Direct current brushless cleaning machine

Abstract

The application discloses a direct-current brushless cleaning machine, which integrates a direct-current brushless air compressor, a water pump and an air storage tank in a machine shell, and the core is a fluid logic distribution valve group and a multi-mode control circuit. The valve group comprises a two-position three-way electromagnetic valve, a normally open gas electromagnetic valve and a normally closed liquid electromagnetic valve, and forms a hard logic interlocking loop. According to the instruction of a single selection switch on a spray gun, a microprocessor intelligently links and adjusts the on-off of each valve and the rotating speed of a motor, so that the on-line one-key switching of three modes of 'pure blowing', 'constant gas-liquid ratio micro water quantity atomization' and 'conventional water quantity spraying' is realized.

Description

Technical Field

[0001] This application relates to the field of cleaning equipment technology, and in particular to a DC brushless cleaning machine. Background Technology

[0002] Cleaning equipment is an indispensable tool in many fields, including car cleaning, property cleaning, furniture maintenance, and agricultural plant protection. Currently, mainstream cleaning equipment can be divided into two main categories: electric high-pressure water pump cleaners and split-type pneumatic spray cleaners. However, both have significant shortcomings when facing the demands of fine, environmentally friendly, and multimodal cleaning.

[0003] Electric high-pressure washers rely on a motor-driven high-pressure plunger pump to pressurize water to several megapascals or even tens of megapascals before spraying it out through nozzles with extremely small orifices. Their drawbacks are: First, high energy consumption and enormous water waste. A single car wash can consume tens to hundreds of liters of water, and the large amounts of wastewater containing chemical agents generated flow everywhere, causing serious surface pollution. Second, high-pressure water jets pose a very high risk of surface damage. The strong concentrated stress of the high-speed water jet can easily damage the paint and clear coat of high-end cars, leading to scratches, peeling, or deformation of rubber seals and whitening of plastic trim, resulting in high repair costs. Third, limited functionality. High-pressure water jets often cannot thoroughly clean areas such as engine compartment dust, wheel spoke gaps, and debris deep within air conditioning vents due to a lack of penetration and blowing ability, requiring a secondary treatment with a compressed air blower.

[0004] Another type of pneumatic spray cleaning gun system, which relies on an independent air compressor for air supply, partially avoids the damage problems caused by high-pressure water jets and enhances the cleaning ability of crevices through airflow penetration. However, it also has inherent weaknesses such as low integration, unstable operating conditions, and cumbersome operation. First, it requires a separate, bulky, and heavy air compressor to supply air through a long-distance air pipe, making the entire system unportable and greatly limiting its application in scenarios such as mobile car washes and outdoor cleaning. Second, long-distance transmission leads to significant pressure pulsation and pressure drop. When the air tank pressure drops to the compressor's starting threshold, the pressure drop in the pipeline caused by the heavy-load start-up of the motor directly results in inconsistent water mist flow from the cleaning gun, uneven foam consistency, and severely affects the softening and coating effect of the car wash liquid on dirt. Third, when switching between "dust blowing" and "spraying" functions, the operator usually has to walk to the air compressor to manually turn the valve group or plug and unplug connectors on the pipeline. It is impossible to achieve one-button switching of operating modes at the gun end, resulting in low work efficiency and a very poor user experience. In addition, in winter, the residual water vapor in the pneumatic pipelines in the workshop condenses and easily forms ice crystals inside the fine structures such as the solenoid valve core, the one-way valve diaphragm and the nozzle, which can cause the valve to jam, malfunction or the pipeline to freeze and crack. This is a long-standing technical problem that has not been solved.

[0005] In recent years, brushless DC motors have been widely used in small pumps and compressors due to their high efficiency, long lifespan, and excellent speed regulation performance. However, most existing cleaning machines using brushless DC motors simply replace AC motors, still relying on a single "high-pressure pump" model. They do not deeply couple the compressed air system and water pump system at the control and fluid circuit levels, thus failing to simultaneously meet the multi-functional integrated requirements of low-pressure safety, micro-water environmental protection, atomized penetration, and regular rinsing.

[0006] Therefore, how to design a portable cleaning machine that can organically integrate gas and liquid paths in principle, achieve automatic and reliable switching of multiple modes through intelligent control, and still ensure efficient atomization and stable rinsing performance under low-pressure conditions has become a technical bottleneck that urgently needs to be overcome. Summary of the Invention

[0007] The purpose of this application is to provide a DC brushless cleaning machine to overcome the core defects of existing high-pressure cleaners, such as easy damage to surfaces and waste of water resources, as well as the low integration, unstable operating conditions, and cumbersome mode switching of existing split-type pneumatic cleaners.

[0008] In a first aspect, embodiments of the present invention provide a DC brushless cleaning machine, comprising: chassis; An integrated power source module is located inside the housing. The power module includes a DC brushless air compressor module, an air tank, a DC brushless water pump module, and a water tank connected in sequence. A fluid logic distribution valve assembly, the valve assembly having a high-pressure gas input port, a liquid input port, a pure gas output port and a mixed fluid output port, and internally integrating: A two-position three-way solenoid valve has its inlet connected to the high-pressure gas input port, its first outlet connected to the pure gas output port, and its second outlet connected to the front end of the mixed fluid output port. The two-position three-way solenoid valve is configured such that: when de-energized, the inlet is connected to the first outlet and the second outlet is closed; when energized, the inlet is connected to the second outlet and the first outlet is closed. A normally open gas solenoid valve, the inlet end of which is connected to the high-pressure gas input port, and the outlet end of which is connected to the front end of the mixed fluid output port; A normally closed liquid solenoid valve, wherein the inlet end is connected to the liquid input port and the outlet end is connected to the front end of the mixed fluid output port; Handheld multi-functional spray gun; The multi-modal control circuit board integrates a microprocessor. The microprocessor is electrically connected to the mode selection switch on a handheld spray gun, the two-position three-way solenoid valve, the normally open gas solenoid valve, the normally closed liquid solenoid valve, the drive circuit of the air compressor module, and the drive circuit of the water pump module. The microprocessor is configured to independently control the on / off state of each solenoid valve and the motor speed of the air compressor and water pump according to the instructions of the mode selection switch, thereby realizing the automatic switching of at least three working modes.

[0009] Optionally, the gas outlet of the gas storage tank is connected to the high-pressure gas input port, the liquid outlet of the water pump module is connected to the liquid input port, and the pure gas output port and the mixed fluid output port are respectively connected to the pure gas interface and the mixed interface of the handheld multi-functional spray gun.

[0010] Optionally, the microprocessor's preset three operating mode control logic specifically includes: In response to the pure air blowing command, the two-position three-way solenoid valve and the normally closed liquid solenoid valve are de-energized, while the normally open gas solenoid valve is energized and closed, and the water pump module is stopped from running. Compressed air is only output from the pure air output port. In response to the micro-water atomization command, the two-position three-way solenoid valve is energized, the normally closed liquid solenoid valve is energized, the normally open gas solenoid valve is de-energized and normally open, and the water pump module is driven to operate in a preset low-speed range, so that the large flow of compressed air and the micro-liquid are combined and atomized in front of the mixed fluid output port. In response to a regular water spray command, the two-position three-way solenoid valve is de-energized, the normally closed liquid solenoid valve is energized, and the normally open gas solenoid valve is energized and closed. The pump module is then driven to operate in a preset high-speed range, so that pure liquid is output from the mixed fluid output port.

[0011] Optionally, the handheld multi-functional spray gun has a fluid channel switching structure linked to the mode selection switch, which opens only the pure air channel in the pure blowing mode and only the mixing channel in the micro water atomization mode and the regular water spray mode.

[0012] Optionally, the microprocessor is also electrically connected to a pressure sensor installed on the gas storage tank; under the micro-water atomization command, the microprocessor dynamically adjusts the drive PWM duty cycle of the water pump module according to the real-time pressure value fed back by the pressure sensor, reducing the duty cycle when the pressure decreases and increasing the duty cycle when the pressure increases, so that the gas-liquid mixing ratio remains constant within the tank pressure fluctuation range.

[0013] Optionally, a premixing chamber is provided at the front end of the mixed fluid output port. The premixing chamber is a tubular cavity with an internal conical contraction section. The outlet of the normally open gas solenoid valve, the second outlet of the two-position three-way solenoid valve, and the liquid outlet of the normally closed liquid solenoid valve are all connected to the premixing chamber through independent one-way valves (CV1, CV2, CL1). The outlet of the premixing chamber is connected to a mixing enhancement pipeline, and the inner wall of the pipeline is integrally formed with multiple continuous spiral guiding ridges.

[0014] Secondly, a control method for operating the aforementioned DC brushless cleaning machine is also provided, comprising: Receive mode commands input by the user via the spray gun; When the system is identified as pure air blowing mode, disconnect the power supply to the two-position three-way solenoid valve and the normally closed liquid solenoid valve, connect the power supply to the normally open gas solenoid valve to close it, and stop the water pump to output compressed air from the pure air port. When the micro-water atomization mode is identified, the power supply to the two-position three-way solenoid valve and the normally closed liquid solenoid valve is turned on, the normally open gas solenoid valve is de-energized, and the water pump is driven to run at low speed to lead the gas and liquid phases to the mixing port for atomization. When the system is identified as a regular water spray mode, disconnect the two-position three-way solenoid valve, connect the normally closed liquid solenoid valve and the normally open gas solenoid valve to shut them off, drive the water pump to run at high speed, and pump the pure liquid to the mixing port for output.

[0015] The technical solutions provided by the embodiments of this application may include the following beneficial effects: This invention proposes a "two-position, three-way, normally open, normally closed" hard-logic solenoid valve assembly architecture, replacing the complex pilot valve assembly or manually switching valves in traditional solutions. This architecture utilizes the physical properties of the two-position, three-way valve to achieve absolute interlocking between "pure blowing" and "atomization / spraying" in the gas path, physically eliminating the possibility of high-pressure gas accidentally flowing directly to the pure gas outlet in liquid mode or gas flow entering the liquid path in pure gas mode. This simple, reliable, and cost-effective design provides a solid foundation for the long-term trouble-free operation of the equipment.

[0016] This invention achieves true "one-click intelligent selection" and "condition-adaptive" control. The microprocessor doesn't simply switch pumps and valves on and off; instead, it performs deep, coordinated control of up to five actuators based on the selected mode. By dynamically compensating the water pump's PWM duty cycle based on real-time pressure feedback from the air tank, it ensures a constant air-liquid ratio and fineness for each spray of foam and water mist across the entire range of air tank pressure fluctuations. This completely solves the problem of inconsistent performance caused by unstable pressure in traditional pneumatic sprayers.

[0017] The premixing chamber and mixing enhancement tube design of this invention provide structural assurance for low-pressure atomization. Under pressure conditions far lower than those of a high-pressure pump, the conical acceleration section and spiral guide structure force the gas-liquid mixture to undergo intense mixing and shearing within the tube, achieving atomization with finer particle size, higher uniformity, and greater kinetic energy. This "low-pressure, high-quality" atomization mode, in principle, completely eliminates the possibility of physical damage to the surface of the object being cleaned and enables environmentally friendly cleaning with zero direct discharge of wastewater using minimal water consumption.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is an internal principle block diagram of a DC brushless cleaning machine according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the principle structure of the fluid logic distribution valve group according to an embodiment of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of a DC brushless cleaning machine according to an embodiment of the present invention.

[0023] The attached figures are labeled as follows: 1. DC brushless air compressor module; 2. High-pressure pipe; 3. Check valve; 4. Air tank; 5. Conversion bracket; 6. Manual ball valve; 7. Main air supply line; 8. Fluid logic distribution valve group; 9. Filter; 10. Water tank; 11. DC brushless water pump module; 12. High-frequency electronic water flow switch; 13. Handheld multi-functional spray gun; 14. Housing; 15. Wheels. Detailed Implementation

[0024] 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 numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application.

[0025] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used herein are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0026] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0027] like Figures 1 to 3 As shown, this embodiment provides a DC brushless cleaning machine, which includes a housing, a power module, a control module, a fluid logic distribution valve group, a handheld multi-functional spray gun 13, and a multi-modal control circuit board. The following is a detailed description of each of these components.

[0028] In one embodiment, the housing 14 can be a portable housing 14 made of engineering plastic and equipped with wheels 15 at the bottom. The interior of the housing 14 is divided into a power compartment and a working compartment according to their functions. The power compartment is used to install all components that generate vibration, heat and may generate trace amounts of water vapor; the working compartment is used to house precision electronic components and fluid control components.

[0029] Inside the power compartment is the integrated power source module, which houses the core of the entire system. This integrated power source module includes: The DC brushless air compressor module 1 is a small single-cylinder reciprocating air compressor directly driven by a 48V DC permanent magnet brushless motor. The motor driver receives PWM signals from the control board, enabling stepless smooth adjustment of the speed from several hundred revolutions per minute to the rated speed.

[0030] An air storage tank 4 has its inlet connected to the compressor outlet via a high-pressure pipe 2 and a one-way valve 3. The one-way valve 3 allows airflow to enter the air storage tank 4 in only one direction. A high-precision industrial-grade pressure sensor is fixedly installed on the tank body of the air storage tank 4, and its signal line is connected to the control circuit board in the working chamber to provide real-time feedback on the pressure value inside the tank. The outlet of the air storage tank 4 is connected to a conversion bracket 5, which is equipped with a manual ball valve 6 as a reserved quick interface for auxiliary air supply, allowing connection of external equipment such as pneumatic wrenches and blow guns. A main air supply pipeline 7 extends from the front end of the conversion bracket 5 and directly enters the upper working chamber to supply air to the entire fluid logic system.

[0031] The DC brushless water pump module 11 also uses a 48V DC brushless motor to drive a three-chamber diaphragm pump head. Its inlet is connected to the bottom outlet of a detachable water tank 10 via a hose and a high-precision liquid filter 9. A high-frequency electronic water flow switch 12 is connected in series in the pipeline after the outlet of the DC brushless water pump module 11 to detect the presence of liquid flow in real time. This switch uses the Hall effect principle; when water flow drives the internal turbine to rotate, it outputs a pulse signal with a frequency proportional to the water flow rate to the control board.

[0032] The water tank 10 adopts a split quick-release buckle structure, which can be easily removed for adding water or cleaning. A liquid delivery pipe is led out from the outlet of the DC brushless water pump module 11 and enters the working chamber.

[0033] The fluid logic distribution valve group 8 is the physical core of this invention for achieving seamless mode switching. For example... Figure 2 The detailed illustration shows that the fluid logic distribution valve group 8, which is fixed in the working chamber, is machined from an integrated aluminum alloy valve block, on which three core solenoid valves are inserted.

[0034] The external interfaces of the fluid logic distribution valve group 8 include: a high-pressure gas input port (connected to the main gas supply line 7), a liquid input port (connected downstream of the water flow switch), a pure gas output port (connected to the pure gas connector of the handheld spray gun via a pure gas pipe), and a mixed fluid output port (connected to the mixed liquid connector of the handheld spray gun via a mixing enhancement pipe).

[0035] The internal structure of the fluid logic distribution valve assembly 8 includes the following components: A two-position three-way solenoid valve V1, which is the core gas distributor, has its inlet P connected to the high-pressure gas input port. Its normally closed working port A (first outlet) is directly connected to the pure gas output port. Its normally open working port B (second outlet) is led through an internal flow channel to the inlet of a one-way valve CV1, and then enters the confluence area at the front end of the premixing chamber.

[0036] A normally open gas solenoid valve S1 has its inlet end connected to the high-pressure gas input port, and its outlet end is led to the inlet of another one-way valve CV2 through an internal flow channel, and finally merges into the confluence area at the front end of the premixing chamber.

[0037] A normally closed liquid solenoid valve S2 has its inlet end connected to the liquid input port and its outlet end directly entering the premixing chamber.

[0038] Three one-way valves, CV1, CV2, and CL1, are used to prevent airflow or water vapor from flowing back to V1 and S1 under any operating conditions. CL1 is connected in series after the liquid outlet of S2 to prevent high-pressure gas from flowing back into the liquid pipeline at the moment of atomization.

[0039] This layout creates a hard logic interlock: when V1 is de-energized, high-pressure gas only flows to the pure gas output port, and because port B of V1 is cut off, there is no high-pressure source in the premixing chamber's gas path; when V1 is energized, the high-pressure gas is switched to port B to enter the premixing chamber, while port A is cut off, and there is no pure gas output. This ensures that there is exactly one open path in the gas path at any given time.

[0040] The handheld multi-functional spray gun 13 is connected to the main unit via an integrated cable. This cable integrates a pure air tube, a mixing enhancement tube, and a three-core signal line for a mode selection switch. A single-lever three-position selector switch, S_Mode, is located on the spray gun body, providing the user with a unique operating interface. This switch has three physical positions: "A - Pure Air Blowing," "B - Micro-water Atomization," and "C - Regular Spraying." The contact position signal is transmitted along the signal line to the main unit's control circuit board.

[0041] The multimodal control circuit board is the control center of the device, and its core is a 32-bit ARM microprocessor MCU501. The MCU501's input channels receive: The on / off status signal of the mode selection switch S_Mode.

[0042] The analog voltage signal from the barometric pressure sensor is converted into a digital signal by the built-in ADC.

[0043] The pulse frequency of the electronic water flow switch.

[0044] The output channels of the MCU501 can be independently controlled via MOSFET or relay drivers: The coil of the two-position three-way solenoid valve V1 is energized and de-energized.

[0045] The coil of the normally open gas solenoid valve S1 is energized and de-energized.

[0046] The coil of the normally closed liquid solenoid valve S2 is energized and de-energized.

[0047] The motor driver of DC brushless air compressor module 1 (provides PWM speed commands with a duty cycle of 0-100%).

[0048] The motor driver of the DC brushless water pump module 11 (provides PWM speed commands with a duty cycle of 0-100%).

[0049] Before the mixed fluid output port, a premixing chamber for primary atomization is provided. The premixing chamber is designed as a tapered constriction tube with a large inlet cross-sectional area, receiving fluids from the gas-path check valves CV1 and CV2 and the liquid-path check valve CL1. The inner diameter then tapers to a neck. When a large flow of compressed air carrying a small amount of liquid passes through this constriction section, the flow velocity is drastically increased, and the velocity difference between the gas and liquid phases reaches its maximum, generating intense shearing and tearing effects, completing the first "explosive" atomization.

[0050] The neck of the premixing chamber is directly connected to the mixing enhancement pipeline. This pipeline is made of polyurethane, and its inner wall is not smooth, but rather integrally molded with several continuous spiral guide ridges with gradually increasing pitch. The high-speed primary atomized flow ejected from the premixing chamber is forced into a high-speed spiral motion under the forced guidance of the ridges, generating strong radial centrifugal force and secondary vortices. Under the action of centrifugal force, the droplets continuously collide with the pipe wall, spread out, and are then torn apart by the airflow, thus completing secondary fine atomization. After these two atomizations, the washing liquid is dispersed into a "controllable dry and wet" particle group with an extremely fine average diameter and extremely uniform distribution when leaving the nozzle.

[0051] The following example, using a complete cleaning operation, details the working process of this embodiment: Mode 1: Pure air blowing mode (cleaning dust in the engine compartment) The user switches the spray gun to position A. After the MCU501 detects the A command: Power off V1 to keep PA constantly open. Connect the high-pressure gas source to the pure gas output port.

[0052] Control S1 to turn it off, thus blocking the high-pressure gas from entering the front end of the mixed fluid output port.

[0053] Control S2 to de-energize and remain closed.

[0054] Water pump 12 is shut down.

[0055] The fluid channel switching structure inside the spray gun, which is linked to the mode selection switch, only opens the pure gas channel.

[0056] The air compressor is started and controlled by PID to maintain the tank pressure at 0.4MPa. When the user pulls the trigger of the spray gun, a stream of high-speed, water-free and oil-free pure compressed air is sprayed out from the pure air nozzle of the spray gun, perfectly blowing away dust from crevices.

[0057] Mode 2: Micro-water atomization mode (full vehicle pre-wash foam spray) The user switches the switch to position B. The MCU501 then enters the precise micro-mist linkage logic: When control valve V1 is energized, the gas path is switched, PB is activated, and high-pressure gas flows through check valve CV1 into the premixing chamber's manifold. Simultaneously, PA is cut off.

[0058] Control S1 is de-energized and remains in the normally open state. A second, powerful airflow simultaneously enters the premixing chamber's confluence zone through the one-way valve CV2, and the two airflows merge to form the total atomizing gas source.

[0059] When S2 is energized, the liquid circuit is opened.

[0060] Read the real-time pressure value P_now from the barometric pressure sensor.

[0061] The "follow-up" water pump speed control algorithm is executed: Using a preset ideal gas-liquid mixing ratio as the target, the required water pump reference speed PWM_Base at the current pressure is calculated by looking up a table or through a function. For example, at a tank pressure of 0.5 MPa, PWM_Base = 15%. Based on this, the MCU501 outputs a PWM signal with a duty cycle of 15% to the water pump driver, causing the water pump to rotate at a low speed of approximately 150 rpm, pumping a small amount of car wash liquid into the premixing chamber at a flow rate of approximately 0.15 L / min.

[0062] The liquid flow is instantly torn apart by high-speed confluenced gas within the conical premixing chamber, forming a dense, creamy foam rich in gas. This foam is then agitated by the spiral of the mixing enhancement tube and finally sprayed out evenly in a fan shape from the nozzle. The foam has extremely low water content, adhering densely to the vehicle surface like a white blanket, softening dirt over a long period. Throughout the process, if movement causes the tank pressure to drop to 0.4 MPa, the reduced gas flow will decrease due to the lower pressure. To maintain a constant gas-liquid mixing ratio, the MCU501 automatically reduces the water pump duty cycle to 13%, ensuring the foam's moisture content remains constant and unaffected by gas source fluctuations.

[0063] Mode 3: Regular water spray mode (washing wheel hubs and residual foam) The user switches the switch to position C. The MCU501 switches to the pure liquid circuit logic: Power is cut off to V1, and PA is restored to normal operation. At this time, the main gas source to the premixing chamber (port B of V1) is physically cut off.

[0064] The control S1 is energized and then automatically shut off. This completely eliminates the possibility of any compressed air entering the premixing chamber via S1 from a redundancy perspective.

[0065] When S2 is energized, the liquid circuit is opened.

[0066] The fluid channel switching structure inside the spray gun, which is linked to the mode selection switch, only opens the mixing channel while closing the pure gas channel.

[0067] A PWM signal with a 90% duty cycle is output to the water pump driver, causing the pump to run at full speed, pumping liquid into the premixing chamber at a flow rate of approximately 2.0 L / min and a certain pressure. Since there is no gas in the premixing chamber and its downstream pipeline at this time, the pure liquid flows smoothly through the mixing pipe and is ejected from the spray gun, forming a gentle yet powerful low-pressure water jet for rinsing. The entire rinsing process uses very little water, is completely controlled, and the ground is only slightly damp, with no visible water flow.

[0068] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only.

[0069] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. A DC brushless cleaning machine, characterized in that, include: chassis; An integrated power source module is located inside the housing. The power module includes a DC brushless air compressor module, an air tank, a DC brushless water pump module, and a water tank connected in sequence. A fluid logic distribution valve assembly, the valve assembly having a high-pressure gas input port, a liquid input port, a pure gas output port and a mixed fluid output port, and internally integrating: A two-position three-way solenoid valve, the inlet of which is connected to the high-pressure gas input port, the first outlet of which is connected to the pure gas output port, and the second outlet of which is connected to the front end of the mixed fluid output port; The two-position three-way solenoid valve is configured such that: when de-energized, the air inlet is connected to the first air outlet and the second air outlet is cut off; when energized, the air inlet is connected to the second air outlet and the first air outlet is cut off. A normally open gas solenoid valve, the inlet end of which is connected to the high-pressure gas input port, and the outlet end of which is connected to the front end of the mixed fluid output port; A normally closed liquid solenoid valve, wherein the inlet end is connected to the liquid input port and the outlet end is connected to the front end of the mixed fluid output port; Handheld multi-functional spray gun; The multi-modal control circuit board integrates a microprocessor. The microprocessor is electrically connected to the mode selection switch on a handheld spray gun, the two-position three-way solenoid valve, the normally open gas solenoid valve, the normally closed liquid solenoid valve, the drive circuit of the air compressor module, and the drive circuit of the water pump module. The microprocessor is configured to independently control the on / off state of each solenoid valve and the motor speed of the air compressor and water pump according to the instructions of the mode selection switch, thereby realizing the automatic switching of at least three working modes.

2. The DC brushless cleaning machine according to claim 1, characterized in that, The gas outlet of the gas storage tank is connected to the high-pressure gas input port, the liquid outlet of the water pump module is connected to the liquid input port, and the pure gas output port and the mixed fluid output port are respectively connected to the pure gas interface and the mixed interface of the handheld multi-functional spray gun.

3. The DC brushless cleaning machine according to claim 1, characterized in that, The microprocessor's preset three operating mode control logics are as follows: In response to the pure air blowing command, the two-position three-way solenoid valve and the normally closed liquid solenoid valve are de-energized, while the normally open gas solenoid valve is energized and closed, and the water pump module is stopped from running. Compressed air is only output from the pure air output port. In response to the micro-water atomization command, the two-position three-way solenoid valve is energized, the normally closed liquid solenoid valve is energized, the normally open gas solenoid valve is de-energized and normally open, and the water pump module is driven to operate in a preset low-speed range, so that the large flow of compressed air and the micro-liquid are combined and atomized in front of the mixed fluid output port. In response to a regular water spray command, the two-position three-way solenoid valve is de-energized, the normally closed liquid solenoid valve is energized, and the normally open gas solenoid valve is energized and closed. The pump module is then driven to operate in a preset high-speed range, so that pure liquid is output from the mixed fluid output port.

4. The DC brushless cleaning machine according to claim 1, characterized in that, The handheld multi-functional spray gun has a fluid channel switching structure that is linked to the mode selection switch. In the pure air blowing mode, only the pure air channel is opened, and in the micro water atomization mode and the regular water spray mode, only the mixing channel is opened.

5. The DC brushless cleaning machine according to claim 3, characterized in that, The microprocessor is also electrically connected to a pressure sensor installed on the gas storage tank. Under the micro-water atomization command, the microprocessor dynamically adjusts the drive PWM duty cycle of the water pump module according to the real-time pressure value fed back by the pressure sensor. The duty cycle is reduced when the pressure decreases and increased when the pressure increases, so that the gas-liquid mixing ratio remains constant within the tank pressure fluctuation range.

6. The DC brushless cleaning machine according to claim 1 or 5, characterized in that, A premixing chamber is provided at the front end of the mixed fluid output port. The premixing chamber is a tubular cavity with an internal conical contraction section. The outlet of the normally open gas solenoid valve, the second outlet of the two-position three-way solenoid valve, and the liquid outlet of the normally closed liquid solenoid valve are all connected to the premixing chamber through independent one-way valves (CV1, CV2, CL1). The outlet of the premixing chamber is connected to a mixing enhancement pipeline. The inner wall of the pipeline is integrally formed with multiple continuous spiral guiding ridges.

7. A control method for operating a DC brushless cleaning machine according to any one of claims 1 to 6, characterized in that, include: Receive mode commands input by the user via the spray gun; When the system is identified as pure air blowing mode, disconnect the power supply to the two-position three-way solenoid valve and the normally closed liquid solenoid valve, connect the power supply to the normally open gas solenoid valve to close it, and stop the water pump to output compressed air from the pure air port. When the micro-water atomization mode is identified, the power supply to the two-position three-way solenoid valve and the normally closed liquid solenoid valve is turned on, the normally open gas solenoid valve is de-energized, and the water pump is driven to run at low speed to lead the gas and liquid phases to the mixing port for atomization. When the system is identified as a regular water spray mode, disconnect the two-position three-way solenoid valve, connect the normally closed liquid solenoid valve and the normally open gas solenoid valve to shut them off, drive the water pump to run at high speed, and pump the pure liquid to the mixing port for output.

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