Fan volute, fan and air conditioner indoor unit

Abstract

The utility model relates to a fan volute, a fan and an air conditioner indoor unit. The fan volute comprises an air channel upper wall and an air channel lower wall which are arranged at the air outlet in a spaced mode to form an air channel, the end, close to the air inlet, of the air channel upper wall is bent to form a volute tongue, a plurality of vortex generating structures are arranged on the wall face of the air channel upper wall, and each vortex generating structure is of a wing shape. The airfoil profile is composed of a front edge, a tail edge, an upper arc line and a lower arc line, according to the technical scheme, the vortex generating structure is arranged on the upper wall of the air duct, so that the wingtip vortex can be generated on the upper wall of the air duct, the wingtip vortex interacts with the vortex at the volute tongue of the air outlet, the effect of inhibiting airflow separation is achieved, the fan efficiency is improved, noise and vibration are relieved, the service life of equipment is prolonged, and the operation stability of the equipment is improved.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning equipment technology, and in particular to a fan casing, a fan, and an indoor air conditioning unit. Background Technology

[0002] Centrifugal fans, as important fluid transport equipment, are widely used in industrial production and daily life. The airflow at the volute of the centrifugal fan outlet often becomes unstable due to the generation of vortices, which not only reduces fan efficiency but also causes noise and vibration, adversely affecting the equipment's service life and operational stability. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides a fan casing, a fan, and an indoor air conditioning unit.

[0004] According to a first aspect of the present disclosure, a fan volute is provided. The fan volute includes an upper wall and a lower wall of the duct at the air outlet, which are spaced apart to form an air duct. The upper wall of the duct is bent at one end near the air inlet to form a volute tongue. A plurality of vortex generating structures are provided on the wall surface of the upper wall of the duct. The vortex generating structures are constructed as airfoils. The airfoils are composed of a leading edge, a trailing edge, and an upper arc and a lower arc located between the leading edge and the trailing edge.

[0005] Optionally, the plurality of said vortex generating structures are spaced apart along a first direction and a second direction, the first direction being the air outlet direction, and the second direction being orthogonal to the first direction, wherein the leading edge is disposed near the air inlet and the trailing edge is disposed near the air outlet.

[0006] Optionally, the density of the plurality of said vortex generating structures is uniformly distributed on the upper wall of the air duct.

[0007] Optionally, the multiple vortex generating structures are all identical in shape and size.

[0008] Optionally, the horizontal distance from the leading edge to the trailing edge of the vortex generating structure is 3 mm to 6 mm; the width of the vortex generating structure is 2 mm to 5 mm; and the vertical distance from the highest point of the arc on the vortex generating structure to the wall surface of the upper wall of the air duct is 0.5 mm to 2 mm.

[0009] Optionally, in the first direction, the horizontal distance from the trailing edge of one of two adjacent vortex generating structures to the leading edge of the other is 10 mm to 30 mm, and in the second direction, the shortest horizontal distance between the side edges of two adjacent vortex generating structures is 5 mm to 15 mm.

[0010] Optionally, the plurality of vortex generating structures are aligned in both the first direction and the second direction; or the plurality of vortex generating structures are aligned in one of the first direction and the second direction, while being staggered in the other direction.

[0011] Optionally, the vortex generating structure and the upper wall of the air duct are an integral structure.

[0012] According to a second aspect of the present disclosure, a fan is provided, comprising a fan casing including any of the above-described embodiments.

[0013] According to a third aspect of the present disclosure, an indoor air conditioning unit is provided, comprising a fan according to any one of the above-mentioned embodiments.

[0014] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: The fan casing provided by this disclosure has multiple vortex generating structures on the upper wall of the air duct, and the vortex generating structures are airfoil structures. Specifically, by setting vortex generating structures on the upper wall of the air duct, wingtip vortices can be generated at the position of the upper wall of the air duct. The wingtip vortices interact with the vortices at the outlet volute tongue, suppressing airflow separation, thereby improving the airflow effect at the outlet, which is beneficial to improving fan efficiency, reducing noise and vibration, and extending the service life and operational stability of the equipment.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0017] Figure 1 This is a schematic diagram of the structure of a fan according to an exemplary embodiment.

[0018] Figure 2 This is a side view of the upper wall of an air duct according to an exemplary embodiment.

[0019] Figure 3 This is a front view of the upper wall of an air duct according to an exemplary embodiment.

[0020] Figure 4 yes Figure 3 A magnified view of part A in the middle.

[0021] Figure 5 This is a schematic diagram of a vortex generating structure according to an exemplary embodiment.

[0022] Figure 6 yes Figure 5Side view of the vortex generator structure.

[0023] Figure 7 yes Figure 5 Top view of the vortex generator structure.

[0024] Explanation of reference numerals in the attached figures

[0025] 1-Upper wall of air duct, 2-Vortex generating structure, 21-Leading edge, 22-Tail edge, 23-Upper arc, 24-Lower arc, 3-Lower wall of air duct, 4-Vortex tongue. Detailed Implementation

[0026] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0027] like Figures 1 to 7 As shown, this exemplary embodiment provides a fan volute. This fan volute can be used in fans, and further, in fans of air conditioning equipment such as indoor air conditioning units.

[0028] Specifically, the fan casing provided in this disclosure includes an upper wall 1 and a lower wall 3 of the air duct at the air outlet, which are spaced apart to form an air duct. The upper wall 1 of the air duct is bent at the end near the air inlet to form a volute tongue 4. Multiple vortex generating structures 2 are provided on the wall surface of the upper wall 1. The vortex generating structure 2 is constructed as an airfoil, which is composed of a leading edge 21, a trailing edge 22, and an upper arc line 23 and a lower arc line 24 located between the leading edge 21 and the trailing edge 22.

[0029] The upper wall 1 of the air duct is bent at the end near the air inlet to form a volute tongue 4. The volute tongue 4 extends towards the air inlet and away from the impeller. As an important structure of the centrifugal fan, the volute tongue 4 guides the airflow and prevents the airflow from circulating within the fan casing. However, the volute tongue is also often the main source of vortices, which not only affects the fan efficiency but also causes noise and vibration.

[0030] Considering the aforementioned technical problems, the wind turbine volute provided in this disclosure incorporates multiple vortex generating structures 2 on the upper wall 1 of the air duct, with each vortex generating structure 2 being airfoil-shaped. This differs from related technologies that directly install guide structures on the volute tongue 4 to guide the flow direction of the airflow over the volute tongue. The wind turbine volute provided in this disclosure, by placing the vortex generating structures 2 on the upper wall 1 of the air duct, does not utilize the guiding effect of the vortex generating structures 2, but rather leverages their ability to generate vortices, specifically wingtip vortices, to suppress airflow separation at the outlet volute tongue.

[0031] The principle is that the vortex generating structure 2 adopts an airfoil design, which can generate wingtip vortices in the windward airflow. The wingtip vortices can interact with the vortices at the outlet volute. Specifically, after the high-energy outlet vortex mixes with the low-energy boundary layer vortex, the energy is transferred to the boundary layer, so that the boundary layer flow field in the adverse pressure gradient gains additional energy, which accelerates the flow of air in the boundary layer. The boundary layer fluid can continue to adhere to the surface without separation, thereby preventing airflow separation at the volute and achieving the purpose of improving the airflow effect at the outlet. This is beneficial to improving the efficiency of the fan, reducing noise and vibration, and extending the service life and operational stability of the equipment.

[0032] The vortex generating structure 2 and the upper wall of the air duct 1 can be constructed as an integral structure. For example, the vortex generating structure 2 can be integrally molded onto the upper wall of the air duct 1 by injection molding or compression molding, which helps to improve the structural stability of the vortex generating structure 2 when the fan is working and prevents it from falling off.

[0033] In some embodiments, multiple vortex generating structures 2 are spaced apart along a first direction and a second direction, where the first direction is the air outlet direction and the second direction is orthogonal to the first direction. The leading edge 21 is positioned near the air inlet, and the trailing edge 22 is positioned near the air outlet, meaning the leading edge 21 of the vortex generating structure 2 faces the windward side. Since the principle of wingtip vortex generation is based on the pressure difference between the upper and lower surfaces of the wing, positioning the leading edge 21 near the air inlet and the trailing edge 22 near the air outlet makes it easier to generate wingtip vortices.

[0034] like Figure 2 and Figure 3As shown, in some embodiments, multiple vortex generating structures 2 are evenly distributed on the upper wall 1 of the duct, which is beneficial for generating more uniform wingtip vortices. This allows the interaction between the vortices generated on the upper wall 1 of the duct and the vortex at the outlet volute to better prevent airflow diversion at the volute. In other embodiments, the multiple vortex generating structures 2 are all the same in shape and size. This is also beneficial for better preventing airflow diversion at the volute when the interaction between the vortices generated on the upper wall 1 of the duct and the vortex at the outlet volute. It should be noted that, depending on actual needs, in other embodiments, the vortex generating structures 2 may also be arranged on the upper wall 1 of the duct with a non-uniform density distribution, and the shape and size of the vortex generating structures 2 may also be different, which will not be elaborated here.

[0035] The size and distribution density of the vortex generating structure 2 can both affect the vortex generation effect of the vortex generating structure 2. For example Figures 5 to 7 As shown, in some embodiments, the horizontal distance L from the leading edge 21 to the trailing edge 22 of the vortex generating structure 2 is 3 mm to 6 mm, which can be understood as the chord length of the airfoil. The width W of the vortex generating structure 2 is 2 mm to 5 mm, which is the longest horizontal distance from one edge to the other. The vertical distance H from the highest point of the arc on the vortex generating structure 2 to the wall surface of the upper wall 1 of the duct is 0.5 mm to 2 mm, which can be understood as the height of the vortex generating structure 2. By setting the size of the vortex generating structure 2 itself within a reasonable range, the turbine efficiency will not be negatively affected by its size, nor will it be unable to generate effective wingtip vortices due to its small size.

[0036] In other embodiments, the distribution density is considered simultaneously. Figure 3 and Figure 4 In the first direction, the horizontal distance from the trailing edge 22 of one of two adjacent vortex generating structures 2 to the leading edge 21 of the other is 10 mm to 30 mm. In the second direction, the shortest horizontal distance between the side edges of two adjacent vortex generating structures 2 is 5 mm to 15 mm. The wingtip vortex is generated at the trailing edge 22 of the vortex generating structure 2 and is located between two adjacent vortex generating structures 2. Therefore, a reasonable distribution density of the vortex generating structures 2 is beneficial for obtaining better wingtip vortex generation, improving wind turbine efficiency, reducing noise and vibration, and extending the service life and operational stability of the equipment.

[0037] Furthermore, in some embodiments, the plurality of vortex generating structures 2 are aligned in both the first and second directions; or the plurality of vortex generating structures 2 are aligned in one of the first and second directions, while staggered in the other direction. For example, the plurality of vortex generating structures 2 are aligned in the first direction and staggered in the second direction, or the plurality of vortex generating structures 2 are staggered in the first direction and aligned in the second direction. The staggered arrangement here means that the plurality of vortex generating structures 2 are not on the same straight line in a certain direction. The number of vortex generating structures 2, the distance between two adjacent vortex generating structures 2, and the staggered angle, etc., can be set according to actual needs, and this disclosure does not impose any limitations on this.

[0038] According to a second aspect of the embodiments of this disclosure, a fan is also provided, such as... Figure 1 The described fan includes the fan casing of any of the above-mentioned types and has all of its beneficial effects, which will not be elaborated further here. The fan can be, for example, a centrifugal fan, and more specifically, a double-suction multi-blade centrifugal fan.

[0039] According to a third aspect of the present disclosure, an indoor air conditioning unit is also provided, including the fan of any of the above-mentioned embodiments.

[0040] In the above detailed description, reference has been made to the accompanying drawings, which illustrate specific aspects of this disclosure by way of illustration. In this regard, terms indicating direction or positional relationship, such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential,” are used with reference to the orientation of the described figures. Since components of the described device can be positioned in multiple different orientations, directional terms are used for illustrative purposes and not for limitation. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of this disclosure. Therefore, the following detailed description should not be considered limiting.

[0041] It should be understood that, unless otherwise specifically indicated, features of various embodiments of this disclosure described herein can be combined with each other. As used herein, the term “and / or” includes any one of the relevant listed items and any combination of any two or more; similarly, “at least one of…” includes any one of the relevant listed items and any combination of any two or more.

[0042] It should be understood that, unless otherwise expressly specified and limited, the terms "joining," "attaching," "installing," "connecting," "linking," "fixing," etc., used in the embodiments of this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms herein based on the specific circumstances.

[0043] Furthermore, the term "above" as used herein with respect to components, elements, or material layers formed or located "above" a surface may be used to indicate that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are arranged between the surface and the component, element, or material layer. However, the term "above" as used with respect to components, elements, or material layers formed or located "above" a surface may also optionally have a specific meaning: that the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, for example, in direct contact with the surface.

[0044] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0046] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0047] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0048] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0049] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A fan casing, characterized in that, The fan casing includes an upper wall and a lower wall of the air duct at the air outlet, which are spaced apart to form an air duct. The upper wall of the air duct is bent at the end near the air inlet to form a volute tongue. Multiple vortex generating structures are provided on the surface of the upper wall of the air duct. The vortex generating structures are constructed as airfoils. The airfoils are composed of a leading edge, a trailing edge, and an upper arc and a lower arc located between the leading edge and the trailing edge.

2. The fan casing according to claim 1, characterized in that, The plurality of vortex generating structures are spaced apart along a first direction and a second direction, wherein the first direction is the air outlet direction and the second direction is orthogonal to the first direction, and the leading edge is disposed near the air inlet and the trailing edge is disposed near the air outlet.

3. The fan casing according to claim 1, characterized in that, The density of the multiple vortex generating structures is uniformly distributed on the upper wall of the air duct.

4. The fan casing according to claim 1, characterized in that, The multiple vortex generating structures are all identical in shape and size.

5. The fan casing according to claim 2, characterized in that, The horizontal distance from the leading edge to the trailing edge of the vortex generating structure is 3 mm to 6 mm; the width of the vortex generating structure is 2 mm to 5 mm; and the vertical distance from the highest point of the arc on the vortex generating structure to the wall surface of the upper wall of the air duct is 0.5 mm to 2 mm.

6. The fan casing according to claim 5, characterized in that, In the first direction, the horizontal distance from the trailing edge of one of two adjacent vortex generating structures to the leading edge of the other is 10 mm to 30 mm. In the second direction, the shortest horizontal distance between the side edges of two adjacent vortex generating structures is 5 mm to 15 mm.

7. The fan casing according to claim 2, characterized in that, The plurality of vortex generating structures are aligned in both the first direction and the second direction; or the plurality of vortex generating structures are aligned in one of the first direction and the second direction, while being staggered in the other direction.

8. The fan casing according to claim 1, characterized in that, The vortex generating structure and the upper wall structure of the air duct are an integral structure.

9. A fan, characterized in that, Includes the wind turbine volute as described in any one of claims 1-8.

10. An indoor unit for an air conditioner, characterized in that, Includes the fan as described in claim 9.

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