Small-size axial powder feeding inner hole plasma spraying gun

A small-size axial powder feeding inner hole plasma spraying gun, comprising:

• a front gun body provided with a first through hole;
• a nozzle with one end fixed on one side of the front gun body through a nozzle gland and the other end penetrating through the first hole to extend to the other side of the front gun body,
• wherein a spray hole channel is coaxially arranged in the nozzle;
• a rear gun body;
• an insulator arranged between the front gun body and the rear gun body, and fixedly connected to both the front gun body and the rear gun body,
• wherein the insulator is provided with a second through hole, and the rear gun body is provided with a third through hole;
• and the first through hole, the second through hole and the third through hole are coaxially arranged;
• a powder feeding frame fixedly connected to the rear gun body, wherein an interior of the powder feeding frame is provided with a powder inlet channel, and one side of the powder feeding frame close to the rear gun body is provided with a powder feeding joint;
• and the powder inlet channel is communicated with a channel of the powder feeding joint;
• a cathode the second through hole and the third through hole, wherein a cathode seat of the cathode is connected to the powder feeding joint, a cathode head penetrates through the second through hole to extend into the spray hole channel of the nozzle, and an annular cavity is formed between the cathode head and an inner wall of the spray hole channel;
• and
• a powder feeding hole channel is coaxially arranged in the cathode, one end of the powder feeding hole channel is communicated with the channel of the powder feeding joint, and the other end of the powder feeding hole channel is communicated with the spray hole channel;
• and the powder feeding hole channel is coaxially arranged with the spray hole channel;
• an air inlet channel arranged on the front gun body and communicated with the annular cavity;
• and
• a cooling channel with an interior introduced with cooling water, and is configured to guide the cooling water along a path that passes through the front gun body, through an outside area of the nozzle and an outside area of the cathode in a surrounding manner, and then through the rear gun body,
• wherein an outside of the cathode is provided with an annular radiating fin at the corresponding cooling channel,
• wherein the cooling channel comprises a water inlet channel, a first annular water cavity, a water passing channel, a second annular water cavity and a water outlet channel which are communicated in sequence;
• the water inlet channel is arranged in the front gun body;
• the first annular water cavity is arranged in the front gun body and arranged around an outer wall of the nozzle;
• the second annular water cavity is arranged in the rear gun body, and the annular radiating fin is located in the second annular water cavity;
• the water passing channel penetrates through the insulator to communicate the first annular water cavity with the second annular water cavity;
• and
• the water outlet channel is arranged in the rear gun body.