A sewage discharge structure of an oil fume machine

Abstract

The present invention provides a sewage discharge structure for a range hood, belonging to the technical field of range hoods. It solves the problems of low reliability and short service life of the sewage discharge structure of existing range hoods. For the sewage discharge structure of this range hood, the range hood includes a flue shell, a fan, and an oil stain cleaning device. The air inlet of the fan is connected to the lower part of the flue shell, and a smoke exhaust pipe is connected to the air outlet of the fan. The oil stain cleaning device includes a spraying member arranged in the flue shell. The sewage discharge structure includes a liquid discharge outlet opened at the bottom of the flue shell, a liquid discharge inlet opened on the smoke exhaust pipe, and the liquid discharge inlet is not higher than the liquid discharge outlet. A water seal bend pipe is also connected between the flue shell and the smoke exhaust pipe. One end of the water seal bend pipe faces upward and is connected to the liquid discharge outlet, and the other end faces upward and is connected to the liquid discharge inlet. A sewage discharge port is also opened on the smoke exhaust pipe. The sewage discharge structure of this range hood can enable the range hood with a cleaning function to improve the reliability and service life while ensuring the oil fume suction effect.

Description

Technical Field

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

[0002] A range hood is a household appliance used to suck out the oil fumes generated during cooking in a household kitchen. After the long-term development of range hoods, from the initial top-suction range hoods to side-suction range hoods, range hoods are no longer limited to simple tools for removing oil fumes in the kitchen, but have added more entertainment functions and usage functions. However, due to the long-term use of range hoods, a large amount of oil dirt will accumulate on the flue and the impeller of the fan. These oil dirt will affect the oil fume extraction efficiency. Therefore, range hoods need to be cleaned regularly. As a result, range hoods with self-cleaning without disassembly have emerged on the market.

[0003] For example, the cooking device and its control method disclosed in the patent document (application number: 202210463061.6), the cooking device includes a cleaning device for cleaning the impeller and filter screen of the fan system. The cleaning device includes a cleaning medium supply pipe and a nozzle. The cleaning medium supply pipe extends along the left-right direction, and the nozzle is arranged on the cleaning medium supply pipe. The cleaning device is designed in the form of an externally connected tap water pipeline. Tap water is connected to one end of the water inlet solenoid valve through a water inlet pipe, and 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 air box, and 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 can open or close the oil leakage hole. When the range hood is being 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 drainage is required after soaking, the oil leakage hole is opened through the solenoid valve at the bottom for drainage.

[0004] Since there is usually only one sewage discharge pipe connected to the sink in the kitchen, the oil leakage hole will be connected to the sewage discharge pipe for drainage. However, the biggest risk of the sewage discharge pipe is the backwater phenomenon, that is, when the sewage discharge pipe is blocked, the sewage will backflow. If the backflow enters the range hood, it will cause damage. Therefore, the above solenoid valve is an essential blocking component. However, the solenoid valve belongs to 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 relatively high during oil fume extraction. These will all lead to low reliability and service life of the solenoid valve. Even if a spring-type one-way valve is used, it will fail due to the adhesion of oil stains. Summary of the Invention

[0005] The object of the present invention is to address the above problems existing in the prior art and propose a sewage discharge structure for a range hood. The sewage discharge structure of the range hood can improve the use reliability and service life while ensuring the oil fume extraction effect of the range hood with a cleaning function.

[0006] The object of the present invention can be achieved by the following technical solutions: A sewage discharge structure of an oil fume extractor, the oil fume extractor includes a flue shell with an oil fume suction port opened at the upper part, a fan and an oil stain cleaning device. The air inlet of the fan is communicated with the lower part of the flue shell, and a smoke exhaust pipe is connected to the air outlet of the fan. The oil stain cleaning device includes a spraying member arranged in the flue shell. The sewage discharge structure includes a liquid discharge outlet opened at the bottom of the flue shell, and is characterized in that a liquid discharge inlet is opened on the smoke exhaust pipe, and the liquid discharge inlet is not higher than the liquid discharge outlet. A U-shaped water seal pipe is also connected between the flue shell and the smoke exhaust pipe. One end of the water seal pipe faces upward and is communicated with the liquid discharge outlet, and the other end faces upward and is communicated with the liquid discharge inlet. A sewage discharge port is also opened on the smoke exhaust pipe.

[0007] The sewage discharge port on the smoke exhaust pipe of the present application can be connected to the kitchen sewage pipe. The oil stain cleaning device generates foam and sprays it into the flue shell through the spraying member. 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 stains on the inner wall of the flue shell. Then, the oil stain cleaning device sprays clean water through the spraying member for rinsing. The sewage washed down flows to the bottom of the flue shell. Since the liquid discharge inlet of the smoke exhaust pipe is not higher than the liquid discharge outlet of the flue shell, where "not higher than" means not entirely higher than the liquid discharge outlet, that is, the lowest point of the liquid discharge inlet edge is not higher than the liquid discharge outlet. Therefore, the sewage in the flue shell can be discharged into the smoke exhaust pipe through the water seal pipe and discharged into the sewage pipe along the smoke exhaust pipe through the sewage discharge port.

[0008] Among them, the present application breaks the inertial thinking that the smoke exhaust pipe is only used for exhausting smoke. A liquid discharge inlet and a sewage discharge port are respectively opened on the smoke exhaust pipe, so as to connect the liquid discharge outlet of the flue shell with the smoke exhaust pipe, and the smoke exhaust pipe is connected with the sewage pipe, enabling the originally smoke-exhausting smoke exhaust pipe to play the role of connecting the flue shell and the sewage pipe. Then, even if the sewage pipe has a backflow phenomenon due to blockage, the sewage in the sewage pipe will backflow into the smoke exhaust pipe. Since the liquid discharge inlet is not higher than the liquid discharge outlet, the sewage backflowing into the smoke exhaust pipe can be discharged from the smoke exhaust port and will not backflow into the flue shell. Therefore, this structure does not require installing electronic components such as solenoid valves to switch the liquid discharge outlet of the flue shell, thus ensuring the use reliability and service life of the oil fume extractor.

[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 sewage discharge structure of the above-mentioned range hood, the blower includes a housing disposed on one side of the flue housing and an impeller disposed inside the housing. The above-mentioned air outlet is opened on the bottom surface of the housing and is arranged downward. The oil stain cleaning device further includes a spray head disposed inside the housing. The spray head is disposed on one side of the top of the housing, that is, the spray head and the air outlet are respectively located on opposite sides of the center line of the housing. This enables the foam sprayed by the spray head to stay in the housing as much as possible, fully decomposing the oil stains on the inner wall of the housing and the impeller. Since the air outlet is located on the bottom surface of the housing, the sewage washed down can directly drain into the exhaust pipe from the air outlet.

[0014] In the sewage discharge structure of the above-mentioned range hood, the exhaust pipe includes a water-gas separation pipe 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 communicated with the inner cavity of the water storage box. The side wall of the water storage box has a drainage interface. A baffle is further provided in the water-gas separation pipe, which is circumferentially arranged along the edge of the sewage discharge port and extends downward into the water storage box. The lower edge of the baffle is lower than the drainage interface. Since the exhaust pipe needs to take into account the function of discharging sewage, the sewage discharge port needs to be connected to the sewage pipe, which may also cause the odor in the sewage pipe to flow back into the exhaust pipe, and then enter the blower housing and the flue pipe, and flow back into the room from the oil fume suction port. Therefore, the exhaust pipe of this application further includes a water-gas separation pipe. The sewage discharge port is opened on the bottom surface of the water-gas separation pipe. 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, the sewage flows into the lower water storage box from the sewage discharge port. When the water level in the water storage box rises above the drainage interface, it drains into the sewage pipe from the drainage interface. Therefore, the water storage box can store water after the range hood is cleaned, and the liquid level is flush with the lower edge of the drainage interface. The lower edge of the baffle is lower than the drainage interface. Therefore, the bottom of the baffle is inserted into the water. The baffle separates the sewage discharge port from the drainage interface, and the water below plays a liquid seal role to prevent the odor in the sewage pipe from flowing back.

[0015] In the sewage discharge structure of the above-mentioned range hood, a separation net plate for covering the sewage discharge port is further provided in the water-gas separation pipe. The baffle is in a cylindrical shape and is disposed close to the edge of the sewage discharge port. The upper edge of the baffle is fixed on the lower side surface of the separation net plate. There is a gap between the lower edge of the baffle and the bottom surface of the water storage box. The separation net plate can filter the sewage to prevent foreign objects from entering the sewage pipe and causing blockage. The sewage flows through the separation net plate and then flows down through the inner hole of the baffle, enters the water storage box, and then passes through the lower edge of the baffle and enters the drainage interface, achieving a good liquid seal effect.

[0016] In the sewage discharge structure of the above-mentioned range hood, the spraying member includes a spraying box fixed to the top of the flue shell. A number of spraying holes are formed in the side wall of the spraying box, and the number of spraying holes faces the inner side wall of the flue shell. An elevator door and an electric push rod for driving the elevator door to move up and down are further provided in the flue shell, and when the elevator door rises, it can cover the oil fume suction port. When the range hood needs to be cleaned, the electric push rod drives the elevator door to rise and cover the oil fume suction port, so that the flue shell forms a closed cavity. The foam generated by the oil fume cleaning device first enters the spraying box, and after filling the entire spraying box, it sprays out from the spraying holes. The spraying holes face the side wall of the flue shell. Therefore, the foam can adhere to the side wall of the flue shell and gradually fill the inner cavity of the entire flue shell, having a better cleaning effect.

[0017] In the sewage discharge structure of the above-mentioned range hood, the flue shell is flat, the spraying box is strip-shaped and arranged along the width direction of the flue shell, and the cross-section of the spraying box is rectangular. The gap width between the side wall of the spraying box with the spraying holes and the side wall of the flue shell is less than 15 mm. The gap between the outer side wall of the spraying box and the inner side wall of the flue shell is small, so that the foam sprayed out from the spraying holes directly adheres to the inner side wall of the flue shell instead of dripping directly. At the same time, the flat flue shell also enables the foam in the inner cavity to fully contact the inner side wall to decompose the oil stains, and at the same time avoids the foam in the middle lacking adhesion and falling quickly due to the overly large chamber space. This makes the foam stay for a longer time and the cleaning effect is better.

[0018] In the sewage discharge structure of the above-mentioned range hood, the oil stain cleaning device further 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. The two foam outlets are respectively connected to the spraying box and the spray head through pipelines. The concentrated liquid and water are pre-diluted and mixed in proportion and stored. When the range hood is cleaned, the diluent and air enter the foam synthesizer to synthesize foam respectively. Since the distribution pipe is connected to the tap water through the tap water inlet, after the foam in the flue shell decomposes the oil stains, the distribution pipe can convey tap water to the spraying box and the spray head to directly wash the flue shell and the casing of the fan, improving the cleaning efficiency and effect.

[0019] A sewage discharge structure of an oil fume extractor. The oil fume extractor includes a flue shell with an oil fume suction inlet opened at the upper part, a fan, and an oil stain cleaning device. The air inlet of the fan is communicated with the lower part of the flue shell, and a smoke exhaust pipe is connected to the air outlet of the fan. The oil stain cleaning device includes a spraying member arranged in the flue shell. The sewage discharge structure includes a liquid discharge outlet opened at the bottom of the flue shell. It is characterized in that a liquid discharge inlet is opened on the smoke exhaust pipe, and the liquid discharge inlet is not higher than the liquid discharge outlet. A water storage box is also connected between the flue shell and the smoke exhaust pipe. Two communication ports are respectively opened on the upper part of the water storage box, and the two communication ports are respectively communicated with the liquid discharge inlet and the liquid discharge outlet. A partition plate is vertically and fixedly connected to the inner top surface of the water storage box. The lower edge of the partition plate is lower than the liquid discharge inlet and has a spacing from the bottom surface of the water storage box. The two communication ports are respectively located on both sides of the partition plate. A sewage discharge port is also opened on the smoke exhaust pipe. Connecting a water storage box between the flue shell and the smoke exhaust pipe, rather than a water seal bend. When cleaning is required, sewage enters the water storage box from the liquid discharge outlet, passes through below the partition plate, and then enters the smoke exhaust pipe from the liquid discharge inlet. After cleaning, a part of the sewage can be stored in the water storage box, and the liquid level of the sewage is higher than the lower edge of the partition plate. Therefore, the partition plate can separate the two communication ports, that is, the water in the water storage box can form a liquid seal to prevent the oil fume in the smoke exhaust pipe from being sucked back into the flue shell during oil fume extraction.

[0020] Compared with the prior art, the sewage discharge structure of this oil fume extractor has the following advantages:

[0021] 1. Since the liquid discharge outlet of the flue shell is communicated with the smoke exhaust pipe, and the smoke exhaust pipe is communicated with the sewage discharge pipe, even if the sewage discharge pipe is blocked and water backs up, the sewage in the sewage discharge pipe will pour back into the smoke exhaust pipe, and the sewage in the smoke exhaust pipe can be discharged from the smoke outlet and will not pour 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, thus ensuring the use reliability and service life of the oil fume extractor.

[0022] 2. Since the water seal bend is connected between the liquid discharge outlet of the flue shell and the liquid discharge inlet of the flue shell, and the water seal bend is U-shaped with both ends facing up, the water in the water seal bend can form a liquid seal to prevent the oil fume in the smoke exhaust pipe from being sucked back into the flue shell, that is, this water seal bend plays a role in preventing the flue shell from relieving pressure, thus ensuring the oil fume extraction effect of the oil fume extractor without installing electronic components such as solenoid valves.

[0023] 3. Since the sewage washed down in the flue shell still contains detergent components, the sewage is first discharged into the smoke exhaust pipe and then flows into the sewage discharge port along the smoke exhaust pipe. The sewage containing detergent can also decompose and clean the oil stains in the smoke exhaust pipe, thereby cleaning the smoke exhaust pipe and further improving the oil fume extraction effect. Brief Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the oil fume extractor.

[0025] Figure 2 It is a three-dimensional structural schematic diagram when the flue casing is connected to the smoke exhaust pipe.

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

[0027] Figure 4 It is a structural sectional view when the flue casing is connected to the smoke exhaust pipe.

[0028] Figure 5 It is Figure 1 an enlarged view of the structure at position A in

[0029] Figure 6 It is Figure 1 a partial structural sectional view at B-B in

[0030] Figure 7 It is Figure 6 a partial structural sectional view at C-C in

[0031] Figure 8 It is a schematic diagram of the usage state of the range hood.

[0032] Figure 9 It is a structural sectional view when the flue casing is connected to the water storage box in the second embodiment.

[0033] In the figure, 1. Flue casing; 11. Oil fume suction inlet; 12. Air extraction port; 13. Liquid discharge outlet; 2. Fan; 21. Housing; 211. Air inlet; 212. Air outlet; 22. Impeller; 23. Motor; 3. Smoke exhaust pipe; 31. Liquid discharge inlet; 32. Water-vapor separation pipe; 321. Sewage discharge port; 322. Water storage box; 323. Drainage interface; 324. Inspection port; 33. Isolation net plate; 331. Filter hole; 332. Baffle; 333. Pull ring; 34. Liquid level sensor; 4. Oil stain cleaning device; 41. Concentrated liquid storage tank; 42. Diluted liquid storage tank; 43. Foam synthesizer; 431. Air inlet; 432. Diluted liquid 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. Trap; 6. Electric push rod; 61. Lifting door; 7. Water storage box; 71. Communication port; 72. Partition board. Specific Embodiments

[0034] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0035] Embodiment 1:

[0036] As Figure 1As shown in the figure, a sewage discharge structure of an oil fume extractor. The oil fume extractor includes a flue shell 1, a fan 2, an exhaust pipe 3, and an oil stain cleaning device 4. The flue shell 1 is flat, with a rectangular upper part and an inverted triangular lower part. Along the width direction, a long strip-shaped oil fume suction port 11 is provided on the upper side wall of the flue shell 1. A suction port 12 is provided on the side wall of the lower part of the flue shell 1, and this suction port 12 is higher than the bottom surface of the flue shell 1. The oil stain cleaning device 4 includes a concentrated liquid storage tank 41, a dilution liquid 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 and the dilution liquid storage tank 42 are connected. The concentrated liquid in the concentrated liquid storage tank 41 can enter the dilution liquid storage tank 42 in proportion with water for dilution. Combined with Figure 5 As shown in the figure, 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. There is also an installation port 464 on the distribution pipe 46. The foam synthesizer 43 is installed on the installation port 464, and the foam synthesizer 43 has an air inlet 431 and a dilution liquid inlet 432. Among them, the air inlet 431 is connected to an air pump for entering the air required for synthesizing foam, and the dilution liquid inlet 432 is connected to the dilution liquid storage tank 42. A solenoid valve 463 for controlling on-off is installed at the tap water inlet 461, which is connected to external tap water for flushing the foam. The two foam outlets 462 are respectively connected to the spray box 44 and the spray head 45 through pipelines. The dilution liquid can enter the foam synthesizer 43 to generate foam. The means for the foam synthesizer 43 to synthesize foam is the prior art. The spray box 44 is fixed on the top of the flue shell 1, and spray holes 441 are provided on its side wall. Combined with Figures 2 to 4 As shown in the figure, the fan 2 includes a casing 21, an impeller 22 arranged inside the casing 21, and a motor 23 for driving the impeller 22 to rotate. The air inlet 211 of the casing 21 is provided on the side wall, and the air outlet 212 is provided on the bottom surface. The casing 21 is fixed on the side of the flue shell 1, and the air inlet 211 of the casing 21 is in relative communication with the suction port 12 of the flue shell 1. The exhaust pipe 3 is horizontally arranged. At the inlet end of the exhaust pipe 3, it bends upward and is butted against the air outlet 212 of the casing 21. A sewage discharge port 321 is also provided on the bottom surface of the exhaust pipe 3, and this sewage discharge port 321 is close to the outlet end of the exhaust pipe 3 for connecting a sewage discharge pipe. The sewage discharge structure includes a U-shaped water seal bend pipe 5. The bottom surface of the flue shell 1 is an arc-shaped concave circular arc surface. A liquid discharge outlet 13 is provided at the lowest position of the bottom surface of the flue shell 1. A liquid discharge inlet 31 is provided on the side wall of the exhaust pipe 3, and this liquid discharge inlet 31 is close to the inlet end of the exhaust pipe 3. The liquid discharge outlet 13 is higher than the liquid discharge inlet 31. The water seal bend pipe 5 is fixedly connected between the flue shell 1 and the exhaust pipe 3, and one end of the water seal bend pipe 5 is vertically upward and connected to the liquid discharge outlet 13, and the other end is vertically upward and then bent laterally and connected to the liquid discharge inlet 31.

[0037] Specifically, the spray box 44 is strip-shaped and fixed to the top inside the flue shell 1 in the width direction. The cross-section of the spray box 44 is rectangular, having two side walls opposite to the inner side walls of the flue shell 1, and a row of spray holes 441 are opened on both of these 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 walls of the flue shell 1. The gap width between the outer side wall of the spray box 44 and the inner side wall of the flue shell 1 is 3 mm - 15 mm, and 5 mm is preferably selected in this embodiment. The spray box 44 is higher than the oil fume suction port 11. Therefore, an electric push rod 6 and a flat lifting door 61 are also provided inside the flue shell 1. The electric push rod 6 is vertically fixed on the inner wall of the flue shell 1, the lifting door 61 is fixed to the driving end of the electric push rod 6, and the lifting door 61 abuts against 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 inside the casing 21 of the fan 2. The spray head 45 is located at the inclined top of the casing 21 and faces the impeller 22. That is, the spray head 45 and the air outlet 212 are respectively located on the radial two sides of the center line of the casing 21.

[0038] Combined with Figure 6 、 Figure 7 As shown, the exhaust pipe 3 includes a water-gas separation pipe 32 at the outlet end. The water-gas separation pipe 32 is a circular pipe, and a sewage outlet 321 is opened on the bottom surface of the water-gas separation pipe 32. The bottom of the water-gas separation pipe 32 has a water storage box 322. The sewage outlet 321 is located above the water storage box 322 and is relatively communicated with the inner cavity of the water storage box 322. A drain interface 323 is provided on the side wall of the water storage box 322. The drain interface 323 is higher than the bottom surface of the water storage box 322 and is used to connect the sewage pipe. An isolation net plate 33 is also provided inside the water-gas separation pipe 32. The isolation net plate 33 has filter holes 331. The isolation net plate 33 is laid on the inner bottom surface of the water-gas separation pipe 32 and covers the sewage outlet 321. A cylindrical baffle 332 is vertically fixed on the lower side surface of the isolation net plate 33. The outer side surface of the baffle 332 is close to or abuts against the edge of the sewage outlet 321. The lower end of the baffle 332 extends downward into the water storage box 322, and there is a spacing between the lower end edge of the baffle 332 and the bottom surface of the water storage box 322. The lower end edge of the baffle 332 is lower than the drain interface 323. An inspection opening 324 is opened at the inclined top of the water-gas separation pipe 32. The inspection opening 324 faces the isolation net plate 33 below. A pull ring 333 is provided on the isolation net plate 33 for easy maintenance. A liquid level sensor 34 is installed at the drain interface 323. When the sewage pipe is blocked and there is backflow, the liquid level sensor 34 can give an alarm.

[0039] Combined with Figure 8As shown in the figure, when the range hood is being cleaned, the concentrated liquid in the concentrated liquid storage tank 41 and water enter the dilution liquid storage tank 42 in proportion to form a dilution liquid. The electric push rod 6 drives the lifting door 61 upward, and the lifting door 61 closes the oil fume suction port 11. The dilution liquid in the dilution liquid 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 respectively through pipelines. The spray head 45 directly sprays foam on the impeller 22 inside the machine shell 21. When the spray box 44 is filled with foam, it sprays out from the spray holes 441 and adheres to the inner side wall of the flue shell 1. After the flue shell 1 is filled with foam, it is left standing for a set time. During this standing process, the fan 2 can also rotate in the reverse direction at a low speed. The fan 2 blows air into the flue shell 1, and the upward reverse air flow inside the flue shell 1 can act on the foam, thereby holding up the foam, avoiding the foam from sinking too quickly, delaying the contact and decomposition time between the foam and the oil stains on the inner side wall of the flue shell 1, and improving the oil stain cleaning effect. After the set standing time, the distribution pipe 46 can supply water to the spray box 44 and the spray head 45 for flushing the flue shell 1 and the machine shell 21. The sewage flushed from the flue shell 1 can flow through the drain outlet 13, pass through the water seal bend 5, and then enter the exhaust pipe 3. The sewage inside the machine shell 21 of the fan 2 directly discharges into the exhaust pipe 3 from the air outlet 212. The sewage in the exhaust pipe 3 flows to the sewage outlet 321 and falls from the sewage outlet 321 into the water storage box 322. The sewage in the water storage box 322 discharges into the sewage pipe from the drain interface 323. When the range hood cleaning is completed, water will be stored in both the water seal bend 5 and the water storage box 322 to form a water seal. Then, when the range hood is extracting oil fume, the water seal in the water seal bend 5 can prevent the flue gas in the exhaust pipe 3 from returning to the flue shell 1 again, thereby avoiding pressure relief in the flue shell 1 and ensuring the oil fume extraction efficiency. The water seal in the water storage box 322 can not only prevent oil fume from entering the sewage pipe, but also prevent the smell in the sewage pipe from entering the exhaust pipe 3 and flowing back into the room.

[0040] Embodiment 2:

[0041] The structure of this quick connector is basically the same as that of Embodiment 1, and the difference is as Figure 9 shown. A water storage box 7 is also connected between the flue shell 1 and the exhaust pipe 3. Two communication ports 71 are respectively opened in the upper part of the water storage box 7. One communication port 71 is opened on the top wall and is communicated with the drain outlet 13, and the other communication port 71 is opened on the side wall and is communicated with the drain 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 drain inlet 31 and has a spacing from 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 illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0043] Although terms such as flue casing 1, oil fume suction inlet 11, air extraction opening 12, etc. are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is only for more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A sewage discharge structure for an oil fume exhaust machine. The oil fume exhaust machine includes a flue shell (1) with an oil fume suction inlet (11) opened at the upper part, a fan (2), and an oil stain cleaning device (4). The air inlet (211) of the fan (2) is communicated with the lower part of the flue shell (1), and a smoke exhaust pipe (3) is connected to the air outlet (212) of the fan (2). The oil stain cleaning device (4) includes a spraying member arranged in the flue shell (1). The sewage discharge structure includes a liquid discharge outlet (13) opened at the bottom of the flue shell (1), and it is characterized in that, The exhaust pipe (3) is provided with a liquid drainage inlet (31), and the liquid drainage inlet (31) is not higher than the liquid drainage outlet (13). A U-shaped water seal bend pipe (5) is also connected between the flue shell (1) and the exhaust pipe (3). One end of the water seal bend pipe (5) faces upward and is communicated with the liquid drainage outlet (13), and the other end faces upward and is communicated with the liquid drainage inlet (31). The exhaust pipe (3) is also provided with a sewage 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 liquid drainage outlet (13) is arranged at the lowest position of the bottom surface of the flue shell (1). The liquid drainage inlet (31) is arranged on the side wall of the exhaust pipe (3), and the liquid drainage outlet (13) is higher than the liquid drainage inlet (31).

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

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

5. The sewage drainage structure of the range hood according to claim 1 or 2 or 3, characterized in that The exhaust pipe (3) includes a water and gas separation pipe (32) at the outlet end. The sewage outlet (321) is arranged on the bottom surface of the water and gas separation pipe (32). The bottom of the water and gas separation pipe (32) has a water storage box (322). The sewage outlet (321) is located above the water storage box (322) and is communicated with the inner cavity of the water storage box (322). A drain interface (323) is arranged on the side wall of the water storage box (322). A baffle (332) is also arranged in the water and gas separation pipe (32) and is circumferentially arranged along the edge of the sewage outlet (321) and extends downward into the water storage box (322). The lower edge of the baffle (332) is lower than the drain interface (323).

6. The sewage discharge structure of the range hood according to claim 5, characterized in that, A separation net plate (33) covering the sewage outlet (321) is also arranged in the water and gas separation pipe (32). The baffle (332) is cylindrical and is arranged close to the edge of the sewage outlet (321). The upper edge of the baffle (332) is fixed on the lower side surface of the separation net plate (33). There is a gap between the lower edge of the baffle (332) and the bottom surface of the water storage box (322).

7. The sewage discharge structure of the range hood according to claim 4, wherein, The spray member includes a spray box (44) fixed on the top of the flue shell (1). A plurality of spray holes (441) are arranged on the side wall of the spray box (44). The plurality of spray holes (441) face the inner side wall of the flue shell (1). A lifting door (61) and an electric push rod (6) for driving the lifting of the lifting door (61) are also arranged in the flue shell (1). When the lifting door (61) rises, it can cover the oil fume suction port (11).

8. The sewage discharge structure of the range hood according to claim 7, characterized in that, The flue duct shell (1) is flat, the spray box (44) is strip-shaped and arranged along the width direction of the flue duct shell (1), and the cross-section of the spray box (44) is rectangular. The gap width between the side wall of the spray box (44) provided with spray holes (441) and the side wall of the flue duct 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 includes a distribution pipe (46) installed with a foam synthesizer (43). The foam synthesizer (43) has an air inlet (431) and a diluent inlet (432). The distribution pipe (46) has a tap water inlet (461) and two foam outlets (462). 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 for an oil fume exhaust machine. The oil fume exhaust machine includes a flue shell (1) with an oil fume suction inlet (11) opened at the upper part, a fan (2), and an oil stain cleaning device (4). The air inlet (211) of the fan (2) is communicated with the lower part of the flue shell (1), and a smoke exhaust pipe (3) is connected to the air outlet (212) of the fan (2). The oil stain cleaning device (4) includes a spraying member arranged in the flue shell (1). The sewage discharge structure includes a liquid discharge outlet (13) opened at the bottom of the flue shell (1), and is characterized in that, A liquid discharge inlet (31) is provided on the exhaust pipe (3), 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 duct shell (1) and the 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 communicated with 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 from 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). A sewage discharge port (321) is also provided on the exhaust pipe (3).

Images