An oil fume purifier and its cleaning method

Abstract

The present invention provides an oil fume machine and a cleaning method thereof, belonging to the technical field of oil fume machines. It solves the problems of poor cleaning effect and low use reliability of existing oil fume machines and their cleaning methods. This oil fume machine includes a flue shell, a fan, and a distribution pipe. The air inlet of the fan is connected to the lower part of the flue shell, and the air outlet of the fan is connected to an exhaust pipe. A spray box is installed at the top inside the flue shell, and the spray box is provided with spray holes. A spray head facing the impeller is installed inside the fan. The distribution pipe has two foam outlets, and the two foam outlets are respectively connected to the spray box and the spray head. The distribution pipe also has a tap water inlet, and the foam synthesizer has a diluent inlet. The bottom of the flue shell is connected to the exhaust pipe through a water seal bend, and a sewage outlet is provided on the exhaust pipe. This oil fume machine and its cleaning method can improve the cleaning effect and ensure the use reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of range hoods, and relates to a range hood and a cleaning method thereof. Background Art

[0002] A range hood is a household appliance used in a kitchen to suck out the oil fumes generated during cooking. After the long-term development of range hoods, from the initial top-suction range hoods to the side-suction range hoods, range hoods are no longer limited to a simple tool for removing kitchen oil fumes, 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, as disclosed in the patent document (application number: 202210463061.6), a cooking device and its control method, 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 inlet solenoid valve through a water inlet pipe, and the other end of the 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. During cleaning, hot water is sprayed from the nozzle on the supply pipe onto the filter screen, and the hot water 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] The hot water sprayed by the above cleaning device will flow downward rapidly and is difficult to contact the inner wall for a long time. Therefore, the cleaning effect on the inner wall is poor. Moreover, the ability of hot water to decompose oil stains is limited. If the hot water is replaced with detergent, the cleaning device sprays the detergent on components such as the filter screen and the inner wall of the box to decompose the oil stains and flow downward. However, the detergent remaining on the internal components is corrosive, and long-term use will affect the service life of the range hood. And there is usually only one sewage discharge pipe connected to the sink in the kitchen. Therefore, this oil leakage hole will communicate with 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, stubborn oil stains will adhere to the bottom of the volute, and the temperature is also relatively high during oil fume exhaust. All these will result in low reliability and short 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 range hood and its cleaning method, which can improve the cleaning effect and ensure the use reliability.

[0006] The object of the present invention can be achieved by the following technical solutions: A range hood includes a flue shell with an oil fume suction port opened at the upper part, a fan, and a distribution pipe equipped with a foam synthesizer. The air inlet of the fan is communicated with the lower part of the flue shell, and the air outlet of the fan is connected with an exhaust pipe. A door panel capable of covering the oil fume suction port is further provided in the flue shell. It is characterized in that a spray box is installed at the top in the flue shell. The spray box is provided with spray holes 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 communicated 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 diluent inlet connected to a dilution tank. The bottom of the flue shell is communicated with the exhaust pipe through a water seal bend, and a sewage discharge port is opened 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 clean water flushing are realized for two positions of the flue duct shell and the fan through the two inlets and two outlets to improve the cleaning effect. Specifically, the diluent is pre-diluted and mixed with water in a certain proportion and stored in the diluent storage tank. When cleaning is required, the driving door plate covers the oil fume suction port, and the diluent storage tank quantitatively conveys the diluent to the foam synthesizer. Foam is synthesized in the foam synthesizer and conveyed to the spray box and the spray head respectively through the two foam outlets. After the spray box is filled with foam, it sprays out from the spray holes. Since the spray holes are directly opposite to the inner side wall of the flue duct shell, the foam will adhere to the inner side wall of the flue duct shell in advance, decompose the oil stain on the inner side wall of the flue duct shell with heavy oil stain, and then flow down along the inner side wall of the flue duct shell until the entire inner cavity of the flue duct shell is filled. The spray head faces the impeller, the foam first adheres to the impeller, decomposes the oil stain on the impeller with heavy oil stain, and then gradually fills the entire inner cavity of the fan, so that the impeller is immersed in the foam, having a better cleaning effect. During the process of foam decomposing the oil stain, the foam synthesizer can continuously convey foam or intermittently convey foam. After a predetermined time, the foam synthesizer stops synthesizing foam, the tap water inlet is opened, and tap water enters the spray box and the spray head respectively from the two foam outlets through the distribution pipe. The spray holes of the spray box directly spray tap water on the inner side wall of the flue duct shell for flushing, and the spray head directly sprays tap water on the impeller for flushing, improving the cleaning effect, avoiding the long-term residue of chemical substances in the foam from corroding the flue duct shell and the fan, and prolonging the service life. The sewage flushed down in the flue duct shell flows to the bottom of the flue duct shell and is discharged into the exhaust pipe through the water seal bend, and the sewage flushed down in the fan is directly discharged into the exhaust pipe from the air outlet, and the sewage in the exhaust pipe is then discharged from the sewage outlet. Therefore, in the present application, a spray box and a spray head are respectively arranged in the flue duct shell and the fan, and the distribution pipe has a tap water inlet, so that two processes of oil stain decomposition and clean water flushing are realized for two positions of the flue duct shell and the fan, improving the cleaning effect. Moreover, the present application uses a foam synthesizer to synthesize a foam medium, which can fill the entire inner cavity of the flue duct shell and the fan, and the foam can stay and adhere to the inner side wall of the flue duct shell and the impeller for a long time, having a better cleaning effect.

[0008] Further, the sewage outlet on the exhaust pipe of the present application can be connected to the kitchen sewage pipe. To prevent backflow when the sewage pipe is blocked, resulting in sewage flowing back into the range hood and damaging it, the present application breaks the inertial thinking that the exhaust pipe is only used for exhausting smoke. The bottom of the flue shell is connected to the exhaust pipe through a water seal bend. The exhaust pipe is connected to the sewage pipe through the sewage outlet, enabling the original exhaust pipe for exhausting smoke to also function as a connection between the flue shell and the sewage pipe. Then, even if backflow occurs due to blockage in the sewage pipe, the sewage in the sewage pipe will flow back into the exhaust pipe, and the sewage in the exhaust pipe can be discharged from the exhaust port, without flowing 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 opening and closing of sewage discharge at the bottom of the flue shell, thereby ensuring the reliability and service life of the range hood.

[0009] Furthermore, to reduce the use of electronic components such as solenoid valves, the bottom of the flue shell is connected to the exhaust pipe. When the range hood is working normally to suck in oil fumes, the fan sucks air at the bottom of the flue shell and discharges it into the exhaust pipe. At this time, if there is no blockage between the bottom of the flue shell and the exhaust pipe, negative pressure may be generated at the bottom of the flue shell, and then suck the oil fumes in the exhaust pipe back into the flue shell, thus affecting the oil fume suction effect of the range hood. Therefore, the present application also breaks the inertial thinking that the water seal bend pipe is only used in the drainage system to prevent odor from flowing back into the room. The water seal bend pipe is connected between the flue shell and the exhaust pipe. After cleaning, the water in the water seal bend pipe can form a liquid seal, preventing the oil fumes in the exhaust pipe from being sucked back into the flue shell, that is, the water seal bend pipe plays a role in preventing the flue shell from relieving pressure, thereby ensuring the oil fume suction 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 above-mentioned oil fume suction inlet is opened on the front side of the upper part of the flue shell, and the oil fume suction inlet is strip-shaped and arranged horizontally along the flue shell. The spray box is strip-shaped and arranged horizontally along the flue shell, and the spray box is fixed at the top inside the flue shell and is higher than the oil fume suction inlet. The flat flue shell has a larger inner wall area, enabling the oil stains and foam on the inner wall to come into full contact, improving the decomposition efficiency. The strip-shaped and horizontally arranged oil fume suction inlet allows the oil fumes to enter more evenly, and the oil stains attached to the inner wall of the flue shell are also more evenly distributed, avoiding excessive local oil stains that are difficult to clean. The spray box is strip-shaped and can spray foam evenly into the flue shell, improving the cleaning effect. Further, the foam needs to adhere to the inner wall of the flue shell and avoid sinking as much as possible. The distance between the two inner walls of the flat flue shell is small, and the foam can adhere between the two inner walls, prolonging the residence and decomposition time of the foam and improving the cleaning effect.

[0011] In the above-mentioned range hood, an electric push rod with its driving end facing upward is vertically fixed inside the flue shell. An installation seat facing the side of the oil fume suction port is fixed to the driving end of the electric push rod. The door plate is strip-shaped and arranged horizontally, and one side of the door plate is fixed to the installation seat, while the other side abuts against the inner side wall of the flue shell. During cleaning, the electric push rod drives the door plate to rise and cover the oil fume suction port, preventing foam from overflowing from the oil fume suction port. Since the outer side of the door plate is difficult to clean, the outer side of the door plate is made to abut against the inner side wall of the flue shell. When the door plate is in the open state for oil fume suction, the outer side of the door plate that abuts against the inner side wall of the flue shell can prevent oil stains from adhering to it.

[0012] In the above-mentioned range hood, the cross-section of the spray box is rectangular. A number of the above-mentioned spray holes are arranged at intervals along the circumferential direction on the outer side wall of the spray box. The outer side wall of the spray box faces the inner side wall of the flue shell and forms a clearance for accommodation, and the width of this clearance for accommodation is less than 15 mm. The spray holes face the inner side wall of the flue shell. The foam enters the clearance for accommodation from the spray holes. The relatively small width of the clearance for accommodation enables the foam to fully adhere to the inner side wall of the flue shell, preventing the foam from directly falling down from the middle of the two inner side walls.

[0013] In the above-mentioned range hood, the fan includes a casing in the shape of a cylinder and arranged on one side of the flue shell. The above-mentioned air inlet is opened on the end face of the casing, and the air outlet is opened at the bottom of the outer peripheral surface of the casing. The spray head is fixed to the upper part of the inner peripheral surface of the casing and is inclined towards the impeller, and the spray head and the air outlet are respectively located on both sides of the impeller in the radial direction. The spray head and the air outlet are respectively located on both sides of the impeller in the radial direction to increase the distance between the two as much as possible, thereby preventing the foam sprayed out by the spray head from being discharged from the air outlet too quickly, increasing the residence time of the foam in the fan, and improving the cleaning effect.

[0014] In the above-mentioned range hood, the range hood further includes a concentrated liquid storage tank, which is communicated with the diluted liquid storage tank. The diluted liquid storage tank also has a water supply interface. The foam synthesizer has an air inlet. The user only needs to add the concentrated liquid to the concentrated liquid storage tank once, and the concentrated liquid can be diluted with water in proportion and stored in the diluted liquid storage tank, without the need for frequent addition, which is relatively convenient to use. The air inlet is connected to an air pump, and the diluted liquid in the diluted liquid storage tank enters the foam synthesizer and is mixed 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] This cleaning method uses a foam synthesizer to synthesize foam, achieving two cleaning processes of foam decomposition and fresh water rinsing at two positions: the flue shell and the fan, in order to improve the cleaning effect. Specifically, the diluent is pre-diluted and mixed with water in a certain proportion and stored in the diluent storage tank. The diluent storage tank quantitatively supplies the diluent to the foam synthesizer. The foam synthesizer synthesizes the diluent and air into foam and fills the inner cavity of the flue shell and the inner cavity of the fan respectively. After the foam is filled, it can decompose the oil stains on the inner side wall of the flue shell with heavy oil stains and the impeller, having a good cleaning effect.

[0024] Especially, step c of this cleaning method uses the reverse rotation of the fan to generate a reverse air flow, that is, an air flow from the air outlet to the air inlet direction is generated inside the fan, which can effectively prevent the foam inside the fan from flowing out from the air outlet. And an upward air flow is generated inside the flue shell, and this air flow can hold up the foam inside the flue shell, effectively preventing the foam from depositing downward due to gravity, so that the foam inside the fan and the flue shell stays for a long time, and thus fully contacts and decomposes the oil stains on the inner side wall of the flue shell and the impeller of the fan to improve the cleaning effect.

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

[0026] Furthermore, in step d of this cleaning method, the sewage rinsed down is discharged into the exhaust pipe, and then the exhaust pipe discharges it into the sewage pipe from the sewage outlet. Then, even if the sewage pipe backs up due to blockage, the sewage in the sewage pipe will back up into the exhaust pipe, and the sewage in the exhaust pipe can be discharged from the exhaust port and will not back up 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 opening and closing of the sewage discharge at the bottom of the flue shell, thereby ensuring the use reliability and service life of the range hood.

[0027] The setting of the water seal bend between the flue shell and the exhaust pipe can form a liquid seal with the water in the water seal bend after cleaning, avoiding the backflow of the oil fume in the exhaust pipe into the flue shell, that is, this water seal bend plays a role in preventing the flue shell from relieving pressure, thereby ensuring the oil fume suction effect of the range hood without installing electronic components such as solenoid valves.

[0028] In the above-described cleaning method of the range hood, a door panel and an electric push rod for driving the door panel to lift are provided inside the flue shell. In the above step a, the electric push rod is used to push the door panel upward to cover the oil fume suction port. The electric push rod pushing the door panel to seal the oil fume suction port has high stroke accuracy and structural stability, and prevents the foam from overflowing from the oil fume suction port.

[0029] In the above-described cleaning method of the range hood, in the above step c, the reverse rotation speed of the impeller of the blower is 30 r / min to 150 r / min, and the duration is 5 min to 15 min. Within this speed range, the airflow generated by the blower can hold the foam, preventing the foam from depositing downward, and can also prevent the foam from being damaged due to excessive airflow, enabling the foam to fully contact the inner side wall of the flue shell and the impeller within a predetermined time, thereby improving the cleaning effect.

[0030] In the above-described cleaning method of the range hood, the range hood further includes a distribution pipe. A spray box is installed at the top inside the flue shell, and a spray head is installed inside the blower. In the above step b, the foam synthesizer conveys foam to the spray box and the spray head respectively through the distribution pipe. The spray box sprays foam onto the inner side wall of the flue shell, and the spray head sprays foam onto the impeller. In the above step d, tap water is conveyed to the spray box and the spray head through the distribution pipe. The spray box sprays tap water to wash the inner side wall of the flue shell, and the spray head sprays tap water to wash the impeller. The foam synthesizer conveys foam to the spray box and the spray head respectively. The foam fills the spray box, and the spray box sprays the foam onto the inner side wall of the flue shell. The foam will adhere to the inner side wall of the flue shell in advance, decomposing the oil stains on the inner side wall of the flue shell with heavier oil stains, and then flowing downward along the inner side wall of the flue shell until the entire inner cavity of the flue shell is filled. The spray head sprays foam onto the impeller. The foam first adheres to the impeller, decomposing the oil stains on the impeller with heavier oil stains, and then gradually fills the entire inner cavity of the blower, submerging the impeller in the foam, resulting in a better cleaning effect. Tap water is also sprayed and washed through the spray box and the spray head, simplifying the structure and realizing two processes of foam decomposition and clean water washing.

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

[0032] 1. Since the foam synthesizer of the present application has a diluent inlet, and the distribution pipe has a tap water inlet and two foam outlets, that is, two cleaning processes of foam decomposition and clean water washing are realized for two positions of the flue shell and the blower through two inlets and two outlets, so as to improve the cleaning effect.

[0033] 2. Since a clearance gap is formed between the spray box and the inner side wall of the flue duct housing, the spray holes directly face the inner side wall of the flue duct housing, and the flue duct housing is flat, the foam will first adhere to the inner side wall of the flue duct housing and then fill the entire inner cavity, as much as possible avoiding the foam from sinking and prolonging the residence and decomposition time of the foam. The foam can stay and adhere to the inner side wall of the flue duct housing and the impeller for a long time, improving the cleaning effect.

[0034] 3. This distribution pipe has a tap water interface. The spray holes of the spray box directly spray tap water onto the inner side wall of the flue duct housing for flushing, and the spray heads directly spray tap water onto the impeller for flushing, improving the cleaning effect and avoiding the chemical substances in the foam from remaining for a long time and corroding the flue duct housing and the fan, thus increasing the service life.

[0035] 4. Since the bottom of the flue duct housing of this application is connected to the exhaust pipe through a water seal bend, and the exhaust pipe is connected to the sewage pipe through a sewage outlet, even if the sewage pipe backs up due to blockage, the sewage in the sewage pipe will flow back into the exhaust pipe, and the sewage in the exhaust pipe can be discharged from the exhaust port and will not flow back into the flue duct housing. This also makes it unnecessary to install electronic components such as solenoid valves at the bottom of the flue duct housing to control the opening and closing of sewage discharge at the bottom of the flue duct housing, thereby ensuring the reliability and service life of the range hood.

[0036] 5. Since the water seal bend is connected between the flue duct housing and the exhaust pipe, the water in the water seal bend can form a liquid seal after cleaning, avoiding the backflow of the oil fume in the exhaust pipe into the flue duct housing, that is, this water seal bend plays a role in preventing the flue duct housing from relieving pressure, thereby ensuring the oil fume extraction effect of the range hood without installing electronic components such as solenoid valves.

[0037] 6. Since the sewage flushed down in the flue duct housing still 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 extraction effect.

[0038] 7. Since step c of this cleaning method uses the reverse rotation of the fan to generate a reverse air flow, that is, an obliquely upward air flow is generated in the fan, which can effectively prevent the foam in the fan from flowing out of the air outlet, and an upward air flow is generated in the flue duct housing. This air flow can hold up the foam in the flue duct housing, effectively preventing the foam from depositing downward due to gravity, so that the foam in the fan and the flue duct housing stays for a long time, and thus fully contacts and decomposes the oil stains with the inner side wall of the flue duct housing and the impeller of the fan to improve the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0040] Figure 2 is 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] Figure 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 in the figure, an oil fume extractor includes a flue shell 1, a fan 2, an exhaust pipe 3, a distribution pipe 4, a foam synthesizer 5, a diluent storage tank 7 and a concentrated liquid storage tank 6. The flue shell 1 is flat, with a rectangular upper part and an inverted triangular lower part, and the bottom surface of the lower part is a concave arc surface. A long strip-shaped oil fume suction port 11 is transversely opened on the side wall of the upper part of the flue shell 1, and an air extraction port 12 is opened on the side wall of the lower part of the flue shell 1, and this air extraction port 12 is higher than the bottom surface of the flue shell 1. The fan 2 includes a casing 21, an impeller 22 arranged in the casing 21 and a motor 23 for driving the impeller 22 to rotate. The casing 21 is cylindrical and arranged on one side of the flue shell 1. An air inlet 211 is opened on the side wall of one end of the casing 21 facing the flue shell 1, and this air inlet 211 is in relative communication with the air extraction port 12 of the flue shell 1. An air outlet 212 is opened at the bottom of the outer peripheral surface of the casing 21, and this air outlet 212 is arranged downward. The exhaust pipe 3 is horizontally arranged, and the inlet end of the exhaust pipe 3 is bent upward and docked with the air outlet 212 of the casing 21. A sewage discharge port 321 is also opened 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 and is used to connect to a sewage discharge pipe.

[0051] Combined with Figure 2 As shown in the figure, 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. There is also an installation port 43 on the distribution pipe 4, and the foam synthesizer 5 is installed on the installation port 43 of the distribution pipe 4, so that the outlet of the foam synthesizer 5 is in communication with the distribution pipe 4. The foam synthesizer 5 also has an air inlet 52 and a diluent inlet 51. Among them, the air inlet 52 is connected to an air pump for entering the air required for synthesizing foam, the diluent inlet 51 is connected to the diluent storage tank 7, the tap water inlet 41 is used to connect to an external tap water pipe, and a solenoid valve 411 for controlling on-off is installed there. The concentrated liquid storage tank 6 and the diluent storage tank 7 are respectively located on the two lateral sides of the lower part of the flue shell 1, and the concentrated liquid storage tank 6 is in communication with the diluent storage tank 7. There is also a water supply interface 71 on the diluent storage tank 7. The concentrated liquid in the concentrated liquid storage tank 6 is diluted with water in proportion and stored in the diluent storage tank 7. Combined with Figures 3 to 5 As shown in the figure, a spray box 8 is installed at the top inside the flue shell 1. The spray box 8 is provided with spray holes 81 opposite to the inner side wall of the flue shell 1. A spray head 9 facing the impeller 22 is installed inside the casing 21 of the fan 2. The 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 seal 1001 is connected between the bottom of the flue shell 1 and the exhaust pipe 3. A liquid discharge outlet 13 is opened at the lowest position of the bottom surface of the flue shell 1. A liquid discharge inlet 31 is opened 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. One end of the water seal 1001 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.

[0052] Specifically, the spray box 8 is strip-shaped and arranged horizontally along the flue shell 1, and the spray box 8 is fixed to 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. There are several spray holes 81 which are circumferentially spaced on the outer side wall of the spray box 8. The outer side wall of the spray box 8 is parallel and opposite to the inner side wall of the flue shell 1 to form a clearance 14, and the width of this clearance 14 is less than 15 mm, preferably 5 mm in this embodiment. The spray holes 81 face the inner side wall of the flue shell 1. An electric push rod 10 is vertically fixed on the inner side wall of the flue shell 1. The driving end of the electric push rod 10 faces vertically upward and is 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 abuts against the inner side 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 to the inclined top of the casing 21, and the spray head 9 and the air outlet 212 are located on the radial two sides of the impeller 22 respectively.

[0053] 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. A sewage discharge port 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 discharge port 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. A separation net plate 33 is also provided inside the water-gas separation pipe 32. The separation net plate 33 has filter holes 331. The separation net plate 33 is laid on the inner bottom surface of the water-gas separation pipe 32 and covers the sewage discharge port 321. A cylindrical baffle 332 is vertically fixed on the lower side surface of the separation net plate 33. The baffle 332 is circumferentially arranged along the edge of the sewage discharge port 321, that is, the outer side surface of the baffle 332 is close to or abuts against the edge of the sewage discharge port 321. The lower end of the baffle 332 extends downward into the water storage box 322, and there is a gap 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 is opposite to the separation net plate 33 below. A pull ring 333 is provided on the separation 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 backflow occurs, the liquid level sensor 34 can give a signal.

[0054] Combined with Figure 8 、 Figure 9 As shown, a cleaning method for an oil fume machine includes the following steps:

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

[0056] b. Fill with foam: Start the foam synthesizer 5. The diluent storage tank 7 quantitatively transports the diluent to the foam synthesizer 5 through the metering pump 61, and the air pump quantitatively transports air to the foam synthesizer 5. The foam synthesizer 5 synthesizes the diluent and air into foam and enters the distribution pipe 4. This synthesis method is a prior art. The two foam outlets 42 of the distribution pipe 4 transport foam to the spray box 8 and the spray head 9 respectively through pipelines. After the spray box 8 is filled with foam, the foam sprays out from the spray holes 81 and adheres to the inner side wall of the flue shell 1 until the inner cavity of the flue shell 1 is filled with foam. The spray head 9 directly sprays foam on the impeller 22 in the machine shell 21 until the inner cavity of the flue shell 1 is filled with foam.

[0057] c. Push the foam back: Start the fan 2 and control the impeller 22 of the fan 2 to rotate in the reverse direction. The air outlet 212 of the fan 2 sucks air from the exhaust pipe 3, and the air inlet 211 of the fan 2 sends air to the flue shell 1, so that an air flow from the air outlet 212 to the air inlet 211 is generated in the machine shell 21, reducing the discharge of foam from the air outlet 212. An upward air flow is continuously generated in the flue shell 1 to hold up the foam in the flue shell 1 and reduce the downward deposition of the foam. Among them, the rotation speed of the fan 2 is 30 r / min to 150 r / min, and the duration is 5 min to 15 min. In this embodiment, the rotation speed of the fan 2 is preferably 90 r / 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 machine shell 21, or spray foam intermittently.

[0058] d. Rinse the foam: The fan 2 stops running, the metering pump 61 stops transporting the diluent, the air pump stops transporting air, the solenoid valve 411 at the tap water inlet 41 is opened, the tap water pipe transports tap water to the distribution pipe 4, and the distribution pipe 4 transports the tap water to the spray box 8 and the spray head 9 through the two foam outlets 42. The spray box 8 sprays tap water on the inner side wall of the flue shell 1 for rinsing, and the spray head 9 sprays tap water on the impeller 22 for rinsing. The sewage rinsed from the flue shell 1 is discharged into the exhaust pipe 3 through the water seal 1001, and the sewage rinsed from the fan 2 is discharged into the exhaust pipe 3 through the air outlet 212. The sewage in the exhaust pipe 3 is discharged into the water storage box 322 through the sewage outlet 321, and the sewage in the water storage box 322 is discharged into the sewage pipe through the drainage interface 323. After the cleaning is stopped, liquid seals are achieved in both the water seal 1001 and the water storage box 322.

[0059] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0060] Although terms such as flue casing 1, oil fume suction inlet 11, and air extraction outlet 12 are used more frequently in this text, 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 limitation is contrary to the spirit of the present invention.

Claims

1. An oil fume exhaust machine, comprising a flue shell (1) with an oil fume suction inlet (11) opened at the upper part, a fan (2), and a distribution pipe (4) installed with a foam synthesizer (5), wherein an air inlet (211) of the fan (2) is communicated with the lower part of the flue shell (1), an air outlet (212) of the fan (2) is connected with an exhaust pipe (3), and a door panel (102) capable of covering the oil fume suction inlet (11) is further arranged in the flue shell (1), and is characterized in that, A spray box (8) is installed at the top inside the flue duct shell (1). The spray box (8) is provided with spray holes (81) facing the inner side wall of the flue duct shell (1). A spray head (9) is installed inside the fan (2) and faces the impeller (22). The distribution pipe (4) has two foam outlets (42), and the two foam outlets (42) are respectively communicated with 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 diluent inlet (51) connected to a dilution tank. The bottom of the flue duct shell (1) is communicated with the exhaust pipe (3) through a water seal (1001). A sewage outlet (321) is provided on the exhaust pipe (3).

2. The range hood according to claim 1, characterized in that, The flue duct shell (1) is flat. The above-mentioned oil fume suction port (11) is opened on the front side of the upper part of the flue duct shell (1), and the oil fume suction port (11) is strip-shaped and arranged along the transverse direction of the flue duct shell (1). The spray box (8) is strip-shaped and arranged along the transverse direction of the flue duct shell (1), and the spray box (8) is fixed at the top inside the flue duct 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 the driving end facing upward is vertically fixed inside the flue duct shell (1). An installation seat (101) facing the side of the oil fume suction port (11) is fixed at the driving end of the electric push rod (10). The door panel (102) is strip-shaped and arranged along the transverse direction, and one side of the door panel (102) is fixed on the installation seat (101), and the other side abuts against the inner side wall of the flue duct shell (1).

4. The range hood according to claim 3, wherein, The cross-section of the spray box (8) is rectangular. There are several spray holes (81) which are circumferentially spaced and arranged on the outer side wall of the spray box (8). The outer side wall of the spray box (8) faces the inner side wall of the flue duct shell (1) and forms a clearance (14), and the width of the clearance (14) is less than 15 mm. The spray holes (81) face the inner side wall of the flue duct shell (1).

5. The range hood according to claim 4, wherein The fan (2) includes a casing (21) which is cylindrical and arranged on one side of the flue duct shell (1). The above-mentioned air inlet (211) is opened on the end face of the casing (21), and the air outlet (212) is opened at the bottom of the outer peripheral surface of the casing (21). The spray head (9) is fixed on the upper part of the inner peripheral surface of the casing (21) and is inclined to face the impeller (22), and the spray head (9) and the air outlet (212) are respectively located on both sides of the impeller (22) in the radial direction.

6. The range hood according to any one of claims 1 to 5, characterized in that The range hood also includes a concentrated liquid storage tank (6), and the concentrated liquid storage tank (6) is communicated with the diluent storage tank (7). The diluent storage tank (7) also has a water supply interface (71). The foam synthesizer (5) has an air inlet (52).

7. The range hood according to claim 6, characterized in that, The flue shell (1) has a concave bottom surface, and 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 smoke exhaust pipe (3), and the liquid discharge outlet (13) is higher than the liquid discharge inlet (31). The water seal bend (1001) is in a U-shaped tubular form, and both ends of the water seal bend (1001) face upward and are respectively connected to the liquid discharge outlet (13) and the liquid discharge inlet (31).

8. A cleaning method for an oil fume machine, the oil fume machine 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) through a water seal bend (1001). A sewage discharge port (321) is provided on the smoke exhaust pipe (3). The cleaning method includes the following steps: a. Start cleaning: Close the oil fume suction port (11) of the flue shell (1). b. Fill with foam: Fill 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. Push the foam backward: Start the fan (2) and control the impeller (22) of the fan (2) to rotate in the reverse direction. The air outlet (212) of the fan (2) sucks air from the smoke exhaust pipe (3), and the air inlet (211) of the fan (2) sends air to the flue shell (1), so that an upward air flow is continuously generated in the flue shell (1). d. Rinse the foam: Stop the fan (2), rinse the inner side wall of the flue shell (1) and the impeller (22) of the fan (2) with tap water. The sewage rinsed from the flue shell (1) is discharged into the smoke exhaust pipe (3) through the water seal bend (1001), and the sewage rinsed 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 discharge port (321).

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

10. The cleaning method of the range hood according to claim 8, characterized in that, The range hood further includes a distribution pipe (4). A spray box (8) is installed at the top in the flue shell (1), and a spray head (9) is installed in the fan (2). In step b above, the foam synthesizer (5) conveys foam to the spray box (8) and the spray head (9) respectively through the distribution pipe (4). The spray box (8) sprays foam onto the inner side wall of the flue shell (1), and the spray head (9) sprays foam onto the impeller (22). In step d above, tap water is conveyed to the spray box (8) and the spray head (9) through the distribution pipe (4). The spray box (8) sprays tap water to rinse the inner side wall of the flue shell (1), and the spray head (9) sprays tap water to rinse the impeller (22).

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