Electronic expansion valve

An electronic expansion valve, comprising:

• a valve seat assembly;
• a first pipe connecting portion;
• and
• a second pipe connecting portion, wherein,
• the valve seat assembly comprises an outer wall portion and a valve port portion provided with a valve port,
• the electronic expansion valve comprises a first valve seat chamber and a second valve seat chamber, at least most part of the first valve seat chamber is located above the valve port portion, and at least most part of the second valve seat chamber is below the valve port portion, the valve port is configured to communicate the first valve seat chamber with the second valve seat chamber, the first pipe connecting portion is fixedly connected to the outer wall portion, and a connection portion between the first pipe connecting portion and the outer wall portion is relatively close to the first valve seat chamber, the second pipe connecting portion is fixedly connected to the outer wall portion, and a connection portion between the second pipe connecting portion and the outer wall portion is relatively close to the second valve seat chamber, a diameter of the second valve seat chamber relatively close to the valve port portion is greater than a diameter of the second pipe connecting portion, and the diameter of the valve port is less than a diameter of the second valve seat chamber,
• wherein the electronic expansion valve further comprises:
• a magnetic rotor assembly, a screw rod valve needle assembly and a nut assembly,
• wherein the screw rod valve needle assembly includes a screw rod, a valve needle, a sleeve portion, a spring and a support member, the screw rod is in floating connection with the valve needle through the sleeve portion, the sleeve portion is in cup shape with an open bottom on the bottom thereof, the valve needle passes through the opening and enters into the first valve seat chamber to be matched with the valve port for adjusting, the spring is provided in the sleeve portion, one end of the spring is supported to the sleeve portion, and the other end of the spring is supported to the support member coupled with the valve needle, so as the valve needle is able to move up and down within a certain stroke relative to the sleeve portion;
• wherein the nut assembly is provided with a through hole in the axial direction thereof, the screw rod passes through the through hole and is threaded connected with the nut assembly, so that when the magnetic rotor assembly rotates, the screw rod linked with the magnetic rotor assembly makes an upward and downward movement relative to the nut assembly while rotating, thereby driving the valve needle to do the lifting movement.

An electronic expansion valve, comprising:

• a valve seat assembly;
• a first pipe connecting portion;
• and
• a second pipe connecting portion, wherein,
• the valve seat assembly comprises an outer wall portion and a valve port portion provided with a valve port,
• the electronic expansion valve comprises a first valve seat chamber and a second valve seat chamber, at least most part of the first valve seat chamber is located above the valve port portion, and at least most part of the second valve seat chamber is located below the valve port portion, the valve port is configured to communicate the first valve seat chamber with the second valve seat chamber, the first pipe connecting portion is fixedly connected to the outer wall portion, a connection portion between the first pipe connecting portion and the outer wall portion is relatively close to the first valve seat chamber, the second pipe connecting portion is fixedly connected to the outer wall portion, and a connection portion between the second pipe connecting portion and the outer wall portion is relatively close to the second valve seat chamber, an average diameter of the second valve seat chamber is greater than a diameter of the second pipe connecting portion, and a diameter of the valve port is less than a diameter of the second valve seat chamber, and the diameter of the valve port is less than a diameter of the second pipe connecting portion,
• wherein the electronic expansion valve further comprises:
• a magnetic rotor assembly, a screw rod valve needle assembly and a nut assembly,
• wherein the screw rod valve needle assembly includes a screw rod, a valve needle, a sleeve portion, a spring and a support member, the screw rod is in floating connection with the valve needle through the sleeve portion, the sleeve portion is in cup shape with an open bottom on the bottom thereof, the valve needle passes through the opening and enters into the first valve seat chamber to be matched with the valve port for adjusting, the spring is provided in the sleeve portion, one end of the spring is supported to the sleeve portion, and the other end of the spring is supported to the support member coupled with the valve needle, so as the valve needle is able to move up and down within a certain stroke relative to the sleeve portion;
• wherein the nut assembly is provided with a through hole in the axial direction thereof, the screw rod passes through the through hole and is threaded connected with the nut assembly, so that when the magnetic rotor assembly rotates, the screw rod linked with the magnetic rotor assembly makes an upward and downward movement relative to the nut assembly while rotating, thereby driving the valve needle to do the lifting movement.