| CPC F04B 53/18 (2013.01) [F15B 1/26 (2013.01); F15B 13/02 (2013.01)] | 10 Claims |
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1. An automatic oil return structure comprising:
an oil storage container containing hydraulic oil inside, the hydraulic oil in the oil storage container keeping at a static pressure;
a piston assembly disposed spaced apart from the oil storage container, the piston assembly having:
an inner tube having an inner channel;
a displacement unit sleeved on the inner tube, and the displacement unit sealed on an outer wall surface of the inner tube;
a first oil reservoir formed within the displacement unit and fluidly communicating with the inner channel;
an outer tube sleeved on the displacement unit; the displacement unit sealed on an inner wall surface of the outer tube, and the displacement unit being capable of moving with respect to the inner tube and the outer tube; and
a second oil reservoir formed among the outer tube, the inner tube, and the displacement unit;
a main body assembly disposed between the oil storage container and the piston assembly, and comprising:
a first main section fluidly communicating with the oil storage container;
a second main section fluidly communicating with the first oil reservoir and the second oil reservoir;
a first one-way blocking assembly being capable of preventing the hydraulic oil from flowing from the first main section to the oil storage container;
a second one-way blocking assembly being capable of preventing the hydraulic oil from flowing from the second main section to the second oil reservoir;
a switch channel fluidly communicating with the first main section;
a switch assembly mounted in the switch channel and selectively blocking the switch channel;
a pressurization channel with an end fluidly communicating with the switch channel and another end fluidly communicating with the first oil reservoir;
an oil returning channel with an end fluidly communicating with the switch channel and another end fluidly communicating with the oil storage container;
a controlling channel fluidly communicating with the first main section;
a controlling assembly mounted in the controlling channel and selectively blocking the controlling channel;
an operating channel having a first operating section and a second operating section, an end of the first operating section fluidly communicating with the controlling channel, and another end of the first operating section fluidly communicating with the oil storage container and the second operating section;
a first operating plug movably mounted in the first operating section of the operating channel, positions where the controlling channel fluidly communicates with the first operating section and where the oil storage container fluidly communicates with the first operating section disposed at two respective sides of the first operating plug;
a second operating plug mounted in the operating channel and selectively isolating the first operating section from the second operating section;
wherein, when a pressure of the first main section is higher than a starting pressure, the pressure of the first main section drives the switch assembly to move and isolate the switch channel from the oil returning channel, and the switch channel keeps fluidly communicating with the first main section and the pressurization channel, and thus the hydraulic oil flows into the first oil reservoir via the inner channel; the starting pressure is higher than the static pressure;
when the pressure of the first main section achieves a maximum pressure, the pressure of the first main section pushes the controlling assembly, and thus the first main section fluidly communicates with the first operating section; the pressure of the first main section also drives the first operating plug to push the second operating plug to move, and thus the second operating section fluidly communicates with the first operating section and the oil storage container; when the second operating section fluidly communicates with the oil storage container, the pressure of the first main section lowers down to the static pressure; the maximum pressure is higher than the starting pressure;
when the pressure of the first main section lowers down to the static pressure, the switch assembly moves and isolates the switch channel from the first main section, and the switch channel keeps fluidly communicating with the pressurization channel and the oil returning channel, and then the hydraulic oil passes by the inner channel, the pressurization channel, and the oil returning channel from the first oil reservoir to the oil storage container; the hydraulic oil in the second oil reservoir pushes the second one-way blocking assembly and enters the second main section, and the hydraulic oil flows toward the oil storage container via the pressurization channel and the oil returning channel.
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