Low wind resistance volute and range hood

Abstract

The present invention provides a low-wind-resistance volute and a range hood, relating to the technical field of kitchen appliances. The low-wind-resistance volute includes a volute body and a volute tongue formed on the volute body; the volute body forms a gradually expanding section with a gradually increasing diameter at the fluid outlet; the included angle between the profile line of the gradually expanding section and the horizontal direction is a1, and a1 is less than θ1; wherein, θ1 is the diffuser angle on the side close to the volute tongue when the profile line of the gradually expanding section is a straight line. It solves the technical problem of large aerodynamic performance loss of the volute in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a low wind resistance volute and a range hood. Background Art

[0002] When choosing cooking methods such as barbecue and hot pot, in order to prevent the escaped oil smoke from adhering to furniture and clothes, you can use a desktop range hood to absorb the oil smoke, thereby purifying the air and improving the quality of dining. Compared with traditional purifiers and purification lamps, desktop range hoods can purify oil smoke more timely and have better effects.

[0003] In traditional tabletop range hoods, when the airflow flows in the volute, as the flow area of ​​the volute increases, the flow velocity decreases and the static pressure increases, but the outlet velocity is still too high. In order to further reduce the outlet velocity and thus reduce noise, a diffuser is usually added after the volute outlet. Figure 1 As shown. Among them: θ1 represents the diffusion angle close to the volute tongue, θ2 represents the diffusion angle away from the volute tongue, EF represents the diffusion section, AB represents the diffusion section inlet, CD represents the diffusion section outlet, and the diffusion section inlet starts from the tangent point with the volute tongue.

[0004] Generally, due to the limitation of the structure of tabletop range hoods, the angle of the volute diffuser used in tabletop range hoods can be as high as 145°. During the gradual expansion stroke, the flow velocity gradually decreases along the way, and the pressure gradually increases along the way. The fluid particles are subjected to the pressure difference opposite to the flow direction. The fluid particles close to the tube wall have a low velocity due to the viscous force. Under the action of the reverse pressure difference, the velocity gradually decreases to zero, and then flow in the opposite direction of the mainstream occurs. Where the flow velocity is equal to 0, the mainstream begins to separate from the wall, and a vortex zone appears in the area where the reverse flow occurs, which greatly causes a loss of aerodynamic performance and an increase in noise. The larger the diffusion angle, the greater the loss. Summary of the invention

[0005] The object of the present invention is to provide a low wind resistance volute and a range hood, so as to alleviate the technical problem of large loss of aerodynamic performance of the volute existing in the prior art.

[0006] In a first aspect, the present invention provides a low wind resistance volute, comprising: a volute body and a volute tongue formed on the volute body;

[0007] The volute body forms a gradually expanding section with a gradually increasing diameter at the fluid outlet; the angle between the profile line of the gradually expanding section and the horizontal direction is a1, and a1 is smaller than θ1;

[0008] Wherein, θ1 is the diffusion angle close to the volute tongue when the profile of the gradually expanding section is a straight line.

[0009] Furthermore, the profile of the gradually expanding section on at least one side is an arc, a quadratic curve or a broken line.

[0010] Furthermore, the value range of a1 is 0.6θ1 to 0.9θ1.

[0011] Furthermore, when the profile of the gradually expanding section is an arc, the arc is tangent to the volute tongue, and the tangent point is the starting end point of the arc.

[0012] Furthermore, at least one side of the volute body is provided with a baffle, and the baffle has at least one straight side;

[0013] One vertex of the straight side coincides with the end point of the circular arc; or, a gap is left between one vertex of the straight side and the end point of the circular arc.

[0014] Furthermore, the ratio of the interval to the length of the straight side ranges from 0 to 0.3.

[0015] Furthermore, when the profile of the gradually expanding section adopts a quadratic curve, a coordinate system is established with the axis perpendicular to the profile of the gradually expanding section as the Y axis, and the function expression of the quadratic curve is:

[0016] y=-0.03(x+m) 2 +0.03;

[0017] Among them, -0.02≤m≤0.02.

[0018] Furthermore, when the profile of the gradually expanding section is a broken line, the broken line has multiple broken line segments;

[0019] The angle between the fold line segment close to the volute tongue and the horizontal direction, and the angle between adjacent fold line segments are both smaller than θ1.

[0020] Furthermore, a vortex destroyer is provided on the inner side of the gradually expanding section.

[0021] Furthermore, the vortex eliminater is located in the gradually expanding section on one side of the volute tongue.

[0022] Furthermore, a vortex eliminator is provided on the inner side of the gradually expanding section. The vortex eliminator adopts a long thin sheet structure and is consistent with the profile of the gradually expanding section.

[0023] Furthermore, the length of the vortex eliminator is 0.5 to 1.5 times the length of the profile of the diverging section.

[0024] And / or, the thickness of the vortex eliminator is 0.5 to 1.5 times the diameter of the volute tongue.

[0025] Furthermore, the vortex eliminators are provided in a plurality of groups, and the plurality of groups of vortex eliminators are arranged at intervals along an extension direction perpendicular to the gradually expanding section.

[0026] Beneficial effects:

[0027] The low wind resistance volute provided by the present invention has a gradually expanding section formed at the fluid outlet of the volute body, and the angle between the profile of the gradually expanding section and the horizontal direction is a1, and a1 is less than θ1, wherein θ1 is the expansion angle close to the volute tongue side when the profile of the gradually expanding section is a straight line. Such a setting can reduce the angle at the fluid inlet of the gradually expanding section, and the caliber of the gradually expanding section is gradually increased along the fluid flow direction, which can reduce the adverse pressure gradient of the gradually expanding section, thereby inhibiting flow separation, reducing large-scale vortices in the gradually expanding section, and thereby improving aerodynamic performance, reducing noise, and improving efficiency.

[0028] In a second aspect, the present invention provides a range hood, comprising: a range hood housing, a fan, and a low wind resistance volute as described in any one of the aforementioned embodiments;

[0029] Adjacent sides of the range hood housing are respectively provided with a range hood inlet and a range hood outlet;

[0030] At least one side of the volute body is provided with a baffle, and the volute body is fixedly connected to the interior of the range hood housing through the baffle and communicates with the range hood inlet;

[0031] The gradually expanding section is in communication with the smoke exhaust fan outlet;

[0032] The fan is located in the volute body.

[0033] Beneficial effects:

[0034] The range hood provided by the present invention includes the aforementioned low-wind resistance volute. Therefore, the technical advantages and effects that can be achieved by the range hood also include the technical advantages and effects that can be achieved by the low-wind resistance volute, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a schematic diagram of the structure of a traditional volute;

[0037] Figure 2 A schematic structural diagram of a low wind resistance volute provided in an embodiment of the present invention;

[0038] Figure 3 One of the top views of the low wind resistance volute provided by the embodiment of the present invention;

[0039] Figure 4 for Figure 1 The streamlines near the tongue of the traditional volute are shown;

[0040] Figure 5 for Figure 3 The streamlines near the tongue of the low-drag volute are shown;

[0041] Figure 6 A second top view of the low wind resistance volute provided by an embodiment of the present invention;

[0042] Figure 7 A third top view of the low wind resistance volute provided by an embodiment of the present invention;

[0043] Figure 8 A fourth top view of a low wind resistance volute provided in an embodiment of the present invention;

[0044] Fig. 9 A fifth top view of the low wind resistance volute provided in an embodiment of the present invention;

[0045] Fig.10 for Figure 3 A top view of a low-drag volute with a vortex destroyer is shown;

[0046] Fig.11 for Fig.10 Side view of

[0047] Fig.12 This is a schematic diagram of the partial disassembly of the range hood.

[0048] icon:

[0049] 100-volute body; 110-volute tongue; 120-increasingly expanding section;

[0050] 200- baffle;

[0051] 300- vortex eliminater;

[0052] 410-hood housing; 420-hood rear panel; 411-hood inlet; 412-hood outlet;

[0053] 500-Blower. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0057] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0058] In addition, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0059] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0061] Reference Figure 2 and Figure 3 The present embodiment provides a low wind resistance volute, comprising a volute body 100 and a volute tongue 110 formed on the volute body 100; the volute body 100 forms a gradually increasing expansion section 120 with a gradually increasing diameter at the fluid outlet; the angle between the profile line of the gradually expanding section 120 and the horizontal direction (i.e., the diffusion angle) is a1, and a1 is less than θ1; wherein θ1 is the diffusion angle on the side close to the volute tongue 110 when the profile line of the gradually expanding section 120 is a straight line.

[0062] The low-drag volute provided in this embodiment can reduce the angle of the fluid inlet of the gradually expanding section 120 through the above-mentioned setting, and the diameter of the gradually expanding section 120 is gradually increased along the fluid flow direction, which can reduce the adverse pressure gradient of the gradually expanding section 120, thereby inhibiting flow separation, reducing large-scale vortices in the gradually expanding section 120, and thus improving aerodynamic performance, reducing noise, and improving efficiency.

[0063] Furthermore, the profile of the gradually expanding section 120 on at least one side is an arc, a quadratic curve or a broken line.

[0064] Specifically, two opposite sides of the volute body 100 are provided with gradually expanding sections 120 , and the profiles of the gradually expanding sections 120 on the opposite sides may be the same or different.

[0065] For example, refer to Figure 3 , one side of the line is an arc, and the other side of the line is a straight line; refer to Figure 7 , one side of the line is a quadratic curve, and the other side of the line is a straight line; refer to Figure 2 or Figure 8 , wherein the profile line on one side is a circular arc, and the profile line on the other side is also a circular arc. In this embodiment, the value range of a1 is 0.6θ1 to 0.9θ1.

[0066] Exemplarily, the values ​​of a1 are 0.6θ1, 0.7θ1, 0.8θ1 and 0.9θ1.

[0067] Specifically, the value range of θ1 is 120 to 145°.

[0068] Please continue to refer to Figure 3 When the profile of the gradually expanding section 120 is an arc, the arc is tangent to the volute tongue 110, and the tangent point is the starting end point of the arc.

[0069] by Figure 3 Taking the low wind resistance volute shown in the figure as an example, keeping θ2 unchanged, the simulation results under different parameters (θ1) are shown in Table 1.

[0070] Table 1

[0071]

[0072] After the oil smoke enters the gradually expanding section 120 from the volute body 100, it is first diffused at a smaller diffusion angle a1. As the oil smoke flows toward the outlet, the diffusion angle a1 gradually increases continuously. This design reduces the local resistance coefficient of the air outlet while ensuring the deceleration and pressure increase effect. Through numerical simulation, it is found that compared with the traditional volute, when a1=0.8θ1, the aerodynamic performance of the fan reaches the best. Through simulation, it is found that this embodiment can increase the air volume by about 7% and reduce the torque by about 3%, effectively improving the efficiency.

[0073] Reference Figure 4 , Figure 4 This is the streamline condition near the tongue of the traditional volute. Figure 5 For this embodiment Figure 3 The streamline of the low wind resistance volute is shown in FIG. By comparing the figures, it can be found that there is a large vortex near the volute tongue 110 of the traditional volute, and after adopting the solution of this embodiment, the vortex is eliminated.

[0074] Reference Figure 2 or Figure 3 At least one side of the volute body 100 is provided with a baffle 200, and the baffle 200 has at least one straight side CD; a vertex of the straight side CD coincides with the end point of the arc.

[0075] In this embodiment, a baffle 200 is provided on one side of the volute body 100 . The baffle 200 is a rectangular baffle, and an air inlet hole for air intake is provided on the baffle 200 .

[0076] In other embodiments, baffles 200 may be provided on both opposite sides of the volute body 100 . For details, please refer to the arrangement on one side, which will not be described in detail here.

[0077] Reference Figure 6 , there is a gap GH between one vertex of the straight side CD and the end point of the arc.

[0078] Specifically, the ratio of the gap GH to the length of the straight edge CD ranges from 0 to 0.3.

[0079] Exemplarily, the ratio of the gap GH to the length of the straight side CD is 0, 0.1, 0.2 or 0.3.

[0080] When the interval GH is 0, that is, when one vertex of the straight side CD coincides with the end point of the arc, the ratio of the interval GH to the length of the straight side CD is 0.

[0081] Reference Figure 7When the profile of the gradually expanding section 120 adopts a quadratic curve, the axis perpendicular to the profile of the gradually expanding section 120 is taken as the Y axis, and O is taken as the origin to establish a coordinate system. The function expression of the quadratic curve is:

[0082] y=-0.03(x+m) 2 +0.03;

[0083] Among them, -0.02≤m≤0.02, and the unit of m is meter.

[0084] For example, the value of m can be -0.02, -0.01, 0, 0.01 and 0.02. Fig. 9 When the profile of the gradually expanding section 120 is a broken line, the broken line has multiple broken line segments; the angle between the broken line segment close to the volute tongue 110 and the horizontal direction, and the angle between adjacent broken line segments are both smaller than θ1.

[0085] In this embodiment, the profile of the gradually expanding section 120 on one side of the volute tongue 110 is a fold line, which has three fold line segments. The angle between the fold line segment close to the volute tongue 110 and the horizontal direction is a2, and then the angles between adjacent fold line segments are 1.1a2 and 0.8a2 respectively.

[0086] In other embodiments, the fold line may also have two fold line segments, four fold line segments or more, as long as the angle between the fold line segment close to the volute tongue 110 and the horizontal direction and the angle between adjacent fold line segments are both smaller than θ1.

[0087] Based on the above embodiments, Fig.10 A vortex destroyer 300 is provided on the inner side of the expanding section 120 .

[0088] After optimizing the profile of the divergent section 120, the vortex caused by the adverse pressure gradient of the divergent section 120 still cannot be completely eliminated. Therefore, adding a vortex eliminator 300 can cut the large-scale, high-energy vortex at its location, thereby breaking it into low-energy, small-scale vortices, accelerating its dissipation speed, and further reducing the noise and vibration problems caused by the vortex.

[0089] The vortex eliminator 300 is disposed at least on one side of the diverging section 120 .

[0090] In this embodiment, the vortex eliminater 300 is located at the gradually expanding section 120 on the side where the volute tongue 110 is provided.

[0091] In this embodiment, refer to Fig.10 When the profile of the gradually expanding section 120 is an arc or a quadratic curve, a vortex eliminator 300 is provided on the inner side of the gradually expanding section 120 . The vortex eliminator 300 is a long thin sheet structure and is consistent with the profile of the gradually expanding section 120 .

[0092] Further, the length of the vortex eliminator 300 is 0.5 to 1.5 times the length of the profile of the diverging section 120. Exemplarily, the length of the vortex eliminator 300 is 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 11, 1.2, 1.3, 1.4 or 1.5 times the length of the profile of the diverging section 120.

[0093] When the length of the vortex eliminater 300 is one time the length of the profile of the diverging section 120 , the lengths of the two are equal.

[0094] Furthermore, the thickness of the vortex eliminator 300 is 0.5 to 1.5 times the diameter of the volute tongue 110. For example, the thickness of the vortex eliminator 300 is 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 11, 1.2, 1.3, 1.4 or 1.5 times the diameter of the volute tongue 110.

[0095] When the thickness of the vortex breaker 300 is 1 times the diameter of the volute tongue 110 , the thickness of the vortex breaker 300 is equal to the diameter of the volute tongue 110 .

[0096] In this embodiment, refer to Fig.11 The vortex eliminators 300 are arranged in multiple groups, and the multiple groups of vortex eliminators 300 are arranged at intervals along an extension direction perpendicular to the gradually expanding section 120.

[0097] In one embodiment of the present application, the vortex breaker 300 is arranged in two groups with a thickness ranging from 0.5 to 2 mm. Exemplarily, the thickness of the vortex breaker 300 is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm and 2 mm.

[0098] Reference Fig.12 The present embodiment further provides a range hood, comprising a range hood housing 410, a fan 500 and the aforementioned low wind resistance volute; adjacent sides of the range hood housing 410 are respectively provided with a range hood inlet 411 and a range hood outlet 412; at least one side of the volute body 100 is provided with a baffle 200, and the volute body 100 is fixedly connected to the interior of the range hood housing 410 through the baffle 200 and communicates with the range hood inlet 411; the gradually expanding section 120 is communicated with the range hood outlet 412; the fan 500 is located in the volute body 100.

[0099] Wherein, the range hood can be a desktop range hood.

[0100] Furthermore, the rear end of the range hood housing 410 is open, and a range hood rear plate 420 is provided at the rear end opening. The fan 500 can be installed on the range hood rear plate 420 and placed in the volute body 100 .

[0101] Optionally, the range hood housing 410 and the range hood rear plate 420 may be connected by rivets.

[0102] When the range hood is in operation, oil smoke enters from the range hood inlet 411 , and after the fan 500 works, the flow direction is changed and the oil smoke is discharged from the range hood outlet 412 .

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low wind resistance volute, characterized in that: include: A volute body (100) and a volute tongue (110) formed on the volute body (100); The volute body (100) forms a gradually expanding section (120) with a gradually increasing diameter at the fluid outlet; the angle formed between the profile line of the gradually expanding section (120) on the side close to the volute tongue and the horizontal direction toward the inside of the volute body (100) is a1, and a1 is smaller than θ1; The profile of the gradually expanding section (120) close to the volute tongue is a broken line; When the profile line of the gradually expanding section (120) close to the volute tongue is a broken line, the angle between the broken line segment closest to the volute tongue and the horizontal direction is a1; The horizontal direction is parallel to the plane where the outlet of the gradually expanding section (120) of the low-drag volute is located; Wherein, θ1 is the angle formed between the profile line of the gradually expanding section (120) on the side close to the volute tongue (110) and the horizontal direction toward the inside of the volute body (100) when the profile line of the gradually expanding section (120) is a straight line; The value range of a1 is 0.6θ1~0.9θ1.

2. The low wind resistance volute according to claim 1, characterized in that: When the profile of the gradually expanding section (120) is a broken line, the broken line has multiple broken line segments; The angle between the fold line segment close to the volute tongue (110) and the horizontal direction, as well as the angle between adjacent fold line segments, are both smaller than θ1.

3. The low wind resistance volute according to claim 1 or 2, characterized in that: A vortex eliminater (300) is provided on the inner side of the gradually expanding section (120).

4. The low wind resistance volute according to claim 3, characterized in that: The vortex eliminater (300) is located in the gradually expanding section (120) on the side where the volute tongue (110) is provided.

5. The low wind resistance volute according to claim 1, characterized in that: A vortex eliminator (300) is provided on the inner side of the gradually expanding section (120); the vortex eliminator (300) adopts a long thin sheet structure and is consistent with the profile of the gradually expanding section (120).

6. The low wind resistance volute according to claim 5, characterized in that: The length of the vortex eliminater (300) is 0.5 to 1.5 times the length of the profile of the gradually expanding section (120); And / or, the thickness of the vortex eliminater (300) is 0.5 to 1.5 times the diameter of the volute tongue (110).

7. The low wind resistance volute according to claim 6, characterized in that: The vortex eliminators (300) are arranged in a plurality of groups, and the plurality of groups of vortex eliminators (300) are arranged at intervals along an extension direction perpendicular to the gradually diverging section (120).

8. A range hood, characterized in that: include: A range hood housing (410), a fan (500), and a low wind resistance volute as claimed in any one of claims 1 to 7; Adjacent sides of the range hood housing (410) are respectively provided with a range hood inlet (411) and a range hood outlet (412); A baffle (200) is provided on at least one side of the volute body (100); the volute body (100) is fixedly connected to the interior of the range hood housing (410) through the baffle (200) and communicates with the range hood inlet (411); The gradually expanding section (120) is in communication with the smoke exhaust fan outlet (412); The fan (500) is located inside the volute body (100).

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