Volute structure and range hood comprising same

Abstract

The utility model provides a volute structure and a range hood comprising the same, the volute structure comprises a volute front plate, a volute rear plate, an annular wall and a volute tongue, the volute structure comprises an air outlet unit, the air outlet unit is arranged at the volute tongue and located on the peripheral side of the volute structure, the air outlet unit is arranged in the extension direction of the volute tongue, and the air outlet unit is arranged in the volute tongue. The two opposite sides, corresponding to the tip end of the volute tongue, of the annular wall are each provided with an air outlet groove, rectification parts are arranged in the volute structure and correspond to the air outlet grooves, the rectification parts are arranged in the extending direction of the annular wall, and the air outlet unit conveys air flow to the rectification parts through the air outlet grooves. And the air flow guided out of the air outlet groove can flow in the extending direction of the rectifying part to form an air curtain. The two air outlet grooves are matched with the rectification part to form a complete air curtain, the rectification effect is improved, static pressure at an outlet of the volute structure is increased, vortexes are eliminated, impact on the wall face of the volute is reduced, and therefore the effects of reducing resistance and noise are achieved.

Description

Technical Field

[0001] The utility model particularly relates to a volute structure and a range hood comprising the same. Background Art

[0002] Multi-blade centrifugal fans are widely used in ventilation equipment such as range hoods due to their compact structure, high pressure coefficient, large flow coefficient, and low noise. Currently, multi-blade centrifugal fans used in range hoods generally have low efficiency and high noise levels. Researchers have found that the intense interaction between the volute tongue and the impeller outlet is a major contributor to high centrifugal fan noise. Therefore, one of the primary approaches to reducing fan noise is to improve the volute tongue structure. Variations in the volute tongue clearance and shape often significantly impact fan performance and noise. The volute tongue clearance is typically categorized as flat, short, deep, or pointed. Variations in the volute tongue clearance alter the amount of gas recirculation within the volute and the impact of gas on the volute tongue, which in turn affects fan efficiency and noise. Research on volute tongue shape modification has primarily focused on reducing fan noise using methods such as tilted volute tongues, stepped volute tongues, sharkskin-like volute tongues, and volute tongue silencers. However, these methods have not addressed the associated issues of high noise reduction costs, reduced airflow, and increased energy consumption.

[0003] While the noise and efficiency of traditional volute tongues vary slightly with the gap between them, the backflow at the volute outlet and the strong impact of the airflow on the tongue remain essentially unchanged. While changes to the tongue's shape, such as tilting it, can increase the airflow impact area and relatively reduce pressure pulsation, thereby reducing noise, they can also lead to problems such as air volume loss and reduced efficiency. Shark-skin-like volute tongues reduce gas backflow and flow resistance, but their manufacturing is complex and costly. Furthermore, all of these methods involve gas impacting the wall, creating a diversion, but this still results in a certain degree of gas energy loss, and the underlying nature of this energy loss remains unchanged. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of large resistance, large backflow and large noise at the volute tongue in the prior art, and to provide a volute structure and a range hood including the same.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A volute structure, comprising a volute front plate, a volute rear plate, an annular wall and a volute tongue, and further comprising:

[0007] An air outlet unit is arranged at the volute tongue and is located on the outer peripheral side of the volute structure. Along the extension direction of the volute tongue, an air outlet groove is provided on each opposite side of the annular wall corresponding to the tip of the volute tongue. A rectifying portion is provided in the volute structure corresponding to the air outlet groove. The rectifying portion is arranged along the extension direction of the annular wall. The air outlet unit transports airflow to the rectifying portion through the air outlet groove, so that the airflow derived from the air outlet groove can flow along the extension direction of the rectifying portion and form a wind curtain.

[0008] In this solution, an air outlet unit is provided to actively blow air toward the tongue, increasing the wind pressure there. This in turn forms a small wind curtain on the tongue surface within the volute structure. When the air flowing out of the volute blows toward the tongue, it is first affected by the wind curtain on the tongue surface and diverted to both sides. The wind curtain also provides a certain degree of resistance to high-speed airflow impacting the tongue, effectively reducing pressure pulsation on the tongue surface and, in turn, reducing the noise of the fan system. Furthermore, by forming a wind curtain on the tongue surface, the tongue is indirectly deepened, allowing the gas within the volute to separate earlier, thereby improving the operating efficiency of the fan system containing this volute structure. In addition, two air outlet slots are provided to cooperate with the rectification part to form a complete wind curtain, improve the rectification effect, increase the static pressure at the outlet of the volute structure, and eliminate vortices. When the airflow continues to circulate in the volute along the volute tongue, the gas flowing at high speed along the wall can first disturb the near-wall boundary layer, thereby reducing the resistance; at the same time, it can also induce a small amount of gas circulating in the volute structure to change the direction of the airflow, reducing the impact on the volute wall, thereby reducing the resistance and noise.

[0009] Preferably, the size of the air outlet slot along the extension direction of the annular wall is 4-6 mm.

[0010] In this solution, the above arrangement is used to avoid the air outlet slot being too wide, which may cause gas leakage from the air outlet slot when the outlet back pressure of the volute structure is high, thereby reducing the efficiency of the fan system.

[0011] Preferably, the distance between the rectifying portion and the annular wall is 2-6 mm.

[0012] In this solution, the above-mentioned settings are used to ensure the drag and noise reduction effects of the wind curtain.

[0013] Preferably, the rectifying portion is a rectifying plate, and a guide surface is provided on one side of the rectifying plate corresponding to the air outlet slot along the extending direction of the annular wall, and the size of the guide surface is larger than the size of the air outlet slot.

[0014] In this solution, an air curtain is formed through the above arrangement.

[0015] Preferably, the cross section of the rectifying plate is an arc-shaped structure.

[0016] In this solution, through the above-mentioned setting, on the basis of ensuring the flow direction of the wind curtain, compared with other shapes, the impact on the airflow in the volute structure is smaller, thereby avoiding reducing the working efficiency of the fan system including the volute structure.

[0017] Preferably, the air outlet slot extends from the volute front plate to the volute rear plate.

[0018] In this solution, the above-mentioned arrangement is adopted to ensure the amount of air entering the volute structure.

[0019] Preferably, the rectification portion extends from the volute front plate to the volute rear plate.

[0020] In this solution, the above-mentioned arrangement is used to ensure effective rectification of the airflow entering the volute structure, thereby preventing the airflow from generating resistance to the airflow flowing in the volute structure.

[0021] Preferably, the air outlet unit includes a fan, which is arranged at the volute tongue through the top plate of the range hood. A plurality of blades are arranged at intervals on the fan, and the outer edge size of the blades is smaller than the size of the volute tongue.

[0022] In this solution, the above arrangement is used to achieve simultaneous blowing of air to the two air outlet slots while avoiding interference with the volute.

[0023] Preferably, the fan extends from the volute front plate to the volute rear plate.

[0024] In this solution, the above-mentioned arrangement is used to ensure the air volume blown into the volute structure.

[0025] A range hood comprises the volute structure described above.

[0026] In this embodiment, the range hood includes the aforementioned volute structure, which reduces the air outlet resistance of the fan system containing the volute structure and reduces noise during use. Furthermore, it increases the static pressure at the volute outlet and redirects the gas flowing back from the volute outlet, thereby achieving a rectifying effect. This approach effectively increases the static pressure at the outlet and eliminates vortices, improving efficiency.

[0027] The positive progress of this utility model is that: by providing an air outlet unit, this utility model actively blows air toward the tongue, increasing the wind pressure at the tongue, and then forming a small wind curtain on the surface of the tongue within the volute structure. When the wind flowing out of the volute blows toward the tongue, it will first be affected by the wind curtain on the tongue surface and diverted to both sides. The wind curtain will also have a certain resistance to the high-speed airflow impacting the tongue, effectively reducing the pressure pulsation on the tongue surface, thereby reducing the noise of the fan system. On the other hand, by forming the wind curtain on the tongue surface, the tongue is indirectly deepened, allowing the gas in the volute to separate in advance, and on the other hand, improving the working efficiency of the fan system containing the volute structure. In addition, two air outlet slots are provided to cooperate with the rectification part to form a complete wind curtain, improve the rectification effect, increase the static pressure at the outlet of the volute structure, and eliminate vortices. When the airflow continues to circulate in the volute along the volute tongue, the gas flowing at high speed along the wall can first disturb the near-wall boundary layer, thereby reducing the resistance; at the same time, it can also induce a small amount of gas circulating in the volute structure to change the direction of the airflow, reducing the impact on the volute wall, thereby reducing the resistance and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a three-dimensional diagram of the volute structure of a preferred embodiment of the present invention.

[0029] Figure 2 This is a diagram showing the positional relationship between the air outlet unit and the volute tongue of a preferred embodiment of the present invention.

[0030] Figure 3 for Figure 2 A partial enlarged view of .

[0031] Figure 4 This is a diagram showing the positional relationship between the rectifying portion and the annular wall of a preferred embodiment of the present invention.

[0032] Description of reference numerals:

[0033] Air outlet unit 1

[0034] Fan 11

[0035] Blade 12

[0036] Air outlet 2

[0037] Rectification unit 3

[0038] Volute front plate 10

[0039] Volute rear plate 20

[0040] Ring wall 30

[0041] Snail tongue 40

[0042] Tip 41

[0043] Top plate 50

[0044] Volute structure 100 DETAILED DESCRIPTION

[0045] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0046] This embodiment provides a volute structure 100, the specific structure is as follows Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the volute structure 100 includes a volute front plate 10, a volute rear plate 20, an annular wall 30 and a volute tongue 40. The volute structure 100 also includes:

[0047] The air outlet unit 1 is arranged at the volute tongue 40 and is located on the outer peripheral side of the volute structure 100. Along the extension direction of the volute tongue 40, an air outlet slot 2 is provided on each opposite side of the annular wall 30 corresponding to the tip 41 of the volute tongue 40. A rectifying portion 3 is provided corresponding to the air outlet slot 2 in the volute structure 100. The rectifying portion 3 is arranged along the extension direction of the annular wall 30. The air outlet unit 1 transports airflow to the rectifying portion 3 through the air outlet slot 2, so that the airflow derived from the air outlet slot 2 can flow along the extension direction of the rectifying portion 3 and form a wind curtain.

[0048] Specifically, the volute structure 100 is covered on the outer peripheral side of the impeller of the fan system, the volute front plate 10 and the volute rear plate 20 are arranged at intervals, and a sealed air duct is formed by the annular wall 30. The volute 40 is formed by the bending of the volute front plate 10 and the volute rear plate 20 themselves. The impeller rotates and discharges the air flow from the outlet of the volute structure 100 through the air duct. This is the existing technology and will not be elaborated on here. An air outlet unit 1 is further provided on the outer peripheral side of the volute structure 100. The air outlet unit 1 corresponds to the arc structure formed by the volute tongue 40. The air outlet unit 1 is used to supply airflow into the volute structure 100 to achieve active blowing toward the volute tongue and increase the wind pressure at the volute tongue. An air outlet slot 2 is provided on the annular wall 30. There are two air outlet slots 2, and the two air outlet slots 2 are provided on opposite sides of the tip 41 of the volute tongue 40 to blow air into the volute structure 100 from different directions. Correspondingly, a rectifying portion 3 is provided in the volute structure 100 corresponding to the air outlet slot 2. The rectifying portion 3 is used to change the direction of the airflow entering the volute structure 100. The two The air outlet slot 2 cooperates with the two rectifying parts 3 to form a complete wind curtain at the tip 41 of the volute tongue 40. Compared with setting an opening to actively blow air into the volute structure 100, the wind curtain has a larger range, improves the rectification effect, and increases the static pressure at the outlet of the volute structure 100, eliminating vortices. When the airflow continues to circulate in the volute structure 100 along the volute tongue 40, the gas flowing at high speed along the wall can first disturb the near-wall boundary layer, thereby reducing the resistance; at the same time, it can also induce a small part of the gas circulating in the volute structure 100 to change the direction of the airflow, reducing the impact on the wall of the volute 40, thereby reducing the resistance and noise.

[0049] It is understandable that when the wind flowing out of the volute structure 100 blows towards the tongue 40, it will first be affected by the wind curtain on the surface of the tongue 40 and diverted to both sides of the tip 41. The wind curtain will have a certain resistance to the high-speed airflow impacting the tongue 40, which can effectively reduce the pressure pulsation on the surface of the tongue 40, thereby reducing the noise of the fan system including the volute structure 100. On the other hand, by forming a wind curtain on the surface of the tongue 40, the tongue 40 is indirectly deepened. Compared with the smaller radius of the tongue 40, that is, the deeper the tongue 40, the more conducive it is for the gas in the volute structure 100 to separate and flow to the outlet in advance, reducing the gas circulating in the volute structure 100 can effectively improve the efficiency of the fan system and cause the pressure pulsation at the tongue 40 to increase sharply, greatly increasing the noise of the fan system. In this way, not only can the gas in the volute structure 100 be separated in advance, but the noise of the fan system can also be reduced, while at the same time improving the working efficiency of the fan system including the volute structure 100.

[0050] In this embodiment, the dimension of the air outlet slot 2 along the extension direction of the annular wall 30 is 4-6 mm.

[0051] Specifically, the dimension of the air outlet slot 2 along the extension direction of the annular wall 30 is the width dimension of the air outlet slot 2. By limiting the width of the air outlet slot 2, it is possible to avoid the air outlet slot 2 being too wide, which can easily cause gas leakage from the air outlet slot 2 when the outlet back pressure of the volute structure 100 is high, thereby reducing the efficiency of the fan system. It is understandable that the width of the air outlet slot 2 can be analyzed using finite element software in the prior art, that is, using different slot widths to analyze the outlet airflow of the volute structure 100 to obtain the above range. This is a prior art and will not be elaborated on here.

[0052] Furthermore, the distance between the rectifying portion 3 and the annular wall 30 is 2-6 mm.

[0053] Specifically, the rectifying portion 3 is arranged corresponding to the air outlet slot 2 and is parallel to the annular wall 30. The spacing between the rectifying portion 3 and the annular wall 30 is 1 / 2 of the slot width of the air outlet slot 2 to one times the slot width, that is, 2~6mm. It should be noted that the distance between the rectifying portion 3 and the annular wall 30 corresponding to the volute tongue 40 should not be too large or too small, otherwise it will easily lead to poor wind curtain effect, thereby ensuring the drag reduction and noise reduction effect of the wind curtain.

[0054] In this embodiment, the rectifying portion 3 is a rectifying plate. A guide surface is provided on one side of the rectifying plate corresponding to the air outlet slot 2 along the extending direction of the annular wall 30 . The size of the guide surface is larger than the size of the air outlet slot 2 .

[0055] Specifically, the cross-section of the rectifier plate is an arc-shaped structure, that is, the rectifier plate is an arc-shaped plate, and the rectifier plate has the same shape as the annular wall 30. The rectifier plate forms a guide surface on the side facing the air outlet slot 2, and the size of the guide surface is larger than the size of the air outlet slot 2, thereby enabling the rectifier portion 3 to effectively rectify the airflow blown into the air outlet slot 2, and prevent the airflow blown into the volute structure 100 from the air outlet slot 2 when the rectifier portion 3 is smaller than the air outlet slot 2 from directly disturbing the airflow circulating in the volute structure 100, thereby increasing the exhaust resistance of the volute structure 100. In addition, it can be understood that, on the basis of ensuring the flow direction of the air curtain, the surface cross-section of the side of the arc-shaped plate away from the guide surface is an arc-shaped structure compared to rectifier plates of other shapes, so as to have a smaller impact on the airflow in the volute structure 100, thereby avoiding reducing the working efficiency of the fan system including the volute structure 100.

[0056] In this embodiment, the air outlet slot 2 extends from the volute front plate 10 to the volute rear plate 20. Compared to a case where both ends of the air outlet slot 2 are located between the volute front plate and the volute rear plate 20, the air outlet slot 2 extending from the volute front plate 10 to the volute rear plate 20 is longer, thereby ensuring that sufficient air enters the volute structure 100 when the air outlet unit 1 actively blows air into the air outlet slot 2.

[0057] Similarly, the rectifying portion 3 corresponding to the air outlet slot 2 also extends from the volute front plate 10 to the volute rear plate 20, ensuring effective rectification of the airflow entering the volute structure 100, so as to form a wind curtain while avoiding direct disturbance of the airflow with the airflow circulating in the volute structure 100, thereby reducing the resistance to airflow outflow.

[0058] In this embodiment, the air outlet unit 1 includes a fan 11, which is arranged at the volute tongue 40 through the top plate 50 of the range hood. A plurality of blades 12 are arranged at intervals on the fan 11, and the outer edge size of the blades 12 is smaller than the size of the volute tongue 40.

[0059] Specifically, the fan 11 can be a multi-blade centrifugal fan or an axial flow fan as known in the art, and will not be described in detail here. A plurality of blades 12 are radially spaced apart on the output shaft of the fan 11, so that when the output shaft rotates, the blades 12 are driven to actively blow air toward the air outlet slots 2. Since the air outlet unit 1 is disposed at the volute tongue 40 and located on the outer periphery of the volute structure 100, the outer edges of the blades 12 are configured to be smaller than the volute tongue 40 itself. This prevents interference with the volute structure 100 when blowing air toward both air outlet slots 2 simultaneously.

[0060] In this embodiment, the fan 11 extends from the volute front plate 10 to the volute rear plate 20. Since the air outlet slots 2 and the rectifying portion 3 both extend from the volute front plate 10 to the volute rear plate 20, to ensure sufficient airflow into the volute structure, the output axis direction of the fan 11 is aligned with the length direction of the air outlet slots 2 and the rectifying portion 3, and the length dimensions are consistent. This ensures sufficient airflow into the volute structure 100 and avoids the situation where the fan 11 is too small and part of the air outlet slots 2 and the rectifying portion 3 do not form an air curtain.

[0061] This embodiment also provides a range hood including the aforementioned volute structure 100. This reduces the air outlet resistance of the fan system incorporating the volute structure 100, while also lowering noise during use. Furthermore, the static pressure at the outlet of the volute structure 100 is increased while redirecting the gas flowing back from the outlet, thereby achieving a rectifying effect. This approach effectively increases the static pressure at the outlet, eliminates vortices, and improves efficiency.

[0062] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A volute structure, comprising a volute front plate, a volute rear plate, an annular wall and a volute tongue, characterized in that: The volute structure also includes: An air outlet unit is arranged at the volute tongue and is located on the outer peripheral side of the volute structure. Along the extension direction of the volute tongue, an air outlet groove is provided on each opposite side of the annular wall corresponding to the tip of the volute tongue. A rectifying portion is provided in the volute structure corresponding to the air outlet groove. The rectifying portion is arranged along the extension direction of the annular wall. The air outlet unit transports airflow to the rectifying portion through the air outlet groove, so that the airflow derived from the air outlet groove can flow along the extension direction of the rectifying portion and form a wind curtain.

2. The volute structure according to claim 1, characterized in that: The size of the air outlet slot along the extension direction of the annular wall is 4-6 mm.

3. The volute structure according to claim 2, characterized in that: The distance between the rectifying portion and the annular wall is 2-6 mm.

4. The volute structure according to claim 1, wherein: The rectifying portion is a rectifying plate, and a guide surface is provided on one side of the rectifying plate corresponding to the air outlet slot along the extending direction of the annular wall. The size of the guide surface is larger than the size of the air outlet slot.

5. The volute structure according to claim 4, characterized in that: The cross section of the rectifier plate is an arc-shaped structure.

6. The volute structure according to claim 1, characterized in that: The air outlet slot extends from the volute front plate to the volute rear plate.

7. The volute structure according to claim 6, characterized in that: The rectification portion extends from the volute front plate to the volute rear plate.

8. The volute structure according to claim 7, characterized in that: The air outlet unit includes a fan, which is arranged at the volute tongue through the top plate of the range hood. A plurality of blades are arranged on the fan at intervals, and the outer edge size of the blades is smaller than the size of the volute tongue.

9. The volute structure according to claim 8, characterized in that: The fan extends from the volute front plate to the volute rear plate.

10. A range hood, characterized in that: The range hood comprises a volute structure according to any one of claims 1 to 9.

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