Analiza od uporaba termoelementov v kisik pomanjkanje zaščita naprave

Gas heaters are commonly used indoor heating equipment in households, which require oxygen consumption during operation. In poorly ventilated conditions, long-term operation can cause indoor hypoxia, causing discomfort and even suffocation, endangering personal safety. Therefore, there must be a hypoxia maintenance plan. The function of oxygen deficiency maintenance equipment is to automatically close the control valve and display an alarm indicating oxygen deficiency when the equipment detects a low oxygen content in the indoor air, reminding users to ventilate and exchange air. It is a common temperature sensor widely used in temperature measurement. Its principle is to connect the two ends of two different conductors into a closed circuit, and due to the unequal temperature at both ends, a thermoelectric potential is generated in the circuit. This phenomenon is called thermoelectric phenomenon in physics. This article mainly plans a hypoxia maintenance equipment using thermoelectric phenomena.
1, The Working princip of kisik pomanjkljivo vzdrževanje oprema
The working principle of this maintenance is that when the gas supply and oxygen supply are constant, the flame incineration temperature is also constant. When the oxygen content in the air is sufficient, the flame temperature can reach around 700 degree ; When the oxygen content in the air decreases, the flame temperature also decreases. According to American standards, the temperature of the flame in an anaerobic state does not exceed 450 degree , and the thermoelectric potential is 1815mV at a relative temperature of 450 degree . If the temperature of the constant flame measured by the thermocouple is not good, it can be considered that the oxygen content in the air is not high, and an alarm needs to be triggered and the control valve needs to be closed. The hypoxia maintenance function of this scheme is completed as follows: a wide temperature microcontroller AT89C2051 is selected, which comes with an internal analog comparator, and P110 and P111 are the input pins of the comparator. Connect a potential signal of 1815mV to pin P111, where the voltage signal at the reference end requires stability. Therefore, connect a voltage regulator at the VCC. After amplifying the flame temperature signal measured by the thermocouple, connect it to the P110 pin, and then use its internal analog comparator to compare these two electrical signals. If the signal of pin P110 is lower than that of pin P111, it indicates indoor hypoxia. At this time, the control valve is closed and an alarm is displayed.
2, strojna oprema sestava
This device mainly consists of a microcontroller, thermocouple, and potentiometer. The microcontroller selection is AT89C2051, an efficient microcontroller launched by ATMEL in the United States. It comes with an internal analog comparator, and P110 and P111 are the input pins of the comparator. This imitation comparator can be used to achieve hypoxia maintenance function. The instruction of AT89C2051 is fully compatible with INTEL's MCS-51 series microcontroller, and it comes with a 2K byte flash programmable erasable read-only memory. Choosing this chip can greatly simplify circuit planning, and it can also complete other functions of the heater together. It will not be repeated here. The K-type thermocouple is selected as the thermocouple, and the received thermoelectric potential signal is amplified and processed by an amplifier before being connected to a microcontroller. This thermocouple also plays a role in collecting the temperature signal of a constant open flame in the heater. The potential signal of the potentiometer is 1815mV, and its reference terminal is connected to a voltage stabilizing source 358B-25.

3, povzetek
kisik pomanjkanje vzdrževanje oprema deluje normalno v dnev plin plin grelniki in has been preskušen za dva zaporedna meseca mesec brez okvare. Due do the uporaba termočleni as senzorji, ki so cenejši od drugi senzorji in imajo stabilne funkcije, this naprava tudi has a visoki stroški zmogljivost razmerje.