CN108181958A - A kind of constant temperature and moisture test device and method suitable for tobacco thermophysical property measurement - Google Patents
A kind of constant temperature and moisture test device and method suitable for tobacco thermophysical property measurement Download PDFInfo
- Publication number
- CN108181958A CN108181958A CN201810023550.3A CN201810023550A CN108181958A CN 108181958 A CN108181958 A CN 108181958A CN 201810023550 A CN201810023550 A CN 201810023550A CN 108181958 A CN108181958 A CN 108181958A
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- temperature
- constant temperature
- tobacco
- constant
- humidity
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- 241000208125 Nicotiana Species 0.000 title claims abstract description 47
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 47
- 238000005259 measurement Methods 0.000 title claims abstract description 35
- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 102
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000008676 import Effects 0.000 claims description 7
- 239000011810 insulating material Substances 0.000 claims description 2
- 239000000523 sample Substances 0.000 abstract 5
- 239000013068 control sample Substances 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000012620 biological material Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000008542 thermal sensitivity Effects 0.000 description 1
- 230000005945 translocation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
Abstract
A kind of constant temperature and moisture test device and method suitable for tobacco thermophysical property measurement, it is characterised in that：Including sample bin, be the constant temperature water bath system that constant temperature is provided outside sample bin, be gas circuit constant temperature and humidity system and data collecting system, control system and computer that constant temperature and humidity gas is provided in sample bin；0 100 DEG C of circulator bath, the compressed air of arbitrary proportion mixing and the mixed gas of saturated steam can be selected in the present invention, to ensure that the tobacco sample in sample bin has uniform temperature and humidity.And recirculated water and the parameters such as mixed gas temperature and flow can be adjusted respectively, the temperature of effective control loop water and the humiture of mixed gas, adjustable range is broad, has many advantages, such as that temperature and humidity control is accurate reliable, easy to operate.The device adapts to a variety of test parameters, provides reliable and stable experiment porch for less than 100 DEG C tobacco thermophysical property measurements, achievees the purpose that effectively to control sample humiture, improve the accuracy and reliability of thermophysical property measurement.
Description
Technical field
The present invention relates to tobacco thermophysical property measurement fields, and in particular to a kind of constant temperature for being adapted to tobacco thermophysical property measurement is permanent
Wet test device and method.
Background technology
Tobacco is a kind of thermal sensitivity biological material, and under temperature match curing conditions, tobacco heat physical state easily changes, and
Tobacco thermophysical property measurement requirement test sample is in stable condition.Thermophysical property measurement temperature and humidity control device phase under previous tobacco temperature match curing conditions
To simple, temperature and humidity control is inaccurate, and therefore, a set of effective constant temperature and humidity device of research and design has tobacco thermophysical property measurement
Important meaning.
Temperature and humidity is two important parameters during tobacco thermophysical property measurement, and whether Temperature and Humidity Control is accurate directly
Influence the validity and reliability of tobacco thermophysical property measurement result.During the temperature of tobacco system tends to be uniform, moisture
It can migrate, tobacco moisture can be caused to be unevenly distributed in this way, it is unreliable so as to cause tobacco thermophysical property measurement result.
The thermal physical property parameter of tobacco designs and develops smoke machine equipment and hot-working process control parameter has the function of directiveness,
And temperature and humidity is two important parameters during tobacco thermophysical property measurement, so, humiture is accurately controlled to tobacco heat
Physical measurement is most important.But previous tobacco thermophysical property measurement temperature and humidity control device is relatively easy, it is difficult to avoid temperature not
, the problems such as water translocation, accurately and reliably thermal physical property parameter is hardly resulted under temperature match curing conditions.
Invention content
For tobacco thermophysical property measurement present situation and the above-mentioned deficiency of the prior art, the object of the present invention is to provide one kind to be applicable in
In the constant temperature and moisture test device of tobacco thermophysical property measurement, which is adapted to different ermal physics states, can be tobacco alternating temperature
Under the conditions of thermophysical property measurement test platform is provided so that temperature and humidity is uniform in test sample, improve tobacco thermophysical property measurement
Accuracy and reliability.
The purpose of the present invention is achieved through the following technical solutions：
A kind of constant temperature and moisture test device suitable for tobacco thermophysical property measurement, including sample bin, to provide perseverance outside sample bin
The constant temperature water bath system of temperature, the gas circuit constant temperature and humidity system to provide constant temperature and humidity gas in sample bin and data acquisition system
System, control system and computer；The constant temperature water bath system includes constant temperature circulating water pump, constant water bath box and respective cycle pipe
Road, sample bin are arranged in constant water bath box；The gas circuit constant temperature and humidity system includes constant temperature water tank, is arranged in constant temperature water tank
Heating rod, bubble dish, gas mixing chamber and saturated vapor chamber, be respectively equipped on gas mixing chamber and connected with saturated vapor chamber
Saturated vapor entrance and the dry air entrance that is connected with over dry air air source, the gas outlet of gas mixing chamber passes through pipeline
It is connected with sample bin, heat exchanger is equipped on the dry air air inlet pipeline of gas mixing chamber；The data collecting system includes setting
The import and export air-flow Temperature Humidity Sensor on sample bin is put, is accordingly arranged on constant temperature water bath system, gas circuit constant temperature and humidity system
In temperature sensor and data collecting card form；The control system includes the dry air being located on dry air air inlet pipeline
Flow controller, the saturated vapor flow controller being located on bubble dish air inlet pipeline, for controlling the PID of constant temperature water tank water temperature
Temperature controller and relay；The data collecting system and control system are connected with computer.
In the present invention, the quantity of sample bin is two, is arranged in constant water bath box, permanent with gas circuit in sample bin
Constant temperature and humidity system connectivity is both provided with import and export air-flow Temperature Humidity Sensor on two sample bins.
The temperature sensing being arranged in constant temperature water bath system, gas circuit constant temperature and humidity system include be located on sample bin into,
Exit flow Temperature Humidity Sensor, the temperature sensor being located on constant water bath box, the water tank temperature being located on constant temperature water tank pass
Sensor and saturated vapor sensor and gas mixing chamber temperature sensor.
In the present invention, the control mode of control system is controlled using closed loop, i.e., constant temperature water tank uses PID Self-tuning Systems
Constant-temperature control method, by the temperature value that feeds back constant temperature water tank temperature sensor measurement compared with setting value, control relay
Whether the break-make and then control heating rod of device work.
Heat preserving and insulating material is coated on each pipeline of the experimental rig.
Using above-mentioned experimental rig carry out sample constant temperature and moisture test method, be by respectively to constant temperature water tank water temperature,
Gas flow temperature, humidity and flow parameter in water bath water temperature, mixing chamber control effectively so that water bath water temperature and into
The mixed airflow humiture for entering sample bin keeps constant value, so as to ensure the tobacco sample in sample bin itself moisture content and temperature
It keeps constant, improves the accuracy of tobacco thermophysical property measurement.
Tobacco thermophysical property measurement constant temperature and moisture test device using the above structure, feature are：
1) constant temperature circulating water pump has heating and temperature controlling function, and the pipeline being connect with water bath is cladded with thermal insulation material, a constant temperature
The water of degree establishes closed circulation by constant temperature circulating water pump, ensures that sample bin surrounding maintains the temperature of setting, temperature adjusts model
It is 0~100 DEG C to enclose, temperature temperature-controlled precision ± 0.2 DEG C.
2) bubble dish generates bubble and reaches constant temperature water tank top into saturated vapor, and saturated vapor is pressed with heated dry air
Setting ratio is sufficiently mixed, and mixed proportion is in the range of 0~100%, humid control precision ± 0.5%.
3) mixed gas of certain humiture is constantly passed through in sample bin, after a certain period of time, tobacco sample in sample bin
Dynamic equilibrium is desorbed in water adsorption, at this point, tobacco sample has uniform temperature and humidity, reaches tobacco thermophysical property measurement
Condition.
Advantages of the present invention is as follows：In temperature control aspect, heating water bath is carried out to sample bin using constant temperature circulating water pump,
And be aided with and carry out heated at constant temperature to being passed through sample bin mixed gas, accurate temperature controlling, temperature control range 0~100 can be carried out to sample bin
DEG C, temperature-controlled precision ± 0.2 DEG C；In terms of humid control, tobacco sample is passed through using saturated vapor and the mixing of dry air arbitrary proportion,
The mode that tobacco sample is in adsorption/desorption dynamic equilibrium is made to keep constant sample moisture content, avoids moisture during alternating temperature
The influence to tobacco thermophysical property measurement is migrated, controls wet range 0~100%, adjustable range is wide, controls wet precision ± 0.5%.
Description of the drawings
Fig. 1 is the constant temperature and moisture test apparatus structure schematic diagram for tobacco thermophysical property measurement of the present invention.
In Fig. 1：1- constant temperature water tanks, 1.1- constant temperature water tank temperature sensors；1.2- mixing chamber temperature sensors, 1.3- saturations
Steam temperature sensor；2- water baths, 2.1- water bath temperature sensors；3- sample bins；3.1- sample bin inlet air flows are warm and humid
Spend sensor；3.2- sample bin exit flow Temperature Humidity Sensors；4- saturated vapor chambers, 5- mixing chambers；6- heat exchangers；It is 7.1- full
With steam flow controller；7.2- dry air flow controllers；8- heating rods；9- bubble dishes；10-PID temperature controllers；11- relays
Device；12- data collecting cards；13- constant temperature circulating water pumps；14- serial servers；15- computers.
In Fig. 1：1.1- constant temperature water tank；1.2- water bath；2- sample bins；2.1- sample bin inlet air flow temperature and humidity sensings
Device；2.2- sample bin exit flow Temperature Humidity Sensors；3- bath temperature sensors；4.1- water tank temperature sensors；It is 4.2- mixed
Close chamber temperature sensor, 4.3- saturated-steam temperature sensors；5- mixing chambers；6- heat exchangers；7.1- saturated vapors flow controls
Device；7.2- dry air flow controllers；8- heating rods；9- bubble dishes；10-PID temperature controllers；11- relays；12- data acquire
Card；13- constant temperature circulating water pumps；14- serial servers；15- computers.
Specific embodiment
The present invention is described further below in conjunction with attached drawing：
As shown in Figure 1：A kind of constant temperature and moisture test device for tobacco thermophysical property measurement, including sample bin 3, for outside sample bin
Portion provides the constant temperature water bath system of constant temperature, the gas circuit constant temperature and humidity system to provide constant temperature and humidity gas in sample bin and number
According to acquisition system, control system and computer；The constant temperature water bath system include constant temperature circulating water pump 12, constant water bath box 2 and
Respective cycle pipeline, sample bin 3 are arranged in constant water bath box 2；The gas circuit constant temperature and humidity system includes constant temperature water tank 1, if
Heating rod 7, bubble dish 8, gas mixing chamber 5 and saturated vapor chamber 4 in constant temperature water tank are put, is distinguished on gas mixing chamber 5
It is mixed equipped with the saturated vapor entrance connected with saturated vapor chamber 4 and the dry air entrance connected with over dry air air source, gas
The gas outlet for closing chamber 4 is connected by pipeline with sample bin 3, and heat exchanger is equipped on the dry air air inlet pipeline of gas mixing chamber 4
6；The data collecting system includes the import and export air-flow Temperature Humidity Sensor 3.1,3.2 being arranged on sample bin 3, accordingly sets
The temperature sensor and data collecting card 12 put in constant temperature water bath system, gas circuit constant temperature and humidity system are formed；The control
System includes the dry air flow controller 7.2 being located on dry air air inlet pipeline, the saturation being located on bubble dish air inlet pipeline
Steam flow controller 7.1, for controlling the PID temperature controllers 10 of 1 water temperature of constant temperature water tank and relay 11；The data acquisition system
System and control system are connected with computer 15.
In the present invention, the quantity of sample bin 3 is two, is arranged in constant water bath box 2, in sample bin and gas circuit
Constant temperature and humidity system connects, and import and export air-flow Temperature Humidity Sensor 3.1,3.2 is both provided on two sample bins.
The temperature sensing being arranged in constant temperature water bath system, gas circuit constant temperature and humidity system include be located on sample bin into,
Exit flow Temperature Humidity Sensor 3.1,3.2, the temperature sensor 2.1 being located on constant water bath box, is located on constant temperature water tank
Water tank temperature sensor 1.1 and saturated-steam temperature sensor 1.3 and gas mixing chamber temperature sensor 1.2.
Specific works step and control process are as follows：
As shown in Figure 1, the constant water to set temperature is sent into water bath 2 by constant temperature circulating water pump 13, to keep sample bin 3 four
Zhou Hengwen, while detect whether water temperature in water bath 2 reaches setting value by bath temperature sensor 2.1；Added by heating rod 8
Water in hot constant temperature water tank 1, while wherein water temperature is measured, and temperature data is sent into PID temperature controls by water tank temperature sensor 1.1
Instrument 10 is compared with setting value, is controlled whether heating rod 8 heats by relay 11 according to comparing result, is made constant temperature water tank 1
Middle water temperature is kept constant；Compressed air require is controlled by saturated vapor flow controller 7.1 all the way, is led to through respective line
Enter bubble dish 9 and generate micro-bubble in water, so as to generate the saturated vapor under the water temperature condition, saturated-steam temperature is by saturation
Steam temperature sensor 4.3 is detected, and saturated vapor is subsequently entered in mixing chamber 5；Dry air flow is by dry air flow control
Device 7.2 processed controls, and dry air enters heat exchanger 6 through respective line and carries out heat exchange with water in constant temperature water tank 1.1, makes its temperature
It is heated to identical with water temperature, subsequently enters the wet sky for being mixed into certain humiture in mixing chamber 5 by setting ratio with saturated vapor
Gas, humid air temperature is detected by mixing chamber temperature sensor 1.2 in mixing chamber；Saturated vapor and compressed air are after mixing
The gaseous mixture of formation enters through respective line in sample bin 3, and 3 inlet air flow temperature of sample bin is by sample bin inlet air flow humiture
Sensor 3.1 is detected, and 3 exit flow temperature of sample bin is measured by sample bin exit flow Temperature Humidity Sensor 3.2.
By being carried out respectively to parameters such as constant temperature water tank water temperature, water bath water temperature, mixed airflow temperature, humidity and flows
Effectively control so that water bath water temperature and the mixed airflow humiture into sample keep constant value, so as to ensure tobacco sample
Itself moisture content is kept constant with temperature, improves the accuracy of tobacco thermophysical property measurement.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (6)
1. a kind of constant temperature and moisture test device suitable for tobacco thermophysical property measurement, it is characterised in that：Including sample bin, be sample
There is provided outside storehouse the constant temperature water bath system of constant temperature, the gas circuit constant temperature and humidity system to provide constant temperature and humidity gas in sample bin, with
And data collecting system, control system and computer；The constant temperature water bath system include constant temperature circulating water pump, constant water bath box and
Respective cycle pipeline, sample bin are arranged in constant water bath box；The gas circuit constant temperature and humidity system includes constant temperature water tank, is arranged on
Heating rod, bubble dish, gas mixing chamber and saturated vapor chamber in constant temperature water tank, are respectively equipped on gas mixing chamber and saturation
The saturated vapor entrance of vapor chamber connection and the dry air entrance connected with over dry air air source, the outlet of gas mixing chamber
Mouth is connected by pipeline with sample bin, and heat exchanger is equipped on the dry air air inlet pipeline of gas mixing chamber；The data acquisition
System includes the import and export air-flow Temperature Humidity Sensor being arranged on sample bin, and it is permanent to be accordingly arranged on constant temperature water bath system, gas circuit
Temperature sensor and data collecting card in constant temperature and humidity system are formed；The control system includes being located at dry air air inlet pipeline
On dry air flow controller, the saturated vapor flow controller being located on bubble dish air inlet pipeline, for controlling thermostatted water
The PID temperature controllers and relay of case water temperature；The data collecting system and control system are connected with computer.
2. the constant temperature and moisture test device according to claim 1 suitable for tobacco thermophysical property measurement, it is characterised in that：Sample
The quantity in product storehouse is two, is arranged in constant water bath box, is connected in sample bin with gas circuit constant temperature and humidity system, in difference
Import and export air-flow Temperature Humidity Sensor is both provided on product storehouse.
3. the constant temperature and moisture test device according to claim 1 suitable for tobacco thermophysical property measurement, it is characterised in that：If
It puts the temperature sensing in constant temperature water bath system, gas circuit constant temperature and humidity system and includes the import and export air-flow temperature being located on sample bin
Humidity sensor, the temperature sensor being located on constant water bath box, the water tank temperature sensor being located on constant temperature water tank and full
With vapor sensor and gas mixing chamber temperature sensor.
4. the constant temperature and moisture test device according to claim 1 suitable for tobacco thermophysical property measurement, it is characterised in that：It should
Heat preserving and insulating material is coated on each pipeline of experimental rig.
5. the constant temperature and moisture test device according to claim 1 suitable for tobacco thermophysical property measurement, it is characterised in that：Institute
State temperature control ranging from 0-100 DEG C of the constant water bath box to sample bin.
6. a kind of method for the constant temperature and moisture test that tobacco thermophysical property measurement is carried out using claim 1 described device, feature
It is：By respectively to gas flow temperature, humidity and the flow parameter in constant temperature water tank water temperature, water bath water temperature, mixing chamber into
Row effectively control so that water bath water temperature and the mixed airflow humiture into sample bin keep constant value, so as to ensure sample
Tobacco sample itself moisture content in storehouse is kept constant with temperature, improves the accuracy of tobacco thermophysical property measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810023550.3A CN108181958A (en) | 2018-01-10 | 2018-01-10 | A kind of constant temperature and moisture test device and method suitable for tobacco thermophysical property measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810023550.3A CN108181958A (en) | 2018-01-10 | 2018-01-10 | A kind of constant temperature and moisture test device and method suitable for tobacco thermophysical property measurement |
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| Publication Number | Publication Date |
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| CN108181958A true CN108181958A (en) | 2018-06-19 |
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| CN201810023550.3A Pending CN108181958A (en) | 2018-01-10 | 2018-01-10 | A kind of constant temperature and moisture test device and method suitable for tobacco thermophysical property measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111399568A (en) * | 2020-02-29 | 2020-07-10 | 天津大学 | Multi-closed-loop temperature and humidity control system for mechanical testing of micro-cavity environment |
| CN113966855A (en) * | 2021-11-24 | 2022-01-25 | 河南中烟工业有限责任公司 | Co-heating type tobacco sample preparation device with fixed moisture content and preparation method |
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|---|---|---|---|---|
| GB1324584A (en) * | 1972-03-06 | 1973-07-25 | Reynolds Leasing Corp | Tobacco treatment process |
| CN101491368A (en) * | 2009-03-12 | 2009-07-29 | 中国烟草总公司郑州烟草研究院 | Combined thermal transmission type micro roller drying device of tobacco |
| CN201624133U (en) * | 2009-12-11 | 2010-11-10 | 吉林省烟草公司白城市公司 | Central heating tobacco baking system using heat transfer oil as heat carrier |
| WO2015043332A1 (en) * | 2013-09-25 | 2015-04-02 | 上海烟草集团有限责任公司 | Full-automatic dynamic tobacco moisture analysis climate box |
| CN106801974A (en) * | 2016-12-30 | 2017-06-06 | 山东中烟工业有限责任公司 | One grow tobacco balance between thermostatic constant wet control system and its method |
| CN207924549U (en) * | 2018-01-10 | 2018-09-28 | 中国烟草总公司郑州烟草研究院 | A kind of constant temperature and moisture test device suitable for tobacco thermophysical property measurement |
-
2018
- 2018-01-10 CN CN201810023550.3A patent/CN108181958A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1324584A (en) * | 1972-03-06 | 1973-07-25 | Reynolds Leasing Corp | Tobacco treatment process |
| CN101491368A (en) * | 2009-03-12 | 2009-07-29 | 中国烟草总公司郑州烟草研究院 | Combined thermal transmission type micro roller drying device of tobacco |
| CN201624133U (en) * | 2009-12-11 | 2010-11-10 | 吉林省烟草公司白城市公司 | Central heating tobacco baking system using heat transfer oil as heat carrier |
| WO2015043332A1 (en) * | 2013-09-25 | 2015-04-02 | 上海烟草集团有限责任公司 | Full-automatic dynamic tobacco moisture analysis climate box |
| CN106801974A (en) * | 2016-12-30 | 2017-06-06 | 山东中烟工业有限责任公司 | One grow tobacco balance between thermostatic constant wet control system and its method |
| CN207924549U (en) * | 2018-01-10 | 2018-09-28 | 中国烟草总公司郑州烟草研究院 | A kind of constant temperature and moisture test device suitable for tobacco thermophysical property measurement |
Non-Patent Citations (1)
| Title |
|---|
| 马亚萍等: "不同温度条件下烟丝―发烟剂体系热物性研究", 《食品与机械》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111399568A (en) * | 2020-02-29 | 2020-07-10 | 天津大学 | Multi-closed-loop temperature and humidity control system for mechanical testing of micro-cavity environment |
| CN111399568B (en) * | 2020-02-29 | 2024-03-29 | 天津大学 | Multi-closed-loop temperature and humidity control system for mechanical testing of micro-cavity environment |
| CN113966855A (en) * | 2021-11-24 | 2022-01-25 | 河南中烟工业有限责任公司 | Co-heating type tobacco sample preparation device with fixed moisture content and preparation method |
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Application publication date: 20180619 |