CN206930308U - A kind of cold chain is popped one's head in wireless humiture - Google Patents
A kind of cold chain is popped one's head in wireless humiture Download PDFInfo
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- CN206930308U CN206930308U CN201720286581.9U CN201720286581U CN206930308U CN 206930308 U CN206930308 U CN 206930308U CN 201720286581 U CN201720286581 U CN 201720286581U CN 206930308 U CN206930308 U CN 206930308U
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Abstract
A kind of cold chain is popped one's head in wireless humiture, master control borad including housing and in housing and the power supply to master control borad power supply, the master control borad is provided with temperature and humidity measurement circuit, processing unit and wireless transport module, the processing unit will be transmitted after the data processing of temperature and humidity measurement circuit by wireless transport module, the temperature and humidity measurement circuit includes temperature and humidity measurement element, the temperature and humidity measurement element includes thermistor and divider resistance, the divider resistance resistance is R, resistance is Rw, R >=10Rw under thermistor normal temperature state.Due to thermistor as temperature reduces gradually increase, therefore the divider resistance that corresponding thermistor is larger under normal temperature is set, in measurement range, during close to the upper limit, divider resistance can share larger voltage, as temperature gradually reduces, divider resistance shares less voltage, because scope range of the fluctuation of voltage is wider, therefore measurement is more accurate, works as R>10Rw, the non-linear measurement error brought of thermistor can be controlled in 0.1 DEG C.
Description
Technical field
Thermometry field is the utility model is related to, especially a kind of cold chain is popped one's head in wireless humiture.
Background technology
Cold chain refers to that some raw-food materials, the food by processing or semi-finished product, special biological products and medicine are passing through
After crossing purchase, processing, sterilizing, inactivation, during Product processing, storage, transport, distribution and retail, use, its links
All the time it is under specific low temperature environment necessary to product, reduces loss, prevent from polluting and go bad, ensures that product food is pacified
Entirely, bio-safety, the special supply chain system of drug safety.
In order to ensure the temperature of cold chain, monitoring device generally is set in the equipment of cold chain, for monitoring the temperature of cold chain.
Common detector unit, due to being nonlinear, therefore, the temperature measurement accuracy in low-temperature space and high-temperature region is low, the temperature difference compared with
Greatly, for the very sensitive biological products of temperature, it is very high to temperature requirement, and its activity drop may be caused if error is larger
It is low, so as to cause safety problem.How to improve temperature detection longitude turn into cold chain wireless humiture probe subject matter it
One.
Utility model content
In order to solve the above-mentioned technical problem, the utility model provides a kind of cold chain and popped one's head in wireless humiture, its thermometric
Accurately, product safety problem caused by temperature detection inaccuracy can effectively be prevented.
A kind of cold chain is popped one's head in wireless humiture, including housing and master control borad in housing and is supplied to the master control borad
The power supply of electricity, the master control borad are provided with temperature and humidity measurement circuit, processing unit and wireless transport module, and the processing unit is by temperature
Transmitted after the data processing of humidity measuring circuit by wireless transport module, the temperature and humidity measurement circuit includes temperature and humidity measurement
Element, the temperature and humidity measurement element include thermistor and divider resistance, and the divider resistance resistance is R, and thermistor is normal
Resistance is Rw, R >=10Rw under temperature state.
Further, the temperature upper limit after the processing unit processes is less than 20 DEG C.
Further, the temperature range after the processing unit processes is -40 DEG C~10 DEG C.
Further, the temperature and humidity measurement element is arranged on the opposite face of processing unit.
Further, the housing includes upper shell and lower house, and the upper shell or lower house are provided with groove, the electricity
Source is button cell, and the button cell is arranged in the groove.
Further, metal clips, one end and the master control plate weld of the metal clips, the gold are provided with the housing
Category shell fragment is provided with depressed part, and the depressed part electrically connects with button cell.
Further, the housing includes upper shell and lower house, and the upper shell is provided with through hole, temperature and humidity measurement element
The corresponding through hole is set.
Further, the housing includes upper shell and lower house, and the upper shell inner surface is provided with locating dowel, the master
Control plate is provided with through hole, and the locating dowel passes through the through hole, and the lower house inner surface is provided with positioning hole, and the locating dowel is set
In positioning hole.
Further, the housing includes upper shell and lower house, and the upper shell is provided with transparent window, the master control borad
Switch and indicator lamp are provided with, the indicator lamp corresponds to the transparent window and set.
Using the above method, the utility model has following technique effect：
1. temperature measuring circuit includes thermistor and divider resistance, the divider resistance resistance is R, and thermistor is normal
Resistance is Rw, R under temperature state>10Rw.Due to thermistor as temperature reduces gradually increase, therefore set corresponding under normal temperature
The larger divider resistance of thermistor, in measurement range, close to the upper limit when, divider resistance can share larger voltage, with temperature
Degree gradually reduces, and divider resistance shares less voltage, and because scope range of the fluctuation of voltage is wider, therefore measurement is more accurate, works as R
>10Rw, the non-linear measurement error brought of thermistor can be controlled in 0.1 DEG C.
2. because the temperature upper limit shown after processing is less than 20 DEG C, with reference to the demand of cold chain thermometric, temperature-measuring range is concentrated
At relatively low section, measurement accuracy is higher, suitable for the occasion high to temperature requirement.
3. temperature-measuring range is arranged on into -40 DEG C~10 DEG C, it can meet conventional cold chain requirement, due to temperature-measuring range compared with
It is small, therefore thermometric is more accurate.
4. temperature and humidity measurement element is arranged on the opposite face of processing unit, therefore, effectively prevent from sending out when processing unit from working
Thermally-induced thermometric is inaccurate.
5. upper shell inner surface is provided with locating dowel, the master control borad is provided with through hole, and the locating dowel passes through the through hole,
The lower house inner surface is provided with positioning hole, and the locating dowel is arranged in positioning hole.By the positioning of positioning hole and locating dowel,
So that master control borad is securely fixed in housing, prevent temperature and humidity measurement element from rocking caused measurement error, while prevent temperature
Moisture measurement component wear.
Brief description of the drawings
Fig. 1 is the temperature curve of thermistor.
Fig. 2 is structural representation of the present utility model.
Fig. 3 is the structure schematic diagram of master control borad.
Fig. 4 is upper shell structural representation.
Fig. 5 is lower house structural representation.
Fig. 6 is the circuit diagram of temperature detection.
Housing 1, upper shell 2,21, push-button recess 22 of releasing the button, through hole 23, locating dowel 24, lower house 3, positioning hole 31,
It is button cell 4, groove 41, master control borad 5, single-chip microcomputer 51, time block 52, memory module 53, through hole 55, metal clips 6, warm and humid
Spend measuring cell 7.
Embodiment
The technical scheme of the utility model embodiment is explained with reference to the accompanying drawing of the utility model embodiment and
Illustrate, but following embodiments are only preferred embodiment of the present utility model, and it is not all.Based on the embodiment in embodiment,
Those skilled in the art obtain other embodiment on the premise of creative work is not made, and belong to of the present utility model
Protection domain.
Embodiment one：
As shown in figure 1, it is nonlinear that the resistance of thermistor, which varies with temperature, it is gradual with the rising resistance of temperature
Reduce, gradually increase with the decline resistance of temperature.Conventional test model is generally linear, as shown in the L1 in figure, its
It is larger in high temperature section and low temperature and actual temperature error.
Wireless humiture probe of the present utility model as shown in Figure 2-5, present embodiments provides a kind of cold chain with wireless temperature
Moisture probe, it includes housing 1, and housing 1 is made up of upper shell 2 and lower house 3, passes through screw between upper shell 2 and lower house 3
Nut is fixedly mounted, and the outer surface of upper shell 2, which is installed with, releases the button 21, and releasing the button 21 is embedded in push-button recess 22,
Push-button recess 22 is cylinder, and one end of cylinder is run through the inwall of upper shell 2 and is fixedly mounted on inwall, in housing 1
The power supply powered provided with master control borad 5 and to master control borad 5, power supply is button cell 4 in the present embodiment, the master control borad 5
Provided with temperature measuring circuit, processing unit and wireless transport module, the processing unit includes single-chip microcomputer 51, in the present embodiment
In, the processing unit will be transmitted after the data processing of temperature measuring circuit by wireless transport module, at the processing unit
The temperature upper limit shown after reason is less than 20 DEG C.
The inner surface of upper shell 2 is provided with groove 41, and button cell 4 is arranged in the groove 41.Button cell 4 and master control
Metal clips 6 is provided between plate 5, one end and the master control plate weld of metal clips, the metal clips is provided with depressed part, described recessed
The portion of falling into is against button cell, so that button cell electricity is powered by metal clips to master control borad 5.Master control borad 5 is using two-sided
Printing, single-chip microcomputer 51, time block 52 and memory module 53 are arranged on the front of master control borad, and temperature and humidity measurement circuit includes warm and humid
Measuring cell 7 is spent, temperature and humidity measurement element 7 is arranged on the opposite face at the back side of master control borad, i.e. single-chip microcomputer 51, so as to effectively prevent
Thermometric is inaccurate caused by heating when processing unit works.The inner surface of upper shell 2 is provided with locating dowel 24, and the master control borad is set
There is through hole 55, the locating dowel 24 passes through the through hole 55, and the lower house inner surface is provided with positioning hole 31, the locating dowel 24
It is arranged in positioning hole 31.So as to which the temperature of master control borad 5 is fixed in housing, prevent temperature and humidity measurement element from rocking caused survey
Error is measured, while prevents temperature and humidity measurement component wear.
The upper shell 2 is provided with through hole 23, and the temperature and humidity measurement element corresponds to the through hole and set, so that extraneous
Air permeable through hole directly contacted with temperature and humidity measurement element, therefore measure humiture it is more accurate.
Further, the upper shell 2 is additionally provided with transparent window, and the master control borad is provided with switch and indicator lamp, described
Indicator lamp corresponds to the transparent window and set.So that the light of indicator lamp can be spread out of from transparent window, user is reminded.
The schematic diagram of temperature measuring circuit is as shown in fig. 6, temperature and humidity measurement element 7 includes thermistor R and divider resistance
Rw, one end of thermistor are connected with power supply 5V, and the other end is connected with thermistor R, the other end ground connection of thermistor, normal temperature
R=11*Rw under state, because the accurate thermometric upper limit of the present embodiment is 20 DEG C, therefore, during close to the thermometric upper limit, its resistance approaches
R=11*Rw, the temperature signal T now detected is about 5V*11/12=0.42V.As temperature gradually reduces, Rw resistance is gradual
Increase, when temperature drops to -30 DEG C by 20 DEG C, resistance has increased about 10 times, and now temperature signal T is about 2.5V, with
Temperature reduces again, and its temperature signal T gradually rises, and when temperature drops to -80 DEG C, its temperature signal T is about 4.5V.Temperature
Signal T is transmitted to single-chip microcomputer 51 by signal wire, and analog quantity is converted into digital quantity by single-chip microcomputer 51, and data are shown and led to
Cross wireless transport module transmission.Because -80 DEG C~temperature signal voltage corresponding to 20 DEG C of the scheme of the present embodiment one is 0.42V
~4.5V, it is incorporated in the low temperature environment in cold chain, takes full advantage of thermistor larger characteristic of resistance under low-temperature condition,
Larger divider resistance is set, realizes the accurate thermometric in cold chain environment.
It is appreciated that divider resistance R of the present utility model is not limited to 11Rw, those skilled in the art are according to being actually needed
Can suitably it adjust, the Rw of such as R=10Rw, R=12.
It is appreciated that those skilled in the art can also pop one's head according to the wireless humiture that specific environment in cold chain uses,
Set the lower temperature measurement upper limit, it is generally the case that the scope of accurate measurement temperature is -40 DEG C~10 DEG C.
As described above, preferred embodiment only of the present utility model, is not used for limiting reality of the present utility model
Scope is applied, i.e., all equivalent changes and modifications made according to the utility model, is all that the utility model claims scope is covered,
Here no longer illustrate one by one.
Claims (9)
1. a kind of cold chain is popped one's head in wireless humiture, including housing and master control borad in housing and powered to the master control borad
Power supply, the master control borad is provided with temperature and humidity measurement circuit, processing unit and wireless transport module, it is characterised in that:The place
Reason unit will be transmitted after the data processing of temperature and humidity measurement circuit by wireless transport module, and the temperature and humidity measurement circuit includes
Temperature and humidity measurement element, the temperature and humidity measurement element include thermistor and divider resistance, and the divider resistance resistance is R,
Resistance is Rw, R >=10Rw under thermistor normal temperature state.
2. cold chain according to claim 1 is popped one's head in wireless humiture, it is characterised in that：After the processing unit processes
Temperature upper limit is less than 20 DEG C.
3. cold chain according to claim 2 is popped one's head in wireless humiture, it is characterised in that：After the processing unit processes
Temperature range is -40 DEG C~10 DEG C.
4. the cold chain according to one of claim 1-3 is popped one's head in wireless humiture, it is characterised in that：The temperature and humidity measurement
Element is arranged on the opposite face of processing unit.
5. cold chain according to claim 1 is popped one's head in wireless humiture, it is characterised in that：The housing include upper shell and
Lower house, the upper shell or lower house are provided with groove, and the power supply is button cell, and the button cell is arranged on described recessed
In groove.
6. cold chain according to claim 4 is popped one's head in wireless humiture, it is characterised in that：Metal elastic is provided with the housing
Piece, one end and the master control plate weld of the metal clips, the metal clips are provided with depressed part, the depressed part and button cell
Electrical connection.
7. cold chain according to claim 1 is popped one's head in wireless humiture, it is characterised in that：The housing include upper shell and
Lower house, the upper shell are provided with through hole, and temperature and humidity measurement element corresponds to the through hole and set.
8. cold chain according to claim 1 is popped one's head in wireless humiture, it is characterised in that：The housing include upper shell and
Lower house, the upper shell inner surface are provided with locating dowel, and the master control borad is provided with through hole, and the locating dowel passes through the through hole,
The lower house inner surface is provided with positioning hole, and the locating dowel is arranged in positioning hole.
9. cold chain according to claim 1 is popped one's head in wireless humiture, it is characterised in that：The housing include upper shell and
Lower house, the upper shell are provided with transparent window, and the master control borad is provided with switch and indicator lamp, described in the indicator lamp is corresponding
Transparent window is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720286581.9U CN206930308U (en) | 2017-03-23 | 2017-03-23 | A kind of cold chain is popped one's head in wireless humiture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720286581.9U CN206930308U (en) | 2017-03-23 | 2017-03-23 | A kind of cold chain is popped one's head in wireless humiture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206930308U true CN206930308U (en) | 2018-01-26 |
Family
ID=61349692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720286581.9U Active CN206930308U (en) | 2017-03-23 | 2017-03-23 | A kind of cold chain is popped one's head in wireless humiture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206930308U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111351584A (en) * | 2020-05-08 | 2020-06-30 | 厦门竣怡健康电子科技有限公司 | Infrared temperature measurement card |
-
2017
- 2017-03-23 CN CN201720286581.9U patent/CN206930308U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111351584A (en) * | 2020-05-08 | 2020-06-30 | 厦门竣怡健康电子科技有限公司 | Infrared temperature measurement card |
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