Introduction

Nitrogen gas springs play a crucial role in various applications, utilizing high-pressure nitrogen gas to provide elasticity. In this article, we will delve into the internal structure of nitrogen gas springs, aiming to enhance our understanding of their operational principles.

Components of Internal Structure

The internal structure of nitrogen gas springs consists mainly of the following components:

1. Plunger Rod or Piston Rod: This part bears force and generates spring pressure. It maintains a certain gap between it and the cylinder body for movement and lubrication. The diameter, length, and shape of the plunger rod or piston rod determine the spring force and stroke of the mold nitrogen gas spring.
2. Cylinder Body, Cylinder Cover, and Cylinder Base: These components form the gas chamber, sealing high-pressure nitrogen gas within them and creating a closed system. The material, thickness, and structure of the cylinder body, cylinder cover, and cylinder base determine the mold nitrogen gas spring’s pressure-bearing capacity and durability.
3. Static Sealing Part: This ensures no leakage between the cylinder body, cylinder cover, and cylinder base. Typically composed of O-rings or other sealing elements, the material, shape, and installation method of the static sealing part affect the sealing performance and reliability of the mold nitrogen gas spring.
4. Dynamic Sealing Part: This guarantees no leakage between the plunger rod or piston rod and the cylinder body. Usually made up of U-rings or other sealing elements, the material, shape, and installation method of the dynamic sealing part influence the sealing performance and reliability of the mold nitrogen gas spring.
5. Guiding Part: This ensures no deviation or jamming between the plunger rod or piston rod and the cylinder body. It often comprises guide bushings or other guiding components. The material, shape, and installation method of the guiding part determine the guiding performance and stability of the mold nitrogen gas spring.
6. Inflation Structure Components: These enable the inflation and venting operations of the mold nitrogen gas spring. Components like inflation and venting valves, needles, and hoses are typically involved. The design, manufacturing, and usage of these components determine the inflation and venting efficiency and safety of the mold nitrogen gas spring.
7. Lubrication System: This ensures a sufficient lubricating oil film between the plunger rod or piston rod and the cylinder body. It generally includes lubricating oil, oil grooves, and oil holes. The design, manufacturing, and usage of the lubrication system impact the lubrication performance and lifespan of the mold nitrogen gas spring.
8. Fastening Connection Part: This connects the mold nitrogen gas spring to the mold or other components. It typically includes bolts, nuts, washers, etc. The design, manufacturing, and usage of the fastening connection part determine the connection strength and stability of the mold nitrogen gas spring.
9. Safety Valve, Dust Protection Device, and Anti-Deflection Load Limiting Device: These enhance the safety and reliability of the mold nitrogen gas spring. Components like safety valves, dust covers, limiting pins, etc., are usually included. The safety valve automatically releases pressure if the internal pressure of the nitrogen gas spring becomes too high, preventing explosions. The dust protection device prevents external dust and impurities from entering the nitrogen gas spring and affecting its performance. The anti-deflection load limiting device restricts the maximum stroke of the plunger rod or piston rod, preventing damage beyond design limits.

Types and Construction of Springs

There are two primary types of nitrogen gas springs: single-type and non-single-type springs. Single-type nitrogen gas springs function as individual units with a self-contained sealed system, allowing them to work in any desired position. Non-single-type springs, on the other hand, connect multiple nitrogen gas springs using a base plate or flexible hoses, forming a nitrogen gas spring system. It’s essential to understand the differences between these types and select the appropriate one for your specific needs.

Considerations for Use

Operating nitrogen gas springs within a suitable temperature range is crucial. The recommended temperature range for mold surroundings is 0°C to 40°C (32°F to 104°F). Temperatures exceeding 70°C (158°F) pose significant risks of potential accidents, including spring failure. Even without accidents, overheating can degrade the nitrogen gas sealing ring, leading to distortion and reduced lifespan, causing leaks.

To facilitate heat dissipation and prevent contact issues, it’s advisable to maintain a gap of approximately 1mm on one side between the spring and the installation hole.

Inflation Considerations

Proper inflation is paramount to the functioning and safety of nitrogen gas springs. Here’s what to keep in mind:

• Do not inflate or vent nitrogen gas springs while under load, as it can lead to damage.
• Always use pure nitrogen gas (N2) for inflation. Never introduce flammable, explosive gases, or volatile liquids into the spring, as it can lead to hazardous situations.
• Follow the markings on the cylinder to determine the appropriate inflation pressure and gradually increase the pressure to avoid damage.
• The recommended inflation pressure range is between 2.5 MPa and 15 MPa (at 20°C).
• Inflate the spring with the piston rod fully exposed. If the rod isn’t visible, start with an inflation pressure of 0.6 MPa, then gradually increase the pressure once the rod is fully exposed.
• Avoid rapid inflation with high-pressure gas, as it can damage the spring and pose safety risks to nearby equipment and individuals.

If pressure adjustment is necessary, consult professionals to ensure safe operations and avoid hazards.

Conclusion

Understanding the internal structure of nitrogen gas springs is crucial for their effective and safe use. By following the proper guidelines for usage and inflation, you can ensure both operational efficiency and safety. For more information about nitrogen gas springs and other mold components, contact Gunri. Our expertise and commitment to quality will cater to your needs. Feel free to contact us for inquiries or orders.