Field first-aid kit

Abstract

This invention belongs to the field of first aid equipment, specifically a field first aid kit, comprising a box body and a detachable lid. The box body is internally divided into multiple storage chambers by vertical partitions. The inner wall of the lid is provided with a flexible airbag, which is connected to an inflation / deflation mechanism. The airbag includes an airbag body and multiple positioning protrusions. The top of each positioning protrusion communicates with the airbag body, and the lower end of each positioning protrusion extends into and seals the storage chamber. A phase change material layer is provided inside the box body. As altitude increases and temperature and air pressure decrease, because the positioning protrusions fill the space of the storage chambers, only a small amount of air remains in the storage chambers outside the positioning protrusions, preventing the medication from swelling or leaking. Furthermore, air can be added to the airbag through the inflation / deflation mechanism to increase the air pressure in the airbag, ensuring that the air inside the positioning protrusions always has a high pressure, which can stably compress the medication and prevent the medication from swelling.

Description

Technical Field

[0001] This invention belongs to the field of first aid equipment, and in particular a first aid kit for field use. Background Technology

[0002] With the rise in popularity of outdoor activities such as hiking and mountaineering, injuries and altitude sickness among participants are frequent occurrences. To handle these emergencies, first-aid kits are typically necessary. Traditional first-aid kits have standard plastic casings and contain commonly used first-aid supplies such as bandages and anti-inflammatory and hemostatic drugs, meeting the needs of most outdoor areas. However, in high-altitude regions, low temperatures can cause some medications to crystallize, decompose, or become ineffective, especially biological agents, insulin, some antibiotics, and liquid medications. Furthermore, as altitude increases, air pressure gradually decreases, causing bagged medications to swell and bottled medications to evaporate. Simply using insulating material for the first-aid kit casing is insufficient for long-term heat preservation. Adding an electric heating element increases the cost of the kit, and the heavy electrical components are difficult to charge in the field, making them inconvenient for extended carrying.

[0003] Furthermore, to facilitate the retrieval and placement of medications, they are typically simply placed inside the storage cavity. During hiking and mountaineering, the medications are prone to shifting, potentially leading to packaging damage or leakage. Currently, some first-aid kits incorporate airbags. For example, invention patent application number CN201910814421.0 discloses a first-aid kit with airbags inside that align with the storage cylinder. These airbags provide cushioning and shock absorption, but they do not solve the problem of medication bloating due to low air pressure in high-altitude and frigid regions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a first aid kit for outdoor use, which is suitable for hiking, mountaineering and other activities in high-altitude and cold regions. It can maintain the temperature and air pressure inside the first aid kit and prevent problems such as swelling, freezing, decomposition and volatilization of medicines caused by low temperature and low pressure. At the same time, it avoids the first aid kit structure being too complicated.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a field first aid kit, including a box body and a detachable box lid, wherein the interior of the box body is divided into multiple storage compartments by vertical partitions. The inner wall of the box lid is provided with a flexible airbag, which is connected to an inflation and deflation mechanism; the airbag includes an airbag body and multiple positioning protrusions, the top of the positioning protrusions is connected to the airbag body, and the lower end of each positioning protrusion extends into the storage cavity and closes the storage cavity. The box contains a phase change material layer.

[0006] Furthermore, the enclosure includes an outer heat-insulating enclosure and an inner heat-conducting enclosure, with the phase change material layer disposed inside the side wall of the inner heat-conducting enclosure; the enclosure cover is detachably connected to the outer heat-insulating enclosure, and the storage cavity is located inside the inner heat-conducting enclosure; A shock-absorbing mechanism is provided between the outer heat insulation box and the inner heat conduction box.

[0007] Furthermore, the shock absorption mechanism includes a heat-conducting plate, and the heat-conducting plate has multiple sealed cavities inside. Each sealed cavity contains a magnetic fluid, and a permanent magnet is suspended inside the magnetic fluid.

[0008] Furthermore, the magnetic fluid comprises the following components in the following volume percentages: Liquid crystal base liquid system: 45%-50%, including 4-pentyl-4'-cyanobiphenyl and 4-heptyl-4'-cyanobiphenyl, wherein the mass ratio of 4-pentyl-4'-cyanobiphenyl to 4-heptyl-4'-cyanobiphenyl is 8:2; Functional additive system: 25%-30%, including ionic liquid and thermosensitive polymer, wherein the lower critical dissolution temperature of the thermosensitive polymer is 14-16℃; Magnetic particle system: 20%-25%, including Fe3O4@γ-Fe2O3 core-shell structured particles with surface grafted liquid crystal polymer brushes and thermosensitive polymers; Thermal conductivity enhancer: 2%-5%, including hexagonal boron nitride nanosheets.

[0009] Furthermore, the liquid crystal base liquid system also contains dimethyl silicone oil, which accounts for 10%-20% of the volume of the base liquid system.

[0010] Furthermore, the ionic liquid is 1-butyl-3-methylimidazolium hexafluorophosphate; the thermosensitive polymer is poly(N-isopropylacrylamide-co-acrylic acid), wherein the molar percentage of acrylic acid is 3%-7%.

[0011] Furthermore, the top of the heat-conducting plate is rotatably connected to the inner wall of the outer heat-insulating box via a pin. A first heat-conducting connector is provided on the side of the heat-conducting plate facing the inner heat-conducting box, and the first heat-conducting connector is hinged to the heat-conducting plate. A second heat-conducting connector is hinged to the outer wall of the inner heat-conducting box. The second heat-conducting connector is higher than the first heat-conducting connector. A heat pipe is provided between the first heat-conducting connector and the second heat-conducting connector. The evaporation end of the heat pipe is inserted into the first heat-conducting connector, and the cooling end of the heat pipe is inserted into the second heat-conducting connector.

[0012] Furthermore, the phase change material layer is n-pentadecane.

[0013] Furthermore, the inflation / deflation mechanism includes an inlet check valve and a deflation check valve, both of which penetrate the housing cover.

[0014] Furthermore, the lid is fastened to the top of the box body, the lid and the box body are connected by a connector, and a sealing gasket is provided between the lid and the box body.

[0015] The beneficial effects of this invention are as follows: By setting multiple positioning protrusions integrated with the airbag at the bottom of the airbag, these protrusions extend into each storage cavity. This not only provides the shock absorption effect of a traditional airbag but also fills the excess space in the storage cavity. Inflating the airbag causes the positioning protrusions to expand, which in turn compresses the bagged or bottled medicines in the storage cavity, preventing movement and improving stability. As altitude increases and temperature and air pressure decrease, because the positioning protrusions fill the storage cavity, only a small amount of air remains in the storage cavity outside the protrusions, preventing the medicine from swelling or leaking. Furthermore, air can be added to the airbag through the inflation / deflation mechanism, increasing the air pressure and ensuring that the air inside the positioning protrusions always maintains a high pressure, stably compressing the medicine and preventing swelling. The expansion of the positioning protrusions seals the storage cavity, providing better protection for the medicine and preventing external moisture from entering.

[0016] The first aid kit of the present invention has a relatively simple structure, does not require the installation of electrical components such as batteries and heating elements, and has low cost. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main sectional view of the present invention; Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle; Reference numerals: 1—Box body; 2—Box cover; 3—Baffle; 4—Storage cavity; 5—Airbag body; 6—Positioning protrusion; 7—Phase change material layer; 8—Outer heat-insulating box body; 9—Inner heat-conducting box body; 10—Heat-conducting plate; 11—Inlet one-way valve; 12—Outlet one-way valve; 13—Sealing gasket; 14—Pin shaft; 15—First heat-conducting connector; 16—Second heat-conducting connector; 17—Heat pipe; 18—Permanent magnet block. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] This invention provides a field first-aid kit suitable for outdoor activities in high-altitude and cold regions, such as hiking and mountaineering. Specifically, as follows... Figure 1 and Figure 2As shown, the device includes a box body 1 and a removable lid 2. The interior of the box body 1 is divided into multiple storage compartments 4 by vertical partitions 3. The box body 1 is rectangular, and the lid 2 is located on top of the box body 1. The lid 2 can be opened and closed for easy access to medicines or medical supplies. The storage compartments 4 include multiple medicine storage compartments and medical supply storage compartments. Each medicine storage compartment is used to store one type of medicine, and each medical supply storage compartment is used to store gauze and other supplies.

[0020] The inner wall of the box cover 2 is provided with a flexible airbag, which is connected to an inflation and deflation mechanism. The airbag includes an airbag body 5 and multiple positioning protrusions 6. The top of the positioning protrusions 6 is connected to the airbag body 5, and the lower end of each positioning protrusion 6 extends into the storage cavity 4 and closes the storage cavity 4.

[0021] The positioning protrusion 6 is integrally formed with the airbag body 5. Each storage cavity 4 corresponds to one positioning protrusion 6, and the shape and size of the positioning protrusion 6 are adapted to the storage cavity 4. The airbag body 5 is fixed on the box cover 2. When the box cover 2 is removed, the airbag body 5 and the positioning protrusion 6 move synchronously outside the box 1 along with the box cover 2. The inflation and deflation mechanism is used to inflate and deflate the airbag body 5, so that the airbag body 5 and the positioning protrusion 6 have appropriate air pressure.

[0022] The chamber 1 is equipped with a phase change material layer 7, which can store a certain amount of heat to regulate the temperature inside the chamber 1 and reduce the impact of low external temperature on the medicine.

[0023] When using the field first aid kit of this invention, medicines and medical supplies are placed into the storage cavity 4 as needed, and then the lid 2 is closed. Inflation is then performed on the airbag body 5 via the inflation / deflation mechanism. The airbag body 5 and the positioning protrusion 6 gradually expand. The positioning protrusion 6 extends into the storage cavity 4 and compresses the medicines or medical supplies within, ensuring stability and preventing movement. Because the positioning protrusion 6 fills the cavity inside the storage cavity 4 and compresses the medicines, it effectively prevents the medicines from swelling or leaking due to changes in external temperature and air pressure. Furthermore, gas can be replenished into the airbag body 5 according to changes in external air pressure, maintaining stable air pressure within the airbag body 5 and the positioning protrusion 6.

[0024] In this invention, the housing 1 includes an outer heat-insulating housing 8 and an inner heat-conducting housing 9. A phase change material layer 7 is disposed inside the side wall of the inner heat-conducting housing 9. The housing cover 2 is detachably connected to the outer heat-insulating housing 8, and the storage cavity 4 is located inside the inner heat-conducting housing 9. The outer heat-insulating housing 8 uses lightweight heat-insulating materials, such as carbon fiber reinforced composite materials and ABS engineering plastics, to slow down heat exchange between the inside and outside of the housing 1 and reduce the impact of low external temperatures. The inner heat-conducting housing 9 can be made of aluminum alloy. The bottom plate of the inner heat-conducting housing 9 can be fixedly connected to the bottom plate of the outer heat-insulating housing 8.

[0025] A shock-absorbing mechanism is provided between the outer heat-insulating box 8 and the inner heat-conducting box 9. The shock-absorbing mechanism is used to reduce vibration and weaken the adverse effects of the vibration of the outer heat-insulating box 8 on the internal medicine.

[0026] The shock absorption mechanism can employ conventional structures such as springs and elastic pads. In a preferred embodiment, the shock absorption mechanism includes a heat-conducting plate 10, which can be made of aluminum alloy. Multiple sealed cavities are provided inside the heat-conducting plate 10, each containing a magnetic fluid. A permanent magnet 18 is suspended within the magnetic fluid. There can be four, six, or other sealed cavities. The permanent magnet 18 can be connected to the wall of the sealed cavity via a connecting rod, allowing it to suspend in the magnetic fluid, which surrounds the permanent magnet 18.

[0027] The permanent magnet 18 can generate a magnetic field, causing the magnetic nanoparticles in the magnetofluid to rapidly align into chain-like and columnar microstructures along the magnetic field direction. These chain-like and columnar microstructures significantly increase the effective viscosity of the magnetofluid, transforming it from a readily flowing liquid into a low-flowing liquid with high viscosity and strong shear resistance. During hiking or mountain climbing with a first-aid kit, the kit inevitably experiences vibration. When the kit vibrates, the permanent magnet moves within the magnetofluid due to inertia, causing the fluid to be sheared. The chain-like and columnar microstructures are continuously stretched, broken, and reorganized, generating strong viscous resistance. This resistance absorbs vibration energy, preventing the vibration from being transmitted to the medicine in the storage cavity 4, thus providing a shock-absorbing effect. Furthermore, when the magnetofluid is sheared, the particle chains are continuously broken and reorganized. All the intermolecular friction, interparticle friction, and liquid crystal molecule friction are converted into heat energy, which is then transferred to the inner heat-conducting box 9 to maintain the temperature within it. Therefore, the heat-conducting plate 10 of this invention not only provides shock absorption but also converts vibration into heat energy, which helps maintain the temperature of the medicine and prevents it from freezing.

[0028] This invention uses both the heat-conducting plate 10 and the phase change material layer 7 to regulate the temperature, which helps to keep the internal temperature of the first aid kit within a suitable range for a long time and meet the heat preservation requirements of the medicine.

[0029] Various types of magnetic fluids exist, but they generally suffer from the following problems: insufficient heat generation efficiency at low temperatures, failing to quickly meet the antifreeze requirements of pharmaceuticals; and uncontrollable heat generation at high temperatures, easily leading to overheating of the storage chamber; their rheological properties lack temperature-sensitive adaptability, with zero-field viscosity and magnetoviscosity changes failing to match the temperature range requirements for pharmaceutical storage; they have poor environmental adaptability, easily exhibiting particle aggregation and sedimentation in high-altitude, low-pressure, and extremely low-temperature environments, resulting in rapid performance degradation; and their thermal conductivity is insufficient, preventing the rapid and uniform transfer of heat generated to the pharmaceutical storage chamber, thus limiting their heat preservation effect. Generally, most conventional drugs are suitable for storage at temperatures between 5-25°C, and existing magnetic fluids struggle to control the temperature within this suitable range.

[0030] To address the aforementioned issues, this invention employs a novel magnetic fluid capable of intelligently adjusting vibration-thermal energy conversion efficiency within a temperature range of 5-25°C to better meet the preservation requirements of pharmaceuticals. Specifically, it comprises the following components by volume percentage: The liquid crystal base solution system comprises 45%-50% of 4-pentyl-4'-cyanobiphenyl (5CB) and 4-heptyl-4'-cyanobiphenyl (7CB), with a mass ratio of 8:2. Additionally, the liquid crystal base solution system also contains dimethyl silicone oil, which accounts for 10%-20% of the volume of the base solution system.

[0031] The liquid crystal base liquid system serves as the continuous phase of the magnetic fluid, used to adjust its rheological properties and temperature response characteristics. Specifically, 5CB acts as the main liquid crystal, providing excellent ordered alignment characteristics; 7CB is used to adjust the phase transition temperature of the liquid crystal mixture; when mixed with 5CB at an 8:2 mass ratio, the ordered parameters show an inflection point in the 15-20℃ range, matching the temperature range for drug storage; dimethyl silicone oil is used to improve the fluidity of the liquid crystal base liquid, reducing viscosity at low temperatures and ensuring good fluidity of the magnetic fluid even at low temperatures.

[0032] Functional additive system: 25%-30%, including ionic liquid and thermosensitive polymer, the lower critical dissolution temperature of the thermosensitive polymer is 14-16℃. Specifically, the ionic liquid is 1-butyl-3-methylimidazolium hexafluorophosphate, and the thermosensitive polymer is poly(N-isopropylacrylamide-co-acrylic acid), wherein the molar percentage of acrylic acid is 3%-7%.

[0033] Functional additive systems are used to enhance the temperature-sensitive response, suspension stability, and thermal conductivity of magnetic fluids. Ionic liquids have excellent electrical conductivity, thermal conductivity, and chemical stability, which can improve the thermal conductivity and low-temperature fluidity of magnetic fluids. The low critical solution temperature (LCST) of the temperature-sensitive polymer is adjusted to 15°C by copolymerizing N-isopropylacrylamide with acrylic acid. When the temperature is below 15°C, it dissolves and the polymer brushes expand; when the temperature is above 15°C, it precipitates and the polymer brushes curl up. By changing the steric hindrance between particles through conformational transformation, the rheological properties and heat generation efficiency can be controlled.

[0034] Magnetic particle system: 20%-25%, including Fe3O4@γ-Fe2O3 core-shell structured particles with surface grafted liquid crystal polymer brushes and thermosensitive polymers. The average particle size of the Fe3O4@γ-Fe2O3 core-shell structured particles is 10-14 nm, and the magnetic saturation intensity is 80-90 emu / g; the grafting density of the liquid crystal polymer brush is 0.2-0.4 chains / nm², and the brush length is 7-9 nm.

[0035] The magnetic particle system serves as the dispersed phase of the magnetofluid, providing the core for magnetic and shear-heat generation. The Fe3O4@γ-Fe2O3 core-shell structured particles possess both excellent magnetic properties and chemical stability. The silane coupling agent KH-550 is used for surface pretreatment of the magnetic particles, introducing double bonds to provide active sites for subsequent polymer grafting, while also enhancing the binding force between the particles and the base fluid and preventing particle agglomeration.

[0036] Thermal conductivity enhancer: 2%-5%, including hexagonal boron nitride nanosheets, used to improve the thermal conductivity efficiency of magnetic fluids and achieve rapid and uniform heat transfer.

[0037] The magnetic fluid of the present invention has the following functions: The order parameter S(T) of liquid crystal molecules changes with temperature. At 5℃, S≈0.65 (highly ordered), at 15℃, S≈0.60 (order begins to decrease), and at 25℃, S≈0.45 (order significantly reduced). When liquid crystal molecules are arranged in an ordered manner, they provide an orientation template for magnetic particles. The liquid crystal polymer brush grafted on the particle surface works synergistically with the base liquid crystal molecules to form a liquid crystal-polymer composite ordered structure at low temperatures, which enhances the interaction between particles and improves the magnetoviscous effect and shear heat generation efficiency. At high temperatures, the order of liquid crystal decreases, the composite ordered structure disintegrates, the interaction between particles weakens, and the heat generation efficiency decreases.

[0038] Triple temperature-sensitive synergistic response: Changes in the orderliness of the liquid crystal substrate: Increased temperature leads to decreased liquid crystal order parameters, increased difficulty in particle alignment, decreased strength of chain structures, weakened magnetoviscous effect, and decreased heat generation efficiency. When the temperature is below 15℃, PNIPAM-co-AAc dissolves, the polymer brush expands, increasing the steric hindrance between particles and improving the particle dispersion stability, while also enhancing the magnetoviscous effect; when the temperature is above 15℃, the polymer precipitates, the brush part curls up, the steric hindrance decreases, and the magnetoviscous effect weakens. Surface charge density adjustment: the degree of ionization of carboxyl groups in temperature-sensitive polymers changes with temperature. At low temperatures, the degree of ionization is high, the surface charge density is large, the electrostatic repulsion between particles is strong, and the dispersion stability is good. At high temperatures, the degree of ionization is low, the surface charge density is small, the electrostatic repulsion is weakened, and the interaction between particles is further adjusted.

[0039] The triple temperature-sensitive response works synergistically to achieve precise temperature control of magnetohydrodynamic properties and heat generation efficiency.

[0040] The preparation process of the magnetic fluid of the present invention includes: Preparation of Fe3O4@γ-Fe2O3 core-shell structured particles; Liquid crystal polymer brushes were grafted onto the particle surface using atom transfer radical polymerization. Thermosensitive polymers were grafted onto the surface of particles using surface-initiated polymerization. Preparation of liquid crystal base liquid system; The modified magnetic particles were dispersed in the base liquid system, and functional additives and thermal conductivity enhancers were added. Homogenization and magnetic field-induced self-assembly are performed.

[0041] A specific preparation process is as follows: 1. Preparation and modification of magnetic particles Weigh 5.4 g of FeCl3·6H2O, 1.0 g of sodium citrate, and 3.6 g of sodium acetate, and dissolve them in 40 mL of ethylene glycol, stirring until completely dissolved. Transfer the solution to a 100 mL high-pressure reactor lined with polytetrafluoroethylene and react at 200 °C for 10 hours. After natural cooling, wash three times alternately with ethanol and deionized water, and dry under vacuum at 60 °C to obtain Fe3O4 nanoparticles.

[0042] The Fe3O4 particles were dispersed in deionized water, and an appropriate amount of hydrogen peroxide was added. The mixture was stirred and oxidized at 80°C for 2 hours to obtain Fe3O4@γ-Fe2O3 core-shell structured particles.

[0043] 1 g of core-shell particles were dispersed in 50 mL of anhydrous toluene, and 0.05 g of silane coupling agent KH-550 was added. The mixture was refluxed for 6 hours under nitrogen protection. After washing and drying, magnetic particles with double bonds on their surface were obtained.

[0044] Take 0.5 g of the above magnetic particles, add 1 g of oxyethyl methacrylate, 0.01 g of copper bromide (CuBr), and 0.02 g of pentamethyldiethylenetriamine (PMDETA), dissolve in 20 mL of toluene, and react at 70 °C for 24 hours. After washing, magnetic particles with surface-grafted liquid crystal polymer brushes are obtained, with a brush length of approximately 8 nm and a grafting density of approximately 0.3 chains / nm².

[0045] Take 0.5 g of the above magnetic particles, add 0.95 g of N-isopropylacrylamide, 0.05 g of acrylic acid, and 0.01 g of azobisisobutyronitrile (AIBN), dissolve in 20 mL of tetrahydrofuran, and react at 65 °C for 12 hours. Wash and dry to obtain double-grafted magnetic particles.

[0046] 2. Preparation of liquid crystal base liquid system Weigh 8g of 4-pentyl-4'-cyanobiphenyl and 2g of 4-heptyl-4'-cyanobiphenyl, melt and mix them in a water bath at 60℃, and then sonicate them for 30 minutes. Add 3g of dimethyl silicone oil and 4g of ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate, and stir magnetically at 60℃ for 2 hours.

[0047] Take another 1g of PNIPAM-co-AAc (a microgel copolymerized from N-isopropylacrylamide and acrylic acid, wherein the molar percentage of acrylic acid is 5%), dissolve it in 10mL of tetrahydrofuran, slowly add it dropwise to the above base solution, and remove the tetrahydrofuran by rotary evaporation.

[0048] 3. Magnetofluid preparation Take 2g of the modified magnetic particles and disperse them in 8g of the above liquid crystal base solution. Disperse the particles for 30 minutes using a high-shear emulsifier (10000rpm). Then add 0.15g of oleic acid, 0.05g of BHT (antioxidant 264), 0.05g of polymethacrylate, and 0.3g of hexagonal boron nitride nanosheets in sequence, and sonicate for 10 minutes after each addition.

[0049] The mixture was subjected to planetary ball milling (200 rpm, 4 hours), followed by ultrasonic cell disruption (500 W, 20 kHz, 1 hour). Finally, it was placed in a 0.5 T rotating magnetic field (10 rpm, 2 hours) and degassed under vacuum for 30 minutes.

[0050] The magnetorheological fluid prepared in this invention was subjected to rheological performance testing using an Anton Paar MCR302 rheometer, and the results are as follows: Zero-field viscosity: 5.1 Pa·s at 5℃, 2.0 Pa·s at 15℃, and 0.9 Pa·s at 25℃; Viscosity under a 0.5T magnetic field: 5100 Pa·s at 5℃, 600 Pa·s at 15℃, and 135 Pa·s at 25℃; Magnetoviscosity change factor: 1000 times at 5℃, 300 times at 15℃, and 150 times at 25℃.

[0051] The magnetic fluid was placed in a temperature-controlled device and heated from 5°C to 25°C at a rate of 1°C / min, and the viscosity change was monitored. The results showed a clear inflection point near 15°C, where the viscosity change rate increased significantly.

[0052] Construct a simulated vibration platform with a frequency of 5Hz and an amplitude of ±5mm: At 5℃: Input power 0.5W, heat generation power 0.43W, efficiency 86%; At 15℃: Input power 0.5W, heat generation power 0.25W, efficiency 50%; At 25℃: Input power 0.5W, heat generation power 0.10W, efficiency 20%; It is evident that the heat production power decreases significantly when the temperature rises to 15℃, and further decreases when the temperature reaches 25℃.

[0053] In summary, the magnetic fluid of this invention exhibits high viscosity and strong magnetic response characteristics in the low-temperature range of 5-15℃, enabling it to efficiently convert vibration into heat energy. In the high-temperature range of 15-25℃, it automatically switches to low viscosity and weak magnetic response characteristics, slowing down the heat generation rate and preventing overheating. Through the synergistic effect of the liquid crystal mixture ratio and the temperature-sensitive polymer design, a significant performance transformation is achieved near 15℃, perfectly matching the optimal temperature range for drug storage. The vibration-to-heat energy conversion efficiency can reach over 85% at 5℃, while automatically decreasing to around 20% at 25℃, achieving intelligent energy efficiency allocation.

[0054] One side of the heat-conducting plate 10 can be fixedly connected to the inner wall of the outer heat insulation box 8, and the other side is attached to the outer wall of the inner heat-conducting box 9, so that the heat generated by the magnetic fluid inside the heat-conducting plate 10 can be transferred to the inner heat-conducting box 9. However, when the heat-conducting plate 10 vibrates with the outer heat insulation box 8, the heat-conducting plate 10 will move relative to the outer wall of the inner heat-conducting box 9, and friction will occur between the two, which is prone to wear.

[0055] To ensure rapid heat transfer from the heat-conducting plate 10 to the inner heat-conducting housing 9, while avoiding direct contact between the inner heat-conducting housing 9 and the heat-conducting plate 10 that could lead to wear on the contact surface, the present invention rotatably connects the top of the heat-conducting plate 10 to the inner wall of the outer heat-insulating housing 8 via a pin 14. Specifically, the pin 14 can be fixedly connected to the outer heat-insulating housing 8, and the middle part of the top of the heat-conducting plate 10 is sleeved on the pin 14 and can rotate on the pin 14. The pin 14 restricts the vertical movement of the heat-conducting plate 10, the axial forward and backward movement along the pin 14, and the radial and horizontal left and right movement along the pin 14, but does not restrict the rotational movement of the heat-conducting plate 10. When the heat-conducting plate 10 is subjected to left and right vibrations, it can swing around the pin 14 as a whole. This installation method can increase the vibration amplitude of the heat-conducting plate 10, thereby improving the heat generation efficiency of the internal magnetic fluid.

[0056] A first heat-conducting connector 15 is provided on the side of the heat-conducting plate 10 facing the inner heat-conducting housing 9, and the first heat-conducting connector 15 is hinged to the heat-conducting plate 10. A second heat-conducting connector 16 is hinged to the outer wall of the inner heat-conducting housing 9, and the second heat-conducting connector 16 is higher than the first heat-conducting connector 15. A heat pipe 17 is provided between the first heat-conducting connector 15 and the second heat-conducting connector 16. The evaporation end of the heat pipe 17 is inserted into the first heat-conducting connector 15. Specifically, the first heat-conducting connector 15 is provided with an insertion hole, and the first heat-conducting connector 15 is inserted into the insertion hole and slides in fit with the insertion hole. The cooling end of the heat pipe 17 is inserted into the second heat-conducting connector 16. The center lines of the first heat-conducting connector 15, the second heat-conducting connector 16, and the pin 14 are in the same vertical plane.

[0057] The heat pipe 17 is a traditional heat-conducting element with a capillary layer on its inner wall, an internal vacuum, and a working fluid. One end of the heat pipe 17 is the evaporation end, and the other end is the cooling end. During operation, the evaporation end absorbs heat, and the working fluid inside the evaporation end liquefies into a gaseous state and flows to the cooling end. The gaseous working fluid liquefies upon cooling at the cooling end and releases heat, completing the heat transfer. The liquid working fluid at the cooling end returns to the evaporation end under the capillary action of the capillary layer, realizing the circulation of the working fluid. In this invention, the heat-conducting plate 10 transfers heat to the first heat-conducting connector 15, and the heat pipe 17 transfers the heat from the first heat-conducting connector 15 to the second heat-conducting connector 16, and then from the second heat-conducting connector 16 to the inner heat-conducting housing 9. Because the heat-conducting plate 10 continuously oscillates, the first heat-conducting connector 15 is hinged to the heat-conducting plate 10, and the second heat-conducting connector 16 is hinged to the inner heat-conducting housing 9, so that the heat pipe 17 can stably transfer heat even during the oscillation of the heat-conducting plate 10.

[0058] Traditional heat pipe 17 uses capillary action in the capillary layer for recirculation, and its efficiency is limited by the recirculation rate of the liquid working fluid. In this invention, the lower end of heat pipe 17 swings with the heat-conducting plate 10, while the upper end remains in the same position. During the swinging process of heat pipe 17, the liquid working fluid inside is subjected to centrifugal force towards the evaporation end. Under the action of centrifugal force, the liquid working fluid at the cooling end can return to the evaporation end more quickly, thereby improving the recirculation rate of the working fluid and improving the heat transfer efficiency of heat pipe 17.

[0059] In this invention, the phase change material layer 7 is n-pentadecane, and the phase change temperature of n-pentadecane is about 10°C. When the temperature of the heat-conducting plate 10 is higher than 10°C, the phase change material layer 7 absorbs heat and gradually converts into a liquid state. When the temperature of the heat-conducting plate 10 is lower than 10°C, the phase change material layer 7 releases heat and gradually converts into a solid state.

[0060] In this invention, the inflation / deflation mechanism includes an inlet one-way valve 11 and a deflation one-way valve 12, both of which penetrate the cover 2. The inlet one-way valve 11 and the deflation one-way valve 12 are mounted on the cover 2, allowing for inflation via the inlet one-way valve 11 or deflation via the deflation one-way valve 12 from the outside, making operation convenient. In activities such as hiking and mountaineering, inflatable items such as air mattresses, cushions, pillows, and tents are often carried; therefore, a manual or electric air pump is typically used to inflate the inlet one-way valve 11.

[0061] To facilitate a stable connection between the lid 2 and the body 1, the lid 2 is fastened to the top of the body 1. The lid 2 and the body 1 are connected by a connector, which can be an existing lock or other component. A sealing gasket 13 is provided between the lid 2 and the body 1. The sealing gasket 13 enhances the sealing at the connection between the lid 2 and the body 1, preventing external water from entering the first aid kit.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A field first aid kit, comprising a box body (1) and a removable box lid (2), wherein the interior of the box body (1) is divided into multiple storage chambers (4) by vertical partitions (3), characterized in that: The inner wall of the box cover (2) is provided with a flexible airbag, and the airbag is connected to an inflation and deflation mechanism; the airbag includes an airbag body (5) and multiple positioning protrusions (6), the top of the positioning protrusions (6) is connected to the airbag body (5), and the lower end of each positioning protrusion (6) extends into the storage cavity (4) and closes the storage cavity (4). A phase change material layer (7) is provided inside the box (1).

2. The field first aid kit as described in claim 1, characterized in that: The enclosure (1) includes an outer heat-insulating enclosure (8) and an inner heat-conducting enclosure (9), and the phase change material layer (7) is disposed inside the side wall of the inner heat-conducting enclosure (9); the enclosure cover (2) is detachably connected to the outer heat-insulating enclosure (8), and the storage cavity (4) is located inside the inner heat-conducting enclosure (9); A shock-absorbing mechanism is provided between the outer heat insulation box (8) and the inner heat conduction box (9).

3. The field first aid kit as described in claim 2, characterized in that: The shock absorption mechanism includes a heat-conducting plate (10), and the heat-conducting plate (10) has multiple sealed cavities inside. Each sealed cavity contains a magnetic fluid, and a permanent magnet block (18) is suspended inside the magnetic fluid.

4. The field first aid kit as described in claim 3, characterized in that: The magnetic fluid comprises the following components by volume percentage: Liquid crystal base liquid system: 45%-50%, including 4-pentyl-4'-cyanobiphenyl and 4-heptyl-4'-cyanobiphenyl, wherein the mass ratio of 4-pentyl-4'-cyanobiphenyl to 4-heptyl-4'-cyanobiphenyl is 8:2; Functional additive system: 25%-30%, including ionic liquid and thermosensitive polymer, wherein the lower critical dissolution temperature of the thermosensitive polymer is 14-16℃; Magnetic particle system: 20%-25%, including Fe3O4@γ-Fe2O3 core-shell structured particles with surface grafted liquid crystal polymer brushes and thermosensitive polymers; Thermal conductivity enhancer: 2%-5%, including hexagonal boron nitride nanosheets.

5. The field first aid kit as described in claim 4, characterized in that: The liquid crystal base liquid system also contains dimethyl silicone oil, which accounts for 10%-20% of the volume of the base liquid system.

6. The field first aid kit as described in claim 4, characterized in that: The ionic liquid is 1-butyl-3-methylimidazolium hexafluorophosphate; the thermosensitive polymer is poly(N-isopropylacrylamide-co-acrylic acid), wherein the molar percentage of acrylic acid is 3%-7%.

7. The field first aid kit as described in claim 3, 4, 5 or 6, characterized in that: The top of the heat-conducting plate (10) is rotatably connected to the inner wall of the outer heat-insulating box (8) via a pin (14). A first heat-conducting connector (15) is provided on the side of the heat-conducting plate (10) facing the inner heat-conducting box (9), and the first heat-conducting connector (15) is hinged to the heat-conducting plate (10). A second heat-conducting connector (16) is hinged to the outer wall of the inner heat-conducting box (9). The second heat-conducting connector (16) is higher than the first heat-conducting connector (15). A heat pipe (17) is provided between the first heat-conducting connector (15) and the second heat-conducting connector (16). The evaporation end of the heat pipe (17) is inserted into the first heat-conducting connector (15), and the cooling end of the heat pipe (17) is inserted into the second heat-conducting connector (16).

8. The field first aid kit as described in claim 3, 4, 5 or 6, characterized in that: The phase change material layer (7) is n-pentadecane.

9. The field first aid kit as described in claim 1, characterized in that: The inflation / deflation mechanism includes an inlet check valve (11) and a deflation check valve (12), both of which penetrate the cover (2).

10. The field first aid kit as described in claim 1, characterized in that: The lid (2) is fastened to the top of the box body (1). The lid (2) and the box body (1) are connected by a connector, and a sealing gasket (13) is provided between the lid (2) and the box body (1).

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