Air port plugging device and grain cooling unit thereof

Abstract

The invention discloses an air port plugging device and a grain cooling unit thereof. An annular limiting boss is formed on the inner wall of one end of an air guide barrel in the circumferential direction of the air guide barrel, and a plurality of first limiting lugs are arranged on the inner wall of the other end of the air guide barrel at intervals in the circumferential direction of the air guide barrel; the tuyere plugging device comprises an elastic sealing assembly capable of freely penetrating through a space formed among the first limiting lugs and a pressing plate connected with the elastic sealing assembly, the distance between the pressing plate and the elastic sealing assembly is adjustable, and the edge of the pressing plate is provided with a plurality of second limiting lugs which are arranged in the circumferential direction and used for being matched with the first limiting lugs in an abutting mode. A receding notch for any first limiting lug to penetrate through is reserved between every two adjacent second limiting lugs. After assembly, the elastic sealing assembly abuts against the annular limiting boss to cover the annular limiting boss, and the multiple second limiting lugs abut against the positions between the multiple first limiting lugs and the elastic sealing assembly in a one-to-one correspondence mode. Compared with the prior art, the safety and efficiency of tuyere sealing assembly are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain cooling unit, in particular to a wind port plugging device and a grain cooling unit thereof. BACKGROUND

[0002] The grain cooling unit is a customized temperature control device developed for grain storage environment, and its core function is to accurately control the temperature and humidity of the air to provide a low-temperature environment suitable for long-term storage of grains in the grain warehouse, which is a key technical equipment for realizing green ecological grain storage. The device needs to meet strict toxic gas protection standards during operation: when the grain warehouse is subjected to phosphine fumigation, the unit must ensure the air-tightness of the whole process - all ventilation circuits from the air inlet to the air outlet must form a closed system, and the air inlet and outlet are sealed and the drain pipe is liquid sealed. The air-tightness detection standard is that after the system is pressurized to 1000Pa, the pressure decay half-life (i.e. the time required for the pressure to drop from 1000Pa to 500Pa) should not be less than 15 minutes, so as to effectively block the leakage of toxic fumigation gas and ensure the safety of the operators.

[0003] In order to ensure that the grain cooling unit meets the air-tightness requirements when it leaves the factory, air-tightness detection needs to be carried out by filling refrigerant, and the return air port and the air outlet of the unit are both in an open state. Therefore, the two air ports need to be plugged with a plugging device before the air-tightness test can be carried out.

[0004] As Figure 1 , the existing plugging device includes a plugging plate 2, a plurality of clamping ears 3 are arranged on the plugging plate 2 along the circumference thereof; during assembly, the plugging plate 2 is embedded into the air guide cylinder 1 provided at the corresponding air port, then sealing glue is filled into the gap between the edge of the plugging plate 2 and the inner wall of the air guide cylinder 1, and then clamps 4 are used to clamp and fix between each clamping ear 3 and the air guide cylinder 1 to complete the plugging of the air port.

[0005] The above-mentioned plugging device has the following problems in use:

[0006] 1. In order to stably bond and fix the plugging plate and the air guide cylinder with the sealing glue, it is necessary to wait for the sealing glue to solidify, which takes a long time and reduces the efficiency of air-tightness detection;

[0007] 2. The clamping ears and the air guide cylinder are clamped and fixed with clamps, and if some clamps are not clamped tightly due to negligence during assembly, and a strong pressure is formed in the grain cooling unit during detection, the plugging plate or the clamp is likely to pop out, which poses a great safety hazard. SUMMARY

[0008] In view of the deficiencies in the prior art, the purpose of the present application is to provide a wind port plugging device and a grain cooling unit to solve the problems of low efficiency of air tightness detection due to long setting time of sealing glue and certain safety hazards of the plugging device in use in the prior art.

[0009] To achieve the above-mentioned purpose, the first aspect of the present application adopts the following technical solution: a wind port plugging device for sealing in a wind guide cylinder matched with the wind port, wherein an annular limiting boss is formed on the inner wall of one end of the wind guide cylinder along the circumferential direction thereof, and a plurality of first limiting ears are arranged on the inner wall of the other end of the wind guide cylinder along the circumferential direction thereof at intervals;

[0010] The wind port plugging device comprises a flexible sealing assembly capable of freely passing through the space formed between the plurality of first limiting ears, and a pressing plate connected with the flexible sealing assembly and having a distance adjustable, the edge of the pressing plate is provided with a plurality of second limiting ears arranged in the circumferential direction for abutting with the first limiting ears, and a gap is left between adjacent two second limiting ears for allowing any first limiting ear to pass through.

[0011] After assembly, the flexible sealing assembly covers the annular limiting boss, and the plurality of second limiting ears abut one by one between the plurality of first limiting ears and the flexible sealing assembly.

[0012] The wind port plugging device is assembled in the following way:

[0013] First, the plurality of second limiting ears and the plurality of first limiting ears are placed in an interleaved manner, and then the flexible sealing assembly is passed through the space formed between the plurality of first limiting ears to enter the wind guide cylinder; then the plurality of second limiting ears pass through the gap between the corresponding adjacent two first limiting ears, and the plurality of second limiting ears pass through the corresponding gap in a relative manner, and the pressing plate is placed between the annular limiting boss and the plurality of first limiting ears; continue to rotate the pressing plate to arrange the plurality of second limiting ears and the plurality of first limiting ears one by one; finally, adjust the pressing plate or the flexible sealing assembly to increase the distance between the pressing plate and the flexible sealing assembly, so that the plurality of second limiting ears and the plurality of first limiting ears abut one by one, and the flexible sealing assembly tightly fits at the annular limiting boss to seal, so as to stably assemble the wind port plugging device in the wind guide cylinder to seal the wind port.

[0014] The wind port plugging device is disassembled in the following way:

[0015] First, adjust the pressing plate or the flexible sealing assembly to reduce the distance between the pressing plate and the flexible sealing assembly, so that the plurality of second limiting ears and the plurality of first limiting ears are disengaged; then rotate to arrange the plurality of second limiting ears and the plurality of first limiting ears in an interleaved manner; then move the pressing plate out of the wind guide cylinder, so as to remove the wind port plugging device from the wind guide cylinder to complete the disassembly.

[0016] The second aspect of the present application adopts the technical scheme as follows: a grain cooling unit is provided with the air inlet sealing device as described in the first aspect of the present application in the air ducts matched with the air inlets and air outlets.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The air inlet sealing device matched with the grain cooling unit is mainly composed of the elastic sealing assembly and the pressing plate with multiple second limiting ears, so as to cooperate with the annular limiting boss and multiple first limiting ears in the air duct matched with the air inlet, so as to stably seal the air inlet and improve the safety; and the air inlet sealing device is simple and fast to operate during assembly and disassembly, which is beneficial to improving the efficiency of air tightness detection. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an assembly schematic view of the existing sealing device on the grain cooling unit.

[0020] Figure 2 It is an assembly schematic view of the air inlet sealing device in an embodiment of the present application on the grain cooling unit.

[0021] Figure 3 It is Figure 2 a partial structural schematic view.

[0022] Figure 4 It is Figure 2 a schematic view of the arrangement of the annular limiting boss in the air duct.

[0023] Figure 5 It is Figure 2 a schematic view of the arrangement of the first limiting ear in the air duct.

[0024] Figure 6 It is a structural schematic view of the air inlet sealing device in an embodiment of the present application.

[0025] Figure 7 It is Figure 6 an exploded view.

[0026] Figure 8 It is Figure 7 an exploded view of the elastic sealing pad.

[0027] Figure 9 It is Figure 7 a structural schematic view of the supporting sealing structure.

[0028] Figure 10 It is Figure 7 a structural schematic view of the pressing plate.

[0029] The reference signs in the drawings of the specification include: air duct 1, blocking plate 2, clamping ear 3, clamp 4, annular limiting boss 5, first limiting ear 6, elastic sealing assembly 7, elastic sealing pad 71, elastic sealing ring 711, metal gasket ring 712, fastening screw 713, supporting sealing structure 72, supporting plate 721, limiting table plate 722, supporting column 723, pressing plate 8, second limiting ear 81, accommodation gap 82, reinforcing strip 83, rotating column 84, handle 85, arc-shaped accommodation hole 86, screw 9, nut 10, refrigerant filling one-way valve 11. DETAILED DESCRIPTION

[0030] The application will be further described in detail through specific embodiments:

[0031] Based on Figure 1 the problems existing in the current blocking device, technical improvements are made on the blocking device, such as Figures 2-10 As shown in the drawings, the embodiment of the application provides an air inlet blocking device for sealing in the air duct 1 assembled at the air inlet. An annular limiting boss 5 is formed on the inner wall of one end of the air duct 1 along the circumferential direction, and a plurality of first limiting ears 6 are arranged on the inner wall of the other end of the air duct 1 along the circumferential direction. The air inlet blocking device comprises an elastic sealing assembly 7 which can freely pass through the space formed between the plurality of first limiting ears 6, and a pressing plate 8 connected to the elastic sealing assembly 7 and having a distance adjustable. The edge of the pressing plate 8 has a plurality of second limiting ears 81 arranged circumferentially for abutting with the first limiting ears 6. An accommodation gap 82 is left between the adjacent two second limiting ears 81 for any first limiting ear 6 to pass through. After assembly, the elastic sealing assembly 7 covers the annular limiting boss 5, and the plurality of second limiting ears 81 abut one by one between the plurality of first limiting ears 6 and the elastic sealing assembly 7.

[0032] The air inlet blocking device is assembled as follows:

[0033] First, the plurality of second limiting ears 81 and the plurality of first limiting ears 6 are placed in an interleaved manner. Then, the elastic sealing assembly 7 is passed through the space formed between the plurality of first limiting ears 6 to enter the air duct 1. Next, the plurality of second limiting ears 81 pass through the gap between the corresponding adjacent two first limiting ears 6, and the plurality of second limiting ears 81 pass through the corresponding accommodation gap 82 in a relative manner. The pressing plate 8 is placed between the annular limiting boss 5 and the plurality of first limiting ears 6. Then, the pressing plate 8 is rotated to arrange the plurality of second limiting ears 81 and the plurality of first limiting ears 6 one by one. Finally, the distance between the pressing plate 8 and the elastic sealing assembly 7 is adjusted to increase, so that the plurality of second limiting ears 81 and the plurality of first limiting ears 6 abut one by one, and the elastic sealing assembly 7 tightly fits at the annular limiting boss 5 to seal. The air inlet blocking device is stably assembled in the air duct 1 to seal the air inlet.

[0034] The air port sealing device is split as follows:

[0035] First, adjust the pressing plate 8 or the elastic sealing assembly 7 to reduce the distance between the pressing plate 8 and the elastic sealing assembly 7, so that the plurality of second limiting ears 81 are disengaged from the plurality of first limiting ears 6; then rotate to stagger the plurality of second limiting ears 81 and the plurality of first limiting ears 6; then move the pressing plate 8 outwardly to the air duct 1, so that the air port sealing device is removed from the air duct 1 to complete the split.

[0036] The air port sealing device matched in the grain cooling unit mainly comprises the elastic sealing assembly 7 and the pressing plate 8 with the plurality of second limiting ears 81, which is matched with the annular limiting boss 5 and the plurality of first limiting ears 6 in the air duct 1 at the air port, so as to stably seal the air port with high safety; and the air port sealing device is simple and fast to operate during assembly and split, which is beneficial to improve the efficiency of the air tightness detection.

[0037] In this embodiment, the air port is the air inlet or air outlet of the grain cooling unit, and the air inlet or air outlet is circular; the air duct 1 is also a circular cylinder, and an annular connecting ear is formed on the outer side of one end of the air duct 1, and the annular connecting ear is fixedly connected to the grain cooling unit by a plurality of screws. The number of the first limiting ears 6 and the second limiting ears 81 is four, which can be adjusted according to actual needs.

[0038] In order to more clearly understand the scheme, the structures such as the elastic sealing assembly 7 and the pressing plate 8 will be described in detail below.

[0039] First, the elastic sealing assembly 7.

[0040] As shown in Figures 6-9 According to another embodiment of the present application, the elastic sealing assembly 7 comprises an elastic sealing pad 71 and a supporting sealing structure 72, the supporting sealing structure 72 is connected to one side of the elastic sealing pad 71 and seals the center hole of the elastic sealing pad 71, and the supporting sealing structure 72 is connected with a screw rod 9 which is threadedly connected with the pressing plate 8.

[0041] Here, the supporting sealing structure 72 is matched with the elastic sealing pad 71 to seal the center hole of the annular limiting boss 5, and the elastic sealing pad 71 is tightly filled between the supporting sealing structure 72 and the annular limiting boss 5 to ensure good sealing performance; the screw rod 9 is threadedly connected with the pressing plate 8 to limit the movement of the screw rod 9, and then the pressing plate 8 is rotated to adjust the distance between the pressing plate 8 and the supporting sealing structure 72, so that the air port sealing device is tightly sealed between the annular limiting boss 5 and the plurality of first limiting ears 6 or is disengaged from the tight state between the annular limiting boss 5 and the plurality of first limiting ears 6 to be split.

[0042] In order to improve the assembly stability of the present tuyere sealing device, a nut 10 can be threadedly connected to the screw rod 9 to limit the position of the pressing plate 8.

[0043] Based on the above scheme, the elastic sealing gasket 71 and the supporting sealing structure 72 are described.

[0044] The supporting sealing structure 72 includes a supporting plate 721 and a limiting platform 722. The supporting plate 721 is connected to one side of the elastic sealing gasket 71 and seals the center hole of the elastic sealing gasket 71. The limiting platform 722 is located on the side of the supporting plate 721 away from the elastic sealing gasket 71, and the limiting platform 722 and the supporting plate 721 are connected and separated by a plurality of supporting columns 723. The screw rod 9 is connected to the side of the limiting platform 722 away from the supporting plate 721.

[0045] Specifically, the supporting plate 721 cooperates with the elastic sealing gasket 71 to seal the annular limiting boss 5, and the limiting platform 722 limits the movement distance of the pressing plate 8 during rotation. The plurality of supporting columns 723 are connected between the limiting platform 722 and the supporting plate 721 to make the supporting sealing structure 72 have a stable structure, ensuring that the present tuyere sealing device can withstand a large pressure. On the other hand, a certain separation distance is formed between the limiting platform 722 and the supporting plate 721, so that during assembly or disassembly, the distance between the pressing plate 8 and the supporting plate 721 is adjusted by rotating the pressing plate 8 to be smaller, thereby improving the assembly and disassembly efficiency of the present tuyere sealing device. In the present scheme, the plurality of supporting columns 723 include a first supporting column 723 connected between the limiting platform 722 and the supporting plate 721, and a plurality of second supporting columns 723 each connected between the limiting platform 722 and the supporting plate 721. The plurality of second supporting columns 723 are arranged circumferentially outside the first supporting column 723. Specifically, in the present embodiment, the number of second supporting columns 723 is four, which can be reasonably adjusted according to actual needs. The arrangement of four second supporting columns 723 and one first supporting column 723 can provide sufficient connection strength between the limiting platform 722 and the supporting plate 721 with a smaller number of supporting columns 723.

[0046] In order to further improve the structural strength of the supporting sealing structure 72, a plurality of reinforcing ribs connected to the limiting platform 722 and / or the supporting plate 721 can be circumferentially connected outside the first supporting column 723.

[0047] The elastic sealing gasket 71 includes an elastic sealing ring 711 and a metal gasket ring 712. The metal gasket ring 712 is fixedly connected between the elastic sealing ring 711 and the supporting sealing structure 72.

[0048] In the embodiment, the elastic sealing ring 711 has a connecting plane for abutting with the metal gasket ring 712 and an arc-shaped contact surface for cooperating with the annular limiting boss 5. Specifically, the elastic sealing ring 711 is a rubber sealing ring, which is integrally formed with the metal gasket ring 712 by injection molding. The connecting plane of the rubber sealing ring is tightly abutted with the metal gasket ring 712, so that the rubber sealing ring and the metal gasket ring 712 have better connection stability. The arc-shaped contact surface of the rubber sealing ring is in contact with the annular limiting boss 5. The rubber sealing ring is deformed along the radial direction under pressure, so that the annular limiting boss 5 and the supporting sealing structure 72 have good sealing performance.

[0049] The metal gasket ring 712 is arranged with four fastening screws 9713 in the circumferential direction, and the supporting plate 721 is provided with four assembly holes in the circumferential direction. The four fastening screws 9713 are correspondingly threaded through the four assembly holes and are connected with nuts, so that the metal gasket ring 712 and the supporting plate 721 are stably and fixedly connected together.

[0050] Secondly, the pressing plate 8.

[0051] As shown in Figure 6 , Figure 7 and Figure 10 According to another embodiment of the present application, the second limiting ear 81 is formed with a reinforcing strip 83 on the side away from the elastic sealing assembly 7, which is used to cooperate with the corresponding first limiting ear 6. The reinforcing strips 83 are located on the same side of the second limiting ear 81 and are scatteredly distributed.

[0052] In the embodiment, the reinforcing strip 83 improves the structural strength of the second limiting ear 81, and further improves the structural strength of the pressing plate 8. Meanwhile, the arrangement of the reinforcing strip 83 on the second limiting ear 81 makes the pressing plate 8 have enough space to move without limitation when the pressing plate 8 is rotated to lock the second limiting ear 81 against the first limiting ear 6.

[0053] The pressing plate 8 is formed with a rotating column 84 and a handle 85 on the side away from the elastic sealing assembly 7. Specifically, the rotating column 84 is connected to the eccentric position of the pressing plate 8, which is convenient for holding the rotating column 84 to rotate the pressing plate 8, so as to adjust the distance between the pressing plate 8 and the supporting plate 721, and further control the assembly of the present air port plugging device. The handle 85 has two and is arranged on the pressing plate 8. Each handle 85 is in the shape of "U". When the present air port plugging device is disassembled, the two handles 85 are convenient for the operator to hold and move out of the air duct 1.

[0054] In order to facilitate the connection of the air tightness detection equipment during the air tightness detection, as shown in Figure 6 and Figure 7As shown, according to another embodiment of the present application, the air port sealing device, the elastic sealing assembly 7 is connected with a refrigerant charging one-way valve 11, and the pressing plate 8 is provided with an arc-shaped clearance hole 86 for the refrigerant charging one-way valve 11 to pass through and to allow clearance when rotating oppositely.

[0055] In the present embodiment, the support plate 721 and the limiting base plate 722 are both provided with through holes, one end of the refrigerant charging one-way valve 11 passes through the arc-shaped clearance hole 86, the through hole on the limiting base plate 722 and the through hole on the support plate 721, and then the refrigerant charging one-way valve 11 is welded and fixed with the limiting base plate 722 and the support plate 721 by welding, and the through holes are sealed at the same time; when the pressing plate 8 is rotated, the arc-shaped clearance hole 86 avoids being limited by the refrigerant charging one-way valve 11 and cannot be rotated, and the cooperation between the arc-shaped clearance hole 86 and the refrigerant charging one-way valve 11 also guides and limits the rotation of the pressing plate 8, thereby improving the rotation accuracy of the pressing plate 8. Then the other end of the refrigerant charging one-way valve 11 is connected with the air tightness detection equipment, so as to perform air tightness detection, and the refrigerant charging one-way valve 11 is used to make the detection medium unidirectionally conductive during the air tightness detection process, thereby improving the stability during the detection process.

[0056] The present air port sealing device is applied to a grain cooling unit, such as Figure 2 As shown, according to another embodiment of the present application, the grain cooling unit is provided with the air port sealing device as described in any of the above embodiments in the air inlet and outlet guide tubes 1.

[0057] When the present grain cooling unit is assembled with the air port sealing device, the air port sealing device is assembled in the air inlet and outlet guide tubes 1 respectively, and each air port sealing device is assembled as follows: first, the pressing plate 8 is determined to be in contact with the limiting base plate 722, so that the present air port sealing device can be easily embedded in the air inlet and outlet guide tubes 1 to be located between the plurality of first limiting ears 6 and the annular limiting boss 5; after the determination is completed, the handle 85 is held to make the plurality of second limiting ears 81 and the plurality of first limiting ears 6 arranged in an interleaved manner, and then the present air port sealing device is sent into the air inlet and outlet guide tubes 1, the elastic sealing assembly 7 passes through the space formed between the plurality of first limiting ears 6 to enter the air inlet and outlet guide tubes 1, and the pressing plate 8 also enters the air inlet and outlet guide tubes 1 to be located between the annular limiting boss 5 and the plurality of first limiting ears 6; the handle 85 is held to rotate by a certain angle until the plurality of second limiting ears 81 and the plurality of first limiting ears 6 are arranged one by one; then the limiting screw 9 is kept stationary, the rotating column 84 is held to rotate the pressing plate 8, the pressing plate 8 moves away from the support plate 721 until the second limiting ear 81 abuts against the corresponding first limiting ear 6, the rubber sealing ring is expanded in the direction to tightly fit the annular limiting boss 5 by being squeezed, and finally the nut 10 is connected with the screw 9 to abut against the pressing plate 8 to complete the assembly.

[0058] When the air tightness needs to be detected, the existing air tightness detection equipment is connected between the refrigerant charging check valves 11 in the assembled two air port blocking devices, and the detection can be performed, thereby having a better working efficiency.

[0059] After the detection is completed, the connection between the refrigerant charging check valves 11 and the air tightness detection equipment is split, the rotating columns 84 in the two air port blocking devices are respectively held to reversely rotate the pressing plates 8 until the pressing plates 8 contact with the limiting table plates 722, the handle 85 is held to rotate the pressing plate 8 until the multiple second limiting ears 81 and the multiple first limiting ears 6 are placed in an interlaced manner, and the handle 85 is held to move the air port blocking device out of the corresponding air duct 1.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A tuyere sealing device, used for sealing in a matching air guide tube at a tuyere, characterized in that: An annular limiting boss is formed on the inner wall of one end of the air guide tube along its circumferential direction, and a plurality of first limiting ears are arranged at intervals along its circumferential direction on the inner wall of the other end of the air guide tube; The air vent blocking device includes an elastic sealing component that can freely pass through the space formed between the plurality of first limiting ears, and a pressure plate connected thereto and having an adjustable distance therebetween. The edge of the pressure plate has a plurality of second limiting ears arranged circumferentially for abutting against the first limiting ears, and a clearance gap is left between two adjacent second limiting ears for any first limiting ear to pass through. After assembly, the elastic sealing component abuts against and covers the annular limiting boss, and the plurality of second limiting ears abut against and correspond one-to-one between the plurality of first limiting ears and the elastic sealing component.

2. The air vent blocking device according to claim 1, characterized in that: The elastic sealing assembly comprises: elastic sealing gasket; The supporting sealing structure is fitted and connected to one side of the elastic sealing gasket and seals the central hole of the elastic sealing gasket. The supporting sealing structure is connected to a screw connected to the pressing plate thread.

3. The air vent blocking device according to claim 2, characterized in that: The supporting sealing structure comprises: A support plate, the support plate being attached to one side of the elastic sealing gasket and sealing the central hole of the elastic sealing gasket; The limiting platform is located on the side of the support plate away from the elastic sealing pad and is connected and separated from the support plate by a plurality of support columns. The screw is connected to the side of the limiting platform away from the support plate.

4. The air vent blocking device according to claim 3, characterized in that: The plurality of support columns include: a first support column connected between the limiting platform and the support plate; There are multiple second support columns, all of which are connected between the limiting platform and the support plate. The multiple second support columns are circumferentially arranged outside the first support column.

5. The air vent blocking device according to claim 2, characterized in that: The elastic sealing gasket comprises: Elastic sealing ring; A metal gasket ring is fixedly connected between the elastic sealing ring and the supporting sealing structure.

6. The air vent blocking device according to claim 5, characterized in that: The elastic sealing ring has a connecting plane for fitting with the metal gasket ring and an arc-shaped contact surface for cooperating with the annular limiting boss.

7. A tuyere blocking device according to any one of claims 1 to 6, characterized in that: A reinforcement strip for cooperating with the corresponding first limiting ears is formed on a side of the plurality of second limiting ears away from the elastic sealing component. The plurality of reinforcement strips are located on the same side of the plurality of second limiting ears and are distributed in a scattered manner.

8. A tuyere blocking device according to any one of claims 1 to 6, characterized in that: The elastic sealing component is connected to a refrigerant filling one-way valve, and the pressure plate is provided with an arc-shaped clearance hole for the refrigerant filling one-way valve to pass through and to make way when the refrigerant fills relatively.

9. A tuyere blocking device according to any one of claims 1 to 6, characterized in that: A rotating column and a handle are formed on the side of the pressing plate away from the elastic sealing component.

10. A grain cooling unit, characterized in that: An air outlet blocking device according to any one of claims 1 to 9 is provided in an air guide tube that cooperates at both the air inlet and the air outlet.

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