CN115900128A - Low-temperature constant-temperature cold source utilizing adsorption latent heat - Google Patents
Low-temperature constant-temperature cold source utilizing adsorption latent heat Download PDFInfo
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- CN115900128A CN115900128A CN202211694038.4A CN202211694038A CN115900128A CN 115900128 A CN115900128 A CN 115900128A CN 202211694038 A CN202211694038 A CN 202211694038A CN 115900128 A CN115900128 A CN 115900128A
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Abstract
The invention discloses a low-temperature constant-temperature cold source utilizing adsorption latent heat. The invention provides a cold source for a cooling platform by utilizing the low-temperature constant-temperature cold source for adsorbing latent heat and the adsorption latent heat generated during the desorption of working medium gas. The device has no active moving part and has the characteristic of no vibration; the adsorption of the working medium gas on the surface of the adsorbent can be carried out in a large-range temperature region higher than the boiling point of the working medium gas, so that the cooling can be provided in a large temperature range; the device has the advantages of simple structure, easily obtained materials, convenient operation, low cost and the like.
Description
Technical Field
The invention relates to the field of low-temperature constant-temperature cold sources, in particular to a low-temperature constant-temperature cold source utilizing adsorption latent heat.
Background
The low-temperature constant-temperature environment is a necessary condition for realizing scientific technologies such as low-temperature micro-nano processing, low-temperature in-situ microscopic observation, high-precision infrared imaging, superconducting calorimeters and the like. These systems involving micro-nano-scale precision machining and observation are very sensitive to mechanical vibrations, and therefore impose extremely high low vibration requirements on the cryostat cold source providing the cryostat environment. On the other hand, in order to realize stable processing conditions and observation environments at different temperatures, it is very critical whether the low-temperature constant-temperature cold source can flexibly realize the cold supply in a larger temperature zone range.
The general low-temperature constant-temperature cold source can be obtained in two ways: the active type low-temperature refrigerator supplies cold and low-temperature liquid supplies cold.
The active low-temperature refrigerator can conveniently obtain refrigeration in a larger temperature area range by adopting a Stirling type refrigerator, a pulse tube type refrigerator, a G-M type refrigerator, a throttling type refrigerator and the like. However, these refrigerators often have active moving parts such as a compressor and a rotary valve, and have large mechanical vibration during operation, and cannot meet the requirement of the normal operation of the micro-nano machining/observation system on the mechanical vibration of the system.
The cryogenic liquid cooling technology adopts cryogenic liquids such as liquid nitrogen and liquid helium to evaporate and absorb heat to provide a cryogenic constant temperature cold source, and the system generally has low mechanical vibration. However, the cryogenic liquid cooling can only provide the temperature point of the boiling point of the liquid, such as 4K (-269 c) for liquid helium, 20K (-253 c) for liquid hydrogen, 27K (-246 c) for liquid neon, 77K (-196 c) for liquid nitrogen, etc., and the temperature of the cryogenic constant-temperature cold source cannot be flexibly adjusted in a wide temperature range.
Therefore, the traditional low-temperature constant-temperature cold source technology cannot meet the requirements of a micro-nano processing/observation system.
Disclosure of Invention
In order to provide a low-temperature constant-temperature cold source which has no vibration and can adjust the temperature for the technical fields of micro-nano processing, microscopic observation, high-precision optical imaging and the like, the invention provides a low-temperature constant-temperature cold source utilizing latent heat of adsorption, and adopts the following technical scheme:
the utility model provides an utilize low temperature constant temperature cold source of absorption latent heat, sets up adsorption container, and the adsorbent is filled in the adsorption container, is filled with working medium gas, utilizes the absorption latent heat that produces when working medium gas desorption to provide the cold source for cooling platform.
The adsorbent is a physical adsorbent material with high specific surface area, such as activated carbon, organic metal grid material, molecular sieve, silica gel and the like; the adsorbent can adsorb a large amount of working medium gas under the working conditions of high pressure and low temperature; by controlling the working medium gas to flow out of the adsorption container, the pressure in the container is reduced, the working medium gas adsorbed on the surface of the adsorbent is desorbed, and the gas desorption can absorb heat; the latent heat of adsorption generated by gas desorption is used for providing a vibration-free cold source, and refrigeration is provided for the cooling platform.
The working medium gas can be helium, hydrogen, neon, nitrogen or methane and other common low-temperature working medium gases; providing a cooling temperature zone (T) according to the need of a cold source L ～T H ) Different from (1), the boiling point T is preferably selected BP,Gas The lowest temperature T of the cooling temperature zone required L And the gas with lower adsorption capacity and larger adsorption latent heat is used as the working medium gas.
The adsorption of the working medium gas on the surface of the adsorbent can be carried out in a large-range temperature zone higher than the boiling point of the working medium gas, so that the adsorption container can provide cooling in a large temperature range; the adsorption latent heat is used as a cold source, so that the heat pump can cope with larger thermal shock and has better temperature stability.
In order to realize continuous and long-time cooling, the adsorption container can be arranged into a plurality of parallel connection and alternately works.
Further, a low temperature constant temperature cold source using adsorption latent heat, comprising: working medium storage tank, air supply valve, air exhaust valve, air supply and exhaust pipe, air exhaust interface, adsorption vessel, cooling platform, low-temperature liquid storage tank, cooling platform, thermal switch I, pressure gauge, thermometer I, thermometer II and heater I.
The working medium storage tank is connected with the room temperature end of the air supply and exhaust pipe through an air supply valve, and the low temperature end of the air supply and exhaust pipe is connected with the adsorption container; the room temperature end of the air supply and exhaust pipe is connected with an exhaust interface through an exhaust valve; a pressure gauge is arranged at the room temperature end of the air supply and exhaust pipe; the adsorption container is provided with a thermometer II and a heater I.
The low-temperature liquid storage tank is connected with the cooling platform through a thermal switch I; the low-temperature liquid storage tank is thermally connected with the adsorption container; the adsorption vessel is thermally connected with the cooling platform; the cooling platform is provided with a thermometer I, and a sample needing to be cooled is arranged on the cooling platform.
The cooling platform is made of metal with good heat conduction, such as aluminum, oxygen-free copper and the like; the cooling platform is provided with an interface thermally connected with the low-temperature liquid storage tank and the adsorption container, and is also provided with an interface for installing a sample to be cooled.
The gas supply valve is a stop valve, and is opened in the process of inflation, so that high-pressure working medium gas in the working medium storage tank is inflated into the adsorption container, and the valve is closed when the adsorption container provides cold energy; the exhaust valve is a control valve or a metering valve with accurate flow control, and when the adsorption container provides cold energy, the working medium gas in the adsorption container is controlled to be slowly exhausted by adjusting the opening of the exhaust valve.
The low-temperature liquid storage tank is filled with low-temperature liquid, such as liquid helium, liquid hydrogen, liquid neon or liquid nitrogen; the low-temperature liquid storage tank is used for providing a primary cold source without vibration by utilizing latent heat generated by evaporation of the low-temperature liquid.
The thermal connection can realize the transfer function of cold energy, and is used for transferring the cold energy of the low-temperature liquid storage tank to the adsorption container and the cooling platform to be precooled, and transferring the cold energy generated by the adsorption container to the cooling platform to cool the sample.
The thermal switch is a thermal control device capable of realizing thermal connection disconnection or connection, and has various different types such as a mechanical thermal switch, a gas gap thermal switch, a superconducting thermal switch and the like according to different principles; the thermal switch I is used for disconnecting the thermal connection between the cooling platform and the low-temperature liquid storage tank when the adsorption container works, isolating the thermal influence of the low-temperature liquid storage tank on the cooling platform, reducing the heating amount required by the heater I for controlling the temperature of the cooling platform and reducing the consumption of low-temperature liquid in the low-temperature liquid storage tank.
Preferably, a thermal switch II is further arranged between the low-temperature liquid storage tank and the adsorption container, and the thermal switch II is used for disconnecting the thermal connection between the adsorption container and the low-temperature liquid storage tank when the adsorption container works, so that the heating amount required by the heater I for controlling the temperature of the cooling platform is reduced, and the consumption of low-temperature liquid in the low-temperature liquid storage tank is reduced.
Preferably, the air supply and exhaust pipe is provided with a heater II, the room temperature end of the air supply and exhaust pipe is also provided with a thermometer III, and the thermometer III is used for opening the heater II when the adsorption container exhausts air, heating the exhausted cold air to room temperature, and avoiding the cold air from freezing room temperature components, such as a pressure gauge and an exhaust valve, to the too low temperature, which affects the normal work of the room temperature components and even damages the room temperature components.
Preferably, a flow controller I is arranged between the air supply valve and the air supply and exhaust room temperature end, and a flow controller II is arranged between the exhaust interface and the exhaust valve; the purpose of setting the flow controller I is to control the inflation quantity more accurately and realize a faster inflation process; the purpose of setting up flow controller II is for controlling the displacement more accurately, real-time for under the prerequisite that satisfies thermostatic control, reduce the heater I's that is used for the accuse temperature heating volume as far as possible, reduce the exhaust rate, prolong the cooling time.
Preferably, a vacuum pump is further arranged between the exhaust valve and the exhaust interface, and the vacuum pump is used for further evacuating the gas in the adsorption container, so that the cooling time is prolonged.
The working principle of the low-temperature constant-temperature cold source is that a low-temperature liquid storage tank is used as a vibration-free primary cold source, thermal switches I, II and III are closed, and an adsorption container, a cooling platform and a sample arranged on the cooling platform are precooled to an initial low-temperature T through heat conduction ini Wherein T is ini Slightly lower than T L (ii) a Opening an air supply valve and closing an exhaust valve while precooling the adsorption container, filling the working medium gas in the working medium storage tank into the adsorption container, cooling the filled room-temperature working medium gas to a low temperature in the adsorption container, and adsorbing a large amount of working medium gas to the surface of the adsorption material in the adsorption container along with the increase of the pressure in the adsorption container; when the pressure gauge connected to the room temperature end of the air supply and exhaust pipe reaches the preset pressure p ini While closing the air supply valveAnd when the pressure tends to be stable, the gas supply valve can be opened again for inflating, and after the inflating process is repeated for a plurality of times, the pressure of the adsorption container tends to the preset pressure p ini Temperature is stabilized at T ini (ii) a After the adsorption container is inflated, the thermal switches I and II are switched off, the heater I on the adsorption container is switched on, and the temperature of the cooling platform is controlled to be the set cooling temperature T set And simultaneously, an exhaust valve is opened, so that gas in the adsorption container is slowly discharged, the pressure in the adsorption container is gradually reduced, the gas is desorbed from the surface of the adsorbent, the heat is absorbed in the desorption process, and the cold quantity for maintaining the constant low temperature of the cooling platform is generated.
The beneficial effects of the invention are as follows:
technologies such as low-temperature micro-nano processing, low-temperature in-situ microscopic observation, high-precision infrared imaging, superconducting calorimeter and the like generally need a low-temperature constant-temperature cold source. The systems related to micro-nano-scale precision processing and observation are very sensitive to mechanical vibration, so that extremely high low-vibration requirements are provided for a low-temperature constant-temperature cold source providing a low-temperature constant-temperature environment. On the other hand, in order to realize stable processing conditions and observation environments at different temperatures, whether the low-temperature constant-temperature cold source can flexibly provide cold in a larger temperature zone range is very critical. At present, the general low-temperature constant-temperature cold source obtaining mode comprises active low-temperature refrigerator cold supply and low-temperature liquid cold supply, the active low-temperature refrigerator cold supply is provided with an active moving part and has larger vibration, the low-temperature constant-temperature cold source can not be flexibly adjusted in a larger temperature zone range, and the requirements of the technical field on the low-temperature constant-temperature cold source which has no vibration and can adjust the temperature in a large range can not be met.
In order to meet the requirements, the invention innovatively provides a low-temperature constant-temperature cold source utilizing latent heat of adsorption, and provides the cold source for the cooling platform by utilizing the latent heat of adsorption generated during desorption of working medium gas. The technical scheme has no active moving part and has the characteristic of no vibration; the adsorption of the working medium gas on the surface of the adsorbent can be carried out in a large-range temperature region higher than the boiling point of the working medium gas, so that the cooling can be provided in a large temperature range; the adsorption latent heat is used as a cold source, so that the heat pump can cope with larger thermal shock and has better temperature stability; the device has the advantages of simple structure, easily obtained materials, convenient operation and low cost.
Drawings
Fig. 1 is a schematic view of a first embodiment of a cryostat cold source utilizing latent heat of adsorption.
Fig. 2 is a schematic view of a second embodiment of a cryostat cold source utilizing latent heat of adsorption.
Fig. 3 is a schematic view of a third embodiment of a cryostat cold source utilizing latent heat of adsorption.
The corresponding relation between the reference numbers and the component names is as follows:
1. a working medium storage tank; 2. an air supply valve; 3. an exhaust valve; 4. an air supply and exhaust pipe; 5. an exhaust interface; 6. an adsorption vessel; 7. the system comprises a cooling platform, 8, a low-temperature liquid storage tank, 9, a thermal switch I, 10, a pressure gauge, 11, a temperature gauge I, 12, a temperature gauge II, 13, a heater I, 14, a sample to be cooled, 15, a thermal switch II, 16, a heater II, 17, a temperature gauge III, 18, a flow controller I, 19, a flow controller II, 20, a vacuum pump, 21, a gas supply valve a, 22, a gas supply valve b, 23, a gas supply main valve, 31, a gas exhaust valve a, 32, a gas exhaust valve b, 61, an adsorption container a, 62, an adsorption container b, 101, a pressure gauge a, 102, a pressure gauge b, 121, a temperature gauge II-a, 122, a temperature gauge II-b, 131, a heater I-a, 132, a heater I-b, 151, a thermal switch II-a, 152, a thermal switch II-b, 153, a thermal switch III-a, 154, a thermal switch III-b, 400, a convection type heat exchanger, 411, a supply and exhaust pipe warm end pipe a, 412, a supply and exhaust pipe low-temperature end pipe line 422.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are described in further detail below with reference to the accompanying drawings of the embodiments of the present invention, but the described embodiments are some, not all, embodiments of the present invention. Other embodiments based on the embodiments of the invention, which are not inventive by the person skilled in the art, are within the scope of protection of the invention.
Example 1:
as shown in fig. 1, the low-temperature constant-temperature cold source using latent heat of adsorption includes a working medium storage tank (1), an air supply valve (2), an exhaust valve (3), an air supply and exhaust pipe (4), an exhaust port (5), an adsorption container (6), a cooling platform (7), a low-temperature liquid storage tank (8), a thermal switch I (9), a pressure gauge (10), a thermometer I (11), a thermometer II (12), and a heater I (13).
The working medium storage tank (1) is connected with the room temperature end of the air supply and exhaust pipe (4) through the air supply valve (2), and the low temperature end of the air supply and exhaust pipe (4) is connected with the adsorption container (6); the room temperature end of the air supply and exhaust pipe (4) is connected with an exhaust interface (5) through an exhaust valve (3); a pressure gauge (10) is arranged at the room temperature end of the air supply and exhaust pipe (4); the adsorption container (6) is provided with a thermometer II (12) and a heater I (13).
The low-temperature liquid storage tank (8) is connected with the cooling platform (7) through a thermal switch I (9); the low-temperature liquid storage tank (8) is thermally connected with the adsorption container (6); the adsorption container (6) is thermally connected with the cooling platform (7); a thermometer I (11) is arranged on the cooling platform (7), and a sample (14) to be cooled is arranged on the cooling platform (7).
The steps and the principle for providing the low-temperature constant-temperature cold source for the sample to be detected by adopting the embodiment are as follows:
step 1: a thermal switch I (9) is turned on, a low-temperature liquid storage tank (8) pre-cools the cooling platform (7) and the adsorption container (6), and a sample (14) to be cooled is also pre-cooled simultaneously; the final cooling platform (7), the adsorption container (6) and the sample (14) to be cooled are precooled to the same temperature T as the low-temperature liquid in the low-temperature liquid storage tank (8) ini ＝T BP,Gas 。
Step 2: when the adsorption container (6) is precooled, the exhaust valve (3) is closed, the gas supply valve (2) is opened, the working medium gas in the working medium storage tank (1) is filled into the adsorption container (6), the filled room-temperature working medium gas is cooled to a low temperature in the adsorption container (6), and a large amount of working medium gas is adsorbed to the surface of the adsorption material in the adsorption container (6) along with the increase of the pressure in the adsorption container (6).
And step 3: when the pressure gauge (10) connected to the room temperature end of the air supply and exhaust pipe (4) reaches the preset pressure p ini When, the air supply valve is closed (2)And when the pressure tends to be stable, the gas supply valve (2) can be opened again to inflate, and after the inflation process is repeated for a plurality of times, the pressure of the adsorption container (6) tends to the preset pressure p ini Temperature is stabilized at T ini 。
And 4, step 4: after the adsorption container (6) is aerated, the thermal switch I (9) is disconnected, the heater I (13) on the adsorption container (6) is turned on, and the temperature of the cooling platform (7) is controlled to be the set cooling temperature T set And simultaneously, the exhaust valve (3) is opened, so that the gas in the adsorption container (6) is slowly discharged, along with the gradual reduction of the pressure in the adsorption container (6), the gas is desorbed from the surface of the adsorbent, the heat is absorbed in the desorption process, and the cold quantity for maintaining the constant low temperature of the cooling platform is generated.
Example 2:
as shown in fig. 2, a low temperature and constant temperature cold source using adsorption latent heat is different from example 1 in that: the low-temperature constant-temperature cold source further comprises a thermal switch II (15), a heater II (16), a thermometer III (17), a flow controller I (18), a flow controller II (19) and a vacuum pump (20). A thermal switch II (15) is arranged between the low-temperature liquid storage tank (8) and the adsorption container (6); a heater II (16) is arranged on the air supply and exhaust pipe (4), and a thermometer III (17) is also arranged at the room temperature end of the air supply and exhaust pipe (4); a flow controller I (18) is arranged between the air supply valve (2) and the room temperature end of the air supply and exhaust valve (4), and a flow controller II is arranged between the exhaust interface and the exhaust valve; and a vacuum pump (20) is also arranged between the flow controller II (19) and the exhaust interface (5).
The operation steps of this embodiment and embodiment 1 are as follows:
in the step 1, a thermal switch II (15) needs to be opened, so that the low-temperature liquid storage tank (8) is thermally connected with the adsorption container (6), and the adsorption container (6) and the working medium gas filled in the adsorption container are precooled.
Recording the mass and initial pressure p of the working medium gas filled into the adsorption container (6) in the steps 2 and 3 by using a flow controller I (18) ini And an initial temperature T ini Can quickly estimate the relation betweenWorking medium gas mass m actually required to be filled into the adsorption container (6) during secondary work is calculated ini Thus, in step 3, flow controller I (18) may be set to pass through m ini The working medium gas with mass is automatically closed, and the inflation process can be completed by one time.
In step 4, when the low-temperature constant-temperature cold source provides constant-temperature low-temperature cooling for the sample to be cooled, the thermal switch II (15) needs to be switched off; setting the exhaust flow rate of the flow rate controller II (19) so that the cooling platform (7) is stabilized at the set cooling temperature T set Meanwhile, the thermal compensation power required by the heater I (13) is as small as possible; when the pressure of the adsorption container (6) is lower than about 2bar, the vacuum pump (20) is started, so that the working time of the adsorption container (6) can be further prolonged; in the process of exhausting the adsorption container (6), the heater II (16) is turned on, the low-temperature working medium gas exhausted from the adsorption container (6) is heated to the room temperature (measured by a thermometer III (17) at the room temperature end of the gas supply and exhaust pipe), and the exhaust valve (3), the flow controller II (19) and the vacuum pump (20) which are positioned at the downstream are protected from being damaged by the low-temperature working medium gas.
Example 3:
in order to realize continuous and long-time cooling, two adsorption containers can be arranged in parallel and alternately work. As shown in fig. 3, the low-temperature constant-temperature cold source using adsorption latent heat comprises a working medium storage tank (1), an exhaust interface (5), a cooling platform (7), a low-temperature liquid storage tank (8), a thermal switch I (9), a thermometer I (11), a flow controller I (18), a flow controller II (19), a vacuum pump (20), an air supply valve a (21), an air supply valve b (22), an air supply main valve (23), an exhaust valve a (31), an exhaust valve b (32), an adsorption container a (61), an adsorption container b (62), a pressure gauge a (101), a pressure gauge b (102), a thermometer II-a (121), a thermometer II-b (122), a heater I-a (131), a heater I-b (132), a thermal switch II-a (151), a thermal switch II-b (152), a thermal switch III-a (153), a thermal switch III-b (154), a convection heat exchanger (400), an exhaust pipe room temperature end supply pipe a (411), an exhaust pipe a (412), an exhaust pipe temperature end supply pipe b (421 b) and a low temperature end pipe (422 b).
The working medium storage tank (1) is connected with an inlet of a flow controller I (18) through a gas supply main valve (23); the outlet of the flow controller I (18) is divided into two parallel paths, one path is connected with a pipeline a (411) at the room temperature end of the air supply and exhaust pipe through an air supply valve a (21), and the other path is connected with a pipeline b (421) at the room temperature end of the air supply and exhaust pipe; a pressure gauge a (101) is arranged on the room temperature end pipeline a (411) of the air supply and exhaust pipe and is connected with the hot end of the first path in the convection type heat exchanger (400); a pressure gauge b (102) is arranged on the room temperature end pipeline b (421) of the air supply and exhaust pipe and is connected with the hot end of the second path in the convection type heat exchanger (400); the indoor temperature end pipeline a (411) of the air supply and exhaust pipe and the indoor temperature end pipeline b (421) of the air supply and exhaust pipe are further connected with the flow controller II (19), the vacuum pump (20) and the exhaust interface (5) in sequence through an exhaust valve a (31) and an exhaust valve b (32) respectively; the cold end of the first path in the convection type heat exchanger (400) is connected with an adsorption container a (61) through a low-temperature end pipeline a (412) of an air supply and exhaust pipe, and the cold end of the second path in the convection type heat exchanger (400) is connected with an adsorption container b (62) through a low-temperature end pipeline b (422) of the air supply and exhaust pipe; a thermometer II-a (121) and a heater I-a (131) are arranged on the adsorption container a (61), and a thermometer II-b (122) and a heater I-b (132) are arranged on the adsorption container b (62); the adsorption container a (61) is connected with the low-temperature liquid storage tank (8) through a thermal switch II-a (151) and is connected with the cooling platform (7) through a thermal switch III-a (153); the adsorption container b (62) is connected with the low-temperature liquid storage tank (8) through a thermal switch II-b (152) and is connected with the cooling platform (7) through a thermal switch III-b (154); the low-temperature liquid storage tank (8) is connected with the cooling platform (7) through a thermal switch I (9); a thermometer I (11) is arranged on the cooling platform (7), and a sample (14) to be cooled is arranged on the cooling platform (7).
The steps and the principle for providing the low-temperature constant-temperature cold source for the sample to be detected by adopting the embodiment are as follows:
step 1: opening a thermal switch I (9), a thermal switch II-a (151) and a thermal switch II-b (152), and disconnecting a thermal switch III-a (153) and a thermal switch III-b (154); a low-temperature liquid storage tank (8) pre-cools the cooling platform (7), the adsorption container a (61) and the adsorption container b (62), and a sample (14) to be cooled is also pre-cooled simultaneously; the final cooling platform (7), the adsorption container a (61), the adsorption container b (62) and the sample to be cooled (14) are pre-cooled to the same temperature T as the low-temperature liquid in the low-temperature liquid storage tank (8) ini ＝T BP,Gas 。
Step 2: the method comprises the steps of pre-cooling an adsorption container a (61), closing an exhaust valve a (31) and an exhaust valve b (32), closing an air supply valve b (22), setting the accumulated mass of a flow controller I (18) to zero, then opening an air supply valve a (21), filling working medium gas in a working medium storage tank (1) into the adsorption container a (61), cooling the filled room-temperature working medium gas in the adsorption container a (61) to a low temperature, and adsorbing a large amount of working medium gas to the surface of an adsorption material in the adsorption container a (61) along with the increase of the pressure in the adsorption container a (61).
And step 3: when the pressure gauge a (101) reaches the preset pressure p ini When the gas supply valve a (21) is closed, the pressure in the adsorption container a (61) is further reduced as the gas in the adsorption container a (61) and the connecting pipeline thereof is further cooled and adsorbed to the surface of the adsorbent, when the pressure tends to be stable, the gas supply valve a (21) can be opened again for aeration, and after the aeration process is repeated for a plurality of times, the pressure of the adsorption container a (61) tends to the preset pressure p ini Temperature is stabilized at T ini (ii) a Recording the cumulative mass of the flow controller I (18) as m ini ；
And 4, step 4: after the adsorption container a (61) is aerated, disconnecting the thermal switch I (9) and the thermal switch II-a (151) and opening the thermal switch III-a (153); turning on the heater I-a (131), heating and controlling the temperature of the cooling platform (7) to the set cooling temperature T set Simultaneously, the air supply valve a (21) is closed, the exhaust valve a (31) is opened, and the exhaust flow of the flow controller II (19) is set so that the cooling platform (7) is stabilized at the set cooling temperature T set Meanwhile, the thermal compensation power required by the heater I-a (131) is as small as possible; when the reading of the pressure gauge a (101) is less than 2bar, the vacuum pump (20) is switched on; when the adsorption container a (61) provides constant-temperature low-temperature cooling for the cooling platform (7), the air supply valve b (22) is opened, and the air supply flow of the flow controller I (18) is set to be consistent with the exhaust flow of the flow controller II (19); at the moment, the working medium gas in the working medium storage tank (1) firstly passes through a second path of the convection type heat exchanger (400), is precooled by the working medium gas from the first path and discharged from the adsorption container a (61), and then is filled into the adsorption container b (62), and along with the increase of the pressure in the adsorption container b (62), a large amount of working medium gas is adsorbed to the adsorption container bThe surface of the adsorbent in the sub-tank b (62).
And 5: when the working medium gas in the adsorption container a (61) is exhausted, opening a thermal switch II-a (151) and a thermal switch III-b (154), and disconnecting a thermal switch II-b (152) and a thermal switch III-a (153); closing the exhaust valve a (31) and the air supply valve b (22), opening the air supply valve a (21) and the air exhaust valve b (32), switching the adsorption container a (61) to an inflation state, switching the adsorption container b (62) filled with the working medium gas to a working state, connecting the adsorption container b with the cooling platform (7), and continuously providing constant-temperature low-temperature cooling, wherein continuous constant-temperature low-temperature cooling can be provided by alternately switching.
Claims (10)
1. The low-temperature constant-temperature cold source is characterized in that the low-temperature constant-temperature cold source is provided with an adsorption container, an adsorbent is filled in the adsorption container, working medium gas is filled in the adsorption container, and the cold source is provided by utilizing the adsorption latent heat generated during desorption of the working medium gas.
2. The cold source for constant temperature and low temperature using latent heat of adsorption according to claim 1, wherein the adsorption container is provided in a plurality of parallel connection and alternately operated.
3. The low-temperature constant-temperature cold source using latent heat of adsorption according to claim 1, wherein the working gas is helium, hydrogen, neon, nitrogen, or methane.
4. The cryostat cold source using latent heat of adsorption according to claim 1, wherein said adsorbent is activated carbon, an organic metal mesh material, a molecular sieve or silica gel.
5. The low-temperature constant-temperature cold source utilizing latent heat of adsorption according to claim 1, comprising a working medium storage tank, an air supply valve, an air exhaust valve, an air supply and exhaust pipe, an air exhaust interface, an adsorption container, a cooling platform, a low-temperature liquid storage tank, a cooling platform, a thermal switch I, a pressure gauge, a thermometer I, a thermometer II and a heater I;
the working medium storage tank is connected with the room temperature end of the air supply and exhaust pipe through an air supply valve, and the low temperature end of the air supply and exhaust pipe is connected with the adsorption container; the room temperature end of the air supply and exhaust pipe is connected with an exhaust interface through an exhaust valve; a pressure gauge is arranged at the room temperature end of the air supply and exhaust pipe; a thermometer II and a heater I are arranged on the adsorption container;
the low-temperature liquid storage tank is connected with the cooling platform through a thermal switch I; the low-temperature liquid storage tank is thermally connected with the adsorption container; the adsorption vessel is thermally connected with the cooling platform; the cooling platform is provided with a thermometer I, and a sample needing to be cooled is arranged on the cooling platform.
6. The cold source for constant temperature and temperature using latent heat of adsorption according to claim 5, wherein a thermal switch II is provided between the cryogenic liquid storage tank and the adsorption container.
7. The cryostat cold source using latent heat of adsorption as claimed in claim 6, wherein said thermal switch I and thermal switch II are mechanical thermal switch, gas gap thermal switch or super-conductive thermal switch.
8. The cold source for constant temperature and temperature using latent heat of adsorption according to any one of claims 5 to 7, wherein the air supply and exhaust pipe is provided with a heater II, and the room temperature end of the air supply and exhaust pipe is further provided with a thermometer III.
9. The cold source for constant temperature and temperature using latent heat of adsorption according to any one of claims 5 to 7, wherein a flow controller I is provided between the air supply valve and the room temperature end of the air supply/exhaust chamber, and a flow controller II is provided between the exhaust port and the exhaust valve.
10. The cold source for constant temperature and temperature using latent heat of adsorption according to any one of claims 5 to 7, wherein a vacuum pump is further disposed between the exhaust valve and the exhaust port.
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| CN202211694038.4A CN115900128A (en) | 2022-12-28 | 2022-12-28 | Low-temperature constant-temperature cold source utilizing adsorption latent heat |
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| CN202211694038.4A CN115900128A (en) | 2022-12-28 | 2022-12-28 | Low-temperature constant-temperature cold source utilizing adsorption latent heat |
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