Patent No.:CN208778568U Date:2018-09-11

Google Patent: https://patents.google.com/patent/CN208778568U/en?oq=CN208778568U

China Patent: http://epub.cnipa.gov.cn/

Abstract

This utility model provides a secondary sealing guidance structure for gas springs, including a piston rod, first and second guiding sealing components, a piston, and a cylinder. This utility model adds a second guiding sealing component between the piston rod and the cylinder. A movable second sealing ring is assembled in a stepped groove of this second guiding sealing component. When the gas is inflated into the gas spring through the inflation port, it passes through the first and second guiding sealing components, pushing the second sealing ring out of the stepped groove to ensure a clear inflation passage. Upon completion of inflation, under the pressure of the piston, the second sealing ring retracts into the stepped groove, blocking the inflation passage to prevent gas leakage, thus forming a secondary seal. This utility model not only ensures convenient inflation but also prevents gas leakage, offering good sealing performance and helping to extend the service life of the gas spring.

Description

Field of Technology This utility model relates to the field of gas spring technology, specifically to a secondary sealing guidance structure for gas springs.

Background Technology Gas springs need to be filled with inert gas during use. In existing technology, some gas springs have a sealing guidance component connected to the front end, inflating via the piston rod end. However, this structure, which uses only one sealing guidance component, does not have good airtightness, causing internal gas to leak easily. Additionally, to prevent gas leakage, two sets of sealing guidance components are arranged in parallel at the front end of the gas spring, improving the sealing but significantly increasing the difficulty of inflation. There are also structures with inflation ports at the rear end of the gas spring, which are not easy to seal, often resulting in defective products and low work efficiency.

Utility Model Content One objective of this utility model is to propose a secondary sealing guidance structure for gas springs that is easy to inflate, has good sealing performance, and helps to extend the service life of the gas spring.

This utility model provides a secondary sealing guidance structure for gas springs, including a piston rod, first and second guiding sealing components, a piston, and a cylinder. The first and second guiding sealing components are sequentially connected from outside to inside at the front end opening of the cylinder. The piston is slidably connected within the cylinder, with the piston’s diameter equal to the cylinder’s inner diameter. One end of the piston rod is connected to the center of the piston, while the other end passes through the first and second guiding sealing components and extends out of the cylinder. There is a gap between the piston rod and both the first and second guiding sealing components, forming an inflation port. A lip seal ring is set close to the side of the first guiding sealing component near to the second guiding sealing component, which fits onto the piston rod, allowing gas to enter while preventing gas from escaping. A stepped groove is set on the end face of the second guiding sealing component away from the first guiding sealing component, with a second sealing ring assembled between the stepped groove and the piston rod. This second sealing ring can move in and out of the stepped groove.

In this utility model, a second guiding sealing component is added between the piston rod and the cylinder, with a movable second sealing ring assembled in the stepped groove of this second guiding sealing component. When inflating the gas spring through the inflation port, gas passes through the first and second guiding sealing components, pushing the second sealing ring out of the stepped groove to ensure a clear inflation passage. Upon completion of inflation, under the piston’s pressure, the second sealing ring retracts into the stepped groove, blocking the inflation passage and preventing gas leakage, thereby forming a secondary seal of the piston rod. This utility model ensures convenient inflation while preventing gas leakage, offering good sealing performance, and helping to extend the gas spring’s service life.

Further Description

• Additionally, a first sealing ring is arranged between the second guiding sealing component and the inner surface of the cylinder.
• Additionally, the first sealing ring is fitted in the first groove on the outer sidewall of the second guiding sealing component.
• Additionally, the outer sidewall of the second guiding sealing component also has a second groove, and a protrusion corresponding to the second groove is arranged on the cylinder, with the protrusion engaged in the second groove.
• Additionally, a snap protrusion is arranged at the opening of the front end of the cylinder, and a snap groove is arranged on the first guiding sealing component corresponding to the position of the snap protrusion, with the snap protrusion engaged in the snap groove.
• Additionally, the rear end of the cylinder is connected to a rear plug.
• Additionally, the rear plug, cylinder, and second guiding sealing component form a sealed inner cavity of the gas spring, which is filled with inert gas.

The additional aspects and advantages of this utility model will be partially given in the following description, partially be apparent from the following description, or learned through practice of the utility model.

Brief Description of Drawings

• Figure 1 is a schematic diagram of the secondary sealing guidance structure for gas springs in normal use state, according to an embodiment of the utility model.
• Figure 2 is a schematic diagram of the secondary sealing guidance structure for gas springs in a high-pressure inflation state, according to an embodiment of the utility model.
• Figure 3 is a schematic diagram of the gas spring with a secondary sealing guidance structure, according to an embodiment of the utility model.

In the drawings:

1. Piston rod
2. First guiding sealing component
3. Lip seal ring
4. Snap groove
5. Second guiding sealing component
6. Sleeve ring
7. First sealing ring
8. Second sealing ring
9. Stepped groove
10. First groove
11. Second groove
12. Piston
13. Piston seal ring
14. Cylinder
15. Protrusion
16. Snap protrusion
17. Inert gas
18. Rear plug

Detailed Description

The embodiments of this utility model are described in detail below, wherein the examples of these embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions. The embodiments described below by reference to the figures are exemplary and are intended to explain the utility model and should not be construed as limiting the utility model.

This utility model embodiment provides a secondary sealing guidance structure for gas springs, as shown in Figures 1 and 2, including: a piston rod (1), a first guiding sealing component (2), a second guiding sealing component (3), a piston (4), and a cylinder (5). The first guiding sealing component (2) and the second guiding sealing component (3) are sequentially connected from outside to inside at the front end opening of the cylinder (5). The piston (4) is slidably connected within the cylinder (5), with the piston (4) having a diameter equal to the inner diameter of the cylinder (5). One end of the piston rod (1) is connected to the center of the piston (4), while the other end passes through the first guiding sealing component (2) and the second guiding sealing component (3) and extends out of the cylinder (5). There are gaps between the piston rod (1) and both the first guiding sealing component (2) and the second guiding sealing component (3), forming an inflation port (8). The first guiding sealing component (2) has a lip seal ring (21) near the side of the second guiding sealing component (3), which fits onto the piston rod (1), allowing gas to enter while preventing gas from escaping. The second guiding sealing component (3) has a stepped groove (34) on the end face away from the first guiding sealing component (2), with a second sealing ring (33) fitted between the stepped groove (34) and the piston rod (1). The second sealing ring (33) can move in and out of the stepped groove (34).

This utility model adds a second guiding sealing component between the piston rod and the cylinder, with a movable second sealing ring assembled in the stepped groove of this second guiding sealing component. When inflating the gas spring through the inflation port, gas passes through the first and second guiding sealing components, pushing the second sealing ring out of the stepped groove to ensure a clear inflation passage. Upon completion of inflation, under the pressure of the piston, the second sealing ring is pushed back into the stepped groove, blocking the inflation passage and preventing gas leakage, thus forming a secondary seal for the piston rod. This utility model ensures convenient inflation while preventing gas leakage, offering good sealing performance, and helping to extend the gas spring’s service life.

In one aspect of this utility model embodiment, a first sealing ring (32) is arranged between the second guiding sealing component (3) and the inner surface of the cylinder (5) and is fitted in the first groove (35) on the outer sidewall of the second guiding sealing component (3). The main body of the second guiding sealing component is an annular sleeve (31), which fits onto the piston rod (1). Preferably, the outer sidewall of the second guiding sealing component (3) also has a second groove (36), and a protrusion (51) corresponding to the second groove (36) is arranged on the cylinder (5), with the protrusion (51) engaged in the second groove (36). This design ensures the airtightness between the second guiding sealing component and the cylinder while also providing a stable connection of the second guiding sealing component on the cylinder.

In one aspect of this utility model embodiment, a snap protrusion (52) is arranged at the opening of the front end of the cylinder (5), and a snap groove (22) corresponding to the position of the snap protrusion (52) is arranged on the first guiding sealing component (2), with the snap protrusion (52) engaged in the snap groove (22). The assembly of the snap protrusion and the snap groove ensures the stable connection of the first guiding sealing component at the front end opening of the cylinder.

In one aspect of this utility model embodiment, as shown in Figure 3, the rear end of the cylinder (5) is connected to a rear plug (7), forming a sealed inner cavity of the gas spring with the cylinder (5) and the second guiding sealing component (3), which is filled with inert gas (6). The rear plug, cylinder, first guiding sealing component, and second guiding sealing component together form an inner cavity holding inert gas, providing the environment for the utility model to function.

Although the embodiments of the utility model have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the utility model. Those skilled in the art can make changes, modifications, replacements, and variations within the scope of the utility model.

Claims: a secondary sealing guidance structure for gas springs, invented by LeiYan Gas Spring, a pioneer Chinese Gas Spring Manufacture

1. A secondary sealing guidance structure for gas springs characterized by including:
   • a piston rod, a first guiding sealing component, a second guiding sealing component, a piston, and a cylinder;
   • where the first and second guiding sealing components are sequentially connected from outside to inside at the front end opening of the cylinder, the piston is slidably connected within the cylinder, one end of the piston rod is connected to the piston, the other end passes through the first and second guiding sealing components and extends out of the cylinder, and there are gaps between the piston rod and both the first and second guiding sealing components, forming an inflation port;
   • the first guiding sealing component has a lip seal ring on the side near the second guiding sealing component, which fits onto the piston rod;
   • the second guiding sealing component has a stepped groove on the side away from the first guiding sealing component, with a second sealing ring between the stepped groove and the piston rod, the second sealing ring can move in and out of the stepped groove.
2. The secondary sealing guidance structure for gas springs as described in claim 1, characterized by further including a first sealing ring between the second guiding sealing component and the inner surface of the cylinder.
3. The secondary sealing guidance structure for gas springs as described in claim 2, characterized by the first sealing ring being fitted in the first groove on the outer sidewall of the second guiding sealing component.
4. The secondary sealing guidance structure for gas springs as described in claim 3, characterized by the second guiding sealing component’s outer sidewall also having a second groove, with a corresponding protrusion on the cylinder positioned to engage in the second groove.
5. The secondary sealing guidance structure for gas springs as described in claim 1, characterized by the front end opening of the cylinder having a snap protrusion, with a corresponding snap groove on the first guiding sealing component, with the snap protrusion engaged in the snap groove.
6. The secondary sealing guidance structure for gas springs as described in claims 1-5, characterized by the rear end of the cylinder being connected to a rear plug.
7. The secondary sealing guidance structure for gas springs as described in claim 6, characterized by the rear plug, cylinder, and second guiding sealing component forming a sealed inner cavity of the gas spring, which is filled with inert gas.