Expansion assembly and hot water tank

Abstract

An expansion assembly for use in a hot water device, having a water container for receiving water to be heated, includes an expansion tank with a lower expansion tank half shell and an upper expansion tank half shell. The lower expansion tank half shell has a coupling portion for coupling to the water container of the hot water device. The upper expansion tank half shell is configured to be coupled to a cold water feed line. The upper expansion tank half shell and the lower expansion tank half shell are hermetically connected at circumferential edges forming the expansion tank.

1 . An expansion assembly for use in a hot water device having a water container for receiving water to be heated, the expansion assembly comprising:
 an expansion tank including a lower expansion tank half shell and an upper expansion tank half shell; wherein   the lower expansion tank half shell has a coupling portion configured to couple to the water container of the hot water device,   upper expansion tank half shell is configured to be coupled to a cold water feed line, and   the upper expansion tank half shell and the lower expansion tank half shell are connected hermetically at circumferential edges, forming the expansion tank.   
     
     
         2 . The expansion assembly according to  claim 1 , wherein the upper expansion tank half shell and the lower expansion tank half shell each have a circumferential friction welding edge to create a vibration friction welding connection of the upper expansion tank half shell and the lower expansion tank half shell. 
     
     
         3 . The expansion assembly according to  claim 1 , wherein the lower and/or the upper expansion tank half shell include a seat for a nozzle of a water jet pump, wherein the water jet pump is formed between the connected expansion tank half shells. 
     
     
         4 . The expansion assembly according to  claim 1 , further comprising an emptying component having a venturi nozzle configured to drain expansion water from the expansion tank. 
     
     
         5 . The expansion assembly according to  claim 4 , wherein the nozzle has a parabolically tapering cross-sectional shape. 
     
     
         6 . The expansion assembly according to  claim 4 , wherein the nozzle is comprised of a different material than the material of the expansion tank. 
     
     
         7 . The expansion assembly according to  claim 4 , wherein the nozzle is formed integrally with, and integrated into, the upper expansion tank half shell, or the lower expansion tank half shell. 
     
     
         8 . The expansion assembly according to  claim 1 , wherein the upper expansion tank half shell and the lower expansion tank half shell are embodied as easily demoldable plastics parts. 
     
     
         9 . The expansion assembly according to  claim 4 , wherein an opening between the emptying component and the expansion tank is sealed by a sealing unit that includes a ball resting on a sealing element when the expansion tank is empty such that a negative pressure within the expansion tank is prevented. 
     
     
         10 . The expansion assembly according to  claim 9 , wherein the sealing unit has a second ball and a vertical guide for guiding the second ball onto the sealing element and away from the same, respectively. 
     
     
         11 . The expansion assembly according to  claim 1  further comprising a venting component arranged at the upper expansion tank half shell and configured to allow air to be exchanged between the expansion tank and the atmosphere. 
     
     
         12 . The expansion assembly according to  claim 11 , wherein the venting component has a blocking element configured to prevent water from leaking out of the expansion tank via the venting component. 
     
     
         13 . (canceled) 
     
     
         14 . The expansion assembly according to  claim 12 , wherein the blocking element is a swelling disk. 
     
     
         15 . The expansion assembly according to  claim 1  further comprising an emptying component. 
     
     
         16 . The expansion assembly according to  claim 15 , wherein the lower and/or the upper expansion tank half shell include a seat for the emptying component, wherein the seat is formed between the expansion tank half shells. 
     
     
         17 . A hot water tank comprising:
 a storage tank;   a cold water feed line coupled to the storage tank and configured to connect to a water supply network;   a hot water outlet coupled to the storage tank and configured to provide hot water at a fitting connectable thereto; and   an expansion assembly including an expansion tank having a lower expansion tank half shell and an upper expansion tank half shell, wherein the lower expansion tank half shell has a coupling portion configured to couple to the water container of the hot water device, wherein the upper expansion tank half shell is configured to be coupled to a cold water feed line, and wherein the upper expansion tank half shell and the lower expansion tank half shell are connected hermetically at circumferential edges, forming the expansion tank.   
     
     
         18 . The hot water tank according to  claim 17 , wherein the upper expansion tank half shell and the lower expansion tank half shell each have a circumferential friction welding edge to create a vibration friction welding connection of the upper expansion tank half shell and the lower expansion tank half shell. 
     
     
         19 . The hot water tank according to  claim 17 , wherein the lower and/or the upper expansion tank half shell include a seat for a nozzle of a water jet pump, wherein the water jet pump is formed between the connected expansion tank half shells. 
     
     
         20 . The hot water tank according to  claim 17 , wherein the expansion assembly further includes a venting component arranged at the upper expansion tank half shell and configured to allow air to be exchanged between the expansion tank and the atmosphere.