Air suction device for preventing negative pressure damage of cold box
By designing a suction device including a suction cylinder, bent pipe, support plate and soft gasket, the problem that the cold box may form negative pressure during startup or pearlescent sand discharge is solved, and the sealing micro-positive pressure environment in the cold box and the automatic negative pressure removal effect is achieved to prevent the cold box structure damage and pearlescent sand from moisture.
Patent Information
- Application Number
- CN202421332576.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-12
AI Technical Summary
The cold box may form negative pressure in the early stage of starting or during pearlescent sand discharge, resulting in the depression, collapse and damage of the cold box structure.
A suction device is designed to prevent the negative pressure of the cold box from being damaged, including a suction cylinder, a bend, a support plate, a soft gasket and a wire. The soft gasket is pressed on the support plate to form a sealed micro-positive pressure environment. When a negative pressure is formed in the cold box, the soft gasket is sucked up, allowing external air to enter the suction cylinder and the cold box through the bent pipe to eliminate the negative pressure.
By forming a sealed micro-positive pressure environment in the cold box and automatically sucking in external air when negative pressure occurs, it effectively prevents damage to the cold box structure and avoids moisture from pearlescent sand.
Smart Images
Figure CN222598221U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical equipment, in particular to an air suction device for preventing a cold box from being damaged by negative pressure. Background Art
[0002] The air separation cold box is a device that is equipped with low-temperature equipment and pipelines, and is filled with pearl sand insulation materials to keep it cold. In order to prevent humid air from entering the cold box and causing the pearl sand to become damp and affect the insulation effect, the cold box is filled with pressurized nitrogen as a sealing gas to maintain a slightly positive pressure environment in the cold box.
[0003] At the initial start-up of the air separation unit, when the temperature in the cold box drops from room temperature to the normal operating temperature (-190℃), the gas between the pearl sand particles will shrink, causing the gas volume to decrease. If the sealing gas is not replenished in time, negative pressure will be formed in the cold box. When the pearl sand needs to be discharged during the cold box maintenance, if the pearl sand is discharged too fast, it may also cause negative pressure in the cold box. Because the cold box is a large box structure, based on cost considerations, negative pressure conditions are not considered when the cold box structure is designed. If the cold box forms a negative pressure state, it is easy to cause the cold box to sag, collapse and be damaged. Utility Model Content
[0004] The utility model aims to provide an air suction device for preventing the cold box from being damaged by negative pressure, so as to solve the problems raised in the above-mentioned background technology.
[0005] In order to solve the above technical problems, the utility model provides an air suction device for preventing negative pressure damage to a cold box, comprising an air suction cylinder, a bent pipe is fixedly connected to the top of the air suction cylinder, a support plate is fixedly installed on the inner wall of the bent pipe, the support plate is located at one end of the bent pipe away from the air suction cylinder, a soft gasket is arranged inside the bent pipe, the soft gasket is located above the support plate, and an iron wire is connected between the support plate and the soft gasket.
[0006] Furthermore, the support plate is provided with two through holes, the through holes are located in the middle of the support plate, the iron wire is plugged into the through holes, and a part of the iron wire is located inside the through holes.
[0007] Furthermore, the bottom of the soft gasket is in close contact with the top of the support plate, and the bent pipe is connected to the air suction cylinder.
[0008] Furthermore, a desiccant is arranged inside the air suction cylinder.
[0009] Furthermore, two orifice plates are fixedly mounted on the inner wall of the suction cylinder, the orifice plates are provided with a plurality of insertion holes, and the desiccant is located on the top of the orifice plates.
[0010] Furthermore, a fine wire mesh is fixedly installed on the inner wall of the suction cylinder, and the fine wire mesh is located between the two perforated plates.
[0011] Furthermore, two first flanges are fixedly installed on the outer wall of the bent pipe, two second flanges are fixedly installed on the top of the suction cylinder, bolts are threadedly connected between the first flanges and the second flanges, and a first sealing gasket is connected between the first flanges and the second flanges.
[0012] Furthermore, a straight ring is fixedly installed on the bottom of the suction cylinder, two third flanges are fixedly installed on the outer wall of the suction cylinder, two fourth flanges are fixedly installed on the outer wall of the straight ring, screws are threadedly connected between the third flange and the fourth flange, and a second sealing gasket is connected between the third flange and the fourth flange.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] 1. In the utility model, under the action of internal pressure and the weight of the soft gasket, the soft gasket is pressed on the support plate to play a sealing role, so that a sealed micro-positive pressure environment is formed in the cold box. When a negative pressure environment is formed in the cold box, the surrounding of the soft gasket will be sucked up and turned over, so that the outside air can enter the suction cylinder and the cold box through the bent pipe, thereby eliminating the negative pressure in the cold box.
[0015] 2. In the utility model, bolts fix the first flange and the second flange together, thereby fixing the elbow to the top of the suction cylinder to prevent the elbow from loosening and falling. The first sealing gasket seals the connection between the elbow and the suction cylinder to prevent gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;
[0017] Figure 2 This is a schematic diagram of the connection structure between the support plate and the through hole in the utility model;
[0018] Figure 3 This is a schematic diagram of the connection structure between the orifice plate and the jack in the utility model;
[0019] Figure 4 for Figure 1 A magnified view of the structure at center.
[0020] In the figure: 1. elbow;
[0021] 2. Bolts; 3. First flange; 4. Second flange; 5. First sealing gasket; 6. Air suction tube; 7. Desiccant; 8. Screws; 9. Third flange; 10. Fourth flange; 11. Second sealing gasket; 12. Straight ring; 13. Orifice plate; 14. Fine wire mesh; 15. Soft gasket; 16. Iron wire; 17. Support plate; 18. Through hole; 19. Socket. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] See also Figure 1-Figure 4 , the utility model provides a technical solution:
[0024] See also Figure 1-Figure 4 As shown, an air suction device for preventing negative pressure damage to a cold box includes an air suction cylinder 6, a curved pipe 1 is connected to the top of the air suction cylinder 6, a support plate 17 is installed on the inner wall of the curved pipe 1, the support plate 17 is located at one end of the curved pipe 1 away from the air suction cylinder 6, a soft gasket 15 is arranged inside the curved pipe 1, the soft gasket 15 is located above the support plate 17, and an iron wire 16 is connected between the support plate 17 and the soft gasket 15.
[0025] The device is located at the top of the cold box. When negative pressure is formed in the cold box, the air suction cylinder 6 will automatically suck air into the cold box to prevent the cold box from being damaged by negative pressure. The curvature of the elbow 1 can prevent rainwater from entering the air suction cylinder 6 through the elbow 1 and then entering the cold box through the air suction cylinder 6, preventing the pearl sand in the cold box from getting damp and affecting the insulation effect. The soft gasket 15 is tied to the support plate 17 with a wire 16 in the middle;
[0026] When the device is operating normally, there is a slight positive pressure in the cold box. Under the action of the internal pressure and the weight of the soft gasket 15, the soft gasket 15 is pressed on the support plate 17 to seal the cold box, so that a sealed slight positive pressure environment is formed in the cold box. When a negative pressure environment is formed in the cold box, the soft gasket 15 will be sucked up and turned over, so that the outside air can enter the suction cylinder 6 and the cold box through the bent pipe 1, thereby eliminating the negative pressure in the cold box.
[0027] See also Figure 2 and Figure 4 The support plate 17 is provided with two through holes 18 , the through holes 18 are located in the middle of the support plate 17 , the iron wire 16 is plugged into the through holes 18 , and a portion of the iron wire 16 is located inside the through holes 18 .
[0028] The second flange 4 can be inserted into the interior of the elbow 1 through the through hole 18 , so as to facilitate tying the soft gasket 15 on the support plate 17 .
[0029] See also Figure 1 and Figure 4 The bottom of the soft gasket 15 is in close contact with the top of the support plate 17, and the bent pipe 1 is connected to the suction cylinder 6.
[0030] The soft gasket 15 is in close contact with the top of the support plate 17, which can seal the air cylinder 6 and the cold box to prevent gas leakage. When the bent pipe 1 is connected to the air cylinder 6 so that a negative pressure environment is formed in the cold box, the outside air can enter the air cylinder 6 through the bent pipe 1, and then enter the cold box through the air cylinder 6 to eliminate the negative pressure in the cold box.
[0031] See also Figure 1 A desiccant 7 is arranged inside the suction cylinder 6.
[0032] The desiccant 7 can absorb moisture in the moist air to prevent the pearl sand in the cold box from getting damp and affecting the insulation effect.
[0033] See also Figure 1 and Figure 3 Two orifice plates 13 are installed on the inner wall of the suction cylinder 6 , and the orifice plates 13 are provided with a plurality of insertion holes 19 , and the desiccant 7 is located on the top of the orifice plates 13 .
[0034] The orifice plate 13 provides support for the desiccant 7 , and the plurality of holes 19 are provided to facilitate the flow of gas and prevent the gas from being blocked by the orifice plate 13 .
[0035] See also Figure 1 A fine wire mesh 14 is installed on the inner wall of the suction cylinder 6, and the fine wire mesh 14 is located between the two perforated plates 13.
[0036] The fine wire mesh 14 is sandwiched between the two orifice plates 13, which can prevent the pearl sand from entering the suction tube 6 while maintaining smooth air flow, and also prevent the desiccant 7 from falling into the cold box.
[0037] See also Figure 1 Two first flanges 3 are installed on the outer wall of the elbow 1, two second flanges 4 are installed on the top of the suction cylinder 6, bolts 2 are threadedly connected between the first flange 3 and the second flange 4, and a first sealing gasket 5 is connected between the first flange 3 and the second flange 4.
[0038] The first flange 3 and the second flange 4 are fixed together by bolts 2, so that the elbow 1 is fixed on the top of the suction cylinder 6 to prevent the elbow 1 from loosening and falling. The first sealing gasket 5 seals the connection between the elbow 1 and the suction cylinder 6 to prevent gas leakage.
[0039] See also Figure 1 A straight ring 12 is installed at the bottom of the suction cylinder 6, two third flanges 9 are installed on the outer wall of the suction cylinder 6, two fourth flanges 10 are installed on the outer wall of the straight ring 12, screws 8 are threadedly connected between the third flange 9 and the fourth flange 10, and a second sealing gasket 11 is connected between the third flange 9 and the fourth flange 10.
[0040] The third flange 9 is connected to the fourth flange 10 by screws 8, and the straight ring 12 can be fixed on the bottom of the suction cylinder 6. The second sealing gasket 11 seals the connection between the suction cylinder 6 and the straight ring 12 to prevent gas leakage from the connection between the suction cylinder 6 and the straight ring 12. The bottom of the straight ring 12 is welded to the top of the cold box, so that the entire device can be fixed above the cold box.
[0041] Working principle:
[0042] The device is located at the top of the cold box. When negative pressure is formed in the cold box, the air suction cylinder 6 will automatically suck air into the cold box to prevent the cold box from being damaged by negative pressure. The curvature of the elbow 1 can prevent rainwater from entering the air suction cylinder 6 through the elbow 1 and then entering the cold box through the air suction cylinder 6, preventing the pearl sand in the cold box from getting damp and affecting the insulation effect. The soft gasket 15 is tied to the support plate 17 with a wire 16 in the middle;
[0043] When the device is operating normally, there is a slight positive pressure in the cold box. Under the action of the internal pressure and the weight of the soft gasket 15, the soft gasket 15 is pressed on the support plate 17 to seal the cold box, so that a sealed slight positive pressure environment is formed in the cold box. When a negative pressure environment is formed in the cold box, the soft gasket 15 will be sucked up and turned over, so that the outside air can enter the suction cylinder 6 and the cold box through the bent pipe 1, thereby eliminating the negative pressure in the cold box.
[0044] The first flange 3 and the second flange 4 are fixed together by bolts 2, so that the elbow 1 is fixed on the top of the suction cylinder 6 to prevent the elbow 1 from loosening and falling. The first sealing gasket 5 seals the connection between the elbow 1 and the suction cylinder 6 to prevent gas leakage.
Claims
1. An air suction device for preventing cold box from being damaged by negative pressure, comprising an air suction cylinder (6), characterized in that: A curved pipe (1) is fixedly connected to the top of the air suction cylinder (6); a support plate (17) is fixedly installed on the inner wall of the curved pipe (1); the support plate (17) is located at one end of the curved pipe (1) away from the air suction cylinder (6); a soft gasket (15) is arranged inside the curved pipe (1); the soft gasket (15) is located above the support plate (17); and an iron wire (16) is connected between the support plate (17) and the soft gasket (15).
2. An air intake device for preventing cold box from being damaged by negative pressure as claimed in claim 1, characterized in that: The support plate (17) is provided with two through holes (18), the through holes (18) are located in the middle of the support plate (17), the iron wire (16) is plugged into the through holes (18), and a part of the iron wire (16) is located inside the through holes (18).
3. The air intake device for preventing cold box from being damaged by negative pressure according to claim 1, characterized in that: The bottom of the soft gasket (15) is in close contact with the top of the support plate (17), and the bent pipe (1) is connected to the air suction cylinder (6).
4. The air intake device for preventing cold box from being damaged by negative pressure according to claim 1, characterized in that: A desiccant (7) is arranged inside the air suction cylinder (6).
5. An air intake device for preventing cold box from being damaged by negative pressure as claimed in claim 4, characterized in that: Two orifice plates (13) are fixedly mounted on the inner wall of the air suction cylinder (6), the orifice plates (13) are provided with a plurality of insertion holes (19), and the desiccant (7) is located on the top of the orifice plates (13).
6. The air intake device for preventing cold box from being damaged by negative pressure as claimed in claim 1, characterized in that: A fine wire mesh (14) is fixedly mounted on the inner wall of the suction cylinder (6), and the fine wire mesh (14) is located between two perforated plates (13).
7. The air intake device for preventing cold box from being damaged by negative pressure as claimed in claim 1, characterized in that: Two first flanges (3) are fixedly mounted on the outer wall of the curved pipe (1), and two second flanges (4) are fixedly mounted on the top of the suction cylinder (6). Bolts (2) are threadedly connected between the first flange (3) and the second flange (4), and a first sealing gasket (5) is connected between the first flange (3) and the second flange (4).
8. The air intake device for preventing cold box from being damaged by negative pressure according to claim 1, characterized in that: A straight ring (12) is fixedly installed at the bottom of the suction cylinder (6), two third flanges (9) are fixedly installed on the outer wall of the suction cylinder (6), two fourth flanges (10) are fixedly installed on the outer wall of the straight ring (12), screws (8) are threadedly connected between the third flange (9) and the fourth flange (10), and a second sealing gasket (11) is connected between the third flange (9) and the fourth flange (10).