Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a cylinder, comprising a cylinder block (1), a first piston (2) and a second piston (3), the first piston (2) and the second piston (3) being arranged in the cylinder block (1), and the first piston (2) and the second piston (3) being arranged at an interval. The cylinder (1) further comprises a first telescopic shaft (4) and a second telescopic shaft (5), wherein the first telescopic shaft (4) penetrates through the cylinder block (1) and is connected to the first piston (2), and the second telescopic shaft (5) slidably penetrates through the first telescopic shaft (4) and is connected to the second piston (3). Further disclosed is an absorption and separation device having the cylinder. The cylinder and the absorption and separation device having the cylinder enable two or more cylinders to share one cylinder block, so as to respectively control two or more pistons and telescopic shaft, such that the control directions and strokes are relatively independent of each other, the installation space is small, and the costs are low.
A: A hydraulic cylinder, a hydraulic system, and a crane. The hydraulic cylinder comprises a cylinder body (1), a first piston (2), and a piston rod (3). The first piston (2) is disposed in the cylinder body (1), and can move in the axial direction of the cylinder body (1). One end of the piston rod (3) is connected to the first piston (2), and extends in the axial direction of the cylinder body (1). The cylinder body (1) is provided with a first cavity (5) located on one side of the first piston (2) back to the piston rod (3), the first cavity (5) can introduce and discharge a hydraulic fluid. The piston rod (3) is provided with a second cavity (6) extending in the axial direction of the cylinder body (1). The hydraulic cylinder also comprises a second piston (7) capable of moving along the second cavity (6). The second piston (7) is fixed relative to the cylinder body (1), and the second cavity (6) comprises an accommodating cavity (4) located on one side of the second piston (7), facing to the first piston (2). When the hydraulic fluid is introduced into the first cavity (5), the accommodating cavity (4) can discharge the hydraulic fluid; and when the first cavity (5) discharges the hydraulic fluid, the accommodating cavity (4) can introduce the hydraulic fluid. The technical solution in the present application alleviates the problem in the prior art of high variation of the hydraulic fluid in the hydraulic cylinder in the moving process of the piston rod (3).
B: A fluid pressure-driven press-riveting device (100), comprising: a cylinder block (101) having a distal cylinder cap (112), a proximal cylinder cap (111), and a sidewall (113) extending along an axial direction therebetween, the distal cylinder cap having an opening part (114); a first piston (102) in the cylinder block, which defines a first inner cavity (121) together with the proximal cylinder cap, and has a press-riveting rod (122) extending towards the distal end and aligned with the opening part; a second piston (103) in the cylinder block, which defines a second inner cavity (131) together with the distal cylinder cap, and has a sleeve part (132) extending towards the distal end to at least reach and seal the opening part and capable of accommodating the press-riveting rod; a fluid pump system (105) separately connected to the first inner cavity and the second inner cavity so as to supply fluid therefor or suck back fluid therefrom, so that the first piston and the second piston move along the axial direction of the cylinder block, the sleeve part moves to a pre-pressed location when the second piston moves to the distal end, and then the press-riveting rod extends out to perform press-riveting; and a transmission component disposed between the first piston and the second piston, once the sleeve part moves to the pre-pressed location, the first piston being capable of getting close to the second piston and applying a pre-pressing force thereon by means of the transmission component. The press-riveting device is suitable to be operated in a small working space.
C: Disclosed is an energy conversion system, comprising a base seat (1), a rotation shaft (2) and an energy conversion device (23). The rotation shaft is fixedly connected to the base seat, and the energy conversion device is provided on the rotation shaft. The energy conversion device comprises a first cylinder (3) and a second cylinder (4), and a first piston (5) fitted to the first cylinder and a second piston (6) fitted to the second cylinder. The first piston and the second piston share a common piston rod (7). The first cylinder and the second cylinder are fixedly connected to each other and are in communication with each other via an air pipe (8). The piston rod is provided with a position limiting device. Furthermore, a buoyancy propelling device (24) is provided on the outside of the piston rod. The piston rod is adapted to the buoyancy propelling device so as to enable the piston rod to move the first piston and the second piston. Further disclosed is an energy conversion method. The energy conversion system and the energy conversion method drive the energy conversion device to rotate by using buoyant energy, and thus convert the buoyant energy into kinetic energy for people to use.
D: A compressor having a sliding valve having the position adjusted automatically, and an air-conditioning system. The compressor comprises: a rotor pair (1) having an air suction end and an exhaust end, a closed tooth groove being provided between the intake end and the exhaust end; a sliding valve (2) capable of sliding relative to the rotor pair (1) and provided with a first through hole (21) in communication with the closed tooth groove; a first cylinder (3), wherein a first piston (31) thereof is connected to a first end of the sliding valve (2) by means of a first connecting rod (33) of the first cylinder (3); a first air pressure channel (32) is provided in the first piston (31), the first connecting rod (33), and the sliding valve (2); one end of the first air pressure channel (32) is in communication with the first through hole (21), and the other end is in communication with the interior of the first cylinder (3); and a fourth cylinder (4), wherein a second piston (41) thereof is connected to a second end of the sliding valve (2) by means of a second connecting rod (43) of the fourth cylinder (4); a second air pressure channel (42) is provided in the second piston (41), the second connecting rod (43), and the sliding valve (2); one end of the second air pressure channel (42) is in communication with the exhaust end, and the other end is in communication with the fourth cylinder (4); the first piston (31) and the second piston (41) together drive the sliding valve (2) and the rotor pair (1) to slide or be static relative to each other.
Answer: A