CN218177573U - Flow guiding and noise reducing device and range hood - Google Patents
Flow guiding and noise reducing device and range hood Download PDFInfo
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- CN218177573U CN218177573U CN202222855612.1U CN202222855612U CN218177573U CN 218177573 U CN218177573 U CN 218177573U CN 202222855612 U CN202222855612 U CN 202222855612U CN 218177573 U CN218177573 U CN 218177573U
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Abstract
The application relates to the field of kitchen equipment, in particular to a flow guide and noise reduction device and a range hood. One side of the flow guiding and noise reducing device forms a flow guiding surface to flow and guide the incoming smoke from the smoke collecting cavity of the range hood; the other side of the flow guide and noise reduction device is arranged at the bottom of a volute of a centrifugal fan of the range hood, and the curvature of the flow guide surface is consistent with that of the molded line of the volute; cutting the section of the flow guide and noise reduction device along a preset plane to form a first airfoil structure, wherein the preset plane is a plane in which the radius direction of the volute and the width direction of a coaming of the volute are located; the leading edge of the first airfoil structure faces the motor side of the centrifugal fan and the trailing edge of the first airfoil structure faces the opposite side of the motor side. The flow-guiding noise-reducing device provided by the application adopts a wing-shaped structure, so that the sufficient air inlet volume and the uniformity of a flow field of an air duct air inlet are ensured, and the airflow disorder at the air duct air inlet is reduced; and the smoke flow of the main air inlet and the auxiliary air inlet can be balanced, so that the pneumatic noise of the range hood is reduced.
Description
Technical Field
The application relates to the field of kitchen equipment, in particular to a flow guide and noise reduction device and a range hood.
Background
During the operation of the cigarette machine, the smoke gas flow entering the smoke collecting cavity flows through the lower part of the air duct, and the smoke gas flow at the position is influenced by different negative pressures of the main air inlet and the auxiliary air inlet of the air duct, so that the smoke gas flow is divided and respectively diffused and flows to two sides. Because of the existence of the motor and the wind-blocking ring of the centrifugal fan, the resistance at the auxiliary air inlet is overlarge, which causes higher turbulence of the air flow, thereby generating air flow fluctuation noise.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a flow-guiding and noise-reducing device and a range hood, which are used for shunting and guiding smoke entering an air duct from a smoke collecting cavity so as to reduce air flow turbulence and further reduce noise.
The application provides a flow guiding and noise reducing device which is used for a range hood, wherein a flow guiding surface is formed on one side of the flow guiding and noise reducing device so as to divide and guide the incoming flow of smoke from a smoke collecting cavity of the range hood; the other side of the flow guide noise reduction device is arranged at the bottom of a volute of a centrifugal fan of the range hood, and the curvature of the flow guide surface is consistent with that of the molded line of the volute;
cutting the section of the flow guide and noise reduction device along a preset plane to form a first airfoil structure, wherein the preset plane is a plane in which the radius direction of the volute and the width direction of a coaming of the volute are located;
the leading edge of the first airfoil structure faces a motor side of the centrifugal fan and the trailing edge of the first airfoil structure faces an opposite side of the motor side.
In the above technical solution, further, a mounting surface is formed on a side of the flow guide and noise reduction device departing from the flow guide surface, and the mounting surface is a curved surface and is attached to and connected with the outer peripheral surface of the enclosing plate.
In the above technical solution, further, the flow guide surface correspondingly forms a circular arc section and a first straight line section which are connected on the cross section, and the circular arc section is a leading edge of the airfoil structure;
a second straight line section is correspondingly formed on the section of the mounting surface, and one end of the second straight line section is connected with the end part, far away from the first straight line section, of the circular arc section to form a front edge point; the other end of the second straight line section is connected with the end part, far away from the circular arc section, of the first straight line section to form a rear edge point.
In the above technical solution, further, the width of the flow guiding and noise reducing device is equal to the width of the enclosing plate.
In the above technical solution, further, the width of the flow-guiding noise reduction device is the length of the chord of the first airfoil structure, and the length of the chord of the first airfoil structure is 180mm;
the leading edge diameter of the first airfoil structure is between 326mm and 360 mm.
In the above technical solution, further, the flow guiding and noise reducing device is formed with an airflow channel extending along an arc-shaped path, and a curvature of the extending path of the airflow channel is identical to a curvature of the profile of the volute.
In the above technical solution, further, the profile of the air flow channel on the cross section forms a second airfoil structure located within the profile of the first airfoil structure, and the second airfoil structure has the same shape as the first airfoil structure.
In the above solution, further, the chord of the second airfoil structure has a length between 150mm and 172 mm;
the second airfoil structure having a leading edge diameter between 320mm and 340 mm;
the wall thickness of the air flow channel is between 3mm and 10 mm.
In the above technical solution, further, the length of the flow guiding and noise reducing device is less than or equal to 45% of the length of the profile of the volute, and the flow guiding and noise reducing device avoids the fixed bracket on the volute.
The application also provides a range hood, which comprises the flow guide and noise reduction device.
Compared with the prior art, the beneficial effect of this application is:
the flow guide and noise reduction device provided by the application adopts an airfoil structure, so that the sufficient air inlet amount and the uniformity of a flow field of an air inlet of an air duct are ensured, and the air flow disorder at the position is reduced; and the fluctuation of the airflow entering the main air inlet is reduced, the forward pressure gradient of the airflow is increased, the air inlet resistance at the side of the auxiliary air inlet is reduced, the airflow is more concentrated, the flue gas flow of the main air inlet and the auxiliary air inlet is balanced, and the pneumatic noise of the range hood is reduced.
The application also provides a range hood, which comprises the flow guide and noise reduction device. Based on the above analysis, the range hood has the above beneficial effects, which are not described herein again.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings used in the detailed description or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a first mounting structure of a flow guiding and noise reducing device provided in the present application;
fig. 2 is a schematic view of a second mounting structure of the flow guiding and noise reducing device provided in the present application;
fig. 3 is a schematic view of a first structure of a flow guiding and noise reducing device provided in the present application;
fig. 4 is a schematic view of a second structure of the flow guiding and noise reducing device provided in the present application.
In the figure: 101-a smoke collection cavity; 102-an air duct; 103-a centrifugal fan; 104-a volute; 105-a flow guide surface; 106-coaming; 107-a main air inlet; 108-secondary air inlet; 109-mounting face; 110-arc segment; 111-a first straight line segment; 112-a second straight line segment; 113-a gas flow channel; 114-flow guiding and noise reducing device.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and operate, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
Example one
Referring to fig. 1 to 4, the flow guiding and noise reducing device 114 provided in the present application is used in a range hood, and the range hood includes a smoke collecting cavity 101 and a duct 102, the smoke collecting cavity 101 is located below and opposite to a kitchen range, and a smoke airflow generated by cooking can enter the smoke collecting cavity 101 from a smoke inlet to collect smoke. The air duct 102 is located above the smoke collection cavity 101, and a centrifugal fan 103 is installed in the air duct 102 and can suck away smoke in the smoke collection cavity 101.
The flow guiding and noise reducing device 114 of the present application is installed at the bottom of the volute 104 of the centrifugal fan 103 of the range hood, that is, the flow guiding and noise reducing device 114 is located below the air duct 102, and one side of the flow guiding and noise reducing device 114 facing the smoke collection cavity 101 forms a flow guiding surface 105 to flow and guide the incoming smoke flow from the smoke collection cavity 101. Because the outer side surface of the enclosing plate 106 of the volute 104 is a curved surface, and the arrangement of the flow guide surface 105 needs to consider the curved surface structure of the volute 104, the flow guide surface 105 is also arranged to be arc-shaped, the curvature is consistent with the curvature of the molded line of the volute 104, and the extension trend of the flow guide surface 105 conforms to the extension trend of the enclosing plate 106 of the volute, so that the flow guide surface 105 can guide the incoming flow of the flue gas passing through each position of the bottom of the volute 104.
In the operation process of the range hood, negative pressure is formed on both sides of the centrifugal fan 103, and when smoke inflow enters the air duct 102 from the lower part of the air duct 102, the smoke inflow can be divided towards both sides of the air duct 102 under the action of the negative pressure. The primary air inlet 107 (corresponding to the motor side) and the secondary air inlet 108 (corresponding to the opposite side of the motor side) have different negative pressures, which may cause uneven distribution of flue gas flow. The key to the problem is to direct more flue gas flow towards the main inlet 107.
According to the superiority characteristics of airfoil flow guiding, the cross section of the flow guiding and noise reducing device 114 is set to be an airfoil shape based on the aerodynamic theory and the Bernoulli equation, and the impact and interference of incoming flow can be reduced through the structural characteristics, and the wall surface airflow fluctuation is reduced.
The location of the cross-section of the airflow directing noise reducer 114 also takes into account the curvature of the shroud 106. Specifically, a first airfoil structure is formed by cutting a cross section of the flow guiding and noise reducing device 114 along a preset plane, the preset plane is a plane in which a radius direction of the volute 104 and a width direction of a surrounding plate 106 of the volute 104 are located, the preset plane is infinite, and the cross section cut by each preset plane is an airfoil. Wherein the leading edge of the first airfoil structure faces the motor side of the centrifugal fan 103 and the trailing edge of the first airfoil structure faces the opposite side of the motor side; that is, the flow guiding and noise reducing device 114 is located at the end of the air duct 102 on the motor side rather than the convex side (the front edge side), so that more flue gas flows toward the main air inlet 107.
The flow-guiding and noise-reducing device 114 provided by the application adopts a wing-shaped structure, so that sufficient air inlet volume and uniformity of a flow field at an air inlet of the air duct 102 are ensured, and airflow turbulence at the air inlet is reduced; and the fluctuation of the airflow entering the main air inlet 107 is reduced, the forward pressure gradient is increased, the air inlet resistance at the side of the auxiliary air inlet 108 is reduced, the airflow is more concentrated, the flue gas flow of the main air inlet 107 and the auxiliary air inlet 108 is balanced, and the aerodynamic noise of the range hood is reduced.
In an optional scheme of this embodiment, a mounting surface 109 is formed on a side of the flow guiding and noise reducing device 114 facing away from the flow guiding surface 105, the mounting surface 109 is a curved surface and is attached to the outer peripheral surface of the shroud 106, and the curvature radius of the mounting surface 109 and the flow guiding surface 105 is referred to the profile of the volute 104.
Optionally, the flow-guiding noise-reducing device 114 is fixed under the volute 104 by spot welding, so as to ensure the stability of the structure installation. The flow guiding and noise reducing device 114 is attached to the bottom of the volute 104, and the installation position of the flow guiding and noise reducing device 114 needs to be free from a fixed bracket on the volute 104, and the fixed bracket is used for connecting the volute 104 and a chassis of the range hood.
Specifically, the length of the flow-guiding and noise-reducing device 114 is less than or equal to 45% of the length of the molded line of the volute 104, the flow-guiding and noise-reducing device 114 in the length range can cover a sufficient range of the incoming flow of the flue gas to play a role in flow distribution and flow guiding, and the size of the device is not too large to occupy too much internal space of the range hood.
This embodiment is optional in order to keep the maximum pressure at the forward stagnation position and to keep the aft stagnation low pressure (as close to 0 as possible). The flow guide surface 105 is arranged to form a circular arc section 110 and a first straight line section 111 which are connected on the cross section, the circular arc section 110 is connected with the straight line section to form an upper arc line of the first airfoil structure, and the circular arc section 110 is the front edge of the airfoil structure. The mounting surface 109 correspondingly forms a second straight line segment 112 on the cross section, and the second straight line segment 112 is a downward arc of the first airfoil structure; one end of the second straight line segment 112 is connected with the end of the circular arc segment 110 far away from the first straight line segment 111 to form a leading edge point; the other end of the second straight line segment 112 is connected to the end of the first straight line segment 111 away from the circular arc segment 110 to form a trailing edge point.
In an alternative of this embodiment, the width of the flow guiding noise reducer 114 is equal to the width of the shroud 106, that is, the length of the second straight line segment 112 in fig. 3 is the width of the shroud 106. As shown in fig. 1, on the left side (motor side) of the volute 104, the flow guiding surface 105 and the mounting surface 109 form a left connecting edge, and the left connecting edge is flush with the left side of the shroud 106; on the right side (opposite to the motor side) of the volute 104, the flow guiding surface 105 forms a right connecting edge with the mounting surface 109, and the right connecting edge is flush with the right side of the shroud 106. The flow guiding and noise reducing device 114 can cover the bottom of the volute 104 to prevent the structure of the volute 104 from influencing the flow direction of the air flow.
The width of the flow guiding and noise reducing device 114 (i.e. the width of the shroud 106) is the length of the chord of the first airfoil structure, which is shown in fig. 3, in particular the length a of the chord of the first airfoil structure is 180mm. The leading edge diameter B of the first airfoil structure is between 326mm and 360 mm. The leading edge of the first airfoil structure is enlarged on the side closer to the motor to ensure better movement of the airflow toward the primary air inlet 107.
Example two
The flow guiding and noise reducing device in the second embodiment is an improvement on the basis of the above embodiment, and the technical contents disclosed in the above embodiment are not described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in the second embodiment.
Referring to fig. 3 and 4, in an alternative embodiment of the present invention, the flow guiding and noise reducing device 114 is formed with an air flow passage 113 extending along an arc-shaped path, and the curvature of the extending path of the air flow passage 113 is consistent with the curvature of the contour of the volute 104.
Further, the profile of the air flow passage 113 in cross-section forms a second airfoil structure located within the profile of the first airfoil structure, and the second airfoil structure is the same shape as the first airfoil structure.
In this embodiment, the flow guiding and noise reducing device 114 is configured as a hollow structure, on one hand, the hollow design can reduce the weight of the flow guiding and noise reducing device 114, and on the other hand, since the flow guiding and noise reducing device 114 has a certain thickness, in order to avoid the flow guiding and noise reducing device 114 affecting the airflow in the outer circumferential direction of the scroll 104, the airflow channel 113 is configured, so that the airflow can circulate along the airflow channel 113. The cross section of the airflow channel 113 is also provided with an airfoil shape, and by utilizing the superior characteristics of airfoil shape flow guiding, the airflow characteristics can be improved, the uniformity of a flow field is optimized, and the airflow fluctuation noise is reduced.
As shown in FIG. 3, in particular, the length C of the chord of the second airfoil structure is between 150mm and 172 mm; the diameter D of the leading edge of the second airfoil structure is between 320mm and 340 mm; the wall thickness of the enclosed airflow channel 113 is between 3mm and 10 mm.
EXAMPLE III
The third embodiment of the application provides a range hood, which comprises the flow guide and noise reduction device of any one of the embodiments, so that all the beneficial technical effects of the flow guide and noise reduction device of any one of the embodiments are achieved, and the description is omitted.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application. Moreover, those of skill in the art will understand that although some embodiments herein include some features included in other embodiments, not others, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments.
Claims (10)
1. A flow guiding and noise reducing device is used for a range hood and is characterized in that a flow guiding surface is formed on one side of the flow guiding and noise reducing device so as to divide and guide the incoming flow of smoke from a smoke collecting cavity of the range hood; the other side of the flow guide and noise reduction device is arranged at the bottom of a volute of a centrifugal fan of the range hood, and the curvature of the flow guide surface is consistent with that of the molded line of the volute;
cutting the section of the flow guide and noise reduction device along a preset plane to form a first airfoil-shaped structure, wherein the preset plane is a plane in which the radius direction of the volute and the width direction of a coaming of the volute are located;
the leading edge of the first airfoil structure faces a motor side of the centrifugal fan and the trailing edge of the first airfoil structure faces an opposite side of the motor side.
2. The flow guiding and noise reducing device of claim 1, wherein an installation surface is formed on one side of the flow guiding and noise reducing device, which is far away from the flow guiding surface, and the installation surface is a curved surface and is attached to the peripheral surface of the enclosing plate.
3. The flow-guiding and noise-reducing device of claim 2, wherein the flow-guiding surface correspondingly forms a connected arc section and a first straight line section on the cross section, and the arc section is a leading edge of the airfoil structure;
a second straight line section is correspondingly formed on the section of the mounting surface, and one end of the second straight line section is connected with the end, far away from the first straight line section, of the circular arc section to form a front edge point; the other end of the second straight line section is connected with the end part, far away from the circular arc section, of the first straight line section to form a rear edge point.
4. The flow directing and noise reducing apparatus of claim 1, wherein the width of the flow directing and noise reducing apparatus is the same as the width of the shroud.
5. Flow guiding and noise reducing device according to claim 4, wherein the width of the flow guiding and noise reducing device is the length of the chord of the first airfoil structure and the length of the chord of the first airfoil structure is 180mm;
the leading edge diameter of the first airfoil structure is between 326mm and 360 mm.
6. The flow-guiding and noise-reducing device according to claim 1, wherein the flow-guiding and noise-reducing device is formed with an airflow passage extending along an arc-shaped path, and the curvature of the extending path of the airflow passage is identical to the curvature of the profile of the volute.
7. The flow guiding and noise reducing device of claim 6, wherein the contour of the airflow passage in the cross-section forms a second airfoil structure that is located within the contour of the first airfoil structure, and the second airfoil structure is the same shape as the first airfoil structure.
8. Flow guiding and noise reducing device according to claim 7, wherein the chord of the second airfoil structure has a length between 150mm and 172 mm;
the second airfoil structure having a leading edge diameter between 320mm and 340 mm;
the wall thickness of the air flow channel is between 3mm and 10 mm.
9. The flow guiding and noise reducing device of claim 1, wherein the length of the flow guiding and noise reducing device is less than or equal to 45% of the length of the molded line of the volute, and the flow guiding and noise reducing device is arranged to avoid a fixed support on the volute.
10. A range hood, comprising the flow-guiding and noise-reducing device as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222855612.1U CN218177573U (en) | 2022-10-27 | 2022-10-27 | Flow guiding and noise reducing device and range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222855612.1U CN218177573U (en) | 2022-10-27 | 2022-10-27 | Flow guiding and noise reducing device and range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218177573U true CN218177573U (en) | 2022-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222855612.1U Active CN218177573U (en) | 2022-10-27 | 2022-10-27 | Flow guiding and noise reducing device and range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218177573U (en) |
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2022
- 2022-10-27 CN CN202222855612.1U patent/CN218177573U/en active Active
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