CN211783946U - Temperature acquisition device and electric energy meter - Google Patents
Temperature acquisition device and electric energy meter Download PDFInfo
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- CN211783946U CN211783946U CN202020101574.9U CN202020101574U CN211783946U CN 211783946 U CN211783946 U CN 211783946U CN 202020101574 U CN202020101574 U CN 202020101574U CN 211783946 U CN211783946 U CN 211783946U
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- thermistor
- electric energy
- energy meter
- temperature
- temperature acquisition
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Abstract
The utility model relates to a temperature acquisition device, its characterized in that: the thermal resistor comprises a thermal resistor (1) and an isolating layer (2) which is wrapped on the outer side of the thermal resistor (1) and made of an insulating heat conduction material, wherein two pins (4) of the thermal resistor (1) are exposed out of the isolating layer (2). Also discloses an electric energy meter using the temperature acquisition device for temperature detection. The utility model has the advantages that: through the isolation layer of being made by insulating heat conduction material in thermistor's outside parcel, make this temperature acquisition device have the effect of electric isolation and heat conduction, consequently can effectively avoid the electric conduction between live wire terminal and the zero line terminal with this temperature acquisition device when detecting live wire terminal and the zero line terminal of electric energy meter simultaneously, and can carry out temperature detection to every live wire terminal and zero line terminal alone to can effectively avoid the electric energy meter the high-temperature condition of burning out that causes to appear.
Description
Technical Field
The utility model relates to a temperature acquisition field, in particular to temperature acquisition device and electric energy meter.
Background
At present, in the field operation process of an electric energy meter, because of insecure wiring of a fire wire terminal and a zero line terminal or nonstandard use of terminal materials, under the conditions of large current and long-time operation, the wiring terminal of the electric energy meter can generate heat, the electric energy meter can be burnt in serious conditions, and safety accidents such as fire disasters and personal injuries are caused. Therefore, it is necessary to add a temperature detection function to the electric energy meter so as to automatically control the tripping of the relay.
The traditional way is directly pasted on binding post's copper post with the temperature sensing chip in the trade at present, and rethread electric energy meter in the singlechip carries out the sampling calculation, only can detect the temperature with the electric terminal that connects of singlechip equipotential (the present scheme only surveys the live wire terminal), because the voltage on the live wire terminal of electric energy meter and the zero line terminal is very high, if detect two terminals simultaneously, lead to withstand voltage must be greater than more than 500V between two detection ports of singlechip, so can't measure the temperature of the live wire terminal and the zero line terminal of electric energy meter simultaneously.
Chinese patent application No. CN201910602595.0 (application publication No. CN110207857A) discloses a calibration device and a calibration method for temperature detection of electric energy meter electric connection terminals, which includes a controller, the controller is connected with the electric energy meter through a wireless communication module or a cable, the electric energy meter is provided with a plurality of connection terminals, each connection terminal is provided with a metal contact, each connection terminal is provided with a temperature sensor, the temperature detection calibration device further includes a terminal base connected with the controller through a cable, the terminal base is connected with a plurality of binding posts, one binding post is correspondingly connected with one connection terminal, each binding post includes a metal shell, the metal shell is provided with a temperature sensor and a heating device, and the end of the metal shell is provided with a connection contact contacted with the metal contact. The calibration device can be used for accurately testing whether the temperature detection of the wiring terminal of the electric energy meter is accurate, so that the temperature measurement of the wiring terminal is more accurate and reliable. However, since each terminal is provided with a temperature sensor for detection, when a cable is used for connection, the metal contacts are conductors, and therefore, the terminals having a phase voltage higher than the withstand voltage of the controller cannot be detected at the same time, and only the temperature of the terminal having the same potential as the controller can be detected. Further improvements are therefore desirable.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the first technical problem that will solve is to prior art's current situation, provides a temperature acquisition device that has electrical isolation and heat conductivility is strong.
The utility model discloses the second technical problem that will solve is to prior art's current situation, provides an electric energy meter that adopts above-mentioned temperature acquisition device to carry out live wire terminal and zero line terminal temperature detection.
The utility model provides a technical scheme that above-mentioned first technical problem adopted does: a temperature acquisition device, its characterized in that: the thermistor comprises a thermistor and an isolating layer which is wrapped on the outer side of the thermistor and made of insulating heat conducting materials, wherein two pins of the thermistor are exposed out of the isolating layer.
In order to ensure the accuracy of temperature acquisition of the thermistor, a heat conduction layer is also arranged between the isolation layer and the thermistor.
In order to prevent the continuous welding during welding, the distance between the two pins of the thermistor exposed out of the isolating layer is more than or equal to 2.54 mm.
Preferably, the thermistor is an NTC thermistor or a PTC thermistor.
The utility model provides a technical scheme that above-mentioned second technical problem adopted does: the utility model provides an electric energy meter, be equipped with microprocessor and relay in the electric energy meter, microprocessor is connected with the control end of relay, be equipped with live wire terminal and zero line terminal on the electric energy meter, live wire terminal or zero line terminal correspond respectively and are equipped with copper post, its characterized in that: still be equipped with the temperature acquisition circuit who is used for gathering live wire terminal or zero line terminal temperature in the electric energy meter, temperature acquisition circuit includes temperature acquisition device and divider resistance as above, temperature acquisition device part stretches into in the copper post that live wire terminal or zero line terminal correspond, be used for detecting temperature in live wire terminal or the zero line terminal, thermistor exposes in a pin of isolation layer and is connected with first power, and another pin is established ties mutually with divider resistance, divider resistance's other end ground connection, be connected with microprocessor between thermistor and divider resistance's the connecting wire.
Similarly, a heat conduction layer is also arranged between the isolation layer and the thermistor.
The distance between the two pins of the thermistor exposed out of the isolating layer is more than or equal to 2.54 mm.
In order to avoid short circuit fault caused by electrical performance reduction after high-temperature and high-humidity test, the distance between the root of the pin exposed out of the isolating layer of the thermistor and the temperature detection device exposed out of the copper column is more than or equal to 6 mm.
Preferably, the temperature drift resistance coefficient of the voltage dividing resistor is less than or equal to 25 ppm.
The thermistor is an NTC thermistor or a PTC thermistor.
Compared with the prior art, the utility model has the advantages of: through the isolation layer of being made by insulating heat conduction material in thermistor's outside parcel, make this temperature acquisition device have the effect of electric isolation and heat conduction, consequently with this temperature acquisition device can effectively avoid the electric conduction between live wire terminal and the zero line terminal when detecting the live wire terminal and the zero line terminal of electric energy meter simultaneously, and can carry out temperature detection to every live wire terminal and zero line terminal alone, when microprocessor detects any terminal high temperature that appears, then microprocessor can trip operation by real time control relay, thereby can effectively avoid the electric energy meter the high temperature and the condition of burning out that causes to appear. The circuit is simple and practical.
Drawings
Fig. 1 is a schematic structural diagram of a temperature acquisition device in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the embodiment of the present invention in which a temperature acquisition device is used to acquire the temperature of a live wire terminal or a neutral wire terminal;
fig. 3 is a circuit diagram of a temperature acquisition circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the operation in the electric energy meter according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1 and 2, a temperature acquisition device includes a thermistor 1 and an isolation layer 2 made of insulating heat conduction material and wrapped outside the thermistor 1, and two pins 4 of the thermistor 1 are exposed out of the isolation layer 2. Through wrapping up isolation layer 2 in thermistor 1 outside can effectively avoid this collection system and circuit to take place the accident that electric conduction and arouse.
In addition, a heat conduction layer 3 is arranged between the isolation layer 2 and the thermistor 1. This heat-conducting layer 3 is filled by the heat conduction material and forms, can give the thermistor 1 of locating in isolation layer 2 through heat-conducting layer 3 with the temperature transfer that detects to can guarantee temperature acquisition device's temperature acquisition accuracy.
In order to prevent the situation of continuous welding caused by the close distance between the two pins, the distance e between the two pins 4 of the thermistor 1 exposed out of the isolating layer 2 is more than or equal to 2.54 mm. In this embodiment, the distance e between the two leads 4 of the thermistor 1 exposed on the isolation layer 2 is 3 mm.
In the present embodiment, the thermistor 1 is an NTC thermistor or a PTC thermistor. The NTC thermistor is a thermistor with negative temperature coefficient, the resistance of which decreases exponentially along with the temperature rise; the PTC thermistor increases in resistance with an increase in temperature, and both of these thermistors can be used to detect temperature.
As shown in fig. 2 to 4, the temperature acquisition device is used for detecting the temperatures of the live wire terminal and the zero line terminal of the electric energy meter, and specifically comprises the following steps: the utility model provides an electric energy meter, be equipped with microprocessor and relay in the electric energy meter, microprocessor is connected with the control end of relay, be equipped with hot wire terminal and zero line terminal on the electric energy meter, hot wire terminal or zero line terminal correspond respectively and are equipped with copper post 5, still be equipped with the temperature acquisition circuit that is used for gathering hot wire terminal or zero line terminal temperature in the electric energy meter, temperature acquisition circuit includes foretell temperature acquisition device and divider resistance R1, temperature acquisition device part stretches into in hot wire terminal or zero line terminal's copper post 5, be used for detecting the temperature in hot wire terminal or the zero line terminal, thermistor 1 exposes in one pin of isolation layer 2 and is connected with first power VCC, another pin and divider resistance R1 are established ties, the other end ground connection of divider resistance R1, be connected with microprocessor between thermistor 1 and divider resistance R1's the connecting wire. The first power source VCC is a reference power source provided in the electric energy meter.
In the temperature acquisition circuit shown in fig. 3, the thermistor has an electrical reference RT, which represents the same thermistor as the thermistor 1, and a signal acquisition terminal is provided between the connecting line between the thermistor RT and the voltage divider R1, and is connected to the microprocessor. In this embodiment, the microprocessor is a single chip microcomputer.
Similarly, a heat conduction layer 3 is also arranged between the isolation layer 2 and the thermistor 1; the distance e between the two pins 4 of the thermistor 1 exposed out of the isolating layer 2 is greater than or equal to 2.54 mm.
In order to avoid the fault of the temperature acquisition device after high temperature and high humidity, the distance d between the root of the pin 4 of the thermistor 1 exposed out of the isolation layer 2 and the temperature detection device exposed out of the copper column 5 is larger than or equal to 6 mm. The temperature drift resistance coefficient of the voltage-dividing resistor R1 is less than or equal to 25 ppm. The thermistor 1 is an NTC thermistor or a PTC thermistor.
Meanwhile, for the convenience of connection in the electric energy meter, the circuits in the electric energy meter are generally concentrated on the PCB, so that the temperature acquisition circuit is arranged on the PCB in the electric energy meter, and when the temperature acquisition circuit is used, the thermistor 1 is exposed on the PCB containing the temperature acquisition circuit by welding two pins of the isolation layer 2.
When using, stretch into the electric energy meter in the copper post of live wire terminal or zero line terminal with the temperature acquisition device part, again respond to the temperature according to the temperature acquisition device who stretches into in every live wire terminal or the zero line terminal, thereby thermistor among every temperature acquisition circuit can change the resistance according to the temperature variation of response, microprocessor can be according to the voltage variation between thermistor and the divider resistor, thereby judge the temperature that thermistor corresponds, microprocessor then carries out real-time tripping operation control according to the temperature variation, consequently, through increasing the isolation layer to every temperature acquisition device, play the effect of electric isolation and heat conduction, this temperature acquisition device can carry out temperature detection to the binding post of arbitrary electric potential, thereby can guarantee to carry out the individual detection to the temperature of all live wire terminals and zero line terminal simultaneously.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A temperature acquisition device, its characterized in that: the thermal resistor comprises a thermal resistor (1) and an isolating layer (2) which is wrapped on the outer side of the thermal resistor (1) and made of an insulating heat conduction material, wherein two pins (4) of the thermal resistor (1) are exposed out of the isolating layer (2).
2. The temperature-sensing device of claim 1, wherein: and a heat conduction layer (3) is also arranged between the isolation layer (2) and the thermistor (1).
3. The temperature-sensing device of claim 1, wherein: the distance (e) between the two pins (4) of the thermistor (1) exposed out of the isolating layer (2) is more than or equal to 2.54 mm.
4. The temperature acquisition device according to any one of claims 1 to 3, wherein: the thermistor (1) is an NTC thermistor or a PTC thermistor.
5. The utility model provides an electric energy meter, be equipped with microprocessor and relay in the electric energy meter, microprocessor is connected with the control end of relay, be equipped with live wire terminal and zero line terminal on the electric energy meter, live wire terminal or zero line terminal correspond respectively and are equipped with copper post (5), its characterized in that: still be equipped with the temperature acquisition circuit that is used for gathering firewire terminal or zero line terminal temperature in the electric energy meter, temperature acquisition circuit includes temperature acquisition device and divider resistance (R1) according to claim 1, the temperature acquisition device part stretches into in copper post (5) that firewire terminal or zero line terminal correspond, is used for detecting temperature in firewire terminal or the zero line terminal, thermistor (1) expose and are connected with first power (VCC) in a pin of isolation layer (2), and another pin is established ties mutually with divider resistance (R1), the other end ground connection of divider resistance (R1), be connected with microprocessor between the connecting wire of thermistor (1) and divider resistance (R1).
6. The electric energy meter of claim 5, wherein: and a heat conduction layer (3) is also arranged between the isolation layer (2) and the thermistor (1).
7. The electric energy meter of claim 5, wherein: the distance (e) between the two pins (4) of the thermistor (1) exposed out of the isolating layer (2) is more than or equal to 2.54 mm.
8. The electric energy meter of claim 7, wherein: the distance (d) between the root of the pin (4) of the thermistor (1) exposed out of the isolating layer (2) and the temperature detection device exposed out of the copper column (5) is more than or equal to 6 mm.
9. The electric energy meter of claim 5, wherein: the temperature drift resistance coefficient of the voltage dividing resistor (R1) is less than or equal to 25 ppm.
10. An electric energy meter according to any one of claims 5 to 9, characterized in that: the thermistor (1) is an NTC thermistor or a PTC thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020101574.9U CN211783946U (en) | 2020-01-16 | 2020-01-16 | Temperature acquisition device and electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020101574.9U CN211783946U (en) | 2020-01-16 | 2020-01-16 | Temperature acquisition device and electric energy meter |
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| CN211783946U true CN211783946U (en) | 2020-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113483904A (en) * | 2021-07-22 | 2021-10-08 | 重庆跃腾电器有限公司 | Terminal temperature monitoring system of single-phase ammeter |
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- 2020-01-16 CN CN202020101574.9U patent/CN211783946U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113483904A (en) * | 2021-07-22 | 2021-10-08 | 重庆跃腾电器有限公司 | Terminal temperature monitoring system of single-phase ammeter |
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