A volute and a centrifugal fan and a range hood comprising the same

Abstract

This utility model provides a volute and a centrifugal fan and range hood including the volute. The volute includes a front side plate, a rear side plate, and a surrounding plate. The volute has a volute tongue at the air outlet. The front side plate and / or the rear side plate have a protruding structure extending arcuately around the center of the volute. The protruding structure includes a first part and a second part. The thickness of the first part gradually increases along the airflow path direction in the axial direction, and the thickness of the second part gradually decreases along the airflow path direction in the axial direction. The second part gradually extends to the air outlet along the airflow path direction. This volute and the centrifugal fan and range hood including the volute, without increasing the main body thickness of the volute, increase the cross-sectional area of ​​the airflow in the airflow path direction through the protruding structure, effectively reducing or eliminating airflow accumulation, avoiding eddies, and improving gas flowability, thereby improving the working efficiency and performance of the fan system.

Description

Technical Field

[0001] This utility model relates to the technical field of range hoods, and in particular to a volute housing and a centrifugal fan and range hood including the volute housing. Background Technology

[0002] Currently, the main method for designing and optimizing the volute of a range hood is to first determine the volute profile and then stretch and shape it. When there are size constraints on the fan system, the optimization method is often to cut the original volute profile and then perform a certain transition treatment at the connection between the curve and the cut straight line. Usually, the volute thickness needs to be designed to match the impeller height. The larger the impeller height, the better the fan system performance; however, due to the increased impeller height, the volute thickness also needs to be increased accordingly. However, increasing the volute thickness will compress the fluid flow space; therefore, the volute thickness cannot be increased arbitrarily.

[0003] In a volute design of a certain thickness, when a multi-blade centrifugal fan is running, the airflow inside the volute gradually accumulates along the flow direction. Especially after the airflow impacts the volute wall, it flows to both sides and accumulates there. The varying flow velocities also cause vortices to form on the side walls of the volute, reducing the efficiency of the fan system. Current technologies using volutes of uniform thickness cannot dynamically match the changes in cross-sectional area required by the accumulated airflow, resulting in either insufficient or excessive cross-sectional area in certain regions. Insufficient cross-sectional area leads to problems such as airflow compression, turbulence, energy loss, and abnormally increased noise. Excessive cross-sectional area results in material waste, reduced fan efficiency, and compression of the intake space.

[0004] Therefore, the existing technology's volute thickness design cannot match the accumulated airflow, resulting in the ineffective elimination of airflow vortices within the volute, reducing the working efficiency of the fan system, and affecting the performance of the range hood. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of the prior art and provide a volute and a centrifugal fan and range hood including the volute.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A volute includes a front side plate, a rear side plate, and a surrounding plate connected to the front and rear side plates. The volute has a volute tongue at the air outlet. Airflow flows within the volute along the inner wall of the surrounding plate from the volute tongue to the air outlet. The front and / or rear side plates have a protruding structure extending arcuately around the center of the volute. The protruding structure includes a first part and a second part. The thickness of the first part gradually increases along the airflow path direction in the axial direction, and the thickness of the second part gradually decreases along the airflow path direction in the axial direction. The second part gradually extends to the air outlet along the airflow path direction.

[0008] In this design, the volute casing, through its front and rear side plates, defines the thickness of the impeller mounting area. This allows the protruding structures, without increasing the overall thickness of the volute casing, to create a shape that first increases and then decreases in thickness along the inner wall of the volute casing. This widens the space between the impeller sides and the volute casing sidewalls at localized locations, increasing the cross-sectional area of ​​the airflow path. This effectively reduces or eliminates airflow accumulation, avoids eddies, and improves gas flowability, thereby enhancing the efficiency and performance of the fan system. Specifically, the gradually increasing thickness of the first section effectively eliminates the compression and impact of gradually accumulating airflow on the volute casing sidewalls; while the gradually decreasing thickness of the second section, extending to the outlet, accommodates the gradual decrease in airflow rate as it approaches the outlet, further reducing the overall thickness of the volute casing.

[0009] Preferably, the cross-section of the volute perpendicular to its axial direction is divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant along the airflow path, wherein the first quadrant is the starting quadrant near the volute tongue; and the maximum thickness of the protrusion structure in the axial direction is located within the region of the third quadrant.

[0010] In this design, the volute has the maximum thickness of the protrusion structure located in the third quadrant, matching the maximum flow rate accumulated by the airflow in the third quadrant.

[0011] Preferably, the starting position of the first part along the airflow path direction is located within the region of the second quadrant.

[0012] In this design, the volute is configured such that the flow cross-sectional area inside the volute is adapted to allow the gas flow rate to gradually increase in the second quadrant.

[0013] Preferably, the rate at which the thickness of the first portion gradually increases along the airflow path direction in the axial direction is set to match the cumulative flow rate of the airflow within the volute.

[0014] In this solution, the above settings match the flow cross-sectional area inside the volute with the rate of gas flow accumulation, effectively eliminating the squeezing and impact of airflow on the sidewall of the volute without making the volute too thick.

[0015] Preferably, the thickness of the first portion in the axial direction gradually increases at a linear rate along the airflow path direction.

[0016] In this design, the thickness of the first part gradually increases at a linear rate, making the shape of the first part regular and easy to manufacture.

[0017] Preferably, the front side panel and / or the rear side panel includes a basic plane and a protruding structure protruding from the basic plane, wherein the top surface of the protruding structure protruding from the basic plane is planar.

[0018] In this design, the top surface of the protruding structure adopts a planar structure, which increases the internal space corresponding to the protruding structure. This helps to reduce the compression and impact of airflow on the inner wall of the volute, thereby improving gas flow.

[0019] Preferably, the protruding structure has a smooth transition with the basic plane.

[0020] Preferably, the basic plane has a central hole, and the inner diameter of the protruding structure along the radial direction of the volute is larger than the diameter of the central hole.

[0021] In this solution, by using the above-mentioned configuration, while the protruding structure can be used to eliminate the compression and impact of airflow accumulation on the inner wall of the volute, the basic plane of the front side plate and / or the rear side plate can still serve as the reference plane for installing other components of the fan without increasing the main thickness of the volute. That is, the reference plane for installing other components will not have to be enlarged due to the protruding structure.

[0022] A centrifugal fan includes a volute as described above and an impeller disposed within the volute. The protruding structure is provided on the front side plate, and the motor of the centrifugal fan is provided on the rear side plate.

[0023] In this design, the centrifugal fan, through the aforementioned volute, increases the cross-sectional area of ​​the airflow in the airflow path direction by means of a protruding structure without increasing the thickness of the volute itself. This effectively reduces or eliminates airflow accumulation, avoids eddies, and improves gas flowability, thereby improving the working efficiency and performance of the fan system.

[0024] A range hood, the range hood comprising a centrifugal fan as described above.

[0025] In this solution, the range hood, through the aforementioned centrifugal fan, increases the cross-sectional area of ​​the airflow in the airflow path direction by means of a protruding structure without increasing the thickness of the volute, effectively reducing or eliminating airflow accumulation, avoiding eddies, and improving gas flowability, thereby improving the working efficiency and performance of the fan system.

[0026] The positive and progressive effects of this utility model are as follows: without increasing the thickness of the main body of the volute, the centrifugal fan and range hood including it increase the cross-sectional area of ​​the airflow in the airflow path direction through the protruding structure, effectively reduce or eliminate airflow accumulation, avoid eddies, improve gas flowability, and thus improve the working efficiency and performance of the fan system. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the volute structure of Embodiment 1 of this utility model.

[0028] Figure 2 This is a front view of the volute of Embodiment 1 of this utility model.

[0029] Figure 3 for Figure 2 A bottom view.

[0030] Figure 4 for Figure 2 The left view.

[0031] Explanation of reference numerals in the attached figures:

[0032] Snail shell 1

[0033] Front side panel 2

[0034] Protrusion structure 3

[0035] Part 1, Chapter 31

[0036] Part 2, 32

[0037] Basic Plane 4

[0038] Center hole 41

[0039] Rear side panel 5

[0040] Enclosure 6

[0041] Cochlear tongue 7

[0042] Air inlet 8

[0043] Air outlet 9

[0044] First Quadrant 10

[0045] Second Quadrant 11

[0046] Third Quadrant 12

[0047] Quadrant 13

[0048] Airflow path direction A

[0049] Axial B of the volute Detailed Implementation

[0050] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0051] Example 1

[0052] This embodiment provides a volute 1, which is the housing of a centrifugal fan, and an impeller (not shown in the figure) is provided inside the volute 1.

[0053] like Figures 1-4 As shown, the volute 1 includes a front side plate 2, a rear side plate 5, and a surrounding plate 6 connecting the front side plate 2 and the rear side plate 5. The volute 1 is provided with a volute tongue 7 at the air outlet 9. The airflow flows from the volute tongue 7 to the air outlet 9 along the inner wall of the surrounding plate 6 inside the volute 1.

[0054] The front side plate 2 and / or the rear side plate 5 are provided with a protruding structure 3 extending in an arc around the center of the volute 1. The protruding structure 3 includes a first part 31 and a second part 32. The thickness of the first part 31 in the axial direction B gradually increases along the airflow path direction A, and the thickness of the second part 32 in the axial direction gradually decreases along the airflow path direction A. The second part 32 gradually extends along the airflow path direction A to the air outlet 9.

[0055] Specifically, in this embodiment, a protruding structure 3 is provided only on one side plate of the volute 1. For example, a protruding structure 3 is provided on the front side plate 2, and a large circular hole is opened on the front side plate 2, which is an air inlet 8; the motor of the centrifugal fan (not shown in the figure) is installed on the rear side plate 5. In other embodiments, depending on the desired effect, a protruding structure 3 may be provided on both the front side plate 2 and the rear side plate 5.

[0056] The volute 1, through the front side plate 2 and the rear side plate 5, defines the thickness of the impeller mounting area. Thus, without increasing the overall thickness of the volute 1, the protruding structure 3 creates a shape that first increases and then decreases along the thickness direction on the inner wall of the volute 1. This widens the space from the impeller sides to the sidewalls of the volute 1 at local locations, increasing the cross-sectional area of ​​the airflow path. This effectively reduces or eliminates airflow accumulation, avoids eddies, and improves gas flow, thereby enhancing the efficiency and performance of the fan system. Specifically, the gradually increasing thickness of the first part 31 effectively eliminates the compression and impact of gradually accumulating airflow on the sidewalls of the volute 1; while the gradually decreasing thickness of the second part 32 extends to the outlet 9, adapting to the situation where the airflow gradually decreases as it approaches the outlet 9, and also contributing to reducing the overall thickness of the volute 1.

[0057] Among them, such as Figure 2 As shown, the cross-section of the volute 1 perpendicular to its axial direction is divided into four quadrants: the first quadrant 10, the second quadrant 11, the third quadrant 12, and the fourth quadrant 13 along the airflow path. The first quadrant 10 is the starting quadrant close to the volute tongue 7. The maximum thickness of the protruding structure 3 in the axial direction is located in the region of the third quadrant 12. With this structural arrangement, the position of the maximum flow cross-sectional area in the volute 1 matches the maximum flow rate accumulated in the third quadrant 12.

[0058] The starting position of the first part 31 along the airflow path is set in the region of the second quadrant 11. In this way, the flow cross-sectional area inside the volute 1 gradually increases in the region of the second quadrant 11, which is adapted to the situation where the gas flow rate gradually increases in the second quadrant 11.

[0059] In designing the gradual rate of the first part 31, it is preferable to set the gradual rate at which the thickness of the first part 31 gradually increases along the airflow path to match the cumulative flow rate of the airflow inside the volute 1, so that the flow cross-sectional area inside the volute 1 matches the cumulative flow rate of the gas flow, effectively eliminating the squeezing and impact of the airflow on the side wall of the volute 1, while also preventing the thickness of the volute 1 from being too thick.

[0060] More preferably, the thickness of the first portion 31 in the axial direction gradually increases at a linear rate along the airflow path. The linearly increasing thickness of the first portion 31 makes its shape regular and easier to manufacture.

[0061] like Figure 1 and Figure 2As shown, the front side plate 2 includes a basic plane 4 and a protruding structure 3 protruding from the basic plane 4. The top surface of the protruding structure 3 protruding from the basic plane 4 is flat. In other embodiments, the shape of the protruding structure 3 can vary. For example, some protruding structures 3 can be conical in their radial cross-section. However, compared to conical structures or other shapes, the top surface of the protruding structure 3 in this embodiment is flat, which increases the internal space corresponding to the protruding structure 3. This helps to reduce the compression and impact of airflow on the inner wall of the volute 1, thereby improving gas flow.

[0062] The smooth transition between the protruding structure 3 and the basic plane 4 avoids sharp angles at the junction of the protruding structure 3 and other parts of the inner wall of the volute 1, which would hinder the flow of gas. Therefore, the smooth transition is beneficial to the good flow of gas.

[0063] The basic plane 4 has a central hole 41. The inner diameter of the protruding structure 3 along the radial direction of the volute 1 is larger than the diameter of the central hole 41. That is, the protruding structure 3 is an arc-shaped protruding structure 3, but it is not a protrusion on the entire annular surface of the front side plate 2, but only a protrusion on a part of the surface area. In this way, while the protruding structure 3 can be used to eliminate the compression and impact of airflow accumulation on the inner wall of the volute 1, the basic plane 4 of the front side plate 2 can still serve as a reference plane for installing other components of the fan without increasing the main body thickness of the volute 1. That is, the reference plane for installing other components will not have to be enlarged because of the protruding structure 3.

[0064] This embodiment also provides a centrifugal fan, which includes the aforementioned volute 1 and an impeller disposed within the volute 1. A protruding structure 3 is provided on the front side plate 2, and a motor for the centrifugal fan is disposed on the rear side plate 5. This centrifugal fan, through the aforementioned volute 1, increases the cross-sectional area of ​​the airflow in the airflow path direction via the protruding structure 3 without increasing the main body thickness of the volute 1, effectively reducing or eliminating airflow accumulation, avoiding eddies, and improving gas flowability, thereby improving the working efficiency and performance of the fan system.

[0065] Example 2

[0066] This embodiment provides a range hood that includes a centrifugal fan as described in Embodiment 1. By using the centrifugal fan as described in Embodiment 1, without increasing the main body thickness of the volute 1, the range hood increases the cross-sectional area of ​​the airflow in the airflow path direction through the protruding structure 3, effectively reducing or eliminating airflow accumulation, avoiding eddies, and improving gas flowability, thereby improving the working efficiency and performance of the fan system.

[0067] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A volute, the volute comprising a front side plate, a rear side plate, and a surrounding plate connecting the front side plate and the rear side plate, the volute having a volute tongue at an air outlet, wherein airflow flows within the volute along the inner wall of the surrounding plate from the volute tongue towards the air outlet, characterized in that, The front side plate and / or the rear side plate are provided with a protruding structure extending in an arc around the center of the volute. The protruding structure includes a first part and a second part. The thickness of the first part in the axial direction of the volute gradually increases along the airflow path direction, and the thickness of the second part in the axial direction gradually decreases along the airflow path direction. The second part gradually extends to the air outlet along the airflow path direction.

2. The volute as described in claim 1, characterized in that, The cross-section of the volute perpendicular to its axial direction is divided into four quadrants in sequence along the airflow path: the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant. The first quadrant is the starting quadrant closest to the volute tongue. The maximum thickness of the protruding structure in the axial direction is located within the region of the third quadrant.

3. The volute as described in claim 2, characterized in that, The starting position of the first part along the airflow path direction is located within the region of the second quadrant.

4. The volute as described in claim 1, characterized in that, The rate at which the thickness of the first portion gradually increases along the airflow path direction in the axial direction is set to match the cumulative flow rate of the airflow within the volute.

5. The volute as described in claim 4, characterized in that, The thickness of the first portion in the axial direction gradually increases at a linear rate along the airflow path direction.

6. The volute as described in claim 1, characterized in that, The front panel and / or the rear panel include a basic plane and a protruding structure protruding from the basic plane, wherein the top surface of the protruding structure protruding from the basic plane is planar.

7. The volute as described in claim 6, characterized in that, The protruding structure transitions smoothly with the basic plane.

8. The volute as described in claim 6, characterized in that, The basic plane has a central hole, and the inner diameter of the protruding structure along the radial direction of the volute is larger than the diameter of the central hole.

9. A centrifugal fan, characterized in that, The centrifugal fan includes a volute as described in any one of claims 1-8 and an impeller disposed within the volute. The protruding structure is provided on the front side plate, and the motor of the centrifugal fan is provided on the rear side plate.

10. A range hood, characterized in that, The range hood includes the centrifugal fan as described in claim 9.

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