CN219300833U

CN219300833U - Fume exhaust fan

Info

Publication number: CN219300833U
Application number: CN202223434757.0U
Authority: CN
Inventors: 张云鹏; 孟永哲; 管国虎; 陈文海; 刘凡
Original assignee: Haier Smart Home Co Ltd; Qingdao Haier Wisdom Kitchen Appliance Co Ltd
Current assignee: Haier Smart Home Co Ltd; Qingdao Haier Wisdom Kitchen Appliance Co Ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-07-04
Anticipated expiration: 2032-12-21

Abstract

The utility model relates to the technical field of household appliances and discloses a range hood. The lampblack absorber includes collection petticoat pipe, smoke sense module and mechanism of blowing for form collection smoke chamber, the smoke sense module sets up in collection smoke intracavity, and the smoke sense module includes housing assembly and signal transceiver module, and signal transceiver module sets up in housing assembly, is provided with the opening on the housing assembly, and the opening is used for supplying the signal to pass through, and signal transceiver module can detect the oil smoke concentration in the collection smoke intracavity, and the mechanism of blowing includes positive pressure gas generation subassembly and trachea subassembly, and positive pressure gas generation subassembly is used for producing the positive pressure air current, and the end of giving vent to anger of positive pressure gas generation subassembly is linked together through trachea subassembly and housing assembly's inside, in order to blow in to housing assembly. The range hood disclosed by the utility model can prevent oil smoke from being deposited on the signal receiving and transmitting assembly of the smoke sensing assembly, improve the detection accuracy of the smoke sensing module and ensure the normal operation of the automatic control function of the range hood.

Description

Fume exhaust fan

Technical Field

The utility model relates to the technical field of household appliances, in particular to a range hood.

Background

With the continuous development of technology, some range hoods are provided with a smoke sensing module in a smoke collecting cavity, the smoke concentration in the smoke collecting cavity is detected through the smoke sensing module, and the suction force of the range hoods is automatically adjusted according to the detection result of the smoke sensing module.

In the prior art, a smoke sensing module generally comprises a shell, wherein a signal receiving and transmitting end is arranged in the shell, an opening which is communicated with the inside and the outside of the shell is formed in the shell, and the opening is used for passing signals. However, when the range hood works, oil smoke in the smoke collecting cavity enters the shell through the opening and is deposited on the surface of the signal receiving and transmitting end, and long-time deposition of the oil smoke can cause inaccurate detection of the smoke sensing module, so that the use of the range hood is affected.

Therefore, there is a need for a range hood to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a range hood, which can prevent oil smoke from being deposited on a signal receiving and transmitting assembly of a smoke sensing assembly, improve the detection accuracy of the smoke sensing module and ensure the normal operation of an automatic control function of the range hood.

To achieve the purpose, the utility model adopts the following technical scheme:

a range hood, comprising:

the fume collecting hood is used for forming a fume collecting cavity;

the smoke sensing module is arranged in the smoke collecting cavity and comprises a shell component and a signal receiving and transmitting component, the signal receiving and transmitting component is arranged in the shell component, an opening is formed in the shell component and is used for allowing a signal to pass through, and the signal receiving and transmitting component can detect the concentration of oil smoke in the smoke collecting cavity;

the blowing mechanism comprises a positive pressure gas generating assembly and a gas pipe assembly, wherein the positive pressure gas generating assembly is used for generating positive pressure gas flow, and the gas outlet end of the positive pressure gas generating assembly is communicated with the inside of the shell assembly through the gas pipe assembly so as to blow gas into the shell assembly.

As an alternative, the housing assembly includes a first housing and a second housing, each of which has an opening;

the signal receiving and transmitting assembly comprises a signal transmitting end and a signal receiving end, the signal transmitting end is arranged in the first shell, and the signal receiving end is arranged in the second shell;

the air pipe assembly comprises a first air pipe and a second air pipe, the first air pipe is communicated with the air outlet end of the positive pressure air generating assembly and the interior of the first shell, and the second air pipe is communicated with the air outlet end of the positive pressure air generating assembly and the interior of the second shell.

As an alternative, the first housing is provided with a first air inlet, the first air pipe is connected to the first air inlet, and the first air inlet is opposite to the opening on the first housing; and/or

The second shell is provided with a second air inlet, the second air pipe is connected to the second air inlet, and the second air inlet is opposite to the opening in the second shell.

As an alternative scheme, the smoke sensing module further comprises a mounting bracket, the mounting bracket is connected with the smoke collecting cover, and the first shell and the second shell are both mounted on the mounting bracket.

As an alternative scheme, the first shell includes first grafting portion, the second shell includes second grafting portion, be provided with first grafting groove and second grafting groove on the installing support, first grafting portion peg graft in the first grafting groove, second grafting portion peg graft in the second grafting groove.

As an alternative, the first housing further includes a first mounting protrusion, the first mounting protrusion being disposed on the first socket portion, and the second housing further includes a second mounting protrusion, the second mounting protrusion being disposed on the second socket portion;

the mounting bracket is provided with a first positioning groove on one side of the first inserting groove, the first mounting bulge is limited in the first positioning groove, the mounting bracket is provided with a second positioning groove on one side of the second inserting groove, and the second mounting bulge is limited in the second positioning groove.

As an alternative scheme, the smoke sensing module further comprises a first wire and a second wire, a first wire outlet hole is formed in the bottom of the first inserting groove, one end of the first wire is connected with the signal transmitting end, and the other end of the first wire sequentially penetrates through the first inserting portion and the first wire outlet hole and then stretches into the space between the mounting bracket and the smoke collecting cover;

the bottom of second spliced groove is provided with the second wire hole, second wire one end with signal receiving end is connected, and the other end wears to establish in proper order the second grafting portion with stretch into behind the second wire hole between the installing support with the collection petticoat pipe.

As an alternative scheme, the mounting bracket is provided with a wire guiding groove towards one side of the fume collecting hood, the wire guiding groove is used for accommodating and limiting the first wire and the second wire, the side wall of the wire guiding groove is provided with a wire outlet, and the first wire and the second wire stretch out of the mounting bracket from the wire outlet.

As an alternative, the air inlet end of the positive pressure air generating component is communicated with the outside of the range hood.

As an alternative, the positive pressure gas generating assembly is a gas pump.

As an alternative, the positive pressure gas generating assembly is arranged outside the smoke collecting cavity; or (b)

The positive pressure gas generating assembly is arranged inside the smoke collecting cavity, and the air inlet end of the positive pressure gas generating assembly is communicated with the outside of the range hood through a communicating pipe.

The utility model has the beneficial effects that:

according to the range hood, the signal receiving and transmitting assembly of the smoke sensing module can detect the oil smoke concentration in the smoke collecting cavity, and the positive pressure gas generating assembly blows air into the shell assembly of the smoke sensing module through the air pipe assembly, so that the interior of the shell assembly is a positive pressure environment relative to the smoke collecting cavity, and oil smoke can be prevented from entering the shell assembly from the opening of the shell assembly, further, the oil smoke is prevented from being deposited on the signal receiving and transmitting assembly, the detection accuracy of the smoke sensing module is ensured, and further, the normal use of the range hood with the function of automatically controlling suction force is ensured.

Drawings

Fig. 1 is a schematic view of a partial structure of a range hood according to an embodiment of the present utility model in a front view;

fig. 2 is a schematic view of a partial structure of a range hood according to an embodiment of the present utility model in a rear side view;

FIG. 3 is a schematic view of a smoke sensor module according to an embodiment of the present utility model under a viewing angle;

FIG. 4 is a schematic diagram of an exploded state of a smoke sensor module according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of a smoke sensor module according to an embodiment of the utility model under another view angle.

In the figure:

11. a housing; 12. a fume collecting hood;

2. a smoke sensing module;

21. a first housing; 211. a first air inlet; 212. a first plug-in connection; 213. a first mounting projection; 214. a first body portion;

22. a second housing; 221. a second air inlet; 222. a second plug-in connection; 223. a second mounting projection; 224. a second body portion;

23. an opening;

24. a mounting bracket; 241. a first socket groove; 242. a second insertion groove; 243. a first positioning groove; 244. a second positioning groove; 245. a first sealing rib; 246. a second sealing rib; 247. a first wire outlet hole; 248. a second wire outlet hole; 249. a wire slot; 250. a wire outlet;

3. an air blowing mechanism; 31. a positive pressure gas generating assembly; 32. a tracheal assembly; 321. a first air tube; 322. and a second air pipe.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 and 2, the present embodiment provides a range hood including a housing 11 and a smoke collecting hood 12. Wherein the shell 11 forms a certain accommodation space, the fume collecting hood 12 is arranged in the accommodation space, the fume collecting hood 12 directly forms a fume collecting cavity or the fume collecting hood 12 and the shell 11 form a fume collecting cavity together. The range hood further comprises a fan, when the range hood works, the fan enables negative pressure to be generated in the smoke collecting cavity, so that the oil smoke on the front side of the range hood is sucked into the smoke collecting cavity and finally discharged to the outside of the range hood.

Preferably, as shown in fig. 2 and 3, the range hood further comprises a smoke sensing module 2, the smoke sensing module 2 is arranged in the smoke collecting cavity, the smoke sensing module 2 comprises a shell component and a signal receiving and transmitting component, the signal receiving and transmitting component is arranged in the shell component, an opening 23 is formed in the shell component, the opening 23 is used for allowing signals sent or received by the signal receiving and transmitting component to pass through, the signal receiving and transmitting component can detect the oil smoke concentration in the smoke collecting cavity, the range hood can control the output power of the fan according to the oil smoke concentration detected by the temperature sensing module, even if the range hood can realize automatic control of suction force, manual adjustment is not needed, and user experience is good.

Preferably, as shown in fig. 2, the range hood further comprises an air blowing mechanism 3, the air blowing mechanism 3 comprises a positive pressure air generating assembly 31 and an air pipe assembly 32, the positive pressure air generating assembly 31 is used for generating positive pressure air, and an air outlet end of the positive pressure air generating assembly 31 is communicated with the inside of the shell assembly through the air pipe assembly 32. When the range hood works, the positive pressure gas generating component 31 blows gas into the shell component of the smoke sensing module 2 through the gas pipe component 32, so that the interior of the shell component is a positive pressure environment relative to the smoke collecting cavity, and thus, the oil smoke can be prevented from entering the shell component from the opening 23 of the shell component, and then, the oil smoke is prevented from being deposited on the signal receiving and transmitting component, the detection accuracy of the smoke sensing module 2 is ensured, and the normal use of the function of the automatic control suction force of the range hood is further ensured.

In this embodiment, as shown in fig. 2 and fig. 3, the housing assembly includes a first housing 21 and a second housing 22, openings 23 are respectively provided on the first housing 21 and the second housing 22, the signal transceiver assembly includes a signal transmitting end and a signal receiving end, the signal transmitting end is disposed in the first housing 21, the signal receiving end is disposed in the second housing 22, and an axis of the first housing 21 and an axis of the second housing 22 are disposed at an included angle, so that a signal transmitting direction of the signal transmitting end and a receiving direction of the signal receiving end are disposed at an included angle. The signal transmitting end can transmit detection signals, the detection signals are refracted after contacting the oil fume, and the signal receiving end can receive the refracted signals, so that the concentration of the oil fume in the fume collecting cavity is calculated. Alternatively, the signal emitted by the signal emitting end may be an infrared signal.

As shown in fig. 2, the air pipe assembly 32 includes a first air pipe 321 and a second air pipe 322, the first air pipe 321 is communicated with the air outlet end of the positive pressure air generating assembly 31 and the inside of the first housing 21, and the second air pipe 322 is communicated with the air outlet end of the positive pressure air generating assembly 31 and the inside of the second housing 22, so that positive pressure states can be formed in the first housing 21 and the second housing 22, and further, no oil smoke is deposited on the signal transmitting end and the signal receiving end.

In other embodiments, the signal transceiver of the smoke sensor module 2 may be integrated, where the housing assembly is one, the signal transceiver is disposed in the housing assembly, and the housing assembly is communicated with the air outlet end of the positive pressure gas generating assembly 31 through an air pipe.

In this embodiment, the positive pressure gas generating component 31 may be an air pump, and in other embodiments, the positive pressure gas generating component 31 may be a blower, etc., which is not limited herein.

Preferably, the air inlet end of the positive pressure gas generating component 31 is communicated with the outside of the range hood, so that the positive pressure gas flow entering the shell component is ensured to be clean, the phenomenon that the surface of the signal receiving and transmitting component deposits oil smoke due to the fact that the oil smoke is carried in the positive pressure gas flow is avoided, and the accurate detection result of the smoke sensing module 2 can be further ensured to be maintained under long-time use. It will be appreciated that the air inlet end of the positive pressure gas generating assembly 31 may be directly connected to the exterior of the range hood, or may be communicated with the exterior of the range hood through other channel pitches, which is not particularly limited herein. Alternatively, as shown in fig. 2, the positive pressure gas generating assembly 31 is disposed outside the smoke collecting chamber so that the gas inlet end of the positive pressure gas generating assembly 31 communicates with the outside of the range hood. In other embodiments, the positive pressure gas generating assembly 31 may be disposed inside the smoke collecting cavity, and the air inlet end of the positive pressure gas generating assembly 31 is communicated with the outside of the range hood through the communicating pipe.

Preferably, as shown in fig. 3, the first housing 21 is provided with a first air inlet 211, the first air pipe 321 is connected to the first air inlet 211, the first air inlet 211 is opposite to the opening 23 on the first housing 21, and by aligning the air inlet flow direction of the first housing 21 with the opening 23 on the first housing 21, the oil smoke can be prevented from entering the first housing 21 from the opening 23. Similarly, the second air inlet 221 is disposed on the second housing 22, the second air pipe 322 is connected to the second air inlet 221, the second air inlet 221 is disposed opposite to the opening 23 on the second housing 22, and the direction of the air inlet flow of the second housing 22 is aligned with the opening 23 on the second housing 22, so that the oil smoke can be prevented from entering the second housing 22 from the opening 23.

Preferably, as shown in fig. 3, the smoke sensing module 2 further includes a mounting bracket 24, the mounting bracket 24 is connected to the smoke collecting hood 12, and the first housing 21 and the second housing 22 are mounted on the mounting bracket 24. Through setting up installing support 24, make first shell 21 and second shell 22 all regard installing support 24 as the installation benchmark, be favorable to guaranteeing the relative position precision of signal receiving terminal and signal transmitting terminal, and then guarantee the accuracy of smoke sense module 2 testing result. In this embodiment, the mounting bracket 24 may be secured to the hood 12 by fasteners such as screws or bolts.

In this embodiment, as shown in fig. 3, the first housing 21 includes a first body portion 214 and a first plug portion 212, the signal transmitting end is disposed in the first body portion 214, the opening 23 and the first air inlet 211 on the first housing 21 are both disposed on the first body portion 214, and the first plug portion 212 is connected to the first body portion 214. The second housing 22 includes a second body 224 and a second plug portion 222, the signal receiving end is disposed in the second body 224, the opening 23 and the second air inlet 221 on the second housing 22 are disposed on the second body 224, and the second plug portion 222 is connected to the second body 224. Preferably, as shown in fig. 4, the mounting bracket 24 is provided with a first inserting groove 241 and a second inserting groove 242, the first inserting portion 212 is inserted into the first inserting groove 241, and the second inserting portion 222 is inserted into the second inserting groove 242, so that the first casing 21 and the second casing 22 are respectively connected with the mounting bracket 24, in this embodiment, the first inserting portion 212 and the second inserting portion 222 are both in cylindrical structures, and correspondingly, the cross sections of the first inserting groove 241 and the second inserting groove 242 are all circular, so that the inserting process of the first inserting portion 212 and the second inserting portion 222 is ensured to be smoother.

Preferably, as shown in fig. 3 and 4, the first housing 21 further includes a first mounting protrusion 213, the first mounting protrusion 213 being disposed on the first socket 212, and the second housing 22 further includes a second mounting protrusion 223, the second mounting protrusion 223 being disposed on the second socket 222. The mounting bracket 24 is provided with a first positioning groove 243 at one side of the first inserting groove 241, the first mounting protrusion 213 is limited in the first positioning groove 243, the mounting bracket 24 is provided with a second positioning groove 244 at one side of the second inserting groove 242, and the second mounting protrusion 223 is limited in the second positioning groove 244. Through the cooperation of the first mounting protrusion 213 and the first positioning groove 243, the fool-proofing effect can be achieved when the first housing 21 is mounted, and the mounting angle of the first housing 21 relative to the mounting bracket 24 is ensured to be accurate. Through the cooperation of the second mounting protrusion 223 and the second positioning groove 244, the fool-proof effect can be achieved when the second housing 22 is mounted, and the accuracy of the mounting angle of the second housing 22 relative to the mounting bracket 24 is ensured.

Preferably, the first mounting protrusion 213 is fixedly connected with the mounting bracket 24 by a fastener, thereby securing the connection of the first housing 21 with the mounting bracket 24. The second mounting protrusion 223 is also fixedly connected with the mounting bracket 24 by a fastener, thereby securing the connection of the second housing 22 with the mounting bracket 24. In particular, the fastener herein may be a screw or a bolt, which is not particularly limited herein.

In this embodiment, the first plugging portion 212 is a cylindrical structure with an open lower end, when the first plugging portion 212 is plugged into the first plugging groove 241, the bottom plate of the first plugging groove 241 can realize plugging of the open end of the first plugging portion 212, so as to realize sealing of the first housing 21, and prevent oil smoke from entering the first housing 21 from the open end. Similarly, the second plugging portion 222 is a cylindrical structure with an open lower end, and when the second plugging portion 222 is plugged into the second plugging groove 242, the bottom plate of the second plugging groove 242 can block the opening of the second plugging portion 222, so that the second housing 22 is sealed, and oil smoke is prevented from entering the second housing 22 from the opening position. Preferably, as shown in fig. 4, a first sealing rib 245 is further disposed in the first plugging groove 241, and the first sealing rib 245 abuts against the inner wall of the first plugging portion 212, so that the sealing of the mounting bracket 24 to the opening of the first plugging portion 212 is further improved. Likewise, a second sealing rib 246 is further disposed in the second socket groove 242, and the second sealing rib 246 abuts against the inner wall of the second socket portion 222, thereby further improving the sealing of the mounting bracket 24 to the opening of the second socket portion 222.

In this embodiment, the smoke sensor module 2 further includes a first wire and a second wire (not shown), the first wire is used for electrical connection and signal transmission between the signal transmitting end and the control module of the range hood, and the second wire is used for electrical connection and signal transmission between the signal receiving end and the control module of the range hood.

Preferably, as shown in fig. 5, a first wire outlet hole 247 is formed at the bottom of the first plugging slot 241, one end of a first wire is connected with the signal transmitting end, the other end sequentially penetrates through the first plugging portion 212 and the first wire outlet hole 247 and then extends between the mounting bracket 24 and the fume collecting hood 12, a second wire outlet hole 248 is formed at the bottom of the second plugging slot 242, one end of the second wire is connected with the signal receiving end, and the other end sequentially penetrates through the second plugging portion 222 and the second wire outlet hole 248 and then extends between the mounting bracket 24 and the fume collecting hood 12. The first wire and the second wire are conveniently led out of the first shell 21 and the second shell 22 by arranging the first wire hole 247 and the second wire hole 248, and the structure in the smoke collecting cavity is more regular by pressing the first wire and the second wire between the mounting bracket 24 and the smoke collecting cover 12, so that the resistance to the airflow in the smoke collecting cavity can be reduced, and the deposition of oil smoke on the surfaces of the first wire and the second wire can be avoided.

Preferably, as shown in fig. 5, a wire guiding groove 249 is arranged on one side of the mounting bracket 24 facing the fume collecting hood 12, the wire guiding groove 249 is used for accommodating and limiting the first wire and the second wire, a wire outlet 250 is arranged on the side wall of the wire guiding groove 249, the first wire and the second wire can be arranged outside the mounting bracket 24 from the wire outlet 250, the first wire and the second wire can be limited and fixed through the wire guiding groove 249, and shaking and abrasion of the first wire and the second wire are avoided. It will be appreciated that the specific location of the outlet 250 may be flexibly set as desired, and is not specifically limited herein.

It is to be understood that the foregoing examples of the utility model are provided for the purpose of illustration only and are not intended to limit the scope of the utility model, which is defined by the claims, since modifications in both the detailed description and the application scope of the utility model will become apparent to those skilled in the art upon consideration of the teachings of the utility model. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A range hood, comprising:

a smoke collecting hood (12) for forming a smoke collecting cavity;

the smoke sensing module (2) is arranged in the smoke collecting cavity, the smoke sensing module (2) comprises a shell component and a signal receiving and transmitting component, the signal receiving and transmitting component is arranged in the shell component, an opening (23) is formed in the shell component, the opening (23) is used for allowing a signal to pass through, and the signal receiving and transmitting component can detect the concentration of oil smoke in the smoke collecting cavity;

the blowing mechanism (3) comprises a positive pressure gas generating assembly (31) and an air pipe assembly (32), wherein the positive pressure gas generating assembly (31) is used for generating positive pressure gas flow, and the air outlet end of the positive pressure gas generating assembly (31) is communicated with the inside of the shell assembly through the air pipe assembly (32) so as to blow air into the shell assembly.

2. A range hood according to claim 1, characterized in that the housing assembly comprises a first housing (21) and a second housing (22), the first housing (21) and the second housing (22) each being provided with an opening (23);

the signal receiving and transmitting assembly comprises a signal transmitting end and a signal receiving end, the signal transmitting end is arranged in the first shell (21), and the signal receiving end is arranged in the second shell (22);

the air pipe assembly (32) comprises a first air pipe (321) and a second air pipe (322), the first air pipe (321) is communicated with the air outlet end of the positive pressure air generating assembly (31) and the interior of the first shell (21), and the second air pipe (322) is communicated with the air outlet end of the positive pressure air generating assembly (31) and the interior of the second shell (22).

3. The range hood according to claim 2, characterized in that a first air inlet (211) is provided on the first housing (21), the first air pipe (321) is connected to the first air inlet (211), and the first air inlet (211) is arranged opposite to the opening (23) on the first housing (21); and/or

The second shell (22) is provided with a second air inlet (221), the second air pipe (322) is connected to the second air inlet (221), and the second air inlet (221) is opposite to the opening (23) in the second shell (22).

4. The range hood according to claim 2, wherein the smoke sensing module (2) further comprises a mounting bracket (24), the mounting bracket (24) is connected with the smoke collecting hood (12), and the first housing (21) and the second housing (22) are both mounted on the mounting bracket (24).

5. The range hood according to claim 4, wherein the first housing (21) comprises a first plugging portion (212), the second housing (22) comprises a second plugging portion (222), a first plugging groove (241) and a second plugging groove (242) are arranged on the mounting bracket (24), the first plugging portion (212) is plugged in the first plugging groove (241), and the second plugging portion (222) is plugged in the second plugging groove (242).

6. The range hood according to claim 5, wherein the first housing (21) further comprises a first mounting protrusion (213), the first mounting protrusion (213) being arranged on the first plug section (212), the second housing (22) further comprises a second mounting protrusion (223), the second mounting protrusion (223) being arranged on the second plug section (222);

the mounting bracket (24) is provided with a first positioning groove (243) at one side of the first inserting groove (241), the first mounting protrusion (213) is limited in the first positioning groove (243), the mounting bracket (24) is provided with a second positioning groove (244) at one side of the second inserting groove (242), and the second mounting protrusion (223) is limited in the second positioning groove (244).

7. The range hood according to claim 5, wherein the smoke sensing module (2) further comprises a first wire and a second wire, a first wire outlet hole (247) is formed in the bottom of the first inserting groove (241), one end of the first wire is connected with the signal transmitting end, and the other end of the first wire sequentially penetrates through the first inserting portion (212) and the first wire outlet hole (247) and then stretches into the space between the mounting bracket (24) and the smoke collecting hood (12);

the bottom of second grafting groove (242) is provided with second wire hole (248), second wire one end with signal receiving end is connected, and the other end wears to establish in proper order second grafting portion (222) with second wire hole (248) back stretches into between installing support (24) and collection petticoat pipe (12).

8. The range hood according to claim 7, wherein a wire guiding groove (249) is arranged on one side of the mounting bracket (24) facing the fume collecting hood (12), the wire guiding groove (249) is used for accommodating and limiting the first wire and the second wire, a wire outlet (250) is arranged on the side wall of the wire guiding groove (249), and the first wire and the second wire stretch out and draw back from the wire outlet (250) to the outside of the mounting bracket (24).

9. The range hood according to any one of claims 1-8, wherein the air inlet end of the positive pressure gas generating assembly (31) communicates with the exterior of the range hood.

10. The range hood according to any one of claims 1 to 8, wherein the positive pressure gas generating assembly (31) is arranged outside the fume collecting chamber; or (b)

The positive pressure gas generating assembly (31) is arranged inside the smoke collecting cavity, and the air inlet end of the positive pressure gas generating assembly (31) is communicated with the outside of the range hood through a communicating pipe.