Fan shell, centrifugal fan and household appliance
By setting a static pressure recovery pipe section and a guide structure at the volute air outlet, the problem of uneven air outlet of the centrifugal fan is solved, the uniform transition of the air flow is achieved, the air volume is increased, the noise is reduced, and the oil fume extraction capacity of household appliances is improved.
Patent Information
- Application Number
- CN202420141080.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-19
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-01-19
AI Technical Summary
The airflow at the outlet of existing centrifugal fans is uneven, resulting in increased turbulence and noise, which affects the performance of the fan.
A static pressure recovery pipe section and a guide structure are set at the volute air outlet. The guide structure is streamlined, guiding the airflow to flow into the static pressure recovery pipe section, reducing turbulence and achieving a uniform transition of the airflow.
It improves the air outlet uniformity of the centrifugal fan, increases the air volume, reduces the operating noise, and improves the oil fume extraction performance of household appliances.
Smart Images
Figure CN222479042U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electrical appliances, in particular to a fan casing, a centrifugal fan and a household appliance. Background Art
[0002] As people's quality of life improves, range hoods and integrated stoves that can extract cooking fumes are widely used in home life to purify the kitchen environment and improve the cooking experience.
[0003] The fan is the core component of the range hood and integrated stove, and its performance directly determines the oil fume extraction performance of the range hood and integrated stove. The fan conventionally used in the range hood and integrated stove is a centrifugal fan, which usually includes a volute, an impeller arranged inside the volute, and a motor for driving the impeller to rotate. An air inlet is arranged at one end of the volute, and an air outlet is arranged at one side. When the impeller rotates, the smoke enters the volute from the air inlet and flows out through the air outlet.
[0004] In existing centrifugal fans, since the air flow entering the volute is thrown out of the air outlet through the impeller, the air flow has the problem of uneven flow at the air outlet: the air pressure on the side of the air outlet far away from the air inlet is higher, while the air pressure on the side close to the air inlet is lower, which causes the air flow to be uneven and turbulent when flowing out of the air outlet, affecting the actual operating air volume of the centrifugal fan. At the same time, the presence of turbulence will also increase the noise of the centrifugal fan during operation and reduce the performance of the centrifugal fan. Utility Model Content
[0005] The first object of the utility model is to provide a fan casing, which can reduce or avoid turbulence in an air outlet passage of the fan casing and improve the air outlet uniformity of the fan casing at the air outlet.
[0006] The second object of the utility model is to provide a centrifugal fan, which can improve the uniformity of the air outlet of the centrifugal fan, increase the operating air volume of the centrifugal fan, and reduce the noise during the operation of the centrifugal fan.
[0007] The third object of the present utility model is to provide a household appliance, which can improve the oil fume extraction performance of the household appliance and reduce the noise generated by the household appliance during operation.
[0008] To achieve this purpose, the utility model adopts the following technical solutions:
[0009] A fan casing comprises a volute and a static pressure recovery pipe section, the volute having an air cavity for installing an impeller, one end of the volute being provided with a fan air inlet connected to the air cavity, the static pressure recovery pipe section being sealingly connected to the volute air outlet of the volute and extending along the air outlet direction of the volute air outlet, the static pressure recovery pipe section having a first side facing the volute, the first side being provided with a guide structure, the guide structure extending from the volute air outlet in a direction away from the volute air outlet, the guide structure having a guide curved surface arched toward the inside of the static pressure recovery pipe section and being streamlined, the guide curved surface being used to guide the airflow at the volute air outlet to flow toward the first side.
[0010] As an optional technical solution for the fan casing, the first side is recessed from the outside to the inside to form a concave portion, and the inner concave curved surface of the concave portion forms the guide curved surface.
[0011] As an optional technical solution for a fan casing, on a projection plane perpendicular to the axis of the fan air inlet, the two end points of the guide surface are point A and point B, respectively, point A is the intersection of the static pressure recovery pipe section and the volute, the highest arch position of the guide surface is point C, the lengths of point A and point C in the extension direction of the static pressure recovery pipe section are L1, and the lengths of point B and point C in the extension direction are L2, and L2≥3L1.
[0012] As an optional technical solution for a fan casing, on the projection plane, the distance between point C and the line connecting point A and point B is d, and the width of the volute air outlet is W, d≤0.3W.
[0013] As an optional technical solution for the fan casing, on the projection plane, the extension length of the static pressure recovery pipe section is L, and L1+L2≥0.5L.
[0014] As an optional technical solution of a fan casing, on a projection plane perpendicular to the axis of the fan air inlet, the width of the air outlet end of the static pressure recovery pipe section is D, and the extension length of the static pressure recovery pipe section is L, L ≥ 1.2D;
[0015] And / or, the cross-sectional area of the air outlet end of the static pressure recovery pipe section is S0, and the cross-sectional area of the static pressure recovery pipe section at any cross section is S, S=0.85S0~1.15S0.
[0016] As an optional technical solution for a fan casing, the fan casing further includes an air outlet circular pipe, and the air outlet circular pipe is connected to an end of the static pressure recovery pipe section away from the volute.
[0017] As an optional technical solution for a fan casing, the volute and the static pressure recovery pipe section are integrally formed; and / or the air outlet circular pipe and the static pressure recovery pipe section are integrally formed.
[0018] A centrifugal fan comprises the fan casing as described above.
[0019] A household appliance comprises the centrifugal fan as described above.
[0020] Beneficial effects of the utility model:
[0021] The fan casing provided by the utility model can achieve a smooth transition of the airflow from the volute outlet to the fan outlet of the fan casing by arranging a static pressure recovery pipe section, so that the uneven air outlet at the volute outlet can form a uniform air outlet at the fan outlet after being recovered by the static pressure recovery pipe section, thereby improving the air characteristics of the centrifugal fan, reducing the kinetic energy loss of the centrifugal fan, and reducing the noise generated when the centrifugal fan is running; at the same time, by arranging a guide structure with a guide curved surface on the first side of the static pressure recovery pipe section, the airflow at the volute outlet away from the fan inlet can be guided to follow the static pressure recovery of the guide curved surface The first side of the complex pipe section makes the airflow at the air outlet of the static pressure recovery pipe section flow more uniformly; at the same time, since the airflow at the volute outlet is more concentrated on the side away from the fan outlet, if the guide structure is not set, due to the non-uniformity of the airflow, turbulence will occur in the area close to the volute outlet on the first side of the static pressure recovery pipe section. By setting the guide structure, the guide structure occupies the turbulent area of the static pressure recovery pipe section, thereby reducing or avoiding turbulence inside the static pressure recovery pipe section, improving the drainage effect, and further improving the flow characteristics in the fan casing, reducing the startup noise of the airflow passing through the fan casing.
[0022] The centrifugal fan provided by the utility model can improve the air characteristics of the centrifugal fan, increase the air volume of the centrifugal fan, and reduce the noise of the centrifugal fan by adopting the above-mentioned fan casing.
[0023] The household appliance provided by the utility model can improve the oil fume extraction capacity of the household appliance and reduce the noise generated when the household appliance is running by adopting the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a structural schematic diagram of the centrifugal fan provided by the first embodiment of the utility model at a certain viewing angle;
[0025] Figure 2 It is a structural schematic diagram of the centrifugal fan provided by the first embodiment of the utility model from another perspective;
[0026] Figure 3 It is a top view of the centrifugal fan provided in the first embodiment of the utility model;
[0027] Figure 4 This is a schematic diagram of the structure of the integrated stove provided in the second embodiment of the utility model in a partially cutaway state;
[0028] Figure 5 This is a partial structural sectional view of the integrated stove provided in Example 2 of the utility model.
[0029] The following are marked in the figure:
[0030] 10. centrifugal fan; 20. machine body; 201. smoke exhaust port; 202. air duct; 30. functional module; 40. hood head; 401. smoke inlet; 50. stove; 60. mounting bracket;
[0031] 1. Fan casing; 11. Volute; 111. Fan air inlet; 12. Static pressure recovery pipe section; 121. Guide curved surface; 13. Air outlet circular pipe;
[0032] 2. Impeller; 3. Motor; 4. Fixed base. DETAILED DESCRIPTION
[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0037] Embodiment 1
[0038] like Figures 1 to 3 As shown, this embodiment provides a centrifugal fan 10, which can be applied to household appliances capable of extracting oil fumes, such as range hoods and integrated stoves, so as to improve the oil fume extraction performance while improving the air performance of the centrifugal fan 10.
[0039] Specifically, the centrifugal fan 10 includes a fan casing 1, an impeller 2 and a motor 3. The fan casing 1 includes a volute 11, the volute 11 has a wind cavity, one end of the volute 11 is provided with a fan air inlet 111 connected to the wind cavity, and one side of the volute 11 is provided with a volute air outlet connected to the wind cavity; the impeller 2 is installed in the wind cavity, the motor 3 is installed in the fan casing 1 and the drive shaft of the motor 3 is connected to the impeller 2 to drive the impeller 2 to rotate around its axis.
[0040] In this embodiment, the fan casing 1 also includes a static pressure recovery pipe section 12, which is sealed and connected to the volute air outlet of the volute 11 and extends along the air outlet direction of the volute air outlet. The static pressure recovery pipe section 12 has a first side facing the volute 11, and a guide structure is provided on the first side. The guide structure extends from the volute air outlet in a direction away from the volute air outlet. The guide structure has a streamlined guide surface 121 that is arched toward the inside of the static pressure recovery pipe section 12, and the guide surface 121 is used to guide the airflow at the volute air outlet to flow toward the first side.
[0041] The fan casing 1 and the centrifugal fan 10 provided in the present embodiment can realize a smooth transition of the airflow from the volute air outlet to the fan air outlet of the fan casing 1 by providing a static pressure recovery pipe section 12, so that the uneven air outlet at the volute air outlet can form a uniform air outlet at the fan air outlet after being recovered by the static pressure recovery pipe section 12, thereby improving the air characteristics of the centrifugal fan 10, reducing the kinetic energy loss of the centrifugal fan 10, and reducing the noise generated during the operation of the centrifugal fan 10; at the same time, by providing a guide structure with a guide curved surface 121 on the first side of the static pressure recovery pipe section 12, the airflow on the side of the volute air outlet away from the fan air inlet 111 can be guided along the guide curved surface 1 21 The first side of the static pressure recovery pipe segment 12 makes the airflow at the air outlet of the static pressure recovery pipe segment 12 more uniform; at the same time, since the airflow at the volute air outlet is more concentrated on the side away from the fan outlet, if the guide structure is not set, due to the non-uniformity of the airflow, turbulence will be generated in the area close to the volute air outlet on the first side of the static pressure recovery pipe segment 12. By setting the guide structure, the guide structure occupies the turbulent area of the static pressure recovery pipe segment 12, thereby reducing or avoiding turbulence inside the static pressure recovery pipe segment 12, improving the drainage effect, and further improving the flow characteristics, increasing the air volume of the centrifugal fan 10, and reducing the noise of the centrifugal fan 10.
[0042] In this embodiment, the first side of the static pressure recovery pipe segment 12 is recessed from the outside to the inside to form a concave portion, the concave portion forms the above-mentioned flow guide structure, and the inner concave curved surface of the concave portion forms a flow guide curved surface 121, thereby simplifying the processing of the static pressure recovery pipe segment 12 and reducing the processing difficulty and processing cost of the static pressure recovery pipe segment 12. In other embodiments, while the shape of the static pressure recovery pipe segment 12 maintains a smooth transition, a flow guide structure can be set inside the static pressure recovery pipe segment 12, and the flow guide structure can be welded, bonded, or detachably installed in the static pressure recovery pipe segment 12.
[0043] On a projection plane perpendicular to the rotating axis of the impeller 2 and on a projection plane perpendicular to the axis of the fan air inlet 111, the two end points of the guide surface 121 are point A and point B respectively, point A is the intersection of the static pressure recovery pipe section 12 and the volute 11, the highest arch position of the guide surface 121 is point C, the arch height of the guide surface 121 gradually increases from point A to point C, and the arch height of the guide surface 121 gradually decreases from point C to point B.
[0044] The length of point A and point C in the extension direction of the static pressure recovery pipe section 12 is L1, and the length of point B and point C in the extension direction is L2, and L2≥3L1. This arrangement allows point C to be arranged close to the volute air outlet, that is, point C is closer to the area where turbulence is easily generated, thereby better improving the turbulence inside the static pressure recovery pipe section 12. At the same time, since point C is closer to the airflow concentration area of the volute air outlet, it is more conducive to guiding the airflow of the volute air outlet to flow to the first side.
[0045] On the projection plane, the distance between point C and the line connecting point A and point B is d, the width of the volute air outlet is W, and d≤0.3W. At the same time, limiting the d value can effectively prevent the guide curved surface 121 from being raised too high and causing excessive occupation of the effective airflow channel in the static pressure recovery pipe section 12, reduce the airflow flow resistance, and ensure the smoothness of the airflow flowing through the static pressure recovery pipe section 12.
[0046] Furthermore, on the projection plane, the extension length of the static pressure recovery pipe section 12 is L, and L1+L2≥0.5L, thereby increasing the effective area of the static pressure recovery pipe section 12 and increasing the drainage effect.
[0047] In this embodiment, the fan housing 1 further includes an air outlet circular pipe 13, which is connected to an end of the static pressure recovery pipe section 12 away from the volute 11. The provision of the air outlet circular pipe 13 facilitates the connection between the centrifugal fan 10 and the external structure, and improves the installation convenience of the centrifugal fan 10.
[0048] The diameter of the air outlet circular pipe 13 is D, and the extension length of the static pressure recovery pipe section 12 is L, where L≥1.2D, to ensure that the static pressure recovery pipe section 12 has sufficient static pressure recovery length and to ensure the uniformity of the airflow at the air outlet circular pipe 13. Furthermore, L≤2D.
[0049] The cross-section of the air outlet circular duct 13 is S0, and the cross-section of the static pressure recovery pipe section 12 is S, S=0.85S0~1.15S0, which can effectively avoid the sudden change of the cross-section of the static pressure recovery pipe section 12 between the volute air outlet and the air outlet circular duct 13, and realize the smooth transition of the cross-section of the static pressure recovery pipe section 12.
[0050] It is worth noting that the cross-sectional shape of the outlet end of the static pressure recovery pipe section 12 is the same as the cross-sectional shape of the outlet circular pipe 13, so as to facilitate the connection between the static pressure recovery pipe section 12 and the outlet circular pipe 13 and ensure the smoothness of the airflow at the connection between the static pressure recovery pipe section 12 and the outlet circular pipe 13. That is, on the projection plane perpendicular to the axis of the fan air inlet 111, the outlet end of the static pressure recovery pipe section 12 is equal to the diameter of the outlet circular pipe 13, and the cross-sectional area of the outlet end of the static pressure recovery pipe section 12 is the same as the cross-sectional area of the outlet circular pipe 13.
[0051] The volute 11 and the static pressure recovery pipe section 12 are integrally formed; and / or the air outlet circular duct 13 and the static pressure recovery pipe section 12 are integrally formed. By arranging the volute 11 and the static pressure recovery pipe section 12 to be welded or integrally formed, the air tightness of the connection between the volute 11 and the static pressure recovery pipe section 12 can be improved, the probability of smoke leakage can be reduced, and the problem of increasing the size of the fan casing 1 caused by setting other connecting structures to connect the two can be avoided; at the same time, by arranging the air outlet circular duct 13 and the static pressure recovery pipe section 12 to be integrally formed or welded, the air flow can be prevented from leaking through the connection between the two, and the problem of increasing the size of the fan casing 1 caused by setting other connecting structures to connect the two can be avoided.
[0052] In this embodiment, the volute 11 , the static pressure recovery pipe section 12 and the air outlet circular pipe 13 are all integrally formed to reduce the probability of airflow leakage, simplify the processing and assembly process of the fan casing 1 , and improve the structural integrity of the fan casing 1 .
[0053] Further, in this embodiment, a fixing seat 4 is provided on the end surface of the volute 11, and the fixing seat 4 is used to realize the installation of the centrifugal fan 10 on the household appliance. In this embodiment, the fixing seat 4 is provided on the air inlet end surface of the volute 11, and in other embodiments, the fixing seat 4 can also be provided on the back end surface of the volute 11.
[0054] Embodiment 2
[0055] like Figure 4 and Figure 5 As shown, this embodiment provides a household appliance, including the centrifugal fan 10 provided in Embodiment 1. In the household appliance provided in this embodiment, the centrifugal fan 10 adopts the structure in Embodiment 1. By adopting the above centrifugal fan 10, the oil fume extraction effect of the household appliance can be improved and the noise during the operation of the household appliance can be reduced.
[0056] In this embodiment, the household appliance is an integrated stove, which includes a body 20, a stove 50, a hood module and a functional module 30. The stove 50 is installed on the top of the body 20 and is used to cook food; the hood module includes a hood head 40 and a centrifugal fan 10, the hood head 40 is installed on the top of the body 20 and located at the rear side of the stove 50, and the hood head 40 has a smoke inlet 401 and a smoke collecting cavity connected to the smoke inlet 401; the body 20 is provided with an air duct 202, and an outer wall of the body 20 is provided with a smoke exhaust port 201 connected to the air duct 202; the centrifugal fan 10 is installed in the air duct 202, and the fan air inlet 111 is connected to the air duct 202, and the outlet end of the centrifugal fan 10 is sealed and connected to the smoke exhaust port 201.
[0057] Furthermore, the air outlet circular pipe 13 of the centrifugal fan 10 is sealed from the inside to the outside and passes through the smoke exhaust port 201 to improve the convenience of installing the centrifugal fan 10 inside the integrated stove and improve the assembly efficiency of the centrifugal fan 10.
[0058] A mounting bracket 60 is disposed inside the air duct 202 , and the mounting bracket 60 is detachably connected to the fixing seat 4 to improve the convenience of disassembly and assembly of the centrifugal fan 10 .
[0059] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. A fan casing, characterized in that: The invention comprises a volute (11) and a static pressure recovery pipe section (12), wherein the volute (11) has an air cavity for installing an impeller (2), one end of the volute (11) is provided with a fan air inlet (111) connected to the air cavity, the static pressure recovery pipe section (12) is sealedly connected to the volute air outlet of the volute (11) and extends along the air outlet direction of the volute air outlet, the static pressure recovery pipe section (12) has a first side facing the volute (11), the first side is provided with a guide structure, the guide structure extends from the volute air outlet in a direction away from the volute air outlet, the guide structure has a streamlined guide curved surface (121) arched toward the inside of the static pressure recovery pipe section (12), and the guide curved surface (121) is used to guide the airflow of the volute air outlet to flow toward the first side.
2. The fan housing according to claim 1, characterized in that: The first side is recessed from the outside to the inside to form a concave portion, and the inner concave curved surface of the concave portion forms the guide curved surface (121).
3. The fan housing according to claim 1, characterized in that: On a projection plane perpendicular to the axis of the fan air inlet (111), the two end points of the guide curved surface (121) are point A and point B, respectively; point A is the intersection of the static pressure recovery pipe section (12) and the volute (11); the highest arch position of the guide curved surface (121) is point C; the lengths of point A and point C in the extension direction of the static pressure recovery pipe section (12) are L1; the lengths of point B and point C in the extension direction are L2, and L2≥3L1.
4. The fan housing according to claim 3, characterized in that: On the projection plane, the distance between point C and the line connecting point A and point B is d, the width of the volute air outlet is W, and d≤0.3W.
5. The fan housing according to claim 3, characterized in that: On the projection plane, the extension length of the static pressure recovery pipe section (12) is L, and L1+L2≥0.5L.
6. The fan housing according to claim 1, characterized in that: On a projection plane perpendicular to the axis of the fan air inlet (111), the width of the air outlet end of the static pressure recovery pipe section (12) is D, and the extension length of the static pressure recovery pipe section (12) is L, where L≥1.2D; And / or, the cross-sectional area of the air outlet end of the static pressure recovery pipe section (12) is S0, and the cross-sectional area of the static pressure recovery pipe section (12) at any cross section is S, S=0.85S0~1.15S0.
7. The fan housing according to any one of claims 1 to 6, characterized in that: The fan casing further comprises an air outlet circular pipe (13), wherein the air outlet circular pipe (13) is connected to an end of the static pressure recovery pipe section (12) away from the volute (11).
8. The fan housing according to claim 7, characterized in that: The volute (11) and the static pressure recovery pipe section (12) are integrally formed; and / or the air outlet circular pipe (13) and the static pressure recovery pipe section (12) are integrally formed.
9. A centrifugal fan, characterized in that: Comprising a fan casing as described in any one of claims 1-8.
10. A household appliance, characterized in that: Comprising the centrifugal fan as claimed in claim 9.