CN109967152B - Fixed point device based on accuse temperature high accuracy salt bath constant temperature groove - Google Patents
Fixed point device based on accuse temperature high accuracy salt bath constant temperature groove Download PDFInfo
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- CN109967152B CN109967152B CN201910355057.6A CN201910355057A CN109967152B CN 109967152 B CN109967152 B CN 109967152B CN 201910355057 A CN201910355057 A CN 201910355057A CN 109967152 B CN109967152 B CN 109967152B
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- fixed point
- salt bath
- constant temperature
- bath constant
- fixing device
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- 150000003839 salts Chemical class 0.000 title claims abstract description 45
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 239000012774 insulation material Substances 0.000 claims abstract description 4
- 238000005192 partition Methods 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 230000008014 freezing Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
Landscapes
- Health & Medical Sciences (AREA)
- Clinical Laboratory Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Control Of Temperature (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses a fixed point device based on a temperature control high-precision salt bath constant temperature tank, which comprises a salt bath constant temperature tank, wherein the salt bath constant temperature tank is longitudinally divided into two communicated cavities by a partition plate, one of the cavities is a stirring cavity, the other cavity is a working cavity, a stirring device is arranged in the stirring cavity, a fixed point fixing device is arranged in the working cavity, the upper end of the fixed point fixing device is isolated from the inner wall of the upper end of the working cavity through a heat insulation material, the edge of the upper end of the fixed point fixing device is in sealing connection with the inner wall of the upper end of the working cavity, the lower end of the fixed point fixing device is arranged on the inner wall of the lower end of the working cavity through a supporting rod, and a fixed point container fixing device is arranged in the fixed point fixing device so as to ensure that the fixed point container device cannot be damaged due to vibration. The invention combines the fixed point with the salt bath constant temperature tank, provides a better temperature field environment for the reproduction of the fixed point, and achieves the high-level reproduction of the fixed point.
Description
Technical Field
The invention relates to metering calibration equipment, in particular to a fixed point device based on a temperature-control high-precision salt bath constant temperature tank.
Background
The development of a fixed point as one of the three elements of the temperature scale definition extends through the entire development history of the temperature scale, and a series of fixed points including an indium freezing point, a tin freezing point, a zinc freezing point, an aluminum freezing point and the like have been formed in the upper-zero temperature region so far. The fixed point furnace is used for heating the fixed point container, and provides a good temperature field for the reproduction process of the fixed points, so that the quality of the fixed point furnace temperature field directly influences the reproduction level of the fixed points.
The three-section fixed point temperature control furnace adopted by the most widely used fixed point furnace device internationally at present has the temperature control precision of 0.1 ℃ and the temperature field uniformity of 0.1-0.2 ℃. A good temperature field environment cannot be provided for reproduction of the fixed point, and high-level reproduction of the fixed point cannot be realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a fixed point device based on a temperature control high-precision salt bath constant temperature tank, which improves and optimizes the existing device to ensure that the device meets the application of a fixed point, and the device has the advantages of simple operation, convenient disassembly and high safety and can be conveniently applied by a user.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The utility model provides a fixed point device based on accuse temperature high accuracy salt bath constant temperature tank, includes salt bath constant temperature tank, divide into two communicating cavities along vertically through the baffle in the salt bath constant temperature tank, one of them is the stirring chamber, and another is the working chamber, is provided with agitating unit in the stirring chamber.
The fixed point fixing device is arranged in the working cavity, the upper end of the fixed point fixing device is isolated from the inner wall of the upper end of the working cavity through a heat insulation material, the edge of the upper end of the fixed point fixing device is in sealing connection with the inner wall of the upper end of the working cavity, the lower end of the fixed point fixing device is arranged on the inner wall of the lower end of the working cavity through a supporting rod, and a fixed point container device is arranged in the fixed point fixing device.
The edge of the upper end of the fixed point fixing device is in sealing connection with the inner wall of the upper end of the working cavity through laser welding.
The fixed point fixing device comprises three vertical rods which are longitudinally arranged in parallel, a plurality of supporting rings which are longitudinally arranged are fixed on the vertical rods, a flange is fixed at the top of each vertical rod, the inner diameters of the rest supporting rings are equal to the inner diameters of the flanges except for the bottom supporting ring, the circle centers of the supporting rings and the flanges are on the same straight line, and the inner diameter of the bottom supporting ring is smaller than the inner diameter of the rest supporting ring and is used for supporting the fixed point container device placed in the supporting ring.
The fixed point container device comprises a metal shell, wherein a graphite container is arranged in the shell, and a high-purity fixed point metal body is placed in the graphite container.
The fixed point container device also comprises a thermometer trap arranged at the upper part of the graphite container, and a thermometer is arranged in the thermometer trap.
And a heat insulation plate is arranged between the thermometer trap and the outer wall of the fixed point fixing device.
The metal shell is prepared from high-temperature alloy GH718 with extremely strong corrosion resistance.
The temperature control precision of the salt bath constant temperature tank is 0.01 ℃, and the uniformity of a vertical temperature field is 20mK.
The upper limit of the high temperature field of the salt bath constant temperature tank is 700 ℃.
The stirring device comprises a motor arranged on the salt bath constant temperature tank and stirring paddles arranged on a power output rod of the motor. The stirring blade is configured, so that the flow of an internal high-temperature medium can be promoted, and the uniformity of a temperature field is ensured.
The salt bath constant temperature tank takes molten liquid salt as a medium, mechanical stirring is assisted, the formed high Wen Wenchang uniformity is comparable with that of a constant temperature oil tank, and the upper temperature limit can reach 700 ℃.
The temperature control precision of the constant temperature source device (i.e. the salt bath constant temperature tank) is improved to 0.01 ℃, and the uniformity of a temperature field can be improved to 20mK at 700 ℃, which is a major breakthrough compared with the current fixed-point dry body furnace device. The fixed point container is placed in a liquid tank with the temperature field uniformity of 20mK, and the level of the fixed point is greatly improved.
The salt bath constant temperature tank device performs sealing treatment, and as the fixed point container is the core of the whole fixed point device, the fixed point is ensured not to be damaged, and therefore, the fixed point container fixing device is arranged in the tank cavity, and the fixed point container device is ensured not to be damaged due to vibration. The fixing point container device can be placed between the fixing device and the fixing device, and the circulating heat transfer medium can ensure that the fixing point device can be heated uniformly, so that a uniform temperature field is provided for the reproduction process of the fixing point.
Because of the characteristics of high-temperature melting and low-temperature solidification of the medium in the salt tank, the fixed point device placed in the tank cavity is required to be capable of bearing high-pressure load, and therefore the shell of the fixed point container device adopts a metal shell.
Because the medium in the salt tank is inorganic salt, the medium is polluted, so that the uniformity of a temperature field is possibly disturbed, the most easily polluted medium is the metal shell of the fixed point container device which is in direct contact with the medium, and oxides after the metal is oxidized at high temperature fall off, so that the temperature field in the tank cavity is directly uneven, and the recurrence level of the fixed point is further affected; the metal shell has a deepened oxidation level, which may lead to rupture of the fixing points and overflow, which directly endangers the personal safety of field personnel. Therefore, the fixing point device needs to be protected by a high-temperature-resistant and corrosion-resistant metal shell.
Compared with the prior art, the invention has the following technical effects:
according to the invention, the fixed point is combined with the salt bath by utilizing the excellent temperature field index of the existing salt bath constant temperature bath, so that a better temperature field environment is provided for the reproduction of the fixed point, and the high-level reproduction of the fixed point is achieved.
The fixed point container is protected by using high-temperature-resistant, oxidation-resistant and corrosion-resistant metal, so that the safety of the fixed point is ensured, and meanwhile, the safe and smooth implementation of the fixed point reproduction flow is also ensured.
And 3, the fixed point container fixing device is arranged in the groove cavity, so that the fixed point container device is ensured not to be damaged due to vibration.
Drawings
FIG. 1 is a schematic diagram of one embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the fixed point container fixing device of the present invention;
In the figure, a salt bath constant temperature tank 1, a working cavity 3, a thermometer trap 4, a fixed point container device 5, a stirring cavity 6, stirring paddles 7, a fixed point fixing device 8, a supporting rod 9, a vertical rod 10, a supporting ring 11 and a flange.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The structures, proportions, sizes, etc. shown in the drawings attached hereto are for illustration purposes only and are not intended to limit the scope of the invention, which is defined by the claims, but rather by the claims. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
As shown in fig. 1, the fixed point device based on the temperature control high-precision salt bath constant temperature tank comprises a salt bath constant temperature tank 1, wherein the inside of the salt bath constant temperature tank 1 is divided into two communicated cavities along the longitudinal direction through a partition plate, one cavity is a stirring cavity 5, the other cavity is a working cavity 2, and a stirring device is arranged in the stirring cavity 5.
The working chamber 2 is provided with a fixed point fixing device 7, the upper end of the fixed point fixing device 7 is isolated from the inner wall of the upper end of the working chamber 2 through a heat insulation material, the edge of the upper end of the fixed point fixing device 7 is in sealing connection with the inner wall of the upper end of the working chamber 2, the lower end of the fixed point fixing device 4 is arranged on the inner wall of the lower end of the working chamber 2 through a supporting rod 8, the lower end of the fixed point fixing device 7 is welded by the supporting rod 8 so as to increase the load bearing capacity of the fixing device, and a fixed point container device 4 is arranged inside the fixed point fixing device 7.
As shown in fig. 2, the edge of the upper end of the fixing point fixing device 7 is in sealing connection with the inner wall of the upper end of the working cavity through laser welding.
The fixed point fixing device 7 comprises three vertical rods 9 which are longitudinally arranged in parallel, a plurality of supporting rings 10 which are arranged in parallel are fixed on the vertical rods 9, a flange 11 is fixed at the top of the vertical rods 9, and the flange 11 is in sealing connection with the inner wall of the upper end of the working cavity through laser welding. The inner diameter of the rest of the support rings 10 is equal to the inner diameter of the flange 11 except for the bottommost support ring 10, and the inner diameter of the bottommost support ring 10 is smaller than the inner diameter of the rest of the support rings 10 on the same straight line at the center of the support ring 10 and the flange 11 for supporting the fixed point container means 4 placed in the support ring 10.
The fixed point container device 4 comprises a metal shell, wherein a graphite container is arranged in the shell, and a high-purity fixed point metal body is arranged in the graphite container. Because the heat transfer medium in the salt tank has the characteristics of high-temperature melting and low-temperature solidification, the fixed point device placed in the tank cavity is required to bear high-pressure load, and therefore the fixed point shell adopts a metal shell. Because the medium in the salt tank is inorganic salt, the medium is polluted, so that the uniformity of a temperature field is possibly disturbed, the most easily polluted medium is the metal shell of the fixed point container device which is in direct contact with the medium, and oxides after the metal is oxidized at high temperature fall off, so that the temperature field in the tank cavity is directly uneven, and the recurrence level of the fixed point is further affected; the metal shell has a deepened oxidation level, which may lead to rupture of the fixing points and overflow, which directly endangers the personal safety of field personnel. Therefore, the fixing point device needs to be protected by a high-temperature-resistant and corrosion-resistant metal shell. The metal shell with high temperature resistance and corrosion resistance can effectively resist the stress brought by the shell with multiple fixing points when the medium in the groove cavity expands, and the fixing point device is prevented from being damaged. The metal shell is made of high-temperature resistant, oxidation resistant and corrosion resistant metal, and can also effectively prevent the heat transfer medium in the groove cavity from being polluted.
Since the fixed point container is the core of the whole fixed point device, it is important to ensure that the fixed point is not damaged, and therefore, the fixed point container fixing device is arranged inside the groove cavity, and the fixed point container device is ensured not to be damaged due to vibration. The circulating heat transfer medium can ensure that the fixed point device can be heated uniformly during the period of putting the fixed point container device in the fixed point fixing device, so that a uniform temperature field is provided for the reproduction process of the fixed point.
The fixed point container device 4 also comprises a thermometer trap 3 arranged at the upper part of the graphite container, and a thermometer is arranged in the thermometer trap. A heat insulation plate is arranged between the thermometer trap 3 and the outer wall of the fixed point fixing device 7, and the heat insulation plate performs heat insulation protection, so that heat diffusion is avoided to a certain extent, and further, a uniform temperature field required by the reproduction of the fixed point is ensured.
The metal shell is prepared from high-temperature alloy GH718 with extremely strong corrosion resistance.
The temperature control precision of the salt bath constant temperature tank 1 is 0.01 ℃, and the uniformity of the vertical temperature field is 20mK. The upper temperature limit of the salt bath thermostat 1 at a height Wen Wenchang is 700 ℃.
The stirring device comprises a motor arranged on the salt bath constant temperature tank 1 and a stirring blade 6 arranged on a power output rod of the stirring device, so as to ensure that a medium continuously circulates in the tank cavity and ensure the uniformity of a temperature field in the tank cavity.
The temperature control precision of the constant temperature source device (i.e. the salt bath constant temperature tank) is improved to 0.01 ℃, and the uniformity of a temperature field can be improved to 20mK at 700 ℃, which is a major breakthrough compared with the current fixed-point dry body furnace device. The fixed point container is placed in a liquid tank with the temperature field uniformity of 20mK, and the level of the fixed point is greatly improved.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. The fixed point device based on the temperature control high-precision salt bath constant temperature tank is characterized by comprising a salt bath constant temperature tank, wherein the salt bath constant temperature tank is longitudinally divided into two communicated cavities by a partition plate, one of the cavities is a stirring cavity, the other cavity is a working cavity, a stirring device is arranged in the stirring cavity, and a fixed point fixing device is arranged in the working cavity;
the upper end of the fixed point fixing device is isolated from the inner wall of the upper end of the working cavity through a heat insulation material, the edge of the upper end of the fixed point fixing device is in sealing connection with the inner wall of the upper end of the working cavity, the lower end of the fixed point fixing device is arranged on the inner wall of the lower end of the working cavity through a supporting rod, and a fixed point container device is arranged in the fixed point fixing device;
the fixed point fixing device comprises three vertical rods which are longitudinally arranged in parallel, a plurality of supporting rings which are longitudinally arranged are fixed on the vertical rods, a flange is fixed at the top of each vertical rod, the inner diameters of the rest supporting rings are equal to the inner diameters of the flanges except for the bottom supporting ring, the circle centers of the supporting rings and the flanges are on the same straight line, and the inner diameter of the bottom supporting ring is smaller than the inner diameter of the rest supporting ring and is used for supporting the fixed point container device placed in the supporting ring.
2. The fixed point device based on the temperature-control high-precision salt bath constant temperature tank according to claim 1, wherein the edge of the upper end of the fixed point device is in sealing connection with the inner wall of the upper end of the working cavity through laser welding.
3. The fixed point device based on the temperature-control high-precision salt bath constant temperature tank according to claim 1, wherein the fixed point container device comprises a metal shell, a graphite container is arranged in the shell, and a high-purity fixed point metal body is placed in the graphite container.
4. A fixed point device based on a temperature-controlled high-precision salt bath constant temperature tank according to claim 3, wherein the fixed point container device further comprises a thermometer trap arranged at the upper part of the graphite container, and a thermometer can be placed in the thermometer trap.
5. The fixed point device based on the temperature-control high-precision salt bath constant temperature tank according to claim 4, wherein a heat insulation plate is arranged between the thermometer trap and the outer wall of the fixed point fixed device.
6. A fixed point device based on a temperature-controlled high-precision salt bath constant temperature tank according to claim 3, wherein the metal shell is prepared from high-temperature alloy GH718 with extremely strong corrosion resistance.
7. The fixed point device based on the temperature-control high-precision salt bath constant temperature tank according to claim 1, wherein the temperature-control precision of the salt bath constant temperature tank is 0.01 ℃, and the vertical temperature field uniformity is 20mK; the upper limit of the high temperature field of the salt bath constant temperature tank is 700 ℃.
8. The fixed point device based on the temperature-control high-precision salt bath constant temperature tank according to claim 1, wherein the stirring device comprises a motor arranged on the salt bath constant temperature tank and a stirring blade arranged on a power output rod of the stirring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910355057.6A CN109967152B (en) | 2019-04-29 | 2019-04-29 | Fixed point device based on accuse temperature high accuracy salt bath constant temperature groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910355057.6A CN109967152B (en) | 2019-04-29 | 2019-04-29 | Fixed point device based on accuse temperature high accuracy salt bath constant temperature groove |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109967152A CN109967152A (en) | 2019-07-05 |
| CN109967152B true CN109967152B (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910355057.6A Active CN109967152B (en) | 2019-04-29 | 2019-04-29 | Fixed point device based on accuse temperature high accuracy salt bath constant temperature groove |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490982A (en) * | 1982-10-18 | 1985-01-01 | Planer Products Limited | Method of and apparatus for the controlled cooling of a product |
| CN102279065A (en) * | 2011-03-03 | 2011-12-14 | 中国计量科学研究院 | Automatic recurring device for gallium fixed points |
| CN104251750A (en) * | 2014-09-04 | 2014-12-31 | 北京三原兆兴科技有限公司 | Water triple-point bottle automatic freezing and storage device and method |
| CN105092096A (en) * | 2015-05-05 | 2015-11-25 | 山东省计量科学研究院 | Method and device for temperature calibration by means of benzoic acid freezing point temperature level ground |
| CN209968446U (en) * | 2019-04-29 | 2020-01-21 | 济南长峰致远仪表科技有限公司 | Fixed point device based on temperature control high-precision salt bath thermostatic bath |
-
2019
- 2019-04-29 CN CN201910355057.6A patent/CN109967152B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4490982A (en) * | 1982-10-18 | 1985-01-01 | Planer Products Limited | Method of and apparatus for the controlled cooling of a product |
| CN102279065A (en) * | 2011-03-03 | 2011-12-14 | 中国计量科学研究院 | Automatic recurring device for gallium fixed points |
| CN104251750A (en) * | 2014-09-04 | 2014-12-31 | 北京三原兆兴科技有限公司 | Water triple-point bottle automatic freezing and storage device and method |
| CN105092096A (en) * | 2015-05-05 | 2015-11-25 | 山东省计量科学研究院 | Method and device for temperature calibration by means of benzoic acid freezing point temperature level ground |
| CN209968446U (en) * | 2019-04-29 | 2020-01-21 | 济南长峰致远仪表科技有限公司 | Fixed point device based on temperature control high-precision salt bath thermostatic bath |
Non-Patent Citations (2)
| Title |
|---|
| 基于准绝热的锌固定点复现装置;王伟等;《计量学报》;第37卷(第6期);591-595页 * |
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