초록 ▼

In a plate heat exchanger the plate interspaces form first flow passages (13, 15; 15a) for a first fluid and other flow passages (14) for a second fluid. The plates have openings which for one of the fluids form one inlet channel (10) and one outlet channel (10a) through the plate package, the chann

In a plate heat exchanger the plate interspaces form first flow passages (13, 15; 15a) for a first fluid and other flow passages (14) for a second fluid. The plates have openings which for one of the fluids form one inlet channel (10) and one outlet channel (10a) through the plate package, the channels communicating with each other through the first flow passages (13, 15; 15a). A by-pass passage (15; 15a) is formed by at least one of the first flow passages and gives a through flow resistance that is substantially smaller than that given by each one of the other (13) first flow passages. In the inlet channel (10) or the outlet channel (10a), or in both channels, a valve member (17; 18; 26) is arranged for setting of a desired flow through the by-pass passage (15; 15a).

대표청구항 ▼

[ What is claimed is:] [1.] A plate heat exchanger, which comprises a plurality of plates (2-4) arranged to form a plate package having plate interspaces and in whichthe plates have through openings forming an inlet channel (10) and an outlet channel (10a) through the plate package for a liquid,cert

[ What is claimed is:] [1.] A plate heat exchanger, which comprises a plurality of plates (2-4) arranged to form a plate package having plate interspaces and in whichthe plates have through openings forming an inlet channel (10) and an outlet channel (10a) through the plate package for a liquid,certain of the plate interspaces form first flow passages (13, 15, 15a) for said liquid and other plate interspaces form second flow passages (14) for a fluid, which upon through flow of said second flow passages (14) gives off heat to or receives heat from said liquid--through at least some of said plates--when the liquid flows through said first flow passages (13, 15, 15a), andsaid inlet channel (10) communicates with said outlet channel (10a) through said first flow passages (13, 15, 15a),wherein said first flow passages comprise a plurality of heat exchange passages (13), which are adapted for an effective heat transfer between said liquid and said fluid, and are shaped to provide a certain flow resistance for through flow of said liquid, and at least one by-pass passage (15, 15a), which is adapted for a less effective or no heat transfer between said liquid and said fluid, and is shaped to provide a through flow resistance substantially smaller than that provided by each one of said heat exchange passages (13),further wherein at least one valve member (17, 18, 26) is provided and is arranged to move to different positions in order to provide a desired liquid flow rate through the at least one by-pass passage (15, 15a),further wherein the at least one by-pass passage (15, 15a) is formed between two plates, one of which is an end plate (3) in said plate package, so that a main plane of the at least one by-pass passage differs from, but is substantially in parallel with, a main plane of each one of said heat exchange passages, andfurther wherein the through flow area of the at least one by-pass passage (15, 15a) is larger than that of each one of said heat exchange passages (13).