Liquid level water replenishment automatic control system and method based on multi-parameter feedback

Abstract

The present application relates to the technical field of non-electric variable automatic control, and particularly relates to a liquid level water replenishment automatic control system and method based on multi-parameter feedback, which can be applied to a steam generating device with a heating cavity, a water replenishment tank and a heating body, and comprises a water level detection component, a flow detection component, a pressure detection component, a temperature detection component, a water replenishment control valve, a plug-in electrical connection structure, a power regulation circuit and a controller. The controller takes the water level information in the heating cavity as the controlled variable, takes the water replenishment flow output by the water replenishment control valve to the heating cavity as the regulation variable, and controls the water replenishment control valve to switch between the closed water supply state, the continuous small flow water supply state and the large flow water supply state according to the water level information, the water replenishment flow, the water pressure information, the temperature information and the water replenishment tank installation state, so that the liquid level in the heating cavity is kept within the preset working water level range, and the heating power of the heating body is linked and regulated in the water supply abnormality or water shortage dry burning risk state.

Description

Technical Field

[0001] This invention relates to the field of non-electric variable automatic control technology, and in particular to an automatic control system and method for liquid level replenishment based on multi-parameter feedback. Specifically, it can be used in steam generating equipment with a heating chamber to automatically detect and control the liquid level in the heating chamber, the replenishment flow rate, and abnormal water supply conditions. Background Technology

[0002] Equipment involving liquid consumption typically requires automatic control of the liquid level within the heating chamber. Taking steam generators as an example, the water in the heating chamber is continuously consumed during operation. If water is not replenished promptly and accurately, the liquid level can easily fall below the safe range; conversely, excessive replenishment can cause liquid level fluctuations or unstable operation. Therefore, automatic control of the water replenishment process is necessary based on the actual liquid level within the heating chamber.

[0003] Existing steam generating equipment already employs solutions that use water level sensors to obtain heating chamber water level information and control the water supply status of the makeup water control valve based on this information. However, when relying solely on a single water level reading for makeup water control, the controller struggles to promptly determine the actual makeup water flow rate, supply pressure, supply pipeline connection status, and makeup water tank installation status. This can easily lead to problems such as delayed makeup water supply, insufficient makeup water supply, excessive makeup water supply, or failure to promptly identify abnormal water supply conditions.

[0004] For example, when the throttling micro-orifice, filter screen, or water supply pipes are insufficiently replenished due to scale, impurities, or installation deviations, the controller cannot confirm whether the actual replenishment flow rate has reached the target replenishment flow rate if the water supply status is inferred solely based on the valve core position. When the water supply tank is short of water, not properly installed, or the water supply pipe is disconnected, it is difficult to identify the type of water supply abnormality in a timely manner without comprehensive judgment based on water pressure information, flow information, and installation status information.

[0005] Furthermore, in liquid level control scenarios with electric heating functions, changes in the water replenishment status can affect the temperature change trend of the liquid in the heating chamber. When the water replenishment flow is abnormal, the liquid level is lower than the safe level, or the water replenishment tank is not installed properly, if the heating element still maintains a high heating power, it may cause a risk of dry burning.

[0006] Therefore, it is necessary to provide a closed-loop control scheme for liquid level in equipment with liquid consumption processes. The controller uses the water level information in the heating chamber as the controlled variable and the water supply flow rate output from the water supply control valve to the heating chamber as the regulating variable. It also combines water pressure information, temperature information, and the installation status of the water supply tank to perform multi-parameter feedback judgment, thereby realizing automatic control of the liquid level in the heating chamber and linkage protection against abnormal water supply and the risk of dry burning due to water shortage. Summary of the Invention

[0007] To address at least the problems in existing technologies, such as the difficulty in accurately controlling the water replenishment process with a single water level signal, the difficulty in matching the actual water replenishment flow rate with the target liquid level control requirements, and the difficulty in timely identifying abnormal water supply types, this invention aims to provide an automatic liquid level replenishment control system based on multi-parameter feedback.

[0008] To at least solve one of the above-mentioned technical problems in the prior art, the present invention also provides an automatic control method for liquid level replenishment based on multi-parameter feedback.

[0009] The first objective of this invention is achieved as follows:

[0010] An automatic control system for liquid level replenishment based on multi-parameter feedback is applied to a steam generating device with a heating chamber. The steam generating device includes a main body, a water replenishment tank, and a heating element. The heating chamber is provided inside the main body, and the heating element is used to electrically heat the heating chamber.

[0011] The automatic water replenishment control system includes a water level detection device, a flow rate detection device, a pressure detection device, a temperature detection device, at least one water replenishment control valve, a pluggable electrical connection structure, a power regulation circuit, and a controller.

[0012] The main body of the device has a water supply tank installation cavity for accommodating the water supply tank. The water supply tank installation cavity is provided with a water source inlet that communicates with the heating cavity. The water supply tank is provided with a clean water cavity. At least one water supply pipe is provided inside the water supply tank. The water supply pipe is connected between the clean water cavity and the water source inlet. At least one water supply control valve is provided in the corresponding water supply pipe.

[0013] The water level detector is used to detect the water level information in the heating chamber, the flow rate detector is used to detect the water supply flow rate output from the water supply control valve to the heating chamber, the pressure detector is used to detect the water pressure information on the water supply side or the water outlet side of the water supply control valve, and the temperature detector is used to detect the temperature information of the heating chamber and / or the temperature information of the heating element.

[0014] At least one of the water replenishment control valves is electrically connected to the controller via the plug-in electrical connection structure, which is used to detect the installation status of the water replenishment tank.

[0015] The controller is electrically connected to the water level detector, the flow rate detector, the pressure detector, the temperature detector, the water supply control valve, the plug-in electrical connection structure, and the power regulation circuit.

[0016] The controller is used to control the water level information in the heating chamber as the controlled variable and the water supply flow rate output to the heating chamber by the water supply control valve as the regulating variable. Based on the water level information, the water supply flow rate, the water pressure information, the temperature information, and the installation status, the controller controls the water supply control valve to switch between a closed water supply state, a continuous small flow water supply state, and a large flow water supply state, so that the liquid level in the heating chamber is maintained within a preset working water level range.

[0017] The controller is also used to control the heating element to reduce its power, stop heating, or maintain a preset safe power when the water supply state of the water supply control valve is switched, the water supply flow is abnormal, the water pressure information is abnormal, or the water supply tank is not installed in place, through the power adjustment circuit.

[0018] By incorporating water level, flow rate, pressure, and temperature sensors, a pluggable electrical connection structure, a water supply control valve, and a controller, the controller can perform multi-parameter feedback control, using the heating chamber liquid level as the controlled variable and the water supply flow rate as the adjustable variable, while also incorporating actual water supply flow rate, water pressure, temperature information, and the installation status of the water supply tank. This method allows the water supply process to no longer rely solely on a single water level signal, but rather adjusts the water supply status of the water supply control valve according to the actual water supply situation and liquid level changes, thereby improving the accuracy of liquid level water supply control and maintaining the liquid level in the heating chamber within the preset working water level range.

[0019] Furthermore, the water replenishment control valve includes a valve body, a valve core, and a valve core drive component. The valve core drive component is electrically connected to the controller and is used to drive the valve core to switch between a closed position, a continuous low-flow water supply position, and a high-flow water supply position. When the valve core is in the closed position, the water supply pipeline is disconnected. When the valve core is in the continuous low-flow water supply position, the purified water chamber continuously replenishes the heating chamber with a small flow of water via the water replenishment control valve. When the valve core is in the high-flow water supply position, the purified water chamber replenishes the heating chamber with a large flow of water via the water replenishment control valve. Under the same water supply pressure difference, the water supply flow rate corresponding to the high-flow water supply position is more than twice the water supply flow rate corresponding to the continuous low-flow water supply position.

[0020] By including a valve body, a valve core, and a valve core drive component in the water supply control valve, and having the valve core drive component drive the valve core to switch between a closed position, a continuous low-flow water supply position, and a high-flow water supply position, the system can achieve water cut-off, continuous low-flow water supply, and high-flow water supply according to the liquid level control requirements of the heating chamber. At the same time, under the same water supply pressure difference, the water supply flow rate corresponding to the high-flow water supply position is more than twice that corresponding to the continuous low-flow water supply position. This allows the liquid level to be maintained by continuous low-flow water supply when it is within the preset working water level range, and to be quickly replenished when the liquid level is low or the water supply is insufficient, thereby improving the flexibility of liquid level regulation and the water supply response capability.

[0021] Furthermore, the controller is used to determine the operating state of the heating chamber related to the liquid level replenishment control based on the temperature information. The operating state of the heating chamber includes a heating state, a stable steam generation state, or a water shortage and dry burning risk state. When the heating chamber is in the heating state and the water level information is lower than a preset low water level threshold, the controller controls the heating element to reduce power or stop heating, and controls the water replenishment control valve to switch to a high flow water supply state. When the heating chamber is in the stable steam generation state and the water level information is within a preset working water level range, the controller controls the water replenishment control valve to switch to or maintain a continuous low flow water supply state, and controls the heating element to maintain power operation with steam. When the water level information is lower than a preset safe water level threshold and the temperature information is higher than a preset dry burning risk temperature threshold, the controller determines that the heating chamber is in a water shortage and dry burning risk state, and controls the heating element to stop heating.

[0022] By enabling the controller to determine the operating status of the heating chamber related to liquid level replenishment control based on temperature information, and employing different water supply strategies for the replenishment control valve and power protection strategies for the heating element under different states, the system can jointly determine the replenishment demand based on liquid level and temperature information. When the temperature rises and the water level is low, the power is reduced or heating is stopped and a large flow of water is replenished; when the liquid level is within the preset operating water level range, continuous small flow of water is replenished; and heating is stopped when there is a risk of dry burning due to water shortage, thereby improving the safety of liquid level control.

[0023] Furthermore, when the water pressure information is higher than the preset blockage judgment pressure threshold and the water replenishment flow rate is lower than the preset abnormal flow rate threshold, the controller determines that there is a risk of blockage in the water replenishment control valve or the throttling part within the water replenishment control valve used to limit continuous small flow water supply, and controls the heating element to reduce power or stop heating; when the water pressure information is lower than the preset water supply pressure threshold and the water replenishment flow rate is lower than the preset abnormal flow rate threshold, the controller determines that the water replenishment tank is short of water, the water replenishment tank is not installed properly, or the water supply pipeline connection is abnormal, and prohibits the heating element from continuing to work at normal heating power; when the water pressure information is higher than the preset blockage judgment pressure threshold, the water replenishment flow rate is lower than the preset small flow rate lower limit, and the duration of the water replenishment control valve in the continuous small flow water supply state reaches a preset time, the controller determines that there is a risk of blockage in the continuous small flow water supply part of the water replenishment control valve; when the water pressure information is lower than the preset water supply pressure threshold and the water replenishment flow rate is lower than the preset large flow rate lower limit, the controller determines that the water replenishment tank is short of water, the water supply pipeline is disconnected, or the water replenishment tank is not installed properly.

[0024] By identifying different types of water supply anomalies based on the correspondence between water pressure information and water replenishment flow, the controller can determine that there is a risk of blockage in the water replenishment control valve or throttling part when the water pressure is high but the water replenishment flow is insufficient. When the water pressure is low and the water replenishment flow is insufficient, it can determine that the water replenishment tank is short of water, the water replenishment tank is not installed properly, or the water supply pipeline connection is abnormal. Based on the identification results, the controller can limit the heating element from continuing to work at normal heating power, thereby solving the problem that it is impossible to identify the real cause of insufficient water replenishment by simply inferring the water supply status based on the valve core position.

[0025] Furthermore, during the process of switching from continuous low-flow water replenishment to high-flow water replenishment, when the controller is preparing to switch the water replenishment control valve from continuous low-flow water supply to high-flow water supply, the controller first reduces the heating power of the heating element to a preset water replenishment protection power, and after a preset buffer time, controls the water replenishment control valve to switch to high-flow water supply. After the high-flow water replenishment ends, the controller determines the water replenishment termination condition based on the temperature information, the water level information, and the water replenishment flow rate. After the water replenishment termination condition is met, the controller controls the water replenishment control valve to switch to continuous low-flow water supply or shut off the water supply, and controls the heating element to gradually recover from the preset water replenishment protection power to the steam holding power or the target heating power according to a preset power ramp rate.

[0026] Before the water supply control valve switches from a continuous low-flow water supply state to a high-flow water supply state, the heating power of the heating element is reduced to the preset water supply protection power. After a preset buffer time, the water supply control valve is then switched to the high-flow water supply state. This ensures that the heating element is in a safe and stable heating power state before the high-flow water enters the heating chamber. After the high-flow water supply ends, the water supply termination conditions are determined based on temperature information, water level information, and water supply flow rate. The heating element is then controlled to gradually recover to the steam holding power or target heating power according to the preset power ramp rate. This ensures that the heating element power regulation serves the safety protection during the liquid level water supply state switching process.

[0027] Furthermore, the controller determines the evaporation capacity of the heating element based on at least one of the following: the current heating power of the heating element, the temperature information of the heating chamber, the temperature change trend, the preset thermal efficiency parameter, or the factory calibration parameter. The evaporation capacity is used as a liquid level replenishment control parameter. Based on the evaporation capacity, the controller determines the target replenishment flow rate or valve core holding time under the continuous low-flow water supply condition. The controller stores an evaporation capacity calibration table, which includes at least the correspondence between heating power, heating chamber temperature range, temperature change trend, and target replenishment flow rate. Based on the evaporation capacity calibration table, the controller determines the target replenishment flow rate under the continuous low-flow water supply condition and controls the valve core holding time, valve core position, or opening frequency of the replenishment control valve based on the target replenishment flow rate.

[0028] By enabling the controller to determine the evaporation capacity of the heating element based on the current heating power of the heating element, the temperature information of the heating chamber, the temperature change trend, the preset thermal efficiency parameters, or the factory calibration parameters, and using the evaporation capacity as the liquid level replenishment control parameter, continuous low-flow replenishment is no longer based solely on a fixed valve opening time or a fixed valve core position, but can instead determine the target replenishment flow rate by combining the current liquid consumption situation, thereby improving the liquid level control accuracy during the continuous low-flow replenishment stage.

[0029] Furthermore, the pluggable electrical connection structure includes a power supply terminal, an installation detection terminal, a control signal terminal, and a feedback signal terminal. When the water supply tank is installed in the water supply tank mounting cavity, the power supply terminal, the installation detection terminal, the control signal terminal, and the feedback signal terminal are respectively turned on, enabling the water supply control valve to obtain power supply, control signal, and position feedback signal. The controller only allows the heating element to enter normal heating power when it detects that the installation detection terminal is turned on and receives the execution feedback signal or position feedback signal from the water supply control valve. Otherwise, the controller prohibits the water supply control valve from opening and controls the heating element to stop heating or maintain a preset safe power. The power adjustment circuit includes at least one of a relay power adjustment circuit, a thyristor power adjustment circuit, a PWM power adjustment circuit, or a voltage adjustment circuit. The controller adjusts the actual heating power of the heating element by controlling the power adjustment circuit.

[0030] By configuring the pluggable electrical connection structure to include power supply terminals, installation detection terminals, control signal terminals, and feedback signal terminals, the water replenishment control valve can not only receive power supply and control signals after the water replenishment tank is installed, but also provide feedback to the controller on the position or control execution status of the water replenishment control valve. The controller only allows the heating element to enter normal heating power when it detects that the installation detection terminal is conducting and receives the execution feedback signal or position feedback signal from the water replenishment control valve. Otherwise, it prohibits the water replenishment control valve from opening and controls the heating element to stop heating or maintain it at a preset safe power, thereby improving the reliability of the safety interlock between the water replenishment tank installation status and the liquid level water replenishment control.

[0031] Furthermore, the water replenishment control valve is used to establish the continuous low-flow water supply state and the high-flow water supply state. The valve body of the water replenishment control valve has an inlet and an outlet. A valve core moving area is formed within the valve body. The valve body also has a first throttling channel and a second throttling channel. One end of the first throttling channel is connected to the valve core moving area, and the other end is connected to the outlet. Similarly, one end of the second throttling channel is connected to the valve core moving area, and the other end is connected to the outlet. The minimum flow cross-sectional area of ​​the second throttling channel is smaller than that of the first throttling channel. The minimum flow cross-sectional area of ​​the flow channel; the second throttling channel is provided with a mounting base, the mounting base forming an installation channel, the installation channel in which a throttling component is detachably assembled, the throttling component including a ceramic throttling plate and an annular sealing ring, the ceramic throttling plate having at least one micropore for limiting the continuous small flow rate of water supply; the mounting base is provided with a detachable filter screen on the upstream side of the ceramic throttling plate, the filter screen and the ceramic throttling plate forming a dirt collection chamber, the valve body having a drain channel corresponding to the dirt collection chamber, the drain channel having a drain port, the drain port being closed by a detachable plug.

[0032] By setting a first throttling channel and a second throttling channel within the water replenishment control valve, and making the minimum flow cross-sectional area of ​​the second throttling channel smaller than that of the first throttling channel, the water replenishment control valve can stably replenish water through the second throttling channel under continuous low-flow water supply conditions, and improve water supply capacity through the first and second throttling channels under high-flow water supply conditions. At the same time, the second throttling channel is equipped with a detachable throttling component, a ceramic throttling plate, an annular sealing ring, a filter screen, a dirt collection chamber, and a drain channel, which can limit the continuous low-flow water supply and reduce the entry of impurities or scale into the micropores and cause blockage, thereby improving the reliability of water supply and the convenience of maintenance in the liquid level replenishment control process.

[0033] The second objective of this invention is achieved as follows:

[0034] An automatic control method for liquid level replenishment based on multi-parameter feedback is applied to a steam generating device with a heating chamber. The steam generating device includes a main body, a water replenishment tank, a heating element, a water level detection device, a temperature detection device, at least one water replenishment control valve, a power regulation circuit, a flow detection device, a pressure detection device, a pluggable electrical connection structure, and a controller. The method includes the following steps:

[0035] S1. Obtain water level information in the heating chamber through water level detection device, obtain water supply flow rate output to the heating chamber by water supply control valve through flow detection device, obtain water pressure information on the supply side or outlet side of water supply control valve through pressure detection device, obtain temperature information of heating chamber and / or temperature information of heating element through temperature detection device, and obtain water supply tank installation status through plug-in electrical connection structure.

[0036] S2. The controller uses the water level information in the heating chamber as the controlled variable and the water supply flow rate output from the water supply control valve to the heating chamber as the regulating variable to determine the water supply requirement of the heating chamber based on the water level information.

[0037] S3. The controller controls the water supply control valve to switch between a closed water supply state, a continuous small flow water supply state, and a large flow water supply state according to the water supply demand, the water supply flow rate, the water pressure information, the temperature information, and the installation status, so that the liquid level in the heating chamber is maintained within the preset working water level range.

[0038] S4. When the water supply tank is not installed properly, the water supply control valve is abnormal, or the heating chamber is at risk of dry burning due to lack of water, the controller controls the water supply control valve to switch to the water supply off state or the high flow water supply state, and controls the heating element to stop heating, reduce power, or maintain the preset safe power through the power adjustment circuit.

[0039] By providing an automatic liquid level replenishment control method based on multi-parameter feedback, the controller sequentially acquires water level information, replenishment flow rate, water pressure information, temperature information, and the installation status of the replenishment tank. Using water level information as the controlled variable and replenishment flow rate as the regulating variable, the controller switches the replenishment control valve between a closed water supply state, a continuous low-flow water supply state, and a high-flow water supply state, thereby maintaining the liquid level in the heating chamber within a preset working water level range. When the replenishment tank is detected as not being installed properly, the replenishment control valve is supplying water abnormally, or there is a risk of dry burning in the heating chamber due to water shortage, the controller promptly controls the replenishment control valve and the heating element to enter the corresponding protection state, which helps improve the accuracy of liquid level control and operational safety.

[0040] Furthermore, when the water pressure is higher than the preset blockage judgment pressure threshold and the water supply flow is lower than the preset abnormal flow threshold, the controller determines that there is a risk of blockage in the water supply control valve or throttling component, and controls the heating element to reduce power or stop heating; when the water pressure is lower than the preset water supply pressure threshold and the water supply flow is lower than the preset abnormal flow threshold, the controller determines that the water supply tank is short of water, the water supply tank is not installed properly, or the water supply pipeline connection is abnormal, and prohibits the heating element from continuing to work at normal heating power.

[0041] When the controller prepares to switch the water supply control valve from continuous low-flow water supply to high-flow water supply, the controller first reduces the heating power of the heating element to the preset water supply protection power, and after a preset buffer time, controls the water supply control valve to switch to high-flow water supply. The controller determines the evaporation capacity of the heating element based on at least one of the following: the current heating power of the heating element, the temperature information of the heating chamber, the temperature change trend, the preset thermal efficiency parameter, or the factory calibration parameter. The evaporation capacity is used as the liquid level water supply control parameter, and the target water supply flow rate or valve core holding time under the continuous low-flow water supply state is determined based on the evaporation capacity. After the high-flow water supply ends, the controller controls the heating element to gradually restore from the preset water supply protection power to the steam holding power or the target heating power based on the temperature information and water level information. When the controller does not detect that the water supply tank is installed in place, or does not receive the execution feedback signal or position feedback signal of the water supply control valve, the controller prohibits the water supply control valve from opening and controls the heating element to stop heating or maintain at the preset safe power.

[0042] By further defining steps in the control method, such as identifying abnormal flow and pressure, pre-reducing power before water replenishment, determining continuous low-flow water replenishment parameters based on the evaporation capacity of the heating element, gradually increasing and restoring power after high-flow water replenishment, and providing feedback or position feedback protection for water replenishment tank installation and water replenishment control valve execution, the controller can take more targeted protective measures according to different abnormal causes, and ensure that the power of the heating element remains stable before, during, and after water replenishment, thereby improving the accuracy and safety of liquid level water replenishment control.

[0043] Furthermore, the controller determines the target water replenishment flow rate under continuous low-flow water supply conditions based on the evaporation capacity of the heating element, compares the target water replenishment flow rate with the actual water replenishment flow rate detected by the flow detection device, and corrects the water supply status of the water replenishment control valve and / or the heating power of the heating element based on the comparison result.

[0044] By determining the target replenishment flow rate under continuous low-flow water supply conditions based on the evaporation capacity of the heating element, and comparing the target replenishment flow rate with the actual replenishment flow rate detected by the flow sensor, the controller can determine whether the current continuous low-flow water supply meets the liquid level control requirements. When the actual replenishment flow rate is too low, the controller can promptly adjust the water supply status of the replenishment control valve or reduce the heating power of the heating element to avoid insufficient water replenishment leading to low liquid level or the risk of dry burning. When the actual replenishment flow rate is too high, the controller can reduce the replenishment amount or shut off the water supply to avoid excessive water replenishment causing liquid level fluctuations. This improves the replenishment accuracy and liquid level control stability during the continuous low-flow replenishment phase.

[0045] Furthermore, the controller determines the liquid level deviation based on the deviation between the current water level information and the preset working water level range, determines the flow rate deviation based on the deviation between the target water supply flow rate and the actual water supply flow rate, and corrects the valve core position, valve core holding time, or water supply control valve opening frequency of the water supply control valve based on the changing trends of the liquid level deviation, the flow rate deviation, and the temperature information.

[0046] The liquid level deviation is determined based on the deviation between the current water level information and the preset working water level range. The flow rate deviation is determined based on the deviation between the target water supply flow rate and the actual water supply flow rate. The valve core position, valve core holding time, or opening frequency of the water supply control valve are corrected in combination with the temperature information change trend. This allows the controller to dynamically adjust the water supply status according to the liquid level deviation, flow rate deviation, and liquid consumption trend in the heating chamber. This avoids problems such as water supply lag, excessive water supply, or insufficient water supply caused by single water level threshold control, thereby improving the accuracy of liquid level water supply control, liquid level stability, and operational safety.

[0047] Beneficial effects

[0048] (1) The present invention forms a multi-parameter feedback automatic control system for water level replenishment by setting water level detection device, flow rate detection device, pressure detection device, temperature detection device, plug-in electrical connection structure, water replenishment control valve and controller, with the water level in the heating chamber as the controlled variable and the water replenishment flow rate as the adjustable variable. The controller can control the water supply state of the water replenishment control valve according to the actual water level, actual water replenishment flow rate, water pressure information on the supply side or outlet side and the installation status of the water replenishment tank, thereby improving the water level replenishment control accuracy and keeping the water level in the heating chamber within the preset working water level range.

[0049] (2) The present invention enables the water supply control valve to switch between the water supply closed state, the continuous small flow water supply state and the large flow water supply state, and enables the controller to determine the water supply demand based on the water level information of the heating chamber, the water supply flow rate and the water pressure information. This allows the system to maintain continuous small flow water supply when the liquid level is within the preset working water level range, perform large flow water supply when the liquid level is below the preset low water level threshold, and shut off the water supply when the liquid level reaches the preset high water level threshold, thereby reducing liquid level fluctuations and improving the stability of liquid level control.

[0050] (3) The present invention detects the water supply flow and water pressure information through flow detection device and pressure detection device, so that the controller can identify the risk of blockage of water supply control valve, blockage of throttling component, water shortage in water supply tank, water supply tank not installed properly or abnormal connection of water supply pipeline according to water pressure information and water supply flow. Based on the abnormality type, the water supply status of water supply control valve and / or limit the heating power of heating element are corrected, thereby solving the problem that the true water supply status cannot be judged by simply relying on the valve core position. This is beneficial to improve the ability to identify water supply abnormalities and reduce the risk of dry burning caused by abnormal liquid level.

[0051] (4) Before large-flow water replenishment, the present invention controls the heating element to be reduced to the preset water replenishment protection power, and after the large-flow water replenishment is completed, it is gradually restored to the steam holding power or the target heating power according to the preset power ramp rate, so that the power adjustment of the heating element serves the safety protection during the liquid level water replenishment state switching process; at the same time, the target water replenishment flow rate or valve core holding time under the continuous small-flow water supply state is determined according to the current heating power of the heating element, the heating chamber temperature information, the temperature change trend, the preset thermal efficiency parameters or the factory calibration parameters, so that the water replenishment flow rate can match the liquid level change trend, thereby improving the stability and safety of liquid level water replenishment control.

[0052] (5) The present invention determines the liquid level deviation based on the deviation between the current water level information and the preset working water level range, determines the flow rate deviation based on the deviation between the target water replenishment flow rate and the actual water replenishment flow rate, and corrects the valve core position, valve core holding time or opening frequency of the water replenishment control valve in combination with the temperature information change trend, so that the controller can dynamically adjust the water replenishment state according to the liquid level deviation, flow rate deviation and liquid consumption trend in the heating chamber, avoid water replenishment lag, excessive water replenishment or insufficient water replenishment caused by single water level threshold control, thereby improving the liquid level water replenishment control accuracy, liquid level stability and operation safety. Attached Figure Description

[0053] Figure 1 This is a structural block diagram of the automatic liquid level replenishment control system based on multi-parameter feedback of the present invention.

[0054] Figure 2 This is a flowchart illustrating the automatic liquid level replenishment control method of the present invention.

[0055] Figure 3 This is a schematic diagram of the water supply anomaly identification process based on flow and pressure feedback according to the present invention.

[0056] Figure 4 This is a schematic diagram of the power linkage protection timing during the liquid level replenishment state switching process of the present invention.

[0057] Figure 5 This is a schematic diagram of the pluggable electrical connection structure between the water supply tank and the main body of the device according to the present invention.

[0058] Figure 6 This is a schematic diagram of an electric steamer.

[0059] Figure 7 This is a schematic diagram of the electric steamer from another angle (the water tank is in a separated state).

[0060] Figure 8 This is an exploded view of an electric steamer.

[0061] Figure 9 This is an exploded view of the main body of the electric steamer.

[0062] Figure 10 This is a schematic diagram of the water replenishment tank.

[0063] Figure 11 This is a schematic diagram of the water tank from another angle.

[0064] Figure 12 This is a cross-sectional view of the water supply tank.

[0065] Figure 13 This is a schematic diagram of a water supply control valve (the valve core is in the closed position).

[0066] Figure 14 for Figure 13 Enlarged schematic diagram of part A.

[0067] Figure 15 This is a schematic diagram of a water supply control valve (the valve core is in the position of continuous low-flow water supply).

[0068] Figure 16 This is a schematic diagram of a water supply control valve (the valve core is in the high-flow-rate position). Detailed Implementation

[0069] The present invention will be further described below with reference to embodiments. It should be understood that the following embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Where there is no conflict, the technical features in the following embodiments can be combined with each other.

[0070] Example 1, combined with Figures 1 to 16As shown, this embodiment provides an automatic liquid level replenishment control system based on multi-parameter feedback. This automatic liquid level replenishment control system can be applied to steam generating equipment with a heating chamber, and is used to automatically control the liquid level replenishment process of the heating chamber based on water level information, replenishment flow rate, water pressure information, temperature information, and the installation status of the replenishment tank. The steam generating equipment in this embodiment can be an electric steamer, electric steam pot, steam cleaning equipment, steam care equipment, or other equipment that generates steam through electric heating and requires control of the liquid level in the heating chamber. For ease of explanation, this embodiment uses an electric steamer as an example.

[0071] The steam generating equipment includes a main body 9, a water supply tank 10, at least one water supply control valve 1, a heating element 92, a water level detector 103, a temperature detector 104, a flow rate detector 303, a pressure detector 304, a power regulation circuit 500, a pluggable electrical connection structure 600, and a controller 93. The main body 9 has a heating chamber 91 for holding water to be evaporated. The heating element 92 is located in the bottom or side area of ​​the heating chamber 91 and is used to electrically heat the water within the heating chamber 91.

[0072] In this embodiment, the heating element 92 can be an electric heating tube, a thick-film heating element, an electric heating film, a PTC heating element, or other electric heating elements. The power adjustment circuit 500 is electrically connected to the heating element 92 and is used to adjust the actual heating power of the heating element 92 under the control of the controller 93. The power adjustment circuit 500 can be at least one of a relay power adjustment circuit, a thyristor power adjustment circuit, a PWM power adjustment circuit, or a voltage adjustment circuit.

[0073] A water level detection element 103 is disposed in the heating cavity 91 or in a water level detection channel communicating with the heating cavity 91, and is used to detect the water level information in the heating cavity 91. The water level detection element 103 can be a capacitive water level detection element, a float-type water level detection element, an electrode-type water level detection element, a pressure-type water level detection element, or a photoelectric water level detection element. In this embodiment, the water level information is used to characterize the liquid level height in the heating cavity 91, and the liquid level and water level have the same meaning when the heating cavity 91 contains water. A temperature detection element 104 is disposed at the bottom of the heating cavity 91, on the side wall of the heating cavity 91, near the heating element 92, or on the body of the heating element 92, and is used to detect the temperature information of the heating cavity 91 and / or the temperature information of the heating element 92. The temperature detection element 104 can be an NTC temperature sensor, a PTC temperature sensor, a thermocouple, or a thermistor.

[0074] The main body 9 of the equipment has a water supply tank mounting cavity 94 for accommodating the water supply tank 10. The water supply tank mounting cavity 94 is provided with a water source inlet 911 that communicates with the heating chamber 91. The water supply tank 10 is detachably installed into the water supply tank mounting cavity 94. The water supply tank 10 is provided with a clean water chamber 101, and at least one water supply pipe 30 is provided inside the water supply tank 10, which connects the clean water chamber 101 and the water source inlet 911. A water supply control valve 1 is provided in the corresponding water supply pipe 30 and is used to control the on / off state of the water supply pipe 30 and the water supply flow rate.

[0075] A flow detection element 303 is located downstream of the water supply port of the water supply control valve 1, downstream of the water supply pipeline 30, or near the water source inlet 911, and is used to detect the water supply flow rate output from the water supply control valve 1 to the heating chamber 91. A pressure detection element 304 is located on the inlet or outlet side of the water supply control valve 1 and is used to detect the water pressure information on the supply or outlet side of the water supply control valve 1. By simultaneously setting the flow detection element 303 and the pressure detection element 304, the controller 93 can distinguish between risks of blockage, water shortage, pipeline disconnection, and water supply tank not being installed, rather than simply inferring the water supply status based on the valve core position.

[0076] A pluggable electrical connection structure 600 is disposed between the water supply tank 10 and the main body 9 of the equipment. The pluggable electrical connection structure 600 includes a power supply terminal 601, an installation detection terminal 602, a control signal terminal 603, and a feedback signal terminal 604. The power supply terminal 601 is used to supply power to the valve core drive component 4 of the water supply control valve 1; the installation detection terminal 602 is used to provide feedback to the controller 93 on whether the water supply tank 10 is installed in place; the control signal terminal 603 is used to transmit control signals to the water supply control valve 1; and the feedback signal terminal 604 is used to provide feedback to the controller 93 on the valve core position, drive status, or execution status of the water supply control valve 1.

[0077] In one embodiment, the installation detection terminal 602 can provide feedback to the controller 93 on whether the water tank 10 is installed in place through short-circuit detection, level detection, or switch detection; the feedback signal terminal 604 can provide feedback to the controller 93 on the execution position signal of the valve core drive 4, the position detection signal of the valve core 3, or the drive current feedback signal.

[0078] When the water supply tank 10 is installed in the water supply tank mounting cavity 94, the power supply terminal 601, the installation detection terminal 602, the control signal terminal 603, and the feedback signal terminal 604 are respectively turned on, enabling the water supply control valve 1 to receive power, control signals, and position feedback signals. When the water supply tank 10 is removed from the water supply tank mounting cavity 94 or is not installed in place, the installation detection terminal 602 is disconnected, and the controller 93 prevents the water supply control valve 1 from opening and prevents the heating element 92 from entering normal heating power. This prevents the heating element 92 from operating at normal power when the water supply tank 10 is not installed in place.

[0079] The water supply control valve 1 includes a valve body 2, a valve core 3, and a valve core drive component 4. In one embodiment, the valve core 3 is provided with a first sealing part 31 and a second sealing part 32. The first sealing part 31 is used to control the connection or disconnection between the first throttling channel 24 and the valve core moving area 23, and the second sealing part 32 is used to control the connection or disconnection between the second throttling channel 25 and the valve core moving area 23. The first sealing part 31 includes a first sealing end 311 and a first spring 312. The first spring 312 abuts between the valve core 3 and the first sealing end 311 and is used to give the first sealing end 311 a spring force toward closing the first throttling channel 24. The second sealing part 32 includes a second sealing end 321 and a second spring 322. The second spring 322 abuts between the valve core 3 and the second sealing end 321 and is used to give the second sealing end 321 a spring force toward closing the second throttling channel 25. Therefore, during the switching process of valve core 3, the first sealing end 311 and the second sealing end 321 can form a reliable sealing cooperation with the first throttling channel 24 or the second throttling channel 25 under the action of the corresponding spring, thereby improving the sealing reliability and water supply stability of water supply control valve 1 when switching between water supply closed state, continuous small flow water supply state and large flow water supply state.

[0080] The valve core drive unit 4 is electrically connected to the controller 93 and is used to drive the valve core 3 to switch between the closed position, the continuous low-flow water supply position, and the high-flow water supply position. Figure 13 As shown, when valve core 3 is in the closed position, water supply pipe 30 is in the disconnected state; Figure 15 As shown, when valve core 3 is in the continuous low-flow water supply position, the clean water chamber 101 continuously supplies a small flow of water to the heating chamber 91 via the water replenishment control valve 1; as Figure 16 As shown, when the valve core 3 is in the high-flow water supply position, the clean water chamber 101 supplies a large flow of water to the heating chamber 91 through the water replenishment control valve 1.

[0081] Under the same water supply pressure differential, the water supply flow rate corresponding to a high-flow-rate water supply location is more than twice that of a continuous low-flow-rate water supply location. For example, the water supply flow rate at a continuous low-flow-rate water supply location can be 5 mL / min to 60 mL / min, while the water supply flow rate at a high-flow-rate water supply location can be 80 mL / min to 500 mL / min.

[0082] In one embodiment, the valve body 2 has an inlet 21 and an outlet 22, and a valve core moving area 23 is formed inside the valve body 2. The valve body 2 also has a first throttling channel 24 and a second throttling channel 25. One end of the first throttling channel 24 is connected to the valve core moving area 23, and the other end of the first throttling channel 24 is connected to the outlet 22. One end of the second throttling channel 25 is connected to the valve core moving area 23, and the other end of the second throttling channel 25 is connected to the outlet 22. The minimum flow cross-sectional area of ​​the second throttling channel 25 is smaller than the minimum flow cross-sectional area of ​​the first throttling channel 24.

[0083] like Figure 15 As shown, when valve core 3 is in the continuous low-flow water supply position, valve core 3 blocks the connection between the first throttling channel 24 and the valve core moving area 23, and connects the inlet 21 to the supply port 22 via the second throttling channel 25; Figure 16 As shown, when the valve core 3 is in the high-flow water supply position, the inlet 21 is connected to the water supply port 22 via the first throttling channel 24 and the second throttling channel 25. The second throttling channel 25 is provided with a mounting base 5, which forms an installation channel 51. A throttling component 6 is detachably mounted within the installation channel 51. The throttling component 6 includes a ceramic throttling plate 61 and an annular sealing ring 62. The ceramic throttling plate 61 has at least one micropore 63. A detachable filter screen 52 is provided on the upstream side of the ceramic throttling plate 61 on the mounting base 5. A dirt collection chamber 512 is formed between the filter screen 52 and the ceramic throttling plate 61. The valve body 2 has a drain channel 27 corresponding to the dirt collection chamber 512. The drain channel 27 has a drain outlet, which is closed by a detachable plug 271.

[0084] The controller 93 in this embodiment is used to perform multi-parameter feedback liquid level replenishment control. The controller 93 uses the water level information in the heating chamber 91 as the controlled variable, the replenishment flow rate output from the replenishment control valve 1 to the heating chamber 91 as the regulating variable, and combines water pressure information, temperature information, and the installation status of the replenishment tank 10 to perform feedback control on the water supply status of the replenishment control valve 1, so that the liquid level in the heating chamber 91 is maintained within the preset working water level range.

[0085] The controller 93 first obtains the current water level information through the water level detection element 103, obtains the water replenishment flow rate through the flow detection element 303, obtains the water pressure information through the pressure detection element 304, obtains the current temperature information through the temperature detection element 104, and obtains the installation status of the water replenishment tank and the control signal feedback of the water replenishment control valve through the plug-in electrical connection structure 600.

[0086] The controller 93 determines the water replenishment requirement based on the current water level information. The water replenishment requirement includes no water replenishment, low-flow water replenishment, and high-flow water replenishment. When the water level information is lower than the preset low water level threshold, the controller 93 determines that the water replenishment requirement is high-flow water replenishment; when the water level information is within the preset working water level range, and the temperature information indicates that the heating chamber 91 is in a stable steam generation state, the controller 93 determines that the water replenishment requirement is low-flow water replenishment; when the water level information reaches the preset high water level threshold, the controller 93 determines that the water replenishment requirement is no water replenishment.

[0087] The preset safe water level threshold, preset low water level threshold, preset working water level range, and preset high water level threshold can be pre-calibrated based on the water capacity of the heating cavity 91, the installation height of the heating element 92, the rated power of the heating element 92, and the minimum allowable coverage water level. The preset safe water level threshold is lower than the preset low water level threshold, the preset low water level threshold is lower than the lower limit of the preset working water level range, and the preset high water level threshold is higher than the upper limit of the preset working water level range.

[0088] The controller 93 determines the operating state of the heating chamber related to the liquid level replenishment control based on temperature information. The operating states of the heating chamber include a heating state, a stable steam generation state, and a water shortage and dry-burning risk state. In one embodiment, when the current temperature value is lower than the target temperature value and the temperature change trend indicates that the temperature is continuously rising, the controller 93 determines that the heating chamber 91 is in a heating state; when the current temperature value is within the preset steam generation temperature range, the temperature change trend is within the stable range, and the current water level value is within the preset working water level range, the controller 93 determines that the heating chamber 91 is in a stable steam generation state; when the current water level value is lower than the preset safe water level threshold and the current temperature value is higher than the preset dry-burning risk temperature threshold, the controller 93 determines that the heating chamber 91 is in a water shortage and dry-burning risk state.

[0089] like Figure 3 As shown, the controller 93 determines the type of water supply anomaly based on the water replenishment flow rate and water pressure information. The continuous low-flow water supply component may include at least one of the following: the second throttling channel 25, the filter screen 52, and the micropores 63 of the ceramic throttling vane 61. When the water pressure information is higher than the preset blockage judgment pressure threshold and the water replenishment flow rate is lower than the preset abnormal flow rate threshold, it indicates that there is pressure on the water supply side of the water replenishment control valve 1, but the actual amount of water passing through the water replenishment control valve 1 is insufficient. The controller 93 determines that there is a risk of blockage in the water replenishment control valve 1, the second throttling channel 25, the micropores 63 of the ceramic throttling vane 61, or the filter screen 52, and controls the heating element 92 to reduce its power or stop heating. If necessary, the controller 93 can control the water replenishment control valve 1 to switch to a high-flow water supply state to utilize the first throttling channel 24 to provide temporary water replenishment capacity.

[0090] When the water pressure information is lower than the preset water supply pressure threshold and the water replenishment flow rate is lower than the preset abnormal flow rate threshold, it indicates that the water supply side of the water replenishment control valve 1 lacks an effective water source or the pipeline is not effectively connected. The controller 93 determines that the water replenishment tank 10 is short of water, the water replenishment tank 10 is not installed in place, or the water supply pipeline 30 is abnormally connected, and prohibits the heating element 92 from continuing to work at normal heating power.

[0091] Furthermore, when the installation detection terminal 602 is not conductive, the controller 93 prioritizes determining that the water supply tank 10 is not installed properly; when the installation detection terminal 602 is conductive, but the water pressure information is lower than the preset water supply pressure threshold and the water supply flow is lower than the preset abnormal flow threshold, the controller 93 determines that the water purification chamber 101 is short of water or the water supply pipe 30 is abnormally connected, and prohibits the heating element 92 from continuing to work at normal heating power.

[0092] If the detection terminal 602 is simultaneously detected to be disconnected, the controller 93 will first determine that the water supply tank 10 is not properly installed. If the detection terminal 602 is conductive but the water pressure and flow rate are both low, the controller 93 will determine that the water purification chamber 101 is short of water or that the water supply pipe 30 is abnormal.

[0093] When the installation detection terminal 602 is on, the feedback signal terminal 604 indicates that the water replenishment control valve 1 has been executed, and the water pressure information is higher than the preset blockage judgment pressure threshold but the water replenishment flow rate is lower than the preset abnormal flow rate threshold, the controller 93 prioritizes determining that there is a risk of blockage in the continuous low flow water supply section; when the installation detection terminal 602 is not on, the controller 93 prioritizes determining that the water replenishment tank 10 is not installed properly; when the installation detection terminal 602 is on but the water pressure information and the water replenishment flow rate are both lower than the corresponding thresholds, the controller 93 determines that the water replenishment tank 10 is short of water or that the water supply pipe 30 is abnormally connected.

[0094] In one embodiment, the preset blockage judgment pressure threshold, preset water supply pressure threshold, preset abnormal flow threshold, preset low flow lower limit and preset high flow lower limit can be predetermined based on the calibrated flow of the water supply control valve 1 and the design water pressure range of the water supply pipeline 30, and stored in the controller 93.

[0095] For example, when the calibrated water supply flow rate at a continuous low-flow water supply location is 5 mL / min to 60 mL / min, the preset low-flow lower limit can be set to 50% to 80% of the calibrated low-flow lower limit at the continuous low-flow water supply location; when the calibrated water supply flow rate at a high-flow water supply location is 80 mL / min to 500 mL / min, the preset high-flow lower limit can be set to 50% to 80% of the calibrated low-flow lower limit at the high-flow water supply location. The preset blockage judgment pressure threshold is used to judge the state where there is water pressure on the water supply side of the water supply control valve 1 but the actual water supply is insufficient, and the preset water supply pressure threshold is used to judge the state where the water supply tank 10 is short of water, the water supply tank 10 is not installed properly, or the water supply pipe 30 is abnormally connected.

[0096] like Figure 4 As shown, in terms of high-flow-rate water supply control, when the controller 93 prepares to switch the water supply control valve 1 from a continuous low-flow-rate water supply state to a high-flow-rate water supply state, the controller 93 first reduces the heating power of the heating element 92 to a preset water supply protection power, and then controls the water supply control valve 1 to switch to the high-flow-rate water supply state after a preset buffer time. The preset water supply protection power can be less than the steam holding power, for example, 20% to 60% of the rated power. The preset buffer time can be 0.5s to 5s. Through this power pre-reduction process, the risk of thermal shock when a large flow of water enters the heating chamber 91 can be reduced, making the liquid level water supply state switching process smoother.

[0097] After the large-flow water replenishment is completed, the controller 93 determines the water replenishment termination conditions based on temperature information, water level information, and water replenishment flow rate. The water replenishment termination conditions may include at least one of the following: the current water level reaches the preset working water level range, the water replenishment flow rate reaches the target water replenishment volume, the current temperature is less than the preset temperature deviation below the target temperature, or the continuous water replenishment time reaches the preset water replenishment time. After the water replenishment termination conditions are met, the controller 93 controls the water replenishment control valve 1 to switch to a continuous small-flow water supply state or a shut-off water supply state, and controls the heating element 92 to gradually recover to the steam holding power or target heating power according to a preset power ramp rate.

[0098] In one embodiment, the preset water replenishment protection power is less than the steam holding power, and the steam holding power is less than or equal to the target heating power. Before the water replenishment control valve 1 switches from a continuous low-flow water supply state to a high-flow water supply state, the controller 93 first reduces the heating power of the heating element 92 to the preset water replenishment protection power to reduce the thermal shock when a large flow of water enters the heating chamber 91. After the high-flow water replenishment ends, the controller 93 gradually increases the heating power of the heating element 92 according to a preset power ramp-up slope, so that the heating element 92 gradually recovers from the preset water replenishment protection power to the steam holding power or the target heating power. The preset power ramp-up slope can be preset according to the rated power of the heating element 92, the water capacity of the heating chamber 91, and the water replenishment flow range.

[0099] In terms of continuous low-flow water replenishment control, the controller 93 determines the evaporation capacity of the heating element 92 based on at least one of the following: the current heating power of the heating element 92, the temperature information of the heating chamber 91, the temperature change trend, the preset thermal efficiency parameter, or the factory calibration parameter. This evaporation capacity is then used as the liquid level replenishment control parameter. Evaporation capacity can be understood as the amount of water that the heating chamber 91 can evaporate per unit time under the current heating power, current temperature, and current thermal efficiency conditions. The controller 93 determines the target replenishment flow rate or valve core holding time under continuous low-flow water supply conditions based on the evaporation capacity, ensuring that the continuous low-flow replenishment volume matches the liquid level change requirements.

[0100] In one embodiment, the controller 93 stores an evaporation capacity calibration table. The evaporation capacity calibration table includes at least the correspondence between heating power, heating chamber temperature range, temperature change trend, and target water supply flow rate. The controller 93 queries the evaporation capacity calibration table according to the current operating state to determine the target water supply flow rate under continuous low-flow water supply conditions, and controls the holding time of valve core 3, valve core position, or opening frequency of water supply control valve 1 accordingly.

[0101] For example, the evaporation capacity calibration table may include the following correspondence: when the current heating power of the heating element 92 is within a first power range and the temperature of the heating chamber 91 is within a first temperature range, the controller 93 determines a first target water replenishment flow rate; when the current heating power of the heating element 92 is within a second power range and the temperature of the heating chamber 91 is within a second temperature range, the controller 93 determines a second target water replenishment flow rate; when the temperature change trend indicates that the temperature drop rate of the heating chamber 91 exceeds a preset rate of change, the controller 93 reduces the target water replenishment flow rate under continuous low-flow water supply or shortens the valve core holding time; when the temperature change trend indicates that the temperature of the heating chamber 91 is stable and the current water level is within a preset working water level range, the controller 93 maintains the target water replenishment flow rate under continuous low-flow water supply. The first power range, the second power range, the first temperature range, the second temperature range, and the corresponding target water replenishment flow rate can be calibrated at the factory and stored in the controller 93.

[0102] Furthermore, the evaporation capacity calibration table can be obtained through factory calibration. The controller 93 queries the evaporation capacity calibration table based on the current heating power of the heating element 92, the temperature range of the heating chamber 91, and the temperature change trend to determine the corresponding target water replenishment flow rate. The controller then compares the target water replenishment flow rate with the actual water replenishment flow rate detected by the flow detection element 303, and adjusts the position of the valve core 3, the holding time of the valve core 3, or the opening frequency of the water replenishment control valve 1 based on the comparison result.

[0103] In one specific example, when the current heating power of the heating element 92 is 800W, the temperature of the heating chamber 91 is between 98℃ and 105℃, and the temperature change trend is within a preset stable range, the controller 93 determines the target replenishment flow rate under continuous low-flow water supply conditions to be 20mL / min; when the current heating power of the heating element 92 is 1000W, the temperature of the heating chamber 91 is between 98℃ and 105℃, and the temperature change trend is within a preset stable range, the controller 93 determines the target replenishment flow rate under continuous low-flow water supply conditions to be 30mL / min; when the current heating power of the heating element 92 is 1200W, the temperature of the heating chamber 91 is between 98℃ and 105℃, and the temperature change trend is within a preset stable range, the controller 93 determines the target replenishment flow rate under continuous low-flow water supply conditions to be 40mL / min. The above values ​​are merely examples; the actual target replenishment flow rate can be adjusted based on the volume of the heating chamber 91, the thermal efficiency of the heating element 92, the water resistance of the water supply pipe 30, the calibrated flow rate of the replenishment control valve 1, and the factory test results.

[0104] like Figure 2 As shown, this embodiment also provides an automatic control method for liquid level replenishment based on multi-parameter feedback. The method includes:

[0105] S1, the water level information in the heating chamber 91 is obtained through the water level detection device 103, the water flow rate output to the heating chamber 91 by the flow detection device 303 is obtained through the water supply control valve 1, the water pressure information on the supply side or outlet side of the water supply control valve 1 is obtained through the pressure detection device 304, the temperature information of the heating chamber 91 and / or the temperature information of the heating element 92 is obtained through the temperature detection device 104, and the installation status of the water supply tank 10 is obtained through the plug-in electrical connection structure 600;

[0106] S2, the controller 93 uses the water level information in the heating chamber 91 as the controlled variable and the water supply flow rate output from the water supply control valve 1 to the heating chamber 91 as the regulating variable, and determines the water supply requirement of the heating chamber 91 based on the water level information.

[0107] S3, the controller 93 controls the water supply control valve 1 to switch between the water supply closed state, the continuous small flow water supply state and the large flow water supply state according to the water supply demand, water supply flow rate, water pressure information, temperature information and installation status, so that the liquid level in the heating chamber 91 is maintained within the preset working water level range.

[0108] S4. When it is detected that the water supply tank 10 is not installed properly, the water supply control valve 1 is abnormal, or the heating chamber 91 is at risk of dry burning due to lack of water, the controller 93 controls the water supply control valve 1 to switch to the water supply off state or the water supply high flow state, and controls the heating element 92 to stop heating, reduce power, or maintain the preset safe power through the power adjustment circuit 500.

[0109] In one implementation, when the controller 93 determines the water replenishment requirement based on the water level information, it can compare the current water level with a preset low water level threshold, a preset working water level range, a preset high water level threshold, and a preset safe water level threshold. When the current water level is lower than the preset low water level threshold, the controller 93 determines a large flow water replenishment requirement; when the current water level is within the preset working water level range, the controller 93 determines a continuous small flow water replenishment requirement; when the current water level reaches or exceeds the preset high water level threshold, the controller 93 determines that no water replenishment is required; when the current water level is lower than the preset safe water level threshold and the temperature information is higher than the preset dry-burning risk temperature threshold, the controller 93 determines a water shortage and dry-burning risk state.

[0110] In one embodiment, the controller 93 adjusts the water supply state of the water supply control valve 1 based on the deviation between the water supply demand and the actual water supply flow rate. For example, when the controller 93 determines that there is a continuous small flow water supply demand, but the actual water supply flow rate detected by the flow detection element 303 is lower than the preset small flow rate lower limit, the controller 93 can extend the valve core holding time, increase the opening frequency of the water supply control valve, switch to a large flow water supply state, or reduce the heating power of the heating element 92; when the controller 93 determines that there is no water supply demand or the current water level reaches a preset high water level threshold, the controller 93 controls the water supply control valve 1 to switch to a closed water supply state.

[0111] In one embodiment, when the controller 93 detects that the installation detection terminal 602 is not connected, or does not receive the execution feedback signal or position feedback signal of the water replenishment control valve 1, the controller 93 determines that the water replenishment tank 10 is not installed in place or the water replenishment control valve 1 does not have the conditions for controlled water replenishment. The controller 93 prohibits the water replenishment control valve 1 from opening and controls the heating element 92 to stop heating or maintain it at a preset safe power.

[0112] In one embodiment, when the controller 93 determines that there is a risk of blockage in the water supply control valve 1 or the continuous low-flow water supply section based on water pressure information and water supply flow rate, the controller 93 can output a warning signal. The warning signal can be an audible and visual warning signal, a display screen warning signal, a communication warning signal, or a fault code. The user can remove the blockage component 271 according to the warning signal, drain the impurities from the collection chamber 512 through the drain channel 27, or disassemble the filter screen 52 or the throttling component 6 for cleaning or replacement.

[0113] In this embodiment, the controller 93, through the aforementioned multi-parameter feedback method, enables the liquid level replenishment control to no longer rely solely on a single water level signal. Instead, it integrates water level information, replenishment flow rate, water pressure information, temperature information, and the installation status of the replenishment tank to perform coordinated control of the water supply status of the replenishment control valve 1 and the heating power of the heating element 92. This solution can maintain the liquid level in the heating chamber 91 within the preset working water level range and can promptly initiate protective control in cases of blockage, water shortage, disconnection of the water supply pipe, improper installation of the replenishment tank, or risk of dry burning due to water shortage.

[0114] In other embodiments, to improve the closed-loop regulation stability of the automatic control process for water replenishment, the controller 93 uses the water level information in the heating chamber 91 as the main controlled variable, the water replenishment flow rate output from the water replenishment control valve 1 to the heating chamber 91 as the main regulating variable, and uses the water pressure information, temperature information, and installation status of the water replenishment tank 10 as constraint feedback quantities to participate in the control. The controller 93 determines the liquid level deviation based on the deviation between the current water level information and the preset working water level range, determines the flow rate deviation based on the deviation between the target water supply flow rate and the actual water supply flow rate, and judges the consumption trend of the liquid in the heating chamber 91 in conjunction with the temperature change trend. When the liquid level deviation increases and the actual water supply flow rate is lower than the target water supply flow rate, the controller 93 increases the opening degree of the water supply control valve 1, extends the holding time of the valve core 3, or increases the opening frequency of the water supply control valve 1. When the liquid level deviation decreases and the actual water supply flow rate is higher than the target water supply flow rate, the controller 93 decreases the opening degree of the water supply control valve 1, shortens the holding time of the valve core 3, or reduces the opening frequency of the water supply control valve 1. When the water pressure information, temperature information, or installation status of the water supply tank 10 meets the abnormal judgment conditions, the controller 93 prioritizes the execution of water supply abnormality protection or heating element 92 power protection. Therefore, the controller 93 can establish a linkage feedback relationship between liquid level deviation, flow rate deviation and temperature change trend, so that the water supply state of the water supply control valve 1 is dynamically adjusted according to the actual liquid consumption state of the heating chamber 91, thereby avoiding the problems of water supply lag, excessive water supply or insufficient water supply caused by single water level switch control, and improving the liquid level control accuracy and operational safety.

[0115] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications, equivalent substitutions, or combinations can be made to the technical features in the above embodiments without departing from the spirit and scope of the present invention, and such modifications, substitutions, or combinations should all fall within the protection scope of the present invention.

Claims

1. An automatic liquid level replenishment control system based on multi-parameter feedback, applied to a steam generating device with a heating chamber, the steam generating device comprising a main body, a water replenishment tank, and a heating element, wherein the heating chamber is provided within the main body, and the heating element is used to electrically heat the heating chamber, characterized in that: The automatic water replenishment control system includes a water level detection device, a flow rate detection device, a pressure detection device, a temperature detection device, at least one water replenishment control valve, a pluggable electrical connection structure, a power regulation circuit, and a controller. The main body of the device has a water supply tank mounting cavity for accommodating the water supply tank. The water supply tank mounting cavity is provided with a water source inlet that communicates with the heating cavity. The water supply tank is provided with a clean water cavity. At least one water supply pipe is provided inside the water supply tank. The water supply pipe communicates between the clean water cavity and the water source inlet. At least one water supply control valve is provided in the corresponding water supply pipe. The water level detector is used to detect the water level information in the heating chamber, the flow rate detector is used to detect the water supply flow rate output from the water supply control valve to the heating chamber, the pressure detector is used to detect the water pressure information on the water supply side or the water outlet side of the water supply control valve, and the temperature detector is used to detect the temperature information of the heating chamber and / or the temperature information of the heating element. At least one of the water replenishment control valves is electrically connected to the controller via the plug-in electrical connection structure, which is used to detect the installation status of the water replenishment tank. The controller is electrically connected to the water level detector, the flow rate detector, the pressure detector, the temperature detector, the water supply control valve, the plug-in electrical connection structure, and the power regulation circuit, respectively. The controller is used to control the water level information in the heating chamber as the controlled variable and the water supply flow rate output to the heating chamber by the water supply control valve as the regulating variable. Based on the water level information, the water supply flow rate, the water pressure information, the temperature information, and the installation status, the controller controls the water supply control valve to switch between a closed water supply state, a continuous small flow water supply state, and a large flow water supply state, so that the liquid level in the heating chamber is maintained within a preset working water level range. The controller is also used to control the heating element to reduce its power, stop heating, or maintain a preset safe power when the water supply state of the water supply control valve is switched, the water supply flow is abnormal, the water pressure information is abnormal, or the water supply tank is not installed in place, through the power adjustment circuit.

2. The automatic liquid level replenishment control system based on multi-parameter feedback according to claim 1, characterized in that: The water supply control valve includes a valve body, a valve core, and a valve core drive component. The valve core drive component is electrically connected to the controller and is used to drive the valve core to switch between a closed position, a continuous low-flow water supply position, and a high-flow water supply position. When the valve core is in the closed position, the water supply pipeline is disconnected. When the valve core is in the continuous low-flow water supply position, the purified water chamber continuously supplies a small flow of water to the heating chamber via the water supply control valve. When the valve core is in the high-flow water supply position, the purified water chamber supplies a large flow of water to the heating chamber via the water supply control valve. Under the same water supply pressure difference, the water supply flow rate corresponding to the high-flow water supply position is more than twice the water supply flow rate corresponding to the continuous low-flow water supply position.

3. The automatic liquid level replenishment control system based on multi-parameter feedback according to claim 1, characterized in that: The controller is used to determine the operating state of the heating chamber related to the liquid level replenishment control based on the temperature information. The operating state of the heating chamber includes a heating state, a stable steam generation state, or a water shortage and dry burning risk state. When the heating chamber is in the heating state and the water level information is lower than a preset low water level threshold, the controller controls the heating element to reduce power or stop heating, and controls the water replenishment control valve to switch to a high flow water supply state. When the heating chamber is in the stable steam generation state and the water level information is within a preset working water level range, the controller controls the water replenishment control valve to switch to or maintain a continuous low flow water supply state, and controls the heating element to maintain power operation with steam. When the water level information is lower than a preset safe water level threshold and the temperature information is higher than a preset dry burning risk temperature threshold, the controller determines that the heating chamber is in a water shortage and dry burning risk state, and controls the heating element to stop heating.

4. The automatic liquid level replenishment control system based on multi-parameter feedback according to claim 1, characterized in that: When the water pressure is higher than a preset blockage judgment pressure threshold and the water supply flow is lower than a preset abnormal flow threshold, the controller determines that the water supply control valve or the throttling part within the water supply control valve used to limit continuous small flow water supply is at risk of blockage, and controls the heating element to reduce power or stop heating; when the water pressure is lower than a preset water supply pressure threshold and the water supply flow is lower than a preset abnormal flow threshold, the controller determines that the water supply tank is short of water, the water supply tank is not installed properly, or the water supply pipeline is abnormally connected, and prohibits the heating element from continuing to work at normal heating power; when the water pressure is higher than a preset blockage judgment pressure threshold, the water supply flow is lower than a preset small flow lower limit, and the duration of the water supply control valve in continuous small flow water supply state reaches a preset time, the controller determines that the continuous small flow water supply part of the water supply control valve is at risk of blockage; when the water pressure is lower than a preset water supply pressure threshold and the water supply flow is lower than a preset large flow lower limit, the controller determines that the water supply tank is short of water, the water supply pipeline is disconnected, or the water supply tank is not installed properly.

5. The automatic liquid level replenishment control system based on multi-parameter feedback according to claim 1, characterized in that: During the process of switching from continuous low-flow water replenishment to high-flow water replenishment, when the controller is preparing to switch the water replenishment control valve from continuous low-flow water supply to high-flow water supply, the controller first reduces the heating power of the heating element to a preset water replenishment protection power, and after a preset buffer time, controls the water replenishment control valve to switch to high-flow water supply. After the high-flow water replenishment ends, the controller determines the water replenishment termination condition based on the temperature information, the water level information, and the water replenishment flow rate. After the water replenishment termination condition is met, the controller controls the water replenishment control valve to switch to continuous low-flow water supply or shut off the water supply, and controls the heating element to gradually recover from the preset water replenishment protection power to the steam holding power or the target heating power according to a preset power ramp rate.

6. The automatic liquid level replenishment control system based on multi-parameter feedback according to claim 1, characterized in that: The controller determines the evaporation capacity of the heating element based on at least one of the following: the current heating power of the heating element, the temperature information of the heating chamber, the temperature change trend, the preset thermal efficiency parameter, or the factory calibration parameter. It then uses this evaporation capacity as a liquid level replenishment control parameter and determines the target replenishment flow rate or valve core holding time under continuous low-flow water supply conditions based on the evaporation capacity. The controller stores an evaporation capacity calibration table, which includes at least the correspondence between heating power, heating chamber temperature range, temperature change trend, and target replenishment flow rate. Based on the evaporation capacity calibration table, the controller determines the target replenishment flow rate under continuous low-flow water supply conditions and controls the valve core holding time, valve core position, or opening frequency of the replenishment control valve based on the target replenishment flow rate.

7. The automatic liquid level replenishment control system based on multi-parameter feedback according to claim 1, characterized in that: The pluggable electrical connection structure includes a power supply terminal, an installation detection terminal, a control signal terminal, and a feedback signal terminal. When the water supply tank is installed in the water supply tank mounting cavity, the power supply terminal, the installation detection terminal, the control signal terminal, and the feedback signal terminal are respectively turned on, enabling the water supply control valve to obtain power supply, control signal, and position feedback signal. The controller only allows the heating element to enter normal heating power when it detects that the installation detection terminal is turned on and receives the execution feedback signal or position feedback signal from the water supply control valve. Otherwise, the controller prohibits the water supply control valve from opening and controls the heating element to stop heating or maintain a preset safe power. The power adjustment circuit includes at least one of a relay power adjustment circuit, a thyristor power adjustment circuit, a PWM power adjustment circuit, or a voltage adjustment circuit. The controller adjusts the actual heating power of the heating element by controlling the power adjustment circuit.

8. The automatic liquid level replenishment control system based on multi-parameter feedback according to claim 2, characterized in that: The water supply control valve is used to establish the continuous low-flow water supply state and the high-flow water supply state. The valve body of the water supply control valve has an inlet and a outlet. A valve core moving area is formed within the valve body. The valve body also has a first throttling channel and a second throttling channel. One end of the first throttling channel is connected to the valve core moving area, and the other end is connected to the outlet. Similarly, one end of the second throttling channel is connected to the valve core moving area, and the other end is connected to the outlet. The minimum flow cross-sectional area of ​​the second throttling channel is smaller than that of the first throttling channel. The minimum flow cross-sectional area; the second throttling channel is provided with a mounting base, the mounting base forms an installation channel, and a throttling component is detachably assembled in the installation channel. The throttling component includes a ceramic throttling plate and an annular sealing ring. The ceramic throttling plate is provided with at least one micropore for limiting the continuous small flow rate of water supply. The mounting base is provided with a detachable filter screen on the upstream side of the ceramic throttling plate. A dirt collection chamber is formed between the filter screen and the ceramic throttling plate. The valve body has a drain channel corresponding to the dirt collection chamber. The drain channel has a drain port, and the drain port is closed by a detachable plug.

9. An automatic control method for liquid level replenishment based on multi-parameter feedback, applied to a steam generating device with a heating chamber, the steam generating device comprising a main body, a water replenishment tank, a heating element, a water level detection element, a temperature detection element, at least one water replenishment control valve, a power regulation circuit, a flow detection element, a pressure detection element, a pluggable electrical connection structure, and a controller, characterized in that, The method includes the following steps: S1. Obtain water level information in the heating chamber through water level detection device, obtain water supply flow rate output to the heating chamber by water supply control valve through flow detection device, obtain water pressure information on the supply side or outlet side of water supply control valve through pressure detection device, obtain temperature information of heating chamber and / or temperature information of heating element through temperature detection device, and obtain water supply tank installation status through plug-in electrical connection structure. S2. The controller uses the water level information in the heating chamber as the controlled variable and the water supply flow rate output from the water supply control valve to the heating chamber as the regulating variable to determine the water supply requirement of the heating chamber based on the water level information. S3. The controller controls the water supply control valve to switch between a closed water supply state, a continuous small flow water supply state, and a large flow water supply state according to the water supply demand, the water supply flow rate, the water pressure information, the temperature information, and the installation status, so that the liquid level in the heating chamber is maintained within the preset working water level range. S4. When the water supply tank is not installed properly, the water supply control valve is abnormal, or the heating chamber is at risk of dry burning due to lack of water, the controller controls the water supply control valve to switch to the water supply off state or the high flow water supply state, and controls the heating element to stop heating, reduce power, or maintain the preset safe power through the power adjustment circuit.

10. The automatic control method for liquid level replenishment based on multi-parameter feedback according to claim 9, characterized in that: When the water pressure is higher than a preset blockage judgment pressure threshold and the water supply flow is lower than a preset abnormal flow threshold, the controller determines that there is a risk of blockage in the water supply control valve or the throttling part within the water supply control valve used to limit continuous small flow water supply, and controls the heating element to reduce power or stop heating; when the water pressure is lower than a preset water supply pressure threshold and the water supply flow is lower than a preset abnormal flow threshold, the controller determines that the water supply tank is short of water, the water supply tank is not installed properly, or the water supply pipeline connection is abnormal, and prohibits the heating element from continuing to work at normal heating power; when the controller is preparing to switch the water supply control valve from continuous small flow water supply state to large flow water supply state, the controller first reduces the heating power of the heating element to a preset water supply protection power, and after a preset buffer time, controls the water supply control valve to switch to large flow. The controller monitors the water supply status. Based on the current heating power of the heating element, the temperature information of the heating chamber, the temperature change trend, the preset thermal efficiency parameter, or the factory calibration parameter, the controller determines the evaporation capacity of the heating element and uses the evaporation capacity as the liquid level replenishment control parameter. Based on the evaporation capacity, the controller determines the target replenishment flow rate or valve core holding time under continuous low-flow water supply conditions. After the high-flow water replenishment ends, the controller controls the heating element to gradually recover from the preset replenishment protection power to the steam holding power or the target heating power based on the temperature and water level information. When the controller does not detect that the water replenishment tank is installed in place, or does not receive the execution feedback signal or position feedback signal of the water replenishment control valve, the controller prohibits the water replenishment control valve from opening and controls the heating element to stop heating or maintain the preset safe power.

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