Spraying system and control method thereof

Abstract

The invention discloses a spraying system and a control method thereof.The spraying system comprises a water flow pipeline, one end of the water flow pipeline is fixedly connected with a washing pump, the other end of the water flow pipeline is fixedly connected with a spraying arm, and a differential pressure sensor is fixedly arranged at the end, close to the spraying arm, of the water flow pipeline; the differential pressure sensor is fixedly arranged on the inner side wall of the water flow pipeline and used for monitoring the pressure difference value of water flow flowing to the spraying arm. The pressure difference sensor is fixedly arranged at the end, close to the spraying arm, of the water flow pipeline, and the water flow pressure difference value before and after rotation of the spraying arm is detected through the pressure difference sensor so as to represent the resistance of the density degree of tableware in the dish washing machine to water flow; therefore, the control system can intelligently regulate and control the operation parameters of the spraying system according to the water flow pressure difference value, the water consumption is reduced while the cleaning effect is ensured, water and energy are saved, and the market competitiveness is improved.

Description

Technical Field

[0001] This invention relates to the field of dishwasher technology, and in particular to a spray system and its control method. Background Technology

[0002] Dishwashers, with their automated operation and efficient cleaning capabilities, have become an essential appliance in modern family kitchens. Their core technology works by using a motor to drive a rotating spray arm, which sprays heated water at high pressure and multiple angles to rinse the dishes. Simultaneously, a special detergent containing bio-enzymes chemically breaks down food residue and grease. Finally, a high-temperature rinsing and hot air drying system cleans, disinfects, and allows for water-free storage of the dishes, all without manual intervention.

[0003] Currently, dishwashers face the following challenges: Firstly, to achieve comprehensive cleaning, most models rely on continuous high-flow spray, resulting in generally high water consumption per run. This contradicts the growing demand for water conservation and environmental protection among households. Secondly, for stubborn grease, dried rice grains, and the backs of deep tableware commonly found in Chinese cuisine, existing water flow paths and pressure designs may still leave cleaning blind spots, causing some users to abandon dishwashers due to unsatisfactory cleaning results. Therefore, significantly reducing water consumption while ensuring or even improving cleaning effectiveness for complex stains and various types of tableware has become a key breakthrough for dishwasher product technology iteration and market penetration. Summary of the Invention

[0004] The embodiments of the present invention provide a spraying system and its control method, which aims to reduce water consumption while ensuring cleaning effect, so as to save water and energy.

[0005] This invention provides a spraying system comprising: A water flow pipe is provided, one end of which is fixedly connected to a washing pump, and the other end of which is fixedly connected to a spray arm. A differential pressure sensor is fixedly installed at the end of the water flow pipe near the spray arm. The differential pressure sensor is fixedly installed on the inner wall of the water flow pipe and is used to monitor the pressure difference of the water flowing towards the spray arm.

[0006] In the spray system provided by the present invention, the differential pressure sensor includes a connection end, one end of which passes through the inner side wall of the water flow pipe through the slot of the water flow pipe and is engaged with the outer side wall of the water flow pipe.

[0007] In the spray system provided by the present invention, the differential pressure sensor includes two connection ends, which are arranged in parallel and spaced apart from each other. Each of the two connection ends is provided with a buckle on both sides facing each other, and the buckle is engaged with the outside of the slot.

[0008] In the spraying system provided by the present invention, a sealing element is fixed between the slot and the connecting end, and the sealing element is used to seal the gap between the slot and the connecting end.

[0009] In the spray system provided by the present invention, the differential pressure sensor is integrally formed with the water flow pipe.

[0010] In the spray system provided by the present invention, the differential pressure sensor is covered with a waterproof shell.

[0011] In the spray system provided by the present invention, the side of the differential pressure sensor facing the inside of the water flow pipe has an arc structure.

[0012] The present invention also provides a control method for a sprinkler system, applied to any of the sprinkler systems described above, comprising: Obtain the execution command and determine whether it is in the pre-washing stage; If it is in the pre-washing stage, the water pressure difference is calculated by detecting the first water flow pressure value before the spray arm rotates and the second water flow pressure value after the spray arm has stabilized and rotated by the differential pressure sensor. The operating parameters of the sprinkler system in the next stage are adjusted according to the water pressure difference and the preset adjustment rules.

[0013] The present invention includes the following steps in adjusting the operating parameters of the sprinkler system in the next stage according to the water flow pressure difference and preset adjustment rules: Calculate the ratio of the water flow pressure difference to the first water flow pressure value; The operating parameters of the spray system in the next stage are adjusted according to the ratio and the preset adjustment rules, wherein the operating parameters include water volume and washing pump speed.

[0014] The present invention includes the following step in adjusting the operating parameters of the spray system in the next stage according to the ratio and a preset adjustment rule: If the ratio is less than or equal to the first threshold, then the water volume in the next stage is reduced by a preset water volume ratio and the washing pump speed is reduced by a preset speed ratio. If the ratio is between the first threshold and the second threshold, the water volume and washing pump speed in the next stage are kept constant. If the ratio is greater than or equal to the second threshold, then the water volume in the next stage is increased by a preset water volume ratio and the washing pump speed is increased by a preset speed ratio.

[0015] This application uses a differential pressure sensor fixed at one end of the water pipe near the spray arm to detect the pressure difference of the water flow before and after the spray arm rotates, thereby characterizing the resistance of the water flow to the density of the dishes inside the dishwasher. This allows the control system to intelligently adjust the operating parameters of the spray system based on the water pressure difference, achieving both cleaning effectiveness and reduced water consumption, thus saving water and energy and improving market competitiveness. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an assembly diagram of the water flow pipe and differential pressure sensor in an embodiment of the present invention; Figures 2a-2b These are partial structural diagrams of the spray system from various perspectives in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the differential pressure sensor in an embodiment of the present invention; Figure 4 This is a flowchart of the control method for the sprinkler system in an embodiment of the present invention; Figure 5 This is a sub-flowchart of the control method for the sprinkler system in an embodiment of the present invention; Figure 6 This is a sub-flowchart of the control method for the sprinkler system in an embodiment of the present invention; Figure 7 This is a flowchart illustrating the steps of the control method for the sprinkler system in an embodiment of the present invention.

[0018] The labels for the attached figures are as follows: 1. Water flow pipe; 2. Differential pressure sensor; 21. Connection end; 211. Buckle; 22. Detection end; 3. Spray arm. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] Reference Figures 1 to 3The diagram illustrates an embodiment of the spray system of the present invention. The spray system includes a water flow pipe 1, one end of which is fixedly connected to a washing pump, and the other end of which is fixedly connected to a spray arm 3. A differential pressure sensor 2 is fixedly mounted on the end of the water flow pipe 1 near the spray arm 3. The differential pressure sensor 2 is fixedly mounted on the inner wall of the water flow pipe 1 and is used to monitor the pressure difference of the water flowing towards the spray arm 3.

[0021] Specifically, the spray system is applied in the home appliance sector, particularly in dishwashers. The spray system is the core functional module for achieving automated and efficient cleaning of tableware. It is a complete device inside the dishwasher responsible for converting washing water into effective cleaning power. The spray system mainly includes a washing pump, water pipe 1, spray arm 3, etc. Among them, the washing pump is the power source and pressure generation core of the spray system. It drives the impeller to rotate through a motor, draws washing water from the bottom of the dishwasher inner tub, pressurizes it, and delivers it to the subsequent water pipe 1.

[0022] The water flow pipe 1 is a closed pipeline network connecting the washing pump, heater, distributor and each spray arm 3. It is the fluid transport channel of the spray system. It is usually made of food-grade plastic or silicone tubing and is responsible for guiding the high-pressure water flow generated by the washing pump to each spray execution terminal in an orderly manner. In this embodiment, the water flow pipe 1 refers to the transport channel connecting the washing pump and the spray arm 3.

[0023] The spray arm 3 is a rotary spray component with an internal flow channel and multiple spray holes at specific angles distributed on its outer surface. It is the core actuator of the spray system. It receives high-pressure water from the water pipe 1 and converts the pressure energy of the water into the kinetic energy of a high-speed water jet through the nozzles on its surface. At the same time, it uses the reaction torque generated by the water exiting the nozzles to drive itself to rotate freely around its central axis with low resistance, thereby achieving dynamic, multi-angle water flow coverage.

[0024] When the dishwasher starts, water will immediately enter the inner tank. After the water is in, the washing pump will start to draw the water from the inner tank to the water pipe 1, and then flow through the pipe to the spray arm 3. The spray arm 3 will start to rotate with the force of the water jet, and the water will clean the dishes under pressure.

[0025] Therefore, the cleaning effect and water / energy saving of a dishwasher are directly related to the operating parameters of the spray system. Currently, the spray system cannot adjust its operating parameters in real time according to the cleaning situation, thus failing to achieve both effective cleaning and water / energy saving. This contradicts users' increasing demands for water conservation and environmental protection, as well as their need for good cleaning results, potentially leading users to abandon its use. Therefore, this application provides an intelligent spray system that offers both effective cleaning and water / energy saving, addressing the problem that current spray systems cannot intelligently adjust their operating parameters based on the actual number of dishes, resulting in effective cleaning but not water / energy saving.

[0026] The spray system in this embodiment includes a water flow pipe 1. One end of the water flow pipe 1 is fixedly connected to a washing pump, and the other end is fixedly connected to a spray arm 3, so that water flow can be guided to the spray arm 3 to clean the tableware outside the spray arm 3. During assembly, the water flow pipe 1 is first fixedly connected to the washing pump, and then the spray arm 3 is assembled to the connection port of the water flow pipe 1.

[0027] A differential pressure sensor 2 is installed at one end of the water flow pipe 1 near the spray arm 3. The differential pressure sensor 2 is fixed on the inner wall of the water flow pipe 1. The differential pressure sensor 2 is used to accurately detect the difference between the first water flow pressure value of the water flowing towards the spray arm 3 before the spray arm 3 is not rotated and the second water flow pressure value of the water flowing towards the spray arm 3 when the spray arm 3 is rotating stably (meaning that the water flow is stable after rotating for a period of time). The differential pressure sensor 2 is a key intelligent sensing element. By continuously monitoring the pressure difference between the water flow pressure values ​​of the spray arm 3 before and after rotation, it characterizes the resistance of the density of the dishes in the dishwasher to the water flow. This allows the control system of the spray system to dynamically adjust its operating parameters according to the water flow pressure difference. The operating parameters may refer to the washing pump speed, water volume, water temperature, spray arm 3 speed, spray angle, spray time, etc. of the spray system, which are not limited here.

[0028] Furthermore, the differential pressure sensor 2 can be integrated with the motherboard using a quick-connect or integrated interface, further converting the detected values ​​into electrical signals and transmitting them to the motherboard, thereby optimizing the washing pump parameters, increasing washing efficiency, and saving water and energy.

[0029] When the dishwasher is started (this refers to the initial start-up of the dishwasher or the pre-wash stage, which involves rinsing the dishes briefly with room temperature or low temperature water to achieve the first physical rinsing and remove large food residues), the spray system is activated and operates according to the standard operating parameters set in the preset program. Before the spray arm 3 rotates, the differential pressure sensor 2 first detects and records the first water flow pressure value flowing across its surface. When the spray arm 3 starts to rotate and stabilizes, the differential pressure sensor 2 detects and records the second water flow pressure value flowing across its surface. Then, the differential pressure sensor 2 detects the water flow pressure difference between the first and second water flow pressure values. When the dishwasher enters the next stage (generally the main wash stage, but the specific stage depends on the user's actual operating mode), the control system of the spray system adjusts its operating parameters according to the water flow pressure difference and preset adjustment rules, thereby achieving dynamic energy-saving optimization.

[0030] More specifically, when the accumulation of tableware in the inner cavity increases water flow resistance and raises the pressure difference, the system automatically increases the speed of the washing pump, enhances the water flow pressure, and starts the high-pressure pulse cleaning mode to efficiently decompose stubborn oil stains; while when the pressure difference is maintained within the normal range (indicating that there are few tableware in the inner cavity or that it is empty), the system seamlessly switches to the low water flow spray mode, which ensures the cleaning effect while significantly reducing water consumption and achieving dynamic energy-saving optimization.

[0031] This application uses a differential pressure sensor 2 fixed at one end of the water pipe 1 near the spray arm 3. The differential pressure sensor 2 detects the difference in water pressure before and after the spray arm 3 rotates to characterize the resistance of the dish density in the dishwasher to the water flow. This allows the control system to intelligently adjust the operating parameters of the spray system based on the water pressure difference, thereby ensuring cleaning effect while reducing water consumption, saving water and energy, and improving market competitiveness.

[0032] Furthermore, each spray arm 3 is equipped with an independent differential pressure sensor 2 on the water pipe 1 connected to it. The spray system can independently adjust the operating parameters of each spray arm 3 according to the water pressure difference detected by each differential pressure sensor 2, thereby accurately matching the spray position of each spray arm 3, further improving the cleaning effect and saving water and energy.

[0033] In one embodiment, reference is made to Figure 1 and Figure 3As shown, the differential pressure sensor 2 includes a connecting end 21. One end of the connecting end 21 passes through the slot of the water flow pipe 1 through the inner wall of the water flow pipe 1 and is snapped into the outer wall of the water flow pipe 1. Specifically, there are various ways to fix the differential pressure sensor 2 to the water flow pipe 1, including but not limited to bonding, snapping, and injection molding. In this embodiment, the water flow pipe 1 and the differential pressure sensor 2 are mainly fixedly connected by snapping. The differential pressure sensor 2 includes a detection end 22 and a connecting end 21. The detection end 22 is used to detect the pressure difference of the water flowing through it. The detection end 22 is located inside the water flow pipe 1, that is, the detection end 22 is located inside the inner wall of the water flow pipe 1. The connecting end 21 is used to fix the differential pressure sensor 2 and the water flow pipe 1. One end of the connecting end 21 is fixedly connected to the detection end 22, and the other end of the connecting end 21 extends outward away from the detection end 22, thereby facilitating installation on the water flow pipe 1.

[0034] The water flow pipe 1 has a slot at the location where the differential pressure sensor 2 is installed. The slot connects the inner and outer sides of the water flow pipe 1, and the size of the slot is adapted to the connecting end 21. The slot is used to avoid the connecting end 21, so that the connecting end 21 can pass through the slot from the inner side of the water flow pipe 1 and extend to the outer side of the water flow pipe 1. Then, one end of the connecting end 21 is engaged with the outer wall of the water flow pipe 1, thereby making the connection between the differential pressure sensor 2 and the water flow pipe 1 located on the outer side of the water flow pipe 1, avoiding the differential pressure sensor 2 from affecting the water flow in the water flow pipe 1; at the same time, it improves the fixing strength between the differential pressure sensor 2 and the water flow pipe 1.

[0035] In a specific embodiment, refer to Figure 1 and Figure 3 As shown, the differential pressure sensor 2 includes two connecting ends 21, which are parallel and spaced apart. Each of the two connecting ends 21 has a latch 211 on both sides facing each other, and the latches 211 are engaged with the outside of the slots. Specifically, the differential pressure sensor 2 is fixedly connected to the water flow pipe 1 by a snap-fit ​​connection. The differential pressure sensor 2 includes two connecting ends 21, one end of which is fixedly connected to both sides of the detection end 22. The connecting ends 21 extend horizontally, meaning they are parallel and spaced apart. Each connecting end 21 is engaged with one of the two slots of the water flow pipe 1, thereby improving the fixing strength between the differential pressure sensor 2 and the water flow pipe 1.

[0036] More specifically, buckles 211 are provided on both sides of the two connecting ends 21 facing each other. That is, buckles 211 are provided on the inner side of the two connecting ends 21, and the two buckles 211 extend towards each other. The buckles 211 are locked on the outer side of the slot, so that both sides of the two connecting ends 21 facing each other are locked on the outer side of the slot, thereby further improving the fixing strength of the differential pressure sensor 2 and the water flow pipe 1 and avoiding the phenomenon of the differential pressure sensor 2 shaking or unstable connection in the water flow pipe 1.

[0037] In a specific embodiment, a sealing element (not shown in the figure) is fixed between the slot and the connecting end 21. The sealing element is used to seal the gap between the slot and the connecting end 21. Specifically, since the water pipe 1 is a flow channel for washing water or clean water, it is necessary to ensure the sealing performance of the water pipe 1. However, when the water pipe 1 and the differential pressure sensor 2 are installed, a slot needs to be made in the water pipe 1 at the installation position (at this time, the water pipe 1 does not have a sealing performance). When one end of the connecting end 21 passes through the slot and is engaged with the outside of the slot, a gap will be generated between the connecting end 21 and the slot. In order to avoid the gap affecting the sealing performance of the water flow channel, causing clean water or washing water to leak to the outside of the water pipe 1 and affecting the safety of the dishwasher, a sealing element is fixed between the slot and the connecting end 21. The sealing element has a waterproof sealing function, thereby sealing the gap between the slot and the connecting end 21.

[0038] The sealing element can be any structural component with waterproof and sealing functions, such as sealant, sealing tape, etc., which is not limited here. In this embodiment, the gap is mainly sealed by applying glue to improve production efficiency.

[0039] In a specific embodiment, the differential pressure sensor 2 is integrally formed with the water flow pipe 1 (not shown in the figure). Specifically, the differential pressure sensor 2 can be either a separate structural component from the water flow pipe 1 (i.e., the differential pressure sensor 2 can be fixedly installed on the inner wall of the water flow pipe 1 by means of bonding, snap-fit, etc.) or integrally formed with the water flow pipe 1. In this embodiment, the water flow pipe 1 and the differential pressure sensor 2 are produced by injection molding to improve the structural strength of the differential pressure sensor 2 and the water flow pipe 1, reduce the probability of the differential pressure sensor 2 being washed away by the water flow, increase the service life of the spray system, and reduce production costs.

[0040] In one embodiment, a waterproof housing (not shown in the figure) is fitted over the outside of the differential pressure sensor 2. Specifically, the waterproof housing serves to seal and waterproof the differential pressure sensor 2, thereby protecting it from water flow and preventing it from affecting the internal circuitry and safety of the sensor, thus improving the safety of the sprinkler system.

[0041] The differential pressure sensor 2, which is fitted with the waterproof shell, is integrated on the inner wall of the water flow pipe 1 to improve the structural strength of the spray system.

[0042] In a specific embodiment, refer to Figure 1 and Figure 3 As shown, the differential pressure sensor 2 has an arc-shaped side facing the inside of the water flow pipe 1. Specifically, since the detection end 22 of the differential pressure sensor 2 is located inside the water flow pipe 1, and the differential pressure sensor 2 protrudes from the inner wall of the water flow pipe 1, it detects the water pressure value passing over its surface. Therefore, driven by the washing pump, the water flows from the dishwasher tub through the water flow pipe 1 to the spray arm 3, and then sprays onto the dishes to clean them. However, when the water flows through the water flow pipe 1, it passes through the differential pressure sensor 2, which creates resistance to the water flow, thereby increasing the energy consumption of the spray system. In this embodiment, the side of the differential pressure sensor 2 facing the inside of the water flow pipe 1 is set as an arc-shaped structure. The smooth surface of the arc-shaped structure reduces the resistance of the differential pressure sensor 2 to the water flow, thereby reducing the energy consumption of the spray system and achieving an energy-saving effect.

[0043] This invention also provides a control method for a sprinkler system. Figure 7 This is the overall flow diagram of the spray system, where Figure 4 This is a flowchart illustrating the control method for the sprinkler system. The control method is applied to any of the sprinkler systems described above, and the steps of the control method include S10-S30: S10. Obtain the running instruction and determine whether it is in the pre-washing stage; In this embodiment, the spray system is the core cleaning component of the dishwasher. It is a system that cleans tableware by driving the spray arm 3 to spray water. Its operating status directly affects the cleaning effect and water-saving performance. The spray system in this embodiment is any of the spray systems described above. The operating command is usually selected by the user through the operation interface (which can be the dishwasher's operation interface or a terminal APP, such as buttons, knobs, or touch screens) or automatically triggered by a preset program. Essentially, it is a start signal that includes the target cleaning mode (such as standard wash, heavy wash, energy-saving wash, etc.) and possible additional parameters (such as water temperature, duration). The pre-wash stage is the initial stage of the dishwasher cleaning process. It specifically refers to a preliminary rinsing step before the main cleaning cycle begins. Its main function is not to thoroughly clean, but to use water flow to initially rinse the surface of the items to be cleaned to remove most of the loose residue and large particles of dirt, creating favorable conditions for subsequent deep cleaning, and preventing dirt from clogging the filter or pipes in the early stage of the cycle.

[0044] During implementation, when the dishwasher control system is in standby mode, it continuously monitors whether it receives operating instructions. It captures user operation or linkage trigger instruction signals in real time through the built-in signal receiving module of the device, and parses the instruction content to extract the cleaning program parameters contained therein.

[0045] After parsing, the control system's startup phase judgment logic calls the pre-stored cleaning process phase division rules (i.e., different cleaning modes correspond to different cleaning process phases) and matches the program type corresponding to the currently received running instruction with the triggering conditions of the pre-washing phase. If the matching result meets the startup conditions of the pre-washing phase, it is determined that the current process needs to enter the pre-washing phase, providing a basis for the parameter configuration of the subsequent spray system pre-washing mode. If no match is found, it is determined to be another cleaning phase according to the corresponding program type.

[0046] The control method of the spray system described in this application mainly uses the water pressure difference during the pre-wash stage to characterize the density of tableware, and then adjusts the operating parameters of the next stage according to preset adjustment rules and pressure difference to achieve the technical goals of water and energy saving and good cleaning effect. This embodiment first determines the operating stage of the spray system to ensure that the pressure difference detected subsequently is the same as that of the pre-wash stage. This allows the spray system to adjust the operating parameters of the next stage in a timely and precise manner based on the actual number of tableware, thus optimizing the overall cleaning efficiency and resource utilization of the spray system.

[0047] S20. If it is in the pre-washing stage, the water pressure difference is calculated by detecting the first water pressure value before the spray arm 3 rotates and the second water pressure value after the spray arm 3 rotates stably through the differential pressure sensor 2. In this embodiment, the differential pressure sensor 2 is used to accurately detect the pressure difference between the first water flow pressure value of the spray arm 3 before it rotates and the second water flow pressure value of the spray arm 3 when it rotates stably (meaning the water flow remains stable after a period of rotation). The differential pressure sensor 2 is a key intelligent sensing element that continuously monitors the pressure difference between the water flow pressure values ​​of the spray arm 3 before and after rotation, thereby characterizing the resistance of the density of tableware in the dishwasher to the water flow. The differential pressure sensor 2 is pre-integrated into the water supply pipe (i.e., water pipe 1) inside the dishwasher cavity, and its measuring point is located on the pipe section near the water inlet of the spray arm 3 to accurately measure the water flow pressure to the spray arm 3.

[0048] The first water flow pressure value is the pressure value of the water flow in the spray system when the spray arm 3 is not rotating and is in a static or initial flow state, reflecting the initial water pressure benchmark for pre-washing. The second water flow pressure value is the pressure value of the water flow in the spray system when the spray arm 3 has started and reached a stable rotating state, reflecting the water pressure conditions during normal operation of the spray arm 3. The water flow pressure difference is the difference between the first water flow pressure value and the second water flow pressure value, which can reflect the impact of the operation of the spray arm 3 on the system water pressure and the water flow state, so as to characterize the resistance of the water flow to the density of the tableware in the dishwasher.

[0049] In practice, when the system determines that it is in the pre-wash stage, it first starts the washing pump, but temporarily suppresses the rotation of the spray arm 3 through control logic, keeping it stationary. At this time, water begins to fill the water pipe 1 and flows to the stationary spray arm 3. The differential pressure sensor 2 then starts high-frequency sampling to continuously monitor the pipeline pressure. When the system detects that the pressure signal output by the differential pressure sensor 2 tends to stabilize, that is, the fluctuation value falls within the preset threshold range, the control system records and stores this steady-state pressure value as the first water flow pressure value. This value accurately represents the initial static pressure reference established in the system when the spray arm 3 has not yet rotated.

[0050] Subsequently, the control system releases the rotation inhibition on the spray arm 3, allowing it to begin rotating under the reaction force of the jet water flow. The system continuously monitors the rotational speed of the spray arm 3, and once its speed reaches a preset value (i.e., the preset rotational speed value of the spray arm 3 during the pre-washing stage) and is maintained for a set period of time, it confirms that it has entered a stable rotational state—that is, the rotational state and the hydrodynamic state are both in equilibrium. Under this new steady state, the differential pressure sensor 2 performs high-precision measurement again and transmits the new stable pressure signal to the control system. The control system records this value as the second water flow pressure value, which reflects the actual system pressure condition of the spray arm 3 during stable operation.

[0051] Finally, the system's embedded algorithm module retrieves the two characteristic pressure values ​​in real time, performs a subtraction operation, and defines the calculation result as the water flow pressure difference. The generation and calculation of this difference fully characterizes the system pressure response change from "static flow resistance" to "dynamic flow resistance," providing direct quantitative input for subsequent intelligent judgment and control. The entire data acquisition, transmission, and processing process is executed automatically and continuously under program control.

[0052] In this embodiment, the pressure difference detected by the differential pressure sensor 2 is used to characterize the resistance of the water flow to the density of the tableware inside the dishwasher, so as to accurately identify the usage scenario of the spray arm 3 and provide a precise basis for adjusting the operating parameters in the next step.

[0053] S30. Adjust the operating parameters of the sprinkler system in the next stage according to the water flow pressure difference and the preset adjustment rules; In this embodiment, the preset adjustment rules are pre-set in the control system, and are a set of rules that match the corresponding operating parameter adjustment schemes according to the water pressure difference range, clarifying the parameter optimization logic under different resistance conditions. The next stage refers to the subsequent cleaning stages such as the main wash and rinsing after the pre-wash stage. The specific next stage is selected according to the actual mode. The operating parameters of the spray system directly affect the cleaning effect and water-saving performance. In this embodiment, the next stage refers to the main wash stage. The operating parameters are the core working parameters of the spray system, including spray water pressure, spray arm speed, water temperature, and washing time.

[0054] In practice, the control system's built-in processing unit uses the real-time calculated water pressure difference as a key input variable. The system then accesses its stored preset adjustment rules and determines specific parameter adjustment instructions that match the current water pressure difference. For example, the rules might specify that if the difference is in a higher range, the washing pump speed should be increased, the washing time extended, and the water volume increased accordingly.

[0055] Subsequently, the control unit generates corresponding modulation signals and sends them to each actuator (such as the wash pump motor driver, heater relay, etc.). Based on the received instructions, these actuators precisely adjust their outputs so that when the next stage of the program starts, the entire spray system operates according to the new, optimized set of operating parameters.

[0056] In this embodiment, the entire adjustment process is completed automatically during the transition between stages, realizing closed-loop intelligent control based on the feedback of the preceding stage's operating conditions. This allows the operating parameters of the next stage to be intelligently adjusted according to the actual density of tableware, ensuring that the subsequent cleaning stages can be accurately adapted to the actual operating conditions, thus achieving water and energy conservation while ensuring the cleaning effect.

[0057] Furthermore, each spray arm 3 is equipped with an independent differential pressure sensor 2 on the water pipe 1 connected to it. The spray system can independently adjust the operating parameters of each spray arm 3 according to the water pressure difference detected by each differential pressure sensor 2, thereby accurately matching the spray position of each spray arm 3, further improving the cleaning effect and saving water and energy.

[0058] In one embodiment, such as Figure 5 As shown, step S30 further includes steps S31-S32.

[0059] S31. Calculate the ratio of the water flow pressure difference to the first water flow pressure value; S32. Adjust the operating parameters of the spray system in the next stage according to the ratio and the preset adjustment rules, wherein the operating parameters include water volume and washing pump speed; In this embodiment, the ratio (i.e., the fluctuation value) refers to the calculated result of the water flow pressure difference and the first water flow pressure value. It is used to quantify the proportion of water flow resistance relative to the initial water pressure, effectively eliminating the influence of absolute pressure level differences. Instead, it purely and sensitively reflects the relative pressure fluctuation amplitude caused by changes in the internal flow resistance of the spray system (mainly caused by changes in the rotation state of the spray arm 3 and the load conditions inside the cavity), and more accurately reflects the tableware load conditions. The operating parameters specifically refer to the water volume (water supply of the spray system) and washing pump speed (operating speed of the pump body driving the water flow circulation) for the next stage of cleaning, which directly affect the cleaning intensity and water-saving effect.

[0060] During implementation, after the control system calculates the water pressure difference during the pre-wash stage, it initiates the ratio calculation process. First, it retrieves the pre-stored first water pressure value. Then, it substitutes the previously obtained water pressure difference value and the first water pressure value into a preset calculation formula to calculate their ratio. This ratio quantifies the proportion of water flow resistance relative to the initial water pressure, thus more accurately defining the load condition corresponding to the current density of tableware. The specific calculation formula is as follows: ; Where A represents the ratio, This indicates the second water flow pressure value. This indicates the pressure value of the first water flow.

[0061] Subsequently, the system retrieves the built-in preset adjustment rules and matches the calculated ratios with the multiple ratio intervals defined in the rules one by one to determine the load condition of the current operating state. Based on the matching results, the rules output the corresponding adjustment plan for the next stage of operating parameters, specifying the specific adjustment range of water volume (such as increasing or decreasing water supply) and the appropriate value of the washing pump speed (such as increasing or decreasing the speed).

[0062] Once the parameters are determined, the control system generates corresponding adjustment commands and sends them to the water volume control component and the washing pump drive component to complete the precise configuration of water volume and washing pump speed in the next stage, ensuring that the operating parameters are adapted to the actual tableware load conditions and achieving a balance between cleaning effect and water-saving performance.

[0063] After acquiring the water flow pressure difference during the pre-wash stage, the spray system in this embodiment immediately executes a more refined, ratio-based parameter calculation and adjustment process. The core of this process lies in dynamically and precisely setting the key operating parameters for the upcoming next cleaning stage (e.g., the main wash stage) based on a predefined adjustment rule stored in the control system. These adjustments take effect simultaneously when the next stage program starts, thereby achieving a targeted, closed-loop adaptive operating parameter optimization based on real-time feedback from the preceding stage, aiming to improve cleaning effectiveness and energy efficiency.

[0064] In one embodiment, such as Figure 6 As shown, step S32 further includes steps S321-S323.

[0065] S321. If the ratio is less than or equal to the first threshold, then control the water volume in the next stage to decrease by a preset water volume ratio and the washing pump speed to decrease by a preset speed ratio. S322. If the ratio is between the first threshold and the second threshold, the water volume and washing pump speed in the next stage are kept constant. S323. If the ratio is greater than or equal to the second threshold, then control the water volume to increase by a preset water volume ratio and the washing pump speed to increase by a preset speed ratio in the next stage.

[0066] Specifically, the first threshold and the second threshold are critical values ​​for dividing the ratio interval in the preset adjustment rules. The first threshold is a lower limit benchmark with a smaller value, and the second threshold is an upper limit benchmark with a larger value. The first threshold is less than the second threshold and is used to define different tableware load conditions (e.g., low load, medium load, high load). These two thresholds are empirical or calculated values ​​obtained through prior testing and data calibration of a large number of typical loads (representing different tableware density and placement states). They divide the continuous numerical range of the pressure ratio into three intervals with clear control significance. In this embodiment, the first threshold is 20%, and the second threshold is 70%.

[0067] The preset water volume ratio is a pre-set water volume adjustment range, including a fixed ratio of decreasing or increasing, used to adapt to the water supply requirements of different load conditions. The preset speed ratio is a pre-set washing pump speed adjustment range, including a fixed ratio of decreasing or increasing, to match the water volume adjustment to ensure spray intensity.

[0068] During implementation, after the control system completes the ratio calculation, it retrieves the preset first threshold and second threshold, and initiates the ratio interval matching process. The system compares the current ratio with the first threshold and the second threshold respectively to determine the corresponding operating condition interval.

[0069] If the ratio is less than or equal to the first threshold, it indicates that the change in system flow resistance reflected by the pressure difference is relatively weak, indirectly suggesting that the amount of tableware loaded in the dishwasher cavity is small or that the placement of the tableware has little obstruction to water flow (it is in a low-load state). At this time, according to the preset adjustment rules, the control system will generate an instruction to lower the operating parameters for the next stage (such as the main wash stage). Specifically, the instruction is to reduce the planned water volume for the next stage by a preset water volume percentage (e.g., 10%) based on the base water volume; at the same time, the washing pump speed driving the water flow will be reduced by a preset speed percentage (e.g., 20%) based on its base speed setting. This strategy aims to proactively save water resources and reduce energy consumption when the load is light, achieving refined operation.

[0070] Secondly, if the ratio is neither less than or equal to the first threshold nor greater than or equal to the second threshold, meaning its value lies between the first and second thresholds, it indicates that the system flow resistance is at a typical, expected, moderate level, corresponding to a normal tableware loading condition (medium load). Under this condition, the preset adjustment rule determines that no parameter adjustment is required. Therefore, the control system will maintain the original parameter settings, meaning that the water volume and washing pump speed in the next stage will remain unchanged, operating according to the standard or default program.

[0071] Finally, when the system determines that the ratio is greater than or equal to the second threshold, it indicates that the dynamic flow resistance reflected by the pressure difference has increased significantly, indirectly suggesting that the high density or arrangement of tableware inside the machine strongly hinders the water flow. To address this situation and ensure cleaning effectiveness, the control system generates parameter adjustment commands according to rules. Specifically, it increases the water volume in the next stage by a preset percentage (e.g., 10%) to ensure sufficient cleaning medium coverage and dirt removal; simultaneously, it increases the washing pump speed by a preset percentage (e.g., 20%) to increase water pressure and flushing force, overcome resistance, and achieve better cleaning results.

[0072] For example, refer to Figure 7As shown, when the detected water pressure difference increases by 70%, it indicates that the dishes are densely packed, the jet resistance is greater, and the water pressure difference is larger. At this time, the washing pump speed in the next stage increases by 20%, and the water volume is also increased by 10% to prevent the washing pump from running dry due to insufficient water volume. When the detected water pressure difference increases by only 20% or less, the washing pump speed in the next stage decreases by 20%, and less water is required. In this case, the water intake can be reduced by 10% in the next stage. Overall, high-efficiency washing is achieved, which can ensure that the dishes are clean while reducing water and energy consumption. When the detected increase in water pressure difference is between 20% and 70%, the operating parameters in the next stage remain unchanged.

[0073] This application integrates a miniature differential pressure sensor 2 into the water outlet of the spray arm 3, achieving an integrated design between the sensor and the spray arm 3. The control method of the spray system intelligently adjusts the cleaning mode by monitoring the pressure difference before and after the water flows through the spray arm 3 in real time: when the accumulation of tableware in the inner cavity increases the water flow resistance and the pressure difference, the system automatically increases the speed of the washing pump and the water volume, enhances the water flow pressure, and starts the high-pressure pulse cleaning mode to efficiently decompose stubborn oil stains; when the pressure difference is within the normal range, the operating parameters remain unchanged; and when the pressure difference is in a low range (indicating that there are few tableware in the inner cavity or that it is empty), the system seamlessly switches to a low water flow spray mode (reducing the speed of the washing pump and the water volume), which ensures the cleaning effect while significantly reducing water consumption and achieving dynamic energy-saving optimization.

[0074] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A sprinkler system characterized in that, The utility model relates to a kind of spray system and method, comprising: Water flow pipeline, one end of the water flow pipeline is fixedly connected with washing pump, the other end of the water flow pipeline is fixedly connected with spray arm, the one end of the water flow pipeline is fixed with differential pressure sensor close to the spray arm, the differential pressure sensor is fixed in the inner side wall of the water flow pipeline, for monitoring the water flow pressure difference value of flow to the spray arm.

2. The sprinkler system according to claim 1, wherein The differential pressure sensor includes a connection end, one end of the connection end is passed through the slot of the water flow pipeline by the inner side wall of the water flow pipeline, and is clamped with the outer side wall of the water flow pipeline.

3. The shower system of claim 2, wherein, The differential pressure sensor includes two connection ends, the two connection ends are parallel and oppositely spaced, and the two sides of the two connection ends are provided with buckles, and the buckles are clamped outside the slot.

4. The shower system of claim 2, wherein, A sealing element is fixed between the slot and the connection end, and the sealing element is used to seal the gap between the slot and the connection end.

5. The shower system of claim 1, wherein, The differential pressure sensor is integrally formed with the water flow pipeline.

6. The shower system of claim 1, wherein, A waterproof shell is provided outside the differential pressure sensor.

7. The shower system of claim 1, wherein, The side of the differential pressure sensor facing the inside of the water flow pipeline is a circular arc structure.

8. A control method of a sprinkler system, characterized by, The method is applied to the spray system of any one of claims 1-7, and the method comprises: Obtaining an operation instruction to determine whether it is in a pre-washing stage; If it is in a pre-washing stage, a water flow pressure difference value is calculated by detecting a first water flow pressure value before the spray arm rotates and a second water flow pressure value after the spray arm rotates stably through the differential pressure sensor; According to the water flow pressure difference value and a preset adjustment rule, the operation parameters of the spray system in the next stage are adjusted.

9. The method of claim 8, wherein, The step of adjusting the operation parameters of the spray system in the next stage according to the water flow pressure difference value and the preset adjustment rule comprises: Calculating the ratio of the water flow pressure difference value and the first water flow pressure value; According to the ratio and a preset adjustment rule, the operation parameters of the spray system in the next stage are adjusted, wherein the operation parameters include water quantity and washing pump rotating speed.

10. The method of claim 9, wherein, The step of adjusting the operation parameters of the spray system in the next stage according to the ratio and the preset adjustment rule comprises: If the ratio is less than or equal to a first threshold value, the water quantity in the next stage is controlled to decrease by a preset water quantity ratio, and the washing pump rotating speed is controlled to decrease by a preset rotating speed ratio; If the ratio is between the first threshold value and a second threshold value, the water quantity and the washing pump rotating speed in the next stage are kept unchanged; If the ratio is greater than or equal to the second threshold value, the water quantity in the next stage is controlled to increase by a preset water quantity ratio, and the washing pump rotating speed is controlled to increase by a preset rotating speed ratio.

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