Electronic expansion valve and its refrigeration system

Abstract

The invention provides an electronic expansion valve and a refrigeration system with the same. Among them, the electronic expansion valve includes: valve seat; valve needle, with open and closed positions; driving mechanism, including rotor and coil; planetary gear reduction mechanism, including planet carrier, planet wheel and gearbox, rotor, planet carrier and gearbox Coaxial setting, the rotor is fixedly connected with the planetary carrier to drive the planetary carrier to rotate along its axis, the planetary gear is sleeved on the first installation shaft, the gearbox includes a box body, a fixed ring gear and an output ring gear, and the planetary gear is simultaneously connected with the The fixed ring gear meshes with the output ring gear; the transmission mechanism includes a nut and a screw rod, the first end of the screw rod is fixedly connected with the output ring gear ring, and the second end of the screw rod abuts against the valve needle so that the valve needle Moves between an open position and a closed position. The application of the technical solution of the present invention can effectively solve the problem that the electronic expansion valve in the prior art cannot meet the requirements of high precision and miniaturization while increasing the flow adjustment range.

Description

technical field [0001] The invention relates to the field of refrigeration, in particular to an electronic expansion valve and a refrigeration system having the same. Background technique [0002] figure 1 A typical deceleration electronic expansion valve structure is shown. The deceleration electronic expansion valve for inverter air conditioner is mainly composed of two parts, one part is the valve body part for flow regulation, and the other part is the coil part for driving. The coil part includes: permanent magnet stepper motor 1', gear reducer 2' with three-stage reduction, threaded secondary structure 5' that converts the motor's rotational motion into the vertical motion of the screw rod 3', and the valve body includes a valve seat 10', and core components such as the spring 7 that controls the lift of the valve needle 8. The working principle of the above-mentioned electronic expansion valve is introduced below: First, the electronic controller of the air conditio...

AI Technical Summary

Problems solved by technology

There are two ways to increase the reduction ratio: one is to increase the reduction ratio of the gears at all levels, that is, to increase the number of teeth of the large gear, but the above structure will inevitably lead to an increase in the outer diameter of the large gear, resulting in an increase in the volume of the gear reducer. Big

The other is to increase the number of stages of gear reduction, but the above structure will inevitably lead to an increase in the number of gears, which will also lead to an increase in the volume of the gear reducer

In the end, the requirements of high precision and miniaturization cannot be met

In addition, the increase in the number of stages will also lead to a decrease in the transmission efficiency and stability of the entire system

At the same time, there is room for improvement in the structure of the gearbox

Images