An energy-saving, cold-storage, negative-pressure, micro-ecological controlled atmosphere preservation cabinet

Abstract

This utility model relates to the field of cold chain logistics equipment technology, and in particular discloses an energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet, including an insulated cabinet body. The interior of the insulated cabinet body is divided into a cold storage chamber and a control chamber by a partition. A negative pressure pump is installed above the insulated cabinet body to remove air from the cold storage chamber. A refrigeration unit is fixed above the insulated cabinet body to cool the cold storage chamber. An air duct is fixed to the top of the cold storage chamber, and several ventilation holes are evenly arranged along the length of the sidewalls and bottom of the air duct. A static pressure box connected to the air duct is fixed in the control chamber. The air inlet of the static pressure box is connected to a cold air blower and a hot air blower via Y-type connectors. The beneficial effects are: through three core mechanisms—forced permeation precooling driven by negative pressure, closed-loop microenvironment humidification, and multi-factor dynamic synergistic controlled atmosphere—it completely solves the pain points of slow precooling, excessive water loss, and difficult atmosphere control in traditional preservation technologies, effectively improving the preservation efficiency of fruits and vegetables.

Description

Technical Field

[0001] This utility model relates to the field of cold chain logistics equipment technology, and in particular to an energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet. Background Technology

[0002] In our daily lives, many of the fruits and vegetables we eat require long-distance transportation. To ensure freshness, refrigerated containers are typically used during transport. However, existing preservation technologies have several significant problems:

[0003] 1. Slow pre-cooling speed and long time consumption:

[0004] Traditional freezers are like large refrigerators, relying on cold air to cool the food. However, the cold air needs to cool the air inside the freezer first before it can slowly penetrate the fruits and vegetables. This is similar to how corners farther from the air vent cool slower when using an air conditioner. Leafy greens (like spinach) need about 2 hours, while fruit vegetables (like tomatoes and peppers) can take up to 4 hours to reach their target temperature. During this time, the fruits and vegetables are still "breathing" and generating heat, making them prone to spoilage and rotting.

[0005] 2. Severe moisture loss:

[0006] Air conditioners constantly blowing air will remove moisture from the surface of fruits and vegetables. It's like placing vegetables in front of a fan for too long; they'll wilt. Data shows that fruits and vegetables transported using traditional methods lose an average of 3% of their water – equivalent to losing 3 pounds for every 100 pounds of vegetables. This not only affects their appearance but also their taste.

[0007] 3. Limited preservation effect:

[0008] Fruits and vegetables release ethylene gas (a ripening agent) in sealed environments, causing them to ripen and rot more quickly. Current technology can only control temperature, not precisely adjust the proportions of gases such as nitrogen and carbon dioxide. It's like keeping someone in a stuffy room; even with air conditioning on, it's still uncomfortable. Utility Model Content

[0009] This utility model is designed to solve the above-mentioned problems by proposing an energy-saving, cold-storage, negative-pressure, micro-ecological controlled atmosphere preservation cabinet.

[0010] The technical solution of this utility model is implemented as follows:

[0011] An energy-saving, cold-storage, negative-pressure, micro-ecological controlled atmosphere preservation cabinet includes an insulated cabinet body. The interior of the cabinet body is divided into a cold storage compartment and a control compartment by a partition. A negative-pressure pump is installed above the insulated cabinet body to remove air from the cold storage compartment. A refrigeration unit is fixed above the insulated cabinet body to cool the cold storage compartment. An air duct is fixed to the top of the cold storage compartment. The sidewalls and bottom of the air duct are arrayed with several vents at equal intervals along its length. A static pressure box connected to the air duct is fixed in the control compartment. The air inlet of the static pressure box is connected to a cold air blower and a hot air blower via Y-type connectors. One-way valves are installed in the channels connecting the Y-type connectors to the cold air blower and the hot air blower. The valve plate is connected to the air inlet of the air cooler, which is connected to a controlled atmosphere box. A make-up air pipe communicating with the interior of the cold storage room is formed on the side wall of the controlled atmosphere box. A one-way valve is installed in the make-up air pipe. A carbon dioxide storage tank, an ozone storage tank, and a nitrogen storage tank are installed inside the control room. The outlets of the carbon dioxide storage tank, the ozone storage tank, and the nitrogen storage tank are connected to the controlled atmosphere box. An ventilation fan for exchanging air between the inside and outside is installed on the top of the control room. An environmental data acquisition module for monitoring internal air data is installed on the inner wall of the cold storage room. A first cabinet door is installed at the end of the cold storage room away from the control room, and a second cabinet door is installed at the end of the control room away from the cold storage room.

[0012] Furthermore, the environmental data acquisition module collects data including air pressure, oxygen concentration, carbon dioxide concentration, ozone concentration, temperature and humidity, and acetylene concentration.

[0013] Furthermore, an atomizer is installed on the pipe connecting the static pressure box and the air duct, a water storage tank is provided in the control room, the water storage tank is connected to the atomizer, and a booster pump is installed on the pipe connecting the water storage tank and the atomizer.

[0014] Furthermore, the control room is equipped with a carbon dioxide generator connected to the carbon dioxide storage tank and an ozone generator connected to the ozone storage tank.

[0015] Furthermore, an industrial control host is fixed in the control room and electrically connected to the negative pressure pump, the environmental data acquisition module, the air cooler, the hot air blower, and the ventilation fan.

[0016] Furthermore, a waterproof and breathable membrane is also provided inside the air belt, and the waterproof and breathable membrane is installed between the atomizer and the static pressure box.

[0017] Furthermore, the outlet ends of the carbon dioxide storage tank, the ozone storage tank, and the nitrogen storage tank are all equipped with electromagnetic flow valves that are electrically connected to the industrial control host.

[0018] Furthermore, an acetylene removal machine is installed in the control room. The inlet of the acetylene removal machine is connected to the interior of the cold storage room, and the outlet of the acetylene removal machine is connected to the exterior of the insulated cabinet.

[0019] Furthermore, the first cabinet door is an insulated cabinet door, and a sealing ring is installed on the edge of the first cabinet door.

[0020] Furthermore, the air cooler includes a blower and a refrigeration pipe, and the refrigeration pipe of the air cooler is connected to the compressor of the refrigeration unit at the top of the insulated cabinet through a refrigerant connection pipe.

[0021] Furthermore, the control room is equipped with a solid-state battery for providing electrical power.

[0022] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0023] 1. By actively removing air from the cold storage room through a negative pressure pump, a negative pressure environment is established. Under the action of negative pressure, the low-temperature air generated by the air cooler can pass through the air belt and dense ventilation holes, forcibly penetrating the gaps between stacked fruits and vegetables, and directly acting on the surface and internal micropores of the fruits and vegetables to achieve rapid cooling.

[0024] 2. Rapid cooling effectively inhibits the vigorous respiration of fruits and vegetables during the pre-cooling stage, greatly reducing the risk of "suffocation" and rot caused by the accumulation of respiratory heat, thus laying a solid quality foundation for long-distance transportation.

[0025] 3. The negative pressure environment itself lowers the boiling point of water, making the humidification process more efficient and energy-saving. The high-humidity cold air permeates the entire cold storage room through the air vents, forming a "microenvironment moisturizing layer" on the surface of fruits and vegetables. This effectively counteracts the drying effect brought by the cold air circulation, reducing the water loss rate of fruits and vegetables during transportation to less than 1%, and greatly maintaining the plumpness and crisp taste of fruits and vegetables.

[0026] 4. The ozone generator provides a controllable concentration of ozone, which rapidly diffuses and penetrates under negative pressure, effectively killing spoilage bacteria on the surface of fruits and vegetables and in the air. Simultaneously, by injecting high-purity nitrogen to reduce oxygen concentration or supplementing with an appropriate amount of carbon dioxide, it precisely creates a low-oxygen dormancy environment suitable for different types of fruits and vegetables, significantly delaying metabolism and ripening.

[0027] 5. After the preservation period ends, the hot air blower can quickly send dry hot air into the cold storage room, and in combination with the negative pressure environment, replace the residual gas, effectively remove odors and any possible residual sterilization gas, and prepare for the next batch of storage, avoiding cross-contamination;

[0028] 6. The cooling pipes of the air cooler are connected to the compressor of the refrigeration unit on the top of the cabinet through refrigerant pipes to achieve efficient transfer of cooling capacity and reduce energy loss. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a perspective view of the present invention;

[0031] Figure 2 This is an axonometric sectional view of the present invention;

[0032] Figure 3 This is a top sectional view of the present invention;

[0033] Figure 4 This is a layout diagram of the control room of this utility model;

[0034] Figure 5 This is a circuit structure block diagram of this utility model;

[0035] Figure 6 This is a flowchart of the process of this utility model;

[0036] Figure 7 This is a graph showing the changes in air quality inside a cold storage facility under normal refrigerated storage conditions.

[0037] The annotations in the attached figures are explained as follows:

[0038] 1. Insulated cabinet; 2. Cold storage room; 3. Control room; 4. Refrigeration unit; 5. Negative pressure pump; 6. Air duct; 7. Ventilation vent; 8. Environmental data acquisition module; 9. Static pressure chamber; 10. Waterproof and breathable membrane; 11. Atomizer; 12. Air cooler; 13. Hot air blower; 14. One-way valve; 15. Industrial control host; 16. Controlled atmosphere box; 17. Carbon dioxide storage tank; 18. Ozone storage tank; 19. Acetylene removal machine; 20. Nitrogen storage tank; 21. Booster pump; 22. Water tank; 23. Ozone generator; 24. Carbon dioxide generator; 25. Second cabinet door; 26. Exhaust fan; 27. Solid-state battery; 28. First cabinet door. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] like Figures 1-5 As shown, an energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet includes an insulated cabinet body 1 with dimensions of 11.8m × 2.13m × 2.72m (40 feet). The insulation layer of the insulated cabinet body 1 and the first cabinet door 28 is made of polyurethane foam with a thickness ≥ 80mm. The interior of the insulated cabinet body 1 is divided into a cold storage compartment 2 and a control compartment 3 by a partition. A negative pressure pump 5 is installed above the insulated cabinet body 1 to remove air from the interior of the cold storage compartment 2. The negative pressure pump 5 is directly connected to the interior of the cold storage compartment 2 through a sealed pipe, creating a negative pressure environment (pressure range of -0.05 to -0.1MPa) during air extraction. A refrigeration unit 4 is fixed above the insulated cabinet body 1 to cool the interior of the cold storage compartment 2, with a cooling power of 10P and a total power of 12KW. A duct 6 is fixed to the top of the cold storage compartment 2. Several ventilation holes 7 are evenly spaced along the length of the duct 6's sidewalls and bottom. The ventilation holes 7 on the sidewalls of the duct 6 have a diameter of 0.5mm and are tilted downwards at 45° to ensure airflow covers the gaps between goods. A static pressure box 9 connected to the duct 6 is fixed in the control room 3. The air inlet of the static pressure box 9 is connected to a cold air blower 12 and a hot air blower 13 via Y-type connectors. One-way valve plates 14, made of silicone material and with a flip-plate structure, are installed in the channels connecting the Y-type connectors to the cold air blower 12 and the hot air blower 13 via torsion springs and rotating shafts. The one-way valve plates 14 have a response time of <0.1 seconds. Sealing rings are installed on the edges of the one-way valve plates 14 to prevent air leakage. The cold air blower 12 and the hot air blower 13 are connected in parallel via Y-type connectors. The one-way valve plates 14 allow… Gas can only flow in one direction into the static pressure chamber 9 to prevent cross-contamination of airflow. The air inlet of the evaporator 12 is connected to the controlled atmosphere box 16. The control room 3 is equipped with a carbon dioxide storage tank 17, an ozone storage tank 18, and a nitrogen storage tank 20. The outlets of the carbon dioxide storage tank 17, ozone storage tank 18, and nitrogen storage tank 20 are connected to the controlled atmosphere box 16. The outlets of the carbon dioxide storage tank 17, ozone storage tank 18, and nitrogen storage tank 20 are all equipped with electromagnetic flow valves electrically connected to the industrial control host 15. The controlled atmosphere box 16 serves as the gas mixing center. Carbon dioxide, ozone, and nitrogen are precisely controlled by the electromagnetic flow valves and then input into the controlled atmosphere box 16. Under negative pressure, they automatically flow into the cold storage chamber 2. At the same time, the evaporator 12 can be activated to actively accelerate the gas flow. The gas flows into the cold storage chamber 2. A gas supply pipe connected to the interior of the cold storage chamber 2 is formed on the side wall of the controlled atmosphere box 16. A one-way valve is installed in the gas supply pipe. After the mixed gas is pressure-equalized by the static pressure box 9, it diffuses evenly into the cold storage chamber 2 in a laminar flow form through the vent holes 7 of the air duct 6. The oxygen content in the cold storage chamber 2 is controlled at 1%~30%, and the carbon dioxide content is controlled at 1%~5%. An ventilation fan 26 for exchanging air inside and outside is installed on the top of the control room 3. It can be used to regulate the air in the controller 3. An environmental data acquisition module 8 for monitoring internal air data is installed on the inner wall of the cold storage chamber 2. A first cabinet door 28 is installed at the end of the cold storage chamber 2 away from the control room 3, and a second cabinet door 25 is installed at the end of the control room 3 away from the cold storage chamber 2.

[0041] In this embodiment, the environmental data acquisition module 8 includes a barometer (TE Connectivity's MS5611-01BA03), an oxygen concentration sensor (City Technology (Honeywell)'s 4OXV), a carbon dioxide concentration sensor (Sensirion's SCD40), an ozone concentration sensor (2B Technologies' O3-3E1), an acetylene concentration sensor (Alphasense's A4-ETHE), and a temperature and humidity sensor (Sensirion's SHT45). The acquired data includes air pressure, oxygen concentration, carbon dioxide concentration, ozone concentration, temperature and humidity, and acetylene concentration.

[0042] An atomizer 11 is installed on the pipe connecting the static pressure box 9 and the air duct 6. A water storage tank 22 is installed in the control room 3. The water storage tank 22 is connected to the atomizer 11. A booster pump 21 is installed on the pipe connecting the water storage tank 22 and the atomizer 11. The water in the water storage tank 22 is pressurized by the booster pump 21 and delivered to the atomizer 11. The atomized micron-sized water particles are driven by the airflow and enter the cold storage room 2 through the vent 7 on the air duct 6. The humidity in the cold storage room 2 is controlled at 50% to 90%.

[0043] In this embodiment, the control room 3 is equipped with a carbon dioxide generator 24 connected to the carbon dioxide storage tank 17, an ozone generator 23 connected to the ozone storage tank 18, and a nitrogen generator connected to the nitrogen storage tank 20, so as to facilitate the replenishment of other components and provide support for long-distance transportation.

[0044] In this embodiment, an industrial control host 15 is fixed in the control room 3 and electrically connected to the negative pressure pump 5, the environmental data acquisition module 8, the air cooler 12, the hot air cooler 13, and the ventilation fan 26. The industrial control host 15 has a built-in STC89C51 microcontroller and an IoT-enabled WiFi communication module, and an external touch screen. The STC89C51 is an ISP (In-System Programming) chip with an 8051 core, with a maximum operating clock frequency of 80MHz. It contains 8K bytes of Flash read-only programmable memory that can be repeatedly erased and rewritten 1000 times. The device is compatible with the standard MCS-51 instruction set and the 80C51 pin structure. The chip integrates a general-purpose 8-bit central processing unit and an ISP Flash memory unit. The WiFi communication module uses the ESP-07 WiFi module, which employs the ESP8266 chip. This module integrates a 32-bit microprocessor in a compact package and supports Wi-Fi MAC / BB / RF / PA / LNA. It supports the standard IEEE 80211b / g / n protocols and a complete TCP / IP protocol stack. Using this module, developers can connect their designed systems to a network or establish independent network controllers. The industrial control host 15 incorporates a remote control system for fruit and vegetable preservation, as described in patent application number 2018105081747. Data from the industrial control host 15 can be transmitted in real-time to a remote monitoring and management center via the WiFi communication module, allowing for remote monitoring and control by personnel at the center, facilitating the push of corresponding fruit and vegetable storage data.

[0045] The industrial control host 15 dynamically adjusts the power of the negative pressure pump based on the air pressure feedback from the environmental data acquisition module 8 to achieve constant pressure control. The industrial control host 15 automatically replenishes and corrects the air every 2 hours based on the oxygen / carbon dioxide concentration data in the cold storage room 2. The air quality in the cold storage room 2 can be set by the industrial control host 15, such as: leafy green vegetables: 10-15% oxygen, 3-5% carbon dioxide; berries: 15-20% oxygen, 1-3% carbon dioxide. All percentages mentioned above are by volume.

[0046] In this embodiment, a waterproof and breathable membrane 10 is also provided inside the air duct 6. The waterproof and breathable membrane 10 is installed between the atomizer 11 and the static pressure box 9. The waterproof and breathable membrane 10 blocks liquid water leakage and only allows gaseous water molecules to pass through, thus preventing water vapor in the cold storage chamber 2 from flowing back into the static pressure box 9.

[0047] Cold storage compartment 2 stores fresh fruits and vegetables. These fresh fruits and vegetables remain living organisms within cold storage compartment 2, still capable of respiration, absorbing O2, releasing CO2, and releasing ethylene, along with heat. Due to the good airtightness of cold storage compartment 2, as the storage time of fresh fruits and vegetables in cold storage compartment 2 increases, the cumulative respiration will inevitably lead to a gradual increase in CO2 content, a gradual decrease in O2 content, and a sharp increase in ethylene content (e.g., ...). Figure 7 (As shown in the figure) Changes in the content of these gases in the cold storage chamber 2 have a significant impact on the storage and preservation quality of stored fruits and vegetables. In this embodiment, an acetylene removal machine 19 is installed in the control room 3. The inlet of the acetylene removal machine 19 is connected to the gas enrichment area at the top of the cold storage chamber 2 to extract acetylene-containing gas. The outlet of the acetylene removal machine 19 is connected to the outside of the insulated cabinet 1. Acetylene is decomposed into carbon dioxide and water by an internal catalyst (such as palladium-based material), and the non-toxic gas is discharged outside the cabinet. The removal frequency is triggered according to the acetylene concentration data to avoid the ripening effect. The ethylene content in the cold storage chamber 2 is controlled at 0-5 ppm. During the storage process, the industrial control host 15 adjusts the atmosphere in the cold storage chamber 2 and dynamically adjusts the content of gases such as O2, CO2, and ethylene in the cold storage according to the respiration rate of the stored fruits and vegetables to adapt to the storage and preservation process requirements of the stored fruits and vegetables, creating a "breathing" cold storage and extending the shelf life of fruits and vegetables.

[0048] In this embodiment, the first cabinet door 28 is an insulated cabinet door. The edge of the first cabinet door 28 is provided with a Y-shaped negative pressure sealing ring, and the door frame is bonded with a rubber and plastic sealing strip. The first cabinet door 28 is sealed with negative pressure by a negative pressure single-sided self-sealing rubber and plastic strip to prevent pressure loss.

[0049] In this embodiment, the air cooler 12 includes a blower and a refrigeration pipe, and the hot air blower 13 includes a blower and an electric heating element. The refrigeration pipe of the air cooler 12 is connected to the compressor of the refrigeration unit 4 at the top of the insulation cabinet 1 through a refrigerant connection pipe. The refrigeration pipe of the air cooler 12 and the refrigeration unit 4 share the compressor circuit, and the cooling capacity is distributed through a diversion valve. When the environmental data acquisition module 8 detects that the temperature is higher than the set value (e.g., 4°C), the air cooler 12 starts forced circulation cooling. When the temperature is too low, the hot air blower 13 intervenes to raise the temperature.

[0050] In this embodiment, a solid-state battery 27 for providing power is installed inside the control room 3. The solid-state battery 27 is electrically connected to all power-consuming equipment and maintains the system operation for ≥48 hours when the external power is cut off, ensuring the stability of the controlled atmosphere environment and providing support for long-distance power outage transportation.

[0051] The working principle of this utility model is as follows: Figure 6As shown, during use, after placing vegetables and fruits into the cold storage compartment 2, close the first cabinet door 28 to ensure airtightness. Use the negative pressure pump 5 to evacuate the air from the cold storage compartment 2, creating a negative pressure state (pressure range -0.05 to -0.08 MPa). At this time, there is very little air inside the cold storage compartment 2. The industrial control host 15 monitors the pressure inside the cold storage compartment 2 (Note: the pressure value is provided by the environmental data acquisition module 8). Once a suitable pressure is reached, the industrial control host 15 prioritizes opening the electromagnetic flow valve at the outlet of the ozone storage tank 18 to control the release of high-pressure ozone from the ozone storage tank 18. Under the action of negative pressure, the ozone automatically and quickly fills the cold storage compartment 2 to sterilize the surface of the vegetables and fruits inside. Sterilization lasts for 30 minutes. The ozone concentration is monitored in real time by the environmental data acquisition module 8. Once a set threshold (e.g., 10 ppm) is reached, the module automatically shuts off and controls the release of nitrogen from the nitrogen storage tank 20 to fill the cold storage compartment 2 and replace residual ozone. Oxygen is introduced, and then carbon dioxide is released from the carbon dioxide storage device 17 to fill the cold storage compartment 2 to achieve a reasonable concentration, reducing the oxygen concentration to 3%-5% to inhibit the respiration of fruits and vegetables. The speed at which ozone, carbon dioxide, and nitrogen enter the cold storage compartment 2 is accelerated by the cold air blower 12 and the hot air blower 13. Then, the refrigeration unit 4 is started to cool the cold storage compartment 2 and sterilize and perform dormancy control atmosphere according to the characteristics of the stored vegetables and fruits. The acetylene removal machine 19 can treat the acetylene in the gas in the cold storage compartment 2 to convert it into non-toxic carbon dioxide and water, effectively improving the freshness efficiency of vegetables. The storage temperature is the freezing point temperature +1℃. After the vegetables and fruits are stored, the first cabinet door 28 is opened to take out the vegetables and fruits. Then, the hot air blower 13 delivers air to the cold storage compartment 2. The hot air blower 13 continuously blows hot air at 60℃ for 10 minutes to decompose organic residues. The air flow blows out the odor inside the cold storage compartment 2, reducing the residual odor inside the cold storage compartment 2.

[0052] This utility model of a cold storage cabinet is suitable for various agricultural products requiring end-to-end cold chain transportation, such as fresh fruits and vegetables, chilled meat, aquatic products, low-temperature frozen products, poultry eggs, and live aquatic products. The empty container has a volume of 40-56m³. 3The empty container weighs 6 tons, with a temperature control range of -18℃ to 15℃ and a temperature control accuracy of 0.1℃. The temperature for cold storage is 1℃ above the freezing point. The controlled atmosphere storage maintains an oxygen content of 1-30% and a carbon dioxide content of 1-5%. A 15KW diesel generator (220V / 380V) can be installed in the control room for power supply. Each type of fruit and vegetable has an optimal storage temperature, which is the point at which the fruit or vegetable is close to freezing, i.e., the "freezing point." Different varieties of fruits and vegetables, and even the same type, will have different freezing points due to differences in sugar content, acidity, and water content at different stages of maturity and in different geographical environments. Before each batch of fruits and vegetables is placed in cold storage, its freezing point temperature is measured to determine the optimal cold storage temperature control range, generally "freezing point temperature ---- freezing point temperature + 1-2℃". For example, if winter jujubes are stored at 0℃ to 2℃, they can only be stored for 1-2 months, with water and weight loss as high as 3% to 5%, and the taste deteriorates; while if they are stored at freezing point temperature to freezing point temperature +1℃ (-2℃ to -1℃), the storage and preservation period is extended to 3-4 months, with water and weight loss of only 1% to 2% to 3%, and the taste remains basically unchanged.

[0053] The ice-temperature zone refers to the temperature range below 0°C and above freezing point, often abbreviated as "ice temperature." Cold storage facilities that maintain their temperature within this ice-temperature zone are defined as "ice-temperature storage facilities." Ice-temperature storage is the third generation of preservation technology, following refrigeration and freezing.

[0054] This solution uses precise temperature control to maintain the storage temperature more accurately near freezing point, within 1-2°C (≤0°C) of freezing point. This results in higher quality stored fruits, vegetables, and other foods, and is known as a "freezing point storage".

[0055] The circuit connection involved in this utility model is a common method used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. It belongs to the widely used prior art.

[0056] Components not described in detail in this article are existing technologies.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving, cold-storage, negative-pressure, micro-ecological controlled atmosphere preservation cabinet, characterized in that: The system includes an insulated cabinet (1), which is divided into a cold storage room (2) and a control room (3) by a partition. A negative pressure pump (5) is installed above the insulated cabinet (1) to remove air from the cold storage room (2). A refrigeration unit (4) is fixed above the insulated cabinet (1) to cool the cold storage room (2). A fan duct (6) is fixed at the top of the cold storage room (2). Several ventilation holes (7) are evenly spaced along the length of the side wall and bottom of the fan duct (6). A static pressure box (9) connected to the fan duct (6) is fixed in the control room (3). The air inlet of the static pressure box (9) is connected to a cold air blower (12) and a hot air blower (13) through a Y-type connector. One-way valve plates (14) are installed in the channels connecting the Y-type connector to the cold air blower (12) and the hot air blower (13). The cold air blower (12) An air inlet is connected to a controlled atmosphere box (16). A gas supply pipe is formed on the side wall of the controlled atmosphere box (16) and communicates with the interior of the cold storage room (2). A one-way valve is installed in the gas supply pipe. A carbon dioxide storage tank (17), an ozone storage tank (18), and a nitrogen storage tank (20) are installed inside the control room (3). The outlets of the carbon dioxide storage tank (17), the ozone storage tank (18), and the nitrogen storage tank (20) are connected to the controlled atmosphere box (16). An air exchange fan (26) for exchanging air inside and outside is installed on the top of the control room (3). An environmental data acquisition module (8) for monitoring internal air data is installed on the inner wall of the cold storage room (2). A first cabinet door (28) is installed at the end of the cold storage room (2) away from the control room (3). A second cabinet door (25) is installed at the end of the control room (3) away from the cold storage room (2).

2. The energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet according to claim 1, characterized in that: The environmental data acquisition module (8) collects data including air pressure, oxygen concentration, carbon dioxide concentration, ozone concentration, temperature and humidity, and acetylene concentration.

3. The energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet according to claim 1, characterized in that: An atomizer (11) is installed on the pipe connecting the static pressure box (9) and the air belt (6). A water storage tank (22) is provided in the control room (3). The water storage tank (22) is connected to the atomizer (11). A booster pump (21) is installed on the pipe connecting the water storage tank (22) and the atomizer (11).

4. The energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet according to claim 1, characterized in that: The control room (3) is equipped with a carbon dioxide generator (24) connected to the carbon dioxide storage tank (17) and an ozone generator (23) connected to the ozone storage tank (18).

5. The energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet according to claim 1, characterized in that: The control room (3) is equipped with an industrial control host (15) that is electrically connected to the negative pressure pump (5), the environmental data acquisition module (8), the air cooler (12), the hot air blower (13), and the ventilation fan (26).

6. The energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet according to claim 3, characterized in that: A waterproof and breathable membrane (10) is also provided inside the air belt (6), and the waterproof and breathable membrane (10) is installed between the atomizer (11) and the static pressure box (9).

7. The energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet according to claim 5, characterized in that: The outlets of the carbon dioxide storage tank (17), the ozone storage tank (18), and the nitrogen storage tank (20) are all equipped with electromagnetic flow valves that are electrically connected to the industrial control host (15).

8. The energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet according to claim 1, characterized in that: An acetylene removal machine (19) is installed in the control room (3). The air inlet of the acetylene removal machine (19) is connected to the interior of the cold storage room (2), and the air outlet of the acetylene removal machine (19) is connected to the outside of the heat preservation cabinet (1).

9. The energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet according to claim 1, characterized in that: The air cooler (12) includes a blower and a refrigeration pipe. The refrigeration pipe of the air cooler (12) is connected to the compressor of the refrigeration unit (4) on the top of the insulated cabinet (1) through a refrigerant connection pipe.

10. The energy-saving cold storage negative pressure micro-ecological controlled atmosphere preservation cabinet according to claim 1, characterized in that: The control room (3) is equipped with a solid-state battery (27) for providing electrical power.

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