Please select the most similar patent number from A, B, C and D. Which number is?
A gas cylinder assembly and a compressor having said gas cylinder assembly. The gas cylinder assembly comprises a cylinder body (1), a valve assembly (2), a cylinder cover (3), a noise muffler (8), and a press cover (5); the valve assembly (2) is arranged within the cylinder body (1), a seal ring (4) is provided between the cylinder cover (3) and the valve assembly (2), the noise muffler (8) and the cylinder cover (3) are integrally formed, the press cover (5) is connected to the cylinder body (1), and the cylinder cover (3) is located between the cylinder body (1) and the press cover (5), so as to facilitate the press cover (5) in fixing the cylinder cover (3) onto the cylinder body (1). The present gas cylinder assembly has unique advantages such as a good sealing effect, a low number of parts, low manufacturing difficulty and costs, and no deformation of the cylinder cover and the cylinder body.
A: An end cover assembly, an air cylinder, a tread sweeper and a railway vehicle. The end cover assembly (100) is used for sealing an air inlet end of an air cylinder (200) of a tread sweeper (300), and comprises a cylinder cover (110), wherein a first external thread column body (111) extending and protruding is arranged on an inner side end face (110a) of the cylinder cover (110), and is mounted matching the air cylinder (200); a second external thread column body (112) extending and protruding is arranged on an outer side end face (110b) of the cylinder cover (110); and the cylinder cover (110) is provided with a through mounting hole (113), and the mounting hole (113) extends to penetrate the first external thread column body (111) and the second external thread column body (112) and is used for arranging an air core (230) and an elastic pull rod (240); and a gland (120), wherein a threaded hole (121) matching the second external thread column body (112) is provided on an inner side end face (120a) of the gland (120); a throttle air vent hole (122) is provided between the threaded hole (121) and an outer side end face (120b) of the gland (120); a first mounting groove (123) is further provided between the inner side end face (120a) of the gland (120) and the threaded hole (121); and in an assembled state, the inner side end face of the gland (120) abuts against the outer side end face (110b) of the cylinder cover (110), and sealing is provided by means of sealing rings (130, 140 and 150) arranged inside the first mounting groove (123).
B: Disclosed are a cylinder head assembly, a compressor and a refrigeration device. The cylinder head assembly comprises a cylinder seat (1), which is provided with a cylinder hole (11) and an exhaust silencing cavity (12), wherein an annular boss (13) is arranged at the end, having the cylinder hole (11), of the cylinder seat (1), a first mounting face (14) is formed on an end face of the annular boss (13), a first exhaust throttling through hole (15) is provided in the first mounting face (14), the first exhaust throttling through hole (15) is in communication with the exhaust silencing cavity (12), and an outer circle face of the annular boss (13) is not coaxial with the cylinder hole (11) and is offset in the direction where the first exhaust throttling through hole (15) is located; cylinder head parts (4), wherein an edge of the cylinder head part (4) is provided with a protrusion (44), and the protrusion (44) is provided with a second exhaust throttling through hole (45) corresponding to the first exhaust throttling through hole (15); and a cylinder cover (5), which is provided with a first cylindrical mounting groove (51) and a second cylindrical mounting groove (52). The compressor comprises the cylinder head assembly, and the refrigeration device comprises the compressor. The cylinder head assembly, the compressor and the refrigeration device have the advantages of a columnar cylinder head being miniaturized and low cost, and also the process difficulty of exhausting air from a cylinder cover of a traditional columnar cylinder head design is avoided, and material costs are saved on.
C: A high-pressure gas compression ignition engine, comprising a cylinder body (1), a piston (2) and a cylinder cover (3), the piston (2) being mounted on the cylinder body (1) and the cylinder body being sealed by the cylinder cover (3) to form a combustion chamber (4) for fuel operation, and an intake valve (5) and an exhaust valve (6) being respectively provided on the cylinder cover (3). The engine further comprises: a fuel supply system (7), the fuel in a fuel tank (70) of the fuel supply system passing through a fuel channel, being pressurized by a pump body (71) and being then supplied into the combustion chamber (4) of the cylinder body (1); a fuel injection device (8) used for injecting the fuel to the intake valve (5); and a compression ignition system (9), which is connected to an exhaust duct or an external gas source, recovers some of exhaust energy discharged from the combustion chamber (4) during a power stroke or suctions into the external gas source, and compresses and stores same in a compression ignition gas storage tank (91), the cylinder cover (3) is provided with a compression ignition gas valve assembly (92) for compression ignition of the fuel injected in the combustion chamber (4). The high-pressure gas compression ignition engine pressurizes the discharged gas energy or the external gas source into a high-pressure gas, which is not limited by the knock resistance property of a fuel. The present invention is used for automatic compression ignition in the combustion chamber, reduces fuel consumption and pollution, and effectively increases the compression ratio and improves the dynamic property.
D: A rotary engine consists of: an elliptic cylinder body (1) and a front cylinder cover (2) and a rear cylinder cover (3) fixed to the cylinder body (1). A separating plate (4) is provided at the centre of the cylinder body (1), which divides the elliptic cylinder body (1) into two approximately semicircular cavities (5, 6), and in the radially symmetric centre line of each of the semicircular cavities there is provided a synchronically rotatable gear shaft (7, 8), respectively; the two gear shafts (7, 8) are supported on the front and rear cylinder covers (2, 3) via a bearing, elliptic gear ring pistons (9, 10) internally meshing with the gear shafts (7, 8) are mounted on the two gear shafts (7, 8), respectively; an inlet valve, an exhaust valve, a gas reserve barrel, and a combustion chamber are provided on the separating plate (4), and an oil nozzle and a sparking plug are provided in the chamber. The present engine has a compact structure, few parts, a small volume, a reduced weight, good sealing, a high working efficiency, and easy maintenance, solving problems present in prior art engines, such as unreasonable structural design, complicated structure, and low efficiency, etc. Engines, and also hydrodynamic machinery such as liquid pumps, hydraulic motors, and air compressors, etc., can be obtained by changing the inlet and exhaust structures.
Answer: B