Dynamic negative-pressure rapid pre-cooling device

Abstract

The invention relates to a dynamic negative-pressure rapid pre-cooling device which comprises a pressure-bearing sealing box body, a pressure-bearing sealing door is hinged to the side edge of the pressure-bearing sealing box body, an equipment cabin is arranged behind the pressure-bearing sealing box body, and the equipment cabin is provided with a refrigerating unit, a filter box, a vacuum pump and a power distribution control cabinet. The invention relates to the technical field of rapid precooling of fresh agricultural products. According to the dynamic negative-pressure rapid pre-cooling device, a low-pressure environment is created in the pressure-bearing sealed box body, the interior of a fruit core reaches low pressure, a huge negative-pressure condition with heat exchange potential is created in a fruit, cold air rapidly enters the interior of the fruit through tiny holes among fruit tissues under the potential energy of the negative pressure, and the fruit is rapidly pre-cooled. And sufficient heat exchange is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of rapid precooling of fresh agricultural products, and specifically to equipment widely applicable to rapid precooling and cooling of fresh agricultural products such as fruits and vegetables, edible mushrooms, aquatic products, and meat, and in particular to a dynamic negative pressure rapid precooling device which has significant technical advantages in rapidly reducing the core temperature of fruits with dense epidermal tissue. Background Art

[0002] Rapid pre-cooling of fruits and vegetables after harvesting quickly removes field heat and reduces the respiration intensity of fruits and vegetables, which plays a very important role in maintaining the quality of fruits and vegetables after harvesting and preserving them in subsequent storage and circulation. Rapid pre-cooling of fruits and vegetables after harvesting is the first and most critical step in preserving freshness.

[0003] The existing precooling methods are: ice water precooling, long-term cooling in a low-temperature cold storage, vacuum precooling and differential pressure precooling. These precooling methods have their own advantages, but they are not effective in quickly reducing the core temperature of fruits with dense skin tissues. The cooling time of the fruit core is generally more than 4 hours, and the time to cool down the fruit core in a low-temperature cold storage is even more than 12 hours. In the application field of quickly reducing the core temperature of fruits, low precooling efficiency, long time and high energy consumption are common problems of the above-mentioned traditional precooling methods, which also restricts the application of these technologies in the field of fruit precooling.

[0004] Compared with the passive cooling of ordinary cold storage and the inefficient cooling of positive pressure by differential pressure precooling, an innovative technology is urgently needed to achieve rapid precooling of the fruit core. The present invention uses the logic of active low-pressure recovery to quickly reduce the temperature of the fruit core. The cooling efficiency is very high. The energy consumption required is only that of ordinary cold storage, but the cooling efficiency is 10 times that of ordinary cold storage, 4 times that of differential pressure precooling, or even higher. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a dynamic negative pressure rapid precooling device to solve the above-mentioned problems.

[0006] To achieve the above purpose, the present invention is implemented through the following technical solutions: a dynamic negative pressure rapid precooling device includes a pressure-bearing sealed box, a pressure-bearing sealed door is hinged on the side of the pressure-bearing sealed box, an equipment cabin is arranged at the rear of the pressure-bearing sealed box, and the equipment cabin is equipped with a refrigeration unit, a filter box, a vacuum pump and a power distribution control cabinet, the internal machine cooling fan of the refrigeration unit is arranged in the inner cavity of the pressure-bearing sealed box, and the inner cavity of the pressure-bearing sealed box is equipped with a cabin temperature probe, a fruit core temperature monitoring probe and a pressure probe, one side of the pressure-bearing sealed box is fixedly connected to a transfer cabin, the top of the pressure-bearing sealed box is provided with an air intake valve, one end of the air intake valve is connected to the filter box, and the transfer cabin is connected to the vacuum pump and the filter box respectively;

[0007] The inner cavity of the pressure-bearing sealed box body is separated by side ventilation cabins on both sides through side filter plates, and the bottom of the pressure-bearing sealed box body is separated by a bottom ventilation cabin through a bottom filter plate. The side ventilation cabin and the bottom ventilation cabin are both connected to the transfer cabin through pipelines. The two side filter plates, the bottom filter plate and the partition plate separate a placement cabin for placing fruits and vegetables. The inner cavities of the side filter plates and the bottom filter plates are each provided with a plurality of ventilation ports connected to the placement cabin.

[0008] The inner cavity of the bottom ventilation cabin is rotatably connected with a connecting piece through an embedded groove, and the side of the connecting piece is slidably connected with a guide cylinder, the surface of the guide cylinder is sleeved with a buffer ring, and the surface of the buffer ring is provided with a plurality of empty grooves, and the surface of the guide cylinder below the empty groove is provided with air holes, and the air holes are connected with the transfer cabin through an air pipe connected to the end of the guide cylinder, and a fruit core temperature monitoring probe is fixedly connected to the top of the guide cylinder, and the inner cavity of the bottom ventilation cabin is provided with a positioning mechanism for positioning the guide cylinder, and when in use, fruits and vegetables that need to be quickly pre-cooled are placed in the pressure-bearing sealed box. In the storage compartment, fruits and vegetables are placed in plastic turnover baskets with holes or cartons with holes, stacked neatly, and a space of 20 cm is reserved from the top surface of the box body for the convenience of cold air circulation. The storage compartment in the back half is filled first. After filling, the guide cylinder is rotated clockwise for 90 degrees to set it vertically. At this time, the fruit core temperature monitoring probe above the guide cylinder is inside the stacked vegetable basket, and plays an effective buffering role through the buffer ring, and then the pressure-bearing sealing door is closed; set the target temperature for fruit and vegetable precooling on the LCD touch screen of the control cabinet, and click the start button on the LCD screen after the parameter setting is completed;The refrigeration unit, air cooler and vacuum pump start working at the same time to cool and reduce the air pressure inside the pressurized sealed box. At this time, through the setting of the transfer cabin, the air holes on the side ventilation cabin, the bottom ventilation cabin and the surface of the guide tube simultaneously inhale air, quickly extract the hot gas inside, and quickly reach a negative pressure state. The cabin temperature probe monitors the ambient temperature in the box in real time. The refrigeration temperature is reduced to the preset ambient temperature. The pressure monitoring probe continuously monitors the reduction of the ambient air pressure in the box. The internal air pressure gradually decreases to 10-30kPa. At this time, the vacuum pump stops working, and then the air intake valve is opened to slowly introduce outside air. At this time, the box is in a negative pressure state. The gas is input from the air intake valve, filtered by the filter box, and then input into the side ventilation cabin, the bottom ventilation cabin and the air holes on the surface of the guide tube in the transfer cabin. The air pressure inside the box slowly increases within 30 to 80 minutes. The fruit core temperature monitoring probe continuously monitors the rapid drop in temperature until the fruit core temperature reaches the target temperature. The equipment automatically stops running and the pressure inside the pressurized sealed box recovers to 1 standard atmosphere The pressure inside and outside the pressure-bearing sealed door is balanced, and the LCD touch screen on the control cabinet shows that the door can be opened. The pre-cooling operation is completed. Using the logic of dynamic low-pressure recovery, the warm gas in the fruit core is first quickly extracted through the tiny pores between the fruit tissues to form an extremely low air pressure inside the fruit core. Then, the pressure inside and outside the fruit tends to be balanced under the same environment, and the ambient air pressure in the box is gradually and slowly increased. During this period, the refrigeration fan in the pressure-bearing sealed box continues to cool, and the pressure difference between the ambient air pressure in the box and the internal air pressure of the fruit is used to introduce a large amount of cold air in the box environment into the fruit, and a wide and deep heat exchange is carried out to achieve the effect of quickly reducing the temperature of the fruit core. In addition, when extracting and inletting air, the side ventilation cabin, the bottom ventilation cabin and the air holes on the surface of the guide cylinder can quickly and evenly exchange air to ensure the changes in the overall temperature and air pressure levels. The central position of the guide cylinder can effectively adjust the internal air pressure, and it can be conveniently folded and raised for use when needed. ;

[0009] As a further solution of the present invention: when the connecting member is rotated to a vertical state with the bottom filter plate, the surface of the embedded groove is placed on the cover plate, and the exposed embedded groove is covered by the cover plate to prevent fruits and vegetables from falling into the bottom ventilation chamber below.

[0010] As a further solution of the present invention: the inner cavities of the bottom ventilation cabin and the side ventilation cabin are both provided with reinforcing ribs, and the compression resistance is enhanced by the reinforcing ribs.

[0011] As a further solution of the present invention: the side of the connecting piece is fixedly connected to a limiting block, and the inner cavity of the guide cylinder is provided with a limiting groove which is slidably connected to the limiting block. Through the setting of the limiting groove and the limiting block, it can be ensured that the guide cylinder can play a role of length limitation while being slidably set above the connecting piece.

[0012] As a further solution of the present invention: the positioning mechanism includes a receiving plate fixed in the inner cavity of the embedded groove, the inner cavity of the receiving plate is provided with an inner groove, the inner cavity of the inner groove is fixedly connected with a reset spring, the top of the reset spring is fixedly connected with a plug-in rod, the bottom of the guide cylinder is provided with a plug-in groove plugged with the plug-in rod, when the guide cylinder is rotated ninety degrees clockwise, the bottom fits with the top of the receiving plate, and the guide cylinder is supported by the receiving plate, and when the guide cylinder is rotated ninety degrees clockwise, the plug-in rod is plugged into the plug-in groove of the inner cavity of the guide cylinder to position the guide cylinder, and then when it is necessary to cancel the positioning, just pull the guide cylinder upwards and pull it out from the connecting piece to cancel the positioning with the plug-in rod, and the guide cylinder can be rotated counterclockwise to reset it.

[0013] As a further solution of the present invention: a filter net is built into the inner cavity of the filter box. Through the setting of the filter net, the air entering from the air inlet valve is filtered, and then input into the transfer cabin to increase the pressure in the cabin. The air drawn out by the vacuum pump is drawn into the transfer cabin and then filtered through the filter net and transported to the vacuum pump, thereby protecting the vacuum pump. One filter box can realize the filtering function of air intake and air outlet, saving equipment costs.

[0014] As a further solution of the present invention: a heat-insulating layer is provided on the side of the pressure-bearing sealed box body, and the internal storage compartment is insulated by the heat-insulating layer to prevent temperature fluctuations.

[0015] As a further solution of the present invention: when the pressure-bearing sealed box is refrigerating, the air pressure inside the pressure-bearing sealed box is reduced to 10-30kPa. After reaching the set air pressure, the air pressure inside the box is increased to 1 standard atmospheric pressure within 30 to 80 minutes, and the cooling fan in the pressure-bearing sealed box continues to refrigerate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention utilizes the logic of dynamic low-pressure recovery, firstly, the warm gas in the fruit core is quickly extracted through the tiny pores between the fruit tissues, forming an extremely low air pressure inside the fruit core, and then the ambient air pressure in the box is gradually and slowly increased in a manner that the pressure inside and outside the fruit tends to be balanced under the same environment. During this period, the refrigeration fan in the pressure-bearing sealed box continues to cool, and a large amount of cold air in the environment inside the box is introduced into the fruit by utilizing the pressure difference between the ambient air pressure in the box and the air pressure inside the fruit, so as to carry out extensive and intensive heat exchange and achieve the effect of quickly reducing the temperature of the fruit core. In addition, when extracting and inletting air, the air holes on the side ventilation cabin, the bottom ventilation cabin and the surface of the guide cylinder are arranged, so that the air exchange can be carried out quickly and evenly to ensure the changes in the overall temperature and air pressure levels.

[0018] 2. The present invention creates a low-pressure environment inside the pressure-bearing sealed box, reaches a lower pressure inside the fruit core, and creates a huge negative pressure condition with heat exchange potential inside the fruit. Under the potential energy of negative pressure, cold air quickly enters the fruit through the tiny pores between the fruit tissues, thereby achieving sufficient heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the raised state of the guide cylinder of the present invention;

[0021] Figure 3 For the present invention Figure 1 A partial enlarged view of the middle A;

[0022] Figure 4 For the present invention Figure 2 A partial enlarged view of point B in the middle;

[0023] Figure 5 It is a structural side view of the present invention.

[0024] In the figure: 1. Pressure-bearing sealed box; 2. Bottom filter plate; 4. Transfer cabin; 5. Side filter plate; 6. Side ventilation cabin; 7. Bottom ventilation cabin; 8. Filter box; 9. Inlet valve; 10. Vacuum pump; 11. Filter screen; 12. Refrigeration unit; 13. Pressure-bearing sealed door; 14. Connector; 15. Guide cylinder; 16. Buffer ring; 17. Empty groove; 18. Air hole; 19. Air pipe; 20. Limit groove; 21. Limit block; 22. Reset spring; 23. Plug rod; 24. Adapter plate; 25. Plug slot; 26. Fruit core temperature monitoring probe; 27. Power distribution cabinet control cabinet. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0026] See also Figure 1-5The present invention provides a technical solution: a dynamic negative pressure rapid precooling device, comprising a pressure-bearing sealed box 1, a pressure-bearing sealed door 13 is hinged on the side of the pressure-bearing sealed box 1, an equipment cabin is arranged at the rear of the pressure-bearing sealed box 1, and the equipment cabin is equipped with a refrigeration unit 12, a filter box 8, a vacuum pump 10 and a power distribution control cabinet 27, an internal machine cooling fan 28 of the refrigeration unit 12 is arranged in the inner cavity of the pressure-bearing sealed box 1, and a cabin temperature probe, a fruit core temperature monitoring probe 26 and a pressure probe are built in the inner cavity of the pressure-bearing sealed box 1, a transfer cabin 4 is fixedly connected to one side of the pressure-bearing sealed box 1, an air intake valve 9 is arranged on the top of the pressure-bearing sealed box 1, one end of the air intake valve 9 is connected to the filter box 8, and the transfer cabin 4 is respectively connected to the vacuum pump 10 and the filter box 8;

[0027] The inner cavity of the pressure-bearing sealed box body 1 is separated by side ventilation cabins 6 on both sides through side filter plates 5, and the bottom of the pressure-bearing sealed box body 1 is separated by a bottom ventilation cabin 7 through a bottom filter plate 2. The side ventilation cabin 6 and the bottom ventilation cabin 7 are both connected to the transfer cabin 4 through pipelines. The two side filter plates 5, the bottom filter plate 2 and the partition plate 3 separate a placement cabin for placing fruits and vegetables. The inner cavities of the side filter plates 5 and the bottom filter plate 2 are both provided with a plurality of ventilation ports connected to the placement cabins.

[0028] The inner cavity of the bottom ventilation cabin 7 is rotatably connected with a connector 14 through an embedded groove, and the side of the connector 14 is slidably connected with a guide cylinder 15, and a buffer ring 16 is sleeved on the surface of the guide cylinder 15, and a plurality of empty grooves 17 are provided on the surface of the buffer ring 16. An air hole 18 is provided on the surface of the guide cylinder 15 below the empty groove 17, and the air hole 18 is connected to the transfer cabin 4 through an air pipe 19 connected to the end of the guide cylinder 15. A fruit core temperature monitoring probe 26 is fixedly connected to the top of the guide cylinder 15. The inner cavity of the bottom ventilation cabin 7 is provided with a positioning mechanism for positioning the guide cylinder 15. When in use, fruits and vegetables that need to be quickly pre-cooled are placed in a pressure-bearing sealed container. In the storage compartment in the sealed box body 1, fruits and vegetables are placed in a plastic turnover basket with holes or a carton with holes, and are neatly stacked. A space of 20 cm is reserved from the top surface of the box body for the convenience of cold air circulation. The storage compartment in the rear half is filled first. After filling, the guide cylinder 15 is rotated clockwise by 90 degrees to set it vertically. At this time, the fruit core temperature monitoring probe 26 above the guide cylinder 15 is inside the stacked vegetable basket, and plays an effective buffering role through the buffer ring 16, and then the pressure-bearing sealing door 13 is closed; the target temperature for precooling fruits and vegetables is set on the LCD touch screen of the control cabinet, and the start button is clicked on the LCD screen after the parameter setting is completed;The refrigeration unit, refrigeration unit 12 and vacuum pump 10 start working at the same time, cooling and reducing the air pressure inside the pressure-bearing sealed box 1. At this time, through the setting of the transfer cabin 4, the side ventilation cabin 6, the bottom ventilation cabin 7 and the air holes 18 on the surface of the guide cylinder 15 simultaneously inhale air, quickly extracting the internal hot gas, and quickly reaching a negative pressure state. The cabin temperature probe monitors the ambient temperature in the box in real time, and the refrigeration temperature is reduced to the preset ambient temperature. The pressure monitoring probe continuously monitors the reduction of the ambient air pressure in the box, and the internal air pressure gradually decreases to 10-30kPa. At this time, the vacuum pump 10 stops working, and then the air inlet valve 9 is closed. Open and slowly introduce outside air. At this time, the box is in a negative pressure state. The gas is input from the air inlet valve 9, filtered by the filter box 8, and then input into the side ventilation cabin 6, the bottom ventilation cabin 7 and the air holes 18 on the surface of the guide cylinder 15 of the transfer cabin 4. The air pressure inside the box slowly increases within 30 to 80 minutes. The fruit core temperature monitoring probe 26 continuously monitors the rapid drop in temperature. After the fruit core temperature reaches the target temperature, the equipment automatically stops running, the pressure inside the pressure-bearing sealed box 1 returns to 1 standard atmospheric pressure, the internal and external pressures of the pressure-bearing sealed door 13 are balanced, and the LCD touch screen on the control cabinet shows that the door can be opened. After the pre-cooling operation is completed, the logic of dynamic low-pressure recovery is used to first quickly extract the warm gas in the fruit core through the tiny gaps between the fruit tissues, forming an extremely low air pressure inside the fruit core. Then, the pressure inside and outside the fruit tends to be balanced under the same environment, and the ambient air pressure in the box is gradually and slowly increased. During this period, the refrigeration unit 12 in the pressure-bearing sealed box 1 continues to cool, and utilizes the pressure difference between the ambient air pressure in the box and the internal air pressure of the fruit to introduce a large amount of cold air in the environment inside the box into the fruit, performing extensive and intensive heat exchange, thereby achieving the effect of quickly reducing the temperature of the fruit core, and during the air extraction and air intake. When the air is exchanged, the side ventilation chamber 6, the bottom ventilation chamber 7 and the air holes 18 on the surface of the guide tube 15 can quickly and evenly exchange air to ensure the changes in the overall temperature and air pressure level. The central position of the guide tube 15 can effectively adjust the internal air pressure, and it can be conveniently folded and raised for use when needed. It has the following advantages: 1. Real-time monitoring of air pressure status; 2. Real-time monitoring of changes in fruit core temperature and ambient temperature; 3. Rapidly reduce the temperature of the intake air to maintain a low ambient temperature; 4. Create a continuous negative pressure potential energy condition for heat exchange inside and outside the fruit. ;

[0029] When the connecting member 14 is rotated to a vertical position with respect to the bottom filter plate 2 , the surface of the embedded groove is placed on the cover plate, and the exposed embedded groove is covered by the cover plate to prevent fruits and vegetables from falling into the bottom ventilation chamber 7 below.

[0030] The inner cavities of the bottom ventilation cabin 7 and the side ventilation cabin 6 are both provided with reinforcing ribs, and the pressure resistance is increased by the reinforcing ribs.

[0031] The side of the connecting member 14 is fixedly connected to the limiting block 21, and the inner cavity of the guide cylinder 15 is provided with a limiting groove 20 which is slidably connected to the limiting block 21. Through the setting of the limiting groove 20 and the limiting block 21, it can be ensured that the guide cylinder 15 can play a role of length limitation while being slidably set above the connecting member 14.

[0032] The positioning mechanism includes a receiving plate 24 fixed in the inner cavity of the embedded groove, the inner cavity of the receiving plate 24 is provided with an inner groove, the inner cavity of the inner groove is fixedly connected with a reset spring 22, the top of the reset spring 22 is fixedly connected with a plug-in rod 23, and the bottom of the guide cylinder 15 is provided with a plug-in groove 25 plugged with the plug-in rod 23. When the guide cylinder 15 is rotated ninety degrees clockwise, the bottom is matched with the top of the receiving plate 24, and the guide cylinder 15 is supported by the receiving plate 24. When it is rotated ninety degrees clockwise, the plug-in rod 23 is plugged into the plug-in groove 25 in the inner cavity of the guide cylinder 15 to position the guide cylinder 15. Then, when it is necessary to cancel the positioning, just pull the guide cylinder 15 upward and pull it out from the connecting piece 14 to cancel the positioning with the plug-in rod 23. At this time, the guide cylinder 15 can be rotated counterclockwise to reset it.

[0033] A filter screen 11 is built into the inner cavity of the filter box 8. Through the setting of the filter screen 11, the air entering from the air inlet valve 9 is filtered and input into the transfer cabin 4 after filtration, so as to increase the pressure in the cabin. The air drawn out by the vacuum pump 10 is drawn into the transfer cabin 4 and then filtered by the filter screen 11 and transported to the vacuum pump 10, thereby protecting the vacuum pump 10. One filter box 8 can realize the filtering function of air intake and air outlet, thus saving equipment cost.

[0034] The side of the pressure-bearing sealed box body 1 is provided with a heat-insulating layer, through which the internal storage compartment is insulated to prevent temperature fluctuations.

[0035] When the pressure-bearing sealed box 1 is refrigerating, the air pressure in the pressure-bearing sealed box is reduced to 10-30kPa. After reaching the set air pressure, the air pressure inside the box is increased to 1 standard atmospheric pressure in 30 to 80 minutes, and the refrigeration unit 12 in the pressure-bearing sealed box continues to cool.

[0036] The inner cavity of the pressure-bearing sealed box 1 is provided with a fruit core movable probe 27 connected by a traction rope, which can be freely inserted into the inside of the fruit core for temperature detection.

[0037] The present invention can be used in fixed places such as agricultural product production areas, distribution centers or processing plants, and can also be made into a container style and used in the transportation of agricultural products such as fruits and vegetables. During the transportation process, the fruits and vegetables are automatically pre-cooled and then transferred to ordinary refrigeration. The present invention has been tested on pre-cooling and cooling of Cuiguan pears, prunes, and citrus, and the expected good results have been achieved. The embodiments are detailed as follows:

[0038] 1. Precooling Cuiguan Pear

[0039] 1) The Cuiguan pears selected for the experiment were from the Cuiguan pear orchard in Fengxian District, Shanghai. The initial average temperature of the Cuiguan pear core was 27.4°C, the initial air pressure in the pressure-bearing sealed box was set to 30 kPa, the ambient temperature in the box was set to 6°C, and the target temperature of the core was set to 8°C.

[0040] 2) The core temperature continued to drop over a period of 70 minutes, eventually dropping to 7.2°C, a decrease of 20.2°C.

[0041] 3) Several Cuiguan pears located at different positions in the box were tested, and the average temperature of the fruit core was less than 8°C.

[0042] 2. Pre-cooling prunes

[0043] 1) The prunes used in the experiment were from Jiashi County, Xinjiang. The initial average temperature of the prune core was 28.7°C. The initial air pressure in the pressure-sealed box was set to 50 kPa, the ambient temperature in the box was set to 5°C, and the target temperature of the prune core was set to 7°C.

[0044] 2) The core temperature continued to drop over a period of 50 minutes, eventually dropping to 5.7°C, a 23°C drop.

[0045] 3) Several Cuiguan pears located at different positions in the box were tested, and the average temperature of the fruit core was less than 7°C.

[0046] 3. Precooling citrus fruits

[0047] 1) The prunes used in the experiment were from Jiaxing City, Zhejiang Province. The initial average temperature of the citrus fruits was 25.5°C, the initial air pressure in the pressure-bearing sealed box was set to 30 kPa, the ambient temperature in the box was set to 3°C, and the target temperature of the fruit core was set to 5°C.

[0048] 2) The core temperature continued to drop over a period of 60 minutes, eventually dropping to 4.2°C, a 21.3°C drop.

[0049] 3) Several Cuiguan pears located at different positions in the box were tested, and the average temperature of the fruit core was less than 5°C.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A dynamic negative pressure rapid precooling device, comprising a pressure-bearing sealed box (1), a pressure-bearing sealed door (13) being hinged on the side of the pressure-bearing sealed box (1), an equipment cabin being arranged at the rear of the pressure-bearing sealed box (1), the equipment cabin being equipped with a refrigeration unit (12), a filter box (8), a vacuum pump (10) and a power distribution control cabinet (27), an internal cooling fan (28) of the refrigeration unit (12) being arranged in the inner cavity of the pressure-bearing sealed box (1), a cabin temperature probe, a fruit core temperature monitoring probe (26) and a pressure probe being arranged in the inner cavity of the pressure-bearing sealed box (1), characterized in that: A transfer cabin (4) is fixedly connected to one side of the pressure-bearing sealed box (1), an air intake valve (9) is provided on the top of the pressure-bearing sealed box (1), one end of the air intake valve (9) is connected to the filter box (8), and the transfer cabin (4) is respectively connected to the vacuum pump (10) and the filter box (8); The inner cavity of the pressure-bearing sealed box (1) is separated by side ventilation chambers (6) on the left and right sides through side filter plates (5), and the bottom of the pressure-bearing sealed box (1) is separated by a bottom ventilation chamber (7) through a bottom filter plate (2). The side ventilation chamber (6) and the bottom ventilation chamber (7) are both connected to the transfer chamber (4) through pipelines. The two side filter plates (5), the bottom filter plate (2) and the partition plate (3) separate a placement chamber for placing fruits and vegetables. The inner cavities of the side filter plates (5) and the bottom filter plate (2) are both provided with a plurality of ventilation ports connected to the placement chamber. The inner cavity of the bottom ventilation cabin (7) is rotatably connected to a connecting piece (14) through an embedded groove, and the side of the connecting piece (14) is slidably connected to a guide cylinder (15). The surface of the guide cylinder (15) is sleeved with a buffer ring (16), and the surface of the buffer ring (16) is provided with a plurality of empty grooves (17). The surface of the guide cylinder (15) located below the empty grooves (17) is provided with air holes (18), and the air holes (18) are connected to the transfer cabin (4) through an air pipe (19) connected to the end of the guide cylinder (15). The inner cavity of the bottom ventilation cabin (7) is provided with a positioning mechanism for positioning the guide cylinder (15).

2. A dynamic negative pressure rapid precooling device according to claim 1, characterized in that: When the connecting member (14) is rotated to a state perpendicular to the bottom filter plate (2), a cover plate is placed on the surface of the embedded groove.

3. A dynamic negative pressure rapid precooling device according to claim 1, characterized in that: The inner cavities of the bottom ventilation chamber (7) and the side ventilation chamber (6) are both provided with reinforcing ribs.

4. The dynamic negative pressure rapid precooling device according to claim 1, characterized in that: The side of the connecting member (14) is fixedly connected to a limiting block (21), and the inner cavity of the guide cylinder (15) is provided with a limiting groove (20) which is slidably connected to the limiting block (21).

5. The dynamic negative pressure rapid precooling device according to claim 1, characterized in that: The positioning mechanism comprises a receiving plate (24) fixed in the inner cavity of the embedded groove, the inner cavity of the receiving plate (24) is provided with an inner groove, the inner cavity of the inner groove is fixedly connected with a reset spring (22), the top of the reset spring (22) is fixedly connected with a plug-in rod (23), the bottom of the guide cylinder (15) is provided with a plug-in groove (25) plugged with the plug-in rod (23), and when the guide cylinder (15) is rotated ninety degrees clockwise, the bottom is matched with the top of the receiving plate (24).

6. The dynamic negative pressure rapid precooling device according to claim 1, characterized in that: A filter screen (11) is built into the inner cavity of the filter box (8).

7. The dynamic negative pressure rapid precooling device according to claim 1, characterized in that: A heat-insulating layer is provided on the side of the pressure-bearing sealed box (1).

8. The dynamic negative pressure rapid precooling device according to claim 1, characterized in that: When the pressure-bearing sealed box (1) is refrigerating, the air pressure inside the pressure-bearing sealed box is reduced to 10-30 kPa. After reaching the set air pressure, the air pressure inside the box is increased to 1 standard atmospheric pressure in 30-80 minutes, and the internal cooling fan of the refrigeration unit (12) in the pressure-bearing sealed box continues to refrigerate.

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