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Electric water heater control method

An electric water heater and control method technology, applied in the electrical field, can solve the problems of high current and power, device damage, electric water heater circuit overload, etc., and achieve the effects of prolonging life, improving safety, and avoiding excessive current and power.

Inactive Publication Date: 2014-10-29
A O SMITH CHINA WATER HEATER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] and figure 1 Similar to the structure shown, the electric water heater in the prior art can include multiple PTC heating elements. However, after the electric water heater is powered on, multiple PTC heating elements start working at the same time, which may cause excessive current and power, causing the circuit of the electric water heater to overload. damage

Method used

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Embodiment Construction

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0025] The inventors found that in the prior art, after the electric water heater is powered on, multiple PTC heating elements start to work at the same time, which may cause excessive current and power, overload the circuit of the electric water heater, and damage the device. figure 2 It is the resistance-temperature (R-T) curve diagram of the PTC heating element in the embodiment of the present invention. figure 2 Among them, Rn is the rated temperature zero power resistance, Rmin is the minimum zero power resistance, TRmin is the temperature at the minimum resist...

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Abstract

The invention discloses an electric water heater control method. An electric water heater comprises at least two sets of PTC heating elements capable of conducting start control respectively. When the electric water heat is powered on, the at least two sets of PTC heating elements are controlled to be started in an alternate mode, and when the corresponding PTC heating element is stated each time, the actual highest total power of the electric water heater is less than the set highest total power. According to the electric water heater control method, when the electric water heater is powered on, the at least two sets of PTC heating elements do not start to work simultaneously, instead the PTC heating elements are started in the alternate mode, so that excessive current and power are prevented, circuit overload of the electric water heater cannot occur, components in the electric water heater are protected, safety of the electric water heater is improved, and service life of the electric water heater is prolonged.

Description

technical field [0001] The invention relates to the technical field of electrical appliances, in particular to a control method for an electric water heater. Background technique [0002] At present, electric water heaters mostly adopt PTC (Positive Temperature Coefficient, positive temperature coefficient) technology. . PTC thermistors can be used for temperature measurement and control in industry, and are also used for temperature detection and adjustment of certain parts of automobiles. They are also widely used in civilian equipment, such as controlling the water temperature of instant water boilers, air conditioners and cold storage. Use its own heating for gas analysis and wind speed machine and so on. [0003] A liquid heating rod is provided in the prior art, such as figure 1 As shown, the liquid heating rod includes a heating rod body 1 and a heat-resistant plastic seat 2 connected by bolts. The heating rod body 1 is composed of a stainless steel shell 3 and a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24H9/20
CPCH05B3/00F24H15/132F24H9/2014F24H15/395F24H15/37
Inventor 万华新李水清邵小荣王伟
Owner A O SMITH CHINA WATER HEATER CO LTD
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