Range hood

Abstract

The utility model relates to a range hood, which comprises: a box body, which is internally provided with a smoke discharge channel with a smoke inlet and a smoke outlet; the fan is arranged in the smoke exhaust channel and is used for driving oil smoke to be sucked into the box body from the smoke inlet and discharged from the smoke outlet; a circuit board is arranged in the electric appliance box, the electric appliance box is arranged outside the smoke exhaust channel, and heat dissipation holes are formed in the box wall of the electric appliance box; the driving fan is provided with a rotating shaft and fan blades arranged on the periphery of the rotating shaft in the circumferential direction, the fan blades are located in the smoke exhaust channel, the extending direction of the rotating shaft intersects with the extending direction of the smoke exhaust channel, and the rotating shaft is restrained in the box body in the mode that the rotating shaft can rotate around the axis of the rotating shaft; the driving fan rotates under the action of air flow in the smoke exhaust channel; and the cooling fan is arranged in the electric appliance box and is connected with the rotating shaft so as to rotate along with the rotating shaft. Compared with the prior art, the air flow in the smoke exhaust channel can be utilized to drive the heat dissipation fan to rotate so as to realize heat dissipation in the electric appliance box.

Description

Technical Field

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

[0002] With the development of technology, the performance requirements of range hoods are gradually increasing, and the air volume is gradually increasing, but this brings about the problem that the current of the motor is gradually increasing, the temperature rise of the range hood circuit board is increased, and the heat dissipation capacity of the circuit board itself is required to be increased. In order to improve the heat dissipation capacity of the circuit board, the conventional solution is to increase the area of ​​the circuit board heat sink or increase the space around the circuit board. For example, the heat dissipation structure disclosed in the Chinese utility model patent "An electrical box heat dissipation structure and a range hood with the heat dissipation structure" with patent number 202220102344.3 and authorization announcement number CN218301979U includes an electrical box, and a control board is arranged in the electrical box. The heat dissipation structure of the electrical box also includes a first radiator for conducting the heat generated by the chip to be dissipated on the control board, and a second radiator for conducting the heat on the first radiator to the air, and the heat dissipation effect of the control board in the electrical box is improved by the radiator. However, the setting of the radiator will increase energy consumption.

[0003] For example, the scheme disclosed in the Chinese invention patent "Heat dissipation method for range hood control board" with patent number 202110077392.1 and authorization announcement number CN112930082B includes a radiator, which is arranged in the electrical box and attached to the power module of the control board; a water pipe, which is arranged in the electrical box and embedded in the radiator; a water pump, which is arranged outside the electrical box, and the outlet of the water pump is connected to the water inlet of the water pipe; a valve body, which is arranged outside the electrical box, the first connecting port of the valve body is connected to the water outlet of the water pipe, and the second connecting port of the valve body is connected to the return port of the water pump, so that the power module of the range hood control board can be cooled by utilizing the water flow in the radiator and the water pipe. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a range hood which can effectively realize the heat dissipation of a circuit board in view of the current status of the prior art.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a range hood, comprising:

[0006] A box body, which has a smoke exhaust passage with a smoke inlet and a smoke outlet inside;

[0007] The fan is arranged in the smoke exhaust passage, and is used to drive the oil smoke to be sucked into the box body from the smoke inlet and discharged from the smoke outlet;

[0008] An electrical box with a circuit board inside is arranged outside the smoke exhaust passage, and a box wall of the electrical box is provided with heat dissipation holes;

[0009] It is characterized by also including:

[0010] A driving fan comprises a rotating shaft and blades arranged circumferentially around the rotating shaft, wherein the blades are located in the smoke exhaust passage, the extending direction of the rotating shaft intersects with the extending direction of the smoke exhaust passage, and the rotating shaft is constrained to the housing in a manner of being rotatable around its own axis, so that the driving fan rotates under the action of the airflow in the smoke exhaust passage;

[0011] The heat dissipation fan is arranged in the electrical box and connected to the rotating shaft so as to rotate along with the rotating shaft.

[0012] When in use, the fan rotates to drive the oil fume airflow from the smoke inlet to the smoke outlet. The flowing oil fume airflow can drive the driving fan to rotate, thereby driving the cooling fan in the electrical box to rotate synchronously. The rotating cooling fan can promote the air flow inside the electrical box, thereby achieving the heat dissipation of the circuit board in the electrical box; that is, the utility model uses the kinetic energy of the oil fume airflow in the exhaust channel to drive the cooling fan to rotate, and there is no need to set up a motor or other power parts for driving the fan to rotate, thereby reducing energy consumption. In addition, during the heat dissipation process, the circuit board will not be affected by the oil fume airflow in the exhaust channel, thereby ensuring the reliability of the circuit board.

[0013] Preferably, the blades of the heat dissipation fan are circumferentially arranged on the periphery of the rotating shaft.

[0014] Preferably, the diameter formed by the blades of the heat dissipation fan is smaller than the diameter formed by the blades of the driving fan, so that the driving fan can smoothly drive the blades of the heat dissipation fan to rotate; and the blade size of the heat dissipation fan can be well adapted to an electrical box with limited internal space.

[0015] Preferably, the extending direction of the rotating shaft is perpendicular to the extending direction of the smoke exhaust channel.

[0016] Preferably, the driving fan is arranged relatively close to the smoke outlet of the smoke exhaust channel. In this way, the influence of the driving fan on the airflow in the smoke exhaust channel can be reduced, and the airflow at the smoke outlet of the range hood is generally cleaner than the airflow at the smoke inlet, that is, there is less oil smoke in the airflow, thereby reducing the influence of the oil smoke on the driving fan.

[0017] In the above schemes, preferably, the driving fan is arranged near the first side wall on one side of the smoke exhaust channel, the first end of the rotating shaft is connected to the fan blade, and the second end passes through the first side wall and is connected to the cooling fan.

[0018] Preferably, the smoke exhaust passage extends in an up-down direction;

[0019] It also includes a guide plate, which is arranged in the smoke exhaust channel, and the first plate surface of the guide plate is opposite to the first side wall of the smoke exhaust channel to form a guide channel that runs through from top to bottom, so that the blades of the driving fan can be placed therein; the second plate surface of the guide plate is opposite to the second side wall on the other side of the smoke exhaust channel.

[0020] When in use, a part of the airflow in the smoke exhaust channel passes through the guide channel to drive the driving fan to rotate, and the other part of the airflow passes between the second plate surface of the guide plate and the second side wall of the smoke exhaust channel. The two airflows flow separately, so that the driving fan is not affected by the other part of the airflow when rotating.

[0021] Furthermore, the guide plate in the utility model can also play the role of guiding oil liquid, so that the oil liquid in the smoke exhaust channel can flow down along the plate surface of the guide plate, thereby avoiding the accumulation of oil liquid at the driving fan.

[0022] Preferably, the lower end of the guide channel is the airflow inlet end, and the upper end is the airflow outlet end, and along the flow direction of the airflow from bottom to top, the flow area on the cross section of the guide channel gradually increases, so that a small part of the airflow in the exhaust channel enters the guide channel to drive the fan to rotate, thereby preventing the strong wind in the exhaust channel from affecting the rotation of the drive fan.

[0023] Preferably, the guide plate is an arc-shaped plate arched toward the second side wall of the smoke exhaust channel. The arc-shaped plate can reduce the flow resistance of the airflow.

[0024] Preferably, the guide plate is relatively close to the first side wall of the smoke exhaust channel and relatively far from the second side wall of the smoke exhaust channel, so that less airflow enters the guide channel, reducing the impact of the strong airflow in the smoke exhaust channel on the driving fan, and ensuring that most of the airflow can pass through the smoke exhaust channel normally.

[0025] Compared with the prior art, the utility model has the following advantages: by setting a driving fan in the smoke exhaust channel and a cooling fan in the electrical box, when in use, the fan rotates to drive the oil smoke airflow from the smoke inlet to the smoke outlet, and the flowing oil smoke airflow can drive the driving fan to rotate, thereby driving the cooling fan in the electrical box to rotate synchronously, and the rotating cooling fan can promote the air flow inside the electrical box, thereby realizing the heat dissipation of the circuit board in the electrical box; that is, the utility model uses the kinetic energy of the oil smoke airflow in the smoke exhaust channel to drive the cooling fan to rotate, and there is no need to set up a motor or other power parts for driving the fan to rotate, thereby reducing energy consumption. In addition, during the heat dissipation process, the circuit board will not be affected by the oil smoke airflow in the smoke exhaust channel, thereby ensuring the reliability of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of an embodiment of the utility model (the cross section is a vertical plane extending left and right);

[0027] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0028] Figure 3 It is a cross-sectional view of an embodiment of the utility model (the cross-section is a vertical plane extending front and back);

[0029] Figure 4 It is a partial structural schematic diagram of an embodiment of the utility model;

[0030] Figure 5 for Figure 4 Schematic diagram of the structure from another perspective. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] like Figures 1 to 5 As shown, a preferred embodiment of a range hood of the utility model is shown, and the range hood includes a housing 1, a fan 2, an electrical box 3, a driving fan 4, a cooling fan 5 and a guide plate 6.

[0033] The box body 1 has a smoke exhaust passage 10 inside, and the lower end of the smoke exhaust passage 10 is a smoke inlet 1a, and the upper end is a smoke outlet 1b. The portion of the smoke exhaust passage 10 relatively close to the smoke outlet 1b extends up and down, and has a first side wall 11 located on one side and a side wall 12 opposite to the first side wall 11.

[0034] The fan 2 is an existing centrifugal fan, which is arranged in the smoke exhaust passage 10 and is used to drive the oil smoke to be sucked into the box body 1 through the smoke inlet 1a and discharged through the smoke outlet 1b.

[0035] The electrical box 3 is arranged outside the smoke exhaust passage 10 , and a circuit board 31 for controlling the operation of the fan 2 is arranged inside the electrical box 3 . The wall of the electrical box 3 is provided with heat dissipation holes 32 , which connect the outside with the internal space of the electrical box 3 .

[0036] The guide plate 6 is disposed in the smoke exhaust passage 10, and the first plate surface of the guide plate 6 is spaced opposite to the first side wall 11 of the smoke exhaust passage 10 to form a guide passage 60 that passes through from top to bottom. The lower end of the guide passage 60 is the airflow inlet end 6a, and the upper end is the airflow outlet end 6b. Along the flow direction of the airflow from bottom to top, the flow area on the cross section of the guide passage 60 gradually increases. The second plate surface of the guide plate 6 is spaced opposite to the second side wall 12 of the smoke exhaust passage 10. In this embodiment, the guide plate 6 is an arc-shaped plate that arches toward the second side wall 12 of the smoke exhaust passage 10, and the guide plate 6 is relatively close to the first side wall 11 of the smoke exhaust passage 10 and relatively far away from the second side wall 12 of the smoke exhaust passage 10.

[0037] The driving fan 4 has a horizontally extending shaft 41 and blades 42 circumferentially arranged on the periphery of the first end of the shaft 41. The first end of the shaft 41 and the blades 42 are located in the above-mentioned guide channel 60. The second end of the shaft 42 passes through the first side wall 11 of the smoke exhaust channel 10 and the side wall of the electrical box 3 in sequence and is connected to the cooling fan in the electrical box 3. The blades 51 of the cooling fan 5 are circumferentially arranged on the periphery of the second end of the shaft 41, so that the shaft 41 is constrained to the housing 1 in a manner that it can rotate around its own axis. The driving fan 4 can rotate under the action of the airflow in the smoke exhaust channel 10, and at the same time drive the cooling fan 5 to rotate. In this embodiment, the diameter enclosed by the blades 51 of the cooling fan 5 is smaller than the diameter enclosed by the blades 42 of the driving fan 4. In order to allow the shaft 41 to rotate smoothly, the shaft 41 of this embodiment is constrained to the first side wall 11 by a bearing 7. For details, please refer to Figure 2 , 4 、5.

[0038] When in use, the fan 2 rotates to drive the oil fume airflow from the smoke inlet 1a to the smoke outlet 1b. The flowing oil fume airflow can drive the driving fan 4 to rotate, thereby driving the cooling fan 5 in the electrical box 3 to rotate synchronously. The rotating cooling fan 5 can promote the air flow inside the electrical box 3, so that the hot air in the electrical box 3 is discharged from the heat dissipation holes 32, thereby realizing the heat dissipation of the circuit board 31 in the electrical box 3.

Claims

1. A range hood, comprising: A box body (1) having a smoke exhaust passage (10) with a smoke inlet (1a) and a smoke outlet (1b) inside; The fan (2) is arranged in the smoke exhaust passage (10) and is used to drive the oil smoke to be sucked into the box body (1) through the smoke inlet (1a) and discharged through the smoke outlet (1b); An electrical box (3) having a circuit board (31) inside is arranged outside the smoke exhaust passage (10), and a box wall of the electrical box (3) is provided with heat dissipation holes (32); Features Also included are: A driving fan (4) comprises a rotating shaft (41) and fan blades (42) arranged circumferentially around the rotating shaft (41), wherein the fan blades (42) are located in the smoke exhaust passage (10), the extending direction of the rotating shaft (41) intersects with the extending direction of the smoke exhaust passage (10), and the rotating shaft (41) is constrained to the housing (1) in a manner that it can rotate around its own axis, so that the driving fan (4) rotates under the action of the airflow in the smoke exhaust passage (10); A heat dissipation fan (5) is disposed in the electrical box (3) and is connected to the rotating shaft (41) so as to rotate along with the rotating shaft (41).

2. The range hood according to claim 1, characterized in that: The blades (51) of the heat dissipation fan (5) are arranged on the periphery of the rotating shaft (41) along the circumferential direction.

3. The range hood according to claim 2, characterized in that: The diameter formed by the blades (51) of the heat dissipation fan (5) is smaller than the diameter formed by the blades (42) of the driving fan (4).

4. The range hood according to claim 1, characterized in that: The extending direction of the rotating shaft (41) is perpendicular to the extending direction of the smoke exhaust channel (10).

5. The range hood according to claim 1, characterized in that: The driving fan (4) is arranged relatively close to the smoke outlet (1b) of the smoke exhaust channel (10).

6. The range hood according to any one of claims 1 to 5, characterized in that: The driving fan (4) is arranged on a first side wall (11) close to one side of the smoke exhaust passage (10); a first end of the rotating shaft (41) is connected to the fan blade (42); and a second end passes through the first side wall (11) and is connected to the heat dissipation fan (5).

7. The range hood according to claim 6, characterized in that: The extension direction of the smoke exhaust channel (10) is the up-down direction; It also includes a guide plate (6) disposed in the smoke exhaust channel (10), wherein a first plate surface of the guide plate (6) is spaced apart from a first side wall (11) of the smoke exhaust channel (10) to form a guide channel (60) that is through-and-through, so that the fan blades (42) of the driving fan (4) can be placed therein; The second plate surface of the guide plate (6) is spaced apart from and opposed to the second side wall (12) on the other side of the smoke exhaust channel (10).

8. The range hood according to claim 7, characterized in that: The lower end of the guide channel (60) is an airflow inlet end (6a), and the upper end is an airflow outlet end (6b). Along the flow direction of the airflow from bottom to top, the flow area on the cross section of the guide channel (60) gradually increases.

9. The range hood according to claim 8, characterized in that: The guide plate (6) is an arc-shaped plate arched toward the second side wall (12) of the smoke exhaust channel (10).

10. The range hood according to claim 9, characterized in that: The guide plate (6) is relatively close to the first side wall (11) of the smoke exhaust channel (10), and relatively far away from the second side wall (12) of the smoke exhaust channel (10).

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