Plate heat exchanger

Claim 2

In the plate heat exchanger, the combination of an assembly of heat exchanger plates disposed in substantially parallel relation to form a series of interspaces, one said interspace being provided between each pair of adjacent plates, gasket means sealing off each second plate interspace from the surrounding atmosphere along the periphery of the adjacent plates forming said second interspace, and permanent joints sealing off the other interspaces from the surrounding atmosphere and located between the adjacent plates forming said other interspaces, each plate having a heat exchanging surface and pressed corrugations in said surface, each plate also having pressed grooves around said surface for receiving said gasket means, each plate being provided with inlet and outlet ports for two heat exchanging media, said permanent joints being formed along abutting bottoms of said pressed grooves of the respective adjacent plates, the seals formed by the permanent joints and the seals formed by the gasket means being disposed in substantially aligned relation across the plate heat exchanger.

Claim 3

The combination of claim 1, in which said permanent joints are formed by seam welding along said abutting bottoms of the pressed grooves.

Claim 4

The combination of claim 1, in which said permanent joints are formed by gluing.

Claim 5

The combination of claim 1, in which each said plate has four of said inlet and outlet ports, one port being located in each of four corner portions of the plate, said pressed grooves of each plate surrounding an area of the plate including said heat exchanging surface thereof and two of said ports serving as inlet and outlet ports, said pressed grooves also separately surrounding each of the other two ports of the plate, said permanent joints being formed along abutting bottoms of all said pressed grooves of the respective adjacent plates.

Claim 6

In a plate heat exchanger, the combination of an assembly of heat exchange plates disposed in substantially parallel relation to form a series of interspaces, one said interspace being provided between each pair of adjacent plates, gasket means sealing off each second plate interspace from the surrounding atmosphere along the periphery of the adjacent plates forming said second interspace, and permanent joints sealing off the other interspaces from the surrounding atmosphere and located between the adjacent plates forming said other interspaces, each plate having a heat exchanging surface and pressed corrugations in said surface, the plates also having pressed grooves around said surfaces for receiving said gasket means, the plates being provided with inlet and outlet ports for two heat exchanging media, said permanent joints being formed along abutting bottoms, of said pressed grooves of the respective adjacent plates, the seals formed by the permanent joints and the seals formed by the gasket means being disposed in substantially aligned relation across the plate heat exchanger, the bottom of the gasket groove of each plate having a narrow flat central portion along which the permanent joint is formed, the groove also having two lateral portions forming an obtuse angle both with said central part and with the respective side walls of the groove.

Claim 7

In a plate heat exchanger, the combination of an assembly of heat exchange plates disposed in substantially parallel relation to form a series of interspaces, one said interspace being provided between each pair of adjacent plates, gasket means sealing off each second plate interspace from the surrounding atmosphere along the periphery of the adjacent plates forming said second interspace, and permanent joints sealing off the other interspaces from the surrounding atmosphere and located between the adjacent plates forming said other interspaces, each plate having a heat exchanging surface and pressed corrugations in said surface, the plates also having pressed grooves around said surfaces for receiving said gasket means, the plates being provided with inlet and outlet ports for two heat exchanging media, said permanent joints being formed along abutting bottoms, of said pressed grooves of the respective adjacent plates, the seals formed by the permanent joints and the seals formed by the gasket means being disposed in substantially aligned relation across the plate heat exchanger, the bottom of the gasket groove of each plate having a narrow flat central portion along which the permanent joint is formed, the groove also having two lateral portions forming an obtuse angle both with said central part and with the respective side walls of the groove.