One-way valve and air conditioning unit

The invention provides a one-way valve and an air conditioning unit, relates to the technical field of fluid control valves, and provides a novel one-way valve structure. The one-way valve provided by the invention has the characteristic of high reliability, the one-way valve can be mounted and used horizontally/vertically due to the inclined design of the filtering part, the limitation of the using direction is eliminated, the one-way valve can realize circulation and sealing of a refrigerant only by utilizing the pipeline pressure difference and the gravity action, other auxiliary accessories (such as a reset spring) do not need to be added, and the cost is reduced. Materials are reduced, so that the effects of reducing cost and improving reliability can be achieved; the shell and the fixing part play a role in fixing and supporting the filtering part, and the filtering part plays a role in blocking and guiding the solid stop ball, so that the problems of untight sealing and refrigerant leakage caused by de