Cleaning system based on micro-nano bubble water, cleaning module and range hood

Abstract

The invention relates to the field of range hood cleaning, in particular to a cleaning system based on micro-nano bubble water, a cleaning module and a range hood. The cleaning system comprises a water tank, and a heating component used for heating water is arranged in the water tank. The bubble water generating device is used for mixing water with gas and generating micro-nano bubble water; the water inlet end of the water pump is connected with the water tank, and the water outlet end of the water pump is connected with a water inlet of the bubble water generating device; and the spraying part is connected with a water outlet of the bubble water generating device and used for guiding the generated micro-nano bubble water out to an external part to be cleaned. The problems that in an existing automatic cleaning technology, only surface oil dirt can be removed, and highly-polymerized deep oil dirt cannot be effectively cleaned are solved.

Description

Technical Field

[0001] This application relates to the field of range hood cleaning, and more particularly to a cleaning system, cleaning module, and range hood based on micro-nano bubble water. Background Technology

[0002] Stubborn grease buildup on the impeller of a range hood after long-term use is difficult to remove. Current mainstream automatic cleaning technologies, such as water-based cleaning that relies on high-temperature steam or hot water, can soften surface grease, but their short action time and weak penetration make them insufficient to completely break down deeply polymerized, aged grease. Electric dry cleaning technology, which heats the impeller to approximately 70°C to melt the grease, can only remove surface grease because the temperature is far below the actual melting point of stubborn grease, failing to achieve deep cleaning.

[0003] Therefore, developing an automated cleaning solution that can achieve deep and efficient cleaning has become an urgent technical problem to be solved in this field. Summary of the Invention

[0004] The purpose of this application is to provide a cleaning system based on micro-nano bubble water to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: Firstly, a cleaning system based on micro / nano bubble water includes: A water tank, wherein the water tank is equipped with a heating element for heating water; A bubble water generator is used to mix water and gas to produce micro-nano bubble water. A water pump, the water inlet of which is connected to the water tank, and the water outlet of which is connected to the water inlet of the bubble water generator; The spray component is connected to the outlet of the bubble water generator and is used to export the generated micro-nano bubble water to the external component to be cleaned.

[0006] Furthermore, the heating element is a ceramic heating element.

[0007] Furthermore, the ceramic heating element is configured to heat water and maintain a constant temperature within a range of 50°C to 70°C.

[0008] Furthermore, the bubble water generating device includes a venturi tube structure.

[0009] Furthermore, the bubble water generating device also includes at least one rotary cutting baffle disposed in the rear section of the venturi tube structure.

[0010] Furthermore, the number of the rotary cutting baffles is at least two, and the at least two rotary cutting baffles are connected in series along the water flow direction.

[0011] Furthermore, the ratio of the diameter of the throat of the venturi tube to the diameter of its front section is 2:5.

[0012] Furthermore, the spraying component is a spray pipe with multiple spray holes, the diameter of which is 1.5mm to 3.0mm, and the multiple spray holes are evenly distributed along the length of the spray pipe.

[0013] Secondly, this application provides a cleaning module for micro / nano bubble water, comprising: The housing, and the aforementioned cleaning system based on micro-nano bubble water integrated within the housing.

[0014] Thirdly, this application provides a range hood, including an impeller and the aforementioned micro-nano bubble water cleaning module, wherein the spray component of the micro-nano bubble water cleaning module is arranged facing the impeller.

[0015] The technical solutions provided in this application have the following advantages compared with the prior art: The cleaning system based on micro / nano bubble water provided in this application first heats the water, then uses a bubble water generator to fully mix the gas with the hot water to produce a cleaning liquid rich in micro / nano bubbles. These micro / nano bubbles have a very large specific surface area and are positively charged, enabling them to effectively adsorb and deeply penetrate into the grease. More importantly, when the micro / nano bubbles are sprayed onto the surface of the dirt, they collapse, instantly generating local high pressure and high-speed micro-jet, exerting a strong physical impact on the grease layer, thereby tearing and breaking down those deep-polymerized stubborn dirt that is difficult to remove.

[0016] This technical solution effectively addresses the shortcomings of existing automatic cleaning technologies, such as water-based washing with hot water which has a short processing time and weak penetration, and electric dry cleaning where the temperature is far below the actual melting point of stubborn grease. Both methods can only remove surface grease and cannot effectively clean highly polymerized, deep-seated grease. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1 This is a schematic diagram of the structure of the air duct system provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the smoke collection chamber provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the cleaning system provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the water tank provided in an embodiment of this application; Figure 5 This is a cross-sectional structural schematic diagram of the bubble water generator provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the rotary cutting baffle provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of the spray component provided in the embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 1. Air duct system; 11. Chassis assembly; 12. Fan assembly; 121. Impeller; 122. Volute; 123. Oil guide groove; 2. Smoke collection chamber; 22. Smoke collection chamber shell; 23. Push rod motor; 24. Oil cup; 25. Oil screen; 3. Cleaning system; 31. Water tank; 311. Water tank inlet; 312. Water tank outlet; 32. Ceramic heating element; 33. Water pump; 34. Aerated water generator; 341. Inlet; 342. Outlet; 343. Front section; 344. Contraction section; 345. Throat; 346. Diffusion section; 347. Rear section; 348. Rotary cutting baffle; 3481. Blade; 35. First hose; 36. Second hose; 37. Third hose; 38. Spray component; 381. Fixing bracket; 382. Spray nozzle; 39. Thermocouple. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0024] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0025] In order to solve the technical problem that stubborn grease on the impeller 121 of a range hood is difficult to clean thoroughly by traditional water washing or electric dry cleaning, this application provides a cleaning system 3 based on micro-nano bubble water (hereinafter referred to as the system), which can effectively penetrate, peel off and break down the deep-polymerized grease on external cleaning components (such as the impeller 121 in a range hood), achieving a deep and efficient automatic cleaning effect.

[0026] like Figures 1 to 7 As shown, a cleaning system 3 based on micro-nano bubble water includes: a water tank 31, which is equipped with a heating component for heating water; a bubble water generator 34 for mixing water and gas to generate micro-nano bubble water; a water pump 33, whose inlet end is connected to the water tank 31 and whose outlet end is connected to the inlet 341 of the bubble water generator 34; and a spray component 38, which is connected to the outlet 342 of the bubble water generator 34 for exporting the generated micro-nano bubble water to the external parts to be cleaned.

[0027] In detail, the heating element is a ceramic heating element 32. The bubble water generator 34 includes a venturi tube structure.

[0028] During operation, the heating element is activated first to heat and maintain the water in the water tank 31 at a preset temperature range, creating a basic clean thermal environment. The water pump 33 pumps warm water into the bubble water generator 34 at a specific pressure (e.g., 0.3-0.8 MPa). When the warm water enters the bubble water generator 34, it generates micro-nano bubble water, which is then uniformly sprayed onto the surface of the impeller 121 at a specific angle by the spraying element 38. The micro-nano bubbles penetrate into the micropores and interlayer structure of the grease with the water flow. During continuous spraying, the micro-nano bubbles are continuously generated, migrated, and collapsed inside the grease. The physical impact of the micro-jet destroys the grease structure, and the hydroxyl radicals generated when the micro-nano bubbles collapse oxidize and decompose the grease molecular chains, thus achieving the layer-by-layer peeling of stubborn grease.

[0029] It should be understood that this system first controls the water temperature within the range of 50-70℃ through a heating element (i.e., ceramic heating element 32). Although this temperature cannot directly melt stubborn grease, it is sufficient to significantly reduce the viscosity of the grease, creating favorable conditions for subsequent cleaning. Secondly, the heated water is pressurized and transported to the bubble water generator 34 by a water pump 33. Specifically, the bubble water generator 34 includes a venturi tube structure and a rotary cutting baffle 348 disposed in the venturi tube structure. In detail, the device uses structures such as Venturi tubes to generate negative pressure to draw in air. Under the shearing action of high-speed water flow formed by the rotary shearing baffle 348, the air is pulverized into bubbles with diameters ranging from tens of nanometers to tens of micrometers, forming micro-nano bubble water. The huge specific surface area of ​​these micro-nano bubbles provides abundant interfacial reaction sites. The positive charge on the surface can effectively adsorb negatively charged oil particles. More importantly, when the micro-nano bubbles collapse on the surface or in the crevices of the oil stains, they generate instantaneous local high pressure (about 1000 atmospheres) and strong micro-jet impact, while generating hydroxyl free radicals with strong oxidizing properties. This accelerates the disintegration of stubborn oil stains and effectively removes deep polymerized oil stains that cannot be treated by traditional methods.

[0030] In a specific embodiment, such as Figure 4 As shown, the water tank 31 of this cleaning system 3 has a volume of 300–800 mL, and the heating element is configured as a ceramic heating element 32. To ensure safety, the ceramic heating element 32 is powered by a low voltage of 12V or 24V, and the power range is set to 30–80W, which can heat the water in the water tank 31 and keep it at a stable temperature of 50–70℃.

[0031] Furthermore, the ceramic heating element 32 used in this embodiment is preferably a positive temperature coefficient (PTC) ceramic heating element 32 with self-limiting temperature characteristics. The ceramic heating element 32 is made of PTC material as the core. Taking advantage of the characteristic that the resistance value of PTC material increases sharply with the increase of temperature, when the water temperature rises to the preset range of 50-70°C, its resistance will rise rapidly, thereby automatically limiting the input power. Precise constant temperature heating effect can be achieved without the need for additional temperature control elements.

[0032] In actual operation, after the PTC ceramic heating element 32 is powered on, it can quickly raise the water temperature in the water tank 31 to 65°C, and then automatically switch to constant temperature maintenance mode to keep the water temperature stable in the range of 50-70°C, providing a continuous and stable heat source for the subsequent preparation and cleaning of micro-nano bubble water.

[0033] Therefore, by utilizing the constant temperature characteristic of the ceramic heating element 32 preset at 50–70℃, on the one hand, this temperature range is the optimal temperature window for softening grease, which can effectively improve the penetration and disintegration efficiency of micro-nano bubble water on grease, avoiding the problem of reduced cleaning power due to insufficient temperature; on the other hand, compared with traditional metal heating tubes, the ceramic heating element 32 can fundamentally avoid the severe scale formation caused by water temperature exceeding 80℃, significantly extending the overall service life of the cleaning system 3, while reducing the risk of pipe blockage; in addition, the ceramic heating element 32 material also has safety characteristics, and even under dry burning or other abnormal operating conditions, there will be no unlimited temperature rise, eliminating fire hazards from the source and further improving the safety of the cleaning system 3.

[0034] In one specific embodiment, the bubble water generator 34 includes a venturi tube structure made of polymer material or cast aluminum, which is divided into two mutually coupled parts by an axis.

[0035] Detailed, such as Figure 5 As shown, the Venturi tube structure includes a front section 343, a constriction section 344, a throat 345, a diffuser section 346, and a rear section 347 connected in sequence.

[0036] The diameter of the front section 343 is preferably 22-27mm, and the length is preferably 50-100mm. One end of the front section 343 is provided with an inlet 341, and the other end is connected to a constriction section 344. The front section 343 is used to smoothly introduce water flow and create a stable flow field for subsequent acceleration.

[0037] The contraction angle of the contraction section 344 is preferably 18-25°, which accelerates the water flow through a smoothly narrowing channel, avoids the generation of eddies, and ensures efficient energy conversion.

[0038] The diameter of the throat 345 is preferably 8-12 mm, and the length of the throat 345 is preferably 15-25 mm. Preferably, the ratio of the diameter of the throat 345 to the diameter of the front section 343 is strictly controlled at 2:5 (i.e., 10:25). This specific ratio has been verified by fluid dynamics simulation and experiments, and can generate an optimal negative pressure value (about -0.08 MPa) in the throat 345 under the pressure of the water pump 33 (e.g., 0.5-0.8 MPa), thereby achieving the optimal balance between air intake and water flow shear force. This is the core design for efficiently generating high-concentration, small-sized micro-nano bubbles.

[0039] The divergence angle of the diffuser section 346 is between 8 and 12°, which is used to gradually restore water pressure, reduce flow velocity, and promote the initial mixing and stabilization of bubbles. The downstream section of the diffuser section 346 is connected to the downstream section 347, which is equipped with an outlet 342. The spray component 38 is connected to the outlet 342 through a third hose 37.

[0040] It should be understood that, through the aforementioned precisely designed Venturi tube structure, utilizing Bernoulli's principle, when pressurized water flows through the contraction section 344 and reaches the narrow throat 345, the flow velocity increases sharply, and the static pressure drops below atmospheric pressure, thereby automatically drawing in air through the vents located on the sidewall of the throat 345. The gas-liquid two-phase flow undergoes intense shearing, mixing, and pressure changes in the throat 345 and the diffuser section 346, resulting in the gas being broken down into micro- and nano-sized bubbles. The 2:5 diameter ratio design is crucial to this embodiment. It ensures that, under limited system pressure and flow rate, a sufficiently strong negative pressure can be generated to draw in a sufficient amount of air, while maintaining sufficient shear force to break up the bubbles, avoiding the problems of insufficient air intake due to an excessively large ratio or weakened shear force due to an excessively small ratio.

[0041] For example, when water pump 33 pumps warm water into the front section 343 of the venturi tube at a pressure of 0.65 MPa, the water flow accelerates through the contraction section 344, reaching a peak velocity of approximately 25 m / s at the throat 345 and forming a strong negative pressure zone. The inhaled air is immediately sheared by the high-speed water flow. The initially mixed gas-liquid flow undergoes a process of velocity reduction and pressure recovery in the diffusion section 346 and the rear section 347, which further compresses and refines the bubbles, ultimately outputting a cleaning fluid rich in micro- and nano-bubbles.

[0042] Therefore, the Venturi tube structure of this technical solution can improve the generation efficiency and quality of micro and nano bubbles, and the 2:5 ratio of the inner diameter of the throat 345 to the inner diameter of the front section 343 serves as a key performance inflection point, enabling the system to achieve the best bubble generation effect without significantly increasing the power of the water pump 33, thereby achieving an optimized balance of energy efficiency.

[0043] Furthermore, in a preferred embodiment, to improve the uniformity and refinement of the micro / nano bubbles, such as... Figure 5 and Figure 6As shown, the sparkling water generator 34 also includes at least one rotary cutting baffle 348 disposed in the rear section 347 of the venturi tube structure. Specifically, the rotary cutting baffle 348 is a one-piece structure, preferably manufactured by injection molding. The number of rotary cutting baffles 348 is at least two, such as three, four, or five, and the specific number is adjusted according to actual usage needs. Each rotary cutting baffle 348 has six to ten blades 3481, the ratio of the baffle's diameter to its height is preferably 3:1, and the tilt angle of the blades 3481 is preferably 20-40°.

[0044] It should be understood that after the initial gas-liquid mixture is generated at the throat 345 of the aforementioned Venturi tube, the gas-liquid two-phase flow impacts the rotary shearing baffle 348 at a high speed. The rotary shearing baffle 348 plays a role in forced rotary shearing and secondary crushing. Most of the fluid is forced to pass through the spiral guide groove between adjacent blades 3481, generating a strong rotating shear flow. The centrifugal shearing force further breaks down and refines the bubbles generated at the throat 345. In addition, the rotary shearing baffle 348 also plays a role in turbulence enhancement and mixing. Since the spiral guide groove disrupts the laminar flow state of the fluid, a controllable high-intensity turbulence zone is formed behind the baffle, which greatly improves the mixing efficiency and contact time of the gas-liquid two phases and promotes the uniform dispersion of bubbles.

[0045] In use, when the gas-liquid mixture impacts the rotary cutting baffle 348, the main body maintains axial forward momentum through the central through-hole of the baffle, while a considerable portion of the fluid is guided by the spiral guide groove to form a high-speed swirling flow. The flow field after passing through the baffle transforms into a composite state of axial and rotational flow. Under intense turbulent shearing, the bubbles undergo a "break-mix-re-break" cycle, and then enter the third hose 37 from the outlet 342 with the fluid, and enter the spray component 38 under the guidance of the third hose 37. Therefore, this embodiment, through the rotary cutting baffle 348 set in the rear section 347, can output finer and richer micro-nano bubbles. The finer and more uniformly cut bubbles have a larger specific surface area, and the micro-jet generated when they collapse is more concentrated, which can effectively improve the cleaning efficiency of stubborn oil stains.

[0046] In another embodiment, when the number of rotary shearing baffles 348 is at least two, and at least two rotary shearing baffles 348 are connected in series along the water flow direction, the shearing and mixing effect on the gas-liquid mixed flow is enhanced.

[0047] Specifically, multiple rotary cutting baffles 348 are arranged and fixed in the inner cavity of the rear section 347 of the venturi tube in an axial direction at equal intervals (e.g., 20-30 mm), and the spiral direction of the guide grooves of all rotary cutting baffles 348 is consistent.

[0048] In operation, the initial gas-liquid mixture from the throat 345 of the venturi tube passes sequentially through multiple vortex shearing baffles 348 connected in series along the water flow direction. Each time the fluid passes through a vortex shearing baffle 348, it is forcibly divided into multiple spiraling streams, generating strong vortices. The rotating turbulent flow, already containing finer bubbles, exiting from the previous vortex shearing baffle 348 directly serves as the input fluid for the next vortex shearing baffle 348, undergoing the same or even stronger shearing action again. This process is repeated until the fluid exits the last vortex shearing baffle 348. The final output micro / nano bubble water undergoes multiple high-intensity homogenization processes, resulting in significant optimization of bubble size and distribution.

[0049] It should be noted that each time the gas-liquid mixture passes through a rotary shearing baffle 348, it undergoes intense rotational shearing and turbulent mixing. The series design allows this shearing action to be applied repeatedly, essentially performing multiple "break-up processes" on the bubbles. That is, the bubbles broken by the first rotary shearing baffle 348 are further refined in the second baffle. On the other hand, the series layout allows the fluid to quickly enter the strong shearing zone of the next baffle after leaving the turbulent zone of the previous baffle. The bubbles are in a state of intense disturbance throughout the entire transport process, which greatly suppresses bubble collisions and merging caused by Brownian motion or velocity differences, ensuring the stability of bubble size. At the same time, the series design extends the effective processing path: although the physical length of a single baffle is relatively short, the series connection of multiple baffles spatially extends the total path through which the fluid undergoes high-intensity shearing. The bubbles have more time to be repeatedly stretched and torn in turbulence, thus achieving more thorough break-up and more uniform dispersion. Finally, these micro- and nano-bubbles enter the spray component 38 through the outlet 342 of the Venturi tube structure.

[0050] Detailed, such as Figure 7 As shown, the spraying component 38 is a spraying pipe with multiple spray holes 382. The spraying pipe is preferably a stainless steel pipe. The diameter of the spray holes 382 is 1.5 mm to 3.0 mm, and the multiple spray holes 382 are evenly distributed along the length of the spraying pipe.

[0051] In an embodiment with four spray holes, a cleaning solution rich in micro / nanobubbles is output from a bubble water generator 34 and enters the spray pipe. Under pressure (e.g., 0.6 MPa) provided by a water pump 33, the cleaning solution is ejected at high speed from each of the 2.0 mm diameter spray holes 382, ​​forming four jets of liquid. These jets impact the blades 3481 of the impeller 121, which are either rotating at low speed (in cleaning mode) or stationary, at a specific angle. After impact, some of the liquid jets are reflected and splashed, while others spread along the surface of the blades 3481 to form a liquid film. The micro / nanobubbles carried in the liquid film then penetrate into the interior of the grease layer. The uniformly distributed spray holes 382 ensure that the entire curved surface of the impeller 121, from one end to the other, is effectively covered by the liquid film, providing a uniform medium for the subsequent penetration and collapse of the micro / nanobubbles. Meanwhile, the uniform and directional spray holes reduce the situation where the cleaning liquid is directly thrown out or ineffectively spilled, so that most of the cleaning liquid can act on the surface of the impeller 121. While ensuring the cleaning effect, it helps to reduce the volume of the water tank 31 and the overall water consumption.

[0052] In summary, this technical solution's micro-nano bubble water-based cleaning system first provides an ideal thermal environment for the cleaning process through a controlled heating component (ceramic heating element 32). Then, a bubble water generator 34, combining a venturi tube structure and a rotary cutting baffle 348, efficiently generates an active cleaning fluid rich in micro-nano bubbles. Finally, a spray component 38 with uniformly arranged spray holes 382 precisely covers the surface of the part to be cleaned. Through the synergistic effect of each component, the system penetrates deep into the grease and grime, breaking down its polymer structure, effectively overcoming the limitations of traditional surface cleaning in existing technologies. Furthermore, thanks to the temperature control of the ceramic heating element 32 and the optimized design of the venturi tube structure, efficient cleaning can be achieved even under low-load conditions, resulting in lower energy consumption.

[0053] Furthermore, based on the above structural design and collaborative working mechanism, this cleaning system based on micro-nano bubble water can not only be deployed independently to complete cleaning operations, but can also be further packaged into standardized cleaning modules based on the integrated and modular design concept.

[0054] For example, and also Figures 1 to 7 As shown, a micro-nano bubble water cleaning module (hereinafter referred to as the module) includes: a housing, and the aforementioned micro-nano bubble water-based cleaning system 3 integrated within the housing.

[0055] Specifically, a flat water tank 31 with a volume of 300-800mL (e.g., 500mL) is fixed at the bottom of the casing. The top of the water tank 31 has a water inlet with a sealed cap. Inside, a PTC ceramic heating element 32 powered by a 12V or 24V safe voltage and with a power of 30-80W is installed, along with a thermocouple 39 for overheat protection. The PTC ceramic heating element 32 utilizes its self-limiting temperature characteristic to heat the water in the water tank 31 and maintain a stable temperature within a set range of 50-70℃. Adjacent to the water tank 31, a pressure device with a working pressure of 0.3-0.8MPa (which can be set to 0.3MPa) is installed. A high-pressure water pump 33 (0.65 MPa) has its inlet sealed to the outlet 312 of a water tank via a first hose 35. The outlet 312 is connected to the inlet 341 of a bubble water generator 34 via a second hose 36. The bubble water generator 34 includes a Venturi tube structure made of polymer material or cast aluminum. The Venturi tube is divided into two coupled parts along its axis for ease of production and maintenance. Its specific structure is as follows: the front section 343 has a diameter of 22-27 mm and a length of 50-100 mm; the contraction section 344 has a contraction angle of 18-25°; and the throat 345 has a diameter of 8-12 mm and a length of... The diameter of the throat 345 is 15-25mm, and the diameter of the front section 343 meets the critical ratio of 2:5. The divergence angle of the diffuser section 346 is 8-12°. The diameter of the rear section 347 is the same as that of the front section 343, but slightly longer. Simultaneously, inside the rear section 347 of the venturi tube, 3-5 (specifically 3) rotary cutting baffles 348 are connected in series along the water flow direction. Each rotary cutting baffle 348 is manufactured using injection molding, with a diameter-to-height ratio preferably of 3:1. It has 6-10 (specifically 8) blades 3481 with an inclination angle of 20-40° (specifically 30°). The control of this cleaning module... The control unit is an integrated MCU control board, which is responsible for receiving external instructions and coordinating the timing of PTC heating and water pump 33 operation. The generated micro-nano bubble water enters the stainless steel spray pipe through the outlet 342 on the bubble generator. The spray pipe is installed inside the housing by a fixed bracket 381. It has 4-8 (specifically set to 6) spray holes 382 with a diameter of 1.5-3.0mm (specifically set to 2.0mm). The spray holes are evenly distributed along the length of the spray pipe at a spacing of 15-30mm (specifically set to 20mm) to direct the cleaning liquid outward and clean the external parts.

[0056] Upon receiving the cleaning command, the PTC ceramic heating element 32 in the module is activated first, heating the water in the water tank 31 and maintaining it at a constant temperature of 50-70℃. Subsequently, the high-pressure water pump 33 is activated, pumping the constant-temperature hot water through the pipeline into the Venturi tube structure at a pressure of 0.3-0.8MPa. The water flow is accelerated in the contraction section 344, and negative pressure is generated at the throat 345 to draw in air, forming a preliminary gas-liquid mixture. Then, it flows through multiple series of rotary shearing baffles 348. Under the strong rotational shearing caused by the baffle blades 3481, the bubbles are broken and refined in multiple stages, ultimately generating high-concentration micro-nano bubble water. It is then sprayed onto the surface of the impeller 121 at a specific angle and pressure through the evenly distributed spray holes 382 on the spray pipe, completing the cleaning operation. The wastewater is then recovered to the oil cup 24 through the bottom guide structure of the volute 122 under the action of gravity.

[0057] The micro-nano bubble water cleaning module using this technical solution significantly improves the product's versatility, ease of installation, and maintenance efficiency, making it suitable not only for household range hoods but also for seamless integration into commercial kitchen fume purification equipment (such as central exhaust systems in large hotels), industrial equipment (such as online cleaning devices for fans, heat exchangers, and molds), and even thermal management systems or air conditioning cleaning scenarios in the automotive field.

[0058] In addition, it facilitates large-scale production and effectively reduces costs. For example, on the production side, OEMs do not need to install scattered cleaning components one by one on the assembly line; they only need to embed pre-tested cleaning modules, improving production line efficiency. On the after-sales side, when the system malfunctions or requires regular replacement of consumables (such as scale buildup in water tank 31 or aging of water pump 33), users or maintenance personnel do not need to disassemble the entire machine, disconnect multiple pipelines, or rewire. They only need to pull out the entire cleaning module, replace it, or return it to the factory for repair and reinstall it to restore functionality, greatly simplifying the maintenance process and reducing labor costs and downtime.

[0059] Furthermore, a range hood, and also... Figures 1 to 7 As shown, the system includes an impeller 121 and the aforementioned micro-nano bubble water cleaning module, with the spray component 38 of the micro-nano bubble water cleaning module facing the impeller 121.

[0060] Specifically, the main structure of the range hood consists of a duct system 1 and a smoke collection chamber 2. The duct system 1 is the core power and channel component for the range hood to achieve its smoke extraction function, and mainly comprises three parts: first, the casing assembly 11, which serves as the main structural frame of the entire range hood, providing installation support and protection for other components; second, the fan assembly 12, which is the power core of the duct system 1, integrating an impeller 121 for driving airflow to achieve smoke extraction, a volute 122 for guiding airflow direction, and an oil guide trough 123 for collecting condensed oil in the airflow; and third, the oil cup 24, which receives and collects the oil flowing from the duct system 1 and the subsequent smoke collection chamber 2, achieving centralized oil treatment.

[0061] The smoke collection chamber 2 is used to efficiently capture and gather rising fumes during cooking. It includes: a smoke collection chamber shell 22, which serves as the basic structure of the smoke collection chamber 2 and forms the cavity space for gathering fumes; a flip-up glass panel, located on the front of the smoke collection chamber 2, which has an openable and closable design. When closed, it keeps the appearance of the range hood clean, and when open, it increases the air intake area for fumes; an oil filter 25, which is installed on the air intake path of the smoke collection chamber 2, and is used to perform preliminary filtration of the inhaled fumes and intercept large oil droplets; at the same time, a push rod motor 23 is configured as the driving component of the flip-up glass panel, which is used to precisely control the opening and closing action of the flip-up glass panel to adapt to the fume treatment needs of different cooking scenarios.

[0062] When the micro-nano bubble water cleaning module is integrated into the range hood, the housing of the cleaning module is adapted to be set inside the top surface of the smoke collection chamber 2 housing and reliably fixed by screw assembly; the spray component 38 (spray pipe) of the module is assembled inside the volute 122 by its own fixed bracket 381, and the multiple spray holes 382 on the spray pipe are all precisely facing the inner surface of the impeller 121 to ensure that the cleaning liquid can fully cover the area to be cleaned. Meanwhile, a through hole is made at the position of the water inlet 311 of the module water tank on the housing of the smoke collection chamber 2. The operator can directly add water to the module water tank 31 from the outside of the range hood through this through hole without disassembling the machine. In addition, the cleaning module is electrically connected to the main control board of the range hood through a dedicated wiring harness and standardized connectors, so as to receive the cleaning instructions issued by the main control board and obtain the power required for operation. In particular, this cleaning module does not have an additional wastewater recovery structure. The oily wastewater after cleaning flows naturally along the inner wall of the volute 122 to the oil guide groove 123 under the action of gravity, and finally flows into the original oil cup 24 of the range hood, realizing the centralized collection and treatment of oil.

[0063] During use, the user can manually start the automatic cleaning program via the control panel, or the cleaning command can be automatically triggered by the range hood's intelligent program. After receiving the command, the main control board first drives the push rod motor 23 to close the flap glass to seal the working chamber of the smoke collection chamber 2. Then the cleaning module enters the working state, and the internal PTC ceramic heating element 32 starts to heat 300-800mL of water in the water tank 31 and keep it at a constant temperature of 50-70℃, the optimal temperature range for softening grease. After the water temperature reaches the standard, the high-pressure water pump 33 starts, pumping the constant temperature hot water 33 into the bubble water generator composed of a venturi tube and a series of rotary shearing baffles 348 at a pressure of 0.3-0.8MPa. The water flow creates a negative pressure at the throat 345 of the venturi tube structure, drawing in air. After being sheared by the rotary shearing baffles, a cleaning liquid rich in highly active micro-nano bubbles is generated.

[0064] The generated micro-nano bubble water is directionally sprayed onto the inner surface of the impeller 121 and the volute 122 through the spray nozzles 382 on the spray pipe. During this process, the range hood's fan drives the impeller 121 to rotate at a low speed, ensuring that the cleaning liquid evenly covers the surface of the impeller 121. The micro-nano bubbles, with their extremely small particle size, penetrate deep into the grease and then collapse, instantly generating local high-pressure micro-jet streams and free radicals, achieving a dual cleaning effect of physical peeling and chemical decomposition on long-accumulated, deeply polymerized, stubborn grease. The cleaned oily wastewater flows into the oil guide groove 123 along the inner wall of the volute 122 under the action of gravity, and finally collects in the oil cup 24 for centralized collection. In addition, after the cleaning process is completed, the range hood's fan can switch to high-speed operation mode and continue for a period of time to dry the residual moisture inside the impeller 121 and the volute 122, thus completing the automatic cleaning process.

[0065] In summary, the range hood using the micro-nano bubble water cleaning system or micro-nano bubble water cleaning module of this technical solution achieves deep, efficient and automatic cleaning of the entire machine. By integrating the micro-nano bubble water cleaning system 3 with the traditional range hood structure, the range hood has the ability to be "cleaned without disassembly" and can effectively remove stubborn grease from the impeller 121 and the volute 122.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0069] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0072] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0073] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cleaning system based on micro / nano bubble water, characterized in that, include: A water tank, wherein the water tank is equipped with a heating element for heating water; A bubble water generator is used to mix water and gas to produce micro-nano bubble water. A water pump, the water inlet of which is connected to the water tank, and the water outlet of which is connected to the water inlet of the bubble water generator; The spray component is connected to the outlet of the bubble water generator and is used to export the generated micro-nano bubble water to the external component to be cleaned.

2. The cleaning system based on micro / nano bubble water according to claim 1, characterized in that, The heating element is a ceramic heating element.

3. The cleaning system based on micro / nano bubble water according to claim 2, characterized in that, The ceramic heating element is configured to heat water and maintain a constant temperature within the range of 50°C to 70°C.

4. The cleaning system based on micro / nano bubble water according to claim 1, characterized in that, The bubble water generator includes a venturi tube structure.

5. The cleaning system based on micro / nano bubble water according to claim 4, characterized in that, The bubble water generator also includes at least one rotary cutting baffle disposed in the rear section of the venturi tube structure.

6. The cleaning system based on micro / nano bubble water according to claim 5, characterized in that, The number of the rotary cutting baffles is at least two, and at least two of the rotary cutting baffles are connected in series along the water flow direction.

7. The cleaning system based on micro / nano bubble water according to claim 4, characterized in that, The ratio of the diameter of the throat of the Venturi tube to the diameter of its front section is 2:

5.

8. The cleaning system based on micro / nano bubble water according to claim 1, characterized in that, The spraying component is a spray pipe with multiple spray holes, the diameter of which is 1.5mm to 3.0mm, and the multiple spray holes are evenly distributed along the length of the spray pipe.

9. A cleaning module for micro / nano bubble water, characterized in that, include: A housing, and a cleaning system based on micro-nano bubble water as described in any one of claims 1-8 integrated within the housing.

10. A range hood, characterized in that, It includes an impeller and a micro / nano bubble water cleaning module as described in claim 9, wherein the spray component of the micro / nano bubble water cleaning module is arranged toward the impeller.

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