, the extension length of the guide rib 33 on the windward surface 31 is y1, and the extension direction of the volute tongue body 3 is the x-axis. The distribution of the guide ribs 33 in each group satisfies:

[0060] Where 10≤A1≤15,

[0061] 10≤B1≤15;

[0062] The distribution of the internal guide ribs 33 within each group satisfies the following relationship: ω1 = ω2, and the points corresponding to the maximum values ​​of y1 and y2 coincide with each other along the extension direction of the tongue body 3. In practice, the points corresponding to the maximum values ​​of y1 and y2 may not be provided with guide ribs 33. The emphasis here is on ensuring that the extension length of each group of internal guide ribs 33 on the windward surface 31 and the periodic variation of the maximum depth of the guide ribs 33 are consistent, with the peaks occurring on the same guide rib 33. This not only improves noise reduction but also facilitates manufacturing.

[0063] Referring to Figure 5-Figure 7 The utility model also provides different embodiments of the length of the guide ribs 33 extending on the windward surface 31. In the following embodiments, the motor end and the bearing end are taken as the two ends of the volute tongue body 3.

[0064] For example, Figure 5 In the embodiment, the gap between the teeth remains unchanged from the motor end, the number of guide ribs 33 (hereinafter referred to as teeth) in different periods is different, the tooth depth of the shallowest tooth is 0 mm, and the tooth depth of the deepest tooth is 3 mm. Specifically, the number of volute tongue teeth in the first period is set to 13, the number of volute tongue teeth in the second period is set to 15, the number of volute tongue teeth in the third period is set to 17, and so on. The number of volute tongue teeth in the nth1 period is 13+2(n1-1), and n1≥1.

[0065] For example, Figure 6 In the embodiment, the gap between the teeth remains unchanged from the motor end, the number of guide ribs 33 (hereinafter referred to as teeth) in different periods is different, the tooth depth of the shallowest tooth is 0 mm, and the tooth depth of the deepest tooth is 3 mm. Specifically, the number of volute tongue teeth in the first period is set to 13, the number of volute tongue teeth in the second period is set to 15, the number of volute tongue teeth in the third period is set to 17, and so on. The number of volute tongue teeth in the nth1 period is 13+2(n1-1), and n1≥1.

[0066] For example, in some embodiments, the gap between the teeth remains unchanged from the middle position of the volute tongue body 3 in the extension direction, the number of guide ribs 33 corresponding to different periods is different, the tooth depth of the shallowest tooth is 0 mm, and the tooth depth of the deepest tooth is 3 mm. Specifically, the number of volute tongue teeth from the middle starting position of the volute tongue body 3 to the motor end in the first period is set to 1, the number of volute tongue teeth in the second period is set to 3, the number of volute tongue teeth in the third period is set to 5, and so on. The number of volute tongue teeth in the nth3 period is 2n3-1, and n3≥1. The arrangement of the volute tongue teeth from the middle starting position of the volute tongue body 3 to the bearing end is symmetrical to the arrangement of the volute tongue teeth from the middle starting position of the volute tongue body 3 to the motor end, and the symmetry point is the middle starting position of the volute tongue body 3.

[0067] For example, Figure 7In the figure, the middle position of the extension direction of the volute tongue body 3 is taken as the starting point, the gap between the teeth remains unchanged, the number of guide ribs 33 corresponding to different periods is different, the shallowest tooth depth is 0mm, and the deepest tooth depth is 3mm. Specifically, the number of volute tongue teeth in the first period from the middle starting position of the volute tongue body 3 to the motor end is set to 15, the number of volute tongue teeth in the second period is set to 13, the number of volute tongue teeth in the third period is set to 11, and so on. The number of volute tongue teeth in the n4th period is 15-2(n4-1), and n4≥1. In addition, the arrangement of the number of volute tongue teeth from the middle starting position of the volute tongue body 3 to the bearing end is symmetrical to the arrangement of the teeth from the starting position of the volute tongue body 3 to the motor end, and the symmetrical point is the middle starting position of the volute tongue body 3.

[0068] The aforementioned embodiments demonstrate that the number of teeth per cycle can vary. When using a multi-section fan, each section can correspond to one or more tooth numbers per guide rib 33 cycle. Each section can also correspond to varying tooth depths and windward rib 33 heights, i.e., the aforementioned y2 and y1. This can further disperse the intensity of the airflow cut by the volute tongue body 3, reducing high-frequency noise.

[0069] In this embodiment, Figure 8 As shown, the cross-flow fan 1 is composed of multiple slanted blades 4. Each slanted blade 4 in the cross-flow fan 1 is 46mm-50mm long, and the stagger angle of the slanted blades 4 is 2.5°-4.9°. In this embodiment, the outer diameter of the slanted blades 4 is 108mm, and the distance between the end of the guide rib 33 on the windward surface 31 of the volute body 3 and the outer diameter of the cross-flow fan 1 is controlled to be 5mm-8mm.

[0070] like Figure 9 The figure shows the noise spectra of the snail tongue body 3 structure in this embodiment in two states: with straight blades and with oblique blades 4. This figure is an FFT noise spectrum diagram, with the horizontal axis representing the noise frequency and the vertical axis representing the noise decibel value. The green curve represents the original state - that is, the state with straight blades, and the red curve represents the state with oblique blades 4. From the spectrum diagram, it can be seen that the green curve has multiple cusps between 1000 Hz and 1600 Hz, indicating that the original air duct has high-frequency whistling sounds, while the red curve eliminates the cusps near 1000 Hz-1600 Hz, and the overall cusp value of the red curve is lower than that of the green curve, indicating that the improved air duct effectively eliminates high-frequency whistling sounds.

[0071] Figure 10A speed-air volume comparison diagram of the original volute tongue body 3 combined with straight fan blades and the volute tongue body 3 of the present invention combined with oblique fan blades 4 is shown. By comparison, it can be found that after the improvement, compared with the original state, the cross-flow fan 1 in this embodiment can greatly increase the air volume value at the same speed. At the same air volume, the lower the fan speed, the more conducive to reducing the air-conditioning whistling sound; and the blades of the fan with oblique fan blades 4 have a certain curvature, which helps to diffuse the wind and make the wind softer. Therefore, combining the oblique fan blades 4 with the volute tongue body 3 structure provided in this application is conducive to further reducing the decibel value of high-frequency noise.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An air conditioning volute, wherein a volute body (3) is provided with a windward surface (31) and a wind guide surface (32), a plurality of guide ribs (33) are arranged at intervals along the length direction of the volute body (3), a guide groove is formed between adjacent guide ribs (33), and the cross sections of the guide ribs (33) and the volute body (3) are parallel to each other, wherein: At least one group of guide ribs (33) is provided on the windward surface (31), and the connecting lines of the ends of the plurality of guide ribs (33) in each group of guide ribs (33) on the windward surface (31) are in a sine and cosine distribution.

2. The air conditioner volute according to claim 1, characterized in that: With the extension length of the guide rib (33) on the windward surface (31) as y1 and the extension direction of the volute tongue body (3) as the x-axis, the distribution of the guide ribs (33) in each group satisfies: Where 10≤A1≤15, 10≤B1≤15。 3. The air conditioner volute according to claim 1, characterized in that: The width of the guide groove is 1mm-4mm.

4. The air conditioner volute according to any one of claims 1 to 3, characterized in that: The guide rib (33) extends across the windward surface (31) and the wind guide surface (32). The depth of the guide rib (33) is the greatest at the junction of the windward surface (31) and the wind guide surface (32). The depth of the guide rib (33) gradually decreases in both directions of extending toward the windward surface (31) and toward the wind guide surface (32) at the junction.

5. The air conditioner volute according to claim 4, characterized in that: The connecting line of one end of the distal volute tongue body (3) at the maximum depth corresponding to the plurality of guide ribs (33) in each group of guide ribs (33) is in a sine and cosine distribution.

6. The air conditioning volute according to claim 5, characterized in that: With the maximum depth of the guide rib (33) as y2 and the extension direction of the volute tongue body (3) as the x-axis, the distribution of the guide ribs (33) in each group satisfies: Where 1≤A2≤5, 1≤B2≤5.

7. The air conditioning volute according to claim 6, characterized in that: With the extension length of the guide rib (33) on the windward surface (31) as y1 and the extension direction of the volute tongue body (3) as the x-axis, the distribution of the guide ribs (33) in each group satisfies: Where 10≤A1≤15, 10≤B1≤15； The distribution of each group of internal guide ribs (33) satisfies: ω1=ω2, and in the extension direction of the snail tongue body (3), the points corresponding to the maximum values ​​of y1 and y2 are consistent.

8. An air conditioner indoor unit, characterized in that: The invention comprises an air-conditioning volute as described in any one of claims 1 to 7, and further comprises a casing and a cross-flow fan (1), wherein the side of the volute body (3) close to the cross-flow fan (1) is a windward surface (31), and the cross-flow fan (1) is composed of a plurality of oblique blades (4).

9. The air conditioner indoor unit according to claim 8, wherein: The length of each oblique blade (4) in the cross-flow fan (1) is 46 mm to 50 mm, and the staggered angle of the oblique blade (4) is 2.5° to 4.9°.

10. An air conditioner, characterized in that It comprises the air-conditioning indoor unit as described in claim 8 or 9.

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