Fan system for range hood and range hood

Abstract

The draught fan system comprises a volute, the volute is provided with a front cover plate, a rear cover plate and an annular wall, the front cover plate is provided with a front air inlet penetrating through the wall thickness, the rear cover plate and the front cover plate are oppositely arranged in a spaced mode, and the rear cover plate is provided with a rear air inlet penetrating through the wall thickness; the annular wall is arranged between the front cover plate and the rear cover plate; the impeller is arranged in the volute; a machine shell of the motor is arranged on the inner periphery of the impeller and is fixed relative to the volute, and the machine shell is provided with a front side face arranged towards the front air inlet and a rear side face arranged towards the rear air inlet; the front side face of the machine shell is a first curved surface which is arched forwards, the rear side face of the machine shell is a second curved surface which is arched backwards, and the periphery of the first curved surface is connected with the periphery of the second curved surface. Compared with the prior art, the wind resistance can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of kitchen appliances, and in particular relates to a fan system for a range hood and the range hood. Background Art

[0002] The fan system in the existing range hood is a structure disclosed in application number 202310497865.2 and application publication number CN116398469A, which includes a volute, an impeller arranged in the volute, a motor for driving the impeller to rotate, and a guide vane. The volute includes two cover plates arranged at intervals and an annular wall formed between the cover plates, and an air inlet is provided on the cover plate; the impeller includes a disk away from the air inlet side and at least two blades, and the blades are fixed to the disk away from the air inlet side; the guide vane is annular, surrounds the outlet of each blade and extends outward from the fixed point with the blade along the radial direction of the centrifugal fan, and the guide vane includes a guide section, and the guide section is deflected toward the disk away from the air inlet side.

[0003] Another example is the structure disclosed in the Chinese utility model patent "Centrifugal fan with noise reduction function and range hood using the same" with patent number 202220245787.8 and authorization announcement number CN217002424U, which includes a volute, an impeller arranged in the volute, a motor for driving the impeller to rotate, at least one noise reduction plate and a motion mechanism. The volute includes an annular wall and two side plates arranged opposite to and spaced apart in the front-to-back direction, and the annular wall is connected between the two side plates; the noise reduction plate is arranged in the volute and opposite to one of the two side plates, and a noise reduction cavity is defined between the noise reduction plate and at least a portion of the corresponding side plate, and noise reduction holes connected to the noise reduction cavity are distributed on the noise reduction plate; the motion mechanism is connected to the noise reduction plate, and is used to drive the noise reduction plate to move back and forth along the axial direction of the impeller, thereby changing the volume of the noise reduction cavity.

[0004] The existing range hood uses a motor to drive the impeller to rotate so that the oil smoke airflow enters the impeller along both ends of the impeller axis, and most of the oil smoke airflow is concentrated in the middle position of the impeller axis and then leaves the impeller and enters the volute ring wall under the action of centrifugal force. However, the outer shell of the current motor is mostly cylindrical, which has a certain barrier to the oil smoke airflow entering along the impeller axis and generates turbulence, affecting the performance of the whole machine. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide a fan system for a range hood in view of the current status of the prior art to reduce wind resistance.

[0006] The second technical problem to be solved by the utility model is to provide a range hood with the above-mentioned fan system.

[0007] The technical solution adopted by the utility model to solve the above-mentioned first technical problem is: a fan system for a range hood, comprising:

[0008] The volute comprises a front cover plate, a rear cover plate and an annular wall, wherein the front cover plate is provided with a front air inlet penetrating through the wall thickness, the rear cover plate is arranged relative to the front cover plate and spaced apart from the front cover plate, and is provided with a rear air inlet penetrating through the wall thickness, and the annular wall is arranged between the front cover plate and the rear cover plate;

[0009] An impeller is disposed in the volute;

[0010] A motor, whose housing is arranged at the inner periphery of the impeller and fixed relative to the volute, and the housing has a front side surface arranged toward the front air inlet and a rear side surface arranged toward the rear air inlet, and whose rotating shaft is connected to the impeller for driving the impeller to rotate;

[0011] Features:

[0012] The front side surface of the housing is a first curved surface arched forward, and the rear side surface of the housing is a second curved surface arched backward. The periphery of the first curved surface is connected with the periphery of the second curved surface.

[0013] The first curved surface and the second curved surface can reduce the flow resistance to the oil smoke airflow, reduce the generation of turbulence, have less impact on the oil smoke, and reduce the impact of the shape of the motor housing on the performance of the range hood.

[0014] In this embodiment, the structure and assembly method of other parts of the motor are the same as those in the prior art, and preferably, the features on the surface of the motor casing are reduced as much as possible to reduce the resistance to the oil smoke airflow.

[0015] Preferably, the first curved surface forms the pointed part of the casing, and the curvature of the first curved surface is b, and the second curved surface forms the blunt part of the casing, and the curvature of the second curved surface is a, and both satisfy: a / 10≤b≤a / 4.

[0016] That is, the casing is in the shape of a teardrop, and the blunt head portion ensures a smaller wetting area under the same volume to reduce the friction resistance between the oil smoke and the casing surface, and ensures a certain internal volume to assemble other internal parts such as the stator and rotor.

[0017] Preferably, the rotating shaft passes through the center of the first curved surface of the housing and extends forward.

[0018] In the above solutions, preferably, the periphery of the first curved surface is circular, and the first curved surface gradually arches forward from the periphery to the center;

[0019] The periphery of the second curved surface is circular, and the second curved surface gradually arches backward from the periphery to the center.

[0020] Furthermore, the periphery of the first curved surface is smoothly connected with the periphery of the second curved surface, and the connecting point is the part where the diameter of the casing is the largest.

[0021] Furthermore, the diameter of the connection is d1, and the diameter of the impeller is d2, and the two satisfy: 1 / 4≤d1 / d2≤1 / 2, thereby ensuring the internal space of the motor housing and not affecting the air intake of the impeller.

[0022] Preferably, the impeller comprises a first end ring and a second end ring arranged in a front-rear interval, and blades arranged between the first end ring and the second end ring, and the blades are at least three and are arranged in an interval along the circumference of each end ring;

[0023] The housing of the motor is located between the first end ring and the second end ring, and is relatively close to the second end ring and relatively far from the first end ring.

[0024] Preferably, the distance between the second end ring and the connection in the front-to-back direction is L1, and the depth of the impeller in the front-to-back direction is H, and both satisfy: 1 / 10≤L1 / H≤1 / 8. Ensure that the maximum diameter of the motor housing is far away from the impeller end ring air inlet channel.

[0025] Preferably, the radial distance L2 between the connection point and the second end ring is 5-10 mm, so as to ensure that the front and rear winds preferentially contact the impeller, and reduce the influence of the blunt head part on the impeller wind.

[0026] Preferably, it further comprises a middle plate, which is vertically arranged between the first end ring and the second end ring and on the front side of the casing, and the edge of the middle plate is connected to the impeller, and the central part of the middle plate is connected to the rotating shaft of the motor;

[0027] The distance L3 between the portion of the first curved surface with a diameter of d1 / 2 and the edge of the middle disk in the front-to-back direction is 5-10 mm. The influence of the turbulent flow at the tip end on the impeller is reduced as much as possible.

[0028] The technical solution adopted by the utility model to solve the second technical problem is: a range hood, characterized by having the fan system as described above.

[0029] Compared with the prior art, the advantages of the utility model are: the first curved surface and the second curved surface can reduce the flow resistance to the oil smoke airflow, reduce the generation of turbulence, have less impact on the oil smoke, and reduce the impact of the motor housing shape on the performance of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the fan system in the embodiment of the utility model;

[0031] Figure 2 It is a structural schematic diagram of the fan system in another perspective in the embodiment of the utility model;

[0032] Figure 3A cross-sectional view of a fan system in an embodiment of the utility model;

[0033] Figure 4 for Figure 3 Schematic diagram from another perspective;

[0034] Figure 5 It is a structural schematic diagram of a range hood in an embodiment of the utility model. DETAILED DESCRIPTION

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0036] like Figures 1 to 5 As shown, a fan system for a range hood and a preferred embodiment of the range hood of the utility model are shown. The fan system is a centrifugal fan including a volute 1, an impeller 2 and a motor 3.

[0037] Among them, the volute 1 is an existing volute structure, which has a front cover plate 11, a rear cover plate 12 and an annular wall 13. The front cover plate 11 is provided with a circular front air inlet 110 that penetrates the wall thickness. The rear cover plate 12 is arranged relatively spaced from the front cover plate 11 and is provided with a rear air inlet 120 at the center of the circle that penetrates the wall thickness. The annular wall 13 is arranged between the front cover plate 11 and the rear cover plate 12.

[0038] The impeller 2 is arranged in the volute 1, and has a first end ring 21 and a second end ring 22 arranged in a front-to-rear interval, and blades 20 arranged between the first end ring 21 and the second end ring 22, and there are at least three blades 20 arranged in intervals along the circumference of each end ring; the impeller 2 also has a middle plate 23, which is vertically arranged between the first end ring 21 and the second end ring 22, and the edge of the middle plate 23 is connected to the impeller 2. The diameter of the impeller 2 is d2.

[0039] The motor 3 includes a housing 30 and a rotating shaft 31. The housing 30 is arranged at the inner periphery of the impeller 2 (the housing 30 is located between the first end ring 21 and the second end ring 22, and is relatively close to the second end ring 22 and relatively far from the first end ring 21), and is located at the radial center of the impeller, fixed relative to the volute 1, and the housing 30 has a front side surface 301 arranged toward the front air inlet 110, and the front side surface 301 is a first curved surface that arches forward, the periphery of the first curved surface is circular, and the first curved surface gradually arches forward from the periphery to the center, and the first curved surface forms the tip of the housing 30. The housing 30 also has a rear side surface 302 disposed toward the rear air inlet 120, the rear side surface 302 is a second curved surface that arches backwards, the periphery of the second curved surface is circular and the second curved surface gradually arches backwards from the periphery to the center, the second curved surface forms the blunt head of the housing 30, and the curvature of the second curved surface is a, satisfying: a / 10≤b≤a / 4, the second curved surface can reduce the resistance to the oil smoke airflow entering from the rear air inlet 120. The periphery of the first curved surface is smoothly connected with the periphery of the second curved surface, the connection 303 is the largest diameter part of the housing 30, and the diameter of the connection 303 is d1, satisfying: 1 / 4≤d1 / d2≤1 / 2. Note that the distance between the connection 303 and the second end ring 22 in the front-to-back direction is L1, and the depth of the impeller 2 in the front-to-back direction is H, and both satisfy: 1 / 10≤L1 / H≤1 / 8. In this embodiment, the radial distance L2 between the connection 303 and the second end ring 22 is 5 to 10 mm (L2 can be any value between 5 and 10 mm, such as L2 is 5 mm, 6 mm, 8 mm, 10 mm, etc.). The distance L3 between the portion of the first curved surface with a diameter of d1 / 2 and the edge of the middle disk 23 in the front-to-back direction is 5 to 10 mm (L3 can be any value between 5 and 10 mm, such as L3 is 5 mm, 6 mm, 8 mm, 10 mm, etc.). For details, please refer to Figure 4 .

[0040] The rotating shaft 31 of the motor 3 extends forward through the center of the first curved surface of the housing 30 and is bound together with the middle plate 23 to drive the impeller 2 to rotate.

[0041] The range hood of this embodiment has a housing 4 with a smoke inlet 41 and a smoke outlet 42 and the above-mentioned fan system arranged in the housing 4. The fan system drives the oil smoke flow to be sucked into the housing 4 through the smoke inlet 41, and then enters the volute 1 through the front air inlet 110 and the rear air inlet 120 of the volute 1, and is output from the air outlet of the volute 1 (the air outlet of the volute 1 is designed with reference to the prior art, such as the air outlet is defined by the front and rear cover plates and the two ends of the annular wall 13) under the action of the rotating impeller 2, and finally discharged out of the housing 1 from the smoke outlet 42.

[0042] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "upper", "lower", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A fan system for a range hood, comprising: A volute (1) comprises a front cover plate (11), a rear cover plate (12) and an annular wall (13), wherein the front cover plate (11) is provided with a front air inlet (110) penetrating the wall thickness, the rear cover plate (12) is arranged relative to the front cover plate (11) and spaced apart, and is provided with a rear air inlet (120) penetrating the wall thickness, and the annular wall (13) is arranged between the front cover plate (11) and the rear cover plate (12); An impeller (2) is disposed in the volute (1); A motor (3), wherein the housing (30) is arranged at the inner periphery of the impeller (2) and is fixed relative to the volute (1), and the housing (30) has a front side surface (301) arranged toward the front air inlet (110) and a rear side surface (302) arranged toward the rear air inlet (120), and the rotating shaft (31) is connected to the impeller (2) and is used to drive the impeller (2) to rotate; Features: The front side surface (301) of the housing (30) is a first curved surface arched forward, and the rear side surface (302) of the housing (30) is a second curved surface arched backward, and the periphery of the first curved surface is connected to the periphery of the second curved surface.

2. The fan system according to claim 1, characterized in that: The first curved surface forms the pointed portion of the housing (30), and the curvature of the first curved surface is b, and the second curved surface forms the blunt portion of the housing (30), and the curvature of the second curved surface is a, and both satisfy: a / 10≤b≤a / 4.

3. The fan system according to claim 1, characterized in that: The rotating shaft (31) passes through the center of the first curved surface of the housing (30) and extends forward.

4. The fan system according to any one of claims 1 to 3, characterized in that: The periphery of the first curved surface is circular, and the first curved surface gradually arches forward from the periphery to the center; The periphery of the second curved surface is circular, and the second curved surface gradually arches backward from the periphery to the center.

5. The fan system according to claim 4, characterized in that: The periphery of the first curved surface and the periphery of the second curved surface are smoothly connected, and the connecting point (303) is the part with the largest diameter of the housing (30).

6. The fan system according to claim 5, characterized in that: The diameter of the connection point (303) is d1, and the diameter of the impeller (2) is d2, and both satisfy: 1 / 4≤d1 / d2≤1 / 2.

7. The fan system according to claim 6, characterized in that: The impeller (2) comprises a first end ring (21), a second end ring (22) arranged in a front-rear spacing, and blades (20) arranged between the first end ring (21) and the second end ring (22), wherein the blades (20) are at least three and are arranged in a circumferential direction of each end ring at intervals; The housing (30) of the motor (3) is located between the first end ring (21) and the second end ring (22), and is relatively close to the second end ring (22) and relatively far from the first end ring (21).

8. The fan system according to claim 7, characterized in that: The distance between the second end ring (22) and the connection point (303) in the front-to-back direction is denoted as L1, and the depth of the impeller (2) in the front-to-back direction is denoted as H. Both satisfy: 1 / 10≤L1 / H≤1 / 8.

9. The fan system according to claim 7, characterized in that: A radial distance L2 between the connection point (303) and the second end ring (22) is 5 to 10 mm.

10. The fan system according to claim 7, characterized in that: It also includes a middle plate (23) which is vertically arranged between the first end ring (21) and the second end ring (22) and on the front side of the casing (30), and the edge of the middle plate (23) is connected to the impeller (2), and the central part of the middle plate (23) is connected to the rotating shaft (31) of the motor (3); The distance L3 between the portion of the first curved surface with a diameter of d1 / 2 and the edge of the middle plate (23) in the front-to-back direction is 5 to 10 mm.

11. A range hood, characterized in that A fan system as claimed in any one of claims 1 to 10.

Images