Abstract: Provided are a surface zwitterionized silicone antifouling coating and a preparation method thereof. In the disclosure, hydroxyl-terminated polydimethylsiloxane and N-aminoethyl-3-aminopropyl methyl dimethoxysilane are used as raw materials, and tetramethylammonium hydroxide pentahydrate is used as a catalyst, thereby preparing a series of polydimethylsiloxane resins containing amino side chains in different proportions; then side chain amino modified polydimethylsiloxane is crosslinked and cured by using 3-glycidyloxypropyltrimethoxysilane as a curing agent; after that, the cured silicone coating is soaked in a solution of 1,3-propane sultone in acetone for ionization.

Abstract: An oral irrigator, comprising: a first pumping assembly (200) used for pumping a first working medium for oral irrigation; a second pumping assembly (300) used for pumping a second working medium for oral irrigation; and a nozzle (400) in fluid communication with output ends of the first pumping assembly (200) and the second pumping assembly (300), the first working medium for oral irrigation and/or the second working medium for oral irrigation being ejected by means of the nozzle (400).

Abstract: The present invention relates to is a nozzle for an oral irrigator, comprising: a nozzle body; and a housing, in which an outlet is defined, wherein the housing is connected to one end of the nozzle body-(242), and defines, with the nozzle body, an accommodating cavity in communication with the air. Fluid for oral irrigation enters the accommodating cavity through the nozzle body, and is sprayed out via the outlet after being mixed with the air.

Abstract: A swing barrel type positive displacement pump using a cross shaft joint bearing includes a main shaft (1) for connecting with a motor. The upper part of the main shaft (1) is slantwise provided with a rotating barrel (2) which swings along with the rotation of the main shaft (1). The periphery of the rotating barrel (2) is evenly provided with more than three pin shafts (3). Each pin shaft (3) is sleeved with a cross shaft joint bearing (4). Each cross shaft joint bearing (4) includes a bearing (41) sleeved on the pin shaft (3). The outer ring of each bearing (41) is fixedly connected with a swing sleeve (42). Fixed shafts (421, 421?) with the same axis extend along the left and right sides of the swing sleeve (42), respectively. The fixed shafts (421,421?) are sleeved with a left and right bearing (43, 43?), respectively. The outer rings of the left and right bearings are fixedly connected with left and right cross shaft swing sleeves (44, 44?), respectively.

Abstract: A swing barrel type positive displacement pump using a cross shaft joint bearing includes a main shaft (1) for connecting with a motor. The upper part of the main shaft (1) is slantwise provided with a rotating barrel (2) which swings along with the rotation of the main shaft (1). The periphery of the rotating barrel (2) is evenly provided with more than three pin shafts (3). Each pin shaft (3) is sleeved with a cross shaft joint bearing (4). Each cross shaft joint bearing (4) includes a bearing (41) sleeved on the pin shaft (3). The outer ring of each bearing (41) is fixedly connected with a swing sleeve (42). Fixed shafts (421, 421?) with the same axis extend along the left and right sides of the swing sleeve (42), respectively. The fixed shafts (421,421?) are sleeved with a left and right bearing (43, 43?), respectively. The outer rings of the left and right bearings are fixedly connected with left and right cross shaft swing sleeves (44, 44?), respectively.