PM2.5 detection device and extractor hood thereof

Abstract

The utility model discloses a PM2.5 (Particulate Matter 2.5) detection device, which comprises a box body component, an inner closed cavity and an outer closed cavity positioned on the periphery of the inner closed cavity are formed in the box body component, and a detection port communicated with the inner closed cavity is formed at the bottom of the box body component; and the PM2.5 assembly is mounted in the inner closed cavity. The PM2.5 detection device disclosed by the utility model is simple in structure, forms multiple protection on the PM2.5 component, and effectively prevents oil stains from entering the box body component to damage the PM2.5 component. The utility model further provides the range hood.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a PM2.5 detection device and a range hood thereof. Background Art

[0002] Existing range hoods automatically turn on or adjust the working gear by detecting the concentration of PM2.5 to quickly exhaust harmful air and keep the kitchen space clean. In order not to affect the appearance of the whole machine, the PM2.5 detection device is installed inside the range hood and is in the oil circuit environment.

[0003] However, existing PM2.5 detection devices are basically single-layer plastic boxes, which are only sealed by buttons. The plastic box structure is too simple, and the sealing structure has only one layer of protection, and the oil-proof effect is poor. There is still a situation where the PM2.5 detection device is damaged after oil pollution enters. Summary of the invention

[0004] The utility model aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the utility model proposes a PM2.5 detection device with a simple structure, multiple protections for protecting PM2.5 components, and effectively preventing oil and dirt from entering the box body component and damaging the PM2.5 components. The utility model also provides a range hood.

[0005] According to the PM2.5 detection device provided above, it is implemented through the following technical solutions:

[0006] A PM2.5 detection device comprises: a box body assembly, wherein an inner sealed cavity and an outer sealed cavity located outside the inner sealed cavity are formed inside the box body assembly, and a detection port connected to the inner sealed cavity is opened at the bottom of the box body assembly; and a PM2.5 component installed in the inner sealed cavity.

[0007] In some embodiments, a wire hole is provided in the cavity wall of the inner sealed cavity, and a wire outlet and an oil drain port are provided in the rear cavity wall of the outer sealed cavity.

[0008] In some embodiments, a peripheral edge extending upward and located at the periphery of the inner sealed cavity is provided on the bottom surface of the outer sealed cavity, and a gap is left between the top of the peripheral edge and the top surface of the outer sealed cavity.

[0009] In some embodiments, an oil outlet is provided at the rear end of the surrounding edge.

[0010] In some embodiments, the surrounding edge includes a front oil guiding edge, a rear oil guiding edge, and two relatively arranged side oil guiding edges in an inverted "V" shape, the front oil guiding edge and the rear oil guiding edge are respectively located at the front and rear outer sides of the inner closed cavity, the two side oil guiding edges are respectively located at the left and right outer sides of the inner closed cavity, the upper end of each side oil guiding edge is fixedly connected to the front oil guiding edge, and the lower end is fixedly connected or loosely fitted with the rear oil guiding edge.

[0011] In some embodiments, the rear oil guiding edge and at least one of the side oil guiding edges are arranged to be inclined from front to back and in a direction away from the inner closed cavity.

[0012] In some embodiments, a positioning structure is provided between the PM2.5 component and the bottom surface of the inner sealed cavity; and / or a filter cotton is sandwiched between the PM2.5 component and the bottom surface of the inner sealed cavity, and the filter cotton covers the detection port.

[0013] In some embodiments, at least two annular ribs extending downward and located at the periphery of the detection port are provided at the bottom of the box body assembly, an annular groove opening downward is formed between adjacent annular ribs, and an annular groove opening downward is formed between the detection port and the annular rib arranged near the detection port.

[0014] In some embodiments, a seal is embedded in at least one of the annular grooves.

[0015] In some embodiments, the box body assembly includes a base box and an outer cover, the base box having an inner concave cavity opening upward and an outer concave cavity opening upward and located outside the inner concave cavity, and a detection port is opened at a position on the bottom of the base box corresponding to the inner concave cavity; the outer cover is arranged outside the base box and is detachably connected to the base box, the inner concave cavity and the outer cover are enclosed to form the inner sealed cavity, and the outer concave cavity and the outer cover are enclosed to form the outer sealed cavity.

[0016] In some embodiments, an inner cover is provided between the base box and the outer cover and is arranged outside the inner concave cavity. The inner cover is pressed against the top of the cavity wall of the inner concave cavity by the outer cover, or the inner cover is detachably connected to the base box and / or the outer cover, and the inner concave cavity and the inner cover are enclosed to form the inner closed cavity.

[0017] In some embodiments, a downwardly extending protrusion and / or a limiting portion is provided at a position on the top of the outer cover corresponding to the inner cover, the protrusion is located on the top of the inner cover and presses the inner cover tightly against the top of the cavity wall of the inner concave cavity, and the limiting portion is located on the periphery of the inner cover to limit the displacement of the inner cover.

[0018] According to the range hood provided above, it is implemented through the following technical solutions:

[0019] A range hood comprises: a box body, at the bottom of which is provided an air inlet and a bottom plate located in front of the air inlet, on which is provided an air inlet portion; and a PM2.5 detection device as described above, wherein the PM2.5 detection device is arranged in the box body, the box body assembly covers the air inlet portion and is sealed to the bottom plate, and the detection port is connected to the atmosphere outside the box through the air inlet portion.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] 1. The PM2.5 detection device of the utility model has an inner sealed cavity and an outer sealed cavity located outside the inner sealed cavity formed inside the box body component. The PM2.5 component is installed in the inner sealed cavity. The structure is simple. The box body component forms multiple protections for the PM2.5 component, effectively preventing oil from entering the box body component and damaging the PM2.5 component.

[0022] 2. By providing an oil drain port connected to the outer sealed cavity on the box body assembly, it is convenient to discharge the condensed oil dirt that enters the outer sealed cavity of the box body assembly due to poor sealing out of the box body assembly;

[0023] 3. By setting a surrounding edge between the outer closed cavity and the inner closed cavity inside the box body assembly, once oil smoke enters the outer closed cavity of the box body assembly, the surrounding edge can condense this part of the oil smoke to form oil stains, thereby reducing the oil smoke entering between the surrounding edge and the inner closed cavity to a certain extent; secondly, it can guide the condensed oil stains formed in the outer closed cavity, thereby facilitating the drainage of the oil stains to the set position and then discharging them out of the box body assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a PM2.5 detection device in an embodiment of the utility model;

[0025] Figure 2 is a cross-sectional view of a PM2.5 detection device in an embodiment of the present utility model;

[0026] Figure 3 It is an exploded view of the PM2.5 detection device in the embodiment of the utility model;

[0027] Figure 4 is a cross-sectional view of a box assembly in an embodiment of the utility model;

[0028] Figure 5 It is a structural schematic diagram of the bottom box in the embodiment of the utility model;

[0029] Figure 6It is a schematic diagram of the structure of the outer cover in the embodiment of the utility model;

[0030] Figure 7 It is a structural schematic diagram of a range hood in an embodiment of the utility model;

[0031] Figure 8 It is a cross-sectional view of the range hood in the embodiment of the utility model.

[0032] In the figure: 1-box body assembly, 101-inner sealed cavity, 1011-detection port, 1012-wire hole, 1013-installation groove, 1014-positioning column, 102-outer sealed cavity, 1021-wire outlet, 1022-oil drain port, 103-surrounding edge, 1031-oil outlet, 104-annular convex rib, 105-annular groove, 11-bottom box, 111-inner concave cavity, 112-outer concave cavity, 1121-inverted buckle, 1122-lower notch, 12-12-outer cover, 121-engaging hole, 122-raised portion, 123-limiting portion, 13-inner cover; 2-PM2.5 assembly, 21-positioning platform; 3-filter cotton; 4-seal; 5-box body, 51-air inlet, 52-bottom plate, 521-air inlet. DETAILED DESCRIPTION

[0033] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific implementation of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed for protection in the present invention.

[0034] Example 1

[0035] refer to Figure 1-3 This embodiment provides a PM2.5 detection device, which is applied to a range hood. The device includes a box body component 1 and a PM2.5 component 2. An inner sealed cavity 101 and an outer sealed cavity 102 located outside the inner sealed cavity 101 are formed inside the box body component 1, wherein the outer sealed cavity 102 serves as a first layer (outer layer) sealing structure, and the inner sealed cavity 101 serves as a second layer (inner layer) sealing structure.

[0036] A detection port 1011 connected to the inner sealed cavity 101 is provided at the bottom of the box body component 1. In this embodiment, the detection port 1011 includes two detection channels arranged at intervals to increase the area and number of the detection channels. The PM2.5 component 2 is installed in the inner sealed cavity 101 and is sealed to the edge of the detection port 1011. In this way, the PM2.5 component 2 is wrapped inside the inner sealed cavity 101, and the box body component 1 forms multiple protections for protecting the PM2.5 component 2, effectively preventing oil from entering the box body component 1 and damaging the PM2.5 component.

[0037] When the PM2.5 detection device is fixedly installed inside the housing 5 of the range hood, see Figure 7-8 At this time, the device is in an oil circuit environment. Since the PM2.5 component 2 is wrapped in the inner sealed chamber 101 of the box body component 1, even if some of the oil smoke in the box body 5 enters the outer sealed chamber 102 of the box body component 1, this part of the oil smoke cannot enter the inner sealed chamber 1012, thereby effectively preventing oil from entering the inner sealed chamber 101 and damaging the PM2.5 component, thereby ensuring the integrity of the PM2.5 component function to the greatest extent.

[0038] Specifically, a wire hole 1012 is provided on the cavity wall of the inner sealed cavity 101. In this embodiment, the wire hole 1012 is provided on the left cavity wall of the inner sealed cavity 101, and the outer sealed cavity 102 is connected to the inner sealed cavity 101 through the wire hole 1012. A wire outlet 1021 connected to the outer sealed cavity 102 is provided on the rear cavity wall of the outer sealed cavity 102, so that it is convenient to pass the wire connected to the PM2.5 component through the wire hole 1012 and the wire outlet 1021 in sequence, and pass it out of the box body component 1 for power connection or connect to the main controller of the range hood. In addition, an oil discharge port 1022 connected to the outer sealed chamber 102 is provided on the rear cavity wall of the outer sealed chamber 102. In this way, even if smoke oil enters the outer sealed chamber 102 of the box body assembly 1 from the box body 5 to form condensed oil, this part of the condensed oil can be discharged outside the box body assembly 1 through the oil discharge port 1022 to avoid the condensed oil from being deposited in the box body assembly 1.

[0039] refer to Figure 1-6 Furthermore, a peripheral edge 103 extending upward and located outside the inner sealed cavity 101 is integrally formed on the bottom surface of the outer sealed cavity 102, and a gap is left between the top of the peripheral edge 103 and the top surface of the outer sealed cavity 102, and the gap is used for the wire connecting the PM2.5 component to pass through. Therefore, when smoke oil enters the outer sealed cavity 102 of the box body assembly 1 from the box body 5, the setting of the peripheral edge 103 can, on the one hand, enable this part of the smoke to condense on the peripheral edge to form oil stains, and to a certain extent reduce the amount of oil smoke entering between the peripheral edge and the inner sealed cavity, and on the other hand, guide the condensed oil stains formed in the outer sealed cavity, so as to facilitate the drainage of the oil stains to the set position. In this embodiment, the peripheral edge 103 is used to drain the oil stains to the rear cavity wall of the outer sealed cavity 102, and then discharge them out of the box body assembly 1 through the oil discharge port 1022.

[0040] Specifically, an oil outlet 1031 is provided at the rear end of the surrounding edge 103 to discharge the oil between the surrounding edge 103 and the inner closed cavity 101 out of the surrounding edge 103. In this embodiment, the oil outlet 1031 is arranged close to the oil drain port 1022 to reduce the distance between the two, so that the oil discharged from the oil outlet 1031 is quickly discharged from the oil drain port 1022 to the outside of the box body assembly 1, and the residence time of the oil discharged from the oil outlet 1031 in the box body assembly 1 is reduced.

[0041] refer to Figure 5 Specifically, the surrounding edge 103 includes a front oil guiding edge, a rear oil guiding edge, and two side oil guiding edges arranged oppositely, and the front oil guiding edge and the rear oil guiding edge are respectively located at the front and rear outer sides of the inner sealed cavity 101. The two side oil guiding edges are respectively located at the left and right outer sides of the inner sealed cavity 101, and the upper ends of the two side oil guiding edges are respectively fixedly connected to the left and right ends of the front oil guiding edge, the lower end of the side oil guiding edge arranged on the left is fixedly connected to the left end of the rear oil guiding edge, and the lower end of the side oil guiding edge arranged on the right is gap-matched with the right end of the rear oil guiding edge, and the gap constitutes the oil outlet 1031. Of course, the lower end of the side oil guiding edge arranged on the left can also be designed to be gap-matched with the rear oil guiding edge. In this case, the left end of the rear oil guiding edge needs to be lengthened accordingly, so that the left end of the rear oil guiding edge can receive the oil stains flowing down from the side oil guiding edge arranged on the left, and then drain this part of the oil stains to the oil outlet 1031.

[0042] In this embodiment, the front oil guide edge is in an inverted "V" shape, which is used to divert the oil flowing through it and guide it to the two side oil guide edges. The side oil guide edge arranged on the right is arranged from front to back and tilted in the direction away from the inner closed cavity 101, and the lower end of the side oil guide edge arranged on the right is arranged toward the oil drain port 1022, so as to quickly guide the oil flowing through it to the oil drain port 1022. The rear oil guide edges are all arranged from front to back and tilted in the direction away from the inner closed cavity 101, and the end of the rear oil guide edge close to the oil outlet 1031 is arranged close to the oil drain port 1022, so as to quickly guide the oil passing through it to the oil drain port 1022.

[0043] refer to Figure 2-5 Furthermore, a positioning structure is provided between the PM2.5 component 2 and the bottom surface of the inner sealed cavity 101 to realize rapid positioning of the installation of the PM2.5 component. In this embodiment, the positioning structure includes a positioning column 1014 and a positioning platform 21. A positioning column 1014 extending upward is integrally formed on the bottom surface of the inner sealed cavity 101. The positioning column 1014 is arranged near the rear right corner of the inner sealed cavity 101. Correspondingly, a positioning platform 21 is formed at the position of the PM2.5 component corresponding to the positioning column 1014. The positioning platform 21 is provided with an opening for the positioning column to pass through. During installation, the positioning platform 21 of the PM2.5 component is sleeved outside the positioning column 1014.

[0044] refer to Figure 1-3, further, the device also includes filter cotton 3, which is preferably a filter sponge, and of course can also be an oil-absorbing cotton that allows smoke to pass through. When installed, the filter cotton 3 is sandwiched between the bottom of the PM2.5 component 2 and the bottom surface of the inner closed cavity 101 and covers the detection port 1011. The PM2.5 component 2 is sealed and connected to the edge of the detection port 1011 through the filter cotton 3. In this way, the filter cotton 3 can filter the smoke flowing through it, effectively preventing oil from entering the inner closed cavity 101 through the detection port 1011 and interfering with the PM2.5 component. In this embodiment, a downwardly concave installation groove 1013 is provided on the bottom surface of the inner closed cavity 101, and a detection port 1011 is opened on the bottom surface of the installation groove 1013. The detection port 1011 is connected to the inner closed cavity 101 through the installation groove, and the filter cotton 3 is embedded in the installation groove and covers two detection ports 1011 at the same time. The PM2.5 component 2 is sealed and connected to the bottom surface of the installation groove through the filter cotton 3.

[0045] refer to Figure 1-5 Furthermore, the device also includes a sealing member 4. At least two annular ribs 104 extending downward and located at the periphery of the detection port 1011 are integrally formed at the bottom of the box body assembly 1. All the annular ribs 104 are arranged at intervals in the radial direction. An annular groove 105 opening downward is formed between adjacent annular ribs 104. An annular groove 105 opening downward is formed between the detection port 1011 and the annular rib 104 arranged near the detection port 1011. A sealing member 4 is embedded in at least one annular groove 105. In this embodiment, the number of annular ribs 104 is three, and the annular groove arranged near the detection port 1011 is embedded with a seal 4, and the remaining annular grooves are used as glue grooves. In this way, when the device is adhered to the case 5 of the oil suction hood through PUR glue, the bonding connection of the device is more firm and reliable. At this time, the seal 4 is pressed between the box body assembly 1 and the box body 5, which can prevent the condensed oil inside the box body 51 from flowing through the glue gap to the detection port 1011 and being sucked into the inner closed cavity 101 of the box body assembly 1.

[0046] refer to Figure 3-5In this embodiment, the box assembly 1 includes a bottom box 11 and an outer cover 12. The bottom box 11 has an inner concave cavity 111 opening upward and an outer concave cavity 112 opening upward and located at the periphery of the inner concave cavity 111. The cavity wall of the inner concave cavity 111 constitutes an inner annular wall, and a wire hole 1012 is provided on the left side of the inner annular wall. The cavity wall of the outer concave cavity 112 constitutes an outer annular wall, the height of which is lower than the height of the inner annular wall. A plurality of undercuts 1121 arranged at intervals in the circumferential direction are provided on the outer surface of the outer annular wall, and a lower notch 1122 for oil dirt to pass through is provided at the rear of the inner annular wall. In addition, a detection port 1011 is provided at a position corresponding to the inner concave cavity 111 at the bottom of the bottom box 11, and an upwardly extending peripheral edge 103 is integrally formed on the inner surface of the bottom of the bottom box 11. The peripheral edge 103 is located between the inner concave cavity 111 and the outer concave cavity 112, and the height of the peripheral edge 103 is slightly lower than the height of the outer annular wall.

[0047] The outer cover 12 is disposed on the outside of the bottom box 11 from top to bottom and is detachably connected to the bottom box 11. The inner concave cavity 111 and the outer cover 12 are enclosed to form an inner sealed cavity 101, and the outer concave cavity 112 and the outer cover 12 are enclosed to form an outer sealed cavity 102. Specifically, the outer cover 12 is detachably connected to the bottom box 11 through a snap-fit ​​structure, and the snap-fit ​​structure includes a snap-fit ​​hole 121 and an undercut 1121. A plurality of snap-fit ​​holes 121 are concavely provided on the inner surface of the peripheral wall of the outer cover 12 at circumferential intervals, see Figure 6 Correspondingly, the outer surface of the cavity wall of the outer concave cavity 112 is provided with undercuts 1121 arranged one-to-one corresponding to the snap-fit ​​holes. By cooperating with the snap-fit ​​holes, the outer cover 12 and the bottom box 11 are snapped and fixed to form a whole.

[0048] In this embodiment, the box assembly 1 further includes an inner cover 13, and the inner cover 13 is provided between the bottom box 11 and the outer cover 12 and is arranged outside the inner concave cavity 111. The inner cover 13 is pressed against the top of the cavity wall of the inner concave cavity 111 by the outer cover 12, so that the inner cover 13 is sealed and connected with the top of the cavity wall of the inner concave cavity 111. At this time, the inner concave cavity 111 and the inner cover 13 are enclosed to form an inner closed cavity 101. In other embodiments, the inner cover 13 can be designed to be detachably connected with the bottom box 11 and / or the outer cover 12. Of course, the inner cover 13 can also be omitted. When the inner cover 13 is omitted, the cavity wall of the inner concave cavity 111 needs to be raised, that is, the cavity wall of the inner concave cavity 111 is extended upward to be sealed and connected with the top of the outer cover 12.

[0049] Specifically, a downwardly extending protrusion 122 and / or a limiting portion 123 are integrally formed at a position on the lower surface of the top of the outer cover 12 corresponding to the inner cover 13. The protrusion 122 is preferably a reinforcing rib, which is located at the top of the inner cover 13 and presses the inner cover 13 tightly against the top of the cavity wall of the inner concave cavity 111, so that the inner cover 13 seals the inner concave cavity 111 and prevents oil smoke from entering the inner sealed cavity 101 from the outer closed cavity 102. The limiting portion 123 is located at the periphery of the inner cover 13 and is used to limit the displacement of the inner cover 13. In this embodiment, the limiting portion 123 includes three limiting edges arranged at intervals in the circumferential direction, two of which are in the shape of a "7" and are used to limit the inner cover 13 to the left and right and the front, and the other limiting edge is in the shape of a "I" and is used to limit the inner cover 13 to the rear.

[0050] Example 2

[0051] refer to Figure 7-8 This embodiment provides a range hood, which includes a box body 5 and a PM2.5 detection device as described in Example 1. An air inlet 51 and a bottom plate 52 located in front of the air inlet 51 are provided at the bottom of the box body 5. In this embodiment, the bottom plate 52 is arranged from front to back and tilted downward, and an air inlet 521 is provided on the bottom plate 52. The PM2.5 detection device is arranged in the box body 5, the box body assembly 1 covers the air inlet 521 and is sealed and connected to the bottom plate 52 through a seal 4, and the detection port 1011 is connected to the atmosphere outside the box body 5 through the air inlet 521, so that the PM2.5 component inside the box body assembly 1 can detect the PM2.5 concentration outside the box body 5.

[0052] Since the bottom plate 52 is arranged from front to back and tilted downward, the entire PM2.5 detection device is also arranged from front to back and tilted downward. In this way, the box body assembly 1 has a certain tilt angle, which is more convenient for oil guidance, so that the oil stains entering the box body assembly 1 can be quickly discharged out of the box body assembly 1.

[0053] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A PM2.5 detection device, characterized in that: include: A box body component (1), wherein an inner sealed cavity (101) and an outer sealed cavity (102) located outside the inner sealed cavity (101) are formed inside the box body component (1), and a detection port (1011) connected to the inner sealed cavity (101) is opened at the bottom of the box body component (1); The PM2.5 component (2) is installed in the inner sealed chamber (101).

2. According to the PM2.5 detection device according to claim 1, a wire hole (1012) is provided on the cavity wall of the inner closed cavity (101), and a wire outlet (1021) and an oil drain port (1022) are provided on the rear cavity wall of the outer closed cavity (102).

3. A PM2.5 detection device according to claim 1, characterized in that: A peripheral edge (103) extending upward and located at the periphery of the inner sealed cavity (101) is provided on the bottom surface of the outer sealed cavity (102), and a gap is left between the top of the peripheral edge (103) and the top surface of the outer sealed cavity (102).

4. A PM2.5 detection device according to claim 3, characterized in that: An oil outlet (1031) is provided at the rear end of the surrounding edge (103).

5. A PM2.5 detection device according to claim 3, characterized in that: The surrounding edge (103) comprises a front oil guiding edge, a rear oil guiding edge and two side oil guiding edges arranged opposite to each other in an inverted "V" shape; the front oil guiding edge and the rear oil guiding edge are respectively located at the front and rear outer sides of the inner sealed cavity (101); the two side oil guiding edges are respectively located at the left and right outer sides of the inner sealed cavity (101); the upper end of each side oil guiding edge is fixedly connected to the front oil guiding edge, and the lower end is fixedly connected or loosely fitted with the rear oil guiding edge.

6. A PM2.5 detection device according to claim 5, characterized in that: The rear oil guiding edge and at least one of the side oil guiding edges are arranged in an inclined manner from front to back and in a direction away from the inner sealed cavity (101).

7. A PM2.5 detection device according to claim 1, characterized in that: A positioning structure is provided between the PM2.5 component (2) and the bottom surface of the inner sealed cavity (101); and / or a filter cotton (3) is sandwiched between the PM2.5 component (2) and the bottom surface of the inner sealed cavity (101), and the filter cotton (3) covers the detection port (1011).

8. A PM2.5 detection device according to claim 1, characterized in that: At least two annular convex ribs (104) extending downward and located at the periphery of the detection port (1011) are provided at the bottom of the box body assembly (1), an annular groove (105) opening downward is formed between adjacent annular convex ribs (104), and an annular groove (105) opening downward is formed between the detection port (1011) and the annular convex rib (104) arranged adjacent thereto.

9. A PM2.5 detection device according to claim 8, characterized in that: A sealing element (4) is embedded in at least one of the annular grooves (105).

10. A PM2.5 detection device according to any one of claims 1 to 9, characterized in that: The box body assembly (1) comprises a bottom box (11) and an outer cover (12); the bottom box (11) comprises an inner concave cavity (111) opening upwards and an outer concave cavity (112) opening upwards and located at the periphery of the inner concave cavity (111); a detection port (1011) is provided at a position corresponding to the inner concave cavity (111) at the bottom of the bottom box (11); the outer cover (12) is arranged outside the bottom box (11) and is detachably connected to the bottom box (11); the inner concave cavity (111) and the outer cover (12) are enclosed to form the inner sealed cavity (101); and the outer concave cavity (112) and the outer cover (12) are enclosed to form the outer sealed cavity (102).

11. A PM2.5 detection device according to claim 10, characterized in that: An inner cover (13) is provided between the base box (11) and the outer cover (12) and is arranged outside the inner concave cavity (111); the inner cover (13) is pressed against the top of the cavity wall of the inner concave cavity (111) by the outer cover (12); or the inner cover (13) is detachably connected to the base box (11) and / or the outer cover (12); the inner concave cavity (111) and the inner cover (13) are enclosed to form the inner sealed cavity (101).

12. A PM2.5 detection device according to claim 11, characterized in that: A downwardly extending raised portion (122) and / or a limiting portion (123) is provided at a position on the top of the outer cover (12) corresponding to the inner cover (13); the raised portion (122) is located on the top of the inner cover (13) and presses the inner cover (13) tightly against the top of the cavity wall of the inner cavity (111); and the limiting portion (123) is located on the periphery of the inner cover (13) and is used to limit the displacement of the inner cover (13).

13. A range hood, characterized in that: include: A box body (5), wherein an air inlet (51) and a bottom plate (52) located in front of the air inlet (51) are provided at the bottom of the box body (5), and an air inlet portion (521) is provided on the bottom plate (52); A PM2.5 detection device according to any one of claims 1 to 12, wherein the PM2.5 detection device is arranged in the box (5), the box body assembly (1) covers the air inlet portion (521) and is sealed to the bottom plate (52), and the detection port (1011) is connected to the atmosphere outside the box (5) through the air inlet portion (521).

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