| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inflow preventing device of impurities for preventing the impurities generated when solder melts by heat in a vacuum heater from entering a vacuum measurement device, preventing the impurities from accumulating in the vacuum measurement device, and also accurately measuring the degree of vacuum in the vacuum heater. Ž<P>SOLUTION: The inflow prevention device of impurities couples the vacuum heater for heating a metal box and a lid under vacuum and welding them with solder with the vacuum measurement device for measuring the degree of vacuum in the vacuum heater. A cylindrical metallic connecting pipe 3 is protrusively provided at right angles on a cylindrical metallic supporting pipe 2, having both ends opened and capable of connection. An inflow preventive tool 3, having a plurality of inflow preventing plates 7 fixed at predetermined intervals to a tip of a support rod 6 protrusively provided at the center of a fixed plate 5, is inserted from one of openings 11 in the support pipe 2 and mounted. A plurality of connecting holes 8 are formed on each inflow preventing plate 7, and in addition, the inflow preventing plate 7 is provided so that the connection holes 8 have a shape with the adjacent inflow preventing plates 7 intersecting with one another. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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