Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
  • F28F9/02—Header boxes; End plates
  • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
  • F28F9/0265—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits by using guiding means or impingement means inside the header box
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
  • F24H9/00—Details
  • F24H9/12—Arrangements for connecting heaters to circulation pipes
  • F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
  • F24H9/133—Storage heaters

Definitions

• the present patent relates to an accumulator water heater with a deflector for cold- water intake.
• Accumulator water heaters currently known to the art can be gas or electrically powered. These generally comprise a tank- a cold water intake pipe that is inserted in the lower part of the water heater, an outlet pipe for the heated water that should be at a temperature of approximately 40-45° in order to be usable, taken from the uppermost part of the tank.
• Electric water heaters are equipped with a flange mounted with one or more electric resistances, a thermostat sheath containing one or more temperature sensors, and lastly an anti-corrosion device generally composed of a magnesium anode.
• the flange most commonly used is circular in shape and mounted on the exterior of the tank; however, it can often also be oval-shaped and mounted externally or on the surge tank. This flange can be removed for maintenance operations.
• the electric resistances mounted on the flange are adapted to heat the cold water as it enters, and can be either accordion or spiral type electric resistances in order to obtain a compromise between the need for adequate spiral length and the possibility of insertion and extraction of the flange on which the electric reistance is mounted.
• the thermostat sheath contains the temperature sensors. Said sensors may be electronic, bulb-type, or more commonly, rods composed of two materials with a different thermal dilatation coefficient, generally a brass rod with an invar core, that provides average temperature calculation along the length of the rod.
• the cold water that is introduced into the tank at the time the hot water is removed tends to mix with the water already contained in the tank, provoking a drop in the water temperature lower than that required for normal use. This results in a reduction of the quantity of the water that can be used before heating up, and therefore a reduction in performance and an increase in the delay period before the water is re-heated.
• the system used to reduce the mixing effect is to introduce the cold water in a direction as horizontal as possible and at very low speed. This tends to create a layer of cold water at the bottom of the tank limiting its mixing with the hot water and trying to prevent any vortex or turbulence.
• deflectors that are positioned above the end of the inlet pipe to prevent the cold water from being introduced in a vertical direction.
• these deflectors have a spherical or ellipsoid cover shape.
• inlet pipes with the end part closed and with side openings for water distribution can also be used.
• the aim of the present invention is to resolve at least part of the disadvantages in currently known accumulator water heaters, and in particular, those disadvantages described above. This aim is achieved through a water heater compliant with the description in claim
• - fig.1 is a plane view of the water heater
• - fig. 2 is a cross section of the water heater according to the line A- A in figure 1
• - fig. 3 is a view from above of the deflector according to a first embodiment
• - fig. 4 is a cross section of the deflector according to the line B-B in figure 3
• - fig. 5 is a cross section of the deflector according to the line A-A in figure 4
• - fig. 6 is a side view of the deflector according to a second embodiment
• FIG. 7 is a cross section of the deflector according to a third embodiment according to the line A-A; - fig. 8 is a cross section of the deflector according to the line B-B in figure 7.
• the reference numeral 1 in the drawings indicates an accumulator water heater comprising a tank 2, equipped with a closure element 3, a cold-water inlet pipe 4, and a hot water outlet pipe 6.
• the closing element 3 is composed of a flange mounted with heating means, such as electric resistances, means for controlling the accumulated water temperature, and anti-corrosion means.
• Flange 3 may be circular and mounted externally, or as in this case, it can be oval and mounted on the surge tank.
• the inlet pipe 4 introduces the cold water into the lower part of tank 2.
• the outlet pipe 6 enters the lower part of the tank and terminates at the upper end to take in the water heated to the required user temperature.
• a deflector 5 is set over the inlet pipe to deflect the cold-water flow in a horizontal direction as it enters the tank.
• the deflector 5 has a
• the deflector 5 has a first surface 11 slanting in an upwards direction, a second section 12, practically horizontal, and a third surface 13 slanting downwards.
• the deflector also has a fin 14, preferably less wide than the other surfaces, that extends in a practically horizontal direction to enable the deflector to be anchored to the bottom of tank 2, most commonly by welding.
• the deflector 5 is therefore fixed to the water heater tank 2, by the fin 14, so that the surfaces that form the characteristic "roof tile” structure are positioned over the cold water inlet pipe 4.
• the deflector 5 When the deflector is welded to the tank, the free edge of surface 11 is set adjacent to the surface of tank 2.
• the deflector 5 also has two side edges 15 adjacent to the surfaces 11, 12 and 13, slanting downwards and with chamfered edges.
• the said side edges 15 reinforce the structure providing the deflector 5 with extra rigidity and resistance.
• the deflector 5 has the form of the external surface of a half-cylinder.
• the deflector 5 is fixed directly to the inlet pipe 4 by means of an insert 16 having a width approximately equal to the internal diameter of pipe 4, to provide anchoring through shrink fitting on the inlet pipe 4.
• the water entering the tank separated by insert 16 is deflected sideways by two surfaces 17 very similar to the external surface of a half cylinder with a radius which increases as it extends outwards from the insert 16.
• the deflector 5 is preferable manufactured from moulded plastic material. According to another embodiment, the deflector 5 shown in figure 7 can also be fixed to the tank by means of a fin 14 similar to that described in the first two embodiments.
• the deflector is preferably manufactured from moulded sheet metal.
• the cold-water flow is prevented from moving in a vertical direction inside the tank 2, by the deflector 5, thus limiting the distribution to the bottom of the tank because of the predominantly horizontal water flow.
• the deflector 5 can be applied to both vertical and horizontal axis water heaters, and therefore can be mounted both on the top cover of the tank as well as on the screw attachment of the tank.
• the width of deflector 5, and therefore the section i ⁇ -side which the water is "directed" horizontally is approximately twice the size of the inlet pipe 4 diameter.
• the distance between the outlet opening and the deflector surface of deflector 5 is approximately equal to half the diameter of the inlet pipe 4.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Details Of Fluid Heaters (AREA)

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Cited By (4)

Families Citing this family (1)

Citations (3)

• 2004
  • 2004-03-01 IT IT000010A patent/ITAN20040010A1/it unknown
• 2005
  • 2005-02-21 WO PCT/IB2005/000467 patent/WO2005093337A1/it active Application Filing

Patent Citations (3)

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