CN217901045U

CN217901045U - Low-voltage power grid temperature monitoring sensor

Info

Publication number: CN217901045U
Application number: CN202221769443.3U
Authority: CN
Inventors: 王海良; 柴刚强; 龚成相; 王晨烨
Original assignee: Minpu Electric Group Co ltd
Current assignee: Minpu Electric Group Co ltd
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2022-11-25
Anticipated expiration: 2032-07-08

Abstract

The utility model relates to a low voltage electric wire netting temperature monitoring sensor, which comprises a housin, the circuit board of setting in the casing, the setting is at the hot junction temperature acquisition thermocouple of casing one end, the power input wire of setting in hot junction temperature acquisition thermocouple one side, the setting is at the cold junction temperature acquisition thermocouple of the casing other end, the temperature monitoring alarm signal output wire of setting in cold junction temperature acquisition thermocouple one side, the circuit board includes MCU, the human-computer interaction module, temperature anomaly alarm module, the temperature acquisition module, the voltage stabilizing module, outside storage module, communication module, power module, temperature acquisition module's output, MCU's input is connected respectively to voltage stabilizing module's output, MCU's output connection temperature anomaly alarm module's input, the human-computer interaction module, outside storage module, communication module is connected with the MCU electricity respectively. The utility model discloses low pressure electric wire netting temperature monitoring sensor has with low costs, data transmission stability is high, application scope is wide advantage.

Description

Low-voltage power grid temperature monitoring sensor

Technical Field

The utility model relates to a temperature monitoring technology field especially relates to a low pressure electric wire netting temperature monitoring sensor.

Background

Many enterprises advocate preventive maintenance of equipment, and temperature is the most important monitoring parameter in preventive maintenance, and too high or too low temperature means the possibility of failure. The existing electrical equipment often has local heating in normal operation, and the heating positions are usually positioned at power connectors or on power transmission with poor heat dissipation conditions, so in order to prevent faults caused by the local heating of the equipment, a temperature sensor needs to be installed at a position which is easy to cause the heating so as to monitor the heating condition of the equipment, and the function of protecting the normal operation of the equipment is achieved. Its current temperature preventive maintenance mostly uses wireless temperature measuring device, and wireless temperature measuring device has wireless collection, wireless transmission's advantage, but wireless transmission's mode receives external disturbance easily, has the unstable condition of signal transmission to take place, so have the defect of data transmission poor stability, and its wireless temperature measuring device mostly is used for high-tension apparatus's temperature monitoring, so application scope is not wide, and wireless temperature measuring device still has with high costs problem.

Disclosure of Invention

In view of this, the utility model aims at providing a low pressure electric wire netting temperature monitoring sensor with low costs, data transmission stability is high, application scope is wide.

In order to realize above mesh, the utility model discloses a such low voltage electric wire netting temperature monitoring sensor, including the casing, set up circuit board in the casing, set up at the hot junction temperature acquisition thermocouple of casing one end, set up at the power input wire of hot junction temperature acquisition thermocouple one side, set up at the cold junction temperature acquisition thermocouple of the casing other end, set up the temperature monitoring alarm signal output wire in cold junction temperature acquisition thermocouple one side, the circuit board includes MCU, human-computer interaction module, temperature anomaly alarm module, temperature acquisition module, voltage stabilizing module, outside storage module, communication module, power module, MCU's input is connected respectively to temperature acquisition module's output, voltage stabilizing module's output, MCU's output is connected temperature anomaly alarm module's input, human-computer interaction module, outside storage module, communication module are connected with the MCU electricity respectively, power module provides operating voltage for MCU, human-computer interaction module, temperature anomaly alarm module, temperature acquisition module, voltage stabilizing module, outside storage module, communication module respectively.

The utility model further set up to MCU is HC32L136J8TA.

The beneficial effects are as follows: the temperature sensor adopts a thermocouple wired transmission mode, achieves the effect of strong interference resistance, realizes the advantage of high data transmission stability, has the effects of small heat capacity and small thermal hysteresis, can be widely applied to various temperature measuring occasions, and has the advantage of wide application range compared with a wireless temperature measuring device.

The utility model discloses further set up to the sensor still including temperature display screen, temperature warning light, function setting button, buckle, screw hole, temperature display screen sets up on the casing, the temperature warning light sets up the lower extreme at the temperature display screen, function setting button sets up the lower extreme at the temperature warning light, the buckle sets up the one side at the casing, the screw hole sets up one side at one side of power input wire, one side of temperature monitoring alarm signal output wire respectively.

Among the above-mentioned technical scheme, the structure setting of temperature display screen acts on the temperature display, and the structure setting of temperature warning light acts on the temperature warning when the temperature anomaly is reported to the police, and the structure setting of function setting button acts on the user and can adjust by oneself, and the structure setting of buckle acts on and hangs the dress, and the structure setting of its screw hole acts on fixed mounting.

This practicality further sets up to temperature acquisition module includes connector JY1, connector JY2, temperature acquisition circuit includes resistance RN1 ~ RN8, electric capacity CN1 ~ CN8, resistance RN1 series capacitance CN1, resistance RN2 series capacitance CN2, resistance RN3 series capacitance CN3, resistance RN4 series capacitance CN4, resistance RN5 series capacitance CN5, resistance RN6 series capacitance CN6, resistance RN7 series capacitance CN7, resistance RN8 series capacitance CN8, connector JY 1's output is connected respectively to resistance RN 1's one end, resistance RN 2's one end, resistance RN 3's one end, resistance RN 4's one end, connector JY 1's output is connected respectively, resistance RN 5's one end, resistance RN 6's one end, resistance RN 7's one end, resistance RN 8's one end connect connector JY 2's output respectively, resistance RN 1's the other end, resistance RN 2's the other end, resistance RN 3's the other end, resistance RN 4's the other end, resistance RN 5's the other end, resistance RN 7's the other end, the resistance RN 8's other end, the equal ground connection electric capacity CN3, the equal CN3 of electric capacity CN4 one end.

The technical scheme has the function of collecting temperature signals, and can convert the temperature quantity on site into digital signals.

The utility model discloses it includes one-level voltage stabilizing circuit, secondary voltage stabilizing circuit to set up to the voltage stabilizing module further, one-level voltage stabilizing circuit includes three terminal regulator UD2, electrolytic capacitor CE4, electric capacity CD4, three terminal regulator UD 2's third pin VIN end input supply voltage VCC, three terminal regulator UD 2's second pin VOUT end is connected electrolytic capacitor CE 4's positive pole, electric capacity CD 4's one end respectively, three terminal regulator UD 2's first pin GND end, electrolytic capacitor CE 4's negative pole, electric capacity CD 4's the other end all ground connection, three terminal regulator UD 2's second pin VOUT end output midpoint voltage +5VC to secondary voltage stabilizing circuit, secondary voltage stabilizing circuit includes three terminal regulator 3, electrolytic capacitor CE5, electric capacity CD10, inductance L2's one end, high level, three terminal regulator UD 3's third pin input midpoint voltage +5VC, three terminal regulator UD 3's second pin VOUT end is connected electrolytic capacitor CE 5's positive pole, electric capacity CD 5's one end, inductance L2's one end, high level, inductance CD 2's the other end connection electric capacity CD10 AC voltage stabilizing circuit UD 3's the other end, the three terminal AC capacitance CE5 the other end of three terminal AC voltage stabilizing circuit.

The technical scheme has the function of stabilizing voltage, and can control the output voltage with larger current fluctuation within a fixed value range to ensure the normal work of the circuit.

The utility model discloses it includes connector JY4, temperature anomaly alarm circuit to set up further to temperature anomaly alarm module, temperature anomaly alarm circuit includes resistance RQ2, resistance R16, diode D3, electric capacity C5, opto-coupler OP1, field effect pipe TQ1, power relay JDQ2, opto-coupler OP 1's first pin connecting resistance RQ 2's one end, MCU's twentieth pin OUT _ COM end is connected to resistance RQ 2's the other end, MCU's twenty first pin OUT1 end is connected to opto-coupler OP 1's second pin, field effect pipe TQ 1's grid, electric capacity C5's one end is connected respectively to opto-coupler OP 1's third pin, field effect pipe TQ 1's source, electric capacity C5's the other end all ground connection, power relay JDQ 2's first pin, diode D3's positive pole are connected respectively to field effect pipe TQ 1's drain electrode, field effect pipe TQ 1's fourth pin connecting resistance R16's one end, resistance R16's the other end, diode D3's negative pole, power relay JDQ 2's second pin VCC 2 voltage VCC relay JDQ2 connects the third pin KC2 pin connector KC2 connection power connector.

The technical scheme is used for temperature abnormity alarm, when the collected temperature signal exceeds the set alarm value, the temperature abnormity alarm can be triggered, and the temperature abnormity alarm can inform monitoring personnel to carry out alarm processing so as to protect the normal operation of equipment.

The utility model is further arranged that the human-computer interaction module comprises a connector HJ3, a connector HJ4, a liquid crystal display LCD1 and a temperature warning circuit, wherein the temperature warning circuit comprises a driving chip UP1, light emitting diodes LED 1-LED 8, resistors R6-R7 and capacitors CR 2-CR 3, the model of the driving chip UP1 is TM1651, the first pin SDA end, the second pin SCLK end, the third pin RS end, the fourth pin RES end, the fifth pin CS end, the sixth pin IIC _ SLK end and the seventh pin IICSDA end of the connector HJ3 are respectively connected with the output end of the MCU, the eighth pin of the connector HJ3 is grounded, the ninth pin and the tenth pin of the connector HJ3 are respectively connected with high level, the first pin SDA end, the second pin SCLK end, the third pin RS end, the fourth pin RES end and the fifth pin CS end of the connector HJ4 are respectively connected with the input end of the liquid crystal display LCD1, the sixth pin IIC _ SLK end and the seventh pin IICSDA end of the connector HJ4 are respectively connected with the input end of a driving chip UP1, the eighth pin of the connector HJ4 is grounded, the ninth pin and the tenth pin of the connector HJ4 are respectively connected with a high level, the second pin LED1 end of the driving chip UP1 is respectively connected with the cathode of a light-emitting diode LED1 and the cathode of a light-emitting diode LED8, the third pin LED2 end of the driving chip UP1 is connected with the cathode of a light-emitting diode LED2, the fourth pin LED3 end of the driving chip UP1 is connected with the cathode of a light-emitting diode LED3, the fifth pin LED4 end of the driving chip UP1 is connected with the cathode of the light-emitting diode LED4, the sixth pin LED5 end of the driving chip UP1 is connected with the cathode of the light-emitting diode LED5, the seventh pin LED6 end of the driving chip UP1 is connected with the cathode of the light-emitting diode LED6, and the eighth pin LED7 end of the driving chip UP1 is connected with the cathode of the light-emitting diode LED7, the positive electrode of the light emitting diode LED1, the positive electrode of the light emitting diode LED2, the positive electrode of the light emitting diode LED3, the positive electrode of the light emitting diode LED4, the positive electrode of the light emitting diode LED5, the positive electrode of the light emitting diode LED6 and the positive electrode of the light emitting diode LED7 are all connected with the twelfth pin DIG1 end of the driving chip UP1, the positive electrode of the light emitting diode LDE8 is connected with the eleventh pin DIG2 end of the driving chip UP1, one end of the resistor R6 and one end of the resistor R7 are both connected with a high level, the other end of the resistor R6 is connected with one end of the capacitor CR3, the other end of the resistor R7 is connected with one end of the capacitor CR2, the other ends of the capacitor CR2 and the capacitor CR3 are all grounded, the other end of the resistor R6 is connected with the fourteenth pin IICSDA end of the driving chip UP1, and the other end of the resistor R7 is connected with the fifteenth pin IIC _ SLK end of the driving chip 1.

The utility model discloses further set UP to human-computer interaction module still including keying circuit, keying circuit includes key switch SW1 ~ SW3, key switch SW 1's first pin and second pin are connected respectively to drive chip UP 1's second pin LED1 end, key switch SW 3's first pin and second pin are connected respectively to drive chip UP 1's third pin LED2 end, key switch SW 2's first pin and second pin are connected respectively to drive chip UP 1's fourth pin LED3 end, key switch SW 1's third pin and fourth pin, key switch SW 3's third pin and fourth pin, key switch SW 2's third pin and fourth pin all connect drive chip UP 1's sixteenth pin K1 end.

The technical scheme has the function of information interaction, and can realize temperature warning of the temperature warning lamp, function adjustment of the function setting button and temperature display of the temperature display screen.

The utility model discloses the model that sets up as the external storage module is FM24W128.

The technical scheme has a nonvolatile function, and can still store data after power failure.

This practicality further sets up to communication module adopts RS485 communication.

The technical scheme adopts RS485 communication, the communication has the advantages of long distance, low power consumption and interference resistance, and the device can be used for communication between sensors or between the sensors and a terminal to realize inquiry and monitoring of temperature data.

Drawings

Fig. 1 is a schematic block diagram of a circuit according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view of the temperature monitoring sensor of the present invention.

Fig. 3 is a schematic circuit diagram of a temperature acquisition module according to an embodiment of the present invention.

Fig. 4 is a schematic circuit diagram of a voltage stabilizing module according to an embodiment of the present invention.

Fig. 5 is a schematic circuit diagram of an abnormal temperature alarm module according to an embodiment of the present invention.

Fig. 6 is a schematic circuit diagram of a human-computer interaction module according to an embodiment of the present invention.

Fig. 7 is a schematic circuit diagram of an external memory module according to an embodiment of the present invention.

Fig. 8 is a schematic circuit diagram of a communication module according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of the MCU circuit according to the embodiment of the present invention.

Detailed Description

As shown in fig. 1-9, the embodiment of the utility model provides a low voltage electric network temperature monitoring sensor has been adopted, which comprises a housin 1, the circuit board 6 of setting in casing 1, the hot junction temperature collection thermocouple 2 of setting in casing 1 one end, the power input wire 3 of setting in hot junction temperature collection thermocouple 2 one side, the cold junction temperature collection thermocouple 4 of setting at the casing 1 other end, the temperature monitoring alarm signal output wire 5 of setting in cold junction temperature collection thermocouple 4 one side, circuit board 6 includes MCU7, man-machine interaction module 11, temperature anomaly alarm module 10, temperature collection module 8, voltage stabilizing module 9, outside storage module 12, communication module 13, power module 14, temperature collection module 8's output, MCU 7's input is connected respectively to voltage stabilizing module 9's output, the input of temperature anomaly alarm module 10 is connected to MCU 7's output, man-machine interaction module 11, outside storage module 12, communication module 13 is connected with MCU7 electricity respectively, power module 14 is MCU7 respectively, temperature anomaly alarm module 10, temperature collection module 8, voltage stabilizing module 9, outside storage module 13 provides working voltage storage module 12, communication module 13 sets up four ways of working voltage collection thermocouple 24 sets up the temperature collection for the model of HC 13, the model of communication module 13 is set up the model of HC collection for the FM 13, the model of communication module 13, the model of the FM 13 is adopted the FM24W 35.

As shown in fig. 2, the sensor is still including temperature display screen 15, temperature warning light 16, function setting button 17, buckle 18, screw hole 19, temperature display screen 15 sets up on casing 1, temperature warning light 16 sets up the lower extreme at temperature display screen 15, function setting button 17 sets up the lower extreme at temperature warning light 16, buckle 18 sets up1 one side at the casing, screw hole 19 sets up the one side at power input wire 3 respectively, one side of temperature monitoring alarm signal output wire 5, temperature warning light 16 is eight settings, function setting button 17 is three setting.

As shown in fig. 3, the temperature acquisition module 8 mainly includes connectors JY1, JY2, and a temperature acquisition circuit, where the temperature acquisition circuit includes resistors RN1 to RN8, capacitors CN1 to CN8, a resistor RN1 serially connected with a capacitor CN1, a resistor RN2 serially connected with a capacitor CN2, a resistor RN3 serially connected with a capacitor CN3, a resistor RN4 serially connected with a capacitor CN4, a resistor RN5 serially connected with a capacitor CN5, a resistor RN6 serially connected with a capacitor CN6, a resistor RN7 serially connected with a capacitor CN7, a resistor RN8 serially connected with a capacitor CN8, one end of the resistor RN1, one end of the resistor RN2, one end of the resistor RN3, one end of the resistor RN4, and one end of the resistor RN4 are respectively connected to the output end of the connectors JY1, one end of the resistor RN5, one end of the resistor RN6, one end of the resistor RN7, one end of the resistor RN8 are respectively connected to the output end of the connectors JY2, the other end of the resistor RN1, the other end of the resistor RN2, the other end of the resistor RN3, the other end of the resistor RN4, the other end of the capacitor CN4, one end of the capacitor CN4, and one end of the capacitor CN8 are respectively connected to the ground.

As shown in fig. 4, the voltage stabilizing module 9 mainly includes a first-stage voltage stabilizing circuit and a second-stage voltage stabilizing circuit, the first-stage voltage stabilizing circuit includes a three-terminal regulator UD2, an electrolytic capacitor CE4 and a capacitor CD4, a third pin VIN end of the three-terminal regulator UD2 inputs a power supply voltage VCC, a second pin VOUT end of the three-terminal regulator UD2 is respectively connected to an anode of the electrolytic capacitor CE4, one end of the capacitor CD4, a first pin GND end of the three-terminal regulator UD2, a cathode of the electrolytic capacitor CE4 and the other end of the capacitor CD4 are all grounded, the second pin VOUT end of the three-terminal regulator UD2 outputs a midpoint voltage +5VC to the second-stage voltage stabilizing circuit, the second-stage voltage stabilizing circuit includes a three-terminal regulator UD3, an electrolytic capacitor CE5, a capacitor CD10 and an inductor L2, a third pin VIN end of the three-terminal regulator UD3 inputs a midpoint voltage +5VC, a second pin VOUT end of the three-terminal regulator UD3 is respectively connected to an anode of the electrolytic capacitor CE5, one end of the capacitor CD5, one end of the inductor L2, a high level, the other end of the three-terminal regulator UD2 is connected to one end of the capacitor CD10, a cathode of the capacitor CD5 and the other end of the capacitor CD5 is all grounded.

As shown in fig. 5 and 9, the temperature anomaly alarm module 10 mainly comprises a connector JY4 and a temperature anomaly alarm circuit, the temperature anomaly alarm circuit comprises a resistor RQ2, a resistor R16, a diode D3, a capacitor C5, an optocoupler OP1, a field effect transistor TQ1 and a power relay JDQ2, the first pin of the optocoupler OP1 is connected with one end of the resistor RQ2, the other end of the resistor RQ2 is connected with the twentieth pin OUT _ COM end of the MCU, the second pin of the optocoupler OP1 is connected with the twenty-first pin OUT1 end of the MCU, the third pin of the optocoupler OP1 is connected with the gate of the field effect transistor TQ1 and one end of the capacitor C5, the source of the field effect transistor TQ1 and the other end of the capacitor C5 are all grounded, the drain of the field effect transistor TQ1 is connected with the first pin of the power relay JDQ2 and the anode of the diode D3, the fourth pin of the optocoupler OP1 is connected with one end of the resistor R16, the other end of the resistor R16, the cathode of the diode D3 and the second pin of the power relay JDQ2 are all connected with the voltage VCC, and the connector JY4 of the third pin of the power relay jq 2 is connected with the fourth pin KC 2.

As shown in fig. 6 and 9, the human-computer interaction module 11 mainly comprises a connector HJ3, a connector HJ4, a liquid crystal display LCD1, and a temperature warning circuit, wherein the temperature warning circuit includes a driving chip UP1, LEDs 1 to 8, resistors R6 to R7, and capacitors CR2 to CR3, the model of the driving chip UP1 is TM1651, the first pin SDA, the second pin SCLK, the third pin RS, the fourth pin RES, the fifth pin CS, the sixth pin IIC _ SLK, and the seventh pin IICSDA of the connector HJ3 are respectively connected to the output terminal of the MCU, the eighth pin of the connector HJ3 is grounded, the ninth pin and the tenth pin of the connector HJ3 are respectively connected to the high level, the first pin SDA, the second pin SCLK, the third pin RS, the fourth pin RES, and the fifth pin CS of the connector HJ4 are respectively connected to the input terminal of the liquid crystal display LCD1, the sixth pin IIC _ SLK end and the seventh pin IICSDA end of the connector HJ4 are respectively connected with the input end of the driving chip UP1, the eighth pin of the connector HJ4 is grounded, the ninth pin and the tenth pin of the connector HJ4 are respectively connected with a high level, the second pin LED1 end of the driving chip UP1 is respectively connected with the cathode of the light emitting diode LED1 and the cathode of the light emitting diode LED8, the third pin LED2 end of the driving chip UP1 is connected with the cathode of the light emitting diode LED2, the fourth pin LED3 end of the driving chip UP1 is connected with the cathode of the light emitting diode LED3, the fifth pin LED4 end of the driving chip UP1 is connected with the cathode of the light emitting diode LED4, the sixth pin LED5 end of the driving chip UP1 is connected with the cathode of the light emitting diode LED5, the seventh pin LED6 end of the driving chip UP1 is connected with the cathode of the light emitting diode LED6, the eighth pin LED7 end of the driving chip UP1 is connected with the cathode of the light emitting diode LED7, the anode of the light emitting diode LED1 and the anode of the light emitting diode LED2, the anode of the light emitting diode LED3, the anode of the light emitting diode LED4, the anode of the light emitting diode LED5, the anode of the light emitting diode LED6, and the anode of the light emitting diode LED7 are all connected to the twelfth pin DIG1 of the driving chip UP1, the anode of the light emitting diode LDE8 is connected to the eleventh pin DIG2 of the driving chip UP1, one end of the resistor R6 and one end of the resistor R7 are both connected to a high level, the other end of the resistor R6 is connected to one end of the capacitor CR3, the other end of the resistor R7 is connected to one end of the capacitor CR2, the other end of the capacitor CR2 and the other end of the capacitor CR3 are both grounded, the other end of the resistor R6 is connected to the fourteenth pin IICSDA of the driving chip UP1, and the other end of the resistor R7 is connected to the fifteenth pin IIC _ SLK of the driving chip UP 1.

The man-machine interaction module 11 further comprises a key circuit, the key circuit comprises key switches SW 1-SW 3, the end of a second pin LED1 of the driving chip UP1 is respectively connected with a first pin and a second pin of the key switch SW1, the end of a third pin LED2 of the driving chip UP1 is respectively connected with a first pin and a second pin of the key switch SW3, the end of a fourth pin LED3 of the driving chip UP1 is respectively connected with a first pin and a second pin of the key switch SW2, the third pin and the fourth pin of the key switch SW1, the third pin and the fourth pin of the key switch SW3, and the third pin and the fourth pin of the key switch SW2 are both connected with the end of a sixteenth pin K1 of the driving chip UP 1.

In addition to the above embodiments, there are also other embodiments of the present invention, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and scope of the present invention, and those changes and modifications are equivalent to the technical solutions in the present patent, and then those corresponding changes and modifications are all within the scope of the appended claims.

Claims

1. A low-voltage power grid temperature monitoring sensor is characterized in that: the temperature monitoring and alarming device comprises a shell, a circuit board arranged in the shell, a hot-end temperature acquisition thermocouple arranged at one end of the shell, a power input lead arranged at one side of the hot-end temperature acquisition thermocouple, a cold-end temperature acquisition thermocouple arranged at the other end of the shell, and a temperature monitoring and alarming signal output lead arranged at one side of the cold-end temperature acquisition thermocouple, wherein the circuit board comprises an MCU (microprogrammed control unit), a human-computer interaction module, a temperature abnormity alarming module, a temperature acquisition module, a voltage stabilizing module, an external storage module, a communication module and a power module, the output end of the temperature acquisition module and the output end of the voltage stabilizing module are respectively connected with the input end of the MCU, the output end of the MCU is connected with the input end of the temperature abnormity alarming module, the human-computer interaction module, the external storage module and the communication module are respectively and electrically connected with the MCU, and the power module respectively provides working voltage for the MCU, the human-computer interaction module, the temperature abnormity alarming module, the temperature acquisition module, the voltage stabilizing module, the external storage module and the communication module.

2. The low-voltage power grid temperature monitoring sensor according to claim 1, wherein: the sensor is still including temperature display screen, temperature warning light, function settlement button, buckle, screw hole, the temperature display screen sets up on the casing, the temperature warning light sets up the lower extreme at the temperature display screen, the function settlement button sets up the lower extreme at the temperature warning light, the buckle sets up the one side at the casing, the screw hole sets up the one side at one side of power input wire, one side of temperature monitoring alarm signal output wire respectively.

3. The low-voltage power grid temperature monitoring sensor according to claim 1, wherein: the temperature acquisition module comprises connector JY1, connector JY2 and a temperature acquisition circuit, the temperature acquisition circuit comprises resistors RN 1-RN 8 and capacitors CN 1-CN 8, the resistor RN1 is connected with the capacitor CN1 in series, the resistor RN2 is connected with the capacitor CN2 in series, the resistor RN3 is connected with the capacitor CN3 in series, the resistor RN4 is connected with the capacitor CN4 in series, the resistor RN5 is connected with the capacitor CN5 in series, the resistor RN6 is connected with the capacitor CN6 in series, the resistor RN7 is connected with the capacitor CN7 in series, the resistor RN8 is connected with the capacitor CN8 in series, one end of the resistor RN1, one end of the resistor RN2, one end of the resistor RN3 and one end of the resistor RN4 are respectively connected with the output end of the connector JY1, one end of the resistor RN6, one end of the resistor RN7 and one end of the resistor RN8 are respectively connected with the output end of the connector JY2, the other end of the resistor RN1, the other end of the resistor RN2, the other end of the resistor RN3, the other end of the resistor RN4, the other end of the resistor RN5, the other end of the resistor RN6, the other end of the resistor RN7, the other end of the resistor RN8, one end of the capacitor CN8 are respectively connected with the capacitor CN4, one end of the capacitor CN4 and the one end of the capacitor CN4 of the CN1 and the CN7 are all connected with the high level of the capacitor CN4, the capacitor CN4 of the capacitor CN 4.

4. The low-voltage power grid temperature monitoring sensor according to claim 1 or 3, characterized in that: the voltage stabilizing module comprises a primary voltage stabilizing circuit and a secondary voltage stabilizing circuit, the primary voltage stabilizing circuit comprises a three-terminal voltage stabilizer UD2, an electrolytic capacitor CE4 and a capacitor CD4, a power supply voltage VCC is input to a third pin VIN end of the three-terminal voltage stabilizer UD2, a second pin VOUT end of the three-terminal voltage stabilizer UD2 is connected with an anode of the electrolytic capacitor CE4 and one end of the capacitor CD4 respectively, a GND end of a first pin of the three-terminal voltage stabilizer UD2, a cathode of the electrolytic capacitor CE4 and the other end of the capacitor CD4 are grounded, a midpoint voltage +5VC is output to the secondary voltage stabilizing circuit from a second pin VOUT end of the three-terminal voltage stabilizer UD2, the secondary voltage stabilizing circuit comprises a three-terminal voltage stabilizer UD3, an electrolytic capacitor CE5, a capacitor CD10 and an inductor L2, a midpoint voltage +5VC is input to the third pin UD end of the three-terminal voltage stabilizer UD3, a second pin VOUT end of the three-terminal voltage stabilizer UD3 is connected with an anode of the electrolytic capacitor CE5, one end of the capacitor CD5, one end of the inductor L2 and a high level, the other end of the three-terminal voltage stabilizing circuit is connected with one end of the capacitor CD 2, the other end of the capacitor CD5 is connected with an AC high level CD10, and the other end of the capacitor CD5 and the capacitor GND terminal of the capacitor CE 2, the other end of the capacitor CD 5.

5. The low-voltage power grid temperature monitoring sensor according to claim 1 or 3, characterized in that: the temperature anomaly alarm module comprises a connector JY4 and a temperature anomaly alarm circuit, the temperature anomaly alarm circuit comprises a resistor RQ2, a resistor R16, a diode D3, a capacitor C5, an optocoupler OP1, a field effect tube TQ1 and a power relay JDQ2, the first pin of the optocoupler OP1 is connected with one end of the resistor RQ2, the other end of the resistor RQ2 is connected with a twentieth pin OUT _ COM end of the MCU, the second pin of the optocoupler OP1 is connected with a twenty-first pin OUT1 end of the MCU, the third pin of the optocoupler OP1 is connected with a grid of the field effect tube TQ1 and one end of the capacitor C5 respectively, the source electrode of the field effect tube TQ1 and the other end of the capacitor C5 are grounded, the drain electrode of the field effect tube TQ1 is connected with the first pin of the power relay JDQ2 and the anode of the diode D3 respectively, the fourth pin of the optocoupler OP1 is connected with one end of the resistor R16, the other end of the resistor R16, the cathode of the diode D3 and the second pin of the power relay JDQ2 are connected with a power supply voltage VCC, and the third pin of the power relay JDQ2 is connected with the connector of the second pin of the KC2, and the third pin of the connector is connected with the second pin of the second pin JDQ 2.

6. The low-voltage power grid temperature monitoring sensor according to claim 1 or 3, characterized in that: the man-machine interaction module comprises a connector HJ3, a connector HJ4, a liquid crystal display LCD1 and a temperature warning circuit, wherein the temperature warning circuit comprises a driving chip UP1, light Emitting Diodes (LEDs) 1-LED 8, resistors R6-R7 and capacitors CR 2-CR 3, the type of the driving chip UP1 is TM1651, the type of the first pin SDA end, the type of the second pin SCLK end, the type of the third pin RS end, the type of the fourth pin RES end, the type of the fifth pin CS end, the type of the sixth pin IIC _ SLK end and the type of the seventh pin IICSDA end of the connector HJ3 are respectively connected with the output end of the MCU, the eighth pin of the connector HJ3 is grounded, the type of the ninth pin and the type of the tenth pin of the connector HJ3 are respectively connected with a high level, the type of the first pin UP, the type of the second pin SCLK end, the type of the pin IIC _ SLK end and the type of the seventh pin IIC _ CSDA end of the connector HJ4 are respectively connected with the input end of the liquid crystal display LCD1, the type of the LED chip 5, the type of the LED chip is connected with the type of the LED chip 5, the type of the fifth pin HJ4 and the type of the LED chip 5, the positive electrode of the light emitting diode LED1, the positive electrode of the light emitting diode LED2, the positive electrode of the light emitting diode LED3, the positive electrode of the light emitting diode LED4, the positive electrode of the light emitting diode LED5, the positive electrode of the light emitting diode LED6 and the positive electrode of the light emitting diode LED7 are all connected with the twelfth pin DIG1 end of the drive chip UP1, the positive electrode of the light emitting diode LDE8 is connected with the eleventh pin DIG2 end of the drive chip UP1, one end of the resistor R6 and one end of the resistor R7 are both connected with a high level, the other end of the resistor R6 is connected with one end of the capacitor CR3, the other end of the resistor R7 is connected with one end of the capacitor CR2, the other ends of the capacitor CR2 and the capacitor CR3 are both grounded, the other end of the resistor R6 is connected with the fourteenth pin IICSDA end of the drive chip UP1, and the other end of the resistor R7 is connected with the fifteenth pin IIC _ SLK end of the drive chip UP 1.

7. The low-voltage power grid temperature monitoring sensor of claim 6, wherein: the man-machine interaction module further comprises a key circuit, wherein the key circuit comprises key switches SW 1-SW 3, the end of a second pin LED1 of the drive chip UP1 is respectively connected with a first pin and a second pin of the key switch SW1, the end of a third pin LED2 of the drive chip UP1 is respectively connected with a first pin and a second pin of the key switch SW3, the end of a fourth pin LED3 of the drive chip UP1 is respectively connected with a first pin and a second pin of the key switch SW2, and the third pin and the fourth pin of the key switch SW1, the third pin and the fourth pin of the key switch SW3, and the third pin and the fourth pin of the key switch SW2 are all connected with the end of a sixteenth pin K1 of the drive chip UP 1.

8. The low-voltage power grid temperature monitoring sensor according to claim 1 or 3, characterized in that: the model of the external storage module is FM24W128.

9. The low voltage power grid temperature monitoring sensor according to claim 1 or 3, wherein: and the communication module adopts RS485 communication.

10. The low voltage power grid temperature monitoring sensor according to claim 1 or 3, wherein: the model of the MCU is HC32L136J8TA.