Vacuum drying and solvent recovery device

A vacuum drying and solvent recovery device, comprising a vacuum drying system for drying an ink jet printing (IJP) ink by volatilizing a solvent in the IJP ink and a solvent recovery system for recovering the solvent volatilized from the IJP ink;

• wherein the vacuum drying system comprises a vacuum chamber and a vacuum exhaust pump set connected to the vacuum chamber;
• the solvent recovery system comprises a plurality of solvent recovery chambers, an exhaust gas treatment unit coupled to the plurality of solvent recovery chambers and a valve switching unit for selectively conducting the vacuum exhaust pump set, one of the plurality of solvent recovery chambers and the exhaust gas treatment unit;
• in use, the vacuum exhaust pump set provides a negative pressure environment to the vacuum chamber, so that the solvent in the IJP ink is volatilized under the negative pressure environment of the vacuum chamber and is extracted from the vacuum chamber by the vacuum exhaust pump set to dry the IJP ink;
• the valve switching unit connects the solvent recovery chamber with the vacuum exhaust pump set, so that gas discharged from the vacuum exhaust pump set is conducted into the solvent recovery chamber and cooled by the solvent recovery chamber to condense and recovery the solvent, and to discharge remaining gas to the exhaust gas treatment unit for exhaust gas treatment;
• or the valve switching unit directly connects the exhaust gas treatment unit with the vacuum exhaust pump set, so that the gas discharged from the vacuum exhaust pump set is conducted to the exhaust gas treatment unit for exhaust gas treatment.