CN216557273U - Fume exhaust fan - Google Patents

Abstract

The utility model relates to a range hood, which comprises a body with an oil smoke channel, a fan system and an oil smoke filtering system, wherein the fan system and the oil smoke filtering system are arranged in the oil smoke channel; the first-stage filtering unit comprises a plurality of filtering plates which are arranged along the span direction of the oil smoke channel inlet, and the filtering plates extend along the airflow flowing direction; the second-stage filtering unit is a filtering layer matched with the oil smoke channel. This range hood can avoid running the cigarette problem, can improve the oil smoke filter effect simultaneously.

Description

Fume exhaust fan

Technical Field

The utility model relates to a range hood.

Background

The range hood provides convenience for cooking as an essential kitchen electrical product in a household kitchen, a cooker is far away from cooking oil smoke, the problem of cooking oil smoke is solved by the range hood, but stubborn oil smoke can enter a core component fan system of the range hood through the range hood, an impeller and a volute are polluted, and the fan is difficult to clean. Because the oil smoke has viscidity, the oil smoke can be accumulated more and more, the performance of the fan can be influenced along with long-term use, and the oil smoke is simply discharged outdoors, so that the influence on air can be caused, and the environmental pollution is large. For the filtering problem of the range hood, a more common technical means is to add a filter screen at an air inlet of the range hood for interception, so that the oil smoke collides in the process of contacting the filter screen to realize the interception of the oil smoke. In order to improve the oil smoke absorption effect, a multi-layer filter screen structure is usually adopted, for example, in chinese patent application publication No. CN112212379A (application No. 202011204976.2) entitled "an oil smoke purification system", in which the disclosed oil smoke separation screen includes an outer layer air screen, a middle layer air screen, and an inner layer air screen, and grids of the outer layer air screen, the middle layer air screen, and the inner layer air screen are arranged in a staggered manner, so as to form a zigzag air duct to improve the filtering effect.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a range hood capable of avoiding the problem of smoke leakage and improving the filtering effect of the smoke.

The technical scheme adopted by the utility model for solving the problems is as follows: the utility model provides a range hood, is including the body that has the oil smoke passageway to and set up fan system, the oil smoke filtration system in the oil smoke passageway, the oil smoke filtration system sets up the upper reaches at fan system, its characterized in that: the oil smoke filtering system comprises a primary filtering unit arranged at the inlet of the oil smoke channel and a secondary filtering unit positioned at the downstream of the primary filtering unit;

the first-stage filtering unit comprises a plurality of filtering plates which are arranged along the span direction of the oil smoke channel inlet, and the filtering plates extend along the airflow flowing direction;

the second-stage filtering unit is a filtering layer matched with the oil smoke channel.

In order to further strengthen the filtering effect of the oil smoke, the condensing and filtering effect of the oil smoke is conveniently strengthened according to the needs, the self-cleaning of the third-stage filtering unit can be carried out according to the needs, and the lower reaches of the second-stage filtering unit in the oil smoke channel are also provided with the third-stage filtering unit which can condense and heat the oil smoke.

Simple structure and conveniently refrigerate or heat work, tertiary filter unit includes at least a set of filtering component and the semiconductor refrigeration piece that corresponds to filtering component setting, filtering component includes many parallel arrangement's tubular metal resonator, the tubular metal resonator matches to stride and establishes in the oil smoke passageway.

In order to improve the filtering effect on the oil smoke, the metal pipes in the filtering component are arranged in a matrix manner, and the metal pipes arranged on different planes are arranged in a staggered manner.

In order to conveniently carry out integral disassembly and assembly operation on the three-stage filtering unit, the three-stage filtering unit further comprises a frame shell matched with the inner peripheral wall of the oil smoke channel, and the filtering component is fixed in the frame shell.

In order to match with the self-cleaning work of the three-stage filtering unit and improve the self-cleaning effect, the three-stage filtering unit also comprises a driving mechanism which can drive the filtering component to vibrate.

In order to conveniently determine the time for carrying out the self-cleaning work of the three-stage filtering unit, the three-stage filtering unit also comprises a weighing sensor for weighing the weight change of the filtering component.

In order to determine a better self-cleaning practice to reduce energy consumption, a temperature sensor is also arranged in the oil smoke channel.

In order to conveniently determine whether to start condensation filtering work of oil smoke and further avoid pollution to a downstream fan, an oil smoke concentration sensor is arranged upstream of the third-stage filtering unit.

In order to facilitate the disassembly and assembly work of the three-stage filtering unit and further facilitate the installation and cleaning work of the three-stage filtering unit, a door body which can be opened and closed is arranged on the body corresponding to the three-stage filtering unit.

In order to increase the oil fume filtering area, the cross section of the filter plate is wavy.

In order to facilitate the cleaning work of the filter plate, the surface of the filter plate is adhered with a coating which can reduce the adhesion capability of oil stains.

Optionally, the coating is a magnetic film or a teflon coating.

In order to respectively perform cleaning treatment on different filtering modules and reduce the cleaning frequency of a primary filtering unit, the primary filtering unit comprises at least two groups of filtering modules arranged along the span direction of an inlet of an oil smoke channel, and adjacent filtering modules are connected through a splicing frame.

In order to facilitate understanding of the oil smoke accumulation condition of each filtering module in the primary filtering unit, the upstream and the downstream of each filtering module in the primary filtering unit are respectively provided with an air volume sensor.

In order to increase the soot filter area, the plane of the filter layer is arranged obliquely to the cross section of the soot channel.

Preferably, the included angle between the plane of the filter layer and the cross section of the oil smoke channel is A, and the range of A is 30-40 degrees.

Optionally, the filter layer is made of foaming sponge or foam metal.

In order to obtain the pollution degree of the secondary filtering unit conveniently, and simultaneously avoid the occurrence of large wind resistance on the basis of ensuring the oil smoke filtering capacity, and further avoid the influence on the performance of the whole machine, the upstream and the downstream of the secondary filtering unit are respectively provided with a wind pressure sensor.

Preferably, the body includes the collection petticoat pipe, locates the fan casing outside the fan system and connects the connection cover between collection petticoat pipe and fan casing, one-level filter unit sets up in the collection petticoat pipe, second grade filter unit sets up the entry end at the connection cover.

In order to reduce the influence of noise generated in the operation of the fan system on a user, the fan system and the fan cover are arranged above a suspended ceiling of an installation space.

Compared with the prior art, the utility model has the advantages that: the range hood improves the filtering capacity of oil smoke through the arrangement of the multistage filtering units, reduces the amount of the oil smoke entering a fan system, further ensures long-term cleanness of the fan and ensures the long-term working reliability of the fan system. The filter plate in one of the first-stage filter system extends along the flowing direction of the air flow, so that the influence of the position of the inlet of the range hood on the amount of the oil smoke entering the oil smoke channel can be effectively avoided, and the problem of oil smoke escape is avoided. Meanwhile, the situation of uncertain movement is generated relative to a basic moving path in the oil smoke moving process, so that the oil smoke filtering effect can be exerted through the primary filtering unit, the oil smoke filtering difficulty of the secondary filtering unit is reduced, and the service cycle of the secondary filtering unit is prolonged.

Drawings

Fig. 1 is a perspective view of a range hood in an embodiment of the present invention.

Fig. 2 is an internal structural view of fig. 1.

Fig. 3 is an exploded perspective view of fig. 1.

Fig. 4 is an exploded perspective view of a primary filter unit in an embodiment of the utility model.

Fig. 5 is an exploded perspective view of a three stage filtration unit in an embodiment of the utility model.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 5, the range hood in this embodiment includes a body 1 having a smoke channel, and a fan system 2 and a smoke filtering system disposed in the smoke channel, wherein the smoke filtering system is disposed upstream of the fan system 2.

Wherein body 1 can adopt current ordinary range hood's body 1, and fan system 2 installs the below at the installation space furred ceiling promptly, and the whole oil smoke passageway length of fan is shorter relatively so, and the oil smoke can be faster enters into fan system 2. Of course, the oil smoke filtering system in this embodiment can also be applied to the body 1 of the general range hood.

But in order to prolong the length of oil smoke passageway, and then promote the oil smoke and remove the condensation effect of in-process, strengthen its filter effect, reduce the oil smoke volume that gets into in fan system 2, reduce the pollution to fan system 2 for fan system 2 can effectively work for a long time. The body 1 in this embodiment includes a smoke collecting hood 11, a fan cover 12 disposed outside the fan system 2, and a connecting hood 13 connected between the smoke collecting hood 11 and the fan cover 12, so that an internal cavity formed after the smoke collecting hood 11, the connecting hood 13, and the fan cover 12 are connected constitutes an oil smoke passage. Fan system 2 and fan cover 12 set up in installation space's furred ceiling top, and this mounted position of fan system 2 has then correspondingly prolonged the length of oil smoke passageway, can provide the filter effect of oil smoke, and the oil smoke passageway of extension usually can make fan system 2 can keep away from the user as far as possible, reduces fan system 2 noise at work to the influence of user. And the furred ceiling then can effectively keep apart the noise that 2 working processes of fan system produced, further reduces 2 noise at fan system to user's influence.

The oil smoke filtering system comprises at least two stages of filtering units, and the number of the filtering units is specifically determined according to the requirements on the filtering capacity of oil smoke and the specific size of an oil smoke channel. In this embodiment, the oil smoke filtering system includes three filtering units, that is, the oil smoke filtering system includes a first-stage filtering unit 3, a second-stage filtering unit 4, and a third-stage filtering unit 5.

Wherein the first grade filter unit 3 sets up the entry position at the oil smoke passageway, and second grade filter unit 4 sets up the low reaches at first grade filter unit 3, and tertiary filter unit 5 sets up the low reaches at second grade filter unit 4. In the present embodiment, specifically, the primary filter unit 3 is disposed inside the smoke collecting hood 11, the secondary filter unit 4 is disposed at the inlet end of the connecting hood 13, and the tertiary filter unit 5 is only disposed at the middle position of the connecting hood 13. Because one-level filter unit 3 sets up in collection petticoat pipe 11, when needing to wash, it is convenient relatively to dismantle the operation. The setting position of second grade filter unit 4 is close to collection petticoat pipe 11, also conveniently dismantles from collection petticoat pipe 11 opening position and changes, washs. In order to facilitate the attachment, detachment, and cleaning of the third-stage filtration unit 5, an openable and closable door 131 is provided on the body 1 corresponding to the third-stage filtration unit 5, and in this embodiment, the door 131 is provided on the connection cover 13.

This one-level filter unit 3 includes that a plurality of filter 30 that set up are arranged along oil smoke passageway entry span direction, and filter 30 extends along the air current direction of flow, so when the oil smoke through collection petticoat pipe 11 through one-level filter unit 3, the filter area of oil smoke can be guaranteed to this filter 30's the mode that sets up, and then avoids producing the problem that the oil smoke escaped because of blockking to the oil smoke. Meanwhile, as the situation of indeterminate movement is generated relative to a basic moving path in the oil smoke moving process, the oil smoke filtering effect can be exerted through the primary filtering unit 3, the oil smoke filtering difficulty of the secondary filtering unit 4 is reduced, and the service cycle of the secondary filtering unit 4 is prolonged. In order to improve the filtering effect of the first-stage filtering unit 3 on the oil smoke, the cross section of the filtering plate 30 is wavy, so that the attachment area of the filtering plate 30 is increased, the capturing capability on the oil smoke can be further improved, and the oil smoke filtering effect is enhanced.

In addition, the surface attachment of the filter plate 30 in this embodiment is provided with a coating for reducing the oil stain attachment capacity, the coating can adopt a magnetic film or a teflon coating, the coating greatly reduces the cleaning difficulty of the filter plate 30, and when the first-stage filter unit 3 needs to be cleaned, the filter plate 30 only needs to be placed under a faucet for simple washing.

The existing kitchen range usually has two cooking holes, and when the kitchen range is used, a user often uses one of the cooking holes to work, even if the two cooking holes are used to work simultaneously, the corresponding oil smoke concentrations generated at the positions of the cooking holes on the left side and the right side are different, so that the oil smoke accumulation degrees in different areas on the first-stage filtering unit 3 are different. In order to reduce the overall cleaning frequency of the first-stage filtering unit 3, as shown in fig. 3 and 4, in this embodiment, the first-stage filtering unit 3 includes at least two groups of filtering modules 31 arranged along the span direction of the inlet of the soot passage, and adjacent filtering modules 31 are connected by a splicing frame 32. The number of the filtering units is specifically set according to needs, and the filtering units are generally divided into zones according to the difference of the oil smoke accumulation amount. For example, in the oil smoke absorption of the cooking range having two cooking holes, two filter modules 31 may be arranged in a left-right direction. When the oil smoke purifier is used, each filtering module 31 carries out independent disassembly and cleaning according to the oil smoke accumulation condition of the filtering module. In order to facilitate the independent assembly and disassembly of each filter module 31, in this embodiment, the outer casing 312 is wrapped around each filter module 31, the fixing frames 311 extending along the arrangement direction of the filter plates 30 are disposed on the upper and lower sides of the outer casing 312, the upper and lower sides of each filter plate 30 are clamped on the corresponding fixing frames 311, and the fixing stability of the filter plates 30 is ensured by the structure of the fixing frames 311.

In order to facilitate understanding of the soot accumulation of each filter module 31 in the primary filter unit 3, an air volume sensor is respectively disposed at the upstream and downstream of each filter module 31 in the primary filter unit 3. When the range hood works, the air volume difference of the upstream position and the downstream position of each filtering module 31 is respectively detected corresponding to each filtering module 31, if the air volume difference ratio is greater than a set value, the filtering module 31 is judged to need to be cleaned, otherwise, the cleaning is not needed. When cleaning is needed, the user can be prompted to detach and clean the filter module 31 through the existing prompting means.

The second-stage filtering unit 4 is a filtering layer matched with and covering the oil smoke channel, the second-stage filtering unit 4 is used as a core filtering unit in the oil smoke, and the second-stage filtering unit 4 can fully play a role in filtering the oil smoke. Based on the filtering effect of the first-stage filtering unit 3 on the oil smoke, the oil smoke filtering difficulty of the second-stage filtering unit 4 can be reduced, and the service cycle of the second-stage filtering unit 4 is prolonged. The filter layer used as the secondary filter unit 4 in the embodiment is a filter layer made of foaming sponge or foam metal, the filter layer has a good oil smoke adsorption effect, and compared with a traditional metal mesh structure, the wind resistance is smaller, and the corresponding noise is relatively smaller. In order to further improve the oil smoke filtering effect of the secondary filtering unit 4, the oil smoke filtering area can be increased, in this embodiment, the plane of the filtering layer is inclined relative to the cross section of the oil smoke passage, so that compared with the arrangement mode parallel to the cross section of the filtering passage, the inclined arrangement mode can effectively increase the filtering surface. Specifically, the included angle between the plane of the filter layer and the cross section of the oil smoke channel is a, the range of the a is 30-40 degrees, and in the embodiment, the preferable a is 37.5 degrees, so that the filter area can be effectively increased, and the oil smoke interception capability can be ensured. In order to facilitate installation of the secondary filter unit 4, guide grooves are provided on both left and right side walls of the connecting cover 13 corresponding to the inclination angles of the filter layers, and the secondary filter unit 4 is inserted into the guide grooves to be installed.

In order to understand the degree of pollution of second grade filter unit 4 that can be better, guarantee second grade filter unit 4's filter capacity, avoid appearing the condition of big windage, and then avoid the influence to whole machine performance, be provided with wind pressure sensor respectively in second grade filter unit 4's upper reaches and low reaches, in operation, the wind pressure data that the wind pressure sensor who utilizes second grade filter unit 4's upper reaches and low reaches to set up, can calculate the pressure drop value between second grade filter unit 4 upper reaches and the low reaches, through the comparison between pressure drop value and the settlement pressure value, and then judge whether second grade filter unit 4 need wash or change, the pressure drop is big more, the greasy dirt of oil smoke piles up the condition more seriously on corresponding second grade filter unit 4.

Tertiary filter unit 5 not only can realize basic oil smoke filtering capability, can also condense the oil smoke in order to strengthen oil smoke filter effect, further avoids the pollution to fan system 2, can also heat the self-cleaning in order to carry out the greasy dirt to the greasy dirt, prolongs tertiary filter unit 5's life cycle. As shown in fig. 3 and 5, the three-stage filtering unit 5 includes at least one set of filtering members 51 and semiconductor chilling plates 52 disposed corresponding to the filtering members 51. The filter assemblies 51 in this embodiment are provided in two sets, and the two sets of filter assemblies 51 are arranged at intervals along the flowing direction of the airflow. Each group of filtering components 51 comprises a plurality of metal pipes 511 arranged in parallel, and the metal pipes 511 are arranged in a matrix and fit and span in the oil smoke channel. That is, the metal pipes 511 are arranged in a plurality of rows and columns, and the axis of the metal pipe 511 in this embodiment is perpendicular to the axis of the oil smoke passage, that is, the metal pipe 511 extends in the left-right direction, so that the metal pipe 511 performs a filtering function on the oil smoke flowing through. In order to improve the filtering effect, the metal pipes 511 arranged on different planes are staggered. In this embodiment, three adjacent metal tubes 511 located in two rows or two columns are distributed in a regular triangle shape on the cross section, and the distance between the adjacent metal tubes 511 is specifically set according to the specific requirement of the filtering effect.

In order to facilitate the overall disassembly and assembly operation of the third-stage filtering unit 5, the third-stage filtering unit 5 further comprises a frame shell 53 matched with the inner peripheral wall of the oil smoke channel, the filtering component 51 is fixed in the frame shell 53, the semiconductor chilling plate 52 is fixed on the rear side wall of the frame shell 53, the semiconductor chilling plate 52 is electrically connected with the power supply part of the range hood, and when the forward current and the reverse current are introduced, the semiconductor chilling plate 52 correspondingly condenses and heats. In order to conveniently determine whether to start the condensation filtering work of the oil smoke and further avoid the pollution to a downstream fan, an oil smoke concentration sensor is arranged at the upstream of the third-stage filtering unit 5. When the range hood works, the oil smoke concentration sensor is used for detecting the oil smoke concentration at the upstream position of the three-stage filtering unit 5, if the oil smoke concentration is less than a set concentration value, effective filtering of the oil smoke can be effectively realized by using the metal pipe 511 without refrigerating, and the oil smoke is prevented from further moving towards the fan system 2 to pollute the oil smoke system. If the oil smoke concentration is greater than the set concentration value, the semiconductor refrigerating sheet 52 is controlled to work, the temperature of the metal pipe 511 is further reduced, the oil smoke is condensed, the filtering effect on the oil smoke is improved, the probability that the oil smoke enters the fan system 2 is reduced, the pollution to the fan system 2 is reduced, and the service cycle of the fan is prolonged.

Since the third stage filtering unit 5 is disposed in the connecting cover 13, the assembly and disassembly are relatively troublesome, and in this embodiment, the third stage filtering unit 5 further includes a driving mechanism capable of driving the filtering assembly 51 to vibrate, such as a vibrating motor in the prior art. The self-cleaning of the three-stage filtering unit 5 is realized by heating the metal pipe 511 by the semiconductor refrigerating sheet 52 and driving the filtering component 51 by the driving mechanism in a vibration mode. Usually, the two ends of the metal tube 511 in each group of filtering assemblies 51 are respectively fixed by fixing pieces, and the driving mechanism is in contact with the fixing pieces, so as to drive the filtering assemblies 51 to vibrate integrally. In order to facilitate the determination of the timing of the self-cleaning operation of the tertiary filtration unit 5, the tertiary filtration unit 5 further comprises a load cell for weighing the weight change of the filter assembly 51. The weighing sensor can detect and obtain the weight change condition of the three-stage filtering unit 5, when the weight value detected and obtained by the weighing sensor exceeds a set value, the situation that more greasy dirt is accumulated on the three-stage filtering unit 5 is judged, self-cleaning is needed, when self-cleaning is carried out, reverse current is introduced to the semiconductor refrigerating sheet 52, the semiconductor refrigerating sheet 52 is heated, the greasy dirt on the metal pipe 511 is melted, then the driving mechanism drives the filtering component 51 to vibrate in a variable frequency mode, and the greasy dirt on the metal pipe 511 drops and is collected and guided out to an oil cup below the range hood. The self-cleaning process is usually carried out in the non-oil-fume-suction working state of the range hood. In order to reduce energy consumption during the self-cleaning process of the three-stage filtering unit 5, a temperature sensor is arranged at the downstream of the three-stage filtering unit 5, the temperature sensor is used for detecting the acquired temperature, and the self-cleaning work is carried out at the time of the best temperature in one day.

Along with long-time use, the interval time of self-cleaning is usually shorter and shorter, and at this moment, the user can be reminded to dismantle, clean or change the tertiary filtering unit 5 as required, namely, the door body 131 is opened, so that the three-stage filtering unit 5 is dismantled, cleaned or changed.

The setting mode of the filter plate 30 based on the first-stage filter unit 3 in the working process of the range hood can ensure the through flow, reduce the wind resistance at the inlet of the range hood and avoid the oil smoke from escaping. The structure of the multi-stage filtering unit enables the filtering effect on the oil smoke to be better, and the noise is low in the working process.

Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the utility model, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

Claims (21)

1. The utility model provides a range hood, is including body (1) that has the oil smoke passageway to and set up fan system (2), the oil smoke filtration system in the oil smoke passageway, the oil smoke filtration system sets up the upper reaches at fan system (2), its characterized in that: the oil smoke filtering system comprises a primary filtering unit (3) arranged at the position of an inlet of the oil smoke channel and a secondary filtering unit (4) positioned at the downstream of the primary filtering unit (3);

the primary filtering unit (3) comprises a plurality of filtering plates (30) which are arranged along the span direction of the oil smoke channel inlet, and the filtering plates (30) extend along the air flow direction;

the secondary filtering unit (4) is a filtering layer matched with the oil smoke channel.

2. The range hood of claim 1, wherein: and a third-stage filtering unit (5) capable of condensing and heating the oil smoke is further arranged at the downstream of the second-stage filtering unit (4) in the oil smoke channel.

3. The range hood of claim 2, wherein: the three-stage filtering unit (5) comprises at least one group of filtering components (51) and semiconductor refrigerating sheets (52) arranged corresponding to the filtering components (51), each filtering component (51) comprises a plurality of metal pipes (511) arranged in parallel, and the metal pipes (511) are matched and spanned in the oil smoke channel.

4. The range hood of claim 3, wherein: the metal pipes (511) in the filtering component (51) are arranged in a matrix manner, and the metal pipes (511) arranged on different planes are arranged in a staggered manner.

5. The range hood of claim 3, wherein: the three-stage filtering unit (5) further comprises a frame shell (53) matched with the inner peripheral wall of the oil smoke channel, and the filtering component (51) is fixed in the frame shell (53).

6. The range hood of claim 3, wherein: the three-stage filtering unit (5) further comprises a driving mechanism capable of driving the filtering component (51) to vibrate.

7. The range hood of claim 6, wherein: the three-stage filtering unit (5) also comprises a weighing sensor for weighing the weight change of the filtering component (51).

8. The range hood of claim 7, wherein: and a temperature sensor is also arranged in the oil smoke channel.

9. The range hood according to any one of claims 2 to 7, wherein: and an oil smoke concentration sensor is arranged at the upstream of the third-stage filtering unit (5).

10. The range hood according to any one of claims 2 to 7, wherein: the body (1) is provided with a door body (131) which can be opened and closed corresponding to the three-stage filtering unit (5).

11. The range hood according to any one of claims 1 to 7, wherein: the cross section of the filter plate (30) is wavy.

12. The range hood according to any one of claims 1 to 7, wherein: the surface of the filter plate (30) is attached with a coating which reduces the capability of adhering oil stains.

13. The range hood of claim 12, wherein: the coating is a magnetic film or a Teflon coating.

14. The range hood according to any one of claims 1 to 7, wherein: the first-stage filtering unit (3) comprises at least two groups of filtering modules (31) arranged along the span direction of the oil smoke channel inlet, and the adjacent filtering modules (31) are connected through a splicing frame (32).

15. The range hood of claim 14, wherein: and the upstream and the downstream of each filtering module (31) in the primary filtering unit (3) are respectively provided with an air volume sensor.

16. The range hood according to any one of claims 1 to 7, wherein: the plane of the filter layer is obliquely arranged relative to the cross section of the oil smoke channel.

17. The range hood of claim 16, wherein: the included angle between the plane of the filter layer and the cross section of the oil smoke channel is A, and the range of A is 30-40 degrees.

18. The range hood according to any one of claims 1 to 7, wherein: the filter layer is made of foaming sponge or foam metal.

19. The range hood according to any one of claims 1 to 7, wherein: and the upstream and the downstream of the secondary filtering unit (4) are respectively provided with a wind pressure sensor.

20. The range hood according to any one of claims 1 to 7, wherein: the body (1) comprises a fume collecting hood (11), a fan cover (12) arranged outside the fan system (2) and a connecting hood (13) connected between the fume collecting hood (11) and the fan cover (12), wherein the primary filtering unit (3) is arranged in the fume collecting hood (11), and the secondary filtering unit (4) is arranged at the inlet end of the connecting hood (13).

21. The range hood of claim 20, wherein: the fan system (2) and the fan cover (12) are arranged above a ceiling of the installation space.

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