Patent No.:CN208778566U Date:2018-09-11

Google Patent: https://patents.google.com/patent/CN208778566U/en?oq=CN208778566U

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

Abstract

The present utility model provides a double-cylinder temperature compensation gas spring, comprising: a piston rod, an outer cylinder, a guide sealing device, a piston, an inert gas, a rear plug, a spring, a floating piston, and an inner cylinder. During use, the inert gas is filled into the chamber under high pressure, and the pressure of the gas acts on the floating piston. The spring connected to the floating piston generates a corresponding amount of compression. Since the pressure of the inert gas varies with temperature, the compression of the floating piston changes accordingly. When the temperature rises and the pressure of the inert gas increases, the floating piston is further compressed. Conversely, when the temperature drops and the pressure of the inert gas decreases, the floating piston is further extended. This way, the overall volume of the inert gas is adjusted through the change in the position of the floating piston, mitigating the effect of temperature changes on the pressure of the inert gas in the chamber and ensuring the relatively stable force output of the gas spring.

Description
A Double-Cylinder Temperature Compensation Gas Spring

Technical Field
The present utility model relates to the technical field of gas springs, and more particularly to a double-cylinder temperature compensation gas spring.

Background Technology
The gas spring operates by the pressure differential formed by the gas pressure on both sides of the gas spring piston. Since the pressure difference is determined by the area difference on both sides of the piston, the elastic force output by the gas spring is completely determined by the pressure of the gas inside it. As gas pressure is easily affected by temperature, mitigating the effect of temperature changes on the elastic force output of gas springs has become an urgent technical problem to be solved in this field.

Utility Model Content
The purpose of this utility model is to propose a double-cylinder temperature compensation gas spring that can mitigate the effect of temperature changes on the internal pressure of the gas spring.

This utility model provides a double-cylinder temperature compensation gas spring, which includes: a piston rod, an outer cylinder, a guide sealing device, a piston, an inert gas, a rear plug, a spring, a floating piston, and an inner cylinder. The guide sealing device is connected to the front-end opening of the outer cylinder, and the rear plug is connected to the rear-end opening of the outer cylinder. The outer cylinder, guide sealing device, and rear plug form the overall chamber of the gas spring. Inside the chamber, a coaxial inner cylinder is placed between the rear plug and the guide sealing device. The inner cylinder divides the chamber into an inner cavity and an outer cavity, which are connected through vent holes on the sidewall of the inner cylinder. The piston is slidably connected in the inner cavity. One end of the piston rod is connected to the piston, while the other end extends out of the outer cylinder through the guide sealing device. The diameter of the piston is slightly smaller than the inner cylinder’s diameter, and the diameter of the piston rod is slightly smaller than the inner cylinder’s diameter. Both the piston and the piston rod are coaxial with the outer cylinder. The floating piston is slidably connected in the outer cavity and is annular, with its outer ring’s diameter slightly smaller than the inner diameter of the outer cylinder and its inner ring’s diameter slightly larger than the outer diameter of the inner cylinder. The spring is installed in the outer cavity between the floating piston and the guide sealing device. Both the inner cavity and the outer cavity part of the floating piston are filled with inert gas.

During use, the inert gas is filled into the chamber under high pressure, acting on both sides of the piston. Since the piston rod and piston are riveted together, the pressure areas on both sides of the piston are different, generating an outward extension force on the piston. The internal pressure of the chamber also acts on one side of the floating piston. The floating piston is compressed by the mechanical spring corresponding to this pressure. When the unit volume of the inert gas changes due to temperature variations, the pressure changes accordingly, causing the floating piston to displace due to the pressure difference. When the temperature rises, the increased pressure of the inert gas causes the floating piston to compress further towards the auxiliary spring direction. When the temperature decreases, the floating piston displaces towards the gas chamber under the action of the auxiliary spring. This compensates for the pressure inside the gas chamber due to the changes in the total volume of inert gas caused by temperature variations, thereby reducing the effect of temperature changes on the internal pressure of the inert gas inside the chamber and ensuring the relatively stable output force of the gas spring.

Further, the vent hole is arranged on the inner wall of the inner cylinder near the rear plug.
Further, a sealing ring is arranged between the guide sealing device and the outer cylinder.
Further, a sealing ring is arranged between the guide sealing device and the inner cylinder.
Further, a sealing ring is arranged between the piston and the inner cylinder.
Further, a sealing ring is arranged between the floating piston and the inner cylinder.
Further, a sealing ring is arranged between the floating piston and the outer cylinder.

Additional aspects and advantages of the present utility model will be partially given in the description below, partially apparent from the description below, or learned through the practice of the present utility model.

Brief Description of the Drawings
Figure 1 is a schematic structural diagram of a double-cylinder temperature compensation gas spring according to an embodiment of the present utility model.
The marks in the attached drawings are as follows:
Piston rod
Outer cylinder
Guide sealing device
Piston
Inert gas
Rear plug
Spring
Floating piston
Vent hole
Inner cylinder
Inner cavity
Outer cavity
Sealing ring

Detailed Description of Preferred Embodiments
The embodiments of the present utility model will be described in detail below. The exemplary embodiments are shown in the drawings, wherein identical or similar reference numerals indicate identical or similar elements or elements having the same or similar functions throughout the drawings. The embodiments described below with reference to the accompanying drawings are illustrative and are intended to explain the present utility model, but should not be construed as limiting the present utility model.

An embodiment of the present utility model provides a double-cylinder temperature compensation gas spring, as shown in Figure 1, which includes: the piston rod 1, the outer cylinder 2, the guide sealing device 3, the piston 4, the inert gas 5, the rear plug 6, the spring 7, the floating piston 8, and the inner cylinder 10. The guide sealing device 3 is connected to the front-end opening of the outer cylinder 2, and the rear plug 6 is connected to the rear-end opening of the outer cylinder 2. The outer cylinder 2, guide sealing device 3, and rear plug 6 form the chamber of the gas spring. Additionally, a coaxial inner cylinder 10 is designed between the rear plug 6 and the guide sealing device 3, dividing the chamber into an inner cavity 11 and an outer cavity 12. The inner cavity 11 and the outer cavity 12 are connected through a vent hole 9 arranged on the sidewall of the inner cylinder 10. The piston 4 is slidably connected in the inner cavity 11. One end of the piston rod 1 is connected to the piston 4, and the other end extends out of the outer cylinder 2 through the guide sealing device 3. The diameter of the piston 4 is equal to that of the inner cylinder 10, and the diameter of the piston rod 1 is smaller than that of the inner cylinder 10. Both the piston 4 and the piston rod 1 are coaxial with the outer cylinder 2. The floating piston 8 is slidably connected in the outer cavity 12. The floating piston 8 is annular, with its outer ring surface tightly attached to the inner surface of the outer cylinder 2, and its inner ring surface tightly attached to the outer surface of the inner cylinder 10. The spring 7 is connected in the outer cavity 12 between the floating piston 8 and the guide sealing device 3. The entire inner cavity 11 and the outer cavity 12 part of the floating piston are filled with the inert gas. Here, the outer cavity on the side opposite the spring with respect to the floating piston is meant.

During use, the inert gas is filled into the chamber of the gas spring under high pressure, acting on both sides of the piston. Due to the close connection between the piston rod and the piston, the pressure areas on both sides of the piston are different, creating an outward extension force on the piston. Meanwhile, the pressure inside the chamber also acts on the floating piston, and the spring connected to it generates a corresponding amount of compression. Since the pressure of the inert gas varies with temperature changes, the displacement amount of the floating piston due to the pressure also varies. When the temperature increases and the pressure of the inert gas rises, the floating piston will further displace towards the auxiliary spring. Conversely, when the temperature decreases and the pressure of the inert gas drops, the floating piston will further displace towards the gas chamber under the action of the auxiliary spring. This compensates for the change in the total volume of the inert gas within the gas chamber, thereby reducing the effect of temperature changes on the pressure of the inert gas within the chamber and ensuring the relatively stable force output of the gas spring.

In one aspect of the embodiment of this utility model, sealing rings 13 are arranged between the guide sealing device 3 and the outer cylinder 2, between the guide sealing device 3 and the inner cylinder 10, between the piston 4 and the inner cylinder 10, between the floating piston 8 and the inner cylinder 10, and between the floating piston 8 and the outer cylinder 2. The arrangement of sealing rings ensures the air-tightness between the contact surfaces of each component, improving the performance of the gas spring.

Although the embodiments of the present utility model have been shown and described above, it is understood that these embodiments are illustrative and not restrictive. Those skilled in the art can make variations, modifications, substitutions, and alterations within the scope of the present utility model.

Claims – Double-Cylinder Temperature Compensation Gas Spring, invented by LeiYan Gas Spring, a pioneer Chinese Gas Spring Manufacture

1. A double-cylinder temperature compensation gas spring, characterized by comprising:
   A piston rod, an outer cylinder, a guide sealing device, a piston, an inert gas, a rear plug, a spring, a floating piston, and an inner cylinder;
   The guide sealing device is connected to the front-end opening of the outer cylinder, the rear plug is fixed and sealed at the rear-end opening of the outer cylinder, and the outer cylinder, guide sealing device, and rear plug form the overall chamber of the gas spring. A coaxial inner cylinder is arranged between the rear plug and the guide sealing device, dividing the chamber into an inner cavity and an outer cavity, which are connected through a vent hole arranged on the sidewall of the inner cylinder;
   The piston is slidably connected in the inner cavity, one end of the piston rod is connected to the piston, and the other end extends out of the outer cylinder through the guide sealing device. The diameter of the piston is equal to that of the inner cylinder, the diameter of the piston rod is smaller than that of the inner cylinder, and both the piston and piston rod are coaxial with the outer cylinder;
   The floating piston is slidably connected in the outer cavity. The floating piston is annular, with its outer ring surface tightly attached to the inner surface of the outer cylinder and its inner ring surface tightly attached to the outer surface of the inner cylinder, serving a bidirectional dynamic sealing role. The spring is connected in the outer cavity between the floating piston and the guide sealing device;
   The entire inner cavity and the outer cavity part of the floating piston are filled with the inert gas.
2. The double-cylinder temperature compensation gas spring according to claim 1, characterized in that the vent hole is arranged on the inner wall of the inner cylinder near the rear plug.
3. The double-cylinder temperature compensation gas spring according to claim 1, characterized in that a sealing ring is arranged between the guide sealing device and the outer cylinder.
4. The double-cylinder temperature compensation gas spring according to claim 1, characterized in that a sealing ring is arranged between the guide sealing device and the inner cylinder.
5. The double-cylinder temperature compensation gas spring according to claim 1, characterized in that a sealing ring is arranged between the piston and the inner cylinder.
6. The double-cylinder temperature compensation gas spring according to claim 1, characterized in that a sealing ring is arranged between the floating piston and the inner cylinder.
7. The double-cylinder temperature compensation gas spring according to claim 1, characterized in that a sealing ring is arranged between the floating piston and the outer cylinder.