CN117310241A - Ammeter with fire safety function - Google Patents
Ammeter with fire safety function Download PDFInfo
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- CN117310241A CN117310241A CN202311618982.6A CN202311618982A CN117310241A CN 117310241 A CN117310241 A CN 117310241A CN 202311618982 A CN202311618982 A CN 202311618982A CN 117310241 A CN117310241 A CN 117310241A
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- 238000000034 method Methods 0.000 claims description 32
- 230000005611 electricity Effects 0.000 claims description 16
- 230000005856 abnormality Effects 0.000 claims description 10
- 238000013507 mapping Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000010606 normalization Methods 0.000 claims description 5
- 230000017525 heat dissipation Effects 0.000 description 17
- 230000002159 abnormal effect Effects 0.000 description 13
- 238000001514 detection method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 241000883990 Flabellum Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
Abstract
The invention relates to the technical field of ammeter measuring instruments, in particular to an ammeter with a fire safety function. The ammeter detects the temperature information of the ammeter through a local temperature sensor inside the shell and an air outlet temperature sensor at an air outlet of the shell. The temperature fluctuation between the temperature information of the local temperature sensor is analyzed through the integrated circuit, so that the temperature difference between the temperature information of the air outlet temperature sensor and the temperature information of the local temperature sensor is obtained, and the temperature information of the local temperature sensor is combined to judge whether the ammeter has fire hazards or not. The fire-fighting hidden danger is eliminated through the control of the rotating speed of the fan, and if the fire-fighting can not be eliminated, the power supply is subjected to open-circuit control, so that fire is avoided. According to the invention, the radiating fan and the power supply are controlled through the local temperature information and the air outlet temperature information in the ammeter, so that the accurate judgment and avoidance of the hidden danger of the fire fighting are realized.
Description
Technical Field
The invention relates to the technical field of ammeter measuring instruments, in particular to an ammeter with a fire safety function.
Background
The ammeter box is composed of a plurality of ammeter instruments and other circuits, the density of the electrical appliances is high, and the independence among the electrical appliances is high, so that in the use process, the temperature rise caused by overload of a certain electrical appliance can occur, the circuits or other devices in the ammeter box are affected, and a fire disaster is generated.
Fire safety monitoring in the ammeter case generally carries out ammeter temperature detection through adding temperature sensor among the prior art, like current patent CN206675855U introduced an ammeter case fire control unit, its concrete principle for increased a temperature-sensitive switch in the inside of ammeter case, utilized the change of ammeter incasement temperature to carry out the conflagration early warning of the emergence of ammeter inside and monitor, and then realized fire safety monitoring. But because the independence is higher between the electric appliances in the ammeter case, receive the influence of power consumption and external real-time temperature, consequently only use temperature information to carry out the circumstances that fire safety control easily takes place the mistake leak hunting and detects, and then influence actual fire safety detection.
Disclosure of Invention
In order to solve the technical problem that the fire safety detection is easy to cause false leakage detection only according to the temperature in the prior art, the invention aims to provide an ammeter with a fire safety function, and the adopted technical scheme is as follows:
the invention provides an ammeter with a fire safety function, which comprises a shell (10), wherein the shell (10) comprises a power supply (9), an ammeter (11) and an integrated circuit (12), and the shell (10) comprises an air inlet (3) and an air outlet (7); a fan (2) is arranged at the position of the air inlet (3) at the inner side of the shell (10), and local temperature sensors are arranged at different positions in the shell (10); an air outlet temperature sensor (8) is arranged at the position of the air outlet (7) outside the shell (10);
-the integrated circuit (12) receives temperature information of the local temperature sensor and the outlet air temperature sensor (8), the integrated circuit (12) feeding back control commands to the fan (2) and the power supply (9);
the method of the integrated circuit (12) feedback control command includes:
the integrated circuit (12) obtains temperature fluctuation among temperature information of different local temperature sensors, obtains temperature difference among the air outlet temperature sensor (8) and the temperature information of the local temperature sensors, and obtains temperature normal probability according to the temperature information of the local temperature sensors, the temperature fluctuation and the temperature difference; judging whether the ammeter has fire hidden danger according to the temperature normal probability; if the fire-fighting hidden danger exists, a first control command is sent to the fan (2), and the first control command adjusts the rotating speed of the fan (2) according to the temperature information of the local temperature sensor and the air outlet temperature sensor (8); the fan (2) judges whether the fire-fighting hidden danger can be relieved according to the change of the normal temperature probability after the rotating speed is regulated, if the fire-fighting hidden danger cannot be relieved, a second control command is fed back to the power supply (9), and the second control command controls the power supply (9) to execute the breaking operation.
Further, the local temperature sensors are provided in 4 different positions within the housing (10).
Further, the method of the integrated circuit (12) to obtain the temperature volatility comprises:
and taking the variance of the temperature information among different local temperature sensors as the temperature fluctuation.
Further, the method of the integrated circuit (12) to obtain the temperature differential comprises:
obtaining a first temperature difference between the temperature information of the air outlet temperature sensor (8) and the maximum temperature information of the local temperature sensor; obtaining a second temperature difference between the temperature information of the air outlet temperature sensor (8) and the minimum temperature information of the local temperature sensor; taking the ratio of the first temperature difference to the second temperature difference as temperature uniformity; mapping and normalizing the temperature uniformity negative correlation to obtain the temperature difference.
Further, the method of the integrated circuit (12) to obtain the temperature normality probability comprises:
multiplying the average temperature of the local temperature sensor, the temperature fluctuation and the temperature difference to obtain temperature abnormality; and carrying out negative correlation mapping and normalization on the temperature abnormality to obtain the temperature normal probability.
Further, the method for judging whether the ammeter has fire hazards by the integrated circuit (12) comprises the following steps:
and if the temperature normal probability is smaller than a preset normal probability threshold, judging that the ammeter has fire hidden danger.
Further, the fan (2) comprises a dynamic adjustable resistor, and if the ammeter has no fire hazard, the fan (2) operates according to the preset initial resistor of the dynamic adjustable resistor.
Further, the integrated circuit (12) adjusts the rotation speed of the fan (2) according to the temperature information of the local temperature sensor and the air outlet temperature sensor (8) comprises:
obtaining an adjustment resistance of the dynamically adjustable resistance using an adjustment resistance formula, the adjustment resistance formula comprising:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein,for the purpose of the said adjustment of the resistance,for the initial resistance of the resistor to be described,for the preset resistance adjustment parameter(s),is the average temperature of the local temperature sensor,is the temperature of the air outlet temperature sensor (8);
the fan (2) adjusts the dynamically adjustable resistor to the adjustment resistor for operation.
Further, the method for judging whether the fire hazard can be relieved by the integrated circuit (12) comprises the following steps:
if the fan (2) runs for a preset reference time period after the rotating speed is adjusted, the electric meter is still judged to have fire-fighting hidden danger according to the temperature normal probability, and the fire-fighting hidden danger is judged to be unable to be relieved.
Further, the reference period is set to 1 minute.
The invention has the following beneficial effects:
the ammeter provided by the invention is provided with a plurality of local temperature sensors inside, and the outside of the air outlet is also provided with an air outlet temperature sensor. In order to avoid fire safety false leakage detection caused by only analyzing temperature information, the electric meter provided by the invention utilizes an internal integrated circuit to analyze the temperature fluctuation between the temperature information of the local temperature sensor, further analyzes the temperature difference between the temperature information of the air-out temperature sensor and the temperature information of the local temperature sensor, further obtains the temperature normal probability, and determines the temperature distribution condition in the electric meter box through the fluctuation of the temperature information at different positions and the temperature at the air-out position, thereby judging whether the current electric meter has fire hazards or not according to the temperature normal probability. The ammeter provided by the invention is also provided with the fan, the heat dissipation function can be realized through the fan, when the current ammeter is detected to have fire hazards, the further heat dissipation function can be realized through adjusting the rotating speed of the fan, and the fire accidents are prevented; and further, judging whether the current ammeter can relieve the fire-fighting hidden danger or not according to the change condition of the normal temperature probability after the rotating speed is regulated by the fan, if the current ammeter can not relieve the fire-fighting hidden danger, executing the circuit breaking operation in time by a power switch in the ammeter box, and avoiding the generation of fire. The ammeter provided by the invention realizes the fire safety function through analyzing the temperature distribution and controlling the device.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions and advantages of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a diagram of an electricity meter with fire safety function according to an embodiment of the present invention.
FIG. 2 is a flow chart of a method for feedback control commands of an integrated circuit according to an embodiment of the invention.
The reference numerals in the figures are: 1. a first local temperature sensor; 2. a fan; 3. an air inlet; 4. a second local temperature sensor; 5. a third local temperature sensor; 6. a fourth local temperature sensor; 7. an air outlet; 8. an air outlet temperature sensor; 9. a power supply; 10. a housing; 11. an electricity meter; 12. an integrated circuit; s1, a step S1; s2, step S2.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description is given below of an ammeter with fire safety function according to the invention, and the specific implementation, structure, characteristics and effects thereof are as follows, with reference to the accompanying drawings and the preferred embodiments. In the following description, different "one embodiment" or "another embodiment" means that the embodiments are not necessarily the same. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The following specifically describes a specific scheme of the electric meter with fire safety function provided by the invention with reference to the accompanying drawings.
Referring to FIG. 1, a block diagram of an electricity meter with fire safety features according to one embodiment of the present invention is shown, the electricity meter includes a housing 10, and the housing 10 includes basic electricity meter components, such as a power supply 9, an electricity meter 11, and an integrated circuit 12. It should be noted that, the functions implemented by the power supply 9 and the electric meter 11 are basic functions in the existing electric meter, including but not limited to electric data display, power supply, power failure, and electric switch, which are not described herein, and the integrated circuit 12 includes a data processing chip in addition to the basic circuit functions, where the data processing chip is used for processing temperature information and generating control commands.
The air inlet 3 and the air outlet 7 are protected on the housing 10. Inside shell 10, air inlet 3 position department installs fan 2, and fan 2 is used for the heat dissipation in the ammeter case, and through the flabellum rotation with outside air from air inlet 3 suction shell 10 inside, the inside air of shell 10 blows out from air outlet 7 through the influence of air current, takes away the heat in the ammeter case through the air current, has realized the heat dissipation function. Further mounted at different locations inside the housing 10 are local temperature sensors, as shown in fig. 1, fig. 1 is a preferred embodiment of the present invention, four different locations are selected, a first local temperature sensor 1, a second local temperature sensor 4, a third local temperature sensor 5 and a fourth local temperature sensor 6 are mounted. The local temperature sensor functions to acquire temperature information at different locations inside the meter box and transmit the temperature information to a data processing chip in the integrated circuit 12. Besides the local temperature sensor, an air outlet temperature sensor 8 is further installed at the position of the air outlet 7 outside the casing 10, and the air outlet temperature sensor 8 is used for monitoring the temperature of the air flow blown out after the air flow in the ammeter box radiates heat at the air outlet 7 and transmitting corresponding temperature information to a data processing chip in the integrated circuit 12.
The integrated circuit 12 receives the temperature information of each local temperature sensor and the air outlet temperature sensor 8, processes the temperature information through the data processing chip, and feeds back control commands to the fan 2 and the power supply 9. By controlling the fan 2 and the power supply 9, the fire safety function of the ammeter is realized.
It should be noted that, the connection manner of each device in the ammeter provided by the embodiment of the present invention is an existing line connection, which is not described in detail. The data processing chip in the integrated circuit 12 may be a programmable logic chip such as a 51-chip microcomputer, which is not described herein.
Referring to fig. 2, a flowchart of a method for feeding back control commands to an integrated circuit according to an embodiment of the invention is shown, and the method includes.
Step S1: the integrated circuit obtains temperature fluctuation among temperature information of different local temperature sensors, obtains temperature difference among the temperature information of the air-out temperature sensor and the local temperature sensor, and obtains temperature normal probability according to the temperature information, the temperature fluctuation and the temperature difference of the local temperature sensor.
Traditional realization that utilizes temperature monitoring function to carry out ammeter fire control function mainly relies on the inside temperature sensor of ammeter case to the control of temperature, when temperature sensor detects the temperature value unusual, then the inside switch of control ammeter case cuts off the power supply to this avoids the ammeter to take place fire control problem. For the judgment of abnormal temperature value, the conventional judgment method is to set an abnormal temperature threshold value, and judge the monitored temperature as the abnormal temperature value when the monitored temperature exceeds the abnormal temperature threshold value. But the inside distribution of ammeter case a plurality of ammeter and electrical apparatus, the power and the heating capacity of different electrical apparatus are different to because the distribution density of different ammeter and electrical apparatus is different and the inside air fluxion nature of ammeter case is relatively poor, make the temperature distribution in the ammeter case inhomogeneous, therefore whether directly judge the condition that leads to erroneous judgement easily through the temperature value of temperature sensor monitoring if produce fire control hidden danger.
Therefore, in the electric meter provided by the embodiment of the invention, a plurality of local temperature sensors are installed, and the local temperature sensors are distributed at different positions, so that in order to avoid erroneous judgment caused by only analyzing the monitored temperature values of the temperature sensors, the integrated circuit 12 obtains the temperature fluctuation between the temperature information of the different local temperature sensors after receiving the temperature information of the local temperature sensors and the temperature information of the air-out temperature sensor 8, and obtains the temperature difference between the temperature information of the air-out temperature sensor 8 and the temperature information of the local temperature sensors. Since the temperature inside the ammeter box is normal, the distribution of the temperature information monitored by the local temperature sensors at different positions should be different but consistent as a whole because of the influence of the heat radiation fan, and the temperature information monitored by the outlet air temperature sensor 8 at the position of the outlet air 7 should be similar to the temperature information of the local temperature sensors; under the abnormal condition of the temperature inside the electric meter box, the abnormal heating caused by the overload and other problems of a certain device inside the electric meter box is generated, the local temperature sensor at the position where the problem occurs has a more obvious abnormal temperature value, and the local temperature sensors at different positions can be caused to have different temperature information in spite of the heat dissipation of the fan 2 in the electric meter box, and certain difference exists between the temperature monitored by the air outlet sensor 8 and the temperature information of the local temperature sensor because of the failure of the heat dissipation function. Therefore, the abnormal temperature condition in the electric meter box can be represented by utilizing the temperature fluctuation and the temperature difference, and the temperature normal probability in the electric meter box can be determined by further combining the temperature information of the local temperature sensor. And judging whether the temperature information in the current ammeter box is normal or not according to the temperature normal probability, and judging whether fire hazards exist or not.
Preferably, in one embodiment of the present invention, the variance of the temperature information between the different local temperature sensors is taken as the temperature fluctuation. I.e. the temperature fluctuation, is formulated as:whereinIn order for the temperature to be fluctuating,for the number of local temperature sensors,is the firstTemperature information of the individual local temperature sensors,is the average temperature of the local temperature sensor. It should be noted that the variance is a technical means well known to those skilled in the art, and the meaning and principle thereof will not be described herein.
Preferably, in one embodiment of the present invention, the method of obtaining temperature variability for integrated circuit 12 includes:
obtaining a first temperature difference between the temperature information of the air outlet temperature sensor 8 and the maximum temperature information of the local temperature sensor; obtaining a second temperature difference between the temperature information of the air outlet temperature sensor 8 and the minimum temperature information of the local temperature sensor; taking the ratio of the first temperature difference to the second temperature difference as temperature uniformity, namely that the value range of the ratio is between 0 and 1, the more the value range of the ratio is approaching to 1, the smaller the temperature difference between the temperature at the air outlet 7 and the temperature inside the shell 10 is, the more uniform the temperature distribution in the current ammeter box is, and the better the heat dissipation effect of the fan 2 is; and mapping and normalizing the temperature uniformity negative correlation to obtain temperature difference.
It should be noted that, because the temperature uniformity value range in the embodiment of the present invention is between 0 and 1, the method of mapping and normalizing the temperature uniformity negative correlation can directly use the positive integer 1 to subtract the temperature uniformity to obtain the temperature difference. Other methods of negative correlation mapping and normalization may be used in other embodiments of the present invention, and are not limited and described herein. The temperature difference is formulated as:the method comprises the steps of carrying out a first treatment on the surface of the Wherein,in order to be able to achieve a temperature difference,for the temperature information collected by the outlet air temperature sensor 8,is the maximum temperature information of the local temperature sensor,is the minimum temperature information of the local temperature sensor.
Preferably, the method of obtaining a normothermic probability for integrated circuit 12 in one embodiment of the invention includes:
the average temperature, the temperature fluctuation and the temperature difference of the local temperature sensor are multiplied to obtain the temperature abnormality. The larger the average temperature is, the higher the overall temperature in the current ammeter box is, the more abnormal the temperature is, and the greater the temperature abnormality is; the larger the temperature fluctuation is, the abnormal temperature information which is generated in the ammeter box after the heat dissipation regulation of the fan 2 is shown, the temperature distribution in the ammeter box is uneven, the heat dissipation effect is reduced, and the more abnormal the temperature in the ammeter box is, the larger the temperature abnormality is shown; the larger the temperature difference is, the larger the temperature difference between the temperature of the air outlet 7 and the temperature inside the electric meter box is, the more serious the temperature non-uniformity inside the electric meter box is, the heat dissipation effect of the fan is reduced, and the more abnormal the temperature inside the electric meter box is, the larger the temperature abnormality is. Therefore, the temperature abnormality is subjected to negative correlation mapping and normalization, and the temperature normal probability is obtained, namely, the larger the temperature normal probability is, the more normal the temperature information in the current ammeter box is. In one embodiment of the invention, the temperature normal probability is formulated as:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein the method comprises the steps ofFor the current momentThe probability of a normal temperature at the lower temperature,is a natural constant. Namely, the embodiment of the invention realizes the negative correlation mapping and normalization by taking the negative number of the temperature abnormality as the power of the exponential function through the exponential function based on the natural constant. In other embodiments of the present invention, other functions or basic mathematical operations may be used to implement the negative correlation mapping, and the specific method is a technical means well known to those skilled in the art, which is not described herein.
Step S2: judging whether the ammeter has fire hidden danger according to the temperature normal probability; if the fire-fighting hidden danger exists, a first control command is sent to the fan, and the first control command adjusts the rotating speed of the fan according to the temperature information of the local temperature sensor and the air outlet temperature sensor; after the rotating speed of the fan is regulated, judging whether the fire-fighting hidden danger can be relieved according to the change of the normal temperature probability, and if the fire-fighting hidden danger cannot be relieved, feeding back a second control command to the power supply, wherein the second control command controls the power supply to execute the breaking operation.
After the temperature normal probability is obtained, whether the temperature characteristics in the ammeter are abnormal or not can be judged according to the temperature normal probability, and whether the ammeter has fire hazards or not is judged.
Preferably, in one embodiment of the present invention, if the temperature normal probability is smaller than a preset normal probability threshold, determining that the electric meter has a fire hazard; and if the electric meter is in the reverse direction, judging that the electric meter has no fire hidden trouble. In the embodiment of the invention, the normal probability threshold is set to 0.8.
In an embodiment of the invention, the integrated circuit 12 will feed back control commands to both the fan 2 and the voltage 9 devices. The feedback control command to the fan 2 is to adjust the rotating speed of the fan 2, when the fire hazard is judged, the radiating effect in the ammeter box is enhanced by controlling the rotating speed of the fan 2, the air circulation in the ammeter box is accelerated, and the outside low-temperature air is introduced to cool the interior of the ammeter box, so that the fire hazard is eliminated. When the temperature in the ammeter box still cannot solve the fire hidden danger by utilizing the heat dissipation of the fan 2, the control power supply 9 is powered off to cut off the heating source in the ammeter box, so that the fire disaster is prevented. Therefore, if the current ammeter box is judged to have fire hazards, the integrated circuit 12 sends a first control command to the fan 2, and the first control command can adjust the rotating speed of the fan 2 according to the temperature information of the local temperature sensor and the air outlet temperature sensor 8 so as to achieve the effect of enhancing heat dissipation. Because the implementation of the fire safety function in the embodiment of the invention is real-time, that is, the temperature data in the electric meter box is monitored in real time according to the fixed detection frequency and controlled in real time, after the rotation speed is regulated, the fan 2 can judge whether the fire hazard can be relieved according to the change of the normal probability of the temperature, if the fire hazard can not be relieved, the integrated circuit 12 feeds back a second control command to the power supply 9, and the second control command is used for controlling the power supply 9 to execute the breaking operation, so as to prevent the fire hazard.
Preferably, in one embodiment of the present invention, the fan 2 includes a dynamically adjustable resistor, and if the electricity meter has no fire hazard, the fan 2 operates according to a preset initial resistance of the dynamically adjustable resistor. That is, the fan 2 at the initial resistance is operated at a lower power, which can provide a certain heat dissipation capacity while saving consumption of electric power. It should be noted that, the initial resistor can be set according to the specific fan model and the purpose of the implementer, in one embodiment of the present invention, the initial resistor is set to be the maximum resistor of the dynamically adjustable resistor, that is, the fan rotates only according to the lowest speed, and the purpose is to extract the external air at the air inlet, so that the air flows at different positions inside the electric meter box are disordered, the temperature detection of the subsequent local temperature sensor is convenient, and the cooling function is poor, therefore, in the embodiment of the present invention, the initial resistor can be set according to the purpose of the implementer, and no limitation and no detailed description are given here.
Preferably, in one embodiment of the present invention, the integrated circuit 12 adjusts the rotation speed of the fan 2 according to the temperature information of the local temperature sensor and the outlet air temperature sensor 8, including:
obtaining an adjustment resistance of the dynamically adjustable resistance using an adjustment resistance formula, the adjustment resistance formula comprising:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein,in order to adjust the resistance of the resistor,for the initial resistance to be the same,for the preset resistance adjustment parameter(s),is the average temperature of the local temperature sensor,is the temperature of the outlet air temperature sensor 8. In one embodiment of the invention, electricity is usedThe resistance adjustment parameter is set to 0.1 times the maximum resistance of the dynamically adjustable resistance.
In the formula of the adjustment resistance,the larger the temperature value inside the current ammeter box is, the more fire disaster is easy to happen;smaller indicates that the current fan 2 has poorer heat dissipation function and cannot achieve the purpose of heat dissipation, soAs a parameter index for the resistance adjustment,the larger the description, the more the dynamic adjustable resistance in the fan needs to be reduced, so that the fan power is increased, and the fan rotating speed is improved. It should be noted that, the resistance adjustment parameter may be set by itself according to the model of the dynamically adjustable resistor and the historical statistics, which is not described herein.
The fan 2 operates with the dynamically adjustable resistor adjusted to an adjustment resistor.
Preferably, in one embodiment of the present invention, the method for determining whether fire hazards are capable of being resolved by integrated circuit 12 includes:
if the fan 2 still judges that the ammeter has fire-fighting hidden danger according to the normal temperature probability after running for a preset reference time period after rotating speed adjustment, judging that the fire-fighting hidden danger cannot be relieved; otherwise, if the ammeter is judged to have no fire safety hidden trouble according to the normal probability of the temperature, the current heat dissipation function is indicated to meet the heat dissipation requirement, and the fire safety hidden trouble can be eliminated.
In one embodiment of the invention, the sampling frequency of all the temperature sensors is set to 1 second, that is, a set of temperature information can be obtained every second, whether the ammeter box has fire hazard or not is judged, and the reference time period is set to 1 minute. It should be noted that, in one embodiment of the present invention, considering that a certain power loss is generated when the fan is operated at a high rotation speed all the time, when it is determined that the fire hazard can be relieved, the fan can continue to operate at the current rotation speed for a preset period of time, and after the period of time is over, the fan is restored to the initial rotation speed, and if the fire hazard still exists after the period of time is over, the fan rotation speed is continuously controlled according to the control method. The setting of the time period may be specifically judged according to the specific implementation scenario, and is set to 10 minutes in one embodiment of the present invention.
In summary, the electric meter provided by the embodiment of the invention detects the temperature information of the electric meter through the local temperature sensor inside the shell and the air outlet temperature sensor of the air outlet of the shell. The temperature fluctuation between the temperature information of the local temperature sensor is analyzed through the integrated circuit, so that the temperature difference between the temperature information of the air outlet temperature sensor and the temperature information of the local temperature sensor is obtained, and the temperature information of the local temperature sensor is combined to judge whether the ammeter has fire hazards or not. The fire-fighting hidden danger is eliminated through the control of the rotating speed of the fan, and if the fire-fighting can not be eliminated, the power supply is subjected to open-circuit control, so that fire is avoided. According to the invention, the radiating fan and the power supply are controlled through the local temperature information and the air outlet temperature information in the ammeter, so that the accurate judgment and avoidance of the hidden danger of the fire fighting are realized.
It should be noted that: the sequence of the embodiments of the present invention is only for description, and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
Claims (10)
1. An ammeter with a fire safety function comprises a shell (10), wherein the shell (10) comprises a power supply (9), an ammeter (11) and an integrated circuit (12), and the ammeter is characterized in that the shell (10) comprises an air inlet (3) and an air outlet (7); a fan (2) is arranged at the position of the air inlet (3) at the inner side of the shell (10), and local temperature sensors are arranged at different positions in the shell (10); an air outlet temperature sensor (8) is arranged at the position of the air outlet (7) outside the shell (10);
-the integrated circuit (12) receives temperature information of the local temperature sensor and the outlet air temperature sensor (8), the integrated circuit (12) feeding back control commands to the fan (2) and the power supply (9);
the method of the integrated circuit (12) feedback control command includes:
the integrated circuit (12) obtains temperature fluctuation among temperature information of different local temperature sensors, obtains temperature difference among the air outlet temperature sensor (8) and the temperature information of the local temperature sensors, and obtains temperature normal probability according to the temperature information of the local temperature sensors, the temperature fluctuation and the temperature difference; judging whether the ammeter has fire hidden danger according to the temperature normal probability; if the fire-fighting hidden danger exists, a first control command is sent to the fan (2), and the first control command adjusts the rotating speed of the fan (2) according to the temperature information of the local temperature sensor and the air outlet temperature sensor (8); the fan (2) judges whether the fire-fighting hidden danger can be relieved according to the change of the normal temperature probability after the rotating speed is regulated, if the fire-fighting hidden danger cannot be relieved, a second control command is fed back to the power supply (9), and the second control command controls the power supply (9) to execute the breaking operation.
2. An electricity meter with fire safety function according to claim 1, characterized in that said local temperature sensors are provided in 4 different positions inside said casing (10).
3. An electricity meter with fire safety function according to claim 1, characterized in that said method for obtaining said temperature fluctuation by said integrated circuit (12) comprises:
and taking the variance of the temperature information among different local temperature sensors as the temperature fluctuation.
4. An electricity meter with fire safety function according to claim 1, characterized in that said method for obtaining said temperature difference by said integrated circuit (12) comprises:
obtaining a first temperature difference between the temperature information of the air outlet temperature sensor (8) and the maximum temperature information of the local temperature sensor; obtaining a second temperature difference between the temperature information of the air outlet temperature sensor (8) and the minimum temperature information of the local temperature sensor; taking the ratio of the first temperature difference to the second temperature difference as temperature uniformity; mapping and normalizing the temperature uniformity negative correlation to obtain the temperature difference.
5. An electricity meter with fire safety function according to claim 1, characterized in that said method for obtaining said temperature normality probability by said integrated circuit (12) comprises:
multiplying the average temperature of the local temperature sensor, the temperature fluctuation and the temperature difference to obtain temperature abnormality; and carrying out negative correlation mapping and normalization on the temperature abnormality to obtain the temperature normal probability.
6. The electric meter with fire safety function according to claim 1, wherein the method for determining whether the electric meter has fire hazards by the integrated circuit (12) comprises:
and if the temperature normal probability is smaller than a preset normal probability threshold, judging that the ammeter has fire hidden danger.
7. An electricity meter with fire safety function according to claim 1, characterized in that the fan (2) comprises a dynamically adjustable resistance, the fan (2) being operated according to a preset initial resistance of the dynamically adjustable resistance if the electricity meter is free of fire hazards.
8. An electricity meter with fire safety function according to claim 7, characterized in that said integrated circuit (12) regulating the rotation speed of said fan (2) according to the temperature information of said local temperature sensor and of said outlet air temperature sensor (8) comprises:
obtaining an adjustment resistance of the dynamically adjustable resistance using an adjustment resistance formula, the adjustment resistance formula comprising:
the method comprises the steps of carrying out a first treatment on the surface of the Wherein (1)>For the regulating resistor, +.>For the initial resistance, +.>For presetting resistance adjustment parameters, < >>Is the average temperature of the local temperature sensor, < +.>Is the temperature of the air outlet temperature sensor (8);
the fan (2) adjusts the dynamically adjustable resistor to the adjustment resistor for operation.
9. The electric meter with fire safety function according to claim 1, wherein the method for determining by the integrated circuit (12) whether the fire hazard can be relieved comprises:
if the fan (2) runs for a preset reference time period after the rotating speed is adjusted, the electric meter is still judged to have fire-fighting hidden danger according to the temperature normal probability, and the fire-fighting hidden danger is judged to be unable to be relieved.
10. An electricity meter with fire safety function according to claim 9, wherein the reference time period is set to 1 minute.
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