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1. (WO2018101780) ELECTRONIC EXPANSION VALVE ALSO USEABLE AS CHECK VALVE AND COOLING/HEATING SYSTEM

Pub. No.:    WO/2018/101780    International Application No.:    PCT/KR2017/013966
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Fri Dec 01 00:59:59 CET 2017
IPC: F25B 41/06
F16K 15/02
F16K 27/02
Applicants: KEEHA PRECISION CO., LTD.
주식회사 기하정밀
Inventors: LEE, Chong-chun
이종천
LEE, Sang Bong
이상봉
Title: ELECTRONIC EXPANSION VALVE ALSO USEABLE AS CHECK VALVE AND COOLING/HEATING SYSTEM
Abstract:
The present invention relates to an electronic expansion valve also useable as a check valve and a cooling/heating system. According to an example, proposed is an electronic expansion valve also useable as a check valve, comprising: a body housing having a first port, a second port, and a lower-end fastening hole; an operation assembly that is installed inside the body housing and has an elevating rod; an orifice assembly installed on the lower side of the interior of the body housing through the lower-end fastening hole, the orifice assembly having an orifice housing that has a housing through-hole formed through the periphery thereof so as to form a second port and a channel, an orifice hole being formed on the upper end portion of the orifice assembly, a third port being formed inside the lower side of the orifice assembly, and the orifice assembly being configured to block the orifice hole when the elevating rod ascends and to expose the orifice hole when the elevating rod descends such that, by forming a channel between the second or third port and the first port, the orifice assembly performs an expansion valve function; a check valve switching unit installed in an annular distancing space between the upper periphery of the orifice assembly and the interior of the body housing, the check valve switching unit being configured to prevent a fluid introduced through the first port from passing through the annular distancing space when the elevating rod descends and to allow a fluid introduced through the second port or through the third port and the housing through-hole to pass through the annular distancing space when the elevating rod ascends, thereby performing a check valve function; and a port blocking unit installed in one selected from the second and third ports so as to block the flow of the fluid.