CN113466411B - Relative humidity detection equipment and method for airtight packaging box - Google Patents
Relative humidity detection equipment and method for airtight packaging box Download PDFInfo
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Abstract
The invention relates to relative humidity detection equipment and a relative humidity detection method of an airtight packing box, and relates to relative humidity detection method and relative humidity detection equipment, which comprise a sensor 1, a processor 2, a display 3 and an equipment shell 4, wherein the sensor 1 is connected with the processor 2, the processor 2 is connected with the display 3, and the sensor 1 and the display 3 are connected with the equipment shell 4. The invention can convert the humidity in the box into the relative humidity expression value corresponding to the standard temperature and store the relative humidity expression value permanently through matching with the structure and the seal of the airtight packing box, thereby being convenient for detecting the relative humidity in the packing box for a long period.
Description
Technical Field
The invention relates to a relative humidity detection device and method for an airtight packing box, in particular to a relative humidity detection method and device for an airtight packing box.
Background
The airtight packing box adopting the sealing measure forms a relatively stable temperature, humidity and pressure microenvironment in the box body, thereby avoiding the exchange with the air outside the packing box. The high-concentration nitrogen gas with certain pressure is filled into the airtight packaging box, so that a reliable environment is provided for storing valuables such as precise instruments, precious relics and the like, the probability of oxidizing and electrochemical corrosion of the commodities is reduced, and the stored commodities are effectively protected. In general, humidity indexes in a packaging box are important parameters of general concern, and the conditions of short circuit, corrosion and the like are easy to occur when the humidity is too high, so that electronic components in the box are affected with damp; too low a humidity can increase electrostatic adhesion of the electronic components, which can present a risk of electrical breakdown, memory erasure for the integrated circuit. Along with the development of microelectronic technology, the gas humidity collection in the packaging box is developed from the traditional reading mode of a color chart and a mechanical hygrometer to the direction of multi-parameter, integrated and digital sensors. The chip type sensor can effectively collect indexes such as temperature, relative humidity, absolute pressure and the like in the current environment in the packaging box through devices integrated with different functions. However, the microenvironment in the packaging box is affected by the change of the external environment, for example, the increase of the ambient temperature can lead to the increase of the temperature in the box, and as the relatively stable airtight microenvironment is established in the packaging box, the change of the temperature also causes the change of the relative humidity and the absolute pressure, so that the humidity parameter collection in the packaging box is in a continuously changing range, and the long-period detection and the super-threshold alarm of the nitrogen humidity are not facilitated. Therefore, a method and a device for detecting relative humidity of an airtight packing box are needed, and a temperature-humidity-pressure conversion model is embedded in a processor to convert the relative humidity collected by a sensor into the relative humidity corresponding to the same temperature value and display the relative humidity on the device, so that the long-period detection and state control of the relative humidity in the packing box are facilitated.
Disclosure of Invention
The invention aims to provide a relative humidity detection device and a relative humidity detection method for an airtight packaging box, so as to obtain the relative humidity in the airtight packaging box.
An airtight packing box relative humidity detection device comprises a sensor 1, a processor 2, a display 3 and a device shell 4, wherein the sensor 1 is connected with the processor 2, the processor 2 is connected with the display 3, the sensor 1 and the display 3 are connected with the device shell 4, and the airtight packing box relative humidity detection device is characterized in that,
the sensor 1 comprises a temperature and humidity sensor 5, an absolute pressure sensor 6, a feed-through filter 7 and a fixed bracket 8, wherein the feed-through filter 7 further comprises a power supply pin 9 and a communication pin 10; the temperature and humidity sensor 5, the absolute pressure sensor 6 and the feed-through filter 7 are respectively and fixedly connected to the fixed bracket 8; the I2C communication pins of the temperature and humidity sensor 5 and the absolute pressure sensor 6 are electrically connected with the input end of the communication pin 10 of the feed-through filter 7, and the power supply pins of the temperature and humidity sensor 5 and the absolute pressure sensor 6 are electrically connected with the output end of the power supply pin 9 of the feed-through filter 7; after the power supply of each sensor is carried out through the power pin 9 of the feed-through filter 7, collected data is output to the processor 2 in an airtight manner through the communication pin 10 of the feed-through filter 7;
the processor 2 comprises an I2C interface 11, a parameter temporary storage area 12, a model conversion area 13, a data storage area 14 and an interaction interface 15, wherein the I2C interface 11, the parameter temporary storage area 12, the model conversion area 13, the data storage area 14 and the interaction interface 15 are electrically connected through electric signals, and the output end of the I2C interface 11 is electrically connected with the input end of the parameter temporary storage area 12 to form temporary storage parameters for ambient temperature, relative humidity and absolute pressure; the output end of the parameter temporary storage area 12 is electrically connected with the input end of the data storage area 14 through the model conversion area 13, the temporary storage parameters are converted to form storage parameters in the data storage area 14, and the output end of the data storage area 14 is electrically connected with the input end of the interaction interface 15; the interaction interface 15 is connected with the display 3;
the display 3 comprises a receiver 17, a memory 18 and an interactive screen 19, wherein the output end of the receiver 17 is electrically connected with the interactive screen 19 through the memory 18, the memory 18 stores received data, and simultaneously receives user calling information of the interactive screen 19 and displays the data in the interactive screen 19;
the device housing 4 includes a structural shell 20, a seal groove 21, and mounting threads 22. The seal groove 21 is embedded on the structural housing 20 in the form of a machined groove for assembling an O-ring seal; the mounting threads 22 are threaded on the structural shell 20 for secure connection with the package box nut;
the fixed bracket 8 in the sensor 1 is mechanically connected with the structural shell 20 in the equipment shell 4 in a threaded fastening mode, and the fixed bracket 8 is fixed inside the structural shell 20; the interactive screen 19 in the display 3 is mechanically connected with the structural shell 20 in the device shell 4 in an embedded mode, and the interactive screen 19 is embedded outside the structural shell 20; the input end of a power pin 9 and the output end of a communication pin 10 of a feed-through filter 7 in the sensor 1 are respectively and electrically connected with the input end of an I2C interface 11 in the processor 2, and the temperature, relative humidity and absolute pressure data acquired by the sensor 1 are received and simultaneously power is supplied to the sensor 1; the output of the interaction interface 15 in the processor 2 is electrically connected to the input of the receiver 17 in the display 3, outputting the stored parameters to the display 3.
A method for detecting relative humidity of an airtight packing box is characterized in that,
step one, the airtight packing box relative humidity detection equipment of claim 1 is connected with an airtight packing box interface in an airtight manner through an O-shaped sealing ring and a mounting nut, and the ambient temperature T in the packing box is collected 0 Collecting current relative humidity RH in the packaging box 0 Collecting absolute pressure P in packing box 0 The method comprises the steps of carrying out a first treatment on the surface of the Set at a standard temperature T b The relative humidity is RH b Standard temperature T b Absolute pressure at P b The method comprises the steps of carrying out a first treatment on the surface of the The nitrogen in the packaging box is relatively stable in an airtight state, and the environment of the ideal state of the Ke-La-Bo-Dragon is met, so that the nitrogen in the packaging box meets the following conditions:
step two, establishing an enthalpy and humidity state model, and establishing a state model of the enthalpy and humidity d of nitrogen in the packaging box, wherein the state model meets the equation:
wherein P is S Is the saturated vapor pressure of nitrogen in the tank at the current temperature, M q M is the molar mass of nitrogen in the tank p Is the molar mass of the water vapor;
and thirdly, establishing an enthalpy and humidity constant model. Establishing a constant model of the enthalpy and humidity of the nitrogen state in the packaging box, namely the enthalpy and humidity d of the nitrogen at the current temperature 0 Moisture content d with standard temperature nitrogen enthalpy b Equal; it can be known that:
(273.15+T 0 )·RH b ·P Sb ＝(273.15+T b )·RH 0 ·P S0 wherein P is Sb At a standard temperature T b Saturated water pressure of nitrogen in lower box, P S0 Is T 0 Saturated water pressure of nitrogen in the box at the temperature;
fitting a relation equation of temperature and saturated water pressure, and under a standard atmospheric pressure environment, carrying out data analysis and relation fitting on the relation of saturated water pressure and temperature at the temperature of-10 ℃ to +40 ℃ by MATLAB to obtain a corresponding saturated water pressure P at the temperature T ST Expressed as a second order equation:
P ST ＝3.3·T 2 +30·T+490
calculating to obtain a relative humidity expression value: formula integration is carried out, and the airtight packaging box is output at any temperature T 0 Relative humidity RH below 0 Conversion to Standard temperature T b Relative humidity RH below b Can be expressed as:
in the formula, RH 0 、T 0 Collecting the ambient temperature T in the packaging box for the sensor received by the processor 0 And the current relative humidity RH 0 ，T b To need to turnChanging standard temperature; substituting the related parameters into the above formula to obtain RH b Is a numerical value of (2).
The invention has the advantages that: the method and the equipment for detecting the relative humidity of the airtight packing box can convert the humidity in the airtight packing box into a relative humidity expression value corresponding to the standard temperature through matching with the structure and the sealing of the airtight packing box and permanently store the relative humidity expression value, thereby being convenient for detecting the relative humidity in the packing box for a long period.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram showing the connection state of the airtight packing box;
FIG. 3 is a schematic view of a device housing and airtight package of the present invention partially in section;
FIG. 4 is a block diagram of the electrical principle of the present invention;
FIG. 5 is a flow chart of the method of the present invention.
The system comprises a sensor 1, a processor 3, a display 4, a device housing 5, a temperature and humidity sensor 6, an absolute pressure sensor 7, a feed-through filter 8, a fixed support 9, a power supply pin 10, a communication pin 11, an I2C interface 12, a parameter temporary storage area 13, a model conversion area 14, a data storage area 15, an interaction interface 16, a conversion method 17, a receiver 18, a storage 19, an interaction screen 20, a structural shell 21, a sealing groove 22, mounting threads 23, an airtight package outer wall, 24 and an airtight package inner wall.
Detailed Description
A method and equipment for detecting relative humidity of an airtight packing box comprise a sensor 1, a processor 2, a display 3 and an equipment shell 4.
The sensor comprises: temperature and humidity sensor 5, absolute pressure sensor 6, feed-through filter 7, fixed bolster 8, feed-through filter still includes power pin 9 and communication pin 10. The temperature and humidity sensor 5, the absolute pressure sensor 6 and the feed-through filter 7 are mechanically connected with the fixed bracket 8 in a threaded fastening mode. The I2C communication pins of the temperature and humidity sensor 5 and the absolute pressure sensor 6 are electrically connected with the input end of the communication pin 10 of the feed-through filter 7, and the power supply pins of the temperature and humidity sensor 5 and the absolute pressure sensor 6 are electrically connected with the output end of the power supply pin 9 of the feed-through filter 7. After the power supply of each sensor is carried out through the power supply pin 9 of the feed-through filter 7, collected data is output in an airtight manner through the communication pin 10 of the feed-through filter 7.
The processor 2 includes: the I2C interface 11, the parameter temporary storage area 12, the model conversion area 13, the data storage area 14 and the interactive interface 15, wherein the model conversion area 13 also comprises a conversion method 16. The parts are electrically connected by electrical signals. The output end of the I2C interface 11 is electrically connected with the input end of the parameter temporary storage area 12, and temporary storage parameters are formed by the ambient temperature, the relative humidity and the absolute pressure. The output end of the parameter temporary storage area 12 is electrically connected with the input end of the data storage area 14 through the model conversion area 13, and the temporary storage parameters are converted according to the conversion method 16 to form storage parameters in the data storage area 14. The output end of the data storage area 14 is electrically connected with the input end of the interaction interface 15 for outputting the stored parameters.
The conversion method 16 converts the ambient temperature T, the relative humidity RH, and the absolute pressure P to obtain the relative humidity at the standard temperature value, and includes five steps:
step S101, obtaining environmental parameters. Collecting the temperature T of the environment in the packaging box 0 Collecting current relative humidity RH in the packaging box 0 Collecting absolute pressure P in packing box 0 The method comprises the steps of carrying out a first treatment on the surface of the Let the standard temperature be T b Relative humidity at standard temperature of RH b Absolute pressure at standard temperature P b . The nitrogen in the packaging box is relatively stable under the airtight state, the environment of the ideal state of the Ke-La-Bo-Dragon is met, and the nitrogen in the packaging box meets the following conditions:
and step S102, establishing an enthalpy and humidity state model. Establishing a state model of the enthalpy and humidity d of nitrogen in the packaging box, and meeting the following equation:
wherein P is S Is the saturated vapor pressure of nitrogen in the tank at the current temperature, M q M is the molar mass of nitrogen in the tank p Is the molar mass of the water vapor.
And step three S103, establishing an enthalpy-humidity constant model. Establishing a constant model of the enthalpy and humidity of the nitrogen state in the packaging box, namely the enthalpy and humidity d of the nitrogen at the current temperature 0 Moisture content d with standard temperature nitrogen enthalpy b Equal. It can be known that:
(273.15+T 0 )·RH b ·P Sb ＝(273.15+T b )·RH 0 ·P S0 wherein P is Sb At a standard temperature T b Saturated water pressure of nitrogen in lower box, P S0 Is T 0 Saturated water pressure of nitrogen in the box at temperature.
And step four, S104, fitting a relation equation of temperature and saturated water pressure. Under the standard atmospheric pressure environment, carrying out data analysis and relation fitting on the relation between saturated water pressure and temperature at the temperature of minus 10 ℃ to +40 ℃ by using MATLAB, and obtaining the corresponding saturated water pressure P at the temperature T ST Expressed as a second order equation:
P ST ＝3.3·T 2 +30·T+490
and step five, S105, obtaining a relative humidity expression value. Formula integration is carried out, and the airtight packaging box is output at any temperature T 0 Relative humidity RH below 0 Conversion to Standard temperature T b Relative humidity RH below b Can be expressed as:
in the formula, RH 0 、T 0 Collecting the ambient temperature T in the packaging box for the sensor received by the processor 0 And the current relative humidity RH 0 ，T b Is the standard temperature that requires conversion. Substituting the related parameters into the above formula to obtain RH b Is a numerical value of (2).
The display 3 includes: a receiver 17, a memory 18 and an interactive screen 19. The output end of the receiver 17 is electrically connected with the interactive screen 19 through the memory 18, stores the received data, and simultaneously receives user calling information of the interactive screen 19 and displays the data in the interactive screen 19.
The apparatus housing 4 includes: a structural shell 20, a sealing groove 21 and mounting threads 22. The sealing groove 21 is embedded in the structural housing 20 in the form of a machined groove for the fitting of an O-ring. The mounting threads 22 are threaded onto the structural shell 20 for secure connection with the package nut.
The fixing bracket 8 in the sensor 1 is mechanically connected with the structural shell 20 in the device shell 4 in a threaded fastening manner, and the fixing bracket 8 is fixed inside the structural shell 20. The interactive screen 19 in the display 3 is mechanically connected to the structural housing 20 in the device housing 4 by means of an embedding, the interactive screen 19 being embedded outside the structural housing 20. The input end of a power pin 9 and the output end of a communication pin 10 of a feed-through filter 7 in the sensor 1 are respectively and electrically connected with the input end of an I2C interface 11 in the processor 2, and the temperature, relative humidity and absolute pressure data acquired by the sensor 1 are received and simultaneously power is supplied to the sensor 1. The output of the interaction interface 15 in the processor 2 is electrically connected to the input of the receiver 17 in the display 3, outputting the stored parameters to the display 3.
When the user uses the device, first, an O-ring is assembled on the seal groove 21 of the device housing 4, and is fastened to the airtight packing box through the mounting screw thread 22, and the structural housing 20 is integrated with the airtight packing box. After the airtight packing box is filled with high-purity nitrogen with certain pressure, the high-purity nitrogen is selected and detected in an interactive screen 19 of a display 3 of the equipment, and each electronic module in the equipment is electrified. The temperature and humidity sensor 5 and the absolute pressure sensor 6 in the sensor 1 store the acquired parameters in the parameter temporary storage area 12 through the I2C interface 11 of the processor 2 by the feed-through filter 7. The temporary storage area parameters are converted in the model conversion area 13 according to a conversion method 16: s101, calling environment parameters; step S102, establishing an enthalpy and humidity state model; step three S103, establishing an enthalpy and humidity constant model; step four, S104, fitting a relation equation of temperature and saturated water pressure; and step five, S105, obtaining a relative humidity expression value. The relative humidity expression values are buffered in the data storage area 14 and connected via the interaction interface 15 to the receiver 17 of the display 3, and finally permanently stored in the memory 18. The user can call in the interactive screen 19 of the display 3 according to the requirement, and the change trend of the relative humidity of the nitrogen in the packaging box after conversion at the standard temperature is seen.
The specific design scheme is as follows:
the sensor collects temperature, relative humidity and absolute pressure parameters in the packaging box in real time and outputs data in an airtight mode through the feed-through filter, the data are converted in the processor combination according to a preset model, and the data are input to the display for man-machine interaction according to the relative humidity value at the standard temperature. The device realizes the conversion of the relative humidity in the airtight packing box at the same standard temperature, and is convenient for long-period detection and problem data tracing.
A method and equipment for detecting relative humidity of airtight packing box is composed of sensor, processor, display and casing.
The sensor comprises: temperature and humidity sensor, absolute pressure sensor, feed-through filter, fixed bolster, feed-through filter still includes power pin and communication pin. The temperature and humidity sensor, the absolute pressure sensor and the feed-through filter are mechanically connected with the fixed bracket in a threaded fastening mode. The I2C communication pins of the temperature and humidity sensor and the absolute pressure sensor are electrically connected with the input ends of the communication pins of the feed-through filter, and the power supply pins of the temperature and humidity sensor and the absolute pressure sensor are electrically connected with the output ends of the power supply pins of the feed-through filter. After the power of each sensor is supplied by the power pin of the feed-through filter, the collected data is output in an airtight manner by the communication pin of the feed-through filter.
The processor comprises: I2C interface, parameter temporary storage area, model conversion area, data storage area, interactive interface, model conversion area also includes conversion method. The parts are electrically connected by electrical signals. The I2C interface output end is electrically connected with the parameter temporary storage area input end, and temporary storage parameters are formed by the ambient temperature, the relative humidity and the absolute pressure. The output end of the parameter temporary storage area is electrically connected with the input end of the data storage area through the model conversion area, and the temporary storage parameters are converted according to the conversion method to form storage parameters in the data storage area. The output end of the data storage area is electrically connected with the input end of the interaction interface and is used for outputting the storage parameters.
The conversion method converts the ambient temperature T, the relative humidity RH and the absolute pressure P to obtain the relative humidity under the standard temperature value, and comprises five steps:
step one, obtaining environmental parameters. Collecting the temperature T of the environment in the packaging box 0 Collecting current relative humidity RH in the packaging box 0 Collecting absolute pressure P in packing box 0 The method comprises the steps of carrying out a first treatment on the surface of the Let the standard temperature be T b Relative humidity at standard temperature of RH b Absolute pressure at standard temperature P b . The nitrogen in the packaging box is relatively stable under the airtight state, the environment of the ideal state of the Ke-La-Bo-Dragon is met, and the nitrogen in the packaging box meets the following conditions:
and step two, establishing an enthalpy and humidity state model. Establishing a state model of the enthalpy and humidity d of nitrogen in the packaging box, and meeting the following equation:
wherein P is S Is the saturated vapor pressure of nitrogen in the tank at the current temperature, M q M is the molar mass of nitrogen in the tank p Is the molar mass of the water vapor.
And thirdly, establishing an enthalpy and humidity constant model. Establishing a constant model of the enthalpy and humidity of the nitrogen state in the packaging box, namely the enthalpy and humidity d of the nitrogen at the current temperature 0 Moisture content d with standard temperature nitrogen enthalpy b Equal. It can be known that:
(273.15+T 0 )·RH b ·P Sb ＝(273.15+T b )·RH 0 ·P S0 wherein P is Sb At a standard temperature T b Saturated water pressure of nitrogen in lower box, P S0 Is T 0 Saturated water pressure of nitrogen in the box at temperature.
And fourthly, fitting a relation equation of temperature and saturated water pressure. Under the standard atmospheric pressure environment, saturated water pressure and temperature at the temperature of minus 10 ℃ to +40 DEG CThe relation of (2) is subjected to data analysis and relation fitting by MATLAB, and the corresponding saturated water pressure P at the temperature T is obtained ST Expressed as a second order equation:
P ST ＝3.3·T 2 +30·T+490
and fifthly, obtaining a relative humidity expression value. Formula integration is carried out, and the airtight packaging box is output at any temperature T 0 Relative humidity RH below 0 Conversion to Standard temperature T b Relative humidity RH below b Can be expressed as:
in the formula, RH 0 、T 0 Collecting the ambient temperature T in the packaging box for the sensor received by the processor 0 And the current relative humidity RH 0 ，T b Is the standard temperature that requires conversion. Substituting the related parameters into the above formula to obtain RH b Is a numerical value of (2).
The display includes: a receiver, a memory and an interactive screen. The output end of the receiver is electrically connected with the interactive screen through the memory, the received data are stored, and meanwhile, user calling information of the interactive screen is received and displayed in the interactive screen.
The device housing includes: structural shell, seal groove, installation screw thread. The seal groove is embedded on the structural shell in a form of a machining groove and is used for assembling the O-shaped seal ring. The mounting screw thread is used for carrying out screw thread machining on the structural shell and is used for being fastened and connected with the nut of the packing box.
The fixed support in the sensor is mechanically connected with the structural shell in the equipment shell in a threaded fastening mode, and the fixed support is fixed inside the structural shell. The interactive screen in the display is mechanically connected with the structural shell in the equipment shell in an embedded mode, and the interactive screen is embedded outside the structural shell. The power pin input end and the communication pin output end of the feed-through filter in the sensor are respectively and electrically connected with the I2C interface input end in the processor, and the temperature, relative humidity and absolute pressure data collected by the sensor are received to supply power to the sensor. The output end of the interaction interface in the processor is electrically connected with the input end of the receiver in the display, and the storage parameters are output to the display.
When the device is used by a user, the O-shaped sealing ring is assembled on the sealing groove of the device shell, and is fixedly connected with the airtight packing box through the mounting threads, so that the structural shell and the airtight packing box are integrated. After the airtight packing box is filled with high-purity nitrogen with certain pressure, the high-purity nitrogen is selected and detected in an interactive screen of a display of the equipment, and each electronic module in the equipment is electrified. And the temperature and humidity sensor and the absolute pressure sensor in the sensor store the acquired parameters in a parameter temporary storage area through an I2C interface of the processor through a feed-through filter. The parameters of the temporary storage area are converted in the model conversion area according to a conversion method: step one, calling environmental parameters; step two, establishing an enthalpy and humidity state model; step three, establishing an enthalpy and humidity constant model; fitting a relation equation of temperature and saturated water pressure; and fifthly, obtaining a relative humidity expression value. The relative humidity expression value is cached in the data storage area and is connected with a receiver of the display through the interactive interface, and finally enters the memory for permanent storage. The user can call in the interactive screen of display according to the demand, sees the change trend of nitrogen gas relative humidity in the packing box after the conversion under standard temperature.
The invention can be used as a method and equipment for detecting the relative humidity of the airtight packing box, and provides enough functional modules and conversion methods, and an operator can modify the detection method and equipment according to the specific application field, and all the modifications or substitutions belong to the protection scope of the appended claims.
Claims (1)
1. The method for detecting the relative humidity of the airtight packing box utilizes airtight packing box relative humidity detection equipment, and the detection equipment comprises a sensor (1), a processor (2), a display (3) and an equipment shell (4), wherein the sensor (1) is connected with the processor (2), the processor (2) is connected with the display (3), and the sensor (1) and the display (3) are connected with the equipment shell (4);
the sensor (1) comprises a temperature and humidity sensor (5), an absolute pressure sensor (6), a feed-through filter (7) and a fixed bracket (8), wherein the feed-through filter (7) further comprises a power supply pin (9) and a communication pin (10); the temperature and humidity sensor (5), the absolute pressure sensor (6) and the feed-through filter (7) are respectively and fixedly connected to the fixed bracket (8); the temperature and humidity sensor (5) and the I2C communication pin of the absolute pressure sensor (6) are electrically connected with the input end of the communication pin (10) of the feed-through filter (7), and the power supply pin of the temperature and humidity sensor (5) and the power supply pin of the absolute pressure sensor (6) are electrically connected with the output end of the power supply pin (9) of the feed-through filter (7); after the power of each sensor is supplied by a power pin (9) of the feed-through filter (7), collected data is output to the processor (2) in an airtight manner by a communication pin (10) of the feed-through filter (7);
the processor (2) comprises an I2C interface (11), a parameter temporary storage area (12), a model conversion area (13), a data storage area (14) and an interaction interface (15), wherein the I2C interface (11), the parameter temporary storage area (12), the model conversion area (13), the data storage area (14) and the interaction interface (15) are electrically connected through electric signals, and the output end of the I2C interface (11) is electrically connected with the input end of the parameter temporary storage area (12) to form temporary storage parameters for ambient temperature, relative humidity and absolute pressure; the output end of the parameter temporary storage area (12) is electrically connected with the input end of the data storage area (14) through the model conversion area (13), the temporary storage parameters are converted to form storage parameters in the data storage area (14), and the output end of the data storage area (14) is electrically connected with the input end of the interaction interface (15); the interactive interface (15) is connected with the display (3);
the display (3) comprises a receiver (17), a memory (18) and an interactive screen (19), wherein the output end of the receiver (17) is electrically connected with the interactive screen (19) through the memory (18), the memory (18) stores received data, and simultaneously receives user calling information of the interactive screen (19) and displays the data in the interactive screen (19);
the equipment shell (4) comprises a structural shell (20), a sealing groove (21) and mounting threads (22); the sealing groove (21) is embedded on the structural shell (20) in a form of a machining groove and is used for assembling an O-shaped sealing ring; the mounting screw thread (22) is used for carrying out screw thread machining on the structural shell (20) and is used for being fastened and connected with a packing box nut;
the fixed support (8) in the sensor (1) is mechanically connected with the structural shell (20) in the equipment shell (4) in a threaded fastening mode, and the fixed support (8) is fixed inside the structural shell (20); the interactive screen (19) in the display (3) is mechanically connected with the structural shell (20) in the equipment shell (4) in an embedded mode, and the interactive screen (19) is embedded outside the structural shell (20); the input end of a power pin (9) and the output end of a communication pin (10) of a feed-through filter (7) in the sensor (1) are respectively and electrically connected with the input end of an I2C interface (11) in the processor (2), and the temperature, relative humidity and absolute pressure data acquired by the sensor (1) are received and simultaneously power is supplied to the sensor (1); the output end of the interaction interface (15) in the processor (2) is electrically connected with the input end of the receiver (17) in the display (3), and the stored parameters are output to the display (3); it is characterized in that the method comprises the steps of,
step one, the airtight packing box relative humidity detection equipment is connected with an airtight packing box interface in an airtight manner through an O-shaped sealing ring and a mounting nut, and the ambient temperature T in the packing box is collected 0 Collecting current relative humidity RH in the packaging box 0 Collecting absolute pressure P in packing box 0 The method comprises the steps of carrying out a first treatment on the surface of the Set at a standard temperature T b The relative humidity is RH b Standard temperature T b Absolute pressure at P b The method comprises the steps of carrying out a first treatment on the surface of the The nitrogen in the packaging box is relatively stable in an airtight state, and the environment of the ideal state of the Ke-La-Bo-Dragon is met, so that the nitrogen in the packaging box meets the following conditions:
step two, establishing an enthalpy and humidity state model, and establishing a state model of the enthalpy and humidity d of nitrogen in the packaging box, wherein the state model meets the equation:
wherein P is S Is the saturated vapor pressure of nitrogen in the tank at the current temperature, M q M is the molar mass of nitrogen in the tank p Is the molar mass of the water vapor;
step three, establishing enthalpyThe constant moisture model is used for establishing a constant moisture model of the enthalpy of the nitrogen state in the packaging box, namely the moisture d of the enthalpy of the nitrogen at the current temperature 0 Moisture content d with standard temperature nitrogen enthalpy b Equal; it can be known that:
(273.15+T 0 )·RH b ·P Sb ＝(273.15+T b )·RH 0 ·P S0
wherein P is Sb At a standard temperature T b Saturated water pressure of nitrogen in lower box, P S0 Is T 0 Saturated water pressure of nitrogen in the box at the temperature;
fitting a relation equation of temperature and saturated water pressure, and under a standard atmospheric pressure environment, carrying out data analysis and relation fitting on the relation of saturated water pressure and temperature at the temperature of-10 ℃ to +40 ℃ by MATLAB to obtain a corresponding saturated water pressure P at the temperature T ST Expressed as a second order equation:
P ST ＝3.3·T 2 +30·T+490
calculating to obtain a relative humidity expression value: formula integration is carried out, and the airtight packaging box is output at any temperature T 0 Relative humidity RH below 0 Conversion to Standard temperature T b Relative humidity RH below b Can be expressed as:
in the formula, RH 0 、T 0 Collecting the ambient temperature T in the packaging box for the sensor received by the processor 0 And the current relative humidity RH 0 ，T b Is the standard temperature required to be converted; substituting the related parameters into the above formula to obtain RH b Is a numerical value of (2).
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