An ethylene adsorption filtering device in fresh agricultural product cold chain transportation

Abstract

The present application relates to a kind of ethylene adsorption filter devices in fresh agricultural products cold chain transportation, including cold chain box body, the inside of the cold chain box body is equipped with filter component, the filter component includes hollow plate that can be adjusted position up and down in the inside of cold chain box body, the lower surface of the hollow plate is communicated with multiple air inlet guide frame, the inside of each air inlet guide frame is fixed with filter screen.The ethylene adsorption filter device in fresh agricultural products cold chain transportation, through the hollow plate that can move up and down, can be according to the flexible adjustment air intake collection position of fresh height, limit telescopic link cooperation electric push rod ensures stable operation, adapts different loadings of fresh transport working condition, multiple evenly distributed air inlet guide frame synchronously collects air in the box, the air outlet hole of bottom annular pipe uniform distribution, let air circulation in the box dead angle, can collect the air containing ethylene everywhere, avoid local gas accumulation cannot be purified.

Description

Technical Field

[0001] This invention relates to the field of ethylene adsorption filtration devices, specifically an ethylene adsorption filtration device for cold chain transportation of fresh agricultural products. Background Technology

[0002] Ethylene adsorption filtration devices can filter ethylene during the cold chain transportation of fresh agricultural products, reducing the intensity of respiration in fresh produce, slowing down the ripening and aging rate of fruits and vegetables, and reducing the spoilage rate of fresh produce.

[0003] At present, most ethylene filtration devices used in the cold chain transportation of fresh agricultural products have fixed air intake structures, which cannot adjust the air intake position according to the stacking height of fresh produce and the loading volume inside the cold chain box. When the fresh produce is stacked too high or too low, the air intake collection effect drops significantly, and the purification adaptability is poor.

[0004] Meanwhile, existing cold chain purification devices have concentrated and single air inlet and outlet points, and limited airflow suction and return range, which easily creates dead zones in the airflow circulation inside the cold chain box. Ethylene gas accumulates in local areas of the box for a long time and cannot be adsorbed and filtered, resulting in uneven purification. During long-term transportation, excessive ethylene in some areas will still accelerate the aging and spoilage of fresh produce, increasing the loss rate. It is difficult to meet the needs of cold chain preservation and transportation of fresh produce under large-capacity and multi-stack conditions. Therefore, an ethylene adsorption and filtration device for cold chain transportation of fresh agricultural products is proposed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an ethylene adsorption and filtration device for cold chain transportation of fresh agricultural products. This device has advantages such as adjustable air intake height and the ability to comprehensively collect air containing ethylene from various locations, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an ethylene adsorption filtration device for cold chain transportation of fresh agricultural products, comprising a cold chain box body, wherein a filtration assembly is provided inside the cold chain box body; The filter assembly includes a hollow plate that can be adjusted up and down inside the cold chain box body. The lower surface of the hollow plate is connected to multiple air intake guide frames. Each air intake guide frame has a filter screen fixed inside. A filter frame is fixed to the left side wall of the inner cavity of the cold chain box body. A filter element is provided on the lower surface of the filter frame. A fan is fixed to the upper surface of the filter frame. The fan has a fixed movable pipe at its outlet end, and the other end of the movable pipe is connected to the left side of the hollow plate. The fan's inlet end is connected to the upper surface of the filter frame through a pipe. An annular pipe is fixed to the bottom wall of the inner cavity of the cold chain box. Multiple air outlets are opened on the inner circumferential wall of the annular pipe. A connecting pipe is connected to the left side of the upper surface of the annular pipe, and the top end of the connecting pipe is connected to the output end of the filter element.

[0007] Furthermore, an electric push rod is fixed to the top wall of the inner cavity of the cold chain box, and the outer side of the output shaft of the electric push rod is fixedly connected to the upper surface of the hollow plate.

[0008] Furthermore, four limiting telescopic rods are fixed to the top wall of the inner cavity of the cold chain box body, and the bottom ends of the four limiting telescopic rods are fixedly connected to the four corners of the upper surface of the hollow plate.

[0009] Furthermore, the limiting telescopic rod includes a first sliding rod, and a second sliding rod is slidably connected inside the first sliding rod.

[0010] Furthermore, the filter element includes a sealing plate fixed to the lower surface of the filter frame by bolts, a fixing cylinder fixed to the upper surface of the sealing plate, a sealing ring fixed to the outer side of the fixing cylinder, the outer side of the sealing ring fitting against the inner peripheral wall of the filter frame to form a seal, and an output pipe connected to the lower surface of the sealing plate, the top end of the connecting pipe being connected to the bottom end of the output pipe.

[0011] Furthermore, the interior of the fixed cylinder is provided with, from top to bottom, a primary dust removal filter cloth, a molecular sieve dehumidification filter layer, a porous activated carbon ethylene adsorption filter layer, and an ultrafine fiber sterilization filter layer.

[0012] Furthermore, a connecting cylinder is provided in the middle of the movable tube, a connecting rod is fixed inside the connecting cylinder, and an ethylene sensor is fixed to the right side of the connecting rod.

[0013] Furthermore, both the ethylene sensor and the fan are electrically connected to the controller in the filtration device via wires.

[0014] Furthermore, the multiple air outlets are evenly distributed on the inner circumferential wall of the annular tube.

[0015] Furthermore, multiple air intake guide frames are evenly distributed on the lower surface of the hollow plate.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects: This ethylene adsorption and filtration device for cold chain transportation of fresh agricultural products features a hollow plate that can move up and down, allowing for flexible adjustment of the air intake and collection position according to the stacking height of the fresh produce. A limiting telescopic rod, combined with an electric push rod, ensures stable lifting and lowering operation, adapting to different loading conditions. Multiple evenly distributed air intake guide frames simultaneously collect air from inside the box, while the bottom annular pipe with evenly distributed air outlets ensures thorough airflow circulation without dead zones, comprehensively collecting ethylene-containing air from all areas and preventing localized gas accumulation that hinders purification. An ethylene sensor monitors the ethylene concentration inside the box in real time and automatically adjusts the fan speed in conjunction with the controller. At high concentrations, rapid and enhanced circulation adsorption is achieved; once standards are met, low-speed operation saves energy and reduces consumption. The airflow undergoes multi-layered filtration, simultaneously completing multiple purification processes including dust removal, dehumidification, ethylene adsorption, and sterilization. The sealed filtration structure prevents airflow short-circuiting, improving purification efficiency, continuously reducing ethylene concentration, effectively delaying the ripening and aging of fruits and vegetables, reducing transportation losses, and extending the shelf life of fresh produce. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 The structure of this invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 This is a schematic diagram of the filter component of the present invention; Figure 5 This is a schematic diagram of the connection structure between the hollow plate and the air intake guide frame of the present invention; Figure 6 This is a schematic diagram of the connection structure between the annular tube and the air outlet of the present invention; Figure 7 This is a schematic diagram of the connection structure of the sealing plate, the inside of the fixing cylinder, and the connecting pipe of the present invention.

[0018] In the diagram: 1. Cold chain box body; 2. Filter assembly; 201. Hollow plate; 202. Air inlet guide frame; 203. Filter screen; 204. Filter frame; 205. Fan; 206. Movable pipe; 207. Ring pipe; 208. Air outlet; 209. Connecting pipe; 210. Sealing plate; 211. Fixed cylinder; 3. Electric push rod; 4. Limiting telescopic rod; 5. Connecting cylinder; 6. Connecting rod; 7. Ethylene sensor. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-3 The ethylene adsorption filtration device for cold chain transportation of fresh agricultural products in this embodiment includes a cold chain box body 1, and a filter component 2 is provided inside the cold chain box body 1.

[0021] Please see Figures 4 to 7 In order to comprehensively collect air containing ethylene from all places and avoid local gas accumulation that cannot be purified, the filter assembly 2 in this embodiment includes a hollow plate 201 that can be adjusted up and down inside the cold chain box body 1. The lower surface of the hollow plate 201 is connected to multiple air inlet guide frames 202. Each air inlet guide frame 202 has a filter screen 203 fixed inside. A filter frame 204 is fixed on the left side wall of the inner cavity of the cold chain box body 1. The lower surface of the filter frame 204 is provided with a filter element, and the upper surface of the filter frame 204 is fixed with a fan 205.

[0022] The air outlet of the fan 205 is fixed with a movable pipe 206. The other end of the movable pipe 206 is connected to the left side of the hollow plate 201. The air inlet of the fan 205 is connected to the upper surface of the filter frame 204 through a pipe. The bottom wall of the inner cavity of the cold chain box body 1 is fixed with an annular pipe 207. Multiple air outlets 208 are opened on the inner peripheral wall of the annular pipe 207. The left side of the upper surface of the annular pipe 207 is connected with a connecting pipe 209. The top end of the connecting pipe 209 is connected to the output end of the filter element. It has the advantages of adjustable air inlet height and comprehensive collection of air containing ethylene from various places.

[0023] An electric push rod 3 is fixed to the top wall of the inner cavity of the cold chain box body 1. The outer side of the output shaft of the electric push rod 3 is fixedly connected to the upper surface of the hollow plate 201. Four limiting telescopic rods 4 are fixed to the top wall of the inner cavity of the cold chain box body 1. The bottom ends of the four limiting telescopic rods 4 are fixedly connected to the four corners of the upper surface of the hollow plate 201. The limiting telescopic rod 4 includes a first sliding rod. A second sliding rod is slidably connected inside the first sliding rod. The filter element includes a sealing plate 210 fixed to the lower surface of the filter frame 204 by bolts. A fixing cylinder 211 is fixed to the upper surface of the sealing plate 210. A sealing ring is fixed to the outer side of the fixing cylinder 211. The outer side of the sealing ring is in contact with the inner peripheral wall of the filter frame 204 to form a seal. An output pipe is connected to the lower surface of the sealing plate 210. The top end of the connecting pipe 209 is connected to the bottom end of the output pipe.

[0024] The interior of the fixed cylinder 211 is arranged from top to bottom as follows: a primary dust removal filter cloth, a molecular sieve dehumidification filter layer, a porous activated carbon ethylene adsorption filter layer, and an ultrafine fiber sterilization filter layer. The middle part of the movable tube 206 is provided with a connecting cylinder 5. A connecting rod 6 is fixed inside the connecting cylinder 5, and an ethylene sensor 7 is fixed on the right side of the connecting rod 6.

[0025] The primary dust collector filter cloth is made of polypropylene SMS composite nonwoven fabric (meltblown + spunbond double-layer structure). It is resistant to cold chain and high humidity environments, has strong hydrophobicity, and can intercept large particles of impurities larger than 5μm such as fruit and vegetable debris, dust, and hair. It has good air permeability and is not easily clogged, making it suitable for low-temperature storage and transportation conditions. The molecular sieve dehumidification filter layer consists of spherical 3A synthetic zeolite molecular sieve particles (fixed with a polypropylene support net). It selectively adsorbs only water vapor molecules in the air and does not adsorb organic gases such as ethylene. It is stable in dehumidification at low temperatures, preventing the lower adsorption material from becoming damp and losing its moisture. The filter layer is made of porous activated carbon ethylene adsorption material, which is modified with copper nitrate and consists of coconut shell columnar activated carbon. The coconut shell carbon has well-developed micropores, and the metal modification significantly increases the ethylene adsorption capacity. It is formed with polyurethane sponge as a carrier, so it does not shed carbon powder. It is specifically designed to remove the ripening ethylene released by fresh food. The ultra-fine fiber sterilization filter layer is made of melt-blown electret polypropylene ultra-fine fiber membrane (food grade) with a fiber pore size of 0.3μm. It physically intercepts mold spores and bacteria, inhibits the mold growth of fresh food in the box, and prevents the release of harmful substances, meeting the safety requirements of the food cold chain.

[0026] The sealing ring on the outside of the fixed cylinder 211 is made of food-grade EPDM rubber, and the sealing ring on the upper surface of the sealing plate 210 is also made of food-grade EPDM rubber. The electric push rod 3 has a standard telescopic stroke of 300mm, which can drive the hollow plate 201 to complete multiple height adjustments.

[0027] When fresh agricultural products are placed inside the cold chain box body 1 and placed inside the annular tube 207 for transportation operations, the controller keeps the device in standby monitoring state. The staff controls the electric push rod 3 on the top wall of the cold chain box body 1 to extend and retract according to the stacking height of the fresh products, which drives the hollow plate 201 to rise and fall vertically. During the lifting and lowering process, the limiting telescopic rods 4 connected to the four corners of the hollow plate 201 extend and retract synchronously. The limiting support is formed by the relative sliding of the first sliding rod and the second sliding rod, so that the hollow plate 201 can rise and fall smoothly without tilting or shaking, thereby completing the adaptation and adjustment of the air intake collection height.

[0028] Both the ethylene sensor 7 and the fan 205 are electrically connected to the controller in the filter device via wires. Multiple air outlets 208 are evenly distributed on the inner circumferential wall of the annular pipe 207, and multiple air inlet guide frames 202 are evenly distributed on the lower surface of the hollow plate 201.

[0029] The fan 205 on the upper surface of the filter frame 204 is started. The fan 205 draws air from the cold chain box. The airflow first passes through the air intake guide frame 202 and is gathered inside the hollow plate 201. The filter screen 203 inside the air intake guide frame 202 intercepts solid impurities such as fresh food scraps and dust in advance. The airflow that has undergone preliminary filtration is transported to the fan 205 through the movable pipe 206. When the airflow passes through the inside of the connecting cylinder 5, the ethylene sensor 7 fixed by the connecting rod 6 continuously detects the ethylene concentration in the airflow in real time and transmits the concentration electrical signal to the controller in real time. The controller automatically adjusts the operating speed of the fan 205 according to the preset threshold and the detected value. When the ethylene concentration is too high, the fan speed of the fan 205 is increased to speed up air circulation and purification. When the concentration meets the standard, the fan speed is reduced to reduce energy consumption.

[0030] It should be noted that after the airflow is pressurized by the fan 205 and sent into the filter frame 204, it flows into the fixed cylinder 211 of the filter element. The sealing ring on the outside of the fixed cylinder 211 is fitted to seal and prevent airflow leakage. The airflow passes through the primary dust removal filter cloth, the molecular sieve dehumidification filter layer, the porous activated carbon ethylene adsorption filter layer, and the ultrafine fiber sterilization filter layer from top to bottom to achieve deep purification, removing water vapor, ethylene gas and mold spores. The purified clean airflow flows from the bottom output pipe of the sealing plate 210 into the connecting pipe 209, and is finally delivered to the bottom annular pipe 207. It is then dispersed back into the cold chain box body 1 through the air outlets 208 evenly distributed on the inner wall of the annular pipe 207, continuously completing the closed-loop circulation filtration of the air inside the box, stably reducing the ethylene content inside the box, delaying the ripening and decay of fresh food, and ensuring the quality of fresh food storage and transportation during long-distance cold chain transportation.

[0031] The working principle of the above embodiments is as follows: When fresh agricultural products are placed inside the cold chain box body 1 and positioned inside the annular tube 207 for transportation, the controller remains in standby monitoring mode. Workers operate the electric push rod 3 on the top wall of the cold chain box body 1 to extend or retract according to the stacking height of the fresh produce, causing the hollow plate 201 to rise and fall vertically. During the lifting and lowering process, the limiting telescopic rods 4 connected to the four corners of the hollow plate 201 extend and retract synchronously. The first sliding rod and the second sliding rod slide relative to each other to form limiting support, ensuring that the hollow plate 201 rises and falls smoothly without tilting or shaking, thus completing the air intake process. After the height is adjusted, the fan 205 on the upper surface of the filter frame 204 is started. The fan 205 draws air from the cold chain box. The airflow first passes through the air inlet guide frame 202 and is gathered inside the hollow plate 201. The filter screen 203 inside the air inlet guide frame 202 intercepts solid impurities such as fresh food scraps and dust in advance. The airflow that has undergone preliminary filtration is delivered to the fan 205 through the movable pipe 206. When the airflow passes through the inside of the connecting cylinder 5, the ethylene sensor 7 fixed by the connecting rod 6 continuously detects the ethylene concentration in the airflow in real time. The concentration signal is transmitted to the controller in real time. The controller automatically adjusts the operating speed of the fan 205 based on the preset threshold and the detected value. When the ethylene concentration is high, the fan speed of the fan 205 is increased to accelerate air circulation and purification. When the concentration meets the standard, the fan speed is reduced to reduce energy consumption. The airflow is pressurized by the fan 205 and sent into the filter frame 204, then flows into the fixed cylinder 211 of the filter element. The sealing ring on the outside of the fixed cylinder 211 is fitted to prevent airflow leakage. The airflow passes from top to bottom through the primary dust removal filter cloth, the molecular sieve dehumidification filter layer, and the porous activated carbon filter. The carbon ethylene adsorption filter layer and the ultra-fine fiber sterilization filter layer achieve deep purification, removing water vapor, ethylene gas and mold spores. The purified clean airflow flows from the bottom output pipe of the sealing plate 210 into the connecting pipe 209, and is finally delivered to the bottom ring pipe 207. It is then dispersed back into the cold chain box body 1 through the air outlets 208 evenly distributed on the inner wall of the ring pipe 207, continuously completing the closed-loop air circulation filtration inside the box, stably reducing the ethylene content inside the box, delaying the ripening and decay of fresh food, and ensuring the quality of fresh food storage and transportation during long-distance cold chain transportation.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ethylene adsorption filtration device for cold chain transportation of fresh agricultural products, comprising a cold chain box body (1), characterized in that: The cold chain box body (1) is equipped with a filter assembly (2) inside. The filter assembly (2) includes a hollow plate (201) that can be adjusted up and down inside the cold chain box body (1). The lower surface of the hollow plate (201) is connected to a plurality of air intake guide frames (202). Each air intake guide frame (202) has a filter screen (203) fixed inside. A filter frame (204) is fixed on the left side wall of the inner cavity of the cold chain box body (1). The lower surface of the filter frame (204) is provided with a filter element. A fan (205) is fixed on the upper surface of the filter frame (204). The air outlet of the fan (205) is fixed with a movable pipe (206), and the other end of the movable pipe (206) is connected to the left side of the hollow plate (201). The air inlet of the fan (205) is connected to the upper surface of the filter frame (204) through a pipe. The bottom wall of the inner cavity of the cold chain box body (1) is fixed with an annular pipe (207). The inner peripheral wall of the annular pipe (207) is provided with multiple air outlet holes (208). The left side of the upper surface of the annular pipe (207) is connected with a connecting pipe (209). The top end of the connecting pipe (209) is connected to the output end of the filter element.

2. The ethylene adsorption filtration device for cold chain transportation of fresh agricultural products according to claim 1, characterized in that: An electric push rod (3) is fixed to the top wall of the inner cavity of the cold chain box body (1), and the outer side of the output shaft of the electric push rod (3) is fixedly connected to the upper surface of the hollow plate (201).

3. The ethylene adsorption filtration device for cold chain transportation of fresh agricultural products according to claim 1, characterized in that: The inner wall of the cold chain box body (1) is fixed with four limiting telescopic rods (4), and the bottom ends of the four limiting telescopic rods (4) are fixedly connected to the four corners of the upper surface of the hollow plate (201).

4. The ethylene adsorption filtration device for cold chain transportation of fresh agricultural products according to claim 3, characterized in that: The limiting telescopic rod (4) includes a first sliding rod, and a second sliding rod is slidably connected inside the first sliding rod.

5. The ethylene adsorption filtration device for cold chain transportation of fresh agricultural products according to claim 1, characterized in that: The filter element includes a sealing plate (210) fixed to the lower surface of the filter frame (204) by bolts. A fixing cylinder (211) is fixed to the upper surface of the sealing plate (210). A sealing ring is fixed to the outer side of the fixing cylinder (211). The outer side of the sealing ring is in contact with the inner peripheral wall of the filter frame (204) to form a seal. An output pipe is connected to the lower surface of the sealing plate (210). The top end of the connecting pipe (209) is connected to the bottom end of the output pipe.

6. The ethylene adsorption filtration device for cold chain transportation of fresh agricultural products according to claim 5, characterized in that: The interior of the fixed cylinder (211) is arranged from top to bottom as follows: a primary dust removal filter cloth, a molecular sieve dehumidification filter layer, a porous activated carbon ethylene adsorption filter layer, and an ultrafine fiber sterilization filter layer.

7. The ethylene adsorption filtration device for cold chain transportation of fresh agricultural products according to claim 1, characterized in that: The active tube (206) has a connecting tube (5) in the middle, and a connecting rod (6) is fixed inside the connecting tube (5). An ethylene sensor (7) is fixed on the right side of the connecting rod (6).

8. The ethylene adsorption filtration device for cold chain transportation of fresh agricultural products according to claim 1, characterized in that: The ethylene sensor (7) and the fan (205) are both electrically connected to the controller in the filter device via wires.

9. The ethylene adsorption filtration device for cold chain transportation of fresh agricultural products according to claim 1, characterized in that: Multiple air outlets (208) are evenly distributed on the inner peripheral wall of the annular tube (207).

10. An ethylene adsorption filtration device for cold chain transportation of fresh agricultural products according to claim 1, characterized in that: Multiple air intake guide frames (202) are evenly distributed on the lower surface of the hollow plate (201).

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