Heating-power expansion valve

Abstract

The invention relates to thermostatic expansion valve. It includes one air box head set on the valve body to control secondary refrigerant flow rate. The air box head has sealed chamber formed by diaphragm and outer wall, realize sealing by filling into secondary refrigerant from the hole. Its features are that the hole is set at the bottom of out wall cove; end plate is discoid and set jut which is connected with the bottom to seal the hole by electric resistance welding; cove inner clearance is formed around the end plate. The end plate of the invention is set clearance and connected with the cove of the air box head out wall which can process welding between them without electrical on-state. Thus it can prevent poor bonding, proof strength under-capacity.

Description

technical field [0001] The invention relates to a thermal expansion valve, in particular to a thermal expansion valve used in a vehicle air-conditioning and refrigeration system. Background technique [0002] There are many types of thermal expansion valves used in refrigeration cycles, such as JP-Ping 8-226567 bulletin. This thermal expansion valve includes the following: the high-pressure refrigerant passage for the refrigerant to flow into the evaporator and the low-pressure refrigerant passage for the refrigerant to flow out of the evaporator, A valve body with a valve hole in the middle of the above-mentioned high-pressure refrigerant flow path, a valve core part that changes the opening of the valve hole by touching or leaving the valve hole of the valve body, and a drive rod to drive the valve to control the movement of the valve body. The diaphragm of the core part, the airtight chamber filled with the temperature-sensitive gas isolated by the ...

AI Technical Summary

Problems solved by technology

[0008] In the conventional thermal expansion valve, in order to form the welded cone surface, the head is formed with a protrusion and a cone shape, and the hole in the outer wall is inclined downward toward the center to form a peripheral part. The processing process is complicated.

[0009] The thermal expansion valve scheme of secondary welding is adopted, and the projection welding is welded along the whole circumference of the spherical surface, which may cause insufficient welding strength

[0010] Moreover, in the previous thermal expansion valve, there may be welding between the hole on the outer wall and the head, and it is difficult to achieve a stable welding state.

[0011] In addition, in the previous thermal expansion valve, when the outer wall hole and the head were welded, there was a possibility that the welding reliability was not sufficient

[0012] In addition, when the spherical head is obliquely welded, the contact with the hole is uneven, and poor welding may occur

Images