Three-wall water injection hole packer for coal mines

A three-wall water injection hole packer for coal mines comprises a core part of the hole packer, and an outer cavity formed by a capsule, the core part of the hole packer is of a two-layer structure formed by an inner cavity and a middle cavity, the two ends of the core part of the hole packer are provided with an end channel I and an end channel II respectively, the outer wall of the core part of the hole packer is provided with a water injection channel and threads for connecting the core part of the hole packer and the capsule, and a sealing body is arranged in the capsule and used for sealing water in the outer cavity. According to the three-wall water injection hole packer for coal mines, due to the fact that small holes are formed in the outer wall of the middle cavity, water flow enters the outer cavity through the outer wall of the middle cavity so that the capsule can be propped open and can also enters the middle cavity of the hole packer connected with the channels through the channels in the two ends of the middle cavity, the fixation and hole sealing effects are achieved, water injected into a coal seam can reach places needing water through the channels in the hole packer, the three cavities are formed by three walls, and therefore pressure water used for sealing holes and the water injected into the coal seam can be separated from each other and will not be mixed.