Electric water heater with intelligent heating control system and intelligent heating control method

Abstract

The electric water heater with the intelligent heating control system comprises an inner container, a water inlet pipe, a water outlet pipe and the intelligent heating control system, the water inlet pipe and the water outlet pipe are communicated with the inner container, the intelligent heating control system comprises a controller, a detection unit and an execution unit, the execution unit comprises a heating pipe, the heating pipe extends into the inner container, and the controller controls the heating pipe. The detection unit further comprises a flow sensor arranged on the water inlet pipe, a first water pressure sensor and a first water temperature sensor which are arranged in the inner container, and a second water pressure sensor and a second water temperature sensor which are arranged on the water outlet pipe. And the controller controls whether the heating pipe performs heating work or not through at least one of a received flow signal L, a received water pressure signal P1, a received water temperature signal T1, a received water pressure signal P2 and a received water temperature signal T2 of the flow sensor. The method has the advantages that data detection and extraction are simple, judgment logic is simple and clear, complex numerical value comparison is not needed, an intelligent control system is low in cost, and a control mechanism is comprehensive and perfect.

Description

Technical Field

[0001] The present invention relates to the field of electric water heater heating control, and particularly to an electric water heater with an intelligent heating control system and an intelligent heating control method. Background Art

[0002] Nowadays, electric water heaters have become essential household electrical appliances in people's daily lives. However, during actual use, electric water heaters may suddenly malfunction, such as water shortage and dry burning, inner tank leakage, and failure of the safety valve's anti-backflow function, resulting in the heating tube being unsuitable for continued heating and affecting the supply of hot water to users. In view of the foregoing situation, there is currently no very perfect intelligent detection and judgment mechanism to achieve intelligent control of the heating tube and timely warn users to prevent danger. Therefore, it is difficult to prevent problems before they occur and it is easy to cause serious property or personal injuries.

[0003] In response to the above problems, some manufacturers have tried to develop electric water heaters with intelligent heating control systems. For example, a Chinese invention application with the publication number CN113669901A and the title "A Water Heater with Cloud Processing Based on Pressure Difference" discloses that: the water heater includes an electric heating device and a water tank. The electric heating device is arranged in the water tank. The water tank includes a water inlet pipe and a hot water outlet. The electric heating device includes a first pipe box, a second pipe box and a coil pipe. The coil pipe is connected to the first pipe box and the second pipe box to form a closed circulation of heating fluid. An electric heater is arranged in the first pipe box; the coil pipe is one or more, and each coil pipe includes multiple arc-shaped tube bundles. The center lines of the multiple arc-shaped tube bundles are arcs with the first pipe box as the concentric circle. The ends of adjacent tube bundles are connected, so that the ends of the tube bundles form free ends of the tube bundles; a first electric heater and a second electric heater are respectively arranged in the first pipe box and the second pipe box; a phase change fluid is filled in the first pipe box and / or the second pipe box. A first pressure sensor and a second pressure sensor are respectively arranged in the first pipe box and the second pipe box to detect the pressures in the first pipe box and the second pipe box. The first pressure sensor and the second pressure sensor are connected to the controller for data connection. The controller extracts the pressure data measured by the first pressure sensor or the second pressure sensor according to the time sequence, and obtains the pressure difference or the cumulative change of the pressure difference through the comparison of the pressure data in adjacent time periods. The controller is connected to a cloud server, and the cloud server is connected to a client. The controller transmits the cumulative data of the pressure difference or the change of the pressure difference to the cloud server, and then transmits it to the client through the cloud server. The client is a mobile phone, and an APP program is installed on the mobile phone. Users can select the working mode of automatic control or manual control on the client. The controller controls the heating according to the working mode selected by the control client. In the working mode of automatic control, when the first electric heater is heating and the second electric heater is not heating, for the pressure detected by the first pressure sensing element, if the pressure in the previous time period is P1 and the pressure in the adjacent subsequent time period is P2, and if P1 < P2 and the value of P2 - P1 is lower than the threshold, the controller controls the first electric heater to stop heating and the second electric heater to start heating; when the second electric heater is heating and the first electric heater is not heating, for the pressure detected by the second pressure sensing element, if the pressure in the previous time period is P1 and the pressure in the adjacent subsequent time period is P2, and if P1 < P2 and the value of P2 - P1 is lower than the threshold, the controller controls the second electric heater to stop heating and the first electric heater to start heating. The technical solution described in this invention application needs to compare the pressure difference (P2 - P1) with the threshold to control whether the electric heater heats. This solution requires not only detecting the pressure change but also determining the relationship between the pressure difference and the threshold, and the determination logic is slightly complicated. Moreover, the technical problem to be solved by this solution is to change the heating component through pressure detection to make the electric heater perform alternating heating, thereby increasing the heating effect and the descaling effect.Therefore, it is impossible to truly address the problem that the heating element continues to heat when there is a fault in the electric water heater.

[0004] For another example, a Chinese invention application with the application publication number CN106247626A and titled "An Electric Water Heater for Leak Detection" discloses that: the electric water heater includes a controller, an electric heating device, and a water tank. The electric heating device is arranged in the water tank. The electric heater includes a left tube box, a right tube box, and a heat exchange tube connecting the left tube box and the right tube box. An electric heater is arranged in the left tube box and / or the right tube box. The heat exchange tube, the left tube box, and the right tube box form a closed circulation of the heating fluid. The electric heating device is also provided with a pressure sensor for detecting the pressure inside the electric heating device. The electric heating device and the pressure sensor are connected to the controller for data connection. The controller automatically controls the operation of the electric water heater according to the detected pressure. The controller is connected to a cloud server, and the cloud server is connected to a water heater client. The controller transmits the measured pressure data to the cloud server and then to the client through the cloud server. The client is a mobile phone, and the mobile phone installs an APP program. Users can obtain the pressure data through the client. When the measured pressure is lower than the first pressure, the controller controls the heating power of the electric heating device to be reduced to the first power for heating. When the measured pressure is lower than the second pressure which is lower than the first pressure, the controller controls the heating power of the electric heating device to be reduced to the second power which is lower than the first power for heating. When the measured pressure is lower than the third pressure which is lower than the second pressure, the controller controls the heating power of the electric heating device to be reduced to the third power which is lower than the second power for heating. When the measured pressure is lower than the fourth pressure which is lower than the third pressure, the controller controls the heating power of the electric heating device to be reduced to the fourth power which is lower than the third power for heating. When the measured pressure is lower than the fifth pressure which is lower than the fourth pressure, the controller stops the heating of the electric heating device. The technical solution of this invention application focuses on how to achieve automatic power control to improve heating efficiency and heating uniformity, but still cannot provide a solution for heating control under multiple faults.For another example, a Chinese invention application with the application publication number CN106016710A and titled "Electric Water Heater for Overheat Detection" discloses that: the electric water heater includes a controller, an electric heating device, and a water tank. The electric heating device is arranged in the water tank. The electric heater includes a left tube box, a right tube box, and a heat exchange tube connecting the left tube box and the right tube box. An electric heater is arranged in the left tube box and / or the right tube box. The heat exchange tube, the left tube box, and the right tube box form a closed circulation of the heating fluid. The electric heating device is further provided with a pressure sensor for detecting the pressure inside the electric heating device. The electric heating device and the pressure sensor are connected to the controller for data transmission. The controller determines whether the heating power is too high based on the detected pressure, thereby automatically controlling the operation of the electric water heater. The controller is connected to a cloud server, and the cloud server is connected to a water heater client. The controller transmits the measured pressure data to the cloud server, and then it is transmitted to the client through the cloud server. The client is a mobile phone, and an APP program is installed on the mobile phone. Users can obtain the pressure data through the client. It further includes a water inlet pipe and a water outlet pipe. An inlet valve and an outlet valve are respectively arranged on the water inlet pipe and the water outlet pipe. The valves are connected to the controller for data transmission. If the detected pressure is higher than a certain pressure, the controller automatically increases the opening degrees of the inlet valve and the outlet valve, and transmits the information about increasing the inlet valve and the outlet valve to the client through the cloud server. When the measured pressure is higher than a first pressure, the controller controls the heating power of the electric heating device to be reduced to a first power for heating. When the measured pressure is higher than a second pressure which is higher than the first pressure, the controller controls the heating power of the electric heating device to be reduced to a second power which is lower than the first power for heating. When the measured pressure is higher than a third pressure which is higher than the second pressure, the controller controls the heating power of the electric heating device to be reduced to a third power which is lower than the second power for heating. When the measured pressure is higher than a fourth pressure which is higher than the third pressure, the controller controls the heating power of the electric heating device to be reduced to a fourth power which is higher than the third power for heating. When the measured pressure is higher than a fifth pressure which is higher than the fourth pressure, the controller stops the heating of the electric heating device. For the technical solution of this invention application, the focus is still on how to achieve automatic power control to improve heating efficiency and heating uniformity, and it still cannot provide a solution for heating control under multiple faults.

[0005] Finally, Chinese Invention Application with the publication number CN110425745A and titled "A Method for Water Heater" discloses that: a pressure sensor is provided in the water inlet pipe outside the water heater body, and the pressure sensor is used to detect the water pressure. The method includes: obtaining a pressure value indicating the water pressure; determining a frequency value associated with the pressure value according to the pressure value; and determining the water leakage state of the water heater according to the change trends of the pressure value and the frequency value. In the technical solution of this invention application, by obtaining the pressure value detected by the pressure sensor provided in the water inlet pipe outside the housing of the water heater, determining the frequency value associated with the pressure value according to the pressure value, and determining the water leakage state of the water heater according to the change trends of the pressure value and the frequency value. Although the technical solution of this invention application mentions "determining the water leakage amount according to the frequency value" and "controlling the water heater to stop heating when the water leakage amount is greater than a preset value", which partially discloses the heating control solution under water leakage failure, since the determination is made according to the "frequency value", the requirements for data detection and extraction are higher, the cost increases, and the intelligent control requirements under various failures are not fully solved in this solution. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides an electric water heater with an intelligent heating control system and an intelligent heating control method, which have simple data detection and extraction, simple and clear determination logic without complex numerical comparison, low cost of the intelligent control system, and comprehensive and perfect control mechanism.

[0007] The present invention application mainly adopts the following technical solutions:

[0008] An electric water heater with an intelligent heating control system includes an inner tank, a water inlet pipe, a water outlet pipe and an intelligent heating control system. The water inlet pipe and the water outlet pipe are respectively communicated with the inner tank. The intelligent heating control system includes a controller, a detection unit and an execution unit. The execution unit includes a heating pipe, and the heating pipe extends into the inner tank. The controller is connected to the heating pipe and controls the heating operation of the heating pipe. A safety valve is installed on the water inlet pipe. The detection module further includes a flow sensor installed on the water inlet pipe, a first water pressure sensor installed in the inner tank, a first water temperature sensor installed in the inner tank, a second water pressure sensor installed on the water outlet pipe, and a second water temperature sensor installed on the water outlet pipe. The controller controls whether the heating pipe performs heating operation through at least one of the flow signal L of the flow sensor, the water pressure signal P1 of the first water pressure sensor, the water temperature signal T1 of the first water temperature sensor, the water pressure signal P2 of the second water pressure sensor, and the water temperature signal T2 of the second water temperature sensor received.

[0009] Wherein, the intelligent heating control system further includes an alarm, and the alarm gives an alarm after receiving the alarm indication from the controller.

[0010] Wherein, the intelligent heating control system further includes a remote transmitter, and the remote transmitter sends an alarm message to the user after receiving the alarm indication from the controller, and / or the remote transmitter sends a working status message to the user after receiving the working status sending indication from the controller.

[0011] Wherein, the controller first controls the heating pipe to preheat for a period of time t, and within the preheating period t,

[0012] When the flow sensor does not detect a flow signal L, the water pressure signal P1 of the first water pressure sensor does not increase, the water temperature signal T1 of the first water temperature sensor does not increase, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, then the controller determines that the inner tank is short of water and dry burns and controls the heating pipe to stop heating; or,

[0013] When the flow sensor does not detect a flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, then the controller determines that the water volume in the inner tank is insufficient and controls the heating pipe to stop heating; or,

[0014] When the flow sensor does not detect a flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases, and the water temperature signal T2 of the second water temperature sensor increases, then the controller determines that the water volume in the inner tank is sufficient and controls the heating pipe to continue heating; or,

[0015] When the flow sensor does not detect a flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases and then decreases, and the water temperature signal T2 of the second water temperature sensor increases, then the controller determines that at least one of the inner tank leaks, hot water is discharged from the outlet pipe, or the safety valve leaks externally, and the controller controls the heating pipe to stop heating;

[0016] And,

[0017] The water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设When the safety valve leaks externally and the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal, 设 and does not decrease, the controller determines that the external leakage of the safety valve fails, and the controller controls the heating pipe to stop heating.

[0018] Among them, the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设 is equal to the external leakage pressure value of the safety valve.

[0019] Among them, the value of the preheating time period t is such that the change value of the water pressure signal P1 of the first water pressure sensor between the start and the end of the preheating time period t is not greater than the internal leakage pressure value of the safety valve.

[0020] Among them, when the flow sensor does not detect the flow signal L, the controller determines that the internal leakage of the safety valve fails or the cold water pressure is insufficient, or the controller determines that there is no reverse flow in the water inlet pipe.

[0021] Among them, the controller first controls the heating pipe to preheat for a period of time t. During the preheating time period t,

[0022] when the flow sensor detects the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that the inner tank is short of water and dry burning or the water volume in the inner tank is insufficient and controls the heating pipe to stop heating; or,

[0023] when the flow sensor detects the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, and the water pressure signal P2 of the second water pressure sensor increases, the controller determines that the water volume in the inner tank is sufficient and controls the heating pipe to continue heating; or,

[0024] When the flow sensor detects a flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, and the water pressure signal P2 of the second water pressure sensor increases and then decreases, the controller determines that at least one of the following has occurred: the inner tank has leaked, the anti-backflow function of the safety valve has failed, hot water is discharged from the outlet pipe, or the safety valve has external leakage. Moreover, when the decrease in the water pressure signal P1 of the first water pressure sensor occurs earlier than the decrease in the water pressure signal P2 of the second water pressure sensor, the controller determines that the inner tank has leaked, the anti-backflow function of the safety valve has failed, or the safety valve has external leakage, and controls the heating pipe to stop heating; or, when the decrease in the water pressure signal P1 of the first water pressure sensor occurs later than the decrease in the water pressure signal P2 of the second water pressure sensor, the controller determines that hot water is discharged from the outlet pipe and controls the heating pipe to continue heating;

[0025] and,

[0026] when the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设 the safety valve has external leakage. When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal 设 and then does not decrease, the controller determines that the external leakage of the safety valve has failed, and the controller controls the heating pipe to stop heating.

[0027] Wherein, the change value between the maximum value of the water pressure signal P1 of the first water pressure sensor and the end of the preheating period t is not greater than the internal leakage pressure value of the safety valve, and the value of the preheating period t is greater than the value that makes the change value between the maximum value of the water pressure signal P1 of the first water pressure sensor and the end of the preheating period t not greater than the internal leakage pressure value of the safety valve.

[0028] An intelligent heating control method, including an intelligent heating control system provided on an electric water heater. The electric water heater includes an inner tank, a water inlet pipe, and a water outlet pipe. The water inlet pipe and the water outlet pipe are respectively communicated with the inner tank. The intelligent heating control system includes a controller, a detection unit, and an execution unit. The execution unit includes a heating pipe which extends into the inner tank. The controller is connected to the heating pipe and controls the heating operation of the heating pipe. A safety valve is installed on the water inlet pipe. The detection unit further includes a flow sensor installed on the water inlet pipe, a first water pressure sensor installed in the inner tank, a first water temperature sensor installed in the inner tank, a second water pressure sensor installed on the water outlet pipe, and a second water temperature sensor installed on the water outlet pipe. The controller controls whether the heating pipe performs heating operation based on at least one of the flow signal L from the flow sensor, the water pressure signal P1 from the first water pressure sensor, the water temperature signal T1 from the first water temperature sensor, the water pressure signal P2 from the second water pressure sensor, and the water temperature signal T2 from the second water temperature sensor received.

[0029] The controller first controls the heating pipe to preheat for a period of time t. During the preheating period t,

[0030] When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor does not increase, the water temperature signal T1 of the first water temperature sensor does not increase, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, then the controller determines that the inner tank is short of water and dry burning occurs and controls the heating pipe to stop heating; or,

[0031] When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, then the controller determines that the water volume in the inner tank is insufficient and controls the heating pipe to stop heating; or,

[0032] When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases, and the water temperature signal T2 of the second water temperature sensor increases, then the controller determines that the water volume in the inner tank is sufficient and controls the heating pipe to continue heating; or,

[0033] When the flow sensor does not detect a flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases and then decreases, and the water temperature signal T2 of the second water temperature sensor increases, the controller determines that at least one of the following occurs: the inner tank leaks, hot water is discharged from the outlet pipe, or the safety valve leaks externally. The controller controls the heating pipe to stop heating;

[0034] And,

[0035] When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设 the safety valve leaks externally. When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal 设 and does not decrease, the controller determines that the external leakage of the safety valve fails, and the controller controls the heating pipe to stop heating;

[0036] Or,

[0037] When the flow sensor detects a flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that the inner tank is short of water and dry burns or the water volume in the inner tank is insufficient, and controls the heating pipe to stop heating; Or,

[0038] When the flow sensor detects a flow signal L, the water pressure signal P1 of the first water pressure sensor increases, and the water pressure signal P2 of the second water pressure sensor increases, the controller determines that the water volume in the inner tank is sufficient and controls the heating pipe to continue heating; Or,

[0039] When the flow sensor detects a flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, and the water pressure signal P2 of the second water pressure sensor increases and then decreases, the controller determines that at least one of the following occurs: the inner tank leaks, the anti-backflow function of the safety valve fails, hot water is discharged from the outlet pipe, or the safety valve leaks externally. And, when the decrease of the water pressure signal P1 of the first water pressure sensor is earlier than the decrease of the water pressure signal P2 of the second water pressure sensor, the controller determines that the inner tank leaks, the anti-backflow function of the safety valve fails, or the safety valve leaks externally, and controls the heating pipe to stop heating; Or, when the decrease of the water pressure signal P1 of the first water pressure sensor is later than the decrease of the water pressure signal P2 of the second water pressure sensor, the controller determines that hot water is discharged from the outlet pipe and controls the heating pipe to continue heating;

[0040] And,

[0041] when the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设 the safety valve leaks externally. When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal 设 and still does not decrease, the controller determines that the external leakage of the safety valve fails, and the controller controls the heating pipe to stop heating.

[0042] According to the technical solution of the present invention, the following beneficial effects are achieved: Only by the flow sensor installed on the water inlet pipe, the first water pressure sensor and the first water temperature sensor installed in the inner tank, the second water pressure sensor and the second water temperature sensor installed on the water outlet pipe, it is possible to complete the comprehensive determination of the water volume and other conditions in the inner tank and accordingly control whether the heating pipe performs heating work. The whole intelligent heating control system has few components and low manufacturing cost; only based on the combination of change trends and the early or late of changes, it can be determined whether the heating pipe is suitable for continuing to heat, and even without comparing the change difference with a specific value, the determination can be completed. The determination mechanism is simple and the logic is clear, and no complex operations are required, so the determination program of the controller responds quickly. Description of the Drawings

[0043] Figure 1 It is a frame diagram of each unit of the electric water heater.

[0044] Figure 2 It is a schematic structural diagram of an electric water heater with double tanks arranged up and down.

[0045] Figure 3 It is a schematic structural diagram of the combination of the ferrule and the integrated modular water temperature and water pressure sensor.

[0046] Figure 4 It is Figure 3 the longitudinal sectional structural diagram in

[0047] Figure 5 It is a simplified double determination logic block diagram.

[0048] 1 Inner tank, 2 Water inlet pipe, 3 Water outlet pipe, 30 Ferrule, 4 Heating pipe, 5 Safety valve. Detailed Embodiment

[0049] The following further elaborates on the technical solution of the present invention in conjunction with the drawings:

[0050] See Figures 1-5As shown, an electric water heater with an intelligent heating control system includes an inner tank 1, a water inlet pipe 2, a water outlet pipe 3, and an intelligent heating control system. The water inlet pipe 2 and the water outlet pipe 3 are respectively connected to the inner tank 1. The intelligent heating control system includes a controller, a detection unit, and an execution unit. The execution unit includes a heating pipe 4, and the heating pipe 4 extends into the inner tank 1. The controller is connected to the heating pipe 4 and controls the heating operation of the heating pipe 4. A safety valve 5 is installed on the water inlet pipe 2. The detection unit further includes a flow sensor installed on the water inlet pipe 2, a first water pressure sensor installed in the inner tank 1, a first water temperature sensor installed in the inner tank 1, a second water pressure sensor installed on the water outlet pipe 3, and a second water temperature sensor installed on the water outlet pipe 3. The controller controls whether the heating pipe 4 performs heating operation based on at least one of the flow signal L from the flow sensor, the water pressure signal P1 from the first water pressure sensor, the water temperature signal T1 from the first water temperature sensor, the water pressure signal P2 from the second water pressure sensor, and the water temperature signal T2 from the second water temperature sensor. Preferably, the first water pressure sensor and the first water temperature sensor in the inner tank 1 can adopt an integrated modular water temperature and water pressure sensor product and be installed at the bottom of the inner tank 1 cavity. In some specific cases, for example, when the electric water heater adopts a double-tank arrangement with upper and lower tanks, the first water pressure sensor and the first water temperature sensor can be installed at the bottom of the inner tank 1 cavity of the lower tank; for another example, when the electric water heater adopts a double-tank arrangement with left and right tanks, the first water pressure sensor and the first water temperature sensor can be installed at the bottom of the inner tank 1 cavity where the water inlet pipe 2 is located. Preferably, the second water pressure sensor and the second water temperature sensor on the water outlet pipe 3 can also adopt an integrated modular water temperature and water pressure sensor product. This water temperature and water pressure sensor product is installed through the positioning card slot on the ferrule 30 connected to the water outlet pipe 3 to detect the water pressure and water temperature in the water outlet pipe 3, and a sealing ring is used for waterproof sealing during installation. More preferably, the water outlet pipe 3 is connected to multiple water-using terminals through the ferrule 30. In this application, only by the flow sensor installed on the water inlet pipe, the first water pressure sensor and the first water temperature sensor installed in the inner tank, the second water pressure sensor and the second water temperature sensor installed on the water outlet pipe, it is possible to complete the determination of the water volume and other conditions in the inner tank and accordingly control whether the heating pipe performs heating operation. The whole set of intelligent heating control system has few components and low manufacturing cost. In this application, the controller processes and analyzes the electrical signals fed back by each sensor (including the conversion of electrical signals). The above-mentioned flow signal L, water pressure signals P1 and P2, and water temperature signals T1 and T2 refer to the numerical signals that can be recognized by users after being converted by the controller.

[0051] See Figure 1As shown, the intelligent heating control system further includes an alarm, which alarms after receiving the alarm indication from the controller. In this application, when the controller determines that the heating tube cannot continue to heat, the controller sends an alarm indication to the alarm, and the alarm starts to alarm to prompt the user that the current state is abnormal and needs to be dealt with in time to prevent danger. Preferably, the alarm includes at least one of a buzzer, an indicator light, and a display screen (such as popping up a warning message on the display screen).

[0052] See Figure 1 As shown, the intelligent heating control system further includes a remote transmitter, which sends an alarm message to the user after receiving the alarm indication from the controller, and / or the remote transmitter sends a working status message to the user after receiving the working status sending indication from the controller. In this application, after receiving the alarm indication and / or the working status sending indication from the controller, the remote transmitter sends a request to the remote transfer station to send an alarm message or a working status message to the user through the remote transfer station. In this application, the remote transmitter can not only send alarm messages to the user, but also send working status messages to the user according to the user's request (the user sends a request to the remote transfer station through the mobile terminal, the remote transfer station then sends the request to the controller, and then the controller sends the working status message to the user's mobile terminal through the remote transmitter via the remote transfer station). In addition to passively receiving alarm messages, the user can also actively request to view the working status.

[0053] See Figure 5 As shown, the controller first controls the heating tube 4 to preheat for a period of time t. During the preheating period t,

[0054] when the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor does not increase, the water temperature signal T1 of the first water temperature sensor does not increase, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that the inner tank 1 is short of water and dry burns and controls the heating tube 4 to stop heating; or,

[0055] when the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that the water volume in the inner tank 1 is insufficient and controls the heating tube 4 to stop heating; or,

[0056] when the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases, and the water temperature signal T2 of the second water temperature sensor increases, the controller determines that the water volume in the inner tank 1 is sufficient and controls the heating tube 4 to continue heating; or,

[0057] When the flow sensor does not detect a flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases and then decreases, and the water temperature signal T2 of the second water temperature sensor increases, the controller determines that at least one of the following occurs: the inner tank 1 leaks, hot water is discharged from the water outlet pipe 3, or the safety valve 5 leaks externally. The controller controls the heating pipe 4 to stop heating;

[0058] And,

[0059] The water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设 When the safety valve 5 leaks externally, and when the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal 设 and still does not decrease, the controller determines that the external leakage of the safety valve 5 fails, and the controller controls the heating pipe 4 to stop heating.

[0060] In this application, if the flow sensor does not detect a flow signal, the controller determines that there is no water inlet or backflow in the water inlet pipe. During the preheating time period t, the controller determines whether to continue heating based on the signals or signal combinations feedback by at least one of the first water pressure sensor, the first water temperature sensor, the second water pressure sensor, and the second water temperature sensor. When the flow sensor does not detect a flow signal, the heating of the heating pipe becomes the only factor that may affect the changes in water pressure and water temperature at the inner tank and the water outlet pipe. Specifically, when the heating pipe is heating, but the water pressure P1 in the inner tank does not increase, the water temperature T1 in the inner tank does not increase, the water pressure P2 at the water outlet pipe does not change, and the water temperature T2 at the water outlet pipe does not change (since the water pressure signal and water temperature signal cannot be displayed at the water outlet pipe, it is represented by "no change"), it indicates that the heating pipe is not immersed below the water surface in the inner tank. Therefore, the controller determines that the inner tank is short of water and dry burning occurs. When the heating pipe is heating, but the water pressure P1 in the inner tank increases, the water temperature T1 in the inner tank increases, the water pressure P2 at the water outlet pipe does not change, and the water temperature T2 at the water outlet pipe does not change (since the water pressure signal and water temperature signal cannot be displayed at the water outlet pipe, it is represented by "no change"), it indicates that the heating pipe is immersed below the water surface in the inner tank, but due to insufficient water volume, the changes in water pressure and water temperature at the water outlet pipe cannot be induced. When the heating pipe is heating, but the water pressure P1 in the inner tank increases, the water temperature T1 in the inner tank increases, the water pressure P2 at the water outlet pipe increases, and the water temperature T2 at the water outlet pipe increases, it indicates that the water volume in the inner tank is sufficient (and according to the upward change trend of all signals, it also indicates that there is no leakage). When the heating pipe is heating, but the water pressure P1 in the inner tank increases and then decreases, the water temperature T1 in the inner tank increases, the water pressure P2 at the water outlet pipe increases and then decreases, and the water temperature T2 at the water outlet pipe increases, it indicates that the water volume in the inner tank is sufficient, but due to pressure relief in the inner tank and / or the water outlet pipe, the water pressure increases and then decreases. Therefore, it is determined that the inner tank leaks, hot water is discharged from the water outlet pipe (since the water inlet pipe does not supply water and it is not suitable to continue heating), the safety valve leaks externally, etc., and it is not suitable to continue heating. In this application, when the water pressure P1 in the inner tank exceeds the preset value P1 设 the safety valve starts to leak externally. If the water pressure P1 in the inner tank exceeds the preset value P1 设 and still does not decrease, the external leakage of the safety valve fails, and it is also not suitable to continue heating.

[0061] Furthermore, the controller sets the preset value P1 of the water pressure signal of the first water pressure sensor 设 equal to the external leakage pressure value of the safety valve 5. Preferably, the external leakage pressure value of the safety valve 5 is 0.75 Mpa to 0.85 Mpa.

[0062] Further, the value of the preheating time period t is such that the change in the water pressure signal P1 of the first water pressure sensor between the start and the end of the preheating time period t is not greater than the internal leakage pressure value of the safety valve 5. In this application, when there is no water inlet and no backflow in the water inlet pipe, heating the heating pipe becomes the only factor that may affect the water pressure and water temperature changes at the inner tank and the water outlet pipe. To ensure that the change in the water pressure P1 in the inner tank does not affect whether cold water can be pressed into the inner tank, that is, to exclude the situation where cold water cannot be pressed in due to the change in the water pressure P1 in the inner tank caused solely by heating, therefore, the preheating time period t is set such that the change in the water pressure P1 in the inner tank (from the start to the end of the preheating time period t) is not greater than the internal leakage pressure value of the safety valve. Preferably, the internal leakage pressure value of the safety valve is between 0.08 MPa and 0.2 MPa. In this application, limiting the preheating time period t can also further prevent excessive water vapor from being generated due to the heating of the heating pipe, thereby preventing the water pressure and water temperature at the water outlet pipe from being affected by this interference factor. According to experience, for every 20 °C increase in the water temperature in the inner tank, the water pressure will increase by about 0.005 MPa. To avoid as much as possible the water vapor generated by heating from affecting the water pressure and water temperature at the water outlet pipe, the preheating time period t should not cause the water temperature in the inner tank to rise by more than 5 °C.

[0063] Further, when the flow sensor does not detect the flow signal L, the controller determines that the safety valve 5 has an internal leakage failure or the cold water pressure is insufficient, or the controller determines that there is no backflow in the water inlet pipe 2. In this application, the feedback signal of only the flow sensor cannot enable the controller to control the heating pipe to "continue heating" or "stop heating". It is necessary to further combine the water pressure and water temperature signals in the inner tank and / or at the water outlet pipe, that is, to adopt a dual determination method that combines the feedback of the flow sensor at the water inlet pipe with the feedback of the water pressure and water temperature sensors in the inner tank and / or at the water outlet pipe, so as to make the determination result more accurate and the logic more rigorous.

[0064] Or, as shown in Figure 5 shown, the controller first controls the heating pipe 4 to preheat for a period of time t. During the preheating time period t,

[0065] when the flow sensor detects the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that the inner tank 1 is short of water and dry burning or the water volume in the inner tank 1 is insufficient and controls the heating pipe 4 to stop heating; or,

[0066] when the flow sensor detects the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, and the water pressure signal P2 of the second water pressure sensor increases, the controller determines that the water volume in the inner tank 1 is sufficient and controls the heating pipe 4 to continue heating; or,

[0067] When the flow sensor detects a flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, and the water pressure signal P2 of the second water pressure sensor increases and then decreases, the controller determines that at least one of the following has occurred: the inner tank 1 is leaking, the anti-backflow function of the safety valve 5 has failed, hot water is discharged from the outlet pipe 3, or the safety valve 5 is leaking externally. Moreover, when the decrease in the water pressure signal P1 of the first water pressure sensor occurs earlier than the decrease in the water pressure signal P2 of the second water pressure sensor, the controller determines that the inner tank 1 is leaking, the anti-backflow function of the safety valve 5 has failed, or the safety valve 5 is leaking externally, and controls the heating pipe 4 to stop heating; or, when the decrease in the water pressure signal P1 of the first water pressure sensor occurs later than the decrease in the water pressure signal P2 of the second water pressure sensor, the controller determines that hot water is being discharged from the outlet pipe 3 and controls the heating pipe 4 to continue heating;

[0068] and,

[0069] When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设 the safety valve 5 leaks externally. When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal 设 and still does not decrease, the controller determines that the external leakage of the safety valve 5 has failed, and the controller controls the heating pipe 4 to stop heating.

[0070] In this application, when the flow sensor detects a flow signal, the controller determines that there is water inlet at the water inlet pipe or reverse flow of the safety valve (similarly, a dual determination method is combined with the feedback of the water pressure and water temperature sensors in the inner tank and / or at the water outlet pipe). During the preheating time period t, the controller determines whether to continue heating based on the signal or signal combination feedback by at least one of the first water pressure sensor, the first water temperature sensor, the second water pressure sensor, and the second water temperature sensor. When the flow sensor detects a flow signal, the heating pipe starts to heat, which may cause changes in the water pressure and water temperature at the inner tank and the water outlet pipe. Among them, it is necessary to further elaborate on the water temperature, because it will be impacted by the cold water replenished and cannot be truly reflected (the reverse flow of the safety valve has a great impact on the water pressure and little impact on the water temperature). Therefore, in some cases, the feedback signal of the water temperature sensor is not an important basis for determination. Therefore, based on the above situation, when the heating pipe is heating, if the water pressure P1 in the inner tank increases, the water pressure P2 at the water outlet pipe remains unchanged, and the water temperature T2 at the water outlet pipe remains unchanged (since no water pressure signal and water temperature signal can be displayed at the water outlet pipe, it is represented by "remains unchanged"), it indicates that the inner tank is short of water and dry burning or the water volume is insufficient; when the heating pipe is heating, if the water pressure P1 in the inner tank increases and the water pressure P2 at the water outlet pipe increases (and both show an increasing trend, which also indicates that there is no pressure relief situation), it indicates that the water volume in the inner tank is sufficient; when the heating pipe is heating, if the water pressure P1 in the inner tank first increases and then decreases, and the water pressure P2 at the water outlet pipe first increases and then decreases, it indicates that there is a pressure relief situation (inner tank leakage, failure of the safety valve to prevent reverse flow, hot water discharged from the water outlet pipe, external leakage of the safety valve). Further, to distinguish the situation of hot water discharged from the water outlet pipe from other situations, it is necessary to further detect which of the decreases in P1 and P2 occurs earlier (usually, the position closer to a certain sensor is where the pressure relief occurs first, and that sensor is more likely to detect the pressure drop in advance). In this application, when the water pressure P1 in the inner tank exceeds the preset value P1 设 , the safety valve starts to leak externally. If the water pressure P1 in the inner tank still does not decrease after exceeding the preset value P1 设 , the external leakage of the safety valve fails, and it is not suitable to continue heating anymore.

[0071] Furthermore, the change between the maximum value of the water pressure signal P1 of the first water pressure sensor and the value at the end of the preheating time period t is not greater than the internal leakage pressure value of the safety valve, and the value of the preheating time period t is greater than the value that makes the change between the maximum value of the water pressure signal P1 of the first water pressure sensor and the value at the end of the preheating time period t not greater than the internal leakage pressure value of the safety valve. In the present application, when cold water is added to the water inlet pipe (the pressure change trend in the inner tank or at the water outlet pipe after water addition is close to a part of the sine curve, that is, from rapid change to steady change), the maximum value of the water pressure (P1 or P2) will be reached when the leakage point approaches the leakage critical value. At this time, because the increase in water pressure in turn reduces the water inlet, the heating of the heating tube can only play a more obvious role at this time and make the water pressure and water temperature change relatively simply due to heating. Therefore, the preheating time period t is lengthened (a period of heating time before the inner tank water pressure P1 reaches the maximum value, which cannot be analyzed deterministically due to the interference of water inlet). When the water intake is infinitely close to being equal to the water leakage, the pressure balance point will be reached (the water pressure at this time should be slightly lower than the maximum water pressure). At this time, the heating of the heating pipe may no longer have a significant effect on the change in water temperature (if the leakage is small, the heating of the heating pipe will affect the water temperature to a greater extent, and if the leakage is large, such as hot water discharged from the outlet pipe, the heating of the heating pipe may not necessarily significantly affect the water temperature). Until the end of the preheating time period t, the water pressure P1 of the first water pressure sensor can be roughly determined to be greatly affected by the heating pipe. Therefore, a part of the preheating time period t is limited to the range of "from the maximum value of the water pressure signal P1 of the first water pressure sensor" to "at the end of the preheating time period t". In the present application, in order to prevent the change in water pressure between the maximum value of the water pressure P1 in the inner tank and the end of the preheating time period t from affecting whether the cold water can be pressed into the inner tank, that is, to exclude the situation where the cold water cannot be pressed into the inner tank due to the change in water pressure between the maximum value of the water pressure P1 in the inner tank and the end of the preheating time period t caused by heating alone, the change value between the two is set to be no greater than the internal leakage pressure value of the safety valve. Preferably, the internal leakage pressure value of the safety valve is between 0.08MPa and 0.2MPa. In the present application, the preheating time period t is limited, which can further prevent the generation of excessive water vapor due to heating by the heating tube, thereby causing the water pressure and water temperature at the water outlet pipe to be affected by this interference factor. According to experience, the water pressure will increase by about 0.005MPa for every 20°C increase in the water temperature in the inner tank. In order to avoid the water vapor generated by heating from affecting the water pressure and water temperature at the water outlet pipe as much as possible, the preheating time period t shall not cause the water temperature in the inner tank to increase by more than 5°C.

[0072] See also Figure 5As shown, an intelligent heating control method includes an intelligent heating control system provided on an electric water heater. The electric water heater includes an inner tank 1, a water inlet pipe 2, and a water outlet pipe 3. The water inlet pipe 2 and the water outlet pipe 3 are respectively connected to the inner tank 1. The intelligent heating control system includes a controller, a detection unit, and an execution unit. The execution unit includes a heating pipe 4, and the heating pipe 4 extends into the inner tank 1. The controller is connected to the heating pipe 4 and controls the heating operation of the heating pipe 4. A safety valve 5 is installed on the water inlet pipe 2. The detection unit further includes a flow sensor installed on the water inlet pipe 2, a first water pressure sensor installed in the inner tank 1, a first water temperature sensor installed in the inner tank 1, a second water pressure sensor installed on the water outlet pipe 3, and a second water temperature sensor installed on the water outlet pipe 3. The controller controls whether the heating pipe 4 performs heating operation based on at least one of the flow signal L from the flow sensor, the water pressure signal P1 from the first water pressure sensor, the water temperature signal T1 from the first water temperature sensor, the water pressure signal P2 from the second water pressure sensor, and the water temperature signal T2 from the second water temperature sensor;

[0073] The controller first controls the heating pipe 4 to preheat for a period of time t. During the preheating period t,

[0074] When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor does not increase, the water temperature signal T1 of the first water temperature sensor does not increase, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that the inner tank 1 is short of water and dry burning occurs and controls the heating pipe 4 to stop heating; or,

[0075] When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that the water volume in the inner tank 1 is insufficient and controls the heating pipe 4 to stop heating; or,

[0076] When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases, and the water temperature signal T2 of the second water temperature sensor increases, the controller determines that the water volume in the inner tank 1 is sufficient and controls the heating pipe 4 to continue heating; or,

[0077] When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases and then decreases, and the water temperature signal T2 of the second water temperature sensor increases, the controller determines that at least one of the inner tank 1 leaks, the hot water is discharged from the water outlet pipe 3, or the safety valve 5 leaks. The controller controls the heating pipe 4 to stop heating;

[0078] And,

[0079] When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设 the safety valve 5 leaks. When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal 设 and still does not decrease, the controller determines that the safety valve 5 leaks and fails, and the controller controls the heating pipe 4 to stop heating;

[0080] Or,

[0081] When the flow sensor detects the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that the inner tank 1 is short of water and dry burns or the water volume in the inner tank 1 is insufficient and controls the heating pipe 4 to stop heating; or,

[0082] When the flow sensor detects the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, and the water pressure signal P2 of the second water pressure sensor increases, the controller determines that the water volume in the inner tank is sufficient and controls the heating pipe 4 to continue heating; or,

[0083] When the flow sensor detects the flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, and the water pressure signal P2 of the second water pressure sensor increases and then decreases, the controller determines that at least one of the inner tank 1 leaks, the safety valve 5 prevents backflow and fails, the water outlet pipe 3 discharges hot water, or the safety valve 5 leaks. And, when the decrease of the water pressure signal P1 of the first water pressure sensor is earlier than the decrease of the water pressure signal P2 of the second water pressure sensor, the controller determines that the inner tank 1 leaks, the safety valve 5 prevents backflow and fails, or the safety valve 5 leaks, and controls the heating pipe 4 to stop heating; or, when the decrease of the water pressure signal P1 of the first water pressure sensor is later than the decrease of the water pressure signal P2 of the second water pressure sensor, the controller determines that the water outlet pipe 3 discharges hot water and controls the heating pipe 4 to continue heating;

[0084] And,

[0085] When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设 the safety valve 5 leaks. When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal 设 and still does not decrease, the controller determines that the safety valve 5 leaks and fails, and the controller controls the heating pipe 4 to stop heating.

[0086] Preferably, the preset value P1 of the water pressure signal of the first water pressure sensor by the controller 设is equal to the leakage pressure value of the safety valve 5, and more preferably, the leakage pressure value of the safety valve 5 is 0.75Mpa to 0.85Mpa. Preferably, when the flow sensor does not detect the flow signal L, the value of the preheating time period t is such that the change value of the water pressure signal P1 of the first water pressure sensor between the beginning of the preheating time period t and the end of the preheating time period t is not greater than the internal leakage pressure value of the safety valve 5. In order to avoid the water vapor generated by heating from affecting the water pressure and water temperature at the water outlet pipe as much as possible, the preheating time period t shall not cause the water temperature in the inner tank to rise by more than 5°C. Preferably, when the flow sensor detects the flow signal L, the change value between the maximum value of the water pressure signal P1 of the first water pressure sensor and the end of the preheating time period t is not greater than the internal leakage pressure value of the safety valve, and the value of the preheating time period t is greater than such that the change value between the maximum value of the water pressure signal P1 of the first water pressure sensor and the end of the preheating time period t is not greater than the internal leakage pressure value of the safety valve. In order to avoid the water vapor generated by heating from affecting the water pressure and water temperature at the water outlet pipe as much as possible, the preheating time period t shall not cause the water temperature in the inner tank to rise by more than 5°C.

[0087] Although the specific embodiments of the present invention have been described above, those skilled in the art may modify them without departing from the spirit and principles of the present invention. The scope of protection of the present invention is defined by the claims and their equivalents.

Claims

1. An electric water heater with an intelligent heating control system, comprising an inner tank, a water inlet pipe, a water outlet pipe and an intelligent heating control system, wherein the water inlet pipe and the water outlet pipe are respectively connected to the inner tank, the intelligent heating control system comprises a controller, a detection unit and an execution unit, the execution unit comprises a heating pipe, the heating pipe extends into the inner tank, the controller is connected to the heating pipe and controls the heating operation of the heating pipe, and is characterized in that: A safety valve is installed on the water inlet pipe, and the detection unit also includes a flow sensor arranged on the water inlet pipe, a first water pressure sensor arranged in the inner tank, a first water temperature sensor arranged in the inner tank, a second water pressure sensor arranged on the water outlet pipe, and a second water temperature sensor arranged on the water outlet pipe. The controller controls whether the heating pipe performs heating work by receiving at least one of the flow signal L of the flow sensor, the water pressure signal P1 of the first water pressure sensor, the water temperature signal T1 of the first water temperature sensor, the water pressure signal P2 of the second water pressure sensor, and the water temperature signal T2 of the second water temperature sensor.

2. The electric water heater with intelligent heating control system according to claim 1, characterized in that: The intelligent heating control system further comprises an alarm, which gives an alarm after receiving an alarm indication from the controller.

3. The electric water heater with intelligent heating control system according to claim 1, characterized in that: The intelligent heating control system further comprises a remote transmitter, which sends alarm information to a user after receiving an alarm indication from the controller, and / or sends working status information to a user after receiving a working status sending indication from the controller.

4. The electric water heater with an intelligent heating control system according to any one of claims 1 to 3, characterized in that: The controller first controls the heating tube to preheat for a period of time t. During the preheating period t, When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor does not increase, the water temperature signal T1 of the first water temperature sensor does not increase, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that there is a lack of water in the inner pot and the inner pot is dry-burned, and controls the heating tube to stop heating; or, When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that there is insufficient water in the inner tank and controls the heating tube to stop heating; or, When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases, and the water temperature signal T2 of the second water temperature sensor increases, the controller determines that there is sufficient water in the inner tank and controls the heating tube to continue heating; or, When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases and then decreases, and the water temperature signal T2 of the second water temperature sensor increases, the controller determines that at least one of the following is true: the inner tank is leaking, the water outlet pipe is discharging hot water, or the safety valve is leaking, and the controller controls the heating tube to stop heating; as well as, The water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller. 设 When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal, the safety valve leaks. 设 If the pressure still does not decrease after the pressure drops, the controller determines that the safety valve has failed to leak, and the controller controls the heating tube to stop heating.

5. The electric water heater with intelligent heating control system according to claim 4, characterized in that: The controller presets a water pressure signal of the first water pressure sensor to a value P1 设 Equal to the leakage pressure value of the safety valve.

6. The electric water heater with intelligent heating control system according to claim 4, characterized in that: The value of the preheating time period t is set so that the change value of the water pressure signal P1 of the first water pressure sensor between the beginning of the preheating time period t and the end of the preheating time period t is not greater than the internal leakage pressure value of the safety valve.

7. The electric water heater with intelligent heating control system according to claim 4, characterized in that: When the flow sensor does not detect the flow signal L, the controller determines that the safety valve fails to leak internally or the cold water pressure is insufficient, or the controller determines that there is no backflow in the water inlet pipe.

8. The electric water heater with an intelligent heating control system according to any one of claims 1 to 3, characterized in that: The controller first controls the heating tube to preheat for a period of time t. During the preheating period t, When the flow sensor detects that the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that there is a lack of water in the inner pot and the inner pot is dry-burned or there is insufficient water in the inner pot and controls the heating tube to stop heating; or, When the flow sensor detects a flow signal L, the water pressure signal P1 of the first water pressure sensor increases, and the water pressure signal P2 of the second water pressure sensor increases, the controller determines that there is sufficient water in the inner pot and controls the heating tube to continue heating; or, When the flow sensor detects a flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, and the water pressure signal P2 of the second water pressure sensor increases and then decreases, the controller determines that at least one of the following is true: the inner tank is leaking, the safety valve fails to prevent backflow, the water outlet pipe discharges hot water, or the safety valve leaks. Moreover, when the water pressure signal P1 of the first water pressure sensor decreases earlier than the water pressure signal P2 of the second water pressure sensor, the controller determines that the inner tank is leaking, the safety valve fails to prevent backflow, or the safety valve leaks, and controls the heating tube to stop heating; or, when the water pressure signal P1 of the first water pressure sensor decreases later than the water pressure signal P2 of the second water pressure sensor, the controller determines that the water outlet pipe discharges hot water and controls the heating tube to continue heating. as well as, The water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller. 设 When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal, the safety valve leaks. 设 If the pressure still does not decrease after the pressure drops, the controller determines that the safety valve has failed to leak, and the controller controls the heating tube to stop heating.

9. The electric water heater with intelligent heating control system according to claim 8, characterized in that: The change value between the maximum value of the water pressure signal P1 of the first water pressure sensor and the end of the preheating time period t is not greater than the internal leakage pressure value of the safety valve, and the value of the preheating time period t is greater than the value that makes the change value between the maximum value of the water pressure signal P1 of the first water pressure sensor and the end of the preheating time period t not greater than the internal leakage pressure value of the safety valve.

10. An intelligent heating control method, comprising an intelligent heating control system provided on an electric water heater, wherein the electric water heater comprises an inner tank, a water inlet pipe and a water outlet pipe, wherein the water inlet pipe and the water outlet pipe are respectively connected to the inner tank, wherein the intelligent heating control system comprises a controller, a detection unit and an execution unit, wherein the execution unit comprises a heating pipe, wherein the heating pipe extends into the inner tank, wherein the controller is connected to the heating pipe and controls the heating operation of the heating pipe, wherein: The water inlet pipe is provided with a safety valve, the detection unit further comprises a flow sensor provided on the water inlet pipe, a first water pressure sensor provided in the inner tank, a first water temperature sensor provided in the inner tank, a second water pressure sensor provided on the water outlet pipe and a second water temperature sensor provided on the water outlet pipe, the controller controls whether the heating pipe performs heating operation by receiving at least one of a flow signal L of the flow sensor, a water pressure signal P1 of the first water pressure sensor, a water temperature signal T1 of the first water temperature sensor, a water pressure signal P2 of the second water pressure sensor and a water temperature signal T2 of the second water temperature sensor; The controller first controls the heating tube to preheat for a period of time t. During the preheating period t, When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor does not increase, the water temperature signal T1 of the first water temperature sensor does not increase, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that there is a lack of water in the inner pot and the inner pot is dry-burned, and controls the heating tube to stop heating; or, When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that there is insufficient water in the inner tank and controls the heating tube to stop heating; or, When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases, and the water temperature signal T2 of the second water temperature sensor increases, the controller determines that there is sufficient water in the inner tank and controls the heating tube to continue heating; or, When the flow sensor does not detect the flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, the water temperature signal T1 of the first water temperature sensor increases, the water pressure signal P2 of the second water pressure sensor increases and then decreases, and the water temperature signal T2 of the second water temperature sensor increases, the controller determines that at least one of the following is true: the inner tank is leaking, the water outlet pipe is discharging hot water, or the safety valve is leaking, and the controller controls the heating tube to stop heating; as well as, The water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller. 设 When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal, the safety valve leaks. 设 If the pressure still does not decrease after the pressure drops, the controller determines that the safety valve has failed to leak, and the controller controls the heating tube to stop heating; or, When the flow sensor detects that the flow signal L, the water pressure signal P1 of the first water pressure sensor increases, the water pressure signal P2 of the second water pressure sensor does not change, and the water temperature signal T2 of the second water temperature sensor does not change, the controller determines that there is a lack of water in the inner pot and the inner pot is dry-burned or there is insufficient water in the inner pot and controls the heating tube to stop heating; or, When the flow sensor detects a flow signal L, the water pressure signal P1 of the first water pressure sensor increases, and the water pressure signal P2 of the second water pressure sensor increases, the controller determines that there is sufficient water in the inner pot and controls the heating tube to continue heating; or, When the flow sensor detects a flow signal L, the water pressure signal P1 of the first water pressure sensor increases and then decreases, and the water pressure signal P2 of the second water pressure sensor increases and then decreases, the controller determines that at least one of the following is true: the inner tank is leaking, the safety valve fails to prevent backflow, the water outlet pipe discharges hot water, or the safety valve leaks. Moreover, when the water pressure signal P1 of the first water pressure sensor decreases earlier than the water pressure signal P2 of the second water pressure sensor, the controller determines that the inner tank is leaking, the safety valve fails to prevent backflow, or the safety valve leaks, and controls the heating tube to stop heating; or, when the water pressure signal P1 of the first water pressure sensor decreases later than the water pressure signal P2 of the second water pressure sensor, the controller determines that the water outlet pipe discharges hot water and controls the heating tube to continue heating. as well as, The water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal of the first water pressure sensor by the controller. 设 When the water pressure signal P1 of the first water pressure sensor exceeds the preset value P1 of the water pressure signal, the safety valve leaks. 设 If the pressure still does not decrease after the pressure drops, the controller determines that the safety valve has failed to leak, and the controller controls the heating tube to stop heating.

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