Pollution discharge structure of range hood

Abstract

The invention provides a blowdown structure of a range hood, and belongs to the technical field of range hoods. The pollution discharge structure solves the problems that an existing pollution discharge structure of the range hood is low in use reliability and short in service life. According to the blowdown structure of the range hood, the range hood comprises a flue shell, a draught fan and an oil stain cleaning device, an air inlet of the draught fan is communicated with the lower portion of the flue shell, an air outlet of the draught fan is connected with a smoke exhaust pipe, the oil stain cleaning device comprises a spraying piece arranged in the flue shell, and the blowdown structure comprises a liquid discharge outlet formed in the bottom of the flue shell. A liquid discharge inlet is formed in the smoke discharge pipe, the liquid discharge inlet is not higher than the liquid discharge outlet, a water storage bent pipe is further connected between the flue shell and the smoke discharge pipe, one end of the water storage bent pipe faces upwards and is communicated with the liquid discharge outlet, the other end of the water storage bent pipe faces upwards and is communicated with the liquid discharge inlet, and a drain outlet is further formed in the smoke discharge pipe. According to the blowdown structure of the range hood, the range hood with a cleaning function can ensure the oil smoke suction effect, and meanwhile, the use reliability is improved and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of range hoods and relates to a sewage discharge structure of a range hood. Background Art

[0002] Range hoods are household appliances used in family kitchens to remove fumes produced during cooking. After a long period of development, range hoods have evolved from the initial top-suction range hoods to the side-suction range hoods. Range hoods are no longer limited to being simple tools for removing kitchen fumes, but have added more entertainment and usage functions. However, due to the long-term use of range hoods, a large amount of grease will accumulate on the flue and the impeller of the fan, which will affect the efficiency of extracting fumes. Therefore, range hoods need to be cleaned regularly, so self-cleaning range hoods that do not require disassembly have appeared on the market.

[0003] As disclosed in the patent document (application number: 202210463061.6), the cooking device and its control method include a cleaning device for cleaning the impeller and filter of the fan system, the cleaning device includes a cleaning medium supply pipe and a nozzle, the cleaning medium supply pipe extends in the left and right directions, the nozzle is arranged on the cleaning medium supply pipe, and the cleaning device is designed in the form of an external tap water pipeline, the tap water is connected to one end of the water inlet solenoid valve through the water inlet pipe, the other end of the water inlet solenoid valve is connected to the first heating module, the outlet of the heating module is directly or indirectly connected to the cleaning solenoid valve, the cleaning solenoid valve is connected to each cleaning medium supply pipe through a hose, a normally open solenoid valve is installed at the bottom of the bellows, an oil leakage hole is opened at the lowest position of the volute, the normally open solenoid valve corresponds to the position of the oil leakage hole, and the oil leakage hole can be opened or closed. When the range hood is cleaned, tap water is sprayed out from the nozzle on the supply pipe, and the cleaning liquid will flow into the lower volute to soak the impeller. When the soaking is completed and drainage is required, the oil leakage hole is opened through the bottom solenoid valve for drainage.

[0004] Since the kitchen usually has only one sewage pipe connected to the sink, the oil leakage hole will be connected to the sewage pipe for drainage. However, the biggest risk of the sewage pipe is the backflow phenomenon, that is, when the sewage pipe is blocked, sewage will flow back. If it flows back into the range hood, it will cause damage. Therefore, the above-mentioned solenoid valve is an indispensable blocking component, but the solenoid valve is an electronic component and controls the valve to open and close the oil leakage hole. The internal environment of the range hood is relatively harsh, especially the bottom of the volute will adhere to stubborn oil stains, and the temperature is also high when exhausting oil smoke. These will lead to low reliability and service life of the solenoid valve. Even if a spring-loaded one-way valve is used, it will fail due to oil adhesion. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the prior art and to propose a sewage exhaust structure for a range hood, which can improve the reliability and service life of the range hood with a cleaning function while ensuring the oil fume absorption effect.

[0006] The objectives of the present invention can be achieved through the following technical solutions: a sewage discharge structure of a range hood, the range hood comprising a flue shell with an oil fume suction port at the top, a fan and an oil cleaning device, the air inlet of the fan is connected to the lower part of the flue shell, the air outlet of the fan is connected to the exhaust pipe, the oil cleaning device comprises a spray member arranged in the flue shell, the sewage discharge structure comprises a liquid discharge outlet arranged at the bottom of the flue shell, and is characterized in that a liquid discharge inlet is provided on the exhaust pipe, and the liquid discharge inlet is not higher than the liquid discharge outlet, a U-shaped water trap is also connected between the flue shell and the exhaust pipe, one end of the water trap faces upward and is connected to the liquid discharge outlet, and the other end faces upward and is connected to the liquid discharge inlet, and a sewage discharge outlet is also provided on the exhaust pipe.

[0007] The sewage outlet on the smoke exhaust pipe of the present application can be connected to the kitchen sewage pipe. The oil cleaning device generates foam and sprays it into the flue shell through the spray part. The foam can adhere to the inner wall of the flue shell and fill the flue shell. After standing for a set time, the foam can decompose the oil on the inner wall of the flue shell. Then the oil cleaning device sprays clean water through the spray part for flushing. The flushed sewage flows to the bottom of the flue shell. Since the drainage inlet of the smoke exhaust pipe is not higher than the drainage outlet of the flue shell, "not higher than" here means that it is not higher than the drainage outlet as a whole, that is, the lowest point of the drainage inlet edge is not higher than the drainage outlet. Therefore, the sewage in the flue shell can be discharged into the smoke exhaust pipe through the water trap and discharged into the sewage pipe from the sewage outlet along the smoke exhaust pipe.

[0008] Among them, the present application breaks the inertial thinking that the smoke exhaust pipe is only used for smoke exhaust, and respectively opens a liquid discharge inlet and a sewage discharge outlet on the smoke exhaust pipe, thereby connecting the liquid discharge outlet of the flue shell with the smoke exhaust pipe, and the smoke exhaust pipe is connected with the sewage discharge pipe, so that the smoke exhaust pipe originally used for smoke exhaust plays the role of connecting the flue shell and the sewage discharge pipe. Then, even if the sewage discharge pipe is blocked and backflow occurs, the sewage in the sewage discharge pipe will flow back into the smoke exhaust pipe, and the liquid discharge inlet is not higher than the liquid discharge outlet. Therefore, the sewage that flows back into the smoke exhaust pipe can be discharged from the smoke exhaust outlet and will not flow back into the flue shell. Therefore, the structure does not need to install electronic components such as solenoid valves to switch the liquid discharge outlet of the flue shell, thereby ensuring the reliability and service life of the range hood.

[0009] Furthermore, in order to reduce the use of electronic components such as solenoid valves, the discharge outlet of the flue shell is connected to the discharge inlet of the exhaust pipe. When the range hood works normally to absorb oil smoke, the air inlet of the fan draws air from the bottom of the flue shell and discharges it into the exhaust pipe. At this time, if the discharge outlet of the flue shell and the discharge inlet of the exhaust pipe are not blocked, negative pressure may be generated at the bottom of the flue shell and the oil smoke in the exhaust pipe may be sucked back into the flue shell from the discharge outlet, thereby affecting the oil smoke absorption effect of the range hood. The present application breaks the conventional thinking that the water trap is only used in the drainage system to prevent odor from flowing back into the room. The water trap is connected to the drainage outlet and the drainage inlet of the flue shell. The water outlet bend is U-shaped with both ends facing upward. Therefore, the water in the water trap can form a liquid seal to prevent the oil smoke in the exhaust pipe from being drawn back into the flue shell. That is, the water trap prevents the flue shell from being depressurized, thereby ensuring the oil smoke absorption effect of the range hood without installing electronic components such as solenoid valves.

[0010] During the process of extracting oil, the inner wall of the exhaust pipe will also adhere to oil stains, which will be deposited on the bottom of the exhaust pipe. The sewage flushed down from the flue shell also contains detergent components. Therefore, the sewage is first discharged into the exhaust pipe, and then flows into the sewage outlet along the exhaust pipe. The sewage containing detergent can also decompose and clean the oil stains in the exhaust pipe, thereby improving the extraction effect.

[0011] In the above-mentioned sewage discharge structure of the range hood, the flue shell has a concave bottom surface, the drainage outlet is arranged at the lowest position of the flue shell bottom surface, the drainage inlet is arranged on the side wall of the smoke exhaust pipe, and the drainage outlet is higher than the drainage inlet. The concave bottom surface of the flue shell plays a role of converging, so that the sewage in the flue shell can be fully discharged from the drainage outlet to ensure the cleaning effect, and the drainage outlet is higher than the drainage inlet, so that the water seal liquid level in the water trap has a certain distance from the drainage outlet, thereby preventing the fan from sucking the water in the water trap back into the flue shell when extracting the range fumes, and ensuring the stability and reliability of use.

[0012] In the above-mentioned sewage discharge structure of the range hood, the exhaust pipe is arranged horizontally, and the inlet end of the exhaust pipe is bent upward and connected to the air outlet of the fan, the liquid discharge inlet is close to the inlet end of the exhaust pipe, and the sewage outlet is opened on the bottom surface of the exhaust pipe and close to the outlet end. The exhaust pipe is arranged horizontally, so the sewage can flow along the exhaust pipe after entering from the liquid discharge inlet at the inlet end of the exhaust pipe until it flows out from the sewage outlet at the outlet end. The sewage flows through the entire exhaust pipe, thereby fully decomposing and cleaning the oil stains on the inner wall of the exhaust pipe, improving the cleanliness of the exhaust pipe and indirectly improving the effect of extracting oil smoke. At the same time, even if the sewage pipe has backflow and causes sewage to flow back from the sewage outlet into the exhaust pipe, the sewage can be discharged directly from the outlet end of the exhaust pipe next to it, and will not flow back to the liquid discharge inlet at a higher position and the air outlet of the fan housing, thereby ensuring the reliability and service life of the use.

[0013] In the above-mentioned exhaust structure of the range hood, the fan includes a casing arranged on one side of the flue casing and an impeller arranged in the casing, the above-mentioned air outlet is opened on the bottom surface of the casing and arranged downward, and the oil cleaning device also includes a spray head arranged in the casing. The spray head is arranged on one side of the top of the casing, that is, the spray head and the air outlet are respectively located on opposite sides of the center line of the casing, so that the foam sprayed by the spray head can stay in the casing as much as possible, and the oil on the inner wall of the casing and the impeller is fully decomposed, and the air outlet is located on the bottom surface of the casing, so that the washed sewage can be directly discharged from the air outlet into the exhaust pipe.

[0014] In the above-mentioned sewage discharge structure of the range hood, the smoke exhaust pipe includes a water-gas separation pipe located at the outlet end, the above-mentioned sewage discharge port is opened on the bottom surface of the water-gas separation pipe, the bottom of the water-gas separation pipe has a water storage box, the sewage discharge port is located above the water storage box and is connected with the inner cavity of the water storage box, the side wall of the water storage box is provided with a drainage interface, and the water-gas separation pipe is also provided with a baffle plate which is arranged circumferentially along the edge of the sewage discharge port and extends downward into the water storage box, and the lower edge of the baffle plate is lower than the drainage interface. Since the smoke exhaust pipe needs to take into account the function of discharging sewage, the sewage outlet needs to be connected to the sewage pipe, which may cause the odor in the sewage pipe to flow back into the smoke exhaust pipe, and then enter the fan casing and the flue pipe, and flow back into the room from the oil smoke suction port. For this reason, the smoke exhaust pipe of the present application also includes a water-gas separation pipe, and the sewage outlet is opened on the bottom surface of the water-gas separation pipe, and the bottom of the water-gas separation pipe also has a water storage box. The drainage interface on the side wall of the water storage box is used to connect the sewage pipe. When the range hood is cleaned, sewage flows from the sewage outlet into the water storage box below. When the water level in the water storage box rises to above the drainage interface, it is discharged into the sewage pipe from the drainage interface. Therefore, after the range hood is cleaned, water can be stored in the water storage box, and the liquid level is flush with the lower edge of the drainage interface, and the lower edge of the baffle is lower than the drainage interface. Therefore, the bottom of the baffle is inserted in the water, and the baffle separates the sewage outlet from the drainage interface, and the water below acts as a liquid seal to prevent the odor in the sewage pipe from flowing back.

[0015] In the above-mentioned sewage discharge structure of the range hood, an isolation mesh plate for sealing the sewage discharge port is also provided in the water-gas separation pipe. The baffle plate is cylindrical and arranged near the edge of the sewage discharge port, and the upper edge of the baffle plate is fixed on the lower side of the isolation mesh plate, and there is a gap between the lower edge of the baffle plate and the bottom surface of the water storage box. The isolation mesh plate can filter sewage and prevent foreign matter from entering the sewage discharge pipe and causing blockage. After passing through the isolation mesh plate, the sewage flows down from the inner hole of the baffle plate, enters the water storage box, passes through the lower edge of the baffle plate, and enters the drainage interface, achieving a better liquid sealing effect.

[0016] In the above-mentioned sewage discharge structure of the range hood, the spray part includes a spray box fixed on the top of the flue shell, and a plurality of spray holes are opened on the side wall of the spray box, and the plurality of spray holes are opposite to the inner side wall of the flue shell. A lifting door and an electric push rod for driving the lifting door to rise and fall are also provided in the flue shell, and the oil fume suction port can be covered when the lifting door rises. When the range hood needs to be cleaned, the electric push rod drives the lifting door to rise and cover the oil fume suction port, so that the flue shell is a closed cavity, and the foam generated by the oil fume cleaning device first enters the spray box, and is sprayed from the spray hole after filling the entire spray box. The spray hole faces the side wall of the flue shell, so the foam can adhere to the side wall of the flue shell and gradually fill the entire inner cavity of the flue shell, which has a better cleaning effect.

[0017] In the above-mentioned exhaust structure of the range hood, the flue shell is flat, the spray box is long and arranged along the width direction of the flue shell, and the cross section of the spray box is rectangular, and the gap width between the side wall of the spray box with the spray hole and the side wall of the flue shell is less than 15 mm. The gap between the outer wall of the spray box and the inner wall of the flue shell is small, so that the foam sprayed from the spray hole directly adheres to the inner wall of the flue shell instead of dripping directly. At the same time, the flat flue shell also makes the foam in the inner cavity fully contact with the inner wall to decompose the oil, and also avoids the foam in the middle from falling quickly due to lack of adhesion due to the excessively wide chamber space, which makes the foam stay longer and the cleaning effect is better.

[0018] In the above-mentioned exhaust structure of the range hood, the oil cleaning device also includes a distribution pipe equipped with a foam synthesizer, the foam synthesizer has an air inlet and a diluent inlet, the distribution pipe has a tap water inlet and two foam outlets, and the two foam outlets are respectively connected to the spray box and the spray head through pipelines. The concentrate and water are pre-diluted and stored in proportion. When the range hood is cleaned, the diluent and air enter the foam synthesizer to synthesize foam. Since the distribution pipe is connected to tap water through the tap water inlet, after the foam in the flue shell decomposes the oil, the distribution pipe can transport tap water to the spray box and the spray head to directly flush the flue shell and the casing of the fan, thereby improving the cleaning efficiency and effect.

[0019] The smoke exhaust structure is characterized in that a liquid discharge inlet is provided on the smoke exhaust pipe, and the liquid discharge inlet is not higher than the liquid discharge outlet, and a water storage box is further connected between the smoke exhaust pipe and the smoke exhaust pipe, and two connecting ports are respectively provided on the upper part of the water storage box, and the two connecting ports are respectively connected with the liquid discharge inlet and the liquid discharge outlet, and a partition plate is vertically fixedly connected to the inner top surface of the water storage box, and the lower edge of the partition plate is lower than the liquid discharge inlet and has a spacing with the bottom surface of the water storage box, and the two connecting ports are respectively located on both sides of the partition plate, and a sewage outlet is also provided on the smoke exhaust pipe. A water storage box is connected between the flue shell and the smoke exhaust pipe, not a water trap elbow. When cleaning is required, sewage enters the water storage box from the drainage outlet, passes under the partition plate, and then enters the smoke exhaust pipe from the drainage inlet. After cleaning, a part of the sewage can be stored in the water storage box. The liquid level of the sewage is higher than the lower edge of the partition plate. Therefore, the partition plate can separate the two connecting ports, that is, the water in the water storage box can form a liquid seal to prevent the smoke in the smoke exhaust pipe from being drawn back into the flue shell when extracting smoke.

[0020] Compared with the prior art, the sewage discharge structure of the range hood has the following advantages:

[0021] 1. Since the liquid discharge outlet of the flue shell is connected to the smoke exhaust pipe, and the smoke exhaust pipe is connected to the sewage pipe, even if the sewage pipe is blocked and backflow occurs, the sewage in the sewage pipe will flow back into the smoke exhaust pipe, and the sewage in the smoke exhaust pipe can be discharged from the smoke exhaust port and will not flow back into the flue shell. Therefore, this structure does not need to install electronic components such as solenoid valves to switch the liquid discharge outlet of the flue shell, thereby ensuring the reliability and service life of the range hood.

[0022] 2. Since the water trap is connected to the drainage outlet and the drainage inlet of the flue shell, and the water outlet is U-shaped with both ends facing upward, the water in the water trap can form a liquid seal to prevent the oil smoke in the exhaust pipe from being drawn back into the flue shell. That is, the water trap prevents the flue shell from being depressurized, thereby ensuring the oil smoke suction effect of the range hood without installing electronic components such as solenoid valves.

[0023] 3. Since the sewage flushed down from the flue shell also contains detergent components, the sewage is first discharged into the exhaust pipe, and then flows into the sewage outlet along the exhaust pipe. The sewage containing detergent can also decompose and clean the oil stains in the exhaust pipe, thereby cleaning the exhaust pipe and further improving the oil fume absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of a range hood.

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure when the flue shell is connected to the exhaust pipe.

[0026] Figure 3 It is a three-dimensional structural diagram from another perspective when the flue shell is connected to the exhaust pipe.

[0027] Figure 4 It is a structural cross-sectional view of the flue shell when it is connected to the exhaust pipe.

[0028] Figure 5 yes Figure 1 A magnified view of the structure at center.

[0029] Figure 6 yes Figure 1 Partial structural cross-sectional view at BB in the middle.

[0030] Figure 7 yes Figure 6 Partial structural cross-sectional view at CC in the middle.

[0031] Figure 8 This is a schematic diagram of the range hood in use.

[0032] Fig. 9 It is a structural cross-sectional view of the flue shell when connected to the water storage box in the second embodiment.

[0033] In the figure, 1, flue shell; 11, oil smoke inlet; 12, exhaust port; 13, liquid discharge outlet; 2, fan; 21, casing; 211, air inlet; 212, air outlet; 22, impeller; 23, motor; 3, smoke exhaust pipe; 31, liquid discharge inlet; 32, water-gas separation pipe; 321, sewage outlet; 322, water storage box; 323, drainage interface; 324, inspection port; 33, isolation mesh; 331, filter hole; 332, baffle; 333, pull ring; 34, liquid level Sensor; 4. Oil cleaning device; 41. Concentrate storage tank; 42. Dilution storage tank; 43. Foam synthesizer; 431. Air inlet; 432. Dilution inlet; 44. Spray box; 441. Spray hole; 45. Spray head; 46. Distribution pipe; 461. Tap water inlet; 462. Foam outlet; 463. Solenoid valve; 464. Installation port; 5. Water trap; 6. Electric push rod; 61. Lifting door; 7. Water storage box; 71. Connecting port; 72. Partition plate. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] Embodiment 1:

[0036] like Figure 1As shown, a sewage discharge structure of a range hood, the range hood comprises a flue shell 1, a fan 2, a smoke exhaust pipe 3 and an oil cleaning device 4. The flue shell 1 is flat, with a rectangular upper portion and an inverted triangle lower portion. A long oil fume suction port 11 is provided on the upper side wall of the flue shell 1 along the width direction, and an air exhaust port 12 is provided on the lower side wall of the flue shell 1. The air exhaust port 12 is higher than the bottom surface of the flue shell 1. The oil cleaning device 4 comprises a concentrated liquid storage tank 41, a diluent storage tank 42, a foam synthesizer 43, a spray box 44, a spray head 45 and a distribution pipe 46. The concentrated liquid storage tank 41 is connected to the diluent storage tank 42. The concentrated liquid in the concentrated liquid storage tank 41 can be diluted with water in a proportion into the diluent storage tank 42. Figure 5 As shown, one end of the distribution pipe 46 is a tap water inlet 461, and the other end forms two foam outlets 462 through a tee. The distribution pipe 46 also has a mounting port 464, and the foam synthesizer 43 is mounted on the mounting port 464. The foam synthesizer 43 has an air inlet 431 and a diluent inlet 432, wherein the air inlet 431 is connected to an air pump for the air required for synthesizing foam, and the diluent inlet 432 is connected to the diluent storage tank 42. A solenoid valve 463 for controlling on and off is installed at the tap water inlet 461, which is connected to external tap water for flushing foam. The two foam outlets 462 are respectively connected to the spray box 44 and the spray head 45 through pipelines, and the diluent can enter the foam synthesizer 43 to generate foam. The means for synthesizing foam by the foam synthesizer 43 is the prior art. The spray box 44 is fixed on the top of the flue shell 1, and a spray hole 441 is opened on its side wall. Figures 2 to 4 As shown, the fan 2 includes a casing 21, an impeller 22 arranged in the casing 21 and a motor 23 for driving the impeller 22 to rotate. The air inlet 211 of the casing 21 is opened on the side wall, and the air outlet 212 is opened on the bottom surface. The casing 21 is fixed to the side of the flue shell 1, and the air inlet 211 of the casing 21 is relatively connected with the exhaust port 12 of the flue shell 1. The smoke exhaust pipe 3 is horizontally arranged, and the inlet end of the smoke exhaust pipe 3 is bent upward and connected with the air outlet 212 of the casing 21. A sewage outlet 321 is also opened on the bottom surface of the smoke exhaust pipe 3. The sewage outlet 321 is close to the outlet end of the smoke exhaust pipe 3 and is used to connect the sewage outlet pipe. The sewage discharge structure includes a U-shaped trap 5, the bottom surface of the flue shell 1 is an arc-shaped concave arc surface, a drainage outlet 13 is provided at the lowest position of the bottom surface of the flue shell 1, and a drainage inlet 31 is provided on the side wall of the smoke exhaust pipe 3. The drainage inlet 31 is close to the inlet end of the smoke exhaust pipe 3, and the drainage outlet 13 is higher than the drainage inlet 31. The trap 5 is fixedly connected between the flue shell 1 and the smoke exhaust pipe 3, and one end of the trap 5 is vertically upward and connected to the drainage outlet 13, and the other end is vertically upward and connected to the drainage inlet 31 after being bent sideways.

[0037] Specifically, the spray box 44 is in the shape of a long strip and is fixed to the top of the flue shell 1 along the width direction. The cross section of the spray box 44 is rectangular, and has two side walls opposite to the inner side wall of the flue shell 1, and a row of spray holes 441 are provided on the two side walls, that is, the spray holes 441 are evenly spaced along the length direction of the spray box 44 and face the inner side wall of the flue shell 1. The width of the gap between the outer wall of the spray box 44 and the inner side wall of the flue shell 1 is 3mm-15mm, and 5mm is preferred in this embodiment. The spray box 44 is higher than the oil fume suction port 11, so an electric push rod 6 and a flat lifting door 61 are also provided in the flue shell 1. The electric push rod 6 is vertically fixed on the inner wall of the flue shell 1, and the lifting door 61 is fixed at the driving end of the electric push rod 6, and the lifting door 61 is close to the inner side wall of the flue shell 1. When the electric push rod 6 extends upward, the lifting door 61 can rise and cover the oil fume suction port 11. The spray head 45 is fixed in the casing 21 of the fan 2 . The spray head 45 is located at the oblique top of the casing 21 and faces the impeller 22 . That is, the spray head 45 and the air outlet 212 are located at the radial sides of the center line of the casing 21 .

[0038] Combination Figure 6 , Figure 7 As shown, the smoke exhaust pipe 3 includes a water-gas separation pipe 32 located at the outlet end, the water-gas separation pipe 32 is a circular pipe, a sewage outlet 321 is opened on the bottom surface of the water-gas separation pipe 32, and a water storage box 322 is provided at the bottom of the water-gas separation pipe 32. The sewage outlet 321 is located above the water storage box 322 and is relatively connected to the inner cavity of the water storage box 322. A drainage interface 323 is provided on the side wall of the water storage box 322, and the drainage interface 323 is higher than the bottom surface of the water storage box 322, and is used to connect the sewage pipe. An isolation mesh plate 33 is also provided in the water-gas separation tube 32. The isolation mesh plate 33 has filter holes 331. The isolation mesh plate 33 is laid on the bottom surface of the water-gas separation tube 32 and covers the sewage outlet 321. A cylindrical baffle plate 332 is vertically fixed on the lower side of the isolation mesh plate 33. The outer side of the baffle plate 332 is close to or against the edge of the sewage outlet 321. The lower end of the baffle plate 332 extends downward into the water storage box 322. There is a gap between the lower edge of the baffle plate 332 and the bottom surface of the water storage box 322. The lower edge of the baffle plate 332 is lower than the drainage interface 323. An inspection port 324 is opened at the oblique top of the water-gas separation tube 32. The inspection port 324 is opposite to the isolation mesh plate 33 below. A pull ring 333 is provided on the isolation mesh plate 33 for easy inspection. A liquid level sensor 34 is installed at the drainage interface 323, and the liquid level sensor 34 can give an alarm when the sewage pipe is blocked and backflow occurs.

[0039] Combination Figure 8As shown, when the range hood is cleaned, the concentrated liquid in the concentrated liquid storage tank 41 and the water enter the diluent storage tank 42 in proportion to form a diluent, the electric push rod 6 drives the lifting door 61 upward, the lifting door 61 closes the oil fume suction port 11, and the diluent in the diluent storage tank 42 enters the foam synthesizer 43, the foam synthesizer 43 generates foam and enters the spray box 44 and the spray head 45 through the pipeline respectively, the spray head 45 directly sprays the foam to the impeller 22 in the casing 21, and the foam in the spray box 44 is filled and sprayed from the spray hole 441 and attached to the inner wall of the flue shell 1, and the flue shell 1 is filled with foam and then left to stand for a set time, during which the fan 2 can also be rotated in the reverse direction at a low speed, the fan 2 discharges air into the flue shell 1, and the upward reverse airflow in the flue shell 1 can act on the foam, thereby supporting the foam, preventing the foam from sinking too quickly, delaying the contact and decomposition time between the foam and the oil stains on the inner wall of the flue shell 1, and improving the oil stain cleaning effect. After standing for a set time, the distribution pipe 46 can deliver water to the spray box 44 and the spray head 45 for flushing the flue shell 1 and the casing 21. The sewage flushed down in the flue shell 1 can be discharged into the smoke exhaust pipe 3 from the drainage outlet 13 through the water trap 5. The sewage in the casing 21 of the fan 2 is directly discharged into the smoke exhaust pipe 3 from the air outlet 212. The sewage in the smoke exhaust pipe 3 flows to the sewage outlet 321 and falls into the water storage box 322 from the sewage outlet 321. The sewage in the water storage box 322 is discharged into the sewage pipe from the drainage interface 323. After the range hood is cleaned, water will be stored in the water trap 5 and the water storage box 322 to form a liquid seal. Then, when the range hood is extracting oil fumes, the liquid seal in the water trap 5 can prevent the smoke in the smoke exhaust pipe 3 from returning to the flue shell 1, thereby avoiding pressure relief in the flue shell 1 and ensuring the efficiency of oil fume extraction. The liquid seal in the water storage box 322 can prevent oil fumes from entering the sewage pipe, and can also prevent the odor in the sewage pipe from entering the smoke exhaust pipe 3 and flowing back into the room.

[0040] Embodiment 2:

[0041] The structure of the quick connector is basically the same as that of the first embodiment. Fig. 9 As shown, a water storage box 7 is also connected between the flue shell 1 and the smoke exhaust pipe 3, and two communication ports 71 are respectively opened on the upper part of the water storage box 7. One communication port 71 is opened on the top wall and connected to the drainage outlet 13, and the other communication port 71 is opened on the side wall and connected to the drainage inlet 31. A partition plate 72 is vertically fixedly connected to the inner top surface of the water storage box 7. The lower edge of the partition plate 72 is lower than the drainage inlet 31 and there is a gap between it and the bottom surface of the water storage box 7. The two communication ports 71 are respectively located on both sides of the partition plate 72.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0043] Although the terms such as flue shell 1, oil smoke suction port 11, and exhaust port 12 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A sewage discharge structure of a range hood, the range hood comprising a flue shell (1) with a smoke suction port (11) formed at the upper portion, a fan (2) and an oily dirt cleaning device (4), wherein an air inlet (211) of the fan (2) is connected to a lower portion of the flue shell (1), an air outlet (212) of the fan (2) is connected to a smoke exhaust pipe (3), the oily dirt cleaning device (4) comprises a spraying member arranged in the flue shell (1), and the sewage discharge structure comprises a liquid discharge outlet (13) formed at the bottom of the flue shell (1), characterized in that: The smoke exhaust pipe (3) is provided with a liquid discharge inlet (31), and the liquid discharge inlet (31) is not higher than the liquid discharge outlet (13). A U-shaped water trap (5) is also connected between the flue shell (1) and the smoke exhaust pipe (3). One end of the water trap (5) faces upward and is connected to the liquid discharge outlet (13), and the other end faces upward and is connected to the liquid discharge inlet (31). The smoke exhaust pipe (3) is also provided with a sewage discharge outlet (321).

2. The sewage discharge structure of the range hood according to claim 1, characterized in that: The flue shell (1) has a concave bottom surface, the drainage outlet (13) is arranged at the lowest position of the bottom surface of the flue shell (1), the drainage inlet (31) is arranged on the side wall of the smoke exhaust pipe (3), and the drainage outlet (13) is higher than the drainage inlet (31).

3. The sewage discharge structure of the range hood according to claim 2, characterized in that: The smoke exhaust pipe (3) is arranged horizontally, and the inlet end of the smoke exhaust pipe (3) is bent upward and connected to the air outlet (212) of the fan (2), the liquid discharge inlet (31) is close to the inlet end of the smoke exhaust pipe (3), and the sewage discharge outlet (321) is opened on the bottom surface of the smoke exhaust pipe (3) and close to the outlet end.

4. The sewage discharge structure of the range hood according to claim 1, 2 or 3, characterized in that: The fan (2) comprises a casing (21) arranged on one side of the flue casing (1) and an impeller (22) arranged in the casing (21); the air outlet (212) is provided on the bottom surface of the casing (21) and is arranged downward; and the oil cleaning device (4) further comprises a spray head (45) arranged in the casing (21).

5. The sewage discharge structure of the range hood according to claim 1, 2 or 3, characterized in that: The smoke exhaust pipe (3) comprises a water-gas separation pipe (32) located at the outlet end, the sewage outlet (321) being arranged on the bottom surface of the water-gas separation pipe (32), the bottom of the water-gas separation pipe (32) being provided with a water storage box (322), the sewage outlet (321) being arranged above the water storage box (322) and being in communication with the inner cavity of the water storage box (322), the side wall of the water storage box (322) being provided with a drainage interface (323), and the water-gas separation pipe (32) being provided with a baffle (332) arranged along the circumferential edge of the sewage outlet (321) and extending downward into the water storage box (322), the lower edge of the baffle (332) being lower than the drainage interface (323).

6. The sewage discharge structure of the range hood according to claim 5, characterized in that: An isolation mesh plate (33) for sealing the sewage outlet (321) is also provided in the water-gas separation pipe (32); the baffle plate (332) is cylindrical and is arranged close to the edge of the sewage outlet (321); the upper edge of the baffle plate (332) is fixed to the lower side of the isolation mesh plate (33); and there is a gap between the lower edge of the baffle plate (332) and the bottom surface of the water storage box (322).

7. The sewage discharge structure of the range hood according to claim 4, characterized in that: The spray component comprises a spray box (44) fixed to the top of the flue shell (1), a plurality of spray holes (441) are provided on the side wall of the spray box (44), the plurality of spray holes (441) are opposite to the inner side wall of the flue shell (1), and a lifting door (61) and an electric push rod (6) for driving the lifting door (61) to rise and fall are also provided in the flue shell (1), and the lifting door (61) can cover the oil fume suction port (11) when it rises.

8. The sewage discharge structure of the range hood according to claim 7, characterized in that: The flue shell (1) is flat, the spray box (44) is long and arranged along the width direction of the flue shell (1), and the cross section of the spray box (44) is rectangular. The width of the gap between the side wall of the spray box (44) provided with the spray hole (441) and the side wall of the flue shell (1) is less than 15 mm.

9. The sewage discharge structure of the range hood according to claim 7, characterized in that: The oil stain cleaning device (4) further comprises a distribution pipe (46) equipped with a foam synthesizer (43), wherein the foam synthesizer (43) has an air inlet (431) and a diluent inlet (432), and the distribution pipe (46) has a tap water inlet (461) and two foam outlets (462), wherein the two foam outlets (462) are respectively connected to the spray box (44) and the spray head (45) through pipelines.

10. A sewage discharge structure of a range hood, the range hood comprising a flue shell (1) with a smoke suction port (11) formed at the upper portion, a fan (2) and an oily dirt cleaning device (4), wherein the air inlet (211) of the fan (2) is connected to the lower portion of the flue shell (1), the air outlet (212) of the fan (2) is connected to a smoke exhaust pipe (3), the oily dirt cleaning device (4) comprises a spraying member arranged in the flue shell (1), and the sewage discharge structure comprises a liquid discharge outlet (13) formed at the bottom of the flue shell (1), characterized in that: The smoke exhaust pipe (3) is provided with a liquid discharge inlet (31), and the liquid discharge inlet (31) is not higher than the liquid discharge outlet (13). A water storage box (7) is also connected between the flue shell (1) and the smoke exhaust pipe (3). Two communication ports (71) are respectively provided on the upper part of the water storage box (7). The two communication ports (71) are respectively connected to the liquid discharge inlet (31) and the liquid discharge outlet (13). A partition plate (72) is vertically fixedly connected to the inner top surface of the water storage box (7). The lower edge of the partition plate (72) is lower than the liquid discharge inlet (31) and has a spacing with the bottom surface of the water storage box (7). The two communication ports (71) are respectively located on both sides of the partition plate (72). The smoke exhaust pipe (3) is also provided with a sewage discharge outlet (321).

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