Grease separation device for range hood

Abstract

The invention discloses a grease separation device for a range hood, and relates to the technical field of range hoods, the grease separation device comprises a fixed frame, the outer side of the fixed frame is provided with a grease separation mechanism, the grease separation mechanism comprises a filter shell, and the inner wall of the filter shell is fixedly connected with a condensation separation plate, a guide plate and a plurality of same filter plates; according to the grease separation device for the range hood, a multi-stage separation structure is adopted, large-particle grease in lampblack is preliminarily filtered through the filter plate, then the large-particle grease passes through the condensation separation plate which is of a wave-shaped structure and provided with condensation protruding points, and the large-particle grease in the lampblack is separated through the condensation separation plate; the contact area and the contact time of oil fume and a condensation surface are increased, grease is fully condensed and separated out, a subsequent centrifugal separation assembly drives an air guide blade to rotate through a second stepping motor, a flow center impeller is driven to rotate at a high speed, fine oil drops are further separated through centrifugal force, and the grease separation purity is greatly improved through the synergistic effect of multi-stage separation.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, specifically to a grease separation device for range hoods. Background Technology

[0002] As the core equipment for purifying kitchen fumes, the range hood's main function is to quickly capture the fumes generated during cooking and remove pollutants such as grease and particulate matter from them through separation and filtration. Finally, the purified gas is discharged outdoors, thus ensuring kitchen air quality and human health.

[0003] Modern range hoods rely solely on filter plates for separation. However, after prolonged use, the filter plate surface is easily clogged with grease, leading to increased ventilation resistance, decreased smoke extraction efficiency, and the need for frequent disassembly and cleaning, which is cumbersome. Devices using traditional condensation technology have a simple condensation contact surface design, resulting in short contact time and limited contact area between the grease and the condensation surface. This leads to insufficient grease condensation and separation, and some fine oil droplets are still discharged with the smoke, which not only affects the purification effect but may also cause grease buildup in the pipes, posing a safety hazard.

[0004] Combining the above issues, we find that existing grease separation devices are difficult to avoid all the problems mentioned above when in use. Even if they can solve the problems, they require the use of external tools, which makes it impossible to achieve the desired effect. Therefore, we propose a grease separation device for range hoods. Summary of the Invention

[0005] The purpose of this invention is to provide a grease separation device for range hoods to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a grease separation device for a range hood, comprising a fixed frame, an grease separation mechanism disposed on the outer side of the fixed frame, the grease separation mechanism comprising a filter housing, a condensation separation plate, a guide plate and several identical filter plates fixedly connected to the inner wall of the filter housing, two first stepper motors and four fixed brackets fixedly connected to the outer surface of the guide plate, two first bearings fixedly connected to the inner wall of each set of fixed brackets, a lead screw fixedly connected to the inner ring of each set of first bearings, a movable block threadedly connected to the outer surface of each lead screw, and a grease scraper fixedly connected to the side of two movable blocks that are close to each other; The fixed frame is equipped with a centrifugal separation component inside, and the oil separation mechanism is equipped with a collection component on the outside.

[0007] Preferably, the centrifugal separation assembly includes a flow core impeller, a guide vane, and a second stepper motor. A second bearing is fixedly connected to the inner wall of the guide vane. The outer surface of the output end of the second stepper motor is fixedly connected to the inner ring of the second bearing. A flow guide seat is fixedly connected to the inner wall of the flow core impeller. The outer surface of the flow core impeller is fixedly connected to the inner wall of the fixed frame.

[0008] Preferably, the collection assembly includes a smoke exhaust pipe and a grease collection box. A filter screen is fixedly connected to the inner wall of the smoke exhaust pipe. The bottom end of the smoke exhaust pipe is fixedly connected to the upper surface of the fixed frame. A collection groove is formed on the outer surface of the grease collection box. A rubber stopper is snapped into the inside of the grease collection box. A level gauge is fixedly connected to the outer surface of the grease collection box.

[0009] Preferably, a sealing ring is fixedly connected to the outer surface of the exhaust pipe, and the bottom end of the sealing ring is fixedly connected to the upper surface of the fixed frame.

[0010] Preferably, the outer surface of the grease scraper is fixedly connected to two limiting plates, and the side of the two limiting plates that are far apart from each other is fixedly connected to the side of the two movable blocks that are close to each other.

[0011] Preferably, each of the limiting plates has two fixing bolts threadedly connected to its inner wall, and the outer surface of each set of fixing bolts is threadedly connected to the inner wall of the movable block.

[0012] Preferably, a protective shell is fixedly connected to the outer surface of the second stepper motor, and the bottom surface of the protective shell is fixedly connected to the outer surface of the air guide blade.

[0013] Preferably, the outer surface of the guide vane is fixedly connected to three connecting plates, and the outer surface of each connecting plate is fixedly connected to the inner wall of the flow center impeller.

[0014] Preferably, the outer surface of each stepper motor output end is fixedly connected to the inner ring of the first bearing, and the outer surface of the grease scraper is in contact with the outer surface of the guide plate.

[0015] Preferably, the condensation separation plate has a corrugated structure with several condensation protrusions on its surface. The grease separation mechanism, centrifugal separation component, collection component and range hood housing are detachably connected by a snap-fit ​​structure. The snap-fit ​​structure includes an elastic snap-fit ​​on the outside of the device and a slot on the inner wall of the housing.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention employs a multi-stage separation structure. First, the fumes are filtered by a filter plate to remove large grease particles. Then, they pass through a condensation separation plate with a wave-shaped structure and condensation protrusions, increasing the contact area and time between the fumes and the condensation surface, allowing the grease to fully condense and precipitate. Subsequently, a centrifugal separation component, driven by a second stepper motor, rotates the guide vanes, causing the impeller to rotate at high speed. Centrifugal force further separates the fine oil droplets. This multi-stage separation works synergistically to significantly improve the purity of grease separation, reduce the amount of grease discharged with the flue gas, prevent grease buildup in pipes, and reduce safety hazards.

[0017] 2. This invention uses a stepper motor to drive the lead screw to rotate, which in turn moves the movable block and the grease scraper. This automatically scrapes off the grease adhering to the surface of the guide plate, avoiding the problems of increased ventilation resistance and reduced smoke exhaust efficiency caused by grease blockage of the filter plate and guide plate. It eliminates the need for frequent disassembly and cleaning, reducing maintenance difficulty and workload. The limit plate and fixing bolts ensure that the grease scraper moves smoothly and is firmly connected, guaranteeing the cleaning effect.

[0018] 3. This invention collects the separated grease through a collection tank, and a level gauge displays the grease level in the box in real time, facilitating timely cleaning by the user. The rubber stopper facilitates sealing and grease discharge, preventing grease leakage and environmental pollution. The filter screen inside the exhaust duct further filters fine impurities in the flue gas, and the sealing ring enhances the seal between the exhaust duct and the fixed frame, preventing flue gas leakage and improving environmental performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the filter plate of the present invention; Figure 3 This is a schematic diagram of the condensation separation plate of the present invention; Figure 4 This is a schematic diagram of the structure of the guide plate of the present invention; Figure 5 This is a schematic diagram of the structure of the active block of the present invention; Figure 6 This is a schematic diagram of the flow-core impeller of the present invention; Figure 7 This is a schematic diagram of the structure of the wind guide blade of the present invention; Figure 8 This is a schematic diagram of the structure of the second stepper motor of the present invention; Figure 9 This is a schematic diagram of the structure of the filter screen of the present invention; Figure 10 This is a schematic diagram of the structure of the grease collection box of the present invention.

[0020] In the picture: 1. Fixed frame; 2. Grease separation mechanism; 201. Filter housing; 202. Filter plate; 203. Condensation separation plate; 204. Guide plate; 205. Grease scraper; 206. First stepper motor; 207. Fixing frame; 208. First bearing; 209. Lead screw; 210. Movable block; 211. Limiting plate; 212. Fixing bolt; 3. Centrifugal separation assembly; 301. Flow impeller; 302. Connecting plate; 303. Protective housing; 304. Flow guide seat; 305. Guide vane; 306. Second stepper motor; 307. Second bearing; 4. Collection components; 401. Exhaust duct; 402. Filter screen; 403. Sealing ring; 404. Grease collection box; 405. Collection tank; 406. Rubber stopper; 407. Level gauge. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1-5 The present invention provides a technical solution: a grease separation device for a range hood, comprising a fixed frame 1, a grease separation mechanism 2 disposed on the outer side of the fixed frame 1, the grease separation mechanism 2 comprising a filter housing 201, a condensation separation plate 203, a guide plate 204 and several identical filter plates 202 fixedly connected to the inner wall of the filter housing 201, two first stepper motors 206 and four fixed brackets 207 fixedly connected to the outer surface of the guide plate 204, two first bearings 208 fixedly connected to the inner wall of each set of fixed brackets 207, a lead screw 209 fixedly connected to the inner ring of each set of first bearings 208, a movable block 210 threadedly connected to the outer surface of each lead screw 209, and a grease scraper 205 fixedly connected to the side of two movable blocks 210 that are close to each other.

[0023] Two limiting plates 211 are fixedly connected to the outer surface of the grease scraper 205. The side of the two limiting plates 211 that is far apart from each other is fixedly connected to the side of the two movable blocks 210 that is close to each other. The limiting plates 211 can restrict the position of the movable blocks 210 and prevent them from shifting during movement. Each limiting plate 211 has two fixing bolts 212 threadedly connected to its inner wall. The outer surface of each set of fixing bolts 212 is threadedly connected to the inner wall of the movable block 210. The fixing bolts 212 can fix the limiting plate 211 and the movable block 210 to prevent their position from shifting or becoming unstable during use. The outer surface of the output end of each stepper motor 206 is fixedly connected to the inner ring of the first bearing 208. The outer surface of the grease scraper 205 is in contact with the outer surface of the guide plate 204. The grease scraper 205 can be used to clean and collect grease, thus enhancing the applicability of the device.

[0024] The specific implementation method of this embodiment is as follows: After the oil fumes enter the filter housing 201, they first flow through several parallel filter plates 202. The filter plates 202 adopt a high-density filter structure to initially intercept and filter large particles of oil, cooking residues and other impurities in the oil fumes, so as to achieve rapid separation of large-particle pollutants and avoid clogging of subsequent separation components. The oil fumes that have passed the initial filtration continue to flow to the condensation separation plate 203. The separation plate has a wave-shaped design and several condensation protrusions distributed on its surface. The wave-shaped structure extends the flow path of the oil fumes, and the condensation protrusions further increase the contact area between the oil fumes and the condensation surface, while slowing down the flow rate of the oil fumes, so as to significantly increase the contact time between the oil fumes and the condensation surface. During the process of the oil fumes fully contacting the surface of the condensation separation plate 203, the oil vapor condenses upon contact with the condenser, forming liquid oil and adhering to the surface of the separation plate and the subsequent guide plate 204, completing the secondary separation of oil and laying the foundation for subsequent centrifugal separation.

[0025] Example 2: Please refer to Figure 6 , Figure 7 and Figure 8 The present invention provides a technical solution: a grease separation device for range hoods. The present invention makes corresponding improvements to the technical problems mentioned in the background art. A centrifugal separation component 3 is provided inside the fixed frame 1.

[0026] As a further definition of the centrifugal separation component 3 of the present invention, the centrifugal separation component 3 includes a flow center impeller 301, a guide vane 305, and a second stepper motor 306. A second bearing 307 is fixedly connected to the inner wall of the guide vane 305. The outer surface of the output end of the second stepper motor 306 is fixedly connected to the inner ring of the second bearing 307. A flow guide seat 304 is fixedly connected to the inner wall of the flow center impeller 301. The outer surface of the flow center impeller 301 is fixedly connected to the inner wall of the fixed frame 1.

[0027] The outer surface of the second stepper motor 306 is fixedly connected to a protective shell 303. The bottom surface of the protective shell 303 is fixedly connected to the outer surface of the air guide vane 305. The protective shell 303 can protect the second stepper motor 306 and prevent it from being damaged by the outside during use. Three connecting plates 302 are fixedly connected to the outer surface of the guide vane 305. The outer surface of each connecting plate 302 is fixedly connected to the inner wall of the flow impeller 301. Through the connecting plates 302, the guide vane 305 and the flow impeller 301 can be reinforced, thereby enhancing the stability of the device.

[0028] The specific implementation method of this embodiment is as follows: The second stepper motor 306 is started, and the motor output transmits power through the second bearing 307, driving the guide vanes 305 to rotate. The guide vanes 305 are fixedly connected to the impeller 301 via three evenly distributed connecting plates 302, thereby driving the impeller 301 to rotate at high speed. The rotation speed can be adaptively adjusted according to the oil fume concentration. After condensation and separation, the oil fume, guided by the guide plate 204, smoothly enters the working area of ​​the impeller 301. The guide plate 304 optimizes the inflow path of the oil fume, making the oil fume evenly distributed. Inside the flow impeller 301, to avoid uneven local flow velocity affecting the separation effect, the high-speed rotation of the flow impeller 301 generates a strong centrifugal force. Under the action of centrifugal force, the fine oil droplets that have not been condensed and separated in the oil fume overcome the airflow resistance and are thrown towards the inner wall of the flow impeller 301. The oil droplets gather on the inner wall of the impeller to form an oil film, and then flow along the inner wall and drip onto the collection component 4, realizing three-stage fine separation of grease. The protective shell 303 outside the second stepper motor 306 effectively isolates oil fume, grease and water vapor, prevents corrosion and damage to the internal components of the motor, and ensures long-term stable operation of the motor.

[0029] Example 3: Please refer to Figure 1 , Figure 9 and Figure 10 The present invention provides a technical solution: a grease separation device for range hoods. The present invention makes corresponding improvements to the technical problems mentioned in the background art. A collection component 4 is provided on the outer side of the grease separation mechanism 2.

[0030] As a further definition of the collection component 4 of the present invention, the collection component 4 includes a smoke exhaust pipe 401 and a grease collection box 404. A filter screen 402 is fixedly connected to the inner wall of the smoke exhaust pipe 401. The bottom end of the smoke exhaust pipe 401 is fixedly connected to the upper surface of the fixed frame 1. A collection groove 405 is opened on the outer surface of the grease collection box 404. A rubber plug 406 is snapped into the inside of the grease collection box 404. A level gauge 407 is fixedly connected to the outer surface of the grease collection box 404.

[0031] A sealing ring 403 is fixedly connected to the outer surface of the exhaust duct 401. The bottom end of the sealing ring 403 is fixedly connected to the upper surface of the fixed frame 1. The sealing ring 403 can effectively prevent grease leakage and avoid pollution to the external environment. The condensation separation plate 203 has a corrugated structure with several condensation protrusions on its surface. The grease separation mechanism 2, the centrifugal separation component 3, the collection component 4, and the range hood housing are detachably connected by a snap-fit ​​structure. The snap-fit ​​structure includes an elastic snap-fit ​​on the outside of the device and a slot on the inner wall of the housing. The condensation separation plate 203 can cool down the fumes, making it easier to separate and collect the grease in the fumes.

[0032] The specific implementation of this embodiment is as follows: After the device has been running for a certain period of time, the automatic cleaning program is started. The two first stepper motors 206 start synchronously. The output end of the motor is fixedly connected to the inner ring of the first bearing 208. The drive screw 209 rotates smoothly under the support of the fixed frame 207. The screw 209 and the movable block 210 are precision threaded. When the screw 209 rotates, the movable block 210 moves linearly along the axis of the screw 209. The two movable blocks 210 drive the fixedly connected grease scraper 205 to move synchronously. The grease scraper 205 is in close contact with the surface of the guide plate 204. During the movement, it scrapes off the solidified grease and impurities attached to the surface of the guide plate 204. The limiting plates 211 on both sides of the grease scraper 205 restrict the movement trajectory of the movable block 210 to prevent it from deviating and causing incomplete cleaning. The fixing bolts 212 further strengthen the connection between the limiting plates 211 and the movable block 210 to ensure that the grease scraper 205 is under stable force during the cleaning process and does not loosen. Grease drips under gravity and collects in the collection tank 405 of the grease collection box 404 through the guide structure of the filter housing 201. The liquid level gauge 407 on the outer surface of the collection box monitors the grease level in real time, allowing users to intuitively understand their cleaning needs. When the grease level reaches the preset value, the user can pull out the rubber plug 406 to discharge the collected grease. The rubber plug 406 fits tightly with the interface of the collection box to prevent grease leakage and environmental pollution. The purified flue gas enters the exhaust pipe 401. The filter screen 402 on the inner wall of the pipe performs final filtration of the trace impurities remaining in the flue gas. The sealing ring 403 at the connection between the exhaust pipe 401 and the fixed frame 1 enhances the sealing performance, preventing leakage of purified flue gas and ensuring that the flue gas is completely discharged outdoors. If deep maintenance of the device is required, the grease separation mechanism 2, centrifugal separation component 3 and collection component 4 can be quickly disassembled by using the elastic buckle on the outside of the device and the groove on the inner wall of the range hood housing. No additional tools are required, making the operation convenient.

[0033] Specifically, the grease separator in this range hood operates as follows: First, after the fumes enter the filter housing 201, they flow through several parallel filter plates 202. The filter plates 202 adopt a high-density filter structure to initially intercept and filter large particles of grease, cooking residues and other impurities in the fumes, achieving rapid separation of large-particle pollutants and avoiding clogging of subsequent separation components. The fumes that have passed the initial filtration continue to flow to the condensation separation plate 203. This separation plate has a wave-shaped design and several condensation protrusions distributed on its surface. The wave-shaped structure extends the flow path of the fumes, and the condensation protrusions further increase the contact area between the fumes and the condensation surface, while slowing down the flow rate of the fumes, thus significantly increasing the contact time between the fumes and the condensation surface. During the process of the fumes fully contacting the surface of the condensation separation plate 203, the grease vapor condenses upon contact with the condenser, forming liquid grease that adheres to the surface of the separation plate and the subsequent guide plate 204, completing the secondary separation of grease and laying the foundation for subsequent centrifugal separation. Then, the second stepper motor 306 is started. The motor output transmits power through the second bearing 307, driving the guide vanes 305 to rotate. The guide vanes 305 are fixedly connected to the impeller 301 through three evenly distributed connecting plates 302, thereby driving the impeller 301 to rotate at high speed. The speed can be adaptively adjusted according to the oil fume concentration. After condensation and separation, the oil fume enters the working area of ​​the impeller 301 smoothly under the guidance of the guide plate 204. The guide plate 304 optimizes the inflow path of the oil fume, making the oil fume evenly distributed on the impeller 301. 01 Inside, to avoid uneven local flow velocity affecting the separation effect, the high-speed rotation of the flow impeller 301 generates a strong centrifugal force. The fine oil droplets in the oil fume that have not been condensed and separated are thrown towards the inner wall of the flow impeller 301 under the action of centrifugal force, overcoming the airflow resistance. The oil droplets gather on the inner wall of the impeller to form an oil film, and then flow along the inner wall and drip to the collection component 4, realizing the three-stage fine separation of grease. The protective shell 303 outside the second stepper motor 306 effectively isolates oil fume, grease and water vapor, prevents corrosion and damage to the internal components of the motor, and ensures the long-term stable operation of the motor. Furthermore, after the device has run for a certain period, the automatic cleaning program is activated. The two first-step motors 206 start synchronously, with their output ends fixedly connected to the inner ring of the first bearing 208. The drive screw 209 rotates smoothly under the support of the fixed frame 207. The screw 209 and the movable block 210 are precisely threaded together. When the screw 209 rotates, the movable block 210 moves linearly along the axis of the screw 209. The two movable blocks 210 drive the fixedly connected grease scraper 205 to move synchronously. The grease scraper 205 is in close contact with the surface of the guide plate 204, scraping away solidified grease and impurities adhering to the surface of the guide plate 204 during movement. The limiting plates 211 on both sides of the grease scraper 205 restrict the movement trajectory of the movable block 210, preventing it from shifting and causing incomplete cleaning. The fixing bolts 212 further reinforce the connection between the limiting plates 211 and the movable block 210, ensuring that the grease scraper 205 is under stable force during cleaning and does not loosen. The scraped grease is removed by gravity. The grease drips down through the filter housing 201 and is collected in the collection tank 405 of the grease collection box 404. The level gauge 407 on the outer surface of the collection box monitors the grease level in real time, allowing users to intuitively understand their cleaning needs. When the grease level reaches a preset value, the user can pull out the rubber plug 406 to discharge the collected grease. The rubber plug 406 fits tightly with the collection box interface to prevent grease leakage and environmental pollution. The purified fumes enter the exhaust pipe 401, where the filter screen 402 on the inner wall of the pipe performs final filtration of the trace impurities remaining in the fumes. The sealing ring 403 at the connection between the exhaust pipe 401 and the fixed frame 1 enhances the sealing performance, preventing leakage of purified fumes and ensuring complete exhaust of fumes outdoors. If deep maintenance is required, the grease separation mechanism 2, centrifugal separation component 3, and collection component 4 can be quickly disassembled by engaging the elastic buckle on the outer side of the device with the groove on the inner wall of the range hood housing. No additional tools are required, making the operation convenient.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grease separation device for a range hood, comprising a fixed frame (1), characterized in that: The fixed frame (1) is provided with an oil separation mechanism (2) on its outer side. The oil separation mechanism (2) includes a filter shell (201). The inner wall of the filter shell (201) is fixedly connected to a condensation separation plate (203), a guide plate (204) and several identical filter plates (202). The outer surface of the guide plate (204) is fixedly connected to two first stepper motors (206) and four fixed frames (207). The inner wall of each set of fixed frames (207) is fixedly connected to two first bearings (208). The inner ring of each set of first bearings (208) is fixedly connected to a lead screw (209). The outer surface of each lead screw (209) is threadedly connected to a movable block (210). The two movable blocks (210) are fixedly connected to an oil scraper (205) on their adjacent sides. The fixed frame (1) is provided with a centrifugal separation component (3) inside, and the oil separation mechanism (2) is provided with a collection component (4) outside.

2. The grease separation device for a range hood according to claim 1, characterized in that: The centrifugal separation assembly (3) includes a flow impeller (301), a guide vane (305), and a second stepper motor (306). The inner wall of the guide vane (305) is fixedly connected to a second bearing (307). The outer surface of the output end of the second stepper motor (306) is fixedly connected to the inner ring of the second bearing (307). The inner wall of the flow impeller (301) is fixedly connected to a flow guide seat (304). The outer surface of the flow impeller (301) is fixedly connected to the inner wall of the fixed frame (1).

3. The grease separation device for a range hood according to claim 1, characterized in that: The collection component (4) includes a smoke exhaust pipe (401) and a grease collection box (404). A filter screen (402) is fixedly connected to the inner wall of the smoke exhaust pipe (401). The bottom end of the smoke exhaust pipe (401) is fixedly connected to the upper surface of the fixed frame (1). A collection groove (405) is opened on the outer surface of the grease collection box (404). A rubber stopper (406) is snapped into the inside of the grease collection box (404). A level gauge (407) is fixedly connected to the outer surface of the grease collection box (404).

4. The grease separation device for a range hood according to claim 3, characterized in that: A sealing ring (403) is fixedly connected to the outer surface of the exhaust pipe (401), and the bottom end of the sealing ring (403) is fixedly connected to the upper surface of the fixed frame (1).

5. The grease separation device for a range hood according to claim 1, characterized in that: Two limiting plates (211) are fixedly connected to the outer surface of the grease scraper (205), and the side of the two limiting plates (211) that are far apart from each other is fixedly connected to the side of the two movable blocks (210) that are close to each other.

6. The grease separation device for a range hood according to claim 5, characterized in that: Each of the limiting plates (211) has two fixing bolts (212) threadedly connected to its inner wall, and the outer surface of each set of fixing bolts (212) is threadedly connected to the inner wall of the movable block (210).

7. The grease separation device for a range hood according to claim 2, characterized in that: The outer surface of the second stepper motor (306) is fixedly connected to a protective shell (303), and the bottom surface of the protective shell (303) is fixedly connected to the outer surface of the air guide blade (305).

8. The grease separation device for a range hood according to claim 2, characterized in that: The outer surface of the guide vane (305) is fixedly connected to three connecting plates (302), and the outer surface of each connecting plate (302) is fixedly connected to the inner wall of the flow center impeller (301).

9. The grease separation device for a range hood according to claim 1, characterized in that: The outer surface of the output end of each of the first stepper motors (206) is fixedly connected to the inner ring of the first bearing (208), and the outer surface of the grease scraper (205) is in contact with the outer surface of the guide plate (204).

10. A grease separation device for a range hood according to claim 1, characterized in that: The condensation separation plate (203) has a wave-shaped structure and several condensation protrusions on its surface. The grease separation mechanism (2), centrifugal separation component (3), collection component (4) and range hood housing are detachably connected by a snap-fit ​​structure. The snap-fit ​​structure includes an elastic snap-fit ​​on the outside of the device and a slot on the inner wall of the housing.

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