Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a sandwich-type ultrasonic transducer front shroud sub-assembly, composed of a front shroud (100) and a mounting pad (300), wherein the front shroud (100) comprises a front shroud cylinder (3), a front shroud top face (1), a front shroud bottom face (4) and a front shroud screw hole (5); the mounting pad (300) comprises a mounting pad cylinder (38) and a mounting pad through hole (30), and the mounting pad through hole (30) is located in the mounting pad cylinder (38); and the front shroud (100) is disposed in the mounting pad through hole (30), and the front shroud top face (1) is in direct contact with a space (28) at one end of the mounting pad through hole (30). Further disclosed is a sandwich-type ultrasonic transducer equipped with the sub-assembly.
A: A turnover beam and a refrigerator provided with the turnover beam. The turnover beam comprises a front cover plate (1), a rear cover plate (2), a mounting seat (3) and an elastic structure (4). A cavity is formed by the front cover plate (1) and the rear cover plate (2) which are matched with each other; the mounting seat (3) and the elastic structure (4) are arranged in the cavity; the mounting seat (3) comprises a fixing position (32) connected with a door body, and a rotating shaft (31) articulated with a hole (11) formed in the front cover plate (1); the rotating shaft (31) is provided with a limit stopper (33); one end of the elastic structure (4) is fixed in the cavity, and the other end of the elastic structure is a free end; the elastic structure is matched with the limit stopper (33) in an elastic way; when the door body is arranged at two limiting positions, the free end of the elastic structure (4) is arranged at the two sides of the limit stopper (33); when the door body is arranged between the two limiting positions, the free end of the elastic structure (4) is matched with the limit stopper (33) in a way of elastic extrusion.
B: Provided are a refrigerator (3), a door body (1) for the refrigerator (3), and a disassembly method for a display control component (10) of the door body (1). The refrigerator (3) comprises a refrigerator body (2) and a door body (1). The door body (1) comprises: a panel (30) comprising a hollow-out window (31); a door liner (40); a pre-embedded box (20), the front end of which is provided with an installation opening (21) corresponding to the hollow-out window (31), the pre-embedded box (20) being provided between the panel (30) and the door liner (40); and the display control assembly (10), which comprises a touch display screen (120), an installation plate frame for fixing the touch display screen (120), and a front cover plate (130) provided at the front side of the installation plate frame, and is configured to pass through the hollow-out window (31) and the installation opening (21) as a whole in sequence and then be installed in the pre-embedded box (20) from front to rear. The front cover plate (130) is detachably connected to the installation plate frame, and the installation plate frame is detachably connected to the pre-embedded box (20) both by means of snap fit connection. The disassembly method comprises: releasing the snap fit connection between the front cover plate (130) and the installation plate frame, and removing the front cover plate (130) from the installation plate frame; and releasing the snap fit connection between the installation plate frame and the pre-embedded box (20), and detaching the installation plate frame and the touch display screen (120) from the interior of the pre-embedded box (20).
C: A thinned liquid crystal display comprises: a body (10), a mounting seat (20) arranged on the body (10), a mounting rack (30) arranged in the mounting seat (20), a plurality of PCB boards (40), each of which is mounted on the mounting rack (30) and is electrically connected to the body (10), and a cover plate (50) arranged on the mounting seat (20) as a cover. In the thinned liquid crystal display, the mounting seat (20) connected to a front shell (12) of the body (10) and located at a side edge of the body (10) of the liquid crystal display is arranged, a mounting rack (30) is arranged in the mounting seat (20), and a plurality of PCB boards (40) is mounted in the mounting rack (30) in a layered manner, so the space required for mounting the PCB boards (40) is saved, and the liquid crystal display is integrally thinned. Meanwhile, a mounting seat cover plate (50) independent of a back shell (14) of the body (10) of the liquid crystal display is arranged, so that, instead of dismounting the back shell (14), only the cover plate (50) needs to be detached to maintain the PCB boards (40), which is convenient to operate. The cover plate (50) completely covers an opening between the mounting seat (20) and the body (10), so as to not only guard against dust but also keep the appearance of the entire liquid crystal display complete.
D: Disclosed is an ultrasonic cleaning device, comprising a cleaning tank (10), a tap (20), an ultrasonic cleaning mechanism (30) and a positioning mechanism. The ultrasonic cleaning mechanism (30) is provided with an ultrasonic generator (31), a protective sleeve (32), a balancing weight (35), a lead (33) and an ultrasonic transducer (34), wherein the cleaning tank (10) is provided with a through hole (11), and the inner diameter of the through hole (11) is greater than the outer diameter of the protective sleeve (32); the protective sleeve (32) is sleeved on the lead (33) and passes through the through hole (11); an upper end of the lead (33) is electrically connected to the ultrasonic transducer (34), and a lower end of the lead (33) is electrically connected to the ultrasonic generator (31); an upper end of the protective sleeve (32) is fixedly connected to the ultrasonic transducer (34), and a lower end of the protective sleeve (32) is fixedly connected to the lead (33); the balancing weight (35) is located below the through hole (11), and the balancing weight (35) is detachably fixed on the protective sleeve (32); and the positioning mechanism is arranged on the cleaning tank (10) or the tap (20), and the positioning mechanism is provided with a positioning hole for arranging the ultrasonic transducer (34). By means of the arrangement, the ultrasonic cleaning device is easier to use and is very safe, and same can achieve automatic storage of the ultrasonic transducer.
Answer: D