A PTC electric heater dry burning protection method and device and household appliances

A technology of electric heaters and protection devices, applied in ohmic resistance heating parts and other directions, can solve the problems of untimely protection, repeated protection, burnout, failure to identify faults, etc., and achieve the effect of avoiding accelerated PTC decay.

Active Publication Date: 2018-10-26
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventors of the present invention have found that there are at least the following problems in the above-mentioned prior art solutions: the electric heater may generate heat locally in the case of dry burning, and it takes a certain period of time to transfer the heat to the surroundings, and when the mechanical temperature control When the temperature of the electric heater or its surroundings detected by the electric heater reaches the set temperature, the components inside the electric heater may have been deformed or burned out
Therefore, the mechanical thermostat cannot timely identify the dry heating of the electric heater, and there are problems of untimely protection and repeated protection. timely protection

Method used

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  • A PTC electric heater dry burning protection method and device and household appliances

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Experimental program
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Effect test

Embodiment 1

[0040] This embodiment provides a dry-burning protection method for a PTC electric heater. The method is used in heating household appliances. When the fan of the heating household appliances (such as air conditioners, humidifiers, and heaters) fails It is timely to determine whether the PTC electric heater in the household appliance has dry burning, and timely protect the PTC electric heater that has a dry burning fault. Specifically, this PTC electric heating dry burning protection method comprises the following steps:

[0041] The step of detecting the maximum starting current: when the PTC electric heater is turned on, the maximum starting current of the PTC electric heater is collected.

[0042] The step of real-time detection of working current: after the PTC electric heater performs heating work, real-time detection of the working current of the PTC electric heater.

[0043] Identify dry burning and protection steps: judge whether the PTC electric heater has dry burnin...

Embodiment 2

[0046] Preferably, this embodiment proposes a dry-burning protection method for a PTC electric heater. Compared with Embodiment 1, in the steps of identifying dry-burning and protecting this embodiment, according to the maximum starting current of the PTC electric heater and The method of working current to judge whether the PTC electric heater has dry burning is as follows:

[0047]Determine whether the ratio of the working current of the PTC electric heater to the maximum starting current is less than the set value A, if so, determine that the PTC electric heater has dry burning, and control the PTC electric heater to enter the dry burning protection mode; if not, Then it is judged that the PTC electric heater does not have dry burning.

[0048] Preferably, the set value A in this embodiment is 10-80%. In actual selection, the larger the value of A, the earlier the fault will be found, but the probability of corresponding misjudgment will increase; the smaller the value of A...

Embodiment 3

[0050] Preferably, the present embodiment proposes a dry-burning protection method for a PTC electric heater. Compared with the above-mentioned embodiments, when the ratio of the working current to the maximum starting current of the PTC electric heater is less than the set value A (that is, the judgment is When the PTC electric heater has dry burning), then control the corresponding display (the display here can be the display on the heating household appliance, or it can be the PTC electric heater dry burning protection device described in the following embodiments. The display on the device) displays the dry-burning fault information (such as the corresponding fault code), and / or controls the corresponding alarm device to give an alarm (such as the buzzer beeps, the flashing light flashes), and the dry-burning fault is timely Feedback to users so that users can repair in time and improve the safety and reliability of products.

[0051] Taking heating and air-conditioning as...

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Abstract

The invention discloses a dry burning protection method and device for a PTC (positive temperature coefficient) electric heater as well as a household appliance and relates to the technical field of household appliances. The main technical scheme is that the dry burning protection method for the PTC electric heater comprises the following steps: collecting the maximum starting current of the PTC electric heater when the PTC electric heater starts; detecting the working current of the PTC electric heater in real time after the PTC electric heater performs heating work; judging whether dry burning occurs on the PTC electric heater according to the maximum starting current and the working current of the PTC electric heater; controlling the PTC electric heater to start a dry burning protection mode if dry burning occurs. The dry burning protection method is mainly used for timely judging whether the PTC electric heater is in a dry burning state, so that the PTC electric heater with a dry burning fault and the household appliance provided with the PTC electric heater can be protected timely.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a dry-burning protection method and device for a PTC electric heater and a household appliance. Background technique [0002] At present, household appliances such as air conditioners, humidifiers, and electric heaters generally use electric heaters with fans for heating. However, when the speed of the fan is reduced or stopped due to a stalled rotor, failure or low operating voltage, if the electric heater cannot be disconnected in time, the heating element will continue to dry and burn, which may lead to overheating of the whole household appliance. deformed and even caught fire. For PTC electric heaters (using ceramic PTC as a heating component), such as long-term work under dry burning conditions, PTC accelerated decay, insulation failure and short circuit caused by PTC sheet breakdown may also occur. [0003] The prior art mainly relies on a mechanical thermos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/02
CPCH05B3/02
Inventor 郑文力
Owner GREE ELECTRIC APPLIANCES INC
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