Centrifugal fan and electrical equipment

Abstract

The invention relates to the technical field of electrical equipment, in particular to a centrifugal fan and the electrical equipment, and aims to solve the problem that in the prior art, a centrifugal fan is prone to air return. In order to achieve the purpose, the centrifugal fan comprises a fan body and an impeller, the fan body comprises a volute, a first disc and a second disc, the first disc and the second disc are located on the two sides of the volute, a first air inlet is formed in the first disc, an exhaust port is formed in the circumferential direction of the volute, and the impeller is rotationally installed in the volute; the first end of the impeller extends in the direction close to the first disc, so that the axial distance between the first end of the impeller and the first disc is reduced, the amount of gas flowing back to the first air inlet from the exhaust port is reduced, returned air at the air inlets is reduced, and the air inlet efficiency is improved. The stability of airflow at the air inlet is improved, and the problem of abnormal noise caused by air return of the centrifugal fan is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and specifically provides a centrifugal fan and electrical equipment. Background Art

[0002] Take the range hood as an example. It is equipped with a centrifugal fan, which includes a volute, an impeller and a motor. The impeller is rotatably installed in the volute and driven by the drive motor to rotate relative to the volute. The volute is provided with a first air inlet in the axial direction of the impeller and an exhaust port in the circumferential direction. When the impeller rotates, the pressure at the center of the impeller decreases, so the fumes can be sucked into the fan, which is then collected by the volute after being accelerated by the fan and guided to be discharged outdoors.

[0003] However, during the smoke exhaust process, some of the oil smoke in the volute that is not discharged from the exhaust port will flow to the air inlet, forming backflow at the air inlet, which not only affects the smoke exhaust effect, but also causes the airflow at the air inlet to be unstable and produce abnormal noise.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the centrifugal fan in the prior art is prone to backflow. The present application provides a centrifugal fan, the centrifugal fan comprising:

[0006] A fan body, the fan body comprising a volute and a first plate and a second plate located on both sides of the volute extending in a thickness direction thereof, the first plate being provided with a first air inlet, and the volute being provided with an exhaust port in a circumferential direction thereof;

[0007] An impeller is rotatably mounted in the volute and is configured to discharge the gas sucked from the first air inlet through the exhaust port when rotating, and a first end of the impeller extends toward a direction close to the first disk.

[0008] In a preferred technical solution of the above centrifugal fan, the centrifugal fan further includes a first air guide ring, and the first air guide ring is arranged at the outer peripheral contour of the first air inlet.

[0009] In the preferred technical solution of the above centrifugal fan, the first air guide ring includes a first connecting section connected to the first disk and a first air guide section arranged on the outer peripheral contour of the first connecting section.

[0010] In the preferred technical solution of the above centrifugal fan, the first connecting section is extended in a direction away from the second disk; and / or

[0011] The first air guiding section is an arc-shaped air guiding section.

[0012] In the preferred technical solution of the above centrifugal fan, a second air inlet is provided on the second disk.

[0013] In a preferred technical solution of the above centrifugal fan, the second end of the impeller extends in a direction close to the second disk.

[0014] In a preferred technical solution of the above centrifugal fan, the centrifugal fan further includes a second air guide ring, which is connected to the volute and arranged around the second air inlet.

[0015] In the preferred technical solution of the above centrifugal fan, the second air guide ring includes a second connecting section connected to the second disk and a second air guide section arranged on the outer peripheral contour of the second connecting section.

[0016] In the preferred technical solution of the above centrifugal fan, the second connecting section is extended in a direction away from the first disk; and / or

[0017] The second air guiding section is an arc-shaped air guiding section.

[0018] The present invention also provides an electrical device, which includes the centrifugal fan.

[0019] Those skilled in the art can understand that the centrifugal fan of the present invention includes a fan body and an impeller, the fan body includes a volute and a first plate and a second plate located on both sides of the volute, a first air inlet is arranged on the first plate, an exhaust port is arranged circumferentially of the volute, the impeller is rotatably installed in the volute, and is arranged so that the gas sucked in from the first air inlet can be discharged through the exhaust port during rotation, the first end of the impeller extends toward the direction close to the first plate, so that the axial distance between the first end of the impeller and the first plate is reduced, thereby reducing the amount of gas reflux from the exhaust port to the first air inlet, reducing the return air at the air inlet, improving the stability of the airflow at the air inlet, and reducing the problem of abnormal noise caused by return air in the centrifugal fan.

[0020] Furthermore, by providing an air guide ring at the first air inlet, on the one hand, the gas at the first air inlet can be guided into the volute to achieve flow diversion, and on the other hand, the return air at the first air inlet can be reduced.

[0021] Furthermore, by extending the first connecting section of the first air guide ring in a direction away from the second disk, the centrifugal fan can reduce the return wind at the air inlet without affecting the air intake volume; in addition, by extending the first end of the impeller through the first air inlet in the direction of the first air guide section, the return wind at the air inlet can be eliminated.

[0022] Furthermore, by arranging a second air inlet on the second plate, the gas can enter the fan body through the first air inlet and the second air inlet.

[0023] Furthermore, by extending the second end of the impeller toward the second disk, the axial distance between the second end of the impeller and the second disk is reduced, thereby reducing the amount of gas flowing back from the exhaust port to the second air inlet, reducing the return air at the second air inlet, improving the stability of the airflow at the second air inlet, and reducing the problem of abnormal noise caused by return air in the centrifugal fan.

[0024] Furthermore, by providing a second air guide ring at the second air inlet, on the one hand, the gas at the second air inlet can be guided into the volute to achieve flow guidance, and on the other hand, the return air at the second air inlet can be reduced.

[0025] Furthermore, by extending the second end of the impeller toward the second disk, the axial distance between the second end of the impeller and the second disk is reduced, thereby reducing the amount of gas flowing back from the exhaust port to the second air inlet, reducing the return air at the second air inlet, improving the stability of the airflow at the second air inlet, and reducing the problem of abnormal noise caused by return air in the centrifugal fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0027] Figure 1 is a cross-sectional view of a centrifugal fan in the prior art;

[0028] Figure 2 The structure of the centrifugal fan of the present invention is Figure 1 ;

[0029] Figure 3 The structure of the centrifugal fan of the present invention is Figure 2 ;

[0030] Figure 4 is a plan view of the centrifugal fan of the present invention;

[0031] Figure 5 yes Figure 4 Magnified image of AA.

[0032] List of reference numerals:

[0033] 1. Fan body; 11. Volute; 111. Exhaust port; 12. First plate; 121. First air inlet; 13. Second plate; 131. Second air inlet; 2. Impeller; 3. First air guide ring; 31. First connecting section; 32. First air guide section; 321. First part; 322. Second part; 4. Second air guide ring; 41. Second connecting section; 42. Second air guide section; 421. Third part; 422. Fourth part; 5. Third air guide ring; 6. Bracket; 61. Support rod; 62. Connector; 7. Drive motor. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. For example, although the present embodiment is introduced in conjunction with the application to a range hood, this is not intended to limit the scope of protection of the present application. Without departing from the principles of the present application, those skilled in the art may apply the present application to other types of electrical appliances. For example, an integrated stove, etc.

[0035] It should be noted that, in the description of the present application, terms such as "upper", "lower", "inner", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present application.

[0036] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "disposed" and "connected" 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, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] First refer to Figure 1 The centrifugal fan in the prior art is described. Figure 1 It is a cross-sectional view of a centrifugal fan in the prior art.

[0038] like Figure 1 As shown, the existing centrifugal fan includes a fan body 1 and an impeller 2 rotatably mounted in the fan body 1. The fan body 1 includes a volute 11 and two sides of the volute 11 in the thickness direction (such as Figure 1 The first disc 12 and the second disc 13 (left and right sides shown in the figure), the first disc 12 is provided with a first air inlet 121, the second disc 13 is provided with a second air inlet 131, the outer peripheral contours of the first disc 12 and the second disc 13 are respectively provided with a third air guide ring 5, and the volute 11 is provided with an air outlet 111 extending radially outward. The axial spacing between the first end of the impeller 2 and the first disc 12, and the second end and the second disc 13 is large, so that the first air inlet 121 and the second air inlet 131 are prone to backflow problems, and the airflow of the first air inlet 121 and the second air inlet 131 is also prone to instability, resulting in abnormal noise.

[0039] See next Figure 2-5 The centrifugal fan of this application is introduced. Figure 2 The structure of the centrifugal fan of the present invention is Figure 1, Figure 3 The structure of the centrifugal fan of the present invention is Figure 2 , Figure 4 is a plan view of the centrifugal fan of the present invention, Figure 5 yes Figure 4 Magnified image of AA.

[0040] like Figure 2 and Figure 3 As shown, in order to solve the problem of backflow easily occurring in centrifugal fans in the prior art, the centrifugal fan of the present application includes a fan body 1 and an impeller 2; the fan body 1 includes a volute 11 and a first plate 12 and a second plate 13 located on both sides of the volute 11 extending along its thickness direction, a first air inlet 121 is provided on the first plate 12, and an exhaust port is provided in the circumference of the volute 11; the impeller 2, the impeller 2 is rotatably installed in the volute 11, and is configured to be able to discharge the gas sucked in from the first air inlet 121 through the exhaust port when rotating, and the first end of the impeller 2 extends in a direction close to the first plate 12.

[0041] In the present application, the first end of the impeller 2 extends toward the direction close to the first disk 12, so that the axial distance between the first end of the impeller 2 and the first disk 12 is reduced, thereby reducing the amount of gas flowing back from the exhaust port to the first air inlet 121, thereby reducing the return air at the air inlet, improving the stability of the airflow at the air inlet, and solving the problem of abnormal noise caused by return air in the centrifugal fan.

[0042] See below for further reference Figure 2-5 , a preferred implementation of the centrifugal fan of the present application is introduced. Those skilled in the art will understand that the implementation described below is only used to illustrate the principle of the present application and is not intended to limit the scope of protection of the present application. On the premise that the centrifugal fan at least includes a fan body 1 and an impeller 2, those skilled in the art can adjust the following settings so that the present application can be applied to more specific application scenarios.

[0043] Reference Figure 2 and Figure 3 The fan body 1 includes a volute 11 and a first plate 12 and a second plate 13 located on both sides of the volute 11 extending along the thickness direction thereof. The first plate 12 and the second plate 13 are both circular. A first air inlet 121 is provided on the first plate 12, and a second air inlet 131 is provided on the second plate 13. Both the first air inlet 121 and the second air inlet 131 are circular air inlets. An exhaust port extending radially outward is provided on the volute 11, and the exhaust port is square, so that the air sucked in from the first air inlet 121 and the second air inlet 131 can be discharged through the exhaust port.

[0044] Of course, the present application has no restrictions on the shapes of the first plate 12, the second plate 13, the first air inlet 121, and the second air inlet 131, and those skilled in the art can adjust them according to specific application scenarios. For example, the first plate 12, the second plate 13, the first air inlet 121, and the second air inlet 131 can also be square, oval, etc., or the first plate 12, the second plate 13, the first air inlet 121, and the second air inlet 131 can also be independently circular, square, oval, etc. In addition, the present application is not fixed in the number of the first air inlet 121, the second air inlet 131, and the exhaust port 111, and those skilled in the art can adjust them according to specific application scenarios. For example, the number of the first air inlet 121, the second air inlet 131, and the exhaust port 111 can also be independently 1, 2, 3, or other numbers, as long as the gas can be inhaled from the first air inlet 121 and the second air inlet 131 and discharged through the exhaust port. In addition, in other embodiments, the first air inlet 121 and the second air inlet 131 do not need to be set at the same time. The first air inlet 121 can be opened only on the first plate 12 or the second air inlet 131 can be opened only on the second plate 13. Those skilled in the art can make a choice according to the specific situation.

[0045] It should be noted that the configuration of the exhaust port in the present application is not fixed, and those skilled in the art can adjust it according to the specific application scenario. For example, the exhaust port can also be directly opened in the circumference of the volute 11 without extending radially outward. In addition, the shape of the exhaust port in the present application is not unique, and can also be circular, elliptical, etc.

[0046] Next refer to Figure 2-5 The impeller 2 is installed in the volute 11 and is driven by the drive motor 7, so that when the impeller 2 rotates, the gas sucked from the first air inlet 121 can be discharged through the exhaust port. The axial length of the impeller 2 is equal to the distance between the first disk 12 and the second disk 13, so that the axial spacing from the first end of the impeller 2 to the first disk 12 and the axial spacing from the second end of the impeller 2 to the second disk 13 are both 0, thereby preventing the gas from flowing back to the first air inlet 121 and the second air inlet 131 from the gap between the impeller 2 and the first disk 12 and between the impeller 2 and the second disk 13, thereby solving the problem of return air at the air inlet.

[0047] Of course, the first end of the impeller 2 can also extend in the direction close to the first disk 12, and the second end of the impeller 2 can extend in the direction close to the second disk 13, so that the axial spacing between the first end of the impeller 2 and the first disk 12, and between the second end and the second disk 13 are reduced. At this time, the axial spacing from the first end of the impeller 2 to the first disk 12 and the axial spacing from the second end of the impeller 2 to the second disk 13 can also be a number greater than 0. As long as the return air out of the air inlet can be reduced, the present application has no restriction on the axial spacing from the first end of the impeller 2 to the first disk 12 and the axial spacing from the second end of the impeller 2 to the second disk 13.

[0048] Then refer to Figure 3 The second air inlet 131 is equipped with a bracket 6, and the drive motor 7 is installed on the second air guide ring 4 through the bracket 6; the bracket 6 includes a support rod 61 and a connecting member 62, the support rod 61 includes four support rods 61, and the four support rods 61 are arranged circumferentially along the second air inlet 131. The cross-section of the support rod 61 is in a broken line shape, and its first end is connected to the second air guide ring 4, and the second end is connected to the connecting member 62. The cross-section of the connecting member 62 is in a circular ring shape, and is sleeved and connected to the fixed end of the drive motor 7, thereby connecting the drive motor 7 to the fan body 1, so that the drive motor 7 can drive the impeller 2 to rotate.

[0049] Of course, the number and shape of the support members in this application are not fixed, and the technical field can change the number of support rods 61 according to the specific situation. For example, the support rods 61 can be 1, 2, 3 or other numbers, and / or the cross-section of the support rod 61 can also be curved or straight. In addition, the shape of the connecting member 62 in this application is not fixed, and those skilled in the art can adjust it according to the specific situation. For example, the connecting member 62 can include a plurality of connecting rods, and the plurality of connecting rods are axially connected to the fixed end of the drive motor 7, and each support rod 61 is connected to a corresponding connecting plate, so that the drive motor 7 can be connected to the fan body 1. The support rods 61 can be evenly distributed along the circumference of the second air inlet 131, or unevenly distributed, as long as the drive motor 7 can be connected to the fan body 1.

[0050] It should be noted that the bracket 6 can also be connected to the second disk 13, the first disk 12 or the first air guide ring 3, or the bracket 6 is respectively arranged on the first disk 12 and the second disk 13, and the two brackets 6 are connected to the fixed end of the drive motor 7, or the bracket 6 is respectively arranged on the first disk 12 and the second air guide ring 4, and the two brackets 6 are connected to the fixed end of the drive motor 7, or the bracket 6 is respectively arranged on the first disk 12 and the second air guide ring 4, and the two brackets 6 are connected to the fixed end of the drive motor 7, or the bracket 6 is respectively arranged on the first air guide ring 3 and the second air guide ring 4, and the two brackets 6 are connected to the fixed end of the drive motor 7, as long as the drive motor 7 can be connected to the fan body 1.

[0051] In addition, the support rod 61 and the connecting piece 62 in the bracket 6 can be connected in a detachable manner or can be integrally formed. Of course, the support rod 61 and the air guide ring can also be connected in a detachable manner or in an integrally formed manner, as long as the drive motor 7 can be connected to the fan body 1.

[0052] Next refer to Figure 2-5 A first air guide ring 3 is provided at the outer peripheral contour of the first air inlet 121. The first air guide ring 3 includes a first connecting section 31 connected to the first disk 12 and a first air guide section 32 connected to the first connecting section 31. The first connecting section 31 is a columnar structure. The surface of the first air guide section 32 is a curved surface, and the first air guide section 32 extends along the first connecting section 31 toward the axial direction of the first air inlet 121, and includes two parts, namely a first part 321 and a second part 322. The first part 321 extends along the first connecting section 31 in a direction away from the first disk 12, and the second part 322 extends along the first part 321 in a direction close to the first disk 12, and the end of the second part 322 away from the first part 321 extends to the area surrounded by the first connecting section 31, and the outer diameter of the first air guide section 32 gradually decreases from the first connecting section 31 to the axial direction of the first air inlet 121. The first connecting section 31 is arranged on the outer peripheral contour of the first air inlet 121, and its axial length is equal to the axial extension length of the first end of the impeller 2 in the present application relative to the first end of the impeller 2 in the prior art. In this way, while the axial spacing between the first end of the impeller 2 and the first disk 12 is reduced, the gap between the first end of the impeller 2 and the first air guide ring 3 can be kept unchanged, thereby facilitating the gas at the first air inlet 121 to enter the volute 11, and at the same time, the return air at the first air inlet 121 can be reduced.

[0053] Of course, the shapes of the first connecting section 31 and the first air guiding section 32 are not fixed in this application, and those skilled in the art can adjust them according to specific circumstances. For example, the first connecting section 31 can also be in the shape of a corrugated cylinder, and / or the cross section of the first air guiding section 32 can also be in the shape of a broken line.

[0054] Among them, the following example is listed to explain that the axial spacing between the first end of the impeller 2 and the first disk 12 can be reduced while the gap between the first end of the impeller 2 and the first air guide ring 3 can be kept unchanged. For example, in the prior art, the axial spacing from the first end of the impeller 2 to the first disk 12 is 15 mm, and in the present application, the axial spacing from the first end of the impeller 2 to the first disk 12 is 0 cm. That is to say, the first end of the impeller 2 in the present application is axially extended by 15 mm relative to the first end of the impeller 2 in the prior art. At this time, on the basis of keeping the original shape and size of the volute 11 unchanged, a first connecting section 31 is provided in the air guide ring, and the axial length of the first connecting section 31 is 15 mm, so that the axial spacing between the first end of the impeller 2 and the first disk 12 can be reduced while the gap between the first end of the impeller 2 and the first air guide ring 3 can be kept unchanged.

[0055] Of course, the axial spacing from the first end of the impeller 2 to the second disk 13 and the axial length of the first connecting section 31 can be appropriately adjusted. For example, if the axial length of the first connecting section 31 is 15 mm, the axial spacing from the first end of the impeller 2 to the second disk 13 can be a value greater than 0 mm (such as any value from 0 mm to 5 mm, or other values ​​greater than 5 mm). Alternatively, the axial spacing between the first end of the impeller 2 and the first air guide ring 3 is 0 mm, and the axial length of the first connecting section 31 is slightly greater than 15 mm (such as any value from 15 mm to 20 mm, or other values), or slightly less than 15 mm (such as any value from 5 mm to 15 mm, or other values). Alternatively, the axial spacing from the first end of the impeller 2 to the second disk 13 may be a value greater than 0 mm (such as any value between 0 mm and 5 mm, or other values ​​greater than 5 mm), and the axial length of the first connecting section 31 may be slightly greater than 15 mm (such as any value between 15 mm and 20 mm, or other values), or slightly less than 15 mm (such as any value between 5 mm and 15 mm, or other values). It should be noted that the first end of the impeller 2 may also extend through the second air inlet 131 toward the second air guide section 42, as long as the return air at the first air inlet 121 is reduced while the air intake is maintained.

[0056] Of course, in the present application, the specific structure of the first part 321 in the first air guide section 32 is not fixed, and those skilled in the art can adjust it according to the specific application scenario. For example, the first part 321 can also extend along the first connecting section 31 toward the axis direction of the first connecting section 31. In addition, the setting of the first part 321 in the first air guide section 32 is not necessary, and those skilled in the art can select it according to their needs.

[0057] Then refer to Figure 2-5A second air guide ring 4 is provided at the outer periphery of the second air inlet 131. The second air guide ring 4 includes a second connecting section 41 connected to the second disk 13 and a second air guide section 42 provided at the outer periphery of the second connecting section 41. The second connecting section 41 is a columnar structure. The second air guide section 42 extends along the second connecting section 41 in the axial direction of the second air inlet 131. The second air guide section 42 includes two parts, namely a third part 421 and a fourth part 422. The third part 421 extends along the second connecting section 41 in the axial direction of the second connecting section 41. The fourth part 422 extends along the third part 421 in the direction close to the second disk 13, and the end of the second part 322 away from the first part 321 extends to the area surrounded by the second connecting section 41. The outer diameter of the fourth part 422 in the second air guide section 42 gradually decreases from the first connecting section 31 to the axial direction of the second connecting section 41. The second connecting section 41 is arranged on the outer peripheral contour of the second air inlet 131, and its axial length is equal to the axial extension length of the second end of the impeller 2 in the present application relative to the second end of the impeller 2 in the prior art, so that the axial spacing between the second end of the impeller 2 and the second disk 13 is reduced while the gap between the second end of the impeller 2 and the second air guide ring 4 remains unchanged, thereby facilitating the gas at the second air inlet to enter the volute 11, and at the same time reducing the return air at the second air inlet 131.

[0058] Of course, the shapes of the second connecting section 41 and the second air guide section 42 are not fixed in this application, and those skilled in the art can adjust them according to specific circumstances. For example, the second connecting section 41 can also be in the shape of a corrugated cylinder, and / or the cross section of the second air guide section 42 can also be in the shape of a broken line.

[0059] Among them, the following example is listed to explain that the axial spacing between the second end of the impeller 2 and the second disk 13 can be reduced while the gap between the second end of the impeller 2 and the second air guide ring 4 can be kept unchanged. For example, in the prior art, the axial spacing from the second end of the impeller 2 to the second disk 13 is 15 mm, and in the present application, the axial spacing from the second end of the impeller 2 to the first disk 12 is 0 cm. That is to say, the second end of the impeller 2 in the present application is axially extended by 15 mm relative to the second end of the impeller 2 in the prior art. At this time, on the basis of maintaining the original shape and size of the volute 11, a second connecting section 41 is provided in the air guide ring, and the axial length of the second connecting section 41 is 15 mm, so that the axial spacing between the second end of the impeller 2 and the second disk 13 can be reduced while the gap between the second end of the impeller 2 and the second air guide ring 4 can be kept unchanged. When the axial spacing from the first end of the impeller 2 to the first disk 12 is 0 cm, the axial spacing from the second end of the impeller 2 to the first disk 12 is 0 cm, and the axial length of the first connecting section 31 and the second connecting section 41 is 15 mm, the wind pressure of the centrifugal fan can be increased by 5-10%.

[0060] Of course, the axial spacing from the second end of the impeller 2 to the second disk 13 and the axial length of the second connecting section 41 can be appropriately adjusted. For example, if the axial length of the second connecting section 41 is 15 mm, the axial spacing from the second end of the impeller 2 to the second disk 13 can be a value greater than 0 mm (such as any two values ​​between 0 mm and 5 mm, or other values ​​greater than 5 mm). Alternatively, the axial spacing between the second end of the impeller 2 and the second air guide ring 4 is 0 mm, and the axial length of the second connecting section 41 is slightly greater than 15 mm (such as any two values ​​between 15 mm and 20 mm, or other values), or slightly less than 15 mm (such as any two values ​​between 5 mm and 15 mm, or other values). Alternatively, the axial spacing from the second end of the impeller 2 to the second disk 13 can be a value greater than 0mm (such as any two values ​​between 0mm and 5mm, or other values ​​greater than 5mm), and the axial length of the second connecting section 41 can be slightly greater than 15mm (such as any two values ​​between 15mm and 20mm, or other values), or slightly less than 15mm (such as any two values ​​between 5mm and 15mm, or other values). It should be noted that the second end of the impeller 2 can also extend through the second air inlet 131 toward the second air guide section 42, as long as the return air at the first air inlet 121 is reduced while the air intake is maintained.

[0061] Of course, in the present application, the specific structure of the third portion 421 in the second air guide section 42 is not fixed, and those skilled in the art can adjust it according to specific application scenarios. For example, the third portion 421 can also extend along the second connecting section 41 in a direction away from the second plate 13. In addition, the third portion 421 in the second air guide section 42 is not required, and those skilled in the art can select it according to their needs.

[0062] In addition, the present invention also provides an electrical device, which includes the centrifugal fan in any of the above embodiments.

[0063] Among them, the electrical equipment may be a range hood, an integrated stove, and the like.

[0064] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0065] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A centrifugal fan, characterized in that: The centrifugal fan comprises: A fan body, the fan body comprising a volute and a first plate and a second plate located on both sides of the volute extending in a thickness direction thereof, the first plate being provided with a first air inlet, and the volute being provided with an exhaust port in a circumferential direction thereof; An impeller is rotatably mounted in the fan body and is configured to discharge the gas sucked from the first air inlet through the exhaust port when rotating, and a first end of the impeller extends in a direction close to the first disk.

2. The centrifugal fan according to claim 1, characterized in that: The centrifugal fan further includes a first air guide ring, which is arranged at the outer periphery of the first air inlet.

3. The centrifugal fan according to claim 2, characterized in that: The first air guide ring includes a first connecting section connected to the first disk and a first air guide section arranged on the outer periphery of the first connecting section.

4. The centrifugal fan according to claim 3, characterized in that: The first connecting section extends in a direction away from the second disk; and / or The first end of the impeller passes through the first air inlet and extends toward the first air guiding section.

5. The centrifugal fan according to claim 1, characterized in that: The second plate is provided with a second air inlet.

6. The centrifugal fan according to claim 5, characterized in that: The second end of the impeller extends toward the second disk.

7. The centrifugal fan according to claim 6, characterized in that: The centrifugal fan further includes a second air guide ring, which is connected to the volute and arranged around the second air inlet.

8. The centrifugal fan according to claim 7, characterized in that: The second air guide ring includes a second connecting segment connected to the second disk and a second air guide segment arranged on the outer periphery of the second connecting segment.

9. The centrifugal fan according to claim 8, characterized in that: The second connecting section is extended in a direction away from the first disk; and / or The second end of the impeller passes through the second air inlet and extends toward the second air guiding section.

10. An electrical device, characterized in that: The electrical equipment includes the centrifugal fan according to any one of claims 1-9.

Images