An airtight air conditioning unit for grain storage under nitrogen-rich controlled atmosphere conditions

Abstract

This invention relates to the field of air conditioning unit technology, specifically an airtight air conditioning unit for grain storage under nitrogen-rich controlled atmosphere conditions. It includes an air conditioning unit, a protective door, an installation structure, a fixing structure, a limiting structure, a sealing structure, a blocking structure, a mounting frame, a filter, a bracket, and pipes. The limiting structure facilitates quick disassembly and installation of the filter and the air conditioning unit, improving installation and cleaning efficiency. The installation structure facilitates quick installation and fixing of the air conditioning unit to the bracket, improving installation efficiency. The protective door slides between itself and the air conditioning unit, allowing for easy access during maintenance. The fixing structure secures the sliding protective door, improving stability. The sealing structure quickly seals gaps between the pipes and the wall, improving flexibility and sealing effect. The blocking structure prevents the sealing structure from shifting, thus reducing sealing performance.

Description

Technical Field

[0001] This invention relates to the field of air conditioning unit technology, specifically to an airtight air conditioning unit for grain storage under nitrogen-rich controlled atmosphere conditions. Background Technology

[0002] During storage, grains are prone to insect infestation, mold growth, heat generation, moisture loss, or dust accumulation, requiring timely fumigation and pest control. This is typically achieved through nitrogen-filled controlled atmosphere storage technology, which alters the gas composition within the grain pile. The nitrogen concentration inside the film exceeds 98%, creating an ecological environment unfavorable to the growth and development of pests and molds, while also inhibiting grain respiration, thus achieving insect prevention, pest control, and antibacterial effects. Additionally, dedicated grain warehouse air conditioning systems are used to ventilate and cool the grain warehouse.

[0003] However, traditional air conditioning units require a crane to hoist them onto a support frame outside the grain silo during installation, and then multiple bolts are used to fix the unit in place. This bolt-mounted installation is slow. Furthermore, to ensure the filter effectively removes dust, pollutants, and bacteria from the air, it needs to be periodically removed from the air conditioning unit for cleaning. This improves the system's efficiency and extends its lifespan. Because the filter is bolted to the unit, it's difficult to quickly remove it for cleaning, further reducing installation and cleaning efficiency. Finally, to ensure a tight seal between the air conditioning unit's pipes and the grain silo, workers typically apply sealant using a hand-held caulking gun after pipe installation. This manual application is less flexible and may result in uneven application, reducing the sealing effect. Summary of the Invention

[0004] To address the problems in the existing technology, the present invention provides an airtight air conditioning unit for grain storage based on nitrogen-rich controlled atmosphere conditions.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an airtight grain storage special air conditioning unit based on nitrogen-rich controlled atmosphere working condition, comprising: an air conditioning unit; a protective door, wherein the protective door is slidably connected to the air conditioning unit; and a mounting frame, wherein the mounting frame is detachably connected to the air conditioning unit.

[0006] A filter screen is installed on the mounting frame; a bracket is installed on the air conditioning unit; and pipes are installed on the air conditioning unit.

[0007] The air conditioning unit is provided with a limiting structure for limiting the installation frame. The limiting structure includes a limiting plate, which is slidably connected to the air conditioning unit and engages with the installation frame. A second sliding rod is fixedly connected to the limiting plate and is slidably connected to the air conditioning unit. A guide post is fixedly connected to the limiting plate and is slidably connected to the air conditioning unit.

[0008] Specifically, a fixed rod is slidably connected to the second sliding rod, a fixed sleeve is fixedly connected to the air conditioning unit, the fixed rod and the fixed sleeve are slidably connected, the fixed sleeve is provided with a limiting hole that matches the fixed rod, and a third return spring is fixedly connected between the limiting plate and the air conditioning unit.

[0009] Specifically, the bracket is provided with an installation structure, the installation structure includes an installation plate, two installation plates are slidably connected to the bracket, the two installation plates are engaged with the air conditioning unit, a connecting rod is fixedly connected between the two installation plates, and the connecting rod is slidably connected to the bracket.

[0010] Specifically, two first slide rods are slidably connected to the connecting rod. The first slide rods are engaged with the bracket. The bracket is provided with slots that match the first slide rods. The first slide rods are fixedly connected to the pressing block. The pressing block is slidably connected to the connecting rod. A second return spring is fixedly connected between the pressing block and the connecting rod. A first return spring is fixedly connected between the connecting rod and the bracket.

[0011] Specifically, the air conditioning unit is provided with a fixing structure, the fixing structure includes a rubber pad, the rubber pad is slidably connected to the air conditioning unit, the rubber pad abuts against the protective door, a slider is slidably connected to the rubber pad, the slider is slidably connected to the air conditioning unit, a knob is rotatably connected to the air conditioning unit, and the slider and the knob are threaded together.

[0012] Specifically, the air conditioning unit is fixedly connected to a guide rail, the protective door is slidably connected to the guide rail, an anti-detachment block is fixedly connected to the guide rail, and the protective door is slidably connected to the anti-detachment block.

[0013] Specifically, the pipe is provided with a sealing structure, the sealing structure includes a connecting ring, the connecting ring is fixedly connected to the pipe, the connecting ring is provided with a cavity, a compression block is slidably connected to the connecting ring, a connecting pipe is fixedly connected to the connecting ring, the other end of the connecting pipe is fixedly connected to an airbag, and an airbag is provided on the pipe.

[0014] Specifically, a fourth return spring is fixedly connected between the compression block and the connecting ring, and the connecting ring is provided with an air inlet.

[0015] Specifically, the compression block is provided with a blocking structure, the blocking structure includes a stop block, multiple stop blocks are fixedly connected to the compression block, and a stop rod is slidably connected to the connecting ring, the stop rod and the stop block are used in cooperation.

[0016] Specifically, the stop block has a trapezoidal structure, a pull rod is fixedly connected to the stop rod, and a fifth return spring is fixedly connected between the stop rod and the connecting ring.

[0017] The beneficial effects of this invention are:

[0018] (1) The present invention provides an airtight grain storage air conditioning unit based on nitrogen-rich controlled atmosphere. The air conditioning unit is provided with a limiting structure for limiting the installation frame. The setting of the limiting structure facilitates the quick disassembly and installation of the filter screen and the air conditioning unit, thereby improving the installation efficiency and cleaning efficiency.

[0019] (2) The airtight grain storage air conditioning unit based on nitrogen-rich controlled atmosphere working condition of the present invention is installed on a bracket, and the bracket is provided with an installation structure. The installation structure facilitates the quick installation and fixation of the air conditioning unit to the bracket, thereby improving installation efficiency and operational flexibility.

[0020] (3) The airtight grain storage air conditioning unit based on nitrogen-rich controlled atmosphere working condition described in this invention has a protective door slidably connected to the air conditioning unit and a fixed structure provided on the air conditioning unit. The protective door slides between the air conditioning unit and the air conditioning unit, which makes it easy to slide the protective door aside to inspect the inside of the air conditioning unit during maintenance. The fixed structure makes it easy to fix the sliding protective door, which improves stability.

[0021] (4) The airtight grain storage air conditioning unit based on nitrogen-rich gas conditioning conditions of the present invention has a sealing structure on the pipeline and a blocking structure on the compression block. The sealing structure facilitates the quick sealing of the gap between the pipeline and the wall, improving flexibility and sealing effect. The blocking structure also prevents the sealing structure from moving and reducing the sealing performance. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 for Figure 1 The diagram shown is an enlarged view of the structure of part A.

[0025] Figure 3 for Figure 1 The diagram shown is an enlarged view of the structure of section B.

[0026] Figure 4 This is a schematic diagram of the connection structure between the air conditioning unit and the bracket of the present invention;

[0027] Figure 5 for Figure 4 The diagram shows an enlarged view of section C.

[0028] Figure 6 This is a schematic diagram of the connection structure between the filter screen and the air conditioning unit of the present invention;

[0029] Figure 7 This is a schematic diagram of the connection structure between the connecting rod and the bracket of the present invention;

[0030] Figure 8 This is a schematic diagram of the connection structure between the mounting frame and the air conditioning unit of the present invention;

[0031] Figure 9 for Figure 8 The diagram shown is an enlarged view of the structure of part D.

[0032] Figure 10 This is a schematic diagram of the connection structure between the connecting ring and the pipe according to the present invention;

[0033] Figure 11 This is a schematic diagram of the connection structure between the fixing rod and the driving block of the present invention;

[0034] Figure 12 for Figure 11 The diagram shown is an enlarged view of the structure of part E.

[0035] Figure 13 This is a schematic diagram of the connection structure between the sealing block and the connecting ring of the present invention;

[0036] Figure 14 for Figure 13 The diagram shows an enlarged view of the F-section structure.

[0037] Figure 15 This is a schematic diagram of the connection structure between the protective door and the guide rail of the present invention.

[0038] In the diagram: 1. Air conditioning unit; 2. Protective door; 3. Installation structure; 301. Mounting plate; 302. Connecting rod; 303. First return spring; 304. First slide rod; 305. Slot; 306. Pressing block; 307. Second return spring; 4. Fixing structure; 401. Guide rail; 402. Anti-detachment block; 403. Rubber pad; 404. Slider; 405. Knob; 5. Limiting structure; 501. Limiting plate; 502. Second slide rod; 503. Guide column; 504. Third return spring; 505. Fixing rod; 506. Fixing sleeve; 507. Limiting hole; 6. Sealing structure; 601. Connecting ring; 602. Cavity; 603. Compression block; 604. Connecting pipe; 605. Airbag; 606. Fourth return spring; 607. Air inlet; 7. Blocking structure; 701. Stop block; 702. Stop rod; 703. Fifth return spring; 704. Pull rod; 8. Mounting frame; 9. Filter screen; 10. Bracket; 11. Pipe. Detailed Implementation

[0039] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0040] like Figures 1-15 As shown, the airtight grain storage air conditioning unit based on nitrogen-rich controlled atmosphere conditions according to the present invention includes an air conditioning unit 1; a protective door 2, which is slidably connected to the air conditioning unit 1; a mounting frame 8, which is detachably connected to the air conditioning unit 1; a filter screen 9, which is installed on the mounting frame 8; a bracket 10, on which the air conditioning unit 1 is mounted; a pipe 11, on which the air conditioning unit 1 is installed; and a limiting structure 5, which is provided on the air conditioning unit 1 for limiting the mounting frame 8. The limiting structure 5 includes a limiting plate 501, which is slidably connected to the air conditioning unit 1 and engages with the mounting frame 8. A second sliding rod 502 is fixedly connected to the limiting plate 501 and is slidably connected to the air conditioning unit 1. A guide post 503 is fixedly connected to the limiting plate 501 and is slidably connected to the air conditioning unit 1.

[0041] Specifically, a fixed rod 505 is slidably connected to the second slide rod 502, and a fixed sleeve 506 is fixedly connected to the air conditioning unit 1. The fixed rod 505 and the fixed sleeve 506 are slidably connected. The fixed sleeve 506 is provided with a limiting hole 507 that matches the fixed rod 505. A third return spring 504 is fixedly connected between the limiting plate 501 and the air conditioning unit 1. When the filter screen 9 needs to be disassembled for cleaning, the second slide rod 502 can be pulled outward through the fixed rod 505. When the second slide rod 502 slides to the right, it drives the limiting plate 501 to slide to the right. When the limiting plate 501 slides to the right... The guide post 503 slides more smoothly, and the third return spring 504 retracts. When the fixed rod 505 slides to a certain position, it can slide downwards and engage with the limiting hole 507 on the fixed sleeve 506. At the same time, the limiting plate 501 is no longer engaged with the mounting frame 8, and the mounting frame 8 can be pulled outwards. The mounting frame 8 will drive the filter screen 9 to slide out of the air conditioning unit 1. At this time, the filter screen 9 can be taken to a designated position for cleaning. Thus, the engagement between the limiting plate 501 and the mounting frame 8 facilitates the quick disassembly and installation of the filter screen 9 and the air conditioning unit 1, improving installation and cleaning efficiency.

[0042] Specifically, the bracket 10 is provided with an installation structure 3, which includes an installation plate 301. Two installation plates 301 are slidably connected to the bracket 10, and the two installation plates 301 are engaged with the air conditioning unit 1. A connecting rod 302 is fixedly connected between the two installation plates 301, and the connecting rod 302 is slidably connected to the bracket 10. Two first sliding rods 304 are slidably connected to the connecting rod 302, and the first sliding rods 304 are engaged with the bracket 10. The bracket 10 is provided with slots 305 that match the first sliding rods 304. The first sliding rods 304 are fixedly connected to a pressing block 306, and the pressing block 306 is slidably connected to the connecting rod 302. A second return spring 307 is fixedly connected between the pressing block 306 and the connecting rod 302, and a first return spring 303 is fixedly connected between the connecting rod 302 and the bracket 10. When the air conditioning unit 1 needs to be installed, the bracket 10 is first installed on the wall of the grain warehouse with bolts. On the wall, by pressing the pressing block 306, the second return spring 307 retracts when the pressing block 306 slides upward. At the same time, the pressing block 306 will cause the two first slide rods 304 to no longer engage with the slots 305 on the bracket 10. At this time, the two mounting plates 301 can be slid to the left by the connecting rod 302. When the connecting rod 302 slides to the left, the first return spring 303 retracts. At the same time, when the connecting rod 302 slides to a certain position, the pressing block 306 is released, and the first slide rods 304 retract to the first return spring 307. Under the action of the positioning spring 303, it slides downward until it engages with the slot 305 on the outside of the bracket 10. At this time, the air conditioning unit 1 can be hoisted onto the bracket 10 by a crane. After the air conditioning unit 1 is on the bracket 10, the installation of the air conditioning unit 1 and the bracket 10 can be completed by inserting the mounting plate 301 into the air conditioning unit 1. The engagement between the mounting plate 301 and the air conditioning unit 1 facilitates the quick installation and fixation of the air conditioning unit 1 and the bracket 10, improving installation efficiency and operational flexibility.

[0043] Specifically, the air conditioning unit 1 is equipped with a fixing structure 4, which includes a rubber pad 403. The rubber pad 403 is slidably connected to the air conditioning unit 1 and abuts against the protective door 2. A slider 404 is slidably connected to the rubber pad 403 and is slidably connected to the air conditioning unit 1. A knob 405 is rotatably connected to the air conditioning unit 1, and the slider 404 and knob 405 are threadedly connected. A guide rail 401 is fixedly connected to the air conditioning unit 1, and the protective door 2 is slidably connected to the guide rail 401. An anti-detachment block 402 is fixedly connected to the guide rail 401 and is slidably connected to the protective door 2. When it is necessary to inspect the inside of the air conditioning unit 1, the knob 405 can be rotated, and the rotation of the knob 405 will drive the slider threadedly. When slider 404 slides to the right, it causes rubber pad 403 to slide to the right, so that rubber pad 403 is no longer pressed against protective door 2. At this time, protective door 2 can be slid to the left. Protective door 2 will slide between guide rail 401 and anti-detachment block 402. When it slides to a certain position, knob 405 can be turned to drive rubber pad 403 to press against protective door 2, so that the inside of air conditioning unit 1 can be inspected. Thus, the protective door 2 is slidably connected to air conditioning unit 1. During maintenance, it is easy to slide protective door 2 aside for internal maintenance. And the pressing between rubber pad 403 and protective door 2 makes it easy to quickly fix protective door 2 to air conditioning unit 1. In addition, rubber pad 403 increases the friction between protective door 2 and protective door 2, making the fixing effect of protective door 2 better.

[0044] Specifically, the pipe 11 is provided with a sealing structure 6, which includes a connecting ring 601. The connecting ring 601 is fixedly connected to the pipe 11. The connecting ring 601 has a cavity 602. A compression block 603 is slidably connected to the connecting ring 601. A connecting pipe 604 is fixedly connected to the connecting ring 601. The other end of the connecting pipe 604 is fixedly connected to an airbag 605. An airbag 605 is provided on the pipe 11. A fourth reset spring is fixedly connected between the compression block 603 and the connecting ring 601. A spring 606 is provided. An air inlet 607 is provided on the connecting ring 601. A blocking structure 7 is provided on the compression block 603. The blocking structure 7 includes a stop block 701. Multiple stop blocks 701 are fixedly connected to the compression block 603. A stop rod 702 is slidably connected to the connecting ring 601. The stop rod 702 cooperates with the stop blocks 701. The stop block 701 has a trapezoidal structure. A pull rod 704 is fixedly connected to the stop rod 702. A fifth return spring 703 is fixedly connected between the stop rod 702 and the connecting ring 601. When it is necessary to seal the gap between pipe 11 and the wall, by rotating the compression block 603, the fourth return spring 606 contracts as the compression block 603 slides between itself and the connecting ring 601. Simultaneously, the compression block 603 compresses the air in the cavity 602, causing the air in the cavity 602 to enter the airbag 605 through the connecting pipe 604. When the airbag 605 inflates, it seals the gap between pipe 11 and the wall. Thus, by rotating the compression block 603 in conjunction with the airbag 605, the gap between pipe 11 and the wall can be sealed quickly and easily. This improves flexibility and sealing performance. When the compression block 603 slides, it drives multiple stops 701 to move. Since the stops 701 have a trapezoidal structure and the bottom of the stop rod 702 has a triangular structure, when the stops 701 moves clockwise to contact the stop rod 702, the stop rod 702 will slide upward. When the stop rod 702 slides upward, the fifth return spring 703 extends. When the compression block 603 rotates to a certain position, the stop rod 702 and the stops 701 work together to prevent the compression block 603 from rotating and reducing the sealing performance.

[0045] In use, when the air conditioning unit 1 needs to be installed, the bracket 10 is first installed on the wall of the grain warehouse with bolts. Then, by pressing the pressing block 306, the second return spring 307 retracts when the pressing block 306 slides upward. At the same time, the pressing block 306 will cause the two first sliding rods 304 to no longer engage with the slots 305 on the bracket 10. At this time, the two mounting plates 301 can be slid to the left by the connecting rod 302. When the connecting rod 302 slides to the left, the first return spring 303 retracts. At the same time, when the connecting rod 302 slides to a certain position... Release the pressing block 306, and the first slide bar 304 will slide down under the action of the first return spring 303 until it engages with the slot 305 on the outside of the bracket 10. At this time, the air conditioning unit 1 can be hoisted onto the bracket 10 by a crane. After the air conditioning unit 1 is on the bracket 10, the installation plate 301 can be inserted into the air conditioning unit 1 to complete the installation between the air conditioning unit 1 and the bracket 10. The engagement between the installation plate 301 and the air conditioning unit 1 facilitates the quick installation and fixation of the air conditioning unit 1 and the bracket 10, improving installation efficiency and operational flexibility.

[0046] When the filter screen 9 needs to be removed for cleaning, the second sliding rod 502 can be pulled outward by the fixing rod 505. When the second sliding rod 502 slides to the right, it drives the limiting plate 501 to slide to the right. When the limiting plate 501 slides to the right, it slides more smoothly through the guide post 503. At the same time, the third return spring 504 retracts. When the fixing rod 505 slides to a certain position, it can slide down and engage with the limiting hole 507 on the fixing sleeve 506. At the same time, the limiting plate 501 is no longer locked with the mounting frame 8. The mounting frame 8 can be pulled outward, and the mounting frame 8 will drive the filter screen 9 to slide out of the air conditioning unit 1. At this time, the filter screen 9 can be taken to the designated position for cleaning. Thus, the locking between the limiting plate 501 and the mounting frame 8 facilitates the quick disassembly and installation of the filter screen 9 and the air conditioning unit 1, improving installation efficiency and cleaning efficiency.

[0047] When it is necessary to seal the gap between pipe 11 and the wall, by rotating the compression block 603, the fourth return spring 606 contracts as the compression block 603 slides between itself and the connecting ring 601. Simultaneously, the compression block 603 compresses the air in the cavity 602, causing the air in the cavity 602 to enter the airbag 605 through the connecting pipe 604. When the airbag 605 inflates, it seals the gap between pipe 11 and the wall. Thus, by rotating the compression block 603 in conjunction with the airbag 605, the gap between pipe 11 and the wall can be sealed quickly and easily. This improves flexibility and sealing effect. When the compression block 603 slides, it will drive multiple stops 701 to move. Since the stops 701 have a trapezoidal structure and the bottom of the stop rod 702 has a triangular structure, when the stops 701 moves clockwise to contact the stop rod 702, the stop rod 702 will slide upward. When the stop rod 702 slides upward, the fifth return spring 703 extends. When the compression block 603 rotates to a certain position, the stop rod 702 and the stops 701 work together to prevent the compression block 603 from rotating and reducing the sealing performance.

[0048] When it is necessary to inspect the interior of the air conditioning unit 1, the knob 405 can be turned. When the knob 405 is turned, the screw drives the slider 404 to slide to the right. When the slider 404 slides to the right, it drives the rubber pad 403 to slide to the right, so that the rubber pad 403 is no longer pressed against the protective door 2. At this time, the protective door 2 can be slid to the left. The protective door 2 will slide between the guide rail 401 and the anti-detachment block 402. When it slides to a certain position, the knob 405 can be turned to drive the rubber pad 403 to press against the protective door 2, so that the interior of the air conditioning unit 1 can be inspected. Thus, the protective door 2 is slidably connected to the air conditioning unit 1. During the inspection, it is convenient to slide the protective door 2 aside to inspect the interior. And the pressing between the rubber pad 403 and the protective door 2 makes it easy to quickly fix the protective door 2 to the air conditioning unit 1. The rubber pad 403 increases the friction between the protective door and the protective door 2, making the fixing effect of the protective door 2 better.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A special air conditioning unit for airtight grain storage based on nitrogen-rich air conditioning working condition, characterized in that, Include: Air conditioning unit (1); The protective door (2) is slidably connected with the air conditioning unit (1); The mounting frame (8) is detachably connected with the air conditioning unit (1); The filter screen (9) is installed on the mounting frame (8); The bracket (10) is installed on the air conditioning unit (1); The pipe (11) is installed on the air conditioning unit (1); The limiting structure (5) is provided on the air conditioning unit (1) for limiting the mounting frame (8), the limiting structure (5) includes a limiting plate (501), the limiting plate (501) is slidably connected with the air conditioning unit (1), the limiting plate (501) is clamped between the mounting frame (8), the second slide rod (502) is fixedly connected with the limiting plate (501), the second slide rod (502) is slidably connected with the air conditioning unit (1), the guide column (503) is fixedly connected with the limiting plate (501), the guide column (503) is slidably connected with the air conditioning unit (1); The mounting structure (3) is provided on the bracket (10), the mounting structure (3) includes a mounting plate (301), two mounting plates (301) are slidably connected with the bracket (10), the two mounting plates (301) are clamped between the air conditioning unit (1), the connecting rod (302) is fixedly connected between the two mounting plates (301), the connecting rod (302) is slidably connected with the bracket (10); The first slide rod (304) is slidably connected with the connecting rod (302), the first slide rod (304) is clamped with the bracket (10), the bracket (10) is provided with a slot (305) matched with the first slide rod (304), the first slide rod (304) is fixedly connected with the pressing block (306), the pressing block (306) is slidably connected with the connecting rod (302), the second reset spring (307) is fixedly connected between the pressing block (306) and the connecting rod (302), the first reset spring (303) is fixedly connected between the connecting rod (302) and the bracket (10); The sealing structure (6) is provided on the pipe (11), the sealing structure (6) includes a connecting ring (601), the connecting ring (601) is fixedly connected with the pipe (11), the connecting ring (601) is provided with a cavity (602), the compression block (603) is slidably connected with the connecting ring (601), the connecting pipe (604) is fixedly connected with the connecting ring (601), the other end of the connecting pipe (604) is fixedly connected with the air bag (605), the air bag (605) is provided on the pipe (11); The fourth reset spring (606) is fixedly connected between the compression block (603) and the connecting ring (601), the air inlet hole (607) is provided on the connecting ring (601).

2. The air-tight type air conditioning unit for grain storage under the nitrogen-rich air conditioning condition according to claim 1, characterized in that: The second slide rod (502) is slidably connected with a fixing rod (505), the air conditioning unit (1) is fixedly connected with a fixing sleeve (506), the fixing rod (505) and the fixing sleeve (506) are slidably connected, the fixing sleeve (506) is provided with a limiting hole (507) matched with the fixing rod (505), and the limiting plate (501) and the air conditioning unit (1) are fixedly connected with a third reset spring (504).

3. The air-tight type air conditioning unit for grain storage under the nitrogen-rich air conditioning condition according to claim 1, characterized in that: The air conditioning unit (1) is provided with a fixing structure (4), the fixing structure (4) comprises a rubber pad (403), the air conditioning unit (1) is slidably connected with the rubber pad (403), the rubber pad (403) abuts against the protection door (2), the rubber pad (403) is slidably connected with a sliding block (404), the sliding block (404) and the air conditioning unit (1) are slidably connected, the air conditioning unit (1) is rotatably connected with a knob (405), and the sliding block (404) and the knob (405) are threadedly connected.

4. The air-tight type air conditioning unit for grain storage under the nitrogen-rich air conditioning condition according to claim 3, characterized in that: The air conditioning unit (1) is fixedly connected with a guide rail (401), the protection door (2) and the guide rail (401) are slidably connected, the guide rail (401) is fixedly connected with an anti-disengagement block (402), and the protection door (2) and the anti-disengagement block (402) are slidably connected.

5. The air-tight type air conditioning unit for grain storage under the nitrogen-rich air conditioning condition according to claim 1, characterized in that: The compression block (603) is provided with a resisting structure (7), the resisting structure (7) comprises a stop block (701), a plurality of stop blocks (701) are fixedly connected on the compression block (603), a stop rod (702) is slidably connected on the connecting ring (601), and the stop rod (702) is used in cooperation with the stop block (701).

6. The air-tight type air conditioning unit for grain storage under the nitrogen-rich air conditioning condition according to claim 5, characterized in that: The stop block (701) is in a trapezoidal structure, a pull rod (704) is fixedly connected on the stop rod (702), and a fifth reset spring (703) is fixedly connected between the stop rod (702) and the connecting ring (601).

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