A cooling method for power cabinet

Abstract

The present invention relates to the technical field of electric devices, and in particular to a cooling method for an electric cabinet. An embodiment of the present invention provides a cooling method for an electric cabinet, comprising: using a circulation pipe filled with water to cool down the electrical device of the cabinet of the electric cabinet; wherein the circulation pipe is provided with a power device to drive the water in the circulation pipe to circulate; utilizing the thermal contraction of the preset temperature-sensitive hydrogel in the circulation pipe to accelerate the flow rate of the water in the circulation pipe; utilizing the flow rate of the water in the circulation pipe to adjust the downward pressure of the pressure plate in the circulation pipe; utilizing a transmission device to transmit the pressure of the pressure plate to a baffle in an output pipe for outputting a low-temperature fluid, so as to adjust the position of the baffle; adjusting the position of the baffle to adjust the flow rate of the low-temperature fluid output from the output pipe. An embodiment of the present invention provides a cooling method for an electric cabinet, which can reduce the entry of dust into the interior thereof.

Description

Technical Field

[0001] The invention relates to the technical field of electric devices, and in particular to a cooling method for an electric cabinet. Background Art

[0002] The power cabinet is a commonly used power device in power systems, used for power distribution and control.

[0003] Various electrical components in the power cabinet, such as fuses, contactors, transformers, etc., will generate a lot of heat during operation. It is necessary to install a fan inside the power cabinet and set ventilation holes on the surface of the power cabinet to remove the heat inside the power cabinet through air cooling. However, the cooling efficiency of air cooling is low, and a large amount of gas needs to continuously enter the power cabinet, resulting in a large amount of dust in the air entering the power cabinet, or dust attached to the filter, resulting in poor air flow and affecting the cooling efficiency.

[0004] Therefore, in view of the above-mentioned shortcomings, there is an urgent need for a cooling method for a power cabinet that can reduce the dust from entering the cabinet. Summary of the invention

[0005] An embodiment of the present invention provides a cooling method for a power cabinet, which can reduce the entry of dust into the interior of the power cabinet.

[0006] An embodiment of the present invention provides a cooling method for a power cabinet, comprising:

[0007] The electrical device of the cabinet of the power cabinet is cooled by using a circulating pipe filled with water; wherein the circulating pipe is provided with a power device to drive the water in the circulating pipe to circulate;

[0008] The flow rate of water in the circulation pipeline is accelerated by utilizing the thermal contraction of the temperature-sensitive hydrogel preset in the circulation pipeline;

[0009] The downward pressure of the pressing plate in the circulation pipeline is adjusted by using the flow rate of the water in the circulation pipeline;

[0010] The pressure of the pressure plate is transmitted to the baffle in the output pipeline for outputting the cryogenic fluid by using the transmission device, so as to adjust the position of the baffle;

[0011] The position of the baffle is adjusted to adjust the flow rate of the low-temperature fluid output by the output pipeline.

[0012] In one possible design, the cooling method further includes:

[0013] The output end of the output pipe is moved to output to different positions of the electrical device.

[0014] In a possible design, the step of moving the output end of the output pipe to output to different positions of the electrical device includes:

[0015] The output end of the output pipe is laterally moved above the electrical device to output to different positions of the electrical device.

[0016] In a possible design, the output pipe is connected to a plurality of output ends, and the output ends connected to the plurality of output pipes are transversely arranged on the upper part of the electrical device.

[0017] In a possible design, the cabinet is provided with an air vent, and the air vent is covered with a shape memory polymer that is deformed by temperature stimulation, and the shape memory polymer includes an initial shape of a plate, and the shape memory polymer in the initial shape blocks the air vent;

[0018] The cooling method further comprises:

[0019] When the temperature inside the cabinet is higher than a preset temperature and the pressure is higher than outside, the shape memory polymer softens and bends under the impact of airflow to release the gas inside the cabinet; wherein the preset temperature is the glass transition temperature of the shape memory polymer.

[0020] In a possible design, an electromagnet is provided on a side of the vent away from the shape memory polymer, magnetic particles are distributed inside the shape memory polymer, and the electromagnet is connected in series with a thermistor with a positive temperature coefficient;

[0021] The cooling method further comprises:

[0022] The temperature-sensitive resistor adjusts the current passing through the electromagnet according to the temperature to adjust the magnetic force of the electromagnet on the shape memory polymer;

[0023] The magnetic force of the electromagnet on the shape memory polymer is used to control the shape memory polymer to close or open the vent hole.

[0024] In a possible design, the air vent is disposed on the top of the cabinet.

[0025] In a possible design, a spring is connected between the pressure plate and the circulation pipe;

[0026] The cooling method further comprises:

[0027] The spring is used to lift the pressure plate when the water flow rate in the circulation pipe decreases.

[0028] In a possible design, the thermosensitive hydrogel with different phase transition temperatures is arranged in the circulation pipeline.

[0029] In a possible design, the temperature-sensitive hydrogel is fixedly disposed at different locations of the circulation pipeline.

[0030] Compared with the prior art, the present invention has at least the following beneficial effects:

[0031] When heat is dissipated, the water in the circulation pipe absorbs the heat of the electrical device first, cooling the electrical device. Through the water circulation in the circulation pipe, part of the high-temperature water in the part of the circulation pipe close to the electrical device flows, and the subsequent low-temperature water replenishment continues to absorb heat. Water has a high specific heat capacity and can absorb a sufficiently high amount of heat within a certain period of time. However, when the electrical device is operated at high power or for a long time, the overall temperature of the water in the circulation pipe rises and the cooling effect is weakened. At this time, the temperature of the thermosensitive hydrogel in the circulation pipe rises to the phase transition temperature, and water cooling is performed. When the water in the circulation pipe is heated to the phase transition temperature of the thermosensitive hydrogel, the thermosensitive hydrogel shrinks to a solid state, making the water flow rate in the circulation pipe faster, and then pressing down the pressure plate. The transmission device transmits the power of pressing the pressure plate down to the baffle through the transmission device, and the baffle is displaced to reduce the obstruction of the cross section of the output pipe, so that the outlet of the output pipe starts or increases the output of the cooling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 is a flow chart of a cooling method for a power cabinet provided by an embodiment of the present invention;

[0034] Figure 2 It is a structural schematic diagram of a power cabinet provided by an embodiment of the present invention.

[0035] In the figure:

[0036] 1-Cabinet;

[0037] 2- Gas cylinder;

[0038] 3-Electrical installations;

[0039] 4- Output pipeline;

[0040] 5-Circulation pipeline;

[0041] 6- Power plant;

[0042] 7-Thermosensitive hydrogel;

[0043] 8-Pressing plate;

[0044] 9- baffle;

[0045] 10-ventilation holes;

[0046] 11-Shape memory polymers;

[0047] 12- first transmission shaft;

[0048] 13- Hydraulic pipeline;

[0049] 14- second transmission shaft;

[0050] 15-First top plug;

[0051] 16- Second top plug;

[0052] 17- Spring;

[0053] 18-electromagnet;

[0054] 19-Thermostat. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0056] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present invention are described at the angles shown in the drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0058] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a cooling method for a power cabinet, comprising:

[0059] The electrical device 3 of the cabinet 1 of the power cabinet is cooled by using a circulating pipe 5 filled with water; wherein the circulating pipe 5 is provided with a power device 6 to drive the water in the circulating pipe 5 to circulate;

[0060] The flow rate of water in the circulation pipe 5 is accelerated by utilizing the heat contraction of the temperature-sensitive hydrogel 7 preset in the circulation pipe 5;

[0061] The downward pressure of the pressing plate 8 in the circulation pipe 5 is adjusted by using the flow rate of the water in the circulation pipe 5;

[0062] The pressure of the pressure plate 8 is transmitted to the baffle 9 in the output pipeline 4 for outputting the cryogenic fluid by using the transmission device, so as to adjust the position of the baffle 9;

[0063] The position of the baffle 9 is adjusted to adjust the flow rate of the low-temperature fluid output from the output pipeline 4 .

[0064] When heat is dissipated, the water in the circulation pipe 5 first absorbs the heat of the electrical device 3 to cool the electrical device 3. Through the water circulation in the circulation pipe 5, part of the high-temperature water in the part of the circulation pipe 5 close to the electrical device 3 flows, and the subsequent low-temperature water replenishment continues to absorb heat. Water has a high specific heat capacity and can absorb a sufficiently high amount of heat within a certain period of time. However, when the electrical device 3 is operated at high power or for a long time, the overall temperature of the water in the circulation pipe 5 rises and the cooling effect is weakened. At this time, the temperature of the thermosensitive hydrogel 7 in the circulation pipe 5 rises to the phase transition temperature and water cooling is performed. When the water in the circulation pipe 5 is heated to the phase transition temperature of the thermosensitive hydrogel 7, the thermosensitive hydrogel 7 shrinks to a solid state, making the water flow rate in the circulation pipe 5 faster, and then pressing down the pressing plate 8. The transmission device transmits the power of pressing the pressing plate 8 to the baffle 9 through the transmission device, and the baffle 9 is displaced to reduce the obstruction of the cross section of the output pipe 4, so that the outlet of the output pipe 4 starts or increases the output of the cooling fluid.

[0065] In this embodiment, the cryogenic fluid may be disposed in the gas cylinder 2, and the cryogenic fluid may be liquid nitrogen or liquid carbon dioxide. The power device 6 may be a propeller or a pump.

[0066] It should be noted that the thermosensitive hydrogel 7 having a suitable phase transition temperature can be flexibly selected according to the heat dissipation requirements.

[0067] In this embodiment, the thermosensitive hydrogel 7 can be a PNIPAAm-PEG thermosensitive hydrogel 7: its transition temperature (also called lower critical solution temperature, LCST) is usually around 20° C. This means that when the temperature is below 20° C., the hydrogel is in a liquid state, and when the temperature is above 20° C., it turns into a gel state.

[0068] The thermosensitive hydrogel 7 may also be a PLGA-PEG-PLGA thermosensitive hydrogel 7: the phase transition temperature of this hydrogel is usually near body temperature, for example, about 35±2° C. This enables it to respond to physiological conditions in in vivo applications and achieve local controlled drug release.

[0069] The thermosensitive hydrogel 7 can also be polyethylene glycol polylactic acid thermosensitive hydrogel 7: its phase transition temperature can be controlled at 38.5-40° C. This temperature range can better preserve water, and when the temperature is higher than the phase transition temperature, the hydrogel will lose water significantly in a short time.

[0070] The phase transition temperature of the thermosensitive hydrogel 7 is affected by many factors, including the type, concentration, molecular weight, cross-linking degree of the polymer and external conditions (such as pH value, ionic strength, etc.).

[0071] It should be noted that, in order to better reflect the structure of the present application, the drawings only show one modular electrical device 3. Of course, when there are multiple electrical devices 3, the positions of other devices can be adaptively adjusted according to the position of the electrical device 3.

[0072] In this embodiment, the cross section of the circulation pipe 5 can be designed to be rounded, so that the flow rate in the circulation pipe 5 is more uniform. The temperature-sensitive hydrogel 7 can be fixed on the inner wall of the circulation pipe 5.

[0073] In some embodiments of the present invention, the cooling method further comprises:

[0074] Move the output end of the output pipe to output to different locations of the electrical device.

[0075] In this embodiment, the mobile output end can cause the low-temperature gas to be sprayed to different positions of the electrical device, thereby increasing the cooling rate.

[0076] In some embodiments of the present invention, moving the output end of the output pipe to output to different positions of the electrical device includes:

[0077] The output end of the output pipe is laterally moved on the upper part of the electrical device to output to different positions of the electrical device.

[0078] In this embodiment, after the low-temperature gas is sprayed onto the electrical device, due to its low temperature, the low-temperature gas moves downward along the surface of the electrical device to reduce the overall temperature of the entire electrical device.

[0079] In some embodiments of the present invention, the output pipe is connected to a plurality of output ends, and the output ends connected to the plurality of output pipes are laterally arranged at the upper portion of the electrical device.

[0080] In some embodiments of the present invention, the cabinet 1 is provided with a vent hole 10, and the vent hole 10 is covered with a shape memory polymer 11 that is deformed by temperature stimulation, and the shape memory polymer 11 includes an initial shape of a plate, and the shape memory polymer 11 of the initial shape blocks the vent hole 10;

[0081] Cooling methods also include:

[0082] When the temperature inside the cabinet 1 is higher than the preset temperature and the pressure is higher than the outside, the shape memory polymer 11 softens and bends under the impact of airflow to release the gas inside the cabinet 1; wherein the preset temperature is the glass transition temperature of the shape memory polymer 11.

[0083] When the temperature in the cabinet 1 rises and the temperature of the shape memory polymer 11 reaches above the glass transition temperature Tg, the shape memory polymer 11 softens. At this time, due to the high temperature in the cabinet 1, the cryogenic fluid in the gas cylinder 2 is continuously released, and while the temperature is lowered, the air pressure in the cabinet 1 increases. At this time, the gas, under the action of the air pressure, can impact the shape memory polymer 11 through the air vents 10, causing it to deform. The increased air pressure is released at the softened shape memory polymer 11, keeping the air pressure in the cabinet 1 stable, and using the gas in the gas cylinder 2 to discharge smoothly. When the gas in the cabinet 1 continuously outputs the cryogenic fluid, the temperature of the gas in the cabinet 1 continues to decrease. After the temperature drops, the thermosensitive hydrogel 7 in the circulation channel swells, causing the flow rate to slow down, and the baffle 9 is lifted, reducing or stopping the output of the cryogenic fluid from the gas cylinder 2. When the gases inside and outside the cabinet 1 tend to be balanced, the shape memory polymer 11 above the Tg temperature overcomes the small pressure difference under the action of the deformation force and returns to the original shape of the closed air vent 10. As the temperature of the shape memory polymer 11 drops below the Tg temperature, the shape memory polymer 11 hardens and maintains the original shape of the closed air vent 10.

[0084] It is understandable that in order to improve the deformation sensitivity of the shape memory polymer 11, a shape memory polymer 11 with a low Tg temperature may be selected.

[0085] It should be noted that the shape memory polymer 11 with a suitable phase transition temperature can be selected according to the requirements. For example, the shape memory polymer 11 can be any one of polyurethane, polymethyl acrylate, polyester and polyvinyl alcohol.

[0086] In some embodiments of the present invention, an electromagnet 18 is disposed on one side of the vent hole 10 away from the shape memory polymer 11, magnetic particles are distributed inside the shape memory polymer 11, and the electromagnet 18 is connected in series with a thermistor 19 with a positive temperature coefficient;

[0087] Cooling methods also include:

[0088] The temperature sensitive resistor 19 adjusts the current passing through the electromagnet 18 according to the temperature to adjust the magnetic force of the electromagnet 18 on the shape memory polymer 11;

[0089] The magnetic force of the electromagnet 18 on the shape memory polymer 11 is used to control the closing or opening of the vent hole 10 .

[0090] In this embodiment, when the temperature in the cabinet 1 is higher than the glass transition temperature, the shape memory polymer 11 becomes soft, and as the low-temperature gas is continuously released, the pressure in the cabinet 1 becomes higher. At this time, the temperature of the temperature-sensitive resistor 19 is higher, the resistance is larger, the current of the electromagnet 18 is smaller, and the magnetic force generated on the shape memory polymer 11 is smaller. Under the action of pressure, the softened shape memory polymer 11 opens the vent 10, discharges the gas, and balances the pressure. As the temperature in the cabinet 1 continues to decrease, the gas in the cabinet 1 is continuously discharged and depressurized, the resistance of the temperature-sensitive resistor 19 decreases, the current of the electromagnet 18 increases, and the magnetic force generated on the shape memory polymer 11 becomes larger. As the magnetic force increases, the pressure decreases. At the same time, the softened shape memory polymer 11 has a deformation force to restore to the initial shape. Under the joint action of multiple factors, the shape memory polymer 11 quickly returns to the initial shape to close the vent 10. As the temperature of the shape memory polymer 11 further drops below the glass transition temperature, it hardens and maintains a stable state of closing the vent 10.

[0091] In some embodiments of the present invention, the ventilation hole 10 is disposed on the top of the cabinet 1 .

[0092] In this embodiment, the low-temperature gas output from the gas cylinder 2 has a relatively low temperature and will shrink and drop in the cabinet 1, while the original high-temperature gas in the cabinet 1 expands and rises. The rising hot air flow heats the shape memory polymer 11 to soften it and then discharge it from the cabinet 1.

[0093] In some embodiments of the present invention, a spring 17 is connected between the pressure plate 8 and the circulation pipe 5;

[0094] Cooling methods also include:

[0095] The spring 17 is used to lift the pressure plate 8 when the water flow rate in the circulation pipe 5 decreases.

[0096] In this embodiment, when the spring 17 is set to slow down the flow rate of water in the circulation pipe 5, the pressure plate 8 is lifted under the action of the spring 17, and then the baffle 9 is controlled by the transmission device to close the output pipe 4 again.

[0097] In some embodiments of the present invention, the transmission device includes a first transmission shaft 12, a hydraulic pipeline 13 and a second transmission shaft 14, the circulation pipeline 5 includes a through hole with the same diameter as the first transmission shaft 12, the first transmission shaft 12 is penetrated by the circulation pipeline 5, a groove is provided in the through hole, a sealing ring is provided in the groove, the two ends of the first transmission shaft 12 are respectively connected to the pressure plate 8 and the first top plug 15 at one end of the hydraulic pipeline 13, the other end of the hydraulic pipeline 13 is provided with a second top plug 16, the second top plug 16 is connected to the second transmission shaft 14, and the second transmission shaft 14 is connected to the baffle 9;

[0098] Cooling methods also include:

[0099] The hydraulic pressure in the hydraulic pipeline 13 is used to transmit the force exerted on the first transmission shaft 12 and the first top plug 15 to the second transmission shaft 14 and the second top plug 16 .

[0100] In this embodiment, the force of water in the circulation pipe 5 on the pressure plate 8 can be transmitted to the baffle 9 by means of hydraulic transmission. The sealing ring can maintain the sealing of the circulation pipe 5 while the first transmission shaft 12 moves.

[0101] In some embodiments of the present invention, the cross-sectional area of ​​the second top plug 16 is greater than the cross-sectional area of ​​the first top plug 15 .

[0102] In this embodiment, according to Pascal's law, the relatively small force of the water flow on the pressure plate 8 can be amplified by setting a difference in cross-sectional area between the first top plug 15 and the second top plug 16, so that the transmission force on the baffle 9 is doubled.

[0103] In some embodiments of the present invention, a thermosensitive hydrogel 7 with different phase transition temperatures is provided in the circulation pipe 5. Such a configuration can make the water flow rate change more smoothly with the temperature, and make the amount of cryogenic fluid output by the gas cylinder 2 more closely correlated with the temperature of the water in the circulation pipe 5.

[0104] In some embodiments of the present invention, the temperature-sensitive hydrogel 7 is fixedly arranged at different positions of the circulation pipe 5. Such an arrangement can increase the connection between the average temperature of the water in the circulation pipe 5 and the temperature-sensitive hydrogel 7. Since the temperature distribution of the water in the circulation pipe 5 is not uniform, if the temperature-sensitive hydrogel 7 is arranged at a centralized position, the phase change of the temperature-sensitive hydrogel 7 may be delayed or advanced, resulting in a weakened regulation of the output of the cryogenic fluid by the gas cylinder 2.

[0105] It should also be noted that the structures in the present invention that can be movably inserted into the housing can all be passed through shafts and holes of the same size and cooperate with sealing rings to achieve dynamic sealing.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling method for a power cabinet, characterized in that: include: The electrical device of the cabinet of the power cabinet is cooled by using a circulating pipe filled with water; wherein the circulating pipe is provided with a power device to drive the water in the circulating pipe to circulate; The flow rate of water in the circulation pipeline is accelerated by utilizing the thermal contraction of the temperature-sensitive hydrogel preset in the circulation pipeline; The downward pressure of the pressing plate in the circulation pipeline is adjusted by using the flow rate of the water in the circulation pipeline; The pressure of the pressure plate is transmitted to the baffle in the output pipeline for outputting the cryogenic fluid by using the transmission device, so as to adjust the position of the baffle; Adjusting the position of the baffle to adjust the flow rate of the low-temperature fluid output from the output pipeline; A spring is connected between the pressing plate and the circulation pipeline; The cooling method further comprises: When the water flow rate in the circulation pipe decreases, the pressure plate is lifted by the spring; The transmission device includes a first transmission shaft, a hydraulic pipeline and a second transmission shaft. The circulation pipeline includes a through hole with the same diameter as the first transmission shaft. The first transmission shaft is inserted into the circulation pipeline. A groove is provided in the through hole. A sealing ring is provided in the groove. Both ends of the first transmission shaft are respectively connected to a pressure plate and a first top plug at one end of the hydraulic pipeline. A second top plug is provided at the other end of the hydraulic pipeline. The second top plug is connected to the second transmission shaft. The second transmission shaft is connected to the baffle. Cooling methods also include: The hydraulic pressure in the hydraulic pipeline is used to transmit the force exerted on the first transmission shaft and the first ejector plug to the second transmission shaft and the second ejector plug.

2. The cooling method according to claim 1, characterized in that: Also includes: The output end of the output pipe is moved to output to different positions of the electrical device.

3. The cooling method according to claim 2, characterized in that: The step of moving the output end of the output pipe to output to different positions of the electrical device comprises: The output end of the output pipe is laterally moved above the electrical device to output to different positions of the electrical device.

4. The cooling method according to claim 1, characterized in that: The output pipe is connected to a plurality of output ends, and the output ends connected to the plurality of output pipes are transversely arranged on the upper part of the electrical device.

5. The cooling method according to claim 1, characterized in that: The cabinet is provided with an air vent, and the air vent is covered with a shape memory polymer that is deformed by temperature stimulation, and the shape memory polymer includes an initial shape of a plate, and the shape memory polymer in the initial shape blocks the air vent; The cooling method further comprises: When the temperature inside the cabinet is higher than a preset temperature and the pressure is higher than outside, the shape memory polymer softens and bends under the impact of airflow to release the gas inside the cabinet; wherein the preset temperature is the glass transition temperature of the shape memory polymer.

6. The cooling method according to claim 5, characterized in that: An electromagnet is arranged on one side of the vent hole away from the shape memory polymer, magnetic particles are distributed inside the shape memory polymer, and the electromagnet is connected in series with a thermistor with a positive temperature coefficient; The cooling method further comprises: The temperature-sensitive resistor adjusts the current passing through the electromagnet according to the temperature to adjust the magnetic force of the electromagnet on the shape memory polymer; The magnetic force of the electromagnet on the shape memory polymer is used to control the shape memory polymer to close or open the vent hole.

7. The cooling method according to claim 5 or 6, characterized in that: The air vent is arranged on the top of the cabinet.

8. The cooling method according to claim 1, characterized in that: The thermosensitive hydrogels with different phase transition temperatures are arranged in the circulation pipeline.

9. The cooling method according to claim 1, characterized in that: The temperature-sensitive hydrogel is fixedly arranged at different positions of the circulation pipeline.

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