CN212721531U - Building air conditioning unit operation monitoring system - Google Patents

Abstract

The utility model relates to a building air conditioning unit operation monitoring system, which comprises a wind speed detection module, a central air conditioning unit and a monitoring module, wherein the wind speed detection module is used for detecting the wind speed in a central air conditioning duct and outputting the wind speed; the comparison module is coupled to the output end of the wind speed detection module, compares the wind speed detection value with the reference signal and outputs a comparison result; the alarm module responds to the abnormal working signal of the central air conditioner output by the comparison circuit and sends out an alarm prompt.

Description

Building air conditioning unit operation monitoring system

Technical Field

The utility model belongs to the technical field of the central air conditioning technique and specifically relates to a building air conditioning unit operation monitoring system is related to.

Background

The air conditioning unit of the central air conditioner used in the current buildings regulates the operation of a compressor, a fan, an electronic expansion valve and the like through a controller, thereby conveying cold air into a room through a pipeline of an important air conditioner and realizing the refrigeration of the room.

The traditional Chinese patent with publication number CN202885173U discloses a variable-frequency central air conditioning system which comprises an air-cooled water chiller main unit and a water pump, wherein the water pump is connected with a water outlet pipe orifice of the air-cooled water chiller main unit, a water temperature sensor is arranged at a water return pipe orifice of the air-cooled water chiller main unit, a pipe temperature sensor is arranged in the air-cooled water chiller main unit, a low-flow-limiting protective water flow inductive switch is arranged between the water outlet pipe orifice of the air-cooled water chiller main unit and the water pump, and two air-cooled water chiller compressors are arranged in the air-cooled water chiller main unit; acquiring water temperature data at a water return pipe opening of a main machine of the air-cooled water chilling unit through a water temperature sensor; the pipe temperature data of the condenser of the air-cooled water chilling unit host is obtained through the pipe temperature sensor, so that the rotating speed of the water pump and the rotating speed and the input operation of the compressor of the air-cooled water chilling unit are automatically adjusted, the tracking control of the circulating water flow is automatically completed, the circulating water flow is matched with the refrigerating capacity of the air-cooled water chilling unit host, the power consumption is reduced, and the energy-saving and power-saving effects are achieved.

The above prior art solutions have the following drawbacks: this kind of frequency conversion central air conditioning system only detects the operation conditions of air conditioner from the cooling water set department, can't know the interior actual air supply condition of central air conditioning wind channel, when this frequency conversion central air conditioning system broke down, could only know central air conditioning through personnel's in the building reflection and have this information of trouble, caused the untimely of overhauing the air conditioner.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, one of the purposes of the utility model is to provide a building air conditioning unit operation monitoring system reaches the effect that in time reflects central air conditioning and has the trouble.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

an operation monitoring system for a building air conditioning unit, comprising:

the wind speed detection module (1) is used for detecting the wind speed in the central air-conditioning air duct and outputting a voltage signal;

the comparison module (3) is coupled to the output end of the wind speed detection module (1) and compares the voltage signal with the reference signal, when the voltage signal is higher than the reference signal, the comparison module outputs a high level, and when the voltage signal is lower than the reference signal, the comparison module outputs a low level;

and the alarm module (4) responds to the high level signal output by the comparison circuit (2) and gives out acousto-optic warning.

By adopting the technical scheme, when the operation monitoring system of the building air conditioning unit works, the wind speed detection module can detect the wind speed in the air duct of the central air conditioner, the voltage signal which is in direct proportion to the wind speed is output, the voltage signal is transmitted to the comparison module, the comparison module can compare the voltage signal transmitted by the wind speed detection module with the reference voltage Verf, when the comparison result of the comparison module is abnormal, the comparison module can transmit a signal to the alarm module to enable the alarm module to respond and send out an acousto-optic warning to prompt that the working state of the central air conditioner is abnormal, so that a worker can find out that the operation state of the central air conditioner is abnormal in time, and the central air conditioner can be overhauled in time.

The present invention may be further configured in a preferred embodiment as: the wind speed detection module comprises:

the wind speed detection unit is arranged in the central air-conditioning air duct and is used for detecting the wind speed in the air duct and outputting a wind speed frequency signal;

and the input end of the conversion unit is coupled with the output end of the wind speed detection unit and used for converting the wind speed frequency signal into a voltage signal and outputting the voltage signal.

Through adopting above-mentioned technical scheme, place the wind speed detecting element in the central air conditioning wind channel and can real-time detection wind speed in the wind channel, and output frequency and the proportional pulse signal of wind speed, thereby represent the wind speed in the current air conditioning wind channel with the pulse signal of different frequencies, and frequency signal is stronger than voltage signal interference killing feature, thereby promote the degree of accuracy that the wind speed detected, the pulse signal that the converting unit can be exported the wind speed detecting element afterwards converts the voltage signal that makes things convenient for the comparison module to carry out the comparison operation, thereby whether the operating condition of real-time detection central air conditioning exists unusually.

The present invention may be further configured in a preferred embodiment as: the comparison module comprises:

the LM393 chip comprises an INA + input end coupled with the signal output end of the wind speed detection unit, an INA-input end coupled with the output end of the reference signal Verf1, and an OUT1 output end coupled with the input end of the alarm module.

The present invention may be further configured in a preferred embodiment as: the front end of the comparison module is also coupled with a room temperature detection unit which is a temperature sensor, the temperature sensor is used for collecting the temperature of a room refrigerated by the central air conditioner, converting the temperature into an electric signal and outputting the electric signal to the comparison module, the output end of the temperature sensor is coupled with the INB-input end of the LM393 chip, and the INB + input end of the LM393 chip is coupled with the output end of a reference voltage Verf 2.

By adopting the technical scheme, the temperature sensor is placed indoors and carries out real-time detection on indoor room temperature, the output end of the temperature sensor transmits the detection result to the comparison module in the form of a voltage signal for comparison, so that whether the indoor temperature meets the condition of high-frequency work of an air conditioner is judged, the judgment condition of the building air conditioning unit operation monitoring system is optimized by introducing the parameter of the temperature, the probability of misjudgment of the building air conditioning unit operation monitoring system is reduced, and the detection accuracy is improved.

The present invention may be further configured in a preferred embodiment as: the comparison module further comprises:

the two input ends of the AND gate circuit are respectively coupled to the two output ends of OUT1 and OUT2 of the LM393 chip, and the output end of the AND gate circuit is coupled to the input end of the alarm module;

and two input ends of the NOR gate circuit are respectively coupled with two output ends of OUT1 and OUT2 of the LM393 chip, and the output end of the NOR gate circuit is coupled with the input end of the alarm module.

By adopting the technical scheme, when and only when the output levels of OUT1 and OUT2 are both high levels, the NAND gate outputs low levels, the output end of the AND gate outputs high levels, and the alarm circuit gives an alarm to prompt that the air conditioner is in a low-frequency abnormal state; and if and only if the output levels of the OUT1 and the OUT2 are both low levels, the AND gate circuit outputs low levels, or the output end of the NOR gate circuit outputs high levels, so that the alarm circuit gives an alarm to prompt that the air conditioner is in a high-frequency abnormal state at the moment.

The present invention may be further configured in a preferred embodiment as: the alarm module includes:

the low-frequency abnormity warning unit is coupled with the output end of the AND gate circuit, responds to the high level signal output by the AND gate circuit and gives out acousto-optic warning;

and the high-frequency abnormity alarm unit is coupled to the output end of the NOR gate circuit, responds to the high level signal output by the NOR gate circuit and gives out acousto-optic alarm.

By adopting the technical scheme, the low-frequency abnormal alarm unit and the high-frequency abnormal alarm unit respectively correspond to an AND gate and an OR NOT gate, so that different alarm modes are realized for different working abnormal states of the air conditioner, the workers can distinguish and judge the abnormality of the current central air conditioner conveniently, and convenience is provided for overhauling the central air conditioner.

The present invention may be further configured in a preferred embodiment as: the low-frequency abnormity warning unit comprises an NPN triode V1, a buzzer H1 and a light emitting diode VD1, wherein a base stage of the NPN triode V1 is coupled with an output end of an AND gate circuit, an emitter electrode of the triode V1 is coupled with a grounding end, a collector electrode of the NPN triode V1 is coupled with a negative electrode of a light emitting diode VD1, an anode of the light emitting diode VD1 is coupled with a power supply, an anode of the light emitting diode VD1 is coupled with an anode of a power supply section of the buzzer H1, and a negative electrode of the light emitting diode VD1 is coupled with a negative electrode of a power supply end of the buzzer H1.

By adopting the technical scheme, the output end of the AND gate circuit outputs a high level, so that the low-frequency abnormity warning unit responds, the output end of the AND gate circuit outputs a high level, the base level of the NPN type triode V1 is a high level, the NPN type triode V1 is conducted, the light emitting diode VD1 coupled to the collector electrode of the NPN type triode V1 and the buzzer H1 are electrified, and an audible and visual alarm is given out.

The present invention may be further configured in a preferred embodiment as: the high-frequency abnormity warning unit comprises an NPN type triode V2, a buzzer H2 and a light emitting diode VD2, wherein the base level of the NPN type triode V2 is coupled with the output end of the NOR gate circuit, the emitter of the triode V2 is coupled with the ground terminal, the collector of the NPN type triode V2 is coupled with the negative electrode of the light emitting diode VD2, the positive electrode of the light emitting diode VD2 is coupled with a power supply, the positive electrode of the light emitting diode VD2 is coupled with the positive electrode of the power supply section of the buzzer H2, and the negative electrode of the light emitting diode VD2 is coupled with the negative electrode of the power supply end of the buzzer H2.

By adopting the technical scheme, the output end of the NOR gate circuit outputs high level, so that the high-frequency abnormity warning unit responds, the output end of the NOR gate circuit outputs high level, the base level of the NPN type triode V2 is high level, so that the NPN type triode V2 is conducted, the light emitting diode VD2 coupled to the collector electrode of the NPN type triode V2 and the buzzer H2 are electrified and give out acousto-optic alarm, and the current output state abnormity of the central air conditioner is prompted.

In summary, the invention includes at least one of the following beneficial technical effects:

the arrangement of the wind speed detection module can detect the actual cooling condition of the central air conditioner in a cooling air supply channel of the central air conditioner, so that when no wind exists in the air channel due to the failure of the central air conditioner, workers are prompted by the alarm module in time;

the temperature sensor can detect the actual refrigeration effect of the air conditioner in a room, and when the temperature sensor detects that the indoor temperature is higher than a preset value for refrigeration of the central air conditioner in high-frequency work, a worker can be prompted by the alarm module in time;

the low-frequency abnormity alarm unit and the high-frequency abnormity alarm unit respectively correspond to an AND gate and an OR NOT gate, so that different alarm modes for different working abnormity states of the air conditioner are realized, and therefore, workers can distinguish and judge the abnormity of the current central air conditioner conveniently, and convenience is brought to maintenance of the central air conditioner.

Drawings

Fig. 1 is a block diagram of the present invention;

FIG. 2 is a partial circuit schematic intended to show a wind speed detection unit;

FIG. 3 is a partial circuit schematic intended to show a comparison unit;

FIG. 4 is a partial circuit schematic intended to show the LM393 chip;

FIG. 5 is a partial circuit schematic intended to show an AND gate circuit and an OR NOT gate circuit;

fig. 6 is a partial circuit schematic intended to show an alarm module.

Reference numerals: 1. a wind speed detection module; 11. a wind speed detection unit; 12. a conversion unit; 2. a room temperature detection unit; 3. a comparison module; 4. and an alarm module.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A building air conditioning unit operation monitoring system, refer to FIG. 1, includes wind speed detection module 1, comparison module 3 and alarm module 4; the output end of the wind speed detection module 1 is coupled with the input end of the comparison module 3, and the output end of the comparison module 3 is coupled with the input end of the alarm module 4; the input end of the comparison module 3 is also coupled with the room temperature detection unit 2.

When the operation monitoring system of the building air conditioning unit works, the wind speed detection module 1 can detect the wind speed in the air duct of the central air conditioner, the room temperature detection unit 2 can detect the indoor temperature, the wind speed detection module 1 and the room temperature detection unit 2 can transmit the detection result to the comparison module 3 in the form of a voltage signal, the comparison module 3 can compare the voltage signal transmitted by the wind speed detection module 1 and the room temperature detection unit 2 with the corresponding reference voltage, and when the comparison result of the comparison module 3 is abnormal, the comparison module 3 can transmit a signal to the alarm module 4 to enable the alarm unit to respond and prompt the working state of the central air conditioner to be abnormal.

Referring to fig. 2 and 3, the wind speed detection module 1 includes a wind speed detection unit 11 and a conversion unit 12, the wind speed detection unit 11 is a wind speed sensor P1, the wind speed sensor P1 is disposed in an air duct of the central air conditioner, an anode of a power supply port of the wind speed sensor P1 is coupled to a power supply, a cathode of the power supply port of the wind speed sensor P1 is coupled to a ground terminal, an output terminal of the wind speed sensor P1 can output a pulse signal whose frequency is proportional to a wind speed, and an output terminal of the wind speed sensor P1 is coupled to an input terminal of the conversion unit 12; the conversion unit 12 is a frequency-voltage converter, the frequency-voltage converter is an LM2907 chip, the LM2907 has eight pins, a first pin of the LM2907 is a frequency signal input terminal, a fourth pin of the LM2907 is a voltage signal output terminal, a sixth pin of the LM2907 chip is an anode of a power supply terminal, an eighth pin of the LM2907 chip is a cathode of a power supply section, a second pin, a third pin, a fifth pin and a seventh pin are all access pins of a peripheral circuit, and a numerical value proportional relation between an input frequency signal and an output voltage signal is changed by adjusting and adjusting voltages accessed to the second pin, the third pin, the fifth pin and the seventh pin; the first pin of the LM2907 chip is coupled to the output terminal of the wind speed sensor P1, the second pin of the LM2907 chip is coupled to the polar capacitor C1, the negative electrode of the polar capacitor C1 is coupled to the ground terminal, the third pin of the LM2907 chip is coupled to the polar capacitor C2, the negative electrode of the polar capacitor C2 is coupled to the ground terminal, two ends of the polar capacitor C2 are coupled in parallel to the resistor R1, the fourth pin of the LM2907 chip is coupled to the resistor R2, the other end of the resistor R2 is coupled to the ground terminal, the fifth pin and the sixth pin of the LM2907 chip are both coupled to the power supply, the seventh pin of the LM2907 chip is coupled to the comparison module 3 and to the connection node between the resistor R2 and the fourth pin of the LM2907 chip, and the eighth pin of the LM2907 chip is coupled to the ground terminal.

The wind speed sensor P1 placed in the central air-conditioning wind channel can detect the wind speed in the wind channel in real time and output a pulse signal with the frequency being in direct proportion to the wind speed, the pulse signal output by the wind speed sensor P1 can enter the input end of the LM2907 chip, the LM2907 chip can process the pulse signal and output a voltage signal with the frequency being in direct proportion to the pulse signal, and the voltage signal is transmitted to the comparison module 3 to be compared with the reference voltage.

Referring to fig. 4, the room temperature detecting unit 2 is a temperature sensor, the temperature sensor is an LM35 chip, the LM35 chip includes three pins, a first pin thereof is an anode of the power supply terminal, a second pin thereof is an output terminal, a third pin is a cathode of the power supply terminal, the anode of the power supply terminal of the LM35 chip is coupled with the power supply, the cathode of the power supply terminal of the LM35 chip is coupled with the ground terminal, and the output terminal of the LM35 chip is coupled with the comparing module 3.

The LM35 chip is placed indoor and carries out real-time detection to indoor room temperature, and the output of LM35 chip is carried the testing result to comparison module 3 with the form of voltage signal and is compared.

Referring to fig. 4 and 5, the comparison module 3 includes an LM393 chip, an and gate circuit, and a nor gate circuit, two comparators are integrated inside the LM393 chip, and can compare at most two sets of values, the LM393 chip signal input pin INA + is coupled to the seventh pin of the LM2907 chip, the INA-pin is coupled to the reference voltage Verf1, INB + is coupled to the reference voltage Verf2, INB-is coupled to the output terminal of the LM35 chip, the positive electrode of the power supply terminal of the LM393 chip is coupled to the power supply, and the negative electrode of the power supply terminal of the LM393 chip is coupled to the ground terminal; one of two input ends of the AND circuit is coupled with the OUT1 output end of the LM393 chip, the other input end is coupled with the OUT2 of the LM393 chip, one of two input ends of the NOR circuit is coupled with the OUT1 output end of the LM393 chip, and the other input end is coupled with the OUT2 of the LM393 chip; the output end of the AND gate circuit and the output end of the NOR gate circuit are both coupled with the input end of the alarm module 4.

The first comparator of the LM393 chip can compare the voltage signal reflecting the wind speed with a reference signal Verf1, when the voltage signal representing the wind speed is higher than the reference signal Verf1, the central air conditioner is in a non-low-frequency working state, namely, the central air conditioner refrigerates the indoor, at the moment, the first output end OUT1 of the LM393 chip outputs a high-level signal, when the voltage signal representing the wind speed is lower than the reference signal Verf1, the central air conditioner is in a low-frequency working state, at the moment, the first output end OUT1 of the LM393 chip outputs a low-level signal; the second comparator of the LM393 chip can compare the voltage signal reflecting the temperature with the reference signal Verf2, when the voltage signal representing the temperature is lower than the reference signal, it represents that the indoor temperature is lower than the preset temperature of the central air conditioner which needs high frequency operation, i.e. the central air conditioner should operate at low frequency at this time, the second output terminal OUT2 of the LM393 chip outputs high level signal, when the voltage signal representing the temperature is higher than the reference signal, it represents that the indoor temperature is higher than the preset temperature of the central air conditioner which needs high frequency operation, i.e. the central air conditioner should operate at high frequency and cool the room, at this time, the second output terminal OUT2 of the LM393 chip outputs low level signal, the and or not circuit can operate the levels output by the two output terminals OUT1, OUT2 of the LM393 chip, and when and only when the levels output by OUT1 and OUT2 are both high levels, i.e. the room temperature of the, when the air conditioner is in a high-frequency working state, the output end of the AND gate circuit outputs high level and enables the alarm circuit to give an alarm to prompt that the air conditioner is in a low-frequency abnormal state at the moment; and if and only if the output levels of the OUT1 and the OUT2 are both low levels, namely the room temperature is the temperature at which the central air conditioner should operate at high frequency, and the air conditioner is in a low-frequency working state, the output end of the NOR gate circuit outputs high level and the alarm circuit gives an alarm to prompt that the air conditioner is in a high-frequency abnormal state at the moment.

Referring to fig. 6, the alarm module 4 includes a low-frequency abnormality alarm unit and a high-frequency abnormality alarm unit, the low-frequency abnormality alarm unit includes an NPN type triode V1, a buzzer H1 and a light emitting diode VD1, a base stage of the NPN type triode V1 is coupled to an output terminal of the and gate circuit, a resistor R3 is further coupled in series between the base stage of the NPN type triode V1 and the output terminal of the and gate circuit, an emitter of the triode V1 is coupled to a ground terminal, a resistor R4 is further coupled in parallel between an emitter and a collector of the NPN type triode V1, a collector of the NPN type triode V1 is coupled to a cathode of the light emitting diode VD1, an anode of the light emitting diode VD1 is coupled to a power supply, and an anode and a cathode of the light emitting diode VD1 are coupled to an anode and a cathode of the buzzer H1 respectively; the high-frequency abnormity warning unit comprises an NPN type triode V2, a buzzer H2 and a light emitting diode VD2, wherein a base level of an NPN type triode V2 is coupled with an output end of a NOR gate circuit, a resistor R5 is further coupled between the base level of an NPN type triode V2 and the output end of the NOR gate circuit in series, an emitting electrode of a triode V2 is coupled with a grounding end, a resistor R6 is further coupled between an emitting electrode and a collecting electrode of the NPN type triode V2 in parallel, a collecting electrode of an NPN type triode V1 is coupled with a negative electrode of the light emitting diode VD2, an anode of a light emitting diode VD2 is coupled with a power supply, and an anode and a cathode of the light emitting diode VD2 are respectively coupled with an anode and a cathode of a power supply end of the buzzer.

When the room temperature is in the temperature at which the central air conditioner needs to operate at low frequency, and the air conditioner is in a high-frequency working state, the two input ends of the AND gate circuit and the NOR gate circuit are both at high level, the output end of the NOR gate outputs low level, the high-frequency abnormal alarm unit does not respond, the output end of the AND gate circuit outputs high level, so that the low-frequency abnormal alarm unit responds, the output end of the AND gate circuit outputs high level, the base level of the NPN type triode V1 is at high level, the NPN type triode V1 is conducted, and the light emitting diode VD1 coupled to the collector electrode of the NPN type triode V1 and the buzzer H1 are electrified to send out sound and light alarm; when the room temperature is in the temperature at which the central air conditioner is supposed to run at high frequency, and the air conditioner is in a low-frequency working state, the two input ends of the AND gate circuit and the NOR gate circuit are both at low level, the output end of the AND gate circuit outputs low level, the low-frequency abnormity alarm unit does not respond, the output end of the NOR gate circuit outputs high level, the high-frequency abnormity alarm unit responds, and the output end of the NOR gate circuit outputs high level, so that the base level of the NPN type triode V2 is at high level, the NPN type triode V2 is conducted, and the light emitting diode VD2 and the buzzer H2 which are coupled to the collector electrode of the NPN type triode V2 are electrified and give out.

The implementation principle of the embodiment is as follows:

when the operation monitoring system of the building air conditioning unit works, the wind speed sensor P1 placed in the wind channel of the central air conditioner can detect the wind speed in the wind channel in real time and output a pulse signal with the frequency being in direct proportion to the wind speed, the pulse signal output by the wind speed sensor P1 can enter the input end of the LM2907 chip, the LM2907 chip can process the pulse signal and output a voltage signal with the frequency being in direct proportion to the pulse signal and transmit the voltage signal to the input end of the first comparator of the LM393 chip, the LM35 chip is placed indoors and detects the indoor room temperature in real time, and the output end of the LM35 chip transmits the detection result to the input end of the second comparator of the LM393 chip in the form of the voltage signal; the first comparator of the LM393 chip can compare the voltage signal reflecting the wind speed with a reference signal Verf1, when the voltage signal representing the wind speed is higher than the reference signal Verf1, the central air conditioner is in a non-low-frequency working state, namely, the central air conditioner refrigerates the indoor, at the moment, the first output end OUT1 of the LM393 chip outputs a high-level signal, when the voltage signal representing the wind speed is lower than the reference signal Verf1, the central air conditioner is in a low-frequency working state, at the moment, the first output end OUT1 of the LM393 chip outputs a low-level signal; the second comparator of the LM393 chip can compare the voltage signal reflecting the temperature with the reference signal Verf2, when the voltage signal representing the temperature is lower than the reference signal, it represents that the indoor temperature is lower than the preset temperature of the central air conditioner requiring high frequency operation, i.e. the central air conditioner should operate at low frequency at this time, the second output terminal OUT2 of the LM393 chip outputs a high level signal, when the voltage signal representing the temperature is higher than the reference signal, it represents that the indoor temperature is higher than the preset temperature of the central air conditioner requiring high frequency operation, i.e. the central air conditioner should operate at high frequency to refrigerate the room, at this time, the second output terminal OUT2 of the LM393 chip outputs a low level signal.

The AND-gate circuit and the NOR-gate circuit can calculate the levels output by two output ends OUT1 and OUT2 of the LM393 chip, and when and only when the levels output by OUT1 and OUT2 are both high levels, namely the room temperature is the temperature at which the central air conditioner should operate at low frequency, and the air conditioner is in a high-frequency working state, the output end of the NOR-gate outputs a low level, the high-frequency abnormity warning unit does not respond, and the output end of the AND-gate circuit outputs a high level, so that the output end of the AND-gate circuit responds, the base level of the NPN type triode V1 is a high level, the NPN type triode V1 is conducted, a light emitting diode VD1 coupled to the collector electrode of the NPN type triode V1 is electrified, and a buzzer H1 sends OUT an audible and visual alarm; when and only when the output levels of the OUT1 and the OUT2 are both low levels, namely the room temperature is the temperature at which the central air conditioner should operate at high frequency, and the air conditioner is in a low-frequency working state, the two input ends of the and circuit and the nor circuit are both low levels, the output end of the and circuit outputs low levels, the low-frequency abnormal alarm unit does not respond, the output end of the nor circuit outputs high levels, so that the high-frequency abnormal alarm unit responds, the output end of the nor circuit outputs high levels, the base level of the NPN type triode V2 is high levels, the NPN type triode V2 is conducted, the light emitting diode VD2 coupled to the collector of the NPN type triode V2 and the buzzer H2 are electrified and give OUT an audible and visual alarm.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (8)

1. A building air conditioning unit operation monitoring system is characterized by comprising:

the wind speed detection module (1) is used for detecting the wind speed in the central air-conditioning air duct and outputting a voltage signal;

the comparison module (3) is coupled to the output end of the wind speed detection module (1) and compares the voltage signal with the reference signal, when the voltage signal is higher than the reference signal, the comparison module (3) outputs a high level, and when the voltage signal is lower than the reference signal, the comparison module outputs a low level;

and the alarm module (4) responds to the high level signal output by the comparison module (3) and gives out acousto-optic warning.

2. The building air conditioning unit operation monitoring system of claim 1, wherein: the wind speed detection module (1) comprises:

the wind speed detection unit (11) is arranged in the central air-conditioning air duct and used for detecting the wind speed in the air duct and outputting a wind speed frequency signal;

and the input end of the conversion unit (12) is coupled to the output end of the wind speed detection unit (11) and is used for converting the wind speed frequency signal into a voltage signal and outputting the voltage signal.

3. The building air conditioning unit operation monitoring system of claim 2, wherein: the comparison module (3) comprises:

the LM393 chip has an INA + input end coupled to the signal output end of the conversion unit (12), an INA-input end coupled to the output end of the reference signal Verf1, and an OUT1 output end coupled to the input end of the alarm module (4).

4. The building air conditioning unit operation monitoring system of claim 3, wherein: the temperature control system is characterized in that a room temperature detection unit (2) is further coupled to the INB-input end of the LM393 chip, the room temperature detection unit (2) is a temperature sensor, the temperature sensor is used for collecting the temperature of a room cooled by the central air conditioner and converting the temperature into an electric signal to be output, and the INB + input end of the LM393 chip is coupled to the output end of the reference signal Verf 2.

5. The building air conditioning unit operation monitoring system of claim 4, wherein: the comparison module (3) further comprises:

the two input ends of the AND gate circuit are respectively coupled to the two output ends of OUT1 and OUT2 of the LM393 chip, and the output end of the AND gate circuit is coupled to the input end of the alarm module (4);

and two input ends of the NOR gate circuit are respectively coupled with two output ends of OUT1 and OUT2 of the LM393 chip, and the output end of the NOR gate circuit is coupled with the input end of the alarm module (4).

6. The building air conditioning unit operation monitoring system of claim 5, wherein: the alarm module (4) comprises:

the low-frequency abnormity warning unit is coupled with the output end of the AND gate circuit, responds to the high level signal output by the AND gate circuit and gives out acousto-optic warning;

and the high-frequency abnormity alarm unit is coupled to the output end of the NOR gate circuit, responds to the high level signal output by the NOR gate circuit and gives out acousto-optic alarm.

7. The building air conditioning unit operation monitoring system of claim 6, wherein: the low-frequency abnormity warning unit comprises an NPN triode V1, a buzzer H1 and a light emitting diode VD1, wherein a base stage of the NPN triode V1 is coupled with an output end of an AND gate circuit, an emitter electrode of the triode V1 is coupled with a grounding end, a collector electrode of the NPN triode V1 is coupled with a negative electrode of a light emitting diode VD1, an anode of the light emitting diode VD1 is coupled with a power supply, an anode of the light emitting diode VD1 is coupled with an anode of a power supply section of the buzzer H1, and a negative electrode of the light emitting diode VD1 is coupled with a negative electrode of a power supply end of the buzzer H1.

8. The building air conditioning unit operation monitoring system of claim 6, wherein: the high-frequency abnormity warning unit comprises an NPN type triode V2, a buzzer H2 and a light emitting diode VD2, wherein the base level of the NPN type triode V2 is coupled with the output end of the NOR gate circuit, the emitter of the triode V2 is coupled with the ground terminal, the collector of the NPN type triode V2 is coupled with the negative electrode of the light emitting diode VD2, the positive electrode of the light emitting diode VD2 is coupled with a power supply, the positive electrode of the light emitting diode VD2 is coupled with the positive electrode of the power supply section of the buzzer H2, and the negative electrode of the light emitting diode VD2 is coupled with the negative electrode of the power supply end of the buzzer H2.

Images