Patent No.:CN211778709U Date:2019-07-10

Google Patent: https://patents.google.com/patent/CN211778709U/en?oq=CN211778709U

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

Abstract

This utility model discloses a damping compression gas spring that can stop doors and windows, including a cylinder, a rear end block, a guiding assembly, and a piston rod assembly. Several sections of bypass grooves are arranged on the inner sidewall of the cylinder, set at intervals along the axial direction of the cylinder.

The piston rod assembly includes a piston assembly and a piston rod, with the piston assembly dividing the cylinder into a front chamber and a rear chamber. The piston assembly includes a piston body; a flow channel is provided on the piston body to communicate the front and rear chambers. The piston body also has a first one-way sealing element that can open or close the flow channel.

When the piston assembly moves towards the front end of the cylinder, the first one-way sealing element opens the flow channel. When the piston assembly moves towards the rear end of the cylinder, the first one-way sealing element closes the flow channel.

In the axial direction of the cylinder, the length of each bypass groove is greater than the length of the contact part between the first one-way sealing element and the inner sidewall of the cylinder. This utility model has the advantages of a simple structure, convenience in use, and high compressive strength.

Technical Field

This utility model relates to the field of gas spring technology, specifically to a damping compression gas spring that can stop doors and windows.

Background Technology

A gas spring is an industrial component that can perform functions such as support, buffering, braking, height adjustment, and angle adjustment. It mainly consists of a pressure cylinder, piston rod, piston, sealing guide sleeve, filling material, and joints. The principle is to fill the enclosed pressure cylinder with an inert gas or oil-gas mixture, making the pressure inside the chamber several or even dozens of times higher than atmospheric pressure. The movement of the piston rod is realized by the pressure difference caused by the difference in the force area on both ends of the piston rod.

Currently, the gas springs on the market are mainly free type, which can only stop at the shortest or longest positions and cannot stop by themselves during the stroke, which has significant limitations, such as being unsuitable for controlling the opening and closing of doors and windows. Some self-locking and stay-type gas springs can stop at any position within the stroke, but this is generally achieved through a release mechanism or controller, increasing the difficulty of installation and debugging.

An existing example disclosed in Chinese Patent Application Number CN201120003352.4 describes a stoppable compression gas spring with a cylinder with axial damping grooves on the inner wall, a piston rod, and a rear end block fixedly sealed at the rear of the cylinder. The guide sleeve and sealing ring set are installed on the piston rod and within the cylinder, with one end of the piston rod extending out of the cylinder and another end having a piston. The piston is equipped with a damping ring at the rear of the oil passage, aligning with the axial damping grooves of the cylinder. The cylinder’s inner wall has more than one annular surface isolating the axial damping grooves, each composed of more than two independent damping grooves. Although this utility model has a simple structure and can meet the requirements of different work strokes, its compressive performance is poor, making it difficult to stabilize in different strokes and easy to compress back to a compressed state. It requires considerable effort to extend it, making it cumbersome and labor-intensive to use.

Summary of the Utility Model

This utility model aims to address the defects and shortcomings of existing technology by providing a damping compression gas spring that can stop doors and windows, offering the advantages of a simple structure, easy use, and high compressive strength.

The technical solution adopted to solve its technical problem is as follows: A damping compression gas spring that can stop doors and windows includes a cylinder, a rear end block, a guiding assembly, and a piston rod assembly. The guiding assembly is fixedly sealed at the front end of the cylinder, and the rear end block is fixedly sealed at the rear end of the cylinder. Several sections of bypass grooves are arranged on the inner sidewall of the cylinder, set at intervals along the axial direction of the cylinder.

The piston rod assembly includes a piston assembly that slidably and sealingly fits with the inner sidewall of the cylinder as well as a piston rod. The piston assembly divides the cylinder into a front chamber and a rear chamber, comprising a piston body fixed at the rear end of the piston rod. The front end of the piston rod extends out of the cylinder and slidably and sealingly fits with the guiding assembly. The piston body has a flow channel to communicate the front chamber and the rear chamber and a first one-way sealing element that can open or close the flow channel.

When the piston assembly moves towards the front end of the cylinder, the first one-way sealing element opens the flow channel. When the piston assembly moves towards the rear end of the cylinder, the first one-way sealing element closes the flow channel. The length of each bypass groove in the axial direction of the cylinder is greater than the length of the contact part between the first one-way sealing element and the inner sidewall of the cylinder.

Further Details

The side wall of the cylinder protrudes outward to form the bypass groove, making the structure simple and easy to manufacture.

The piston assembly also includes piston pads press-fitted each at one end of the piston body, both fitted with through holes corresponding to the flow channel, and a sealing friction ring that opens and closes the holes. When the piston assembly moves towards the front end of the cylinder, the sealing friction ring opens the holes. When the piston assembly moves towards the rear end, the sealing friction ring closes the holes.

Both ends of the piston body are provided with annular steps consisting of a step surface and a cylindrical surface, through which the flow channel passes. The sealing friction ring slidably fits the front cylindrical surface, and the first one-way sealing element slidably fits the rear cylindrical surface.

The first one-way sealing element uses a Y-shaped sealing ring with lips facing the rear end of the cylinder. The sealing element fits tightly with the cylindrical surface, enhancing the relative sealing of the front and rear chambers.

The guiding assembly includes a front guide sleeve fixed at the front end of the cylinder and a second one-way sealing element.

The second one-way sealing element uses a Y-shaped sealing ring with lips facing the rear end of the cylinder.

The outer end of the rear end block is fixed with a rear connector, and the front end of the piston rod is fixed with a front connector.

An O-ring is provided at the junction of the rear end block and the cylinder to improve the sealing of the inner cavity of the cylinder.

Benefits

By providing a flow channel communicating the front and rear chambers on the piston body, and a first one-way sealing element that opens and closes the flow channel: when the piston assembly moves towards the front end of the cylinder, it slides relative to the cylinder while the first one-way sealing element slides relative to the piston body, opening the flow channel. The gas in the front chamber quickly flows to the rear chamber, allowing the piston rod to extend easily and quickly.

When the piston assembly moves towards the rear end of the cylinder, the sliding of the piston body relative to the cylinder and the first one-way sealing element relative to the piston body closes the flow channel, preventing gas from flowing from the front chamber to the rear chamber, stopping the piston rod assembly from moving relative to the cylinder and enabling it to withstand higher pressure with strong compressive performance.

Additionally, the length of the bypass groove in the axial direction of the cylinder is greater than the length of the contact part between the sealing element and the inner wall of the cylinder, allowing the piston rod assembly to stop at any position along the axial direction of the cylinder, with strong compressive performance. Overall, this utility model has the advantages of simple structure, ease of use, and high compressive strength.

Description of Drawings

Fig. 1: Schematic diagram of the overall structure of the utility model. Fig. 2: Enlarged schematic diagram of the guiding assembly in this utility model. Fig. 3: Schematic diagram of the flow channel closing in this utility model. Fig. 4: Schematic diagram of the flow channel opening in this utility model. Fig. 5: Cross-sectional schematic diagram of the cylinder in this utility model.

Legend: 1 – Cylinder; 11 – Bypass Groove; 2 – Rear End Block; 3 – Guiding Assembly; 31 – Front Guide Sleeve; 32 – Second One-Way Sealing Element; 4 – Piston Rod Assembly; 41 – Piston Assembly; 411 – Piston Body; 4111 – Flow Channel; 4112 – Annular Step; 412 – First One-Way Sealing Element; 413 – Piston Pad; 4131 – Through Hole; 414 – Sealing Friction Ring; 42 – Piston Rod; 5 – Front Chamber; 6 – Rear Chamber; 7 – Rear Connector; 8 – Front Connector; 9 – O-Ring.

Specific Embodiments

For a more intuitive and complete understanding of the technical solution of this utility model, the non-restrictive feature description in conjunction with the attached figures is as follows:

As shown in Figures 1 to 5, a damping compression gas spring that can stop doors and windows includes a cylinder 1, a rear end block 2, a guiding assembly 3, and a piston rod assembly 4. The guiding assembly 3 is fixedly sealed at the front end of the cylinder 1, and the rear end block 2 is fixedly sealed at the rear end of the cylinder 1. Several sections of bypass grooves 11 are arranged on the inner sidewall of the cylinder 1, set at intervals along the axial direction of the cylinder 1. The piston rod assembly 4 includes a piston assembly 41 that slidably and sealingly fits with the inner sidewall of the cylinder 1 as well as a piston rod 42. The piston assembly 41 divides the cylinder 1 into a front chamber 5 and a rear chamber 6. The piston assembly 41 includes a piston body 411, fixed at the rear end of the piston rod 42. The front end of the piston rod 42 extends out of the cylinder 1 and slidably and sealingly fits with the guiding assembly 3. The piston body 411 has a flow channel 4111 to communicate the front chamber 5 and the rear chamber 6, and a first one-way sealing element 412 that can open or close the flow channel 4111. When the piston assembly 41 moves towards the front end of the cylinder 1, the first one-way sealing element 412 opens the flow channel 4111. When the piston assembly 41 moves towards the rear end of the cylinder 1, the first one-way sealing element 412 closes the flow channel 4111. The length of each bypass groove 11 in the axial direction of the cylinder 1 is greater than the length of the contact part between the first one-way sealing element 412 and the inner wall of the cylinder 1.

Specifically, inert gas nitrogen is filled in both the front chamber 5 and the rear chamber 6 of the cylinder 1.

The side wall of the cylinder 1 protrudes outward to form the bypass grooves 11 through a riveting or stamping process, making it easy to manufacture.

The piston assembly 41 also includes piston pads 413 press-fitted each at one end of the piston body 411, both fitted with through holes 4131 corresponding to the flow channel 4111, and a sealing friction ring 414 that opens and closes the holes 4131. When the piston assembly 41 moves towards the front end of the cylinder 1, the sealing friction ring 414 opens the holes 4131. When the piston assembly 41 moves towards the rear end of the cylinder 1, the sealing friction ring 414 closes the holes 4131.

Preferably, during installation, the components are successively sleeved onto the rear end of the piston rod 42 in the order of: piston pad 413, piston body 411, first one-way sealing element 412, and piston pad 413, then fixed by a spinning riveting process, ensuring reliable connection and easy manufacturing and installation. The sealing friction ring 414 can be installed before or after the spinning riveting process.

Both ends of the piston body 411 are provided with annular steps 4112, which consist of a step surface and a cylindrical surface. The flow channel 4111 passes through the step surface, and the sealing friction ring 414 fits slidably with the front cylindrical surface, while the first one-way sealing element 412 fits slidably with the rear cylindrical surface. The first one-way sealing element 412 uses a Y-shaped sealing ring with lips facing the rear end of the cylinder 1. The sealing element fits tightly with the cylindrical surface, forming a cone surface to enhance the sealing of the front and rear chambers.

Specifically, the sealing friction ring 414 also uses a Y-shaped sealing ring with lips facing the rear end of the cylinder 1. The front cylindrical surface has a cone surface near the front step surface. When the sealing friction ring 414 opens the holes 4131, gas flows through the holes 4131, passing through this cone surface and the gap formed by the inner circle of the sealing friction ring 414, eventually flowing through the flow channel 4111 to the rear end of the piston body 411. The outer circle of the sealing friction ring 414 is cylindrical and fits slidably and sealingly with the cylinder 1, ensuring the relative sealing of the front chamber 5 and the rear chamber 6.

The guiding assembly 3 includes a front guide sleeve 31 fixed at the front end of the cylinder 1 and a second one-way sealing element 32, which uses a Y-shaped sealing ring with lips facing the rear end of the cylinder 1.

The outer end of the rear end block 2 is fixed with a rear connector 7, and the front end of the piston rod 42 is fixed with a front connector 8. Two O-rings 9 are provided at the junction of the rear end block 2 and the cylinder 1.

Preferably, the front guide sleeve 31 and the rear end block 2 are sealed to both ends of the cylinder 1 by a riveting process. Holes for connecting and installing the gas spring are provided on both the front connector 8 and the rear connector 7.

Working Principle

The specific working principle of this utility model is as follows: When extending the piston rod 42, during the extension process, the piston assembly 41 slides relative to the cylinder 1, and both the first one-way sealing element 412 and the sealing friction ring 414 slide relative to the annular steps 4112, with their lips facing the rear end of the cylinder 1. This opens the flow channel 4111 and the holes 4131, allowing nitrogen gas from the front chamber 5 to flow through the through holes 4131 on the front piston pad 413, the flow channel 4111, and the through holes 4131 on the rear piston pad 413 to the rear chamber 6, enabling the piston rod 42 to extend quickly and easily, as shown in Figure 4.

During use, when the piston rod 42 is under pressure, the piston assembly 41 slides relative to the cylinder 1, while the first one-way sealing element 412 and the sealing friction ring 414 slide relative to the annular steps 4112, with their lips facing the front end of the cylinder 1. This closes the flow channel 4111 and the holes 4131, preventing the nitrogen gas from flowing between the front chamber 5 and the rear chamber 6, keeping the piston rod assembly 4 fixed relative to the cylinder 1, as shown in Figure 3.

To adjust the extended length of the piston rod 42, when more extension is needed, repeat the extension steps. Note that when the first one-way sealing element 412 is in contact with the inner sidewall position between adjacent bypass grooves 11, the gas in the front chamber 5 and the rear chamber 6 does not flow between chambers.

When retraction is needed, apply more pressure to the piston rod 42 to compress the rear chamber 6, causing the piston assembly 41 to slide relative to the cylinder 1. When the contact area between the first one-way sealing element 412 and the inner sidewall of the cylinder 1 slides to the bypass grooves 11, the rear chamber 6 flows through the bypass grooves 11 to the front chamber 5. At this point, the piston rod assembly 4 can slide quickly and easily relative to the cylinder 1 until the first one-way sealing element 412 and the inner sidewall of the cylinder 1 contact the inner sidewall position between the adjacent bypass grooves 11 again, causing the piston rod assembly 4 to stop moving relative to the cylinder 1 and remain fixed again. Likewise, to stop the piston rod 42 at different stroke positions, repeat the above operation to make adjustments.

The above description is merely the preferred embodiment of this utility model. Therefore, any equivalent changes or modifications made according to the structural, characteristic, and principle described in the claims of this utility model are included in the scope of this utility model.

Claims – A damping compression gas spring that can stop doors and windows, invented by LeiYan Gas Spring, a pioneer Chinese Gas Spring Manufacture

1. A damping compression gas spring that can stop doors and windows, comprising a cylinder (1), a rear end block (2), a guiding assembly (3), and a piston rod assembly (4). The guiding assembly (3) is fixedly sealed at the front end of the cylinder (1), and the rear end block (2) is fixedly sealed at the rear end of the cylinder (1). Several sections of bypass grooves (11) are arranged on the inner sidewall of the cylinder (1), set at intervals along the axial direction of the cylinder (1). The piston rod assembly (4) includes a piston assembly (41) that slidably and sealingly fits with the inner sidewall of the cylinder (1) as well as a piston rod (42). The piston assembly (41) divides the cylinder (1) into a front chamber (5) and a rear chamber (6). The piston assembly (41) includes a piston body (411), fixed at the rear end of the piston rod (42). The front end of the piston rod (42) extends out of the cylinder (1) and slidably and sealingly fits with the guiding assembly (3). The feature is that the piston body (411) has a flow channel (4111) to communicate the front chamber (5) and the rear chamber (6), and a first one-way sealing element (412) that can open or close the flow channel (4111). When the piston assembly (41) moves towards the front end of the cylinder (1), the first one-way sealing element (412) opens the flow channel (4111). When the piston assembly (41) moves towards the rear end of the cylinder (1), the first one-way sealing element (412) closes the flow channel (4111). The length of each bypass groove (11) in the axial direction of the cylinder (1) is greater than the length of the contact part between the first one-way sealing element (412) and the inner wall of the cylinder (1).
2. The damping compression gas spring as described in claim 1, wherein the side wall of the cylinder (1) protrudes outward to form the bypass grooves (11).
3. The damping compression gas spring as described in claim 1, wherein the piston assembly (41) also includes piston pads (413) press-fitted each at one end of the piston body (411). Both piston pads (413) are fitted with through holes (4131) corresponding to the flow channel (4111), and a sealing friction ring (414) that opens and closes the holes (4131). When the piston assembly (41) moves towards the front end of the cylinder (1), the sealing friction ring (414) opens the holes (4131). When the piston assembly (41) moves towards the rear end of the cylinder (1), the sealing friction ring (414) closes the holes (4131).
4. The damping compression gas spring as described in claim 3, wherein both ends of the piston body (411) are provided with annular steps (4112) consisting of a step surface and a cylindrical surface. The flow channel (4111) passes through the step surface, and the sealing friction ring (414) fits slidably with the front cylindrical surface while the first one-way sealing element (412) fits slidably with the rear cylindrical surface.
5. The damping compression gas spring as described in claim 4, wherein the first one-way sealing element (412) uses a Y-shaped sealing ring with lips facing the rear end of the cylinder (1). The sealing element fits tightly with the cylindrical surface, forming a cone surface.
6. The damping compression gas spring as described in claim 1, wherein the guiding assembly (3) includes a front guide sleeve (31) fixed at the front end of the cylinder (1) and a second one-way sealing element (32).
7. The damping compression gas spring as described in claim 6, wherein the second one-way sealing element (32) uses a Y-shaped sealing ring with lips facing the rear end of the cylinder (1).
8. The damping compression gas spring as described in claim 1, wherein the outer end of the rear end block (2) is fixed with a rear connector (7), and the front end of the piston rod (42) is fixed with a front connector (8).
9. The damping compression gas spring as described in claim 8, wherein an O-ring (9) is provided at the junction of the rear end block (2) and the cylinder (1).