Control method and control system capable of preventing liquid heating equipment from parching

A technology of heating equipment and control system, which is applied in the direction of lighting and heating equipment, fluid heaters, etc., can solve the problems of electric heating life impact, safety issues not guaranteed, safety accidents, etc., to avoid long-term power-on work and The effect of dry burning, improving service life and avoiding safety accidents

Inactive Publication Date: 2012-07-11
QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. When there is no water or insufficient water in the system, the electric heating cannot be judged normally and dry burning occurs, which will affect the life of the electric heating, and more importantly, the safety problem cannot be guaranteed;
[0005] 2. If the contacts of the thermostat are stuck due to excessive current, the electric heating will always be energized and work, which may eventually cause a safety accident due to excessive temperature;
[0006] 3. The user

Method used

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  • Control method and control system capable of preventing liquid heating equipment from parching
  • Control method and control system capable of preventing liquid heating equipment from parching
  • Control method and control system capable of preventing liquid heating equipment from parching

Examples

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no. 1 example

[0058] The first preferred embodiment of the present invention provides such a control method for preventing dry burning of liquid heating equipment. The method uses a temperature measuring unit to collect temperature data in the heating equipment, and detects the temperature every 1 minute, denoted as Ti. The calculation unit subtracts the measured temperature Ti from the last measured temperature Ti-1 to obtain the temperature increase value ΔT within this minute. The temperature increase rate ΔT / t can be obtained by dividing the temperature increase value ΔT by the time interval of 1 minute.

[0059] The first judging unit compares the temperature increasing rate ΔT / t with the set temperature increasing rate threshold, if the temperature increasing rate threshold is not exceeded, the control unit judges that no dry burning occurs, continues normal heating and repeats the above detection and judging steps ; If the temperature increase rate ΔT / t exceeds the set temperature in...

no. 2 example

[0064] In the second embodiment, the control method for preventing dry burning of the liquid heating equipment uses the temperature measuring unit to collect temperature data in the heating equipment, and detects the temperature every 2 minutes, denoted as Ti. The calculation unit subtracts the measured temperature Ti from the last measured temperature Ti-1 to obtain the temperature increase value ΔT within these 2 minutes. The temperature increase rate ΔT / t can be obtained by dividing the temperature increase value ΔT by the time interval of 2 minutes.

[0065] The first judging unit compares the temperature increasing rate ΔT / t with the set temperature increasing rate threshold, if the temperature increasing rate threshold is not exceeded, the control unit judges that no dry burning occurs, continues normal heating and repeats the above detection and judging steps ; If the temperature increase rate ΔT / t exceeds the set temperature increase rate threshold, record it as an abn...

no. 3 example

[0072] In this embodiment, a heating device capable of preventing dry burning of liquid heating equipment is provided, the heating device includes a container for containing liquid, an electric heating tube 2, a temperature measuring unit, and a main chip, wherein the main chip includes a computing unit, a first A judging unit, a recording unit, a second judging unit, and a control unit, wherein the electric heating tube heats the liquid in the container, and the temperature measuring unit detects the temperature and transmits signals. The calculation unit on the main chip calculates the temperature rise rate inside the heating device; the first judging unit judges whether the temperature rise rate exceeds the set temperature rise rate threshold of 1°C / s; the recording unit records that the temperature rise rate continuously exceeds the temperature rise rate threshold The second judging unit further judges whether the number of consecutively exceeding the heating rate reaches 3...

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Abstract

The invention provides a control method and a control system, which can continuously detect temperature change in liquid heating equipment and calculate out temperature increasing rate. The temperature increasing rate is used for comparing with a set threshold value to judge whether parching happens. In order to avoid mistaken errors caused by factors of water level fluctuation and the like, the control method and the control system can collect data continuously for three times to judge whether parching happens. Simultaneously, light-emitting diode display lamps are utilized to give fault alarm to users to remind users of examining a water heater and a pipeline. The control method and the control system can judge whether parching happens according to speed of temperature rise in the liquid heating equipment to protect electrical heating, prolong service life of equipment, provide safety guarantee for using the liquid heating equipment and prevent safety accidents from happening.

Description

technical field [0001] The present invention relates to a control method and system for liquid heating equipment, and more specifically, to a control method and system for preventing dry heating of liquid heating equipment. Background technique [0002] With the development of society, the application of liquid heating equipment is becoming more and more common. However, when liquid heating equipment such as a water heater overheats, it can be dangerous, especially if the liquid boils dry. The heat accumulation may cause damage to the equipment, and even cause a fire or cause burns to the user. In the current prior art, for electric heating in water heaters or other hot water equipment, a thermostat is usually connected in series to the main circuit of the control power supply. When the water temperature reaches or exceeds the protection value, the thermostat is disconnected to cut off the power supply. If the electric heating is dry-burned, only when the dry-burning temper...

Claims

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Application Information

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IPC IPC(8): F24H9/20
Inventor 梁海山丛大超王峰时斌张锐钢赵永俊
Owner QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD
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