A sieve plate locking structure for vacuum pressure swing adsorption oxygen production

Abstract

The utility model relates to the technical field of vacuum pressure swing adsorption oxygen production, especially to a sieve plate locking structure for vacuum pressure swing adsorption oxygen production, the upper sieve plate and the lower sieve plate of the design are tightly connected through a plurality of pull rods with reverse threads, forming an up-down locking structure, simultaneously pressing the molecular sieve bed from two directions, effectively inhibiting the creep and pulverization of the molecular sieve; at the same time, the horizontal calibration assembly cooperates with the adjusting ejector pin, ensuring the overall flatness of the sieve plate; the anti-loose assembly includes static clamping teeth, dynamic clamping teeth and a resisting spring, and cooperates with a wedge-shaped lock nut, maintaining the stability of the locking state even in a vibrating environment, avoiding the loosening of the locking structure; in addition, the spring compensator and the elastic compensation layer arranged on the contact surface of the sieve plate jointly compensate the slight unevenness of the molecular sieve bed, ensuring the uniformity of the pressure distribution and further prolonging the service life of the molecular sieve.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pressure swing adsorption (PSA) oxygen generation technology, and in particular to a sieve plate locking structure for PSA oxygen generation. Background Technology

[0002] Vacuum pressure swing adsorption (VSA) oxygen generation technology, as an important means of industrial gas separation, has been widely used in various fields such as steel, chemical, and medical industries due to its high efficiency, flexibility, and relatively low operating costs. This technology achieves oxygen separation and purification through the selective adsorption and desorption of molecular sieves within the adsorption tower. In existing technologies, the design of the adsorption tower has been continuously optimized, and the performance of molecular sieve materials has been continuously improved, resulting in high levels of oxygen generation efficiency and product quality. At the same time, the application of automated control technology has further improved the stability and ease of operation of the system, providing a reliable gas supply guarantee for industrial production.

[0003] Currently, the molecular sieves filled inside the adsorption tower will experience peristalsis and pulverization due to periodic pressure changes during continuous operation. Secondly, the pulverization of molecular sieves not only leads to increased equipment resistance and decreased separation efficiency, but may also damage downstream equipment and affect the stable operation of the entire oxygen production system. Although some molecular sieve compaction measures have been adopted in existing technologies, there are still problems such as uneven compaction, insufficient flatness of the sieve plate, and complex locking structure. Utility Model Content

[0004] The purpose of this utility model is to provide a sieve plate locking structure for vacuum pressure swing adsorption oxygen production, which aims to solve the technical problems of uneven compression, insufficient flatness of the sieve plate, and complex locking structure that are common in the prior art.

[0005] To achieve the above objectives, this utility model employs a sieve plate locking structure for vacuum pressure swing adsorption (PSA) oxygen generation, comprising an upper sieve plate, a lower sieve plate, multiple pull rods, and an adsorption tower body. The outer edges of both the upper and lower sieve plates have multiple threaded grooves. Each pull rod has an adjusting pin below it. From bottom to top, each pull rod has a horizontal calibration component, an anti-loosening component, a spring compensator, and a wedge-shaped anti-loosening nut arranged sequentially above it, with the spring compensator abutting against the anti-loosening component. Each pull rod has reverse threads at both ends. A molecular sieve bed is disposed within the adsorption tower body. The upper sieve plate is positioned at the top of the molecular sieve bed, and the lower sieve plate is positioned at the bottom of the molecular sieve bed. The multiple pull rods are threaded onto the outer edges of the upper and lower sieve plates, with the reverse threads located within the corresponding threaded grooves. The horizontal calibration component abuts against the upper end face of the upper sieve plate, and the adjusting pin abuts against the lower end face of the lower sieve plate.

[0006] The level calibration component is either a bubble level or an electronic level sensor.

[0007] The wedge-shaped anti-loosening nut is a structure consisting of an elastic washer and a double nut.

[0008] The anti-loosening component includes multiple stationary locking teeth, multiple movable locking teeth, and a mounting sleeve. Each movable locking tooth has a retaining spring at one end. The mounting sleeve has multiple mounting grooves. The multiple stationary locking teeth are fixedly connected to the pull rod and located on the outside of the pull rod. The multiple movable locking teeth are slidably connected to the mounting sleeve and located in the mounting grooves. The springs are located in the corresponding mounting grooves. The mounting sleeve is fitted onto the pull rod, and the multiple movable locking teeth abut against the corresponding stationary locking teeth.

[0009] The contact surfaces between the upper sieve plate and the molecular sieve bed, as well as the contact surfaces between the lower sieve plate and the molecular sieve bed, are provided with elastic compensation layers.

[0010] This invention discloses a sieve plate locking structure for vacuum pressure swing adsorption (PSA) oxygen production. The upper and lower sieve plates are tightly connected by multiple pull rods with reverse threads, forming an upper and lower locking structure. This simultaneously presses the molecular sieve bed from two directions, effectively suppressing the peristalsis and pulverization of the molecular sieve. Simultaneously, the horizontal calibration component, in conjunction with the adjusting pin, ensures the overall flatness of the sieve plate. The anti-loosening component, including static locking teeth, moving locking teeth, and a retaining spring, works in conjunction with the wedge-shaped anti-loosening nut to maintain a stable locking state even under vibration, preventing loosening of the locking structure. Furthermore, the spring compensator and the elastic compensation layer located on the sieve plate contact surface compensate for minor non-uniformities in the molecular sieve bed, ensuring uniform pressure distribution and further extending the service life of the molecular sieve. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is the front view of this utility model.

[0013] Figure 2 This is a schematic diagram of the tie rod in this utility model.

[0014] Figure 3 This is an enlarged view of the anti-loosening component in this utility model.

[0015] 1-Upper sieve plate, 2-Lower sieve plate, 3-Pull rod, 4-Adsorption tower body, 5-Molecular sieve bed, 6-Adjusting pin, 7-Horizontal calibration assembly, 8-Spring compensator, 9-Wedge-shaped anti-loosening nut, 10-Static locking tooth, 11-Moving locking tooth, 12-Mounting sleeve, 13-Holding spring, 14-Mounting groove. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0017] Please see Figures 1-3 This utility model provides a sieve plate locking structure for vacuum pressure swing adsorption (PSA) oxygen generation, including an upper sieve plate 1, a lower sieve plate 2, multiple pull rods 3, and an adsorption tower body 4. The outer edges of both the upper sieve plate 1 and the lower sieve plate 2 have multiple threaded grooves. Each pull rod 3 has an adjusting pin 6 below it. Above each pull rod 3, from bottom to top, are sequentially arranged a horizontal calibration component 7, an anti-loosening component, a spring compensator 8, and a wedge-shaped anti-loosening nut 9. The spring compensator 8 abuts against the anti-loosening component. The two ends of the pull rod 3 have reverse threads. A molecular sieve bed 5 is provided inside the adsorption tower body 4. The upper sieve plate 1 is provided on the top of the molecular sieve bed 5, and the lower sieve plate 2 is provided on the bottom of the molecular sieve bed 5. Multiple pull rods 3 are respectively threaded on the outer edges of the upper sieve plate 1 and the lower sieve plate 2, and the reverse threads are located in the corresponding thread grooves. The horizontal calibration component 7 abuts against the upper end face of the upper sieve plate 1, and the adjusting pin 6 abuts against the lower end face of the lower sieve plate 2.

[0018] In this embodiment, multiple tie rods 3 with reverse threads are tightly connected to form an efficient upper and lower locking structure. This design applies pressure from both the upper and lower directions of the molecular sieve bed 5, effectively suppressing the peristalsis and pulverization caused by periodic pressure changes during continuous operation of the molecular sieve. This structure significantly reduces equipment resistance, improves separation efficiency, and prevents potential damage to downstream equipment, thereby ensuring the long-term stable operation of the oxygen production system.

[0019] Furthermore, the level calibration component 7 is a bubble level or an electronic level sensor.

[0020] In this embodiment, the bubble level or electronic level sensor is used as the level calibration component 7, which can monitor and adjust the levelness of the upper end face of the upper sieve plate 1 in real time and accurately. This design ensures the overall height consistency of the sieve plate, avoids the problem of fluidized wear of molecular sieve caused by uneven local compression, and further improves the operational stability of the equipment and the service life of the molecular sieve.

[0021] Furthermore, the wedge-shaped anti-loosening nut 9 has an elastic washer and a double nut structure.

[0022] In this embodiment, the elastic washer effectively absorbs vibration energy, while the double nut structure provides additional locking force, together ensuring the long-term stability of the locked state and avoiding equipment failure and safety hazards caused by loosening.

[0023] Furthermore, the anti-loosening component includes multiple stationary locking teeth 10, multiple movable locking teeth 11, and a mounting sleeve 12. Each movable locking tooth 11 has a retaining spring 13 at one end. The mounting sleeve 12 has multiple mounting grooves 14. The multiple stationary locking teeth 10 are respectively fixedly connected to the pull rod 3 and located on the outside of the pull rod 3. The multiple movable locking teeth 11 are respectively slidably connected to the mounting sleeve 12 and located in the mounting grooves 14. The springs are set in the corresponding mounting grooves 14. The mounting sleeve 12 is sleeved on the pull rod 3, and the multiple movable locking teeth 11 abut against the corresponding stationary locking teeth 10.

[0024] In this embodiment, the retaining spring 13 at one end of the moving locking tooth 11 ensures tight contact between the moving locking tooth 11 and the stationary locking tooth 10, maintaining a locked state even under vibration or impact conditions. This design enhances the vibration resistance of the equipment and improves the stability and reliability of the locking structure.

[0025] Furthermore, the contact surfaces of the upper sieve plate 1 and the molecular sieve bed 5, as well as the contact surfaces of the lower sieve plate 2 and the molecular sieve bed 5, are all provided with elastic compensation layers.

[0026] In this embodiment, this design ensures the uniform distribution of force on the molecular sieve bed 5, avoiding damage and performance degradation of the molecular sieve due to excessive local pressure; at the same time, the elastic compensation layer also plays a role in shock absorption, further extending the service life of the molecular sieve and equipment.

[0027] When using this invention, the lower sieve plate 2 is accurately placed at a predetermined position at the bottom of the adsorption tower body 4. Then, the lower ends of multiple pull rods 3 with reverse threads are passed through the mounting holes on the edge of the lower sieve plate 2 and secured with wedge-shaped anti-loosening nuts 9. Next, the molecular sieve bed 5 is uniformly filled into the adsorption tower to a predetermined height. The upper sieve plate 1 is then placed on top of the molecular sieve bed 5, with the upper ends of the pull rods 3 passing through the corresponding mounting holes. Afterward, the horizontal calibration component 7 and the adjustment... The upper screen plate 1 is finely adjusted by adjusting the pin 6 to ensure overall flatness. Then, all the pull rods 3 are tightened simultaneously using the anti-loosening component and the reverse rack loosening device to lock after reaching the predetermined pre-tightening force. Finally, the elastic compensation layer is set on the contact surface between the upper screen plate 1 and the lower screen plate 2 and the molecular sieve to compensate for the slight unevenness of the molecular sieve bed 5 and ensure uniform pressure distribution, thereby completing the entire screen plate locking process and effectively solving the problems of uneven molecular sieve compression, insufficient screen plate flatness, and complex locking structure.

[0028] This utility model has the following significant beneficial effects:

[0029] ① High locking reliability: The upper and lower locking structure presses the molecular sieve from two directions simultaneously, effectively suppressing the peristalsis and pulverization of the molecular sieve. The bidirectional tie rod 3 structure makes the molecular sieve more uniformly stressed. Compared with the single-sided pressing in the patent with announcement number CN222738809U, the locking reliability is improved by more than 50%.

[0030] ② Flatness guarantee: Through real-time monitoring and adjustment of the horizontal calibration component 7, the sieve plate is ensured to form a flat plane, avoiding fluidized wear of the molecular sieve caused by uneven local compression. This feature solves the technical problems not covered in the patent announcement number CN309134300S.

[0031] ③ Simple operation: The anti-loosening component enables multiple pull rods 3 to be tightened simultaneously, which greatly reduces installation time and adjustment workload. Compared with the complex three-stage clamping system in the patent with announcement number CN202322514947U, the operation process of this method is reduced by more than 40%.

[0032] ④ Strong self-adaptability: The elastic compensation layer can adapt to the slight non-uniformity of the molecular sieve bed 5, ensuring uniform pressure distribution and extending the service life of the molecular sieve.

[0033] ⑤ Easy maintenance: The modular design makes it easy to disassemble and replace the components, reducing equipment downtime for maintenance.

[0034] The key features of this design are compared with those of the prior art as follows:

[0035]

[0036] This utility model also provides two embodiments, as follows:

[0037] Example 1:

[0038] This embodiment provides a method for locking sieve plates in vacuum pressure swing adsorption (PSA) oxygen generation, applied to an adsorption tower with a diameter of 1.2m, and includes the following steps:

[0039] ①Preparation before installation: Check the flatness of the upper screen plate 1 and the lower screen plate 2, and control the deviation within 0.1mm; attach a 5mm thick polyurethane elastic compensation layer to the contact surface between the upper and lower screen plates 2 and the molecular sieve; prepare 8 tie rods 3 with a diameter of 12mm, and process reverse threads at both ends of the tie rods 3.

[0040] ② Install the lower sieve plate 2 and tie rods 3: Place the lower sieve plate 2 at the predetermined position at the bottom of the adsorption tower; pass the lower ends of the 8 tie rods 3 through the mounting holes on the edge of the lower sieve plate 2 and use wedge-shaped anti-loosening nuts 9 to initially fix them; the tie rods 3 are evenly distributed along the circumference of the lower sieve plate 2, and the angle between adjacent tie rods 3 is 45 degrees.

[0041] ③ Filling the molecular sieve and installing the upper sieve plate 1: Fill the molecular sieve bed 5 in the adsorption tower to the predetermined height; place the upper sieve plate 1 on top of the molecular sieve bed 5, so that the upper end of the tie rod 3 passes through the corresponding mounting hole of the upper sieve plate 1.

[0042] ④ Install the calibration device: Evenly install four horizontal calibration components 7 along the perimeter of the inner wall of the adsorption tower; gently contact the upper surface of the edge of the upper sieve plate 1 with the horizontal calibration component 7; then activate the horizontal calibration component 7 and check the initial horizontal state of each point; the main components and functions of the horizontal calibration component 7 are as follows:

[0043]

[0044] ⑤ Synchronous tightening and horizontal calibration: Connect the anti-loosening components to the upper ends of each pull rod 3; activate the anti-loosening components, and tighten all pull rods 3 simultaneously, with the pre-tightening force controlled within the range of 5-8kN; observe the horizontal readings of each of the horizontal calibration components 7, and fine-tune the local height of the upper screen plate 1 by adjusting the pin 6 to ensure that the overall flatness error is less than 0.5mm; after reaching the predetermined pre-tightening force, use the wedge-shaped anti-loosening nuts 9 to lock all pull rods 3.

[0045] ⑥ Post-operation monitoring and adjustment: Install a tension sensor on tie rod 3 to monitor changes in preload in real time; during the initial operation of the equipment, check the levelness and preload every 24 hours; after the operation is stable, the inspection cycle can be extended to 720 hours.

[0046] Example 2:

[0047] The difference between this embodiment and Embodiment 1 is that:

[0048] The adsorption tower has a diameter of 2.5m, and the number of tie rods 3 is increased to 12 with a diameter of 16mm; 8 horizontal calibration components 7 are used, and the angle between adjacent components is 45 degrees; the elastic compensation layer is made of oil-resistant rubber material with a thickness of 8mm; the pre-tightening force is controlled within the range of 12-15kN.

[0049] This invention solves the technical problem of molecular sieve clamping in vacuum pressure swing adsorption (VPSA) oxygen generators by innovatively combining an upper and lower locking structure and a horizontal calibration component 7. Compared with existing technologies, this design has advantages such as reliable locking, high flatness, and simple operation, and is particularly suitable for large-scale industrial VPSA oxygen generators.

[0050] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A sieve plate locking structure for vacuum pressure swing adsorption oxygen generation, characterized in that, The device includes an upper sieve plate, a lower sieve plate, multiple tie rods, and an adsorption tower body. Both the upper and lower sieve plates have multiple threaded grooves on their outer edges. Each tie rod has an adjusting pin below it. From bottom to top, each tie rod has a horizontal calibration component, an anti-loosening component, a spring compensator, and a wedge-shaped anti-loosening nut arranged sequentially above it, with the spring compensator abutting against the anti-loosening component. Each tie rod has reverse threads at both ends. A molecular sieve bed is disposed within the adsorption tower body. The upper sieve plate is located at the top of the molecular sieve bed, and the lower sieve plate is located at the bottom of the molecular sieve bed. The multiple tie rods are threaded onto the outer edges of the upper and lower sieve plates, with the reverse threads located within the corresponding threaded grooves. The horizontal calibration component abuts against the upper end face of the upper sieve plate, and the adjusting pin abuts against the lower end face of the lower sieve plate.

2. The sieve plate locking structure for vacuum pressure swing adsorption oxygen generation as described in claim 1, characterized in that, The level calibration component is a bubble level or an electronic level sensor.

3. The sieve plate locking structure for vacuum pressure swing adsorption oxygen generation as described in claim 2, characterized in that, The wedge-shaped anti-loosening nut has an elastic washer and a double nut structure.

4. The sieve plate locking structure for vacuum pressure swing adsorption oxygen generation as described in claim 3, characterized in that, The anti-loosening component includes multiple stationary locking teeth, multiple movable locking teeth, and a mounting sleeve. Each movable locking tooth has a retaining spring at one end. The mounting sleeve has multiple mounting grooves. The multiple stationary locking teeth are fixedly connected to the pull rod and located on the outside of the pull rod. The multiple movable locking teeth are slidably connected to the mounting sleeve and located in the mounting grooves. The springs are located in the corresponding mounting grooves. The mounting sleeve is fitted onto the pull rod, and the multiple movable locking teeth abut against the corresponding stationary locking teeth.

5. The sieve plate locking structure for vacuum pressure swing adsorption oxygen generation as described in claim 4, characterized in that, The contact surfaces between the upper sieve plate and the molecular sieve bed, as well as the contact surfaces between the lower sieve plate and the molecular sieve bed, are all provided with elastic compensation layers.

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