High-power instant heating pipe control method and temperature control system

Abstract

The invention relates to a high-power instant heating pipe control method and a temperature control system, and the method comprises the steps: when water in an instant heater is heated, adopting a paragraph heating mode, firstly increasing the water temperature to be close to a set water temperature through preheating, and then keeping the water temperature at the set water temperature through steady-state heating. The main purpose of preheating is to increase the temperature rising speed and shorten the temperature steady-state time. And when the closed-loop heating condition is met, or when the instant heating pipe maintains steady-state power heating for the first set time length, closed-loop heating is executed, and the closed-loop heating can improve the external condition anti-interference capability and improve the temperature control stability. According to the technical scheme, open-loop heating is conducted firstly, and then closed-loop heating is conducted, so that stored water in the instant heating pipe is discharged, and oscillation caused by direct closed-loop heating is avoided. In the technical scheme, more stable power output is realized through a smooth power output algorithm, and fluctuation interference on a power grid during heating of the instant heating pipe is reduced.

Description

Technical Field

[0001] This application relates to the technical field of heaters, and in particular, to a high-power instant heat pipe control method and a temperature control system. Background Art

[0002] Common instant heaters on the market include: nano-film, thick film, ceramic, boilers, etc. They usually use high-power thyristors for temperature control and adopt a rough heating and temperature control method with segmented power output. This heating and temperature control method of instant heaters is difficult to meet the user's demand for hot water. Summary of the Invention

[0003] To at least overcome to some extent the problem that the instant heaters in the related art are difficult to meet the user's demand for hot water, this application provides a high-power instant heat pipe control method and a temperature control system.

[0004] The solution of this application is as follows: According to the first aspect of the embodiments of this application, a high-power instant heat pipe control method is provided, including: Monitoring the outlet water temperature and inlet water temperature of the instant heat pipe to obtain the set water temperature; When receiving the water outlet instruction, determining whether the outlet water temperature is greater than the set water temperature; If the outlet water temperature is not greater than the set water temperature, calculating the preheating power according to the outlet water temperature and the set water temperature, and controlling the instant heat pipe to perform preheating based on the preheating power; Determining the temperature difference between the inlet and outlet water according to the outlet water temperature and the inlet water temperature; Calculating the steady-state power according to the temperature difference between the inlet and outlet water, and controlling the instant heat pipe to perform heating according to the steady-state power after preheating is completed, and reducing the fluctuation interference generated on the power grid during heating through a smooth power output algorithm; When the closed-loop heating condition is satisfied, or when the instant heat pipe maintains steady-state power heating for a first set duration, switching to closed-loop heating.

[0005] Preferably, the method further includes: If the outlet water temperature is greater than the set water temperature, determining whether the required temperature reduction amplitude exceeds a preset temperature reduction threshold; If the required temperature reduction amplitude exceeds the preset temperature reduction threshold, turning off the power output of the instant heater, and after the outlet water temperature reaches the preset outlet water condition through drainage for temperature reduction, controlling the instant heat pipe to perform heating according to the steady-state power; If the required temperature reduction amplitude does not exceed the preset temperature reduction threshold, calculating the temperature reduction heating power, controlling the instant heat pipe to perform heating according to the temperature reduction heating power, and after the outlet water temperature reaches the preset outlet water condition through drainage for temperature reduction, controlling the instant heat pipe to perform heating according to the steady-state power.

[0006] Preferably, the closed-loop heating includes: Determine the change in the inlet and outlet water temperature difference within the second set time period; If the absolute value of the inlet and outlet water temperature difference is not greater than the first temperature difference threshold within the second set time period, end the closed-loop heating; If the absolute value of the inlet and outlet water temperature difference is greater than the first temperature difference threshold within the second set time period, determine whether the absolute value of the inlet and outlet water temperature difference is greater than the second temperature difference threshold; If the absolute value of the inlet and outlet water temperature difference is greater than the second temperature difference threshold, perform heating according to the steady-state power control, i.e., the heat pipe; If the absolute value of the inlet and outlet water temperature difference is not greater than the second temperature difference threshold and the third set time period has not been reached, perform heating according to the steady-state power control, i.e., the heat pipe; If the absolute value of the inlet and outlet water temperature difference is not greater than the second temperature difference threshold and the third set time period has been reached, end the closed-loop heating; When heating according to the steady-state power control, i.e., the heat pipe, reaches the fourth set time period, end the closed-loop heating.

[0007] Preferably, the smooth power output algorithm includes: Determine the length of the power array and the number of AC frequency segments according to the rated AC frequency; Obtain the current power value of the instant heater; Divide the full power value of the instant heater evenly to obtain the length of each power array segment. Let the initial judgment position of the power array be 0 and the current judgment position be i; Evenly distribute the current power value of the instant heater into the power array in sequence; During the zero-crossing interruption, control the on / off of the thyristor and the power of the instant heater; Obtain the number of interrupt entries. When the value of the number of interrupt entries exceeds the full power value of the instant heater, reset the number of interrupt entries to 0; Calculate the remainder G-Value of the quotient of the number of interrupt entries and the number of AC frequency segments; When entering the interrupt, determine whether the remainder G-Value is greater than the current judgment position i of the power array; If the remainder G-Value is greater than the current judgment position i of the power array, turn off the control of the thyristor and the power of the instant heater; If the remainder G-Value is not greater than the current judgment position i of the power array, maintain the control of the thyristor and the power of the instant heater; Whenever the remainder G-Value loops to 0, increment the current judgment position i of the power array by one position until the end.

[0008] Preferably, the smooth power output algorithm includes: Obtain the current power of the instant heater; If the current power of the instant water heater is 0, or the current power of the instant water heater exceeds the corresponding power of the rated AC frequency, determine whether the number of half - waves of power output is 0; If the number of half - waves of power output is 0, then do not perform heating and end the control of the thyristor and the power of the instant water heater; If the number of half - waves of power output is not 0, then determine whether the number of half - waves of power output exceeds the AC frequency; If the number of half - waves of power output exceeds the AC frequency, then control the instant water heater to heat at the corresponding power of the rated AC frequency; If the current power of the instant water heater is not 0, and the current power of the instant water heater does not exceed the corresponding power of the rated AC frequency, then determine the required number of power output waves according to the rated AC frequency; Determine the power array data; Obtain the heating control pulse array according to the power array data; Determine whether the control end condition is reached; the control end condition is that the current power of the instant water heater exceeds the corresponding power of the rated AC frequency; If the control end condition is not reached, each time an interrupt is entered, extract a value from the heating control pulse array in sequence to control the thyristor and the power of the instant water heater; Execute a loop, and when the position of the currently extracted value in the heating control pulse array exceeds the corresponding value of the rated AC frequency, reset the loop until the control end condition is reached.

[0009] Preferably, the method further includes: Monitor the water flow at the water inlet of the instant heat pipe; Calculate the target control pulse width according to the monitored water flow, the set water flow, and the number of microseconds of clock counting; Determine the pulse interval of the flowmeter; When the pulse interval is greater than the target control pulse width, reduce the working voltage of the water pump to reduce the pulse interval; when the pulse interval is not greater than the target control pulse width, increase the working voltage of the water pump to increase the pulse interval; When the absolute value of the difference between the pulse interval and the target control pulse width is greater than the water inlet abnormal threshold, determine that the current machine has abnormal water inlet, and reduce the control power of the instant heat pipe until the absolute value of the difference between the pulse interval and the target control pulse width is 0; When the absolute value of the difference between the pulse interval and the target control pulse width is not greater than the water inlet abnormal threshold, determine that the current machine has normal water inlet and resume heating.

[0010] Preferably, calculating the pre - heating power according to the outlet water temperature and the set water temperature includes: Calculate the preheating power based on the preheating time, power gain, set water temperature, water outlet temperature, specific heat capacity, water storage capacity of the heat pipe and heating efficiency of the heat pipe; Calculating the steady-state power according to the inlet and outlet water temperature difference includes: The steady-state power is calculated based on the monitored water flow rate, specific heat capacity, inlet and outlet temperature difference and the heating efficiency of the heat pipe.

[0011] Preferably, the method further comprises: When the outlet water temperature is higher than the high temperature alarm threshold value for a fifth set time period, a high temperature alarm is issued; Acquire water pump voltage slope data, and when the water pump voltage slope exceeds the water pump alarm threshold within a sixth preset time period, issue a water pump alarm; When the flow meter loses the pulse signal for more than the seventh preset time, a water shortage alarm is issued; Obtain the water level data in the water tank. When the water level in the water tank is lower than the water level threshold, issue a water shortage alarm and adjust the water output of the water pump; The water level data in the instant heater is obtained before the instant heater is started, and when the water level in the instant heater is lower than the water level threshold, a water shortage alarm is issued.

[0012] Preferably, after the water shortage alarm is performed, the method further comprises: The instant heating pipe is controlled to stop heating, and after maintaining the eighth preset time, the water pump is controlled to stop working, and the gas in the empty pipe area is transferred to the top of the instant heating pipe to replenish water to the instant heating pipe.

[0013] Preferably, the method further comprises: Record the steady-state power required to reach the set water temperature when the instantaneous heater was working last time; After receiving the current water outlet command and executing preheating, if the current set water temperature does not change, the heat pipe is heated according to the recorded steady-state power control; If the current set water temperature changes, the recorded steady-state power is adjusted according to the ratio of the current set water temperature to the last set water temperature to obtain the current required steady-state power.

[0014] According to a second aspect of an embodiment of the present application, a high-power heat pipe temperature control system is provided, comprising: Water storage tank, water pump inlet pipe, flow meter, flow meter inlet pipe, reversing valve, reversing valve inlet pipe, plate-penetrating joint, CCK pipe, pressure balancer, transition water tank inlet pipe, one-way valve, transition water tank, instant heating pipe outlet pipe, transition water tank outlet pipe, stainless steel outlet pipe, instant heating pipe, instant heating pipe inlet pipe, water pump and MCU; The water inlet pipe of the heating pipe is internally provided with a first temperature sensor; The water outlet pipe of the heating pipe has a built-in second temperature sensor; The reversing valve is connected to the water storage tank through the reversing valve water inlet pipe; it is also connected to the flow meter through the flow meter water inlet pipe; The water pump is connected to the flow meter through the water pump water inlet pipe; it is also connected to the instant heating pipe through the instant heating pipe water inlet pipe; The one-way valve is connected to the instant heating pipe through the instant heating pipe water inlet pipe; it is also connected to the transition water tank through the transition water tank water inlet pipe; The transition water tank is connected to the stainless steel water outlet pipe through the transition water tank water outlet pipe for water discharge; One end of the CCK pipe is connected to the tap water source, and the other end passes through the pressure balancer and is connected to the reversing valve through the through-board joint; The MCU is electrically connected to the flow meter, water pump, first temperature sensor, second temperature sensor, and instant heating pipe; The MCU is used to execute the control method of the high-power instant heating pipe temperature control system according to any one of claims 1-10.

[0015] Preferably, the system further includes: A first Y capacitor, a second Y capacitor, a first inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a rectifier bridge, an optocoupler, and a first capacitor; The first Y capacitor, the second Y capacitor, and the first inductor form a common-mode filter circuit and are connected to the mains; The first resistor and the second resistor are connected in series; the third resistor and the fourth resistor are connected in series; The first inductor is connected to the rectifier bridge through the first resistor, the second resistor, the third resistor, and the fourth resistor; The rectifier bridge is connected to the input end of the optocoupler; A first interface at the output end of the optocoupler is connected to the MCU through the first capacitor; a second interface at the output end of the optocoupler is connected to the fifth resistor.

[0016] Preferably, the system further includes: A sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a second capacitor, a third capacitor, a fourth capacitor, a triac, an opto-isolated thyristor, a triode, and an overheat protection relay; The first end of the triac is connected to the mains filtered by the common-mode filter circuit; The second end of the triac is connected to the instant heating pipe through the overheat protection relay; The eighth resistor and the ninth resistor are connected in parallel; The tenth resistor and the eleventh resistor are connected in parallel; The third terminal of the TRIAC is connected to the first terminal of the opto-isolated thyristor after passing through the eighth resistor, ninth resistor, tenth resistor, and eleventh resistor; The second terminal of the opto-isolated thyristor is connected to the commercial power filtered by the common-mode filter circuit; The third terminal of the opto-isolated thyristor is connected to the 5V power supply through the fourteenth resistor; The fourth terminal of the opto-isolated thyristor is connected to the collector of the triode; The base of the triode is connected to the MCU through the twelfth resistor and is also grounded through the thirteenth resistor; The emitter of the triode is grounded; The sixth resistor, seventh resistor, second capacitor, third capacitor, and fourth capacitor are connected in parallel between the first terminal and the second terminal of the TRIAC; among them, the sixth resistor and the seventh resistor are connected in parallel; the second capacitor, third capacitor, and fourth capacitor are connected in parallel.

[0017] Preferably, the MCU is connected to the host computer through a wired communication method; The MCU is connected to the user terminal through a wireless communication method; The MCU is configured with a control panel; A reversing button for controlling the reversing valve is configured on the control panel; The reversing valve is also connected to a regulated water source, and when receiving a reversing instruction from the host computer, user terminal, or reversing button, it switches the water supply method among the water storage tank, tap water source, and regulated water source.

[0018] The technical solution provided by this application may include the following beneficial effects: The high-power instant heat pipe temperature control system control method in this application includes: monitoring the outlet water temperature and inlet water temperature of the instant heat pipe to obtain the set water temperature; when receiving the outlet water instruction, determining whether the outlet water temperature is greater than the set water temperature; if the outlet water temperature is not greater than the set water temperature, calculating the preheating power based on the outlet water temperature and the set water temperature, and controlling the instant heat pipe to preheat based on the preheating power; determining the temperature difference between the inlet and outlet water according to the outlet water temperature and the inlet water temperature; calculating the steady-state power according to the temperature difference between the inlet and outlet water, and controlling the instant heat pipe to heat based on the steady-state power after preheating is completed, and reducing the fluctuation interference generated on the power grid during heating through a smooth power output algorithm; when meeting the closed-loop heating condition, or when the instant heat pipe maintains steady-state power heating for a first set duration, switching to closed-loop heating.

[0019] When heating the water in the instant water heater, this technical solution adopts a segmented heating method. First, the water temperature is raised to near the set water temperature through preheating, and then the water temperature is maintained at the set water temperature through steady-state heating. The main purpose of preheating is to increase the temperature rise speed and shorten the temperature steady-state time. When the closed-loop heating condition is met, or when the instant heat pipe maintains a steady-state power heating for the first set duration, closed-loop heating is executed. Closed-loop heating can improve the anti-interference ability of external conditions and enhance the temperature control stability. In this technical solution, open-loop heating is carried out first, and then closed-loop heating is entered to drain the "stored water" in the instant heat pipe and avoid oscillations when directly entering the closed loop. Moreover, in this technical solution, a more stable power output is achieved through a smooth power output algorithm, reducing the fluctuation interference generated by the instant heat pipe heating on the power grid.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. Brief Description of the Drawings

[0021] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0022] Figure 1 It is a schematic flowchart of a control method for a high-power instant heat pipe temperature control system provided by an embodiment of this application; Figure 2 It is a schematic flowchart of another control method for a high-power instant heat pipe temperature control system provided by an embodiment of this application; Figure 3 It is a schematic flowchart of the closed-loop heating process in a control method for a high-power instant heat pipe temperature control system provided by an embodiment of this application; Figure 4 It is a schematic flowchart of the second smooth power output algorithm in a control method for a high-power instant heat pipe temperature control system provided by an embodiment of this application; Figure 5 It is a schematic flowchart of the constant water flow control for the water outlet in a control method for a high-power instant heat pipe temperature control system provided by an embodiment of this application Figure 6 It is a schematic diagram of anti-dry-burning water replenishment in a control method for a high-power instant heat pipe temperature control system provided by an embodiment of this application; Figure 7 It is a schematic diagram of segmented heating in a control method for a high-power instant heat pipe temperature control system provided by an embodiment of this application; Figure 8 It is a schematic structural diagram of a high-power instant heat pipe temperature control system provided by an embodiment of this application; Figure 9It is the circuit diagram of a high-power instant heat pipe temperature control system provided by an embodiment of the present application; Figure 10 It is the working schematic diagram of a high-power instant heat pipe temperature control system provided by an embodiment of the present application; Figure 11 It is the circuit diagram of the rectification and filtering part in a high-power instant heat pipe temperature control system provided by an embodiment of the present application; Figure 12 It is the circuit diagram of the bidirectional thyristor part in a high-power instant heat pipe temperature control system provided by an embodiment of the present application.

[0023] Reference numerals: water storage tank - 1; water pump inlet pipe - 2; flow meter - 3; flow meter inlet pipe - 4; reversing valve - 5; reversing valve inlet pipe - 6; through-board joint - 7; CC pipe - 8; pressure balancer - 9; transition water tank inlet pipe - 10; check valve - 11; transition water tank - 12; instant heat pipe outlet pipe - 13; transition water tank outlet pipe - 14; stainless steel outlet pipe - 15 instant heat pipe - 16; instant heat pipe inlet pipe - 17; water pump - 18; first Y capacitor - CY1; second Y capacitor - CY2; first inductor - L1; first resistor - R1; second resistor - R2; third resistor - R3; fourth resistor - R4; fifth resistor - R5; rectifier bridge - BD1; optocoupler - OP1; first capacitor - C1; sixth resistor - R6; seventh resistor - R7; eighth resistor - R8; ninth resistor - R9; tenth resistor - R10; eleventh resistor - R11; twelfth resistor - R12; thirteenth resistor - R13; fourteenth resistor - R14; second capacitor - C2; third capacitor - C3; fourth capacitor - C4; bidirectional thyristor - Q1; photo-isolated thyristor - OP2; triode - Q2; overheat protection relay - F1. Detailed implementation manners

[0024] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present application. On the contrary, they are merely examples of the devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0025] A high-power instant heat pipe control method includes: S11: Monitoring the outlet water temperature and inlet water temperature of the instant heat pipe to obtain the set water temperature; S12: When receiving the outlet water instruction, determining whether the outlet water temperature is greater than the set water temperature; S13: If the outlet water temperature is not greater than the set water temperature, calculating the preheating power according to the outlet water temperature and the set water temperature, and controlling the instant heat pipe to perform preheating based on the preheating power; S14: Determine the temperature difference between the outlet water temperature and the inlet water temperature; S15: Calculate the steady-state power based on the temperature difference between the outlet and inlet water, and after the preheating is completed, control the heating of the heat pipe according to the steady-state power. During the heating process, reduce the fluctuation interference on the power grid generated during heating through a smooth power output algorithm; S16: When the closed-loop heating condition is met, or when the heat pipe maintains the steady-state power heating for a first set duration, switch to closed-loop heating.

[0026] It should be noted that with reference to Figure 2 , the method further includes: S21: If the outlet water temperature is greater than the set water temperature, determine whether the required temperature reduction amplitude exceeds a preset temperature reduction threshold; S22: If the required temperature reduction amplitude exceeds the preset temperature reduction threshold, turn off the power output of the heat exchanger. After the outlet water temperature reaches the preset outlet water condition through drainage for temperature reduction, control the heating of the heat pipe according to the steady-state power; S23: If the required temperature reduction amplitude does not exceed the preset temperature reduction threshold, calculate the temperature reduction heating power, control the heating of the heat pipe according to the temperature reduction heating power, and after the outlet water temperature reaches the preset outlet water condition through drainage for temperature reduction, control the heating of the heat pipe according to the steady-state power.

[0027] It should be noted that in this technical solution, it is necessary to monitor the outlet water temperature and the inlet water temperature of the heat pipe (monitored by a temperature sensor), and obtain the set water temperature (set by the upper computer or the user terminal).

[0028] After the water injection function is started and the water outlet instruction is received, at this time, it is judged whether the outlet water temperature is greater than the set water temperature. If the outlet water temperature is not greater than the set water temperature, it means that the water in the heat exchanger needs to be heated.

[0029] In this technical solution, when heating the water in the heat exchanger, a sectional heating method is adopted. First, the water temperature is raised to near the set water temperature through preheating, and then the water temperature is maintained at the set water temperature through steady-state heating.

[0030] The main purpose of preheating is to increase the temperature rise speed and shorten the temperature steady-state time.

[0031] In specific practice, the specific formula for calculating the preheating power according to the preheating time, power gain, set water temperature, outlet water temperature, specific heat capacity, water storage capacity of the heat pipe, and heating efficiency of the heat pipe is: Preheating power = (water storage capacity of the heat pipe / preheating time * power gain) * (set water temperature - outlet water temperature) * specific heat capacity / heating efficiency of the heat exchanger.

[0032] Among them, the preheating time is determined by the initial value of the outlet water temperature (>70°C, the preheating time is 1s; >40°C, the preheating time is 2s; <40°C, the preheating time is 3s).

[0033] The power gain is defaulted to 1, which is used to adjust the temperature rise response speed. The larger the value, the steeper the temperature climb.

[0034] That is, the heat pipe efficiency is the self-parameter of the heat pipe and can be calibrated by the user.

[0035] The specific formula for calculating the steady-state power according to the water flow rate, specific heat capacity, temperature difference between the inlet and outlet water monitored by the flow meter and the heating efficiency of the heat pipe is as follows: Steady-state power = water flow rate * specific heat capacity * (outlet water temperature - inlet water temperature) / heat pipe heating efficiency.

[0036] Example: The specific heat capacity is 4.2J / g*°C, the water flow rate is 3.5ml / s, the temperature rise is 75°C, and the efficiency is 95%. Then the steady-state power is 1160.53.

[0037] When the closed-loop heating condition is satisfied, or when the heat pipe maintains the steady-state power heating for the first set duration, the closed-loop heating is executed. The closed-loop heating condition is also the PID intervention condition. When the heat pipe maintains the steady-state power heating for the first set duration, it means that the open-loop control times out and PID intervention is required. When any of the above conditions is triggered, the closed-loop heating is switched to. The closed-loop heating can improve the anti-interference ability of external conditions and improve the temperature control stability.

[0038] In specific practice, the first set duration can be 4s.

[0039] It should be noted that when the outlet water temperature is greater than the set water temperature, for example, the outlet water temperature is 100°C and the set water temperature is 90°C. At this time, it is necessary to reduce the outlet water temperature to meet the requirements. The scheme for reducing the outlet water temperature in this embodiment is as follows: Judge whether the required temperature reduction amplitude exceeds the preset temperature reduction threshold. The preset temperature reduction threshold can be 1°C. When the required temperature reduction amplitude exceeds the preset temperature reduction threshold (such as the outlet water temperature is 100°C and the set water temperature is 95°C, at this time, a 5°C temperature reduction is required), due to the large temperature reduction amplitude, directly turn off the power output of the heater. After the outlet water temperature reaches the preset outlet condition through draining, control the heat pipe to heat according to the steady-state power.

[0040] The preset outlet condition here is set to be close to the outlet water temperature, not exceeding 1°C above or below the outlet water temperature.

[0041] When the required temperature reduction amplitude does not exceed the preset temperature reduction threshold (for example, the outlet water temperature is 96°C, the set water temperature is 95°C, and at this time, a temperature reduction of 1°C is required), since the temperature reduction amplitude is small, the temperature reduction heating power can be calculated, and the heating is controlled according to the temperature reduction heating power, that is, the heat pipe is heated. After the outlet water temperature reaches the preset outlet water condition through drainage, the heat pipe is heated according to the steady-state power control.

[0042] The temperature reduction heating power here can be taken as half of the steady-state power. For example, if the steady-state power is 60W, the temperature reduction heating power is taken as 30W.

[0043] It should be noted that in this embodiment, open-loop heating is first performed, and then closed-loop heating is entered to drain the "stored water" in the heat pipe to avoid oscillation when directly entering the closed loop.

[0044] When heating the water in the instant heater, this technical solution adopts a sectional heating method. First, the water temperature is raised to near the set water temperature through preheating, and then the water temperature is maintained at the set water temperature through steady-state heating. The main purpose of preheating is to increase the temperature rise speed and shorten the temperature steady-state time. When the closed-loop heating condition is met, or when the heat pipe maintains steady-state power heating for the first set duration, closed-loop heating is executed. Closed-loop heating can improve the anti-interference ability of external conditions and improve the temperature control stability. In this technical solution, open-loop heating is first performed, and then closed-loop heating is entered to drain the "stored water" in the heat pipe to avoid oscillation when directly entering the closed loop. And in this technical solution, a more stable power output is achieved through a smooth power output algorithm, reducing the fluctuation interference generated by the heat pipe heating on the power grid.

[0045] Embodiment 2 It should be noted that referring to Figure 3 , closed-loop heating includes: Determine the change in the inlet and outlet water temperature difference within the second set duration; If the absolute value of the inlet and outlet water temperature difference is not greater than the first temperature difference threshold within the second set duration, end the closed-loop heating; If the absolute value of the inlet and outlet water temperature difference is greater than the first temperature difference threshold within the second set duration, determine whether the absolute value of the inlet and outlet water temperature difference is greater than the second temperature difference threshold; If the absolute value of the inlet and outlet water temperature difference is greater than the second temperature difference threshold, control the heat pipe to heat according to the steady-state power; If the absolute value of the inlet and outlet water temperature difference is not greater than the second temperature difference threshold and the third set duration has not been reached, control the heat pipe to heat according to the steady-state power; If the absolute value of the inlet and outlet water temperature difference is not greater than the second temperature difference threshold and the third set duration has been reached, end the closed-loop heating; When heating according to the steady-state power control of the heat pipe reaches the fourth set duration, end the closed-loop heating.

[0046] In specific practice, the second set duration is 4s, the first temperature difference threshold is ±3°C, the first temperature difference threshold is ±7°C, the third set duration is 4s, and the fourth set duration is 8s.

[0047] For the closed-loop heating in this embodiment, without considering water shortage, first determine whether the temperature difference between the inlet and outlet water is greater than ±3°C within 4s. If it is not greater than ±3°C, it means no adjustment is needed and the closed-loop heating can be directly ended. If the temperature difference between the inlet and outlet water is greater than ±3°C within 4s, then determine whether it is greater than ±7°C. If it is greater than ±7°C, it indicates a large temperature difference and heating needs to be maintained for a longer time (8s). If it is not greater than ±7°C, it indicates a small temperature difference and only a short-time (4s) heating is required.

[0048] Embodiment Three It should be noted that in this technical solution, two smooth power output algorithms can be used to achieve more stable power output and reduce the fluctuation interference to the power grid during the heating of the heat pipe.

[0049] The first smooth power output algorithm includes: Determine the length of the power array and the number of AC frequency parts according to the rated AC frequency; Obtain the current power value of the instant heater; Divide the full power value of the instant heater evenly to obtain the length of each power array. Let the initial judgment position of the power array be 0 and the current judgment position be i; Evenly distribute the current power value of the instant heater into the power array in sequence; During the zero-crossing interruption, control the on-off of the thyristor and the power of the instant heater; Obtain the number of interrupt entries. When the value of the number of interrupt entries exceeds the full power value of the instant heater, reset the number of interrupt entries to 0; Calculate the remainder G-Value of the quotient of the number of interrupt entries and the number of AC frequency parts; When entering the interrupt, determine whether the remainder G-Value is greater than the current judgment position i of the power array; If the remainder G-Value is greater than the current judgment position i of the power array, turn off the control of the thyristor and the power of the instant heater; If the remainder G-Value is not greater than the current judgment position i of the power array, maintain the control of the thyristor and the power of the instant heater; Whenever the remainder G-Value loops to 0, increment the current judgment position i of the power array by one position until the end.

[0050] Explanation of the first smooth power output algorithm: Calculate the current power value of the instant water heater according to the specific heat capacity ratio of water. For AC frequencies of 50Hz and 60Hz, after being rectified by the hardware rectifier bridge, the full power values are 100 and 120 respectively in 1s (after 50Hz rectification, there are 100 zero-crossing points, and similarly, there are 120 zero-crossing points for 60Hz). In order to reduce the impact on the power grid caused by power control, the first smooth power output algorithm is adopted to reduce the impact, as follows: Step 1: Divide the full power value into 5 parts (for 50Hz) and 6 parts (for 60Hz), and the length of the power array can be obtained as 20. The current judgment position of the power array is i, and the initial value is 0; Step 2: Evenly distribute the current power value of the instant water heater into the power array in sequence. Example: Assume the current power value of the instant water heater is 73. After 3 loops, with 20 power values filling the array each time, there are still 13 power values left, which are distributed in the fourth loop of the array. The power array HeatParaStru.PowerPluse can be obtained. The first 13 data are looped 4 times, and the last 7 data are looped 3 times, getting the power array HeatParaStru.PowerPluse = {4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3}; Step 3: When the zero-crossing interruption arrives, at the zero-crossing interruption, control the on / off of the thyristor and the power of the instant water heater. The number of interrupt entries is reserve_cnt. When the value of reserve_cnt exceeds the number of full power values, it is reset to 0. The number of copies of the AC frequency is E-Count(HeatParaStru.AcFreg / 10), and its value is 5 or 6 (for 50hz or 60Hz), and the copy array F-Array can be obtained; Step 4: Take the remainder G-Value G-Value = (reserve_cnt / E-Count), and the range of G-Value is [0, 1, 2, 3, 4] or [0, 1, 2, 3, 4, 5] for 50Hz and 60Hz.

[0051] Step 5: When entering the interruption, judge whether G-Value is greater than the data at the i-th position of the power array. If it is, turn off the control; otherwise, turn on the control; Step 6: Each time when G-Value loops to 0, the judgment position i of the power array is incremented by one until the end.

[0052] Refer to Figure 4 , the second smooth power output algorithm includes: Obtain the current power of the instant water heater; If the current power of the instant water heater is 0, or the current power of the instant water heater exceeds the corresponding power of the rated AC frequency, judge whether the number of half-cycles of power output is 0; If the number of half - cycles of power output is 0, heating is not performed and the control of the thyristor and the water heater power ends; If the number of half - cycles of power output is not 0, determine whether the number of half - cycles of power output exceeds the AC frequency; If the number of half - cycles of power output exceeds the AC frequency, control the water heater to heat at the corresponding power of the rated AC frequency; If the current power of the water heater is not 0 and the current power of the water heater does not exceed the corresponding power of the rated AC frequency, determine the required number of power output waves according to the rated AC frequency; Determine the power array data; Obtain the heating control pulse array according to the power array data; Judge whether the control end condition is reached; the control end condition is that the current power of the water heater exceeds the corresponding power of the rated AC frequency; If the control end condition is not reached, each time an interrupt is entered, extract a value from the heating control pulse array in sequence to control the thyristor and the water heater power; Execute the loop, and when the number of bits of the currently extracted value in the heating control pulse array exceeds the corresponding value of the rated AC frequency, reset the loop until the control end condition is reached.

[0053] Figure 4 Among them, heater war.ac_freq represents the AC frequency, and heater_var.plue_cnt represents the required number of power output waves.

[0054] The second smooth power output algorithm first judges whether the current power of the water heater is 0 and whether the current power of the water heater exceeds the corresponding power of the rated AC frequency.

[0055] If the current power of the water heater is 0, it means that the current user demand is for normal water temperature and no heating is required.

[0056] If the current power of the water heater exceeds the corresponding power of the rated AC frequency, it means that a power abnormality occurs.

[0057] When one of these two conditions is met, judge whether the number of half - cycles of power output is 0. If the number of half - cycles of power output is 0, heating is not performed and the control of the thyristor and the water heater power ends; if the number of half - cycles of power output is not 0, judge whether the number of half - cycles of power output exceeds the AC frequency; if the number of half - cycles of power output exceeds the AC frequency, control the water heater to heat at the corresponding power of the rated AC frequency.

[0058] When these two conditions are not met, it means normal heating. The required number of power output waves is determined according to the rated AC frequency. For example, if the rated AC frequency is 50, the required number of power output waves can be 32.

[0059] Determine the power array data [6, 6, 6, 6, 8].

[0060] Obtain the heating control pulse array PoweroutModecount = [1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0] according to the power array data.

[0061] Judge whether the control end condition is reached; the control end condition is that the current power of the instant heater exceeds the corresponding power of the rated AC frequency. If the control end condition is not reached, each time an interruption occurs, a value is sequentially extracted from the heating control pulse array to control the thyristor and the power of the instant heater; execute the loop, and when the number of bits of the currently extracted value in the heating control pulse array exceeds the corresponding value of the rated AC frequency, reset the loop until the control end condition is reached.

[0062] After applying the smooth power output algorithm, the experimental data is as follows: Under the voltage power supply of 220V / 50Hz, the power required to maintain a 20% power screen cycle for 1S is: 312.5W; Under the voltage power supply of 220V / 50Hz, the power required to maintain a 23% power screen cycle for 1S is: 350.1W; Under the voltage power supply of 220V / 50Hz, the power required to maintain a 50% power screen cycle for 0.5S is: 805.8W; Under the voltage power supply of 220V / 50Hz, the power required to maintain a 70% power screen cycle for 1S is: 1095W; Under the voltage power supply of 220V / 60Hz, the power required to maintain a 20% power screen cycle for 1S is: 293.4W; Under the voltage power supply of 220V / 60Hz, the power required to maintain a 23% power screen cycle for 1S is: 392.3W; Under the voltage power supply of 220V / 60Hz, the power required to maintain a 50% power screen cycle for 0.5S is: 733.9W; Under the voltage power supply of 220V / 60Hz, the power required to maintain a 70% power screen cycle for 1S is: 1016W; Under a voltage power supply of 220V / 50Hz, the power required to maintain a screen cycle of 0 power for 1S is: 2.269W; Under a voltage power supply of 220V / 50Hz, the power required to maintain a full-power screen cycle for 1S is: 1574W; Under a voltage power supply of 220V / 60Hz, the power required to maintain a screen cycle of 0 for 1S is: 2.123W; Under a voltage power supply of 220V / 60Hz, the power required to maintain a full-power screen cycle for 1S is: 1490W.

[0063] Example 4 It should be noted that the method further includes: Monitoring the water flow rate at the water inlet of the heat pipe; Calculating the target control pulse width according to the monitored water flow rate, the set water flow rate, and the number of microseconds of the clock count; Determining the pulse interval of the flow meter; When the pulse interval is greater than the target control pulse width, reducing the working voltage of the water pump to reduce the pulse interval; when the pulse interval is not greater than the target control pulse width, increasing the working voltage of the water pump to increase the pulse interval; When the absolute value of the difference between the pulse interval and the target control pulse width is greater than the water inlet abnormal threshold, determining that the current machine has abnormal water inlet, and reducing the control power of the heat pipe until the absolute value of the difference between the pulse interval and the target control pulse width is 0; When the absolute value of the difference between the pulse interval and the target control pulse width is not greater than the water inlet abnormal threshold, determining that the current machine has normal water inlet and resuming heating.

[0064] Figure 5 It is a schematic diagram of the constant water flow control process at the water outlet. Refer to Figure 9 , in this embodiment, the constant water flow at the water outlet is controlled according to the water flow rate monitored by the flow meter. The constant water flow at the water outlet means that under the given water source conditions, by adjusting the operating state of the water pump, the water pressure is kept constant. The constant water flow control in this embodiment can ensure stable water pressure and is not affected by factors such as the length, height of the water supply pipeline, and the number of users.

[0065] Example 5 It should be noted that the method further includes: When the outlet water temperature is higher than the high-temperature alarm threshold for the fifth set duration, performing a high-temperature alarm; Obtaining the water pump voltage slope data, and when the voltage slope of the water pump exceeds the water pump alarm threshold within the sixth preset duration, performing a water pump alarm; When the flow meter loses the pulse signal for more than the seventh preset duration, performing a water shortage alarm; Obtain the water level data in the water storage tank. When the water level in the water storage tank is lower than the water level threshold, issue a water shortage alarm and adjust the water output of the water pump. Obtain the water level data in the instant water heater before the instant water heater starts. When the water level in the instant water heater is lower than the water level threshold, issue a water shortage alarm.

[0066] In this embodiment, multiple water shortage alarm methods are also provided to prevent the instant water heater from dry burning through multiple water shortage alarm methods.

[0067] In specific practice, the fifth set duration in the high-temperature alarm is 1 s, and the high-temperature alarm threshold is set to 100 °C. For example, when the temperature at the outlet of the instant water heater remains at 101 °C for 1 s, a high-temperature alarm is issued.

[0068] In specific practice, the fifth set duration in the water pump alarm is 100 ms, and the water pump alarm threshold is 500. For example, when the slope of the water pump voltage exceeds 500 (10-bit PWM) within 100 ms, a water pump alarm is issued.

[0069] In specific practice, the seventh preset duration is 2 s. When the flowmeter loses the pulse signal for more than 2 s, a water shortage alarm is issued.

[0070] In specific practice, the eighth preset duration is 1 s. After issuing a water shortage alarm, control the instant heating pipe to stop heating. After maintaining for 1 s, control the water pump to stop working, transfer the gas in the empty pipe area to above the instant heating pipe, and replenish water to the instant heating pipe.

[0071] When implementing this technical solution, the heating needs to be stopped first before stopping the water pump, including the following situations: The water pump is running normally: When there are 3 mL remaining, turn off the heating first and then turn off the water pump; The water pump stops actively: After turning off the heating, check that there are still 8 pulses left in the remaining flowmeter and then turn off the water pump; The water pump stops due to a water shortage alarm: Turn off the heating first, and the water pump runs for another 1 second and then stops working.

[0072] It should be noted that after issuing a water shortage alarm, the method further includes: Control the instant heating pipe to stop heating. After maintaining for the eighth preset duration, control the water pump to stop working, transfer the gas in the empty pipe area to above the instant heating pipe, and replenish water to the instant heating pipe.

[0073] This technical solution not only includes the above anti-dry burning warning method but also includes subsequent processing methods. Specifically, as Figure 6 shown, in this technical solution, the gas in the empty pipe area is transferred to above the instant heating pipe to replenish water to the instant heating pipe.

[0074] Embodiment Six It should be noted that the method further includes: Record the steady-state power required to reach the set water temperature during the last operation of the instant water heater; After receiving the current water outlet instruction and performing preheating, if the current set water temperature remains unchanged, control the instant heat pipe to heat according to the recorded steady-state power; If the current set water temperature changes, adjust the recorded steady-state power according to the ratio of the current set water temperature to the previous set water temperature to obtain the current required steady-state power.

[0075] It can be understood that in this embodiment, by recording the steady-state power required to reach the set water temperature during the last operation of the instant water heater, the steady-state power recorded last time can be directly called during this heating, thereby achieving a faster response speed. When the current set water temperature changes, the recorded steady-state power can also be adjusted according to the ratio of the current set water temperature to the previous set water temperature to obtain the current required steady-state power. As Figure 11 shown, Figure 11 in the first-stage heating, the steady-state power needs to be calculated, while in the second-stage heating, the steady-state power recorded in the first-stage heating can be directly called. It can be seen from Figure 7 that the time required for the second-stage heating to reach the set temperature is significantly shorter than that of the first-stage heating.

[0076] Embodiment Seven A high-power instant heat pipe temperature control system, referring to Figure 8 , includes: A water storage tank, a water pump inlet pipe, a flow meter, a flow meter inlet pipe, a reversing valve, a reversing valve inlet pipe, a through-plate joint, a CCK pipe, a pressure balancer, a transition water tank inlet pipe, a check valve, a transition water tank, an instant heat pipe outlet pipe, a transition water tank outlet pipe, a stainless steel outlet pipe, an instant heat pipe, an instant heat pipe inlet pipe, a water pump, and an MCU; The instant heat pipe inlet pipe is internally provided with a first temperature sensor; The instant heat pipe outlet pipe is internally provided with a second temperature sensor; The reversing valve is connected to the water storage tank through the reversing valve inlet pipe; and is also connected to the flow meter through the flow meter inlet pipe; The water pump is connected to the flow meter through the water pump inlet pipe; and is also connected to the instant heat pipe through the instant heat pipe inlet pipe; The check valve is connected to the instant heat pipe through the instant heat pipe inlet pipe; and is also connected to the transition water tank through the transition water tank inlet pipe; The transition water tank is connected to the stainless steel outlet pipe through the transition water tank outlet pipe for water outlet; One end of the CCK pipe is connected to the tap water source, and the other end passes through the pressure balancer and is connected to the reversing valve through the through-plate joint; The MCU is electrically connected to the flow meter, the water pump, the first temperature sensor, the second temperature sensor, and the instant heat pipe; The MCU is used to execute the high-power instant heat pipe control method in any of the above embodiments.

[0077] It should be noted that in this embodiment, by installing a first temperature sensor inside the inlet pipe of the instant heating pipe, the water temperature at the inlet of the instant heating pipe can be obtained; by installing a second temperature sensor inside the outlet pipe of the instant heating pipe, the water temperature at the outlet of the instant heating pipe can be obtained.

[0078] In this embodiment, by connecting a flow meter at the inlet of the water pump, the inlet water flow of the water storage tank, the tap water source or the voltage stabilizing source can be obtained.

[0079] In process control, a PID controller (also known as a PID regulator) that controls according to the proportion (P), integral (I), and derivative (D) of the deviation is one of the most widely used automatic controllers. It has the advantages of simple principle, easy implementation, wide application range, independent control parameters, and simple selection of parameters. The characteristic of the closed-loop control system implemented by the PID controller is that the output (controlled quantity) of the system's controlled object will be fed back to affect the output of the controller, forming one or more closed loops.

[0080] Refer to Figure 9 - Figure 10 , in this technical solution, two PID closed loops are constructed. One is that the MCU adjusts the working voltage of the water pump in a closed loop according to the water flow monitored by the flow meter and the set water flow, so as to automatically adjust the inlet water flow and ensure the stability of the inlet water.

[0081] The other is that the MCU adjusts the heating power of the instant heating pipe in a closed loop according to the water temperature monitored by the first temperature sensor and the second temperature sensor and the set water temperature. By monitoring the water temperature at the inlet and outlet, the automatic control of the instant heater power can be realized, which can improve the anti-interference ability of external conditions, improve the temperature control stability, better meet the user's demand for hot water, and at the same time ensure that the outlet water temperature meets the requirements.

[0082] It should be noted that the CCK water pipe is a high-quality pipe made of HDPE and is a kind of advanced PE pipe.

[0083] Refer to Figure 11 , the system further includes: The first Y capacitor CY1, the second Y capacitor CY2, the first inductor L1, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the rectifier bridge BD1, the optocoupler OP1, and the first capacitor C1; The first Y capacitor CY1, the second Y capacitor CY2, and the first inductor L1 form a common-mode filter circuit and are connected to the mains; The first resistor R1 and the second resistor R2 are connected in series; the third resistor R3 and the fourth resistor R4 are connected in series; The first inductor L1 is connected to the rectifier bridge BD1 through the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4; The rectifier bridge BD1 is connected to the input end of the optocoupler OP1; The first interface at the output end of the optocoupler OP1 is connected to the MCU through the first capacitor C1; the second interface at the output end of the optocoupler is connected to the fifth resistor.

[0084] Preferably, a first switch TP1 is provided between the first interface at the output end of the optocoupler OP1 and the MCU.

[0085] Figure 11 The SCR_INT in [] is the connection interface between the optocoupler OP1 and the MCU.

[0086] It should be noted that the first Y capacitor CY1, the second Y capacitor CY2, and the first inductor L1 form a common-mode filter circuit, which can effectively filter out the interference signals in the power supply grid; Figure 4 CN3 in [] is connected to the live wire of the mains, CN4 is connected to the neutral wire of the mains, and the mains (input range AC90~264V) passes through the first inductor L1, and then through the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 for current limiting (the total series resistance is 204K). The subsequent rectifier bridge BD1 and optocoupler OP1 can ensure that the fifth resistor R5 is used as the pull-up resistor of the optocoupler OP1, and the maximum voltage of the effective zero-crossing signal is output within the full voltage range.

[0087] The voltage signal with a frequency of 50Hz or 60Hz will output a positive double-frequency zero-crossing pulse signal of 100Hz or 120Hz after being rectified by the rectifier bridge, which doubles the number of power pulses detected and controlled by the MCU, and synchronously doubles the temperature control accuracy. Therefore, the first capacitor C1 effectively filters the zero-crossing signal.

[0088] In specific practice, software filtering is also performed: the digital filtering detection frequency limit is effectively limited according to the characteristics of the band-pass filter: 0.732*50Hz~1.367*60Hz, 36.6Hz~82Hz.

[0089] In this embodiment, more effective filtering is performed by combining software and hardware.

[0090] Refer to Figure 12 , the system further includes: The sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the triac Q1, the opto-isolated thyristor OP2, the triode Q2, and the overheat protection relay F1; The first end of the triac Q1 is connected to the mains filtered by the common-mode filter circuit; The second terminal of the triac Q1 is connected to the heat pipe through the overheat protection relay F1; The eighth resistor R8 is in parallel with the ninth resistor R9; The tenth resistor R10 is in parallel with the eleventh resistor R11; The third terminal of the triac Q1 is connected to the first terminal of the opto-isolated thyristor OP2 after passing through the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, and the eleventh resistor R11; The second terminal of the opto-isolated thyristor OP2 is connected to the commercial power filtered by the common-mode filter circuit; The third terminal of the opto-isolated thyristor OP2 is connected to the 5V power supply through the fourteenth resistor; The fourth terminal of the opto-isolated thyristor OP2 is connected to the collector of the triode; The base of the triode Q2 is connected to the MCU through the twelfth resistor R12 and is also grounded through the thirteenth resistor R13; The emitter of the triode Q2 is grounded; A sixth resistor R6, a seventh resistor R7, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4 are connected in parallel between the first terminal and the second terminal of the triac Q1; among them, the sixth resistor R6 and the seventh resistor R7 are in parallel; the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are in parallel.

[0091] Refer to Figure 11 and Figure 12 HOT_L and HOT_N in, the first terminal of the triac Q1 is connected to the commercial power filtered by the common-mode filter circuit.

[0092] Preferably, a second switch TP2 is provided between the base of the triode Q2 and the MCU.

[0093] Figure 12 SCR_Ctrl in is the connection interface between the triode Q2 and the MCU.

[0094] The triac Q1 passes through the zero-crossing point of the opto-isolated thyristor OP2, triggers the opto-isolated thyristor OP2 to drive and output to control the high-power load, the heat pipe. The sixth resistor R6, the seventh resistor R7, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 form an RC absorption circuit of the triac Q1. The eighth resistor R8, the ninth resistor R9, the tenth resistor R10, and the eleventh resistor R11 are used as the drive current-limiting resistors for triggering the opto-isolated thyristor OP2 and the triac Q1. In the case of overload or short circuit of the heat pipe, the overheat protection relay F1 plays a protective role. The MCU power control signal SCR1_Ctrl controls the triode Q2 to drive the opto-isolated thyristor OP2 through the current-limiting twelfth resistor R12 to complete the function of small-signal control of the AC alternating current signal.

[0095] After being limited by the twelfth resistor R12, the thirteenth resistor R13 plays a role in steady-state fixation to control the triode Q2 to drive the opto-isolated thyristor OP2 to complete the zero-crossing triggering of the bidirectional thyristor Q1 to start, thereby realizing the small-signal control function of the AC high-power signal power output control.

[0096] Refer to Figure 9 , the MCU is connected to the host computer through a wired communication method; The MCU is connected to the user terminal through a wireless communication method; The MCU is configured with a control panel; A reversing button for controlling the reversing valve is configured on the control panel; The reversing valve is also connected to a regulated water source. When receiving a reversing instruction from the host computer, the user terminal or the reversing button, it switches the water supply method among the water storage tank, the tap water source and the regulated water source.

[0097] In this technical solution, the reversing valve has three water inlet schemes, namely the water storage tank, the tap water source and the regulated water source. The reversing valve switches among the three water inlet schemes by receiving a reversing instruction from the host computer, the user terminal or the reversing button. In this technical solution, the three water inlet schemes can ensure that the water inlet is basically uninterrupted.

[0098] It should be noted that when there is no regulated water source, generally, after balancing the pressure of the tap water source, the tap water source is used as the water inlet source.

[0099] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not detailed in some embodiments can be referred to the same or similar content in other embodiments.

[0100] It should be noted that in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise stated, the meaning of "a plurality" refers to at least two.

[0101] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment or part of the executable instructions including one or more steps for realizing a specific logical function or process, and the scope of the preferred embodiment of this application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in the reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the technical field to which the embodiments of this application belong.

[0102] It should be understood that each part of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0103] Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0104] In addition, in each embodiment of the present application, each functional unit can be integrated into a processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0105] The above-mentioned storage medium can be a read-only memory, a magnetic disk, an optical disk, etc.

[0106] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0107] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A high power heat pipe control method, characterized in that: include: Monitor the outlet and inlet water temperatures of the heating pipe to obtain the set water temperature; Upon receiving a water outlet instruction, determining whether the water outlet temperature is greater than the set water temperature; If the outlet water temperature is not greater than the set water temperature, the preheating power is calculated according to the outlet water temperature and the set water temperature, and the heat pipe is controlled to perform preheating based on the preheating power; Determine the inlet and outlet water temperature difference based on the outlet water temperature and the inlet water temperature; The steady-state power is calculated according to the inlet and outlet water temperature difference, and after preheating is completed, the heat pipe is heated according to the steady-state power control, and during the heating process, the fluctuation interference to the power grid during heating is reduced by a smooth power output algorithm; When the closed-loop heating condition is met, or when the heat pipe maintains steady-state power heating for a first set time, it switches to closed-loop heating.

2. The method according to claim 1, characterized in that The method further comprises: If the outlet water temperature is greater than the set water temperature, determining whether the required temperature reduction range exceeds a preset temperature reduction threshold; If the required temperature reduction exceeds the preset temperature reduction threshold, the power output of the instant heater is shut down. After the outlet water temperature reaches the preset outlet water condition through drainage cooling, the instant heater pipe is heated according to the steady-state power control. If the required cooling amplitude does not exceed the preset cooling threshold, the cooling heating power is calculated, and the heat pipe is heated according to the cooling heating power control. After the outlet water temperature reaches the preset outlet water condition through drainage cooling, the heat pipe is heated according to the steady-state power control.

3. The method according to claim 1, characterized in that: The closed-loop heating comprises: Determine the change of the inlet and outlet water temperature difference within a second set time period; If the absolute value of the inlet and outlet water temperature difference is not greater than the first temperature difference threshold within the second set time, the closed-loop heating is terminated; If the absolute value of the inlet and outlet water temperature difference is greater than the first temperature difference threshold within the second set time period, determine whether the absolute value of the inlet and outlet water temperature difference is greater than the second temperature difference threshold; If the absolute value of the inlet and outlet water temperature difference is greater than the second temperature difference threshold, the heat pipe is heated according to the steady-state power control; If the absolute value of the inlet and outlet water temperature difference is not greater than the second temperature difference threshold and has not reached the third set time, the heat pipe is heated according to the steady-state power control; If the absolute value of the inlet and outlet water temperature difference is not greater than the second temperature difference threshold and reaches the third set time, the closed-loop heating is terminated; When the heating of the heat pipe according to the steady-state power control reaches the fourth set time, the closed-loop heating is terminated.

4. The method according to claim 1, characterized in that: The smooth power output algorithm includes: Determine the power array length and the number of AC frequency components according to the rated AC frequency; Get the current power value of the instant heater; Divide the full power value of the instant heater equally to obtain the length of each power array. Set the first judgment position of the power array to 0 and the current judgment position to i. Evenly distribute the current power values ​​of the instant heaters into the power array in order; When the zero-crossing interruption occurs, the thyristor is controlled to open and the instantaneous heater power is controlled; Get the interrupt entry count. When the interrupt entry count exceeds the full power value of the instant heater, reset the interrupt entry count to 0. Calculate the remainder G-Value of the quotient of the number of interruption entry times and the number of AC frequency components; When entering the interrupt, determine whether the remainder G-Value is greater than the current judgment position i of the power array; If the remainder G-Value is greater than the current judgment position i of the power array, the control of the thyristor and the instant heater power is turned off; If the remainder G-Value is not greater than the current judgment position i of the power array, the control of the thyristor and the instant heater power is maintained; Whenever the remainder G-Value cycles to a value of 0, the current judgment position i of the power array is incremented by one position until the end.

5. The method according to claim 1, characterized in that The smooth power output algorithm includes: Get the current power of the instant heater; If the current power of the instant heater is 0, or the current power of the instant heater exceeds the power corresponding to the rated AC frequency, determine whether the power output half cycle number is 0; If the power output half cycle number is 0, no heating will be performed and the control of the thyristor and instant heater power will be terminated; If the power output half cycle number is not 0, determine whether the power output half cycle number exceeds the AC power frequency; If the power output half cycle number exceeds the AC frequency, the instant heater is controlled to heat according to the power corresponding to the rated AC frequency; If the current power of the instant heater is not 0, and the current power of the instant heater does not exceed the power corresponding to the rated AC power frequency, the required power output wave number is determined according to the rated AC power frequency; Determine power array data; Acquire a heating control pulse array according to the power array data; Determine whether a control end condition is met; the control end condition is that the current power of the instant heater exceeds the power corresponding to the rated AC power frequency; If the control end condition is not reached, each time the interruption is entered, a value is sequentially extracted from the heating control pulse array to control the power of the thyristor and the instant heater; The loop is executed, and when the number of bits of the currently extracted value in the heating control pulse array exceeds the corresponding value of the rated AC power frequency, the loop is reset until the control end condition is reached.

6. The method according to claim 1, characterized in that The method further comprises: Monitor the water flow at the water inlet of the heating pipe; Calculate the target control pulse width according to the monitored water flow, set water flow and the number of us counted by the clock; Determine the pulse interval of the flow meter; When the pulse interval is greater than the target control pulse width, the working voltage of the water pump is reduced and the pulse interval is shortened; when the pulse interval is not greater than the target control pulse width, the working voltage of the water pump is increased and the pulse interval is increased; When the absolute value of the difference between the pulse interval and the target control pulse width is greater than the water inflow abnormality threshold, it is determined that the current machine has water inflow abnormality, and the heat pipe control power is reduced until the absolute value of the difference between the pulse interval and the target control pulse width is 0; When the absolute value of the difference between the pulse interval and the target control pulse width is not greater than the water inlet abnormality threshold, it is determined that the current machine water inlet is normal and heating is resumed.

7. The method according to claim 6, characterized in that Calculating the preheating power according to the outlet water temperature and the set water temperature includes: Calculate the preheating power based on the preheating time, power gain, set water temperature, water outlet temperature, specific heat capacity, water storage capacity of the heat pipe and heating efficiency of the heat pipe; Calculating the steady-state power according to the inlet and outlet water temperature difference includes: The steady-state power is calculated based on the monitored water flow rate, specific heat capacity, inlet and outlet temperature difference and the heating efficiency of the heat pipe.

8. The method according to claim 6, characterized in that The method further comprises: When the outlet water temperature is higher than the high temperature alarm threshold value for a fifth set time period, a high temperature alarm is issued; Acquire water pump voltage slope data, and when the water pump voltage slope exceeds the water pump alarm threshold within a sixth preset time period, issue a water pump alarm; When the flow meter loses the pulse signal for more than the seventh preset time, a water shortage alarm is issued; Obtain the water level data in the water tank. When the water level in the water tank is lower than the water level threshold, issue a water shortage alarm and adjust the water output of the water pump; The water level data in the instant heater is obtained before the instant heater is started, and when the water level in the instant heater is lower than the water level threshold, a water shortage alarm is issued.

9. The method according to claim 8, characterized in that After the water shortage alarm is performed, the method further comprises: The instant heating pipe is controlled to stop heating, and after maintaining the eighth preset time, the water pump is controlled to stop working, and the gas in the empty pipe area is transferred to the top of the instant heating pipe to replenish water to the instant heating pipe.

10. The method according to claim 1, characterized in that The method further comprises: Record the steady-state power required to reach the set water temperature when the instantaneous heater was working last time; After receiving the current water outlet command and executing preheating, if the current set water temperature does not change, the heat pipe is heated according to the recorded steady-state power control; If the current set water temperature changes, the recorded steady-state power is adjusted according to the ratio of the current set water temperature to the last set water temperature to obtain the current required steady-state power.

11. A high power heat pipe temperature control system, characterized in that: include: Water storage tank, water pump inlet pipe, flow meter, flow meter inlet pipe, reversing valve, reversing valve inlet pipe, plate-penetrating joint, CCK pipe, pressure balancer, transition water tank inlet pipe, one-way valve, transition water tank, instant heating pipe outlet pipe, transition water tank outlet pipe, stainless steel outlet pipe, instant heating pipe, instant heating pipe inlet pipe, water pump and MCU; The water inlet pipe of the heating pipe is internally provided with a first temperature sensor; The water outlet pipe of the heating pipe has a built-in second temperature sensor; The reversing valve is connected to the water storage tank via the reversing valve water inlet pipe; and is also connected to the flow meter via the flow meter water inlet pipe; The water pump is connected to the flow meter via the water pump water inlet pipe; and is also connected to the instant heating pipe via the instant heating pipe water inlet pipe; The one-way valve is connected to the instant heating pipe through the instant heating pipe water inlet pipe; and is also connected to the transition water tank through the transition water tank water inlet pipe; The transition water tank is connected to the stainless steel water outlet pipe through the transition water tank water outlet pipe to discharge water; One end of the CCK tube is connected to a tap water source, and the other end passes through the pressure balancer and is connected to the reversing valve through the through-plate joint; The MCU is electrically connected to the flow meter, the water pump, the first temperature sensor, the second temperature sensor and the heat pipe; The MCU is used to execute the high-power heat pipe control method as described in any one of claims 1-10.

12. The high-power heat pipe temperature control system according to claim 11, characterized in that: The system further comprises: A first Y capacitor, a second Y capacitor, a first inductor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a rectifier bridge, an optocoupler and a first capacitor; The first Y capacitor, the second Y capacitor and the first inductor form a common mode filter circuit connected to the mains; The first resistor and the second resistor are connected in series; the third resistor and the fourth resistor are connected in series; The first inductor is connected to the rectifier bridge through the first resistor, the second resistor, the third resistor, and the fourth resistor; The rectifier bridge is connected to the input end of the optical coupler; The first interface of the optocoupler output end is connected to the MCU via the first capacitor; and the second interface of the optocoupler output end is connected to the fifth resistor.

13. The high-power heat pipe temperature control system according to claim 12, characterized in that: The system further comprises: a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a second capacitor, a third capacitor, a fourth capacitor, a bidirectional thyristor, a photoelectric isolation thyristor, a triode and an overheat protection relay; The first end of the bidirectional thyristor is connected to the mains power after being filtered by the common mode filter circuit; The second end of the bidirectional thyristor is connected to the instant heat pipe through the overheat protection relay; The eighth resistor is connected in parallel with the ninth resistor; The tenth resistor is connected in parallel with the eleventh resistor; The third end of the bidirectional thyristor is connected to the first end of the photoelectric isolation thyristor through the eighth resistor, the ninth resistor, the tenth resistor and the eleventh resistor; The second end of the photoelectric isolation thyristor is connected to the mains power after being filtered by the common mode filter circuit; The third end of the photoelectric isolation thyristor is connected to a 5V power supply through the fourteenth resistor; The fourth end of the photoelectric isolation thyristor is connected to the collector of the triode; The base of the transistor is connected to the MCU through the twelfth resistor and is also grounded through the thirteenth resistor; The emitter of the triode is grounded; The sixth resistor, the seventh resistor, the second capacitor, the third capacitor and the fourth capacitor are connected in parallel between the first end and the second end of the bidirectional thyristor; wherein the sixth resistor and the seventh resistor are connected in parallel; and the second capacitor, the third capacitor and the fourth capacitor are connected in parallel.

14. The high-power heat pipe temperature control system according to claim 11, characterized in that: The MCU is connected to the host computer via wired communication; The MCU is connected to the user terminal via wireless communication; The MCU is provided with a control panel; The control panel is provided with a reversing button for controlling the reversing valve; The reversing valve is also connected to a pressure-stabilized water source, and when receiving a reversing instruction from a host computer, a user terminal or a reversing button, the water supply mode is switched between a water tank, a tap water source and a pressure-stabilized water source.

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