US 11,703,258 B2
Electronic expansion valve
Lei Zhou, Zhejiang (CN); Jiangnan Cai, Zhejiang (CN); and Yingchong Lu, Zhejiang (CN)
Assigned to Zhejiang Sanhua Intelligent Controls Co., Ltd., Shaoxing (CN)
Appl. No. 16/603,916
Filed by Zhejiang Sanhua Intelligent Controls Co., Ltd., Shaoxing (CN)
PCT Filed Apr. 3, 2018, PCT No. PCT/CN2018/081703
§ 371(c)(1), (2) Date Oct. 9, 2019,
PCT Pub. No. WO2018/188500, PCT Pub. Date Oct. 18, 2018.
Claims priority of application No. 201710234824.9 (CN), filed on Apr. 12, 2017.
Prior Publication US 2020/0124327 A1, Apr. 23, 2020
Int. Cl. F25B 41/35 (2021.01); F16K 1/32 (2006.01); F16K 1/50 (2006.01); F16K 31/50 (2006.01)
CPC F25B 41/35 (2021.01) [F16K 1/32 (2013.01); F16K 1/50 (2013.01); F16K 31/50 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An electronic expansion valve, comprising a valve component and a stator component, wherein the valve component comprises a valve body assembly, a valve core, a threaded transmission assembly and a rotor, the valve body assembly is provided with a valve port, and the valve core is configured to be driven by the threaded transmission assembly to control an opening of the valve port; a wear-resistant coating is applied to a contact surface of at least one of parts of the valve component, having relative movement, of the electronic expansion valve, the wear-resistant coating is applied by spraying, the wear-resistant coating has a thickness of 5 to 8 microns, and a material of the wear-resistant coating comprises a molybdenum disulfide material and a polytetrafluoroethylene material,
wherein the threaded transmission assembly comprises a screw rod and a nut, the screw rod is fixedly connected to the rotor, the screw rod is configured to drive the valve core to move, the nut is fixed to a fixed portion of the valve body assembly, the screw rod comprises an external threaded portion, the nut comprises an internal threaded portion, and the external threaded portion and the internal threaded portion are in threaded connection, and at least one of the external threaded portion and the internal threaded portion is coated with the wear-resistant coating,
the nut further comprises a lower guide portion, the lower guide portion is arranged below the internal threaded portion, a caliber of the lower guide portion is smaller than a caliber of the internal threaded portion, the lower guide portion is configured to guide movement of the valve core, and at least one of the lower guide portion and an outer surface of a portion of the valve core corresponding to the lower guide portion is coated with the wear-resistant coating,
wherein the nut comprises an inner side wall, an inner cavity of the nut is formed by the inner side wall, and the inner side wall further comprises an upper guide portion through which the screw rod runs, the internal threaded portion and the lower guide portion are formed on the inner side wall, the lower guide portion and the upper guide portion are respectively arranged at two sides of the internal threaded portion, a caliber of the upper guide portion is greater than the caliber of the internal threaded portion, and the upper guide portion is coated with the wear-resistant coating.