Liquid nitrogen subcooler and method suitable for ultra-pure nitrogen production

Abstract

The invention discloses a liquid nitrogen subcooler and method suitable for ultra-pure nitrogen production, and relates to the technical field of liquid nitrogen subcoolers. The liquid nitrogen subcooler suitable for ultra-pure nitrogen production comprises a heat preservation tank, a subcooling pipeline is installed in the center of the interior of the heat preservation tank, a material inlet and a liquid nitrogen inlet are formed in the top of the heat preservation tank, the upper end of the subcooling pipeline is connected with the liquid nitrogen inlet, and a stirring adjusting mechanism is installed at the bottom end of the interior of the heat preservation tank. A cleaning mechanism is installed at the center position of the supercooling pipeline, the stirring adjusting mechanism comprises a first rotating disc, a gear A is installed at the center position of the first rotating disc through an elastic reset assembly, a gear B is connected to the tooth surface of one side of the gear A in a meshed mode, and a sliding groove body is formed in the periphery of the surface of the upper end of the first rotating disc; and a stirring rod is arranged in the sliding groove body in a limited sliding manner, so that internal materials are uniformly supercooled, and meanwhile, the refrigeration effect of the supercooler is effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of liquid nitrogen supercoolers, and in particular to a liquid nitrogen supercooler and a method suitable for producing ultrapure nitrogen. Background Art

[0002] With the rapid development of China's economy, industrial gases, as one of the basic industrial elements of the national economy, have become increasingly prominent in the national economy. Especially with the advent of the Internet era, the electronics, polysilicon and other industries have emerged widely, and the demand for high-purity gases has increased. Among them, nitrogen is a more common gas in industrial gases. It is usually used in certain inert atmospheres for metal treatment and in light bulbs to prevent arcing, but it is not chemically inert. It is an essential element in animal and plant life and a component of many useful compounds. Nitrogen combines with many metals to form hard nitrides, which can be used as wear-resistant metals.

[0003] When preparing ultra-pure nitrogen, it is necessary to compress industrial nitrogen (99.9%) to 0.5~1MPa, pre-cool it to below -50℃, remove most of the water and CO2, and adsorb the residual H2O, CO2 and hydrocarbons through molecular sieves or activated carbon. Then use a high-pressure tower to initially separate nitrogen (boiling point -196℃) from oxygen (boiling point -183℃) and argon (boiling point -186℃), and then further purify it through a low-pressure tower. Nitrogen is discharged from the top of the tower, and oxygen / argon is enriched at the bottom of the tower. Finally, the liquid nitrogen after distillation enters the subcooler, the temperature drops to -203℃, and the residual O2, CH4, etc. are solidified and precipitated, and then intercepted and filtered through a filter to obtain ultra-pure nitrogen.

[0004] However, when the existing liquid nitrogen supercooler further purifies the ultra-pure nitrogen, it is necessary to reduce the temperature of the ultra-pure nitrogen to -203°C, so that the residual impurities such as O2 and CH4 are solidified and precipitated, and attached to the pipeline of the liquid nitrogen supercooler, resulting in poor refrigeration effect of the supercooler. At the same time, the existing liquid nitrogen supercooler uses serpentine pipelines as heat exchange medium, but the supercooling effect is very limited. The supercooling rate is fast close to the serpentine pipeline, while the supercooling rate is slow away from the serpentine pipeline, resulting in uneven supercooling.

[0005] In view of the above problems, it is urgent to innovate based on the original liquid nitrogen supercooler. Summary of the invention

[0006] The object of the present invention is to provide a liquid nitrogen subcooler and method suitable for ultrapure nitrogen production, so as to solve the technical problems raised by the above-mentioned background technology and provide a solution significantly different from the prior art.

[0007] To achieve the above object, the present invention provides the following technical solutions: a liquid nitrogen subcooler and method suitable for ultrapure nitrogen production, comprising an insulation tank body, a subcooling pipeline is installed at the center of the insulation tank body, a material inlet and a liquid nitrogen inlet are arranged on the top of the insulation tank body, the upper end of the subcooling pipeline is connected to the liquid nitrogen inlet, a stirring adjustment mechanism is installed at the bottom of the insulation tank body, and a cleaning mechanism is installed at the center of the subcooling pipeline; The stirring and adjusting mechanism includes a first rotating disk, which is rotatably connected to the bottom end of the heat-insulating tank body through a bearing, a gear A is installed at the center position of the first rotating disk through an elastic reset component, and a gear B is meshed with a tooth surface on one side of the gear A, and the gear B is arranged on the periphery of the bottom end of the supercooling pipeline through a bearing sleeve, and a tooth surface on one end of the gear B is meshed with an annular rack inside the first rotating disk, a sliding groove body is opened around the upper end surface of the first rotating disk, a stirring rod is limitedly slid in the sliding groove body, and the stirring rod is limitedly installed inside the heat-insulating tank body through a limit adjustment component.

[0008] Preferably, the elastic reset assembly includes a device shell, which is installed at the bottom end of the heat-insulating tank body through a driving motor. A push rod is installed in the device shell through a spring limiter, and the upper end of the push rod is fixedly connected to the bottom of gear A.

[0009] Preferably, the limit adjustment assembly includes a second rotating disk, which is fixedly mounted in the middle section of the insulation tank body. A through adjustment groove is opened around the surface of the second rotating disk corresponding to the sliding groove body. A spur rack is provided on one side wall of the through adjustment groove. The middle section of the stirring rod passes through the through adjustment groove and is equipped with a gear C, and the tooth surface of the gear C is meshed with the spur rack.

[0010] Preferably, the cleaning mechanism includes a sliding rod, which is installed in the middle of the supercooling pipeline through an electric push rod bearing on the top of the insulation tank body, and limiting grooves are provided on both sides of the outer periphery of the sliding rod. A slider is sleeved on the outer periphery of the sliding rod, and the slider slides on the surface of the sliding rod in a limited manner through an internal protrusion cooperating with the limiting groove. A cleaning block is fixedly connected to one side of the middle section of the slider, and one side of the cleaning block is sleeved on the outer periphery of the supercooling pipeline. Flexible bristles are provided on the contact surface between the cleaning block and the outer periphery of the supercooling pipeline, and the supercooling pipeline is arranged as a spiral structure.

[0011] Preferably, the sliding groove body is provided as an arc-shaped structure, and the sliding groove body rotates along with the first rotating disk to drive the middle part of the stirring rod to move back and forth in the penetrating adjustment groove.

[0012] Preferably, a resistance block is provided at the bottom of the sliding groove body along the arc structure direction, and the resistance block is set as an inclined structure with an inclined surface facing upward, and the stirring rod moves up and down in contact with the inclined surface of the resistance block as the first rotating disk rotates.

[0013] Preferably, a limit block is provided on one side of the outer periphery of the bottom end of the sliding rod, and a clamping groove is provided on the upper end surface of the gear A corresponding to the limit block.

[0014] Preferably, a liquid nitrogen outlet and a material outlet are respectively provided at the bottom of the heat-insulating tank body, the liquid nitrogen outlet is connected to the lower end of the supercooling pipeline, and a controller is provided on one side of the outer periphery of the heat-insulating tank body.

[0015] Preferably, the method comprises the following steps: S1: First, the preliminarily purified ultrapure nitrogen is introduced into the heat preservation tank, and then the high-pressure gasified liquid nitrogen is introduced into the supercooling pipeline to cool the ultrapure nitrogen and solidify and precipitate the residual impurities; S2: The ultrapure nitrogen in the heat preservation tank is stirred in all directions through the cooperation of the first rotating disk, gear A, gear B, stirring rod and limit adjustment assembly; S3: Start the electric push rod to push the sliding rod against the elastic reset component, so that the tooth surface of gear A is separated from the tooth surface of gear B, and the limit block is inserted into the clamping groove; S4: Start the driving motor to drive the sliding rod to rotate, cooperate with the cleaning block to slide along the surface of the supercooling pipeline, and use the flexible brush to clean the surface of the supercooling pipeline.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention is provided with a first rotating disk, a gear A, a gear B, a sliding trough body, a stirring rod and a limit adjustment component. The gear A is driven by a driving motor to rotate, thereby driving the gear B to rotate, thereby driving the first rotating disk to rotate, so that the bottom of the stirring rod slides inside the sliding trough body, and under the action of the limit adjustment component, the stirring rod moves back and forth in all directions and rotates, and at the same time moves up and down under the action of the resistance block at the bottom of the sliding trough body, so that the material in the insulation tank body is stirred in multiple directions, so that the material inside it is evenly supercooled, avoiding the problem that the supercooling rate of the material close to the serpentine pipeline is fast, and the supercooling rate of the material far away from the serpentine pipeline is slow.

[0017] The present invention is provided with a sliding rod, a limiting groove, a slider, a cleaning block and an elastic reset component. The sliding rod is pushed downward by an electric push rod arranged on the top of the heat-insulating tank body to resist the gear A, so that the bottom of the gear A compresses the elastic reset component downward until the tooth surface of the gear A is disengaged from the tooth surface of the gear B. Then the driving motor drives the gear A to rotate, so that the limiting block on the outer side of the bottom end of the sliding rod is inserted into the clamping groove on the top surface of the gear A. At this time, the sliding rod rotates with the rotation of the gear A, thereby driving the cleaning block to move along the periphery of the supercooling pipeline, and cooperates with the flexible bristles inside the cleaning block to clean the impurities attached to the supercooling pipeline, so as to avoid the problem of poor refrigeration effect of the supercooler caused by excessive attachment of impurities, thereby effectively ensuring the refrigeration effect of the supercooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the internal structure of the present invention; Figure 3 It is a schematic diagram of the top view of the structure of the second rotating disk of the present invention; Figure 4 It is a top view schematic diagram of the first rotating disk structure of the present invention; Figure 5 It is a schematic diagram of the local structure of the stirring and adjusting mechanism of the present invention; Figure 6 It is a schematic diagram of the partial structure of the cleaning mechanism of the present invention; Figure 7 It is a schematic diagram of the local structure of the elastic reset assembly of the present invention; Figure 8 For the present invention Figure 2 Enlarged structural diagram at A in the middle.

[0019] In the figure: 1. Insulated tank body; 2. Supercooling pipeline; 31. First rotating disk; 321. Device housing; 322. Spring; 323. Push rod; 33. Gear A; 34. Gear B; 35. Sliding groove body; 36. Stirring rod; 371. Second rotating disk; 372. Through-adjusting groove; 373. Straight rack; 374. Gear C; 41. Sliding rod; 42. Limiting groove; 43. Sliding block; 44. Cleaning block; 5. Resistance block; 6. Limiting block; 7. Card-connecting groove; 8. Controller. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 8 The present invention provides a technical solution: a liquid nitrogen supercooler and method suitable for ultrapure nitrogen production, comprising an insulation tank body 1, a supercooling pipeline 2 is installed at the center position of the insulation tank body 1, a material inlet and a liquid nitrogen inlet are arranged at the top of the insulation tank body 1, a liquid nitrogen outlet and a material outlet are respectively arranged at the bottom of the insulation tank body 1, the liquid nitrogen outlet is connected to the lower end of the supercooling pipeline 2, a controller 8 is arranged on one side of the outer periphery of the insulation tank body 1, the upper end of the supercooling pipeline 2 is connected to the liquid nitrogen inlet, a stirring adjustment mechanism is installed at the bottom end of the insulation tank body 1, and a cleaning mechanism is installed at the center position of the supercooling pipeline 2; As an embodiment of the present invention, the stirring and adjusting mechanism includes a first rotating disk 31, which is rotatably connected to the bottom end of the heat-insulating tank body 1 through a bearing. A gear A33 is installed at the center position of the first rotating disk 31 through an elastic reset component. One side tooth surface of the gear A33 is meshed with a gear B34. The gear B34 is arranged on the periphery of the bottom end of the supercooling pipeline 2 through a bearing sleeve. The tooth surface of one end of the gear B34 is meshed with the annular rack inside the first rotating disk 31. A sliding groove body 35 is opened around the upper end surface of the first rotating disk 31. The sliding groove body 35 is opened as an arc structure. A stirring rod 36 is limitedly slid in the sliding groove body 35. The stirring rod 36 is limitedly installed in the heat-insulating tank body 1 through a limit adjustment component. The driving motor is started by the controller 8 to drive the gear A33 to rotate and drive the gear B34 to rotate, thereby driving the first rotating disk 31 to rotate, so that the bottom of the stirring rod 36 slides inside the sliding groove body 35.

[0022] As an embodiment of the present invention, the elastic reset component includes a device shell 321, which is installed at the bottom end of the heat preservation tank body 1 through a driving motor. A push rod 323 is installed in the device shell 321 through a spring 322. The upper end of the push rod 323 is fixedly connected to the bottom of the gear A33. The electric push rod 323 is started by the controller 8 to push the sliding rod 41 downward to resist the gear A33, so that the gear A33 pushes the push rod 323 downward, thereby compressing the spring 322 in the device shell 321 until the tooth surface of the gear A33 is completely separated from the tooth surface of the gear B34.

[0023] As an embodiment of the present invention, the limit adjustment component includes a second rotating disk 371, which is fixedly installed in the middle section of the inner part of the heat preservation tank body 1. A through adjustment groove 372 is opened on the surface of the second rotating disk 371 corresponding to the sliding groove body 35. A straight rack 373 is provided on one side wall of the inner part of the through adjustment groove 372. The middle section of the stirring rod 36 passes through the through adjustment groove 372 and is installed with a gear C374. The tooth surface of the gear C374 is meshed with the straight rack 373. The stirring rod 36 moves back and forth around under the action of the through adjustment groove 372 on the second rotating disk 371. At this time, the gear C374 in the middle section of the stirring rod 36 rotates while moving back and forth under the action of the straight rack 373 on the inner wall of the through adjustment groove 372. At the same time, the bottom of the stirring rod 36 moves up and down under the action of the resistance block 5 in the sliding groove body 35, so as to stir the ultra-pure nitrogen in the heat preservation tank body 1 in all directions.

[0024] As an embodiment of the present invention, the cleaning mechanism includes a sliding rod 41, which is installed in the middle of the supercooling pipeline 2 through the electric push rod 323 bearing on the top of the insulation tank body 1. Limiting grooves 42 are provided on both sides of the outer periphery of the sliding rod 41, and a slider 43 is sleeved on the outer periphery of the sliding rod 41. The slider 43 slides on the surface of the sliding rod 41 through the internal protrusion and the limiting groove 42. A cleaning block 44 is fixedly connected to one side of the middle section of the slider 43. One side of the cleaning block 44 is sleeved on the outer periphery of the supercooling pipeline 2. Flexible bristles are provided on the contact surface of the cleaning block 44 with the outer periphery of the supercooling pipeline 2. The supercooling pipeline 2 is set as a spiral structure. The sliding rod 41 will rotate with the rotation of the gear A33, thereby driving the cleaning block 44 to move along the outer periphery of the supercooling pipeline 2. Since the supercooling pipeline 2 is a serpentine curved structure, the slider 43 moves back and forth on the sliding rod 41, and impurities attached to the supercooling pipeline 2 are cleaned by the flexible bristles.

[0025] As an embodiment of the present invention, a resistance block 5 is provided at the bottom of the sliding groove body 35 along the direction of the arc structure, and the resistance block 5 is set as an inclined structure with the inclined surface facing upward. The stirring rod 36 moves up and down as the first rotating disk 31 rotates and contacts with the inclined surface of the resistance block 5. A limit block 6 is provided on one side of the outer periphery of the bottom end of the sliding rod 41, and a snap-in groove 7 is provided on the upper end surface of the gear A33 corresponding to the limit block 6. The controller 8 controls the driving motor to rotate, driving the gear A33 to rotate, so that the limit block 6 at the bottom end of the sliding rod 41 is snapped into the snap-in groove 7 on the top surface of the gear A33.

[0026] As an embodiment of the present invention, the method comprises the following steps: S1: First, the preliminarily purified ultrapure nitrogen is introduced into the heat-insulating tank 1, and then the high-pressure gasified liquid nitrogen is introduced into the supercooling pipeline 2 to cool the ultrapure nitrogen and solidify and precipitate the residual impurities; S2: The ultrapure nitrogen in the heat-insulating tank body 1 is stirred in all directions through the cooperation of the first rotating disk 31, the gear A 33, the gear B 34, the stirring rod 36 and the limit adjustment assembly; S3: Start the electric push rod 323 to push the sliding rod 41 to contact the elastic reset component, so that the tooth surface of the gear A33 is separated from the tooth surface of the gear B34, and the limit block 6 is clamped into the clamping groove 7; S4: Start the driving motor to drive the sliding rod 41 to rotate, cooperate with the cleaning block 44 to slide along the surface of the supercooling pipeline 2, and use the flexible brush to clean the surface of the supercooling pipeline 2.

[0027] Working principle: first, the ultra-pure nitrogen preliminarily purified by the high- and low-pressure towers is introduced into the heat preservation tank body 1 through the material inlet, and then the liquid nitrogen gas treated by high pressure is introduced into the supercooling pipeline 2, and then the driving motor is started by the controller 8 to drive the gear A33 to rotate and drive the gear B34 to rotate, thereby driving the first rotating disk 31 to rotate, so that the bottom of the stirring rod 36 slides inside the sliding groove body 35, and the stirring rod 36 moves back and forth around under the action of the penetrating adjustment groove 372 on the second rotating disk 371. At this time, the gear C374 in the middle section of the stirring rod 36 rotates while moving back and forth under the action of the straight rack 373 on the inner wall of the penetrating adjustment groove 372, and at the same time, the bottom of the stirring rod 36 moves up and down under the action of the resistance block 5 in the sliding groove body 35, so as to stir the ultra-pure nitrogen in the heat preservation tank body 1 in all directions; After the ultra-pure nitrogen is purified by the liquid nitrogen supercooler, it is exported and stored through the material outlet. At this time, the supercooling pipeline 2 in the insulation tank body 1 will be attached with solidified impurities. When it needs to be cleaned, the electric push rod 323 is started by the controller 8 to push the sliding rod 41 to move downward to resist the gear A33, so that the gear A33 pushes the push rod 323 downward, and then the spring 322 in the compression device housing 321 is compressed until the tooth surface of the gear A33 is completely separated from the tooth surface of the gear B34. Then the controller 8 controls the driving motor to rotate, driving the gear A33 to rotate, so that the limit block 6 at the bottom end of the sliding rod 41 is inserted into the clamping groove 7 on the top surface of the gear A33. At this time, the sliding rod 41 will rotate with the rotation of the gear A33, thereby driving the cleaning block 44 to move along the supercooling pipeline. 2 moves around the periphery. Since the supercooling pipeline 2 is a serpentine curved structure, the slider 43 moves back and forth on the sliding rod 41, and the impurities attached to the supercooling pipeline 2 are cleaned by the flexible bristles. After the impurities on the supercooling pipeline 2 are cleaned, the electric push rod 323 is controlled by the controller 8 to drive the sliding rod 41 to contract, so that the spring 322 in the compressed state is released, and the gear A33 is pushed upward until the tooth surface of the gear A33 is meshed with the tooth surface of the gear B34. At the same time, cleaning liquid is introduced into the heat-insulating tank body 1, and the stirring rod 36 is driven to rotate by the driving motor, and the solidified impurities attached to the stirring rod 36 are cleaned by the cleaning liquid. After the cleaning is completed, the cleaning liquid is discharged from the inside of the heat-insulating tank body 1 through the material outlet, and the cleaning of the tank body is completed.

[0028] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. In the description of the present invention, unless otherwise specified, "multiple" means two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid nitrogen subcooler suitable for ultrapure nitrogen production, comprising a heat-insulating tank body (1), characterized in that: A subcooling pipeline (2) is installed at the center of the heat-insulating tank body (1), a material inlet and a liquid nitrogen inlet are arranged at the top of the heat-insulating tank body (1), the upper end of the subcooling pipeline (2) is connected to the liquid nitrogen inlet, a stirring adjustment mechanism is installed at the bottom of the heat-insulating tank body (1), and a cleaning mechanism is installed at the center of the subcooling pipeline (2); The stirring and adjusting mechanism comprises a first rotating disk (31), the first rotating disk (31) being rotatably connected to the bottom end of the heat-insulating tank body (1) via a bearing, a gear A (33) being installed at the center of the first rotating disk (31) via an elastic reset assembly, a gear B (34) being meshedly connected to a tooth surface on one side of the gear A (33), the gear B (34) being arranged on the periphery of the bottom end of the supercooling pipeline (2) via a bearing sleeve, a tooth surface on one end of the gear B (34) being meshed with an annular rack inside the first rotating disk (31), a sliding groove (35) being provided around the upper end surface of the first rotating disk (31), a stirring rod (36) being limitedly slidable in the sliding groove (35), and the stirring rod (36) being limitedly installed inside the heat-insulating tank body (1) via a limit adjustment assembly.

2. A liquid nitrogen subcooler suitable for ultrapure nitrogen production according to claim 1, characterized in that: The elastic reset assembly comprises a device housing (321), the device housing (321) being mounted at the bottom end of the heat-insulating tank body (1) via a driving motor, a push rod (323) being mounted in the device housing (321) via a spring (322) to limit the position, and the upper end of the push rod (323) being fixedly connected to the bottom of the gear A (33).

3. A liquid nitrogen subcooler suitable for ultrapure nitrogen production according to claim 2, characterized in that: The limit adjustment assembly comprises a second rotating disk (371), the second rotating disk (371) being fixedly mounted on the middle section of the heat-insulating tank body (1), a through adjustment groove (372) being provided on the surface of the second rotating disk (371) corresponding to the sliding groove body (35), a spur rack (373) being provided on a side wall of the through adjustment groove (372), the middle section of the stirring rod (36) passing through the through adjustment groove (372) and being mounted with a gear C (374), the tooth surface of the gear C (374) being meshed with the spur rack (373).

4. A liquid nitrogen subcooler suitable for ultrapure nitrogen production according to claim 3, characterized in that: The cleaning mechanism comprises a sliding rod (41), the sliding rod (41) being installed in the middle of the supercooling pipeline (2) via an electric push rod bearing on the top of the heat-insulating tank body (1), limiting grooves (42) being provided on both sides of the outer periphery of the sliding rod (41), a sliding block (43) being sleeved on the outer periphery of the sliding rod (41), the sliding block (43) slidingly limited on the surface of the sliding rod (41) via an internal protrusion cooperating with the limiting groove (42), a cleaning block (44) being fixedly connected to one side of the middle section of the sliding block (43), one side of the cleaning block (44) being sleeved on the outer periphery of the supercooling pipeline (2), a contact surface of the cleaning block (44) with the outer periphery of the supercooling pipeline (2) being provided with flexible bristles, and the supercooling pipeline (2) being arranged in a spiral structure.

5. A liquid nitrogen subcooler suitable for ultrapure nitrogen production according to claim 4, characterized in that: The sliding groove body (35) is formed into an arc-shaped structure. The sliding groove body (35) rotates along with the first rotating disk (31) to drive the middle part of the stirring rod (36) to move back and forth in the penetrating adjustment groove (372).

6. A liquid nitrogen subcooler suitable for ultrapure nitrogen production according to claim 5, characterized in that: A resistance block (5) is provided at the bottom of the sliding groove body (35) along the arc structure direction. The resistance block (5) is arranged as an inclined structure with the inclined surface facing upwards. The stirring rod (36) moves up and down in contact with the inclined surface of the resistance block (5) as the first rotating disk (31) rotates.

7. A liquid nitrogen subcooler suitable for ultrapure nitrogen production according to claim 6, characterized in that: A limit block (6) is provided on one side of the outer periphery of the bottom end of the sliding rod (41), and a clamping groove (7) is provided on the upper end surface of the gear A (33) corresponding to the limit block (6).

8. A liquid nitrogen subcooler suitable for ultrapure nitrogen production according to claim 7, characterized in that: The bottom of the heat-insulating tank body (1) is provided with a liquid nitrogen outlet and a material outlet, respectively; the liquid nitrogen outlet is connected to the lower end of the supercooling pipeline (2); and a controller (8) is provided on one side of the outer periphery of the heat-insulating tank body (1).

9. A method for using a liquid nitrogen subcooler suitable for ultrapure nitrogen production, suitable for the liquid nitrogen subcooler for ultrapure nitrogen production according to claim 8, characterized in that: The method comprises the following steps: S1: First, the preliminarily purified ultrapure nitrogen is introduced into the heat-insulating tank (1), and then the high-pressure gasified liquid nitrogen is introduced into the supercooling pipeline (2) to cool the ultrapure nitrogen and solidify and precipitate the residual impurities; S2: The ultrapure nitrogen in the heat-insulating tank (1) is stirred in all directions by cooperating with the first rotating disk (31), the gear A (33), the gear B (34), the stirring rod (36) and the limit adjustment assembly; S3: starting the electric push rod to push the sliding rod (41) against the elastic reset component, so that the tooth surface of the gear A (33) is separated from the tooth surface of the gear B (34), and the limit block (6) is locked into the locking groove (7); S4: starting the driving motor to drive the sliding rod (41) to rotate, cooperating with the cleaning block (44) to slide along the surface of the supercooling pipeline (2), and using a flexible brush to clean the surface of the supercooling pipeline (2).

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