Two-piston-rod or multiple-piston-rod type nitrogen spring

Abstract

The invention discloses a two-piston-rod or multiple-piston-rod type nitrogen spring. The nitrogen spring comprises a technological threaded hole which is designed in the internal upper portion of a piston rod I; the piston rod I is installed at the upper portion of a piston rod II and is hermetically connected with the piston rod II; the piston rod II is installed at the upper portion of a housing and is hermetically connected with the housing; the piston rod I, the piston rod II and the housing are each internally provided with a high-pressure nitrogen chamber; the housing is hermetically connected with a housing pedestal; the housing pedestal is fixed to the bottom of the housing through a steel wire snap spring; and an inflation valve is arranged inside the housing pedestal and is installed inside the housing pedestal in a manner of being connected with an internal thread of the housing pedestal. According to the nitrogen spring disclosed by the invention, a main functional movingcomponent consists of two or more segments of piston rods instead of the present one segment of piston rod, so the use stroke of the nitrogen spring is greatly increased under the same housing height.

Description

technical field [0001] The invention relates to the technical field of piston rod type nitrogen gas springs, in particular to a two-section or multi-section piston rod type nitrogen gas spring. Background technique [0002] It is known that the nitrogen gas spring is a component with elastic function. It seals the high-pressure nitrogen gas in a certain container. The external force compresses the nitrogen gas through the column rod. When the external force is removed, the high-pressure nitrogen gas expands to obtain a certain spring force. This part is called a nitrogen cylinder or a gas spring, or a nitrogen cylinder elastic device, referred to as a nitrogen spring. At present, the existing nitrogen gas spring mainly realizes the function by the elastic force produced by a piston rod under the pressure of nitrogen in the sealed container. The disadvantage is that the movement stroke of the piston rod cannot exceed the height of the nitrogen spring cylinder, and the nitroge...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a two-section or multi-section piston rod type nitrogen gas spring to solve the problem that a larger service stroke cannot be obtained under the condition that the total height of the nitrogen gas spring proposed in the above-mentioned background technology is limited

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