Classifications

• • 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
  • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
  • F24H1/06—Portable or mobile, e.g. collapsible
• • 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
  • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
  • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
  • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
  • F24H1/121—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using electric energy supply
  • F24H1/122—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using electric energy supply combined with storage tank
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
  • F24D17/00—Domestic hot-water supply systems
  • F24D17/0073—Arrangements for preventing the occurrence or proliferation of microorganisms in the water

Definitions

• the present invention relates to an electric heating machine, able to reduce the damp of wet cement in a screed.
• gas-fuelled burners are used which thus require the transport of gas cylinders to the place of use and their presence on site also during the night, with consequent risk to those handling or working in the presence of inflammable and potentially explosive material.
• the present invention thus sets out to resolve the drawbacks of the known technique and especially, those described above.
• Such objective is achieved by an electric heater according to claim 1 and by a drying assembly according to claim 24.
• FIG. 1 shows a schematic diagram of the assembly which the present invention relates to, in one possible embodiment.
• figure 2 shows a longitudinal cross-section of a detail of the assembly in figure 1.
• reference numeral 2 globally denotes an electric heater for reducing the damp of wet cement in a screed by means of heat exchange with a liquid.
• the electric heater 2 comprises an inlet duct 3, for the entrance of the liquid inside the machine 2, and an outlet duct 4, for the exit of the liquid from it.
• the ducts 3, 4 are reciprocally communicating.
• the inlet duct 3 is able to convey the incoming liquid along a longitudinal entrance axis Y, essentially coinciding with the axis around which the tubular wall of such duct extends.
• the electric machine 2 comprises, moreover heat exchange devices, in fluid communication with the inlet duct 3 and able to increase the temperature of the incoming liquid.
• the heat exchange devices comprise at least one heat exchanger 9, which has one heat exchanger wall 10 identifying a heating compartment 11.
• the heat exchanger wall 10 is tubular and extends around a heat exchanger axis X.
• the longitudinal entrance axis Y and heat exchanger axis X are parallel and coincident.
• the axes X, Y are staggered angularly and incident.
• the cross-section of transit of the liquid inside the heating compartment 11, is greater than that of the inlet duct 3, so as to slow down the flow of the liquid entering the compartment 11.
• the heating compartment 11 comprises deviator devices, able to create a path at least partially winding inside the heat exchanger 9.
• the deviator devices are able to angularly deviate the incoming liquid in relation to the longitudinal entrance axis Y.
• the incoming liquid is deviated in relation to the longitudinal entrance direction Y, so as to force such liquid to remain in the heat exchanger for a longer time but most of all to come closer to the wall of the heat exchanger 10.
• the heat exchanger wall 10 is the part of the heat exchanger having the highest temperature, thus ensuring the best heat exchange.
• the deviator devices comprise at least one deviator wall 12', 12" positioned at the inlet and/or outlet of the heating compartment 11.
• the wall 12' , 12" is shaped like a disc or pan, having a smaller diameter than the cross-section of the heating compartment 11.
• the heat exchanger 9 comprises a pair of walls 12', 12" both at the entrance and exit of the compartment 11.
• the deviator wall 12', 12" is able to transform the flow of incoming liquid from axial to radial in relation to the longitudinal entrance axis Y, as shown in figure 2.
• the heat exchanger 9 comprises in addition a resistor or coil 13, able to increase the temperature of the incoming liquid.
• the resistor 13 is electric and has a high heating capacity, for instance 1500 or 2500 Watt.
• the resistor 13 is positioned outside the heating compartment 11, in thermal contact with the heat exchanger wall 10.
• the temperature of the wall 10 is essentially the same as that of the resistor 13. This way, by using the heat conduction through and along the heat exchanger wall 10 it is possible to obtain a bigger heat exchange surface than the outer surface of a normal resistor.
• the resistor 13 is braze-welded to the heat exchanger wall 10, to improve reciprocal thermal contact.
• the resistor 13 is wound in a spiral manner around the heat exchanger axis X, for instance at a constant pitch, as shown in figure 2.
• the heat exchanger 9 comprises in addition an insulating coating (not shown), able to reduce the dispersion of heat through the heat exchanger wall 10.
• the insulating coating is positioned on the surface of the resistor 13 opposite that facing the heat exchanger wall 10, so as to form a thermally insulated compartment.
• the resistor 13 is positioned in the thermally insulated compartment included between the heat exchanger wall 10 and the insulating coating.
• the electric machine 2 comprises, moreover a tank 5, positioned downline of the heat exchange devices in relation to the direction of transit of the liquid.
• Such tank 5 is able to hold the heated liquid coming from the exchange devices and is in fluid communication with the outlet duct 4.
• the liquid coming from the exchange devices flows into the tank 5, so that this constitutes a storage vessel for the hydraulic circuit.
• the tank 5 may be insulated so as to reduce heat dispersion outwards.
• the tank 5 comprises a tank wall 6, which defines a collection compartment 7, where the heated liquid is collected.
• the electric machine 2 comprises further circulation devices, such as for instance a pump or circulator 15, able to make the liquid travel from the inlet duct 3 to the outlet duct 4, and vice versa through a circuit in thermal contact with the damp cement of the screed.
• circulation devices such as for instance a pump or circulator 15, able to make the liquid travel from the inlet duct 3 to the outlet duct 4, and vice versa through a circuit in thermal contact with the damp cement of the screed.
• the circuit comprises a path which extends inside the machine 2, between the inlet duct 3 and the outlet duct 4, and extends outside it too, along a drying duct 8, in thermal contact with the damp cement of the screed, that is through the floor heating panels.
• the drying duct 8 comprises the pipes of a plumbing system and/or the coils of a panel heating system.
• the electric machine 2 is portable, and the ducts 3, 4 comprise means of attachment and release such as to easily permit the connection and detachment of the machine 2 from the circuit.
• the electric machine 2 is of sufficiently limited weight/size to be easy to transport to the place of use.
• attachment and release mechanisms suitable for easily engaging to those of a pre-existing external circuit, permits a reduction of assembly and dismantling times of the machine having such circuit.
• the attachment and release mechanisms are of the type snap-on/off.
• the machine 2 comprises, in addition, anti-bacterial means, able to limit/prevent the formation of algae, fungi and/or similar, in the circuit, for instance in the tank 5 and/or in the heating compartment 11.
• the anti-bacterial means comprise a coating of an anti-bacterial agent on the surfaces of the walls 10, 6 facing the heating compartment 11 and/or collection compartment 7.
• the bactericide agent comprises copper.
• the anti-bacterial means comprise an anti-bacterial element 14, positioned inside the heating compartment 11 and extending parallel to the heat exchanger axis X.
• the anti-bacterial element comprises a cylinder mounted coaxially to the heat exchanger wall 10
• the electric machine 2 comprises a pair of deviator walls 12', 12", and the anti-bacterial element 14 extends between them.
• the electric machine 2 comprises temperature measurement devices, such as for instance a thermocouple, able to measure the temperature inside the circuit.
• temperature measurement devices such as for instance a thermocouple, able to measure the temperature inside the circuit.
• the electric machine 2 comprises, in addition, pressure measurement devices, such as a pressure gauge, able to measure the pressure inside the circuit.
• knowing the pressure and/or temperature values inside the circuit makes it possible, for example, to detect any leaks immediately or to prevent a pressure limit from being exceeded, beyond which the components of the system would be likely to break.
• the temperature and/or pressure measuring devices are located along the outlet duct 4.
• the electric machine 2 comprises, in addition, valve devices, such as, for instance, solenoid valves or manual valves which can be activated so as to allow/prevent the flow of liquid inside and/or outside the circuit.
• valve devices such as, for instance, solenoid valves or manual valves which can be activated so as to allow/prevent the flow of liquid inside and/or outside the circuit.
• the electric machine 2 comprises, in addition, safety and management devices, able to make adjustments for the safety and functioning of the machine 2.
• the safety and management devices are operatively connected to the heat exchange devices, the circulation devices, the temperature measuring devices, the pressure measuring devices and/or valve devices.
• the pressure measuring devices are able to detect the resulting loss of pressure and send a signal to the safety and management device, which stops the circulator 15 or acts on the valve devices so as to close off sections of the circuit and prevent it from emptying, or turns off the resistor 13 to prevent it from burning.
• the safety and management device would prevent such operation, blocking the power supply of the resistor 13 and/or circulator 15.
• the safety and management device would process the signal coming from the pressure measuring devices to open the vent valve 17, so as to reduce the pressure.
• the safety and management device comprises an electronic system which be controlled manually and/or automatically to perform said functioning and safety adjustments.
• a drying assembly 1 comprising an electric heating machine 2 according to any of the previous embodiments, and at least one drying duct 8.
• Such drying duct 8 may be fluidically connected to the inlet 3 and outlet ducts 4 of the electric machine 2 so as to form a circuit, and is suitable for being placed in thermal contact with the wet cement of the screed.
• the machine which the present invention relates to is easy to transport to wherever it is to be used and can be connected/detached very rapidly.
• the machine which the present invention relates to makes it possible to work in safety, both during the transport phase and during use.
• the machine which the present invention relates to enables completely safe functioning during the night too, when security staff are not on duty.
• the machine which the present invention relates to has the components most subject to wear, such as the circulator and the resistor, in an accessible position for replacement or regular maintenance operations.
• the heat exchanger and the resistor shown permit the best heat exchange with the liquid with the least possible external occupation of space by the heat exchanger.
• the presence of anti-bacterial means makes it possible to prevent the formation of colonies of bacteria in the circuit, which in the long term would reduce the cross-section of transit in the ducts, and therefore place greater strain on the circulation mechanisms.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Road Paving Machines (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Applications Claiming Priority (1)

Publications (2)

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ID=40301627

Family Applications (1)

Country Status (2)

Citations (5)

• 2008
  • 2008-06-19 IT ITBS20080124 patent/ITBS20080124A1/it unknown
• 2009
  • 2009-05-15 EP EP09160327A patent/EP2136149A3/de not_active Withdrawn

Patent Citations (5)

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