Electric water heater protection device
An electric water heater and security device technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of no anti-dry burning, slow thermal response speed of sensors, and large volume.
Inactive Publication Date: 2012-07-04
HAIMEN THE YELLOW SEA ENTREPRENEURSHIP PARK SERVICE CO LTD
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Problems solved by technology
[0005] In the prior art including the above-mentioned application, in terms of electric water heater protection against electric shock, there are generally disadvantages of large volume and high cost due to complex and huge mechanical structure or complicated control circuits.
[0006] In terms of anti-dry burning, there are also the following shortcomings: 1. Or there is no anti-dry burning function; 2. Or use "temperature sensor" as a temperature sensing device, and use anti-overheating technology to realize the anti-dry burning function
After many tests, it was found that the technical means of preventing dry burning by using the temperature sensor method in the prior art actually fails to achieve the purpose of preventing dry burning due to the slow thermal response speed of the sensor
Method used
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[0026] combine figure 1 , figure 2 , the first and second resistors R 1 , R 2 , the first and second capacitance C 1 、C 2 Symmetrical step-down circuits 101 and 102 are respectively formed at the L terminal and the N terminal of AC220V. The first to fourth diodes constitute the rectification circuit 103 . In the present invention, the step-down circuit and the rectifier circuit have conventional and special two functions: conventional function: step-down and rectification; special function: for the signal current I 1 and AC balance current I 2 Provide a circulation path. They are characterized by: the first resistor R 1 , the first capacitance C 1 After parallel connection, one end is connected to the L line of AC220V, and the other end is connected to the first diode D 1 The cathode of the third diode D 3 The positive pole is connected; the second resistor R 2 , the second capacitance C 2 After parallel connection, one end is connected to the N line of AC220V, a...
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The invention relates to an electric water heater protection device of which control signals are collected from the ground by a grounding electrode. When the water level in the heating container of the electric water heater is higher than the set water level and the grounding electrode connected to the water is connected with the protective grounding wire E, a control system automatically switches on a heating power, and the electric water heater works normally; when the water level in the heating container of the electric water heater is lower than the set water level and the electric water heater is in danger of being burned, the control system automatically cuts off the heating power; and when the grounding electrode is not connected with the protective grounding wire E and the electric water heater is in danger of causing electric shock, the control system also automatically cuts off the heating power. By using the invention, the operation safety of the electric water heater can be ensured.
Description
technical field [0001] The invention relates to the field of household appliances, in particular to a safety device for an electric water heater that controls heating power on and off by utilizing different conditions of whether the water in the electric heater is connected to a protective ground wire and whether the water level is too shallow. Background technique [0002] Electric water heaters are commonly used household appliances, which are divided into two types: water storage type and instant heating type, and any type of electric water heater must solve the safety problems of preventing electric shock and injury, and preventing dry burning and fire. [0003] The Chinese patent application number is: 200820164704.2, and the title of the invention is: A utility model application for an electric shock-proof water heater, which discloses a kind of anti-electric shock that installs a trumpet-shaped conductive wire or conductive electrode in the waterway, and guides the cur...
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IPC IPC(8): H02H7/00H02H3/26H02H5/00
Inventor 汪孟金李玮孙浙胜朱亮
Owner HAIMEN THE YELLOW SEA ENTREPRENEURSHIP PARK SERVICE CO LTD