| 摘要 |
An electrical water heating device for use in a closed circuit heating system, such as a central heating system, includes a horizontally elongated hollow cylindrical body having a top, bottom and a pair of opposite ends. At least two electric heating elements are mounted opposite to each other on the same horizontal level in the body at both ends thereof and the body has a water outlet and a water inlet centrally located, respectively, in the top and bottom thereof. Two identical T-shaped nozzles are mounted in a symmetrical manner to the inlet and the outlet of the device, respectively, by a short vertical bar of the nozzle. Each nozzle includes elongated closed-end horizontal bar provided with two sets of holes symmetrical with respect to the vertical bar of the nozzle. Each set of holes includes a first hole smaller in diameter than the inner diameter of the horizontal bar and located eccentrically in the closed end of the horizontal bar, a plurality of second holes of the same diameter as the first hole located close to each other in the vicinity of the end of the horizontal bar and each having an axis parallel to that of the vertical bar and three identical third holes each having a diameter smaller than the first and second holes and located along a helicoidal line extending from vertical bar of the nozzle to the second holes with the axis of the second of these third holes extending parallel to the axis of the vertical bar. The size and position of the holes improves circulation of water in the vicinity of the heating elements.
|
