Range hood

Abstract

The utility model relates to the technical field of range hoods, and discloses a range hood, which comprises a range hood main body provided with a smoke collecting cavity and an exhaust inlet communicated with the smoke collecting cavity, a smoke exhaust fan is arranged in the smoke collecting cavity, and a main oil path is formed by a path of oil flowing in the smoke collecting cavity and flowing out of the smoke collecting cavity; the back plate assembly is connected to the rear side of the range hood body, and an auxiliary oil way is formed by the path, flowing out of the back plate assembly, of oil liquid; when the smoke exhaust fan runs, the main oil way is closed, and when the smoke exhaust fan stops running, the main oil way is opened, and the auxiliary oil way is in a normally open state. Compared with the prior art, when the range hood and the smoke exhaust fan operate, oil smoke in the smoke collecting cavity is sucked and exhausted outwards, at the moment, due to the fact that the main oil way is closed, external oil smoke cannot enter the smoke collecting cavity through the outlet of the main oil way, noise generated when the range hood operates can be reduced, and the service life of the range hood is prolonged. And no air flow enters the smoke collecting cavity through the outlet of the main oil way, so that no air flow blows up the oil collected at the bottom of the smoke collecting cavity, and the oil is prevented from splashing.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, and specifically, to a range hood. Background Art

[0002] For current range hoods, in order to overcome the exhaust resistance, the static pressure of the fan is made larger and larger. When the range hood is working, the negative pressure in the smoke collecting cavity air duct is very high. Under the action of the negative pressure, when the cooking fumes generated by the user flow into the smoke collecting cavity, a part of the fumes will enter the smoke collecting cavity through the oil leakage holes. When the fumes enter the smoke collecting cavity through the oil leakage holes, the air flow in the smoke collecting cavity air duct will be disturbed, resulting in greater energy loss and higher aerodynamic noise. Especially for the top-suction range hood, since both the oil leakage holes and the air suction openings are provided on the top plate of the range hood main body, when the fumes enter the air collecting cavity through the oil leakage holes, the air flow velocity is very high, which will not only generate higher aerodynamic noise, but also drive the fumes at the bottom of the smoke collecting cavity upward when the air flow enters the smoke collecting cavity through the oil leakage holes, causing the oil liquid to splash upward and polluting the entire smoke collecting cavity, and there is also a risk of splashing out from the air suction opening. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a range hood, which is used to solve the above technical problems.

[0004] A range hood includes:

[0005] A range hood main body, which has a smoke collecting cavity and an air suction opening communicating with the smoke collecting cavity. A smoke exhaust fan is arranged in the smoke collecting cavity, and the path of the oil liquid flowing in the smoke collecting cavity and flowing out of the smoke collecting cavity forms a main oil path;

[0006] A back panel assembly, which is connected to the rear side of the range hood main body, and the path of the oil liquid flowing out along the back panel assembly forms a secondary oil path;

[0007] Wherein, when the smoke exhaust fan is running, the main oil path is closed, and when the smoke exhaust fan stops running, the main oil path is opened, and the secondary oil path is in an always-open state.

[0008] According to an embodiment of the utility model, the range hood main body has a suction panel, on which the air suction opening is arranged, and an oil guiding hole communicating with the smoke collecting cavity is also arranged on the suction panel. The oil guiding hole forms the outlet of the main oil path. When the smoke exhaust fan is running, the oil guiding hole is closed, and when the smoke exhaust fan stops running, the oil guiding hole is opened.

[0009] According to an embodiment of the present utility model, a switching valve assembly is connected to the oil guiding hole. The switching valve assembly has a force-receiving part. When the force-receiving part is not stressed or is subjected to a force towards the outside of the smoke collecting cavity, the switching valve assembly is in a state of opening the oil guiding hole. When the force-receiving part is subjected to a force towards the smoke collecting cavity, the switching valve assembly closes. When the smoke exhaust fan is operating, the air pressure difference inside and outside the smoke collecting cavity causes the force-receiving part to be subjected to a force towards the smoke collecting cavity, and the switching valve assembly closes the oil guiding hole. After the smoke exhaust fan stops operating, when the oil in the main oil path flows out through the oil guiding hole and acts on the force-receiving part, the force-receiving part is subjected to a force towards the outside of the smoke collecting cavity, and the switching valve assembly opens the oil guiding hole.

[0010] According to an embodiment of the present utility model, the switching valve assembly includes a valve body, a valve core, and a spring. The valve body has a diversion channel that penetrates the valve body and forms an oil leakage hole on the upper end surface of the valve body. The valve core is slidably connected to the diversion channel. The valve core forms the force-receiving part of the switching valve assembly. The spring is disposed below the valve core and supports the valve core. When the force-receiving part is not stressed, the spring is in a freely extended state, and the valve core opens the oil guiding hole. When the valve core is subjected to a force towards the smoke collecting cavity, the valve core closes the oil guiding hole. After the smoke exhaust fan stops operating, when the oil in the main oil path flows out through the oil guiding hole and acts on the valve core, the valve core moves downward under the action of the oil to compress the spring and opens the oil guiding hole.

[0011] According to an embodiment of the present utility model, the valve body further has a guiding channel that is sleeved in the diversion channel and is connected to the inner wall surface of the diversion channel through a connecting rib. The valve core has a valve head and a valve stem connected below the valve head. The valve stem is sleeved in the guiding channel. The spring is sleeved on the valve stem and is located between the valve head and the upper end surface of the guiding channel. The upper surface of the valve head is arc-shaped, and its cross-sectional area is larger than the area of the oil leakage hole.

[0012] According to an embodiment of the present utility model, it further includes a main oil cup that is connected to the smoke machine main body and is used for receiving the oil discharged from the main oil path; the main oil cup is communicated with the secondary oil path.

[0013] According to an embodiment of the present utility model, the back plate assembly includes a front plate facing the user side and a back plate located behind the front plate. The back plate is connected to the smoke machine main body, the front plate is connected to the back plate, and an oil guiding cavity is formed between the front plate and the back plate. The oil guiding cavity is communicated with the main oil path. The path of the oil flowing along the oil guiding cavity and the path of the oil flowing along the front plate form a secondary oil path.

[0014] According to an embodiment of the present utility model, an oil guiding member is provided at the upper edge of the front plate. The oil guiding member has an oil guiding groove. The oil inlet of the oil guiding groove is communicated with the main oil path, and the oil outlet of the oil guiding groove is communicated with the oil guiding cavity.

[0015] According to an embodiment of the present utility model, it further includes a main oil cup that is connected to the smoke machine main body and is used for receiving the oil discharged from the main oil path. The bottom surface of the main oil cup is inclined downward from front to back, and at least the projection of the rear edge of the bottom surface of the main oil cup downward falls into the oil guiding groove.

[0016] According to an embodiment of the present utility model, it further includes a secondary oil cup, which is connected below the back plate or the front plate. The downward projection of the lower edge of the front plate falls into the secondary oil cup, and the downward projection of the oil outlet hole of the oil guiding cavity falls into the secondary oil cup. The secondary oil cup is used to receive the oil discharged from the secondary oil circuit.

[0017] Compared with the prior art, the range hood of the present utility model has the following advantages:

[0018] In the range hood of the present utility model, when the exhaust fan operates, it sucks the oil fume in the smoke collection cavity and discharges it outward, creating a negative pressure in the smoke collection cavity. Under the action of the negative pressure, the oil fume generated by the user during cooking enters the smoke collection cavity through the air suction port and is discharged by the exhaust fan. At this time, since the main oil circuit is closed, the external oil fume cannot enter the smoke collection cavity through the outlet of the main oil circuit, which can reduce the noise during the operation of the range hood, and there will be no airflow blowing the oil liquid collected at the bottom of the smoke collection cavity upward through the outlet of the main oil circuit, avoiding oil splashing; when the exhaust fan operates, the secondary oil circuit is in an open state, and the oil liquid generated at the back plate assembly by the oil fume can still be discharged from the back plate assembly along the secondary oil circuit; after the exhaust fan stops operating, the main oil circuit is opened, and the oil fume in the smoke collection cavity flows along the main oil circuit and is collected at the bottom of the smoke collection cavity, and then is discharged through the outlet of the main oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the range hood of the present utility model;

[0020] Figure 2 is a sectional view of the range hood of the present utility model;

[0021] Figure 3 is Figure 2 an enlarged view of A in

[0022] Figure 4 is a schematic structural diagram of the switching valve assembly;

[0023] Figure 5 is an exploded view of the switching valve assembly;

[0024] In the figure: 1. Range hood main body, 11. Smoke collection cavity, 12. Exhaust fan, 13. Air suction panel, 131. Air suction port, 2. Back plate assembly, 21. Front plate, 22. Back plate, 23. Oil guiding cavity, 24. Oil guiding member, 241. Oil guiding groove, 25. Oil guiding plate, 3. Switching valve assembly, 31. Valve body, 31a. Valve end cover, 31b. Valve base, 311. Flow guiding channel, 312. Oil leakage hole, 313. Guiding channel, 314. Buckle, 32. Valve core, 321. Valve head, 322. Valve rod, 33. Spring, 4. Main oil cup, 5. Secondary oil cup

[0025] The implementation and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific Embodiments

[0026] The following will disclose multiple embodiments of the present utility model in the form of diagrams. For the sake of clarity, many practical details will be described together in the following narrative. However, it should be understood that these practical details are not used to limit the present utility model. That is to say, in some embodiments of the present utility model, these practical details are not necessary. In addition, for the purpose of simplifying the diagrams, some well-known and commonly used structures and components will be shown in a simple schematic manner in the diagrams.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0028] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the order or sequence. Nor are they used to limit the present utility model. They are merely used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0029] To further understand the content, features, and effects of the present utility model, the following embodiments are exemplified and described in detail with reference to the accompanying drawings as follows:

[0030] Please refer to Figures 1 to 3, the present utility model discloses a range hood. The range hood disclosed by the present utility model includes a range hood main body 1 and a back plate assembly 2. The range hood main body 1 has a smoke collecting cavity 11 and an air suction port 131 communicating with the smoke collecting cavity 11. A smoke exhaust fan 12 is provided in the smoke collecting cavity 11. The path along which the oil liquid flows in the smoke collecting cavity 11 and flows out of the smoke collecting cavity 11 forms a main oil path; the back plate assembly 2 is connected to the rear side of the range hood main body 1, and the path along which the oil liquid flows out along the back plate assembly 2 forms a secondary oil path; wherein, when the smoke exhaust fan 12 operates, the main oil path is closed, and when the smoke exhaust fan 12 stops operating, the main oil path is opened, and the secondary oil path is in an always-open state. In the range hood of the present utility model, when the user performs cooking operations, the range hood is started, and the smoke exhaust fan 12 operates. The smoke exhaust fan 12 sucks the cooking fumes in the smoke collecting cavity 11 and discharges them outwards, causing a negative pressure to be formed in the smoke collecting cavity 11. Under the action of the negative pressure, the cooking fumes generated by the user enter the smoke collecting cavity 11 through the air suction port 131 and are discharged by the smoke exhaust fan 12. At this time, since the main oil path is closed, the external cooking fumes cannot enter the smoke collecting cavity 11 through the outlet of the main oil path, which can reduce the noise during the operation of the range hood, and there will be no air flow entering the smoke collecting cavity 11 through the outlet of the main oil path, so there will be no air flow blowing up the oil liquid accumulated at the bottom of the smoke collecting cavity 11, preventing the oil liquid from splashing; when the smoke exhaust fan 12 operates, the secondary oil path is in an open state, and the oil liquid generated by the cooking fumes at the back plate assembly 2 can still flow out along the secondary oil path from the back plate assembly 2; after the smoke exhaust fan 12 stops operating, the main oil path is opened, and the oil liquid generated in the smoke collecting cavity 11 flows along the main oil path and accumulates at the bottom of the smoke collecting cavity 11, and then is discharged through the outlet of the main oil path.

[0031] In the present utility model, the flow path of the oil liquid on the volute of the smoke exhaust fan 12 flowing to the bottom of the smoke collecting cavity 11 and the path of the oil liquid on the wall surface of the smoke collecting cavity 11 flowing to the bottom of the smoke collecting cavity 11 both belong to the main oil path, and the oil liquid in the smoke collecting cavity 11 and the oil liquid on the volute of the smoke exhaust fan 12 are both discharged from the smoke collecting cavity 11 through the same outlet.

[0032] Please refer to Figure 1 and Figure 2 , for the range hood of the present utility model, the range hood main body 1 has an air suction panel 13. The air suction panel 13 is provided with an air suction port 131, and the air suction panel 13 is also provided with an oil guiding hole communicating with the smoke collecting cavity 11. The oil guiding hole forms the outlet of the main oil path. When the smoke exhaust fan 12 operates, the oil guiding hole is closed, and when the smoke exhaust fan 12 stops operating, the oil guiding hole is opened. When the smoke exhaust fan 12 operates, the negative pressure formed by the smoke exhaust fan 12 in the smoke collecting cavity 11 causes the cooking fumes generated by the user to flow into the smoke collecting cavity 11 through the air suction port 131. At the same time, since the oil guiding hole is closed, there will be no air flow entering the smoke collecting cavity 11 through the oil guiding hole, which will not only not reduce the negative pressure formed by the smoke exhaust fan 12 at the air suction port 131, preventing the power of the smoke exhaust fan 12 from being wasted, but also there will be no air flow entering the smoke collecting cavity 11 through the oil guiding hole to blow up the oil liquid in the smoke collecting cavity 11, avoiding the oil liquid from splashing.

[0033] Please refer to Figures 1 to 3 For the range hood of the present utility model, a switching valve assembly 3 is connected at the oil guiding hole. The switching valve assembly 3 has a force-receiving part. When the force-receiving part is not stressed or receives a force directed outside the smoke collecting cavity 11, the switching valve assembly 3 is in a state of opening the oil guiding hole. When the force-receiving part receives a force directed towards the smoke collecting cavity 11, the switching valve assembly 3 closes. When the exhaust fan 12 operates, the air pressure difference inside and outside the smoke collecting cavity 11 causes the force-receiving part to receive a force directed towards the smoke collecting cavity 11, and the switching valve assembly 3 closes the oil guiding hole. After the exhaust fan 12 stops operating, when the oil in the main oil path flows out through the oil guiding hole and acts on the force-receiving part, the force-receiving part receives a force directed outside the smoke collecting cavity 11, and the switching valve assembly 3 opens the oil guiding hole. When the exhaust fan 12 is closed, if there is no oil in the main oil path flowing out through the oil guiding hole, the force-receiving part of the switching valve assembly 3 is not stressed, and at this time the switching valve assembly 3 is in a state of opening the oil guiding hole; when the exhaust fan 12 operates, the exhaust fan 12 forms a negative pressure in the smoke collecting cavity 11, and the air pressure difference on both sides of the oil guiding hole causes the force-receiving part of the switching valve assembly 3 to receive a force directed towards the smoke collecting cavity 11, and the switching valve assembly 3 will be in a state of closing the oil guiding hole. At this time, the cooking fumes flow into the smoke collecting cavity 11 through the air suction port 131. However, since the switching valve assembly 3 closes the oil guiding hole, no air flow will enter the smoke collecting cavity through the oil guiding hole. When the oil generated during the process of the cooking fumes being discharged from the smoke collecting cavity 11 accumulates at the bottom of the smoke collecting cavity 11, it will not be driven upward by the air flow.

[0034] Please refer to Figure 4 and Figure 5, for the range hood of the present utility model, the switching valve assembly 3 includes a valve body 31, a valve core 32 and a spring 33. The valve body 31 has a diversion channel 311, and the diversion channel 311 penetrates through the valve body 31 and forms an oil leakage hole 312 on the upper end surface of the valve body 31. The valve core 32 is slidably connected within the diversion channel 311. The valve core 32 forms the force-receiving part of the switching valve assembly 3. The spring 33 is disposed below the valve core 32 and supports the valve core 32. When the force-receiving part is not stressed, the spring 33 is in a free extension state, and the valve core 32 opens the oil guiding hole. When the valve core 32 receives a force towards the smoke collecting cavity 11, the valve core 32 closes the oil guiding hole. After the exhaust fan 12 stops operating, when the oil in the main oil path flows out through the oil guiding hole and acts on the valve core 32, the valve core 32 moves downward under the action of the oil, compresses the spring 33 and opens the oil guiding hole. For the range hood of the present utility model, when the exhaust fan 12 is operating, the exhaust fan 12 forms a negative pressure in the smoke collecting cavity 11. The air pressure in the smoke collecting cavity 11 is less than the external air pressure. The external air flow will flow into the smoke collecting cavity 11 through the diversion channel 311 of the switching valve assembly 3. After contacting the valve core 32 of the switching valve assembly 3, a force towards the smoke collecting cavity 11 is applied to the valve core 32. The valve core 32 moves upward along the diversion channel 311 and closes the oil guiding hole. After the exhaust fan 12 stops operating, the air pressure in the smoke collecting cavity 11 is equal to the external air pressure. The force acting on the valve core 32 towards the smoke collecting cavity 11 disappears. Under the action of gravity, the valve core 32 resets and opens the oil leakage hole 312. The oil in the smoke collecting cavity 11 can be discharged through the diversion channel 311. During the process of the oil discharging through the oil guiding hole, the oil drops onto the upper end surface of the valve core 32, applying a downward pressure to the valve core 32. The valve core 32 continues to descend under the action of the oil and compresses the spring 33. After all the oil in the main oil path has been discharged through the diversion channel 311, the force acting on the valve core 32 by the oil disappears, the spring 33 resets, and the valve core 32 is pushed upward by the spring 33 to its initial state.

[0035] The initial state of the valve core 32 is a state where neither the side of the valve core 32 facing the smoke collecting cavity 11 nor the side facing away from the smoke collecting cavity 11 is stressed. In this state, the valve core 32 is supported by the spring 33 and does not close the oil guiding hole; setting the initial state of the valve core 32 to a state where the spring 33 can support the valve core 32 without undergoing elastic deformation and the valve core 32 does not close the oil guiding hole can prevent the spring 33 from being stressed for a long time and reduce its performance, and can also enable the oil in the main oil path to be easily discharged through the oil guiding hole.

[0036] Please refer to Figure 4 and Figure 5, for the range hood of the present utility model, the valve body 31 further has a guiding channel 313. The guiding channel 313 is sleeved inside the diversion channel 311 and is connected to the inner wall surface of the diversion channel 311 through connecting ribs. The valve core 32 has a valve head 321 and a valve stem 322 connected below the valve head 321. The valve stem 322 is sleeved inside the guiding channel 313. The spring 33 is sleeved on the valve stem 322 and is located between the valve head 321 and the upper end surface of the guiding channel 313. The upper surface of the valve head 321 is arc-shaped and its cross-sectional area is larger than the area of the oil leakage hole 312. For the range hood of the present utility model, when the exhaust fan 12 operates, a negative pressure is formed in the smoke collecting cavity 11 by the exhaust fan 12. The cooking fumes generated by the user will flow into the smoke collecting cavity 11. Since the oil guiding hole is communicated with the smoke collecting cavity 11, the negative pressure at the oil guiding hole is also very large, and it will suck the external fumes through the switching valve assembly 3. When the external fumes flow through the diversion channel 311 of the switching valve assembly 3, a force towards the smoke collecting cavity 11 will be applied to the valve core 32. The valve core 32 moves upward under the push of the air flow. The valve head 321 of the valve core 32 abuts against the upper end surface of the diversion channel 311 of the valve body 31 and seals the opening. The external fumes cannot enter the smoke collecting cavity 11 through the diversion channel 311, and the air flow will not pass through the opening to impact the oil liquid in the smoke collecting cavity 11, avoiding the splashing of the oil liquid. When the exhaust fan 12 stops operating, the air pressure in the smoke collecting cavity 11 is balanced with the external air pressure. When the force on the valve core 32 towards the inside of the smoke collecting cavity 11 is small, the valve core 32 moves downward under the action of gravity and is supported by the spring 33. The valve head 321 leaves the upper end surface of the valve body 31 and opens the opening on the upper end surface of the valve body 31. The oil liquid in the smoke collecting cavity 11 can enter the diversion channel 311 through the opening and be discharged.

[0037] Please refer to Figure 4 and Figure 5 , for the range hood of the present utility model, the valve body 31 includes a valve end cover 31a and a valve base 31b. The valve end cover 31a and the valve base 31b are respectively located inside and outside the smoke collecting cavity 11. The valve end cover 31a has a connecting section, and the upper end of the valve base 31b is sleeved inside the cavity of the connecting section. For the range hood of the present utility model, the valve body 31 is divided into the valve end cover 31a and the valve base 31b, and the valve end cover 31a and the valve base 31b are detachably connected. This not only facilitates the installation of the valve core 32 and the spring 33 into the valve body 31, but also during long-term use, if the valve core 32 needs to be repaired or replaced, the valve base 31b can be directly removed from the valve end cover 31a from the outside of the smoke collecting cavity 11 to replace or repair the valve core 32.

[0038] Please refer to Figure 4 and Figure 5, for the range hood of the present utility model, a connection hole is provided on the smoke collecting cavity 11. The outer diameter of the connection section of the valve end cover 31a is adapted to the connection hole, and a buckle 314 is provided on the outer wall surface of the connection section. When the connection section passes through the connection hole, the buckle 314 is clamped to the connection hole. When installing the switch valve assembly 3, the valve end cover 31a is installed downward from above the smoke collecting cavity 11, so that the connection section of the valve end cover 31a passes through the connection hole. When the upper edge of the buckle 314 on the connection section passes through the connection hole and the lower surface of the valve end cover 31a abuts against the lower surface of the smoke collecting cavity 11, the valve end cover 31a is installed in place. The buckle 314 limits the valve end cover 31a, so that the valve end cover 31a cannot move up and down along the connection hole, and the part of the valve end cover 31a located in the smoke collecting cavity 11 can seal the connection hole, avoiding the oil liquid in the smoke collecting cavity 11 from flowing out through the gap between the connection hole and the connection section, and also avoiding the external air flow from flowing into the smoke collecting cavity 11 through the gap between the connection hole and the connection section when the exhaust fan 12 is running.

[0039] Please refer to Figures 1 to 3 , the range hood of the present utility model further includes a main oil cup 4, which is connected to the range hood main body 1 and is used for receiving the oil liquid discharged from the main oil path; the main oil cup 4 is communicated with the secondary oil path. When the exhaust fan 12 is running, the switch valve assembly 3 closes the outlet of the main oil path, and the main oil path is closed. When the cooking fume enters the smoke collecting cavity 11 through the air suction port 131, oil liquid will adhere to and accumulate on the surface of the main oil cup 4. The oil liquid accumulated on the surface of the main oil cup 4 can enter the secondary oil path and then be discharged through the secondary oil path, avoiding the oil liquid generated on the surface of the main oil cup 4 from dripping onto the stove top or falling into the cooked food.

[0040] Please refer to Figure 1 and Figure 3 , for the range hood of the present utility model, the back plate assembly 2 includes a front plate 21 facing the user side and a back plate 22 located behind the front plate 21. The back plate 22 is connected to the range hood main body 1, the front plate 21 is connected to the back plate 22, and an oil guiding cavity 23 is formed between the front plate 21 and the back plate 22. The oil guiding cavity 23 is communicated with the main oil path, and the path of the oil liquid flowing along the oil guiding cavity 23 and the path of the oil liquid flowing along the front plate 21 form a secondary oil path. When the exhaust fan 12 is running, the switch valve assembly 3 closes the outlet of the main oil path, and the main oil path is closed. When the cooking fume enters the smoke collecting cavity 11 through the air suction port 131, oil liquid will adhere to and accumulate on the surface of the main oil cup 4. The oil liquid accumulated on the surface of the main oil cup 4 can flow along the front plate 21 and drip downward along the front plate 21. The oil liquid accumulated on the surface of the main oil cup 4 can also enter the oil guiding cavity 23, flow along the oil guiding cavity 23 and be discharged. When the cooking fume enters the smoke collecting cavity 11 through the air suction port 131, oil liquid will also be generated on the front plate 21. The oil liquid accumulates on the front plate 21, flows along the front plate 21 and drips downward.

[0041] Please refer to Figures 1 to 3, for the range hood of the present utility model, an oil guide member 24 is provided at the upper edge of the front plate 21. The oil guide member 24 has an oil guide groove 241. The oil inlet of the oil guide groove 241 is communicated with the main oil path, and the oil outlet of the oil guide groove 241 is communicated with the oil guide cavity 23. In the case of no main oil cup 4, the oil inlet of the oil guide groove 241 can be directly communicated with the oil outlet of the main oil path, that is, the oil guide hole is aligned with the oil guide groove 241. After the exhaust fan 12 stops running, the oil in the main oil path is discharged through the oil guide hole, then enters the oil guide groove 241, and finally is discharged into the oil guide cavity 23 through the oil outlet of the oil guide groove 241 and discharged along the oil guide cavity 23.

[0042] Please refer to Figures 1 to 3 , in the illustrated embodiment of the range hood, the range hood has a main oil cup 4. The main oil cup 4 is connected to the range hood body 1 and is used to receive the oil discharged from the main oil path. The bottom surface of the main oil cup 4 is inclined downward from front to back, and at least the rear edge of the bottom surface of the main oil cup 4 projects downward into the oil guide groove 241. When the exhaust fan 12 is running, during the process that the oil fume flows towards the air suction port 131 under the action of the exhaust fan 12, at least the front side and the bottom surface of the main oil cup 4 will have oil fume passing by. The mixture of oil and water in the oil fume will adhere to the front side and the bottom surface of the main oil cup 4. When the adhesion reaches a certain amount, the oil on the front side of the main oil cup 4 flows along the front side of the main oil cup 4 to the lower edge of the front side, and then flows along the bottom surface of the main oil cup 4. Since the bottom surface of the main oil cup 4 is inclined from front to back, the oil on the bottom surface of the main oil cup 4 flows backward along its bottom surface and accumulates at the lowest point of the bottom surface of the main oil cup 4. When the oil is sufficient, it drips from the lowest point of the bottom surface of the main oil cup 4 into the oil guide groove 241 of the oil guide member 24. For the range hood of the present utility model, the main oil cup 4 and the oil guide member 24 are provided. The main oil cup 4 receives the oil discharged from the main oil path, and the oil guide member 24 receives the oil dripping from the outer side wall surface of the main oil cup 4, which can prevent the oil droplets hanging on the main oil cup 4 from dripping onto the cooking tabletop. In addition, the oil guide member 24 is located at the upper edge of the front plate 21 and below the main oil cup 4, which can block the gap between the front plate 21 and the main oil cup 4 and make the appearance of the range hood beautiful.

[0043] Please refer to Figures 1 to 3 , for the range hood of the present utility model, the front side wall surface of the oil guide groove 241 is an arc surface, which protrudes into the oil guide groove 241 and makes the upper edge of the front side wall surface of the oil guide groove 241 extend forward. The height of the upper edge of the front side wall surface of the oil guide groove 241 is lower than the lowest point of the main oil cup 4. The front side wall surface of the oil guide groove 241 is set as an arc shape, which can make the appearance of the range hood body 1 beautiful, and the height of the upper edge of the front side wall surface of the oil guide groove 241 is lower than the lowest end of the main oil cup 4, which is convenient for disassembling and assembling the main oil cup 4. When disassembling and assembling the main oil cup 4, the upper edge of the front side wall surface of the oil guide groove 241 will not interfere with the main oil cup 4.

[0044] Please refer to Figure 2 and Figure 3, for the range hood of the present utility model, the lower edge of the arc surface on the front side wall surface of the oil guide groove 241 extends downward to the front side of the front plate 21. The upper edge of the front plate 21 abuts against the bottom surface of the oil guide groove 241, and the lower edge of the arc surface abuts against the front side of the front plate 21. After the front plate 21 is installed in place on the range hood main body 1, the upper edge of the front plate 21 abuts against the bottom surface of the oil guide groove 241, and the lower edge of the oil guide groove 241 adheres to the upper end of the front side of the front plate 21. This can not only make the appearance of the range hood main body 1 beautiful, but also prevent oil fume from entering the rear side of the front plate 21 through the gap between the oil guide member 24 and the upper edge of the front plate 21. For some models of range hoods, the front plate 21 needs to be installed with a lighting device. The lighting device can be installed on the upper edge of the front plate 21 or on the back surface of the front plate 21, so that the lower edge of the front side wall surface of the oil guide groove 241 abuts against the front side of the upper edge of the front plate 21, preventing oil fume from entering the upper edge of the front plate 21 or preventing oil fume from entering the back surface of the front plate 21 through the gap between the upper edge of the front plate 21 and the oil guide member 24, and avoiding contaminating the lighting device.

[0045] Please refer to Figure 2 , for the range hood of the present utility model, an oil guide plate 25 is further provided in the oil guide cavity 23. The oil guide plate 25 is arranged in the oil guide cavity 23. The upper edge of the oil guide plate 25 extends upward to the oil outlet of the oil guide member 24. The lower edge of the oil guide plate 25 is connected to the inner wall surface of the back plate 22. An oil outlet hole is provided at the junction of the lower edge of the oil guide plate 25 and the back plate 22. The oil liquid in the oil guide groove 241 flows downward along the oil guide plate 25 and flows to the part of the inner wall surface of the back plate 22 below the oil guide plate 25 through the oil outlet hole, and then flows along the back plate 22 to the bottom of the oil guide cavity 23. After the oil liquid in the oil guide groove 241 flows out through the oil outlet of the oil guide groove 241, it flows along the oil guide plate 25 and gathers at the bottom of the oil guide plate 25, and then flows out through the oil outlet hole at the junction of the lower edge of the oil guide plate 25 and the back plate 22, flows along the part of the back plate 22 below the oil guide plate 25, and finally gathers in the oil guide cavity 23 and enters the auxiliary oil cup 5 through the oil guide hole at the bottom of the oil guide cavity 23. In the present utility model, the oil guide plate 25 is inclined downward from front to back. After the oil liquid in the oil guide groove 241 flows out of the oil guide groove 241, it flows obliquely downward along the oil guide plate 25. The oil guide plate 25 guides the oil liquid to the back plate 22, preventing the oil liquid from dripping directly from the oil guide plate 25, which will generate noise, and also preventing the oil liquid from adhering to the inner side of the front plate 21.

[0046] Please refer to Figure 1 and Figure 2, the range hood of the present utility model further includes a secondary oil cup 5. The secondary oil cup 5 is connected to the lower part of the back plate 22 or the front plate 21. The downward projection of the lower edge of the front plate 21 falls into the secondary oil cup 5, and the downward projection of the oil outlet hole of the oil guiding cavity 23 falls into the secondary oil cup 5. The secondary oil cup 5 is used to receive the oil discharged from the secondary oil path. After a certain amount of oil accumulates on the outer side wall area of the main oil cup 4, the oil drips from the bottom of the main oil cup 4 into the oil guiding groove 241 of the oil guiding member 24 at the upper end of the front plate 21, and then enters the oil guiding cavity 23 between the front plate 21 and the back plate 22 through the oil outlet of the oil guiding groove 241, and then flows along the oil guiding cavity 23 and converges at the bottom of the oil guiding cavity 23. After converging to a certain amount, it flows out through the oil guiding hole at the bottom of the oil guiding cavity 23 and enters the secondary oil cup 5. When the range hood is working, the speed of oil accumulating on the outer wall surface of the main oil cup 4 is relatively fast. If the oil dripping from the main oil cup 4 flows directly on the front plate 21, it will affect the appearance and reduce the user satisfaction. Therefore, the oil guiding cavity 23 located between the front plate 21 and the back plate 22 is provided, so that the oil accumulated on the outer wall surface of the main oil cup 4 flows through the oil guiding cavity 23, and the user cannot see the flow path of the oil on the outer wall surface of the main oil cup 4, thus improving the appearance of the range hood. When the exhaust fan of the range hood is running, when the oil fume flows obliquely backward from top to bottom towards the air suction port 131, part of the oil fume will flow upward along the front plate 21. During the flow of the oil fume, the oil liquid formed by the mixture of oil and water in the oil fume will also adhere to the front plate 21. After accumulating to a certain amount, it will flow along the front plate 21 and then drip into the secondary oil cup 5 and be received by the secondary oil cup 5, which can prevent the oil liquid dripping from the front plate 21 from directly falling onto the stove body or cookware and affecting the user experience.

[0047] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modification, equivalent replacement or improvement made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A range hood, characterized in that, Comprising: A range hood main body (1) having a smoke collecting cavity (11) and an air suction port (131) communicating with the smoke collecting cavity (11). A smoke exhaust fan (12) is provided in the smoke collecting cavity (11). The path of the oil flowing in the smoke collecting cavity (11) and flowing out of the smoke collecting cavity (11) forms a main oil path. A back plate assembly (2) connected to the rear side of the range hood main body (1). The path of the oil flowing out along the back plate assembly (2) forms a secondary oil path. Wherein, when the smoke exhaust fan (12) operates, the main oil path is closed; when the smoke exhaust fan (12) stops operating, the main oil path is opened, and the secondary oil path is in an always-open state.

2. The range hood according to claim 1, wherein, The range hood main body (1) has an air suction panel (13) provided with the air suction port (131). The air suction panel (13) is further provided with an oil guiding hole communicating with the smoke collecting cavity (11). The oil guiding hole forms the outlet of the main oil path. When the smoke exhaust fan (12) operates, the oil guiding hole is closed; when the smoke exhaust fan (12) stops operating, the oil guiding hole is opened.

3. The range hood according to claim 2, characterized in that, A switching valve assembly (3) is connected to the oil guiding hole. The switching valve assembly (3) has a force-receiving part. When the force-receiving part is not stressed or is subjected to a force towards the outside of the smoke collecting cavity (11), the switching valve assembly (3) is in a state of opening the oil guiding hole; when the force-receiving part is subjected to a force towards the smoke collecting cavity (11), the switching valve assembly (3) is closed. When the smoke exhaust fan (12) operates, the air pressure difference inside and outside the smoke collecting cavity (11) causes the force-receiving part to be subjected to a force towards the smoke collecting cavity (11), and the switching valve assembly (3) closes the oil guiding hole. After the smoke exhaust fan (12) stops operating, when the oil in the main oil path flows out through the oil guiding hole and acts on the force-receiving part, the force-receiving part is subjected to a force towards the outside of the smoke collecting cavity (11), and the switching valve assembly (3) opens the oil guiding hole.

4. The range hood according to claim 3, characterized in that, The switching valve assembly (3) includes a valve body (31), a valve core (32) and a spring (33). The valve body (31) has a diversion channel (311) that penetrates the valve body (31) and forms an oil leakage hole (312) on the upper end face of the valve body (31). The valve core (32) is slidably connected in the diversion channel (311). The valve core (32) forms the force-receiving part of the switching valve assembly (3). The spring (33) is provided below the valve core (32) to support the valve core (32). When the force-receiving part is not stressed, the spring (33) is in a freely extended state, and the valve core (32) opens the oil guiding hole. When the valve core (32) is subjected to a force towards the smoke collecting cavity (11), the valve core (32) closes the oil guiding hole. After the smoke exhaust fan (12) stops operating, when the oil in the main oil path flows out through the oil guiding hole and acts on the valve core (32), the valve core (32) moves downward under the action of the oil to compress the spring (33) and open the oil guiding hole.

5. The cigarette machine according to claim 4, characterized in that, The valve body (31) further has a guiding channel (313). The guiding channel (313) is sleeved inside the diversion channel (311) and is connected to the inner wall surface of the diversion channel (311) through connecting ribs. The valve core (32) has a valve head (321) and a valve stem (322) connected below the valve head (321). The valve stem (322) is sleeved inside the guiding channel (313). The spring (33) is sleeved on the valve stem (322) and is located between the valve head (321) and the upper end surface of the guiding channel (313). The upper surface of the valve head (321) is arc-shaped and its cross-sectional area is larger than the area of the oil leakage hole (312).

6. The smoke machine according to claim 1, characterized in that, It further includes a main oil cup (4). The main oil cup (4) is connected to the range hood main body (1) and is used for receiving the oil discharged from the main oil path. The main oil cup (4) is communicated with the secondary oil path.

7. The range hood according to claim 1, wherein, The back plate assembly (2) includes a front plate (21) facing the user side and a back plate (22) located behind the front plate (21). The back plate (22) is connected to the range hood main body (1). The front plate (21) is connected to the back plate (22). A oil guiding cavity (23) is formed between the front plate (21) and the back plate (22). The oil guiding cavity (23) is communicated with the main oil path. The path of the oil flowing along the oil guiding cavity (23) and the path of the oil flowing along the front plate (21) form the secondary oil path.

8. The range hood according to claim 7, characterized in that, The upper edge of the front plate (21) is provided with an oil guiding member (24). The oil guiding member (24) has an oil guiding groove (241). The oil inlet of the oil guiding groove (241) is communicated with the main oil path. The oil outlet of the oil guiding groove (241) is communicated with the oil guiding cavity (23).

9. The range hood according to claim 8, wherein, It further includes a main oil cup (4). The main oil cup (4) is connected to the range hood main body (1) and is used for receiving the oil discharged from the main oil path. The bottom surface of the main oil cup (4) is inclined downward from front to back, and at least the downward projection of the rear edge of the bottom surface of the main oil cup (4) falls into the oil guiding groove (241).

10. The smoke machine according to claim 7, characterized in that, It further includes a secondary oil cup (5). The secondary oil cup (5) is connected below the back plate (22) or the front plate (21). The downward projection of the lower edge of the front plate (21) falls into the secondary oil cup (5). The downward projection of the oil outlet hole of the oil guiding cavity (23) falls into the secondary oil cup (5). The secondary oil cup (5) is used for receiving the oil discharged from the secondary oil path.

Images