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: Provided are a method for machining a device and the device. The method for machining a device includes die bonding, primary dicing, filling by a baffle wall material, grinding and secondary dicing. In the step of grinding machining, a semi-finished product is placed on a platform surface of a grinding and fixing platform, a grinding working end of a grinding device is controlled to operate, and with the platform surface of the grinding and fixing platform as a height reference, the grinding working end grinds from above the semi-finished product toward the grinding and fixing platform and operates to a preset height. Through the special machining process, the probability of the appearance of white glue on a top surface of the device is reduced, which is conducive to ensuring a production yield of the device.

Abstract: A thermal expansion valve includes a power head and a valve body. The power head and the valve body are fixedly arranged. The power head includes a power head cover, a power head seat, and a membrane. The membrane includes a membrane recess and a corrugated portion. The membrane recess is located at the center position of the membrane. The corrugated portion is located at the peripheral position of the membrane recess. The membrane recess is recessed away from the power head cover. The valve body comprises a top portion. The top portion is provided with an opening. At least a part of the power head is extended into the opening. With an axial direction of the valve body as a projection direction, a projection of the power head towards the top portion falls on the top portion.

Abstract: A control box includes a female connector part and a male connector part. The plug end is housed in the female connector part when the male connector part is connected to the female connector part. The plug end is configured to plug into a power supply device when the male connector part is detached from the female connector part.

Abstract: A thermal expansion valve includes a power head and a valve body. The power head and the valve body are fixedly arranged. The power head includes a power head cover, a power head seat, and a membrane. The membrane includes a membrane recess and a corrugated portion. The membrane recess is located at the center position of the membrane. The corrugated portion is located at the peripheral position of the membrane recess. The membrane recess is recessed away from the power head cover. The valve body comprises a top portion. The top portion is provided with an opening. At least a part of the power head is extended into the opening. With an axial direction of the valve body as a projection direction, a projection of the power head towards the top portion falls on the top portion.