An oil fume suction machine

Abstract

The present invention discloses an oil fume suction machine, which includes a smoke collecting hood, a box body and a fan assembly. The fan assembly includes a main fan system, a sub-fan system and a motor. The main fan system and the sub-fan system are driven by the motor to rotate coaxially. An air suction opening is provided at the upper part of the smoke collecting hood, and the air suction opening is communicated with the air inlet of the main fan system. Side air ducts are formed on both sides of the smoke collecting hood. A central air duct protrudes from the inner wall of the front surface of the smoke collecting hood. The side wall of the air suction area on the inner side of the side air duct forms a swirl surface for making the airflow flowing through it rotate. A first exhaust hole facing the swirl surface is provided in the central air duct. A second exhaust hole arranged vertically and discharging air forward is provided on the side air duct. A ventilation duct is provided in the smoke collecting hood. The air outlet of the sub-fan system is connected to the side air duct and the central air duct through the ventilation duct. It has a high smoke gathering effect.

Description

Technical Field

[0001] The present invention relates to the field of range hoods, and particularly to a range hood. Background Art

[0002] When a traditional range hood inhales air, its air intake range is a hemispherical area, and the air in all directions is inhaled without difference. In this air intake mode, the air flow velocity at the air intake position is relatively large, while the air flow velocity away from the air intake position will rapidly decrease as the distance from the air intake increases. Therefore, within a very short distance below the air intake, the upward velocity of the air has already become very small, resulting in insufficient upward suction force and being extremely vulnerable to external factors, such as being easily affected by factors that can disturb the air flow, such as the movement of people, the operation of fans or air conditioners, etc., so that the oil fume or pollutants will escape along with the flow of the disturbed air flow, resulting in poor smoke collection and smoking effects of the range hood. Summary of the Invention

[0003] One of the problems existing in the related art is to be solved to a certain extent in the present invention. To this end, the purpose of the present invention is to propose a range hood with a high smoke collection effect.

[0004] The above object is achieved by the following technical solutions:

[0005] A range hood includes a smoke collecting hood, a box body, and a fan assembly. The box body is disposed on the smoke collecting hood, and the fan assembly is disposed inside the box body. The fan assembly includes a main fan system, a sub-fan system, and a motor. The main fan system and the sub-fan system are driven by the motor to rotate coaxially. An air intake is provided at the upper part of the smoke collecting hood, and the air intake is communicated with the air inlet of the main fan system. Side air ducts are formed on both sides of the smoke collecting hood. A central air duct protrudes from the inner wall of the front surface of the smoke collecting hood. A swirl surface for rotating the air flow passing through it is formed on the inner side of the side air duct. A first exhaust hole for discharging air towards the swirl surface is provided in the central air duct. A second exhaust hole vertically arranged and discharging air forward is provided on the side air duct. A ventilation duct is provided inside the smoke collecting hood, and the air outlet of the sub-fan system is communicated with the side air duct and the central air duct through the ventilation duct.

[0006] As a further improvement of the present invention, the main fan system includes a main volute and a main impeller disposed inside the main volute. The sub-fan system includes a sub-volute and a sub-impeller disposed inside the sub-volute. The motor has a first output shaft and a second output shaft. The first output shaft is connected to the main impeller, and the second output shaft is connected to the sub-impeller. The main volute and the sub-volute are of an integral structure.

[0007] As a further improvement of the present invention, a front cavity of the box body is formed between the front of the main fan system and the front panel of the box body. The lower end of the front cavity of the box body is communicated with the air suction port of the smoke collecting hood, and the front cavity of the box body is communicated with the air inlet of the main fan system. The air outlet of the main fan system is communicated with an air outlet seat arranged on the box body.

[0008] As a further improvement of the present invention, a back cavity of the box body is formed between the back of the auxiliary fan system and the back plate of the box body. The upper end of the back cavity of the box body is communicated with the air inlet opened on the top of the box body, and the back cavity of the box body is communicated with the air inlet of the auxiliary fan.

[0009] As a further improvement of the present invention, the side air ducts are arranged obliquely forward from top to bottom on both sides of the smoke collecting hood. At least one row of second exhaust holes arranged vertically and discharging air forward are provided on the side air ducts, and the distance between the second exhaust holes and the edge of the side air ducts is less than 20 mm.

[0010] As a further improvement of the present invention, the swirling surface is an arc surface formed by the side air duct extending towards the front of the smoke collecting hood. The arc surface bends inwards towards the direction away from the central air duct, and the cross-section of the arc surface in the horizontal direction linearly increases from bottom to top.

[0011] As a further improvement of the present invention, a transition plane is formed between the arc surface and the central air duct. Any horizontal section of the arc surface is a quarter circle. One end of the arc is tangent to the transition plane, and the other end is tangent to the air discharging direction of the second exhaust hole.

[0012] As a further improvement of the present invention, the central air duct extends from below the air suction port towards the bottom of the smoke collecting hood and is vertically arranged on the inner wall of the front of the smoke collecting hood. At least one row of first exhaust holes arranged vertically and discharging air towards the swirling surface are provided on the opposite side walls of the central air duct.

[0013] As a further improvement of the present invention, an opening is provided at the top of the smoke collecting hood. The opening is communicated with the air outlet of the auxiliary fan system. The air inlet of the ventilation duct is communicated with the opening, and the air outlet of the ventilation duct is communicated with the first exhaust holes on the central air duct and the second exhaust holes on the side air ducts.

[0014] As a further improvement of the present invention, the ventilation duct is composed of several sections of hard pipes connected, or composed of a flexible pipe and a connector.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] 1. The present invention provides a range hood, which is provided with a main fan system and a sub - fan system. The main fan system is used for the normal suction of oil fume by the range hood, and the sub - fan system sucks clean air from the top of the range hood and blows it out through the first exhaust hole of the central air duct and the second exhaust hole of the side air duct via the internal ventilation duct. Due to the air viscosity effect, the airflow blown out from the first exhaust hole and the second exhaust hole will drive the surrounding airflow to flow together. Cooperating with the swirl surface, a swirling suction and gathering effect can be formed before the oil fume gas diffuses, achieving the effect of efficiently gathering and sucking oil fume. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a range hood;

[0018] Figure 2 is an exploded schematic diagram of a range hood;

[0019] Figure 3 is another exploded schematic diagram of a range hood;

[0020] Figure 4 is yet another exploded schematic diagram of a range hood

[0021] Figure 5 is still another exploded schematic diagram of a range hood;

[0022] Figure 6 is a top view of a range hood. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following embodiments are used to illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific embodiments of the present invention or equivalently replacing some technical features without departing from the spirit of the present invention's solution shall all be covered within the scope of the technical solution claimed by the present invention.

[0024] See the appendix Figure 1-6An oil fume extractor showing the present invention includes a smoke collecting hood 1, a box body 2 and a fan assembly 3. The box body 2 is arranged on the smoke collecting hood 1, and the fan assembly 3 is arranged inside the box body 2. The fan assembly 3 includes a main fan system 31, a sub-fan system 32 and a motor 33. An air suction port 12 is arranged at the upper part of the smoke collecting hood 1, and the air suction port 12 is communicated with the air inlet of the main fan system 31. Side air ducts 13 are formed on both sides of the smoke collecting hood 1. A central air duct 14 protrudes from the inner wall of the front surface of the smoke collecting hood 1. A swirling surface 15 for swirling the air flowing through it is formed inside the side air duct 13. A first exhaust hole 141 facing the swirling surface 15 is arranged in the central air duct 14. A second exhaust hole 131 arranged vertically and discharging air forward is arranged on the side air duct 13. A ventilation duct 16 is arranged inside the smoke collecting hood 1. The air outlet of the sub-fan system 32 is communicated with the side air duct 13 and the central air duct 14 through the ventilation duct 16. The main fan system 31 includes a main volute 311 and a main impeller arranged inside the main volute 311. The sub-fan system 32 includes a sub-volute 321 and a sub-impeller arranged inside the sub-volute 321. The motor has a first output shaft and a second output shaft. The first output shaft is connected to the main impeller, and the second output shaft is connected to the sub-impeller.

[0025] The main volute 311 and the sub-volute 321 are of an integral structure. When the oil fume extractor operates, the motor rotates, thereby driving the main fan system 31 and the sub-fan system 32 to start.

[0026] A front cavity of the box body 2 is formed between the front surface of the main fan system 31 and the front plate of the box body 2. The lower end of the front cavity of the box body 2 is communicated with the air suction port 12 of the smoke collecting hood 1, and the front cavity of the box body 2 is communicated with the air inlet of the main fan system 31. The air outlet of the main fan system 31 is communicated with an air outlet seat arranged on the box body 2. The main fan system 31 is used for the normal suction of oil fume by the oil fume extractor. The oil fume enters the front cavity of the box body 2 through the air suction port 12 of the smoke collecting hood 1, then enters the air inlet of the main fan system 31, and is then discharged outwards through the air outlet of the main fan system 31.

[0027] A back cavity of the box body 2 is formed between the back surface of the sub-fan system 32 and the back plate of the box body 2. The upper end of the back cavity of the box body 2 is communicated with an air inlet 21 opened on the top of the box body 2, and the back cavity of the box body 2 is communicated with the air inlet of the sub-fan. The sub-fan system 32 sucks clean air from the top of the oil fume machine. The air enters the back cavity of the box body 2 from the air inlet at the top of the box body 2, passes through the air inlet of the sub-fan system 32, and is discharged from the air outlet of the sub-fan system 32.

[0028] An opening is provided at the top of the smoke collecting hood 1, and the opening is communicated with the air outlet of the auxiliary fan system 32. The air inlet of the ventilation duct 16 is communicated with the opening, and the air outlet of the ventilation duct 16 is communicated with the first exhaust hole 141 on the central air duct 14 and the second exhaust hole 131 on the side air duct 13. The ventilation duct 16 is connected by a plurality of sections of rigid pipes or is composed of a flexible pipe and a connector. After the air is discharged from the air outlet of the auxiliary fan system 32, it enters the ventilation duct 16 through the top opening of the smoke collecting hood 1, and then is blown out from the first exhaust hole 141 on the central air duct 14 and the second exhaust hole 131 on the side air duct 13.

[0029] The side air duct 13 is arranged obliquely forward from top to bottom on both sides of the smoke collecting hood 1. At least one row of second exhaust holes 131 arranged vertically and discharging air forward is provided on the side air duct 13, and the distance between the second exhaust hole 131 and the edge of the side air duct 13 is less than 20 mm. In this embodiment, one row of second exhaust holes 131 is provided on the side air duct 13, and the distance between the second exhaust hole 131 and the edge of the side air duct 13 is 10 mm. The exhaust holes can be set in shapes such as round holes, long strip holes, polygons, star-shaped holes, etc.

[0030] The swirling surface 15 is an arc surface formed by the side air duct 13 extending towards the front of the smoke collecting hood 1. The arc surface bends inwards towards the direction away from the central air duct 14, and the cross-section of the arc surface in the horizontal direction linearly increases from bottom to top. A transition plane 17 is formed between the arc surface and the central air duct 14. Any horizontal section of the arc surface is a quarter circle. One end of the arc is tangent to the transition plane 17, and the other end is tangent to the air outlet direction of the second exhaust hole 131. The side air duct 13 includes a left air duct and a right air duct, which are respectively on the left and right sides of the smoke collecting hood 1. The left arc surface is formed by the left air duct extending towards the front of the smoke collecting hood 1, and the right arc surface is formed by the right air duct extending towards the front of the smoke collecting hood 1.

[0031] The central air duct 14 extends from below the air suction port 12 towards the bottom of the smoke collecting hood 1 and is vertically arranged on the inner wall of the front surface of the smoke collecting hood 1. At least one row of first exhaust holes 141 that are vertically arranged and discharge air towards the swirl surface 15 are provided on the opposite side walls of the central air duct 14. A row of first exhaust holes 141 is provided on the left side wall of the central air duct 14, and a row of first exhaust holes 141 is provided on the right side wall of the central air duct 14. The first exhaust holes 141 on the right side wall discharge air towards the right arc surface direction, and the first exhaust holes 141 on the left side wall discharge air towards the left arc surface direction. The gas blown out from the first exhaust holes 141 of the central air duct 14 blows towards the swirl surface 15 through the transition plane 17, and the gas smoothly turns to form a swirl. The gas blown out from the second exhaust holes 131 of the side air duct 13 can drive the surrounding gas to flow due to the viscous effect of the gas, accelerating the swirling gas discharged from the first exhaust holes 141. Cooperating with the upward suction force of the air suction port 12, a spiral upward air flow can be formed. A swirling suction and gathering effect can be formed before the oil fume gas diffuses, preventing the oil fume from diffusing and escaping, and achieving the effect of highly gathering and sucking the oil fume.

[0032] The above preferred embodiments should be regarded as illustrative examples of the implementation modes of the solution of this application. All technical deductions, substitutions, improvements, etc. that are identical, similar to or based on this application solution shall be regarded as within the protection scope of this patent.

Claims

1. An oil fume suction machine, comprising a smoke collecting hood (1), a box body (2) and a fan assembly (3), wherein the box body (2) is arranged on the smoke collecting hood (1), and the fan assembly (3) is arranged in the box body (2), and is characterized in that: The blower assembly (3) includes a main blower system (31), a secondary blower system (32) and a motor (33). The main blower system (31) and the secondary blower system (32) are coaxially rotated by the motor (33). A front cavity of the box body (2) is formed between the front of the main blower system (31) and the front plate of the box body (2), and a back cavity of the box body (2) is formed between the back of the secondary blower system (32) and the back plate of the box body (2). An air suction port (12) is provided at the upper part of the smoke collecting hood (1). The air suction port (12) is communicated with the air inlet of the main blower system (31). Side air ducts (13) are formed on both sides of the smoke collecting hood (1). A central air duct (14) protrudes from the inner wall of the front of the smoke collecting hood (1). A swirl surface (15) for making the air flow passing through it rotate is formed inside the side air duct (13). At least one row of first exhaust holes (141) which are vertically arranged and discharge air towards the swirl surface (15) are provided on the opposite side walls of the central air duct (14). A ventilation duct (16) is provided in the smoke collecting hood (1). The air outlet of the secondary blower system (32) is communicated with the side air duct (13) and the central air duct (14) through the ventilation duct (16). The side air ducts (13) are arranged obliquely forward from top to bottom on both sides of the smoke collecting hood (1). At least one row of second exhaust holes (131) which are vertically arranged and discharge air forward are provided on the side air ducts (13). The swirl surface (15) is an arc surface formed by the side air duct (13) extending towards the front of the smoke collecting hood (1). The arc surface bends inwards towards the direction away from the central air duct (14), and the cross-section of the arc surface in the horizontal direction linearly increases from bottom to top.

2. The range hood according to claim 1, wherein: The main blower system (31) includes a main volute (311) and a main impeller (312) arranged in the main volute (311). The secondary blower system (32) includes a secondary volute (321) and a secondary impeller (322) arranged in the secondary volute (321). The motor (33) has a first output shaft and a second output shaft. The first output shaft is connected to the main impeller (312), the second output shaft is connected to the secondary impeller (322), and the main volute (311) and the secondary volute (321) are of an integral structure.

3. The range hood according to claim 1, characterized in that: The lower end of the front cavity of the box body (2) is communicated with the air suction port (12) of the smoke collecting hood (1), and the front cavity of the box body (2) is communicated with the air inlet of the main blower system (31). The air outlet of the main blower system (31) is communicated with an air outlet seat arranged on the box body (2).

4. The range hood according to claim 1, characterized in that: The upper end of the back cavity of the box body (2) is communicated with an air inlet (21) opened on the top of the box body (2), and the back cavity of the box body (2) is communicated with the air inlet of the secondary blower.

5. An oil fume extractor according to any one of claims 1 to 4, characterized in that: The distance between the second exhaust hole (131) and the edge of the side air duct (13) is less than 20 mm.

6. A range hood according to any one of claims 1-4, characterized in that: A transition plane (17) is formed between the arc surface and the central air duct (14). Any horizontal section of the arc surface is a quarter circle. One end of the arc is tangent to the transition plane (17), and the other end is tangent to the air outlet direction of the second exhaust hole (131).

7. A range hood according to any one of claims 1-4, characterized in that: The central air duct (14) extends from below the air suction port (12) towards the bottom of the smoke collecting hood (1) and is vertically arranged on the inner wall of the front surface of the smoke collecting hood (1).

8. A range hood according to any one of claims 1-4, characterized in that: An opening is provided at the top of the smoke collecting hood (1). The opening is communicated with the air outlet of the auxiliary fan system (32). The air inlet of the ventilation duct (16) is communicated with the opening. The air outlet of the ventilation duct (16) is communicated with the first exhaust hole (141) on the central air duct (14) and the second exhaust hole (131) on the side air duct (13).

9. The range hood according to claim 8, wherein: The ventilation duct (16) is connected by several sections of rigid pipes or is composed of a flexible pipe and a connector.

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