CN111551286A - Passive wireless temperature detection device - Google Patents
Passive wireless temperature detection device Download PDFInfo
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- CN111551286A CN111551286A CN202010601848.5A CN202010601848A CN111551286A CN 111551286 A CN111551286 A CN 111551286A CN 202010601848 A CN202010601848 A CN 202010601848A CN 111551286 A CN111551286 A CN 111551286A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/223—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor characterised by the shape of the resistive element
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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Abstract
The application discloses a passive wireless temperature detection device, which comprises an explosion-proof blanket wrapped on the outer circumference of a cable joint, wherein an induction electricity taking unit and a grid temperature measuring unit are embedded in the explosion-proof blanket, and the induction electricity taking unit generates induction current through the current in a cable to supply power for an electric appliance box arranged on the outer circumference of the cable; the electric appliance box comprises a temperature correction circuit and a signal processing circuit which is connected with the temperature correction circuit and is used for converting an electric signal which is sensed by the grid temperature measurement unit and adjusted by the temperature correction circuit into a digital signal; the signal processing circuit is also connected with a communication module used for wirelessly transmitting the converted digital signal. Compared with the existing single temperature sensor, the monitoring covering surface of the invention is wider, no dead angle or blind area is left, and the temperature rise of any position in the cable joint can be monitored. The temperature change response is more accurate and sensitive, early warning is achieved, and secondary accidents are avoided.
Description
Technical Field
The invention relates to the field of cable safety monitoring devices, in particular to the field of temperature monitoring or detecting devices of high-voltage cable joints, and particularly relates to a passive wireless temperature detecting device.
Background
In the safe operation process of the power system, the fault of the cable intermediate joint cannot be pre-judged in advance, and the judgment can be carried out through step-by-step searching only when the fault causes the tripping of a substation circuit. And the cable intermediate connection fault causes the cable burning short circuit tripping in the same channel or the same cable well, and the like, thereby causing the fault range to be enlarged. After a fault occurs, the fault needs to be searched by a cable fault tester, and the fault point judgment and search time is long, so that the accident processing time is long, and the safe and stable operation of a power grid is influenced.
Once the cable has an intermediate joint fault, the generated destructive force can not only cause the outage of the line, but also can cause damage to peripheral running cable lines, power facilities and personnel, and even can cause secondary accidents.
At present, the following cable joint temperature detection technologies are mainly used in China and abroad.
1. Thermistor formula temperature measurement system. The temperature value can be displayed in time, but because of the connection problem, each thermistor needs to be wired independently, and is more complex, but the characteristics that the thermistor is easy to damage, and the maintenance work required is more. The sensor can not be subjected to self-checking treatment, and all the sensors often need manual operation to check the temperature sensor.
2. Cable temperature sensing formula temperature measurement system. The temperature sensing cable and the cable are arranged in parallel, and when the temperature of the cable is higher than a set value, a signal for alarming is sent. The common temperature sensing cable with the defects of damage, fixed alarm temperature, incomplete fault signals and the like in alarm causes the installation process of the system to be complicated, and workers have large workload on the maintenance, equipment still needs to be maintained and updated frequently, and the measurement and trend analysis of the temperature of a cable joint cannot be completed.
3. Ion induction temperature measurement system. The temperature measuring system mainly depends on a relatively advanced communication technology, a microprocessor technology using signal processing, a digital technology of a temperature sensor and an ion sensing technology, can continuously monitor temperature data at a cable joint in real time, enables a power joint fault to be predicted, displays the current temperature of a cable through an interface simulated by an upper computer, displays the actual position and other relevant parameter information such as the cable model and the like monitored through remote sensing, alarms and automatically displays the actual position on a screen when the cable is abnormal in operation, and determines the actual position of the fault through the upper computer.
4. The infrared temperature measurement is a non-contact temperature measurement mode, so that the infrared temperature measurement is sensitive to the influence of the surrounding environment and an electromagnetic field and cannot meet the required accuracy.
5. The fiber grating sensing technology has the characteristics of higher safety, stronger electromagnetic interference resistance and small submission, has been paid high attention by countries such as Japan, America and the like, and China also invests a large amount of manpower and financial resources to apply the new measuring technology.
Based on the current monitoring situation in the prior art, it is necessary to provide a passive and wireless device capable of adapting to various cable joint monitoring, and monitoring the temperature of the cable joint in real time.
Disclosure of Invention
In order to solve drawback and the problem that prior art mentioned among the background art exists, this application provides a passive wireless temperature-detecting device, has evaded the drawback that has the blind area to the cable joint temperature measurement in prior art from temperature measurement structure and principle, changes some temperature acquisition into face temperature acquisition, carries out 360 degrees including the monitoring to the cable joint, avoids monitoring the blind area for the monitoring is more accurate. And secondly, data communication can be carried out with a background server in real time through a communication module, once the temperature of the cable intermediate joint is abnormal, the background monitoring can timely remind the pipe transportation personnel through the conventional prompting modes such as alarming, mobile phone short messages and the like, intervention is predicted in advance, prevention and control measures are timely taken, so that the cable intermediate joint is prevented from breaking through a critical point and then breaking down, and the probability of failure occurrence is reduced.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
a passive wireless temperature detection device comprises an explosion-proof blanket wrapped on the outer circumference of a cable joint, wherein an induction electricity taking unit and a grid temperature measuring unit are embedded in the explosion-proof blanket, and the induction electricity taking unit generates induction current through current in a cable to supply power to an electric box arranged on the outer circumference of the cable; the electric appliance box is internally provided with a temperature correction circuit electrically connected with the grid temperature measuring unit and a signal processing circuit which is connected with the temperature correction circuit and is used for converting an electric signal sensed by the grid temperature measuring unit and adjusted by the temperature correction circuit into a digital signal; the signal processing circuit is also connected with a communication module used for wirelessly transmitting the converted digital signal.
The working principle is as follows: in actual work, because alternating current passes through the cable, countless magnetic induction lines can be generated in the circumferential direction of the cable, the reaction electricity taking units arranged on the outer circumference of the cable generate induced current in the magnetic induction lines densely distributed around the cable, and the generated induced current is used as a power supply of the electric box, so that the electric box can always keep a working state in the process of cable power transmission, a temperature correction circuit in the electric box acquires the temperature of the cable joint through a grid temperature measuring unit tightly attached to the outer side of the cable joint, and finally, the collected temperature information is sent to a communication module through a signal processing circuit, the communication module sends the information to a background server according to a preset rule, and a power supply network maintenance worker can master the working condition of the cable joint in the whole power grid. In the process, because the grid temperature measuring units are made of different materials and have different temperature sensitivities, the resistance value changes along with the change of the temperature in the process of changing along with the temperature, and the set purpose of the temperature correcting circuit is used for carrying out conversion and objective reflection through the sensing of the grid temperature measuring units on the temperature; the specific principle is as follows: the temperature of the cable joint is continuously increased, the internal resistance of the grid temperature measuring unit is changed due to the temperature change, the current passing through the grid temperature measuring unit is changed, and objective reaction to the temperature change is realized through the change of the current.
The beneficial effects of adopting above-mentioned mode to realize the real-time supervision to cable joint temperature lie in: the grid temperature measuring unit is completely different from the existing single temperature sensor, the coverage surface of the grid temperature measuring unit is wider than that of the existing single temperature sensor, the whole cable connector can be completely covered, dead angles and blind areas are not reserved, and the temperature rise of the cable connector caused by looseness or poor contact or any other possible reasons at any position in the cable connector can be monitored. Any covered cable joint area temperature rise can be intuitively reflected, and the problem that a single temperature sensor can only monitor the temperature of one or more point coordinates or one or more relatively concentrated local points, so that objective blind areas and areas are missed to monitor, and further detection data distortion or alarm delay is caused is solved. Compared with the existing single temperature sensor, the scheme of the application is more accurate and sensitive to temperature reaction.
As the preferable technical scheme, the explosion-proof blanket is made of an insulating composite material containing high-temperature-resistant ceramic particles and quartz particles, the induction electricity taking unit comprises an induction coil, and the axial direction of the induction coil is parallel to or perpendicular to the axial direction of the cable. The explosion-proof blanket is made of the insulating composite material, has the advantages of good insulating property and low hardness, is beneficial to wrapping cable connectors of any shape and size, ensures that the explosion-proof blanket has high attaching degree to the surfaces of the cable connectors, does not generate virtual position oxidation, can ensure that the grid temperature measuring unit embedded in the explosion-proof blanket is more attached to the surfaces of the cable connectors, can more quickly sense the temperature change of the cable connectors, and thus indirectly improves the temperature sensitivity of the temperature-sensitive cable connector. The purpose of adding high temperature resistant ceramic granule and quartz granule in insulating combined material is the high temperature resistance ability that further improves explosion-proof blanket, make cable joint surface and insulating combined material's contact surface littleer, when cable joint takes place high temperature or catches fire because of the unexpected condition, under the continuous effect of high temperature, the ceramic granule and the quartz granule of bulk density can form the high temperature resistant flame retardant coating of one deck under the insulating combined material's that melts parcel, the inside oxygen of isolated cable joint simultaneously, make the intensity of a fire can not stretch or slow down the speed of stretching greatly.
Preferably, the induction electricity taking unit comprises one or more groups of induction coils, and a magnetic gathering armature is installed in the axial inner diameter of any group of induction coils. The magnetic gathering armature can enable the induction coil to obtain more induction current, and the actual effect of electromagnetic induction is improved.
Preferably, the grid temperature measuring unit is a thermistor wire embedded in one side of the explosion-proof blanket close to the cable. The thermistor wire can be made of conventional semiconductor materials, PTC and NTC can be adopted in the application, and preferably, a conventional normal-temperature semiconductor device is adopted, so that the thermistor wire is suitable for the environment temperature of a conventional cable joint, namely-40-300 ℃.
Preferably, the thermistor wire is arranged along the length direction of the cable and is embedded in the explosion-proof blanket in an S-shaped reciprocating winding manner. The coiling mode is suitable for the cable joint with the relatively uniform axial diameter of the cable joint, and the axial diameter of the cable joint is relatively balanced, so that the explosion-proof blanket does not generate radial obvious deformation before and after being wrapped, the arrangement spacing distance is kept in an evenly distributed state by the property of the thermistor wires, the temperature change of each place of the cable joint can be accurately and timely sensed, and the effectiveness of temperature monitoring cannot be attenuated.
If the axial diameters of the cable joints have large differences, namely the cable joints are in a state of different diameters, the thermistor wires are preferably arranged in the width direction of the explosion-proof blanket in an S-shaped reciprocating winding manner and embedded in the explosion-proof blanket. Because the thermistor wire coils along the width direction of explosion-proof blanket, with explosion-proof blanket parcel back on cable joint, the thermistor wire produces along cable joint circumferential direction promptly and winds, can not draw big because of the interval that the parcel diameter leads to the thermistor wire because of the parcel diameter is too big, the problem of monitoring blind area appears. The explosion-proof blanket is tightly wrapped on the periphery of the cable joint, so that the thermistor wire is tightly attached to the surface of the cable joint, and the temperature of the cable joint is sensed in real time.
Preferably, the temperature correction circuit comprises a filtering unit, a rectifying unit and a temperature compensation input unit which are connected in sequence, and the filtering unit is connected with the induction power taking unit. Because the cable joint that is monitored circulates often all is high-voltage alternating current, so the induced current that produces has unstable condition, sets up the effect of rectifier unit and filter unit and lies in the electric current adjustment that gets the electric unit and obtain with the response and supply power for whole electrical apparatus box for the operating condition of electrical apparatus box is more stable, reliable for stable.
In order to improve the adaptability of the induction coil, the method is implemented by adopting the following various modes: the induction coil is arranged by adopting a multi-turn single coil, a magnetic gathering armature is axially arranged on the inner diameter of the induction coil, and the shape of the magnetic gathering armature adopts any one of an I shape, a T shape, a U shape and an E shape; or the induction coil is formed by connecting multiple turns of double coils in series, and the double coils of the induction coil share one U-shaped magnetic gathering armature. Adopt the cable joint of the different installation states of aim at adaptation of above-mentioned multiple induction coil's setting all can carry out continuous work through the effectual stable induced current power supply box that acquires of induction coil. The explosion-proof blanket is fixed through a plurality of hoops.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a front view of the present invention in an installed state;
FIG. 2 is a perspective isometric view of FIG. 1;
FIG. 3 is a block diagram of the electrical schematic of the present invention;
FIG. 4 is a diagram of an induction power-taking unit and a rectifying and filtering circuit;
FIG. 5 is a temperature compensated input circuit diagram;
FIG. 6 is a circuit diagram of a communication module;
FIG. 7 is a signal processing circuit diagram;
in the figure: 1-a cable; 2-an electrical appliance box; 3-explosion-proof blanket; 4, clamping a hoop; 5-an induction coil; 6-magnetic gathering armature.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example 1:
the passive wireless temperature detection device shown in the attached figures 1-3 comprises an explosion-proof blanket 3 wrapped on the outer circumference of a cable joint, wherein an induction electricity-taking unit and a grid temperature measuring unit are embedded in the explosion-proof blanket 3, and the induction electricity-taking unit generates induction current through the current in a cable 1 to supply power for an electrical box 2 arranged on the outer circumference of the cable 1; the electric appliance box 2 is internally and respectively provided with a temperature correction circuit which is electrically connected with the grid temperature measuring unit and a signal processing circuit which is connected with the temperature correction circuit and is used for converting an electric signal which is sensed by the grid temperature measuring unit and is adjusted by the temperature correction circuit into a digital signal; the signal processing circuit is also connected with a communication module used for wirelessly transmitting the converted digital signal. The explosion-proof blanket 3 is made of an insulating composite material containing high-temperature-resistant ceramic particles and quartz particles, the induction electricity taking unit comprises an induction coil 5, and the axial direction of the induction coil 5 is parallel to or perpendicular to the axial direction of the cable 1. The installation structure of this embodiment is simple, and is compact, and the main component is by the explosion-proof blanket 3 of parcel in the cable joint outside and with the electrical apparatus box 2 of the interior induction electricity-taking unit of explosion-proof blanket 3 and the electric connection of net temperature measurement unit. No matter be used for buried cable, still be used for the joint monitoring homoenergetic of overhead cable and effectively install, the suitability is strong.
In this embodiment, the explosion-proof blanket 3 made of an insulating composite material has the advantages of good insulating property and low hardness, and is beneficial to wrapping cable connectors of any shape and size, so that the explosion-proof blanket 3 has high adhesion to the surfaces of the cable connectors and does not generate virtual oxidation, and meanwhile, the grid temperature measuring unit embedded in the explosion-proof blanket 3 can be more adhered to the surfaces of the cable connectors, so that the temperature change of the cable connectors can be sensed more quickly, and the temperature sensitivity of the temperature sensing device is indirectly improved. The purpose of adding high temperature resistant ceramic granule and quartz granule in insulating combined material is the high temperature resistance that further improves explosion-proof blanket 3, make cable joint surface and insulating combined material's contact surface littleer, when cable joint takes place high temperature or catches fire because of the unexpected condition, under the continuous effect of high temperature, the ceramic granule of bulk density and quartz granule can form the fire-resistant flame retardant coating of one deck under melting insulating combined material's parcel, the inside oxygen of isolated cable joint simultaneously, make the intensity of a fire can not stretch or slow down the speed of stretching greatly.
The working principle is as follows: in actual work, because alternating current passes through the cable 1, countless magnetic induction lines can be generated in the circumferential direction of the cable 1, the reaction electricity taking units arranged on the outer circumference of the cable 1 generate induced current in the magnetic induction lines densely distributed around the cable 1, and the generated induced current is used as a power supply source of the electric appliance box 2, so that the electric appliance box 2 can always keep a working state in the power transmission process of the cable 1, the temperature correction circuit in the electric appliance box 2 acquires the temperature of the cable joint through the grid temperature measuring unit tightly attached to the outer side of the cable joint, and finally, the collected temperature information is sent to the communication module through the signal processing circuit, the communication module sends the information to the background server according to a preset rule, and a power supply network maintenance worker can master the working condition of the cable joint in the whole power grid. In the process, because the grid temperature measuring units are made of different materials and have different temperature sensitivities, the resistance value changes along with the change of the temperature in the process of changing along with the temperature, and the set purpose of the temperature correcting circuit is used for carrying out conversion and objective reflection through the sensing of the grid temperature measuring units on the temperature; the specific principle is as follows: the temperature of the cable joint is continuously increased, the internal resistance of the grid temperature measuring unit is changed due to the temperature change, the current passing through the grid temperature measuring unit is changed, and objective reaction to the temperature change is realized through the change of the current.
The scheme of the embodiment has the advantages that:
the grid temperature measuring unit is completely different from the existing single temperature sensor, the coverage surface of the grid temperature measuring unit is wider than that of the existing single temperature sensor, the whole cable connector can be completely covered, dead angles and blind areas are not reserved, and the temperature rise of the cable connector caused by looseness or poor contact or any other possible reasons at any position in the cable connector can be monitored. Any covered cable joint area temperature rise can be intuitively reflected, and the problem that a single temperature sensor can only monitor the temperature of one or more point coordinates or one or more relatively concentrated local points, so that objective blind areas and areas are missed to monitor, and further detection data distortion or alarm delay is caused is solved. Compared with the existing single temperature sensor, the scheme of the application is more accurate and sensitive to temperature reaction.
Example 2:
on the basis of the structure and principle of the embodiment 1, further combining with the contents shown in fig. 1-7 of the specification, specifically, the embodiment adopts the following improved technical scheme in terms of structural design:
structural part (b): the induction electricity taking unit comprises two groups of induction coils 5, and a magnetic gathering armature 6 is arranged in the axial inner diameter of any group of induction coils 5. The induction coil 5 is formed by connecting multiple turns of double coils in series, and the double coils of the induction coil 5 share one U-shaped magnetic gathering armature 6. Adopt above-mentioned induction coil 5's setting to be adapted to the installation of conventional straight cable joint, the magnetic induction line that straight cable 1 produced is distributed along circumference with cable 1 as the axis, and magnetic induction line can be effectual obtains stable induced current power supply box 2 through induction coil 5 and carry out continuous work under this kind of state.
In this embodiment, the grid temperature measuring unit is a thermistor wire embedded in the explosion-proof blanket 3 near one side of the cable 1. The thermistor wire can be made of conventional PTC semiconductor material, and the effective working temperature is-40 deg.C-300 deg.C. Since the cable joint monitored in this embodiment is straight, the thermistor wire is used and arranged along the length direction of the cable 1 and is embedded in the explosion-proof blanket 3 by winding in an S-shaped reciprocating manner. The coiling mode is suitable for the cable joint with the relatively uniform axial diameter of the cable joint, and the axial diameter of the cable joint is relatively balanced, so that the explosion-proof blanket 3 does not generate radial obvious deformation before and after being wrapped, the arrangement spacing distance is still kept in a uniformly distributed state by the property of the thermistor wires, the temperature change of each place of the cable joint can be accurately and timely sensed, and the effectiveness of temperature monitoring cannot be attenuated. Finally, the explosion-proof blanket 3 is fixed on the cable joint by adopting a plurality of hoops 4.
An electrical part: the electric appliance box 2 is internally and respectively provided with a temperature correction circuit which is electrically connected with the grid temperature measuring unit and a signal processing circuit which is connected with the temperature correction circuit and is used for converting an electric signal which is sensed by the grid temperature measuring unit and is adjusted by the temperature correction circuit into a digital signal; the signal processing circuit is also connected with a communication module used for wirelessly transmitting the converted digital signal. The temperature correction circuit comprises a filtering unit, a rectifying unit and a temperature compensation input unit which are sequentially connected, and the filtering unit is connected with the induction electricity taking unit. Because the cable joint that is monitored circulates often all is high-voltage alternating current, so the induced current that produces has unstable condition, sets up the effect of rectifier unit and filter unit and lies in the electric current adjustment that gets the electric unit and obtain with the response and supply power for whole electrical apparatus box 2 for the operating condition of electrical apparatus box 2 is more stable, reliable for stable. The induction electricity taking unit, the rectification filter circuit, the temperature compensation input circuit, the communication module circuit and the signal processing circuit in the embodiment are respectively realized by adopting the connection modes shown in circuit diagrams shown in fig. 4-7; indeed, fig. 4-7 only illustrate one of the circuit designs that satisfies the technical solutions described in the present embodiment, and are not the only circuit design for implementing the present application, and should not be understood as a specific limitation to the electrical schematic block diagram such as that shown in fig. 3. The specific working principle is as described in embodiment 1, and will not be described herein.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A passive wireless temperature detection device is characterized in that: the temperature-sensing power-taking cable comprises an explosion-proof blanket (3) wrapped on the outer circumference of a cable joint, wherein an induction power-taking unit and a grid temperature-measuring unit are embedded in the explosion-proof blanket (3), and the induction power-taking unit generates induction current through current in a cable (1) to supply power for an electric appliance box (2) arranged on the outer circumference of the cable (1);
the electric appliance box (2) is internally and respectively provided with a temperature correction circuit which is electrically connected with the grid temperature measuring unit and a signal processing circuit which is connected with the temperature correction circuit and is used for converting an electric signal which is sensed by the grid temperature measuring unit and adjusted by the temperature correction circuit into a digital signal; the signal processing circuit is also connected with a communication module used for wirelessly transmitting the converted digital signal.
2. A passive wireless temperature sensing device according to claim 1, wherein: the explosion-proof blanket (3) is made of an insulating composite material containing high-temperature-resistant ceramic particles and quartz particles, the induction electricity taking unit comprises an induction coil (5), and the axial direction of the induction coil (5) is parallel to or perpendicular to the axial direction of the cable (1).
3. A passive wireless temperature sensing device according to claim 2, wherein: the induction electricity taking unit comprises one or more groups of induction coils (5), and a magnetic gathering armature iron (6) is installed in the axial inner diameter of any group of induction coils (5).
4. A passive wireless temperature sensing device according to any of claims 1-3, wherein: the grid temperature measuring unit is a thermistor wire embedded in one side of the explosion-proof blanket (3) close to the cable (1).
5. A passive wireless temperature sensing device according to claim 4, wherein: the thermistor wires are arranged along the length direction of the cable (1) and are embedded in the explosion-proof blanket (3) in an S-shaped reciprocating coiling manner.
6. A passive wireless temperature sensing device according to claim 4, wherein: the thermistor wires are arranged in the width direction of the explosion-proof blanket (3) in an S-shaped reciprocating winding manner and are embedded in the explosion-proof blanket (3).
7. A passive wireless temperature sensing device according to claim 1, wherein: the temperature correction circuit comprises a filtering unit, a rectifying unit and a temperature compensation input unit which are sequentially connected, and the filtering unit is connected with the induction electricity taking unit.
8. A passive wireless temperature sensing device according to claim 3, wherein: the induction coil (5) is arranged by adopting a multi-turn single coil, the inner diameter of the induction coil (5) is axially provided with a magnetic gathering armature iron (6), and the shape of the magnetic gathering armature iron (6) adopts any one of an I type, a T type, a U type and an E type.
9. A passive wireless temperature sensing device according to claim 3, wherein: the induction coil (5) is formed by connecting multiple turns of double coils in series, and the double coils of the induction coil (5) share one U-shaped magnetic gathering armature (6).
10. A passive wireless temperature sensing device according to claim 1, wherein: the explosion-proof blanket (3) is fixed through a plurality of hoops (4).
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| CN202010601848.5A CN111551286A (en) | 2020-06-28 | 2020-06-28 | Passive wireless temperature detection device |
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| CN202010601848.5A CN111551286A (en) | 2020-06-28 | 2020-06-28 | Passive wireless temperature detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111986430A (en) * | 2020-09-01 | 2020-11-24 | 宁波葆尔新材料有限公司 | Intelligent early-warning fireproof and explosion-proof blanket and preparation method and application thereof |
| CN113188682A (en) * | 2021-06-01 | 2021-07-30 | 中广核新能源六安有限公司 | Automatic temperature measurement protection device for cable joint on high-voltage side of box-type substation |
| CN114069545A (en) * | 2021-10-18 | 2022-02-18 | 山东雷纳新材料工程有限公司 | Temperature measurement type cable joint fire blanket |
-
2020
- 2020-06-28 CN CN202010601848.5A patent/CN111551286A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111986430A (en) * | 2020-09-01 | 2020-11-24 | 宁波葆尔新材料有限公司 | Intelligent early-warning fireproof and explosion-proof blanket and preparation method and application thereof |
| CN113188682A (en) * | 2021-06-01 | 2021-07-30 | 中广核新能源六安有限公司 | Automatic temperature measurement protection device for cable joint on high-voltage side of box-type substation |
| CN114069545A (en) * | 2021-10-18 | 2022-02-18 | 山东雷纳新材料工程有限公司 | Temperature measurement type cable joint fire blanket |
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