Electric water heater control protection system and electric water heater
By setting up a strong and weak current conversion circuit and signal processing circuit in the leakage protection plug, combined with the communication detection function, the normal operation of the operator is solved, and the safety hazards and high maintenance costs caused by the user's private replacement of the power cord are solved, and the electricity is realized Safety and performance optimization of water heaters.
Patent Information
- Application Number
- CN202010032451.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-01-13
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2040-01-13
AI Technical Summary
When existing electric water heaters are replaced or connected to power cords by users, it is difficult to effectively monitor and prevent accidents, and the simple maintenance structure leads to high application and maintenance costs.
Design an electric water heater control and protection system, and use the built-in strong and weak current conversion circuit and signal processing circuit of the leakage protection plug to monitor the normal operation of the operator through the communication detection function. If the user replaces the power cord privately, the operator displays a fault and the user cannot Use normally to ensure that professional maintenance personnel can resume normal use.
It effectively reduces accidents caused by users' private replacement of power cords, simplifies the control circuit of the electric water heater, reduces application and maintenance costs, and optimizes performance, ensures user safety and improves user experience.
Smart Images
Figure CN111102751B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of fluid heaters, and in particular to an electric water heater control and protection system and an electric water heater. Background Art
[0002] At present, the mainstream electric water heaters with leakage detection function on the market have basically the same power-on control mode, and the electric control components used in the machine are also basically the same. The specific control structure can be found in the Chinese utility model patent with publication number CN207279980U. The operation panel and the power board are integrated and installed on the housing of the electric water heater. The operation panel is used for display, control and information processing, and the power board is used to convert strong and weak electricity and control the operation of the electric heater. The leakage detection is achieved through the leakage protection plug (leakage protection power cord).
[0003] In the actual application of electric water heaters, users often replace or connect the power cord of electric water heaters privately due to various reasons such as plug mismatch, service life, failure, etc. However, due to the lack of professional skills of ordinary users, it is easy to make mistakes and cause accidents. In addition, since the maintenance structure of electric water heaters is relatively simple, it is not particularly difficult to disassemble and assemble the power cord. Therefore, it is difficult to prevent or monitor the behavior of users replacing the power cord privately, and it is impossible to effectively control the safety of users using electric water heaters. Summary of the invention
[0004] In view of the problems existing in the prior art, the object of the present invention is to provide an electric water heater control and protection system which has low application and maintenance costs and prevents users from replacing power lines privately.
[0005] The present invention also provides an electric water heater having the electric water heater control and protection system.
[0006] To achieve the above objectives, the present invention adopts the following technical solutions.
[0007] A control and protection system for an electric water heater comprises: a leakage protection plug for controlling the on and off of strong electricity and an operator for controlling the operation of the electric water heater; the characteristic is that a strong-weak electricity conversion circuit is arranged in the leakage protection plug, the input end of the strong-weak electricity conversion circuit is connected to the strong electricity line of the leakage protection plug, and the output end of the strong-weak electricity conversion circuit is connected to the operator; the strong electricity output end of the leakage protection plug is directly connected to the electric heater of the electric water heater through a thermal circuit breaker.
[0008] More preferably, a signal processing circuit is further provided in the leakage protection plug, and a sub-control microcontroller for controlling the disconnection and resetting of the tripping device of the leakage protection plug is provided on the signal processing circuit, and the sub-control microcontroller communicates with the operator.
[0009] More preferably, a main control single chip microcomputer is provided on the operator, and there is wired or wireless communication between the main control single chip microcomputer and the auxiliary control single chip microcomputer.
[0010] More preferably, the signal processing circuit is connected between the strong and weak current conversion circuit and the operator to control the on and off of power supply between the strong and weak current conversion circuit and the operator.
[0011] More preferably, the operator is an operating display with a display function; the sub-control single-chip computer sends a detection signal to the operator within a fixed time, and the operator returns a confirmation signal after receiving the detection signal; if there is no abnormality in the entire signal transmission feedback cycle, the sub-control single-chip computer determines that the communication is normal, and the power transmission and communication with the operator are normal; if a signal is missing during the signal transmission feedback cycle, the sub-control single-chip computer determines that the communication is abnormal and sends a fault signal to the operator, and the operator displays the fault information after receiving the fault signal and controls all buttons to be unable to operate.
[0012] More preferably, a temperature sensor for detecting the water temperature in the inner tank is connected to the operation display.
[0013] More preferably, the operator is provided with a battery, and the output end of the strong and weak electricity conversion circuit is connected to the battery.
[0014] More preferably, a water flow sensor is connected to the operator, and the water flow sensor is used to detect the water flow of the electric water heater; the operator controls the action of the tripping device according to the signal fed back by the water flow sensor.
[0015] More preferably, the input end of the strong and weak current conversion circuit is connected to the front end of the tripping device of the leakage protection plug.
[0016] An electric water heater, characterized by having the electric water heater control and protection system as described above.
[0017] The beneficial effects of the present invention are:
[0018] 1. By setting up a strong and weak current conversion circuit in the leakage protection plug, the leakage protection plug is used instead of the traditional power board to perform strong and weak current conversion and control the on and off function of the electric heater, which effectively reduces the application and maintenance cost of the entire electric water heater electronic control system, simplifies the control circuit of the entire electric water heater, reduces costs and optimizes performance; in addition, when the user replaces the power cord by himself, the operator cannot work because the ordinary power cord lacks a weak current power supply line, which effectively reduces the possibility of accidents after the user replaces the power cord privately.
[0019] Second, by setting up a signal processing circuit and adding a communication detection function between the signal processing circuit and the operator, even if the operator has its own battery, once the user privately replaces or connects the power cable, the operator will always display a fault due to the lack of transmission feedback of the detection signal, and the user cannot use the electric water heater normally. Only by contacting professional maintenance personnel can normal use be restored, which can avoid accidents caused by privately replacing the power cord incorrectly. At the same time, due to the existence of the communication detection system, when there is a problem with the leakage protection power cord or the operator, the failure of the device function can be discovered in time.
[0020] 3. Since the input end of the weak current conversion circuit is connected to the front end of the trip device of the leakage protection plug, the operator can still be powered normally after the electric heater is powered off, which solves the contradiction between the power off of the whole machine and the visual interface of the whole machine when the user is bathing, protecting the user's safety while improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 Shown is the electrical schematic diagram of the electric water heater control and protection system provided by the present invention.
[0022] Figure 2 Shown is a schematic diagram of the working principle of the leakage protection plug in the present invention.
[0023] Figure 3 Shown is a working flow chart of the electric water heater control and protection system provided by the present invention.
[0024] Description of reference numerals:
[0025] 1: Leakage protection plug, 2: Operator, 3: Thermal circuit breaker, 4: Electric heater, 5: Temperature sensor, 6: Water flow sensor.
[0026] 1-1: strong and weak current conversion circuit, 1-2: tripping device, 1-3: leakage detection device, 1-4: energy storage capacitor, 1-5: signal processing circuit.
[0027] 2-1: Main control microcontroller. DETAILED DESCRIPTION
[0028] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.
[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "at least" means one or more, unless otherwise clearly and specifically defined.
[0030] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0031] In the invention, unless otherwise specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “below”, and “above” a second feature includes that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “above”, “below”, and “below” a second feature includes that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0032] The following is a further description of the specific implementation of the present invention in conjunction with the drawings of the specification, so that the technical solution and its beneficial effects of the present invention are clearer and more explicit. The following description of the embodiments with reference to the drawings is exemplary and intended to explain the present invention, but cannot be understood as limiting the present invention.
[0033] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention.
[0034] Example 1
[0035] like Figure 1 , Figure 2 As shown, a control and protection system for an electric water heater comprises: a leakage protection plug 1 for controlling the on and off of strong electricity and an operator 2 for controlling the operation of the electric water heater; characterized in that a strong-weak electricity conversion circuit 1-1 is provided in the leakage protection plug 1, the input end of the strong-weak electricity conversion circuit 1-1 is connected to the strong electricity line of the leakage protection plug 1, and the output end of the strong-weak electricity conversion circuit 1-1 is connected to the operator 2 and powered by it; the strong electricity output end of the leakage protection plug 1 is directly connected to the electric heater 4 of the electric water heater through a thermal circuit breaker 3.
[0036] The strong and weak current conversion circuit 1-1 is a rectifier and step-down circuit, which is used to convert the AC mains into a DC working power supply for the main control microcontroller 2-1 of the operator 2. The specific circuit design of the strong and weak current conversion circuit 1-1 is common technical knowledge mastered by ordinary technicians in this field, and will not be described in detail here.
[0037] A tripping device 1-2, a leakage detection device 1-3 and an energy storage capacitor 1-4 are connected to the high-voltage circuit of the leakage protection plug 1. When the leakage detection device 1-3 detects a leakage signal, a disconnection instruction is given to the tripping device 1-2 to control the tripping device 1-2 to disconnect the three poles of the circuit; the energy storage capacitor 1-4 supplies power to the tripping device 1-2.
[0038] Furthermore, a signal processing circuit 1-5 is also provided in the leakage protection plug 1, and a sub-control single chip microcomputer for controlling the disconnection and resetting of the tripping device 1-2 is provided on the signal processing circuit 1-5, and the sub-control single chip microcomputer communicates with the main control single chip microcomputer 2-1 by wire or wireless communication. As for the peripheral circuit design of the main control single chip microcomputer and the sub-control single chip microcomputer, they are all common technical knowledge mastered by those skilled in the art, and will not be described in detail here.
[0039] In this embodiment, the signal processing circuit 1-5 is preferably also connected between the strong and weak current conversion circuit 1-1 and the operator 2 to control the power supply between the strong and weak current conversion circuit 1-1 and the operator 2. The operator 2 is preferably an operation display with a display function.
[0040] In actual operation, the auxiliary control single chip computer sends a detection signal to the operator 2 within a fixed time, and the operator 2 returns a confirmation signal after receiving the detection signal; if there is no abnormality in the entire signal transmission feedback cycle, the auxiliary control single chip computer determines that the communication is normal, and the power transmission and communication between the operator 2 are normal; if the signal is missing in the signal transmission feedback cycle, the auxiliary control single chip computer determines that the communication is abnormal, sends a fault signal to the operator 2, and the operator 2 displays the fault information after receiving the fault signal and controls all buttons to be unable to operate. Here, the advantage of setting the communication detection function is that even if the operator has a battery connected to the output end of the strong and weak electricity conversion circuit, once the user privately replaces or connects the power line, the operator will always display a fault due to the lack of transmission feedback of the detection signal, and the user cannot use the electric water heater normally. Only by contacting professional maintenance personnel can normal use be restored, which can avoid accidents caused by privately replacing the power line incorrectly to the greatest extent. At the same time, due to the existence of the communication detection system, it is ensured that when there is a problem with the leakage protection power line or the operator, the device function failure problem can be discovered in time.
[0041] Further preferably, a temperature sensor 5 for detecting the water temperature of the inner tank and a water flow sensor 6 for detecting the water flow of the electric water heater are connected to the operation display. When the operator 2 collects the water flow signal of the water flow sensor 6, it will synchronously send a signal to the leakage protection plug 1. Regardless of whether the tripping device of the leakage protection plug 1 is connected at this time, the tripping device will be forced to remain disconnected during the duration of the water flow signal. The three-pole strong current circuit of the entire electric water heater is disconnected to avoid the possibility of electric shock when the user uses water or touches the electric water heater. Due to the advantages of this technology, the strong and weak current conversion circuit 1-1 is at the front end of the tripping device 1-2, so even if the strong current circuit is disconnected, the weak current circuit can continue to remain in an energized working state. It can improve the disadvantage that the user cannot understand the actual use of the electric water heater after the leakage protection plug is disconnected due to water outlet. After the user stops using water, after a fixed time or after the user manipulates the operator 2, the forced disconnection state of the tripping device 1-2 is released. The operator 2 will determine whether the leakage protection plug 1 needs to be connected to the trip device 1-2 and whether the electric heater needs to be started for heating according to the existing functional status requirements.
[0042] The present embodiment provides an electric water heater control and protection system. After the leakage protection plug 1 comes out of the circuit, only the weak current connection operator 2 is used for the whole machine display and logic processing; the strong current connection load electric heater 4 is used for heating and heat preservation. The leakage protection plug 1 directly has the function of converting strong and weak electricity and controlling the electric heater of the traditional power board. The on and off of the tripping device is used to control whether the power supply of the electric heater is connected. The functional control device of the entire electric water heater is only the leakage protection plug and the operator, which reduces the use cost and maintenance cost of the power board and relay. At the same time, there is a tripping mechanism and a leakage detection system in the strong power supply line part. When leakage is detected, the three poles of the plug are disconnected, and 220V power is continuously provided to the load when there is no leakage. There is a strong and weak current conversion circuit and a signal processing circuit in the weak current signal line part. The signal processing circuit is used to transmit and process the signal and send instructions. The signal loop can also control the action of the tripping device through the operator 2 to disconnect the power supply, which is widely used.
[0043] Example 2
[0044] An electric water heater, characterized by having the electric water heater control and protection system described in Example 1.
[0045] The electric water heater provided in this embodiment, except for the control and protection system, may be an electric water heater structure that is currently known or can be realized in the future, and will not be described in detail here.
[0046] Through the description of the above structure and principle, those skilled in the art should understand that the present invention is not limited to the above specific implementations, and improvements and substitutions based on the present invention using the known technology in the art fall within the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims and their equivalents. Parts not described in the specific implementations are prior art or common knowledge.
Claims
1. An electric water heater control and protection system, comprising: A leakage protection plug for controlling the on and off of strong electricity and an operator for controlling the operation of an electric water heater; characterized in that a strong-weak electricity conversion circuit is provided in the leakage protection plug, the input end of the strong-weak electricity conversion circuit is connected to the strong electricity line of the leakage protection plug, and the output end of the strong-weak electricity conversion circuit is connected to the operator; the strong electricity output end of the leakage protection plug is directly connected to the electric heater of the electric water heater through a thermal circuit breaker; A signal processing circuit is also provided in the leakage protection plug, and a sub-control single chip microcomputer for controlling the disconnection and resetting of the tripping device of the leakage protection plug is provided on the signal processing circuit, and the sub-control single chip microcomputer communicates with the operator; A main control single chip microcomputer is provided on the operator, and there is wired or wireless communication between the main control single chip microcomputer and the auxiliary control single chip microcomputer; The signal processing circuit is connected between the strong and weak current conversion circuit and the operator, and is used to control the power supply on and off between the strong and weak current conversion circuit and the operator; The operator is an operation display with a display function; the sub-control single-chip computer sends a detection signal to the operator within a fixed time, and the operator returns a confirmation signal after receiving the detection signal; if there is no abnormality in the entire signal transmission feedback cycle, the sub-control single-chip computer determines that the communication is normal, and the power transmission and communication between the operator and the operator are normal; if a signal is missing during the signal transmission feedback cycle, the sub-control single-chip computer determines that the communication is abnormal and sends a fault signal to the operator. After receiving the fault signal, the operator displays the fault information and controls all buttons to be unable to operate.
2. The electric water heater control and protection system according to claim 1, characterized in that: The operation display is connected with a temperature sensor for detecting the water temperature of the inner tank.
3. The electric water heater control and protection system according to claim 1, characterized in that: The operator is provided with a storage battery, and the output end of the strong and weak electricity conversion circuit is connected to the storage battery.
4. The electric water heater control and protection system according to claim 1, characterized in that: A water flow sensor is connected to the operator, and the water flow sensor is used to detect the water flow of the electric water heater; the operator controls the action of the tripping device according to the signal fed back by the water flow sensor.
5. The electric water heater control and protection system according to claim 1, characterized in that: The input end of the strong and weak current conversion circuit is connected to the front end of the tripping device of the leakage protection plug.
6. An electric water heater, characterized in that: A control and protection system for an electric water heater as claimed in any one of claims 1 to 5.