Negative pressure adjusting type multifunctional refrigerator car

Abstract

The invention discloses a negative pressure adjusting type multifunctional refrigerator car, and particularly relates to the technical field of refrigerated transport tools, the negative pressure adjusting type multifunctional refrigerator car comprises a car body, a compartment is mounted on the car body, a compressor is mounted on the front side of the exterior of the compartment, a nitrogen supply mechanism connected with the compartment is arranged on one side of the compressor, and an exhaust mechanism connected with the compartment is arranged on one side of the nitrogen supply mechanism; the top of the front end of the compartment is provided with a condenser connected with the compressor, the condenser is connected with an evaporator, the middle of the interior of the compartment is provided with a third partition plate, the two sides of the third partition plate are provided with first partition plates, each first partition plate is provided with a fan, one side of each first partition plate is provided with a second partition plate, and the top end of each second partition plate is connected with a nitrogen conveying assembly. The bottom end of each nitrogen conveying assembly is provided with an emptying assembly, and the bottom end of each emptying assembly is provided with a plurality of infrared sensors. The fresh-keeping effect of fresh agricultural products is effectively improved, efficient utilization and circulation of nitrogen are achieved, the sealing performance of the compartment is guaranteed, and the advantages of flexible unloading operation and energy saving are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerated transport vehicles, and more particularly to a multifunctional refrigerated vehicle with negative pressure regulation. Background Art

[0002] As the cold-chain transportation industry for fresh agricultural products is booming, the technical limitations of traditional refrigerated trucks have become increasingly prominent, becoming a key factor restricting the industry from further improving transportation quality and efficiency.

[0003] Traditional refrigerated trucks have serious deficiencies in gas environment regulation. The gas composition and air pressure management inside the compartment are extensive, usually relying only on a simple refrigeration cycle to maintain low temperatures, and are unable to accurately adjust the air pressure state inside the compartment. During transportation, outside air can easily penetrate through the gaps in the compartment, making it difficult to control the oxygen content in the compartment. In an oxygen-rich environment, the respiration of fresh agricultural products intensifies, accelerating metabolism and water loss, which in turn leads to quality deterioration and a significant shortening of the shelf life. For example, in conventional refrigerated transportation, strawberries may become soft and spoiled in just a few days due to the enhanced respiration caused by excessive oxygen, seriously affecting their commodity value and food safety.

[0004] The lack of a gas recycling mechanism is also a major drawback of traditional refrigerated trucks. During transportation, the gas in the car is not effectively circulated and rationally reused. The refrigeration process relies solely on air as a heat transfer medium. However, under negative pressure, the air in the car is thin, making it difficult for the cold generated by the evaporator to spread quickly and evenly in the car, resulting in uneven temperature distribution. This not only reduces the refrigeration efficiency, but also causes uneven cooling of agricultural products in different parts of the car, affecting the overall preservation effect.

[0005] In addition, traditional refrigerated trucks lack effective means for testing and maintaining the sealing performance of the compartments. When the sealing performance of the compartment doors and compartment joints is poor, it is difficult to detect and deal with it in time before or during transportation, further exacerbating the problems of gas leakage and temperature fluctuations, and burying hidden dangers for the safe transportation of fresh agricultural products.

[0006] Therefore, a multifunctional refrigerated vehicle with negative pressure regulation is now proposed. Summary of the invention

[0007] In order to overcome the above-mentioned defects of the prior art, the present invention provides a multifunctional refrigerated vehicle with negative pressure regulation to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multifunctional refrigerated vehicle with negative pressure regulation, comprising a vehicle body, the vehicle body is connected to a program control unit, the program control unit comprises a software control system and a hardware drive unit, the hardware drive unit is controlled to work by the software control system, a compartment is installed on the vehicle body, a compartment door is installed on the compartment, a compressor is installed on the front side of the compartment, a nitrogen supply mechanism connected to the compartment is provided on one side of the compressor, an exhaust mechanism connected to the compartment is provided on one side of the nitrogen supply mechanism, and a compressor connected to the compressor is installed on the top of the front end of the compartment. A condenser connected to the condenser is connected to an evaporator, the evaporator is installed at the front end of the interior of the carriage, a third partition is provided in the middle of the carriage, first partitions at the bottom of the evaporator are provided on both sides of the third partition, fans are installed on each of the first partitions, a second partition is provided on one side of each of the first partitions, a nitrogen delivery component is connected to the top of each of the second partitions, an emptying component is installed at the bottom of each of the nitrogen delivery components, a plurality of infrared sensors are installed at the bottom of each of the emptying components, an exhaust window is provided on each of the second partitions, and each of the exhaust windows is connected with an opening and closing component; The nitrogen supply mechanism comprises a nitrogen tank, a bidirectional vacuum pump, a carbon molecular sieve adsorption column, a third solenoid valve, a nitrogen delivery main pipe, a first nitrogen delivery sub-pipe, a second nitrogen delivery sub-pipe, a fourth solenoid valve and a fifth solenoid valve, wherein the nitrogen tank is connected to a bidirectional vacuum pump, the bidirectional vacuum pump is connected to a carbon molecular sieve adsorption column, the third solenoid valve is installed on a pipeline connected between the bidirectional vacuum pump and the carbon molecular sieve adsorption column, the carbon molecular sieve adsorption column is connected to a nitrogen delivery main pipe, the nitrogen delivery main pipe is connected to a first nitrogen delivery sub-pipe and a second nitrogen delivery sub-pipe, the first nitrogen delivery sub-pipe and the second nitrogen delivery sub-pipe are both connected to the carriage, and the fourth solenoid valve and the fifth solenoid valve are installed on the first nitrogen delivery sub-pipe and the second nitrogen delivery sub-pipe, respectively; The nitrogen delivery assembly includes a delivery pipe, an exhaust pipe, a nozzle, a sixth solenoid valve, a delivery branch pipe and a seventh solenoid valve, one end of the delivery pipe is connected to the second baffle, the other end of the delivery pipe is equipped with an exhaust pipe, a plurality of nozzles are obliquely arranged on the exhaust pipe, a sixth solenoid valve is installed at the connection between the exhaust pipe and the delivery pipe, a delivery branch pipe is installed at the bottom end of the delivery pipe, and the seventh solenoid valve is installed on the delivery branch pipe; The emptying assembly includes a fixed partition, a folding airbag, a bottom box and a slide groove. The fixed partition is installed at the top of the interior of the carriage. The bottom end of the fixed partition is adhered with a folding airbag, and the bottom end of the delivery branch pipe enters the folding airbag through the fixed partition. The bottom end of the folding airbag is fixed with a bottom box, and a plurality of slide grooves are opened on both sides of the bottom box. A temperature sensor and a pressure sensor are installed on each of the second partitions, a plurality of guide rails are installed on the inner wall of the carriage and the third partition, and each of the bottom boxes slides with the corresponding guide rails through the slide grooves opened on both sides.

[0009] Preferably, a plurality of tension springs are arranged in the foldable airbag, the top of each tension spring is connected to the fixed partition, and the bottom of each tension spring is connected to the bottom box.

[0010] Preferably, the exhaust mechanism includes a one-way vacuum pump, an air suction main pipe, a first air suction sub-pipe, a second air suction sub-pipe, a first solenoid valve, a second solenoid valve and an exhaust pipe, the output end of the one-way vacuum pump is connected to the exhaust pipe, the input end of the one-way vacuum pump is connected to the air suction main pipe, the air suction main pipe is connected to the first air suction sub-pipe and the second air suction sub-pipe, and the first solenoid valve and the second solenoid valve are respectively installed on the first air suction sub-pipe and the second air suction sub-pipe.

[0011] Preferably, the opening and closing assembly comprises an electric push rod, a sealing plate and an airbag ring, the sealing plate is installed at the telescopic end of the electric push rod, and the airbag ring is fixed to the edge of the sealing plate.

[0012] Preferably, a third partition is provided inside the compartment, and the third partition divides the compartment into two storage rooms, and the front end of each storage room is separated by a second partition with a ventilation room, and the top of each ventilation room is separated by a first partition with a cold air room.

[0013] Preferably, the first nitrogen delivery auxiliary pipe, the second nitrogen delivery auxiliary pipe, the first air intake auxiliary pipe and the second air intake auxiliary pipe are respectively connected to corresponding ventilation chambers, each of the delivery pipes is respectively connected to a corresponding cold air chamber, and the evaporator is arranged in two cold air chambers.

[0014] Preferably, a sealing groove is provided on the side of the exhaust window facing the ventilation chamber, an annular groove is provided in the sealing groove, the sealing plate is plug-fitted with the sealing groove, and the airbag ring is extrusion-fitted with the annular groove.

[0015] Preferably, each ventilation chamber is equipped with an intelligent vacuum safety valve.

[0016] Technical effects and advantages of the present invention: The exhaust mechanism makes the interior of the carriage a negative pressure close to a vacuum state, reducing the respiration and oxidation risk of fresh agricultural products. After filling with nitrogen, it is guaranteed to be stored and transported at normal pressure and specified temperature. Nitrogen is used instead of air as the flow medium. After being cooled by the evaporator, the nitrogen can be quickly and evenly diffused into the carriage, which improves the cooling efficiency and enables fresh agricultural products to reach a suitable storage temperature more quickly, avoiding fresh agricultural products being in a negative pressure state for a long time, which may cause internal moisture overflow or skin cracking, thereby further improving the preservation quality, effectively inhibiting the metabolism of agricultural products and extending the shelf life.

[0017] The nitrogen supply mechanism cooperates with various components in the car. When filling nitrogen into the storage room, the nitrogen filling amount can be controlled according to the infrared sensor detection, which can reduce nitrogen waste and avoid crushing fresh agricultural products. At the same time, the folding airbag is expanded to displace the remaining space in the storage room, so that the cooled nitrogen can quickly cool the agricultural products and improve the timeliness of preservation.

[0018] When unloading, the nitrogen in the storage room can be pumped back and the oxygen can be automatically filtered out for recycling, which saves nitrogen resources and reduces transportation costs. For example, during multiple transportation processes, the amount of nitrogen replenishment is reduced, saving expenses.

[0019] By using the exhaust mechanism in conjunction with the pressure sensor and opening and closing components, the carriage can be well sealed, and the air pressure changes can be detected in real time, and airtightness problems such as loose door closures can be discovered in time, ensuring a stable environment in the carriage during transportation and preventing outside air from entering and affecting the quality of agricultural products.

[0020] The two storage rooms can be managed separately to avoid leakage to the unloaded storage room during unloading, which improves the convenience of unloading. After unloading, the low-temperature nitrogen stored in the folding airbag can pre-cool the incoming air, reduce the temperature change, improve the refrigeration efficiency during the second transportation, and reduce energy consumption. For example, in multiple transportation cycles, the overall energy consumption is reduced, energy is saved, and transportation costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a side view stereoscopic structural schematic diagram of the present invention.

[0023] Figure 3 It is a schematic diagram of the internal structure of the carriage of the present invention.

[0024] Figure 4 It is a schematic structural diagram of the opening and closing assembly of the present invention.

[0025] Figure 5 It is a schematic structural diagram of the exhaust mechanism of the present invention.

[0026] Figure 6 It is a structural schematic diagram of the nitrogen supply mechanism of the present invention.

[0027] Figure 7 It is a schematic diagram of the connection structure of the nitrogen delivery component and the emptying component of the present invention.

[0028] Figure 8 It is a schematic structural diagram of the nitrogen delivery assembly of the present invention.

[0029] Fig. 9 It is a schematic diagram of the bottom structure of the bottom box of the present invention.

[0030] The accompanying drawings are marked as follows: 1, vehicle body; 2, vehicle compartment; 3, compartment door; 4, compressor; 5, condenser; 6, nitrogen supply mechanism; 601, nitrogen tank; 602, two-way vacuum pump; 603, carbon molecular sieve adsorption column; 604, third solenoid valve; 605, nitrogen delivery main pipe; 606, first nitrogen delivery auxiliary pipe; 607, second nitrogen delivery auxiliary pipe; 608, fourth solenoid valve; 609, fifth solenoid valve; 7, opening and closing assembly; 701, electric push rod; 702, sealing plate; 703, air bag ring; 8, evaporator; 9, first partition; 10, fan; 11, second partition; 12, exhaust mechanism; 1201, one-way vacuum pump; 1202, suction main pipe Tube; 1203, first air suction auxiliary pipe; 1204, second air suction auxiliary pipe; 1205, first solenoid valve; 1206, second solenoid valve; 1207, discharge pipe; 13, third partition; 14, temperature sensor; 15, pressure sensor; 16, nitrogen delivery component; 1601, delivery pipe; 1602, exhaust duct; 1603, nozzle; 1604, sixth solenoid valve; 1605, delivery branch pipe; 1606, seventh solenoid valve; 17, emptying component; 1701, fixed partition; 1702, folding airbag; 1703, bottom box; 1704, slide; 18, guide rail; 19, exhaust window; 20, infrared sensor. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] As attached Figure 1-Figure 9A multifunctional refrigerated vehicle with negative pressure regulation is shown, comprising a vehicle body 1, the vehicle body 1 is connected to a program control unit, the program control unit comprises a software control system and a hardware drive unit, the hardware drive unit is controlled by the software control system to work, a compartment 2 is installed on the vehicle body 1, a compartment door 3 is installed on the compartment 2, a compressor 4 is installed on the front side of the outside of the compartment 2, a nitrogen supply mechanism 6 connected to the compartment 2 is provided on one side of the compressor 4, an exhaust mechanism 12 connected to the compartment 2 is provided on one side of the nitrogen supply mechanism 6, a condenser 5 connected to the compressor 4 is installed on the top of the front end of the compartment 2, and the condenser 5 is connected to a steam generator. evaporator 8, the evaporator 8 is installed at the front end of the interior of the carriage 2, a third partition 13 is provided in the middle of the carriage 2, first partitions 9 at the bottom of the evaporator 8 are provided on both sides of the third partition 13, a fan 10 is installed on each of the first partitions 9, a second partition 11 is provided on one side of each of the first partitions 9, a nitrogen delivery component 16 is connected to the top of each of the second partitions 11, an emptying component 17 is installed at the bottom of each of the nitrogen delivery components 16, a plurality of infrared sensors 20 are installed at the bottom of each of the emptying components 17, an exhaust window 19 is provided on each of the second partitions 11, and each of the exhaust windows 19 is connected with an opening and closing component 7; The nitrogen supply mechanism 6 includes a nitrogen tank 601, a bidirectional vacuum pump 602, a carbon molecular sieve adsorption column 603, a third solenoid valve 604, a nitrogen delivery main pipe 605, a first nitrogen delivery sub-pipe 606, a second nitrogen delivery sub-pipe 607, a fourth solenoid valve 608 and a fifth solenoid valve 609, wherein the nitrogen tank 601 is connected to the bidirectional vacuum pump 602, the bidirectional vacuum pump 602 is connected to the carbon molecular sieve adsorption column 603, the third solenoid valve 604 is installed on the pipeline connected between the bidirectional vacuum pump 602 and the carbon molecular sieve adsorption column 603, the carbon molecular sieve adsorption column 603 is connected to the nitrogen delivery main pipe 605, the nitrogen delivery main pipe 605 is connected to the first nitrogen delivery sub-pipe 606 and the second nitrogen delivery sub-pipe 607, the first nitrogen delivery sub-pipe 606 and the second nitrogen delivery sub-pipe 607 are both connected to the carriage 2, and the fourth solenoid valve 608 and the fifth solenoid valve 609 are respectively installed on the first nitrogen delivery sub-pipe 606 and the second nitrogen delivery sub-pipe 607; The nitrogen delivery assembly 16 includes a delivery pipe 1601, an exhaust pipe 1602, a nozzle 1603, a sixth solenoid valve 1604, a delivery branch pipe 1605 and a seventh solenoid valve 1606. One end of the delivery pipe 1601 is connected to the second baffle 11, and the other end of the delivery pipe 1601 is equipped with an exhaust pipe 1602, and a plurality of nozzles 1603 are obliquely arranged on the exhaust pipe 1602. The sixth solenoid valve 1604 is installed at the connection between the exhaust pipe 1602 and the delivery pipe 1601, and the delivery branch pipe 1605 is installed at the bottom of the delivery pipe 1601. The seventh solenoid valve 1606 is installed on the delivery branch pipe 1605; The emptying assembly 17 includes a fixed partition 1701, a folding airbag 1702, a bottom box 1703 and a slide 1704. The fixed partition 1701 is installed at the top of the interior of the carriage 2. The bottom of the fixed partition 1701 is adhered with the folding airbag 1702, and the bottom of the delivery branch pipe 1605 enters the folding airbag 1702 through the fixed partition 1701. The bottom of the folding airbag 1702 is fixed with a bottom box 1703, and a plurality of slides 1704 are provided on both sides of the bottom box 1703. A temperature sensor 14 and a pressure sensor 15 are installed on each of the second partitions 11, and a plurality of guide rails 18 are installed on the inner wall of the carriage 2 and the third partition 13. Each of the bottom boxes 1703 slides with the corresponding guide rails 18 through the slide grooves 1704 opened on both sides.

[0033] A plurality of tension springs are arranged in the folding airbag 1702 , the top of each tension spring is connected to the fixed partition 1701 , and the bottom of each tension spring is connected to the bottom box 1703 .

[0034] The exhaust mechanism 12 includes a one-way vacuum pump 1201, an air suction main pipe 1202, a first air suction sub-pipe 1203, a second air suction sub-pipe 1204, a first solenoid valve 1205, a second solenoid valve 1206 and an exhaust pipe 1207. The output end of the one-way vacuum pump 1201 is connected to the exhaust pipe 1207, the input end of the one-way vacuum pump 1201 is connected to the air suction main pipe 1202, the air suction main pipe 1202 is connected to the first air suction sub-pipe 1203 and the second air suction sub-pipe 1204, the first solenoid valve 1205 and the second solenoid valve 1206 are respectively installed on the first air suction sub-pipe 1203 and the second air suction sub-pipe 1204.

[0035] The opening and closing assembly 7 includes an electric push rod 701 , a sealing plate 702 and an airbag ring 703 . The sealing plate 702 is installed at the telescopic end of the electric push rod 701 , and the airbag ring 703 is fixed at the edge of the sealing plate 702 .

[0036] A third partition 13 is provided inside the carriage 2, and the third partition 13 divides the carriage 2 into two storage rooms. The front end of each storage room is separated by a ventilation room through the second partition 11, and the top of each ventilation room is separated by a cold air room through the first partition 9.

[0037] The first nitrogen delivery sub-pipe 606, the second nitrogen delivery sub-pipe 607, the first air intake sub-pipe 1203 and the second air intake sub-pipe 1204 are respectively connected to corresponding ventilation chambers, each of the delivery pipes 1601 is respectively connected to a corresponding cold air chamber, and the evaporator 8 is arranged in two cold air chambers.

[0038] A sealing groove is provided on the side of the exhaust window 19 facing the ventilation chamber, an annular groove is provided in the sealing groove, the sealing plate 702 is plug-fitted with the sealing groove, and the airbag ring 703 is extruded and fitted with the annular groove.

[0039] Each of the ventilation chambers is equipped with an intelligent vacuum safety valve.

[0040] The working principle of the present invention is as follows: after the fresh agricultural products are loaded into the carriage 2, the door 3 is closed, the carriage 2 is sealed, the exhaust mechanism 12 is operated to exhaust the air in the carriage 2, and the pressure sensor 15 in the carriage 2 is used to detect the air pressure in the carriage 2 in real time, so that the interior of the carriage 2 is in a negative pressure close to a vacuum state, and then the two opening and closing components 7 are operated to close the exhaust window 19, the exhaust mechanism 12 is stopped, and the pressure sensor 15 continuously detects the air pressure state in the carriage 2 at this time. If the pressure sensor 15 detects that the air pressure slowly increases, it means that the air tightness of the carriage 2 is not strict, so as to remind the driver to observe whether the door 3 is closed tightly, so as to avoid the outside air from entering the carriage 2 during transportation, causing the fresh agricultural products to breathe and the heat preservation to deteriorate. The quality of fresh agricultural products is affected. When the pressure sensor 15 detects that the air pressure remains unchanged, it means that the sealing is better. Then, the compressor 4, the condenser 5 and the evaporator 8 start to work for refrigeration. During the refrigeration process, due to the negative pressure in the compartment 2, the air is thin, resulting in poor fluidity of the cold air. Therefore, at this time, the nitrogen supply mechanism 6 and the fan 10 operate synchronously. The nitrogen supply mechanism 6 transports the nitrogen into the ventilation room, and then enters the cold air room through the fan 10. During the process of the nitrogen entering the cold air room, the fan 10 disperses the nitrogen so that the nitrogen can fully contact with the evaporator 8, thereby cooling the nitrogen. The cooled nitrogen first enters the emptying component 17 through the nitrogen delivery component 16, causing the folded airbag 1702 to expand, thereby cooling the remaining space in the storage room. When the infrared sensor 20 at the bottom detects that the fresh agricultural products discharged below are about 10 cm away, the nitrogen flushing in the folded airbag 1702 is stopped to prevent the bottom box 1703 from crushing the fresh agricultural products. Then the nozzle 1603 is opened to discharge the cooled nitrogen into the remaining space of the storage chamber, which is conducive to reducing the nitrogen flow space and reducing the nitrogen usage. At the same time, the cooled nitrogen can quickly cool the fresh agricultural products and improve the timeliness of preservation. When the nitrogen is filled into the storage chamber, the pressure sensor 15 detects the air pressure in the storage chamber in real time, so as to adjust the negative pressure. After the air pressure returns to the normal pressure state, the nitrogen supply mechanism 6 stops supplying nitrogen, and the opening and closing component 7 opens the exhaust window 19, so that the internal nitrogen is discharged under the action of the fan 10. The air in the compartment 16 is cooled by the evaporator 8 and then sprayed into the compartment from the nozzle 1603 at the other end of the nitrogen supply component 16 to form a cold cycle. During the cold cycle, the temperature sensor 14 monitors the temperature in the compartment. When the temperature drops to the set value, the cooling is stopped to save energy consumption. Nitrogen is used instead of air as the flow medium, so that the cold air generated by the evaporator 8 can be quickly and evenly diffused into the compartment 2, thereby improving the cooling efficiency, avoiding oxidation and deterioration of fresh agricultural products, and ensuring that fresh agricultural products are stored and transported at normal pressure and specified temperature, thereby improving the preservation effect. After the internal air is discharged and the internal pressure is negative, nitrogen is filled to ensure that the fresh agricultural products are under normal pressure and avoid negative pressure.The internal pressure of fresh agricultural products is greater than the pressure in the storage room, which causes water seepage or skin breakage on the surface of fresh agricultural products, thereby improving the water lock performance of fresh agricultural products and also improving the quality of preservation.

[0041] When the refrigerated truck transports fresh agricultural products to an unloading point but does not completely unload the goods, before unloading, the nitrogen supply mechanism 6 is operated to draw back the nitrogen in the storage room. During the drawing back process, oxygen is automatically filtered out to ensure the cleanliness of the recovered nitrogen for easy recycling. The nitrogen stored in the folding airbag 1702 remains unchanged, and the pressure sensor 15 is used to detect the air pressure in the compartment 2. When the air pressure in the storage room is reduced to the pressure before the nitrogen supply, it means that the nitrogen has been recovered. The intelligent vacuum safety valve opens to allow air to enter the storage room, balancing the pressure inside and outside the compartment 2, thereby facilitating the opening of the compartment door 3 for unloading. After unloading, , after closing the compartment door 3, the storage chamber is sealed, and then the exhaust mechanism 12 exhausts the air again, so that the air pressure in the storage chamber returns to the set value again. Because the folding airbag 1702 is in an expanded state during the unloading process, the amount of air entering the storage chamber during unloading is much smaller than the amount of air before loading, thereby improving the exhaust efficiency after unloading. At the same time, the folding airbag 1702 stores low-temperature nitrogen, which can pre-cool the air that enters again, thereby reducing the temperature change inside the storage chamber after unloading, which is beneficial to improving the refrigeration efficiency during re-transportation, and at the same time, saving energy consumption and reducing transportation costs.

[0042] Specifically, the pressure threshold value in the monitoring storage room set by the pressure sensor 15 is the pressure value when the negative pressure inside the storage room reaches 20% for multiple monitorings, so that the oxygen concentration in the storage room can be kept at about 3-5%, thereby avoiding too low oxygen concentration, which may cause hypoxia damage to fruits and vegetables. At the same time, in order to further accurately measure the oxygen concentration, an oxygen sensor can be installed on one side of the pressure sensor 15. Through the cooperation of the pressure sensor 15 and the oxygen sensor, when the pressure sensor 15 detects that the storage room has reached the set pressure value, and the oxygen sensor detects that the oxygen concentration is lower than 5%, the air is stopped from being discharged, ensuring that the storage room is in a negative pressure state. While there is only a small amount of oxygen, it can ensure that the oxygen is within a certain concentration range, which can not only avoid hypoxia damage, but also avoid anaerobic respiration of fruits and vegetables leading to the accumulation of harmful substances such as alcohol, accelerate the deterioration of fruits and vegetables, and affect their quality and shelf life. Therefore, by reserving a certain amount of oxygen, it is possible to ensure that fruits and vegetables can perform normal aerobic respiration, maintain their basic physiological metabolism, reduce the negative impact of anaerobic respiration, and further extend the shelf life.

[0043] When the exhaust mechanism 12 cooperates with the pressure sensor 15 and the opening and closing component 7 to work, the one-way vacuum pump 1201 is operated, the first solenoid valve 1205 and the second solenoid valve 1206 are opened at the same time, and the air is evacuated from the two storage chambers inside the car 2 through the first suction sub-pipe 1203 and the second suction sub-pipe 1204, so that the air enters the suction main pipe 1202 and is discharged from the discharge pipe 1207. The pressure sensors 15 in the two storage chambers monitor the internal air pressure in real time. When the negative pressure setting value is reached, each electric push rod 701 runs and extends, the sealing plate 702 is inserted into the sealing groove, and the airbag ring 703 is squeezed into the annular groove, thereby sealing each exhaust window 19, improving the sealing, and making the two storage chambers in a sealed state. The two pressure sensors 15 continue to Continue to detect the stability of the air pressure in the storage room to avoid air leakage due to the door 3 not closing tightly. While the pressure sensor 15 detects whether the door 3 has air leakage, continue to vacuum the cold air room and the ventilation room to reduce the air surplus. After detecting that the air pressure in the storage room is stable, the first solenoid valve 1205 and the second solenoid valve 1206 close the first suction sub-pipe 1203 and the second suction sub-pipe 1204 respectively to avoid air backflow. As the one-way vacuum pump 1201 stops running and a single storage room is negatively exhausted, it is only necessary to open the corresponding solenoid valve to achieve separate management of the two storage rooms, improve the convenience of unloading, and avoid leakage in another storage room when unloading fresh agricultural products in a single storage room.

[0044] When the nitrogen supply mechanism 6, the fan 10, the nitrogen delivery component 16, the emptying component 17 and the infrared sensor 20 cooperate to work, when the nitrogen in the nitrogen tank 601 is extracted by the two-way vacuum pump 602, the third solenoid valve 604, the fourth solenoid valve 608, the fifth solenoid valve 609 and the seventh solenoid valve 1606 are opened, and the sixth solenoid valve 1604 is in a closed state, so that the nitrogen enters the corresponding ventilation room from the first nitrogen delivery sub-pipe 606 and the second nitrogen delivery sub-pipe 607 respectively, and then enters the cold air room from the ventilation room. When entering the cold air room, the fan 10 has a stirring effect on the nitrogen passing through, increases the diffusion area of ​​the nitrogen, so that the nitrogen can fully contact with the evaporator 8 for cooling. The cooled nitrogen enters the delivery pipe 1601, and then enters the folded airbag 1702 from the delivery branch pipe 1605, so that the folded airbag 1702 expands. During the expansion process, the internal The tension spring is extended, and the bottom box 1703 at the bottom descends along the guide rail 18. During the descent process, the infrared sensor 20 detects the distance between the bottom box 1703 and the fresh agricultural products stored in the storage chamber in real time. When it is detected that the distance reaches the set value, the sixth solenoid valve 1604 is closed to stop the expansion of the folding airbag 1702. By expanding the folding airbag 1702 in the storage chamber, the remaining space in the storage chamber can be reduced, thereby reducing the amount of nitrogen that will be discharged into the storage chamber later, saving the use of nitrogen, and allowing the nitrogen to quickly fill the remaining space, so that the nitrogen can quickly cool the fresh agricultural products and keep them fresh, thereby improving the timeliness of preservation, and allowing the storage chamber to maintain normal pressure, thereby preventing the fresh agricultural products from being in a negative pressure space for a long time, causing water analysis inside the fresh agricultural products and even skin breakage, thereby ensuring the integrity of the fresh agricultural products and improving the preservation quality; As the seventh solenoid valve 1606 opens, the transported nitrogen is discharged from each nozzle 1603 into the interior of the storage chamber, the nitrogen flows downward from the top near the door 3, and then enters the bottom of the folded airbag 1702 to cool the stored fresh agricultural products, and finally flows to the exhaust window 19. The pressure sensor 15 detects the air pressure of the storage chamber when it is filled with nitrogen. After the storage chamber is at normal pressure, the bidirectional vacuum pump 602 stops supplying nitrogen, the fourth solenoid valve 608 and the fifth solenoid valve 609 are closed, and as the sealing plate 702 is removed from the sealing groove, the exhaust window 19 is opened, thereby cooperating with the fan 10 to form a circulating cooling channel, so that the nitrogen circulates to cool down from the evaporator 8, and under the detection of the temperature sensor 14, the storage chamber reaches the set temperature value.

[0045] When the nitrogen supply mechanism 6, the pressure sensor 15, and the intelligent vacuum safety valve cooperate to work, the bidirectional vacuum pump 602 draws back the nitrogen in the corresponding storage chamber. During the drawing back, the carbon molecular sieve adsorption column 603 adsorbs the oxygen entrained in the drawn back nitrogen, so that only the nitrogen can be recovered into the nitrogen tank 601, and the purity of the recovered nitrogen is maintained, which is conducive to recycling. During the recycling process, when the pressure sensor 15 detects that the air pressure in the storage chamber has returned to the set value of the negative pressure state, the nitrogen filled in the storage chamber has been recovered, and the intelligent vacuum safety valve is opened, allowing the outside air to enter the compartment 2. The air entering the compartment 2 is discharged by the folding airbag 1702. The retained nitrogen is used for pre-cooling to reduce the temperature difference and improve the refrigeration effect on fresh agricultural products. After the air pressure in the compartment 2 is at normal pressure, the intelligent vacuum safety valve is closed and the door 3 is opened to improve the convenience of opening the door 3 and avoid the air pressure inside the compartment 2 being too low, which makes the door 3 difficult to open. After the door 3 is opened, the goods in the storage room can be incompletely unloaded. After the fixed-point goods are unloaded, the door 3 is closed, and then the air entering the interior is discharged. After the storage room reaches a certain negative pressure, nitrogen is flushed as a medium to flow in the storage room to avoid the cold air generated by the evaporator 8 under negative pressure. Difficult to diffuse, thereby improving the refrigeration effect on fresh agricultural products.

[0046] When all the fresh agricultural products in the refrigerated truck are unloaded, the two-way vacuum pump 602 is running, the third solenoid valve 604, the fourth solenoid valve 608, the fifth solenoid valve 609 and the seventh solenoid valve 1606 are all opened, and the nitrogen is filtered through the carbon molecular sieve adsorption column 603 and then recovered into the nitrogen tank 601, and the tension spring in the folding airbag 1702 contracts to discharge the nitrogen in the folding airbag 1702 until the pressure sensor 15 detects that the air pressure in the compartment 2 reaches the set value of the negative pressure state, and it is determined that the nitrogen recovery is completed, the third solenoid valve 604 is closed, the two-way vacuum pump 602 stops running, and the intelligent vacuum safety valve is opened, so that the air pressure inside and outside the compartment 2 is equal, so that the air pressure in the carbon molecular sieve adsorption column 603 increases, and the adsorbed oxygen is released, so that the carbon molecular sieve adsorption column 603 can also be recycled to avoid the internal oxygen absorption reaching saturation, and the compartment door 3 can be opened to unload, realize the recycling of nitrogen, reduce transportation costs, and improve the refrigeration effect.

[0047] Finally, a few points should be explained: First, in the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, and can be mechanical or electrical connections, or internal connectivity between two components, or direct connections. "Up", "down", "left" and "right" are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may change; secondly: in the drawings of the embodiments disclosed in the present invention, only the structures involved in the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0048] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional refrigerated vehicle with negative pressure regulation, comprising a vehicle body (1), wherein the vehicle body (1) is connected to a program control unit, wherein the program control unit comprises a software control system and a hardware drive unit, wherein the hardware drive unit is controlled by the software control system to operate, and wherein: A carriage (2) is mounted on the vehicle body (1), a door (3) is mounted on the carriage (2), a compressor (4) is mounted on the front side of the outside of the carriage (2), a nitrogen supply mechanism (6) connected to the carriage (2) is disposed on one side of the compressor (4), an exhaust mechanism (12) connected to the carriage (2) is disposed on one side of the nitrogen supply mechanism (6), a condenser (5) connected to the compressor (4) is mounted on the top of the front end of the carriage (2), the condenser (5) is connected to an evaporator (8), the evaporator (8) is mounted on the front end of the inside of the carriage (2), and the inside of the carriage (2) is provided with a nitrogen supply mechanism (6) connected to the carriage (2). A third partition (13) is provided in the middle, first partitions (9) at the bottom of the evaporator (8) are provided on both sides of the third partition (13), a fan (10) is installed on each of the first partitions (9), a second partition (11) is provided on one side of each of the first partitions (9), a nitrogen supply component (16) is connected to the top of each of the second partitions (11), an exhaust component (17) is installed at the bottom of each of the nitrogen supply components (16), a plurality of infrared sensors (20) are installed at the bottom of each of the exhaust components (17), and an exhaust window is provided on each of the second partitions (11). (19), each of the exhaust windows (19) is connected to an opening and closing assembly (7); the nitrogen supply mechanism (6) comprises a nitrogen tank (601), a bidirectional vacuum pump (602), a carbon molecular sieve adsorption column (603), a third solenoid valve (604), a nitrogen delivery main pipe (605), a first nitrogen delivery auxiliary pipe (606), a second nitrogen delivery auxiliary pipe (607), a fourth solenoid valve (608) and a fifth solenoid valve (609), the nitrogen tank (601) is connected to a bidirectional vacuum pump (602), the bidirectional vacuum pump (602) is connected to a carbon molecular sieve adsorption column (603), the first solenoid valve (604) is connected to a second solenoid valve (605), and the second solenoid valve (606) is connected to a second solenoid valve (607). The three solenoid valves (604) are installed on the pipeline connecting the bidirectional vacuum pump (602) and the carbon molecular sieve adsorption column (603); the carbon molecular sieve adsorption column (603) is connected to a nitrogen delivery main pipe (605); the nitrogen delivery main pipe (605) is connected to a first nitrogen delivery sub-pipe (606) and a second nitrogen delivery sub-pipe (607); the first nitrogen delivery sub-pipe (606) and the second nitrogen delivery sub-pipe (607) are both connected to the carriage (2); and the fourth solenoid valve (608) and the fifth solenoid valve (609) are installed on the first nitrogen delivery sub-pipe (606) and the second nitrogen delivery sub-pipe (607), respectively;The nitrogen delivery component (16) comprises a delivery pipe (1601), an exhaust pipe (1602), a nozzle (1603), a sixth solenoid valve (1604), a delivery branch pipe (1605) and a seventh solenoid valve (1606); one end of the delivery pipe (1601) is connected to the second partition plate (11); the other end of the delivery pipe (1601) is provided with an exhaust pipe (1602); a plurality of nozzles (1603) are obliquely arranged on the exhaust pipe (1602); a sixth solenoid valve (1604) is installed at the connection between the exhaust pipe (1602) and the delivery pipe (1601); a delivery branch pipe (1605) is installed at the bottom end of the delivery pipe (1601); and a seventh solenoid valve (1606) is installed on the delivery branch pipe (1605); the emptying component (17) comprises a fixed partition plate (1701), a foldable air bag (1702), a bottom box (1703) and a slide groove (1704), the fixed partition (1701) is installed at the top of the interior of the carriage (2), the bottom end of the fixed partition (1701) is adhered with a folding airbag (1702), and the bottom end of the delivery branch pipe (1605) enters the folding airbag (1702) through the fixed partition (1701), the bottom end of the folding airbag (1702) is fixed with a bottom box (1703), and a plurality of slide grooves (1704) are provided on both sides of the bottom box (1703); a temperature sensor (14) and a pressure sensor (15) are installed on each of the second partitions (11), a plurality of guide rails (18) are installed on the inner wall of the carriage (2) and the third partition (13), and each of the bottom boxes (1703) is slidably matched with the corresponding guide rails (18) through the slide grooves (1704) provided on both sides. ; 2. A multifunctional refrigerated vehicle with negative pressure regulation according to claim 1, characterized in that: A plurality of tension springs are arranged in the folding airbag (1702), the top of each tension spring is connected to the fixed partition (1701), and the bottom of each tension spring is connected to the bottom box (1703).

3. A multifunctional refrigerated vehicle with negative pressure regulation according to claim 2, characterized in that: The exhaust mechanism (12) comprises a one-way vacuum pump (1201), an air suction main pipe (1202), a first air suction sub-pipe (1203), a second air suction sub-pipe (1204), a first solenoid valve (1205), a second solenoid valve (1206) and a discharge pipe (1207); the output end of the one-way vacuum pump (1201) is connected to the discharge pipe (1207); the input end of the one-way vacuum pump (1201) is connected to the air suction main pipe (1202); the air suction main pipe (1202) is connected to the first air suction sub-pipe (1203) and the second air suction sub-pipe (1204); and the first solenoid valve (1205) and the second solenoid valve (1206) are respectively mounted on the first air suction sub-pipe (1203) and the second air suction sub-pipe (1204).

4. A multifunctional refrigerated vehicle with negative pressure regulation according to claim 3, characterized in that: The opening and closing assembly (7) comprises an electric push rod (701), a sealing plate (702) and an airbag ring (703); the sealing plate (702) is installed at the telescopic end of the electric push rod (701), and the airbag ring (703) is fixed to the edge of the sealing plate (702).

5. A multifunctional refrigerated vehicle with negative pressure regulation according to claim 4, characterized in that: A third partition (13) is provided inside the carriage (2), and the third partition (13) divides the carriage (2) into two storage rooms. A ventilation room is separated at the front end of each storage room by a second partition (11), and a cold air room is separated at the top of each ventilation room by a first partition (9).

6. A multifunctional refrigerated vehicle with negative pressure regulation according to claim 5, characterized in that: The first nitrogen delivery auxiliary pipe (606), the second nitrogen delivery auxiliary pipe (607), the first air intake auxiliary pipe (1203) and the second air intake auxiliary pipe (1204) are respectively connected to corresponding ventilation chambers, each of the delivery pipes (1601) is respectively connected to a corresponding cold air chamber, and the evaporator (8) is arranged in two cold air chambers.

7. A multifunctional refrigerated vehicle with negative pressure regulation according to claim 6, characterized in that: A sealing groove is provided on the side of the exhaust window (19) facing the ventilation chamber, an annular groove is provided in the sealing groove, the sealing plate (702) is plug-fitted with the sealing groove, and the airbag ring (703) is extruded and fitted with the annular groove.

8. The multifunctional refrigerated vehicle with negative pressure regulation according to claim 7, characterized in that: Each of the ventilation chambers is equipped with an intelligent vacuum safety valve.

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