Nitrogen spring with dust cover structure

Abstract

The utility model discloses a nitrogen gas spring with dust cover structure, including cylinder, piston rod, bushing bushing is located between cylinder and piston rod, and the inner ring of bushing is provided with the main sealing ring that cooperates with the outer wall of piston rod, lower guide ring is connected in the bottom of piston rod and follows piston rod synchronous movement, the cover body has the opening, can with piston rod detachable connection to all or part of the cylinder sheltering, the utility model can effectively block the adverse effect that nitrogen gas spring works uses the outside environment impurity to bring, prevents the impurity and enters spring inside, ensures spring inside and outside environment isolation, prevents the invasion of outside impurity, prolongs the service life of nitrogen gas spring, reduces nitrogen gas spring maintenance and the frequency of replacement.

Description

Technical Field

[0001] This utility model belongs to the field of nitrogen spring technology, specifically relating to a nitrogen spring with a dust cover structure. 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] In existing nitrogen springs, the output end is usually exposed during operation. This makes the output end prone to contamination with impurities, which not only hinders the normal operation of the nitrogen spring but also easily damages it, thus affecting its service life.

[0004] The applicant previously filed a patent application with application number CN202420029444.7, which disclosed a fabric dust cover for a nitrogen spring. This design solved the problem of existing nitrogen springs being easily contaminated with impurities. It uses a combination of various detachable external components such as support rings and clamps to form a shielding and fixing structure for the cylinder body. However, due to its structural limitations, the assembly and installation process is relatively complicated and inconvenient. It also requires the use of special tools, which causes trouble for production and use. Utility Model Content

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model discloses a nitrogen spring with a dust cover structure, comprising: 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: A cover that can be connected to the piston rod is installed on the outer periphery of the upper end of the cylinder to partially or completely cover the cylinder, forming a physical barrier on its outside. This can effectively block the adverse effects of external environmental impurities during the operation of the nitrogen spring, prevent impurities from entering the spring, ensure the isolation between the inside of the spring and the external environment, prevent the intrusion of external impurities, extend the service life of the nitrogen spring, and reduce the frequency of maintenance and replacement of the nitrogen spring.

[0014] In the application of this technical solution, when used with nitrogen springs, the cover is simpler in construction and lower in cost compared to existing structures. Due to the use of annular grooves and snap-fit ​​holes for connection, the cover itself is plastic to form a snap-fit ​​connection structure, reducing unnecessary accessories and making it easier to install during use. Attached Figure Description

[0015] 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 invention (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; Figure 5 This is a schematic diagram illustrating the structure of the assembled cover in a specific embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram illustrating the nitrogen spring and the cover in a specific embodiment of the present invention; Figure 7 This is a partial structural diagram of the nitrogen spring and the cover in a specific embodiment of the present invention (view 1). Figure 8This is a partial structural diagram of the nitrogen spring and the cover in a specific embodiment of the present invention (view 2). Figure 9 A partial structural diagram of the piston rod is shown to illustrate a specific embodiment of this 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, annular groove 4, cover 5, snap-fit ​​through hole 50, guide angle 51, safety pressure relief valve 6. Detailed Implementation

[0016] 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.

[0017] like Figure 1 - Figure 9 As shown, a nitrogen spring with a dust cover structure according to 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; A cover 5, which can be connected to the piston rod 2, is installed on the outer periphery of the upper end of the cylinder 1 to partially or completely cover the cylinder 1, forming a physical barrier on its outside. This can effectively block the adverse effects of external environmental impurities during the operation of the nitrogen spring, prevent impurities from entering the spring, ensure the isolation between the inside of the spring and the external environment, prevent the intrusion of external impurities, extend the service life of the nitrogen spring, and reduce the frequency of maintenance and replacement of the nitrogen spring.

[0018] In the application of this technical solution, when used with nitrogen springs, the cover 5 has a simpler construction and lower cost compared to existing structures. Due to the use of the annular groove 4 and the snap-fit ​​hole 50 connection, the cover 5 itself is plastic to form a snap-fit ​​connection structure, reducing unnecessary accessories and making it easier to install during use.

[0019] like Figure 6 , Figure 7 As shown, an annular groove 4 is provided on the top circumference of the piston rod 2; The cover 5 has an opening that can be detachably connected to the piston rod 2 and completely or partially cover the cylinder 1. The upper middle part of the cover 5 has a snap-fit ​​hole 50 that can cooperate with the annular slot 4.

[0020] The upper end of the cover 5 is inclined. The cover 5 can be made of injection molding material and has a certain elasticity. During the installation process, the cover 5 is connected to the upper part of the piston rod 2 through its own plastic deformation.

[0021] like Figure 5 As shown, the lower end of the inner wall of the cover 5 has a chamfer 51, which serves as a guide during installation of the cover 5. Specifically, the diameter of the through hole 50 on this card is not less than 40mm. Of course, this diameter can be adjusted according to the actual product.

[0022] At least two sets of convex rings 20 are provided axially on the piston rod 2, 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.

[0023] In addition, the applicant filed a patent application with application number CN202321590130.6 earlier, which disclosed a balance cylinder with multiple functions, solving the problems of the existing nitrogen spring balance cylinder having a relatively simple functional structure, unstable operation, and insufficient piston rod capacity to withstand off-center loads.

[0024] Because the technical solution failed to improve the bushing and piston rod structure, the entire nitrogen spring will vibrate during rapid rebound, which is due to the aforementioned structural defects, and thus generates noise.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Specifically, the piston rod 2 is provided with a guide ring groove for mounting the lower guide ring 23.

[0030] 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.

[0031] 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.

[0032] Additionally, a safety relief valve 6 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.

[0033] 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.

[0034] The specific implementation of the embodiments is not limited to the described situation, and there may be other alternatives.

[0035] 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 common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some 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 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 nitrogen spring with a dust cover structure, characterized in that, include: Cylinder block (1); The piston rod (2) has an annular groove (4) on its top circumferential direction; 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 cover (5) has an opening, can be detachably connected to the piston rod (2), and completely or partially covers the cylinder (1); The upper middle part of the cover (5) is provided with a snap-fit ​​hole (50) that can cooperate with the annular slot (4).

2. A nitrogen spring with a dust cover structure as described in claim 1, characterized in that: The upper part of the cover (5) is inclined.

3. A nitrogen spring with a dust cover structure as described in claim 1 or 2, characterized in that: The lower end of the inner wall of the cover (5) has a chamfer (51).

4. A nitrogen spring with a dust cover structure as described in claim 1, characterized in that: The diameter of the card connection hole is not less than 40mm.

5. A nitrogen spring with a dust cover structure as described in claim 1, 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.

6. A nitrogen spring with a dust cover structure as described in claim 1 or 5, 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. A nitrogen spring with a dust cover structure as described in claim 1 or 5, 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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