Absorption refrigerator with additional means for defrosting the refrigerator

Claim 2

In an absorption refrigeration apparatus having an inert gas and provided with a circuit for absorption liquid working medium, a gas circulation system including an evaporator and absorber, a vapor expulsion unit, a condenser connected to said vapor expulsion unit for delivering liquid to the evaporator to produce a refrigerating effect, the improvement comprising; a vessel in said apparatus, means for transfering the liquid working medium from one part of the refrigeration apparatus to said vessel located at a higher level than said one part, a vent pipe conducting gas from said condenser, a first conduit connecting said vent pipe to said vessel, said first conduit functioning as a bubble pump by means of said inert gas being drawn from said condenser through said vent pipe, and a second conduit connected to said vent pipe and having liquid therein, the level of liquid in said bubble pump when no gas is supplied being located above the connection of said vent pipe to said pump but below the connection of said pump to said vessel.

Claim 3

In an absorption refrigeration apparatus having an inert gas and provided with a circuit for absorption liquid working medium, a gas circulation system including an evapOrator and absorber, a vapor expulsion unit, a condenser connected to said vapor expulsion unit for delivering liquid to the evaporator to produce a refrigerating effect, the improvement comprising; a defrosting arrangement for said refrigeration apparatus having a vessel and wherein said gas circulation system is provided with a liquid seal in said vessel, said seal being temporarily open to permit the circulation of a gas and temporarily blocked during defrosting, a siphon for emptying said liquid seal in said vessel after said blocking period, a vent pipe conducting gas from the condenser, a first conduit connecting said vent pipe to said vessel, said first conduit functioning as a bubble pump by means of said inert gas being drawn from said condenser through said vent pipe, a second conduit connected to said vent pipe and conducting weak absorption liquid to said vent pipe, and a branch pipe connecting said second conduit to said absorber, said bubble pump being connected to said seal at a point higher than the inlet of said branch pipe to said absorber.

Claim 4

In an absorption refrigeration apparatus having an inert gas and provided with a circuit for absorption liquid working medium, a gas circulation system including an evapOrator and absorber, a vapor expulsion unit, a condenser connected to said vapor expulsion unit for delivering liquid to the evaporator to produce a refrigerating effect, the improvement comprising; a defrosting arrangement for said refrigeration apparatus having a vessel and wherein said gas circulation system is provided with a liquid seal in said vessel, said seal being temporarily open to permit the circulation of a gas and temporarily blocked during defrosting, a siphon for emptying said liquid seal in said vessel after said blocking period, a vent pipe conducting gas from the condenser, a first conduit connecting said vent pipe to said vessel, said first conduit functioning as a bubble pump by means of said inert gas being drawn from said condenser through said vent pipe, a second conduit connected to said vent pipe and conducting weak absorption liquid to said vent pipe, and a branch pipe connecting said second conduit to said absorber, said bubble pump being connected to said seal at a point higher than the inlet of said branch pipe to said absorber.

Claim 5

An absorption refrigeration apparatus as claimed in claim 1 wherein said absorber is provided with one gas-conveying conduit connected to the top of said seal, and another gas-conveying conduit in said seal having a part extending outside said seal, said one gas-conveying conduit and said part of the other gas-conveying conduit being operatively connected to said liquid seal and inclined relative to said seal whereby liquid working media in said conduits flow in the direction from the liquid seal through said conduits.

Claim 6

An absorption refrigeration apparatus as claimed in claim 1 wherein said absorber is provided with an extension in the form of a U-shaped pipe having legs which are gas-conveying conduits, said conduits being operatively connected to said liquid seal and being inclined so that the liquid working media flow in the direction from the liquid seal through said conduits.

Claim 7

An absorption refrigeration apparatus as claimed in claim 1 wherein a gas-blocking means is provided in said vessel with a larger liquid collecting area below the gas flow blocking level than above this level.

Claim 8

An absorption refrigeration apparatus as claimed in claim 5 further comprising a siphon in said vessel having a top level above the gas flow blocking level so as to lower the liquid in the vessel to a predetermined level below the gas flow blocking level.