A zero gas consumption PSA air separation nitrogen production device

Abstract

The present invention belongs to the field of gas separation technology, and specifically relates to a zero-gas-consumption PSA air separation nitrogen production device, including an adsorption tower, a top cover, an air outlet pipe, an air inlet pipe and a solenoid valve; a protective mechanism, the protective mechanism is arranged at the connection between the adsorption tower and the top cover; a backflush mechanism, the backflush mechanism is arranged at the upper end of the adsorption tower; a plugging mechanism, the plugging mechanism includes a plugging part arranged in the air outlet pipe, a resistance part is arranged on the plugging part, an adjusting part is arranged on the resistance part, and the pressure generated by the resistance part on the plugging part is adjusted by twisting the adjusting part; wherein, the protective mechanism includes an outer shell, the outer shell is composed of two shells, and a reinforcement part is arranged in an annular distribution in the outer shell, and a warning part and a linkage part are arranged on the reinforcement part. The present invention can realize an efficient zero-gas-consumption air separation nitrogen production process; at the same time, it has good safety protection measures to reduce gas leakage.

Description

Technical Field

[0001] The invention belongs to the technical field of gas separation, and in particular relates to a zero-gas-consumption PSA air separation nitrogen production device. Background Art

[0002] With the continuous development of industrial technology, the demand for high-purity nitrogen is increasing. As an important industrial gas, nitrogen is widely used in chemical, metallurgical, electronic, food processing and other industries. Although traditional nitrogen production methods such as cryogenic air separation can obtain high-purity nitrogen, they require large equipment investment, high operating costs, high energy consumption, and complex operations, making it difficult to meet the requirements of modern industry for high efficiency, low cost, miniaturization and environmental protection.

[0003] In recent years, Pressure Swing Adsorption (PSA) technology has attracted widespread attention due to its advantages such as low energy consumption, compact structure, and easy automation control. PSA technology uses the selective adsorption differences of specific adsorbents on each component in a gas mixture under different pressure conditions to achieve gas separation. However, traditional PSA nitrogen generation devices have certain limitations:

[0004] First, in order to ensure the effective regeneration of the carbon molecular sieve in the adsorption tower, it is usually necessary to use part of the produced pure nitrogen for purging. This practice increases the energy consumption of the system and causes a waste of nitrogen; at the same time, the current PSA system mostly uses a simple pressure reduction method to complete the regeneration process of the adsorption tower. This method easily leads to the residual impurities on the surface of the carbon molecular sieve not being completely removed, affecting the adsorption performance during subsequent recycling, thereby causing a waste of gas.

[0005] Secondly, since it involves gas processing under high-pressure environment, if the connection points cannot be effectively monitored and managed (such as the connection between the top of the adsorption tower and other components), it may cause safety hazards; in addition, leakage and other problems that may occur after long-term operation will also affect the stability and safety of the system and cause serious gas loss.

[0006] Furthermore, the gas treated by the air compressor is directly discharged after being adsorbed by the carbon molecular sieve. If the pressure in the adsorption tower is insufficient, it may mean that the adsorbent has not fully adsorbed impurities such as oxygen. At this time, the gas discharged from the nitrogen outlet pipe may contain a higher proportion of oxygen and other impurities, which will reduce the nitrogen purity of the final product; insufficient pressure may also lead to incomplete adsorption process, resulting in a reduction in the amount of gas passing through the adsorption tower, thereby affecting the total output of nitrogen. Summary of the invention

[0007] The purpose of the present invention is to provide a zero-gas-consumption PSA air separation nitrogen production device, which can realize an efficient zero-gas-consumption air separation nitrogen production process; at the same time, it has good safety protection measures to reduce gas leakage.

[0008] The technical solution adopted by the present invention is as follows:

[0009] A zero-gas-consumption PSA air separation nitrogen production device comprises two adsorption towers, the upper ends of the adsorption towers are connected to top covers, and the top covers are connected to gas outlet pipes;

[0010] A protection mechanism, wherein the protection mechanism is arranged at the connection between the adsorption tower and the top cover;

[0011] An air intake pipe, the air intake pipe is connected to the adsorption tower and is provided with a solenoid valve;

[0012] A backflush mechanism, which is disposed at the upper end of the adsorption tower and is used to desorb the adsorbed oxygen;

[0013] A blocking mechanism, the blocking mechanism comprising a blocking portion arranged in the air outlet pipe, the blocking portion being provided with a resisting portion, the resisting portion being provided with an adjusting portion, and the pressure exerted by the resisting portion on the blocking portion being adjusted by twisting the adjusting portion;

[0014] Wherein, the protection mechanism comprises an outer shell, which is composed of two shells. A reinforcement part is arranged in a ring shape inside the outer shell, and a warning part and a linkage part are arranged on the reinforcement part.

[0015] In a preferred embodiment, the reinforcement part includes a first hollow cylinder, which is connected to the outer shell in an annular shape, a first piston plate is slidably connected to the inside of the first hollow cylinder, a first compression spring is fixedly connected between the first piston plate and the first hollow cylinder, a second hollow cylinder is arranged next to the first hollow cylinder, and the second hollow cylinder is fixedly connected to the inner wall of the outer shell, a first piston rod is inserted into the lower end of the second hollow cylinder, a second piston plate is connected to the upper end of the first piston rod, a pressure block is fixedly connected to the other end of the first piston rod, a second compression spring is fixedly connected to the top surface of the second piston plate, and the upper end of the second compression spring is connected to the inner cavity of the second hollow cylinder, and an air pipe is connected between the first hollow cylinder and the second hollow cylinder.

[0016] In a preferred embodiment, the warning part includes a mounting frame, which is fixedly connected to the top surface of the outer shell, and a contact switch and a buzzer are installed on the upper end of the mounting frame, wherein the top surfaces of the two first piston plates are fixedly connected to the second piston rod, and the second piston rod is piston-connected to the first hollow cylinder and the outer shell, and a sliding groove is provided on the second piston rod, and a slider is slidably connected in the sliding groove, and a metal spring is fixedly connected to the bottom surface of the slider, and the lower end of the metal spring is connected to the bottom surface of the inner cavity of the sliding groove.

[0017] In a preferred embodiment, the linkage part includes a third piston rod, two of the third piston rods are respectively connected to the top surfaces of two of the first piston plates, and the third piston rod is piston-connected to the first hollow cylinder and the outer shell, and the upper end of the third piston rod is connected to a rack.

[0018] In a preferred embodiment, the back-blowing mechanism includes a turntable, which is rotatably connected to the inner wall of the adsorption tower, the inner ring of the turntable is fixedly connected to the connecting column by a support rod, the connecting column is provided with spoilers in a ring-shaped distribution, the adsorption tower is provided with jet pipes in a ring-shaped distribution, and multiple jet pipes are connected to air intake pipes, the inner wall of the adsorption tower is fixedly connected with a circular ring, the lower end of the circular ring is connected with a spring, the lower end of the spring is connected with a cover plate, and the cover plate is slidably connected to the inner wall of the adsorption tower, and the top surface of the turntable is provided with an arc plate in a ring-shaped distribution.

[0019] In a preferred embodiment, the blocking portion includes a sealing plate, which is rotatably connected to the inner wall of the air outlet pipe. The inner wall of the air outlet pipe is also fixedly connected to a transverse plate, and the transverse plate is in close contact with the sealing plate.

[0020] In a preferred embodiment, the resistance part includes a support seat, which is fixedly connected to the inner wall of the exhaust pipe by a support rod, and a rotating frame is hinged on the support seat, a sliding rod is slidably connected to the support seat, a fixed block is fixedly connected to the sliding rod, a first tension spring is connected between the sliding rod and the rotating frame, and a roller is rotatably connected to one end of the rotating frame.

[0021] In a preferred embodiment, the adjusting part includes a hollow tube, which is fixedly embedded in the air outlet pipe, and a threaded rod is threadedly connected to the hollow tube. A guide groove is provided on the inner wall of the hollow tube, and a guide plate is slidably connected in the guide groove, and the guide plate is rotatably connected to the threaded rod. A sliding rod is piston-type inserted into one end of the hollow tube, and one end of the sliding rod is fixedly connected to the guide plate, and the other end is fixedly connected to the fixed block. A third piston plate is fixedly sleeved on the outer wall of the sliding rod, and a hexagonal groove is provided at one end of the threaded rod, and a hexagonal column is inserted therein, and one end of the hexagonal column is connected to a gear, and the other end of the hexagonal column is connected to a second tension spring, and the other end of the second tension spring is connected to the hexagonal groove.

[0022] In a preferred embodiment, a connecting pipe is connected between the two adsorption towers, and a pressure equalizing valve is arranged on the connecting pipe. An exhaust pipe is also connected to the adsorption tower, and a valve is arranged on the exhaust pipe.

[0023] The technical effects achieved by the present invention are:

[0024] The present invention adopts a zero gas consumption design to avoid the process of using part of the produced pure nitrogen for purging in the traditional PSA nitrogen production device. This not only reduces the energy consumption of the system, but also effectively reduces the waste of nitrogen products. In addition, the regeneration process of the adsorption tower is assisted by pressure equalization operation, which further saves energy and improves the nitrogen recovery rate;

[0025] The present invention is equipped with multiple safety measures such as protective mechanisms, warning parts and linkage parts. When gas leakage is detected, these mechanisms can automatically tighten the connection, sound an alarm and adjust the internal pressure, thereby ensuring the stable operation of the equipment in a high-pressure environment, preventing potential safety hazards, and reducing the gas loss problem that may be caused by long-term operation;

[0026] The present invention utilizes the design of hot air backblowing and spoiler to realize a more thorough carbon molecular sieve desorption process, ensuring that impurities (such as oxygen, carbon dioxide and moisture) can be completely released from the adsorption material, thereby ensuring that the adsorption performance of subsequent recycling is not affected. At the same time, the blocking mechanism ensures that the outlet pipe is opened only under appropriate pressure conditions, which can avoid the problem of reduced purity or reduced output of product nitrogen due to insufficient air pressure in the adsorption tower, and ultimately improve the quality of the produced nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of a single adsorption tower of the present invention after the protective mechanism is disassembled;

[0029] Figure 3 It is a structural schematic diagram of the protection mechanism of the present invention;

[0030] Figure 4 The present invention Figure 3 A cross-sectional view of

[0031] Figure 5 The present invention Figure 3 An enlarged schematic diagram of part A shown in FIG.

[0032] Figure 6 is a cross-sectional view of the first hollow cylinder and the second hollow cylinder of the present invention;

[0033] Figure 7 It is a schematic diagram of the internal structure of the air outlet pipe of the present invention;

[0034] Figure 8 The present invention Figure 7 An enlarged schematic diagram of part B shown in;

[0035] Fig. 9 It is a structural schematic diagram of the regulating part of the present invention;

[0036] Fig.10 is a partial cross-sectional view of the adsorption tower of the present invention;

[0037] Fig.11 It is a schematic diagram of the overall structure of the turntable of the present invention.

[0038] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0039] 1. Adsorption tower; 2. Top cover; 3. Exhaust pipe; 4. Protection mechanism; 5. Inlet pipe; 6. Solenoid valve; 7. Backflush mechanism; 8. Blocking mechanism; 9. Connecting pipe; 10. Equalizing pressure valve; 11. Exhaust pipe;

[0040] 41. housing; 42. reinforcement part; 43. warning part; 44. linkage part;

[0041] 421, first hollow cylinder; 422, first piston plate; 423, first compression spring; 424, second hollow cylinder; 425, first piston rod; 426, second piston plate; 427, second compression spring; 428, air pipe; 429, pressure block;

[0042] 431, mounting frame; 432, contact switch; 433, buzzer; 434, second piston rod; 435, sliding groove; 436, slider; 437, metal spring;

[0043] 441, third piston rod; 442, rack;

[0044] 701, turntable; 702, connecting column; 703, spoiler; 704, jet pipe; 705, air intake duct; 706, ring; 707, spring; 708, cover plate; 709, curved plate;

[0045] 81. blocking part; 82. conflicting part; 83. regulating part;

[0046] 811, sealing plate; 812, horizontal plate;

[0047] 821, support seat; 822, rotating frame; 823, sliding rod; 824, fixed block; 825, first tension spring; 826, rotating roller;

[0048] 831. Hollow tube; 832. Threaded rod; 833. Guide groove; 834. Guide plate; 835. Sliding rod; 836. Third piston plate; 837. Hexagonal prism; 838. Gear; 839. Second tension spring. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0052] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0053] Please see attached Figures 1 to 11 As shown, this embodiment provides a zero-gas-consumption PSA air separation nitrogen production device, comprising two adsorption towers 1, the upper end of the adsorption tower 1 is connected to a top cover 2, the top cover 2 is connected to an outlet pipe 3, a connecting pipe 9 is connected between the two adsorption towers 1, the connecting pipe 9 is provided with a pressure equalizing valve 10, the adsorption tower 1 is also connected to an exhaust pipe 11, and the exhaust pipe 11 is provided with a valve;

[0054] A protection mechanism 4, which is arranged at the connection between the adsorption tower 1 and the top cover 2;

[0055] An air inlet pipe 5, which is connected to the adsorption tower 1 and is provided with a solenoid valve 6;

[0056] A back-flushing mechanism 7, which is disposed at the upper end of the adsorption tower 1 and is used to desorb the adsorbed oxygen;

[0057] The blocking mechanism 8 includes a blocking portion 81 disposed in the air outlet pipe 3, a resisting portion 82 is disposed on the blocking portion 81, and an adjusting portion 83 is disposed on the resisting portion 82. The pressure exerted by the resisting portion 82 on the blocking portion 81 is adjusted by twisting the adjusting portion 83;

[0058] The protection mechanism 4 includes a shell 41 , which is composed of two shells. A reinforcement part 42 is arranged in a ring shape inside the shell 41 , and a warning part 43 and a linkage part 44 are arranged on the reinforcement part 42 .

[0059] In this embodiment, an external compressor compresses the air in the atmosphere to a predetermined pressure and then sends it to a preset pretreatment system to remove impurities, and then it is transported to the left adsorption tower 1 through the air inlet pipe 5 (at this time, the solenoid valve 6 on the left is open, and the solenoid valve 6 on the right is closed). The oxygen in the air is captured by the adsorption material inside the adsorption tower 1 equipped with a carbon molecular sieve, and the remaining is mainly nitrogen. The nitrogen is then discharged through the outlet pipe 3 on the top cover 2 and stored in an external nitrogen storage tank. As time goes by, when the left adsorption tower 1 reaches saturation, it switches to the right adsorption tower 1 to continue the above process (at this time, the solenoid valve 6 on the left is closed, and the solenoid valve 6 on the right is opened). At the same time, the left adsorption tower 1 that has just exited work begins its regeneration phase.

[0060] When desorbing the saturated adsorption tower 1, the pressure equalizing valve 10 is opened, and the left adsorption tower 1 is connected with the right adsorption tower 1 through the pressure equalizing valve 10, and the pressure equalizing operation is started, that is, a short pressure balance is made between the left adsorption tower 1 and the right adsorption tower 1. This step helps to recover part of the nitrogen in the left adsorption tower 1, and provide a certain initial pressure and nitrogen content for the right adsorption tower 1, reducing energy consumption.

[0061] It should be noted that during the installation of the device, the two shells must be tightly connected together. The spliced ​​shell 41 needs to tightly wrap the upper end of the adsorption tower 1 and the lower end of the top cover 2 to ensure that the sealing of the entire device reaches the best state. This is done to prevent gas leakage from the shell 41, thereby ensuring the safety and reliability of the entire system.

[0062] Please refer again Figure 2 , Fig.10 and Fig.11 The back-blowing mechanism 7 includes a turntable 701, which is rotatably connected to the inner wall of the adsorption tower 1. The inner circle of the turntable 701 is fixedly connected to the connecting column 702 by a support rod. The connecting column 702 is provided with a spoiler 703 in an annular distribution. The adsorption tower 1 is provided with an injection pipe 704 in an annular distribution. The multiple injection pipes 704 are connected to an air intake pipe 705. The inner wall of the adsorption tower 1 is fixedly connected with a ring 706, and the lower end of the ring 706 is connected to a spring 707. The lower end of the spring 707 is connected to a cover plate 708, and the cover plate 708 is slidably connected to the inner wall of the adsorption tower 1. The top surface of the turntable 701 is provided with an arc plate 709 in an annular distribution.

[0063] In this embodiment, after the left adsorption tower 1 and the right adsorption tower 1 are pressure-equalized for three to five seconds, the valve on the exhaust pipe 11 is opened, and then hot air is delivered to the air intake pipe 705 through an external hot air blower. The hot air is ejected through multiple jet pipes 704, lifting the cover plate 708 and compressing the spring 707, and flows into the adsorption tower 1 through the gap between the cover plate 708 and the turntable 701, moves downward along the adsorption tower 1, and is finally discharged from the exhaust pipe 11. At this time, the air pressure in the adsorption tower 1 is reduced to normal pressure, so that the oxygen, carbon dioxide and moisture adsorbed by the carbon molecular sieve are released from the carbon molecular sieve and discharged from the exhaust pipe 11 with the hot air.

[0064] In addition, the inclined setting of the jet pipe 704 allows the ejected hot air to act on the arc plate 709, prompting the turntable 701 to start rotating. The rotation of the turntable 701 drives the rotation of the spoiler 703. The hot air changes the air flow direction through the spoiler 703 during the descent process to achieve the diffusion of the hot air. The diffused hot air fully contacts the carbon molecular sieve and is heated to a certain temperature, reducing the affinity of the carbon molecular sieve for oxygen and promoting the desorption of oxygen from the carbon molecular sieve. In this process, the adsorbed oxygen molecules are removed by directly introducing external air for reverse purge, thereby reducing the waste of produced nitrogen.

[0065] When compressed gas is injected into the adsorption tower 1 to produce nitrogen, the cover plate 708 covers the turntable 701, and the outer ring of the cover plate 708 fits tightly against the inner wall of the adsorption tower 1, ensuring that the internal air cannot be discharged along the injection pipe 704, thereby avoiding gas leakage.

[0066] The bottom surface of the cover plate 708 is connected to a rotating ring by rotation, and the rotating ring is fitted with the upper end of the rotating disk 701. Such a design can effectively reduce the friction between the cover plate 708 and the rotating disk 701, thereby ensuring that the rotating disk 701 can maintain smoothness during the rotation process, and avoiding the normal operation of the device being affected by excessive friction.

[0067] Please refer again Figure 7 The blocking portion 81 includes a sealing plate 811 rotatably connected to the inner wall of the air outlet pipe 3 . The inner wall of the air outlet pipe 3 is also fixedly connected with a transverse plate 812 , and the transverse plate 812 fits the sealing plate 811 .

[0068] Please refer again Figure 8 The resistance part 82 includes a support seat 821, which is fixedly connected to the inner wall of the exhaust pipe 3 by a support rod, a rotating frame 822 is hinged on the support seat 821, a sliding rod 823 is slidably connected to the support seat 821, a fixed block 824 is fixedly connected to the sliding rod 823, a first tension spring 825 is connected between the sliding rod 823 and the rotating frame 822, and a roller 826 is rotatably connected to one end of the rotating frame 822.

[0069] In this embodiment, when the compressed air just enters the adsorption tower 1, the sealing plate 811 cannot be pushed to rotate due to the low air pressure inside the adsorption tower 1. At this time, the two sealing plates 811 merge and fit the horizontal plate 812, completely sealing the outlet pipe 3 to prevent the gas from flowing out along the outlet pipe 3, avoiding the reduction of the purity and output of the produced nitrogen due to insufficient air pressure in the adsorption tower 1, and reducing gas waste. With the continuous input of compressed air, the air pressure in the adsorption tower 1 gradually increases. When the air pressure increases to a certain level, the sealing plate 811 is pushed to rotate, and the nitrogen produced is then discharged from the gap between the two sealing plates 811. The rotation of the sealing plate 811 pushes the roller 826 to move, causing one end of the rotating frame 822 to rise, while the other end of the rotating frame 822 moves away from the sliding rod 823 and stretches the first tension spring 825.

[0070] Please refer again Fig. 9 The regulating part 83 includes a hollow tube 831, which is fixedly embedded in the air outlet pipe 3. A threaded rod 832 is threadedly connected to the hollow tube 831. A guide groove 833 is provided on the inner wall of the hollow tube 831. A guide plate 834 is slidably connected in the guide groove 833, and the guide plate 834 is rotatably connected to the threaded rod 832. A sliding rod 835 is piston-type inserted at one end of the hollow tube 831, and one end of the sliding rod 835 is fixedly connected to the guide plate 834, and the other end is fixedly connected to the fixed block 824. A third piston plate 836 is fixedly sleeved on the outer wall of the sliding rod 835. A hexagonal groove is provided at one end of the threaded rod 832, and a hexagonal column 837 is inserted therein. A gear 838 is connected to one end of the hexagonal column 837, and a second tension spring 839 is connected to the other end of the hexagonal column 837, and the other end of the second tension spring 839 is connected to the hexagonal groove.

[0071] In this embodiment, the operator first pulls the gear 838 outward to disengage the gear 838 from the rack 442, and then rotates the gear 838 to drive the hexagonal prism 837 to rotate. The rotation of the hexagonal prism 837 drives the threaded rod 832 to rotate. The rotation of the threaded rod 832 drives the guide plate 834 and the slide bar 835 to move. The movement of the slide bar 835 drives the fixed block 824 to move. The movement of the fixed block 824 in turn moves the slide bar 823 to stretch the first tension spring 825. When the first tension spring 825 is stretched longer, the sealing plate 811 is more difficult to rotate, so a greater air pressure is required to push the sealing plate 811 to move; conversely, when the first tension spring 825 is stretched shorter, the sealing plate 811 is easier to rotate, so a smaller air pressure is required to push the sealing plate 811 to rotate. By adjusting the stretching length of the first tension spring 825, the size of the air pressure inside the adsorption tower 1 can be adjusted to meet the needs of nitrogen production in different environments.

[0072] It should be noted that the slide rod 835 is inserted into the hollow tube 831 in a piston-like manner, and a sealing ring is provided at the insertion point, and a third piston plate 836 is also sleeved on the slide rod 835 to prevent gas leakage.

[0073] Next, please refer to Figure 4 and Figure 5 The reinforcement part 42 includes a first hollow cylinder 421, which is connected to the outer shell 41 in an annular shape, and a first piston plate 422 is slidably connected to the first hollow cylinder 421, and a first compression spring 423 is fixedly connected between the first piston plate 422 and the first hollow cylinder 421, a second hollow cylinder 424 is arranged beside the first hollow cylinder 421, and the second hollow cylinder 424 is fixedly connected to the inner wall of the outer shell 41, a first piston rod 425 is inserted at the lower end of the second hollow cylinder 424, and a second piston plate 426 is connected to the upper end of the first piston rod 425, and a pressure block 429 is fixedly connected to the other end of the first piston rod 425, a second compression spring 427 is fixedly connected to the top surface of the second piston plate 426, and the upper end of the second compression spring 427 is connected to the inner cavity of the second hollow cylinder 424, and an air supply pipe 428 is connected between the first hollow cylinder 421 and the second hollow cylinder 424.

[0074] In this embodiment, when gas leakage occurs at the connection between the adsorption tower 1 and the top cover 2, the gas pressure in the housing 41 gradually increases, and then the first piston plate 422 is pushed to move along the first hollow cylinder 421 to compress the internal air and the first compression spring 423. The compressed air enters the second hollow cylinder 424 along the gas pipe 428, pushing the second piston plate 426 to move, and the movement of the second piston plate 426 drives the first piston rod 425 and the pressure block 429 to move. The more gas leaks, the greater the pressure formed by the upper and lower corresponding pressure blocks 429, and the connection is tightened by the upper and lower corresponding pressure blocks 429 to reduce gas leakage.

[0075] Secondly, please also refer to Figure 5 and Figure 6 The warning part 43 includes a mounting frame 431, which is fixedly connected to the top surface of the shell 41. A contact switch 432 and a buzzer 433 are installed on the upper end of the mounting frame 431, wherein the top surfaces of the two first piston plates 422 are fixedly connected to the second piston rod 434, and the second piston rod 434 is piston-type plugged with the first hollow cylinder 421 and the shell 41, and a sliding groove 435 is opened on the second piston rod 434, and a slider 436 is slidably connected in the sliding groove 435, and a metal spring 437 is fixedly connected to the bottom surface of the slider 436, and the lower end of the metal spring 437 is connected to the bottom surface of the inner cavity of the sliding groove 435.

[0076] In this embodiment, when two of the first piston plates 422 move upward, they will drive the second piston rod 434 to move upward. The upward movement of the second piston rod 434 drives the slider 436 to move upward. The slider 436 moves upward and contacts the contact switch 432. Then the buzzer 433 turns on to alert surrounding staff of gas leakage.

[0077] It should be noted that when the second piston rod 434 continues to move upward, the slider 436 is blocked by the contact switch 432 and cannot move upward. At this time, the slider 436 will move along the sliding groove 435 and squeeze the metal spring 437, so it will not affect the normal movement of the second piston rod 434.

[0078] Next, please refer to Figure 3 The linkage part 44 includes a third piston rod 441. The two third piston rods 441 are respectively connected to the top surfaces of two of the first piston plates 422, and the third piston rod 441 is piston-type plugged with the first hollow cylinder 421 and the outer shell 41. The upper end of the third piston rod 441 is connected to a rack 442.

[0079] In this embodiment, when two of the first piston plates 422 move upward, the third piston rod 441 will be driven to move upward, and the upward movement of the third piston rod 441 will drive the rack 442 to move upward. The rack 442 is meshed with the gear 838, causing the gear 838 to rotate, thereby driving the threaded rod 832 to rotate. The rotation of the threaded rod 832 drives the slide bar 835 to move. The movement of the slide bar 835 adjusts the position of the slide bar 823, so that the stretched length of the first tension spring 825 is reduced, so that a smaller air pressure can push the sealing plate 811 to rotate, so that the air in the adsorption tower 1 is discharged along the air outlet pipe 3, so as to reduce the air pressure in the adsorption tower 1 and avoid excessive air pressure causing the looseness to be aggravated.

[0080] It should be noted that the spiral directions of the left and right threaded rods 832 are opposite.

[0081] The working principle of the present invention is:

[0082] Air compression and pretreatment:

[0083] An external compressor compresses the air in the atmosphere to a predetermined pressure and sends it to a preset pretreatment system to remove impurities.

[0084] Selective adsorption:

[0085] The pre-treated air is delivered to two alternately working adsorption towers 1 through an air inlet pipe 5. Each adsorption tower 1 is equipped with carbon molecular sieves, which have a high affinity for oxygen.

[0086] When air enters an adsorption tower 1, oxygen therein is captured by the carbon molecular sieve, while nitrogen is discharged as product gas through the outlet pipe 3 on the top cover 2 and stored.

[0087] Switching and regeneration:

[0088] As time goes by, when one adsorption tower 1 reaches the saturation point, it will switch to another adsorption tower 1 to continue the above process.

[0089] For the saturated adsorption tower 1 , its regeneration phase begins: the pressure equalizing valve 10 is opened to briefly connect the two adsorption towers 1 to balance the pressure, which helps to recover part of the nitrogen and provide initial pressure for the newly started adsorption tower 1 .

[0090] Desorption process:

[0091] During the regeneration stage, hot air is delivered to the adsorption tower 1 through an external hot air blower. The hot air ejected through the jet pipe 704 causes the turntable 701 to rotate, driving the spoiler 703 to rotate, thereby achieving hot air diffusion and full contact with the carbon molecular sieve.

[0092] The heating reduces the adsorption capacity of the carbon molecular sieve to impurities such as oxygen, so that they are released from the carbon molecular sieve and discharged from the exhaust pipe 11 together with the hot air.

[0093] Backflush Clear:

[0094] The back-flushing mechanism 7 directly introduces outside air for reverse flushing, thereby further removing the adsorbed oxygen molecules and avoiding the waste of produced nitrogen.

[0095] Sealing and adjustment mechanism:

[0096] The blocking mechanism 8 ensures that the gas outlet pipe 3 is opened or closed at an appropriate pressure, thereby ensuring the quality and output of the produced nitrogen.

[0097] The adjustment part 83 allows the operator to adjust the stretching length of the first tension spring 825 to control the working gas pressure in the adsorption tower 1 to meet different nitrogen production requirements.

[0098] Safety protection and warning:

[0099] The protection mechanism 4 ensures the sealing of the connection between the adsorption tower 1 and the top cover 2 to prevent gas leakage; and is provided with a reinforcement part 42, a warning part 43 and a linkage part 44, which can automatically tighten the connection, sound an alarm and automatically reduce the pressure in the adsorption tower 1 when a leakage is detected.

[0100] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A zero gas consumption PSA air separation nitrogen production device, characterized in that: It comprises two adsorption towers (1), the upper end of each adsorption tower (1) is connected to a top cover (2), and the top cover (2) is connected to an air outlet pipe (3); A protection mechanism (4), wherein the protection mechanism (4) is arranged at the connection between the adsorption tower (1) and the top cover (2); An air intake pipe (5), the air intake pipe (5) being connected to the adsorption tower (1), and a solenoid valve (6) being provided on the air intake pipe (5); A backflush mechanism (7), the backflush mechanism (7) being arranged at the upper end of the adsorption tower (1) and being used for desorbing the adsorbed oxygen; A blocking mechanism (8), the blocking mechanism (8) comprising a blocking portion (81) arranged in the air outlet pipe (3), a resisting portion (82) being arranged on the blocking portion (81), an adjusting portion (83) being arranged on the resisting portion (82), and the pressure exerted by the resisting portion (82) on the blocking portion (81) being adjusted by twisting the adjusting portion (83); The protection mechanism (4) comprises a housing (41), the housing (41) being composed of two shells, a reinforcement portion (42) being arranged in an annular shape inside the housing (41), and a warning portion (43) and a linkage portion (44) being arranged on the reinforcement portion (42); The reinforcement portion (42) comprises a first hollow cylinder (421), the first hollow cylinder (421) is connected in an annular shape in the housing (41), a first piston plate (422) is slidably connected in the first hollow cylinder (421), a first compression spring (423) is fixedly connected between the first piston plate (422) and the first hollow cylinder (421), a second hollow cylinder (424) is arranged beside the first hollow cylinder (421), and the second hollow cylinder (424) is fixedly connected to the inner wall of the housing (41), a first piston rod (425) is inserted at the lower end of the second hollow cylinder (424), the upper end of the first piston rod (425) is connected to the second piston plate (426), the other end of the first piston rod (425) is fixedly connected to a pressure block (429), and the The top surface of the second piston plate (426) is fixedly connected to a second compression spring (427), and the upper end of the second compression spring (427) is connected to the inner cavity of the second hollow cylinder (424). An air pipe (428) is connected between the first hollow cylinder (421) and the second hollow cylinder (424). When gas leakage occurs at the connection between the adsorption tower (1) and the top cover (2), the air pressure pushes the first piston plate (422) to move along the first hollow cylinder (421) and compresses the internal air. The compressed air enters the second hollow cylinder (424) along the air pipe (428) and pushes the second piston plate (426) to move. The movement of the second piston plate (426) drives the first piston rod (425) and the pressure block (429) to move, and the connection is tightened by the upper and lower corresponding pressure blocks (429); The warning part (43) comprises a mounting frame (431), wherein the mounting frame (431) is fixedly connected to the top surface of the housing (41), and a contact switch (432) and a buzzer (433) are installed on the upper end of the mounting frame (431), wherein the top surfaces of the two first piston plates (422) are fixedly connected to second piston rods (434), and the second piston rods (434) are piston-plugged with the first hollow cylinder (421) and the housing (41), and a sliding groove (435) is provided on the second piston rod (434), and a sliding block (436) is slidably connected in the sliding groove (435), and a metal spring (437) is fixedly connected to the bottom surface of the sliding block (436), and the lower end of the metal spring (437) is connected to the bottom surface of the inner cavity of the sliding groove (435); The linkage part (44) comprises a third piston rod (441), two third piston rods (441) are respectively connected to the top surfaces of two of the first piston plates (422), and the third piston rods (441) are piston-type plugged with the first hollow cylinder (421) and the outer shell (41), and the upper end of the third piston rod (441) is connected to a rack (442); The blocking portion (81) comprises a sealing plate (811), the sealing plate (811) being rotatably connected to the inner wall of the air outlet pipe (3), the inner wall of the air outlet pipe (3) being further fixedly connected to a transverse plate (812), and the transverse plate (812) being in close contact with the sealing plate (811); The abutment portion (82) comprises a support seat (821), the support seat (821) being fixedly connected to the inner wall of the air outlet pipe (3) by means of a support rod, a rotating frame (822) being hingedly connected to the support seat (821), a sliding rod (823) being slidably connected to the support seat (821), a fixed block (824) being fixedly connected to the sliding rod (823), a first tension spring (825) being connected between the sliding rod (823) and the rotating frame (822), and a rotating roller (826) being rotatably connected to one end of the rotating frame (822); The regulating portion (83) comprises a hollow tube (831), the hollow tube (831) being fixedly mounted on the air outlet pipe (3), a threaded rod (832) being threadedly connected to the hollow tube (831), a guide groove (833) being provided on the inner wall of the hollow tube (831), a guide plate (834) being slidably connected in the guide groove (833), and the guide plate (834) being rotatably connected to the threaded rod (832), a sliding rod (835) being piston-type plugged into one end of the hollow tube (831), and the sliding rod One end of (835) is fixedly connected to the guide plate (834), and the other end is fixedly connected to the fixed block (824); the outer wall of the sliding rod (835) is fixedly sleeved with a third piston plate (836); one end of the threaded rod (832) is provided with a hexagonal groove, and a hexagonal column (837) is inserted therein; one end of the hexagonal column (837) is connected to a gear (838); the other end of the hexagonal column (837) is connected to a second tension spring (839), and the other end of the second tension spring (839) is connected to the hexagonal groove.

2. A zero-gas-consumption PSA air separation nitrogen production device according to claim 1, characterized in that: The back-blowing mechanism (7) comprises a rotating disk (701), wherein the rotating disk (701) is rotatably connected to the inner wall of the adsorption tower (1), the inner ring of the rotating disk (701) is fixedly connected to the connecting column (702) by means of a supporting rod, the connecting column (702) is provided with a spoiler (703) in an annular arrangement, the adsorption tower (1) is provided with an injection pipe (704) in an annular arrangement, and a plurality of the injection pipes (704) are connected to an air intake pipe (705), the inner wall of the adsorption tower (1) is fixedly connected with a circular ring (706), the lower end of the circular ring (706) is connected with a spring (707), the lower end of the spring (707) is connected with a cover plate (708), and the cover plate (708) is slidably connected to the inner wall of the adsorption tower (1), and the top surface of the rotating disk (701) is provided with an arc plate (709) in an annular arrangement.

3. The zero-gas-consumption PSA air separation nitrogen production device according to claim 1, characterized in that: A connecting pipe (9) is connected between the two adsorption towers (1), and a pressure equalizing valve (10) is provided on the connecting pipe (9). An exhaust pipe (11) is also connected to the adsorption tower (1), and a valve is provided on the exhaust pipe (11).

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