A high-strength safety nitrogen spring

Abstract

This invention provides a high-strength, safe nitrogen spring, comprising a piston rod, a cylinder, a damping seat, and a safety component. The damping seat has an elastic element at its bottom and a vent hole. The safety component includes a pressure-relief spool and a pressure-relief end cap. The inlet end of the pressure-relief spool is aligned with the vent hole and slidably embedded in the boss. The pressure-relief end cap is fixedly installed at the bottom of the cylinder and has a pressure-relief passage. The vent end of the pressure-relief spool is elastically slidably connected to the pressure-relief end cap. When the piston of the piston rod continuously slides against the damping seat, the inlet end of the pressure-relief spool passes through the vent hole and continuously abuts against the piston of the piston rod to reach the pressure relief threshold. At this time, the piston of the piston rod pushes the vent end of the pressure-relief spool to connect with the pressure-relief passage, allowing the internal nitrogen to escape from the inlet end of the pressure-relief spool, the vent end of the pressure-relief spool, and the pressure-relief passage, preventing the nitrogen spring from exploding. The structure is simple, reliable, and low-cost.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen spring technology, specifically a high-strength safety nitrogen spring. Background Technology

[0002] Nitrogen springs (also known as nitrogen cylinders) are a new type of elastic component that uses high-pressure nitrogen as the working medium. They have advantages such as small size, large elastic force, long stroke, smooth operation, precision manufacturing, long service life (generally up to one million cycles of extension and contraction), flat elastic force curve, and no need for pre-tightening. They are used in molds (especially automotive stamping molds) and can perform tasks that are difficult for conventional elastic components such as metal springs, rubber, and air cushions. They can effectively simplify mold design and manufacturing, facilitate mold installation and adjustment, extend mold service life, and ensure stable product quality.

[0003] In existing technologies, an overpressure protection device is typically added inside the cylinder. When the internal pressure of the nitrogen spring becomes too high, the overpressure protection device activates, allowing the excessive pressure inside the nitrogen spring to be released through the overpressure protection device, preventing the nitrogen spring from bursting under extreme conditions and affecting personal and mold safety. However, this overpressure protection device has a relatively complex structure and high cost. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, this utility model provides a high-strength safety nitrogen spring.

[0005] The present invention adopts the following technical solution: A high-strength safety nitrogen spring includes a piston rod and a cylinder body. The piston rod slides on the inner wall of the cylinder body, and a boss is formed at the bottom of the cylinder body. The high-strength safety nitrogen spring also includes: A damping seat is slidably mounted on the boss, and an elastic element is provided at the bottom of the damping seat. The damping seat is provided with a clearance hole. The safety component includes a pressure relief spool and a pressure relief end cap. The air inlet end of the pressure relief spool is aligned with the vent hole and slidably embedded in the boss. The pressure relief end cap is fixedly installed at the bottom of the cylinder body and has a pressure relief passage. The air vent end of the pressure relief spool is elastically slidably connected to the pressure relief end cap. When the piston of the piston rod continuously slides against the damping seat, so that the air inlet end of the pressure relief slide plug passes through the vent hole and continuously abuts against the piston of the piston rod to reach the pressure relief threshold, the piston of the piston rod pushes the air vent end of the pressure relief slide plug to connect with the pressure relief air passage.

[0006] In one embodiment, the safety component further includes a sliding guide sleeve embedded in the boss, and the pressure relief plug is slidably connected to the sliding guide sleeve.

[0007] In one embodiment, the pressure relief spool has an internal air passage, and the air inlet of the pressure relief spool is connected to the air outlet of the pressure relief spool through the air passage.

[0008] In one embodiment, the air inlet end of the pressure relief sluice is provided with an air guide slot, the air guide slot is distributed along the circumference of the pressure relief sluice, and the air guide slot is connected to the air guide passage.

[0009] In one embodiment, the safety component further includes a spring; The pressure relief end cap is also provided with a pressure relief slot that communicates with the pressure relief air passage. The venting end of the pressure relief sliding plug is slidably disposed in the pressure relief slot. The spring is disposed at the bottom of the pressure relief slot and elastically abuts against the venting end of the pressure relief sliding plug.

[0010] In one embodiment, the spring element provides a greater elastic force to the venting end of the pressure relief spool than the nitrogen pressure inside the cylinder.

[0011] In one embodiment, the venting end of the pressure relief spool is a mounting structure, and an anti-rotation protrusion is formed on the pressure relief spool adjacent to the mounting structure.

[0012] In one embodiment, the pressure relief air passage includes a first air passage, a second air passage, and a third air passage connected in sequence. The first air passage extends along the axial inner wall of the pressure relief slot, and the second air passage is perpendicularly connected to the third air passage.

[0013] In one embodiment, the elastic element is a metal spring.

[0014] The beneficial effects of this utility model are as follows: 1. When the piston rod continuously slides against the damping seat, due to the relative motion, the air inlet of the pressure relief sluice will pass through the vent hole. Then, the air inlet of the pressure relief sluice will abut against the piston of the piston rod. If the piston rod continues to abut to reach the pressure relief threshold, the piston rod pushes the vent end of the pressure relief sluice to slide down until it connects with the pressure relief passage. This allows the internal nitrogen gas to be released from the air inlet of the pressure relief sluice, the vent end of the pressure relief sluice, and the pressure relief passage, thus preventing the nitrogen spring from bursting. The structure is simple, reliable, and low in cost.

[0015] 2. By providing an elastic element at the bottom of the damping seat, when the piston rod is subjected to external force or energy, the compressed energy is first absorbed by the internal nitrogen gas. As the piston rod continues to slide against the damping seat, the damping seat provides greater load-bearing capacity for the nitrogen gas spring, thus enabling the nitrogen gas spring to meet the requirements of high-strength application scenarios. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural cross-sectional view of a high-strength safety nitrogen spring according to one embodiment; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 Schematic diagram of the middle section; Figure 4 for Figure 1 Schematic diagram of the middle section; Explanation of reference numerals in the attached drawings: Piston rod 1; Cylinder body 2; Boss 21; Damping seat 3; Elastic element 31; Clear hole 32; Safety component 4; Pressure relief spool 41; Air guide passage 411; Air guide groove 412; Anti-rotation protrusion 413; Pressure relief end cap 42; Pressure relief passage 421; First air passage 4211; Second air passage 4212; Third air passage 4213; Pressure relief groove 422; Sliding guide sleeve 43; Spring element 44. Detailed Implementation

[0018] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0019] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0020] Please refer to the instruction manual appendix as well. Figure 1-4As shown, a high-strength safety nitrogen spring of this utility model includes a piston rod 1 and a cylinder 2. The piston of the piston rod 1 is slidably disposed on the inner wall of the cylinder 2. A boss 21 is formed at the bottom of the cylinder 2. The high-strength safety nitrogen spring also includes a damping seat 3 and a safety component 4. The damping seat 3 is slidably mounted on the boss 21. The bottom of the damping seat 3 is provided with an elastic element 31, and the damping seat 3 has a relief hole 32. The safety component 4 includes a pressure relief swivel 41 and a pressure relief end cap 42. The air inlet end of the pressure relief swivel 41 is aligned with the relief hole 32 and is slidably embedded in the boss 21. The pressure relief end cap 42 is fixedly installed on the bottom of the cylinder body 2. The pressure relief end cap 42 has a pressure relief air passage 421. The air venting end of the pressure relief swivel 41 is elastically slidably connected to the pressure relief end cap 42. When the piston of the piston rod 1 continuously slides against the damping seat 3, so that the air inlet end of the pressure relief swivel 41 passes through the relief hole 32 and continuously abuts against the piston of the piston rod 1 to reach the pressure relief threshold, at this time the piston of the piston rod 1 pushes the air venting end of the pressure relief swivel 41 to connect with the pressure relief air passage 421.

[0021] In this embodiment, when the piston of piston rod 1 continuously slides against the damping seat 3, due to the relative movement, the air inlet end of the pressure relief slide 41 will pass through the vent hole 32. Then, the air inlet end of the pressure relief slide 41 will abut against the piston of piston rod 1. If the piston continues to abut to reach the pressure relief threshold, that is, the piston of piston rod 1 pushes the air vent end of pressure relief slide 41 down until it connects with the pressure relief passage 421, so that the internal nitrogen can be discharged from the air inlet end of pressure relief slide 41, the air vent end of pressure relief slide 41 to the pressure relief passage 421, avoiding the nitrogen spring from bursting. The structure is simple and reliable, and the cost is low.

[0022] Furthermore, by providing an elastic element 31 at the bottom of the damping seat 3, when the piston rod 1 is subjected to external force or energy, the compressed energy is first absorbed by the internal nitrogen gas. When the piston of the piston rod 1 continues to slide against the damping seat 3, the damping seat 3 provides a greater load-bearing capacity for the nitrogen gas spring, thereby supporting the nitrogen gas spring to meet the high-strength application scenarios.

[0023] like Figures 1 to 3 As shown, preferably, the safety component 4 further includes a sliding guide sleeve 43, which is embedded in the boss 21, and the pressure relief plug 41 is slidably connected to the sliding guide sleeve 43. It can be understood that in this embodiment, the boss 21 is circular, and the sliding guide sleeve 43 is embedded in the center of the boss 21. Specifically, the central axes of the sliding guide sleeve 43, the pressure relief plug 41, the damping seat 3, and the pressure relief end cap 42 all coincide with the central axis of the piston rod 1. By providing the sliding guide sleeve 43, better guidance and smooth sliding of the pressure relief plug 41 when sliding axially can be ensured.

[0024] like Figures 1 to 3As shown, preferably, the pressure relief sluice plug 41 has an internal air guide channel 411, and the air inlet of the pressure relief sluice plug 41 is connected to the air outlet of the pressure relief sluice plug 41 through the air guide channel 411. It can be understood that in this embodiment, the pressure relief threshold is the critical value at which the piston of the piston rod 1 continuously abuts against and pushes the pressure relief sluice plug 41 downwards, causing the air outlet of the pressure relief sluice plug 41 to connect with the pressure relief channel 421, thereby triggering the nitrogen spring to safely relieve pressure. In this way, the nitrogen inside the nitrogen spring can be released through the air guide channel 411 and the pressure relief channel 421, resulting in a simple, reliable, and low-cost structure.

[0025] like Figure 2 and Figure 3 As shown, preferably, the air inlet end of the pressure relief swivel 41 is provided with an air guide slot 412, which is distributed circumferentially along the pressure relief swivel 41 and communicates with the air guide passage 411. This ensures that the air guide passage 411 can communicate with the internal chamber of the cylinder block 2, allowing nitrogen gas inside the cylinder block 2 to enter the air guide passage 411.

[0026] like Figure 2 and Figure 3 As shown, preferably, the safety component 4 further includes a spring 44; the pressure relief end cap 42 also has a pressure relief slot 422 communicating with the pressure relief passage 421, the venting end of the pressure relief plunger 41 is slidably disposed in the pressure relief slot 422, and the spring 44 is disposed at the bottom of the pressure relief slot 422 and elastically abuts against the venting end of the pressure relief plunger 41. Preferably, the elastic force provided by the spring 44 to the venting end of the pressure relief plunger 41 is greater than the nitrogen pressure inside the cylinder 2.

[0027] It is understandable that when the piston of piston rod 1 does not push the pressure relief slide 41 down, the elastic force of spring member 44 acting on the venting end of pressure relief slide 41 is always greater than the nitrogen pressure inside cylinder 2, so that the venting end of pressure relief slide 41 cannot connect with the pressure relief passage 421. At this time, the nitrogen spring is in normal working condition. Conversely, only when the piston of piston rod 1 abuts against the inlet end of pressure relief slide 41 will there be a tendency to push the venting end of pressure relief slide 41 down. At this time, it indicates that the load-bearing capacity of nitrogen spring is about to reach its limit and nitrogen spring is in a critical state that requires safe pressure relief.

[0028] like Figure 2As shown, preferably, the venting end of the pressure relief spool 41 is a mounting structure, and an anti-rotation protrusion 413 is formed near the mounting structure of the pressure relief spool 41. This prevents the pressure relief spool 41 from rotating, ensuring that when the nitrogen spring needs safe pressure relief, the air guide passage 411 can promptly connect with the pressure relief passage 421 for pressure relief, preventing the nitrogen spring from bursting. Specifically, in this embodiment, the air guide passage 411 is located inside the pressure relief spool 41, that is, the air inlet end of the air guide passage 411 connects to the internal chamber of the cylinder 2 through the air guide slot 412, and the venting end outlet of the air guide passage 411 extends to the outer side of the mounting structure. Thus, when the mounting structure slides down to a predetermined position relative to the pressure relief slot 422, the venting end outlet of the air guide passage 411 connects with the pressure relief passage 421.

[0029] like Figure 2 As shown, preferably, the pressure relief air passage 421 includes a first air passage 4211, a second air passage 4212 and a third air passage 4213 connected in sequence. The first air passage 4211 extends along the axial inner wall of the pressure relief groove 422, and the second air passage 4212 and the third air passage 4213 are vertically connected. The structure is reasonable and easy to process.

[0030] like Figure 1 As shown, preferably, the elastic element 31 is a metal spring.

[0031] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A high-strength safety nitrogen spring, comprising a piston rod (1) and a cylinder (2), wherein the piston of the piston rod (1) is slidably disposed on the inner wall of the cylinder (2), and a boss (21) is formed at the bottom of the cylinder (2), characterized in that, Also includes: The damping seat (3) is slidably mounted on the boss (21). The bottom of the damping seat (3) is provided with an elastic element (31). The damping seat (3) is provided with a clearance hole (32). Safety component (4) includes a pressure relief spool (41) and a pressure relief end cap (42). The air intake end of the pressure relief spool (41) is aligned with the vent hole (32) and is slidably embedded in the boss (21). The pressure relief end cap (42) is fixedly installed at the bottom of the cylinder (2). The pressure relief end cap (42) has a pressure relief passage (421). The air vent end of the pressure relief spool (41) is elastically slidably connected to the pressure relief end cap (42). When the piston of the piston rod (1) continuously slides against the damping seat (3), so that the air inlet end of the pressure relief slide plug (41) passes through the vent hole (32) and continuously abuts against the piston of the piston rod (1) to reach the pressure relief threshold, at this time the piston of the piston rod (1) pushes the air vent end of the pressure relief slide plug (41) to connect with the pressure relief air passage (421).

2. The high-strength safety nitrogen spring according to claim 1, characterized in that, The safety component (4) also includes a sliding guide sleeve (43), which is embedded in the boss (21), and the pressure relief plug (41) is slidably connected to the sliding guide sleeve (43).

3. A high-strength safety nitrogen spring according to claim 1, characterized in that, The pressure relief sluice (41) has an air guide channel (411) inside, and the air inlet of the pressure relief sluice (41) is connected to the air vent of the pressure relief sluice (41) through the air guide channel (411).

4. A high-strength safety nitrogen spring according to claim 3, characterized in that, The air inlet of the pressure relief sluice (41) is provided with an air guide slot (412), which is distributed along the circumference of the pressure relief sluice (41) and is connected to the air guide passage (411).

5. A high-strength safety nitrogen spring according to claim 1, characterized in that, The safety component (4) also includes a spring (44); The pressure relief end cap (42) is also provided with a pressure relief slot (422) that communicates with the pressure relief air passage (421). The venting end of the pressure relief sliding plug (41) is slidably disposed in the pressure relief slot (422). The spring (44) is disposed at the bottom of the pressure relief slot (422) and elastically abuts against the venting end of the pressure relief sliding plug (41).

6. A high-strength safety nitrogen spring according to claim 5, characterized in that, The spring force provided by the spring (44) to the venting end of the pressure relief spool (41) is greater than the nitrogen pressure inside the cylinder (2).

7. A high-strength safety nitrogen spring according to claim 5, characterized in that, The venting end of the pressure relief slug (41) is a mounting structure, and an anti-rotation protrusion (413) is formed on the pressure relief slug (41) adjacent to the mounting structure.

8. A high-strength safety nitrogen spring according to claim 6, characterized in that, The pressure relief air passage (421) includes a first air passage (4211), a second air passage (4212), and a third air passage (4213) connected in sequence. The first air passage (4211) extends along the axial inner wall of the pressure relief slot (422), and the second air passage (4212) is perpendicularly connected to the third air passage (4213).

9. A high-strength safety nitrogen spring according to claim 1, characterized in that, The elastic element (31) is a metal spring.

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