Refrigerating or heat pump and jet pump for use therein

Claim 1

A refrigerating system or heat pump comprising a compressor consisting of a jet pump (1; 24; 30), a condenser (3; 37) succeeding the jet pump and which produces condensate, and an evaporator (2), which communicates with the jet pump and which is adapted to produce an entrainable vapor, which is under low pressure and adapted to be sucked by the motive fluid into the suction space (13; 13a; 36, 37, 38) of the jet pump, wherein the suction space (13; 13a; 36, 37, 38) of the jet pump is preceded by means for throttling the condensate, characterized in that: the evaporator (2) constitutes at least part of the throttling means and comprises wall means (18; 18a; 39, 40, 41) made of porous material, preferably metallic material, such as particularly sintered metal, for flow of condensate and evaporation condensate therethrough, said wall means having a dwonstream surface and an upstream surface, the downstream surface (23, 23a) of said wall means constitutes at least a part of the boundary surface surrounding the suction space (13; 13a, 36, 37 38) of the jet pump (1; 24; 30) and is liquid-tightly sealed at its lateral edges, and at least those surface layers of said wall means (18; 18a; 18b; 39, 40, 41) which are on the upstream side in the direction of flow of the condensate and initially contacted thereby are permeable to condensate, said wall means (18, 18a; 18b; 39, 40, 41) is heat-conductively connected to a heat source, said heat source being constituted by a metallic heat transfer fluid line, said line being at least partly embedded in said wall means (18; 18a; 18b; 39, 40, 41), and said wall means (18; 18a; 18b; 39, 40, 41) encloses said suction space (13; 13a; 36, 37, 38) of said jet pump (1; 24; 30) at its periphery and is particularly concentrically arranged about the center line of the said pump (1; 24; 30).