Fan volute, fan and range hood

Abstract

The fan volute comprises a body extending along a first spiral line, an air outlet is formed in the tail end of the body, the body comprises a first connecting face, a first spiral molded line face, a second connecting face, a second spiral molded line face and a third connecting face in the molded line direction, and the first connecting face, the first spiral molded line face, the second connecting face, the second spiral molded line face and the third connecting face are sequentially connected. The second connecting face is a plane, and the edge, deviating from the first spiral molded line face, of the first connecting face and the edge, deviating from the second spiral molded line face, of the third connecting face are both located at the air outlet.

Description

Technical Field

[0001] The utility model relates to the field of range hoods, in particular to a fan volute, a fan and a range hood. Background Art

[0002] In order to ensure the operating power of the fan used in the range hood, the shell used by the fan is generally large in size, which will occupy a large space in the range hood box. As a result, the fan is very likely to interfere with other components inside the hood box, making it difficult to meet the installation requirements of the fan. Conversely, in order to reduce the interference between the fan and other components in the hood box, only a small-sized fan can be selected, which in turn makes it difficult to meet the operating power requirements of the range hood. Utility Model Content

[0003] Based on this, it is necessary to provide a fan volute, a fan and a range hood to address the problem that it is difficult to balance the fan power and installation requirements.

[0004] A fan volute comprises a main body extending along a first spiral line, an air outlet being arranged at the rear end of the main body, the main body comprising a first connecting surface, a first spiral profile surface, a second connecting surface, a second spiral profile surface and a third connecting surface which are connected in sequence in the profile direction, the second connecting surface being a plane, and an edge of the first connecting surface away from the first spiral profile surface and an edge of the third connecting surface away from the second spiral profile surface both being located at the air outlet.

[0005] The second connecting surface of the utility model is tangent to the first spiral profile surface and the second spiral profile surface at the same time.

[0006] The first spiral profile surface and the second spiral profile surface of the utility model are located on the same logarithmic spiral line.

[0007] The third connecting surface of the utility model comprises a first avoidance plane, and the first avoidance plane is tangent to the second spiral line surface so that the first avoidance plane and the second spiral line surface are smoothly connected.

[0008] The first connecting surface of the utility model comprises a first plane and a first arc surface, and both side edges of the first arc surface are smoothly connected to the first plane and the first spiral line surface respectively.

[0009] A fan comprises an impeller and a fan volute, wherein an air inlet is arranged in the middle of the body, and the impeller is rotatably arranged in the air inlet.

[0010] A range hood comprises a smoke box and the fan as claimed in claim installed in the smoke box, wherein the second connecting surface is spaced apart from an inner wall of the smoke box.

[0011] The air outlet of the utility model is installed at the top inner wall of the smoke box, and the second connecting surface is at least partially located between the rotating shaft of the impeller and the top inner wall of the smoke box.

[0012] The side wall of the cigarette box of the utility model is provided with a smoking opening, and the air inlet is located at the smoking opening.

[0013] The range hood of the utility model further comprises a smoke baffle, which is rotatably arranged on the smoke box to open and close the air inlet.

[0014] The beneficial effects of the utility model are:

[0015] The fan volute sets the second connection surface as a plane, so that the fan can avoid other components in the smoke box without significantly reducing the size specifications, ensuring the basic performance of the fan, thereby taking into account the power requirements and installation requirements of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the fan volute in Embodiment 1 of the utility model;

[0017] Figure 2 The three-dimensional structure of the fan volute in the first embodiment of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 3 The three-dimensional structure of the fan volute in the first embodiment of the utility model is shown in FIG. Figure 2 .

[0019] Reference numerals:

[0020] 1. Main body; 11. First connecting surface; 111. First plane; 112. First arc surface; 12. First spiral line surface; 13. Second connecting surface; 14. Second spiral line surface; 15. Third connecting surface; 2. Air outlet; 3. Air inlet. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0027] Embodiment 1:

[0028] See also Figure 1-Figure 3 , this embodiment provides a fan, including an impeller and a fan volute.

[0029] The fan volute includes a body 1 extending along a first spiral line, and the first spiral line is only spiraled once, so that the outline of the body 1 is generally in the shape of a "6". The tail end of the body 1 (the part of the body 1 at the end of the first spiral line) is provided with an air outlet 2, and the middle of the body 1 is provided with an air inlet 3. The impeller is rotatably arranged in the air inlet 3, and the oil smoke enters the interior of the body 1 through the air inlet 3 and is finally discharged from the air outlet 2. The above features are all prior art and will not be repeated in this embodiment.

[0030] The body 1 starts from the inner edge of the air outlet 2 and ends at the outer edge of the air outlet 2. In the extension direction of the body 1 profile, the body 1 includes a first connecting surface 11, a first spiral profile surface 12, a second connecting surface 13, a second spiral profile surface 14 and a third connecting surface 15 connected in sequence. The first connecting surface 11 extends from the inner edge of the air outlet 2 to the edge of the first spiral profile surface 12. One side edge of the third connecting surface 15 extends to the outer edge of the air outlet 2, and the other side edge coincides with the edge of the second spiral profile surface 14 away from the first connecting surface 11.

[0031] In the prior art, the first spiral profile surface 12, the second connecting surface 13, the second spiral profile surface 14 and the third connecting surface 15 are all arc surfaces, and the profiles of the first spiral profile surface 12, the second connecting surface 13, the second spiral profile surface 14 and the third connecting surface 15 will form a complete logarithmic spiral line. This design scheme is the mainstream design scheme of the existing fan. Designing the profile of the outer peripheral surface of the body 1 except the first connecting surface 11 as a logarithmic spiral line can ensure that the performance of the fan is maintained at a high level. For this reason, in the prior art, fans of different specifications only differ in size, and the shape of the profile is fixed. Therefore, it can be approximately considered that the actual power of the existing fan is only determined by the size and has nothing to do with the shape. In addition, considering industrial production, the actual size specifications of the fan are very few, and the size differences of different fans are large. Therefore, there is a very obvious power difference between range hoods using fans of different sizes.

[0032] At present, the range hoods on the market include smoke boxes and the corresponding fans in the above-mentioned prior art. In order to meet the power requirements of the range hoods, the size of the fan will be selected as large as possible if the space size of the smoke box allows. However, during the actual installation of the fan, it will be found that since the shape of the fan is not a regular rectangular parallelepiped, nor is it similar to the shape of the smoke box, a large-sized fan is very easy to interfere with the components and / or wiring inside the smoke box, affecting the normal installation of the fan. On the contrary, in order for the fan to be successfully installed in the smoke box, only a small-sized fan can be selected. Based on the above analysis, it can be seen that this selection method will lead to a significant decrease in the power generation of the range hood. Therefore, in the prior art, it is difficult to take into account both the installation requirements and the power requirements of the fan.

[0033] In order to alleviate the above contradiction, the fan in this embodiment sets the second connection surface 13 to a plane, that is, the fan provided by this embodiment can be obtained by modifying the second connection surface 13 of the existing fan from a curved surface to a plane, and the size specifications of the fan before and after the modification remain unchanged, only the profile shape of the body 1 changes, specifically, the profile of the body 1 is concave after the modification compared to before the modification. It is easy to understand that the change in size has a more significant impact on the performance of the fan than the change in the profile shape, so the above modification method can keep the performance of the fan at a high level.

[0034] On this basis, the present embodiment further provides a range hood, including a smoke box and a fan installed in the smoke box, wherein the shape and size of the smoke box are consistent with the prior art, and the fan adopts the fan with a plane second connection surface 13 provided in the present embodiment. Similar to the prior art, the air outlet 2 is installed at the top inner wall of the smoke box, and the installation position of the air outlet 2 at the top inner wall of the smoke box, the installation position of other components in the smoke box, and the wiring position are also consistent with the prior art and do not need to be changed. For the fan provided in the present embodiment, it can utilize the gap between the planar second connection surface 13 and the inner wall of the smoke box so that the second connection surface 13 is spaced apart from the inner wall of the smoke box, thereby avoiding unnecessary interference between the main body 1 and the inner wall of the smoke box, and at the same time, utilizing the above-mentioned gap, the main body 1 can also avoid other components and wiring in the smoke box, thereby enabling the large-sized fan in the present embodiment to be smoothly installed in the smoke box.

[0035] In order to reduce the impact of the modification of the second connecting surface 13 on the performance of the fan, on the one hand, it is necessary to make the second connecting surface 13 tangent to the first spiral profile surface 12 and the second spiral profile surface 14 at the same time, and on the other hand, it is necessary to avoid changing the first spiral profile surface 12 and the second spiral profile surface 14, so that the profiles of the first spiral profile surface 12 and the second spiral profile surface 14 are still located on the same logarithmic spiral line.

[0036] The third connecting surface 15 can be composed of several planes and / or curved surfaces. If the third connecting surface 15 has curved surfaces, these curved surfaces are located on the same logarithmic spiral line as the first spiral profile surface 12 to avoid significant impact on the performance of the fan. If the third connecting surface 15 has a plane, the fan can further avoid other components and wiring in the smoke box. If the third connecting surface 15 includes both planes and curved surfaces, the planes and curved surfaces will be arranged in sequence, and adjacent planes and curved surfaces will be smoothly connected.

[0037] In this embodiment, the third connecting surface 15 includes only one plane, which is the first avoidance plane. The first avoidance plane is tangent to the second spiral profile surface 14 so that the first avoidance plane and the second spiral profile surface 14 are smoothly connected, and the first avoidance plane extends to the outer edge of the air outlet 2.

[0038] Preferably, based on the profile shape of the main body 1, in order to smoothly connect the first connecting surface 11 and the first spiral profile surface 12 to improve the performance of the fan, the first connecting surface 11 of this embodiment includes a first plane 111 and a first arc surface 112, and the two side edges of the first arc surface 112 are smoothly connected to the first plane 111 and the first spiral profile surface 12 respectively.

[0039] Based on the structural design of existing range hoods, there are many components and wirings inside the top of the smoke box, so the second connecting surface 13 is at least partially located between the rotating shaft of the impeller and the top inner wall of the smoke box to maximize the avoidance effect of the second connecting surface 13 on the internal components and wiring of the smoke box.

[0040] In order to enable the fan to absorb smoke normally, a smoke outlet is opened on the side wall of the smoke box of this embodiment, and the air inlet 3 is located at the smoke outlet. At the same time, the range hood also includes a smoke baffle, which is rotatably set on the smoke box to open and close the air inlet 3. After the smoke baffle is opened, smoke can enter the air inlet 3 through the smoke outlet.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A range hood, characterized in that: The invention comprises a smoke box and a fan installed in the smoke box, wherein the fan comprises an impeller and a fan volute, wherein the fan volute comprises a body (1) extending along a first spiral line, wherein an air outlet (2) is arranged at the rear end of the body (1), wherein the body (1) comprises a first connecting surface (11), a first spiral profile surface (12), a second connecting surface (13), a second spiral profile surface (14) and a third connecting surface (15) which are connected in sequence in the profile direction, wherein the second connecting surface (13) is a plane, wherein the edge of the first connecting surface (11) away from the first spiral profile surface (12) and the edge of the third connecting surface (15) away from the second spiral profile surface (14) are both located at the air outlet (2), wherein an air inlet (3) is arranged in the middle of the body (1), wherein the impeller is rotatably arranged in the air inlet (3), and wherein the second connecting surface (13) is spaced apart from the inner wall of the smoke box.

2. The range hood according to claim 1, characterized in that: The air outlet (2) is installed at the top inner wall of the smoke box, and the second connecting surface (13) is at least partially located between the rotating shaft of the impeller and the top inner wall of the smoke box.

3. The range hood according to claim 1, characterized in that: A smoking opening is provided on the side wall of the cigarette box, and the air inlet (3) is located at the smoking opening.

4. The range hood according to claim 3, characterized in that: The range hood further comprises a smoke baffle, which is rotatably arranged on the smoke box to open and close the air inlet (3).

5. The range hood according to claim 1, characterized in that: The second connecting surface (13) is tangent to both the first spiral profile surface (12) and the second spiral profile surface (14).

6. The range hood according to claim 5, characterized in that: The profiles of the first spiral profile surface (12) and the second spiral profile surface (14) are located on the same logarithmic spiral line.

7. The range hood according to claim 1, characterized in that: The third connecting surface (15) comprises a first avoidance plane, and the first avoidance plane is tangent to the second spiral profile surface (14), so that the first avoidance plane and the second spiral profile surface (14) are smoothly connected.

8. The range hood according to claim 1, characterized in that: The first connecting surface (11) comprises a first plane (111) and a first curved surface (112), and the two side edges of the first curved surface (112) are smoothly connected to the first plane (111) and the first spiral line surface (12) respectively.

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