Flat-end heat pipe capable of increasing length of heat dissipation effective section of heat pipe

The utility model relates to a flat-head heat pipe capable of increasing the length of a heat dissipation effective section of the heat pipe, which comprises an outer sleeve, a sliding ring is connected inside the outer sleeve in a sliding manner, one side of the sliding ring is fixedly connected with an extension sleeve, one end of the extension sleeve extends to the outer side of the outer sleeve, two limiting grooves are symmetrically formed in an inner hole of the outer sleeve, and the outer sleeve is fixedly connected with the sliding ring. And two limiting blocks are symmetrically and fixedly connected to the outer side of the sliding ring. The beneficial effects of the utility model lie in that when the adjusting nut rotates, the extension sleeve cannot rotate due to the limiting block, so that the extension sleeve slides, the extension sleeve extends out of the outer sleeve, and the total length of the device can be controlled by adjusting the position of the extension sleeve, thereby achieving the pu