Bulkhead entry door

Do you know that an invisible door？Is actually a door that can be hidden and give people an illusion when they see it. Of course, the key point of the invisible door is to hide it. It can be opened horizontally or pushed or pulled to create a private space to achieve space separation and highlight the decorative performance. The design of the "hidden door in the basement" has become a new thing, which can provide fun for family members, and can also collect some collections or valuables, making it easier to become a refuge in emergencies. The door and wall are integrated into a whole to create a specific space atmosphere, which can also play a role in extending the space. The house looks more clean and empty.

The internal structure of the utility model is a piston rod which can move in a straight line in a closed cylinder cavity. The closed cylinder cavity is filled with a liquid 2-gas two-phase mixture composed of high-pressure gas and liquid that can dissolve some high-pressure gas. The lifting force of the gas spring is generated by the high pressure gas pushing the piston rod. The driving force is determined by the pressure of high pressure gas. The dissolved amount of pressurized gas in the liquid increases with the gas compression (this process corresponds to the gas spring working in the compression stage) and decreases with the gas expansion (this process corresponds to the gas spring working in the elongation stage), so that the density of high-pressure gas in the closed cylinder always maintains a nearly constant value, that is, the air pressure is approximately unchanged.