Connecting device for balancing internal and external pressure difference of air-conditioning air bag

Abstract

The connecting device for balancing the internal and external pressure difference of the air adjusting air bag is compact in structure, practical, convenient to use and capable of achieving internal and external pressure balance of a grain barrel. The outer connecting pipe is arranged on one side of the fixing plate and used for being connected with an outer air bag, the inner connecting pipe is arranged at the other end of the fixing plate and used for being connected with an inner air bag, and the outer connecting pipe and the inner connecting pipe are both connected with a switch valve used for controlling air to enter. The outer connecting pipe is connected with an outer connecting valve used for checking air tightness of an outer air bag through inflation, the outer connecting valve is correspondingly arranged on the upper side of the corresponding switch valve, the inner connecting pipe is connected with an outer connecting valve used for checking air tightness of an inner air bag through inflation, and the inner connecting valve is correspondingly arranged on the lower side of the corresponding switch valve. The differential pressure balance connecting device is applied to the technical field of differential pressure balance connecting devices.

Description

Technical Field

[0001] This utility model relates to the technical field of differential pressure balancing connection devices, and in particular to a connection device for balancing the internal and external pressure difference of a modified atmosphere airbag. Background Technology

[0002] As people's living standards continue to improve, they are paying increasing attention to their living environment and demanding higher-quality, pollution-free green food. Furthermore, the Food and Agriculture Organization of the United Nations has further restricted the use of fumigants in grain and oil storage. Therefore, existing grain storage processes are beginning to adopt controlled atmosphere storage technology. This technology involves artificially adjusting the air composition within grain storage warehouses to create oxygen deficiency or anoxic conditions, thereby inhibiting the metabolic activities of harmful organisms, controlling the breeding and spread of pests, suppressing mold growth, reducing the intensity of grain respiration and physiological metabolism, and delaying the aging of grain quality.

[0003] When using controlled atmosphere storage (CAS) in grain silos, the entire silo needs to be sealed to maintain high airtightness. After being filled with nitrogen and sealed, the silos, being concrete or steel structures with high rigidity, lack the ability to balance internal and external pressure. When the internal pressure is higher than the external pressure, nitrogen leaks out through tiny pores; conversely, when the internal pressure is lower than the external pressure, outside air seeps in through these pores. This causes the nitrogen concentration inside the silo to drop too quickly, significantly impacting the effectiveness of CAS pest control and increasing energy consumption. Currently, some areas use internal airbags to adjust the internal pressure of the grain silo. However, due to the weight of the airbag membrane and other factors, it remains close to the ground for extended periods. When the internal pressure is higher than the external pressure, it cannot effectively release air, failing to balance the internal and external pressures. Furthermore, the internal airbags are relatively large, making it impossible to test for airtightness through pressure checks. Leaks are often discovered later during use, resulting in irreparable defects. Additionally, if the internal airbags rupture or perforate during CAS, they cannot be removed from the silo and cannot be repaired, rendering them ineffective and affecting the overall CAS effect. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a compact, practical and convenient modified atmosphere bag connection device that can achieve the balance of internal and external air pressure in grain cylinders.

[0005] The technical solution adopted by this utility model is as follows: This utility model includes a fixing plate, an outer connecting pipe disposed on one side of the fixing plate for connecting the outer airbag, and an inner connecting pipe disposed on the other end of the fixing plate for connecting the inner airbag. Both the outer connecting pipe and the inner connecting pipe are connected to a switch valve for controlling the inlet and outlet of gas. The outer connecting pipe is connected to an outer connecting valve for inflating and checking the airtightness of the outer airbag. The outer connecting valve is correspondingly disposed on the upper side of the corresponding switch valve. The inner connecting pipe is connected to an inner connecting valve for inflating and checking the airtightness of the inner airbag. The inner connecting valve is correspondingly disposed on the lower side of the corresponding switch valve.

[0006] Furthermore, the switching valve includes an upper connecting plate, a lower connecting plate, a rotation limiting block, and a valve component. The upper connecting plate and the lower connecting plate are detachably connected. One side of the upper connecting plate and the lower connecting plate is provided with a clearance groove for the rotation limiting block to press and engage. The valve component is rotatably connected to the rotation limiting block, and the rotation limiting block is formed with a limiting groove for limiting the rotation angle of the valve component.

[0007] Furthermore, the inner wall of the upper connecting plate is provided with an opening, the center line of the opening is on the same straight line as the center line of the rotating limiting block, and the valve component is formed with an extension block that is rotatably connected to the opening.

[0008] Furthermore, the outer connecting pipe and the inner connecting pipe are connected to the fixing plate by a locking member. The locking member includes a locking block, a rotating block rotatably connected to one end of the locking block, and a limiting member rotatably connected to the other end of the locking block. The limiting block is threadedly connected to a rotating catch block for locking the rotating block and the locking block.

[0009] Furthermore, both the locking block and the rotating block have anti-slip pads on their inner walls.

[0010] Furthermore, the fixing plate has connection holes at its four corners, and a positioning block for positioning is provided on the lower surface of the fixing plate.

[0011] The beneficial effects of this utility model are as follows: Since this utility model uses an external connecting pipe connected to the upper part of the external airbag and an internal connecting pipe connected to the lower part of the internal airbag, when the pressure inside the chamber is lower than the pressure outside the chamber, atmospheric air inflates the internal airbag, or nitrogen from the external airbag enters the chamber through the external connecting pipe to balance the pressure difference between the inside and outside. When the pressure inside the chamber is higher than the pressure outside the chamber, nitrogen from the inside chamber inflates the external airbag, or air from the internal airbag is discharged to the atmosphere through the internal connecting pipe. The two work alternately to balance the pressure inside and outside the chamber, reduce the exchange of gases inside and outside, and can maintain a high concentration of nitrogen in the chamber for a longer time, achieving a low-energy-consumption modified atmosphere insecticidal effect. At the same time, the design of the external and internal connecting valves allows the airtightness of the airbag to be detected by injecting gas, solving the problem of troubleshooting airbag damage. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a structural schematic diagram of the fixing plate of this utility model;

[0014] Figure 3 This is an exploded view of the switching valve of this utility model;

[0015] Figure 4 This is a structural schematic diagram of the locking component of this utility model.

[0016] In the diagram: 1. Fixing plate; 11. Connecting hole; 12. Positioning block; 2. External connecting pipe; 3. Internal connecting pipe; 4. Switch valve; 41. Upper connecting plate; 42. Lower connecting plate; 43. Rotary limiting component; 44. Valve component; 45. Relief groove; 46. Limiting groove; 47. Opening; 48. Extending block; 5. External connecting valve; 6. Internal connecting valve; 7. Locking component; 71. Locking block; 72. Rotating block; 73. Limiting component; 74. Rotary blocking block; 75. Anti-slip pad. Detailed Implementation

[0017] like Figures 1 to 4 As shown, in this embodiment, the present invention includes a fixing plate 1, an external connecting pipe 2 disposed on one side of the fixing plate 1 for connecting to the external airbag, and an internal connecting pipe 3 disposed on the other end of the fixing plate 1 for connecting to the internal airbag. Both the external connecting pipe 2 and the internal connecting pipe 3 are connected to a switching valve 4 for controlling the inlet and outlet of gas. The external connecting pipe 2 is connected to an external connecting valve 5 for inflating and checking the airtightness of the external airbag. The external connecting valve 5 is correspondingly disposed on the upper side of the corresponding switching valve 4. The internal connecting pipe 3 is connected to an internal connecting valve 6 for inflating and checking the airtightness of the internal airbag. The internal connecting valve 6 is correspondingly disposed on the lower side of the corresponding switching valve 4. The fixing plate 1 is used to connect and fix to the ventilation port side of the grain silo, and has positioning and connection functions. The upper part of the outer connecting pipe 2 is connected to the outer air bladder, and the lower part of the inner connecting pipe 3 is connected to the inner air bladder. When the pressure inside the silo is lower than the pressure outside the silo, the atmosphere inflates the inner air bladder, or nitrogen from the outer air bladder enters the silo through the outer connecting pipe 2 to balance the pressure difference between the inside and outside. When the pressure inside the silo is higher than the pressure outside the silo, or the air in the inner air bladder is discharged to the atmosphere through the inner connecting pipe 3, nitrogen from the silo inflates the outer air bladder. The two work alternately to balance the pressure inside and outside the silo, reduce the exchange of gases inside and outside, and keep the high concentration of nitrogen in the silo for a longer time, so as to achieve a low-energy-consumption modified atmosphere insecticidal effect. At the same time, the design of the outer connecting valve 5 and the inner connecting valve 6 can detect the airtightness of the inner and outer air bladders by injecting gas, so as to solve the problem of troubleshooting air bladder damage.

[0018] In this embodiment, the switching valve 4 includes an upper connecting plate 41, a lower connecting plate 42, a rotation limiting member 43, and a valve component 44. The upper connecting plate 41 and the lower connecting plate 42 are detachably connected. One side of the upper connecting plate 41 and the lower connecting plate 42 is provided with a clearance groove 45 for the rotation limiting member 43 to press against it. The valve component 44 is rotatably connected to the rotation limiting member 43. The rotation limiting member 43 has a limiting groove 46 for limiting the rotation angle of the valve component 44. The rotation limiting member 43 is used to control the maximum rotational displacement of the valve component 44, creating a stable effect. The upper connecting plate 41 and the lower connecting plate 42 are connected and fixed by screws and bolts. The clearance groove 45 in the upper connecting plate 41 and the connecting plate presses and fixes the rotation limiting member 43 in the middle, facilitating the adjustment and control of the rotation angle of the valve component 44. The edge of the valve component 44 is provided with a sealing edge that fits against the inner wall of the upper connecting plate 41 and the lower connecting plate 42.

[0019] In this embodiment, the inner wall of the upper connecting plate 41 is provided with an opening 47, the center line of the opening 47 is on the same straight line as the center line of the rotation limiting member 43, and the valve member 44 has an extension block 48 that is rotatably connected to the opening 47. The opening 47 is used to rotatably connect the valve member 44 and provide a fulcrum for the rotation of the valve member 44.

[0020] In this embodiment, the outer connecting pipe 2 and the inner connecting pipe 3 are connected to the fixing plate 1 by a locking member 7. The locking member 7 includes a locking block 71, a rotating block 72 rotatably connected to one end of the locking block 71, and a limiting member 73 rotatably connected to the other end of the locking block 71. The limiting member 73 is threadedly connected to a rotating catch block 74 for locking the rotating block 72 and the locking block 71. The locking block 71 and the rotating block 72 cooperate to clamp and lock the connection part, and the threaded rotating catch block 74 locks the position of the locking block 71 and the rotating block 72, ensuring a stable connection between the pipes.

[0021] In this embodiment, both the inner walls of the locking block 71 and the rotating block 72 are provided with anti-slip pads 75. The anti-slip pads 75 are used to increase friction and increase the stability of the locking and fixing.

[0022] In this embodiment, the four corners of the fixing plate 1 are provided with connecting holes 11, and the lower surface of the fixing plate 1 is provided with positioning blocks 12 for positioning.

[0023] The working principle of this utility model:

[0024] Cover the ventilation opening on the top of the grain silo with the fixing plate 1, connect the inner airbag to the lower end of the inner connecting pipe 3, and ensure a tight seal. Connect the inflation pipe to the inner connecting valve 6, close the switch valve 4 on one side of the inner connecting pipe 3, inflate and check the air tightness of the inner airbag. After ensuring that the air tightness of the inner airbag is good, open the switch valve 4 on one side of the inner connecting pipe 3 to empty the air in the inner airbag.

[0025] Connect the outer airbag to the lower end of the outer connecting tube 2 and ensure it is sealed and fixed. Connect the inflation tube to the outer connecting valve 5, close the switch valve 4 on one side of the outer connecting tube 2, inflate and check the air tightness of the outer airbag. After ensuring that the air tightness of the outer airbag is intact, open the switch valve 4 on one side of the inner connecting tube 3 to empty the air in the inner airbag.

[0026] When filling with nitrogen, the switch valve 4 on one side of the external connecting pipe 2 and the internal connecting pipe 3 should be closed. After the nitrogen concentration in the chamber reaches the set concentration, the switch valve 4 should be opened so that the inner and outer air bladders can regulate the pressure difference between the inside and outside.

[0027] Although the embodiments of this utility model are described with reference to actual solutions, they do not constitute a limitation on the meaning of this utility model. For those skilled in the art, modifications to the implementation schemes and combinations with other schemes based on this specification are obvious.

Claims

1. An apparatus for connecting a gas-mixture airbag to balance the pressure difference between the inside and outside, characterized in that: The utility model relates to a kind of airbag test device, including fixed plate (1), outer connecting pipe (2) for connecting outer air bag is arranged in one side of the fixed plate (1), and inner connecting pipe (3) for connecting inner air bag is arranged in the other end of the fixed plate (1), the outer connecting pipe (2) and the inner connecting pipe (3) are connected with the switch valve (4) for controlling gas import and export, the outer connecting pipe (2) is connected with the outer connecting valve (5) for checking the air tightness of outer air bag inflation, the outer connecting valve (5) is correspondingly arranged on the upper side of the corresponding switch valve (4), the inner connecting pipe (3) is connected with the inner connecting valve (6) for checking the air tightness of inner air bag inflation, and the inner connecting valve (6) is correspondingly arranged on the lower side of the corresponding switch valve (4).

2. The connecting device for balancing the internal and external pressure difference of the modified atmosphere air bag according to claim 1, characterized in that: The switch valve (4) includes an upper connecting plate (41), a lower connecting plate (42), a rotation limiting piece (43), and a valve piece (44). The upper connecting plate (41) and the lower connecting plate (42) are detachably connected. One side of the upper connecting plate (41) and the lower connecting plate (42) is provided with a clearance groove (45) for pressure fitting of the rotation limiting piece (43). The valve piece (44) is rotationally connected to the rotation limiting piece (43). The rotation limiting piece (43) is formed with a limiting groove (46) for limiting the rotation angle of the valve piece (44).

3. The connection device for balancing the internal and external pressure difference of the modified atmosphere air bag according to claim 2, characterized in that: The inner wall of the upper connecting plate (41) is provided with an opening (47). The center line of the opening (47) is located on the same straight line as the center line of the rotation limiting piece (43). The valve piece (44) is formed with an extension block (48) rotationally connected to the opening (47).

4. The connecting device of claim 1, wherein: The outer connecting pipe (2) and the inner connecting pipe (3) are connected to the fixed plate (1) by a locking piece (7). The locking piece (7) includes a locking block (71), a rotating block (72) rotationally connected to one end of the locking block (71), and a limiting piece (73) rotationally connected to the other end of the locking block (71). The limiting piece (73) is threadedly connected with a rotating clamping block (74) for locking the rotating block (72) and the locking block (71).

5. The connection device for balancing the internal and external pressure difference of the modified atmosphere air bag according to claim 4, characterized in that: The inner walls of the locking block (71) and the rotating block (72) are both provided with anti-skid pads (75).

6. The connection device for balancing the internal and external pressure difference of the modified atmosphere air bag according to claim 1, characterized in that: The four corners of the fixed plate (1) are provided with connecting holes (11). The lower surface of the fixed plate (1) is provided with a positioning clamping block (12) for positioning.

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