Bionic volute tongue and air conditioner

Abstract

The invention provides a bionic volute tongue and an air conditioner. The bionic volute tongue comprises a volute tongue backflow area and a volute tongue fillet which are connected in sequence, and a plurality of fins are arranged on the side, close to a cross-flow fan, of the bionic volute tongue; in the extending direction of the bionic volute tongue from the volute tongue backflow area to the volute tongue fillet, the surface area of any fin located at the volute tongue fillet is smaller than that of any fin located at the volute tongue backflow area; bionic structure improvement is carried out on the side, close to the cross-flow fan blade, of the volute tongue, bionic is carried out according to the feather distribution condition in biological field wings, the bionic volute tongue can fully disperse impact airflow at the volute tongue, the rotation fundamental frequency generated when the airflow impacts the volute tongue is effectively dispersed, superposition of same-frequency noise is prevented, and the noise reduction effect is achieved. Rotation noise of the air conditioner can be effectively reduced, and the noise reduction effect of the volute tongue is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a bionic volute tongue and an air conditioner, in particular to a bionic volute tongue and an air conditioner for a cross-flow fan. Background Art

[0002] Air conditioners are indispensable electrical appliances in people's daily lives and have a variety of structural forms. With the continuous improvement of industrial design level and the application of new processes, new materials and new shapes in air conditioners, not only a variety of air conditioners have been developed, but also the corresponding structural optimization of each component of the air conditioner has been carried out.

[0003] Taking the indoor unit of a conventional air conditioner (such as a wall mounted unit, cabinet unit, etc.) as an example, most of them use crossflow blades. In order to prevent the airflow from circulating in the volute, a volute tongue is generally designed at the reflux point of the volute at the air outlet. However, the airflow from the crossflow blade often hits the volute tongue periodically, which easily leads to the generation of rotational noise. In order to solve this noise problem, the air conditioner volute tongue is usually made of inclined volute tongue, sawtooth volute tongue, etc. to improve the rotational noise, but the noise reduction effect is relatively poor. Summary of the invention

[0004] In view of this, the present invention aims to propose a bionic volute tongue and an air conditioner to solve the problems of high rotation noise and poor noise reduction effect of the volute tongue in the air conditioner in the prior art.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A bionic volute tongue comprises a volute tongue reflow zone and a volute tongue fillet connected in sequence, wherein the bionic volute tongue is provided with a plurality of fins on a side close to a crossflow fan blade; in the bionic volute tongue extending direction from the volute tongue reflow zone to the volute tongue fillet, the surface area of ​​any fin located at the volute tongue fillet is smaller than the surface area of ​​any fin located at the volute tongue reflow zone. Furthermore, in the bionic volute tongue extending direction from the volute tongue reflow zone to the volute tongue fillet, the distribution density of the fins located at the volute tongue fillet is greater than the distribution density of the fins located at the volute tongue reflow zone. Thus, the present application improves the bionic structure on the side of the volute tongue close to the crossflow fan blade, and uses the distribution of feathers in the wings of the biological world for bionics, so that the number of fins near the volute tongue fillet is large and small, and the volute tongue fillet is used as the impact point of the volute tongue airflow. The bionic volute tongue of the present application can fully disperse the impact airflow at the volute tongue, effectively disperse the rotational fundamental frequency generated by the airflow impacting the volute tongue, prevent the superposition of noises with the same frequency, effectively reduce the rotational noise of the air conditioner, and improve the noise reduction effect of the volute tongue.

[0007] Furthermore, for any two adjacent winglets, on any cross section of the bionic volute tongue, the winglet on the reference side away from the bionic volute tongue is higher than the winglet on the reference side close to the bionic volute tongue. Therefore, the present application improves the bionic structure on the side of the volute tongue close to the crossflow fan blade, and there is a height difference between the two adjacent winglets, so that the winglets of the bionic volute tongue of the present application present a step-by-step height gradient in the extension direction, and the height of each layer of winglets is getting higher and higher, which makes the flow space of the airflow gradually increase and the flow resistance continuously decrease in the process of the airflow returning to the reflow channel between the bionic volute tongue and the crossflow fan blade. This is conducive to increasing the reflow amount of the reflow channel between the bionic volute tongue and the crossflow fan blade under the premise of a certain minimum gap between the volute tongue reflow area and the crossflow fan blade, and can improve the surge phenomenon of the crossflow fan blade.

[0008] Furthermore, the winglets include a large winglet, a middle winglet, and a small winglet. On any cross section of the bionic snail tongue, the snail tongue fillet is provided with at least one small winglet. Thus, the distribution of feathers in the wings of the biological world is utilized for bionics, so that the number of winglets near the snail tongue fillet is large and small. The snail tongue fillet serves as the impact point of the snail tongue airflow. The bionic snail tongue of the present application can fully disperse the impact airflow at the snail tongue, effectively disperse the rotational fundamental frequency generated by the airflow impacting the snail tongue, prevent the superposition of noises with the same frequency, effectively reduce the rotational noise of the air conditioner, and improve the noise reduction effect of the snail tongue.

[0009] Furthermore, on any cross section of the bionic volute tongue, in the direction away from the reference side of the bionic volute tongue, the volute tongue recirculation area is sequentially provided with at least one large wing and at least one middle wing. Thus, in the process of the airflow recirculating into the recirculation channel between the bionic volute tongue and the crossflow fan blade, the flow space of the airflow gradually increases and the flow resistance continuously decreases, which is conducive to increasing the recirculation amount of the recirculation channel between the bionic volute tongue and the crossflow fan blade under the premise of a certain minimum gap between the volute tongue recirculation area and the crossflow fan blade, and can improve the surge phenomenon of the crossflow fan blade.

[0010] Furthermore, any one of the winglets has at least one arc line at the end away from the reference side, and the arc line includes an arc top line and an arc shoulder line, and the two ends of the arc top line are respectively connected to the arc shoulder line in a smooth transition manner; for any two adjacent winglets, the winglet forms an arc top drop portion between the winglet and its adjacent winglet at the arc top line, and the winglet forms an arc shoulder drop portion between the winglet and its adjacent winglet at the arc shoulder line. For any one of the winglets, the height of the arc top drop portion is greater than the height of the arc shoulder drop portion. Therefore, with the two spatial drop distribution structures existing in one winglet, a certain airflow can be dispersed into at least three flow directions when flowing through any one of the winglets, thereby improving the dispersion degree of the airflow, further dispersing the rotational fundamental frequency generated by the airflow impacting the volute tongue, preventing the superposition of noises of the same frequency, and effectively reducing the rotational noise of the air conditioner, thereby improving the noise reduction effect of the volute tongue.

[0011] Furthermore, the height of the arc top drop of the large wing is greater than the height of the arc top drop of the middle wing and greater than the height of the arc top drop of the small wing, and the height of the arc shoulder drop of the large wing is greater than the height of the arc shoulder drop of the middle wing and greater than the height of the arc shoulder drop of the small wing. As a result, in the process of airflow flowing into the reflow channel, the flow space of the airflow gradually increases and the flow resistance continues to decrease. This is conducive to increasing the reflow volume of the reflow channel between the bionic volute tongue and the crossflow fan blade under the premise of a certain minimum gap between the reflow area of ​​the volute tongue and the crossflow fan blade, and can improve the surge phenomenon of the crossflow fan blade.

[0012] Furthermore, the height difference between the arc top drop part and the arc shoulder drop part of the large wing is greater than the height difference between the arc top drop part and the arc shoulder drop part of the middle wing, and the height difference between the arc top drop part and the arc shoulder drop part of the small wing. Therefore, in the process of airflow flowing into the reflow channel, the difference in spatial drop faced by the airflow when flowing through the same winglet continues to increase, so that the airflow can flow to the next winglet at a higher speed, which is helpful to avoid local flow blockage of the airflow to a certain extent, and is helpful to further increase the reflow amount of the reflow channel between the bionic volute tongue and the crossflow fan blade, which can further improve the surge phenomenon of the crossflow fan blade.

[0013] An air conditioner comprises a volute, a crossflow fan blade and a bionic volute tongue, wherein the crossflow fan blade is installed in the volute, the bionic volute tongue is arranged on a base, and the bionic volute tongue is located at the air outlet side of the crossflow fan blade.

[0014] Compared with the prior art, the bionic snail tongue and air conditioner described in the present invention have the following advantages:

[0015] The bionic volute tongue and air conditioner described in the present invention improve the bionic structure on the side of the volute tongue close to the crossflow fan blade, and use the distribution of feathers in the wings of the biological world for bionics, so that the number of winglets near the rounded corners of the volute tongue is large and small. The rounded corners of the volute tongue serve as the impact point of the airflow of the volute tongue. The bionic volute tongue of the present application can fully discretize the impact airflow at the volute tongue, effectively disperse the rotational fundamental frequency generated by the airflow impacting the volute tongue, prevent the superposition of noise of the same frequency, effectively reduce the rotational noise of the air conditioner, and improve the noise reduction effect of the volute tongue.

[0016] In addition, there is a height difference between two adjacent winglets in the extension direction of the bionic volute tongue of the present application, so that the winglets present a step-by-step height gradient, and the height of each layer of winglets becomes higher and higher. This makes the flow space of the airflow gradually increase and the flow resistance continue to decrease during the process of the airflow flowing back into the reflow channel between the bionic volute tongue and the crossflow fan blade. Under the premise that the minimum gap between the reflow zone of the volute tongue and the crossflow fan blade is constant, this is conducive to increasing the reflow amount of the reflow channel between the bionic volute tongue and the crossflow fan blade, and can improve the surge phenomenon of the crossflow fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the air conditioner at the snail tongue in the prior art;

[0019] Figure 2 This is a schematic structural diagram of a bionic snail tongue according to an embodiment of the present invention;

[0020] Figure 3 For the embodiment of the present invention Figure 2 A partial enlarged view of the center

[0021] Figure 4 It is a schematic structural diagram of a bionic snail tongue according to an embodiment of the present invention from another viewing angle;

[0022] Figure 5 For the embodiment of the present invention Figure 4 A partial enlarged view of point B in the middle;

[0023] Figure 6 For the embodiment of the present invention Figure 5 A partial enlarged view of point C in the middle;

[0024] Figure 7 This is a schematic diagram of simulated local flow of a bionic volute tongue described in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Snail tongue; 11. Reference side; 2. Snail tongue recirculation area; 3. Snail tongue fillet; 4. Large wing; 5. Middle wing; 6. Small wing; 6a. End small wing; 7. Crossflow fan blade; 8. Arc top drop; 81. Arc top line; 9. Arc shoulder drop; 91. Arc shoulder line. DETAILED DESCRIPTION

[0027] The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the essence of their work to other persons skilled in the art. However, these inventive concepts can be embodied in many different forms and should not be considered limited to the embodiments described herein.

[0028] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. Figure 2, the two directional terms in the present application are explained, "extension direction" refers to the extension direction of the bionic snail tongue from the snail tongue reflow area 2 to the snail tongue fillet 3, which can be regarded as the extension direction of the main structure of the bionic snail tongue from point M to point N with the reference side 11 as the reference; "longitudinal" can be intuitively understood as the direction of the bionic snail tongue as a whole in its length, which is the same as the understanding of the length and width of the conventional snail tongue by people in this field.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0030] Attached Figure 1 The schematic diagram of the structure of the existing air conditioner at the volute tongue 1 is shown in FIG. The volute tongue 1 includes a volute tongue recirculation area 2 and a volute tongue fillet 3 connected in sequence. There is a certain gap between the volute tongue recirculation area 2 and the outer periphery of the crossflow fan blade 7, and the existing technology limits the minimum value of this gap, such as about 3.5 mm, so that the crossflow fan blade recirculation area can have a certain amount of return air. However, the existing technology often has the problem of large rotation noise and poor noise reduction effect of the volute tongue.

[0031] In order to solve the problems of high rotation noise and poor noise reduction effect of the volute tongue in the air conditioner in the prior art, this embodiment proposes a bionic volute tongue, which also includes a volute tongue reflow area 2 and a volute tongue fillet 3 connected in sequence, which is similar to the prior art and will not be elaborated herein.

[0032] Compared with the prior art, the focus of the present application is that the bionic volute tongue is improved on the side close to the crossflow fan blade 7 by bionic structure, as shown in the attached Figure 2-6 As shown, the bionic volute tongue is provided with a plurality of fins on one side close to the crossflow fan blade 7; in the extension direction of the bionic volute tongue from the volute tongue recirculation area 2 to the volute tongue fillet 3, the surface area of ​​any fin located at the volute tongue fillet 3 is smaller than the surface area of ​​any fin located at the volute tongue recirculation area 2; in addition, as a preferred embodiment of the present application, taking the reference side 11 of the bionic volute tongue as the comparison reference, on any cross section of the bionic volute tongue (it should be noted that the “cross section” is the attached Figure 1 As shown in the cross section, or regarded as a cross section parallel to the “extension direction”), for any two adjacent fins, the surface area of ​​the fin away from the reference side 11 is smaller than the surface area of ​​the fin close to the reference side 11.

[0033] In the bionic volute tongue extension direction from the volute tongue reflow area 2 to the volute tongue fillet 3, the distribution density of the winglets located at the volute tongue fillet 3 is greater than the distribution density of the winglets located at the volute tongue reflow area 2; in addition, as a preferred embodiment of the present application, the distribution density of the winglets gradually increases in the bionic volute tongue extension direction from the volute tongue reflow area 2 to the volute tongue fillet 3. With reference to the layer-by-layer distribution of feathers in a wing, it can be understood that: in the bionic volute tongue extension direction from the volute tongue reflow area 2 to the volute tongue fillet 3, the winglet distribution density of the winglet layer far from the reference side 11 is greater than the winglet distribution density of the winglet layer close to the reference side 11. The distribution density can be regarded as the number of winglets per unit area.

[0034] Therefore, the present application improves the bionic structure on the side of the volute tongue close to the crossflow fan blade 7, and uses the distribution of feathers in the wings of the biological world for bionics, so that the number of winglets near the fillet 3 of the volute tongue is large and small. The fillet 3 of the volute tongue serves as the impact point of the volute tongue airflow. The bionic volute tongue of the present application can fully discretize the impact airflow at the volute tongue, effectively disperse the rotational fundamental frequency generated by the airflow impacting the volute tongue, prevent the superposition of noise of the same frequency, effectively reduce the rotational noise of the air conditioner, and improve the noise reduction effect of the volute tongue.

[0035] For any two adjacent winglets, on any cross section of the bionic snail tongue, in the extension direction of the bionic snail tongue, the winglet far from the bionic snail tongue reference side 11 is higher than the winglet close to the bionic snail tongue reference side 11, that is, in the extension direction of the bionic snail tongue, there is a height difference between any two adjacent winglets, and the height of the winglets will gradually increase.

[0036] In order to avoid ambiguity, it should be noted that the "height" and "height difference" in this application cannot be fully understood as the conventional horizontal plane height difference because the snail tongue has a certain curved section. It can be understood as the difference in height between any two adjacent winglets at the junction, especially referring to the spatial difference in height between the two winglets at the junction (local position).

[0037] Therefore, in the extension direction of the bionic volute tongue of the present application, there is a height difference between two adjacent winglets, so that the winglets present a step-by-step height gradient, and the height of each layer of winglets becomes higher and higher. This makes the flow space of the airflow gradually increase and the flow resistance continuously decrease during the process of the airflow returning into the reflow channel between the bionic volute tongue and the crossflow fan blade 7. Under the premise that the minimum gap between the volute tongue reflow zone 2 and the crossflow fan blade 7 is constant, it is beneficial to increase the reflow amount of the reflow channel between the bionic volute tongue and the crossflow fan blade 7, and can improve the surge phenomenon of the crossflow fan blade.

[0038] Since the surface area of ​​the winglets gradually decreases when compared with adjacent winglets along the extension direction of the bionic volute tongue, for the convenience of description and intuitive understanding, the present application divides the winglets into a large wing 4, a middle wing 5, and a small wing 6.

[0039] On any cross section of the bionic snail tongue, in the direction away from the reference side (11) of the bionic snail tongue, the snail tongue recirculation zone 2 is sequentially provided with at least one large wing 4 and at least one middle wing 5; due to the irregularity of feather distribution in the wings of the biological world, and can be regarded as layer-by-layer distribution, along the extension direction of the bionic snail tongue, the bionic snail tongue in the present application can be provided with at least one large wing layer and at least one middle wing layer in the snail tongue recirculation zone 2, and the sum of the lengths of all large wing layers occupied in the snail tongue recirculation zone 2 is less than the sum of the lengths of all middle wing layers occupied in the snail tongue recirculation zone 2. Preferably, as shown in the attached Figure 2-5 As shown, in the present application, the bionic volute tongue is provided with one large wing layer and two middle wing layers in the volute tongue reflow zone 2 .

[0040] In any cross section of the bionic volute tongue, along the extension direction of the bionic volute tongue, the volute tongue fillet 3 is sequentially provided with at least one winglet 6; that is, along the extension direction of the bionic volute tongue, the bionic volute tongue in the present application can be provided with at least one winglet layer at the volute tongue fillet 3. Preferably, as shown in the attached Figure 2-5 As shown, in the present application, the bionic snail tongue is provided with 3-4 winglet layers at the fillet 3 of the snail tongue.

[0041] Therefore, if the bionic volute tongue is divided into regions simply and intuitively, the side of the volute tongue fillet 3 close to the crossflow blade 7 can be recorded as the small wing area, and the side of the volute tongue recirculation area 2 close to the crossflow blade 7 can be divided into a large wing area and a middle wing area, and the middle wing area is located between the large wing area and the small wing area. Correspondingly, the large wing area is closest to the reference side 11.

[0042] Refer to the common shapes of feathers in the wings of living things, such as the attached Figure 3 , 5 As shown, any wing of the present application has at least one arc line at the end away from the reference side 11. For the convenience of subsequent description, the arc lines are respectively recorded as an arc top line 81 and two arc shoulder lines 91. The two ends of the arc top line 81 are respectively connected to the arc shoulder lines 91 in a smooth transition manner to form a complete arc line.

[0043] For any two adjacent fins, the fin forms an arc top drop portion 8 between the fin and its adjacent fin at the arc top line 81, and forms an arc shoulder drop portion 9 between the fin and its adjacent fin at the arc shoulder line 91. For any fin, the height of the arc top drop portion 8 is greater than the height of the arc shoulder drop portion 9. Thus, with the two spatial drop distribution structures existing in one fin, a certain airflow can be dispersed into at least three flow directions when flowing through any fin, which improves the dispersion degree of the airflow, can further disperse the rotational fundamental frequency generated by the airflow impacting the volute tongue, prevent the superposition of noises with the same frequency, can effectively reduce the rotational noise of the air conditioner, and improve the noise reduction effect of the volute tongue.

[0044] Among them, the "height of the arc top drop portion 8" is the drop value between the two wing pieces bordered by the arc top line 81 at the local position of the arc top line 81, and the "height of the arc shoulder drop portion 9" is the drop value between the two wing pieces bordered by the arc shoulder line 91 at the local position of the arc shoulder line 91.

[0045] In addition, it should be noted that along the extension direction of the bionic volute tongue, the end wing piece farthest from the reference side 11 (see Appendix Figure 3 The terminal winglet 6a) will not continue to lay the winglets at the end away from the reference side 11, so there is no need to consider the arc top drop portion 8 or the arc shoulder drop portion 9 of the terminal winglet; at the same time, the terminal winglet 6a still belongs to the winglet 6, and the figure mark "6a" is given separately just for the convenience of intuitively understanding the above text in combination with the figure. In addition, since the airflow in the reflow channel basically flows against the extension direction, this application mainly takes any cross-section of the bionic volute tongue as a premise to introduce the winglet drop in the extension direction of the bionic volute tongue, so as to understand the changes in the flow environment of the airflow, but it can be understood that if the description direction is adjusted to the longitudinal direction of the bionic volute tongue, there will be a height difference between any two adjacent winglets accordingly, and this application will not repeat it.

[0046] In comparison between the large wing 4, the middle wing 5 and the small wing 6, the height of the arc top drop portion 8 of the large wing 4 is greater than the height of the arc top drop portion 8 of the middle wing 5> the height of the arc top drop portion 8 of the small wing 6, and the height of the arc shoulder drop portion 9 of the large wing 4 is greater than the height of the arc shoulder drop portion 9 of the middle wing 5> the height of the arc shoulder drop portion 9 of the small wing 6. Therefore, in the process of airflow flowing into the reflow channel, the flow space of the airflow gradually increases and the flow resistance continues to decrease. This is beneficial to increasing the reflow amount of the reflow channel between the bionic volute tongue and the crossflow fan blade 7 under the premise that the minimum gap between the volute tongue reflow area 2 and the crossflow fan blade 7 is constant, and can improve the surge phenomenon of the crossflow fan blade.

[0047] In addition, the height difference between the arc top drop portion 8 and the arc shoulder drop portion 9 of the large wing 4 is greater than the height difference between the arc top drop portion 8 and the arc shoulder drop portion 9 of the middle wing 5 and the height difference between the arc top drop portion 8 and the arc shoulder drop portion 9 of the small wing 6. Among them, the "height difference" is the height of the arc top drop portion 8 minus the height of the arc shoulder drop portion 9, which is also in line with the conventional understanding of the difference description in mathematics. Therefore, in the process of airflow flowing into the reflow channel, the difference in spatial drop faced by the airflow when flowing through the same winglet continues to increase, so that the airflow can flow to the next winglet at a higher speed, which is beneficial to avoid local flow blockage of the airflow to a certain extent, and is beneficial to further increase the reflow amount of the reflow channel between the bionic volute tongue and the crossflow fan blade 7, which can further improve the surge phenomenon of the crossflow fan blade.

[0048] The specific drop conditions at the large wing 4, the middle wing 5, and the small wing 6 are subject to the different design concepts, air conditioner sizes, component space utilization, etc. of different air conditioner manufacturers, which will make the specific drop conditions different. This application only provides individual examples for reference. Preferably, the height of the arc top drop portion 8 of the small wing 6 is 0-2mm, and the arc shoulder drop portion 9 of the small wing 6 is 0-1mm; the height of the arc top drop portion 8 of the middle wing 5 is 0-4mm, and the arc shoulder drop portion 9 of the middle wing 5 is 0-2mm; the height of the arc top drop portion 8 of the large wing 4 is 0-4mm, and the arc shoulder drop portion 9 of the large wing 4 is 0-2mm. At the same time, it is not recommended to use 0mm for specific drop conditions.

[0049] In the present invention, any air conditioner may include a volute, a crossflow blade 7, and the bionic volute tongue described in this embodiment, wherein the crossflow blade 7 is installed in the volute, and the bionic volute tongue is arranged on the base and located at the air outlet side of the crossflow blade 7. In addition, based on the relevant contents provided in this embodiment, the air conditioner also includes conventional components of an air conditioner indoor unit including heat exchange coils, shells and other structures, and accordingly, the indoor unit may be any air conditioner indoor unit such as a wall mounted unit or a cabinet unit. Similarly, the air conditioner also includes an air conditioner outdoor unit and related components; since they are all prior art, they will not be described in detail here.

[0050] Based on the bionic volute tongue of the present application, a local flow simulation is performed on the bionic volute tongue, as shown in the attached Figure 7 As shown, it can be seen that the return flow distribution in the return channel (at K) is relatively good, which is helpful to improve the surge phenomenon of the crossflow fan blade.

[0051] Based on the applicant's earlier application CN201820837568.2 (hereinafter referred to as the "early application"), for the air conditioner proposed in the earlier application, two identical air conditioners were taken for comparative tests, the volute tongue structure of the air conditioner in the earlier application was replaced by the bionic volute tongue proposed in this application, and the air conditioner after the replacement of the volute tongue structure was recorded as Air Conditioner A, and the air conditioner proposed in the earlier application was recorded as Air Conditioner B.

[0052] Air conditioners A and B were subjected to noise and surge tests in a wall resonance laboratory with the same windshield (middle windshield) conditions. The specific test results are shown in the following table.

[0053] Air Conditioner A Air Conditioner B Peak rotation noise 31.2dB 36.5dB Surge layer number under surge condition 10th floor 8th floor

[0054] Through experimental comparison, it can be seen that: compared with the existing air conditioner, the present application adopts a bionic volute tongue, which can effectively prevent the superposition of noise of the same frequency, reduce the decibel of the rotation noise of the air conditioner, and improve the noise reduction effect; on the other hand, by increasing the reflux volume of the reflux channel between the bionic volute tongue and the crossflow fan blade 7, the surge phenomenon of the crossflow fan blade is improved.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bionic snail tongue, characterized in that: The bionic volute tongue comprises a volute tongue recirculation zone (2) and a volute tongue fillet (3) which are connected in sequence, and the bionic volute tongue is provided with a plurality of fins on a side close to a crossflow fan blade (7); in the bionic volute tongue extension direction from the volute tongue recirculation zone (2) to the volute tongue fillet (3), the surface area of ​​any fin located at the volute tongue fillet (3) is smaller than the surface area of ​​any fin located at the volute tongue recirculation zone (2).

2. A bionic snail tongue according to claim 1, characterized in that: In the bionic volute tongue extension direction from the volute tongue recirculation area (2) to the volute tongue fillet (3), the distribution density of the fins located at the volute tongue fillet (3) is greater than the distribution density of the fins located at the volute tongue recirculation area (2).

3. The bionic snail tongue according to claim 1, characterized in that: For any two adjacent fins, on any cross section of the bionic volute tongue, the fin away from the reference side (11) of the bionic volute tongue is higher than the fin close to the reference side (11) of the bionic volute tongue.

4. The bionic snail tongue according to claim 1, characterized in that: The wing comprises a large wing (4), a middle wing (5) and a small wing (6).

5. The bionic snail tongue according to claim 4, characterized in that: On any cross section of the bionic volute tongue, the volute tongue fillet (3) is provided with at least one small wing (6); on any cross section of the bionic volute tongue, in a direction away from a reference side (11) of the bionic volute tongue, the volute tongue reflow zone (2) is provided with at least one large wing (4) and at least one middle wing (5) in sequence.

6. The bionic snail tongue according to claim 4, characterized in that: Any wing has at least one arc line at the end away from the reference side (11), wherein the arc line includes an arc top line (81) and an arc shoulder line (91), and both ends of the arc top line (81) are respectively connected to the arc shoulder line (91) in a smooth transition manner.

7. The bionic snail tongue according to claim 6, characterized in that: For any two adjacent wing pieces, an arc top drop portion (8) is formed between the wing piece and its adjacent wing piece at the arc top line (81), and an arc shoulder drop portion (9) is formed between the wing piece and its adjacent wing piece at the arc shoulder line (91); for any one wing piece, the height of the arc top drop portion (8) is greater than the height of the arc shoulder drop portion (9).

8. The bionic snail tongue according to claim 7, characterized in that: The height of the arc top drop portion (8) of the large wing (4) is greater than the height of the arc top drop portion (8) of the middle wing (5) and greater than the height of the arc top drop portion (8) of the small wing (6); the height of the arc shoulder drop portion (9) of the large wing (4) is greater than the height of the arc shoulder drop portion (9) of the middle wing (5) and greater than the height of the arc shoulder drop portion (9) of the small wing (6).

9. The bionic snail tongue according to claim 7, characterized in that: The height difference between the arc top drop portion (8) and the arc shoulder drop portion (9) of the large wing (4) is greater than the height difference between the arc top drop portion (8) and the arc shoulder drop portion (9) of the middle wing (5) and the height difference between the arc top drop portion (8) and the arc shoulder drop portion (9) of the small wing (6).

10. An air conditioner, characterized in that: The air conditioner comprises a volute, a crossflow fan blade (7) and the bionic volute tongue described in any one of claims 1 to 9, wherein the crossflow fan blade (7) is installed in the volute, the bionic volute tongue is arranged on a base, and the bionic volute tongue is located on the air outlet side of the crossflow fan blade (7).

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