Dry ice slow-release device based on bimetallic strip and application

Abstract

The dry ice slow-release device comprises a box body and a box cover, and is characterized in that a storage box is arranged in the box body, dry ice boxes used for being filled with dry ice are arranged at the upper end and the lower end in the storage box respectively, and a storage cavity used for containing aquatic products is formed between the two dry ice boxes; the same side of the two dry ice boxes is communicated with a cold air circulating pipeline, a first pressure release control valve is arranged at the bottom of the cold air circulating pipeline, and a second pressure release control valve is arranged on the box cover; the other sides of the two dry ice boxes communicate with a cold air conveying pipeline, the middle of the cold air conveying pipeline communicates with a cold air release pipeline, and the cold air release pipeline extends into the storage cavity and extends to the other side of the storage cavity. Bimetallic strip temperature control valves used for controlling the cold air conveying pipeline to be opened and closed are arranged on the cold air conveying pipeline and located on the two sides of the cold air releasing pipeline respectively. The automatic temperature adjusting device has the advantages of being energy-saving, efficient, safe, stable, simple in structure and capable of achieving automatic temperature adjusting.

Description

Technical Field

[0001] The present invention relates to a dry ice slow-release device, and more particularly to a dry ice slow-release device based on a bimetallic strip and its application. Background Art

[0002] Aquatic products are perishable and difficult to preserve. During online sales, ensuring the freshness and quality of products is an important challenge. If the preservation measures are not in place, the products may deteriorate when they reach consumers, affecting consumer satisfaction and trust. The common method is to use refrigerant such as ice bags to keep the aquatic products at a low temperature during logistics transportation, reducing the activity of endogenous enzymes and the reproduction of microorganisms, so as to achieve the purpose of preservation. However, for long-distance or high-temperature weather, a large number of ice bags are required during transportation, greatly increasing the transportation cost. The temperature during transportation is unstable and too many ice bags are likely to cause damage to the goods.

[0003] Dry ice, namely solid carbon dioxide, has a sublimation temperature of -78.5°C under normal pressure. Due to its extremely low temperature, it is often used for food preservation. However, the evaporation rate of dry ice is relatively fast, and it is easy to generate a huge pressure on the sealed container during use, thus limiting its wide application. Most of the existing dry ice preservation devices have problems such as short preservation time and serious waste of dry ice. Therefore, how to extend the dry ice preservation time and reduce dry ice waste has become an urgent problem to be solved in the current food preservation technology field. Chinese Patent Invention 202310880150.5 discloses a dry ice slow-release device, which realizes the slow release of dry ice through pressure control. Chinese Patent Invention 202011213350.8 discloses a dry ice slow-release insulation box, which realizes the slow release of dry ice through conventional valves and complex pipelines and is used for the live transportation and refrigeration of aquatic products. However, the above devices have complex structures, high costs, and are difficult to achieve automatic control, and are not suitable for ordinary online sales logistics transportation.

[0004] A bimetallic strip is a composite material composed of two metals or alloys with different thermal expansion coefficients tightly bonded together. When the temperature changes, due to the different thermal expansion degrees of the two metals, the bimetallic strip will bend and deform. Utilizing this property, the bimetallic strip can be used as a temperature sensor and actuator, and applied to fields such as temperature control switches, temperature indicators, and thermal relays. Currently, there are no related products of dry ice slow-release devices using bimetallic strips on the market. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an energy-saving, efficient, safe, stable and simple-structured dry ice slow-release device based on a bimetallic strip that can achieve automatic temperature adjustment.

[0006] The technical solution adopted by the present invention to solve the above technical problems is as follows: A dry ice slow-release device based on a bimetal sheet, comprising a box body and a box cover. A storage box is arranged inside the box body. Dry ice boxes for filling dry ice are respectively arranged at the upper and lower ends inside the storage box. A storage cavity for placing aquatic products is formed between the two dry ice boxes. A cold air circulation pipeline is communicated on the same side of the two dry ice boxes. A first pressure release control valve for discharging cold air into the cavity between the box body and the storage box is arranged at the bottom of the cold air circulation pipeline. A second pressure release control valve for discharging cold air outward is arranged on the box cover. A cold air transportation pipeline for transporting cold air to the storage cavity is communicated on the other side of the two dry ice boxes. A cold air release pipeline for releasing cold air into the storage cavity is communicated in the middle of the cold air transportation pipeline. The cold air release pipeline extends into the storage cavity and extends to the other side of the storage cavity. A plurality of cold air distribution flexible plates with through holes are evenly distributed on the cold air release pipeline. Bimetal temperature control valves for controlling the opening and closing of the cold air transportation pipeline are respectively arranged on both sides of the cold air release pipeline on the cold air transportation pipeline. When the temperature rises to a certain extent, the bimetal temperature control valve opens the cold air transportation pipeline, and the cold air transportation pipeline transports cold air to the storage cavity. When the temperature drops to a certain extent, the bimetal temperature control valve closes the cold air transportation pipeline, and the cold air transportation pipeline stops transporting cold air to the storage cavity.

[0007] Preferably, the bimetal temperature control valve includes a first valve body and a valve seat arranged horizontally. One end of the first valve body is located inside the storage cavity, and the other end thereof passes through the storage box and is fixed on the outer wall of the cold air transportation pipeline. The valve seat is fixedly arranged on the inner wall of the cold air transportation pipeline, and a cold air circulation hole is arranged in the middle of the valve seat. A bimetal sheet, an adjustable transmission rod, a hydraulic amplifier and a first valve core are sequentially arranged in the cavity of the first valve body from inside to outside. The bimetal sheet is longitudinally arranged in the first valve body and is located inside the storage cavity. The bimetal sheet bends inward. One end of the adjustable transmission rod is connected to the concave surface of the bimetal sheet, and the other end thereof is connected to one end of the hydraulic amplifier. The other end of the hydraulic amplifier is connected to the first valve core. The conical head of the first valve core cooperates with the cold air circulation hole. Under the action of the deformation driving force of the bimetal sheet, the first valve core horizontally moves to control the opening or closing of the cold air circulation hole. The first valve core is linked with the bimetal sheet. Therefore, the deformation amount of the bimetal sheet can be converted into the displacement amount of the first valve core. When the temperature inside the storage cavity gradually rises, the bimetal sheet can bend inward, and the first valve core moves towards the storage cavity, thereby opening the cold air circulation hole. When the temperature inside the storage cavity gradually drops, the bimetal sheet resets, and the first valve core moves towards the cold air transportation pipeline, thereby closing the cold air circulation hole.

[0008] Preferably, the bimetallic strip includes an inner metal strip and an outer metal strip. The inner metal strip and the outer metal strip are integrally connected by welding. The expansion coefficient of the inner metal strip is higher than that of the outer metal strip. This ensures that the elastic strain energy generated by the thermal strain of the bimetallic strip drives the bimetallic strips on both sides to quickly bend inward.

[0009] Preferably, a regulating knob for adjusting the bending degree of the initial state of the bimetallic strip is provided at the top of the first valve body. The bottom of the regulating knob extends into the first valve body and abuts against the top of the bimetallic strip. A heat-conducting metal for transferring heat to the bimetallic strip is provided at the bottom of the first valve body. The heat-conducting metal is clamped in the through hole at the bottom of the first valve body and abuts against the bottom of the bimetallic strip.

[0010] Preferably, pressure sensors are respectively provided on both sides of the hydraulic amplifier.

[0011] Preferably, an airtight heat-insulating layer is longitudinally provided in the first valve body and between the hydraulic amplifier and the outer wall of the cold air transportation pipeline. A first spring is sleeved on the first valve core. The first spring is located between the hydraulic amplifier and the airtight heat-insulating layer. The airtight heat-insulating layer vertically between the outer sides of the cold air transportation pipeline has two functions. The first is to isolate the cold air transportation pipeline from the bimetallic strip, so that the cold air in the cold air transportation pipeline cannot contact the bimetallic strip. The second is to ensure that the temperature control switch senses the temperature of the stored sample and then controls the opening and closing of the valve to keep the sample within the set temperature range. The function of the first spring is to cooperate with the valve core, so that after the valve core and the valve seat are closed, it is ensured that the valve core can be reset smoothly when the valve core is reset, and the closing of the valve core and the valve seat is released.

[0012] Preferably, the first pressure release control valve includes a second valve body and a second valve core. One end of the second valve body is provided with a first air outlet for communicating with the cold air circulation pipeline. The other end of the second valve body is provided with a first pressure regulating knob. The first pressure regulating knob is provided with a first exhaust hole for discharging the cold air in the second valve body to the outside. A second spring is provided in the second valve body and between the first pressure regulating knob and the second valve core. The tapered head at the other end of the second valve core cooperates with the first air outlet. When the pressure in the cold air circulation pipeline is greater than the elastic force of the second spring, the second valve core moves to open the first air outlet and the first exhaust hole is exposed outside the second valve body. When the pressure in the cold air circulation pipeline is less than or equal to the restoring force of the first spring, the second valve core moves to close the first air outlet and the first exhaust hole enters the second valve body.

[0013] Preferably, the second pressure release control valve includes a third valve body and a third valve core. One end of the third valve body is provided with a second air outlet for communicating with the cavity between the box body and the storage box. The other end of the third valve body is provided with a second pressure regulating knob. The second pressure regulating knob is provided with a second exhaust hole for discharging the cold air in the third valve body to the outside. A third spring is arranged in the third valve body between the second pressure regulating knob and the third valve core. The tapered head at the other end of the third valve core cooperates with the second air outlet. When the pressure in the cavity between the box body and the storage box is greater than the elastic force of the third spring, the third valve core moves to open the second air outlet and the second exhaust hole is exposed outside the third valve body. When the pressure in the cavity between the box body and the storage box is less than or equal to the restoring force of the third spring, the third valve core moves to close the second air outlet.

[0014] Preferably, a tray for fixing the dry ice box is arranged in the storage box. The box body and the box cover are connected by a hinge, and a heat preservation layer is arranged on the inner wall of the box body.

[0015] The present invention also provides an application of the above dry ice slow release device based on a bimetallic strip in the transportation of aquatic products.

[0016] Compared with the prior art, the advantages of the present invention are as follows: 1. Automatic temperature regulation: Through the design of the bimetallic strip temperature control valve, the device can automatically adjust the release of cold air according to the temperature in the storage cavity. When the temperature rises, the bimetallic strip bends, opens the cold air circulation hole, and releases cold air to lower the temperature. When the temperature drops, the bimetallic strip resets, closes the cold air circulation hole, and stops the release of cold air. This automatic adjustment mechanism ensures that aquatic products are stored at an appropriate temperature and avoids quality degradation caused by temperature fluctuations. The bimetallic strip temperature control valve mechanism opens or closes the fluid channel according to the deformation of the bimetallic strip, has a simple structure, is easy to manufacture and maintain; high reliability, no complex electronic components and external energy sources, and low failure rate; low cost, suitable for large-scale applications.

[0017] 2. Pressure control and release: The first pressure release control valve and the second pressure release control valve are arranged in the device to control the pressure in the cavity between the box body and the storage box and in the cold air circulation pipeline respectively. When the pressure exceeds the set value, the valve automatically opens to release the pressure, preventing equipment damage or safety hazards caused by excessive pressure. This pressure control mechanism improves the safety and stability of the device. At the same time, the first pressure release control valve is located at the bottom of the box body, and the second pressure release control valve is located on the box cover, which is beneficial to the formation of up and down convection circulation of cold air in the box body.

[0018] 3. Uniform cold air distribution: Through the design of the cold air release pipeline and the cold air distribution flexible plate, the cold air can be evenly distributed to all parts of the storage cavity, ensuring that the aquatic products are evenly cooled during storage, avoiding the situation of too high or too low local temperature, and further guaranteeing the preservation quality of the aquatic products.

[0019] 4. Compact structure and high efficiency: The structure of the device is designed compactly. The components such as the dry ice box, the storage cavity, and the cold air transportation pipeline are reasonably arranged, making full use of the internal space of the box body, and the overall structure design is compact and simple. At the same time, the combined use of the bimetallic strip temperature control valve and the pressure release control valve enables the dry ice to be released at a controllable speed. When the pressure is too high, the sublimated gas of the dry ice plays an insulating role between the sample and the main body of the incubator through external circulation, preventing the loss of the cold capacity of the dry ice. When the pressure further increases, the pressure control valve on the lid of the incubator is triggered to release the pressure, which not only ensures the effective utilization of the cold capacity of the dry ice but also avoids the potential danger brought by excessive pressure. Therefore, without the need for an external additional driving energy source, it can be automatically adjusted relying on the temperature change inside the box, enabling the device to maintain high-efficiency refrigeration while reducing energy waste and improving the overall energy efficiency.

[0020] 5. Adjustability and flexibility: The bimetallic strip temperature control valve and the pressure release control valve in the device are both equipped with adjustment knobs, and users can adjust the opening pressure and temperature threshold of the valve according to actual needs, increasing the flexibility and applicability of the device. This adjustability enables the device to adapt to different preservation requirements and environmental conditions.

[0021] 6. Heat preservation and heat insulation: The inner wall of the box body is provided with a heat preservation layer, effectively reducing the influence of external heat on the temperature inside the box and improving the heat preservation performance of the device. At the same time, the setting of the airtight heat insulation layer further prevents the leakage of cold air and the intrusion of external heat, ensuring the stability of the internal temperature of the device.

[0022] 7. Safety and reliability: The settings of components such as the hydraulic amplifier, pressure sensor, and spring in the device further enhance the safety and reliability of the device. The hydraulic amplifier can amplify the deformation driving force of the bimetallic strip to ensure that the valve can quickly respond to temperature changes; the pressure sensor monitors the pressure change in real time to prevent the pressure from being too high or too low; the setting of the spring ensures that the valve can quickly reset when the pressure changes, maintaining the stable operation of the device.

[0023] In summary, the dry ice slow-release device of the present invention based on a bimetallic strip, through designs in aspects such as automatic temperature regulation, pressure control, uniform distribution of cold air, compact structure, adjustability, heat preservation and insulation, and safety and reliability, does not require external energy and complex devices. Combining with appropriate packaging, it realizes the controllable release of dry ice, keeps aquatic products in cold storage and slight freezing preservation, achieves efficient, safe and stable preservation of aquatic products, maximally maintains the quality of aquatic products during the logistics transportation process, reduces the usage amount of dry ice and the logistics transportation cost, and has a wide application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the dry ice slow-release device of the present invention based on a bimetallic strip; Figure 2 is a schematic diagram of the structure of the bimetallic strip temperature control valve of the present invention; Figure 3 is a schematic diagram of the structure of the first pressure release control valve of the present invention; Figure 4 is a schematic diagram of the structure of the second pressure release control valve of the present invention; Figure 5 is the relationship between the temperature change and the preservation time in the dry ice slow-release device of the present invention and the traditional one; The markings in the figure are as follows: 1, box body; 2, box cover; 3, storage box; 4, dry ice box; 5, storage cavity; 6, cold air circulation pipeline; 7, first pressure release control valve; 8, second pressure release control valve; 9, cold air transportation pipeline; 10, cold air release pipeline; 11, cold air distribution soft board; 12, bimetallic strip temperature control valve; 13, first valve body; 14, valve seat; 15, cold air flow hole; 16, bimetallic strip; 17, adjustable transmission rod; 18, hydraulic amplifier; 19, first valve core; 20, inner metal sheet; 21, outer metal sheet; 22, adjustment knob; 23, heat-conducting metal; 24, pressure sensor; 25, airtight heat-insulating layer; 26, first spring; 27, second valve body; 28, second valve core; 29, first air outlet; 30, first pressure regulating knob; 31, first exhaust hole; 32, second spring; 33, third valve body; 34, third valve core; 35, second air outlet; 36, second pressure regulating knob; 37, second exhaust hole; 38, third spring; 39, support plate; 40, hinge; 41, heat-insulating layer; 42, heat-insulating backing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further describes the present invention in detail with reference to the embodiments of the drawings. I. Specific Embodiment

[0027] A dry ice slow-release device based on a bimetallic strip, as Figure 1As shown in the figure, it includes a box body 1 and a box cover 2. A storage box 3 is arranged inside the box body 1. Dry ice boxes 4 for filling dry ice are respectively arranged at the upper and lower ends inside the storage box 3. A storage cavity 5 for placing aquatic products is formed between the two dry ice boxes 4. A cold air circulation pipeline 6 is connected and arranged on the same side of the two dry ice boxes 4. A first pressure release control valve 7 for discharging cold air into the cavity between the box body 1 and the storage box 3 is arranged at the bottom of the cold air circulation pipeline 6. A second pressure release control valve 8 for discharging cold air outward is arranged on the box cover 2. A cold air transportation pipeline 9 for transporting cold air to the storage cavity 5 is connected and arranged on the other side of the two dry ice boxes 4. A cold air release pipeline 10 for releasing cold air into the storage cavity 5 is connected in the middle of the cold air transportation pipeline 9. The cold air release pipeline 10 extends into the storage cavity 5 and reaches the other side of the storage cavity 5. A number of cold air distribution flexible plates 11 with through holes (to avoid collision and damage to aquatic product materials) are evenly distributed on the cold air release pipeline 10. Bimetallic strip temperature control valves 12 for controlling the opening and closing of the cold air transportation pipeline 9 are respectively arranged on both sides of the cold air release pipeline 10 on the cold air transportation pipeline 9. When the temperature rises to a certain degree, the bimetallic strip temperature control valve 12 opens the cold air transportation pipeline 9, and the cold air transportation pipeline 9 transports cold air to the storage cavity 5. When the temperature drops to a certain degree, the bimetallic strip temperature control valve 12 closes the cold air transportation pipeline 9, and the cold air transportation pipeline 9 stops transporting cold air to the storage cavity 5.

[0028] In this specific embodiment, as Figure 2As shown, the bimetallic temperature control valve 12 includes a first valve body 13 and a valve seat 14 arranged horizontally. One end of the first valve body 13 is located in the storage cavity 5, and the other end passes through the storage box 3 and is fixed on the outer wall of the cold air transportation pipeline 9. The valve seat 14 is fixedly arranged on the inner wall of the cold air transportation pipeline 9, and a cold air circulation hole 15 is arranged in the middle of the valve seat 14. Inside the cavity of the first valve body 13, a bimetallic strip 16, an adjustable transmission rod 17, a hydraulic amplifier 18, and a first valve core 19 are arranged in sequence from inside to outside. The bimetallic strip 16 is arranged longitudinally in the first valve body 13 and is located in the storage cavity 5. The bimetallic strip 16 bends inward (the direction close to the center of the storage cavity 5 is the inner side, and the opposite is the outer side). One end of the adjustable transmission rod 17 is connected to the concave surface of the bimetallic strip 16, and the other end is connected to one end of the hydraulic amplifier 18. The other end of the hydraulic amplifier 18 is connected to the first valve core 19. The conical head of the first valve core 19 cooperates with the cold air circulation hole 15. Under the action of the deformation driving force of the bimetallic strip 16, the first valve core 19 moves horizontally to control the opening or closing of the cold air circulation hole 15. The first valve core 19 is linked with the bimetallic strip 16. Therefore, the deformation amount of the bimetallic strip 16 can be converted into the displacement amount of the first valve core 19. When the temperature in the storage cavity 5 gradually rises, the bimetallic strip 16 can bend inward, and the first valve core 19 moves toward the storage cavity 5, thereby opening the cold air circulation hole 15. When the temperature in the storage cavity 5 gradually decreases, the bimetallic strip 16 resets, and the first valve core 19 moves toward the cold air transportation pipeline 9, thereby closing the cold air circulation hole 15. The bimetallic strip 16 includes an inner metal sheet 20 and an outer metal sheet 21. The inner metal sheet 20 and the outer metal sheet 21 are integrally connected by welding. The expansion coefficient of the outer metal sheet 21 is higher than that of the inner metal sheet 20. It is ensured that the bimetallic strip 16 can be driven by the elastic strain energy generated by thermal strain to quickly bend inward on both sides (the direction close to the center of the storage cavity 5 is the inner side, and the opposite is the outer side). By adopting the bimetallic temperature control valve 12, when the temperature rises, a pulling force is generated through the deformation of the bimetallic strip 16, and the pulling force is amplified by the hydraulic device to open the valve, so that the cold air released by the sublimation of dry ice sequentially enters the storage cavity 5 through the cold air transportation pipeline 9 and the cold air release pipeline 10, reducing the ambient temperature in the storage cavity 5. When the ambient temperature in the storage cavity 5 gradually decreases, the bimetallic strip 16 contracts and restores upon cooling to generate a thrust, and the thrust is amplified by the hydraulic device to automatically close the valve and stop the cold air delivery, thereby keeping the aquatic products at a relatively stable temperature during the entire transportation process. The thicknesses of both the inner metal sheet 20 and the outer metal sheet 21 are 0.1 cm.

[0029] In this specific embodiment, as Figure 2As shown, an adjusting knob 22 for adjusting the bending degree of the initial state of the bimetal sheet 16 is provided at the top of the first valve body 13. The bottom of the adjusting knob 22 extends into the first valve body 13 and abuts against the top of the bimetal sheet 16. A heat-conducting metal 23 for transferring heat to the bimetal sheet 16 is provided at the bottom of the first valve body 13. The heat-conducting metal 23 is clamped in the through hole at the bottom of the first valve body 13 and abuts against the bottom of the bimetal sheet 16. By adjusting the adjusting knob 22, the initial bending degree of the bimetal sheet 16 is changed, thereby changing the initial trigger point of the bimetal temperature control valve 12, so that the products in the incubator can be maintained in different states such as refrigeration or slight freezing, meeting different preservation requirements. The heat-conducting metal 23 quickly transfers heat, enabling the bimetal sheet 16 to respond to temperature changes in a timely manner and improving the reaction speed of the system. Pressure sensors 24 are respectively provided on both sides of the hydraulic amplifier 18. An airtight heat-insulating layer 25 is longitudinally provided in the first valve body 13 and between the hydraulic amplifier 18 and the outer wall of the cold air transportation pipeline 9. A first spring 26 is sleeved on the first valve core 19, and the first spring 26 is located between the hydraulic amplifier 18 and the airtight heat-insulating layer 25.

[0030] In this specific embodiment, as Figure 3 shown, the first pressure release control valve 7 includes a second valve body 27 and a second valve core 28. One end of the second valve body 27 is provided with a first air outlet 29 for communicating with the cold air circulation pipeline 6. The other end of the second valve body 27 is provided with a first pressure regulating knob 30. A first exhaust hole 31 for discharging the cold air in the second valve body 27 to the outside is provided on the first pressure regulating knob 30. A second spring 32 is provided in the second valve body 27 between the first pressure regulating knob 30 and the second valve core 28. The tapered head at the other end of the second valve core 28 cooperates with the first air outlet 29. When the pressure in the cold air circulation pipeline 6 is greater than the elastic force of the second spring 32, the second valve core 28 moves to open the first air outlet 29 and the first exhaust hole 31 is exposed outside the second valve body 27. When the pressure in the cold air circulation pipeline 6 is less than or equal to the restoring force of the second spring 32, the second valve core 28 moves to close the first air outlet 29 and the first exhaust hole 31 enters the second valve body 27.

[0031] In this specific embodiment, as Figure 4As shown in the figure, the second pressure relief control valve 8 includes a third valve body 33 and a third valve core 34. One end of the third valve body 33 is provided with a second air outlet 35 for communicating with the cavity between the box body 1 and the storage box 3. The other end of the third valve body 33 is provided with a second pressure regulating knob 36. The second pressure regulating knob 36 is provided with a second exhaust hole 37 for discharging the cold air in the third valve body 33 to the outside. A second spring 32 is arranged in the third valve body 33 between the second pressure regulating knob 36 and the third valve core 33. The tapered head at the other end of the third valve core 34 cooperates with the second air outlet 35. When the pressure in the cavity between the box body 1 and the storage box 3 is greater than the elastic force of the third spring 38, the third valve core 34 moves to open the second air outlet 35 and the second exhaust hole 37 is exposed outside the third valve body 33. When the pressure in the cavity between the box body 1 and the storage box 3 is less than or equal to the restoring force of the third spring 38, the third valve core 34 moves to close the second air outlet 35.

[0032] Through the combined use of the bimetallic temperature control valve 12 and the first pressure relief control valve 7, the dry ice is released at a controllable speed. When the pressure is too high, the sublimated gas of the dry ice forms a low-temperature area between the storage box 3 and the box body 1 through the external circulation, reducing the influence of the external environment of the box body on the storage area and preventing the loss of the cold capacity of the dry ice. When the pressure further increases, the second pressure relief control valve 8 on the box cover 2 is triggered to release the pressure, which not only ensures the effective utilization of the cold capacity of the dry ice but also avoids the potential danger caused by excessive pressure. Therefore, without an additional external driving energy source, it can be automatically adjusted depending on the temperature change in the box body 1. Further, through the two-stage pressure control valve, the gradual release of the dry ice is controlled, and its refrigerating capacity is fully utilized to achieve the purpose of energy-saving and slow release, enabling the device to reduce energy waste while maintaining high-efficiency refrigeration and improving the overall energy efficiency.

[0033] A tray 39 for fixing the dry ice box 4 is arranged in the above-mentioned storage box 3. The box body 1 and the box cover 2 are connected by a hinge 40. The inner wall of the box body 1 is provided with a heat-insulating layer 41. The box body 1 is composed of a relevant container such as a reinforced foam box or an insulating plastic box. The inner side surface of the dry ice box 4 is provided with a heat-insulating backing plate 42. The dry ice box 4 can be a plastic container with a certain pressure resistance or a metal container with a heat-insulating function according to needs.

[0034] II. Application Example Control group: Packed in a common container with a certain amount of dry ice and allowed to sublimate and cool naturally. The conventional dry ice slow-release device can only keep the dry ice in a relatively slow sublimation process, preventing the dry ice from sublimating rapidly immediately and losing the ability to maintain low temperature in the subsequent process.

[0035] Put the same amount of dry ice in the dry ice slow-release device based on the bimetallic sheet designed in the present invention and let it be slowly released and insulated under the dual control of temperature and pressure. The temperature change curves of the two are shown as Figure 5 shown, byFigure 5 It can be seen that in the traditional dry ice preservation method (without the slow-release function), the dry ice is released uncontrollably, the temperature quickly drops to the lowest, and then gradually rises to room temperature. However, with the dry ice slow-release device designed by the present invention, the same amount of dry ice can reduce the temperature in the incubator to the set temperature range (generally, a micro-freezing temperature of about -2 to 4 °C or a refrigeration temperature of about 2 °C, and a lower temperature range can be adjusted according to needs), and the low-temperature holding time is extended by about 2.0 to 3.2 times.

[0036] The above description is not a limitation of the present invention, nor is the present invention limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention shall also fall within the protection scope of the present invention.

Claims

1. A dry ice slow-release device based on a bimetallic strip, comprising a box body (1) and a box cover (2), characterized in that: The box body (1) is provided with a storage box (3), and dry ice boxes (4) for filling dry ice are respectively provided at the upper and lower ends of the storage box (3), and a storage cavity (5) for placing aquatic products is formed between the two dry ice boxes (4). A cold air circulation pipe (6) is provided on the same side of the two dry ice boxes (4), and a first pressure release control valve (7) for discharging cold air into the cavity between the box body (1) and the storage box (3) is provided at the bottom of the cold air circulation pipe (6), and a second pressure release control valve (8) for discharging cold air outward is provided on the box cover (2); and a second pressure release control valve (8) for discharging cold air outward is provided on the other side of the two dry ice boxes (4). A cold air transport pipe (9) for transporting cold air to the storage chamber (5) is provided in the middle of the cold air transport pipe (9) with a cold air release pipe (10) for releasing cold air to the storage chamber (5). The cold air release pipe (10) extends into the storage chamber (5) and to the other side of the storage chamber (5). A plurality of cold air distribution soft plates (11) with through holes are evenly distributed on the cold air release pipe (10). Bimetallic temperature control valves (12) for controlling the opening and closing of the cold air transport pipe (9) are respectively provided on the cold air transport pipe (9) and located on both sides of the cold air release pipe (10).

2. A dry ice slow-release device based on a bimetallic strip according to claim 1, characterized in that: The bimetallic temperature control valve (12) comprises a first valve body (13) and a valve seat (14) which are arranged transversely, one end of the first valve body (13) is located in the storage cavity (5) and the other end thereof passes through the storage box (3) and is fixed on the outer wall of the cold air transport pipe (9), the valve seat (14) is fixedly arranged on the inner wall of the cold air transport pipe (9), and a cold air flow hole (15) is arranged in the middle of the valve seat (14); a bimetallic strip (16), an adjustable transmission rod (17), a hydraulic amplifier (18) and a first valve core (19) are arranged in sequence in the cavity of the first valve body (13) from the inside to the outside, and the bimetallic strip (16) is arranged in the cavity of the first valve body (13). 6) is longitudinally arranged in the first valve body (13) and located in the storage chamber (5), the bimetallic strip (16) is bent inward, one end of the adjustable transmission rod (17) is connected to the concave surface of the bimetallic strip (16) and the other end is connected to one end of the hydraulic amplifier (18), the other end of the hydraulic amplifier (18) is connected to the first valve core (19), the conical head of the first valve core (19) is matched with the cold air circulation hole (15), under the deformation driving force of the bimetallic strip (16), the first valve core (19) moves horizontally to control the opening or closing of the cold air circulation hole (15).

3. A dry ice slow-release device based on a bimetallic strip according to claim 2, characterized in that: The bimetallic sheet (16) comprises an inner metal sheet (20) and an outer metal sheet (21), the inner metal sheet (20) and the outer metal sheet (21) being integrally connected by welding, and the expansion coefficient of the inner metal sheet (20) is higher than the expansion coefficient of the outer metal sheet (21).

4. The dry ice slow-release device based on a bimetallic strip according to claim 2, characterized in that: The top of the first valve body (13) is provided with an adjusting knob (22) for adjusting the initial bending degree of the bimetallic strip (16); the bottom of the adjusting knob (22) extends into the first valve body (13) and abuts against the top of the bimetallic strip (16); the bottom of the first valve body (13) is provided with a heat-conducting metal (23) for transferring heat to the bimetallic strip (16); the heat-conducting metal (23) is embedded in the bottom through hole of the first valve body (13) and abuts against the bottom of the bimetallic strip (16).

5. The dry ice slow-release device based on a bimetallic strip according to claim 2, characterized in that: Pressure sensors (24) are respectively provided on both sides of the hydraulic amplifier (18).

6. The dry ice slow-release device based on a bimetallic strip according to claim 2, characterized in that: An airtight heat-insulating layer (25) is longitudinally arranged inside the first valve body (13) and between the hydraulic amplifier (18) and the outer wall of the cold air transport pipe (9); a first spring (26) is sleeved on the first valve core (19); and the first spring (26) is located between the hydraulic amplifier (18) and the airtight heat-insulating layer (25).

7. The dry ice slow-release device based on a bimetallic strip according to claim 2, characterized in that: The first pressure release control valve (7) comprises a second valve body (27) and a second valve core (28), one end of the second valve body (27) is provided with a first air outlet (29) for communicating with the cold air circulation pipe (6), the other end of the second valve body (27) is provided with a first pressure regulating knob (30), the first pressure regulating knob (30) is provided with a first exhaust hole (31) for discharging the cold air in the second valve body (27) to the outside, a second spring (32) is provided in the second valve body (27) and between the first pressure regulating knob (30) and the second valve core (28), the second valve body (27) is provided with a second spring (32), and the second valve core (28) is provided with a second spring (33). The conical head at the other end of the second valve core (28) cooperates with the first air outlet (29). When the pressure in the cold air circulation pipe (6) is greater than the elastic force of the second spring (32), the second valve core (28) moves to open the first air outlet (29) and the first air outlet (31) is exposed outside the second valve body (27). When the pressure in the cold air circulation pipe (6) is less than or equal to the restoring force of the first spring (26), the second valve core (28) moves to close the first air outlet (29) and the first air outlet (31) enters the second valve body (27).

8. The dry ice slow-release device based on a bimetallic strip according to claim 2, characterized in that: The second pressure release control valve (8) comprises a third valve body (33) and a third valve core (34); one end of the third valve body (33) is provided with a second air outlet (35) for communicating with the cavity between the box body (1) and the storage box (3); the other end of the third valve body (33) is provided with a second pressure regulating knob (36); the second pressure regulating knob (36) is provided with a second air outlet (37) for discharging cold air in the third valve body (33) to the outside; a third spring (37) is provided in the third valve body (33) and between the second pressure regulating knob (36) and the third valve core (34). 38), the conical head at the other end of the third valve core (34) cooperates with the second air outlet (35), when the pressure in the cavity between the box body (1) and the storage box (3) is greater than the elastic force of the third spring (38), the third valve core (34) moves to open the second air outlet (35) and the second air outlet (37) is exposed outside the third valve body (33), when the pressure in the cavity between the box body (1) and the storage box (3) is less than or equal to the restoring force of the third spring (38), the third valve core (34) moves to close the second air outlet (35).

9. The dry ice slow-release device based on a bimetallic strip according to claim 2, characterized in that: The storage box (3) is provided with a support plate (39) for fixing the dry ice box (4), the box body (1) and the box cover (2) are connected via a hinge (40), and the inner wall of the box body (1) is provided with a heat-insulating layer (41).

10. Use of the dry ice slow-release device based on a bimetallic strip according to any one of claims 1 to 9 in the transportation of aquatic products.

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