Sealed range hood motor protection device capable of preventing greasy dirt from invading

Abstract

The invention discloses a sealed range hood motor protection device capable of preventing greasy dirt from invading, and relates to the technical field of flue gas pumps. The invention discloses a sealed range hood motor protection device capable of preventing greasy dirt from invading. The device comprises an interception assembly and a sealing mechanism, the intercepting assembly comprises an intercepting mechanism, the intercepting mechanism comprises a main barrel, the side, away from the range hood impeller, of the main barrel is fixedly connected with a tail barrel in a covering mode, the central axis of the main barrel is provided with a shaft barrel fixedly connected with a motor output shaft in a sleeving mode, the shaft barrel penetrates through and is fixedly connected with the tail barrel, and reverse rotation blades are evenly and fixedly connected between the main barrel and the shaft barrel at equal intervals; the side, close to the range hood impeller, of the main cylinder is fixedly connected with a head cylinder, the end, away from the main cylinder, of the head cylinder is expanded outwards, the expanded end of the head cylinder is fixedly connected with an oil collecting edge, inclined oil leakage holes are evenly formed in the oil collecting edge at equal intervals in a penetrating mode, and clamping grooves are evenly formed in the inner wall of the end, close to the main cylinder, of the head cylinder at equal intervals. And a net surface mechanism is buckled in the head cylinder, so that polymorphic pollutants are prevented from invading the motor, and the oil stain invasion prevention performance is improved.

Description

Technical Field

[0001] This invention relates to the field of flue gas pump technology, specifically a sealed motor protection device for preventing oil contamination in a range hood. Background Technology

[0002] As the core equipment for purifying kitchen fumes, range hoods are essentially small household fume conveying devices. Their working principle is highly similar to that of industrial flue gas pumps (such as centrifugal and Roots pumps), both relying on a motor to drive an impeller to rotate at high speed, creating negative pressure to capture and transport pollutant-containing media (industrial fumes / kitchen fumes). The core difference lies in the characteristics of the media: kitchen fumes are high-temperature aerosols containing animal and vegetable oils, moisture, and food residue (temperatures can reach 180℃, oil particle size 0.1-10μm), which are more prone to adhesion and solidification than mineral oil mist and dust in industrial fumes. This places more stringent requirements on the protection of the power core (motor) in terms of "anti-adhesion, easy cleaning, and long service life."

[0003] In the existing motor protection design of range hoods and small flue gas pumps, the core problem lies in the "failure to block the gradual intrusion of oil stains".

[0004] Current range hood motor protection mostly adopts a simple architecture of pre-filter and rear-end sealing. This approach originates from the dust protection design of small flue gas pumps, but it has not been adapted and optimized for the highly adhesive characteristics of oil fumes. The metal mesh cover or non-woven filter at the air inlet of the range hood can only intercept large oil droplets and food residue with a particle size of ≥5μm. For submicron-sized oil mist, which accounts for more than 70%, the filter interception rate is less than 30%. A large amount of oil mist penetrates the filter with the airflow and directly impacts the gap between the impeller and the output shaft at the front end of the motor. This is essentially the same problem as "coarse filters cannot prevent fine particles from entering the bearings" in industrial flue gas pumps. However, the adhesiveness of oil fumes will cause uninterrupted oil mist to accumulate rapidly on the surface of moving parts, resulting in the inefficiency of the pre-interception stage of the range hood motor and reducing the protection of the range hood motor.

[0005] Therefore, there is an urgent need for a sealed range hood motor protection device to prevent oil contamination and solve the aforementioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide a sealed range hood motor protection device to prevent oil contamination, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a sealed range hood motor protection device for preventing oil contamination, comprising an interception component and a sealing mechanism installed on the motor output shaft, wherein the interception component is close to the range hood impeller; The interception assembly includes an interception mechanism, which includes a main cylinder. A tail cylinder is fixedly attached to the side of the main cylinder away from the range hood impeller. The end of the tail cylinder away from the main cylinder is tapered inward. A shaft cylinder is fixedly sleeved to the motor output shaft at the central axis of the main cylinder. The shaft cylinder passes through and is fixedly connected to the tail cylinder. Reverse rotation blades are fixedly connected at equal intervals between the main cylinder and the shaft cylinder. The main cylinder is fixedly connected to a head cylinder on the side near the impeller of the range hood. The end of the head cylinder away from the main cylinder is expanded outward. An oil collecting edge is fixedly connected to the expanded end of the head cylinder. Inclined oil leakage holes are evenly and equidistantly opened through the oil collecting edge. The inner wall of the end of the head cylinder near the main cylinder is evenly and equidistantly opened with slots. The head tube is internally fitted with a mesh mechanism; The outer sides of the interception component and the sealing mechanism are jointly covered by a cover installed on the inner wall of the range hood.

[0008] As a preferred embodiment of the present invention, suction blades are fixedly connected at equal intervals on the outer side of the tail cylinder.

[0009] As a preferred embodiment of the present invention, the mesh mechanism includes a mesh surface adapted to be connected to the main cylinder, the middle part of the mesh surface protrudes towards the main cylinder, and the outer side of the mesh surface is uniformly and equidistantly fixedly connected with a card block adapted to be inserted into a card slot.

[0010] A scraper mechanism is provided on the side of the mesh structure away from the main cylinder. The scraper mechanism includes a collar that is movably connected to the shaft cylinder, and a scraper that fits the mesh surface is fixedly connected to the outer side of the collar.

[0011] As a preferred embodiment of the present invention, the sealing mechanism includes a sealing cylinder that is fixedly connected to the motor tailstock, a sealing block that is fixedly embedded in the sealing cylinder, a plate frame with an internal skeleton that is fixedly embedded in the sealing block, the plate frame having a T-shaped cross section, and lip plates that fit the motor output shaft extending from the inner end of the plate frame to both sides, and a spring ring being sleeved on the outer side of each lip plate. The sealing cylinder has stepped grooves on both sides, and a snap-fit ​​cover that fits the sealing block is fixedly fastened in each stepped groove. A bearing ring that fits the motor output shaft is embedded in the middle of the snap-fit ​​cover.

[0012] The main cylinder is movably inserted through the end wall of the cover.

[0013] The port of the cover is provided with a heat dissipation mechanism for heat dissipation. The heat dissipation mechanism includes a mesh plate with a fixed embedded cover port, and the mesh plate is fitted with a sealing cylinder; The outer side of the mesh plate is provided with a heat dissipation assembly that fits onto the motor tailstock. The heat dissipation assembly includes ring-shaped retaining plates. A screw is threaded through the center of the surface of each retaining plate. A knob is fixedly connected to the outer end of the screw, and a rod head that fits onto the motor tailstock is fixedly connected to the inner end of the screw. Adjacent retaining plates are fixedly connected to heat dissipation chambers with built-in cooling liquid. Each heat dissipation chamber has a base plate fixedly connected to it at equal intervals on its outer side. The free end of the base plate is tilted towards the mesh plate. Each base plate has air holes that are evenly spaced through its bottom. The air holes on adjacent base plates are staggered. A thermal pad is filled between the heat dissipation chamber and the motor tailstock; Both the retaining plate and the heat dissipation chamber are fixedly connected to the mesh plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: (1) A sealed range hood motor protection device for preventing oil pollution intrusion, wherein an interception mechanism is set between the motor base and the range hood impeller to intercept most of the oil fumes moving toward the motor, and the shaft sleeve is fixedly sleeved on the motor output shaft, thereby driving the anti-rotation blades to rotate and guide the airflow toward the range hood impeller, so as to reverse the oil fumes moving toward the motor side to the impeller, thereby reducing the amount of oil fumes escaping toward the motor defense line.

[0015] (2) A sealed range hood motor protection device for preventing oil pollution intrusion, wherein the mesh structure serves as an interception barrier inside the interception mechanism, which can specifically block oil pollutants of different particle sizes, thereby reducing the direct contact between the anti-rotation blades and oil pollution from the source. The mesh is a honeycomb mesh, which can intercept large oil smoke particles, with only a very small number of oil mists able to penetrate, directly intercepting oil smoke particles and significantly reducing the oil pollution contact load on the anti-rotation blades.

[0016] (3) A sealed range hood motor protection device for preventing oil intrusion, which eliminates eddies through the rectification effect of the mesh surface, so that the airflow flows smoothly to the impeller in a laminar state. The softened airflow can make the oil fume particles evenly distributed in the head cylinder. The impact of the uniform airflow on the impeller is more gentle, avoiding the impeller being under uneven load due to uneven airflow, reducing the problem of excessive oil adhesion in the impeller, and indirectly reducing the frequency of impeller cleaning.

[0017] (4) A sealed range hood motor protection device for preventing oil intrusion, wherein the mesh is attached to the head cylinder by a locking block and a locking groove and rotates with it, and the collar is movably sleeved on the shaft cylinder, thereby causing rotational displacement between the mesh and the scraper, which in turn causes the scraper to clean and scrape off the oil mist particles accumulated on the mesh, thus cleaning the mesh mechanism in time and improving the sustainable working capacity of the mesh mechanism.

[0018] (5) A sealed range hood motor protection device for preventing oil intrusion, wherein a large amount of oil intercepted by the mesh mechanism is pushed towards the oil collection edge by centrifugal force along the convex surface of the mesh and the inner surface of the head cylinder under the rotation of the interception mechanism, and is redirected to the range hood impeller through the oil leakage hole, and then discharged through the oil outlet of the range hood, thereby avoiding secondary pollution of the oil and waste of collected oil resources, and improving the efficiency of directional oil recovery.

[0019] (6) A sealed range hood motor protection device for preventing oil contamination, wherein the lip plate adopts a double-lip reverse design, the side near the impeller is a dustproof lip that intercepts solid impurities and large oil droplets, and the side near the motor is a sealing lip filled with food-grade high-temperature grease to form an oil film seal, thereby achieving graded and precise interception, blocking multi-form pollutants from entering the motor, and improving the performance of preventing oil contamination.

[0020] (7) A sealed range hood motor protection device for preventing oil contamination, wherein the heat dissipation chamber absorbs a large amount of heat generated by the motor tailstock through the heat conduction pad, and then dissipates it through the base plate connected to the heat dissipation chamber. At the same time, the airflow is guided through the mesh plate into the inside of the cover by the uniformly fixed air suction blades on the outside of the tail cylinder, thereby guiding the external airflow over the base plate, thereby increasing the contact rate between the base plate and the air, and further improving the heat dissipation effect.

[0021] (8) A sealed range hood motor protection device for preventing oil contamination, which introduces the mesh plate into the cover, thereby creating a slightly positive pressure state inside the cover. The sealing mechanism is located inside the cover. The double-lip reverse design of the lip plate makes the contact pressure with the motor output shaft more uniform under the action of slightly positive pressure. At the same time, the positive pressure can reduce the negative pressure collapse phenomenon of the lip plate, ensure that the grease is evenly distributed in the lip plate position, maintain the integrity of the oil film seal, and extend the service life of the sealing mechanism. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the rear side of the structure of the present invention; Figure 3 This is a schematic diagram of the interception component of the present invention; Figure 4 This is a schematic diagram of the interception mechanism of the present invention; Figure 5 This is a side plan view of the interception mechanism of the present invention; Figure 6 This is a schematic diagram of the mesh structure of the present invention; Figure 7 This is a side plan view of the mesh structure of the present invention; Figure 8 This is a schematic diagram of the scraper mechanism of the present invention; Figure 9This is a schematic diagram of the sealing mechanism of the present invention; Figure 10 For the present invention Figure 9 Enlarged view of point A; Figure 11 This is a schematic diagram of the casing of the present invention; Figure 12 This is a schematic diagram of the heat dissipation mechanism of the present invention; Figure 13 This is a planar schematic diagram of the heat dissipation mechanism of the present invention.

[0023] In the diagram: 1. Interception mechanism; 101. Main cylinder; 102. Tail cylinder; 103. Shaft cylinder; 104. Reverse rotation blade; 105. Suction blade; 106. Head cylinder; 107. Oil collection edge; 108. Oil leakage hole; 109. Slot; 2. Surface mesh mechanism; 201. Mesh surface; 202. Locking block; 3. Scraper mechanism; 301. Collar; 302. Scraper; 4. Sealing mechanism; 401. Sealing 402. Cylinder; 403. Sealing block; 404. Lip plate; 405. Plate frame; 406. Spring ring; 407. Stepped groove; 408. Snap-on cover; 409. Bearing ring; 5. Cover; 600. Heat dissipation mechanism; 601. Mesh plate; 602. Retaining plate; 603. Screw; 604. Knob; 605. Rod head; 606. Heat dissipation chamber; 607. Base plate; 608. Vent; 609. Thermal pad. Detailed Implementation

[0024] 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.

[0025] Example: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 11 A sealed range hood motor protection device for preventing oil contamination includes an interception component and a sealing mechanism 4 installed on the motor output shaft, with the interception component close to the range hood impeller; The interception assembly includes an interception mechanism 1, which includes a main cylinder 101. A tail cylinder 102 is fixedly attached to the side of the main cylinder 101 away from the impeller of the range hood. The end of the tail cylinder 102 away from the main cylinder 101 is inwardly tapered. A shaft cylinder 103 is provided at the central axis of the main cylinder 101 and is fixedly sleeved to the output shaft of the motor. The shaft cylinder 103 passes through and is fixedly connected to the tail cylinder 102. Anti-rotation blades 104 are fixedly connected at equal intervals between the main cylinder 101 and the shaft cylinder 103. A head cylinder 106 is fixedly connected to the side of the main cylinder 101 near the impeller of the range hood. The end of the head cylinder 106 away from the main cylinder 101 is extended outward. An oil collecting edge 107 is fixedly connected to the extended end of the head cylinder 106. Inclined oil leakage holes 108 are evenly and equidistantly opened through the oil collecting edge 107. A slot 109 is evenly and equidistantly opened on the inner wall of the end of the head cylinder 106 near the main cylinder 101. The radius of the outer expansion end of the head unit 106 is larger than the radius of the range hood impeller; The head tube 106 is internally fitted with a mesh mechanism 2; The outer sides of the interception component and the sealing mechanism 4 are jointly covered by a cover 5 installed on the inner wall of the range hood.

[0026] Please see Figure 4 , Figure 5 Suction blades 105 are fixedly connected at equal intervals on the outer side of the tail tube 102.

[0027] Please see Figure 6 , Figure 7 , Figure 8 The mesh structure 2 includes a mesh 201 adapted to connect to the shaft cylinder 103. The middle part of the mesh 201 protrudes towards the main cylinder 101, and the outer side of the mesh 201 is equidistantly and evenly fixedly connected with a card block 202 adapted to the insertion slot 109.

[0028] A scraper mechanism 3 is provided on the side of the mesh mechanism 2 away from the main cylinder 101. The scraper mechanism 3 includes a collar 301 that is movably connected to the shaft cylinder 103. A scraper 302 that fits the mesh surface 201 is fixedly connected to the outside of the collar 301.

[0029] Please see Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 The sealing mechanism 4 includes a sealing cylinder 401 that is fixedly connected to the motor tailstock. A sealing block 402 is fixedly embedded in the sealing cylinder 401. A plate frame 404 with an internal skeleton is fixedly embedded in the sealing block 402. The plate frame 404 has a T-shaped cross section. The inner end of the plate frame 404 extends to both sides with lip plates 403 that fit the motor output shaft. A spring ring 405 is sleeved on the outer side of each lip plate 403. The sealing cylinder 401 has stepped grooves 406 on both sides of its end face. Each stepped groove 406 has a snap-fit ​​cover 407 that fits the sealing block 402. The middle of the snap-fit ​​cover 407 is fitted with a bearing ring 408 that fits the motor output shaft.

[0030] The main tube 101 is movably inserted through the end wall of the cover 5.

[0031] The port of the cover 5 is provided with a heat dissipation mechanism 6 for heat dissipation; The heat dissipation mechanism 6 includes a mesh plate 601 with a fixed embedded cover 5 port, and the mesh plate 601 is sleeved with a sealing cylinder 401; The outer side of the mesh plate 601 is provided with a heat dissipation assembly for connecting the motor tailstock. The heat dissipation assembly includes ring-shaped retaining plates 602. Each retaining plate 602 has a screw 603 threaded through the center of its surface. A knob 604 is fixedly connected to the outer end of the screw 603, and a rod head 605 that fits the motor tailstock is fixedly connected to the inner end of the screw 603. Adjacent retaining plates 602 are fixedly connected to heat dissipation chambers 606 with built-in cooling liquid. Each heat dissipation chamber 606 has a substrate 607 fixedly connected to its outer side at equal intervals. The free end of the substrate 607 is tilted toward the mesh plate 601. Each substrate 607 has vent holes 608 evenly spaced through its bottom. The vent holes 608 on adjacent substrates 607 are staggered. A thermal pad 609 is inserted between the heat dissipation chamber 606 and the motor tailstock. The thermal pad 609 is made of thermally conductive material. Both the retaining plate 602 and the heat dissipation chamber 606 are fixedly connected to the mesh plate 601.

[0032] The working principle of this invention is as follows: An interception mechanism 1 is set between the motor base and the range hood impeller to intercept most of the oil fumes moving toward the motor. The shaft sleeve 103 is fixedly sleeved on the motor output shaft, which in turn drives the anti-rotation blades 104 to rotate and guide the airflow toward the range hood impeller, causing the oil fumes moving toward the motor side to rebound toward the impeller, reducing the amount of oil fumes escaping toward the motor.

[0033] The mesh structure 2 serves as an interception barrier inside the interception mechanism 1, which can specifically block oil fume pollutants of different particle sizes, reducing the direct contact between the anti-rotating blade 104 and oil from the source. The mesh 201 is a honeycomb mesh, which can intercept large oil fume particles, with only a very small number of oil mists able to penetrate, directly intercepting oil fume particles and significantly reducing the oil contact load on the anti-rotating blade 104.

[0034] The honeycomb mesh of the mesh 201 can disperse and soften the airflow blown towards the impeller of the range hood by the rotating blades 104. It can cut the turbulent airflow into countless small and uniform sub-airflows. The rectification effect of the mesh 201 eliminates eddies, allowing the airflow to flow smoothly towards the impeller in a laminar state. The softened airflow can make the oil fume particles evenly distributed in the head cylinder 106. The impact of the uniform airflow on the impeller is more gentle, avoiding the impeller being unbalanced due to uneven airflow, reducing the problem of excessive oil adhesion in some parts of the impeller, and indirectly reducing the frequency of impeller cleaning.

[0035] The mesh surface 201 is engaged with the head cylinder 106 via the locking block 202 and the locking groove 109 and rotates with it. The collar 301 is movably sleeved on the shaft cylinder 103, which causes a rotational displacement between the mesh surface 201 and the scraper 302. This allows the scraper 302 to clean and remove the oil mist particles accumulated on the mesh surface 201, thus cleaning the mesh surface mechanism 2 in a timely manner and improving the sustainable working capacity of the mesh surface mechanism 2.

[0036] The large amount of oil intercepted by the mesh mechanism 2 moves along the convex surface of the mesh 201 and the inner surface of the head cylinder 106. Under the rotation of the interception mechanism 1, the oil is pushed towards the oil collection edge 107 by centrifugal force, and then guided back to the range hood impeller through the oil leakage hole 108. Finally, the intercepted and accumulated oil is discharged through the range hood's own oil outlet, avoiding secondary pollution of the oil and waste of collected oil resources, and improving the efficiency of directional oil recovery.

[0037] The mesh mechanism 2 is fixed in place by connecting the collar 301 and the shaft cylinder 103. After working for a period of time, the mesh mechanism 2 can be taken out for replacement or cleaning by disassembling the scraper mechanism 3, which significantly improves the convenience of maintenance.

[0038] A sealing mechanism 4 is set between the motor tailstock and the interception assembly. A plate frame 404 with an internal skeleton is fixedly embedded in the sealing block 402. The plate frame 404 has a T-shaped cross section. The inner end of the plate frame 404 extends to both sides with lip plates 403 that fit the output shaft of the motor. A spring ring 405 is sleeved on the outer side of each lip plate 403. The lip plate 403 adopts a double-lip reverse design. The side near the impeller is a dustproof lip that intercepts solid impurities and large oil droplets. The side near the motor is a sealing lip filled with food-grade high-temperature grease to form an oil film seal. This achieves graded and precise interception, blocks the intrusion of pollutants of various forms into the motor, and improves the performance of preventing oil stain intrusion.

[0039] The heat dissipation component controls the position of the screw 603 by rotating the knob 604 to complete the connection with the tailstock of various types of motors. The heat dissipation chamber 606 absorbs a large amount of heat generated by the motor tailstock through the heat-conducting pad 609, and then dissipates it through the substrate 607 connected to the heat dissipation chamber 606. At the same time, the air intake blades 105 uniformly fixed on the outside of the tail cylinder 102 guide the airflow through the mesh plate 601 into the inside of the cover 5, thereby guiding the external airflow over the substrate 607, thereby increasing the contact rate between the substrate 607 and the air, and further improving the heat dissipation effect.

[0040] The suction blades 105, which rotate with the tail cylinder 102, introduce external airflow into the housing 5 through the mesh plate 601, thereby creating a slightly positive pressure state inside the housing 5. The sealing mechanism 4 is located inside the housing 5. Under the action of slightly positive pressure, the double-lip reverse design of the lip plate 403 makes the contact pressure with the motor output shaft more uniform. At the same time, the positive pressure can reduce the negative pressure collapse phenomenon of the lip plate 403, ensure that the grease is evenly distributed at the position of the lip plate 403, maintain the integrity of the oil film seal, and extend the service life of the sealing mechanism 4.

[0041] 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 sealed range hood motor protection device for preventing oil contamination, comprising an interception component and a sealing mechanism (4) mounted on the motor output shaft, wherein the interception component is close to the range hood impeller; The interception component includes an interception mechanism (1), the interception mechanism (1) includes a main tube (101), characterized in that: The main cylinder (101) is fixedly covered with a tail cylinder (102) on the side away from the impeller of the range hood. The end of the tail cylinder (102) away from the main cylinder (101) is tapered inward. A shaft cylinder (103) is fixedly sleeved on the central axis of the main cylinder (101) to connect the output shaft of the motor. The shaft cylinder (103) passes through and is fixedly connected to the tail cylinder (102). Reverse rotation blades (104) are fixedly connected at equal intervals between the main cylinder (101) and the shaft cylinder (103). The main cylinder (101) is fixedly connected to a head cylinder (106) on the side near the impeller of the range hood. The head cylinder (106) is extended outward at the end away from the main cylinder (101). An oil collecting edge (107) is fixedly connected to the extended end of the head cylinder (106). Inclined oil leakage holes (108) are evenly and equidistantly opened on the oil collecting edge (107). The inner wall of the head cylinder (106) near the main cylinder (101) is evenly and equidistantly opened with slots (109). The head tube (106) is fitted with a mesh mechanism (2); The outer sides of the interception component and the sealing mechanism (4) are jointly covered by a cover (5) installed on the inner wall of the range hood.

2. The sealed range hood motor protection device for preventing oil contamination as described in claim 1, characterized in that: Suction blades (105) are fixedly connected at equal intervals on the outer side of the tail tube (102).

3. The sealed range hood motor protection device for preventing oil contamination as described in claim 1, characterized in that: The mesh mechanism (2) includes a mesh (201) adapted to connect to the shaft cylinder (103). The middle part of the mesh (201) protrudes towards the main cylinder (101), and the outer side of the mesh (201) is uniformly and equidistantly connected with a card block (202) adapted to the insertion slot (109).

4. The sealed range hood motor protection device for preventing oil contamination as described in claim 3, characterized in that: The mesh mechanism (2) is provided with a scraper mechanism (3) on the side away from the main cylinder (101). The scraper mechanism (3) includes a collar (301) that is movably connected to the shaft cylinder (103). A scraper (302) that fits the mesh surface (201) is fixedly connected to the outside of the collar (301).

5. A sealed range hood motor protection device for preventing oil contamination as described in claim 1, characterized in that: The sealing mechanism (4) includes a sealing cylinder (401) fixedly connected to the motor tailstock. A sealing block (402) is fixedly embedded in the sealing cylinder (401). A plate frame (404) with an internal skeleton is fixedly embedded in the sealing block (402). The plate frame (404) has a T-shaped cross section. The inner end of the plate frame (404) extends to both sides with lip plates (403) that fit the motor output shaft. A spring ring (405) is sleeved on the outer side of each lip plate (403). The sealing cylinder (401) has stepped grooves (406) on both sides. Each stepped groove (406) has a snap-fit ​​cover (407) that fits the sealing block (402) and is fixedly fastened in the middle of the snap-fit ​​cover (407). A bearing ring (408) that fits the motor output shaft is embedded in the middle of the snap-fit ​​cover (407).

6. A sealed range hood motor protection device for preventing oil contamination as described in claim 5, characterized in that: The main cylinder (101) is movably inserted through the end wall of the cover (5).

7. A sealed range hood motor protection device for preventing oil contamination as described in claim 6, characterized in that: The port of the cover (5) is provided with a heat dissipation mechanism (6) for heat dissipation. The heat dissipation mechanism (6) includes a mesh plate (601) with a fixed embedded cover (5) port, and the mesh plate (601) is fitted with a sealing cylinder (401). The outer side of the mesh plate (601) is provided with a heat dissipation assembly for connecting the motor tailstock. The heat dissipation assembly includes ring-shaped retaining plates (602). A screw (603) is threaded through the center of the surface of each retaining plate (602). A knob (604) is fixedly connected to the outer end of the screw (603), and a rod head (605) that fits the motor tailstock is fixedly connected to the inner end of the screw (603). Adjacent retaining plates (602) are fixedly connected to heat dissipation chambers (606) with built-in cooling liquid. Each heat dissipation chamber (606) has a substrate (607) fixedly connected to its outer side at equal intervals. The free end of the substrate (607) is tilted toward the mesh plate (601). Each substrate (607) has vent holes (608) evenly and at equal intervals through its bottom. The vent holes (608) on adjacent substrates (607) are staggered. A thermal pad (609) is inserted between the heat dissipation chamber (606) and the motor tailstock. The retaining plate (602) and the heat dissipation chamber (606) are both fixedly connected to the mesh plate (601).

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