CN113466411A - Relative humidity detection equipment and method for airtight packing box - Google Patents

Relative humidity detection equipment and method for airtight packing box Download PDF

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CN113466411A
CN113466411A CN202110729953.1A CN202110729953A CN113466411A CN 113466411 A CN113466411 A CN 113466411A CN 202110729953 A CN202110729953 A CN 202110729953A CN 113466411 A CN113466411 A CN 113466411A
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relative humidity
packing box
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CN113466411B (en
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张自强
吕秀梅
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Beijing Xinfeng Aerospace Equipment Co Ltd
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Abstract

The invention relates to relative humidity detection equipment and a relative humidity detection method for an airtight packing box, and the relative humidity 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 invention can convert the humidity in the box into a relative humidity expression value corresponding to the standard temperature and permanently store the relative humidity expression value through the structure and sealing matching with the airtight packing box, thereby being convenient for long-period detection of the relative humidity in the packing box.

Description

Relative humidity detection equipment and method for airtight packing box
Technical Field
The invention relates to relative humidity detection equipment and method for an airtight packing box, in particular to relative humidity detection method and equipment for the 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, so as to avoid the exchange with the air outside the packing box. Generally, nitrogen with certain pressure and high concentration is filled in an airtight packing box, so that a reliable environment is provided for storing precious articles such as precision instruments and precious cultural relics, the probability of oxidation and electrochemical corrosion of the articles is reduced, and the stored articles are effectively protected. Generally, humidity indexes in a packaging box are important parameters which are generally concerned, and electronic components in the box are affected with damp due to overhigh humidity, and are easy to generate short circuit, corrosion and the like; the electrostatic adhesion of electronic components can be increased due to too low humidity, and the risk of electric breakdown and memory erasure exists for the integrated circuit. With the development of microelectronic technology, the collection of the humidity of the gas in the packaging box is developed from the reading mode of the traditional color card and a mechanical hygrometer to a multi-parameter, integrated and digital sensor. The chip type sensor can effectively acquire indexes such as temperature, relative humidity, absolute pressure and the like in the current environment in the packing box by integrating devices with different functions. However, the microenvironment in the packaging box is affected by the change of the external environment, for example, the rise of the temperature in the packaging box can be caused by the rise of the environmental temperature, and because a 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 collection of the humidity parameters in the packaging box is in a constantly changing range, which is not beneficial to the long-period detection of the nitrogen humidity and the alarm of the over-threshold value. Therefore, a temperature-humidity-pressure conversion model is embedded in a processor, so that the relative humidity acquired by a sensor is converted into the same temperature value corresponding to the relative humidity, and the same temperature value is displayed and output on equipment, thereby facilitating long-period detection and state control of the relative humidity in the packaging box.
Disclosure of Invention
The invention aims to provide relative humidity detection equipment and method for an airtight packing box, so as to obtain the relative humidity in the airtight packing box.
A relative humidity detection device for an airtight packing box 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,
the sensor 1 comprises a temperature and humidity sensor 5, an absolute pressure sensor 6, a feed-through filter 7 and a fixed support 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 support 8; communication pins I2C of the temperature and humidity sensor 5 and the absolute pressure sensor 6 are electrically connected with the input end of a communication pin 10 of the feed-through filter 7, and power supply pins of the temperature and humidity sensor 5 and the absolute pressure sensor 6 are electrically connected with the output end of a power supply pin 9 of the feed-through filter 7; after each sensor is powered by a power supply pin 9 of the feed-through filter 7, collected data are hermetically output to the processor 2 through 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 of 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 interactive 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, the output end of the receiver 17 is electrically connected with the interactive screen 19 through the memory 18, the memory 18 stores the received data, and meanwhile, the user calling information of the interactive screen 19 is received and the data is displayed in the interactive screen 19;
the equipment housing 4 includes a structural shell 20, a seal groove 21, and mounting threads 22. The sealing groove 21 is embedded in the structural shell 20 in a machining groove mode and is used for assembling an O-shaped sealing ring; mounting threads 22 are threaded on the structural shell 20 for fastening connection with the packing box nut;
the fixed support 8 in the sensor 1 is mechanically connected with a 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 a 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 supply 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 collected by the sensor 1 are received and power is supplied to the sensor 1; the output of the interface 15 in the processor 2 is electrically connected to the input of the receiver 17 in the display 3 for outputting the stored parameters to the display 3.
A method for detecting the relative humidity of an airtight packing box is characterized in that,
step one, the relative humidity detection equipment of the airtight packing box in the claim 1 is connected with the interface of the airtight packing box in an airtight way through an O-shaped sealing ring and a mounting nut, and the environmental temperature T in the packing box is collected0Collecting the current relative humidity RH in the packing box0Collecting absolute pressure P in the packing box0(ii) a Set at a standard temperature of TbRelative humidity of lower is RHbStandard temperature TbAbsolute pressure of Pb(ii) a Nitrogen gas is relatively stable in the packing box under airtight state, satisfies the environment of gram laparo dragon ideal state, consequently, the nitrogen gas state satisfies in the packing box:
Figure BDA0003138948900000041
step two, establishing an enthalpy-moisture content state model, establishing a state model of the enthalpy and moisture content d of the nitrogen in the packaging box, and satisfying the equation:
Figure BDA0003138948900000042
in the formula, PSIs the saturated vapor pressure of nitrogen in the tank at the current temperature, MqIs the molar mass of nitrogen in the tank, MpIs the molar mass of water vapor;
and step three, establishing a constant enthalpy-moisture content model. Establishing a constant enthalpy-moisture content model of the nitrogen in the packaging box, namely the current temperature nitrogen enthalpy-moisture content d0Standard temperature nitrogen enthalpy moisture content dbEqual; it can be known that:
(273.15+T0)·RHb·PSb＝(273.15+Tb)·RH0·PS0in the formula, PSbIs a standard temperature TbSaturated water pressure of nitrogen in the lower tank, PS0Is T0Saturated water pressure of nitrogen in the tank at the temperature;
step four, fitting a relation equation of the temperature and the saturated water pressure, and performing data analysis and relation fitting on the relation between the saturated water pressure and the temperature at the temperature of-10 ℃ to +40 ℃ by using MATLAB under a standard atmospheric pressure environment to obtain the corresponding saturated water pressure P at the temperature TSTExpressed as a second order equation:
PST＝3.3·T2+30·T+490
step five, calculating to obtain a relative humidity expression value: performing formula integration, and outputting the airtight packaging box at any temperature T0Relative humidity RH0Conversion to standard temperature TbRelative humidity RHbCan be expressed as:
Figure BDA0003138948900000051
in the formula, RH0、T0Collecting the ambient temperature T in the packing box for the sensor received by the processor0And the current relative humidity RH0，TbThe standard temperature required to be converted; substituting the related parameters into the above formula to obtain RHbThe numerical value of (c).
The invention has the advantages that: the method and equipment for detecting the relative humidity of the airtight packing box can convert the humidity in the box into a relative humidity expression value corresponding to standard temperature and permanently store the relative humidity expression value through the structure and sealing matching with the airtight packing box, and are convenient for long-period detection of the relative humidity in the packing box.
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FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic view showing the connection state of the present invention with an airtight packing case;
FIG. 3 is a schematic view of a connection between the casing and the airtight packing box of the present invention;
FIG. 4 is an electrical schematic block diagram of the present invention;
FIG. 5 is a flow chart of the method of the present invention.
The device comprises a sensor 1, a sensor 2, a processor 3, a display 4, a device shell 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 memory 19, an interaction screen 20, a structure shell 21, a sealing groove 22, mounting threads 23, an outer wall of an airtight packing box and an inner wall of the airtight packing box 24.
Detailed Description
The relative humidity detecting method and equipment for airtight packing box includes sensor 1, processor 2, display 3 and casing 4.
The sensor includes: 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, the feed-through filter 7 and the fixing support 8 are mechanically connected in a threaded fastening mode. Communication pins I2C 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 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 each sensor is powered by a power supply pin 9 of the feed-through filter 7, collected data are hermetically output through a communication pin 10 of the feed-through filter 7.
The processor 2 includes: I2C interface 11, parameter temporary storage area 12, model conversion area 13, data storage area 14, interactive interface 15, model conversion area 13 also includes 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 the temporary storage parameters of the environmental temperature, the relative humidity and the absolute pressure are formed. 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 a 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 interactive interface 15 and is used for storing the output of the 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 one, S101, obtaining environmental parameters. Collecting the ambient temperature T in the packing box0Collecting the current relative humidity RH in the packing box0Collecting absolute pressure P in the packing box0(ii) a Setting the standard temperature as TbRelative humidity at standard temperature is RHbAbsolute pressure at standard temperature of Pb. Nitrogen gas is relatively stable in the packing box under airtight state, satisfies the environment of gram Boilon ideal state, and nitrogen gas state satisfies in the packing box:
Figure BDA0003138948900000071
step two S102, an enthalpy and moisture content state model is established. Establishing a state model of the enthalpy and the moisture content d of the nitrogen in the packaging box, and satisfying the equation:
Figure BDA0003138948900000072
in the formula, PSIs the saturated vapor pressure of nitrogen in the tank at the current temperature, MqIs the molar mass of nitrogen in the tank, MpIs the molar mass of water vapor.
Step three S103, establishing an enthalpy-moisture constant model. Establishing a constant enthalpy-moisture content model of the nitrogen in the packaging box, namely the current temperature nitrogen enthalpy-moisture content d0Standard temperature nitrogen enthalpy moisture content dbAre equal. It can be known that:
(273.15+T0)·RHb·PSb＝(273.15+Tb)·RH0·PS0in the formula, PSbIs a standard temperature TbSaturated water pressure of nitrogen in the lower tank, PS0Is T0Saturated water pressure of nitrogen in the tank at temperature.
Step four S104, fitting a relation equation of the temperature and the saturated water pressure. Under the environment of standard atmospheric pressure, the relation between the saturated water pressure and the temperature under the temperature of minus 10 ℃ to plus 40 ℃ is subjected to data analysis and relation fitting by using MATLAB to obtain the corresponding saturated water pressure P under the temperature TSTExpressed as a second order equation:
PST＝3.3·T2+30·T+490
and step five S105, obtaining a relative humidity expression value. Performing formula integration, and outputting the airtight packaging box at any temperature T0Relative humidity RH0Conversion to standard temperature TbRelative humidity RHbCan be expressed as:
Figure BDA0003138948900000081
in the formula, RH0、T0Collecting the ambient temperature T in the packing box for the sensor received by the processor0And the current relative humidity RH0，TbIs the standard temperature that needs to be switched. Substituting the related parameters into the above formula to obtain RHbThe numerical value of (c).
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, and the received data is stored, and meanwhile, the user calling information of the interactive screen 19 is received and the data is displayed in the interactive screen 19.
The apparatus casing 4 includes: structural shell 20, seal groove 21, mounting threads 22. A sealing groove 21 is embedded in the structural shell 20 in the form of a machined groove for fitting an O-ring seal. Mounting threads 22 are threadedly machined on the structural shell 20 for secure attachment to the packing nut.
The fixed support 8 in the sensor 1 is mechanically connected with a structural shell 20 in the equipment shell 4 through 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 by means of an embedding with a structural housing 20 in the device housing 4, the interactive screen 19 being embedded outside the structural housing 20. The input end of a power supply pin 9 and the output end of a communication pin 10 of the 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 collected by the sensor 1 are received and power is supplied to the sensor 1. The output of the interface 15 in the processor 2 is electrically connected to the input of the receiver 17 in the display 3 for outputting the stored parameters to the display 3.
When the user uses the apparatus, first, the O-ring is fitted into the sealing groove 21 of the apparatus case 4, and the sealing groove is tightly connected to the airtight packing box by the mounting thread 22, so that the structural casing 20 and the airtight packing box are integrated. After the airtight packing box is filled with high-purity nitrogen with certain pressure, the detection is selected in the interactive screen 19 of the display 3 of the equipment, and all electronic modules in the equipment are 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 an I2C interface 11 of the processor 2 through a feed-through filter 7. The buffer parameters are converted in the model conversion area 13 according to a conversion method 16: step one, S101, environmental parameters are called; step two S102, establishing an enthalpy-moisture state model; step three, S103, establishing an enthalpy-moisture constant model; step four S104, fitting a relation equation of the temperature and the 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, connected with the receiver 17 of the display 3 through the interactive interface 15, and finally enter the memory 18 for permanent storage. The user can call up in the interactive screen 19 of the display 3 according to the requirement, and see the change trend of the relative humidity of the nitrogen in the packing box after conversion at the standard temperature.
The specific design scheme is as follows:
the O-shaped sealing ring is hermetically connected with the packaging box, the sensor collects parameters of temperature, relative humidity and absolute pressure in the packaging box in real time and outputs the data through the feed-through filter in an airtight mode, the data are converted in the processor combination according to a preset model, and the data are input to the display for human-computer interaction according to the relative humidity value at the standard temperature. The equipment 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 relative humidity detection method and equipment for an airtight packing box comprise a sensor, a processor, a display and an equipment shell.
The sensor includes: 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, the feed-through filter and the fixed support are mechanically connected in a threaded fastening mode. I2C communication pins of the temperature and humidity sensor and the absolute pressure sensor are electrically connected with the input end of the communication pin of the feed-through filter, and power supply pins of the temperature and humidity sensor and the absolute pressure sensor are electrically connected with the output end of the power supply pin of the feed-through filter. And after each sensor is powered by a power supply pin of the feed-through filter, the acquired data is hermetically output through a communication pin of the feed-through filter.
The processor includes: the system comprises an I2C interface, a parameter temporary storage area, a model conversion area, a data storage area and an interactive interface, wherein the model conversion area further comprises a conversion method. The parts are electrically connected by electrical signals. The output end of the I2C interface is electrically connected with the input end of the parameter temporary storage area, and the temporary storage parameters of the environmental temperature, the relative humidity and the absolute pressure are formed. 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 a 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 interactive interface and 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 a standard temperature value, and comprises the following five steps:
step one, obtaining environmental parameters. Collecting the ambient temperature T in the packing box0Collecting the current relative humidity RH in the packing box0Collecting absolute pressure P in the packing box0(ii) a Setting the standard temperature as TbRelative humidity at standard temperature is RHbAbsolute pressure at standard temperature of Pb. Nitrogen gas is relatively stable in the packing box under airtight state, satisfies the environment of gram Boilon ideal state, and nitrogen gas state satisfies in the packing box:
Figure BDA0003138948900000111
and step two, establishing an enthalpy-moisture state model. Establishing a state model of the enthalpy and the moisture content d of the nitrogen in the packaging box, and satisfying the equation:
Figure BDA0003138948900000112
in the formula, PSIs the saturated vapor pressure of nitrogen in the tank at the current temperature, MqIs the molar mass of nitrogen in the tank, MpIs the molar mass of water vapor.
And step three, establishing a constant enthalpy-moisture content model. Establishing a constant enthalpy-moisture content model of the nitrogen in the packaging box, namely the current temperature nitrogen enthalpy-moisture content d0Standard temperature nitrogen enthalpy moisture content dbAre equal. It can be known that:
(273.15+T0)·RHb·PSb＝(273.15+Tb)·RH0·PS0in the formula, PSbIs a standard temperature TbSaturated water pressure of nitrogen in the lower tank, PS0Is T0Saturated water pressure of nitrogen in the tank at temperature.
And step four, fitting a relation equation of the temperature and the saturated water pressure. Under the environment of standard atmospheric pressure, the relation between the saturated water pressure and the temperature under the temperature of minus 10 ℃ to plus 40 ℃ is subjected to data analysis and relation fitting by using MATLAB to obtain the corresponding saturated water pressure P under the temperature TSTExpressed as a second order equation:
PST＝3.3·T2+30·T+490
and step five, obtaining a relative humidity expression value. Performing formula integration, and outputting the airtight packaging box at any temperature T0Relative humidity RH0Conversion to standard temperature TbRelative humidity RHbCan be expressed as:
Figure BDA0003138948900000121
in the formula, RH0、T0Collecting the ambient temperature T in the packing box for the sensor received by the processor0And the current relative humidity RH0，TbIs the standard temperature that needs to be switched. Substituting the related parameters into the above formula to obtain RHbThe numerical value of (c).
The display includes: receiver, memory and interactive screen. The output end of the receiver is electrically connected with the interactive screen through the memory, the received data is stored, and meanwhile, the user calling information of the interactive screen is received and the data is displayed in the interactive screen.
The device housing includes: structure shell, seal groove, installation screw thread. The seal groove is embedded in the structural shell in a machining groove mode and used for assembling the O-shaped seal ring. The mounting thread is machined on the structural shell in a thread machining mode and is used for being fastened and connected with the nut of the packing box.
A fixing support in the sensor is mechanically connected with a structure shell in the equipment shell in a threaded fastening mode, and the fixing support is fixed inside the structure shell. The interactive screen in the display is mechanically connected with a structural shell in the equipment shell in an embedding mode, and the interactive screen is embedded outside the structural shell. The feed-through filter power pin input end and the communication pin output end 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 and simultaneously power is supplied to the sensor. The output end of the interactive interface in the processor is electrically connected with the input end of the receiver in the display, and the stored parameters are output to the display.
When a user uses the equipment, the O-shaped sealing ring is assembled on the sealing groove of the equipment shell, and is fixedly connected with the airtight packing box through the mounting thread, so that the structural shell and the airtight packing box are integrated. After the airtight packing box is filled with high-purity nitrogen gas with certain pressure, the detection is selected in an interactive screen of a display of the equipment, and all electronic modules in the equipment are powered on. The temperature and humidity sensor and the absolute pressure sensor in the sensor store the collected parameters in the parameter temporary storage area through an I2C interface of the processor by 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, environmental parameters are called; step two, establishing an enthalpy-moisture state model; step three, establishing an enthalpy-moisture content constant model; step four, fitting a relation equation of the temperature and the saturated water pressure; and step five, obtaining a relative humidity expression value. The relative humidity expression value is cached in the data storage area, is connected with a receiver of the display through the interactive interface and finally enters the memory for permanent storage. The user can transfer in the interactive screen of display according to the demand, sees the trend of change after nitrogen gas relative humidity changes under standard temperature in the packing box.
The present invention can be used as a method and a device for detecting the relative humidity of an airtight packing box, and provides enough functional modules and a conversion method, so that an user can modify the detection method and the detection device according to the specific application field, and all the modifications or the substitutions are within the protection scope of the appended claims.

Claims (2)

1. A relative humidity detection device for an airtight packing box 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),
the sensor (1) comprises a temperature and humidity sensor (5), an absolute pressure sensor (6), a feed-through filter (7) and a fixed support (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 support (8); I2C communication pins of the temperature and humidity sensor (5) and the absolute pressure sensor (6) are electrically connected with the input end of a communication pin (10) of the feed-through filter (7), and power supply pins of the temperature and humidity sensor (5) and the absolute pressure sensor (6) are electrically connected with the output end of a power supply pin (9) of the feed-through filter (7); after each sensor is powered by a power supply pin (9) of the feed-through filter (7), hermetically outputting the acquired data to a processor (2) through a communication pin (10) of a 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 of 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 interactive 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), 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 meanwhile, the user calling information of the interactive screen (19) is received and the data is displayed 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 in the structural shell (20) in a machining groove mode and is used for assembling an O-shaped sealing ring; the mounting thread (22) is used for carrying out thread machining on the structural shell (20) and is used for fastening and connecting with the nut of the packing box;
a fixed support (8) in the sensor (1) is mechanically connected with a structural shell (20) in the equipment shell (4) in a threaded fastening mode, and the fixed support (8) is fixed in the structural shell (20); the interactive screen (19) in the display (3) is mechanically connected with a structural shell (20) in the equipment shell (4) in an embedding mode, and the interactive screen (19) is embedded outside the structural shell (20); the input end of a power supply 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 collected by the sensor (1) are received and simultaneously power is supplied to the sensor (1); the output end of the interactive interface (15) in the processor (2) is electrically connected with the input end of the receiver (17) in the display (3) and outputs the stored parameters to the display (3).
2. A method for detecting the relative humidity of an airtight packing box is characterized in that,
step one, the relative humidity detection equipment of the airtight packing box in the claim 1 is connected with the interface of the airtight packing box in an airtight way through an O-shaped sealing ring and a mounting nut, and the environmental temperature T in the packing box is collected0Collecting the mixtureCurrent relative humidity RH in the package0Collecting absolute pressure P in the packing box0(ii) a Set at a standard temperature of TbRelative humidity of lower is RHbStandard temperature TbAbsolute pressure of Pb(ii) a Nitrogen gas is relatively stable in the packing box under airtight state, satisfies the environment of gram laparo dragon ideal state, consequently, the nitrogen gas state satisfies in the packing box:
Figure FDA0003138948890000031
step two, establishing an enthalpy-moisture content state model, establishing a state model of the enthalpy and moisture content d of the nitrogen in the packaging box, and satisfying the equation:
Figure FDA0003138948890000032
in the formula, PSIs the saturated vapor pressure of nitrogen in the tank at the current temperature, MqIs the molar mass of nitrogen in the tank, MpIs the molar mass of water vapor;
and step three, establishing a constant enthalpy-moisture content model. Establishing a constant enthalpy-moisture content model of the nitrogen in the packaging box, namely the current temperature nitrogen enthalpy-moisture content d0Standard temperature nitrogen enthalpy moisture content dbEqual; it can be known that:
(273.15+T0)·RHb·PSb＝(273.15+Tb)·RH0·PS0
in the formula, PSbIs a standard temperature TbSaturated water pressure of nitrogen in the lower tank, PS0Is T0Saturated water pressure of nitrogen in the tank at the temperature;
step four, fitting a relation equation of the temperature and the saturated water pressure, and performing data analysis and relation fitting on the relation between the saturated water pressure and the temperature at the temperature of-10 ℃ to +40 ℃ by using MATLAB under a standard atmospheric pressure environment to obtain the corresponding saturated water pressure P at the temperature TSTExpressed as a second order equation:
PST＝3.3·T2+30·T+490
step five, calculating to obtain a relative humidity expression value: performing formula integration, and outputting the airtight packaging box at any temperature T0Relative humidity RH0Conversion to standard temperature TbRelative humidity RHbCan be expressed as:
Figure FDA0003138948890000041
in the formula, RH0、T0Collecting the ambient temperature T in the packing box for the sensor received by the processor0And the current relative humidity RH0，TbThe standard temperature required to be converted; substituting the related parameters into the above formula to obtain RHbThe numerical value of (c).
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JP2016017889A (en) * 2014-07-09 2016-02-01 株式会社デンソー Humidity sensor and humidity sensor calibration system
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