Electronic expansion valve

Abstract

The invention discloses an electronic expansion valve which comprises a valve body (1) and a coil (2), wherein the coil (2) is connected with a buckle (4) conductively connected with the valve body (1), the coil (2) comprises an electromagnetic polar plate (21), a stator housing (22) which is in conductive contact with the electromagnetic polar plate (21) and a non-conductive plastic housing (23) wrapped on the outer part of the stator housing (22), the buckle (4) is in further conductive contact and connection with a transition part, and the transition part is in conductive contact with the stator housing (22). Due to the adoption of a structure design, the electronic expansion valve can ensure that parts inside the coil (2) are grounded, therefore, the coil (2) can be prevented from being damaged due to a high-voltage or ultra-high voltage electric signal.

Description

technical field [0001] The invention relates to the technical field of refrigerant fluid control components, in particular to an electronic expansion valve. Background technique [0002] The stepping motor direct-acting electronic expansion valve is another basic part of the four basic parts of the refrigeration system except the evaporator, compressor and condenser, and is the key part to adjust the flow of the system. The stepping motor direct-acting electronic expansion valve includes two parts: a coil and a valve body, wherein the valve body is equivalent to the rotor part of the stepping motor, and the coil is equivalent to the stator part of the stepping motor. The signal, the claw pole of the magnetic conductor of the coil produces a regular magnetic field movement, which drives the rotation of the rotor inside the valve body to adjust the flow rate at the valve port of the valve body, thereby realizing the regulation and control of the flow rate in the system. The e...

AI Technical Summary

Problems solved by technology

[0005] In the above structure, when the electrical signal is abnormal inside the plastic casing 2'3, such as the voltage rises or becomes ultra-high voltage, in order to prevent the coil 2' from being damaged, the stator casing inside the coil 2' needs to be 2'2 or the electromagnetic pole plate 2'1 is grounded, thereby leading out high voltage electricity; in the above structure, parts such as the electromagnetic pole plate 2'1 and the stator shell 2'2 are injected into the interior of the plastic shell 2'3 through the injection molding process , wherein the stator shell 2'2 and the electromagnetic pole plate 2'1 are in contact with each other, but there is no contact between the buckle 4' and the stator shell 2'2 due to the isolation of the plastic shell 2'3, thus Cannot be grounded

In the above structure, such as figure 2 As shown, the only parts inside the coil 2' that may be in contact with the valve body 1' are the claw poles in the inner hole of the magnetizer. However, since the fit between the coil 2' and the valve body 1' is a clearance fit, it cannot be absolutely Ensure that the claw poles in the inner hole of the magnetic conductor are in contact with the valve body 1', that is, when the electrical signal inside the coil 2' becomes high voltage or ultra-high voltage, the coil 2' may still be damaged because the grounding cannot be guaranteed

Images