| CPC F16K 37/005 (2013.01) [F16K 27/029 (2013.01); F16K 31/04 (2013.01); F16K 31/508 (2013.01); F24F 11/63 (2018.01); F25B 41/35 (2021.01); H05K 13/04 (2013.01); F25B 41/34 (2021.01); F25B 2341/068 (2013.01)] | 11 Claims |
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1. An electronic expansion valve, comprising a valve core assembly,
an electronic control portion and a stator assembly,
wherein the valve core assembly comprises a valve port, a valve core and a rotor assembly, the valve port is arranged in a valve seat, and the valve core is movable relative to the valve seat to change an opening of the valve port;
the electronic control portion is configured to control the stator assembly, and the rotor assembly is configured to drive the valve core to move; and
the electronic expansion valve further comprises a sensor comprising a sensor body, a sensing head and a pin, the sensor body comprises a main body portion, the sensor is a temperature sensor or a pressure sensor or a temperature and pressure sensor, the electronic control portion comprises an electronic control board, and the stator assembly and the sensor are electrically connected with the electronic control board,
wherein the electronic control portion further comprises a cover body, the cover body is provided with an inner cavity, the electric control board is arranged in the inner cavity;
the cover body comprises an upper housing and a lower housing, and the upper housing and the lower housing are separately formed and are fixedly connected with each other; and
the lower housing is provided with a through hole, and the pin is capable of passing through the through hole,
wherein the electronic expansion valve further comprises a valve body, and the valve body comprises a first inlet, a first outlet, a second inlet and a second outlet; a first channel is formed between the first inlet and the first outlet, and a second channel is formed between the second inlet and the second outlet;
at least part of a valve seat is arranged in the first channel or a first chamber in communication with the first channel, and a sensing head is located in the second channel or a second chamber in communication with the second channel; and
the sensor is directly welded to and fixedly connected to the valve body in a sealing manner, or the sensor is fixedly connected to the valve body through a first position-limiting portion, and the first position-limiting portion at least limits rotation of the sensor relative to the valve body,
wherein the first position-limiting portion comprises an intercommunicating hole and an external-thread segment, the main body portion of the sensor is capable of passing through the intercommunicating hole, and the valve body comprises an internal-thread segment at a position corresponding to the second chamber;
the sensor body further comprises a flange portion, the flange portion is arranged between the main body portion and the pin, an outer diameter of the flange portion is larger than the outer diameter of the main body portion, the flange portion is incapable of passing through the intercommunicating hole, a lower end surface of the flange portion is in contact with the valve body, and the first position-limiting portion is arranged around a periphery of the main body portion and is limited by the flange portion; and
the external-thread segment is in threaded connection with the internal-thread segment,
wherein a sealing ring is arranged between the sensor and the valve body;
the sensor body further comprises a connecting portion, and the connecting portion is arranged between the flange portion and the sensing head; and
a diameter of the connecting portion is smaller than the diameter of the main body portion, a stepped portion is formed by the connecting portion and the lower end surface of the flange portion, and the sealing ring is arranged between the valve body and the lower end surface of the flange portion.
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