A high-power heat pipe control method and temperature control system

Abstract

The present application relates to a high-power instant heat pipe control method and temperature control system, the method comprising: when heating the water in the instant heater, a segmented heating method is adopted, firstly the water temperature is raised to a temperature close to the set temperature by preheating, and then the water temperature is maintained at the set temperature by steady-state heating. The main purpose of preheating is to increase the temperature climbing speed and shorten the temperature steady-state time. When the instant heat pipe maintains steady-state power heating for a first set time, closed-loop heating is performed. Closed-loop heating can improve the ability to resist interference from external conditions and improve the stability of temperature control. In this technical solution, the purpose of first performing open-loop heating and then entering closed-loop heating is to discharge the "stored water" in the instant heat pipe and avoid oscillations caused by direct closed-loop heating. In addition, in this technical solution, a smooth power output algorithm is used to achieve more stable power output, reducing the fluctuation interference caused to the power grid by the instant heat pipe heating.

Description

Technical Field

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

[0002] Common instant heaters on the market include: nanofilm, thick film, ceramic, boiler, etc., which are usually controlled by high-power thyristors and adopt a rough heating and temperature control method with segmented power output. The heating and temperature control method of this instant heater is difficult to meet users' demand for hot water. Summary of the Invention

[0003] In order to at least to some extent overcome the problem that instant heaters in related technologies are difficult to meet users' demand for hot water, the present application provides a high-power instant heater control method and temperature control system.

[0004] The scheme of this application is as follows:

[0005] According to a first aspect of an embodiment of the present application, a high-power heat pipe control method is provided, comprising:

[0006] Monitor the outlet and inlet water temperatures of the heating pipe to obtain the set water temperature;

[0007] Upon receiving the water outlet instruction, determining whether the outlet water temperature is greater than the set water temperature;

[0008] 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 heat pipe to preheat based on the preheating power;

[0009] Determine the inlet and outlet water temperature difference based on the outlet water temperature and inlet water temperature;

[0010] 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;

[0011] When the heating pipe maintains steady-state power heating for a first set time, it switches to closed-loop heating;

[0012] The method further comprises:

[0013] If the outlet water temperature is greater than the set water temperature, determining whether the required cooling range exceeds a preset cooling threshold;

[0014] If the required cooling range exceeds the preset cooling threshold, the power output of the instantaneous heater is shut down. After the outlet water temperature reaches the preset outlet water condition through drainage cooling, the instantaneous heater is heated according to the steady-state power control.

[0015] If the required cooling range does not exceed the preset cooling threshold, the cooling and heating power is calculated, and the heat pipe is heated according to the cooling and 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;

[0016] The closed-loop heating comprises:

[0017] Determine the change in the inlet and outlet water temperature difference within a second set time period;

[0018] 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;

[0019] 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;

[0020] If the absolute value of the inlet and outlet water temperature difference is greater than the second temperature difference threshold, heating is performed according to the steady-state power control, i.e., the heat pipe;

[0021] 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, heating is performed according to the steady-state power control, i.e., the heat pipe;

[0022] 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;

[0023] When the steady-state power control, that is, the heat pipe performs heating for a fourth set time, the closed-loop heating is terminated.

[0024] Preferably, the smooth power output algorithm includes:

[0025] Determine the power array length and the number of AC frequency components based on the rated AC frequency;

[0026] Get the current power value of the instant heater;

[0027] 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;

[0028] Evenly distribute the current power values ​​of the instantaneous heaters into the power array in order;

[0029] When the zero-crossing interruption occurs, the thyristor is controlled to open and the instantaneous heater power is controlled;

[0030] 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.

[0031] Calculate the remainder G-Value of the quotient of the number of interruption entries and the number of AC frequency components;

[0032] When entering the interrupt, determine whether the remainder G-Value is greater than the current judgment position i of the power array;

[0033] If the remainder G-Value is greater than the current judgment position i of the power array, the control of the thyristor and the instantaneous heater power is turned off;

[0034] If the remainder G-Value is not greater than the current judgment position i of the power array, the control of the thyristor and instant heater power is maintained;

[0035] Whenever the remainder G-Value cycles to a value of 0, the current judgment position i of the power array is incremented by one until the end.

[0036] Preferably, the smooth power output algorithm includes:

[0037] Get the current power of the instant heater;

[0038] If the current power of the instantaneous heater is 0, or the current power of the instantaneous heater exceeds the power corresponding to the rated AC frequency, determine whether the power output half cycle number is 0;

[0039] 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;

[0040] If the power output half cycle is not 0, determine whether the power output half cycle exceeds the AC frequency;

[0041] If the power output half cycle number exceeds the AC frequency, the heater will be controlled to heat according to the power corresponding to the rated AC frequency;

[0042] If the current power of the instantaneous heater is not 0 and does not exceed the power corresponding to the rated AC frequency, the required power output wave number is determined according to the rated AC frequency;

[0043] Determine power array data;

[0044] Obtaining a heating control pulse array according to power array data;

[0045] 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 frequency;

[0046] If the control end condition is not met, each time an interrupt is entered, a value is sequentially extracted from the heating control pulse array to control the power of the thyristor and the instant heater;

[0047] 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 a control end condition is reached.

[0048] Preferably, the method further comprises:

[0049] Monitor the water flow at the water inlet of the heat pipe;

[0050] Calculate the target control pulse width based on the monitored water flow, set water flow and the number of us counted by the clock;

[0051] Determine the pulse interval of the flow meter;

[0052] When the pulse interval is greater than the target control pulse width, the operating 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 operating voltage of the water pump is increased and the pulse interval is increased;

[0053] 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;

[0054] 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 water inlet of the machine is normal and heating is resumed.

[0055] Preferably, calculating the preheating power according to the outlet water temperature and the set water temperature includes:

[0056] 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;

[0057] Calculating the steady-state power according to the inlet and outlet water temperature difference includes:

[0058] 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.

[0059] Preferably, the method further comprises:

[0060] When the outlet water temperature is higher than the high temperature alarm threshold for a fifth set time period, a high temperature alarm is issued;

[0061] Acquire water pump voltage slope data, and when the water pump voltage slope exceeds a water pump alarm threshold within a sixth preset time period, issue a water pump alarm;

[0062] When the flow meter loses the pulse signal for more than the seventh preset time, a water shortage alarm is issued;

[0063] Obtain water level data in the water tank. When the water level in the water tank is lower than the water level threshold, a water shortage alarm is issued and the water output of the water pump is adjusted;

[0064] The water level data in the instantaneous heater is obtained before the heater is started, and a water shortage alarm is issued when the water level in the instantaneous heater is lower than the water level threshold.

[0065] Preferably, after the water shortage alarm is issued, the method further comprises:

[0066] 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.

[0067] Preferably, the method further comprises:

[0068] Record the steady-state power required to reach the set water temperature when the instantaneous heater was working last time;

[0069] After receiving the current water output instruction 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;

[0070] 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.

[0071] According to a second aspect of an embodiment of the present application, a high-power heat pipe temperature control system is provided, comprising:

[0072] Water storage tank, water pump inlet pipe, flow meter, flow meter inlet pipe, reversing valve, reversing valve inlet pipe, plate connector, 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;

[0073] The water inlet pipe of the heating pipe is built with a first temperature sensor;

[0074] The water outlet pipe of the heating pipe is built with a second temperature sensor;

[0075] The reversing valve is connected to the water tank via the reversing valve water inlet pipe; and is also connected to the flow meter via the flow meter water inlet pipe;

[0076] The water pump is connected to the flow meter via the water pump inlet pipe; and is also connected to the instant heating pipe via the instant heating pipe inlet pipe;

[0077] 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;

[0078] The transition water tank is connected to the stainless steel water outlet pipe through the transition water tank outlet pipe to discharge water;

[0079] One end of the CCK tube 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 plate connector;

[0080] The MCU is electrically connected to the flow meter, the water pump, the first temperature sensor, the second temperature sensor and the heat pipe;

[0081] The MCU is used to execute the high-power heat pipe temperature control system control method as described in any of the above items.

[0082] Preferably, the system further comprises:

[0083] 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;

[0084] The first Y capacitor, the second Y capacitor and the first inductor form a common mode filter circuit connected to the mains;

[0085] The first resistor and the second resistor are connected in series; the third resistor and the fourth resistor are connected in series;

[0086] The first inductor is connected to the rectifier bridge through the first resistor, the second resistor, the third resistor, and the fourth resistor;

[0087] The rectifier bridge is connected to the input end of the optocoupler;

[0088] The first interface of the optocoupler output end is connected to the MCU via the first capacitor; the second interface of the optocoupler output end is connected to the fifth resistor.

[0089] Preferably, the system further comprises:

[0090] 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 transistor, and an overheat protection relay;

[0091] The first end of the bidirectional thyristor is connected to the mains power after being filtered by the common mode filter circuit;

[0092] The second end of the bidirectional thyristor is connected to the heating pipe through the overheat protection relay;

[0093] The eighth resistor and the ninth resistor are connected in parallel;

[0094] The tenth resistor and the eleventh resistor are connected in parallel;

[0095] 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;

[0096] The second end of the photoelectric isolation thyristor is connected to the mains power after being filtered by the common mode filter circuit;

[0097] The third terminal of the photoelectric isolation thyristor is connected to a 5V power supply through the fourteenth resistor;

[0098] The fourth end of the photoelectric isolation thyristor is connected to the collector of the triode;

[0099] The base of the transistor is connected to the MCU via the twelfth resistor and is also grounded via the thirteenth resistor;

[0100] The emitter of the triode is grounded;

[0101] 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.

[0102] Preferably, the MCU is connected to the host computer via wired communication;

[0103] The MCU is connected to the user terminal via wireless communication;

[0104] The MCU is equipped with a control panel;

[0105] The control panel is provided with a reversing button for controlling the reversing valve;

[0106] 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.

[0107] The technical solution provided by this application may have the following beneficial effects:

[0108] The control method of the high-power instant heat pipe temperature control system in the present 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 water outlet instruction, judging 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 preheat based on the preheating power; determining the inlet and outlet water temperature difference according to the outlet water temperature and the inlet water temperature; calculating the steady-state power according to the inlet and outlet water temperature difference, controlling the instant heat pipe to heat according to the steady-state power after the preheating is completed, and reducing the fluctuation interference to the power grid during heating by using a smooth power output algorithm during the heating process; when the instant heat pipe maintains steady-state power heating for a first set time, switching to closed-loop heating.

[0109] When heating the water in the instant heater, the present technical solution adopts a segmented heating method. The water temperature is first raised to a temperature close to the set temperature through preheating, and then the water temperature is maintained at the set temperature through steady-state heating. The main purpose of preheating is to increase the temperature climbing speed and shorten the temperature steady-state time. When the instant heater maintains steady-state power heating for the first set time, closed-loop heating is performed. Closed-loop heating can improve the ability to resist interference from external conditions and improve the stability of temperature control. The purpose of first performing open-loop heating and then entering closed-loop heating in the present technical solution is to discharge the "stored water" in the instant heater and avoid oscillations caused by direct closed-loop heating. In addition, the present technical solution achieves more stable power output through a smooth power output algorithm, reducing the fluctuation interference caused to the power grid by the instant heater heating.

[0110] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0111] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0112] Figure 1 This is a flow chart of a method for controlling a high-power heat pipe temperature control system provided by one embodiment of the present application;

[0113] Figure 2 This is a flow chart of another high-power heat pipe temperature control system control method provided by one embodiment of the present application;

[0114] Figure 3 This is a schematic diagram of a closed-loop heating process in a high-power heat pipe temperature control system control method provided by an embodiment of the present application;

[0115] Figure 4 This is a flow chart of a second smooth power output algorithm in a high-power heat pipe temperature control system control method provided by one embodiment of the present application;

[0116] Figure 5 This is a schematic diagram of the water outlet constant flow control process in a high-power heat pipe temperature control system control method provided by an embodiment of the present application.

[0117] Figure 6 This is a schematic diagram of anti-dry-burn water replenishment in a high-power heat pipe temperature control system control method provided by one embodiment of the present application;

[0118] Figure 7 This is a schematic diagram of segmented heating in a high-power heat pipe temperature control system control method provided by one embodiment of the present application;

[0119] Figure 8 This is a schematic structural diagram of a high-power heat pipe temperature control system provided by one embodiment of the present application;

[0120] Figure 9 This is a circuit diagram of a high-power heat pipe temperature control system provided by one embodiment of the present application;

[0121] Figure 10 This is a working diagram of a high-power heat pipe temperature control system provided by one embodiment of the present application;

[0122] Figure 11 This is a circuit diagram of the rectifier and filter part of a high-power heat pipe temperature control system provided by one embodiment of the present application;

[0123] Figure 12 This is a circuit diagram of a bidirectional thyristor in a high-power heat pipe temperature control system provided by an embodiment of the present application.

[0124] Figure 1: Water tank 1; water pump inlet pipe 2; flow meter 3; flow meter inlet pipe 4; reversing valve 5; reversing valve inlet pipe 6; plate-through joint 7; CC pipe 8; pressure balancer 9; transition water tank inlet pipe 10; one-way valve 11; transition water tank 12; heat pipe outlet pipe 13; transition water tank outlet pipe 14; stainless steel outlet pipe 15; heat pipe 16; 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; Opto-isolating thyristor - OP2; Transistor - Q2; Overheat protection relay - F1. DETAILED DESCRIPTION

[0125] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0126] A high-power heat pipe control method, comprising:

[0127] S11: Monitor the outlet water temperature and inlet water temperature of the heating pipe to obtain the set water temperature;

[0128] S12: upon receiving the water outlet command, determining whether the outlet water temperature is greater than the set water temperature;

[0129] S13: 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 preheating of the heating pipe is controlled based on the preheating power;

[0130] S14: Determine the inlet and outlet water temperature difference based on the outlet water temperature and the inlet water temperature;

[0131] S15: Calculate the steady-state power based on the inlet and outlet water temperature difference. After preheating is completed, heat the heat pipe according to the steady-state power control. During the heating process, a smooth power output algorithm is used to reduce the fluctuation interference caused by heating to the power grid.

[0132] S16: When the heating pipe maintains steady-state power heating for a first set time, switching to closed-loop heating.

[0133] It should be noted that, referring to Figure 2 , the method further comprises:

[0134] S21: If the outlet water temperature is greater than the set water temperature, determine whether the required cooling range exceeds the preset cooling threshold;

[0135] S22: If the required cooling range exceeds the preset cooling threshold, the power output of the instantaneous heater is shut down. After the outlet water temperature reaches the preset outlet water condition through drainage cooling, the instantaneous heater is heated according to the steady-state power control.

[0136] S23: If the required cooling range does not exceed the preset cooling threshold, the cooling and heating power is calculated, and the heat pipe is heated according to the cooling and 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.

[0137] It should be noted that this technical solution requires monitoring the outlet and inlet water temperatures of the heat pipe (monitored by temperature sensors) and obtaining the set water temperature (set by the host computer or user terminal).

[0138] After starting the water pumping function, the water outlet command is received. At this time, it is determined whether the water outlet temperature is greater than the set water temperature. If the water outlet temperature is not greater than the set water temperature, it means that the water in the instant heater needs to be heated.

[0139] In this technical solution, when heating the water in the instant heater, a segmented heating method is adopted. The water temperature is first raised to a temperature close to the set water temperature through preheating, and then the water temperature is maintained at the set water temperature through steady-state heating.

[0140] The main purpose of preheating is to increase the temperature climbing speed and shorten the temperature steady-state time.

[0141] In actual practice, the specific formula for calculating the preheating power is as follows 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:

[0142] Preheating power = (water storage capacity of the heat pipe / preheating time * power gain) * (set water temperature - water outlet temperature) * specific heat capacity / heating efficiency of the heat pipe.

[0143] The preheating time is determined by the initial value of the outlet water temperature (1s for temperatures above 70°C, 2s for temperatures above 40°C, and 3s for temperatures below 40°C).

[0144] The power gain defaults to 1 and is used to adjust the temperature rise response speed. The larger the value, the steeper the temperature rise.

[0145] The heat pipe efficiency is a parameter of the heat pipe itself and can be calibrated by the user.

[0146] The specific formula for calculating the steady-state power based on the water flow rate monitored by the flow meter, specific heat capacity, inlet and outlet water temperature difference, and the heating efficiency of the heat pipe is:

[0147] Steady-state power = water flow rate * specific heat capacity * (outlet water temperature - inlet water temperature) / heat pipe heating efficiency.

[0148] Example: If the specific heat capacity is 4.2 J / g*℃, the water flow rate is 3.5 ml / s, the temperature rise is 75°C, and the efficiency is 95%, then the steady-state power is 1160.53.

[0149] When the heat pipe maintains steady-state power heating for the first set time, closed-loop heating is executed. This indicates an open-loop control timeout, requiring PID intervention. When this condition is triggered, the system switches to closed-loop heating, which improves resistance to external interference and enhances temperature control stability.

[0150] In specific practice, the first set time length may be 4 seconds.

[0151] 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, the outlet water temperature needs to be lowered to meet the demand. The solution for lowering the outlet water temperature in this embodiment is:

[0152] Determine whether the required cooling range exceeds the preset cooling threshold. The preset cooling threshold can be 1°C. When the required cooling range exceeds the preset cooling threshold (for example, if the outlet water temperature is 100°C and the set water temperature is 95°C, a 5°C cooling is required), the power output of the instant heater is directly shut down due to the large cooling range. After the outlet water temperature reaches the preset water outlet condition through drainage, the instant heater is heated according to the steady-state power control.

[0153] The default water outlet condition here is set to be close to the outlet water temperature, with a range of no more than 1°C from the outlet water temperature.

[0154] When the required cooling range does not exceed the preset cooling threshold (for example, the outlet water temperature is 96°C, the set water temperature is 95°C, and the temperature needs to be reduced by 1°C), since the cooling range is small, the cooling heating power can be calculated, and the heat pipe is controlled to heat according to the cooling heating power. After the outlet water temperature reaches the preset water outlet condition through drainage, the heat pipe is heated according to the steady-state power control.

[0155] The cooling and heating power here can be half of the steady-state power. For example, if the steady-state power is 60W, the cooling and heating power can be 30W.

[0156] It should be noted that, in this embodiment, the purpose of first performing open-loop heating and then entering closed-loop heating is to discharge the "water" in the heat pipe and avoid oscillation caused by directly performing closed-loop heating.

[0157] When heating the water in the instant heater, the present technical solution adopts a segmented heating method. The water temperature is first raised to a temperature close to the set temperature through preheating, and then the water temperature is maintained at the set temperature through steady-state heating. The main purpose of preheating is to increase the temperature climbing speed and shorten the temperature steady-state time. When the instant heater maintains steady-state power heating for the first set time, closed-loop heating is performed. Closed-loop heating can improve the ability to resist interference from external conditions and improve the stability of temperature control. The purpose of first performing open-loop heating and then entering closed-loop heating in the present technical solution is to discharge the "stored water" in the instant heater and avoid oscillations caused by direct closed-loop heating. In addition, the present technical solution achieves more stable power output through a smooth power output algorithm, reducing the fluctuation interference caused to the power grid by the instant heater heating.

[0158] Example 2

[0159] It should be noted that, referring to Figure 3 , closed-loop heating, including:

[0160] Determine the change in the inlet and outlet water temperature difference within a second set time period;

[0161] 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;

[0162] 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;

[0163] If the absolute value of the inlet and outlet water temperature difference is greater than the second temperature difference threshold, heating is performed according to the steady-state power control, i.e., the heat pipe;

[0164] 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, heating is performed according to the steady-state power control, i.e., the heat pipe;

[0165] 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;

[0166] When the steady-state power control, that is, the heat pipe performs heating for a fourth set time, the closed-loop heating is terminated.

[0167] In specific practice, the second set time is 4s, the first temperature difference threshold is ±3°C, the second temperature difference threshold is ±7°C, the third set time is 4s, and the fourth set time is 8s.

[0168] In this embodiment, closed-loop heating, ignoring water shortages, first determines whether the inlet and outlet water temperature difference is greater than ±3°C within 4 seconds. If it is not, no adjustment is required and closed-loop heating can be terminated. If the inlet and outlet water temperature difference is greater than ±3°C within 4 seconds, the system then determines whether it is greater than ±7°C. If it is, the temperature difference is significant and requires a longer heating period (8 seconds). If it is less than ±7°C, the temperature difference is small and requires a shorter heating period (4 seconds).

[0169] Example 3

[0170] It should be noted that in this technical solution, two smooth power output algorithms can be used to achieve more stable power output, thereby reducing the fluctuation interference to the power grid caused by the heating pipe.

[0171] The first smooth power output algorithm includes:

[0172] Determine the power array length and the number of AC frequency components based on the rated AC frequency;

[0173] Get the current power value of the instant heater;

[0174] 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;

[0175] Evenly distribute the current power values ​​of the instantaneous heaters into the power array in order;

[0176] When the zero-crossing interruption occurs, the thyristor is controlled to open and the instantaneous heater power is controlled;

[0177] 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.

[0178] Calculate the remainder G-Value of the quotient of the number of interruption entries and the number of AC frequency components;

[0179] When entering the interrupt, determine whether the remainder G-Value is greater than the current judgment position i of the power array;

[0180] If the remainder G-Value is greater than the current judgment position i of the power array, the control of the thyristor and the instantaneous heater power is turned off;

[0181] If the remainder G-Value is not greater than the current judgment position i of the power array, the control of the thyristor and instant heater power is maintained;

[0182] Whenever the remainder G-Value cycles to a value of 0, the current judgment position i of the power array is incremented by one until the end.

[0183] The first smoothing power output algorithm is described as follows:

[0184] Based on the heat capacity ratio of water, the current power value of the instantaneous heater is calculated. For 50Hz and 60Hz AC frequencies, after passing through the hardware rectifier bridge, the full power value in 1s is 100 and 120 respectively (50Hz has 100 zero crossings after rectification; similarly, 60Hz has 120 zero crossings). To reduce the impact of power control on the power grid, the first smooth power output algorithm is used to reduce the impact, as follows:

[0185] Step 1: Divide the full power value into 5 parts (50Hz) and 6 parts (60Hz). The power array length is 20. The current judgment position of the power array is i, and it is 0 for the first time.

[0186] Step 2: Evenly distribute the current power value of the instant heater into the power array in order. Example: Assume that the current power value of the instant heater is 73. The loop is repeated three times, and 20 power values ​​are filled in the array at a time. There are 13 power values ​​left. After the fourth loop, the power array HeatParaStru.PowerPluse is obtained. The first 13 data are looped four times, and the last 7 data are looped three times. The power array HeatParaStru.PowerPluse={4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3} is obtained.

[0187] Step 3: When the zero-crossing interrupt comes, the thyristor is turned on and the instantaneous heater power is controlled. The number of interrupts is reserve_cnt. When the reserve_cnt value exceeds the full power value, it is reset to 0. The number of parts of the AC frequency is E-Count(HeatParaStru.AcFreg / 10), and its value is 5 or 6 (for 50hz or 60Hz). The number of parts array F-Array can be obtained.

[0188] Step 4: Take the remainder G-Value

[0189] G-Value=(reserve_cnt / E-Count), the G-Value range is [0, 1, 2, 3, 4] or [0, 1, 2, 3, 4, 5] for 50Hz and 60Hz.

[0190] Step 5: When entering the interrupt, determine whether the G-Value is greater than the i-th position data of the power array. If yes, turn off the control; otherwise, turn on the control.

[0191] Step 6: Each time the G-Value loop reaches 0, the judgment position i in the power array is incremented by one until the end.

[0192] Reference Figure 4 , the second smooth power output algorithm includes:

[0193] Get the current power of the instant heater;

[0194] If the current power of the instantaneous heater is 0, or the current power of the instantaneous heater exceeds the power corresponding to the rated AC frequency, determine whether the power output half cycle number is 0;

[0195] 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;

[0196] If the power output half cycle is not 0, determine whether the power output half cycle exceeds the AC frequency;

[0197] If the power output half cycle number exceeds the AC frequency, the heater will be controlled to heat according to the power corresponding to the rated AC frequency;

[0198] If the current power of the instantaneous heater is not 0 and does not exceed the power corresponding to the rated AC frequency, the required power output wave number is determined according to the rated AC frequency;

[0199] Determine power array data;

[0200] Obtaining a heating control pulse array according to power array data;

[0201] Determine whether the control end condition is met; the control end condition is that the current power of the instantaneous heater exceeds the power corresponding to the rated AC frequency;

[0202] If the control end condition is not met, each time an interrupt is entered, a value is sequentially extracted from the heating control pulse array to control the power of the thyristor and the instant heater;

[0203] 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 a control end condition is reached.

[0204] Figure 4 In the equation, heater war.ac_freq represents the AC frequency, and heater_var.plue_cnt represents the required power output wave number.

[0205] The second smooth power output algorithm first determines whether the current power of the heater is 0, that is, whether the current power of the heater exceeds the power corresponding to the rated AC power frequency.

[0206] If the current power of the instantaneous heater is 0, it means that the current user demand is normal water temperature and no heating is required.

[0207] If the current power of the heater exceeds the power corresponding to the rated AC frequency, it indicates a power abnormality.

[0208] When one of these two conditions is met, it is determined whether the power output half cycle is 0. If the power output half cycle is 0, no heating is performed and the control of the thyristor and the instant heater power is terminated; if the power output half cycle is not 0, it is determined whether the power output half cycle exceeds the AC frequency; if the power output half cycle exceeds the AC frequency, the instant heater is controlled to heat according to the power corresponding to the rated AC frequency.

[0209] When these two conditions are not met, it means that heating is carried out normally, and the required power output wave number is determined according to the rated AC power frequency. For example, if the rated AC power frequency is 50, the required power output wave number may be 32.

[0210] Determine the power array data [6, 6, 6, 6, 8].

[0211] According to the power array data, obtain the heating control pulse array PoweroutModecount=[1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,0,0].

[0212] Determine whether the 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 frequency; if the control end condition is not met, each time an interrupt is entered, extract a value from the heating control pulse array in turn to control the thyristor and the instant heater power; execute the loop, and when the number of bits of the currently extracted value in the heating control pulse array exceeds the value corresponding to the rated AC frequency, reset the loop until the control end condition is met.

[0213] After applying the smooth power output algorithm, the experimental data is as follows:

[0214] Under a 220V / 50Hz voltage power supply, the power required to maintain a 20% power screen cycle for 1S is: 312.5W;

[0215] Under a 220V / 50Hz voltage power supply, the power required to maintain a 23% power screen cycle for 1S is: 350.1W;

[0216] Under a 220V / 50Hz voltage power supply, the power required to maintain a 50% power screen cycle for 0.5S is: 805.8W;

[0217] Under a 220V / 50Hz voltage power supply, the power required to maintain a 70% power screen cycle for 1S is: 1095W;

[0218] Under a 220V / 60Hz voltage power supply, the power required to maintain a 20% power screen cycle for 1S is: 293.4W;

[0219] Under a 220V / 60Hz voltage power supply, the power required to maintain a 23% power screen cycle for 1S is: 392.3W;

[0220] Under a 220V / 60Hz voltage power supply, the power required to maintain a 50% power screen cycle for 0.5S is: 733.9W;

[0221] Under a 220V / 60Hz voltage power supply, the power required to maintain a 70% power screen cycle for 1S is: 1016W;

[0222] Under a 220V / 50Hz voltage power supply, the power required to maintain a 0-power screen cycle for 1S is: 2.269W;

[0223] Under a 220V / 50Hz voltage power supply, the power required to maintain a full-power screen cycle for 1S is: 1574W;

[0224] Under a 220V / 60Hz voltage power supply, the power required to maintain a 0 screen cycle for 1S is: 2.123W;

[0225] Under a voltage power supply of 220V / 60Hz, the power required to maintain a full-power screen cycle for 1S is: 1490W.

[0226] Example 4

[0227] It should be noted that the method also includes:

[0228] Monitor the water flow at the water inlet of the heat pipe;

[0229] Calculate the target control pulse width based on the monitored water flow, set water flow and the number of us counted by the clock;

[0230] Determine the pulse interval of the flow meter;

[0231] When the pulse interval is greater than the target control pulse width, reduce the working voltage of the water pump and shorten the pulse interval; when the pulse interval is not greater than the target control pulse width, increase the working voltage of the water pump and increase the pulse interval;

[0232] 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;

[0233] 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 water inlet of the machine is normal and heating is resumed.

[0234] Figure 5 This is a flow chart of constant water flow control, refer to Figure 9 In this embodiment, constant water flow control is achieved based on the water flow rate monitored by the flow meter. Constant water flow refers to a water supply method that maintains a constant water pressure by adjusting the operating state of the water pump under given water source conditions. This constant water flow control ensures stable water pressure, regardless of factors such as the length and height of the water supply pipe and the number of users.

[0235] Example 5

[0236] It should be noted that the method also includes:

[0237] When the outlet water temperature is higher than the high temperature alarm threshold for a continuous fifth set period of time, a high temperature alarm is issued;

[0238] Acquire water pump voltage slope data, and when the water pump voltage slope exceeds a water pump alarm threshold within a sixth preset time period, issue a water pump alarm;

[0239] When the flow meter loses the pulse signal for more than the seventh preset time, a water shortage alarm is issued;

[0240] Obtain water level data in the water tank. When the water level in the water tank is lower than the water level threshold, a water shortage alarm is issued and the water output of the water pump is adjusted;

[0241] The water level data in the instantaneous heater is obtained before the heater is started, and a water shortage alarm is issued when the water level in the instantaneous heater is lower than the water level threshold.

[0242] In this embodiment, a variety of water shortage alarm modes are provided to prevent the instant heater from burning dry.

[0243] In actual practice, the fifth setting time of the high temperature alarm is 1s, and the high temperature alarm threshold is set to 100°C. For example, after the outlet temperature of the instant heater remains at 101°C for 1s, a high temperature alarm is issued.

[0244] In practice, the fifth setting duration of the water pump alarm is 100ms, and the water pump alarm threshold is 500. For example, if the water pump voltage slope exceeds 500 (10-bit PWM) within 100ms, the water pump alarm will be triggered.

[0245] In specific practice, the seventh preset time length is 2s. When the flow meter loses the pulse signal for more than 2s, a water shortage alarm is issued.

[0246] In specific practice, the eighth preset time length is 1s. After the water shortage alarm is issued, the heating pipe is controlled to stop heating. After maintaining for 1s, the water pump is controlled to stop working, and the gas in the empty pipe area is transferred to the top of the heating pipe to replenish water to the heating pipe.

[0247] When implementing this technical solution, the heating must be stopped before stopping the water pump, including the following situations:

[0248] The water pump operates normally: turn off the heating and then the water pump when 3 mL is left;

[0249] The water pump stops automatically: after stopping heating, check if there are still 8 pulses on the remaining flow meter before turning off the water pump;

[0250] The water pump stops when it is short of water: turn off the heating first, and then run the water pump for 1 second before stopping.

[0251] It should be noted that after the water shortage alarm is issued, the method further includes:

[0252] 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.

[0253] This technical solution not only includes the above-mentioned anti-dry burning warning method, but also includes subsequent processing methods, specifically, Figure 6 As shown, in this technical solution, 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.

[0254] Example 6

[0255] It should be noted that the method also includes:

[0256] Record the steady-state power required to reach the set water temperature when the instantaneous heater was working last time;

[0257] After receiving the current water output instruction 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;

[0258] 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.

[0259] It is understandable that in this embodiment, by recording the steady-state power required to reach the set water temperature when the instant heater was working last time, the steady-state power recorded last time can be directly called during the current 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 last set water temperature to obtain the current required steady-state power. Figure 11 As shown, Figure 11 The first heating stage needs to calculate the steady-state power, while the second heating stage can directly call the steady-state power recorded in the first heating stage. Figure 7 It can be seen that the time required for the second stage heating to reach the set temperature is significantly shorter than that of the first stage heating.

[0260] Example 7

[0261] A high power heat pipe temperature control system, refer to Figure 8 ,include:

[0262] Water storage tank, water pump inlet pipe, flow meter, flow meter inlet pipe, reversing valve, reversing valve inlet pipe, plate connector, 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;

[0263] That is, the first temperature sensor is built into the water inlet pipe of the heat pipe;

[0264] That is, the heat pipe outlet pipe has a built-in second temperature sensor;

[0265] The reversing valve is connected to the water tank via the reversing valve water inlet pipe; and is also connected to the flow meter via the flow meter water inlet pipe;

[0266] The water pump is connected to the flow meter through the water pump inlet pipe; it is also connected to the heating pipe through the heating pipe inlet pipe;

[0267] The one-way valve is connected to the heating pipe through the heating pipe inlet pipe; it is also connected to the transition water tank through the transition water tank inlet pipe;

[0268] The transition water tank is connected to the stainless steel outlet pipe through the transition water tank outlet pipe to discharge water;

[0269] 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 a bulkhead joint;

[0270] The MCU is electrically connected to the flow meter, the water pump, the first temperature sensor, the second temperature sensor and the heat pipe;

[0271] The MCU is used to execute the high-power heat pipe control method in any of the above embodiments.

[0272] It should be noted that in this embodiment, by building a first temperature sensor into the water inlet of the heating pipe, the water temperature at the water inlet of the heating pipe can be obtained; by building a second temperature sensor into the water outlet of the heating pipe, the water temperature at the water outlet of the heating pipe can be obtained.

[0273] In this embodiment, the water inlet flow of the water tank, tap water source or pressure-stabilized water source can be obtained by connecting a flow meter to the water inlet pipe of the water pump.

[0274] In process control, the PID controller (also known as a PID regulator), which controls based on the proportional (P), integral (I), and differential (D) deviation of a process, is the most widely used automatic controller. It boasts a simple principle, ease of implementation, wide applicability, and independent control parameters, making parameter selection relatively simple. A characteristic of closed-loop control systems implemented by PID controllers is that the output of the controlled object (the controlled variable) is fed back to influence the controller's output, forming one or more closed loops.

[0275] Reference Figure 9-10 ,Two PID closed loops are constructed in this technical solution.,One is that the MCU adjusts the working voltage of the water pump ,according to the water flow rate monitored by the flow meter and ,the set water flow rate, to realize automatic adjustment of the ,water inlet flow and ensure the stability of the water inlet.

[0276] Secondly, the MCU adjusts the heating power of the instantaneous heat pipe in a closed loop according to the water temperature monitored by the first temperature sensor and the second temperature sensor, as well as the set water temperature. By monitoring the inlet and outlet water temperatures, the power of the instantaneous heat pipe is automatically controlled, 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 ensure that the outlet water temperature meets the requirements.

[0277] It should be noted that CCK water pipes are high-quality pipes produced using HDPE as raw material and are a type of advanced PE pipe.

[0278] Reference Figure 11, the system further includes:

[0279] A first Y capacitor CY1, a second Y capacitor CY2, a first inductor L1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a rectifier bridge BD1, an optocoupler OP1 and a first capacitor C1;

[0280] The first Y capacitor CY1, the second Y capacitor CY2 and the first inductor L1 form a common mode filter circuit connected to the mains;

[0281] 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;

[0282] 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;

[0283] Rectifier bridge BD1 is connected to the input end of optocoupler OP1;

[0284] The first interface of the output end of the optocoupler OP1 is connected to the MCU via the first capacitor C1 ; the second interface of the output end of the optocoupler is connected to the fifth resistor.

[0285] Preferably, a first switch TP1 is provided between the first interface of the output end of the optical coupler OP1 and the MCU.

[0286] Figure 11 The SCR_INT in the figure is the connection interface between the optocoupler OP1 and the MCU.

[0287] 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 interference signals in the power grid; Figure 4 CN3 is connected to the live line of the mains, and CN4 is connected to the neutral line of the mains. 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 (the total series resistance is 204K) used for current limiting. The subsequent rectifier bridge BD1 and the optocoupler OP1 can ensure that the fifth resistor R5 acts as a pull-up resistor for the optocoupler OP1 and outputs the maximum voltage of the valid zero-crossing signal within the full voltage range.

[0288] After being rectified by the rectifier bridge, the voltage signal with a frequency of 50Hz or 60Hz will output a positive frequency-doubled zero-crossing pulse signal of 100Hz or 120Hz. This increases the number of power pulses detected and controlled by the MCU by 1 times, and the temperature control accuracy is simultaneously increased by 1 times, so that the first capacitor C1 can effectively filter the zero-crossing signal.

[0289] In specific practice, software filtering is also performed: the digital filter detection frequency limit is based on the bandpass filter characteristics and the effective frequency limit is: 0.732*50Hz~1.367*60Hz, 36.6Hz~82Hz.

[0290] In this embodiment, more effective filtering is performed by combining software and hardware.

[0291] Reference Figure 12 , the system further includes:

[0292] a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a bidirectional thyristor Q1, a photoelectric isolation thyristor OP2, a transistor Q2, and an overheat protection relay F1;

[0293] The first end of the bidirectional thyristor Q1 is connected to the mains power after being filtered by the common mode filter circuit;

[0294] The second end of the bidirectional thyristor Q1 is connected to the heat pipe through the overheat protection relay F1;

[0295] The eighth resistor R8 and the ninth resistor R9 are connected in parallel;

[0296] The tenth resistor R10 and the eleventh resistor R11 are connected in parallel;

[0297] The third end of the bidirectional thyristor Q1 is connected to the first end of the photoelectric isolation thyristor OP2 through the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, and the eleventh resistor R11;

[0298] The second end of the photoelectric isolation thyristor OP2 is connected to the mains power after being filtered by the common mode filter circuit;

[0299] The third terminal of the photoelectric isolation thyristor OP2 is connected to the 5V power supply through the fourteenth resistor;

[0300] The fourth terminal of the photoelectric isolation thyristor OP2 is connected to the collector of the transistor;

[0301] The base of the transistor Q2 is connected to the MCU via a twelfth resistor R12 and is also grounded via a thirteenth resistor R13;

[0302] The emitter of transistor Q2 is grounded;

[0303] 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 and second ends of the bidirectional thyristor Q1; wherein the sixth resistor R6 and the seventh resistor R7 are connected in parallel; the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are connected in parallel.

[0304] Reference Figure 11 and Figure 12 In HOT_L and HOT_N, the first end of the bidirectional thyristor Q1 is connected to the AC power after being filtered by the common mode filter circuit.

[0305] Preferably, a second switch TP2 is provided between the base of the transistor Q2 and the MCU.

[0306] Figure 12 The SCR_Ctrl in the figure is the connection interface between transistor Q2 and MCU.

[0307] When bidirectional thyristor Q1 passes through the zero point of opto-isolated thyristor OP2, it triggers the opto-isolated thyristor OP2 to drive the output to control the high-power load, namely 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 the RC absorption circuit of bidirectional thyristor Q1. The eighth resistor R8, the ninth resistor R9, the tenth resistor R10, and the eleventh resistor R11 serve as current-limiting resistors to trigger the opto-isolated thyristor OP2 and the bidirectional thyristor Q1. In the event of an overload or short circuit in the heat pipe, overheat protection relay F1 provides protection. The MCU power control signal SCR1_Ctrl controls transistor Q2 through the twelfth resistor R12 for current limiting, driving the opto-isolated thyristor OP2 to complete the small-signal AC signal control function.

[0308] After the current is limited by the twelfth resistor R12, the thirteenth resistor R13 plays a steady-state fixed role to control the transistor Q2 to drive the optoelectronic isolation thyristor OP2 to complete the zero-crossing triggering of the bidirectional thyristor Q1 to turn on, thereby realizing the small signal control AC high-power signal power output control function.

[0309] Reference Figure 9 , MCU is connected to the host computer through wired communication;

[0310] The MCU is connected to the user terminal via wireless communication;

[0311] The MCU is equipped with a control panel;

[0312] The control panel is equipped with a reversing button for controlling the reversing valve;

[0313] The reversing valve is also connected to a pressure-stabilized water source. When it receives a reversing instruction from a host computer, a user terminal or a reversing button, it switches the water supply mode between a water tank, a tap water source and a pressure-stabilized water source.

[0314] In this technical solution, the reversing valve has three water inlet options: a water tank, tap water source, and a pressure-regulated water source. The reversing valve switches between these three water inlet options by receiving reversing commands from a host computer, a user terminal, or a reversing button. This technical solution ensures virtually uninterrupted water supply through these three water inlet options.

[0315] It should be noted that when there is no pressure-stabilized water source, it is generally necessary to balance the pressure of the tap water source before using the tap water source as the water inlet source.

[0316] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0317] It should be noted that, in the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0318] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0319] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having logic gate circuits for implementing logic functions on data signals, an application-specific integrated circuit having suitable combinational logic gate circuits, a programmable gate array (PGA), a field-programmable gate array (FPGA), etc.

[0320] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related 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 embodiment.

[0321] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0322] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0323] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0324] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify 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 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 heat pipe to preheat based on the preheating power; Determine the inlet and outlet water temperature difference based on the outlet water temperature and 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 heating pipe maintains steady-state power heating for a first set time, it switches to closed-loop heating; The method further comprises: If the outlet water temperature is greater than the set water temperature, determining whether the required cooling range exceeds a preset cooling threshold; If the required cooling range exceeds the preset cooling threshold, the power output of the instantaneous heater is shut down. After the outlet water temperature reaches the preset outlet water condition through drainage cooling, the instantaneous heater is heated according to the steady-state power control. If the required cooling range does not exceed the preset cooling threshold, the cooling and heating power is calculated, and the heat pipe is heated according to the cooling and 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; The closed-loop heating comprises: Determine the change in 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, heating is performed 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 has not reached the third set time, heating is performed 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 reaches the third set time, the closed-loop heating is terminated; When the steady-state power control, that is, the heat pipe performs heating for a fourth set time, the closed-loop heating is terminated.

2. 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 based on 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 instantaneous 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 entries 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 instantaneous 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 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 until the end.

3. 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 instantaneous heater is 0, or the current power of the instantaneous 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 is not 0, determine whether the power output half cycle exceeds the AC frequency; If the power output half cycle number exceeds the AC frequency, the heater will be controlled to heat according to the power corresponding to the rated AC frequency; If the current power of the instantaneous heater is not 0 and does not exceed the power corresponding to the rated AC frequency, the required power output wave number is determined according to the rated AC frequency; Determine power array data; Obtaining a heating control pulse array according to 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 frequency; If the control end condition is not met, each time an interrupt 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 a control end condition is reached.

4. The method according to claim 1, wherein The method further comprises: Monitor the water flow at the water inlet of the heat pipe; Calculate the target control pulse width based on 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 operating 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 operating 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 water inlet of the machine is normal and heating is resumed.

5. The method according to claim 4, 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.

6. The method according to claim 4, characterized in that The method further comprises: When the outlet water temperature is higher than the high temperature alarm threshold 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 a 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 water level data in the water tank. When the water level in the water tank is lower than the water level threshold, a water shortage alarm is issued and the water output of the water pump is adjusted; The water level data in the instantaneous heater is obtained before the heater is started, and a water shortage alarm is issued when the water level in the instantaneous heater is lower than the water level threshold.

7. The method according to claim 6, characterized in that After the water shortage alarm is issued, the method further includes: 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.

8. 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 output instruction 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.

9. 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 connector, 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 built with a first temperature sensor; The water outlet pipe of the heating pipe is built with a second temperature sensor; The reversing valve is connected to the water 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 inlet pipe; and is also connected to the instant heating pipe via the instant heating pipe 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 outlet pipe to discharge water; One end of the CCK tube 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 plate connector; 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 according to any one of claims 1 to 8.

10. The high-power heat pipe temperature control system according to claim 9, 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 optocoupler; The first interface of the optocoupler output end is connected to the MCU via the first capacitor; the second interface of the optocoupler output end is connected to the fifth resistor.

11. The high-power heat pipe temperature control system according to claim 10, 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 transistor, 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 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 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 terminal 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 via the twelfth resistor and is also grounded via 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.

12. The high-power heat pipe temperature control system according to claim 9, 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 equipped 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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