CN112158472A - Method for improving precision of constant temperature box - Google Patents
Method for improving precision of constant temperature box Download PDFInfo
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- CN112158472A CN112158472A CN202011036674.9A CN202011036674A CN112158472A CN 112158472 A CN112158472 A CN 112158472A CN 202011036674 A CN202011036674 A CN 202011036674A CN 112158472 A CN112158472 A CN 112158472A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/38—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation
- B65D81/3813—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation rigid container being in the form of a box, tray or like container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/38—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation
- B65D81/3813—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation rigid container being in the form of a box, tray or like container
- B65D81/3816—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation rigid container being in the form of a box, tray or like container formed of foam material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/38—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation
- B65D81/3813—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation rigid container being in the form of a box, tray or like container
- B65D81/3823—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation rigid container being in the form of a box, tray or like container formed of different materials, e.g. laminated or foam filling between walls
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Abstract
The invention discloses a method for improving precision of an incubator, which comprises the following steps: preparing a constant temperature box; the size and the material of the constant temperature box are adjusted to obtain a relational expression of the absolute value of the difference between the ambient temperature and the target temperature to the heat preservation target temperature of the constant temperature box, and according to the relational expression, a standard bid winning method is provided to reduce the temperature fluctuation of a heat preservation box body in the constant temperature box so as to improve the precision of the constant temperature box. Under the given target temperature and the given environment temperature, the invention can greatly reduce the temperature fluctuation of the constant temperature box so as to greatly improve the precision of the constant temperature box.
Description
Technical Field
The invention belongs to the technical field of instruments and equipment, and particularly relates to a method for improving precision of a thermostat.
Background
Along with the development of science and technology, the precision requirement of instruments is higher and higher, so the requirement on the environment temperature is higher and higher, and the heat preservation precision analysis and precision improvement research on the heat preservation box structure are less at present. The molecular measuring machine developed by the national NIST adopts a multilayer closed structure to ensure the constant temperature of the central working chamber, and the highest heat-preservation precision is +/-0.005 ℃ at a target temperature of 20 ℃ and an ambient temperature of 17 ℃. The heat insulation layer, the sound insulation layer, the vacuum layer and the test layer are of 4-layer structure, and the highest precision of the heat insulation structure can reach +/-0.001 ℃ at the target temperature of 20 ℃. The heat-insulating material is applied to the environment temperature of infrared heat pair radiation blackbodies, high-precision instruments, nanotechnology and the like, and the higher the heat-insulating precision is, the more precise the heat-insulating precision is.
Disclosure of Invention
In view of the above, the present invention provides a method for improving the precision of an oven, comprising the following steps:
c=0.0004|a| (1)
c=0.00055|a| (2);
step 4, changing the peripheral material of the incubator with the size of 300mm multiplied by 300mm inside the incubator body, and keeping other structures unchanged; setting the environmental temperature of the incubator to 5 ℃, 10 ℃, 15 ℃, 20 ℃, 30 ℃, 35 ℃, 40 ℃ and 45 ℃ respectively, and setting the target temperature to 25 ℃, and then performing simulation by adopting ANSYS to obtain the relation between the difference a between the environmental temperature and the target temperature and the difference c between the highest temperature and the lowest temperature on the incubator body:
c=0.0051|a| (3);
step 6, uniformly expressing the approximate relational expressions (1) to (3) as C ═ C | a |, and showing that C changes when the volume of the box body changes or the material of the box body changes; when the box body is the same, the relation coefficient C is unchanged, and the temperature fluctuation of the box body is the same as long as the absolute value of the difference between the ambient temperature and the target temperature is the same; as the absolute value of the difference between the ambient temperature and the target temperature becomes smaller, the temperature fluctuation of the box body becomes smaller; when the difference between the ambient temperature and the target temperature is 0, the temperature fluctuation of the case is 0.
Optionally, the size of the inner dimension of the oven in step 1 is 200mm × 200mm × 200mm, and the material of the oven body is aluminum alloy 6061.
Optionally, the inner size of the oven in step 3 is changed to 300mm × 300mm × 300 mm.
Optionally, the material of the periphery of the incubator in the step 4 is changed into a vacuum insulation board and is changed into polyurethane foam.
Compared with the prior art, the invention can obtain the following technical effects:
the invention provides a method for improving the precision of an incubator, which can ensure that the temperature fluctuation of the incubator is greatly reduced under the given target temperature and the given environmental temperature, thereby greatly improving the precision of the incubator. The constant temperature box is used for placing instruments, equipment and the like to be insulated, a correspondingly large space is designed for the instruments, the materials, the equipment and the like to be insulated, the constant temperature box is not a large constant temperature room, people do not need to stay inside, the influence on the insulation precision and the waste of the space are reduced, and meanwhile, energy can be saved.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a temperature fluctuation diagram of an incubator of the present invention having dimensions of 200mm × 200mm × 200mm and a case made of an aluminum alloy 6061; wherein (1) represents the relation curve of a and c, and the environmental temperature of the incubator is lower than 25 ℃; (2) the curve representing the relation between a and c is higher than 25 ℃ at the ambient temperature of the constant temperature box; a represents the difference between the ambient temperature and the target temperature, and the unit is C represents the difference between the highest temperature and the lowest temperature on the heat preservation box body, namely the temperature fluctuation on the heat preservation box body, and the unit is C; "O" is a point of obtaining a corresponding temperature fluctuation value of the heat preservation box body according to the difference between the environmental temperature and the target temperature through ANSYS simulation; "it means the point where the c value at the corresponding a on the straight line is obtained by fitting the simulated data points, the same as below;
FIG. 2 is a temperature fluctuation diagram of the incubator of the present invention, in which the size of the incubator is 300mm × 300mm × 300mm and the material of the body of the incubator is aluminum alloy 6061; wherein (1) represents the relation curve of a and c, and the environmental temperature of the incubator is lower than 25 ℃; (2) the curve representing the relation between a and c is higher than 25 ℃ at the ambient temperature of the constant temperature box; a represents the difference between the ambient temperature and the target temperature, and the unit is C represents the difference between the highest temperature and the lowest temperature on the heat preservation box body, namely the temperature fluctuation on the heat preservation box body, and the unit is C;
FIG. 3 is a temperature fluctuation diagram of the incubator of the present invention, in which the size of the incubator is 300mm × 300mm × 300mm, and the material of the body of the incubator is a vacuum insulation panel and is changed to polyurethane foam; wherein (1) represents the relation curve of a and c, and the environmental temperature of the incubator is lower than 25 ℃; (2) the curve representing the relation between a and c is higher than 25 ℃ at the ambient temperature of the constant temperature box; a represents the difference between the ambient temperature and the target temperature, and the unit is C represents the difference between the highest temperature and the lowest temperature on the heat preservation box body, namely the temperature fluctuation on the heat preservation box body, and the unit is C;
FIG. 4 is a temperature fluctuation diagram of the incubator of the present invention, in which the size of the incubator is 300mm × 300mm × 300mm, and the material of the body of the incubator is a vacuum insulation panel and is changed to polyurethane foam; wherein (1) the relation curve of a and c is lower than 10 ℃ in the environment temperature of the constant temperature box; (2) the curve representing the relation between a and c is higher than 10 ℃ at the ambient temperature of the constant temperature box; a represents the difference between the ambient temperature and the target temperature, and the unit is C represents the difference between the highest temperature and the lowest temperature on the heat preservation box body, namely the temperature fluctuation on the heat preservation box body, and the unit is C;
FIG. 5 is a graph showing the temperature distribution of the incubator of the present invention at an ambient temperature of 0 ℃;
FIG. 6 is a temperature profile of the spherical shell tank of the present invention;
FIG. 7 is a schematic representation of the optimized spherulite shell case temperature profile of the present invention;
FIG. 8 is the optimized large spherical shell tank temperature distribution of the present invention;
FIG. 9 is the temperature profile of the large heating spherical shell tank of the present invention;
FIG. 10 is a temperature profile of a micro-heated large spherical shell tank of the present invention;
FIG. 11 is a temperature profile of a micro-heated capsule housing of the present invention.
Detailed Description
The following embodiments are described in detail with reference to the accompanying drawings, so that how to implement the technical features of the present invention to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Example 1
A method of improving the accuracy of an incubator comprising the steps of:
c=0.0004|a| (1)
c=0.00055|a| (2);
step 4, changing the vacuum insulation plate of the material at the periphery of the incubator with the size of the incubator body of 300mm multiplied by 300mm into polyurethane foam, and keeping other structures unchanged; the environmental temperatures of the thermostats were set to 5 ℃, 10 ℃, 15 ℃, 20 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃ and the target temperature was set to 25 ℃, respectively, and then simulation was performed using ANSYS to obtain the temperature fluctuations of the incubator at different environmental temperatures as shown in fig. 3 below. From fig. 3, it can be seen that the relationship between a and c presents a good straight line, and the relationship can be obtained as follows:
c=0.0051|a| (3);
when the target temperature is set to 10 ℃, the environmental temperatures of the constant temperature box are respectively set to-10 ℃, 5 ℃, 0 ℃, 5 ℃, 15 ℃, 20 ℃, 25 ℃ and 30 ℃, and then simulation is carried out by adopting ANSYS, so that the temperature fluctuation of the incubator body under different environmental temperatures is obtained as shown in the following figure 4; the temperature distribution of the heat preservation box body under the environment temperature of 0 ℃ is 10.008-9.9573 ℃, the temperature fluctuation of the heat preservation box body is 0.0507 ℃, as shown in figure 5, the temperature distribution layout of different heat preservation box bodies under other environments is similar to that of figure 5, the temperature distribution of a circular area in the center of each surface of the heat preservation box body is uniform, and each corner of the box body generates a large temperature difference with the center of each surface.
the environmental temperature of the spherical incubator is set to be 0 ℃, the target temperature of the spherical shell box body is set to be 10 ℃, the heat-insulating layer is made of polyurethane foam, the temperature distribution of the spherical shell box body is 10.02-10.019 ℃ and the temperature fluctuation is 0.001 ℃ through simulation, as shown in figure 6, the temperature fluctuation is smaller than that of figure 5, and the heat-insulating precision of the spherical shell box body structure is improved.
Step 6, the above approximate relational expressions (1) to (3) are collectively expressed as C ═ C | a |, and it can be seen that C changes when the volume of the case changes or the material of the case changes. In the case of the same tank, the coefficient of the relational expression C is not changed, and the temperature fluctuation of the tank is the same as long as the absolute value of the difference between the ambient temperature and the target temperature is the same. As the absolute value of the difference between the ambient temperature and the target temperature becomes smaller, the temperature fluctuation of the case becomes smaller. When the difference between the ambient temperature and the target temperature is 0, the temperature fluctuation of the case is 0.
Example 2
The method for improving the precision of the incubator is a standard method for improving the precision of the incubator, and the temperature fluctuation of the incubator body becomes smaller as the absolute value of the difference between the ambient temperature and the target temperature becomes smaller. A layer of heat insulation material is wrapped outside a small spherical shell box body (or in other shapes), the thickness of the heat insulation layer is set as a variable value at a specific environment temperature and a target temperature, the absolute value of the difference between the highest temperature and the lowest temperature on the spherical shell box body (or in other shapes), namely the minimum temperature fluctuation, is set as a target, and the ANSYS is adopted for genetic algorithm optimization. The volume of the small spherical (or other shape) incubator is enlarged to obtain a large spherical (or other shape) incubator, and the inner diameter (or inner dimension) of the spherical shell (or other shape) casing is the outer diameter (or outer dimension) of the whole small incubator optimized in the previous. The environmental temperature and the target temperature of the large constant temperature box and the small constant temperature box are the same, the large constant temperature box is optimized, and the optimization method is the same as that of the small constant temperature box. And finally, placing the small constant temperature box into a large constant temperature, wherein the outside of the large constant temperature box is the ambient temperature, heating or cooling the large constant temperature box to obtain a target temperature value of the large constant temperature box which is as close to the target temperature in the small constant temperature box as possible, and then slightly heating or cooling the small constant temperature box to obtain the final target temperature.
The 300mm diameter spherical shell box body shown in fig. 7 is made of aluminum alloy 6061, is wrapped with vacuum heat insulation material, is used as a small initial incubator, the environment temperature is set to be-10 ℃, the target temperature is set to be 22 ℃, and is optimized by ANSYS, the thickness of the obtained heat insulation layer is 45mm, and the temperature distribution of the spherical shell box body is shown in fig. 7. The temperature distribution of the spherical shell box body is 22.0862-22.858 ℃, and the temperature fluctuation is 0.0004. Then, the large incubator is optimized, the spherical shell box body is made of aluminum alloy 6061, a vacuum heat-insulating material is wrapped outside the spherical shell box body, the environment temperature is set to be-10 ℃, the target temperature is set to be 22 ℃ and is the same as that of the small incubator in the figure 7, the difference is that the inner diameter of the spherical shell box body of the large incubator is 394mm of the outermost diameter of the optimized small incubator, ANSYS is adopted for optimization, the thickness of the obtained heat-insulating layer is 45mm, the outer diameter of the spherical shell of the large incubator is 484mm, and the temperature distribution of the spherical shell box body is shown in the following figure. The temperature distribution of the spherical shell box body is 22.077-22.076 ℃, and the temperature fluctuation is 0.001 ℃. Then, the optimized small thermostat is placed into the optimized large thermostat, the environment temperature outside the large thermostat is minus 10 ℃, the target temperature of the small thermostat in the whole thermostat is 22 ℃, the large thermostat is heated greatly to obtain the temperature distribution of the large spherical shell box, and the value of the temperature distribution is as close as possible to the target temperature value of the spherical shell box of the small thermostat as shown in fig. 9. On the basis, the temperature distribution of the large spherical shell case obtained by micro-heating the small spherical shell case is shown in fig. 10. As shown in FIG. 11, the temperature distribution of the small spherical shell box body is 22.015705-22.015703 ℃, and the temperature fluctuation is 2x10-6The temperature fluctuation is greatly reduced, and the temperature fluctuation is two decimal orders of magnitude smaller than that of a small thermostat optimized independently, so that the corresponding temperature precision is greatly improved. According to the relationship and analysis of the fifth step, the temperature fluctuations of the small incubator body inside the incubator are even smaller if the external ambient temperature of the incubator is particularly close to the target temperature.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method of improving the accuracy of an incubator, comprising the steps of:
step 1, preparing a thermostat, wherein a vacuum heat insulation plate heat insulation layer is wrapped on the periphery of a heat insulation box body;
step 2, setting the environmental temperature of the incubator to 5 ℃, 10 ℃, 15 ℃, 20 ℃, 30 ℃, 35 ℃, 40 ℃ and 45 ℃ respectively, and setting the target temperature to 25 ℃, and then performing simulation by adopting ANSYS to obtain the relationship between the difference a between the environmental temperature and the target temperature and the difference c between the highest temperature and the lowest temperature on the incubator body:
c=0.0004|a| (1)
step 3, changing the internal size of the constant temperature box, and keeping other structures unchanged; setting the environmental temperature of the incubator to 5 ℃, 10 ℃, 15 ℃, 20 ℃, 30 ℃, 35 ℃, 40 ℃ and 45 ℃ respectively, and setting the target temperature to 25 ℃, and then performing simulation by adopting ANSYS to obtain the relation between the difference a between the environmental temperature and the target temperature and the difference c between the highest temperature and the lowest temperature on the incubator body:
c=0.00055|a| (2);
step 4, changing the peripheral material of the incubator with the size of 300mm multiplied by 300mm inside the incubator body, and keeping other structures unchanged; setting the environmental temperature of the incubator to 5 ℃, 10 ℃, 15 ℃, 20 ℃, 30 ℃, 35 ℃, 40 ℃ and 45 ℃ respectively, and setting the target temperature to 25 ℃, and then performing simulation by adopting ANSYS to obtain the relation between the difference a between the environmental temperature and the target temperature and the difference c between the highest temperature and the lowest temperature on the incubator body:
c=0.0051|a| (3);
step 5, the place with large temperature difference of the cube heat preservation box is a corner, the corner is removed, the cube heat preservation box is designed into a spherical shell structure, and the cube heat preservation box body with the inner size of 300mm multiplied by 300mm is changed into a spherical shell box body with the inner diameter of 300 mm;
step 6, uniformly expressing the approximate relational expressions (1) to (3) as C ═ C | a |, and showing that C changes when the volume of the box body changes or the material of the box body changes; when the box body is the same, the relation coefficient C is unchanged, and the temperature fluctuation of the box body is the same as long as the absolute value of the difference between the ambient temperature and the target temperature is the same; as the absolute value of the difference between the ambient temperature and the target temperature becomes smaller, the temperature fluctuation of the box body becomes smaller; when the difference between the ambient temperature and the target temperature is 0, the temperature fluctuation of the case is 0.
2. The method according to claim 1, wherein the inside dimension of the oven in step 1 is 200mm x 200mm, and the material of the oven case is aluminum alloy 6061.
3. The method as claimed in claim 1, wherein the inside size of the oven in step 3 is changed to 300mm x 300 mm.
4. The method as claimed in claim 1, wherein the step 4 is that the oven periphery material is changed into vacuum insulation board and polyurethane foam.
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CN1829993A (en) * | 2003-07-24 | 2006-09-06 | 旭化成生活制品株式会社 | Optimum shape designing method and designing system |
US8539408B1 (en) * | 2008-07-29 | 2013-09-17 | Clarkson University | Method for thermal simulation |
CN104238592A (en) * | 2014-09-15 | 2014-12-24 | 北京东方计量测试研究所 | Rapid thermostat self-adaption control method and system |
US20200218318A1 (en) * | 2019-01-04 | 2020-07-09 | Hitachi High-Technologies Corporation | Temperature control apparatus, temperature control method, non-transitory computer readable medium and temperature control system |
CN111539147A (en) * | 2020-04-28 | 2020-08-14 | 西南石油大学 | Seabed umbilical cable temperature field analysis based on finite element simulation |
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Patent Citations (6)
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CN1829993A (en) * | 2003-07-24 | 2006-09-06 | 旭化成生活制品株式会社 | Optimum shape designing method and designing system |
CN1483643A (en) * | 2003-08-15 | 2004-03-24 | 清华大学 | Temp management method for cold-keeping transportation |
US8539408B1 (en) * | 2008-07-29 | 2013-09-17 | Clarkson University | Method for thermal simulation |
CN104238592A (en) * | 2014-09-15 | 2014-12-24 | 北京东方计量测试研究所 | Rapid thermostat self-adaption control method and system |
US20200218318A1 (en) * | 2019-01-04 | 2020-07-09 | Hitachi High-Technologies Corporation | Temperature control apparatus, temperature control method, non-transitory computer readable medium and temperature control system |
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