Please select the most similar patent number from A, B, C and D. Which number is?
A nozzle structure of a multifunctional water flosser, and a water flosser consisting of same. The nozzle structure of the water flosser consist of an inner nozzle core (1) and a nozzle housing (2); the middle of an end surface of an end portion of the inner nozzle core (1) inwardly recessed to form a water gathering cavity (11), multiple tangential water inlet flow channels (12) are provided on the periphery of the water gathering cavity (11), and the center of the water gathering cavity (11) is provided with a columnar water inlet (13); the inner nozzle core (1) is provided with a first flow channel (14), and the first flow channel (14) has one end communicated with the columnar water inlet (13), and the other end used as a columnar water interface (15); the inner nozzle core (1) is further provided with a second flow channel (16), and the second flow channel has one end communicated with the tangential water inlet flow channels (12), and the other end used as an umbrella-shaped water interface (17); and a water inlet (22) is formed in the outer peripheral surface of the inner nozzle core (1) circumferentially corresponding to the nozzle housing (2), and the water inlet (22) is connected to either the columnar water interface (15) or the umbrella-shaped water interface (17) in an alternated manner.
A: Provided is a nozzle assembly of a biological printer, comprising an installation block (3) having a channel (5), and a nozzle (1) installed in the channel (5), wherein a first flow channel (4) is disposed in the installation block (3), with one end of the first flow channel (4) being provided with an end opening (41) in communication with the channel (5); the nozzle (1) comprises an equal-diameter portion (12) and a diameter-reducing portion (13) away from and close to an outlet (6) of the channel (5), respectively; a second flow channel (7) is formed between the diameter-reducing portion (13) and the channel (5); an opening can be formed between the diameter-reducing portion (13) and the end opening (41); the opening is in communication with the first flow channel (4) and the second flow channel (7); and the equal-diameter portion (12) can seal the end opening (41). The flow area of the nozzle assembly can be conveniently adjusted by changing the relative position between the diameter-reducing portion (13) and the end opening (41).
B: A water pump, comprising a shell (15), a filter device (16), an electric motor housing (17), an electric motor, a volute (14) and an impeller (19), wherein the volute (14) is positioned between the filter device (16) and an outer housing (171), and the volute (14) is connected to the filter device (16) and the outer housing (171); the volute (14) is provided with a chamber (1) and a spiral flow channel (2) in communication with the chamber (1); the chamber (1) is provided with a water inlet (3) and water intake holes (4) provided on the periphery of the water inlet (3); the water inlet (3) and the water intake holes (4) are all in communication with a water output end (23); a connecting position (8) connected to the water output end (23) is also configured on the periphery of the water inlet (3); a gap is formed between the connecting position (8) and the water output end (23); the spiral flow channel (2) is provided with a water outlet (5) in communication with a water output portion (21); the water outlet (5) is provided with first notches (6); a first water flow channel is formed between the first notches (6) and an inner wall of the shell (15), and is in communication with a water cooling cavity (24); recesses (7) are arranged on the periphery of the volute (14); and a second water flow channel is formed between the recesses (7) and the inner wall of the shell (15), and is in communication with the water cooling cavity (24) and the gap between the connecting position (8) and the water output end (23). The water pump has a simple structure, can cool down the temperature of the electric motor, and can improve a heat dissipation effect.
C: Provided is an oral cavity cleaning device, comprising: a body (1), a water outlet nozzle (2), a first motor (3), a second motor (4), a brush head (5) and a water absorption component (6); a rotating shaft (12) extends outside the upper end surface of the body (1), the rotating shaft (12) is driven by the first motor (3) to vibrate and drive the brush head (5) to vibrate; the upper end surface of the body (1) is also provided with a water outlet (11), the water outlet nozzle (2) is provided on the upper end surface of the body (1) and communicates with the water outlet (11); in addition, the water outlet nozzle (2) is located on the side of the brush head (5) facing the human body, and the height of the water outlet nozzle (2) is located below the bristles of the brush head (5); the second motor (4) drives the water absorption component (6) to pump water from the built-in or external container, and spray the water from the water channel inside the body (1) through the water outlet (11) and the water outlet nozzle (2), thus, the oral cavity can be rinsed auxiliarily while brushing the teeth.
D: The present application relates to a cleaning machine, comprising a base (8) having a vacuum pump and a booster pump, and a washing sprayer (1). A clean water barrel (4) and a waste water barrel (9) are provided at left and right sides of the base (8). The washing sprayer (1) is provided with a nozzle (2) and a plurality of water-absorbing holes (11) surrounding the nozzle (2). The washing sprayer (1) is connected to the air inlet hole of the vacuum pump by means of a connection hose (3). A water outlet pipe (31) is provided in the connection hose (3). One end of the water outlet pipe (31) is connected to the nozzle (2), and the other end is connected to the water outlet of the booster pump. A water outlet hole is provided at the bottom of the clean water barrel (4). A water return hole is provided at the bottom of the waste water barrel (9). One-way valves are respectively provided in the water outlet hole and the water return hole. The base (8) is provided with a water pumping joint inserted in the water outlet hole and connected to the water inlet hole of the booster pump, and a waste water joint inserted in the water return hole and connected to the air exhaust hole of the vacuum pump. Opening pins capable of opening the one-way valves are respectively provided in the water pumping joint and the waste water joint. According to the present application, waste water produced by cleaning can be pumped while the cleaning liquid is sprayed for cleaning, thereby avoiding secondary pollution caused by the waste water produced during cleaning.
Answer: C