Electrical water heating device with improved internal circulation

Claim 1

In an improved electrical water heating device of the type comprising a horizontal elongated hollow body having a top, a bottom, and a pair of opposite ends, at least two heating elements mounted opposite each other at the same horizontal level in the body at both ends thereof, a water inlet centrally located in the bottom of the body and a water outlet having the same diameter as said inlet centrally located in the top of the body, the improvement comprising first and second identical nozzles mounted in said body in a symmetrical manner, said first nozzle connected to said inlet and said second nozzle connected to said outlet of the device, each of said first and second nozzles comprising a first vertical tubular section having a diameter substantially equal to the diameter of said inlet and outlet of the device, respectively, and a second horizontal tubular section connected to and having substantially the same diameter as the first tubular section, said second tubular section extending perpendicularly to one end of the first tubular section and connected thereto at its midpoint to form together with said first tubular section a hollow T-shaped element; the other end of said first tubular section of one of the first and second nozzles being connected to the inlet and the other end of the first tubular section of the other nozzle being connected to the outlet, said second section which forms the horizontal bar of the T being closed at both ends and provided with two sets of holes that are symmetrical with respect to a plane passing through the longitudinal axis of the first section perpendicularly to the axis of the second section; each set of holes in said second tubular section comprising a pair of first circular holes, each having a diameter smaller than the inner diameter of the second section and on an axis parallel to that of the second section, one of said first holes being eccentrically located on each closed end of the second section, said set of holes also comprising identically shaped second holes, each having a diameter equal to that of the first hole and an axis parallel to the longitudinal axis of the first section, said second holes being located close to each other at the vicinity of the closed ends of the second section and opening in the same direction as the first section, each set of holes further comprising three identical third holes each having a diameter smaller than that of the first and second holes, said third holes being located a short distance from each other according to a helicoidal line extending from the first section toward the closed end of the second section, the axis of the second of said third holes extending parallel to the longitudinal axis of the first section and opening in the same direction as the latter.