CN114877548B - Instrument thermal protection device under low temperature environment - Google Patents

Instrument thermal protection device under low temperature environment Download PDF

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Publication number
CN114877548B
CN114877548B CN202210439961.7A CN202210439961A CN114877548B CN 114877548 B CN114877548 B CN 114877548B CN 202210439961 A CN202210439961 A CN 202210439961A CN 114877548 B CN114877548 B CN 114877548B
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China
Prior art keywords
heat
heat insulation
section
underground
box
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CN202210439961.7A
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Chinese (zh)
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CN114877548A (en
Inventor
陈菲
张玉峰
董文怡
董双双
叶存李
董金捷
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Daqing Gaofu Technology Development Co ltd
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Daqing Gaofu Technology Development Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/40—Geothermal collectors operated without external energy sources, e.g. using thermosiphonic circulation or heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Abstract

The invention discloses an instrument thermal protection device in a low-temperature environment, which comprises: an underground heat pipe and an insulation can; the condensation section of the buried heat pipe is inserted into the heat insulation box from the bottom of the heat insulation box, and the evaporation section of the buried heat pipe is buried underground; the heat insulation section of the underground heat pipe is sleeved with a heat insulation sleeve, and the inside of a closed space formed between the heat insulation section of the underground heat pipe and the heat insulation sleeve is vacuum; the inside of the heat preservation box is provided with a phase change energy storage mechanism; the underground heat pipe is filled with low boiling point working medium. The invention can solve the problems of low instrument precision, large error and even damage of the instrument in a low-temperature environment.

Description

Instrument thermal protection device under low temperature environment
Technical Field
The invention relates to the technical field of instruments, in particular to an instrument thermal protection device in a low-temperature environment.
Background
The instruments for detection, display and measurement are widely applied in industrial production, the temperature condition of the general industrial field environment and the temperature range of the working environment of the instruments designed by manufacturers have large deviation, the deviation of the temperature of the working environment of the instruments brings additional errors to the detection and measurement results, and the errors can not be ignored. In the existing meters, the metering accuracy of a flow meter, a pressure meter and the like is remarkably reduced in a low-temperature environment, the signal transmission interruption is caused by electrode leakage caused by serious expansion and contraction of heat and cold of a lining material of a conventional detection and metering meter in the low-temperature environment, and the phenomenon generally exists in actual detection and metering. Furthermore, changes in ambient temperature will also directly affect the components of the electronic part and the sensor part of the meter, causing the meter to malfunction or stop working.
The requirement of instruments used in various industries on the environmental temperature is generally above minus 20 ℃, but the measurement precision of the instruments used in the low-temperature environmental temperature is greatly reduced, the error of the measurement result is increased, and the adverse effects on the aspects of product quality, production efficiency and the like are caused. In addition, the failure rate of the instrument is greatly increased in a low-temperature environment, and the phenomenon of freezing is easy to occur. Therefore, it is necessary to design a thermal protection device that can ensure the normal operation of the meter in a low temperature environment and has high metering accuracy. The existing heating and heat-insulating device needs to be connected with heated electrical equipment and the like when the temperature is too low, needs to provide certain electric energy or other energy sources for heating, and needs to be frequently heated for a long time when the ambient temperature is too low and the heat-insulating effect of the heat-insulating device is not good, thereby causing energy waste. In addition, in some application scenarios (such as the field, etc.), no power supply facility can be found at all. Therefore, it is urgently required to develop a thermal protection device for an instrument which makes full use of the natural environment.
Disclosure of Invention
In view of the above, the present invention provides a thermal protection device for an instrument in a low temperature environment, so as to solve the problem that when the temperature of the working environment of the instrument is lower than the allowable temperature of the working environment, the accuracy of the instrument is affected, and even the instrument is damaged, so that the instrument stops detection and metering; when utilizing current heating heat preservation device to heat the instrument and keeping warm, if ambient temperature is low excessively or when the heat preservation effect is not good, need consume the problem that a large amount of energy heats the instrument.
The invention provides a thermal protection device for an instrument in a low-temperature environment, which comprises: an underground heat pipe and an insulation can;
the buried heat pipe includes: the condensation section of the buried heat pipe is inserted into the heat insulation box from the bottom of the heat insulation box, and the evaporation section of the buried heat pipe is buried underground;
a heat insulation sleeve is sleeved outside the heat insulation section, the top of the heat insulation sleeve is hermetically connected with the bottom of the heat insulation box, a closed space is formed between the heat insulation section and the heat insulation sleeve, the inside of the closed space is vacuum, and the heat insulation sleeve is used for insulating the heat insulation section;
the heat insulation box is internally provided with a phase change energy storage mechanism which is used for storing or releasing heat;
the underground heat pipe is used for carrying out boiling phase change heat exchange through the temperature difference between the low-boiling point working medium in the evaporation section and an underground soil layer, so that underground heat is guided into the insulation can.
Preferably, the method further comprises the following steps: a bionic heat insulation outer layer;
the bionic heat insulation outer layer is arranged outside the heat preservation box and comprises a plurality of bionic heat insulation pipes;
the bionic heat insulation pipe is of a dense porous structure, the bionic heat insulation outer layer is formed by arranging a plurality of bionic heat insulation pipes in parallel, and the bionic heat insulation outer layer is wrapped outside the heat preservation box and used for further preserving heat of the heat preservation box and internal instruments of the heat preservation box.
Preferably, the method further comprises the following steps: a heat sink;
the radiating fins are arranged outside the condensing section of the underground heat pipe in the heat insulation box and used for accelerating the heat radiation of the condensing section of the underground heat pipe.
Preferably, the diameter of the condensation section is larger than the diameters of the insulation section and the evaporation section.
Preferably, the phase change energy storage mechanism comprises a phase change energy storage material;
the phase change energy storage material is as follows: saline solution or ethylene glycol aqueous solution.
Preferably, the box body of the incubator comprises a plurality of layers of heat insulation outer plates, and each layer of heat insulation outer plate is detachably connected;
a first cavity is formed between every two adjacent heat insulation outer plates, and the interior of the first cavity is vacuum.
Preferably, the method further comprises the following steps: a heat conducting mechanism;
the heat conduction mechanism is located inside the heat insulation box and is in contact with the phase change energy storage mechanism, and the heat conduction mechanism is used for accelerating the heat dissipation of the phase change energy storage mechanism.
Preferably, the heat conducting mechanism includes: a heat conducting plate and fins;
the heat-conducting plate is arranged in the heat-insulating box, one side of the heat-conducting plate is in contact with the phase change energy storage mechanism, and the other side of the heat-conducting plate is provided with the fins.
Preferably, the inner wall of the underground heat pipe is provided with a strip-shaped groove, the directions of two ends of the strip-shaped groove are consistent with the directions of two ends of the underground heat pipe, and the strip-shaped groove is used for increasing the axial heat transfer capacity of the underground heat pipe.
Preferably, the method further comprises the following steps: a temperature sensor;
and a temperature probe of the temperature sensor is arranged in the heat insulation box and used for detecting the temperature in the heat insulation box.
The invention has the following beneficial effects:
the invention provides an instrument heat protection device in a low-temperature environment, which is characterized in that an underground heat pipe is arranged to transmit heat of an underground heat supply pipeline into a heat preservation box so as to increase the temperature around an instrument; the phase change energy storage mechanism is arranged to release the heat stored in the phase change into the heat preservation box; the phase change energy storage mechanism and the instrument are insulated by arranging the insulation box; through setting up insulation support and thermal-insulated gas, keep warm to buried heat pipe to can be under the condition that does not need other heating energy such as extra consumption electric energy, effectively heat and keep warm to the instrument, guarantee the testing result and the measurement accuracy of instrument under low temperature environment.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an instrument thermal protection device in a low-temperature environment in an embodiment of the invention.
FIG. 2 is a schematic structural diagram of a bionic thermal insulation pipe in an embodiment of the invention.
Figure 3 is a cross-sectional view of a biomimetic insulated tube in an embodiment of the present invention.
FIG. 4 is a schematic structural view of an outer insulating plate according to an embodiment of the present invention.
FIG. 5 is a schematic structural diagram of an underground heat pipe according to an embodiment of the present invention.
Fig. 6 is a sectional view of a buried heat pipe in an embodiment of the present invention.
In the figure, 1-buried heat pipe, 2-insulation box, 3-insulation sleeve, 4-closed space, 5-phase change energy storage mechanism, 6-heat conducting plate, 7-fin, 8-bionic heat insulation pipe, 9-radiating fin, 10-first cavity, 11-strip groove, 12-temperature sensor, 14-heat insulation outer plate, 15-condensation section, 16-heat insulation section, 17-evaporation section and 18-low boiling point working medium.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
Fig. 1 is a schematic structural diagram of an instrument thermal protection device in a low-temperature environment in an embodiment of the invention. FIG. 2 is a schematic structural diagram of a bionic thermal insulation pipe in an embodiment of the invention. Figure 3 is a cross-sectional view of a biomimetic insulated tube in an embodiment of the present invention. FIG. 4 is a schematic structural view of an outer insulating plate according to an embodiment of the present invention. FIG. 5 is a schematic structural diagram of an underground heat pipe according to an embodiment of the present invention. Fig. 6 is a sectional view of a buried heat pipe in an embodiment of the present invention. As shown in fig. 1, 2, 3, 4, 5, and 6, a thermal protection device for an instrument in a low-temperature environment includes: an underground heat pipe 1 and an insulation can 2; the buried heat pipe 1 includes: the underground heat pipe comprises a condensation section 15, a heat insulation section 16 and an evaporation section 17, wherein the condensation section 15 of the underground heat pipe 1 is inserted into the heat insulation box 2 from the bottom of the heat insulation box 2, and the evaporation section 17 of the underground heat pipe 1 is buried underground; the heat insulation section 16 is sleeved with a heat insulation sleeve 3, the top of the heat insulation sleeve 3 is hermetically connected with the bottom of the heat insulation box 2, a closed space 4 is formed between the heat insulation section 16 and the heat insulation sleeve 3, the inside of the closed space 4 is vacuum, and the heat insulation sleeve 3 is used for insulating the heat insulation section 16; the heat preservation box 2 is internally provided with a phase change energy storage mechanism 5, and the phase change energy storage mechanism 5 is used for storing or releasing heat; the underground heat pipe (1) is characterized in that the evaporation section (17) of the underground heat pipe (1) is filled with liquid low-boiling-point working medium (18), the condensation section (15) and the heat insulation section (16) are filled with gaseous low-boiling-point working medium (18), and the underground heat pipe (1) is used for carrying out boiling phase change heat exchange through the temperature difference between the low-boiling-point working medium (18) in the evaporation section (17) and an underground soil layer, so that underground heat is guided into the heat preservation box.
In the embodiment of the invention, when a cold tide comes and winter is cold outdoors and the ground is coldest, the environment temperature of the instrument during working can reach below-20 ℃ and can reach below-40 ℃ in extreme cases, and the cold wave can not influence the deep layer of the soil quickly, so that the coldest period appearing below the ground is much later than the ground, the underground temperature is much higher than the air temperature in a severe cold state, when the cold tide cold air comes and is greatly cooled in winter, the air temperature drops suddenly and greatly, but can not influence the deep layer of the soil quickly, and the underground temperature is approximately kept to be the average temperature of the local year.
The instrument is usually installed on an outdoor pipeline for use, when the instrument installed on the pipeline needs to be heated and insulated, the insulation box 2 is covered outside the pipeline with the instrument, through holes are formed in the two outer plates on the left side and the right side of the insulation box 2, and the instrument is clamped on the pipeline where the instrument is located, so that the instrument is placed inside the insulation box 2.
The underground heat pipe 1 is vertically arranged; the condensing section 15 of the underground heat pipe 1 is positioned in the heat insulation box 2, the evaporating section 17 is buried underground, the inside of the underground heat pipe 1 is vacuum, the evaporating section 17 is filled with liquid low-boiling point working medium 18 in the vacuum state, the condensing section 15 and the heat insulating section 16 are filled with gaseous low-boiling point working medium 18, the gaseous low-boiling point working medium 18 in the condensing section 15 is condensed into liquid under the external cold action, and then the liquid low-boiling point working medium 18 flows back to the evaporating section 17 under the gravity action. When the temperature drops, the low boiling point working medium 18 buried in the underground evaporation section 17 exchanges heat with the underground soil layer, the temperature of the low boiling point working medium 18 rises to generate steam after being heated and boiled, the low boiling point working medium rises upwards to the condensation section 15 in the underground heat pipe 1 to be condensed to release heat, so that the temperature of the condensation section 15 in the heat insulation box 2 is quickly raised, and when the heat is dissipated, instruments and air in the heat insulation box 2 are heated; meanwhile, the heat preservation box 2 can preserve heat inside the box. The heat insulation sleeve 3 sleeved outside the heat insulation section 16 of the underground heat pipe 1, and the space between the heat insulation sleeve 3 and the underground heat pipe 1 are vacuum, and are used for insulating the heat insulation section 16 of the underground heat pipe 1 above the ground and outside the heat insulation box 2, and preventing the heat of the low-boiling point working medium 18 from quickly losing through the outer wall of the underground heat pipe 1. Wherein, the working medium 18 with low boiling point can be a refrigerant, such as ammonia, freon, and the like. The boiling point of the low boiling point working fluid 18 is generally below 0 ℃.
When the internal environment temperature of the heat preservation box 2 rises to be higher than 0 ℃, the phase change energy storage mechanism 5 in the heat preservation box 2 stores heat, when the temperature in the heat preservation box 2 is reduced to be lower than minus 5 ℃, the stored heat is released by the phase change energy storage mechanism 5, and the heat is transferred into the heat preservation box 2 to enable the temperature in the heat preservation box 2 to rise. The buried heat pipe 1 is made of metal, and may be made of copper alloy, carbon steel or other corrosion-resistant materials with good heat conductivity.
In the present invention, the method further comprises: a bionic heat insulation outer layer; the bionic heat insulation outer layer is arranged outside the heat preservation box 2 and comprises a plurality of bionic heat insulation pipes 8; the bionic heat insulation pipe 8 is of a dense porous structure, the bionic heat insulation pipes 8 are arranged in parallel to form the bionic heat insulation outer layer, and the bionic heat insulation outer layer is wrapped outside the heat insulation box 2 and used for further heat insulation of the heat insulation box 2 and internal instruments of the heat insulation box.
In the embodiment of the invention, the bionic heat-insulating material can be made of fiber materials or other existing bionic heat-insulating materials. The side wall of the bionic heat insulation pipe 8 is of a dense porous structure and simulates the characteristics of polar bear hair. The porous structure of the side wall of the bionic heat insulation pipe 8 and the internal hollow structure reduce heat transfer, so that the heat insulation of the heat insulation box 2 and the internal instruments thereof can be further insulated.
In the present invention, the method further comprises: a heat sink 9; the radiating fins 9 are arranged outside the condensing section 15 of the underground heat pipe 1 in the heat insulation box 2, and the radiating fins 9 are used for accelerating the heat radiation of the condensing section 15 of the underground heat pipe 1.
In the embodiment of the invention, a plurality of radiating fins 9 can be provided, a plurality of radiating fins 9 are uniformly sleeved outside the buried heat pipe 1 in the heat preservation box 2, and the radiating fins 9 are used for accelerating the heat dissipation of the buried heat pipe 1, so that the heat released by the ground heat pipe is transferred to the heat preservation box 2 in time. The heat sink 9 may be made of copper or aluminum, which has a good thermal conductivity.
In the present invention, the diameter of the condensation section 15 is larger than the diameters of the adiabatic section 16 and the evaporation section 17.
In the embodiment of the invention, the condensation section 15 of the buried heat pipe 1 is positioned in the insulation can 2 for heat dissipation, and the surface area of the condensation section 15 with a larger diameter is larger, so that the heat dissipation area can be increased; meanwhile, the diameter of the cavity in the condensation section 15 is larger, that is, the diameter of the cavity in the condensation section 15 is larger than the diameters of the cavities in the heat insulation section 16 and the evaporation section 17, so that more steam can be contained in the cavity of the condensation section 15 for condensation and heat dissipation due to larger space.
The diameter of the cavity in the evaporation section 17 is smaller, and the cavity of the evaporation section 17 is filled with a low-boiling-point working medium 18; the evaporation section 17 is buried underground, and the low boiling point working medium 18 of the evaporation section 17 is heated by underground heat, so that the working medium in the cavity of the evaporation section 17 is heated to generate steam, and the steam rises to the interior of the cavity of the condensation section 15 after passing through the heat insulation section 16 upwards to be condensed, thereby radiating the heat into the heat insulation box 2. The diameter of the evaporation section 17 is small, so that less working medium can be contained, the speed of generating steam by heating is higher, the diameter of the cavity in the heat insulation section 16 is small, the steam can enter the condensation section 15 more quickly, and the heat of the steam is prevented from losing in the upward movement process.
The heat insulation section 16 is wrapped by the heat insulation sleeve 3, the closed space 4 is formed between the heat insulation section 16 and the heat insulation sleeve 3, the closed space 4 is vacuum, the heat exchange thermal resistance between the heat insulation section 16 of the underground heat pipe 1 and the heat insulation sleeve 3 is increased, and the heat loss caused by the heat exchange between the heat insulation section 16 outside the heat insulation box 2 and the surrounding environment when the underground heat pipe 1 is above the ground in the working process is further reduced.
In the present invention, the phase change energy storage mechanism 5 includes a phase change energy storage material; the phase change energy storage material is a saline solution or an ethylene glycol aqueous solution.
In the embodiment of the invention, the inner plate is arranged in the heat preservation box 2; the phase change energy storage material is arranged between the inner plate and the heat insulation outer plate of the heat insulation box 2. The phase change energy storage material can absorb environmental heat at the temperature of more than 0 ℃ to store energy, and in a low-temperature environment, the phase change energy storage material is solidified and phase-changed to release heat at the temperature of less than-5 ℃ so as to transfer the generated heat into the heat preservation box 2 and increase the temperature in the heat preservation box 2.
In the invention, the box body of the incubator 2 comprises a plurality of layers of heat insulation outer plates 14, and each layer of heat insulation outer plate 14 is detachably connected; a first cavity 10 is formed between every two adjacent heat insulation outer plates 14, and the interior of the first cavity 10 is vacuum.
In the embodiment of the invention, each side of the box body of the incubator 2 is composed of a plurality of layers of heat insulation outer plates 14, and two adjacent heat insulation outer plates 14 are detachably connected. One side of the heat insulation outer plates 14 is provided with a groove, when the heat insulation outer plates are installed, one side of one heat insulation outer plate 14 is connected with the other side of the other heat insulation outer plate 14 through a bolt, so that the groove between the two heat insulation outer plates 14 forms a first cavity 10, and a sealing ring is installed between the two adjacent heat insulation outer plates 14 to seal the first cavity 10. Wherein, the material of thermal-insulated planking 14 can be low thermal conductivity materials such as aerogel, reduces the heat that the cavity scatters and disappears to low temperature environment in insulation can 2. A plurality of layers of heat insulation outer plates 14 form a multi-layer plate structure, and the first cavity 10 between every two adjacent layers of heat insulation outer plates 14 is in a vacuum environment, so that heat loss in the heat insulation box 2 is further reduced. The detachable heat insulation outer plate 14 is used for adjusting the temperature in the heat insulation box 2, when the temperature in the heat insulation box 2 is too high, a plurality of layers of the heat insulation outer plate 14 can be detached, the heat insulation capacity of the heat insulation box 2 is reduced, and heat exchange between the heat insulation box 2 and the external environment is increased, so that the temperature in the heat insulation box 2 is reduced; when the temperature in the incubator 2 is lost too fast, the heat preservation capability of the incubator 2 can be enhanced by adding a plurality of layers of heat insulation outer plates 14.
In the present invention, the method further comprises: a heat conducting mechanism; the heat conduction mechanism is located inside the heat insulation box 2 and is in contact with the phase change energy storage mechanism 5, and the heat conduction mechanism is used for accelerating the heat dissipation of the phase change energy storage mechanism 5.
In the present invention, the heat conducting mechanism includes: a heat conducting plate 6 and fins 7; the heat conduction plate 6 is positioned in the heat insulation box 2, one side of the heat conduction plate 6 is in contact with the phase change energy storage mechanism 5, and the other side of the heat conduction plate 6 is provided with the fins 7.
In the embodiment of the invention, one side of the heat conducting plate 6 is in contact with the inner plate of the heat insulation box 2, the other side of the heat conducting plate is provided with a plurality of uniformly distributed fins 7, the fins 7 can be rectangular, and two adjacent fins 7 are parallel to each other. When the phase change energy storage mechanism 5 releases heat through phase change, the heat conduction plate 6 in contact with the phase change energy storage mechanism rapidly conducts the heat to the fins 7, and the heat is dissipated and transferred into the heat preservation box 2 through the fins 7, so that the temperature in the heat preservation box 2 is raised. The heat conducting plate 6 and the fins 7 may be made of copper, copper-aluminum composite or steel material with good heat conducting property.
In the invention, the inner wall of the buried heat pipe 1 is provided with a strip-shaped groove 11, the directions of two ends of the strip-shaped groove 11 are consistent with the directions of two ends of the buried heat pipe 1, and the strip-shaped groove 11 is used for increasing the axial heat transfer capacity of the buried heat pipe 1.
In the embodiment of the invention, the inner wall of the buried heat pipe 1 is provided with a strip-shaped groove 11 which extends downwards from the inner wall of the condensation section 15 to the inner wall of the evaporation section 17, the strip-shaped groove 11 is used for generating steam when the working medium in the evaporation section 17 is heated, the steam is upwards condensed in the condensation section 15 and then turns into liquid working medium again, the liquid working medium is attached to the inner wall of the condensation section 15 and slides downwards along the inner wall of the condensation section 15 to return to the inside of the evaporation section 17, and the strip-shaped groove 11 can accelerate the speed of the fluid working medium condensed on the inner wall of the condensation section 15 to flow back to the evaporation section 17 downwards, so that the working medium in the buried heat pipe 1 can rapidly and circularly flow for heat exchange.
In the present invention, the method further comprises: a temperature sensor 12; the temperature probe of the temperature sensor 12 is installed inside the heat insulation box 2 and used for detecting the temperature inside the heat insulation box 2.
In the embodiment of the present invention, the temperature probe of the temperature sensor 12 is located inside the incubator 2, and the number of the outer insulating plates 14 of the incubator 2 can be adjusted by detecting the temperature change near the instrument inside the incubator 2 by the temperature sensor 12, thereby adjusting the temperature inside the incubator 2.
The instrument thermal protection device in the low-temperature environment of the invention utilizes the buried heat pipe 1 to improve the ambient temperature of the instrument and carries out thermal insulation through the thermal insulation outer plate 14 of the thermal insulation box 2 and the external bionic thermal insulation outer layer. The underground heat pipe 1 transfers underground heat to the heat insulation box 2 through internal working medium heating circulation heat exchange in low-temperature seasons. The phase change energy storage mechanism 5 stores heat or releases heat to the heat preservation box 2. A temperature condition meeting the factory design environment of the instrument is established in the heat preservation box 2, and the temperature interval requirement of normal work of the instrument is met, so that the conventional instrument can continuously and normally work under the conditions of cold air and cold environment temperature in winter, the measurement precision cannot be reduced, and the detection result is not influenced. In addition, each part of the invention can be disassembled and assembled according to the requirement, so that the later installation, maintenance and overhaul are more convenient.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions of equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (7)

1. A thermal protection device for an instrument in a low-temperature environment is characterized by comprising: an underground heat pipe (1) and an insulation can (2);
the buried heat pipe (1) includes: the underground heat pipe comprises a condensation section (15), a heat insulation section (16) and an evaporation section (17), wherein the condensation section (15) of the underground heat pipe (1) is inserted into the heat insulation box (2) from the bottom of the heat insulation box (2), and the evaporation section (17) of the underground heat pipe (1) is buried underground;
the diameter of the condensation section (15) is larger than the diameters of the insulation section (16) and the evaporation section (17);
a heat insulation sleeve (3) is sleeved outside the heat insulation section (16), the top of the heat insulation sleeve (3) is hermetically connected with the bottom of the heat insulation box (2), a closed space (4) is formed between the heat insulation section (16) and the heat insulation sleeve (3), the inside of the closed space (4) is vacuum, and the heat insulation sleeve (3) is used for insulating the heat insulation section (16);
the box body of the heat preservation box (2) comprises a plurality of layers of heat insulation outer plates (14), and each layer of heat insulation outer plate (14) is detachably connected;
one side of each heat insulation outer plate (14) is provided with a groove, a first cavity (10) is formed by the grooves between every two adjacent heat insulation outer plates (14), a sealing ring is arranged between every two adjacent heat insulation outer plates (14), and the interior of the first cavity (10) is vacuum;
the insulation can (2) is internally provided with a phase change energy storage mechanism (5), and the phase change energy storage mechanism (5) is used for storing or releasing heat;
the evaporation section (17) of the underground heat pipe (1) is filled with liquid low-boiling point working medium (18), the condensation section (15) and the heat insulation section (16) are filled with gaseous low-boiling point working medium (18), and the underground heat pipe (1) is used for carrying out boiling phase change heat exchange through the temperature difference between the low-boiling point working medium (18) in the evaporation section (17) and an underground soil layer so as to guide underground heat into the heat preservation box;
the buried heat pipe is characterized in that a strip-shaped groove (11) is formed in the inner wall of the buried heat pipe (1), the directions of two ends of the strip-shaped groove (11) are consistent with the directions of two ends of the buried heat pipe (1), and the strip-shaped groove (11) is used for increasing the axial heat transfer capacity of the buried heat pipe (1).
2. The thermal protection device for meters in low temperature environment according to claim 1, further comprising: a bionic heat insulation outer layer;
the bionic heat insulation outer layer is arranged outside the heat preservation box (2), and comprises a plurality of bionic heat insulation pipes (8);
the bionic heat insulation pipe (8) is of a dense porous structure, the bionic heat insulation pipes (8) are arranged in parallel to form the bionic heat insulation outer layer, and the bionic heat insulation outer layer is wrapped outside the heat insulation box (2) and used for further heat insulation of the heat insulation box (2) and internal instruments of the heat insulation box.
3. The thermal protection device for a meter in a low-temperature environment according to claim 1, further comprising: a heat sink (9);
the radiating fins (9) are arranged outside the condensing section (15) of the underground heat pipe (1) in the heat insulation box (2), and the radiating fins (9) are used for accelerating the heat radiation of the condensing section (15) of the underground heat pipe (1).
4. The thermal protection device for the instrument in the low-temperature environment is characterized in that the phase-change energy storage mechanism (5) comprises a phase-change energy storage material;
the phase change energy storage material is as follows: saline solution or ethylene glycol aqueous solution.
5. The thermal protection device for the instrument in the low-temperature environment according to any one of claims 1 to 4, further comprising: a heat conducting mechanism;
the heat conduction mechanism is located inside the heat insulation box (2), the heat conduction mechanism is in contact with the phase change energy storage mechanism (5), and the heat conduction mechanism is used for accelerating the heat dissipation of the phase change energy storage mechanism (5).
6. The thermal protection device for meters in low-temperature environment according to claim 5, wherein the heat conducting mechanism comprises: a heat conducting plate (6) and fins (7);
the heat-conducting plate (6) is arranged in the heat-insulating box (2), one side of the heat-conducting plate (6) is in contact with the phase change energy storage mechanism (5), and the other side of the heat-conducting plate (6) is provided with the fins (7).
7. The thermal protection device for meters in a low-temperature environment according to any one of claims 1 to 6, further comprising: a temperature sensor (12);
and a temperature probe of the temperature sensor (12) is arranged in the heat insulation box (2) and is used for detecting the temperature in the heat insulation box (2).
CN202210439961.7A 2022-04-25 2022-04-25 Instrument thermal protection device under low temperature environment Active CN114877548B (en)

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