CN113030160A - Method and system for obtaining highest surface temperature value of explosion suppression device - Google Patents
Method and system for obtaining highest surface temperature value of explosion suppression device Download PDFInfo
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Abstract
The invention provides a method and a system for acquiring the highest surface temperature value of an explosion-proof device, wherein a resistor is arranged on the inner surface of a rear shell of an explosion-proof box body for testing, a temperature sensor is arranged on a temperature test point on the outer surface of the explosion-proof box body, the power consumption value of the resistor is acquired under different current values, and obtaining a maximum temperature value according to the temperature sensor, obtaining a maximum temperature rise value after subtracting the ambient temperature, carrying out curve fitting on a plurality of groups of power consumption values and the maximum temperature rise value to obtain a fitting formula, substituting the total power consumption value of the components required to be installed into a fitting formula to obtain the highest surface temperature rise value of the explosion-proof device, combining the ambient temperature to be used to obtain the highest surface temperature value of the explosion-proof device, thereby obtaining the group of the explosion-proof devices, different explosion-proof boxes lead the group of the explosion-proof devices to be different, and a proper anti-explosion box body is selected according to the requirement, so that the purpose of quickly selecting the proper anti-explosion box body is realized.
Description
Technical Field
The invention relates to the technical field of explosion-proof equipment, in particular to a method and a system for acquiring the highest surface temperature value of an explosion-proof device.
Background
An explosive environment may occur. (e.g., combustible gas, dusty environment, oil refinery, petrochemical plant, gas station, etc.), an explosive gas atmosphere, a mixture of gas, vapor or a vaporous combustible substance and air, where after ignition, combustion will propagate throughout the environment of the unburned mixture. (for example: explosion-proof electrical equipment such as CH4, C2H2, C2H4, NH3, CO, C2H5OH, etc.). Explosion-proof equipment definition: electrical equipment that does not cause ignition of the surrounding explosive environment under specified conditions. Maximum surface temperature: the highest temperature reached by any part of the electrical equipment that may cause the surrounding explosive environment to ignite when the electrical equipment is operating under the most adverse operating conditions within the specified range. The maximum surface temperature should be below the flammability temperature. For example: the ignition temperature of the explosive gas in the environment of the explosion-proof sensor is 100 ℃, and then the highest surface temperature of any part of the sensor in the worst working state is lower than 100 ℃. For example, the electrical devices for explosive environments are classified into groups of T1-T6 according to their maximum surface temperatures, T1 being 450 ℃, T2 being 300 ℃, T3 being 200 ℃, T4 being 135 ℃, T5 being 100 ℃, T6 being 85 ℃. Flameproof electrical device (d): refers to an electrical device in which a component capable of igniting an explosive mixture is enclosed in a housing capable of withstanding the explosive pressure of the explosive mixture therein and preventing propagation of an explosion with the surrounding explosive mixture.
The existing explosion-proof box bodies are various in types, a user often needs to spend a long time on selecting a proper explosion-proof box from a plurality of explosion-proof box bodies, but the prior art has one less part and can predict the highest surface temperature of an explosion-proof device in advance, so that the user can quickly select the explosion-proof box bodies suitable for the user to assemble the explosion-proof device when facing the explosion-proof box bodies.
Disclosure of Invention
The invention provides a method and a system for acquiring a highest surface temperature value of an explosion-proof device, and aims to solve the technical problem that a user cannot quickly select a proper one from a plurality of explosion-proof boxes in the prior art.
A method for obtaining the highest surface temperature value of an explosion-proof device comprises the following steps:
step A1, arranging temperature sensors at a plurality of temperature detection points on the outer surface of the explosion-proof box body, and arranging at least one resistor on the inner surface of the rear shell for temperature rise test;
step A2, providing an initial current value for the resistor, and collecting the surface temperature values of all temperature sensors after a preset time;
step A3, screening the acquired maximum temperature values from the acquired temperatures of all the temperature sensors;
step A4, subtracting the current environment temperature value from the screened maximum temperature value to obtain the maximum temperature rise value obtained by the current test;
a step a5 of calculating a power consumption value of the resistor based on the resistance value of the resistor and a value of a current flowing through the resistor;
step A6, adjusting the current value provided to the resistor, repeating the steps A2-A5, obtaining a plurality of groups of test data, wherein each group of test data comprises the power consumption value of the resistor and the maximum temperature rise value obtained by the corresponding test, and processing the groups of test data to obtain the association relation.
Step A7, acquiring the power consumption value of each component, and performing accumulation calculation to obtain the total power consumption value of the components in the explosion-proof device;
a8, obtaining the highest surface temperature rise value of the explosion-proof device according to the total power consumption value and the incidence relation;
step A9, adding the highest surface temperature rise value of the explosion-proof device and a preset temperature value to obtain the highest surface temperature value of the explosion-proof device.
Further, in the step a6, performing curve fitting by using the obtained multiple groups of test data to obtain a fitting formula and storing the fitting formula, wherein the fitting formula and the type of the explosion-proof box body are correspondingly stored;
in step A8, the total power consumption value is substituted into a fitting formula to obtain the highest surface temperature rise value of the explosion-proof device.
Further, in the step a1, a scanning gun is used in advance to scan the outer surface of the real explosion-proof box body after the resistor is powered on according to the power module, and then a plurality of points with the surface temperature values ranked at the front are found out to be used as temperature detection points.
Further, in step a6, fitting is performed with the power consumption value of the resistor as an abscissa and the highest surface temperature rise value as an ordinate to obtain a fitting formula, wherein the fitting formula is in the form as follows:
y＝ax3+bx2+cx+d；
where x represents the power consumption value and y represents the maximum surface temperature rise value.
The system for acquiring the highest surface temperature value of the explosion-proof device is characterized by being applied to the method for acquiring the highest surface temperature value of the explosion-proof device, and comprises the following steps:
the explosion-proof device consists of an explosion-proof box body and a plurality of components to be arranged in the explosion-proof box body;
the explosion-proof box body comprises a cover door, a rear shell opposite to the cover door, an upper shell, a lower shell opposite to the upper shell, a left shell and a right shell opposite to the left shell;
a plurality of temperature detection points on the outer surface of the explosion-proof box body are respectively provided with a temperature sensor;
at least one resistor disposed on an inner surface of the rear case for temperature rise test;
the power supply module is connected with the resistor, is used for electrifying the resistor and applying currents with different magnitudes for multiple times to carry out temperature rise test, and is used for calculating the power consumption value of the resistor according to the resistance value of the resistor and the applied current value;
the surface temperature acquisition module is connected with each temperature sensor and is used for acquiring the surface temperature values of all the temperature sensors after the power supply module applies current to the resistor for a preset time each time;
the temperature screening module is connected with the temperature acquisition module and used for screening the acquired maximum temperature value from the temperatures of all the temperature sensors acquired each time;
the environment temperature acquisition module is used for acquiring the environment temperature of the current explosion-proof box body;
the temperature calculation module is respectively connected with the temperature screening module and the environment temperature acquisition module and is used for subtracting the environment temperature value from the screened maximum temperature value to obtain a maximum temperature rise value obtained by testing;
the data simulation module is used for acquiring a plurality of groups of test data when different current values are applied, wherein each group of test data comprises a power consumption value of the resistor and a maximum temperature rise value obtained by corresponding test, and processing the power consumption value and the maximum temperature rise value to obtain the incidence relation of the groups of test data;
the storage module is used for correspondingly storing the association relation and the type of the explosion-proof box body;
the total power consumption acquisition module is used for acquiring the power consumption value of each component and performing accumulation calculation to obtain the total power consumption value of the components arranged in the explosion-proof device;
the temperature rise calculation module is connected with the total power consumption calculation module and the storage module and is used for obtaining the highest surface temperature rise value of the explosion-proof device according to the total power consumption value and the incidence relation;
and the temperature adding module is connected with the temperature rise calculating module and is used for adding the highest surface temperature rise value of the explosion-proof device and a preset temperature value to obtain the highest surface temperature value of the explosion-proof device.
Further, the data simulation module is used for performing curve fitting on the obtained multiple groups of test data to obtain a fitting formula and storing the fitting formula;
and the temperature rise calculation module is used for substituting the total power consumption value into a fitting formula to obtain the highest surface temperature rise value of the explosion-proof device.
And the temperature measuring gun is used for scanning the outer surface of the real explosion-proof box body after the resistor is electrified according to the power supply module before the temperature sensor is installed to find out a plurality of points with surface temperature values ranking in front as temperature detecting points.
Further, the data simulation module is used for fitting by taking the power consumption value of the resistor as an abscissa and the highest surface temperature rise value as an ordinate to obtain a fitting formula, and the fitting formula is in the following form:
y＝ax3+bx2+cx+d；
where x represents the power consumption value and y represents the maximum surface temperature rise value.
Furthermore, the cover door, the rear shell, the upper shell, the lower shell, the left shell and the right shell of the explosion-proof box body are made of aluminum alloy materials or steel plates.
Furthermore, an area is cut off from the cover door to serve as a window, and transparent glass is arranged in the area.
The beneficial technical effects of the invention are as follows: according to the invention, a fitting formula of each type of explosion-proof box body is obtained in advance through temperature rise tests, then the total power consumption is determined according to the type and the number of components arranged in the explosion-proof box body, the environment temperature used by combining the highest surface temperature rise of the explosion-proof device using the explosion-proof box body is obtained according to the total power consumption and the fitting formula, the group of the explosion-proof device is determined, the different explosion-proof box bodies enable the group of the explosion-proof device to be different, and the purpose of quickly selecting the proper explosion-proof box body is realized by selecting the proper explosion-proof box body according to the.
Drawings
FIG. 1 is a schematic structural diagram of a resistor arranged on the inner surface of a rear shell of the flameproof box body;
FIG. 2 is a schematic block diagram of a system for acquiring a highest surface temperature value of an explosion suppression device according to the present invention;
FIG. 3 is a flow chart of steps of a method for obtaining a highest surface temperature value of an explosion suppression device according to the invention;
FIGS. 4-10 are fitting curve diagrams of different flameproof boxes made of aluminum alloy without glass according to the invention;
FIGS. 11-17 are fitting curve diagrams of different flameproof boxes made of aluminum alloy with glass according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 3, the invention provides a method for obtaining a highest surface temperature value of an explosion suppression device, which comprises the following steps:
step A1, arranging temperature sensors (14) at a plurality of temperature detection points on the outer surface of the explosion-proof box body (1), and arranging at least one resistor (2) on the inner surface of the rear shell for temperature rise test;
step A2, providing an initial current value for the resistor (2), and collecting surface temperature values of all temperature sensors (14) after a preset time;
a3, screening out the maximum temperature value obtained by collection from the obtained temperatures of all temperature sensors (14);
step A4, subtracting the current environment temperature value from the screened maximum temperature value to obtain the maximum temperature rise value obtained by the current test;
a step a5 of calculating a power consumption value of the resistor based on the resistance value of the resistor and a value of a current flowing through the resistor;
step A6, adjusting the current value provided for the resistor (2), repeating the steps A2-A5, obtaining a plurality of groups of test data, wherein each group of test data comprises the power consumption value of the resistor (2) and the maximum temperature rise value obtained by corresponding test, and processing the groups of test data to obtain the association relation.
Step A7, acquiring the power consumption value of each component, and performing accumulation calculation to obtain the total power consumption value of the components in the explosion-proof device;
a8, obtaining the highest surface temperature rise value of the explosion-proof device according to the total power consumption value and the incidence relation;
step A9, adding the highest surface temperature rise value of the explosion-proof device and a preset temperature value to obtain the highest surface temperature value of the explosion-proof device.
Further, in the step A6, curve fitting is carried out by using the obtained multiple groups of test data to obtain a fitting formula, and the fitting formula is stored, wherein the fitting formula and the type of the explosion-proof box body (1) are correspondingly stored;
in step A8, the total power consumption value is substituted into a fitting formula to obtain the highest surface temperature rise value of the explosion-proof device.
Further, in the step A1, a scanning gun is used in advance to scan the outer surface of the real explosion-proof box body (1) after the resistor (2) is electrified according to the power module, and a plurality of points with surface temperature values ranked in the front are found out to be used as temperature detection points.
Further, in step a6, fitting is performed with the power consumption value of the resistor (2) as an abscissa and the highest surface temperature rise value as an ordinate to obtain a fitting formula, which has the following form:
y＝ax3+bx2+cx+d；
where x represents the power consumption value and y represents the maximum surface temperature rise value.
Referring to fig. 1-2, the invention provides a system for obtaining a highest surface temperature value of an explosion-proof device, which is applied to the method for obtaining the highest surface temperature value of the explosion-proof device, and comprises the following steps:
the explosion-proof device consists of an explosion-proof box body and a plurality of components to be arranged in the explosion-proof box body (1);
the explosion-proof box body (1), the explosion-proof box body (1) includes the cover door, the back shell opposite to cover door, the upper shell, the lower shell opposite to upper shell, the left shell and the right shell opposite to left shell;
a plurality of temperature detection points on the outer surface of the explosion-proof box body (1) are respectively provided with a temperature sensor (14);
at least one resistor (2) arranged on the inner surface of the rear shell for temperature rise test;
the power supply module (3) is connected with the resistor (2), is used for electrifying the resistor (2) and applying currents with different magnitudes for multiple times to carry out temperature rise test, and is used for calculating the power consumption value of the resistor according to the resistance value of the resistor and the applied current value;
the surface temperature acquisition module (4) is connected with each temperature sensor (14) and is used for acquiring the surface temperature values of all the temperature sensors after the power module (3) applies current to the resistor (2) for a preset time each time;
the temperature screening module (5) is connected with the surface temperature acquisition module (4) and is used for screening the acquired maximum temperature value from the temperatures of all the temperature sensors acquired each time;
the environment temperature acquisition module (6) is used for acquiring the environment temperature of the current explosion-proof box body;
the temperature calculation module (7) is respectively connected with the temperature screening module (5) and the environment temperature acquisition module (6) and is used for subtracting the environment temperature value from the screened maximum temperature value to obtain a maximum temperature rise value obtained by testing;
the data simulation module (9) is used for acquiring a plurality of groups of test data when different current values are applied, each group of test data comprises a power consumption value of the resistor and a maximum temperature rise value obtained by corresponding test, the incidence relation of the groups of test data is obtained through processing, and preferably, the groups of test data are used for carrying out curve fitting to obtain a fitting formula;
the storage module (10) is used for correspondingly storing the association relation and the type of the explosion-proof box body (1), preferably, the fitting formula and the type of the explosion-proof box body;
the total power consumption acquisition module (11) is used for acquiring the power consumption value of each component and performing accumulation calculation to obtain the total power consumption value of the components in the explosion-proof device;
the temperature rise calculating module (12) is connected with the total power consumption calculating module (11) and the storage module (12), is used for obtaining the highest surface temperature rise value of the explosion-proof device according to the total power consumption value and the incidence relation, and is preferably used for substituting the total power consumption value into a fitting formula to obtain the highest surface temperature rise value of the explosion-proof device;
and the temperature adding module (13) is connected with the temperature rise calculating module (14) and is used for adding the highest surface temperature rise value of the explosion-proof device and a preset temperature value to obtain the highest surface temperature value of the explosion-proof device.
Specifically, the group of the explosion-proof device can be determined according to the maximum surface temperature value of the explosion-proof device and the temperature group into which the electrical equipment is divided according to the maximum surface temperature.
And further, the temperature measuring gun is further included and used for scanning the outer surface of the real explosion-proof box body (1) to find out a plurality of points with surface temperature values ranked in the front as temperature detecting points after the resistor (2) is electrified according to the power module (3) before the temperature sensor (14) is installed.
Furthermore, the cover door, the rear shell, the upper shell, the lower shell, the left shell and the right shell of the explosion-proof box body (1) are made of aluminum alloy materials or steel plates.
Furthermore, an area is cut off from the cover door to serve as a window, and transparent glass is arranged in the area.
Further, the data simulation module (9) is used for fitting by taking the power consumption value of the resistor as an abscissa and the highest surface temperature rise value as an ordinate to obtain a fitting formula, and the form of the fitting formula is as follows:
y＝ax3+bx2+cx+d；
where x represents the power consumption value and y represents the maximum surface temperature rise value.
Furthermore, the flameproof box body (1) is vertically installed during temperature rise test, the installation assembly of the flameproof box body (1) is arranged on the outer surface of the rear shell, and the cover door and the rear shell are vertically arranged.
Further, a resistor (2) is provided at an intermediate position of the inner surface of the rear case.
Further, the data simulation module (9) is used for carrying out curve fitting by using the six groups of test data to obtain a fitting formula.
Specifically, a series of flame-proof type distribution boxes with the same structure but different sizes are subjected to power consumption temperature rise method test, a temperature rise fitting formula of each flame-proof type distribution box is obtained through simulation, then, for specific built-in components, namely the sum of the types and the number of the components which are required to be installed in the flame-proof type distribution boxes by users, the power consumption of the components is accumulated to obtain the total power consumption, the total power consumption is brought into the temperature rise fitting formula, and the highest surface temperature rise value of a flame-proof device composed of the flame-proof type distribution boxes and the built-in components is obtained through calculation, so that the highest surface temperature rise value of the flame-proof device composed of the built-in components of the flame-proof type distribution boxes of various types can be determined, the temperature group of each flame-proof device is.
Specifically, because the block terminal need install the display screen and or ammeter etc. in the in-service use process, just need excise an area on the lid and then install a transparent glass board and observe the reading, because the coefficient of heat conductivity of glass and aluminium material or steel sheet material is different, when installing the components and parts of a mould, the aluminium alloy that takes glass and does not take glass and its highest surface temperature rise of steel sheet material just have certain difference, consequently, the flameproof block terminal kind that belongs to different of taking glass and not taking glass, need separately to test and obtain respective fitting formula.
Specifically, the mounting means of block terminal is vertical installation, and one of them vertical mounting means is installed according to the mounting means of block terminal, and generally built-in components and parts set up on the internal surface of the back casing of block terminal, so the installation component setting of flame proof box (1) covers the vertical setting of door and back casing at the surface of back casing. Preferably, the face with the smallest area is used as the lower case. The resistor is mounted in the middle of the inner surface of the rear housing and against the bottom of the housing. And then electrifying and setting current, scanning the outer surface of the whole shell by using a temperature measuring gun for a period of time to find out a plurality of points with the highest temperature, arranging a temperature sensor on the points, so that the temperature data value can be directly transmitted to a computer, reading and recording the power consumption value at the moment from a power supply instrument for supplying power after the temperature data is stable, reading the highest surface temperature value of the temperature sensor from the computer, and using the value to be different from the current environment temperature value to obtain the value with the largest difference as the highest surface temperature rise value of the temperature sensor, so that a group of power consumption value and the highest surface temperature rise value are obtained. The current value is adjusted and the above process is repeated to obtain a plurality of sets of test data, such as 6 sets of power consumption and the highest surface temperature rise value. The explosion-proof box body of another type is tested according to the process, and multiple groups of test data of different types of distribution boxes are obtained, and the test data are shown in tables 1 and 2.
Specifically, data simulation software is adopted to analyze the relationship between the power consumption and the highest surface temperature rise value, specifically, the data simulation software is Matlab, 6 groups of data of each shell are input into Matlab, then a cftool kit is fitted by using cftool data, the power consumption is used as an abscissa, the highest surface temperature rise value is used as an ordinate, the data are led into a coordinate system as point coordinates, as shown in FIGS. 5-17, 6 points can be known to fall near a straight line, environmental factors such as air are considered, and in order to enable a fitted curve to be closer to one point with the actually measured 6 points, a function model is preferably adopted for fitting for 3 times to obtain a fitting formula.
Specifically, the power consumption of each component may be obtained in various manners, for example, the resistance of the component may be obtained by detecting data by a third party, or by manufacturer marking data, or by measuring data actually by itself. Then according to P ═ I2And R can obtain the supply of the components. And part of component manufacturers directly mark power consumption and can directly use the power consumption. And listing all components needing to be installed in the explosion-proof box, accumulating the power consumption of each component to obtain the total power consumption, then selecting the type of the explosion-proof box, namely selecting a fitting formula of the explosion-proof box, and automatically calculating the highest surface temperature rise value of an explosion-proof device formed by the configured components, thereby determining the temperature group in the explosion-proof mark.
The test data of the flameproof box body with different temperature rise and power consumption data of the flameproof box body made of the aluminum alloy material without glass are shown in table 1, and the fitted curve chart is shown in fig. 5-11.
The test data of the flameproof box body with the glass and the aluminum alloy material, which has different temperature rise and power consumption data, are shown in table 1, and the fitted curve graph is shown in fig. 12-17.
TABLE 1 temperature rise and power consumption data of explosion-proof box body made of aluminum alloy without glass
For the fitting formula of the different flameproof boxes made of aluminum alloy materials without glass in table 1, the fitting formula with the I-shaped box is as follows:
y＝4.059*10-6*x3-0.001679*x2+0.5241*x-0.1882；
the fitting formula of the box body with the code number of II is as follows:
y＝1.012*10-6*x3-0.0006612*x2+0.3898*x-0.4223；
the fitting formula of the box with the code number of III is as follows:
y＝5.728*10-7*x3-0.0004167*x2+0.3079*x-0.1723；
the fitting formula of the box with the code number of IV is as follows:
y＝1.394*10-7*x3-0.0001903*x2+0.2116*x-0.7393；
the fitting formula of the box with the code number of V is as follows:
y＝7.338*10-8*x3-0.0001125*x2+0.1598*x-0.4827；
the fitting formula of the VI-type box body is as follows:
y＝4.946*10-8*x3-0.00009065*x2+0.1345*x-0.4476；
the fitting formula of the VII-type box body is as follows:
y＝2.362*10-8*x3-0.00004161*x2+0.08901*x-0.09072；
TABLE 2 temperature rise and Power consumption data of the flameproof case made of aluminum alloy with glass
For the fitting formulas of different flameproof boxes made of aluminum alloy materials with glass in the table 2, the fitting formula with the I-shaped box is as follows:
y＝4.444*10-7*x3-0.0006845*x2+0.5163*x-0.4273；
the fitting formula of the box body with the code number of II is as follows:
y＝1.005*10-6*x3-0.0008671*x2+0.4792*x-0.02094；
the fitting formula of the box with the code number of III is as follows:
y＝9.431*10-7*x3-0.0006803*x2+0.3792*x-0.6912；
the fitting formula of the box with the code number of IV is as follows:
y＝3.186*10-7*x3-0.0003466*x2+0.2747*x-0.4825；
the fitting formula of the box with the code number of V is as follows:
y＝1.598*10-7*x3-0.0002103*x2+0.2139*x-0.3149；
the fitting formula of the VI-type box body is as follows:
y＝7.562*10-8*x3-0.00003466*x2+0.1244*x-0.2778；
the fitting formula of the VII-type box body is as follows:
y＝1.581*10-8*x3-0.00002499*x2+0.08958*x-0.2783。
referring to fig. 3-4, the invention further provides a method for obtaining a highest surface temperature value of a flameproof device, which is characterized in that the system for obtaining the highest surface temperature value of the flameproof device is used, the flameproof device comprises a flameproof box body (1), and the flameproof box body comprises a cover door, a rear shell opposite to the cover door, an upper shell, a lower shell opposite to the upper shell, a left shell and a right shell opposite to the left shell;
the temperature rise test step comprises:
step A1, arranging temperature sensors (14) at a plurality of temperature detection points on the outer surface of the explosion-proof box body (1), and arranging at least one resistor (2) on the inner surface of the rear shell for temperature rise test;
step a2, providing an initial current value to a resistor;
step A3, collecting surface temperature values of all temperature sensors after a preset time;
step A4, screening the acquired maximum temperature values from the acquired temperatures of all the temperature sensors;
step A5, subtracting the current environment temperature value from the screened highest surface temperature value to obtain the maximum temperature rise value obtained by the current test;
a step a5 of calculating a power consumption value of the resistor based on the resistance value of the resistor and a value of a current flowing through the resistor;
step A6, adjusting the current value provided for the resistor, repeating the steps A1-A5, obtaining multiple groups of test data, wherein each group of test data comprises the power consumption value of the resistor and the maximum temperature rise value obtained by corresponding test, performing curve fitting by using the groups of test data to obtain a fitting formula, and storing the fitting formula, wherein the fitting formula and the type of the explosion-proof box body are correspondingly stored;
the temperature group determining step of the explosion-proof device comprises the following steps:
b1, acquiring the power consumption value of each component, and performing accumulation calculation to obtain the total power consumption value of the components in the explosion-proof device;
b2, substituting the total power consumption value into a fitting formula to obtain the highest surface temperature rise value of the explosion suppression device;
b3, comparing the highest surface temperature value of the explosion suppression device with each boundary temperature of a preset standard temperature group to determine the temperature group of the explosion suppression device;
further, in the step a1, a scanning gun is used in advance to scan the outer surface of the real explosion-proof box body after the resistor is powered on according to the power module, and then a plurality of points with the surface temperature values ranked at the front are found out to be used as temperature detection points.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A method for obtaining the highest surface temperature value of an explosion-proof device is characterized by comprising the following steps:
step A1, arranging temperature sensors at a plurality of temperature detection points on the outer surface of the flameproof box body, and arranging at least one resistor on the inner surface of the rear shell for temperature rise test;
step A2, providing an initial current value for the resistor, and collecting the surface temperature values of all the temperature sensors after a preset time;
step A3, screening out the maximum temperature value obtained by collection from the obtained temperatures of all the temperature sensors;
step A4, subtracting the current environment temperature value from the screened maximum temperature value to obtain the maximum temperature rise value obtained by the current test;
a step a5 of calculating a power consumption value of the resistor from a resistance value of the resistor and a value of a current flowing through the resistor;
step A6, adjusting the current value provided to the resistor, repeating steps A2-A5, obtaining a plurality of groups of test data, wherein each group of test data comprises the power consumption value of the resistor and the maximum temperature rise value obtained by corresponding test, and processing the groups of test data to obtain an association relation.
Step A7, acquiring the power consumption value of each component, and performing accumulation calculation to obtain the total power consumption value of the components in the explosion-proof device;
a8, obtaining the highest surface temperature rise value of the explosion suppression device according to the total power consumption value and the incidence relation;
and A9, adding the highest surface temperature rise value of the explosion-proof device and a preset temperature value to obtain the highest surface temperature value of the explosion-proof device.
2. The method for obtaining the highest surface temperature value of the flameproof device according to claim 1, wherein in the step A6, curve fitting is performed by using the obtained multiple groups of test data to obtain a fitting formula, and the fitting formula is stored, wherein the fitting formula is stored in correspondence with the type of the flameproof box body;
in the step A8, the total power consumption value is substituted into the fitting formula to obtain the highest surface temperature rise value of the flameproof device.
3. The method for obtaining the highest surface temperature value of the flameproof device according to claim 1, wherein in step A1, a scanning gun is used in advance to scan the outer surface of a real flameproof box body after a power module energizes a resistor to find out a plurality of points with surface temperature values ranked in the front as the temperature detection points.
4. The method for obtaining the highest surface temperature value of the flameproof device according to claim 2, wherein in the step a6, the fitting is performed by taking the power consumption value of the resistor as an abscissa and the highest surface temperature rise value as an ordinate to obtain the fitting formula, and the fitting formula has the following form:
y＝ax3+bx2+cx+d；
where x represents the power consumption value and y represents the maximum surface temperature rise value.
5. A highest surface temperature value obtaining system of an explosion-proof device is characterized in that the highest surface temperature value obtaining method applied to the explosion-proof device according to any one of claims 1 to 4 comprises the following steps:
the explosion-proof device consists of an explosion-proof box body and a plurality of components to be arranged in the explosion-proof box body;
the explosion-proof box body comprises a cover door, a rear shell opposite to the cover door, an upper shell, a lower shell opposite to the upper shell, a left shell and a right shell opposite to the left shell;
a plurality of temperature detection points on the outer surface of the explosion-proof box body are respectively provided with a temperature sensor;
at least one resistor arranged on the inner surface of the rear shell for temperature rise test;
the power supply module is connected with the resistor, is used for electrifying the resistor and applying currents with different magnitudes for multiple times to carry out temperature rise test, and is used for calculating the power consumption value of the resistor according to the resistance value of the resistor and the applied current value;
the surface temperature acquisition module is connected with each temperature sensor and is used for acquiring the surface temperature values of all the temperature sensors after the power supply module applies current to the resistor for a preset time each time;
the temperature screening module is connected with the temperature acquisition module and is used for screening the acquired maximum temperature value from the temperatures of all the temperature sensors acquired each time;
the environment temperature acquisition module is used for acquiring the current environment temperature of the explosion-proof box body;
the temperature calculation module is respectively connected with the temperature screening module and the environment temperature acquisition module and is used for subtracting the environment temperature value from the screened maximum temperature value to obtain a maximum temperature rise value obtained by testing;
the data simulation module is used for acquiring a plurality of groups of test data when different current values are applied, wherein each group of test data comprises a power consumption value of the resistor and the maximum temperature rise value obtained by corresponding test, and processing the test data to obtain the incidence relation of the groups of test data;
the storage module is used for correspondingly storing the association relation and the type of the explosion-proof box body;
the total power consumption acquisition module is used for acquiring the power consumption value of each component and performing accumulation calculation to obtain the total power consumption value of the components arranged in the explosion-proof device;
the temperature rise calculation module is connected with the total power consumption calculation module and the storage module and is used for obtaining the highest surface temperature rise value of the explosion-proof device according to the total power consumption value and the incidence relation;
and the temperature adding module is connected with the temperature rise calculating module and is used for adding the highest surface temperature rise value of the explosion-proof device and a preset temperature value to obtain the highest surface temperature value of the explosion-proof device.
6. The system for acquiring the highest surface temperature value of the explosion-proof device according to claim 5, wherein the data simulation module is used for performing curve fitting on the acquired multiple groups of test data to obtain a fitting formula and storing the fitting formula;
and the temperature rise calculation module is used for substituting the total power consumption value into the fitting formula to obtain the highest surface temperature rise value of the explosion-proof device.
7. The system for acquiring the highest surface temperature value of the flameproof device according to claim 5, further comprising a temperature measuring gun for scanning the outer surface of the real flameproof box body to find out a plurality of points with surface temperature values ranked in the front as the temperature detection points according to the power module after the resistor is powered on before the temperature sensor is installed.
8. The system for acquiring the highest surface temperature value of the flameproof device according to claim 6, wherein the data simulation module is configured to perform fitting to obtain the fitting formula by using the power consumption value of the resistor as an abscissa and the highest surface temperature rise value as an ordinate, and the fitting formula is in the following form:
y＝ax3+bx2+cx+d；
where x represents the power consumption value and y represents the maximum surface temperature rise value.
9. The system for acquiring the highest surface temperature value of the flameproof device according to claim 5, wherein the cover door, the rear shell, the upper shell, the lower shell, the left shell and the right shell of the flameproof box body are made of aluminum alloy materials or steel plates.
10. The system for acquiring the highest surface temperature value of the flameproof device according to claim 5, wherein an area is cut off from the cover door to serve as a window, and transparent glass is installed in the area.
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