What are the patterns of Iron Man's chest energy pile in the first generation and the second generation?

In fact, the reactor in the movie has been changed four times. The first is the first crude reactor that tony made during his kidnapping, and the second is the one that tony made after he came back. He asked pepper to change it for him. Both of them are palladium-powered and round, and they all appear in Iron Man One. In Iron Man II, the original circular palladium reactor became a triangular new element reactor. The Avengers I should be used in this reactor. In Iron Man III, there was another one. The triangle was bigger and the whole reactor was simpler. Now Baidu's pictures are incomplete. I have to go through the movies to make up the screenshots of several reactors. I wonder which reactor picture you want in LZ? Figure 1 shows his first reactor, which was later given to pepper, and was decorated by pepper and returned. The second reactor is Iron Man II, the third is the triangular new element reactor, and the fourth is the new element reactor lit up. The one in Iron Man III didn't find the picture.