Heat exchange tube self-cleaning method and heat pump water heater
A heat exchange tube and self-cleaning technology, which is applied in the direction of cleaning heat transfer devices, fluid heaters, lighting and heating equipment, etc., can solve the problems of poor cleaning effect, and achieve the effect of avoiding deformation and controlling the temperature of hot and cold water
Active Publication Date: 2020-12-29
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0004] In order to solve the defect of poor cleaning effect when the existing descaling scheme is used in heat exchange tubes, the present invention proposes a self-cleaning method for heat exchange tubes and a heat pump water heater
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[0028] Such as figure 1 As shown, the self-cleaning method of the heat exchange tube proposed by the present invention includes: performing a cooling step to keep the inner wall of the heat exchange tube in a wet and / or frosty low temperature state; and then quickly performing a temperature rise step to allow hot water to flush the heat exchange tube inner wall.
[0029] Regarding cooling steps.
[0030] There are two ways to implement the cooling step. In a preferred embodiment, the cooling step includes: providing cooling capacity to the heat exchange tube and filling the heat exchange tube with water, detecting the outlet temperature Ta of the heat exchange tube, and when the outlet temperature Ta is higher than the preset When the low temperature range is set, increase the cooling capacity provided to the heat exchange tube. When the outlet temperature Ta is lower than the preset low temperature range, reduce the cooling capacity provided to the heat exchange tube. By adj...
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The invention discloses a self-cleaning method of a heat exchange tube and a heat pump water heater. The self-cleaning method of the heat exchange tube comprises the following steps of: performing a cooling step to enable the inner wall of the heat exchange tube to be in a wet and / or frosted low-temperature state, and ensuring that the outlet temperature Ta is stably filled with water at a low temperature Ta+ / -1 DEG C for a preset low-temperature time T1; after that, quickly executing the heating step to flush the inner wall of the heat exchange tube with hot water. According to the invention,cold water and hot water are alternately supplemented into the heat exchange tube by performing a cooling step and a heating step, after the outlet temperature Tb is higher than the high temperatureT2, a compressor stops frequency rise, the rotating speed of a water pump is increased to R2, the preset high temperature time T2 is operated, and the cleaning of the heat exchange tube is completed.According to the invention, cold water and hot water are alternately and rapidly supplemented into the heat exchange tube by performing the cooling step and the heating step, and effective descaling is realized by utilizing the principle of thermal expansion and contraction, the difference of thermal expansion coefficients between scale and heat exchange tube materials and high water pressure flushing.
Description
technical field [0001] The invention relates to the technical field of self-cleaning methods, in particular to a self-cleaning method for heat exchange tubes and a heat pump water heater. Background technique [0002] After the heat exchange tubes used for water flow are used for a period of time, the calcium and magnesium ions in the water cause scaling, and the scale adheres to the inner wall of the heat exchange tubes. If it is not removed in time, it will not only affect the heat exchange efficiency of the heat exchange tubes, It also hinders the normal flow of water. In the prior art, there have been solutions for automatic descaling of heat exchange tubes, such as the invention patent with the publication number CN108204673A, which discloses an electric water boiler with automatic descaling, which first heats the electric heater and then cools the electric heater, which is completed by shrinking Descaling is not conducive to the natural shedding of scale, and its appl...
Claims
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IPC IPC(8): F28G9/00F28G15/00F24H9/20
CPCF24H9/0042F24H9/20F28G9/00F28G15/003
Inventor 袁明征李佳容邓志扬史帆
Owner GREE ELECTRIC APPLIANCES INC