Nitrogen cylinder structure

Abstract

The utility model discloses a nitrogen cylinder structure relates to gas storage and conveying equipment technical field, including the cylinder, install control valve subassembly of cylinder top and the piston subassembly of embedding in the cylinder inside, the outer wall of cylinder is equipped with annular groove, and annular groove inlay has the elastic packing ring, and the outside of elastic packing ring is attached with the inner wall of external fixed support, control valve subassembly includes one main valve body and two vice valve body, and the main valve body is fixed in cylinder top through the screw thread connection, and two vice valve bodies are arranged on the both sides of main valve body symmetry and are communicated with main valve body through the pipeline, the piston subassembly includes piston board and with the fixed guide rod of its bottom end, the utility model provides a nitrogen cylinder structure, through the combination design of main valve body and vice valve body, the conical sealing block in main valve body and the spherical sealing element in vice valve body jointly act, has realized the multistage regulation function of gas flow, has satisfied the use demand under different scenes.

Description

Technical Field

[0001] This utility model relates to the field of gas storage and transportation equipment technology, specifically to a nitrogen cylinder structure. Background Technology

[0002] With the increasing demand for gas storage and transportation equipment in the industrial sector, nitrogen cylinders, as a key component, play an important role in many industries. However, existing nitrogen cylinder structures exhibit some limitations in practical applications and cannot fully meet the needs of modern industry for efficient, safe, and intelligent gas management systems.

[0003] A search revealed a patent application (CN115505732B) entitled "A Rotary Cylinder-Type Multi-Field Synergistic Reduction Iron High-Efficiency Cooling Device." This solution involves a nitrogen circulation cooling mechanism, including an inlet pipe, an outlet pipe, and a circulation pipe. It enhances internal thermal conductivity through nitrogen flow, achieving efficient cooling of metal pellets and, to a certain extent, realizing nitrogen recycling. However, this technology is primarily applied to high-temperature metallurgical cooling systems, focusing on nitrogen application in the process flow without optimizing the nitrogen cylinder's structure. Therefore, it lacks specific considerations regarding gas sealing, pressure regulation, and safety, limiting its applicability to specific scenarios and failing to meet general nitrogen storage and release needs.

[0004] Furthermore, a technical solution with patent number CN113834234B, entitled "A Cryogenic Device Based on Nitrogen-Fixed Cooling Medium," has been disclosed. This solution combines a liquid nitrogen chamber with a nitrogen protection chamber, using controlled cold conduction to solidify liquid nitrogen and achieve cryogenic environment regulation. Although this technology demonstrates innovation in cryogenic engineering and involves nitrogen-related structures, its core focus is on the nitrogen-fixing cooling mechanism, rather than structural improvements to the nitrogen cylinder itself. Therefore, this solution fails to adequately address issues related to gas release stability, ease of operation, and structural compactness of the nitrogen cylinder, particularly limiting its performance in portable or high-precision applications.

[0005] In summary, current technologies related to nitrogen cylinders primarily focus on nitrogen applications in specific processes, while neglecting optimization of the cylinder's structural design. Existing products exhibit limitations in the following aspects: firstly, the intelligent regulation of gas flow and pressure needs further improvement; secondly, there is room for improvement in structural design, potentially leading to inconvenience during use; and thirdly, there is still room for improvement in sealing and safety. Therefore, proposing a novel nitrogen cylinder structure to specifically address these issues is of significant importance. Utility Model Content

[0006] This utility model provides a nitrogen cylinder structure that solves the problems of insufficient gas flow and pressure regulation, inconvenient structural design, and the need to improve sealing and safety in the prior art. The specific solution is as follows:

[0007] A nitrogen cylinder structure includes a cylinder body, a control valve assembly mounted on the top of the cylinder body, and a piston assembly embedded inside the cylinder body. The outer wall of the cylinder body has an annular groove, within which an elastic sealing ring is embedded. The outer side of the elastic sealing ring is in contact with the inner wall of an external fixed bracket. The control valve assembly includes a main valve body and two auxiliary valve bodies. The main valve body is fixed to the top of the cylinder body via a threaded connection, and the two auxiliary valve bodies are symmetrically arranged on both sides of the main valve body and communicate with it via conduits. The piston assembly includes a piston plate and a guide rod fixed to its bottom end. A buffer spring is sleeved on the outer wall of the guide rod, with both ends of the buffer spring contacting the bottom surface of the piston plate and the inner wall of the bottom of the cylinder body, respectively. When the piston plate moves up and down within the cylinder body, its edge forms a dynamic seal with the inner wall of the cylinder body to adjust the gas storage space within the cylinder body.

[0008] In a preferred embodiment of the nitrogen cylinder structure described in this utility model, a rotating handle is provided at the top of the main valve body, and a conical sealing block is fixed to the bottom end of the rotating handle by bolts. The outer wall of the conical sealing block cooperates with the inner cavity of the main valve body to form a seal. The inner cavity of the main valve body has multiple radially distributed guide holes, one end of which communicates with the inside of the cylinder, and the other end connects to the conduit interface of the secondary valve body. The rotation of the rotating handle drives the conical sealing block to move up and down, thereby changing the opening of the guide holes to adjust the gas flow rate.

[0009] In a preferred embodiment of the nitrogen cylinder structure described in this utility model, a slidable adjusting column is installed inside the secondary valve body. An adjusting knob is fixed to the top of the adjusting column via a threaded connection, and a spherical seal is embedded at the bottom of the adjusting column. The outer wall of the spherical seal forms a seal with the inner cavity of the secondary valve body. The rotation of the adjusting knob causes the adjusting column to move up and down, thereby changing the gap between the spherical seal and the inner cavity of the secondary valve body, so as to further refine the output accuracy of the gas flow.

[0010] In a preferred embodiment of the nitrogen cylinder structure described in this utility model, a pressure relief valve is provided at the bottom of the cylinder, and a spring-loaded push rod is installed inside the pressure relief valve. The top end of the push rod is connected to a conical sealing gasket, and the outer wall of the conical sealing gasket cooperates with the inner cavity of the pressure relief valve to form a seal. When the pressure inside the cylinder exceeds a set value, the push rod moves upward under the pressure, and the conical sealing gasket disengages from the sealing position, thereby realizing automatic pressure relief of the gas inside the cylinder.

[0011] As a preferred embodiment of the nitrogen cylinder structure of this utility model, the outer wall of the cylinder has multiple heat dissipation grooves along its axial direction, and heat-conducting plates are embedded inside the heat dissipation grooves. The outer ends of the heat-conducting plates are in contact with the external environment. The heat-conducting plates are made of a metal material with a high thermal conductivity, which is used to quickly conduct the heat inside the cylinder to the external environment, thereby reducing the temperature inside the cylinder and preventing abnormal rise in gas pressure due to high temperature.

[0012] In a preferred embodiment of the nitrogen cylinder structure described in this utility model, a flexible sealing strip is embedded around the edge of the piston plate, and the outer wall of the flexible sealing strip is tightly fitted with the inner wall of the cylinder. The flexible sealing strip is made of high-pressure resistant and corrosion-resistant rubber material, which is used to maintain a dynamic seal with the inner wall of the cylinder during the up-and-down movement of the piston plate to prevent gas leakage.

[0013] In a preferred embodiment of the nitrogen cylinder structure described in this utility model, the bottom end of the guide rod is fixed with a limiting block by a threaded connection, the diameter of the limiting block being larger than the diameter of the guide rod; a gap is left between the bottom surface of the limiting block and the inner wall of the bottom of the cylinder, the size of which is determined by the compression of the buffer spring; when the cylinder is subjected to external impact, the buffer spring absorbs the impact energy through compression, thereby protecting the piston assembly from damage.

[0014] In a preferred embodiment of the nitrogen cylinder structure described in this utility model, a pressure sensor is provided on the outer wall of the main valve body, and the probe of the pressure sensor extends into the inner cavity of the main valve body and communicates with the inside of the cylinder; the signal output terminal of the pressure sensor is connected to an external display device through a wire for real-time monitoring of the gas pressure inside the cylinder.

[0015] In a preferred embodiment of the nitrogen cylinder structure described in this utility model, a quick connector is provided at the top of the cylinder body, and a spring-loaded locking ring is installed inside the quick connector. The inner wall of the locking ring forms a locking fit with the outer wall of the external air supply pipe. When the external air supply pipe is inserted into the quick connector, the locking ring automatically locks the air supply pipe under the action of the spring, thereby achieving quick connection. When it is necessary to disassemble the air supply pipe, pressing the locking ring will release the locking state.

[0016] In a preferred embodiment of the nitrogen cylinder structure described in this utility model, a drain valve is provided at the bottom of the cylinder body, and a manual operating lever is installed inside the drain valve. The top of the manual operating lever is connected to a conical sealing element, and the outer wall of the conical sealing element cooperates with the inner cavity of the drain valve to form a seal. When it is necessary to drain the condensate inside the cylinder body, the manual operating lever is pulled upward, and the conical sealing element is disengaged from the sealing position, and the condensate is discharged through the drain valve.

[0017] Compared with the prior art, the present invention has at least one of the following technical effects:

[0018] 1. Through the combined design of the main valve body and the auxiliary valve body, the conical sealing block in the main valve body and the spherical sealing element in the auxiliary valve body work together to realize the multi-stage regulation function of gas flow, meeting the usage needs of different scenarios.

[0019] 2. Through the design of the pressure relief valve, when the internal pressure of the cylinder is too high, the push rod drives the conical sealing gasket to automatically open the pressure relief channel, avoiding safety hazards caused by excessive pressure and improving overall safety.

[0020] 3. Through the design of the piston assembly, the flexible sealing strip on the edge of the piston plate forms a dynamic seal with the inner wall of the cylinder. At the same time, the limiting block and buffer spring at the bottom of the guide rod work together to effectively absorb external impacts and protect the internal structure.

[0021] 4. By setting pressure sensors, the gas pressure inside the cylinder is monitored in real time, and the feedback is displayed intuitively on an external display device, so that users can keep track of the equipment's operating status in a timely manner.

[0022] 5. Through the design of heat dissipation grooves and heat conduction plates, the heat inside the cylinder is quickly transferred to the external environment, reducing the risk of gas pressure fluctuations caused by high temperature and ensuring stable operation of the equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure of the nitrogen cylinder of this utility model;

[0025] Figure 2 This is a cross-sectional view of the nitrogen cylinder structure of this utility model;

[0026] Figure 3 This is a partial enlarged view of the control valve assembly of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the pressure relief valve and the drain valve of this utility model;

[0028] Figure 5 This is a partial structural diagram of the heat dissipation groove and quick connector of this utility model.

[0029] The attached figures are labeled as follows:

[0030] 1. Cylinder body; 2. Control valve assembly; 3. Piston assembly; 4. Elastic sealing ring; 5. Main valve body; 6. Sub-valve body; 7. Piston plate; 8. Guide rod; 9. Buffer spring; 10. Rotary handle; 11. Conical sealing block; 12. Flow guide hole; 13. Adjusting column; 14. Adjusting knob; 15. Spherical seal; 16. Pressure relief valve; 17. Push rod; 18. Conical sealing gasket; 19. Heat dissipation groove; 20. Heat-conducting plate; 21. Flexible sealing strip; 22. Limiting block; 23. Pressure sensor; 24. Quick connector; 25. Drain valve. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0032] The nitrogen cylinder structure of this utility model includes a cylinder body 1, a control valve assembly 2, and a piston assembly 3. The cylinder body 1 is the core load-bearing component of the overall structure. The control valve assembly 2 is fixed to its top via a threaded connection, and a pressure relief valve 16 and a drain valve 25 are provided at its bottom. An elastic sealing ring 4 is embedded in the outer wall, and a heat dissipation groove 19 is formed. The control valve assembly 2 consists of a main valve body 5 and two symmetrically arranged auxiliary valve bodies 6. A rotating handle 10 is installed on the top of the main valve body 5, and a conical sealing block 11 is fixed by bolts. The conical sealing block 11 cooperates with the inner cavity of the main valve body 5 to form a seal. Multiple radially distributed guide holes 12 are formed in the inner cavity of the main valve body. One end of the guide hole 12 communicates with the inside of the cylinder body 1, and the other end is connected to the conduit interface of the auxiliary valve body 6. An adjusting column 13 is installed inside the auxiliary valve body 6. The top of the adjusting column 13 is fixed with an adjusting knob 14 via a threaded connection, and a spherical sealing element 15 is embedded at the bottom. The spherical sealing element 15 forms a seal with the inner cavity of the auxiliary valve body 6. The piston assembly 3 includes a piston plate 7 and a guide rod 8. A buffer spring 9 is sleeved on the outer wall of the guide rod 8. The two ends of the buffer spring 9 contact the bottom surface of the piston plate 7 and the inner wall of the bottom of the cylinder 1, respectively. A flexible sealing strip 21 is embedded on the edge of the piston plate 7 and fits tightly against the inner wall of the cylinder 1.

[0033] like Figure 1 As shown, multiple heat dissipation grooves 19 are formed along the axial direction on the outer wall of the cylinder 1. Heat-conducting fins 20 are embedded inside the heat dissipation grooves 19, with their outer ends in contact with the external environment. These fins are made of a metal material with high thermal conductivity and are used to conduct heat from inside the cylinder 1 to the external environment. The outer wall of the cylinder 1 also has an annular groove, in which an elastic sealing ring 4 is embedded. The outer side of the elastic sealing ring 4 fits against the inner wall of the external fixed bracket to achieve a stable connection and sealing performance between the cylinder 1 and the external bracket. A quick connector 24 is provided at the top of the cylinder 1. A spring-loaded locking ring is installed inside the quick connector 24. The inner wall of the locking ring forms a locking fit with the outer wall of the external air supply pipe. When the external air supply pipe is inserted, the locking ring automatically locks the air supply pipe under the action of the spring. Pressing the locking ring releases the locking state.

[0034] like Figure 2 As shown, the piston plate 7 in the piston assembly 3 moves up and down inside the cylinder 1. A flexible sealing strip 21 is embedded at its edge. The flexible sealing strip 21 is made of high-pressure and corrosion-resistant rubber material, maintaining a dynamic seal with the inner wall of the cylinder 1 during the piston plate 7's up-and-down movement to prevent gas leakage. The bottom end of the guide rod 8 is fixed to a limiting block 22 via a threaded connection. The diameter of the limiting block 22 is larger than the diameter of the guide rod 8. A gap is left between the bottom surface of the limiting block 22 and the bottom inner wall of the cylinder 1. The size of the gap is determined by the compression of the buffer spring 9. When the cylinder 1 is subjected to external impact, the buffer spring 9 absorbs the impact energy through compression, thereby protecting the piston assembly 3 from damage.

[0035] like Figure 3 As shown, in the control valve assembly 2, the rotating handle 10 of the main valve body 5 drives the conical sealing block 11 to move up and down by rotation, changing the opening of the guide hole 12, thereby regulating the gas flow rate. The adjusting column 13 inside the secondary valve body 6 moves up and down by rotating the adjusting knob 14, changing the gap between the spherical seal 15 and the inner cavity of the secondary valve body 6, further refining the output accuracy of the gas flow rate. A pressure sensor 23 is installed on the outer wall of the main valve body 5. The probe of the pressure sensor 23 extends into the inner cavity of the main valve body 5 and communicates with the inside of the cylinder 1. The signal output terminal is connected to an external display device through a wire for real-time monitoring of the gas pressure inside the cylinder 1.

[0036] like Figure 4 As shown, a spring-loaded push rod 17 is installed inside the pressure relief valve 16. The top of the push rod 17 is connected to a conical sealing gasket 18. The outer wall of the conical sealing gasket 18 and the inner cavity of the pressure relief valve 16 form a seal. When the internal pressure of the cylinder 1 exceeds the set value, the push rod 17 moves upward under pressure, and the conical sealing gasket 18 disengages from the sealing position, thus achieving automatic pressure relief of the gas inside the cylinder 1. A manual operating lever is installed inside the drain valve 25. The top of the manual operating lever is connected to a conical seal. The outer wall of the conical seal and the inner cavity of the drain valve 25 form a seal. When it is necessary to drain the condensate inside the cylinder 1, the manual operating lever is pulled upward, the conical seal disengages from the sealing position, and the condensate is discharged through the drain valve 25.

[0037] like Figure 5 As shown, the heat dissipation grooves 19 are evenly distributed along the axial direction of the outer wall of the cylinder 1, and heat-conducting fins 20 are embedded inside them. The outer ends of the heat-conducting fins 20 are in contact with the external environment, which is used to quickly conduct heat from inside the cylinder 1 to the external environment, reduce the internal temperature of the cylinder 1, and prevent abnormal rise in gas pressure due to high temperature. The quick connector 24 is located at the top of the cylinder 1. Its internal locking ring automatically locks the external air supply pipe under the action of a spring. Pressing the locking ring will release the locking state, which facilitates the quick connection and disconnection of the air supply pipe.

[0038] In actual use, nitrogen enters the cylinder 1 through quick connector 24. The piston plate 7 moves up and down along the inner wall of the cylinder 1 under gas pressure, and the flexible sealing strip 21 maintains a dynamic seal with the inner wall of the cylinder 1, adjusting the gas storage space inside the cylinder 1. The main valve body 5 in the control valve assembly 2 adjusts the position of the conical sealing block 11 by rotating the handle 10, changing the opening of the guide hole 12 to achieve initial gas flow regulation. The secondary valve body 6 adjusts the gap between the spherical seal 15 and the inner cavity of the secondary valve body 6 by adjusting the knob 14, further refining the output accuracy of the gas flow. The pressure sensor 23 monitors the gas pressure inside the cylinder 1 in real time and provides feedback to the user through an external display device, facilitating monitoring of the equipment's operating status. When the pressure inside the cylinder 1 exceeds the set value, the push rod 17 in the pressure relief valve 16 moves upward under pressure, causing the conical sealing gasket 18 to disengage from its sealing position, achieving automatic pressure relief. The heat dissipation groove 19 and the heat-conducting plate 20 conduct heat from inside the cylinder 1 to the external environment, reducing the internal temperature of the cylinder 1 and ensuring stable equipment operation. The drain valve 25 is controlled by a manual operating lever to open and close the conical seal, and is used to drain the condensate inside the cylinder 1.

[0039] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of the specific implementation principle of this utility model is provided in conjunction with a specific application scenario.

[0040] In practical industrial applications, nitrogen cylinder structures are mainly used to provide a stable gas output for precision equipment, while ensuring ease of operation and safety. The following steps explain its operating principle and implementation.

[0041] First, the external gas supply pipe is inserted into the quick connector 24. The locking ring automatically locks the gas supply pipe under the action of the spring, forming a reliable mechanical connection. External high-pressure nitrogen enters the cylinder 1 through the quick connector 24, pushing the piston plate 7 upwards along the guide rod 8. The flexible sealing strip 21 maintains a dynamic seal with the inner wall of the cylinder 1 during the piston plate 7's ascent, preventing gas leakage. Simultaneously, the pressure sensor 23 collects real-time pressure data from inside the cylinder 1 and transmits it to an external display device via its signal output terminal, allowing operators to monitor the current gas pressure status.

[0042] Secondly, when gas flow needs adjustment, the operator rotates the rotary handle 10 on the main valve body 5, causing the conical sealing block 11 to move up and down, thereby changing the opening of the guide hole 12. Since one end of the guide hole 12 is connected to the inside of the cylinder 1 and the other end is connected to the secondary valve body 6, the gas flow will be initially adjusted as the opening of the guide hole 12 changes. To further refine the flow accuracy, the operator can rotate the adjusting knob 14 on the secondary valve body 6, causing the adjusting column 13 to move up and down, thereby adjusting the gap between the spherical seal 15 and the inner cavity of the secondary valve body 6. This design, through a two-stage adjustment mechanism, achieves flow control from coarse to fine, meeting the needs of different scenarios.

[0043] When the internal pressure of cylinder 1 rises above the set value due to external environmental factors or improper operation, the push rod 17 inside the pressure relief valve 16 moves upward under pressure, causing the conical sealing gasket 18 to disengage from the sealing position, opening the pressure relief channel, and allowing excess gas to be discharged, thus preventing safety hazards caused by excessive pressure. This process is completely automated by the mechanical structure without manual intervention, thereby improving the safety of the equipment.

[0044] During prolonged use, condensation may occur inside the cylinder 1 due to temperature differences. In this case, the operator can manually pull the operating lever of the drain valve 25 to disengage the conical seal, allowing the condensate to drain out through the valve. This design effectively solves the problem of condensate buildup and avoids impacting equipment performance.

[0045] Furthermore, the design of the heat dissipation slot 19 and the heat-conducting plate 20 plays a crucial role in the operation of the equipment. When the internal temperature of the cylinder 1 rises, heat is conducted to the heat dissipation slot 19 through the heat-conducting plate 20 and further dissipated to the external environment, thereby reducing the internal temperature of the cylinder 1. This heat conduction mechanism effectively avoids abnormal fluctuations in gas pressure caused by high temperatures, ensuring stable operation of the equipment under various working conditions.

[0046] Finally, when the equipment is subjected to external impact, the buffer spring 9 absorbs the impact energy through compression, protecting the piston assembly 3 from damage. The presence of the limit block 22 restricts the maximum compression of the buffer spring 9, preventing equipment failure due to over-compression. This design significantly improves the equipment's impact resistance and extends its service life.

[0047] In summary, this invention achieves efficient, safe, and stable operation of the nitrogen cylinder structure in practical applications through the aforementioned steps and principles. The coordinated operation of all components not only meets the high requirements of modern industry for gas management systems but also significantly improves the reliability and ease of operation of the equipment.

[0048] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A nitrogen cylinder structure, comprising a cylinder body (1), a control valve assembly (2) mounted on the top of the cylinder body (1), and a piston assembly (3) embedded inside the cylinder body (1), characterized in that: The outer wall of the cylinder (1) is provided with an annular groove, and an elastic sealing ring (4) is embedded in the annular groove. The outer side of the elastic sealing ring (4) is in contact with the inner wall of the external fixed bracket. The control valve assembly (2) includes a main valve body (5) and two auxiliary valve bodies (6). The main valve body (5) is fixed to the top of the cylinder (1) by a threaded connection. The two auxiliary valve bodies (6) are symmetrically arranged on both sides of the main valve body (5) and are connected to the main valve body (5) through a conduit. The piston assembly (3) includes a piston plate (7) and a guide rod (8) fixed to its bottom end. A buffer spring (9) is sleeved on the outer wall of the guide rod (8). The two ends of the buffer spring (9) are in contact with the bottom surface of the piston plate (7) and the inner wall of the bottom of the cylinder (1), respectively.

2. The nitrogen cylinder structure according to claim 1, characterized in that, The top of the main valve body (5) is provided with a rotating handle (10), and the bottom end of the rotating handle (10) is fixed with a conical sealing block (11) by bolts. The outer wall of the conical sealing block (11) cooperates with the inner cavity of the main valve body (5) to form a seal. The inner cavity of the main valve body (5) is provided with multiple radially distributed guide holes (12). One end of the guide hole (12) is connected to the inside of the cylinder (1), and the other end is connected to the conduit interface of the auxiliary valve body (6).

3. The nitrogen cylinder structure according to claim 2, characterized in that, The sub-valve body (6) has a sliding adjustment column (13) installed inside. The top of the adjustment column (13) is fixed with an adjustment knob (14) by a threaded connection. The bottom of the adjustment column (13) is fitted with a spherical seal (15). The outer wall of the spherical seal (15) forms a seal with the inner cavity of the sub-valve body (6).

4. A nitrogen cylinder structure according to claim 1, characterized in that, A pressure relief valve (16) is provided at the bottom of the cylinder (1). A spring-loaded push rod (17) is installed inside the pressure relief valve (16). The top of the push rod (17) is connected to a conical sealing gasket (18). The outer wall of the conical sealing gasket (18) cooperates with the inner cavity of the pressure relief valve (16) to form a seal.

5. A nitrogen cylinder structure according to claim 1, characterized in that, The outer wall of the cylinder (1) has multiple heat dissipation grooves (19) along its axial direction. Heat-conducting plates (20) are embedded inside the heat dissipation grooves (19), and the outer end of the heat-conducting plates (20) is in contact with the external environment.

6. A nitrogen cylinder structure according to claim 1, characterized in that, The piston plate (7) is fitted with a flexible sealing strip (21) around its edge, and the outer wall of the flexible sealing strip (21) is in close contact with the inner wall of the cylinder (1).

7. A nitrogen cylinder structure according to claim 1, characterized in that, The bottom end of the guide rod (8) is fixed with a limiting block (22) by a threaded connection. The diameter of the limiting block (22) is larger than the diameter of the guide rod (8). There is a gap between the bottom surface of the limiting block (22) and the inner wall of the bottom of the cylinder (1).

8. A nitrogen cylinder structure according to claim 1, characterized in that, A pressure sensor (23) is provided on the outer wall of the main valve body (5). The probe of the pressure sensor (23) extends into the inner cavity of the main valve body (5) and communicates with the inside of the cylinder (1). The signal output end of the pressure sensor (23) is connected to an external display device through a wire.

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