Silent nitrogen gas spring

Abstract

The utility model discloses mute nitrogen spring, including cylinder, piston rod, bushing bushing is located between cylinder and piston rod, the inner ring of bushing is provided with the main sealing ring cooperation with piston rod outer wall, lower guide ring is connected in the bottom of piston rod and follows piston rod synchronous movement, at least two groups convex rings are provided with on the piston rod along the axial direction, and the installation groove of configurable secondary sealing ring is formed between two groups of adjacent convex rings, the utility model discloses improved piston rod and the bushing of adaptation to it, when the piston rod goes up, because of the cooperation of secondary sealing ring, secondary sealing cavity, will seal the pressure in the bushing, along with the piston rod upshift, the gas space compression in the bushing, and the pressure increases, and the piston rod return stroke speed slows down, reaches the purpose such as noise reduction, reduces the shaking.

Description

Technical Field

[0001] This utility model belongs to the field of nitrogen spring technology, and specifically relates to a silent nitrogen spring. Background Technology

[0002] A nitrogen spring is a component with elastic properties. It seals high-pressure nitrogen gas in a defined container. An external force compresses the nitrogen gas through a piston rod. When the external force is removed, the high-pressure nitrogen gas expands to generate a certain elastic force. It mainly consists of a cylinder, guide seat, sealing ring, O-ring, and piston rod. Nitrogen springs are widely used not only in the mold industry but also in other industrial fields such as automotive, electronics, and instrumentation.

[0003] The applicant previously filed a patent application with application number CN202321590130.6, which disclosed a balance cylinder with multiple functions, solving the problems of existing nitrogen spring balance cylinders having a relatively simple functional structure, unstable operation, and insufficient piston rod capacity to withstand off-center loads.

[0004] Further research by the applicant revealed that the technical solution failed to improve the structure of the bushing and piston rod, causing the entire nitrogen spring to vibrate during rapid rebound. This was due to the aforementioned structural defects, which in turn generated noise. Utility Model Content

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The silent nitrogen spring of this utility model includes: Cylinder block; Piston rod; A bushing is located between the cylinder body and the piston rod, and the inner ring of the bushing is provided with a main sealing ring that mates with the outer wall of the piston rod. The lower guide ring is connected to the bottom end of the piston rod and moves synchronously with the piston rod; The piston rod is provided with at least two sets of convex rings along the axial direction, and an installation groove for configuring a secondary sealing ring is formed between two adjacent sets of convex rings; The bushing has a secondary sealing cavity that mates with the secondary sealing ring.

[0006] Furthermore, the diameters of the convex rings located on both sides of the secondary sealing ring are not equal.

[0007] Furthermore, the bottom of the secondary sealing cavity is beveled.

[0008] Furthermore, a metal ring that can contact the inner wall of the cylinder is sleeved on the outer periphery of the lower guide ring, and the metal ring is non-closed.

[0009] Furthermore, the piston rod is provided with a guide ring groove for mounting the lower guide ring.

[0010] Furthermore, the outer periphery of the cylinder is provided with an arc-shaped groove and a U-shaped groove.

[0011] Furthermore, a safety pressure relief valve is provided at the bottom of the cylinder.

[0012] Furthermore, the outer ring of the bushing is fitted with at least one set of O-rings.

[0013] Compared with the prior art, this utility model has the following advantages: This invention employs an improved piston rod and a matching bushing. When the piston rod moves upward, the pressure is sealed within the bushing due to the cooperation of the secondary sealing ring and the secondary sealing cavity. As the piston rod moves upward, the gas space within the bushing is compressed, increasing the pressure and slowing down the piston rod's return speed, thus achieving noise reduction and vibration reduction. When the piston rod is pressed downward, the internal gas reaction force causes the piston rod pressure to increase slowly from small to large. This design transforms the spring's thrust from a steep increase to a spring with a buffer structure. Compared to traditional nitrogen spring bushings that only have a main sealing ring to prevent air leakage, this technical solution achieves the effects of noise reduction and impact reduction during the nitrogen spring's return stroke. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the structure of a specific embodiment of the present utility model (state one). Figure 2 This is a schematic diagram illustrating the structure of a specific embodiment of the present utility model (state two). Figure 3 This is a schematic diagram illustrating the exploded structure of a specific embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram illustrating a specific embodiment of the present utility model; The reference numerals in the accompanying drawings include: Cylinder body 1, arc ring groove 10, U-shaped ring groove 11, O-ring 12, piston rod 2, convex ring 20, mounting groove 21, secondary sealing ring 22, lower guide ring 23, metal ring 24, bushing 3, main sealing ring 30, secondary sealing cavity 31. Detailed Implementation

[0015] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] The accompanying drawings are for illustrative purposes only and represent schematic diagrams, not actual physical objects. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The same or similar reference numerals in the drawings of the embodiments of this utility model correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" appear, indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0017] like Figure 1 - Figure 4 As shown, the silent nitrogen spring of this utility model includes a cylinder body 1, a piston rod 2, a bushing 3, and a lower guide ring 23; Among them, the bushing 3 is located between the cylinder body 1 and the piston rod 2, and the inner ring of the bushing 3 is provided with a main sealing ring 30 that mates with the outer wall of the piston rod 2; The lower guide ring 23 is connected to the bottom end of the piston rod 2 and moves synchronously with the piston rod 2; At least two sets of convex rings 20 are provided on the piston rod 2 along the axial direction, and an installation groove 21 for configuring a secondary sealing ring 22 is formed between two adjacent sets of convex rings 20; The bushing 3 has a secondary sealing cavity 31 that mates with the secondary sealing ring 22.

[0018] This utility model employs an improved piston rod 2 and a matching bushing 3. When the piston rod 2 moves upward, the pressure is sealed in the bushing 3 due to the cooperation of the secondary sealing ring 22 and the secondary sealing cavity 31. As the piston rod 2 moves upward, the gas space in the bushing 3 is compressed, the pressure increases, and the return speed of the piston rod 2 slows down, achieving the purpose of noise reduction and vibration reduction. When the piston rod 2 is pressed down, the pressure of the piston rod 2 increases slowly from small to large due to the reaction force of the internal gas. This design changes the spring thrust from the previous steep increase to a spring with a buffer structure. Compared with the traditional nitrogen spring bushing 3 which only has a main sealing ring 30 to avoid air leakage, this technical solution has the effect of reducing noise and impact force during the return of the nitrogen spring.

[0019] To improve the ability of piston rod 2 to withstand eccentric loads, a lower guide ring 23 is connected to the bottom end of piston rod 2. The lower guide ring 23 moves synchronously with piston rod 2 and can always provide good guidance to the tail end of piston rod 2, thereby greatly improving its ability to resist eccentric loads.

[0020] The convex rings 20 on both sides of the secondary sealing ring 22 have unequal diameters. This design ensures the durability of the secondary sealing ring 22 within the secondary sealing cavity 31 during the piston rod 2's upward return stroke. Simultaneously, the bevel at the bottom of the secondary sealing cavity 31 ensures that the secondary sealing ring 22 experiences uniform force as it enters the bushing 3, thus providing a guiding function.

[0021] like Figure 3 As shown, a metal ring 24, which can contact the inner wall of the cylinder 1, is sleeved around the outer periphery of the lower guide ring 23. The metal ring 24 is non-enclosed. The metal ring 24 is made of low-friction, wear-resistant material, which can improve its service life and the fit with the piston rod 2. The metal ring 24 is open and non-enclosed, which facilitates assembly and allows the diameter of the metal ring 24 to change with the internal temperature of the nitrogen spring during use, so that it can always maintain good contact with the inner wall of the cylinder 1, thereby improving the stability of the piston rod 2 during operation.

[0022] Specifically, the piston rod 2 is provided with a guide ring groove for mounting the lower guide ring 23.

[0023] In addition, an arc-shaped annular groove 10 and a U-shaped annular groove 11 are provided on the outer periphery of the cylinder 1. This structural design uses the arc-shaped annular groove 10 and the U-shaped annular groove 11 to fix the entire nitrogen spring. In practice, other fixing structures for the nitrogen spring can also be considered depending on the specific situation.

[0024] Furthermore, the inner cavity of cylinder 1 is provided with a snap ring groove, through which a snap ring (not shown in the figure) is installed. The inner diameter of the snap ring is smaller than the outer diameter of bushing 3. With this structural design, the snap ring installed through the snap ring groove can be used to limit the bushing 3 because its inner diameter is smaller than the outer diameter of bushing 3. In fact, other structural shapes for limiting the bushing 3 can also be considered depending on the specific situation.

[0025] Additionally, a safety relief valve is installed at the bottom of cylinder 1. The bottom of cylinder 1 has a pressure regulating hole and a protective hole for installing the safety relief valve. Cylinder 1 is connected to a quick-adjusting connector via the pressure regulating hole. This structural design allows for rapid pressure adjustment and testing via the quick-adjusting connector. In practice, other pressure regulating and installation structures can also be considered depending on the specific circumstances.

[0026] At least one set of O-rings 12 is installed on the outer ring of the bushing 3. This embodiment features a design with two O-rings 12, which improves sealing performance through redundancy and prevents external gas, liquid, and solid contaminants from entering the cylinder 1, causing pollution and safety hazards. The main sealing ring 30 in this technical solution can seal the gap between the piston rod 2 and the bushing 3 to prevent leakage. In practice, other sealing structures can also be considered depending on the specific circumstances.

[0027] The specific implementation of the embodiments is not limited to the described situation, and there may be other alternatives.

[0028] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all general technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A silent nitrogen spring, characterized in that, include: Cylinder block (1); Piston rod (2); Bushing (3), the bushing (3) is located between cylinder (1) and piston rod (2), and the inner ring of the bushing (3) is provided with a main sealing ring (30) that cooperates with the outer wall of piston rod (2). The lower guide ring (23) is connected to the bottom end of the piston rod (2) and moves synchronously with the piston rod (2); At least two sets of convex rings (20) are provided on the piston rod (2) along the axial direction, and an installation groove (21) for configuring a secondary sealing ring (22) is formed between two adjacent sets of convex rings (20). The bushing (3) has a secondary sealing cavity (31) that mates with the secondary sealing ring (22).

2. The silent nitrogen spring as described in claim 1, characterized in that: The diameters of the convex rings (20) located on both sides of the secondary sealing ring (22) are not equal.

3. The silent nitrogen spring as described in claim 1 or 2, characterized in that: The bottom of the secondary sealing cavity (31) is beveled.

4. The silent nitrogen spring as described in claim 1 or 2, characterized in that: The lower guide ring (23) is sleeved with a metal ring (24) that can contact the inner wall of the cylinder (1), and the metal ring (24) is not closed.

5. The silent nitrogen spring as described in claim 4, characterized in that: The piston rod (2) is provided with a guide ring groove for installing the lower guide ring (23).

6. The silent nitrogen spring as described in claim 1, characterized in that: The cylinder body (1) is provided with an arc-shaped annular groove (10) and a U-shaped annular groove (11) on its outer periphery.

7. The silent nitrogen spring as described in claim 1, characterized in that: A safety relief valve is provided at the bottom of the cylinder (1).

8. The silent nitrogen spring as described in claim 1, characterized in that: The outer ring of the bushing (3) is fitted with at least one set of O-rings (12).

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