Helium mass spectrometer leak detector suction gun for spacecraft leak detection

The invention discloses a helium mass spectrometer leak detector suction gun for spacecraft leak detection. The helium mass spectrometer leak detector suction gun comprises an external structure and an internal structure. The external structure comprises a medical needle, a suction gun rod, a front cavity chamber, a middle cavity chamber, a rear cavity chamber, a suction gun handle and a flexible pipe which are mechanically connected and arranged in turn. The suction gun handle is arranged below the three cavity chambers. The flexible pipe is arranged on the lower end of the handle and used for being connected with a leak detector. The internal structure comprises sealing rubber rings, a filtering sheet, a cylinder with a hole and a conical head, a connecting rod and a pressure regulating column which are arranged in turn. The rear end of the suction gun rod and an air outlet end of the front cavity chamber are respectively provided with the sealing rubber rings and the filtering sheet. The two sealing rings