Systems, methods, apparatuses, processors, and readable storage medium thereof for implementing a commercial foodservice water purifier and its failure-degraded service control

Abstract

The present application relates to a kind of commercial catering water purifier and its failure degradation water supply control system for achieving, including raw water inlet, public water outlet, main purification branch, backup fine filter branch, detection component and controller, main purification branch includes main branch filter component, booster pump and depth purification component, backup fine filter branch includes the fine filter component being set independently from main branch filter component;Switching valve component has normal position, emergency position, transition position between normal position and emergency position and full closed position;Controller is connected with detection component, linkage actuator and position sensor respectively.The system, method, device, processor and its computer readable storage medium of the present application for achieving commercial catering water purifier and its failure degradation water supply control are used, reduce the overall water stop risk caused by equipment single point failure, improve failure recovery reliability, ensure catering water supply continuity, improve water safety management and equipment operation reliability.

Description

Technical Field

[0001] This invention relates to the field of commercial water purification equipment and its control technology, and particularly to the field of commercial catering water purifiers with fault adaptive degradation water supply function. Specifically, it refers to a system, method, device, processor and computer-readable storage medium for realizing commercial catering water purifiers and fault degradation water supply control. Background Technology

[0002] Restaurants, chain beverage stores, central kitchens, canteens, and bakeries typically use water purification equipment continuously during business hours to supply water to water dispensers, ice makers, steamers, cleaning equipment, beverage mixing equipment, and other water-using terminals. These commercial catering water purifiers usually employ booster pumps in conjunction with reverse osmosis or nanofiltration membranes for deep purification. To meet the requirements of high flow rates and continuous operation, the equipment can also be equipped with pre-filters, activated carbon filters, scale inhibition units, water storage units, and various detection elements.

[0003] After prolonged operation, membrane elements or pre-filters in the main purification branch may become contaminated or clogged; booster pumps may fail to start, run dry, overflow, have abnormal speed, or insufficient pressure; if membrane elements are damaged, seals fail, bypass leaks, or the water quality sensor detects anomalies, the TDS value or desalination rate of the effluent from the main branch may exceed the set range. These malfunctions often cause equipment shutdowns or water outages, affecting the continuous operation of catering establishments.

[0004] Some existing equipment is equipped with a manual bypass pipeline, allowing personnel to open the bypass valve to maintain water supply in the event of a failure in the main purification branch; other equipment has two filtration branches that can be switched using multiple solenoid valves. However, existing solutions still commonly suffer from problems such as misdiagnosis of faults, uncertain valve action sequence, cross-contamination between the two branches, long-term stagnation of water in the backup branch, lack of verification after switching, and unclear purpose of emergency water discharge.

[0005] The shortcomings of existing technologies are as follows: First, a single parameter exceeding its limit momentarily can easily cause erroneous switching. TDS sensors are affected by temperature, air bubbles, and stagnant water during the initial start-up and shutdown. Pressure and flow also change with the instantaneous water consumption of the store. It is difficult to distinguish between a real fault and a short-term disturbance based on a single instantaneous value.

[0006] Second, common parallel water circuits use multiple independent valves. When the controller or valve malfunctions, problems may occur such as the main purification branch and the backup branch being connected at the same time, untreated water backflowing, or water from the faulty branch mixing into the common water outlet pipeline.

[0007] Third, if the backup fine filtration branch has been out of service for an extended period, stagnant water may accumulate inside. Directly connecting this branch to the common outlet in the event of a malfunction would compromise the stability of the water output during the initial switching phase.

[0008] Fourth, if the booster pump fails, and the backup branch is still connected in series with the booster pump or located downstream of the booster pump, it will still be unable to supply water based on the raw water pressure after switching, and the failure downgrade operation cannot be truly achieved.

[0009] Fifth, fine filtration treatment typically does not possess the same desalination capacity as reverse osmosis or nanofiltration treatment. When the main branch line shuts down due to TDS anomalies, if the status of the standby fine filtration effluent is not marked and its intended use is not managed, users may mistakenly believe that the emergency effluent is still deeply desalinated water.

[0010] Sixth, after maintenance, existing equipment is usually switched back to the main purification branch by personnel. The lack of a pre-flushing mechanism for the main branch, continuous qualification confirmation, and switchback mechanism may lead to the introduction of abnormal water into the public water outlet pipeline again.

[0011] Therefore, there is a need for a commercial catering water purifier that combines fault diagnosis, internal valve isolation, backup branch pretreatment, emergency use management, and fault recovery control to improve water supply continuity and switching safety during failures.

[0012] The existing fixed disc and rotating disc type inlet and outlet water linkage shut-off structure is usually for maintenance isolation during the disassembly or drainage of the same filter element circuit. Its closed position is the water outage maintenance state. This type of structure does not solve the complementary selection between two alternative water supply branches, nor does it solve the problem of fault water, initial water from the backup branch, or mixed water from the two branches entering the common water outlet pipeline during the switch from normal water supply to emergency water supply. Summary of the Invention

[0013] The purpose of this invention is to overcome the shortcomings of the prior art and provide a system, method, device, processor and computer-readable storage medium for commercial catering water purifiers and their fault degradation water supply control that meets the requirements of good continuity, high safety and wide applicability.

[0014] To achieve the above objectives, the present invention provides a system, method, apparatus, processor, and computer-readable storage medium for implementing a commercial catering water purifier and its fault-based degraded water supply control, as follows: This system for controlling the degraded water supply in commercial catering water purifiers during malfunctions is characterized by comprising a casing, a raw water inlet, a common water outlet, a main purification branch, a backup fine filtration branch, a detection component, and a controller. The main purification branch includes a main branch filtration component, a booster pump, and a deep purification component. The backup fine filtration branch includes a fine filtration component that is set independently of the main branch filtration component, and the inlet end of the backup fine filtration branch is connected to the water path located upstream of the booster pump. The system also includes a switching valve assembly disposed within the housing. The switching valve assembly includes a valve body, an inlet water distribution section, an outlet water selection section, a linkage actuator, and a position sensor. The valve body is provided with a raw water interface, a main branch inlet water interface, a backup branch inlet water interface, a main branch return water interface, a backup branch return water interface, and a common outlet water interface. The inlet water distribution section and the outlet water selection section are connected to the same linkage shaft and are driven by the linkage actuator. The switching valve assembly has a normal position, an emergency position, a transition position between the normal position and the emergency position, and a fully closed position. In the normal position, the raw water interface is connected to the main branch inlet interface, the main branch return interface is connected to the common outlet interface, and the backup branch return interface is isolated from the common outlet interface. In the emergency position, the raw water interface is connected to the backup branch inlet interface, the backup branch return interface is connected to the common outlet interface, and the main branch return interface is isolated from the common outlet interface. In the transition position, both the main branch return interface and the backup branch return interface are isolated from the common outlet interface. The detection component is used to detect at least two types of parameters among the water quality parameters of the main purification branch, the pressure difference parameters of the filter component, the flow parameters of the main branch, and the electrical parameters and hydraulic response parameters of the booster pump. The controller is connected to the detection component, the linkage actuator and the position sensor respectively, and is used to confirm that at least one of the following faults occurs in the main purification branch: abnormal effluent quality, filter component blockage or booster pump failure, according to the detection parameters corresponding to the fault type. When the backup fine filtration branch meets the activation conditions, the controller drives the switching valve component to switch from the normal position to the emergency position through the transition position. The controller is also configured to, upon receiving the emergency position signal output by the position sensor, confirm whether the downgraded water supply has been established based on at least one of the pressure parameters, flow parameters, or water quality parameters of the backup fine filtration branch, and drive the switching valve assembly to the fully closed position and output a switching failure signal when the emergency position signal is received but the downgraded water supply confirmation condition is not met.

[0015] Preferably, the water inlet distribution section includes a first fixed valve plate and a first movable valve plate, and the water outlet selection section includes a second fixed valve plate and a second movable valve plate. The first movable valve plate and the second movable valve plate are fixed on the linkage shaft. The first movable valve plate is provided with an inlet guide groove, and the second movable valve plate is provided with an outlet guide groove. The inlet guide groove and the outlet guide groove are arranged according to a preset angle relationship, so that when the linkage shaft is in the transition position, the second movable valve plate simultaneously blocks the main branch return water interface and the backup branch return water interface. The angle width of the angle interval corresponding to the transition position is not less than the safety angle width determined according to the positioning error of the linkage actuator, the assembly error of the first moving valve plate and the second moving valve plate, and the allowable wear amount, so that before any branch return water interface starts to connect with the common water outlet interface, the other branch return water interface has been completely isolated from the common water outlet interface.

[0016] Preferably, the main branch water inlet is connected to the water inlet of the main purification branch, and the main branch return water inlet is connected to the water production end of the deep purification component; the backup branch water inlet is connected to the water inlet of the backup fine filtration branch, and the backup branch return water inlet is connected to the water outlet of the fine filtration component; the fine filtration component includes at least one of PP cotton filter element, activated carbon filter element, microfiltration component, ultrafiltration component, antibacterial filter element, and ultraviolet sterilization unit, and is driven by the pressure of the raw water inlet or by a backup pump independent of the booster pump.

[0017] Preferably, the detection components include a raw water TDS sensor and a main branch outlet TDS sensor; the controller calculates the apparent desalination rate R based on the raw water TDS value C_in and the main branch outlet TDS value C_out; when the main branch outlet TDS value C_out is greater than a preset outlet threshold and R is less than a preset desalination rate threshold for an extended period until the water quality anomaly confirmation time is reached, the controller confirms that the outlet water quality is abnormal; when C_out is greater than a preset safety upper limit, the controller confirms that the outlet water quality is abnormal without waiting for the water quality anomaly confirmation time to expire.

[0018] Preferably, the detection component includes pressure sensors disposed upstream and downstream of the filter component to be tested, and a main branch flow sensor; the controller performs a blockage determination when there is water demand at the common outlet, the raw water inlet pressure is within a preset allowable range, and the booster pump is in operation, and confirms that the filter component is blocked when the upstream and downstream pressure difference of the filter component to be tested is greater than a preset pressure difference threshold and the flow rate of the main purification branch is lower than a preset flow rate threshold for an extended period of time.

[0019] Preferably, the detection components include a pump electrical parameter detector, a pump speed detector, a pre-pump pressure sensor, a post-pump pressure sensor, and a main branch flow sensor; after sending an operation command to the booster pump, the controller establishes a pressure increase observation window and confirms the booster pump malfunction according to at least one of the following correspondences: the pump current is lower than the circuit breaker threshold and the post-pump pressure increment is lower than the booster threshold; the pump current is higher than the overcurrent threshold and the pump speed is lower than the speed threshold; the pump speed reaches the speed threshold while the post-pump pressure increment and the main branch flow are both lower than the corresponding thresholds.

[0020] Preferably, the backup fine filtration branch is equipped with a backup branch sensor and a flushing drain valve; before driving the switching valve assembly, the controller determines whether the raw water inlet pressure, the remaining lifespan of the fine filtration assembly, the internal leakage detection result, and the detection parameters of the backup branch sensor meet the preset activation conditions, and connects the backup fine filtration branch to the drainage passage when the preset activation conditions are met, until the preset flushing time, preset flushing volume, or preset water quality stability condition is reached, and then drives the switching valve assembly; during the period when the backup fine filtration branch is connected to the drainage passage, the backup branch return water interface remains isolated from the common water outlet interface.

[0021] Preferably, after the switching valve assembly reaches the emergency position, the controller closes the flush drain valve and confirms the establishment of degraded water supply based on the emergency position arrival signal and at least one of the backup branch pressure and backup branch flow.

[0022] Preferably, the controller is further configured to connect the backup fine filtration branch to the drainage passage for preservation flushing according to a preset cycle during the normal water supply state of the main purification branch, and to stop flushing after reaching a preset flushing time, a preset flushing volume, or a preset water quality stability condition; the preset cycle is determined based on at least one of ambient temperature, the last flushing time, and the water storage volume of the backup branch; during the preservation flushing, the return water interface of the backup branch is kept isolated from the common water outlet interface.

[0023] Preferably, a check valve and a pressure-stabilizing water storage assembly are provided upstream of the common water outlet. The pressure-stabilizing water storage assembly is used to release water to the common water outlet during the transition position of the switching valve assembly to reduce water pressure fluctuations.

[0024] Preferably, the system further includes a status output component and a water use permission execution component. The status output component outputs a degraded water supply status signal when the switching valve component is in the emergency position. The water use permission execution component includes control valves respectively installed on the water supply pipelines of the first type of water terminal and the second type of water terminal. The controller closes the control valve of the first type of water terminal in the degraded water supply state and allows the control valve of the second type of water terminal to open under preset authorization conditions.

[0025] Preferably, the switching valve assembly further includes an elastic reset mechanism and a manual operating unit; the elastic reset mechanism is used to return the switching valve assembly to the emergency position or the fully closed position when power is lost, and the manual operating unit is used to drive the linkage shaft to rotate in the power-off state, and has mechanical valve position marks corresponding to the normal position, the transition position and the emergency position respectively.

[0026] This invention relates to a method for controlling the degraded water supply in a commercial catering water purifier during malfunctions. The commercial catering water purifier includes a main purification branch, a backup fine filtration branch, and a switching valve assembly with normal, transition, emergency, and fully closed positions. The valve body of the switching valve assembly has a main branch return water interface, a backup branch return water interface, and a common outlet water interface. The common outlet water interface is connected to a common outlet water source. The inlet of the backup fine filtration branch is connected upstream of the booster pump of the main purification branch. The main feature of this method is that it includes the following steps: When the switching valve assembly is in the normal position, at least two types of parameters are collected from the following: water quality parameters of the main purification branch, pressure difference parameters of the filter assembly, flow parameters of the main branch, and electrical and hydraulic response parameters of the booster pump. Based on the collected parameters, at least one of the following abnormal indicators is generated under the effective detection conditions corresponding to each parameter: water quality abnormal indicator, blockage abnormal indicator, and pump abnormal indicator. The duration of the generated abnormal indicator is confirmed or repeated sampling is performed. After confirming that the main purification branch has failed, check whether the backup fine filtration branch meets the preset activation conditions. When the preset activation conditions are met, the backup fine filter branch is connected to the drainage passage for pre-filling or flushing. The switching valve assembly is driven from the normal position through a transitional position that isolates both the main branch return water interface and the backup branch return water interface from the common outlet water interface to the emergency position. Upon receiving the emergency location signal, the connection between the backup fine filtration branch and the drainage passage is cut off, and at least one of the backup branch pressure, backup branch flow rate, or backup branch water quality is detected. When the test result meets the downgraded water supply confirmation condition, a downgraded water supply status signal is output; when the test result does not meet the downgraded water supply confirmation condition, the switching valve assembly is turned to the fully closed position and a switching failure signal is output. During the pre-filling or flushing of the backup fine filter branch, the return water interface of the backup branch remains isolated from the common water outlet interface.

[0027] Preferably, the water quality anomaly indicator is generated when the TDS value of the main branch outlet water is greater than a preset outlet threshold and the apparent desalination rate is less than a preset desalination rate threshold, or it is generated directly when the TDS value of the main branch outlet water is greater than a preset safety upper limit; the blockage anomaly indicator is generated when the pressure difference between the upstream and downstream of the filter component is greater than a preset pressure difference threshold and the flow rate of the main branch is lower than a preset flow rate threshold; the pump anomaly indicator is generated based on the correspondence between the pump current or pump speed and the pressure increment after the pump and the flow rate of the main branch.

[0028] Preferably, after the main purification branch completes maintenance or the fault condition disappears, the backup fine filtration branch remains connected to the common outlet, and the permeate from the main purification branch enters the drainage passage or return passage. When the water quality parameters, pressure parameters, and flow parameters of the main purification branch continuously meet the recovery threshold within the recovery confirmation time, the switching valve assembly is driven to return from the emergency position to the normal position via the transition position. If the fault is confirmed again within the observation time after returning to the normal position, the system switches back to the emergency position and records the repeated fault event. A hysteresis is set between the recovery threshold and the corresponding fault threshold. During the period when the permeate from the main purification branch enters the drainage passage or return passage, the backup fine filtration branch remains connected to the common outlet.

[0029] Preferably, in the case of degraded water supply, an emergency fine-filtered water indicator is output to the local display, remote management platform or downstream water terminal, and the water supply pipeline of the first type of water terminal with mandatory requirements for deep desalination is shut off, and water is supplied only to the second type of water terminal that meets the preset authorization conditions.

[0030] Preferably, during the normal water supply period of the main purification branch, the backup fine filtration branch is connected to the drainage passage for preservation flushing according to a preset cycle, and the flushing is stopped after the preset flushing time, preset flushing volume, or preset water quality stability condition is reached; the preset cycle is determined based on at least one of ambient temperature, last flushing time, and water storage capacity of the backup branch; during the preservation flushing, the return water interface of the backup branch is kept isolated from the common water outlet interface.

[0031] The device for implementing commercial catering water purifiers and their fault-based water supply degradation control is characterized in that the device includes: A processor is configured to execute computer-executable instructions; The memory stores one or more computer-executable instructions, which, when executed by the processor, implement the steps of the above-described method for implementing a commercial catering water purifier and its fault-degrading water supply control.

[0032] The processor for implementing commercial catering water purifiers and their fault-based degraded water supply control is characterized in that the processor is configured to execute computer-executable instructions, which, when executed by the processor, implement the various steps of the above-described method for implementing commercial catering water purifiers and their fault-based degraded water supply control.

[0033] The computer-readable storage medium is characterized in that it stores a computer program thereon, which can be executed by a processor to implement the various steps of the above-described method for implementing a commercial catering water purifier and its fault-degrading water supply control.

[0034] The present invention relates to a system, method, apparatus, processor, and computer-readable storage medium for commercial catering water purifiers and their fault-based degraded water supply control. When abnormal effluent quality, filter blockage, or booster pump failure occurs in the main purification branch, the system switches to an independent backup fine filtration branch after cross-verification of multiple parameters. The inlet of the backup branch is located upstream of the booster pump, ensuring continuous water supply using raw water pressure even in the event of a booster pump failure, thereby reducing the risk of overall water outage caused by a single point of failure. The inlet distribution unit and the outlet selection unit are driven by the same linkage shaft and form a dual-path isolation at the transition position, using channel geometry... The system ensures isolation before connection to prevent cross-contamination and contamination of faulty water caused by asynchronous operation of multiple valves. The backup branch is flushed in the isolated state and verified by both valve position signals and pressure and flow parameters after switching to prevent stagnant water from entering the common outlet and to ensure that the emergency water supply status is verifiable. Combined with continuous anomaly confirmation, threshold hysteresis, recovery pre-flushing, and failure rollback mechanisms, it reduces erroneous switching and repeated switching, and improves the reliability of fault recovery. At the same time, by using downgraded status indicators and water use permission interlocks, the emergency water quality level is clearly defined, which improves water safety management and equipment operation reliability while ensuring the continuity of catering water supply. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall water circuit structure of the commercial catering water purifier and its fault degradation water supply control system, which is the embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram showing the connection relationship of the switching valve assembly of the system for realizing the commercial catering water purifier and its fault-reduced water supply control in the normal position, transition position and emergency position.

[0037] Figure 3 This is a structural block diagram of the detection and control system of the commercial catering water purifier and its fault-reduced water supply control system of the present invention.

[0038] Figure 4 The flowchart illustrates the fault adaptive degradation water supply control method for commercial catering water purifiers and their fault degradation water supply control methods according to the present invention.

[0039] Figure 5 This is a schematic diagram illustrating the state transition from normal water supply to emergency water supply and then back to normal water supply for the commercial catering water purifier and its fault degradation water supply control method of the present invention.

[0040] Figure label: 1 Raw water inlet 2 Common Preprocessing Components 3 Main purification branch 31 Main and branch filter components 32 Booster Pump 33 Deep purification components 34 Main and branch drain valves 4. Backup fine filter branch 41 Fine Filter Components 42 Backup branch sensors 43 Flushing drain valve 5. Switching valve assembly 51 Water Inlet Distribution Section 52. Water outlet selection section 53. Linkage actuator 54 position sensors 6 Public water outlet 61 Check valve 62 Pressure Stabilizing Water Storage Components 7 Detection Components 71 Raw Water TDS Sensor 72 Main and branch outlet TDS sensor 73 Pump inlet pressure sensor 74. Post-pump pressure sensor 75 Main and branch flow sensors 76 Pump Electrical Parameter Detector 77 Leakage Sensor 8 controllers 81 Fault Judgment Unit 82 Switching Control Unit 83 Recovery Control Unit 9. Status Output Component 91. Local display alarm component 92 Remote Communication Module 10. Water access control execution component 101 Class I Water Terminal 102 Second-class water terminal Detailed Implementation

[0041] To more clearly describe the technical content of the present invention, the following description is provided in conjunction with specific embodiments.

[0042] The present invention relates to a system for implementing a commercial catering water purifier and its fault-based degraded water supply control, comprising a casing, a raw water inlet 1, a common water outlet 6, a main purification branch 3, a backup fine filtration branch 4, a detection component 7, and a controller 8. The main purification branch 3 includes a main branch filtration component 31, a booster pump 32, and a deep purification component 33. The backup fine filtration branch 4 includes a fine filtration component 41 that is set independently of the main branch filtration component 31. The inlet of the backup fine filtration branch 4 is connected to the water path located upstream of the booster pump 32. The system also includes a switching valve assembly 5 disposed in the housing. The switching valve assembly 5 includes a valve body, a water inlet distribution section 51, a water outlet selection section 52, a linkage actuator 53, and a position sensor 54. The valve body is provided with a raw water interface, a main branch water inlet interface, a backup branch water inlet interface, a main branch return water interface, a backup branch return water interface, and a common water outlet interface. The water inlet distribution section 51 and the water outlet selection section 52 are connected to the same linkage shaft and are driven by the linkage actuator 53. The switching valve assembly 5 has a normal position, an emergency position, a transition position between the normal position and the emergency position, and a fully closed position. In the normal position, the raw water interface is connected to the main branch inlet interface, the main branch return interface is connected to the common outlet interface, and the backup branch return interface is isolated from the common outlet interface. In the emergency position, the raw water interface is connected to the backup branch inlet interface, the backup branch return interface is connected to the common outlet interface, and the main branch return interface is isolated from the common outlet interface. In the transition position, both the main branch return interface and the backup branch return interface are isolated from the common outlet interface. The detection component 7 is used to detect at least two types of parameters among the water quality parameters of the main purification branch 3, the pressure difference parameters of the filter component, the flow parameters of the main branch, and the electrical parameters and hydraulic response parameters of the booster pump 32. The controller 8 is connected to the detection component 7, the linkage actuator 53 and the position sensor 54 respectively, and is used to confirm, according to the detection parameters corresponding to the fault type, that at least one of the following faults occurs in the main purification branch 3: abnormal effluent quality, filter component blockage or booster pump failure, and drive the switching valve component 5 to switch from the normal position to the emergency position through the transition position when the backup fine filtration branch 4 meets the activation conditions. The controller 8 is also used to, after receiving the emergency position signal output by the position sensor 54, confirm whether the downgraded water supply has been established based on at least one of the pressure parameters, flow parameters, or water quality parameters of the backup fine filtration branch 4, and drive the switching valve assembly 5 to the fully closed position and output a switching failure signal when the emergency position signal is received but the downgraded water supply confirmation condition is not met.

[0043] In a preferred embodiment of the present invention, the water inlet distribution unit 51 includes a first fixed valve plate and a first movable valve plate, and the water outlet selection unit 52 includes a second fixed valve plate and a second movable valve plate. The first movable valve plate and the second movable valve plate are fixed on the linkage shaft. The first movable valve plate is provided with a water inlet guide groove, and the second movable valve plate is provided with a water outlet guide groove. The water inlet guide groove and the water outlet guide groove are arranged according to a preset angle relationship, so that when the linkage shaft is in the transition position, the second movable valve plate simultaneously blocks the main branch return water interface and the backup branch return water interface. The angular width of the angle range corresponding to the transition position is not less than the safe angular width determined based on the positioning error of the linkage actuator 53, the assembly error of the first moving valve plate and the second moving valve plate, and the allowable wear amount, so that before any branch return water interface starts to connect with the common water outlet interface, the other branch return water interface has been completely isolated from the common water outlet interface.

[0044] In a preferred embodiment of the present invention, the main branch water inlet is connected to the water inlet of the main purification branch 3, and the main branch return water inlet is connected to the water production end of the deep purification component 33; the backup branch water inlet is connected to the water inlet of the backup fine filtration branch 4, and the backup branch return water inlet is connected to the water outlet of the fine filtration component 41; the fine filtration component 41 includes at least one of PP cotton filter element, activated carbon filter element, microfiltration component, ultrafiltration component, antibacterial filter element and ultraviolet sterilization unit, and is driven by the pressure of the raw water inlet 1 or by a backup pump independent of the booster pump 32.

[0045] In a preferred embodiment of the present invention, the detection component 7 includes a raw water TDS sensor 71 and a main branch outlet TDS sensor 72; the controller 8 calculates the apparent desalination rate R based on the raw water TDS value C_in and the main branch outlet TDS value C_out; when the state of the main branch outlet TDS value C_out being greater than a preset outlet threshold and R being less than a preset desalination rate threshold continues to reach the water quality anomaly confirmation time, the controller 8 confirms that the outlet water quality is abnormal; when C_out is greater than a preset safety upper limit, the controller 8 confirms that the outlet water quality is abnormal without waiting for the water quality anomaly confirmation time to expire.

[0046] In a preferred embodiment of the present invention, the detection component 7 includes pressure sensors disposed upstream and downstream of the filter component to be detected, and a main branch flow sensor 75; the controller 8 performs a blockage determination when there is a water demand at the common outlet 6, the raw water inlet pressure is within a preset allowable range, and the booster pump 32 is in operation, and confirms that the filter component is blocked when the upstream and downstream pressure difference of the filter component to be detected is greater than a preset pressure difference threshold and the flow rate of the main purification branch 3 is lower than a preset flow rate threshold for an extended period of time.

[0047] In a preferred embodiment of the present invention, the detection component 7 includes a pump electrical parameter detector 76, a pump speed detector, a pump inlet pressure sensor 73, a pump outlet pressure sensor 74, and a main branch flow sensor 75; after sending an operation command to the booster pump 32, the controller 8 establishes a pressure boosting observation window and confirms the booster pump malfunction according to at least one of the following correspondences: the pump current is lower than the circuit breaking threshold and the pump outlet pressure increment is lower than the pressure boosting threshold; the pump current is higher than the overcurrent threshold and the pump speed is lower than the speed threshold; the pump speed reaches the speed threshold while the pump outlet pressure increment and the main branch flow are both lower than the corresponding thresholds.

[0048] In a preferred embodiment of the present invention, the backup fine filtration branch 4 is equipped with a backup branch sensor 42 and a flushing drain valve 43. Before driving the switching valve assembly 5, the controller 8 determines whether the raw water inlet pressure, the remaining lifespan of the fine filtration assembly 41, the internal leakage detection result, and the detection parameters of the backup branch sensor 42 meet the preset activation conditions. When the preset activation conditions are met, the controller 8 connects the backup fine filtration branch 4 to the drainage passage until the preset flushing time, preset flushing volume, or preset water quality stability condition is reached, and then drives the switching valve assembly 5. During the period when the backup fine filtration branch 4 is connected to the drainage passage, the backup branch return water interface remains isolated from the common water outlet interface.

[0049] In a preferred embodiment of the present invention, after the switching valve assembly 5 reaches the emergency position, the controller 8 closes the flushing drain valve 43 and confirms the establishment of downgraded water supply based on the emergency position arrival signal and at least one of the backup branch pressure and backup branch flow.

[0050] In a preferred embodiment of the present invention, the controller 8 is further configured to connect the backup fine filtration branch 4 to the drainage passage for fresh-keeping rinsing according to a preset cycle during the normal water supply state of the main purification branch 3, and to stop rinsing after reaching a preset rinsing time, a preset rinsing volume, or a preset water quality stability condition; the preset cycle is determined based on at least one of the ambient temperature, the last rinsing time, and the water storage capacity of the backup branch; during the fresh-keeping rinsing, the return water interface of the backup branch is kept isolated from the common water outlet interface.

[0051] In a preferred embodiment of the present invention, a check valve 61 and a pressure-stabilizing water storage component 62 are provided upstream of the common water outlet 6. The pressure-stabilizing water storage component 62 is used to release water to the common water outlet 6 during the transition position of the switching valve component 5 to reduce water pressure fluctuation.

[0052] In a preferred embodiment of the present invention, the system further includes a status output component 9 and a water use authority execution component 10. The status output component 9 outputs a downgraded water supply status signal when the switching valve component 5 is in the emergency position. The water use authority execution component 10 includes control valves respectively installed on the water supply pipelines of the first type of water terminal 101 and the second type of water terminal 102. The controller 8 closes the control valve of the first type of water terminal 101 in the downgraded water supply state and allows the control valve of the second type of water terminal 102 to open under preset authorization conditions.

[0053] In a preferred embodiment of the present invention, the switching valve assembly 5 further includes an elastic reset mechanism and a manual operating part; the elastic reset mechanism is used to return the switching valve assembly 5 to the emergency position or the fully closed position when power is lost, and the manual operating part is used to drive the linkage shaft to rotate in the power-off state, and has mechanical valve position marks corresponding to the normal position, the transition position and the emergency position respectively.

[0054] The present invention discloses a commercial catering water purifier and a method for controlling water supply degradation in case of failure. The commercial catering water purifier includes a main purification branch, a backup fine filtration branch, and a switching valve assembly having a normal position, a transition position, an emergency position, and a fully closed position. The valve body of the switching valve assembly is provided with a main branch return water interface, a backup branch return water interface, and a common water outlet interface. The common water outlet interface is connected to a common water outlet. The inlet end of the backup fine filtration branch is connected upstream of the booster pump of the main purification branch. The method includes the following steps: When the switching valve assembly is in the normal position, at least two types of parameters are collected from the following: water quality parameters of the main purification branch, pressure difference parameters of the filter assembly, flow parameters of the main branch, and electrical and hydraulic response parameters of the booster pump. Based on the collected parameters, at least one of the following abnormal indicators is generated under the effective detection conditions corresponding to each parameter: water quality abnormal indicator, blockage abnormal indicator, and pump abnormal indicator. The duration of the generated abnormal indicator is confirmed or repeated sampling is performed. After confirming that the main purification branch has failed, check whether the backup fine filtration branch meets the preset activation conditions. When the preset activation conditions are met, the backup fine filter branch is connected to the drainage passage for pre-filling or flushing. The switching valve assembly is driven from the normal position through a transitional position that isolates both the main branch return water interface and the backup branch return water interface from the common outlet water interface to the emergency position. Upon receiving the emergency location signal, the connection between the backup fine filtration branch and the drainage passage is cut off, and at least one of the backup branch pressure, backup branch flow rate, or backup branch water quality is detected. When the test result meets the downgraded water supply confirmation condition, a downgraded water supply status signal is output; when the test result does not meet the downgraded water supply confirmation condition, the switching valve assembly is turned to the fully closed position and a switching failure signal is output. During the pre-filling or flushing of the backup fine filter branch, the return water interface of the backup branch remains isolated from the common water outlet interface.

[0055] In a preferred embodiment of the present invention, the water quality anomaly indicator is generated when the TDS value of the main branch outlet water is greater than a preset outlet threshold and the apparent desalination rate is less than a preset desalination rate threshold, or is generated directly when the TDS value of the main branch outlet water is greater than a preset safety upper limit; the blockage anomaly indicator is generated when the pressure difference between the upstream and downstream of the filter component is greater than a preset pressure difference threshold and the flow rate of the main branch is lower than a preset flow rate threshold; the pump anomaly indicator is generated based on the correspondence between the pump current or pump speed and the pressure increment after the pump and the flow rate of the main branch.

[0056] In a preferred embodiment of the present invention, after the main purification branch completes maintenance or the fault condition disappears, the backup fine filtration branch remains connected to the common outlet, and the product water from the main purification branch enters the drainage passage or return passage; when the water quality parameters, pressure parameters, and flow parameters of the main purification branch continuously meet the recovery threshold within the recovery confirmation time, the switching valve assembly is driven to return from the emergency position to the normal position via the transition position; if the fault is confirmed again within the observation time after returning to the normal position, the system is switched back to the emergency position and the repeated fault event is recorded, wherein a hysteresis is set between the recovery threshold and the corresponding fault threshold; while the product water from the main purification branch enters the drainage passage or return passage, the backup fine filtration branch remains connected to the common outlet.

[0057] In a preferred embodiment of the present invention, under degraded water supply conditions, an emergency fine-filtered water indicator is output to the local display, remote management platform or downstream water terminal, and the water supply pipeline of the first type of water terminal with mandatory requirements for deep desalination is shut off, and water is supplied only to the second type of water terminal that meets the preset authorization conditions.

[0058] In a preferred embodiment of the present invention, during the normal water supply period of the main purification branch, the backup fine filtration branch is connected to the drainage channel for fresh-keeping rinsing according to a preset cycle, and rinsing is stopped after the preset rinsing time, preset rinsing volume, or preset water quality stability condition is reached; the preset cycle is determined according to at least one of ambient temperature, last rinsing time, and water storage volume of the backup branch; during the fresh-keeping rinsing, the return water interface of the backup branch is kept isolated from the common water outlet interface.

[0059] The present invention relates to a device for implementing a commercial catering water purifier and a fault-based degraded water supply control, wherein the device comprises: A processor is configured to execute computer-executable instructions; The memory stores one or more computer-executable instructions, which, when executed by the processor, implement the steps of the above-described method for implementing a commercial catering water purifier and its fault-degrading water supply control.

[0060] The present invention relates to a processor for implementing a commercial catering water purifier and its fault-based degraded water supply control, wherein the processor is configured to execute computer-executable instructions, and when the computer-executable instructions are executed by the processor, the various steps of the above-described method for implementing a commercial catering water purifier and its fault-based degraded water supply control are implemented.

[0061] The computer-readable storage medium of the present invention stores a computer program that can be executed by a processor to implement the various steps of the above-described method for implementing a commercial catering water purifier and its fault-degrading water supply control.

[0062] This invention relates to a commercial catering water purifier with fault adaptive degradation water supply function and its control method. When abnormal water quality occurs in the main purification branch, the filter cartridge in the main branch becomes clogged, or the booster pump fails, the purifier, after fault confirmation, controls the internal switching valve assembly to switch the water supply path to an independent backup fine filtration branch. This allows the equipment to continue providing water for the catering process in a clearly marked emergency mode, and the switching process, emergency water output status, and fault recovery process are interlocked and controlled.

[0063] The purpose of this invention is to provide a commercial catering water purifier with fault adaptive degradation water supply function and its control method, so as to solve the problem of overall water outage when the main purification branch has abnormal TDS of effluent, filter blockage or booster pump failure, and reduce the risks caused by instantaneous disturbance misjudgment, cross-contamination between two branches, water stagnation in the backup branch, lack of verification after switching and unclear purpose of emergency water output.

[0064] The technical problem to be solved by this invention is: when the main purification branch and the backup fine filtration branch have different processing capacities and driving conditions, complementary selection is implemented for the inlet and return water of the two branches in a way that does not rely on the timing of multiple independent valve software actions, and a deterministic state sequence of isolation and then connection is established at the common outlet; at the same time, the backup branch is in a verifiable ready state before being connected to the common outlet, so that the switching command, valve position result and actual water supply result form a closed loop.

[0065] To achieve the above objectives, the present invention provides a commercial catering water purifier with fault adaptive degradation water supply function, including a housing, a raw water inlet, a public water outlet, a main purification branch, a backup fine filtration branch, a switching valve assembly, a detection assembly, and a controller.

[0066] The raw water inlet can be selectively connected to the inlet of both the main purification branch and the backup fine filtration branch. The main purification branch includes a main branch filtration assembly, a booster pump, and a deep purification assembly. The deep purification assembly is a reverse osmosis membrane assembly, a nanofiltration membrane assembly, or other membrane separation assembly capable of reducing the content of dissolved substances in the water. The backup fine filtration branch includes a fine filtration assembly independently of the main branch filtration assembly. Its inlet is located upstream of the booster pump, allowing the backup fine filtration branch to supply water under the pressure of the raw water inlet or an independent backup drive pressure in the event of a booster pump failure. The fine filtration assembly may include one or more of the following: PP cotton filter cartridges, activated carbon filter cartridges, microfiltration components, ultrafiltration components, and antibacterial filter cartridges.

[0067] The switching valve assembly is housed within the casing and includes a valve body, an inlet water distribution section, an outlet water selection section, a linkage actuator, and a position sensor. The valve body has a raw water inlet, a main branch inlet, a backup branch inlet, a main branch return water inlet, a backup branch return water inlet, and a common outlet water inlet. The inlet water distribution section controls the connection between the raw water inlet and the main branch inlet and backup branch inlet; the outlet water selection section controls the connection between the main branch return water inlet, the backup branch return water inlet, and the common outlet water inlet.

[0068] The inlet water distribution unit and the outlet water selection unit are connected to the same linkage shaft and driven by the same linkage actuator, or they can be equipped with separate actuators and kept synchronized by a hardware interlock mechanism. When the switching valve assembly is in the normal position, the raw water interface is connected to the main branch inlet interface, the main branch return water interface is connected to the common outlet interface, and the backup branch return water interface is isolated from the common outlet interface. When the switching valve assembly is in the emergency position, the raw water interface is connected to the backup branch inlet interface, the backup branch return water interface is connected to the common outlet interface, and the main branch return water interface is isolated from the common outlet interface. A transitional position with dual-circuit shutdown is set between the normal position and the emergency position, and the position sensor is used to output valve position signals for the normal position, transitional position, and emergency position respectively. Thus, the branch inlet and branch outlet are switched in the same action, avoiding cross-flow and backflow caused by asynchronous operation of multiple independent valves.

[0069] In a preferred configuration, the inlet distribution section includes a first fixed valve plate and a first movable valve plate, and the outlet selection section includes a second fixed valve plate and a second movable valve plate. The first and second movable valve plates are fixed on the same linkage shaft. The first movable valve plate forms an inlet guide groove, and the second movable valve plate forms an outlet guide groove. The two guide grooves are staggered in the circumferential direction, so that when the linkage shaft passes through a preset angle range between the normal position and the emergency position, neither the main branch return water interface nor the backup branch return water interface is connected to the common outlet water interface. The switching valve assembly can also use a multi-way rotary valve, a slide valve, or an integrated valve block with hardware interlocking that has the same communication relationship.

[0070] The guide grooves of the first and second moving valve plates are configured according to a disconnect-then-connect relationship: when the linkage shaft rotates from the normal position to the emergency position, the main branch return water interface is completely isolated from the common water outlet interface before the backup branch return water interface begins to connect with the common water outlet interface; during reverse switching, the backup branch return water interface is completely isolated from the common water outlet interface before the main branch return water interface begins to connect with the common water outlet interface. The angle width of the transition position is determined according to the positioning error of the linkage actuator, the valve plate assembly error, and the allowable wear, so that the above isolation relationship does not depend on the controller timing multiple valves separately.

[0071] The detection component is used to collect at least two types of parameters from the main purification branch: water quality parameters, differential pressure parameters, and flow rate parameters, as well as booster pump operating parameters. The controller first generates water quality anomaly indicators, blockage anomaly indicators, and pump anomaly indicators based on these parameters, and then confirms the duration and validity of the anomaly indicators. Only after confirming a fault in the main purification branch and that the backup fine filtration branch meets the activation conditions will the controller drive the switching valve assembly to switch from the normal position to the emergency position and output a degraded water supply status signal.

[0072] A fault in the main purification branch circuit includes at least one of the following: abnormal effluent quality, blockage of the main branch circuit's filter or deep purification components, or a booster pump malfunction. Abnormal effluent quality can be determined based on the TDS value of the effluent from the main purification branch circuit exceeding an absolute threshold, the desalination rate calculated relative to the raw water's TDS value being lower than a relative threshold, or a combination of both. To reduce false alarms, the controller can perform temperature compensation, moving average, or median filtering on the water quality signal, and requires the abnormal state to persist for a preset confirmation time or reach a preset number of times within multiple consecutive sampling periods.

[0073] Filter cartridge clogging can be determined based on the pressure difference between the upstream and downstream of the filter assembly exceeding a differential pressure threshold. Alternatively, when there is water demand at the common outlet and the inlet pressure is normal, it can be determined based on the main purification branch flow rate being lower than a flow rate threshold or the water production per unit pump power being lower than an efficiency threshold. The controller can also combine differential pressure, flow rate, cumulative treated water volume, and pump operating status to differentiate between filter cartridge clogging, raw water underpressure, and downstream water outages.

[0074] Booster pump malfunctions can be determined based on the correlation between electrical parameters and hydraulic responses: After sending an operating command to the booster pump, the controller establishes a pressure rise observation window; within this window, the pump current or power, pump speed, downstream pressure increment, and main branch flow are monitored. If the pump current is below the circuit breaker threshold and the downstream pressure does not rise, it is determined to be not started; if the pump current is above the overcurrent threshold and the pump speed is below the speed threshold, it is determined to be stalled; if the pump speed reaches the speed threshold but the downstream pressure increment and main branch flow do not reach their corresponding thresholds, it is determined to be idling, pump failure, or hydraulic passage leakage. This determination establishes a correlation between electrical and hydraulic responses, reducing misjudgments caused by relying solely on a single current or pressure signal.

[0075] The above multi-parameter judgment is only performed under valid detection conditions corresponding to the fault type. Differential pressure and flow data used to determine blockage should be collected when there is water demand, the raw water pressure is within acceptable range, and the booster pump has entered a stable operating state. Electrical parameters and hydraulic response used to determine booster pump faults should be within the same pressure increase observation window. When the fault mechanisms indicated by different parameters contradict each other, the controller enters a retest or sensor fault handling state, instead of directly authorizing water circuit switching.

[0076] The backup fine filtration branch is equipped with at least one of a backup branch pressure sensor, a backup branch flow sensor, or a backup branch water quality sensor. Activation conditions for the backup fine filtration branch may include raw water inlet pressure not lower than the emergency water supply lower limit, the backup fine filtration component not reaching the end of its lifespan, no leaks detected inside the unit, and the detection parameters of the backup fine filtration branch meeting preset emergency standards. When the activation conditions are not met, the controller keeps the common outlet closed or only opens the authorized restricted outlets, and outputs a water outage alarm.

[0077] The backup fine filtration branch can also be connected to a flushing drainage path. During normal operation, the controller briefly connects the backup fine filtration branch to the flushing drainage path at preset intervals to refresh the water stored in the backup fine filtration branch. In case of fault switching, the controller can first connect the backup fine filtration branch to the flushing drainage path, and after the preset flushing time, flushing volume, or water quality stability conditions of the backup branch are met, the water outlet selection unit will then connect the backup fine filtration branch to the common outlet. For scenarios requiring extremely short switching times, the flushing step during a fault can be omitted, or the periodic fresh flushing during normal operation can be used to keep the backup branch in an immediately usable state.

[0078] During the periodic preservation, pre-filling, or flushing of the backup fine filtration branch, the outlet water selection unit keeps the backup branch return water interface isolated from the common outlet water interface, ensuring that water only enters the drainage path during the initial flushing stage. Only after both the flushing end condition and the backup branch activation condition are met will the controller allow the actuator to cross the transition position and establish the emergency position connection.

[0079] A check valve and a pressure-stabilizing water storage assembly can be installed upstream of the public water outlet. The check valve prevents water in the public water outlet pipeline from flowing back into any purification branch; the pressure-stabilizing water storage assembly releases a certain volume of water during the transition period of the switching valve assembly to reduce water pressure fluctuations. The pressure-stabilizing water storage assembly can be a pressure tank, a flexible water storage chamber, or a piston-type accumulator.

[0080] To differentiate between normal deep-purified water and emergency fine-filtered water, the controller outputs a degraded water supply status signal in the emergency position, which can be recognized by the local display, audible and visual alarm, remote communication module, or downstream water terminals. The water purifier may further include a water access control component. This component connects to at least two types of water terminals, allowing both types to draw water in normal mode; in emergency mode, it shuts off the first type of water terminal (which has mandatory requirements for deep desalination) and only allows the second type of water terminal (used in catering processes) to draw water. The first type of water terminal may include direct drinking water terminals or equipment with strict TDS range requirements, while the second type of water terminal may include cleaning, pretreatment, or other non-direct drinking water processes permitted after fine filtration of local raw water. Specific applications should be determined based on local water quality, hygiene requirements, and store processes.

[0081] The switching valve assembly can be equipped with a resilient reset mechanism and a manual operation unit. In the event of power failure or controller malfunction, the resilient reset mechanism keeps the switching valve assembly in or returns it to a preset safe position. The preset safe position can be selected as an emergency position or a fully closed position depending on the equipment application. The manual operation unit allows maintenance personnel to perform on-site switching after confirming water quality and hydraulic conditions, and provides feedback on the valve position to the controller via a position sensor.

[0082] This invention also provides a fault-adaptive degraded water supply control method for commercial catering water purifiers, comprising: collecting at least one of the following parameters from the main purification branch: water quality parameters, differential pressure parameters, flow rate parameters, and booster pump operating parameters; identifying whether there is water quality abnormality, filter blockage, or booster pump failure in the main purification branch based on the collected parameters; performing duration confirmation, multi-parameter consistency confirmation, or resampling confirmation on the identified abnormalities; checking the activation conditions of the backup fine filtration branch after the fault is confirmed; when the activation conditions are met, pre-filling or flushing the backup fine filtration branch, controlling the switching valve assembly to isolate the main purification branch and connecting the backup fine filtration branch to the common outlet; detecting the outlet pressure, flow rate, or water quality after switching to confirm the establishment of emergency water supply; and outputting the degraded water supply status and fault information.

[0083] When maintenance is completed or the fault condition disappears in the main purification branch, the controller does not immediately restore normal water supply. Instead, it allows the produced water from the main purification branch to enter the drainage or return flow path for pre-flushing. After the water quality, pressure, and flow rate of the main purification branch remain within the preset recovery confirmation time, the control switching valve assembly switches back to the normal position. If a fault is detected again after switching back, the controller reverts to the emergency position and records the repeated fault event. To prevent frequent switching of the equipment near the threshold, a hysteresis can be set between the fault threshold and the recovery threshold.

[0084] During the pre-flushing and recovery confirmation of the main purification branch, the backup fine filtration branch remains connected to the public outlet, while the product water from the main purification branch remains isolated from the public outlet. Therefore, the recovery test will not interrupt the established emergency water supply, nor will it introduce product water from the main branch that has not yet consistently met the recovery threshold into the public outlet pipeline.

[0085] In specific embodiments of the present invention, the following examples are provided: Example 1: Dual-branch catering water purifier with interlocking switching valve assembly like Figure 1 As shown, the commercial catering water purifier in this embodiment is housed within the same casing, including a raw water inlet 1, a common pretreatment component 2, a main purification branch 3, a backup fine filtration branch 4, a switching valve component 5, a common water outlet 6, a detection component 7, a controller 8, a status output component 9, and a water usage permission execution component 10. The raw water inlet, main branch inlet, backup branch inlet, main branch return inlet, backup branch return inlet, and common water outlet will be abbreviated as P, M1, B1, M2, B2, and O, respectively.

[0086] Raw water inlet 1 is connected to the municipal water supply pipe. The common pretreatment component 2 includes an optional coarse filter and a pressure regulator to trap large particles that may damage the valve body and stabilize the inlet pressure. The common pretreatment component 2 only performs basic protection functions and does not use a precision filter element, which is the primary lifespan component of the main branch, to avoid clogging and blocking both water supply branches. In another embodiment, the common pretreatment component 2 can be omitted, or each of the two branches can be equipped with an independent inlet protection component.

[0087] The main purification branch 3 sequentially includes a main branch filter assembly 31, a booster pump 32, and a deep purification assembly 33. The main branch filter assembly 31 includes a first PP cotton filter element and a pre-activated carbon filter element; the booster pump 32 is a DC diaphragm pump with Hall effect speed feedback, and the pump speed detector is implemented by a Hall effect speed feedback element built into the booster pump 32; the deep purification assembly 33 is a reverse osmosis membrane assembly. The concentrate port of the reverse osmosis membrane assembly is connected to the wastewater pipe, and its product water port is connected to the common outlet 6 through the outlet selection section 52 of the switching valve assembly 5. The main branch drain valve 34 is connected between the product water port and the drain pipe of the deep purification assembly 33, and is used for initial flushing during start-up and shutdown and for water quality confirmation after maintenance.

[0088] The inlet of the backup fine filtration branch 4 is connected downstream of the common pretreatment component 2, and the connection point is located upstream of the booster pump 32. The backup fine filtration branch 4 sequentially comprises an independent PP cotton filter element, an ultrafiltration membrane assembly, and a post-activated carbon filter element, forming a fine filtration assembly 41. This branch produces finely filtered water under the pressure of the municipal inlet, independent of the booster pump 32. The outlet of the backup fine filtration branch 4 is equipped with a backup branch sensor 42, which includes a pressure sensor and a flow sensor. The backup fine filtration branch 4 is also connected to a drain pipe via a flush drain valve 43.

[0089] like Figure 2 As shown, the switching valve assembly 5 adopts a six-interface integrated valve block, including a valve body, an inlet water distribution section 51, an outlet water selection section 52, a linkage actuator 53, and a position sensor 54. The valve body is provided with a raw water interface P, a main branch inlet water interface M1, a backup branch inlet water interface B1, a main branch return water interface M2, a backup branch return water interface B2, and a common outlet water interface O. The raw water interface P is connected to the raw water inlet 1; the main branch inlet water interface M1 and the main branch return water interface M2 are respectively connected to the inlet end and the product water end of the main purification branch 3; the backup branch inlet water interface B1 and the backup branch return water interface B2 are respectively connected to the inlet end and the outlet end of the backup fine filtration branch 4; the common outlet water interface O is connected to the common outlet water 6.

[0090] The water inlet distribution unit 51 includes a first fixed valve plate and a first movable valve plate, and the water outlet selection unit 52 includes a second fixed valve plate and a second movable valve plate. The first movable valve plate and the second movable valve plate are fixed on the same linkage shaft, and the water inlet guide groove of the first movable valve plate and the water outlet guide groove of the second movable valve plate are arranged according to a predetermined angle relationship. When the linkage shaft is in the first angle (i.e., the normal position), the raw water interface P is connected to the main branch water inlet interface M1, the main branch return water interface M2 is connected to the common water outlet interface O, and the backup branch return water interface B2 is isolated from the common water outlet interface O. When the linkage shaft is in the second angle (i.e., the emergency position), the raw water interface P is connected to the backup branch water inlet interface B1, the backup branch return water interface B2 is connected to the common water outlet interface O, and the main branch return water interface M2 is isolated from the common water outlet interface O.

[0091] A transition position is provided between the first angle and the second angle. When the linkage shaft is in the transition position, the second moving valve plate simultaneously blocks the main branch return water interface M2 and the backup branch return water interface B2, preventing either branch from connecting to the common outlet interface O. The position sensor 54 outputs valve position signals corresponding to the first angle, the transition position, and the second angle; the controller 8 only performs backup branch outlet verification after receiving the second angle completion signal. This structure uses the same linkage shaft to determine the correspondence between inlet and outlet water, preventing branch cross-flow without relying on the software action sequence of multiple valves. The position sensor 54 can also output a valve position signal corresponding to the fully closed position, or the controller 8 can confirm the fully closed position based on the drive stroke of the linkage actuator 53.

[0092] The sequence of states when the linkage shaft moves from the first angle to the second angle is as follows: the main branch return water interface is connected to the common outlet water interface; both branch return water interfaces are isolated from the common outlet water interface; and the backup branch return water interface is connected to the common outlet water interface. The reverse sequence applies during reverse movement. At no given time should both the main branch return water interface and the backup branch return water interface be simultaneously connected to the common outlet water interface. The position sensor can employ two or more independent switching quantity detection elements or continuous angle sensors, and any valve position signal combination that does not conform to the above sequence is considered an abnormal valve position.

[0093] In embodiments where it is not necessary to simultaneously shut off the branch inlets, the water inlet distribution unit 51 can allow the unselected backup fine filtration branch 4 to draw water when the flushing drain valve 43 is open, but the water outlet selection unit 52 still keeps the unselected branch isolated from the common outlet 6. Thus, the backup fine filtration branch 4 can be pre-filled and flushed while the main purification branch 3 continues to supply water.

[0094] A check valve 61 and a pressure-stabilizing water storage assembly 62 are sequentially installed upstream of the common outlet 6. The effective release volume of the pressure-stabilizing water storage assembly 62 is 0.2L to 2L, maintaining the pressure of the common outlet 6 for 0.2s to 2s during the transition period when the switching valve assembly 5 passes through the transition position. The values ​​mentioned are for illustrative purposes only and can be set according to the rated flow rate of the equipment and the allowable pressure fluctuation.

[0095] The detection component 7 includes a raw water TDS sensor 71, a main branch outlet TDS sensor 72, a pre-pump pressure sensor 73, a post-pump pressure sensor 74, a main branch flow sensor 75, a pump electrical parameter detector 76, and a leakage sensor 77. The raw water TDS sensor 71 is located downstream of the raw water inlet 1; the main branch outlet TDS sensor 72 is located at the product water outlet of the deep purification component 33; the pre-pump pressure sensor 73 and the post-pump pressure sensor 74 are located at the inlet and outlet sides of the booster pump 32, respectively; and the pump electrical parameter detector 76 detects the current, voltage, or power of the booster pump 32.

[0096] like Figure 3As shown, the controller 8 includes a fault determination unit 81, a switching control unit 82, and a recovery control unit 83. The controller 8 can be implemented by a microcontroller, a programmable logic controller, or an embedded control board with input / output interfaces. The status output component 9 includes a local display alarm component 91 and a remote communication module 92, used to display or send statuses such as normal operation, fault confirmation, switching in progress, emergency water supply, emergency water supply failure, recovery detection, and recovery to normal.

[0097] Example 2: Fault Diagnosis and Automatic Switching like Figure 4 As shown, in normal mode, the switching valve assembly 5 is at the first angle, and the main purification branch 3 supplies water to the common outlet 6. The controller 8 reads the detection assembly 7 with a sampling cycle of 1 second and processes the data in segments according to the equipment start-up and shutdown status. In the first 10 to 60 seconds after the booster pump 32 starts, the water produced in the main branch can be discharged through the main branch drain valve 34, and the TDS fault determination is temporarily suspended to eliminate the influence of stagnant water in the initial start-up and shutdown period.

[0098] Anomalies in the TDS of the main branch effluent are determined using a combination of absolute value and relative desalination rate. Controller 8 calculates the apparent desalination rate R based on the raw water TDS value C_in and the main branch effluent TDS value C_out. R = 1 - C_out / C_in.

[0099] Where C_in and C_out are both in mg / L, and R is a dimensionless ratio.

[0100] When C_out is greater than the preset effluent threshold T_out and R is less than the preset desalination rate threshold R_min, and both conditions are met consecutively within the confirmation time t_confirm, a water quality anomaly flag F_TDS is generated. For severe anomalies where C_out exceeds the safety upper limit T_safe, the controller 8 can directly generate F_TDS without waiting for the relative desalination rate condition to be met. For example, t_confirm is 30s to 300s. The threshold is set according to the membrane type, raw water quality, and downstream equipment requirements, and is not limited to a fixed TDS value.

[0101] When the main branch filter assembly 31 or the deep purification assembly 33 becomes clogged, the pressure difference between the upstream and downstream of the corresponding filter assembly increases, and the flow rate of the main branch decreases. The controller 8 performs a clogging determination only under the effective detection conditions of water demand at the common outlet 6, raw water inlet pressure within a preset allowable range, and booster pump 32 being operational. When the pressure difference between the upstream and downstream of the filter assembly exceeds the pressure difference threshold and the flow rate of the main branch is lower than a preset proportion of the rated flow rate, a clogging anomaly flag F_DP is generated after these two conditions have persisted for a preset time. In embodiments where pressure sensors are installed before and after each filter element, the specific clogged filter element can be located based on the corresponding pressure difference.

[0102] After controller 8 sends a run command to booster pump 32, the booster observation window is opened. If the pump current is less than the circuit breaker threshold and the pressure increment after the pump is less than the booster threshold, a non-start flag is generated; if the pump current is greater than the overcurrent threshold and the speed is less than the speed threshold, a stall flag is generated; if the speed reaches the speed threshold but the pressure increment after the pump and the main branch flow are both less than the corresponding thresholds, an idle or pump failure flag is generated. After any flag is repeatedly sampled and confirmed, a pump abnormality flag F_PUMP is generated.

[0103] The fault determination unit 81 processes F_TDS, F_DP, and F_PUMP according to the fault type. If any abnormal flag persists for its corresponding confirmation time, or if a preset severe fault flag such as a serious water quality abnormality or pump blockage is triggered, the fault determination unit 81 outputs a main branch fault confirmation signal. If the valid detection conditions are not met, the abnormal flag disappears within the confirmation time, or the sensor self-test fails, the water circuit switching is not performed directly; instead, the system enters a retest or sensor fault handling state.

[0104] After fault confirmation, controller 8 first reads the backup branch sensor 42, backup filter life record, and leakage sensor 77. If the inlet pressure reaches the emergency water supply lower limit, the backup fine filter assembly has not reached the end of its life, and no leakage has occurred, then the flushing drain valve 43 is opened to pre-fill and flush the backup fine filter branch 4. After flushing reaches the set time or volume, controller 8 closes the flushing drain valve 43 and confirms that the backup branch pressure has been established.

[0105] Subsequently, the actuator 53 drives the switching valve assembly 5 to rotate from the first angle to the second angle. When the outlet water selection unit 52 passes through the transition position, the pressure stabilizing water storage assembly 62 compensates for the short-term pressure drop. After the position sensor 54 reports that the second angle has been reached, the controller 8 reads the common outlet water pressure, the flow rate of the backup branch, and the water quality signal of the selectable backup branch. If the detected values ​​meet the emergency water supply standards, the controller confirms the successful switching and outputs the emergency water supply status; if the detected values ​​do not meet the standards, the controller 8 rotates the switching valve assembly 5 to the fully closed position and outputs an emergency water supply failure alarm.

[0106] If the position sensor 54 fails to output the second angle positioning signal within the preset action time, or if the pressure, flow rate, or water quality of the backup branch does not meet the downgraded water supply confirmation conditions after the valve position is in place, the controller 8 will not output an emergency water supply success status. Instead, it will drive the switching valve assembly 5 to the fully closed position and keep the control valves of the first and second type water terminals closed. This process allows the three conditions—valve core positioning, backup branch water supply, and usable water outlet—to be independently verified.

[0107] Example 3: Interlocking of Periodic Freshness Preservation and Water Use Permissions During normal operation of the main purification branch 3, the controller 8 executes the backup branch preservation program every preset time interval. During execution, the inlet water distribution unit 51 allows a small amount of raw water to enter the backup fine filtration branch 4, the outlet water selection unit 52 continues to isolate the backup fine filtration branch 4 from the common outlet 6, and the flushing drain valve 43 is opened. The controller 8 ends the flushing process according to the preset flushing time, cumulative drainage volume, or stable water quality conditions of the backup branch. The preservation period can be dynamically adjusted based on the ambient temperature, the last flushing time, and the water volume in the backup branch.

[0108] The water usage authorization component 10 includes control valves connected to the first type of water terminal 101 and the second type of water terminal 102, respectively. In normal mode, both types of control valves can be opened upon water usage request; in emergency mode, the controller 8 closes the control valve corresponding to the first type of water terminal 101 and allows the second type of water terminal 102 to draw water within the emergency authorization range. The local display alarm component 91 continuously displays "Fine Filtration Emergency Water Supply," and the remote communication module 92 sends the fault type, switching time, backup branch flow rate, and maintenance request to the store management system or operation and maintenance platform.

[0109] In certain application scenarios, where it has been verified that the local raw water and backup fine filtration treatment can meet all target uses, the water usage permission execution component 10 may not be required; instead, only a recognizable emergency status signal may be output. Conversely, in scenarios where the backup finely filtered water is not permitted for any food contact use, the emergency mode can supply water only to restricted pipelines such as those used for cleaning, or close the public water outlet 6. Thus, the equipment's continuous water supply strategy can be adapted to specific hygiene regulations and catering processes.

[0110] Example 4: Fault Recovery and Power Loss Safety like Figure 5 As shown, after maintenance personnel replace the filter element, repair the booster pump 32, or replace the deep purification component 33, they issue a recovery test command via the local or remote interface. The recovery control unit 83 keeps the outlet water selection unit 52 connected to the backup fine filtration branch 4 and the common outlet 6, while simultaneously starting the main purification branch 3 and opening the main branch drain valve 34. The initial produced water from the main purification branch 3 is discharged into the drain pipe.

[0111] When the TDS, desalination rate, pressure, and flow rate of the main branch effluent continuously meet the recovery threshold within the recovery confirmation time t_recover, the recovery control unit 83 closes the main branch drain valve 34 and drives the switching valve assembly 5 back to the first angle. A hysteresis is set between the recovery threshold and the fault threshold. For example, the effluent TDS threshold that triggered the fault is higher than the allowed effluent TDS threshold for recovery, avoiding repeated switching near the critical value. If the same fault recurs within the observation time after switching back, the controller 8 immediately reverts to emergency mode and marks the event as a repeated fault, requiring manual confirmation before allowing recovery again.

[0112] The recovery control unit 83 continuously monitors the water supply status of the backup fine filtration branch throughout the entire recovery confirmation period. If the backup branch malfunctions or any of the recovery parameters of the main branch fails to meet the conditions, the automatic recovery is stopped and the system enters a controlled shutdown or manual confirmation state. After switching back to the first angle, the normal position signal of the position sensor 54, together with the pressure, flow rate, and water quality of the main branch, constitute the conditions for successful recovery.

[0113] The switching valve assembly 5 can employ an actuator with spring return. In scenarios where the equipment requires maintaining process water supply as much as possible during power failure, the return direction is set to the second angle, allowing the backup fine filtration branch 4 to supply water under inlet pressure. In scenarios where the equipment requires priority shutdown during power failure, the return direction is set to the fully closed position. A manual operating part is provided on the outside of the valve body, allowing maintenance personnel to rotate the valve core in the power-off state; the valve position is directly displayed by mechanical markings. Both of the above power failure strategies are optional embodiments of the present invention.

[0114] Example 5: Alternative Structure In addition to reverse osmosis membrane modules, the deep purification components 33 of the main purification branch 3 can also be nanofiltration membrane modules, electro-deionization modules, or multi-stage membrane treatment modules. The backup fine filtration branch 4 can use a combination of PP cotton and activated carbon, microfiltration and activated carbon, ultrafiltration and activated carbon, or include a UV sterilization unit. The backup fine filtration branch 4 can rely on the raw water pressure for water supply, or it can be equipped with a low-pressure backup pump independent of the main booster pump 32.

[0115] The switching valve assembly 5 is not limited to a coaxial ceramic valve plate structure. The inlet water distribution section 51 and the outlet water selection section 52 can each use solenoid valves and be installed in the same integrated valve block, with mutual exclusion ensured by a hardware interlock circuit; alternatively, a multi-way rotary valve core can be used to simultaneously form the inlet water distribution channel and the outlet water selection channel. Any method that can establish a controlled inlet and outlet isolation relationship between the main purification branch 3 and the backup fine filtration branch 4 is acceptable.

[0116] Fault determination can be performed on the local controller 8, or a switching authorization can be generated by the remote platform based on uploaded data. However, to shorten response time and maintain functionality during network interruptions, it is preferable to complete basic fault determination and emergency switching locally, while the remote platform is used for parameter configuration, record analysis, and manual verification.

[0117] This invention uses the geometric correspondence of the same linkage axis to simultaneously determine the raw water inlet allocation and the common outlet selection, forming a fixed state sequence between normal, transition, and emergency positions. In the transition position, both the main branch return water interface and the backup branch return water interface are isolated from the common outlet interface, preventing water from the faulty branch and the initial water from the backup branch from entering the common outlet. Only after the position sensor confirms the emergency position does the controller read the backup branch pressure, flow rate, or water quality and confirm water supply. Its technical effect is not simply reducing the number of valves, but rather transforming the "possible synchronization" dependent on software timing into "state mutual exclusion" determined by channel geometry, and incorporating valve action results into subsequent verification.

[0118] The branch topology that can still supply water in the event of a main pump failure. The inlet of the backup fine filter branch is located upstream of the main booster pump, and the backup fine filter assembly is set independently of the lifespan components of the main branch; this relationship, in conjunction with pump anomaly detection and valve isolation, makes the pump an isolated faulty component, rather than a single point of failure shared by both branches.

[0119] A multi-parameter correspondence is established based on the fault mechanism. Blockage determination is limited by water demand, raw water pressure, and pump operating status, and incorporates differential pressure and flow rate; pump fault determination establishes a correspondence between current / speed and downstream pressure / flow rate. This scheme does not simply list data from multiple sensors side-by-side, but uses physical causal relationships to distinguish between blockage, underpressure, water outage, not started, stalled, and idling.

[0120] The backup branch is first isolated and flushed before being connected to the public water outlet. The backup branch can be periodically kept fresh or pre-filled / flushed while remaining isolated at the water outlet selection point. It is only allowed to switch after the time, volume or water quality conditions have been stabilized, thus solving the problem of stagnant water from long-term unused branches entering the public water outlet.

[0121] The system employs a dual-layer verification process involving both switching actions and water supply results. First, a position sensor confirms that the valve core has reached the emergency position. Then, backup pressure, flow rate, or water quality is used to verify whether the water supply has truly been established. If verification fails, the system switches to a fully closed state instead of continuing to output water of uncertain quality or without pressure.

[0122] The emergency water supply is restored in a closed loop without interruption. After the main branch line is repaired, while the backup branch line continues to supply water to the public water outlet, the water produced by the main branch line first enters the drainage or return flow; it is only switched back if the restoration threshold is met continuously. If the switchback fails, it is reversed and the repeated fault is recorded.

[0123] Water quality grade-driven terminal pipeline interlocking. Emergency fine-filtered water and normal deep-desalinated water have different treatment capacities. Status signals directly drive downstream terminal control valves to prevent fine-filtered water from entering terminals with mandatory desalination requirements.

[0124] The technical effects of this invention stem from the synergy between its features: upstream water intake ensures a backup water source for the branch line in case of pump failure; isolation flushing ensures availability of backup water before it is connected; coaxial transition isolation ensures no water mixing during switching; position and hydraulic verification ensure that control commands have been translated into actual water supply; and failure shutdown and recovery rollback limit the consequences of single-point failures. These effects are not simply the sum of individual features implemented separately, but rather each step provides a safety prerequisite for the next.

[0125] Compared with the prior art, the present invention has at least the following beneficial effects.

[0126] (1) When the main purification branch experiences abnormal TDS, filter blockage, or booster pump failure, it can automatically enter the fine filtration emergency water supply mode after confirming that the backup branch is available, thereby reducing the probability of water outage caused by single-point failure of the water purification equipment in catering establishments.

[0127] (2) The backup fine filtration branch draws water from the upstream of the booster pump and has an independent filtration path. When the main booster pump fails, it can still use the raw water pressure to continue supplying water, and the fault isolation is more thorough.

[0128] (3) The water inlet distribution unit and the water outlet selection unit are linked, which can manage the inlet and outlet of the two branches at the same time during switching, reducing the risk of cross-flow, backflow and fault water mixed into the common water outlet pipeline caused by the asynchronous operation of multiple valves.

[0129] (4) By continuously confirming anomalies, cross-confirming multiple parameters and threshold hysteresis, the false switching and frequent switching caused by start-up and shutdown of stagnant water, instantaneous flow changes or sensor fluctuations can be reduced.

[0130] (5) The backup fine filtration branch can be periodically flushed for freshness preservation and flushed before fault switching, and the pressure, flow rate or water quality can be verified after switching, so that the emergency water supply status can be detected and confirmed.

[0131] (6) By using downgrade status indicators and water use permission interlocking, the difference between emergency fine-filtered water and normal deep-purified water is clearly defined, taking into account both the continuity of water supply to stores and water use safety management.

[0132] (7) The main purification branch after maintenance needs to be pre-flushed and continuously qualified before switching back to the public outlet, and has a failure back-off mechanism to improve the reliability of the fault recovery process.

[0133] (8) The switching valve assembly solidifies the branch inlet selection, branch return water selection and common outlet isolation into the same linkage axis state relationship, and verifies the actual results through valve position signals and hydraulic parameters, so that faults such as single actuator jamming, backup branch blockage or inlet underpressure can be identified and switched to the fully closed state, limiting the consequences of the fault to continue to spread to the common outlet.

[0134] For the specific implementation scheme of this embodiment, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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 device. 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.

[0139] 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 corresponding program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0140] 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.

[0141] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0142] 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.

[0143] The present invention relates to a system, method, apparatus, processor, and computer-readable storage medium for commercial catering water purifiers and their fault-based degraded water supply control. When abnormal effluent quality, filter blockage, or booster pump failure occurs in the main purification branch, the system switches to an independent backup fine filtration branch after cross-verification of multiple parameters. The inlet of the backup branch is located upstream of the booster pump, ensuring continuous water supply using raw water pressure even in the event of a booster pump failure, thereby reducing the risk of overall water outage caused by a single point of failure. The inlet distribution unit and the outlet selection unit are driven by the same linkage shaft and form a dual-path isolation at the transition position, using channel geometry... The system ensures isolation before connection to prevent cross-contamination and contamination of faulty water caused by asynchronous operation of multiple valves. The backup branch is flushed in the isolated state and verified by both valve position signals and pressure and flow parameters after switching to prevent stagnant water from entering the common outlet and to ensure that the emergency water supply status is verifiable. Combined with continuous anomaly confirmation, threshold hysteresis, recovery pre-flushing, and failure rollback mechanisms, it reduces erroneous switching and repeated switching, and improves the reliability of fault recovery. At the same time, by using downgraded status indicators and water use permission interlocks, the emergency water quality level is clearly defined, which improves water safety management and equipment operation reliability while ensuring the continuity of catering water supply.

[0144] In this specification, the invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A system for controlling the water supply of a commercial catering water purifier and its fault degradation, characterized in that, The system includes a casing, a raw water inlet, a common outlet, a main purification branch, a backup fine filtration branch, a detection component, and a controller. The main purification branch includes a main branch filtration component, a booster pump, and a deep purification component. The backup fine filtration branch includes a fine filtration component that is set independently of the main branch filtration component, and the inlet end of the backup fine filtration branch is connected to the water path located upstream of the booster pump. The system also includes a switching valve assembly disposed within the housing. The switching valve assembly includes a valve body, an inlet water distribution section, an outlet water selection section, a linkage actuator, and a position sensor. The valve body is provided with a raw water interface, a main branch inlet water interface, a backup branch inlet water interface, a main branch return water interface, a backup branch return water interface, and a common outlet water interface. The inlet water distribution section and the outlet water selection section are connected to the same linkage shaft and are driven by the linkage actuator. The switching valve assembly has a normal position, an emergency position, a transition position between the normal position and the emergency position, and a fully closed position. In the normal position, the raw water interface is connected to the main branch inlet interface, the main branch return interface is connected to the common outlet interface, and the backup branch return interface is isolated from the common outlet interface. In the emergency position, the raw water interface is connected to the backup branch inlet interface, the backup branch return interface is connected to the common outlet interface, and the main branch return interface is isolated from the common outlet interface. In the transition position, both the main branch return interface and the backup branch return interface are isolated from the common outlet interface. The detection component is used to detect at least two types of parameters among the water quality parameters of the main purification branch, the pressure difference parameters of the filter component, the flow parameters of the main branch, and the electrical parameters and hydraulic response parameters of the booster pump. The controller is connected to the detection component, the linkage actuator and the position sensor respectively, and is used to confirm that at least one of the following faults occurs in the main purification branch: abnormal effluent quality, filter component blockage or booster pump failure, according to the detection parameters corresponding to the fault type. When the backup fine filtration branch meets the activation conditions, the controller drives the switching valve component to switch from the normal position to the emergency position through the transition position. The controller is also configured to, upon receiving the emergency position signal output by the position sensor, confirm whether the downgraded water supply has been established based on at least one of the pressure parameters, flow parameters, or water quality parameters of the backup fine filtration branch, and drive the switching valve assembly to the fully closed position and output a switching failure signal when the emergency position signal is received but the downgraded water supply confirmation condition is not met.

2. The system for realizing commercial catering water purifiers and their fault-based water supply control according to claim 1, characterized in that, The water inlet distribution section includes a first fixed valve plate and a first movable valve plate, and the water outlet selection section includes a second fixed valve plate and a second movable valve plate. The first movable valve plate and the second movable valve plate are fixed on the linkage shaft. The first movable valve plate is provided with a water inlet guide groove, and the second movable valve plate is provided with a water outlet guide groove. The water inlet guide groove and the water outlet guide groove are arranged according to a preset angle relationship, so that when the linkage shaft is in the transition position, the second movable valve plate simultaneously blocks the main branch return water interface and the backup branch return water interface. The angle width of the angle interval corresponding to the transition position is not less than the safety angle width determined according to the positioning error of the linkage actuator, the assembly error of the first moving valve plate and the second moving valve plate, and the allowable wear amount, so that before any branch return water interface starts to connect with the common water outlet interface, the other branch return water interface has been completely isolated from the common water outlet interface.

3. The system for realizing commercial catering water purifiers and their fault-based water supply control according to claim 1, characterized in that, The main branch water inlet is connected to the water inlet of the main purification branch, and the main branch return water inlet is connected to the water production end of the deep purification component; the backup branch water inlet is connected to the water inlet of the backup fine filtration branch, and the backup branch return water inlet is connected to the water outlet of the fine filtration component; the fine filtration component includes at least one of PP cotton filter element, activated carbon filter element, microfiltration component, ultrafiltration component, antibacterial filter element and ultraviolet sterilization unit, and is driven by the pressure of the raw water inlet or by a backup pump independent of the booster pump.

4. The system for realizing commercial catering water purifiers and their fault-based water supply control according to claim 1, characterized in that, The detection components include a raw water TDS sensor and a main branch outlet TDS sensor. The controller calculates the apparent desalination rate R based on the raw water TDS value C_in and the main branch outlet TDS value C_out. When the main branch outlet TDS value C_out is greater than a preset outlet threshold and R is less than a preset desalination rate threshold, and the water quality is confirmed to be abnormal for an extended period until the water quality anomaly confirmation time is reached, the controller confirms the water quality is abnormal. When C_out is greater than a preset safety upper limit, the controller confirms the water quality is abnormal without waiting for the water quality anomaly confirmation time to expire.

5. The system for realizing commercial catering water purifiers and their fault-based water supply control according to claim 1, characterized in that, The detection components include pressure sensors located upstream and downstream of the filter component to be tested, as well as a main branch flow sensor. The controller performs a blockage determination when there is water demand at the common outlet, the raw water inlet pressure is within a preset allowable range, and the booster pump is in operation. When the upstream and downstream pressure difference of the filter component to be tested is greater than a preset pressure difference threshold and the flow rate of the main purification branch is lower than a preset flow rate threshold for an extended period until the blockage confirmation time is reached, the filter component is confirmed to be blocked.

6. The system for realizing commercial catering water purifiers and their fault-based water supply control according to claim 1, characterized in that, The detection components include a pump electrical parameter detector, a pump speed detector, a pre-pump pressure sensor, a post-pump pressure sensor, and a main branch flow sensor. After sending an operation command to the booster pump, the controller establishes a pressure increase observation window and confirms the booster pump malfunction according to at least one of the following correspondences: the pump current is lower than the circuit breaker threshold and the post-pump pressure increment is lower than the booster threshold; the pump current is higher than the overcurrent threshold and the pump speed is lower than the speed threshold; the pump speed reaches the speed threshold but the post-pump pressure increment and the main branch flow are both lower than the corresponding thresholds.

7. The system for realizing commercial catering water purifiers and their fault-based water supply control according to claim 1, characterized in that, The backup fine filtration branch is equipped with a backup branch sensor and a flushing drain valve. Before driving the switching valve assembly, the controller determines whether the raw water inlet pressure, the remaining lifespan of the fine filtration assembly, the internal leakage detection result, and the detection parameters of the backup branch sensor meet the preset activation conditions. When the preset activation conditions are met, the controller connects the backup fine filtration branch to the drainage path until the preset flushing time, preset flushing volume, or preset water quality stability condition is reached, at which point the controller drives the switching valve assembly. During the period when the backup fine filtration branch is connected to the drainage path, the backup branch return water interface remains isolated from the common water outlet interface.

8. The system for realizing commercial catering water purifiers and their fault-based degraded water supply control according to claim 7, characterized in that, After the switching valve assembly reaches the emergency position, the controller closes the flushing drain valve and confirms the establishment of degraded water supply based on the emergency position arrival signal and at least one of the backup branch pressure and backup branch flow.

9. The system for realizing commercial catering water purifiers and their fault-based water supply control according to claim 7, characterized in that, The controller is also used to connect the backup fine filtration branch to the drainage passage for fresh-keeping flushing according to a preset cycle during the normal water supply state of the main purification branch, and to stop flushing after reaching the preset flushing time, preset flushing volume or preset water quality stability condition; the preset cycle is determined according to at least one of the ambient temperature, the last flushing time, and the water storage capacity of the backup branch; during the fresh-keeping flushing, the return water interface of the backup branch is kept isolated from the common water outlet interface.

10. The system for realizing commercial catering water purifiers and their fault-based degraded water supply control according to claim 1, characterized in that, A check valve and a pressure-stabilizing water storage assembly are provided upstream of the common water outlet. The pressure-stabilizing water storage assembly is used to release water to the common water outlet during the transition position of the switching valve assembly to reduce water pressure fluctuations.

11. The system for realizing commercial catering water purifiers and their fault-based degraded water supply control according to claim 1, characterized in that, The system further includes a status output component and a water use permission execution component. The status output component outputs a degraded water supply status signal when the switching valve component is in the emergency position. The water use permission execution component includes control valves respectively installed on the water supply pipelines of the first type of water terminal and the second type of water terminal. The controller closes the control valve of the first type of water terminal in the degraded water supply state and allows the control valve of the second type of water terminal to open under preset authorization conditions.

12. The system for realizing commercial catering water purifiers and their fault-based degraded water supply control according to claim 1, characterized in that, The switching valve assembly further includes an elastic reset mechanism and a manual operating unit; the elastic reset mechanism is used to return the switching valve assembly to the emergency position or the fully closed position when power is lost, and the manual operating unit is used to drive the linkage shaft to rotate in the power-off state, and has mechanical valve position marks corresponding to the normal position, the transition position and the emergency position respectively.

13. A method for controlling the degraded water supply of a commercial catering water purifier during malfunction, wherein the commercial catering water purifier includes a main purification branch, a backup fine filtration branch, and a switching valve assembly having a normal position, a transition position, an emergency position, and a fully closed position; the valve body of the switching valve assembly is provided with a main branch return water interface, a backup branch return water interface, and a common water outlet interface; the common water outlet interface is connected to a common water outlet; and the inlet end of the backup fine filtration branch is connected upstream of the booster pump of the main purification branch, characterized in that... The method includes the following steps: When the switching valve assembly is in the normal position, at least two types of parameters are collected from the following: water quality parameters of the main purification branch, pressure difference parameters of the filter assembly, flow parameters of the main branch, and electrical and hydraulic response parameters of the booster pump. Based on the collected parameters, at least one of the following abnormal indicators is generated under the effective detection conditions corresponding to each parameter: water quality abnormal indicator, blockage abnormal indicator, and pump abnormal indicator. The duration of the generated abnormal indicator is confirmed or repeated sampling is performed. After confirming that the main purification branch has failed, check whether the backup fine filtration branch meets the preset activation conditions. When the preset activation conditions are met, the backup fine filter branch is connected to the drainage passage for pre-filling or flushing. The switching valve assembly is driven from the normal position through a transitional position that isolates both the main branch return water interface and the backup branch return water interface from the common outlet water interface to the emergency position. Upon receiving the emergency location signal, the connection between the backup fine filtration branch and the drainage passage is cut off, and at least one of the backup branch pressure, backup branch flow rate, or backup branch water quality is detected. When the test result meets the downgraded water supply confirmation condition, a downgraded water supply status signal is output; when the test result does not meet the downgraded water supply confirmation condition, the switching valve assembly is turned to the fully closed position and a switching failure signal is output. During the pre-filling or flushing of the backup fine filter branch, the return water interface of the backup branch remains isolated from the common water outlet interface.

14. The method for implementing commercial catering water purifiers and their fault-based degraded water supply control according to claim 13, characterized in that, The water quality anomaly indicator is generated when the TDS value of the main branch outlet water is greater than a preset outlet threshold and the apparent desalination rate is less than a preset desalination rate threshold, or it is generated directly when the TDS value of the main branch outlet water is greater than a preset safety upper limit; the blockage anomaly indicator is generated when the pressure difference between the upstream and downstream of the filter component is greater than a preset pressure difference threshold and the flow rate of the main branch is lower than a preset flow rate threshold; the pump anomaly indicator is generated based on the correspondence between the pump current or pump speed and the pressure increment after the pump and the flow rate of the main branch.

15. The method for implementing commercial catering water purifiers and their fault-based degraded water supply control according to claim 13, characterized in that, After the main purification branch is maintained or the fault condition disappears, keep the backup fine filtration branch connected to the common outlet and allow the produced water from the main purification branch to enter the drainage passage or return passage. When the water quality parameters, pressure parameters, and flow parameters of the main purification branch continuously meet the recovery threshold within the recovery confirmation time, the switching valve assembly is driven to return from the emergency position to the normal position via the transition position; if the fault is confirmed again within the observation time after returning to the normal position, the system is switched back to the emergency position and the repeated fault event is recorded, wherein a hysteresis is set between the recovery threshold and the corresponding fault threshold. While the produced water from the main purification branch enters the drainage passage or return passage, the backup fine filtration branch remains connected to the common outlet.

16. The method for implementing commercial catering water purifiers and their fault-based degraded water supply control according to claim 13, characterized in that, In the downgraded water supply state, an emergency fine-filtered water indicator is output to the local display, remote management platform or downstream water terminals, and the water supply pipeline of the first type of water terminals that have mandatory requirements for deep desalination is shut off, and water is supplied only to the second type of water terminals that meet the preset authorization conditions.

17. The method for implementing commercial catering water purifiers and their fault-based water supply control according to claim 13, characterized in that, During the normal water supply period of the main purification branch, the backup fine filtration branch is connected to the drainage channel for fresh-keeping flushing according to a preset cycle, and the flushing is stopped after the preset flushing time, preset flushing volume, or preset water quality stability condition is reached; the preset cycle is determined based on at least one of the ambient temperature, the last flushing time, and the water storage volume of the backup branch; during the fresh-keeping flushing, the return water interface of the backup branch is kept isolated from the common water outlet interface.

18. A device for controlling the water supply of a commercial catering water purifier and its fault degradation, characterized in that, The device includes: A processor is configured to execute computer-executable instructions; The memory stores one or more computer-executable instructions, which, when executed by the processor, implement the steps of the method for implementing a commercial catering water purifier and its fault-degrading water supply control as described in any one of claims 13 to 17.

19. A processor for implementing commercial catering water purifiers and their fault-based degraded water supply control, characterized in that, The processor is configured to execute computer-executable instructions, which, when executed by the processor, implement the steps of any one of claims 13 to 17 for implementing a commercial catering water purifier and its fault-degrading water supply control method.

20. A computer-readable storage medium, characterized in that, It stores a computer program that can be executed by a processor to implement the steps of the method for implementing a commercial catering water purifier and its fault-degrading water supply control as described in any one of claims 13 to 17.

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