Please select the most similar patent number from A, B, C and D. Which number is?
An electrically controlled pneumatic plug door, comprising a sealing frame (1) and a door leaf assembly (2). A sealing surface (11) is provided at one side of the sealing frame (1). The door leaf assembly (2) is provided with a door panel (21) and a sealing member (22) arranged around the door panel (21). The sealing member (22) is provided with a first sealing lip (221) and a second sealing lip (222) protruding towards the sealing surface (11), the first sealing lip (221) and the second sealing lip (222) both sealedly fit the sealing surface (11), and a sealing slot (223) is formed between the first sealing lip (221) and the second sealing lip (222). Also disclosed is a rail vehicle comprising the electrically controlled pneumatic plug door. Use of the electrically controlled pneumatic plug door can solve the problem of poor sealing effect of a related electrically controlled pneumatic plug door.
A: A seal assembly (800) for use with a scroll compressor and a scroll compressor (10) comprising the seal assembly (800), the scroll compressor (10) comprising a first member and a second member. The seal assembly (800) is disposed between the first member and the second member. The seal assembly (800) comprises: a seal member (820) having a first seal surface (822) abutting the first member and a second seal surface (824) abutting the second member; and a support member (840). The seal member (820) is provided with a seal member contact portion facing the first seal surface (822) and the second seal surface (824), and the support member (840) is provided with a support member contact portion engaging the seal member contact portion, resulting in the support member (840) being pushed towards the seal member (820) such that the seal member (820) abuts the first member and the second member. The seal assembly (800) can realize an axially flexible back pressure chamber with reliable sealing, while improving ease of assembly of associated seal components.
B: A plug door for a coach comprises a fixed support (1), a movable support (2), a plug switching mechanism (3), a pivoted arm linkage mechanism (4), a drive mechanism (5), and a door panel (6). The plug switching mechanism (3), the pivoted arm linkage mechanism (4), and the drive mechanism (5) enable the plug movement of the door panel (6) of the coach. The plug door provides a good seal and moves stably and reliably.
C: A channel sealing valve (22), a channel sealing mechanism (2) and a universal hysteroscope; the channel sealing valve (22) comprises: a first sealing member (221), having a first opening (2210); and a second sealing member (222), wherein the first sealing member (221) and the second sealing member (222) are stacked on each other, a protrusion portion (223) is formed by protruding from the position of the second sealing member (222) corresponding to the first opening (2210) in the direction away from the first sealing member (221), a buffer chamber (2230) is formed between the protrusion portion (223) of the second sealing member (222) and the first sealing member (221), and the protrusion portion (223) has a second opening (2220). The channel sealing mechanism (2) of the universal hysteroscope can well reduce the outflow of liquid from a working pipe (10) during passing of a working instrument (3), replacement of the working instrument (3), and a missing state of the working instrument (3), and maintain the liquid pressure in the working pipe (10) during use of the hysteroscope.
D: A triangular rotor pump, comprising a housing, the housing comprising a side wall (100), and a first end cover (210) and a second end cover (220) respectively disposed at two ends of the side wall (100), and further comprising a triangular rotor (300) in the housing and an eccentric assembly (400) that drives the triangular rotor (300), the triangular rotor (300) comprising a rotor body (310) and a sealing member (320) disposed on the rotor body (310), the sealing member (320) being an elastic structural member, the rotor body (310) comprising three top ends (312) and side surfaces (311) respectively facing the first end cover (210) and the second end cover (220), the sealing member (320) comprising three first sealing portions (321) respectively disposed at the three top ends (312), each first sealing portion (321) abutting against the inner surface of the side wall (100) to form a radial sealing surface that blocks adjacent working cavities, the sealing member (320) further comprising two second sealing portions (322), two second sealing portions (322) being respectively disposed at two ends of the rotor body (310) in an axial direction, and the second sealing portions (322) respectively abutting against the first end cover (210) and the second end cover (220) to form an end surface sealing surface, and two ends of the first sealing portion (321) being respectively clearance-free fit with the two second sealing portions (322). Thus, radial sealing and end surface sealing are implemented.
Answer: B