Electronic expansion valve and refrigeration device
An electronic expansion valve and a refrigeration device are provided. The electronic expansion valve has a valve seat, a nut and a connection piece. The valve seat is provided with a valve cavity. One end of the nut is installed in the valve cavity. An outer wall of the nut is provided with an annular position part that extends from the outer wall. The position part is positioned to be in contact with a wall of the valve cavity. One end of the connection piece is fixedly connected to the nut. Another end of the connection piece is extended away from the nut and fixedly connected to an axial end surface of the valve seat.
1 . An electronic expansion valve comprising:
a valve seat forming a valve cavity and comprising a wall;
a nut at least partially disposed within the valve cavity, the nut comprising:
an outer wall; and
a position portion protruding from the outer wall and contacting the wall of the valve seat, the position portion comprising:
a connection portion in interference fit with the wall of the valve seat; and
a tapered guide portion connected to the connection portion with a decreasing diameter away from the connection portion;
a balance channel that communicates two sides of the position portion in an axial direction;
a connection piece forming a balance hole that is in communication with the balance channel and communicates two sides of the connection piece in the axial direction, the connection piece comprising:
an inner end fixedly connected to the nut; and
an outer end away from the nut that is fixedly connected to an axial end surface of the wall of the valve seat; and
a housing comprising a housing axial end surface in contact with the axial end surface of the wall of the valve seat,
wherein:
a thickness of the wall of the valve seat is greater than a thickness of the housing at an intersection of the wall of the valve seat and the housing;
an outer surface of the wall of the valve seat and an outer surface of the housing are flush;
the outer end of the connection piece is fixedly connected to a portion of the axial end surface of the wall of the valve seat that is not connected to the housing; and
an annular gap is formed between the outer end of the connection piece and an inner wall of the housing.
2 . The electronic expansion valve according to claim 1 , wherein:
the connection piece is spaced apart from the position portion in the axial direction;
the connection piece, the position portion, and the wall of the valve seat form a first cavity; and
the balance channel and the balance hole communicate via the first cavity.
3 . The electronic expansion valve according to claim 1 , wherein the balance channel is formed by the position portion of the nut.
4 . The electronic expansion valve according to claim 1 , wherein the balance channel is formed by the wall of the valve seat.
5 . The electronic expansion valve according to claim 1 , wherein the connection piece is welded to the wall of the valve seat.
6 . The electronic expansion valve according to claim 1 , further comprising:
a valve stem;
a valve needle part connected to the valve stem; and
a valve core seat provided on the valve seat,
wherein:
the nut further comprises:
a thread section matched with the valve stem; and
a fixing section connected to the thread section;
the fixing section extends in a direction toward the valve core seat;
the valve needle part is matched with the fixing section; and
the connection piece and the position portion are disposed at an outer wall of the fixing section.
7 . The electronic expansion valve according to claim 6 , wherein:
the fixing section of the nut comprises an installation portion and an extension portion;
the installation portion is connected to the thread section;
the connection piece and the position portion are disposed on an outer wall of the installation portion;
one end of the extension portion is connected to the installation portion; and
another end of the extension portion extends in the axial direction.
8 . The electronic expansion valve according to claim 7 , wherein
an outer diameter of the extension portion is smaller than an outer diameter of the position portion.
9 . The electronic expansion valve according to claim 7 , wherein a gap is formed between the extension portion and the valve seat.
10 . The electronic expansion valve according to claim 7 , wherein the extension portion forms a diversion through hole.
11 . The electronic expansion valve according to claim 10 , wherein:
the extension portion forms a plurality of diversion through holes; and
the plurality of diversion through holes are provided around a periphery of the extension portion at intervals.
12 . The electronic expansion valve according to claim 7 , wherein the extension portion, the installation portion, and the position portion are integrally formed.
13 . A refrigeration device comprising the electronic expansion valve according to claim 1 .