Abstract: An electronic expansion valve includes a valve seat assembly, a first pipe connecting portion, and a second pipe connecting portion. The valve seat assembly includes an outer wall portion, a valve port portion having a valve port, a first valve seat cavity, and a second valve seat cavity. The first valve seat cavity is located above the valve port portion. The second valve seat cavity is located below the valve port portion. The valve port is capable of communicating with the first valve seat cavity and the second valve seat cavity. The first pipe connecting portion is fixedly connected to the outer wall portion located above the valve port portion. The second pipe connecting portion is fixedly connected to the outer wall portion located below the valve port portion. The inner diameter of the second valve seat cavity is greater than the inner diameter of the second pipe connecting portion.

Abstract: A monocular snapshot four-dimensional imaging method and system are provided. The method includes constructing a numerical simulation model of an imaging system, and optimizing a phase distribution of an entrance pupil plane of the imaging system to determine a point spread function and a lens parameter corresponding to the phase distribution; building the imaging system, calibrating the point spread function, and obtaining a distortion parameter of the imaging system; taking a single shot on a target scene to obtain a single encoded image containing four-dimensional light field information of the target scene, and correcting the single encoded image according to the distortion parameter of the imaging system; and decoding the four-dimensional light field information of the target scene from the single encoded image according to the calibrated point spread function to obtain an intensity image, a polarization contrast image and a depth map of the target scene.

Abstract: An electronic expansion valve includes a valve seat assembly, a first pipe connecting portion, and a second pipe connecting portion. The valve seat assembly includes an outer wall portion, a valve port portion having a valve port, a first valve seat cavity, and a second valve seat cavity. The first valve seat cavity is located above the valve port portion. The second valve seat cavity is located below the valve port portion. The valve port is capable of communicating with the first valve seat cavity and the second valve seat cavity. The first pipe connecting portion is fixedly connected to the outer wall portion located above the valve port portion. The second pipe connecting portion is fixedly connected to the outer wall portion located below the valve port portion. The inner diameter of the second valve seat cavity is greater than the inner diameter of the second pipe connecting portion.