Fan volute, fan and air conditioner

Abstract

The utility model relates to the technical field of fans, and discloses a fan volute which comprises a volute body and a volute tongue. The volute body is provided with an air outlet. The volute tongue is arranged at the spiral starting position of the volute body, a flow guide part is arranged on the inner wall of the volute tongue, and the flow guide part is arranged in the direction perpendicular to the flowing direction of air outlet airflow and protrudes along the inner wall of the volute tongue to dredge airflow flowing to the air outlet from the interior of the volute body. And in the flowing direction perpendicular to the air outlet airflow, the height of the flow guide part is gradually reduced from the two ends of the flow guide part to the middle position of the flow guide part. According to the volute tongue, airflow at the volute tongue can be dredged through the flow guide part, the flow field at the volute tongue is changed, aerodynamic noise is reduced, and the noise reduction effect is improved. The utility model further discloses a fan and an air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of fans, and in particular to a fan volute, a fan and an air conditioner. Background Art

[0002] As living standards improve, temperature is no longer the sole consideration when purchasing an air conditioner. People are increasingly concerned with the comfort of the air they receive. Noise is a key factor affecting air conditioning comfort, with aerodynamic noise being the primary source of noise in indoor units. Aerodynamic noise primarily originates from the fan in the indoor unit. In ducted air conditioners, the centrifugal fan generates even greater aerodynamic noise, impacting user comfort.

[0003] In the related art, there is a design modification by optimizing the volute profile and the air inlet and outlet, which can reduce the turbulence and eddy current of the air flow inside the volute, thereby reducing aerodynamic noise.

[0004] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0005] The aerodynamic noise of the fan is mainly caused by the high-speed airflow impacting the volute tongue. The noise cannot be effectively reduced by optimizing the volute profile and the air inlet and outlet for design modification, and the noise reduction effect is poor.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Utility Model Content

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a fan volute, a fan, and an air conditioner, which can guide the airflow at the volute tongue through a guide portion, change the flow field at the volute tongue, reduce aerodynamic noise, and improve the noise reduction effect.

[0009] In some embodiments, a fan volute comprises a volute body and a volute tongue. The volute body has an air outlet; the volute tongue is disposed at the spiral starting point of the volute body, and a guide portion is provided on the inner wall of the volute tongue. The guide portion is disposed perpendicular to the flow direction of the outlet airflow and protrudes along the inner wall of the volute tongue to guide the airflow from the interior of the volute body to the air outlet; wherein, along the flow direction perpendicular to the flow direction of the outlet airflow, the height of the guide portion gradually decreases from its ends to its middle position.

[0010] Optionally, the outer side wall of the guide portion is provided with a plurality of guide teeth, and the plurality of guide teeth are arranged in sequence along a flow direction perpendicular to the outlet air flow.

[0011] Optionally, the plurality of guide teeth are evenly arranged along a flow direction perpendicular to the outlet air flow.

[0012] Optionally, there is a flow gap between adjacent guide teeth, and the width of the flow gap is greater than or equal to 1 mm and less than or equal to 3 mm.

[0013] Optionally, the heights of the plurality of guide teeth gradually decrease along a direction from both ends of the guide portion to a middle position of the guide portion.

[0014] Optionally, each guide tooth extends from the windward side of the guide portion to the leeward side of the guide portion.

[0015] Optionally, a mounting groove is provided on a side wall of the volute body corresponding to the windward side of the air outlet, and the volute tongue is arranged in the mounting groove.

[0016] In some embodiments, a fan includes: a fan volute according to any of the above embodiments.

[0017] Optionally, the fan further comprises centrifugal blades, which are arranged in the volute body of the fan volute of any of the above embodiments, and the axial direction of the centrifugal blades is parallel to the length direction of the guide portion of the fan volute of any of the above embodiments.

[0018] In some embodiments, an air conditioner includes: a fan according to any of the above embodiments.

[0019] The fan volute, fan, and air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] By arranging a raised guide portion at the volute tongue of the fan volute, the guide portion is arranged along the flow direction perpendicular to the outlet air flow, and the height of the guide portion gradually decreases from its two ends to its middle position, so that the guide portion forms an inward-concave guide structure, and the airflow at the volute tongue is guided by the guide portion, and the flow field at the volute tongue is changed, thereby reducing the aerodynamic noise and improving the noise reduction effect.

[0021] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation. In addition,

[0023] Figure 1is a structural schematic diagram of a fan volute provided by an embodiment of the present disclosure;

[0024] Figure 2 is a schematic cross-sectional structural diagram of a volute body provided in an embodiment of the present disclosure;

[0025] Figure 3 is a schematic structural diagram of a flow guide portion provided by an embodiment of the present disclosure;

[0026] Figure 4 The embodiment of the present disclosure provides Figure 3 A magnified schematic diagram of part A in the middle;

[0027] Figure 5 Schematic diagram of the extension of multiple guide teeth on the windward surface of the guide portion provided by an embodiment of the present disclosure;

[0028] Figure 6 It is a structural schematic diagram of a wind turbine provided by an embodiment of the present disclosure.

[0029] Reference numerals:

[0030] 100. Volute body; 110. Air outlet; 120. Air inlet; 130. Airflow cavity; 140. Air outlet channel; 150. Mounting slot; 200. Volute tongue; 300. Guide portion; 310. Guide tooth; 320. Flow gap; 400. Centrifugal blade. DETAILED DESCRIPTION

[0031] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0032] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable, where appropriate, to facilitate the description of the embodiments of the present disclosure. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0034] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal connection between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this disclosure based on the specific circumstances.

[0035] Unless otherwise stated, the term "plurality" means two or more.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0037] Combine Figure 1-5 As shown, in some embodiments, a fan volute includes: a volute body 100 and a volute tongue 200. The volute body 100 has an air outlet 110; the volute tongue 200 is arranged at the spiral starting position of the volute body 100, and the inner wall of the volute tongue 200 is provided with a guide portion 300. The guide portion 300 is arranged in a direction perpendicular to the flow direction of the outlet air flow and protrudes along the inner wall of the volute tongue 200 to guide the air flow from the inside of the volute body 100 to the air outlet 110; wherein, along the flow direction perpendicular to the flow direction of the outlet air flow, the height of the guide portion 300 gradually decreases from its two ends to its middle position.

[0038] The fan volute provided by the embodiment of the present disclosure is adopted, and a raised guide portion 300 is provided at the volute tongue 200 of the fan volute. Since the guide portion 300 is provided in a flow direction perpendicular to the outlet airflow, and the height of the guide portion 300 gradually decreases from its two ends to its middle position, the guide portion 300 forms an inwardly concave guide structure, and the airflow at the volute tongue 200 is guided by the guide portion 300, and the flow field at the volute tongue 200 is changed, thereby reducing the aerodynamic noise and improving the noise reduction effect.

[0039] Optionally, the air outlet 110 is provided on the radial sidewall of the volute body 100, and the air inlet 120 is provided on the axial sidewall of the volute body 100. In this way, when the volute body 100 is assembled and used in a fan, the air inlet direction is axial and the air outlet direction is radial. Therefore, the air outlet 110 is provided on the radial sidewall of the volute body 100, and the air inlet 120 is provided on the axial sidewall of the volute body 100, thereby adapting to the air inlet and outlet characteristics of the volute body 100.

[0040] Optionally, both axially opposite side walls of the volute body 100 are provided with air inlets 120. In this way, both axially opposite side walls of the volute body 100 can be used for air intake, thereby increasing the air intake area and the air intake volume.

[0041] Taking the horizontal setting of the volute body 100 as an example, the axial direction of the volute body 100 is parallel to the horizontal direction, the volute tongue 200 is located in the lower area of the air outlet 110, and the guide part 300 is arranged on the upper side wall of the volute tongue 200 in the horizontal direction. Along the horizontal direction perpendicular to the flow direction of the outlet air flow, the height of the guide part 300 gradually decreases from its two ends to its middle position.

[0042] Optionally, the guide portion 300 is an arc-shaped structure that protrudes upward along the volute tongue 200, and the guide portion 300 has an arc-shaped surface structure from its windward surface to its leeward surface. In this way, the arc-shaped guide portion 300 can further improve the diversion and noise reduction effect. The outgoing airflow flows along the windward surface of the guide portion 300 to the leeward surface of the guide portion 300, and then flows out from the air outlet 110.

[0043] Optionally, along the axial direction of the volute body 100, the length of the guide portion 300 is less than or equal to the length of the air outlet 110. Thus, since the guide portion 300 is provided on the upper side wall of the volute tongue 200, the guide portion 300 is located inside the air outlet 110, and therefore the length of the guide portion 300 is set to be less than or equal to the length of the air outlet 110.

[0044] It can be understood that the length of the air outlet 110 refers to the length from one inner wall to the other inner wall of the air outlet 110 along the axial direction of the volute body 100 .

[0045] Optionally, the length of the guide portion 300 is equal to the length of the air outlet 110. In this way, the guide portion 300 can guide the airflow flowing out of the air outlet 110 in a wider range, improve the guiding effect, further reduce the aerodynamic noise, and improve the noise reduction effect.

[0046] Optionally, an airflow cavity 130 is defined within the volute body 100, and the airflow cavity 130 is connected to the air outlet 110 via an air outlet channel 140. The air guide 300 is located within the air outlet channel 140 and on the windward side of the air outlet 110. In this way, the airflow within the airflow cavity 130 flows along the air outlet channel 140 toward the air outlet 110 and is blown out. Since the airflow velocity within the air outlet channel 140 is relatively high, and the airflow changes direction within the air outlet channel 140 under the action of the volute tongue 200, it is easy to generate noise. Therefore, the air guide 300 is disposed within the air outlet channel 140 to guide the airflow in the air outlet channel 140, change the flow process within the air outlet channel 140, and reduce the generation of aerodynamic noise.

[0047] Optionally, a mounting groove 150 is formed on the side wall of the volute body 100 corresponding to the windward side of the air outlet 110, and the volute tongue 200 is disposed in the mounting groove 150. In this way, the mounting groove 150 is formed on the side wall of the volute body 100 to mount the volute tongue 200, and the volute tongue 200 fills the vacant position of the mounting groove 150 in the volute body 100. The volute tongue 200 and the volute body 100 together form a fan volute, thereby reducing the cost of the fan volute.

[0048] For example, the volute tongue 200 is installed in the installation groove 150 of the volute body 100 by welding or other connection methods. The volute tongue 200 and the volute body 100 are produced separately and assembled by welding after production and molding.

[0049] As another example, the volute tongue 200 and the volute body 100 are an integrated structure, and the volute tongue 200 and the volute body 100 are an integrated structure during the production stage, so that the strength of the volute tongue 200 and the volute body 100 is higher, and the volute tongue 200 is not easily separated from the volute body 100.

[0050] It can be understood that after the volute tongue 200 is assembled with the volute body 100, the air outlet 110 and the air outlet channel 140 are jointly enclosed by the volute tongue 200 and the volute body 100, the upper side wall of the volute tongue 200 is the lower inner wall of the air outlet channel 140, and one side edge of the volute tongue 200 is the side edge of the air outlet 110.

[0051] Optionally, the outer wall of the air guide portion 300 is provided with a plurality of guide teeth 310, which are arranged in a sequence perpendicular to the flow direction of the outgoing airflow. Thus, the provision of the plurality of guide teeth 310 can improve the flow diversion effect. Through the guidance of the air guide portion 300 and the guide teeth 310, the flow field at the volute tongue 200 is better changed, further reducing aerodynamic noise and improving the noise reduction effect.

[0052] Taking the horizontal setting of the guide part 300 as an example, multiple guide teeth 310 are arranged in sequence along the horizontal direction perpendicular to the flow direction of the outlet air flow. The outlet air flow flows along the outlet channel 140 and flows toward the air outlet 110 in a direction perpendicular to the guide part 300. Multiple guide teeth 310 are arranged along the flow direction perpendicular to the outlet air flow, forming a better diversion effect on the outlet air flow flowing in the front.

[0053] Optionally, the plurality of guide teeth 310 are evenly arranged perpendicular to the flow direction of the outgoing airflow. In this way, the outgoing airflow in the area of the guide portion 300 is evenly guided by the plurality of guide teeth 310 toward the air outlet 110, thereby improving the uniformity of the guide flow, further reducing aerodynamic noise, and improving the noise reduction effect.

[0054] Taking the horizontal arrangement of the air guide portion 300 as an example, the plurality of air guide teeth 310 are evenly arranged in a horizontal direction perpendicular to the flow direction of the outgoing air flow.

[0055] Optionally, each guide tooth 310 extends from the windward side of the guide portion 300 to the leeward side of the guide portion 300. Thus, since the outgoing airflow flows from the windward side of the guide portion 300 to its leeward side, each guide tooth 310 is arranged to extend from the windward side of the guide portion 300 to the leeward side of the guide portion 300. The extension direction of each guide tooth 310 is consistent with the flow trajectory of the outgoing airflow, thereby better guiding the outgoing airflow, improving the drainage effect of the outgoing airflow, and further improving the noise reduction effect.

[0056] Specifically, each guide tooth 310 extends from the windward side of the guide portion 300 to the leeward side of the guide portion 300 .

[0057] Optionally, each guide tooth 310 is an arc-shaped strip structure, and the curvature of each guide tooth 310 is adapted to the curvature of the guide portion 300. In this way, the guide teeth 310 are conveniently arranged along the upper side wall of the guide portion 300, and the guide teeth 310 with an arc-shaped strip structure can better guide the outgoing air flow.

[0058] Optionally, along a horizontal direction perpendicular to the flow direction of the outlet airflow, the widths of the plurality of guide teeth 310 are all consistent, thereby improving the uniformity of guiding the outlet airflow.

[0059] It can be understood that the guide part 300 is arranged in the horizontal direction perpendicular to the flow direction of the outlet air flow, and the length direction of the guide part 300 is the horizontal direction perpendicular to the flow direction of the outlet air flow, and multiple guide parts 300 are arranged along the length direction of the guide part 300.

[0060] Optionally, the width of the guide teeth 310 is less than or equal to one-ninety-fourth of the length of the guide portion 300. Thus, if the width of the guide teeth 310 is greater than one-ninety-fourth of the length of the guide portion 300, the width of the guide teeth 310 is large, resulting in a relatively small number of guide teeth 310 provided on the guide portion 300, and a reduced diversion effect. Therefore, setting the width of the guide teeth 310 to be less than or equal to one-ninety-fourth of the length of the guide portion 300 allows a larger number of guide teeth 310 to be provided on the guide portion 300, thereby better guiding the outgoing airflow.

[0061] Optionally, the width of the guide teeth 310 is equal to one-ninety-fourth of the length of the guide portion 300. This allows the guide portion 300 to be provided with a larger number of guide teeth 310 to guide the outgoing airflow, while also avoiding a reduction in the guide effect caused by a smaller width of the guide teeth 310, thereby better guiding the outgoing airflow.

[0062] For example, 47 guide teeth 310 are provided, and 47 guide teeth 310 are evenly arranged on the guide portion 300 , and the 47 guide teeth 310 are used to guide the outgoing air flow.

[0063] Optionally, the height of the plurality of guide teeth 310 gradually decreases along the direction from the ends of the guide portion 300 to the middle position of the guide portion 300. In this way, since the plurality of guide teeth 310 are sequentially arranged on the guide portion 300 in a direction perpendicular to the flow direction of the outgoing airflow, and the height of the guide portion 300 gradually decreases from its ends to its middle position, the height of the plurality of guide teeth 310 gradually decreases along the direction from the ends of the guide portion 300 to the middle position of the guide portion 300, so that the plurality of guide teeth 310 arranged on the guide portion 300 also form an inwardly concave guide structure. Through the cooperation between the guide portion 300 and the plurality of guide teeth 310, the airflow at the volute tongue 200 is better guided, the flow field at the volute tongue 200 is changed, and the noise reduction effect is further improved.

[0064] Alternatively, as Figure 3 As shown, along the vertical direction, the highest height of the guide portion 300 is denoted as L1, the height difference between the highest and lowest heights of the guide portion 300 is denoted as L2, and the height difference between the highest and lowest guide teeth 310 among the plurality of guide teeth 310 is denoted as L3, wherein L1 is greater than L2, and L1 is greater than L3. In this way, the guide portion 300 and the plurality of guide teeth 310 arranged on the guide portion 300 both form a concave guide structure. Through the cooperation of the guide portion 300 and the plurality of guide teeth 310, the airflow at the volute tongue 200 is better guided.

[0065] Optionally, L2 is greater than L3. In this way, the concave extent of the air guide portion 300 from its ends to the middle position is greater than the concave extent of the multiple guide teeth 310 from its ends to the middle position. Through the cooperation between the air guide portion 300 and the multiple guide teeth 310, the airflow at the volute tongue 200 is better guided.

[0066] Alternatively, as Figure 4 As shown, adjacent guide teeth 310 have flow gaps 320 between them. The width of the flow gaps 320 is greater than or equal to 1 mm and less than or equal to 3 mm. Thus, by forming flow gaps 320 between adjacent guide teeth 310, the outgoing airflow flows along the multiple flow gaps 320, providing a better channeling effect on the outgoing airflow, thereby further improving the noise reduction effect. If the width of the flow gaps 320 is less than 1 mm, the spacing between the flow gaps 320 formed between the guide teeth 310 is too small, preventing the outgoing airflow from passing smoothly and reducing the channeling effect. If the width of the flow gaps 320 is greater than 3 mm, the spacing between the flow gaps 320 formed between the guide teeth 310 is too large, resulting in a poor channeling effect on the outgoing airflow. Therefore, setting the width of the flow gaps 320 to be greater than or equal to 1 mm and less than or equal to 3 mm ensures that the outgoing airflow passes smoothly through the multiple flow gaps 320 and improves the channeling effect on the outgoing airflow.

[0067] Optionally, the width of the flow gap 320 is equal to 2 mm. Thus, setting the width of the flow gap 320 to 2 mm can ensure that the outlet airflow passes smoothly through the plurality of flow gaps 320 and improve the dredging effect of the outlet airflow.

[0068] It can be understood that the width of the flow gap 320 refers to the distance between adjacent guide teeth 310 along the length direction of the guide portion 300 .

[0069] For example, Figure 4 As shown, the width of the flow gap 320 is recorded as L4, and L4 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0070] Optionally, the width of the flow gap 320 is the same as the width of the guide teeth 310. In this way, through the cooperation of the plurality of guide teeth 310 and the flow gaps 320 between adjacent guide teeth 310, the outlet airflow passing through is more evenly guided, thereby improving the guiding effect and further improving the noise reduction effect.

[0071] Alternatively, as Figure 5As shown, each guide tooth 310 has the same extension length on the leeward side of the guide portion 300, and its extension length on the windward side of the guide portion 300 gradually increases from the ends to the middle of the guide portion 300. Thus, because the outgoing airflow is gathered toward the middle of the guide portion 300 under the action of the volute body 100 and the volute tongue 200, the extension length of each guide tooth 310 on the windward side of the guide portion 300 gradually increases from the ends to the middle of the guide portion 300. This allows the outgoing airflow in the middle area of the outlet flow channel 140 to be guided first by the guide teeth 310, further improving the guiding effect of the outgoing airflow.

[0072] Combine Figure 6 As shown, in some embodiments, the fan includes: the fan volute of any of the above embodiments.

[0073] The fan provided by the embodiment of the present disclosure is provided with a raised guide portion 300 at the volute tongue 200 of the fan volute. Since the guide portion 300 is arranged along a flow direction perpendicular to the flow of the outgoing air flow, and the height of the guide portion 300 gradually decreases from its two ends to its middle position, the guide portion 300 forms an inwardly concave guide structure. The guide portion 300 guides the airflow at the volute tongue 200 and changes the flow field at the volute tongue 200, thereby effectively reducing the aerodynamic noise and improving the noise reduction effect.

[0074] Optionally, the fan further includes: centrifugal blades 400. The centrifugal blades 400 are arranged in the volute body 100 of the fan volute of any of the above-mentioned embodiments, and the axial direction of the centrifugal blades 400 is parallel to the length direction of the guide portion 300 of the fan volute of any of the above-mentioned embodiments. In this way, the centrifugal blades 400 rotate in the volute body 100, so that negative pressure is generated in the volute body 100, thereby sucking in air through the air inlet 120 on the axial side wall of the volute body 100 and blowing it out from the air outlet 110 in the radial direction of the volute body 100. The axial direction of the centrifugal blades 400 is parallel to the length direction of the guide portion 300, so that the outlet airflow blown by the centrifugal blades 400 is blown directly toward the guide portion 300, thereby improving the guide effect and reducing the aerodynamic noise generated by the fan.

[0075] In some embodiments, an air conditioner includes: a fan according to any of the above embodiments.

[0076] The air conditioner provided by the embodiment of the present disclosure can reduce the startup noise generated when the air conditioner is running by assembling the fan of any of the above embodiments in the air conditioner, thereby reducing the noise of the air conditioner.

[0077] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A fan volute, characterized in that: include: The volute body (100) has an air outlet (110); A volute tongue (200) is provided at the spiral starting position of the volute body (100); a flow guide portion (300) is provided on the inner wall of the volute tongue (200); the flow guide portion (300) is provided in a direction perpendicular to the flow direction of the outlet air flow and protrudes along the inner wall of the volute tongue (200) to guide the air flow from the inside of the volute body (100) to the air outlet (110); Wherein, along the flow direction perpendicular to the outgoing air flow, the height of the guide portion (300) gradually decreases from its two ends to its middle position.

2. The fan volute according to claim 1, characterized in that: The outer side wall of the air guide portion (300) is provided with a plurality of air guide teeth (310), and the plurality of air guide teeth (310) are arranged in sequence along a flow direction perpendicular to the outlet air flow.

3. The fan volute according to claim 2, characterized in that: The plurality of guide teeth (310) are evenly arranged along a flow direction perpendicular to the outlet air flow.

4. The fan volute according to claim 3, characterized in that: There is a flow gap (320) between adjacent flow guide teeth (310), and the width of the flow gap (320) is greater than or equal to 1 mm and less than or equal to 3 mm.

5. The fan volute according to claim 2, characterized in that: The heights of the plurality of guide teeth (310) gradually decrease in a direction from both ends of the guide portion (300) to a middle position of the guide portion (300).

6. The fan volute according to claim 2, characterized in that: Each guide tooth (310) extends from the windward side of the guide portion (300) to the leeward side of the guide portion (300).

7. The fan volute according to any one of claims 1 to 6, characterized in that: The volute body (100) is provided with a mounting groove (150) on a side wall corresponding to the windward side of the air outlet (110), and the volute tongue (200) is arranged in the mounting groove (150).

8. A fan, characterized in that: include: A fan volute according to any one of claims 1 to 7.

9. The fan according to claim 8, characterized in that Also includes: A centrifugal fan blade (400) is arranged in a volute body (100) of a fan volute according to any one of claims 1 to 7, and the axial direction of the centrifugal fan blade (400) is parallel to the length direction of the guide portion (300) of the fan volute according to any one of claims 1 to 7.

10. An air conditioner, characterized in that: include: A fan according to any one of claims 8 to 9.

Images