Vacuum electro-spray ion source and mass spectrometer

A vacuum electro-spray ion source, comprising:

• a hollow capillary,
• a vacuum cavity,
• a gas inlet pipe,
• a gas supply device
• an adjusting device;
• and
• a three-way connector,
• wherein a first end of the hollow capillary is a sampling port, and a second end is used as a spray nozzle for vacuum electro-sprays and stretches into the vacuum cavity;
• the air pressure in the vacuum cavity is within a range of 10−4 to 200 Pa;
• one end of the gas inlet pipe stretches into the vacuum cavity, and the other end is connected with the gas supply device;
• and the adjusting device is configured for adjusting the gas inlet pipe to allow the gas to flow therein intermittently,
• wherein the gas inlet pipe comprises a first hollow pipe and a second hollow pipe;
• the second end of the hollow capillary sequentially passes through a first interface and a second interface of the three-way connector, and stretches into the vacuum cavity;
• an end of the first hollow pipe is connected with an end of the second hollow pipe within the three-way connector, and the other end of the first hollow pipe passes through the second interface, and stretches into the vacuum cavity;
• the other end of the second hollow pipe passes through a third interface of the three-way connector to be connected with the gas supply device, and
• wherein the gas inlet pipe further comprises a third hollow pipe and a silica gel collapsible hose;
• the adjusting device comprises a pinch valve;
• an end of the third hollow pipe is connected with an end of the second hollow pipe within the pinch valve via the silica gel collapsible hose, and the other end of the third hollow pipe is connected with the gas supply device, wherein the pinch valve is used for controlling the circulation of gas flows between the third hollow pipe and the second hollow pipe.