Air damper

Abstract

The utility model discloses an air shock absorber which comprises a cylinder body, an upper cover and a lower cover which are packaged at two ends of the cylinder body, and a piston rod which is inserted into the cylinder body through the upper cover, and is characterized in that the cylinder body is divided into an upper cavity and a lower cavity which are not communicated with each other by a piston which is arranged in the cylinder body through the piston rod; compressed air is injected into the upper cavity and the lower cavity through air channels so as to adjust the pressure in the cavities. Damping oil in an original shock absorber is replaced with compressed gas to generate damping, the gas pressure is changed, and therefore the purpose that damping force is adjustable is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of damper, especially a kind of air damper. BACKGROUND

[0002] The existing damper is mostly compressed / tensioned damping by oil, and the structure is simple and low in cost, but oil leakage is prone to occur after a long time.And, due to the oil filled in the damper, the maintenance process is complicated, and the oil is prone to spill during the process, polluting the environment. SUMMARY

[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of the utility model is to provide an air damper, which replaces the original hydraulic damper by using compressed gas to achieve damping.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] An air damper, comprising a cylinder, an upper cover and a lower cover encapsulated at both ends of the cylinder, and a piston rod inserted in the cylinder through the upper cover, the cylinder is divided into an upper chamber and a lower chamber which are not connected to each other by a piston placed in the cylinder through the piston rod, and the upper chamber and the lower chamber are both filled with compressed air through an air passage to adjust the pressure in the chamber.

[0006] In one preferred embodiment of the utility model, the air passage comprises a first air passage arranged in the piston rod and communicated with the upper chamber, and a second air passage arranged in the lower cover and communicated with the lower chamber.

[0007] In one preferred embodiment of the utility model, the first air passage extends coaxially with the piston rod, and a second air passage extending radially is further arranged on the piston rod, and the second air passage communicates the first air passage with the upper chamber.

[0008] In one preferred embodiment of the utility model, a mounting step for engaging with the end face of the piston is arranged on the piston rod, and a gasket is further arranged between the mounting step and the end face of the piston, and when the piston is fastened, the gasket is extruded by the mounting step and the piston to form a seal.

[0009] In one preferred embodiment of the utility model, the piston is a double-ring sealing piston.

[0010] In one preferred embodiment of the utility model, a limiting block limiting the stretching of the piston rod is further arranged on the piston rod.

[0011] In one preferred embodiment of the utility model, the limiting block is fixed on the piston rod by a fixed ring.

[0012] The air damper has the advantages that:

[0013] The air damper provided by the utility model utilizes compressed gas to replace damping oil in the original damper to generate damping, and the size of gas pressure is changed to realize the purpose of adjustable damping force. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description.

[0015] Figure 1 is the sectional view of the utility model.

[0016] Figure 2 is the Figure 1 enlarged view of the piston.

[0017] Figure 3 is the explosion view of the utility model.

[0018] Figure 4 is the overall schematic view of the utility model. DETAILED DESCRIPTION

[0019] In the description of the utility model, it needs to be explained that the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and the above description is simplified for the convenience of describing the utility model, and is not indicative or suggestive of the devices or elements indicated must have a specific orientation, a specific orientation and operation, and therefore cannot be understood as a limitation on the utility model.

[0020] The singular forms "a", "said" and "the" used in the specification are intended to include plural forms unless clearly indicated otherwise. The terms "include", "contain" and "have" used in the specification indicate the existence of the claimed features, but do not exclude the existence of one or more other features.

[0021] In the specification, when an element is referred to as being "on", "fixed" to, "connected" to, "joined" to or the like another element, the element can be directly on, fixed to, connected to, joined to or in contact with the other element, or there can be an intermediate element.

[0022] It will be understood that, although the terms "first", "second", etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a first element could be termed a second element without departing from the teachings of the present application.

[0023] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. It is to be understood, however, that the application can be presented in many different forms and should not be limited to the embodiments described below. It is also to be understood that the embodiments disclosed herein can be combined in various ways, thereby providing more additional embodiments. In all the drawings, the same reference numerals refer to the same or similar elements or components.

[0024] Figure 1 An air damper is shown, which includes a piston rod 10 inserted in a cylinder 60, and a piston 20 sleeved on the piston rod 10 to divide the cylinder 60 into an upper chamber 61 and a lower chamber 62. An upper cover 30 and a lower cover 40 are arranged at both ends of the cylinder 60 to seal the cylinder 60, and an actuator 50 is arranged inside the upper cover 30 to stabilize the piston rod 10 during stretching / compression. The piston rod 10 is inserted into the cylinder 60 through the upper cover 30 and the actuator 50.

[0025] Reference Figure 2 A first air passage 11 coaxially extending with the piston rod 10 and a third air passage 12 radially extending along the piston rod 10 are arranged in the piston rod 10, and the first air passage 11 and the third air passage 12 cross each other to connect the upper chamber 61 with an external compressed air source. A second air passage 41 is arranged in the lower cover 40 to also connect the lower chamber 62 with the external compressed air source. The upper cover 30 can be fixed on the cylinder 60 by a threaded structure for easy disassembly.

[0026] Reference Figure 3 A stepped structure 14 is arranged on the piston rod 10 to facilitate the direct clamping of one end surface of the piston 20 on the stepped structure 14, and the other end surface of the piston 20 is pressed and fixed by a piston rod nut 13 passing through the piston 20. A sealing gasket 21 is arranged between the stepped structure 14 and the piston 20 to prevent the gas in the upper chamber 61 from passing through the piston 20 into the lower chamber 62 from the assembly gap. An annular groove 13 is also formed on the outer circumferential surface of the piston rod 10, and a limit block 70 is fixed on the side of the piston rod 10 close to the piston 20 by a C-shaped fixing ring 71 fitted on the groove 13. Thus, when the piston rod 10 moves to the upper limit of the stretching stroke, the limit block 70 contacts the lower end of the actuator 50 to limit the stroke.

[0027] Reference Figure 4The upper cavity 61 and the lower cavity 62 are connected with the trachea 1 outside through the first air passage 11 and the second air passage 41, and the damping is generated by the compressed gas volume, and the damping force is adjustable by changing the size of the gas pressure.

Claims

1. An air damper comprising a cylinder, an upper cover and a lower cover which are sealed at both ends of the cylinder, and a piston rod which is inserted in the cylinder through the upper cover, characterized in that, The cylinder is divided into upper and lower chambers by a piston arranged in the cylinder, the upper and lower chambers are connected with a gas passage, and the pressure in the chambers is adjusted by injecting compressed air into the chambers through the gas passage.

2. An air damper as defined in claim 1, characterized in that The first gas passage is coaxial with the piston rod, and a third gas passage is arranged on the piston rod and extends radially.

3. An air damper according to any one of claims 1 to 2, characterized in that A mounting step is arranged on the piston rod and used to engage with the end face of the piston, and a gasket is arranged between the mounting step and the end face of the piston, so that the gasket is pressed by the mounting step and the piston to form a seal when the piston is fastened.

4. An air damper as defined in claim 3, characterized in that The piston is a double-ring sealing piston.

5. An air damper as defined in claim 3, wherein A limiting block is arranged on the piston rod to limit the stretching of the piston rod.

6. An air damper as defined in claim 5, characterized in that The limiting block is fixed on the piston rod by a fixing ring in interference.

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