Electronic expansion valve, its coil device and tooling for the coil device

Abstract

The invention discloses a coil device used for an electronic expansion valve, comprising a coil pin, a circuit board and lead parts; the upper end of the circuit board is provided with a pin hole, and the coil pin is connected with the pin hole through the pin hole. The circuit board is welded and connected, and the lower end of the circuit board is provided with a connecting part, and the lead part is welded and conducted with the circuit board through the connecting part, and its welding surface is parallel to the lead wire length direction of the lead part. In the coil device provided by the present invention, the lead wires of the lead parts do not need to be bent when they are connected with the circuit board, thereby eliminating the hidden danger of bending and breaking of the welding roots of the lead parts due to stress during use, and improving the efficiency of the coil. device reliability. In addition, the invention also discloses an electronic expansion valve comprising the coil device. Furthermore, the invention also discloses a tool used for the coil device.

Description

technical field [0001] The invention relates to the technical field of electronic expansion valves, in particular to a coil device. In addition, the present invention also relates to an electronic expansion valve comprising the above-mentioned coil device. Furthermore, the present invention also relates to a tool for the above-mentioned coil device. Background technique [0002] Electronic expansion valves are commonly used in air conditioning systems as throttling control elements to control the flow of refrigerant in the system. [0003] The coil device of the electronic expansion valve includes a lead wire component, which is used to realize the circuit connection between the coil device and the air conditioner control panel. In the traditional structure, the lead parts and the coil are usually plugged and connected by the terminals of the lead parts and the coil pins. Due to the poor reliability of the connection structure, poor contact is prone to occur. At present, t...

AI Technical Summary

Problems solved by technology

[0008] As can be seen from the figure, when the lead part 1'3 is welded with the circuit board 1'2, the lead wire of the lead part 1'3 needs to pass through the lead hole 1'22 of the circuit board 1'2, when the circuit board 1'2 After welding with the coil pin 1'1 and the lead part 1'3 respectively, due to assembly requirements, the stress direction of the lead part 1'3 is the vertical direction, parallel to the plane of the circuit board 1'2, resulting in the lead part 1' 3 The end welded with the circuit board 1'2 is in a bent state, and the lead part 1'3 is easily broken during use, resulting in poor contact; moreover, the lead part 1'3 needs to pass through the circuit board 1'2 during welding. Lead hole 1'22, inconvenient positioning, affecting welding efficiency

[0009] The welding surface of the lead part 1'3 and the circuit board 1'2 and the welding surface of the coil pin 1'1 and the circuit board 1'2 are on the same plane of the circuit board 1'2. When assembling, when the lead part 1'3 and After the circuit board 1'2 is soldered, if the coil pin 1'1 is welded to the circuit board 1'2 by wave soldering at one time, it will cause secondary melting of the welding part of the lead part 1'3, which will affect the lead part 1'3 The continuity with the circuit board is 1'2, so only ordinary point-by-point welding technology can be used, and the production efficiency is low

[0010] The welding of the coil pin 1'1 and the circuit board 1'2 is single-sided welding, that is, the coil pin 1'1 is only connected to one side of the circuit board 1'2, when the solder joint of the coil pin 1'1 breaks , will cause the entire coil device to be disconnected and affect the use of the electronic expansion valve

[0011] In view of this, how to improve the structure of the coil device of the electronic expansion valve so that it can eliminate the hidden danger of breakage caused by the bending of the welding root of the lead parts, improve the reliability of the coil device, improve production efficiency, and reduce production costs is an issue in this field. Technical problems that technicians need to solve at present

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