A blast hole plugging device and a grain cooling unit thereof

Abstract

The utility model discloses a kind of air port plugging device and its cereal cooling unit, the inner wall of the air duct one end is formed with annular limiting boss along its circumferential direction and its other end inner wall is arranged with multiple first limiting ears along its circumferential direction interval;The air port plugging device includes the elastic sealing assembly that can freely pass through the space formed between multiple first limiting ears and the pressing plate connected with it and distance adjustable, and the edge of pressing plate has multiple second limiting ears for being matched with first limiting ear with circumferential arrangement, and there is a gap for any first limiting ear to pass through between two adjacent second limiting ears;After assembly, elastic sealing assembly covers at annular limiting boss and multiple second limiting ears one-to-one correspond and abut between multiple first limiting ears and elastic sealing assembly;Compared with prior art, the safety and efficiency of air port sealing assembly are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of grain cooling units, specifically to an air vent sealing device and its grain cooling unit. Background Technology

[0002] Grain cooling units are customized temperature control devices specifically developed for grain storage environments. Their core function is to provide a suitable low-temperature environment for long-term grain storage through precise control of air temperature and humidity, making them a key technological equipment for achieving green and ecological grain storage. During operation, this equipment must meet stringent toxic gas protection standards: when the grain depot undergoes phosphine fumigation, the unit must ensure airtight protection throughout the entire process—all ventilation circuits from the air inlet to the air supply terminal must form a closed system, while simultaneously sealing the air inlet and outlet and liquid-sealing the drainage pipes. The airtightness testing standard is: 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) must not be less than 15 minutes, effectively preventing the leakage of highly toxic fumigation gases and ensuring the safety of operators.

[0003] To ensure that the grain cooling unit meets the airtightness requirements when it leaves the factory, an airtightness test is required by refrigerant charging. Since the unit's return air vent and outlet air vent are both open, the two air vents must be sealed with a sealing device before the airtightness test can be conducted.

[0004] like Figure 1 The existing sealing device includes a sealing plate 2, on which multiple clamping ears 3 are arranged circumferentially. During assembly, the sealing plate 2 is embedded into the air duct 1 set at the corresponding air outlet. Then, sealant is used to fill the gap between the edge of the sealing plate 2 and the inner wall of the air duct 1. Finally, clamps 4 are used to clamp and fix each clamping ear 3 to the air duct 1 to complete the sealing of the air outlet.

[0005] The above-mentioned sealing device has the following problems during use:

[0006] 1. In order for the sealant to stably bond and fix the sealing plate to the air duct, it is necessary to wait for the sealant to cure. However, the curing time of the sealant is long, which reduces the efficiency of air tightness testing.

[0007] 2. The clamping ears and the air duct are clamped and fixed together. If negligence occurs during the assembly process and some clamps are not clamped tightly, and strong pressure is formed inside the grain cooling unit during the testing process, the sealing plate or clamps may be ejected, which poses a great safety hazard. Utility Model Content

[0008] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an air vent sealing device and its grain cooling unit, so as to solve the problems of reduced efficiency of air tightness testing due to the long curing time of the sealant and certain safety hazards in the use of the sealing device.

[0009] To achieve the above objectives, the first aspect of this utility model adopts the following technical solution: a vent sealing device for sealing inside a duct that fits at the vent, wherein an annular limiting protrusion is formed on the inner wall of one end of the duct 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.

[0010] The air vent sealing device includes an elastic sealing component that can freely pass through the space formed between multiple first limiting ears and a pressure plate connected thereto and with adjustable distance. The edge of the pressure plate has multiple second limiting ears arranged circumferentially for abutting and cooperating with the first limiting ears, and a clearance notch is left between two adjacent second limiting ears for any first limiting ear to pass through.

[0011] After assembly, the elastic sealing component abuts against the annular limiting boss and covers it, and multiple second limiting ears abut against the multiple first limiting ears and the elastic sealing component in a one-to-one correspondence.

[0012] The air vent sealing device is assembled as follows:

[0013] First, multiple second limiting ears are placed in an alternating manner with multiple first limiting ears. Then, the elastic sealing component passes through the space formed between the multiple first limiting ears and enters the air guide tube. Next, multiple second limiting ears pass through the gap between corresponding adjacent first limiting ears and pass through the corresponding clearance notch. The pressure plate is placed between the annular limiting boss and the multiple first limiting ears. The pressure plate is then rotated to arrange the multiple second limiting ears and the multiple first limiting ears in a one-to-one correspondence. Finally, the pressure plate or the elastic sealing component is adjusted to increase the distance between the pressure plate and the elastic sealing component, so that the multiple second limiting ears and the multiple first limiting ears abut against each other and the elastic sealing component is tightly fitted to the annular limiting boss for sealing. This stabilizes the air outlet sealing device inside the air guide tube to seal the air outlet.

[0014] When disassembling this air vent sealing device, it is as follows:

[0015] First, adjust the pressure plate or elastic sealing assembly to reduce the distance between the pressure plate and the elastic sealing assembly, so that the multiple second limiting ears disengage from the multiple first limiting ears; then rotate to make the multiple second limiting ears and the multiple first limiting ears staggered; then move the pressure plate out of the guide duct to remove the air outlet sealing device from the guide duct to complete the disassembly.

[0016] The second aspect of this utility model adopts the following technical solution: a grain cooling unit, wherein an air duct as described in the first aspect of this utility model is provided in both the air inlet and the air outlet.

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

[0018] The air vent sealing device used in this grain cooling unit mainly consists of an elastic sealing component and a pressure plate with multiple second limiting ears. It cooperates with the annular limiting boss and multiple first limiting ears in the air guide tube at the air vent to stably seal the air vent, ensuring high safety. Furthermore, the air vent sealing device is simple and quick to assemble and disassemble, which helps to improve the efficiency of air tightness testing. Attached Figure Description

[0019] Figure 1 A schematic diagram of the existing sealing device being assembled on a grain cooling unit;

[0020] Figure 2 This is a schematic diagram of the assembly of the air vent sealing device on a grain cooling unit according to one embodiment of the present invention;

[0021] Figure 3 for Figure 2 Schematic diagram of a local structure in the middle;

[0022] Figure 4 for Figure 2 Schematic diagram of the arrangement of the middle annular limiting boss inside the air guide tube;

[0023] Figure 5 for Figure 2 Schematic diagram of the arrangement of the first limiting ear in the air guide tube;

[0024] Figure 6 This is a schematic diagram of the structure of an air vent sealing device according to an embodiment of the present invention;

[0025] Figure 7 for Figure 6 Exploded view;

[0026] Figure 8 for Figure 7 Exploded view of a medium-elasticity gasket;

[0027] Figure 9 for Figure 7 A schematic diagram of the central support sealing structure;

[0028] Figure 10 for Figure 7 Schematic diagram of the intermediate pressure plate.

[0029] The reference numerals in the accompanying drawings include: air duct 1, sealing plate 2, clamping ear 3, clamp 4, annular limiting boss 5, first limiting ear 6, elastic sealing assembly 7, elastic sealing gasket 71, elastic sealing ring 711, metal gasket ring 712, fastening screw 713, supporting sealing structure 72, support plate 721, limiting platform 722, support column 723, pressure plate 8, second limiting ear 81, clearance notch 82, reinforcing strip 83, rotating column 84, handle 85, arc-shaped clearance hole 86, screw 9, nut 10, refrigerant charging check valve 11. Detailed Implementation

[0030] The present invention will be further described in detail below through specific embodiments:

[0031] based on Figure 1 To address the problems with existing sealing devices, technical improvements can be made to the sealing devices, such as... Figures 2-10 As shown, this utility model embodiment proposes an air vent sealing device for sealing inside an air duct 1 that fits at an air vent. An annular limiting boss 5 is formed on the inner wall of one end of the air duct 1 along its circumferential direction, and multiple first limiting ears 6 are spaced apart on the inner wall of the other end along its circumferential direction. The air vent sealing device includes an elastic sealing component 7 that can freely pass through the space formed between the multiple first limiting ears 6, and a pressure plate 8 connected to it and with an adjustable distance. The edge of the pressure plate 8 has multiple second limiting ears 81 arranged circumferentially for abutting against the first limiting ears 6. A clearance notch 82 is left between adjacent second limiting ears 81 for any first limiting ear 6 to pass through. After assembly, the elastic sealing component 7 abuts against the annular limiting boss 5 and covers it, and the multiple second limiting ears 81 abut against the multiple first limiting ears 6 and the elastic sealing component 7 in a one-to-one correspondence.

[0032] The air vent sealing device is assembled as follows:

[0033] First, multiple second limiting ears 81 and multiple first limiting ears 6 are placed in an alternating manner. Then, the elastic sealing component 7 passes through the space formed between the multiple first limiting ears 6 to enter the air guide duct 1. Next, multiple second limiting ears 81 pass through the gap between corresponding adjacent first limiting ears 6 and pass through the corresponding clearance notch 82. The pressure plate 8 is placed between the annular limiting boss 5 and the multiple first limiting ears 6. The pressure plate 8 is then rotated to arrange the multiple second limiting ears 81 and the multiple first limiting ears 6 in a one-to-one correspondence. Finally, the pressure plate 8 or the elastic sealing component 7 is adjusted to increase the distance between the pressure plate 8 and the elastic sealing component 7, so that the multiple second limiting ears 81 and the multiple first limiting ears 6 abut against each other and the elastic sealing component 7 is tightly fitted to the annular limiting boss 5 for sealing. This allows the air outlet sealing device to be stably assembled in the air guide duct 1 to seal the air outlet.

[0034] When disassembling this air vent sealing device, it is as follows:

[0035] First, adjust the pressure plate 8 or the elastic sealing component 7 to reduce the distance between the pressure plate 8 and the elastic sealing component 7, so that the multiple second limiting ears 81 and the multiple first limiting ears 6 are disengaged and abutted; then rotate to make the multiple second limiting ears 81 and the multiple first limiting ears 6 staggered; then move the pressure plate 8 out of the guide duct 1 to remove the air outlet sealing device from the guide duct 1 to complete the disassembly.

[0036] The air vent sealing device used in this grain cooling unit mainly consists of an elastic sealing component 7 and a pressure plate 8 with multiple second limiting ears 81. It cooperates with the annular limiting boss 5 and multiple first limiting ears 6 in the air guide tube 1 at the air vent to stably seal the air vent, ensuring high safety. Furthermore, the air vent sealing device is simple and quick to assemble and disassemble, which helps to improve the efficiency of air tightness testing.

[0037] In this embodiment, the air vent is either the air inlet or outlet of the grain cooling unit, and both the air inlet and outlet are circular. The air guide duct 1 is also a circular cylinder with an annular connecting lug formed on the outer side of one end. The annular connecting lug is fixedly connected to the grain cooling unit by several screws. The number of the first limiting lug 6 and the second limiting lug 81 is shown as four, but the specific number can be adjusted according to actual needs.

[0038] To better understand this solution, the following will describe the structure of the elastic sealing component 7 and the pressure plate 8 in detail.

[0039] First is the elastic sealing component 7.

[0040] like Figures 6-9 As shown, according to another embodiment of the present invention, the air vent sealing device includes an elastic sealing assembly 7 comprising an elastic sealing gasket 71 and a supporting sealing structure 72. The supporting sealing structure 72 is fitted and connected to one side of the elastic sealing gasket 71 and seals the central hole of the elastic sealing gasket 71. A screw 9 connected to the supporting sealing structure 72 is threadedly connected to the pressure plate 8.

[0041] Here, the supporting sealing structure 72 cooperates with the elastic sealing gasket 71 to seal the center hole of the annular limiting boss 5. The elastic sealing gasket 71 tightly fills the space between the supporting sealing structure 72 and the annular limiting boss 5 to ensure good sealing performance. The screw 9 is threadedly connected to the pressure plate 8, which restricts the movement of the screw 9. Then, the pressure plate 8 is rotated to adjust the distance between the pressure plate 8 and the supporting sealing structure 72, so that the air outlet sealing device can be tightened between the annular limiting boss 5 and the multiple first limiting ears 6 for sealing or disassembled from the tightened state between the annular limiting boss 5 and the multiple first limiting ears 6.

[0042] To improve the assembly stability of this air vent sealing device, a nut 10 that abuts and limits the pressure plate 8 can also be threaded onto the screw 9.

[0043] Based on the above scheme, the elastic sealing gasket 71 and the supporting sealing structure 72 will be described in detail.

[0044] The supporting sealing structure 72 includes a supporting plate 721 and a limiting platform 722. The supporting plate 721 is attached to one side of the elastic sealing gasket 71 and seals the central 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 number of supporting columns 723. The screw 9 is connected to the side of the limiting platform 722 away from the supporting plate 721.

[0045] Specifically, the support 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 pressure plate 8 during rotation. Several support columns 723 serve two purposes: firstly, to connect between the limiting platform 722 and the support plate 721 to ensure a stable structure for the supporting sealing structure 72, guaranteeing that the air vent sealing device can withstand greater pressure; secondly, to create a certain separation distance between the limiting platform 722 and the support plate 721, so that during assembly or disassembly, rotating the pressure plate 8 to adjust the distance between the pressure plate 8 and the support plate 721 is minimized, thereby improving the assembly and disassembly efficiency of the air vent sealing device. In this solution, the plurality of support columns 723 includes a first support column 723 and a second support column 723. The first support column 723 is connected between the limiting platform 722 and the support plate 721. There are multiple second support columns 723, all of which are connected between the limiting platform 722 and the support plate 721. The multiple second support columns 723 are arranged circumferentially outside the first support column 723. Specifically, in this embodiment, the number of second support columns 723 is shown as four and can be reasonably adjusted according to actual needs. The arrangement of four second support columns 723 and one first support column 723 can provide sufficient connection strength between the limiting platform 722 and the support plate 721 with a relatively small number of support columns 723.

[0046] To further improve the structural strength of the supporting sealing structure 72, multiple reinforcing ribs connected to the limiting platform 722 and / or the support plate 721 can be circumferentially connected to the outer side of the first support column 723.

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

[0048] In this embodiment, the elastic sealing ring 711 has a connecting plane for fitting with the metal gasket ring 712 and an arc-shaped contact surface for engaging with the annular limiting boss 5. Specifically, the elastic sealing ring 711 is a rubber sealing ring, which is integrally molded with the metal gasket ring 712 by injection molding. The connecting plane of the rubber sealing ring fits tightly 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 contacts the annular limiting boss 5, and the rubber sealing ring deforms radially under pressure, so that the annular limiting boss 5 and the supporting sealing structure 72 have good sealing performance.

[0049] The metal washer ring 712 has four fastening screws 9713 arranged in the circumferential direction. The support plate 721 has four assembly holes along its circumferential direction. The four fastening screws 9713 pass through the four assembly holes one by one and are threaded with nuts so that the metal washer ring 712 and the support plate 721 are stably fixed together.

[0050] Next is pressure plate 8.

[0051] like Figure 6 , Figure 7 as well as Figure 10 As shown, according to another embodiment of the present invention, in the air vent sealing device, a plurality of second limiting ears 81 are provided with reinforcing strips 83 on the side away from the elastic sealing component 7 for cooperating with the corresponding first limiting ears 6. The plurality of reinforcing strips 83 are located on the same side of the plurality of second limiting ears 81 and are distributed in a radiating manner.

[0052] In this embodiment, the reinforcing strip 83 enhances the structural strength of the second limiting ear 81, thereby improving the structural strength of the pressure plate 8. Simultaneously, the arrangement of the reinforcing strip 83 on the second limiting ear 81 ensures that the pressure plate 8 has sufficient unrestricted movement space when rotating the pressure plate 8 to lock the second limiting ear 81 against the first limiting ear 6.

[0053] The pressure plate 8 has a rotating column 84 and a handle 85 formed on its side away from the elastic sealing assembly 7. Specifically, the rotating column 84 is connected to an eccentric position on the pressure plate 8, allowing the pressure plate 8 to be rotated by gripping the rotating column 84, thereby adjusting the distance between the pressure plate 8 and the support plate 721, and thus controlling the assembly of this air vent sealing device. There are two handles 85 arranged facing each other on the pressure plate 8, each handle 85 being U-shaped. When disassembling this air vent sealing device, the two handles 85 are easy for the operator to grip and remove from the air duct 1.

[0054] To facilitate connection to airtightness testing equipment during airtightness testing, such as Figure 6 and Figure 7As shown, according to another embodiment of the present invention, in the air vent sealing device, the elastic sealing component 7 is connected to a refrigerant charging check valve 11, and the pressure plate 8 has an arc-shaped clearance hole 86 for the refrigerant charging check valve 11 to pass through and to make way when they rotate relative to each other.

[0055] In this embodiment, both the support plate 721 and the limiting plate 722 have through holes. One end of the refrigerant charging check valve 11 passes through the arc-shaped relief hole 86, the through hole on the limiting plate 722, and the through hole on the support plate 721. The refrigerant charging check valve 11 is then welded to both the limiting plate 722 and the support plate 721, while simultaneously sealing the through holes. When the pressure plate 8 rotates, the arc-shaped relief hole 86 is prevented from being restricted by the refrigerant charging check valve 11, and the cooperation between the arc-shaped relief hole 86 and the refrigerant charging check valve 11 also guides and limits the rotation of the pressure plate 8, improving its rotation accuracy. The other end of the refrigerant charging check valve 11 is then connected to an airtightness testing device for airtightness testing. The refrigerant charging check valve 11 ensures unidirectional flow of the testing medium during the airtightness testing process, improving the stability of the testing process.

[0056] This air vent sealing device is used in grain cooling units, such as... Figure 2 As shown, according to another embodiment of the present invention, the grain cooling unit is provided with an air outlet sealing device as described in any of the above embodiments in the air guide duct 1 that is fitted at both the air inlet and the air outlet.

[0057] When assembling the air vent sealing device in this grain cooling unit, it is installed in both the air inlet and outlet guide tubes 1. Each air vent sealing device is assembled as follows: First, ensure the pressure plate 8 is in contact with the limiting plate 722 so that the air vent sealing device can easily embed itself into the guide tube 1, positioned between the multiple first limiting ears 6 and the annular limiting boss 5. After confirmation, hold the handle 85 to place the multiple second limiting ears 81 and the multiple first limiting ears 6 in an alternating manner. Then, insert the air vent sealing device into the guide tube 1. The elastic sealing component 7 passes through the space formed between the multiple first limiting ears 6 to enter the air vent. In the air duct 1, the pressure plate 8 also enters the air duct 1 and is positioned between the annular limiting boss 5 and multiple first limiting ears 6; hold the handle 85 and rotate it at a certain angle until multiple second limiting ears 81 are arranged one-to-one with multiple first limiting ears 6; then, keep the limiting screw 9 stationary, hold the rotating column 84 and rotate the pressure plate 8, the pressure plate 8 moves away from the support plate 721 until the second limiting ears 81 and the corresponding first limiting ears 6 are pressed together, the rubber sealing ring is squeezed and spreads in its direction to fit tightly with the annular limiting boss 5, and finally the nut 10 is connected to the screw 9 to abut against the pressure plate 8 to complete the assembly.

[0058] When an airtightness test is required, the existing airtightness testing equipment can be connected between the refrigerant charging check valves 11 in the assembled two-outlet sealing device to perform the test, which has better working efficiency.

[0059] After the test is completed, disconnect the refrigerant charging check valve 11 from the airtightness testing equipment. Then, hold the rotating column 84 in each of the two air outlet sealing devices and rotate the pressure plate 8 in the opposite direction until it contacts the limiting plate 722. Then, hold the handle 85 and rotate the pressure plate 8 until the multiple second limiting ears 81 and multiple first limiting ears 6 are placed in an alternating manner. Then, hold the handle 85 and remove the air outlet sealing device from the corresponding air duct 1.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A vent sealing device for sealing an air duct that is fitted at the vent, characterized in that, The air guide tube has an annular limiting protrusion formed on the inner wall of one end along its circumferential direction, and a plurality of first limiting ears are arranged at intervals on the inner wall of the other end along its circumferential direction. The air vent sealing device includes an elastic sealing component that can freely pass through the space formed between multiple first limiting ears and a pressure plate connected thereto and with adjustable distance. The edge of the pressure plate has multiple second limiting ears arranged circumferentially for abutting and cooperating with the first limiting ears, and a clearance notch is left between two adjacent second limiting ears for any first limiting ear to pass through. After assembly, the elastic sealing component abuts against the annular limiting boss and covers it, and multiple second limiting ears abut against the multiple first limiting ears and the elastic sealing component in a one-to-one correspondence.

2. The air vent sealing device according to claim 1, characterized in that, The resilient sealing assembly includes: Elastic sealing gasket; A supporting sealing structure is attached to one side of the elastic sealing gasket and seals the center hole of the elastic sealing gasket. A screw connected to the supporting sealing structure is threaded to the pressure plate.

3. The air vent sealing device according to claim 2, characterized in that, The supporting sealing structure includes: A support plate is attached to one side of the elastic sealing gasket and seals the center hole of the elastic sealing gasket. A limiting platform is located on the side of the support plate away from the elastic sealing gasket, and the limiting platform and the support plate are connected and separated by several support columns. A screw is connected to the side of the limiting platform away from the support plate.

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

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

6. The air vent sealing 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 engaging with the annular limiting boss.

7. A vent sealing device according to any one of claims 1-6, characterized in that, Each of the multiple second limiting ears has a reinforcing strip formed on the side away from the elastic sealing assembly for cooperating with the corresponding first limiting ear. The multiple reinforcing strips are located on the same side of the multiple second limiting ears and are distributed in a radiating pattern.

8. A vent sealing device according to any one of claims 1-6, characterized in that, The elastic sealing assembly is connected to a refrigerant charging check valve, and the pressure plate has an arc-shaped clearance hole for the refrigerant charging check valve to pass through and make way when they rotate relative to each other.

9. A vent sealing device according to any one of claims 1-6, characterized in that, A rotating column and a handle are formed on the side of the pressure plate away from the elastic sealing assembly.

10. A grain cooling unit, characterized in that, The air inlet and outlet are fitted with air guide tubes containing an air outlet sealing device as described in any one of claims 1-9.

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