Range hood and cleaning method thereof

Abstract

The invention provides a range hood and a cleaning method thereof, and belongs to the technical field of range hoods. The problems that an existing range hood and a cleaning method thereof are poor in cleaning effect and low in use reliability are solved. The range hood comprises a flue shell, a draught fan and a distribution pipe, 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, a spraying box is installed at the top in the flue shell, spraying holes are formed in the spraying box, a spraying head facing an impeller is installed in the draught fan, and the distribution pipe is provided with two foam outlets. The two foam outlets are communicated with the spraying box and the spraying head respectively, the distribution pipe is further provided with a tap water inlet, the foam synthesizer is provided with a diluent inlet, the bottom of the flue shell is communicated with a smoke exhaust pipe through a trap, and a drain outlet is formed in the smoke exhaust pipe. The range hood and the cleaning method thereof can improve the cleaning effect and ensure the use reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of range hoods and relates to a range hood and a cleaning method thereof. 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, and the normally open solenoid valve corresponds to the position of the oil leakage hole, and the oil leakage hole can be opened or closed. During cleaning, hot water is sprayed from the nozzle on the supply pipe to the filter, and the hot water 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 to drain.

[0004] The hot water sprayed by the above-mentioned cleaning device will flow downward quickly and it is difficult to contact the inner wall for a long time, so the cleaning effect on the inner wall is poor, and the ability of hot water to decompose oil stains is limited. If the hot water is replaced with detergent, the cleaning device will spray the detergent on the filter, the inner wall of the box and other components to decompose the oil stains and flow downward, and the detergent remaining on the internal components is corrosive, and long-term use affects the life of the range hood. In addition, the kitchen usually has only one sewage pipe connected to the sink, so 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, the 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 the oil smoke is discharged. These will 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 oil stain adhesion. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and to provide a range hood and a cleaning method thereof, which can improve the cleaning effect and ensure the reliability of use.

[0006] The objective of the present invention can be achieved through the following technical scheme: a range hood, comprising a flue shell with a fume suction port opened on the upper part, a fan and a distribution pipe equipped with a foam synthesizer, the air inlet of the fan being connected with the lower part of the flue shell, the air outlet of the fan being connected with the exhaust pipe, and a door panel capable of sealing the fume suction port is also provided in the flue shell, characterized in that a spray box is installed on the top of the flue shell, the spray box is provided with a spray hole opposite to the inner wall of the flue shell, a spray head facing the impeller is installed in the fan, the distribution pipe has two foam outlets, and the two foam outlets are respectively connected with the spray box and the spray head, the distribution pipe also has a tap water inlet for connecting to an external water source, the foam synthesizer has a dilution liquid inlet connected to a dilution tank, the bottom of the flue shell is connected with the exhaust pipe through a trap, and a sewage outlet is provided on the exhaust pipe.

[0007] The distribution pipe of the present application has a tap water inlet and two foam outlets, and the foam synthesizer has at least a diluent inlet, that is, two cleaning processes of foam decomposition and water flushing are realized at two locations of the flue shell and the fan through two inlets and two outlets to improve the cleaning effect. Specifically, the diluent is diluted and mixed in a certain proportion by the concentrate and water in advance and stored in the diluent storage tank. When cleaning is required, the door panel is driven to cover the oil fume suction port, and the diluent storage tank quantitatively delivers the diluent to the foam synthesizer. The foam synthesized in the foam synthesizer is respectively delivered to the spray box and the spray head through two foam outlets. After the foam fills the spray box, it is sprayed from the spray hole. Since the spray hole is directly opposite to the inner wall of the flue shell, the foam will be pre-attached to the inner wall of the flue shell, and the oil pollution of the inner wall of the flue shell with heavy oil pollution will be decomposed, and then flow down along the inner wall of the flue shell until the entire flue shell cavity is filled. The spray head faces the impeller, and the foam first adheres to the impeller, decomposing the oil on the impeller with heavy oil pollution, and then gradually fills the entire fan cavity, so that the impeller is immersed in the foam, which has a better cleaning effect. In the process of foam decomposition of oil pollution, the foam synthesizer can continuously deliver foam or intermittently deliver foam. After a predetermined time, the foam synthesizer stops synthesizing foam, the tap water inlet is opened, and the tap water enters the spray box and the spray head from the two foam outlets through the distribution pipe. The spray hole of the spray box directly sprays tap water on the inner wall of the flue shell to flush, and the spray head directly sprays tap water on the impeller to flush, improve the cleaning effect, avoid the chemical substances in the foam from remaining for a long time and corroding the flue shell and the fan, and increase the service life. The sewage flushed from the flue shell flows to the bottom of the flue shell and is discharged into the exhaust pipe through the water trap. The sewage flushed from the fan is directly discharged into the exhaust pipe from the air outlet, and the sewage in the exhaust pipe is discharged from the sewage outlet. Therefore, the present application sets a spray box and a spray head in the flue shell and the fan respectively, and the distribution pipe has a tap water inlet, so as to realize the two processes of oil decomposition and water flushing at the two positions of the flue shell and the fan, and improve the cleaning effect. In addition, the present application uses a foam synthesizer to synthesize the foam medium, which can fill the entire flue shell cavity and the fan cavity. The foam can stay for a long time and adhere to the inner wall of the flue shell and the impeller, and has a good cleaning effect.

[0008] Furthermore, the sewage outlet on the smoke exhaust pipe of the present application can be connected to the kitchen sewage pipe. In order to prevent backflow when the sewage pipe is blocked, causing sewage to flow back into the range hood and damage the range hood, the present application breaks the inertial thinking that the smoke exhaust pipe is only used for smoke exhaust, and connects the bottom of the flue shell with the smoke exhaust pipe through a water trap, and the smoke exhaust pipe is connected to the sewage pipe through the sewage outlet, so that the smoke exhaust pipe originally used for smoke exhaust plays the role of connecting the flue shell and the sewage pipe. Even if the sewage pipe has backflow due to blockage, 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 outlet and will not flow back into the flue shell. This also makes it unnecessary to install electronic components such as solenoid valves at the bottom of the flue shell to control the switch of sewage at the bottom 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 bottom of the flue shell is connected to the exhaust pipe. Then, when the range hood is working normally to absorb oil fumes, the fan sucks air from the bottom of the flue shell and discharges it into the exhaust pipe. At this time, if the bottom of the flue shell and the exhaust pipe are not blocked, the negative pressure generated at the bottom of the flue shell may suck the oil fumes in the exhaust pipe back into the flue shell, thereby affecting the oil fume absorption effect of the range hood. For this reason, the present application breaks the inertial thinking that the water trap is only used in the drainage system to prevent odor from flowing back into the room, and connects the water trap between the flue shell and the exhaust pipe. After cleaning, the water in the water trap can form a liquid seal to prevent the oil fumes in the exhaust pipe from being drawn back into the flue shell. That is, the water trap plays a role in preventing the flue shell from being depressurized, thereby ensuring the oil fume absorption effect of the range hood without installing electronic components such as solenoid valves.

[0010] In the above range hood, the flue shell is flat, the fume suction port is opened on the front side of the upper part of the flue shell, and the fume suction port is long and arranged along the transverse direction of the flue shell, the spray box is long and arranged along the transverse direction of the flue shell, and the spray box is fixed at the top of the flue shell and higher than the fume suction port. The flat flue shell has a larger inner wall, so that the oil stains on the inner wall are fully in contact with the foam, improving the decomposition efficiency. The long fume suction port arranged along the transverse direction makes the oil smoke enter more evenly, and the oil stains attached to the inner wall of the flue shell are also more evenly, avoiding local oil stains that are too heavy and difficult to clean. The spray box is long and can spray foam evenly into the flue shell to improve the cleaning effect. Further, the foam needs to be attached to the inner wall of the flue shell to avoid the foam from sinking as much as possible, and the distance between the two inner walls of the flat flue shell is small, and the foam can be attached between the two inner walls, prolonging the foam residence and decomposition time, and improving the cleaning effect.

[0011] In the above range hood, an electric push rod with a driving end facing upward is vertically fixed in the flue shell, and a mounting seat facing the oil fume suction port is fixed at the driving end of the electric push rod. The door panel is in a long strip shape and is arranged horizontally, and one side of the door panel is fixed on the mounting seat, and the other side is against the inner wall of the flue shell. When cleaning, the electric push rod drives the door panel to rise and cover the oil fume suction port to prevent foam from overflowing from the oil fume suction port. Since the outer side of the door panel is difficult to clean, the outer side of the door panel is against the inner wall of the flue shell. When the door panel is in an open state to absorb oil fume, the outer side of the door panel against the inner wall of the flue shell can avoid the adhesion of oil stains.

[0012] In the above range hood, the cross section of the spray box is rectangular, the spray holes are provided on the outer wall of the spray box at intervals along the circumferential direction, the outer wall of the spray box is opposite to the inner wall of the flue shell and forms a clearance gap, and the width of the clearance gap is less than 15mm, and the spray holes face the inner wall of the flue shell. Foam enters the clearance gap from the spray holes, and the narrow clearance gap allows the foam to fully adhere to the inner wall of the flue shell, preventing the foam from falling directly from the middle of the two inner walls.

[0013] In the above range hood, the fan includes a casing that is cylindrical and arranged on one side of the flue casing, the air inlet is opened on the end surface of the casing, the air outlet is opened at the bottom of the outer peripheral surface of the casing, the spray head is fixed on the upper part of the inner peripheral surface of the casing and tilted toward the impeller, and the spray head and the air outlet are respectively located on both sides of the radial direction of the impeller. The spray head and the air outlet are respectively located on both sides of the radial direction of the impeller to increase the distance between the two as much as possible, so as to avoid the foam sprayed by the spray head from being discharged from the air outlet too quickly, increase the residence time of the foam in the fan, and improve the cleaning effect.

[0014] In the above range hood, the range hood further comprises a concentrated liquid storage tank, which is connected to a diluent storage tank, the diluent storage tank also has a water supply interface, and the foam synthesizer has an air inlet. The user only needs to add concentrated liquid to the concentrated liquid storage tank once, and the concentrated liquid can be diluted with water in proportion and stored in the diluent storage tank, without frequent addition, which is more convenient to use. The air inlet is connected to an air pump, and the diluent in the diluent storage tank enters the foam synthesizer and mixes with air to generate foam.

[0015] In the above range hood, the flue shell has a concave bottom surface, a drain outlet is provided at the lowest position of the flue shell bottom surface, a drain inlet is provided on the side wall of the exhaust pipe, and the drain outlet is higher than the drain inlet, the water trap is in a U-shaped tube shape, and the two ends of the water trap face upward and are respectively connected to the drain outlet and the drain inlet. The concave bottom surface of the flue shell plays a role of converging flow, so that the sewage in the flue shell can be fully discharged from the drain outlet to ensure the cleaning effect, the drain outlet is higher than the drain inlet, so that the water seal liquid level in the water trap pipe has a certain distance from the drain outlet, thereby preventing the fan from sucking the water in the water trap pipe back into the flue shell when extracting range fumes, ensuring the stability and reliability of use.

[0016] In the above-mentioned range hood, the exhaust pipe is horizontally arranged and located below the fan, 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 sewage flushed down from the flue shell also contains detergent components. For this reason, the exhaust pipe is horizontally arranged, so that the sewage can flow along the exhaust pipe after entering from the sewage inlet at the inlet end of the exhaust pipe until it flows out from the sewage outlet at the outlet end. The sewage containing detergent can also decompose and clean the oil stains in the exhaust pipe, thereby improving the cleanliness of the exhaust pipe and indirectly improving the effect of extracting oil smoke. At the same time, even if the sewage backflows from the sewage outlet into the exhaust pipe due to backflow of sewage from the sewage outlet, the sewage can be directly discharged from the outlet end of the exhaust pipe next to it, and will not backflow 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.

[0017] In the above-mentioned range hood, the exhaust pipe also includes a water-gas separation pipe located at the outlet end, the above-mentioned sewage outlet 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 outlet 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 has a drainage interface, and the water-gas separation pipe is also provided with an isolation mesh plate for covering the sewage outlet, and a baffle plate extending vertically downward into the water storage box is fixed on the lower side surface of the isolation mesh plate, the baffle plate is cylindrical and is arranged close to the edge of the sewage outlet, the lower edge of the baffle plate is lower than the drainage interface, and there is a distance between the lower edge of the baffle plate and the bottom surface of the water storage box. 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.

[0018] A method for cleaning a range hood, the range hood comprising a foam synthesizer, characterized in that the bottom of a flue shell of the range hood is connected to a smoke exhaust pipe through a water trap, and the smoke exhaust pipe is provided with a sewage outlet, the cleaning method comprising the following steps:

[0019] a. Start cleaning: close the oil fume suction port of the flue shell;

[0020] b. Filling with foam: Use a foam synthesizer to fill the inner cavity of the flue shell and the inner cavity of the fan with foam until the flue shell and the fan are filled with foam;

[0021] c. Reverse thrust foam: Start the fan and control the fan's impeller to rotate in the opposite direction. The fan's air outlet draws air from the exhaust pipe, and the fan's air inlet supplies air to the flue shell, so that an upward airflow is continuously generated in the flue shell;

[0022] d. Flushing foam: Stop the fan and use tap water to flush the inner wall of the flue shell and the impeller of the fan. Discharge the sewage flushed from the flue shell into the smoke exhaust pipe through the trap. Discharge the sewage flushed from the fan into the smoke exhaust pipe through the air outlet. The sewage in the smoke exhaust pipe is discharged through the sewage outlet.

[0023] The cleaning method uses a foam synthesizer to synthesize foam, and realizes two cleaning processes of foam decomposition and water flushing at two locations of the flue shell and the fan, so as to improve the cleaning effect. Specifically, the diluent is diluted in advance by a certain ratio of concentrated liquid and water and stored in a diluent storage tank. The diluent storage tank quantitatively transports the diluent to the foam synthesizer. The foam synthesizer synthesizes the diluent and air into foam and fills the flue shell cavity and the fan cavity respectively. After the foam is filled, the oil pollution of the flue shell inner wall and the impeller with heavy oil pollution can be decomposed, and the cleaning effect is good.

[0024] In particular, step c of the cleaning method utilizes the reversal of the fan to generate a reverse airflow, that is, an airflow is generated in the fan from the air outlet to the air inlet, which can effectively prevent the foam in the fan from flowing out of the air outlet, and an upward airflow is generated in the flue shell. The airflow can support the foam in the flue shell, effectively preventing the foam from settling downward due to gravity, thereby allowing the fan and the foam in the flue shell to stay for a long time, thereby fully contacting the inner wall of the flue shell and the impeller of the fan and decomposing the oil stains, thereby improving the cleaning effect.

[0025] After a predetermined time, the foam synthesizer stops synthesizing foam, and the inner wall of the flue shell and the impeller are flushed with tap water to prevent the chemical substances in the foam from remaining for a long time and corroding the flue shell and the fan, thereby increasing the service life. The sewage flushed from the flue shell flows to the bottom of the flue shell and is discharged into the exhaust pipe. The sewage flushed from the fan is directly discharged into the exhaust pipe from the air outlet, and the sewage in the exhaust pipe is discharged from the sewage outlet. Therefore, this cleaning method can achieve two processes of oil decomposition and clean water flushing at two locations of the flue shell and the fan, thereby improving the cleaning effect.

[0026] Furthermore, in step d of the cleaning method, the sewage cleaned is discharged into the smoke exhaust pipe, and then discharged into the sewage pipe from the sewage outlet. Therefore, even if the sewage pipe is blocked and backflows occur, the sewage in the sewage pipe will flow back into the smoke exhaust pipe. The sewage in the smoke exhaust pipe can be discharged from the smoke exhaust outlet and will not flow back into the flue shell. This also makes it unnecessary to install electronic components such as solenoid valves at the bottom of the flue shell to control the switch of the sewage at the bottom of the flue shell, thereby ensuring the reliability and service life of the range hood.

[0027] The water trap is set between the flue shell and the exhaust pipe. After cleaning, 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.

[0028] In the above-mentioned range hood cleaning method, a door panel and an electric push rod for driving the door panel to rise and fall are provided in the flue shell. In the above-mentioned step a, the door panel is pushed up by the electric push rod to cover the oil fume suction port. The electric push rod pushes the door panel to close the oil fume suction port, which has high stroke accuracy and structural stability, and prevents foam from overflowing from the oil fume suction port.

[0029] In the above-mentioned range hood cleaning method, in the above-mentioned step c, the speed of the impeller of the fan in the reverse direction is 30r / min to 150r / min, and the duration is 5min to 15min. Within this speed range, the airflow generated by the fan can hold the foam to prevent the foam from depositing downward, and can also prevent the foam from being destroyed by excessive airflow, so that the foam is fully in contact with the inner wall of the flue shell and the impeller within a predetermined time, thereby improving the cleaning effect.

[0030] In the above-mentioned range hood cleaning method, the range hood further comprises a distribution pipe, a spray box is installed at the top of the flue shell, and a spray head is installed in the fan. In the above-mentioned step b, the foam synthesizer delivers foam to the spray box and the spray head respectively through the distribution pipe, the spray box sprays foam on the inner wall of the flue shell, and the spray head sprays foam on the impeller; in the above-mentioned step d, tap water is delivered to the spray box and the spray head through the distribution pipe, the spray box sprays tap water on the inner wall of the flue shell to rinse, and the spray head sprays tap water on the impeller to rinse. The foam synthesizer delivers foam to the spray box and the spray head respectively, the foam fills the spray box, and the spray box sprays the foam to the inner wall of the flue shell. The foam will be pre-attached to the inner wall of the flue shell, decompose the oil on the inner wall of the flue shell with heavy oil pollution, and then flow downward along the inner wall of the flue shell until the entire flue shell cavity is filled. The spray head sprays foam towards the impeller. The foam first adheres to the impeller, decomposing the oil on the impeller with heavy oil pollution, and then gradually fills the entire fan cavity, making the impeller immersed in the foam, which has a better cleaning effect. Tap water is also sprayed and rinsed through the spray box and the spray head, simplifying the structure and realizing the two processes of foam decomposition and clean water rinsing.

[0031] Compared with the prior art, the range hood and the cleaning method thereof have the following advantages:

[0032] 1. Since the foam synthesizer of the present application has a diluent inlet, the distribution pipe has a tap water inlet and two foam outlets, that is, two cleaning processes of foam decomposition and clean water flushing are implemented at two locations of the flue shell and the fan through two inlets and two outlets to improve the cleaning effect.

[0033] 2. Since a clearance gap is formed between the spray box and the inner wall of the flue shell, the spray hole is directly opposite to the inner wall of the flue shell, and the flue shell is flat, the foam will be pre-attached to the inner wall of the flue shell and then fill the entire inner cavity, avoiding the foam from sinking as much as possible and prolonging the residence and decomposition time of the foam. The foam can stay and adhere to the inner wall of the flue shell and the impeller for a long time, thereby improving the cleaning effect.

[0034] 3. The distribution pipe has a tap water interface. The spray hole of the spray box directly sprays tap water on the inner wall of the flue shell for flushing. The spray head directly sprays tap water on the impeller for flushing, which improves the cleaning effect, avoids the chemical substances in the foam from remaining for a long time and corroding the flue shell and the fan, and increases the service life.

[0035] 4. Since the present application connects the bottom of the flue shell with the smoke exhaust pipe through a water trap, and the smoke exhaust pipe is connected with the sewage pipe through the sewage outlet, even if the sewage pipe is blocked and backflows, 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 outlet and will not flow back into the flue shell. This also means that there is no need to install electronic components such as solenoid valves at the bottom of the flue shell to control the switch of the sewage at the bottom of the flue shell, thereby ensuring the reliability and service life of the range hood.

[0036] 5. Since the water trap is connected between the flue shell and the exhaust pipe, the water in the water trap can form a liquid seal after cleaning 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.

[0037] 6. 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.

[0038] 7. Since step c of the cleaning method utilizes the reverse rotation of the fan to generate reverse airflow, that is, an oblique upward airflow is generated in the fan, which can effectively prevent the foam in the fan from flowing out of the air outlet, and an upward airflow is generated in the flue shell. This airflow can support the foam in the flue shell and effectively prevent the foam from settling downward due to gravity, thereby allowing the fan and the foam in the flue shell to stay for a long time, thereby fully contacting the inner wall of the flue shell and the impeller of the fan and decomposing the oil stains, thereby improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural diagram of a range hood.

[0040] Figure 2 yes Figure 1A magnified view of the structure at center

[0041] Figure 3 It is a schematic diagram of the three-dimensional structure when the flue shell is connected to the exhaust pipe.

[0042] Figure 4 It is a three-dimensional structural diagram from another perspective when the flue shell is connected to the exhaust pipe.

[0043] Figure 5 It is a structural cross-sectional view of the flue shell when it is connected to the exhaust pipe.

[0044] Figure 6 yes Figure 1 Partial structural cross-sectional view at BB in the middle.

[0045] Figure 7 yes Figure 6 Partial structural cross-sectional view at CC in the middle.

[0046] Figure 8 This is a schematic diagram of the range hood in use.

[0047] Fig. 9 It is a flow chart of the range hood cleaning method.

[0048] In the figure, 1, flue shell; 11, oil smoke inlet; 12, exhaust port; 13, drainage outlet; 14, clearance; 2, fan; 21, casing; 211, air inlet; 212, air outlet; 22, impeller; 23, motor; 3, exhaust pipe; 31, drainage 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; 3 33. Pull ring; 34. Liquid level sensor; 4. Distribution pipe; 41. Tap water inlet; 411. Solenoid valve; 42. Foam outlet; 43. Installation port; 5. Foam synthesizer; 51. Dilution inlet; 52. Air inlet; 6. Concentrate storage tank; 61. Metering pump; 7. Dilution storage tank; 71. Water supply interface; 8. Spray box; 81. Spray hole; 9. Spray head; 10. Electric push rod; 101. Mounting seat; 102. Door panel; 1001. Trap. DETAILED DESCRIPTION

[0049] 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.

[0050] like Figure 1As shown, a range hood comprises a flue shell 1, a fan 2, a smoke exhaust pipe 3, a distribution pipe 4, a foam synthesizer 5, a diluent storage tank 7 and a concentrate storage tank 6. The flue shell 1 is flat, with a rectangular upper portion and an inverted triangle lower portion, and the bottom surface of the lower portion is a concave arc surface. A long strip of oil fume suction port 11 is horizontally opened on the side wall of the upper portion of the flue shell 1, and an exhaust port 12 is opened on the side wall of the lower portion of the flue shell 1, and the exhaust port 12 is higher than the bottom surface of the flue shell 1. The fan 2 includes a casing 21, an impeller 22 disposed in the casing 21, and a motor 23 for driving the impeller 22 to rotate. The casing 21 is cylindrical and disposed on one side of the flue casing 1. An air inlet 211 is provided on the side wall of the casing 21 facing the flue casing 1. The air inlet 211 is relatively connected to the air outlet 12 of the flue casing 1. An air outlet 212 is provided at the bottom of the outer peripheral surface of the casing 21. The air outlet 212 is disposed downward. The smoke exhaust pipe 3 is disposed horizontally, and the inlet end of the smoke exhaust pipe 3 is bent upward and docked with the air outlet 212 of the casing 21. A sewage outlet 321 is also provided 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 pipe.

[0051] Combination Figure 2 As shown, one end of the distribution pipe 4 is a tap water inlet 41, and the other end is connected to a tee to form two foam outlets 42. The distribution pipe 4 also has a mounting port 43. The foam synthesizer 5 is installed on the mounting port 43 of the distribution pipe 4, so that the outlet of the foam synthesizer 5 is connected to the distribution pipe 4. The foam synthesizer 5 also has an air inlet 52 and a diluent inlet 51, wherein the air inlet 52 is connected to the air pump for the air required for synthesizing foam, the diluent inlet 51 is connected to the diluent storage tank 7, and the tap water inlet 41 is used to connect to an external tap water pipe, where a solenoid valve 411 for controlling the on-off is installed. The concentrated liquid storage tank 6 and the diluent storage tank 7 are respectively located on both sides of the lower part of the flue shell 1 in the horizontal direction. The concentrated liquid storage tank 6 is connected to the diluent storage tank 7, and the diluent storage tank 7 is also provided with a water supply interface 71. The concentrated liquid in the concentrated liquid storage tank 6 is diluted with water in proportion and stored in the diluent storage tank 7. Figures 3 to 5 As shown, a spray box 8 is installed at the top of the flue shell 1, and the spray box 8 is provided with a spray hole 81 opposite to the inner wall of the flue shell 1. A spray head 9 facing the impeller 22 is installed in the casing 21 of the fan 2, and two foam outlets 42 of the foam synthesizer 5 are respectively connected to the spray box 8 and the spray head 9 through pipelines. A U-shaped tubular water trap 1001 is connected between the bottom of the flue shell 1 and the smoke exhaust pipe 3, and a drainage outlet 13 is provided at the lowest position of the bottom surface of the flue shell 1. A drainage inlet 31 is provided on the side wall of the smoke exhaust pipe 3, and the drainage inlet 31 is close to the inlet end of the smoke exhaust pipe 3. The drainage outlet 13 is higher than the drainage inlet 31. One end of the water trap 1001 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.

[0052] Specifically, the spray box 8 is in the shape of an elongated strip and is arranged transversely along the flue shell 1, and the spray box 8 is fixed at the top inside the flue shell 1 and is higher than the oil fume suction port 11. The cross section of the spray box 8 is rectangular, and there are a plurality of spray holes 81 which are circumferentially spaced apart on the outer wall of the spray box 8. The outer wall of the spray box 8 is parallel to the inner wall of the flue shell 1 and forms a clearance gap 14, and the width of the clearance gap 14 is less than 15 mm, preferably 5 mm in this embodiment, and the spray hole 81 faces the inner wall of the flue shell 1. An electric push rod 10 is vertically fixed on the inner wall of the flue shell 1. The driving end of the electric push rod 10 is vertically facing upward and fixed with a mounting seat 101. A rectangular door panel 102 is fixed on the side of the mounting seat 101 facing the oil fume suction port 11. The door panel 102 is attached to the inner wall of the flue shell 1. When the electric push rod 10 pushes the door panel 102 upward, the door panel 102 can cover the oil fume suction port 11. The spray head 9 is fixed on the inclined top of the housing 21, and the spray head 9 and the air outlet 212 are respectively located on both sides of the radial direction of the impeller 22.

[0053] 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, the 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 rectangular water storage box 322, 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, and the side wall of the water storage box 322 is provided with a drainage interface 323, 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 inner 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 baffle plate 332 is circumferentially arranged along the edge of the sewage outlet 321, that is, the outer side of the baffle plate 332 is close to or abuts against the edge of the sewage outlet 321. The lower end of the baffle plate 332 extends downward into the water storage box 322, and 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 a signal when the sewage pipe is blocked and backflow occurs.

[0054] Combination Figure 8 , Fig. 9 As shown, a method for cleaning a range hood comprises the following steps:

[0055] a. Start cleaning: When cleaning starts, the electric push rod 10 pushes the door panel 102 upward, and the door panel 102 covers the oil fume suction port 11;

[0056] b. Filling foam: start the foam synthesizer 5, the diluent storage tank 7 quantitatively delivers the diluent to the foam synthesizer 5 through the metering pump 61, and the air pump quantitatively delivers air to the foam synthesizer 5. The foam synthesizer 5 synthesizes the diluent and the air into foam and enters the distribution pipe 4. The synthesis means is the existing technology. The two foam outlets 42 of the distribution pipe 4 respectively deliver foam to the spray box 8 and the spray head 9 through pipelines. After the foam in the spray box 8 is full, it is sprayed out from the spray hole 81 and attached to the inner wall of the flue shell 1 until the foam fills the inner cavity of the flue shell 1. The spray head 9 directly sprays foam to the impeller 22 in the casing 21 until the foam fills the inner cavity of the flue shell 1.

[0057] c. Reverse foam push: start the fan 2 and control the impeller 22 of the fan 2 to rotate in the opposite direction, the air outlet 212 of the fan 2 draws air from the smoke exhaust pipe 3, and the air inlet 211 of the fan 2 supplies air to the flue shell 1, so that an airflow from the air outlet 212 to the air inlet 211 is generated in the casing 21, reducing the discharge of foam from the air outlet 212, and continuously generating an upward airflow in the flue shell 1 to support the foam in the flue shell 1 and reduce the downward deposition of foam, wherein the rotation speed of the fan 2 is 30r / min~150r / min, and the duration is 5min~15min. In this embodiment, the rotation speed of the fan 2 is preferably 90r / min, and the duration is 10 minutes. During this period, the spray box 8 and the spray head 9 can continuously spray foam into the flue shell 1 and the casing 21, and can also spray foam intermittently.

[0058] d. Flushing foam: the fan 2 is stopped, the metering pump 61 stops delivering the diluent, the air pump stops delivering air, the solenoid valve 411 at the tap water inlet 41 is opened, the tap water pipe delivers tap water to the distribution pipe 4, the distribution pipe 4 delivers the tap water to the spray box 8 and the spray head 9 through the two foam outlets 42, the spray box 8 sprays the tap water on the inner wall of the flue shell 1 to flush, the spray head 9 sprays the tap water on the impeller 22 to flush, the sewage flushed in the flue shell 1 is discharged into the smoke exhaust pipe 3 through the water trap 1001, the sewage flushed in the fan 2 is discharged into the smoke exhaust pipe 3 through the air outlet 212, the sewage in the smoke exhaust pipe 3 is discharged into the water storage box 322 through the sewage outlet 321, the sewage in the water storage box 322 is discharged into the sewage pipe through the drainage interface 323, and after stopping cleaning, the water trap 1001 and the water storage box 322 are both liquid-sealed.

[0059] 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.

[0060] 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 range hood, comprising a flue shell (1) with a fume suction port (11) formed in the upper portion, a fan (2), and a distribution pipe (4) equipped with a foam synthesizer (5), 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 fume exhaust pipe (3), and a door panel (102) capable of covering the fume suction port (11) is further provided in the flue shell (1), characterized in that: A spray box (8) is installed at the top of the flue shell (1), and the spray box (8) is provided with a spray hole (81) opposite to the inner wall of the flue shell (1). A spray head (9) facing the impeller (22) is installed in the fan (2). The distribution pipe (4) has two foam outlets (42), and the two foam outlets (42) are respectively connected to the spray box (8) and the spray head (9). The distribution pipe (4) also has a tap water inlet (41) for connecting to an external water source. The foam synthesizer (5) has a dilution liquid inlet (51) connected to a dilution tank. The bottom of the flue shell (1) is connected to the smoke exhaust pipe (3) through a water trap (1001), and the smoke exhaust pipe (3) is provided with a sewage outlet (321).

2. The range hood according to claim 1, characterized in that: The flue shell (1) is flat, the oil fume suction port (11) is opened on the front side of the upper part of the flue shell (1), and the oil fume suction port (11) is long and arranged along the transverse direction of the flue shell (1), the spray box (8) is long and arranged along the transverse direction of the flue shell (1), and the spray box (8) is fixed at the top of the flue shell (1) and is higher than the oil fume suction port (11).

3. The range hood according to claim 2, characterized in that: An electric push rod (10) with a driving end facing upward is vertically fixed in the flue shell (1), and a mounting seat (101) facing the oil fume suction port (11) is fixed to the driving end of the electric push rod (10). The door panel (102) is in the shape of an elongated strip and is arranged in the transverse direction, with one side of the door panel (102) fixed to the mounting seat (101) and the other side abutting against the inner wall of the flue shell (1).

4. The range hood according to claim 3, characterized in that: The spray box (8) has a rectangular cross section, and has a plurality of spray holes (81) arranged on the outer wall of the spray box (8) at intervals along the circumferential direction. The outer wall of the spray box (8) is opposite to the inner wall of the flue shell (1) and forms a clearance gap (14), and the width of the clearance gap (14) is less than 15 mm. The spray holes (81) face the inner wall of the flue shell (1).

5. The range hood according to claim 4, characterized in that: The fan (2) comprises a casing (21) which is cylindrical and arranged on one side of the flue casing (1); the air inlet (211) is provided on an end surface of the casing (21); the air outlet (212) is provided at the bottom of the outer peripheral surface of the casing (21); the spray head (9) is fixed to the upper part of the inner peripheral surface of the casing (21) and is inclined toward the impeller (22); and the spray head (9) and the air outlet (212) are respectively located on both sides of the radial direction of the impeller (22).

6. The range hood according to any one of claims 1 to 5, characterized in that: The range hood further comprises a concentrated liquid storage tank (6), the concentrated liquid storage tank (6) being in communication with a diluent storage tank (7), the diluent storage tank (7) further comprising a water supply interface (71), and the foam synthesizer (5) comprising an air inlet (52).

7. The range hood according to claim 6, characterized in that: The flue shell (1) has a concave bottom surface, a drainage outlet (13) is provided at the lowest position of the bottom surface of the flue shell (1), a drainage inlet (31) is provided on the side wall of the smoke exhaust pipe (3), and the drainage outlet (13) is higher than the drainage inlet (31), the water trap (1001) is in a U-shaped tube shape, and both ends of the water trap (1001) face upward and are respectively connected to the drainage outlet (13) and the drainage inlet (31).

8. A method for cleaning a range hood, the range hood comprising a foam synthesizer (5), characterized in that: The bottom of the flue shell (1) of the range hood is connected to the smoke exhaust pipe (3) via a water trap (1001), and the smoke exhaust pipe (3) is provided with a sewage outlet (321). The cleaning method comprises the following steps: a. Start cleaning: close the oil fume suction port (11) of the flue shell (1); b. Filling with foam: filling the inner cavity of the flue shell (1) and the inner cavity of the fan (2) with foam through a foam synthesizer (5) until the flue shell (1) and the fan (2) are filled with foam; c. Reverse foaming: starting the fan (2) and controlling the impeller (22) of the fan (2) to rotate in the reverse direction, so that the air outlet (212) of the fan (2) draws air from the smoke exhaust pipe (3), and the air inlet (211) of the fan (2) supplies air to the flue shell (1), so that an upward airflow is continuously generated in the flue shell (1); d. Flushing foam: The fan (2) is stopped, and the inner wall of the flue shell (1) and the impeller (22) of the fan (2) are flushed with tap water. The sewage flushed from the flue shell (1) is discharged into the smoke exhaust pipe (3) through the trap (1001). The sewage flushed from the fan (2) is discharged into the smoke exhaust pipe (3) through the air outlet (212). The sewage in the smoke exhaust pipe (3) is discharged through the sewage outlet (321).

9. The range hood cleaning method according to claim 8, characterized in that: A door panel (102) and an electric push rod (10) for driving the door panel (102) to rise and fall are provided in the flue shell (1). In the above step a, the electric push rod (10) pushes the door panel (102) to rise and cover the oil fume suction port (11).

10. The range hood cleaning method according to claim 8, characterized in that: The range hood further comprises a distribution pipe (4), a spray box (8) is installed at the top of the flue shell (1), and a spray head (9) is installed in the fan (2). In the above step b, the foam synthesizer (5) delivers foam to the spray box (8) and the spray head (9) respectively through the distribution pipe (4), the spray box (8) sprays foam toward the inner wall of the flue shell (1), and the spray head (9) sprays foam toward the impeller (22); in the above step d, tap water is delivered to the spray box (8) and the spray head (9) through the distribution pipe (4), the spray box (8) sprays tap water toward the inner wall of the flue shell (1) to wash, and the spray head (9) sprays tap water toward the impeller (22) to wash.

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