Cleaning equipment and control method thereof

Abstract

According to the cleaning equipment and the control method thereof, a straight pipe or a common spray pipe on a water inlet pipeline of traditional cleaning equipment is replaced with a Laval spray pipe, and high-energy cavitation water flow generated by the Laval spray pipe is rich in a large number of micron-sized cavitation bubbles. The cavitation bubbles are instantly collapsed when impacting the surface of an object to be washed (such as a shoe), and extremely high local shock waves and micro-jet are generated. The strong physical force can effectively penetrate through fiber gaps, and stubborn stains (such as oil stains and mud stains) which are difficult to treat through traditional scrubbing or common water flow are thoroughly stripped and removed. The blots are exploded by increasing the energy per unit volume of the water flow (i.e., generating a cavitation effect). Therefore, the cleaning effect far better than that of the traditional technology can be achieved under the condition that less water is used. The environment-friendly policy of energy conservation and emission reduction is actively responded, and the long-term use cost is also reduced for users.

Description

Technical Field

[0001] This invention relates to the field of intelligent cleaning equipment technology, specifically to a cleaning device and its control method. Background Technology

[0002] With the significant improvement in people's living standards and the growing popularity of healthy and clean living concepts, home appliances are rapidly developing towards refinement, specialization, and intelligence. Against this backdrop, cleaning equipment specifically designed for clothing and items has emerged. Shoe washing machines, as another emerging home appliance following washing machines and dishwashers, are gradually entering Chinese households, demonstrating enormous market potential and widespread user demand. Shoes, as essential items for daily life, come into direct contact with complex and ever-changing ground environments, easily accumulating various stains such as dust, mud, oil, and organic residue. Traditional hand-washing of shoes is not only time-consuming and laborious, but the cleaning effect also varies from person to person, making it difficult to thoroughly remove deep-seated dirt. Therefore, the emergence of shoe washing machines aims to liberate people from this tedious labor, catering to the modern fast-paced lifestyle's pursuit of convenience and efficiency. However, despite the booming market for shoe washing machines, most of their core technologies follow or are modified from the washing principles of traditional top-loading washing machines, revealing many technical bottlenecks and structural defects that urgently need to be addressed when dealing with the special cleaning object of shoes. Currently, the mainstream shoe washing machines on the market mainly employ the following technological approaches, all of which have significant limitations: 1. Mechanical brushing technology and its inherent drawbacks: This is the most traditional and widely used technical solution. Its working principle involves installing rotating brushes (usually made of nylon or soft rubber) inside the washing chamber. Driven by a motor, the brushes rotate at high speed, creating direct and intense physical friction with the shoe surface, thereby scraping away stains. The disadvantages of this technology are: Shoes have complex designs with numerous irregular curves, seams, lace holes, and areas where different materials are combined (such as leather, canvas, mesh, and reflective strips). A fixed rotating brush cannot fully conform to these complex curves, resulting in cleaning blind spots and poor removal of stains from recessed areas of the upper and under the laces. More seriously, the overly stiff bristles, under high-speed rotation, may cause irreversible scratches, pilling, or wear to certain delicate materials (such as suede, patent leather, and woven fabrics), severely affecting the shoe's appearance and lifespan.

[0003] During the washing process, the brush bristles will accumulate a large amount of dirt detached from the shoes. If they are not cleaned promptly and thoroughly, this residual dirt will become a breeding ground for bacteria and mold, causing cross-contamination of the shoes during subsequent washing processes, which runs counter to the original intention of healthy cleaning.

[0004] Driving a high-power motor to rotate the brush head at high speed consumes a lot of electrical energy, and also generates relatively large mechanical noise and vibration, which affects the user experience.

[0005] 2. Water jet scouring technology and its insufficient power: This technology attempts to avoid damage caused by direct contact by using a pump to drive water flow, creating a jet of water that impacts the shoe upper. While this reduces the risk of physical damage to the shoe upper, it also introduces new problems.

[0006] Conventional water pumps generate limited flow rates and pressures, and the resulting jet impact is primarily effective against surface dust. Their cleaning efficiency is significantly insufficient for stubborn stains that have penetrated deep into the fibers or have hardened over time (such as oil stains, pen marks, and protein stains). Water often simply slides across the shoe surface, failing to generate sufficient shear force to break down the bond between the stain and the fibers. To achieve a certain cleaning effect, this technology typically requires a large amount of water and a long washing time, repeatedly rinsing to "grind away" the stain. This contradicts current societal advocacy for energy conservation, emission reduction, and environmental protection, and increases users' water bills.

[0007] 3. Limitations of Ultrasonic Cleaning Technology and its Applications: Ultrasonic cleaning technology is mature in the field of industrial precision cleaning. Its principle is based on the "cavitation effect" generated by high-frequency vibration in a liquid. The high-pressure shock waves generated when tiny cavitation bubbles collapse can act on the surface of an object, achieving thorough cleaning without dead angles. A few high-end shoe washing machines have attempted to incorporate this technology. The disadvantages of this technology are: The high cost of ultrasonic generators and transducers capable of producing effective cleaning power results in expensive overall machines, hindering their widespread adoption in the consumer market. In a home environment, insufficient ultrasonic power leads to ineffective cleaning, no different from ordinary water flow; excessive power may potentially affect the internal structure of the shoe's adhesives and cushioning materials (such as EVA and Air cushioning), posing a risk of delamination or material fatigue. Furthermore, it places specific requirements on the structure of the washing chamber to ensure a uniform sound field distribution.

[0008] In summary, the core technical challenges faced by existing shoe washing machine technologies can be summarized into the following three points: The contradiction between cleaning efficiency and thoroughness: Neither mechanical friction nor water rinsing can effectively and thoroughly remove complex shoe structures and stubborn stains without damaging the shoe surface. Stain residue is a common problem; long-term accumulation of dirt not only affects appearance, but its acidic or alkaline components can also continuously corrode the shoe surface material, accelerating aging, hardening, and fading, significantly shortening its lifespan.

[0009] The contradiction between cleaning effectiveness and resource consumption: To achieve barely acceptable cleaning results, existing technologies often sacrifice water and electricity resources. This high water and electricity consumption model increases user costs and contradicts national industrial policies promoting the development of efficient and energy-saving home appliances.

[0010] The disconnect between cleaning and sterilization: Shoes, as the carrier of the feet, are constantly in a damp and hot environment, making them highly susceptible to bacterial and fungal growth, resulting in odors. However, most existing shoe washing machines only focus on "stain removal," completely neglecting the crucial health requirement of "sterilization." The cleaning process merely removes visible dirt, potentially spreading bacteria evenly across the shoe surface, and the damp washing environment may even promote microbial growth. Cleaning and disinfection, as two separate steps, cannot be completed in a single operation, causing inconvenience to users and failing to ensure truly hygienic and clean shoes.

[0011] Therefore, the shoe washing machine industry urgently needs a completely new cleaning technology approach. This technology should break free from the traditional mindset of mechanical friction and simple rinsing, achieving powerful stain removal efficiency at the microscopic physical level, while also possessing functions such as high water efficiency, non-destructive care, and internal sterilization. It must effectively solve the problem of cleaning dead spots, handle diverse stains, and significantly reduce water and electricity consumption, ultimately achieving the comprehensive goal of "cleaner, better care, resource-saving, and healthier," thereby driving the industrial upgrade of shoe washing machines from "available" to "high-quality," and meeting consumers' expectations for a high-quality life. Summary of the Invention

[0012] In view of this, the purpose of the present invention is to provide a cleaning device and its control method to solve the problems of low cleaning efficiency and serious water waste in existing cleaning devices.

[0013] According to a first aspect of the present invention, a cleaning apparatus is provided, comprising: The housing, and the washing tub located inside the housing; The water inlet valve, located at the upper rear part of the housing, is used to connect to an external water source; A Laval nozzle, extending from the inlet valve, is used to direct water to the washing tub; A distributor or spray arm, with one end connected to the end of the Laval nozzle and the other end connected to a spray head, is used to evenly spray the high-energy cavitation water flow generated by the Laval nozzle onto the surface of the items to be washed in the washing tub.

[0014] Preferably, the Laval nozzle comprises: The contraction section has a pipe cross-sectional area that gradually decreases along the water flow direction, which is used to gradually convert the pressure energy of the high-pressure water flow into kinetic energy, so that the water flow continues to accelerate. The throat, connected to the end of the contraction section, is the part with the smallest cross-sectional area in the Laval nozzle and is the starting point for cavitation. The expansion section, connected after the throat, has a pipe cross-sectional area that gradually increases along the direction of water flow; The cross-sectional area of ​​the water outlet of the expansion section is greater than or equal to the cross-sectional area of ​​the water inlet of the contraction section.

[0015] Preferably, the cleaning equipment further includes: A UVC sterilization module is installed on the top or upper side wall of the washing tub; or... If the cleaning equipment adopts a central impeller or rotating spray arm structure, the UVC sterilization module is installed at a preset angle inside the central shaft of the central impeller or rotating spray arm, and light radiates outward through the light-transmitting window; or... The UVC sterilization module is integrated on the inner panel of the door, and when the door is closed, the UVC sterilization module faces the washing tub.

[0016] Preferably, the water inlet valve is an electric water inlet valve, and the cleaning equipment further includes: A high-pressure water pump, located after the inlet valve and before the Laval nozzle, is used to provide sufficiently high pressure for the water flow; The controller is connected to the inlet valve, the high-pressure water pump, and the UVC sterilization module.

[0017] Preferably, the cleaning equipment includes a shoe washing machine.

[0018] According to a second aspect of the present invention, a control method for a cleaning device is provided, comprising: During the main wash phase, the high-pressure water pump is activated to pressurize the water and deliver it to the Laval nozzle. This causes the water flow to accelerate as it passes through the constriction section of the Laval nozzle, where the pressure drops to its minimum. A large number of cavitation bubbles are generated here, and the high-speed water flow rich in cavitation bubbles is ejected from the expansion section of the Laval nozzle, directly impacting the surface of the item to be washed, achieving deep cleaning.

[0019] Preferably, the control method further includes: While cavitation washing is in progress, the UVC sterilization module is activated to emit short-wave ultraviolet light to irradiate the surface of the items to be washed.

[0020] Preferably, the step of activating the UVC sterilization module to emit short-wave ultraviolet light to irradiate the surface of the items to be washed during cavitation washing includes: Start the high-pressure water pump to establish basic water pressure; Close the bypass valve and open the Laval nozzle; Adjust the frequency of the high-pressure water pump so that the flow velocity at the throat of the Laval nozzle reaches the critical value; The UVC sterilization module is activated, and cavitation cleaning continues for a first duration, followed by an intermittent second duration, alternating and cycling N times, with the second duration being shorter than the first duration. The intensity of cavitation noise is monitored by a high-frequency acoustic sensor. If the intensity of cavitation noise is insufficient, the speed of the high-pressure water pump is increased; if the intensity of cavitation noise is too high, the speed of the high-pressure water pump is decreased. After cavitation washing is completed, turn off the UVC sterilization module.

[0021] Preferably, prior to the main washing stage, the process further includes: User initialization: After detecting that the user has put the shoes to be cleaned into the washing chamber and closing the chamber door, the system receives the washing mode selected by the user on the control panel. System self-check: Checks whether the door is securely locked to prevent water or UV leakage during washing; checks whether the water level sensor is functioning properly; checks whether the UVC sterilization module's protection mechanism is ready to ensure that the UVC sterilization module cannot be activated when the door is open, thus protecting user safety.

[0022] Preferably, between the system self-test and the main wash stage, the following is further included: Pre-wash stage: The control system injects room temperature water, does not activate the high-pressure mode of the Laval nozzle, and uses normal water flow mode to spray or soak the items to be cleaned for a time shorter than preset.

[0023] Preferably, after the main washing stage, the process further includes: Rinsing stage: Open the bypass valve, close the Laval nozzle, control the system to inject clean water, use normal water flow for three hours, drain, then inject clean water again, alternate the cycle N times to thoroughly rinse away detergent residue and suspended dirt. Dehydration stage: High-speed rotation dehydration continues for the fourth preset duration, followed by low-speed intermittent rotation to promote ventilation.

[0024] Preferably, the control method further includes: After the system stops all operations, it shuts off the high-pressure water pump, unlocks the door, notifies the user that cleaning is complete, and displays a cleanliness score.

[0025] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects: By replacing the straight pipes or ordinary nozzles in the water inlet of traditional cleaning equipment with Laval nozzles, the high-energy cavitation water flow generated by the Laval nozzles is rich in micron-sized cavitation bubbles. These cavitation bubbles collapse instantly upon impacting the surface of the item to be washed (such as shoes), generating extremely high localized shock waves and microjets. This powerful physical force can effectively penetrate fiber gaps, thoroughly peeling off and removing stubborn stains (such as oil and mud) that are difficult to handle with traditional brushing or ordinary water flow.

[0026] Because cleaning relies on cavitation bubbles in the water flow, it can cover the entire surface of the item to be washed without any blind spots, including the complex curves of the shoe upper, gaps, and areas under the shoelaces that a brush cannot effectively reach, achieving a leap from "rough brushing" to "fine immersion cleaning".

[0027] It "bursts" apart stains by increasing the energy per unit volume of water flow (i.e., creating a cavitation effect). Therefore, it can achieve cleaning results far exceeding those of traditional technologies with less water. This actively responds to environmental protection policies focused on energy conservation and emission reduction, and also reduces long-term operating costs for users.

[0028] Furthermore, traditional shoe washing machines rely on direct and intense friction between brush bristles and the shoe upper, which can easily cause scratches, pilling, or deformation of delicate materials (such as suede, mesh, and leather). This solution utilizes the hydrodynamic force of cavitation bubble collapse for cleaning, avoiding direct contact between hard brush bristles and the shoe upper, thus fundamentally eliminating the risk of damage caused by mechanical friction. It is particularly suitable for the maintenance cleaning of high-end footwear. By reducing or eliminating reliance on mechanical rotating brushes, the system's mechanical structure is simplified, and potential points of failure in moving parts are correspondingly reduced, contributing to improved overall equipment reliability and lifespan.

[0029] Furthermore, its core innovation lies in the improvement of the water inlet path (i.e., replacing ordinary pipes with Laval nozzles), without requiring disruptive changes to the main structure of the washing tub or the drive system. This allows existing shoe washing machine product platforms to integrate this technology at a lower cost and with a faster development cycle, greatly enhancing the commercial viability and promotional value of the technology.

[0030] In summary, the technical solution provided by this invention, by introducing the Laval nozzle as a core component, upgrades the cleaning method from passive "hydraulic flushing" and rough "mechanical friction" to active "high-energy physical blasting," thereby achieving a qualitative leap in terms of cleaning power, water conservation, care properties, and reliability, and represents an important development direction for cleaning technology.

[0031] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0033] Figure 1 This is a schematic diagram of the structure of a Laval nozzle according to an exemplary embodiment; Figure 2This is a schematic diagram illustrating the principle of cavitation cleaning using a Laval nozzle according to another exemplary embodiment; Figure 3 This is a flowchart illustrating a control method for a cleaning device according to an exemplary embodiment; Figure 4 This is a flowchart illustrating a control method for a cleaning device according to another exemplary embodiment; Figure 5 This is a flowchart illustrating a control method for a cleaning device according to another exemplary embodiment. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0035] Example 1 A cleaning apparatus according to an exemplary embodiment includes: The housing, and the washing tub located inside the housing; The water inlet valve, located at the upper rear part of the housing, is used to connect to an external water source; Laval nozzle (see) Figure 1 The water is drawn from the inlet valve and used to direct water to the washing tub; A distributor or spray arm, with one end connected to the end of the Laval nozzle and the other end connected to a spray head, is used to evenly spray the high-energy cavitation water flow generated by the Laval nozzle onto the surface of the items to be washed in the washing tub.

[0036] It should be noted that the cleaning equipment provided in this embodiment includes, but is not limited to: 1. Shoe Washing Machine: Ideal for families seeking a high-quality lifestyle, families with children, or families with sports enthusiasts. Children's shoes get dirty easily, and athletic shoes are prone to sweat stains and odors. This solution provides a deep cleaning and sterilization effect far exceeding hand washing. It saves users time and effort while offering gentle care, making it especially suitable for cleaning expensive limited-edition athletic shoes, leather shoes, canvas shoes, etc., avoiding the wear and tear caused by brushing.

[0037] 2. Fruit and Vegetable Washing Machine: Utilizing the impact force generated by the collapse of cavitation bubbles, it can effectively remove pesticide residues, wax, and dirt from the surface of fruits and vegetables without damaging the skin like a brush. It physically removes pesticide residues without chemical additives, making it especially gentle on delicate fruits and vegetables such as strawberries and grapes.

[0038] 3. Baby Product Cleaning Machine: Used for cleaning baby bottles, nipples, teething toys, and baby food utensils. The cavitation water flow's ability to reach every corner thoroughly cleans the internal threads and straws of baby bottles. Combined with the sterilization function, it ensures a high level of hygiene for baby products. No high-temperature boiling is required, avoiding the deformation or release of harmful substances from plastic products due to high temperatures, achieving efficient and low-temperature sterilization.

[0039] 4. Precision Components / Laboratory Equipment Cleaning Machine: In the industrial field, it is used to clean precision molds, optical lenses, and semiconductor components; in the laboratory, it is used to clean test tubes, flasks, pipettes, etc. The cavitation effect can remove microscopic contaminants, and it is a non-contact cleaning method, completely avoiding scratches on precision surfaces.

[0040] Understandably, the high-energy cavitation water jet generated by the Laval nozzle is rich in micron-sized cavitation bubbles. These cavitation bubbles collapse instantly upon impacting the surface of the item to be washed (such as shoes), generating extremely high local shock waves and microjets. This powerful physical force can effectively penetrate fiber gaps, thoroughly peeling off and removing stubborn stains (such as oil and mud) that are difficult to remove with traditional brushing or ordinary water flow.

[0041] Because cleaning relies on cavitation bubbles in the water flow, it can cover the entire surface of the item to be washed without any blind spots, including the complex curves of the shoe upper, gaps, and areas under the shoelaces that a brush cannot effectively reach, achieving a leap from "rough brushing" to "fine immersion cleaning".

[0042] The core advantage of the technical solution provided in this embodiment lies in the fact that it does not rely on a large flow of water to "wash away" stains, but rather "explodes" stains by increasing the energy per unit volume of the water flow (i.e., generating a cavitation effect). Therefore, it can achieve a cleaning effect far exceeding that of traditional technologies with less water. This actively responds to the environmental protection policy of energy conservation and emission reduction, and also reduces long-term operating costs for users.

[0043] Furthermore, traditional shoe washing machines rely on direct and intense friction between brush bristles and the shoe upper, which can easily cause scratches, pilling, or deformation of delicate materials (such as suede, mesh, and leather). This solution utilizes the hydrodynamic force of cavitation bubble collapse for cleaning, avoiding direct contact between hard brush bristles and the shoe upper, thus fundamentally eliminating the risk of damage caused by mechanical friction. It is particularly suitable for the maintenance cleaning of high-end footwear. By reducing or eliminating reliance on mechanical rotating brushes, the system's mechanical structure is simplified, and potential points of failure in moving parts are correspondingly reduced, contributing to improved overall equipment reliability and lifespan.

[0044] Furthermore, the core innovation of the technical solution provided in this embodiment lies in the improvement of the water inlet path (i.e., replacing ordinary pipes with Laval nozzles), without requiring disruptive changes to the main structure of the washing tub or the drive system. This allows existing shoe washing machine product platforms to integrate this technology at a lower cost and with a faster R&D cycle, greatly enhancing the commercial feasibility and promotional value of the technology.

[0045] In summary, the technical solution provided in this embodiment, by introducing the Laval nozzle as a core component, upgrades the cleaning method from passive "hydraulic flushing" and rough "mechanical friction" to active "high-energy physical blasting," thereby achieving a qualitative leap in terms of cleaning power, water conservation, care properties, and reliability, representing an important development direction for cleaning technology.

[0046] See Figure 1 The Laval nozzle includes: The constriction section A has a pipe cross-sectional area that gradually decreases along the water flow direction, which is used to gradually convert the pressure energy of the high-pressure water flow into kinetic energy, so that the water flow continues to accelerate. Throat B, connected to the end of the contraction section A, is the part with the smallest cross-sectional area in the Laval nozzle and is the starting point for cavitation effect; Expansion section C, connected after the throat B, has a pipe cross-sectional area that gradually increases along the water flow direction; The cross-sectional area of ​​the water outlet of the expansion section C is greater than or equal to the cross-sectional area of ​​the water inlet of the contraction section A.

[0047] Understandably, according to the basic principles of Laval nozzles, the outlet cross-sectional area of ​​its expansion section must be larger than the throat cross-sectional area, and is usually also larger than or equal to the inlet cross-sectional area, in order to achieve pressure recovery and stable fluid expansion.

[0048] See Figure 2The tapering structure of the constriction section forces the high-pressure water flow to accelerate. According to Bernoulli's principle (a law in fluid mechanics proposed by the Swiss fluid physicist Daniel Bernoulli in 1726; it is a fundamental principle used in hydraulics, namely: kinetic energy + gravitational potential energy + pressure potential energy = constant; its most famous corollary is: at the same height, the higher the velocity, the lower the pressure), the pressure energy of the water is efficiently converted into kinetic energy. This creates the primary condition for the occurrence of cavitation. The water flow reaches its peak velocity at the throat, where the cross-sectional area is smallest, while the pressure drops to its lowest point. When the pressure is lower than the saturated vapor pressure of water, a large number of cavitation bubbles are instantly generated in the water. The throat, as the "cavitation engine," is the physical core of the entire cleaning process. This structure ensures the efficient and concentrated generation of cavitation bubbles, providing sufficient energy for subsequent cleaning using their collapse energy.

[0049] The gradually expanding structure of the expansion section slows down the high-speed water flow, converting kinetic energy back into pressure energy and achieving a smooth pressure recovery. This process is crucial, as it prevents cavitation bubbles from collapsing prematurely within the pipe. The stable expanding flow field provides a "protective shield" for the generated cavitation bubbles, allowing them to maintain their shape and be transported with the water flow to the surface of the object to be cleaned (such as a shoe upper), thus collapsing only at the location where cleaning is needed and releasing the impact energy.

[0050] The Laval nozzle structure is a highly efficient energy converter. Its physical design amplifies water flow energy, meaning it can produce a powerful cleaning effect with relatively little water and energy input. Compared to traditional methods that rely on high flow rates and high water pressure, this significantly saves water and electricity, meeting green environmental protection requirements.

[0051] Because its cleaning power originates from the microscopic shock waves generated by the collapse of cavitation bubbles, it possesses a powerful physical force that effectively breaks down stubborn stains. Simultaneously, since it's a non-contact cleaning method (water flow impact rather than brush friction), it completely avoids scratching or pilling delicate materials (such as leather and mesh) caused by stiff bristles, achieving a perfect balance between powerful stain removal and gentle care.

[0052] Example 2 A cleaning apparatus according to an exemplary embodiment includes: The housing, and the washing tub located inside the housing; The water inlet valve, located at the upper rear part of the housing, is used to connect to an external water source; Laval nozzle (see) Figure 1 The water is drawn from the inlet valve and used to direct water to the washing tub; A distributor or spray arm, with one end connected to the end of the Laval nozzle and the other end connected to a spray head, is used to evenly spray the high-energy cavitation water flow generated by the Laval nozzle onto the surface of the items to be washed in the washing tub. A UVC sterilization module (Ultraviolet C, C-band ultraviolet light) is installed on the top or upper side wall of the washing tub; or... If the cleaning equipment adopts a central impeller or rotating spray arm structure, the UVC sterilization module is installed at a preset angle inside the central shaft of the central impeller or rotating spray arm, and light radiates outward through the light-transmitting window; or... The UVC sterilization module is integrated on the inner panel of the door, and when the door is closed, the UVC sterilization module faces the washing tub.

[0053] It should be noted that the UVC sterilization module has a wavelength range of 200-280 nanometers. Due to its high energy, it has a strong destructive effect on the DNA or RNA of microorganisms such as bacteria and viruses, and is therefore widely used in the field of sterilization and disinfection.

[0054] The UVC sterilization module is embedded in the top of the inner wall of the washing tub and sealed with a highly transparent quartz glass cover to isolate it from the interior of the tub. Located at the top, it maximizes direct irradiation of the top and sides of all items (shoes) inside the tub, providing the widest possible irradiation range. The sterilization effect of UVC is inversely proportional to the square of the distance, and the top position ensures optimal sterilization distance from the shoes. Furthermore, its top location minimizes the risk of being completely blocked by shoes or the spray arms, and wiring is relatively convenient, allowing for integration with the top cover structure.

[0055] If the cleaning equipment adopts a central impeller or rotating spray arm structure, the UVC sterilization module is installed at a preset angle inside the central shaft of the central impeller or rotating spray arm. Light radiates outward through the light-transmitting window. As the impeller or spray arm rotates, the UVC light can achieve 360-degree scanning sterilization without dead angles, resulting in extremely uniform and thorough effects. Moreover, this installation position makes full use of the central space, avoiding structural conflicts that may be caused by installation on the side wall.

[0056] If the UVC sterilization module is integrated into the internal panel of the door, it will face the washing tub when the door is closed. The UVC lamp will shut off as soon as the door is opened, ensuring high safety and effectively illuminating the front of the shoes. However, the back and bottom of the shoes may be obstructed, requiring the use of water refraction or reflection to compensate.

[0057] Preferably, the built-in UVC sterilization module is installed in the center of the top of the washing tub: it is installed inside the waterproof cover at the top of the cavity, using a ring or array layout (2-4 UVC lamps / LED modules), and the installation height is 15-20cm from the top of the shoe rack. The UVC lamps are protected by a quartz glass cover, with high UV transmittance (>90%), and are waterproof and explosion-proof.

[0058] Understandably, the high-energy cavitation water jet generated by the Laval nozzle is rich in micron-sized cavitation bubbles. These cavitation bubbles collapse instantly upon impacting the surface of the item to be washed (such as shoes), generating extremely high local shock waves and microjets. This powerful physical force can effectively penetrate fiber gaps, thoroughly peeling off and removing stubborn stains (such as oil and mud) that are difficult to remove with traditional brushing or ordinary water flow.

[0059] Because cleaning relies on cavitation bubbles in the water flow, it can cover the entire surface of the item to be washed without any blind spots, including the complex curves of the shoe upper, gaps, and areas under the shoelaces that a brush cannot effectively reach, achieving a leap from "rough brushing" to "fine immersion cleaning".

[0060] The core advantage of the technical solution provided in this embodiment lies in the fact that it does not rely on a large flow of water to "wash away" stains, but rather "explodes" stains by increasing the energy per unit volume of the water flow (i.e., generating a cavitation effect). Therefore, it can achieve a cleaning effect far exceeding that of traditional technologies with less water. This actively responds to the environmental protection policy of energy conservation and emission reduction, and also reduces long-term operating costs for users.

[0061] Furthermore, traditional shoe washing machines rely on direct and intense friction between brush bristles and the shoe upper, which can easily cause scratches, pilling, or deformation of delicate materials (such as suede, mesh, and leather). This solution utilizes the hydrodynamic force of cavitation bubble collapse for cleaning, avoiding direct contact between hard brush bristles and the shoe upper, thus fundamentally eliminating the risk of damage caused by mechanical friction. It is particularly suitable for the maintenance cleaning of high-end footwear. By reducing or eliminating reliance on mechanical rotating brushes, the system's mechanical structure is simplified, and potential points of failure in moving parts are correspondingly reduced, contributing to improved overall equipment reliability and lifespan.

[0062] Furthermore, the core innovation of the technical solution provided in this embodiment lies in the improvement of the water inlet path (i.e., replacing ordinary pipes with Laval nozzles), without requiring disruptive changes to the main structure of the washing tub or the drive system. This allows existing shoe washing machine product platforms to integrate this technology at a lower cost and with a faster R&D cycle, greatly enhancing the commercial feasibility and promotional value of the technology.

[0063] The high-energy cavitation water flow generated by the Laval nozzle can powerfully strip away and wash away dirt and biofilm (the "protective shield" of bacteria) on the shoe surface, directly exposing the attached bacteria and viruses, creating optimal conditions for direct irradiation by UVC light, and significantly improving sterilization efficiency.

[0064] The UVC sterilization module works simultaneously during the cleaning process, which can completely inactivate the microorganisms washed away by the cavitation water flow and any remaining microorganisms, fundamentally eliminating cross-infection and odor growth, and achieving a qualitative change from looking clean to truly hygienic and sterile.

[0065] In summary, the technical solution provided in this embodiment, by introducing the Laval nozzle as a core component, upgrades the cleaning method from passive "hydraulic flushing" and rough "mechanical friction" to active "high-energy physical blasting," thereby achieving a qualitative leap in terms of cleaning power, water conservation, care properties, and reliability, representing an important development direction for cleaning technology.

[0066] Through the synergistic effect of cavitation washing and UVC sterilization, it achieves a dual breakthrough in cleanliness and health in its core functions. Furthermore, the flexible installation design of the UVC sterilization module ensures the reliability and safety of its effects from an engineering perspective. Ultimately, it provides an advanced cleaning solution that truly achieves "washing and disinfection in one"—far surpassing traditional technologies—bringing users a cleaner, healthier, and safer experience. It ultimately realizes a complete cleaning process integrating "decontamination-sterilization-rinsing," providing users with an unprecedented, health-level cleanliness experience.

[0067] Example 3 A cleaning apparatus according to an exemplary embodiment includes: The housing, and the washing tub located inside the housing; The water inlet valve, located at the upper rear part of the housing, is used to connect to an external water source; Laval nozzle (see) Figure 1 The water is drawn from the inlet valve and used to direct water to the washing tub; A distributor or spray arm, with one end connected to the end of the Laval nozzle and the other end connected to a spray head, is used to evenly spray the high-energy cavitation water flow generated by the Laval nozzle onto the surface of the items to be washed in the washing tub. A UVC sterilization module (Ultraviolet C, C-band ultraviolet light) is installed on the top or upper side wall of the washing tub; or... If the cleaning equipment adopts a central impeller or rotating spray arm structure, the UVC sterilization module is installed at a preset angle inside the central shaft of the central impeller or rotating spray arm, and light radiates outward through the light-transmitting window; or... The UVC sterilization module is integrated on the inner panel of the door, and when the door is closed, the UVC sterilization module faces the washing tub.

[0068] The water inlet valve is an electric water inlet valve, and the cleaning equipment also includes: A high-pressure water pump, located after the inlet valve and before the Laval nozzle, is used to provide sufficiently high pressure for the water flow; The controller is connected to the inlet valve, the high-pressure water pump, and the UVC sterilization module.

[0069] It should be noted that the controller serves as the intelligent control center for the entire cleaning equipment. Through preset programs and real-time signal feedback, it coordinates the control of the inlet valve, high-pressure water pump, and UVC sterilization module. The controller stores various cleaning programs (such as standard wash, quick wash, and intensive wash). Once the user selects a mode and starts the process, the controller will automatically and systematically execute at least the following steps: Start-up phase: The controller first opens the electric inlet valve to allow water to enter the system.

[0070] Pre-wash stage: The controller may start the high-pressure water pump at a low power to generate a gentle water flow for pre-wetting.

[0071] Main wash phase: The controller commands the high-pressure water pump to increase to its rated power, generating a high-pressure water flow to drive the cavitation effect, and simultaneously starts the UVC sterilization module.

[0072] Final stage: After the main wash is completed, the controller sequentially shuts down the UVC module, adjusts the water pump power for rinsing, and finally performs dehydration and shuts down all components.

[0073] It should be noted that the UVC sterilization module has a wavelength range of 200-280 nanometers. Due to its high energy, it has a strong destructive effect on the DNA or RNA of microorganisms such as bacteria and viruses, and is therefore widely used in the field of sterilization and disinfection.

[0074] The UVC sterilization module is embedded in the top of the inner wall of the washing tub and sealed with a highly transparent quartz glass cover to isolate it from the interior of the tub. Located at the top, it maximizes direct irradiation of the top and sides of all items (shoes) inside the tub, providing the widest possible irradiation range. The sterilization effect of UVC is inversely proportional to the square of the distance, and the top position ensures optimal sterilization distance from the shoes. Furthermore, its top location minimizes the risk of being completely blocked by shoes or the spray arms, and wiring is relatively convenient, allowing for integration with the top cover structure.

[0075] If the cleaning equipment adopts a central impeller or rotating spray arm structure, the UVC sterilization module is installed at a preset angle inside the central shaft of the central impeller or rotating spray arm. Light radiates outward through the light-transmitting window. As the impeller or spray arm rotates, the UVC light can achieve 360-degree scanning sterilization without dead angles, resulting in extremely uniform and thorough effects. Moreover, this installation position makes full use of the central space, avoiding structural conflicts that may be caused by installation on the side wall.

[0076] If the UVC sterilization module is integrated into the internal panel of the door, it will face the washing tub when the door is closed. The UVC lamp will shut off as soon as the door is opened, ensuring high safety and effectively illuminating the front of the shoes. However, the back and bottom of the shoes may be obstructed, requiring the use of water refraction or reflection to compensate.

[0077] Understandably, the high-energy cavitation water jet generated by the Laval nozzle is rich in micron-sized cavitation bubbles. These cavitation bubbles collapse instantly upon impacting the surface of the item to be washed (such as shoes), generating extremely high local shock waves and microjets. This powerful physical force can effectively penetrate fiber gaps, thoroughly peeling off and removing stubborn stains (such as oil and mud) that are difficult to remove with traditional brushing or ordinary water flow.

[0078] Because cleaning relies on cavitation bubbles in the water flow, it can cover the entire surface of the item to be washed without any blind spots, including the complex curves of the shoe upper, gaps, and areas under the shoelaces that a brush cannot effectively reach, achieving a leap from "rough brushing" to "fine immersion cleaning".

[0079] The core advantage of the technical solution provided in this embodiment lies in the fact that it does not rely on a large flow of water to "wash away" stains, but rather "explodes" stains by increasing the energy per unit volume of the water flow (i.e., generating a cavitation effect). Therefore, it can achieve a cleaning effect far exceeding that of traditional technologies with less water. This actively responds to the environmental protection policy of energy conservation and emission reduction, and also reduces long-term operating costs for users.

[0080] Furthermore, traditional shoe washing machines rely on direct and intense friction between brush bristles and the shoe upper, which can easily cause scratches, pilling, or deformation of delicate materials (such as suede, mesh, and leather). This solution utilizes the hydrodynamic force of cavitation bubble collapse for cleaning, avoiding direct contact between hard brush bristles and the shoe upper, thus fundamentally eliminating the risk of damage caused by mechanical friction. It is particularly suitable for the maintenance cleaning of high-end footwear. By reducing or eliminating reliance on mechanical rotating brushes, the system's mechanical structure is simplified, and potential points of failure in moving parts are correspondingly reduced, contributing to improved overall equipment reliability and lifespan.

[0081] Furthermore, the core innovation of the technical solution provided in this embodiment lies in the improvement of the water inlet path (i.e., replacing ordinary pipes with Laval nozzles), without requiring disruptive changes to the main structure of the washing tub or the drive system. This allows existing shoe washing machine product platforms to integrate this technology at a lower cost and with a faster R&D cycle, greatly enhancing the commercial feasibility and promotional value of the technology.

[0082] The high-energy cavitation water flow generated by the Laval nozzle can powerfully strip away and wash away dirt and biofilm (the "protective shield" of bacteria) on the shoe surface, directly exposing the attached bacteria and viruses, creating optimal conditions for direct irradiation by UVC light, and significantly improving sterilization efficiency.

[0083] The UVC sterilization module works simultaneously during the cleaning process, which can completely inactivate the microorganisms washed away by the cavitation water flow and any remaining microorganisms, fundamentally eliminating cross-infection and odor growth, and achieving a qualitative change from looking clean to truly hygienic and sterile.

[0084] In summary, the technical solution provided in this embodiment, by introducing the Laval nozzle as a core component, upgrades the cleaning method from passive "hydraulic flushing" and rough "mechanical friction" to active "high-energy physical blasting," thereby achieving a qualitative leap in terms of cleaning power, water conservation, care properties, and reliability, representing an important development direction for cleaning technology.

[0085] Through the synergistic effect of cavitation washing and UVC sterilization, it achieves a dual breakthrough in cleanliness and health in its core functions. Furthermore, the flexible installation design of the UVC sterilization module ensures the reliability and safety of its effects from an engineering perspective. Ultimately, it provides an advanced cleaning solution that truly achieves "washing and disinfection in one"—far surpassing traditional technologies—bringing users a cleaner, healthier, and safer experience. It ultimately realizes a complete cleaning process integrating "decontamination-sterilization-rinsing," providing users with an unprecedented, health-level cleanliness experience.

[0086] Example 4 A control method for a cleaning device according to an exemplary embodiment is disclosed, the control method comprising: During the main wash phase, the high-pressure water pump is activated to pressurize the water and deliver it to the Laval nozzle. This causes the water flow to accelerate as it passes through the constriction section of the Laval nozzle, where the pressure drops to its minimum. A large number of cavitation bubbles are generated here, and the high-speed water flow rich in cavitation bubbles is ejected from the expansion section of the Laval nozzle, directly impacting the surface of the item to be washed, achieving deep cleaning.

[0087] It should be noted that the technical solution provided in this embodiment is loaded and runs in the controller of the cleaning equipment described in Embodiment 3.

[0088] Understandably, the high-energy cavitation water jet generated by the Laval nozzle is rich in micron-sized cavitation bubbles. These cavitation bubbles collapse instantly upon impacting the surface of the item to be washed (such as shoes), generating extremely high local shock waves and microjets. This powerful physical force can effectively penetrate fiber gaps, thoroughly peeling off and removing stubborn stains (such as oil and mud) that are difficult to remove with traditional brushing or ordinary water flow.

[0089] Because cleaning relies on cavitation bubbles in the water flow, it can cover the entire surface of the item to be washed without any blind spots, including the complex curves of the shoe upper, gaps, and areas under the shoelaces that a brush cannot effectively reach, achieving a leap from "rough brushing" to "fine immersion cleaning".

[0090] The core advantage of the technical solution provided in this embodiment lies in the fact that it does not rely on a large flow of water to "wash away" stains, but rather "explodes" stains by increasing the energy per unit volume of the water flow (i.e., generating a cavitation effect). Therefore, it can achieve a cleaning effect far exceeding that of traditional technologies with less water. This actively responds to the environmental protection policy of energy conservation and emission reduction, and also reduces long-term operating costs for users.

[0091] Furthermore, traditional shoe washing machines rely on direct and intense friction between brush bristles and the shoe upper, which can easily cause scratches, pilling, or deformation of delicate materials (such as suede, mesh, and leather). This solution utilizes the hydrodynamic force of cavitation bubble collapse for cleaning, avoiding direct contact between hard brush bristles and the shoe upper, thus fundamentally eliminating the risk of damage caused by mechanical friction. It is particularly suitable for the maintenance cleaning of high-end footwear. By reducing or eliminating reliance on mechanical rotating brushes, the system's mechanical structure is simplified, and potential points of failure in moving parts are correspondingly reduced, contributing to improved overall equipment reliability and lifespan.

[0092] Furthermore, the core innovation of the technical solution provided in this embodiment lies in the improvement of the water inlet path (i.e., replacing ordinary pipes with Laval nozzles), without requiring disruptive changes to the main structure of the washing tub or the drive system. This allows existing shoe washing machine product platforms to integrate this technology at a lower cost and with a faster R&D cycle, greatly enhancing the commercial feasibility and promotional value of the technology.

[0093] Example 5 Figure 3 This is a flowchart illustrating a control method for a cleaning device according to an exemplary embodiment. See also... Figure 3 The control method includes: Step S11: During the main wash stage, start the high-pressure water pump to pressurize the water and deliver it to the Laval nozzle so that the water flow accelerates when passing through the constriction section of the Laval nozzle. The pressure drops to the minimum at the throat of the Laval nozzle, where a large number of cavitation bubbles are generated. The high-speed water flow rich in cavitation bubbles is ejected from the expansion section of the Laval nozzle and directly impacts the surface of the item to be washed, achieving deep cleaning. Step S12: While cavitation washing is in progress, the UVC sterilization module is activated to emit short-wave ultraviolet light to irradiate the surface of the items to be washed.

[0094] It should be noted that the technical solution provided in this embodiment is loaded and runs in the controller of the cleaning equipment described in Embodiment 3.

[0095] It should be noted that the UVC sterilization module has a wavelength range of 200-280 nanometers. Due to its high energy, it has a strong destructive effect on the DNA or RNA of microorganisms such as bacteria and viruses, and is therefore widely used in the field of sterilization and disinfection.

[0096] Understandably, the high-energy cavitation water jet generated by the Laval nozzle is rich in micron-sized cavitation bubbles. These cavitation bubbles collapse instantly upon impacting the surface of the item to be washed (such as shoes), generating extremely high local shock waves and microjets. This powerful physical force can effectively penetrate fiber gaps, thoroughly peeling off and removing stubborn stains (such as oil and mud) that are difficult to remove with traditional brushing or ordinary water flow.

[0097] Because cleaning relies on cavitation bubbles in the water flow, it can cover the entire surface of the item to be washed without any blind spots, including the complex curves of the shoe upper, gaps, and areas under the shoelaces that a brush cannot effectively reach, achieving a leap from "rough brushing" to "fine immersion cleaning".

[0098] The core advantage of the technical solution provided in this embodiment lies in the fact that it does not rely on a large flow of water to "wash away" stains, but rather "explodes" stains by increasing the energy per unit volume of the water flow (i.e., generating a cavitation effect). Therefore, it can achieve a cleaning effect far exceeding that of traditional technologies with less water. This actively responds to the environmental protection policy of energy conservation and emission reduction, and also reduces long-term operating costs for users.

[0099] Furthermore, traditional shoe washing machines rely on direct and intense friction between brush bristles and the shoe upper, which can easily cause scratches, pilling, or deformation of delicate materials (such as suede, mesh, and leather). This solution utilizes the hydrodynamic force of cavitation bubble collapse for cleaning, avoiding direct contact between hard brush bristles and the shoe upper, thus fundamentally eliminating the risk of damage caused by mechanical friction. It is particularly suitable for the maintenance cleaning of high-end footwear. By reducing or eliminating reliance on mechanical rotating brushes, the system's mechanical structure is simplified, and potential points of failure in moving parts are correspondingly reduced, contributing to improved overall equipment reliability and lifespan.

[0100] Furthermore, the core innovation of the technical solution provided in this embodiment lies in the improvement of the water inlet path (i.e., replacing ordinary pipes with Laval nozzles), without requiring disruptive changes to the main structure of the washing tub or the drive system. This allows existing shoe washing machine product platforms to integrate this technology at a lower cost and with a faster R&D cycle, greatly enhancing the commercial feasibility and promotional value of the technology.

[0101] The high-energy cavitation water flow generated by the Laval nozzle can powerfully strip away and wash away dirt and biofilm (the "protective shield" of bacteria) on the shoe surface, directly exposing the attached bacteria and viruses, creating optimal conditions for direct irradiation by UVC light, and significantly improving sterilization efficiency.

[0102] The UVC sterilization module works simultaneously during the cleaning process, which can completely inactivate the microorganisms washed away by the cavitation water flow and any remaining microorganisms, fundamentally eliminating cross-infection and odor growth, and achieving a qualitative change from looking clean to truly hygienic and sterile.

[0103] In summary, the technical solution provided in this embodiment, by introducing the Laval nozzle as a core component, upgrades the cleaning method from passive "hydraulic flushing" and rough "mechanical friction" to active "high-energy physical blasting," thereby achieving a qualitative leap in terms of cleaning power, water conservation, care properties, and reliability, representing an important development direction for cleaning technology.

[0104] Through the synergistic effect of cavitation washing and UVC sterilization, it achieves a dual breakthrough in cleanliness and health in its core functions. Furthermore, the flexible installation design of the UVC sterilization module ensures the reliability and safety of its effects from an engineering perspective. Ultimately, it provides an advanced cleaning solution that truly achieves "washing and disinfection in one"—far surpassing traditional technologies—bringing users a cleaner, healthier, and safer experience. It ultimately realizes a complete cleaning process integrating "decontamination-sterilization-rinsing," providing users with an unprecedented, health-level cleanliness experience.

[0105] Example 6 Figure 4 This is a flowchart illustrating a control method for a cleaning device according to another exemplary embodiment, see [link to flowchart]. Figure 4 The control method includes: Step S21: Start the high-pressure water pump to establish basic water pressure; Step S22: Close the bypass valve and open the Laval nozzle; Step S23: Adjust the frequency of the high-pressure water pump so that the flow velocity at the throat of the Laval nozzle reaches the critical value; Step S24: Start the UVC sterilization module, and at the same time, cavitation cleaning continues for a first duration, then intermittently for a second duration, and alternately cycle N times, where the second duration is shorter than the first duration; Step S25: Monitor the cavitation noise intensity using a high-frequency acoustic sensor. If the cavitation noise intensity is insufficient, increase the speed of the high-pressure water pump. If the cavitation noise intensity is too high, decrease the speed of the high-pressure water pump. Step S26: After the cavitation washing is completed, turn off the UVC sterilization module.

[0106] It should be noted that the technical solution provided in this embodiment is loaded and runs in the controller of the cleaning equipment described in Embodiment 3.

[0107] It should be noted that the first preset duration and the second preset duration are set based on empirical values ​​or experimental data. For example, the first preset duration is set to 120s and the second preset duration is set to 15s.

[0108] When the throat velocity of the Laval nozzle reaches a critical value, the pressure values ​​P1 and P2 monitored by the pressure sensors before and after the throat ensure that ΔP = P2 - P1 > the threshold, indicating that the throat velocity has reached the critical value.

[0109] UVC sterilization modules have a wavelength range of 200-280 nanometers. Due to their high energy, they have a strong destructive effect on the DNA or RNA of microorganisms such as bacteria and viruses, and are therefore widely used in the field of sterilization and disinfection.

[0110] Understandably, the high-energy cavitation water jet generated by the Laval nozzle is rich in micron-sized cavitation bubbles. These cavitation bubbles collapse instantly upon impacting the surface of the item to be washed (such as shoes), generating extremely high local shock waves and microjets. This powerful physical force can effectively penetrate fiber gaps, thoroughly peeling off and removing stubborn stains (such as oil and mud) that are difficult to remove with traditional brushing or ordinary water flow.

[0111] Because cleaning relies on cavitation bubbles in the water flow, it can cover the entire surface of the item to be washed without any blind spots, including the complex curves of the shoe upper, gaps, and areas under the shoelaces that a brush cannot effectively reach, achieving a leap from "rough brushing" to "fine immersion cleaning".

[0112] The core advantage of the technical solution provided in this embodiment lies in the fact that it does not rely on a large flow of water to "wash away" stains, but rather "explodes" stains by increasing the energy per unit volume of the water flow (i.e., generating a cavitation effect). Therefore, it can achieve a cleaning effect far exceeding that of traditional technologies with less water. This actively responds to the environmental protection policy of energy conservation and emission reduction, and also reduces long-term operating costs for users.

[0113] Furthermore, traditional shoe washing machines rely on direct and intense friction between brush bristles and the shoe upper, which can easily cause scratches, pilling, or deformation of delicate materials (such as suede, mesh, and leather). This solution utilizes the hydrodynamic force of cavitation bubble collapse for cleaning, avoiding direct contact between hard brush bristles and the shoe upper, thus fundamentally eliminating the risk of damage caused by mechanical friction. It is particularly suitable for the maintenance cleaning of high-end footwear. By reducing or eliminating reliance on mechanical rotating brushes, the system's mechanical structure is simplified, and potential points of failure in moving parts are correspondingly reduced, contributing to improved overall equipment reliability and lifespan.

[0114] Furthermore, the core innovation of the technical solution provided in this embodiment lies in the improvement of the water inlet path (i.e., replacing ordinary pipes with Laval nozzles), without requiring disruptive changes to the main structure of the washing tub or the drive system. This allows existing shoe washing machine product platforms to integrate this technology at a lower cost and with a faster R&D cycle, greatly enhancing the commercial feasibility and promotional value of the technology.

[0115] The high-energy cavitation water flow generated by the Laval nozzle can powerfully strip away and wash away dirt and biofilm (the "protective shield" of bacteria) on the shoe surface, directly exposing the attached bacteria and viruses, creating optimal conditions for direct irradiation by UVC light, and significantly improving sterilization efficiency.

[0116] The UVC sterilization module works simultaneously during the cleaning process, which can completely inactivate the microorganisms washed away by the cavitation water flow and any remaining microorganisms, fundamentally eliminating cross-infection and odor growth, and achieving a qualitative change from looking clean to truly hygienic and sterile.

[0117] In summary, the technical solution provided in this embodiment, by introducing the Laval nozzle as a core component, upgrades the cleaning method from passive "hydraulic flushing" and rough "mechanical friction" to active "high-energy physical blasting," thereby achieving a qualitative leap in terms of cleaning power, water conservation, care properties, and reliability, representing an important development direction for cleaning technology.

[0118] Through the synergistic effect of cavitation washing and UVC sterilization, it achieves a dual breakthrough in cleanliness and health in its core functions. Furthermore, the flexible installation design of the UVC sterilization module ensures the reliability and safety of its effects from an engineering perspective. Ultimately, it provides an advanced cleaning solution that truly achieves "washing and disinfection in one"—far surpassing traditional technologies—bringing users a cleaner, healthier, and safer experience. It ultimately realizes a complete cleaning process integrating "decontamination-sterilization-rinsing," providing users with an unprecedented, health-level cleanliness experience.

[0119] Example 7 Figure 5This is a flowchart illustrating a control method for a cleaning device according to another exemplary embodiment, see [link to flowchart]. Figure 5 The control method includes: Step S31, User Initialization: After detecting that the user has put the shoes to be cleaned into the washing chamber and closing the chamber door, the system receives the washing mode selected by the user on the control panel. Step S32, System Self-Check: Check whether the door is securely locked to prevent water leakage or UV leakage during washing; check whether the water level sensor is functioning normally; check whether the protection mechanism of the UVC sterilization module is ready to ensure that the UVC sterilization module cannot be activated when the door is open, thus ensuring user safety. Step S33, Pre-wash stage: The control system injects room temperature water, does not activate the high-pressure mode of the Laval nozzle, and uses the normal water flow mode to spray or soak the items to be cleaned for a time shorter than the preset duration. Step S34: During the main wash stage, the high-pressure water pump is started to pressurize the water and deliver it to the Laval nozzle. This causes the water flow to accelerate as it passes through the constriction section of the Laval nozzle, where the pressure drops to its minimum. A large number of cavitation bubbles are generated here, and the high-speed water flow rich in cavitation bubbles is ejected from the expansion section of the Laval nozzle, directly impacting the surface of the item to be washed for deep cleaning. While the cavitation washing is in progress, the UVC sterilization module is activated to emit short-wave ultraviolet light to irradiate the surface of the item to be washed. Step S35, Rinsing Stage: Open the bypass valve, close the Laval nozzle, control the system to inject clean water, use normal water flow for three hours, drain, then inject clean water again, alternate the cycle N times to thoroughly rinse away detergent residue and suspended dirt. Step S36, Dehydration stage: High-speed rotation dehydration continues for the fourth preset time, followed by low-speed intermittent rotation to promote ventilation; Step S37: After the system stops all operations, turn off the high-pressure water pump, unlock the door, notify the user that cleaning is complete, and display the cleanliness score.

[0120] It should be noted that the technical solution provided in this embodiment is loaded and runs in the controller of the cleaning equipment described in Embodiment 3.

[0121] Preferably, step S34 can also be implemented using the scheme of Embodiment Six.

[0122] It should be noted that the preset duration, first preset duration, second preset duration, third preset duration, and fourth preset duration are set based on empirical values ​​or experimental data. For example, the preset duration is set to 30s, the first preset duration is set to 120s, the second preset duration is set to 15s, the third preset duration is set to 60s, and the fourth preset duration is set to 180s.

[0123] UVC sterilization modules have a wavelength range of 200-280 nanometers. Due to their high energy, they have a strong destructive effect on the DNA or RNA of microorganisms such as bacteria and viruses, and are therefore widely used in the field of sterilization and disinfection.

[0124] Understandably, the high-energy cavitation water jet generated by the Laval nozzle is rich in micron-sized cavitation bubbles. These cavitation bubbles collapse instantly upon impacting the surface of the item to be washed (such as shoes), generating extremely high local shock waves and microjets. This powerful physical force can effectively penetrate fiber gaps, thoroughly peeling off and removing stubborn stains (such as oil and mud) that are difficult to remove with traditional brushing or ordinary water flow.

[0125] Because cleaning relies on cavitation bubbles in the water flow, it can cover the entire surface of the item to be washed without any blind spots, including the complex curves of the shoe upper, gaps, and areas under the shoelaces that a brush cannot effectively reach, achieving a leap from "rough brushing" to "fine immersion cleaning".

[0126] The core advantage of the technical solution provided in this embodiment lies in the fact that it does not rely on a large flow of water to "wash away" stains, but rather "explodes" stains by increasing the energy per unit volume of the water flow (i.e., generating a cavitation effect). Therefore, it can achieve a cleaning effect far exceeding that of traditional technologies with less water. This actively responds to the environmental protection policy of energy conservation and emission reduction, and also reduces long-term operating costs for users.

[0127] Furthermore, traditional shoe washing machines rely on direct and intense friction between brush bristles and the shoe upper, which can easily cause scratches, pilling, or deformation of delicate materials (such as suede, mesh, and leather). This solution utilizes the hydrodynamic force of cavitation bubble collapse for cleaning, avoiding direct contact between hard brush bristles and the shoe upper, thus fundamentally eliminating the risk of damage caused by mechanical friction. It is particularly suitable for the maintenance cleaning of high-end footwear. By reducing or eliminating reliance on mechanical rotating brushes, the system's mechanical structure is simplified, and potential points of failure in moving parts are correspondingly reduced, contributing to improved overall equipment reliability and lifespan.

[0128] Furthermore, the core innovation of the technical solution provided in this embodiment lies in the improvement of the water inlet path (i.e., replacing ordinary pipes with Laval nozzles), without requiring disruptive changes to the main structure of the washing tub or the drive system. This allows existing shoe washing machine product platforms to integrate this technology at a lower cost and with a faster R&D cycle, greatly enhancing the commercial feasibility and promotional value of the technology.

[0129] The high-energy cavitation water flow generated by the Laval nozzle can powerfully strip away and wash away dirt and biofilm (the "protective shield" of bacteria) on the shoe surface, directly exposing the attached bacteria and viruses, creating optimal conditions for direct irradiation by UVC light, and significantly improving sterilization efficiency.

[0130] The UVC sterilization module works simultaneously during the cleaning process, which can completely inactivate the microorganisms washed away by the cavitation water flow and any remaining microorganisms, fundamentally eliminating cross-infection and odor growth, and achieving a qualitative change from looking clean to truly hygienic and sterile.

[0131] In summary, the technical solution provided in this embodiment, by introducing the Laval nozzle as a core component, upgrades the cleaning method from passive "hydraulic flushing" and rough "mechanical friction" to active "high-energy physical blasting," thereby achieving a qualitative leap in terms of cleaning power, water conservation, care properties, and reliability, representing an important development direction for cleaning technology.

[0132] Through the synergistic effect of cavitation washing and UVC sterilization, it achieves a dual breakthrough in cleanliness and health in its core functions. Furthermore, the flexible installation design of the UVC sterilization module ensures the reliability and safety of its effects from an engineering perspective. Ultimately, it provides an advanced cleaning solution that truly achieves "washing and disinfection in one"—far surpassing traditional technologies—bringing users a cleaner, healthier, and safer experience. It ultimately realizes a complete cleaning process integrating "decontamination-sterilization-rinsing," providing users with an unprecedented, health-level cleanliness experience.

[0133] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0134] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means at least two.

[0135] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0136] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0137] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0138] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0139] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0140] In the description of this specification, 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 the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer 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.

[0141] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A cleaning device, characterized in that, include: The housing, and the washing tub located inside the housing; The water inlet valve, located at the upper rear part of the housing, is used to connect to an external water source; A Laval nozzle, extending from the inlet valve, is used to direct water to the washing tub; A distributor or spray arm, with one end connected to the end of the Laval nozzle and the other end connected to a spray head, is used to evenly spray the high-energy cavitation water flow generated by the Laval nozzle onto the surface of the items to be washed in the washing tub.

2. The cleaning equipment according to claim 1, characterized in that, The Laval nozzle includes: The contraction section has a pipe cross-sectional area that gradually decreases along the water flow direction, which is used to gradually convert the pressure energy of the high-pressure water flow into kinetic energy, so that the water flow continues to accelerate. The throat, connected to the end of the contraction section, is the part with the smallest cross-sectional area in the Laval nozzle and is the starting point for cavitation. The expansion section, connected after the throat, has a pipe cross-sectional area that gradually increases along the direction of water flow; The cross-sectional area of ​​the water outlet of the expansion section is greater than or equal to the cross-sectional area of ​​the water inlet of the contraction section.

3. The cleaning equipment according to claim 1, characterized in that, Also includes: A UVC sterilization module is installed on the top or upper side wall of the washing tub; or... If the cleaning equipment adopts a central impeller or rotating spray arm structure, the UVC sterilization module is installed at a preset angle inside the central shaft of the central impeller or rotating spray arm, and light radiates outward through the light-transmitting window; or... The UVC sterilization module is integrated on the inner panel of the door, and when the door is closed, the UVC sterilization module faces the washing tub.

4. The cleaning equipment according to claim 3, characterized in that, The water inlet valve is an electric water inlet valve, and the cleaning equipment also includes: A high-pressure water pump, located after the inlet valve and before the Laval nozzle, is used to provide sufficiently high pressure for the water flow; The controller is connected to the inlet valve, the high-pressure water pump, and the UVC sterilization module.

5. The cleaning equipment according to any one of claims 1 to 4, characterized in that, include: Shoe washing machine.

6. A control method for a cleaning device, characterized in that, include: During the main wash phase, the high-pressure water pump is activated to pressurize the water and deliver it to the Laval nozzle. This causes the water flow to accelerate as it passes through the constriction section of the Laval nozzle, where the pressure drops to its minimum. A large number of cavitation bubbles are generated here, and the high-speed water flow rich in cavitation bubbles is ejected from the expansion section of the Laval nozzle, directly impacting the surface of the item to be washed, achieving deep cleaning.

7. The control method according to claim 6, characterized in that, Also includes: While cavitation washing is in progress, the UVC sterilization module is activated to emit short-wave ultraviolet light to irradiate the surface of the items to be washed.

8. The control method according to claim 7, characterized in that, While cavitation washing is in progress, the UVC sterilization module is activated to emit short-wave ultraviolet light to irradiate the surface of the items to be washed, including: Start the high-pressure water pump to establish basic water pressure; Close the bypass valve and open the Laval nozzle; Adjust the frequency of the high-pressure water pump so that the flow velocity at the throat of the Laval nozzle reaches the critical value; The UVC sterilization module is activated, and cavitation cleaning continues for a first duration, followed by an intermittent second duration, alternating and cycling N times, with the second duration being shorter than the first duration. The intensity of cavitation noise is monitored by a high-frequency acoustic sensor. If the intensity of cavitation noise is insufficient, the speed of the high-pressure water pump is increased; if the intensity of cavitation noise is too high, the speed of the high-pressure water pump is decreased. After cavitation washing is completed, turn off the UVC sterilization module.

9. The control method according to claim 6 or 7, further comprising, before the main washing stage: User initialization: After detecting that the user has put the shoes to be cleaned into the washing chamber and closing the chamber door, the system receives the washing mode selected by the user on the control panel. System self-check: Checks whether the door is securely locked to prevent water or UV leakage during washing; checks whether the water level sensor is functioning properly; checks whether the UVC sterilization module's protection mechanism is ready to ensure that the UVC sterilization module cannot be activated when the door is open, thus protecting user safety.

10. The control method according to claim 9, further comprising, between the system self-test and the main washing stage: Pre-wash stage: The control system injects room temperature water, does not activate the high-pressure mode of the Laval nozzle, and uses normal water flow mode to spray or soak the items to be cleaned for a time shorter than preset.

11. The control method according to claim 10, further comprising, after the main washing stage: Rinsing stage: Open the bypass valve, close the Laval nozzle, control the system to inject clean water, use normal water flow for three hours, drain, then inject clean water again, alternate the cycle N times to thoroughly rinse away detergent residue and suspended dirt. Dehydration stage: High-speed rotation dehydration continues for the fourth preset duration, followed by low-speed intermittent rotation to promote ventilation.

12. The control method according to claim 11, characterized in that, Also includes: After the system stops all operations, it shuts off the high-pressure water pump, unlocks the door, notifies the user that cleaning is complete, and displays a cleanliness score.

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