The object of the invention consists in an instant electric water heater, of reduced dimensions, for both domestic and industrial use, maximally optimizing its yield with a minimum energy consumption and continuous hot water flow, without temperature or flow losses occurring.
Electric water heaters usually contain a large volume of water which must remain enclosed, ready for use, in a relatively isolated vessel, with the subsequent expense for maintaining the temperature of that large water mass.
Furthermore, once hot water comsumption has begun, the hot water is limited over time, since once the hot water stored in the vessel is consumed, the heater is not able to heat water at the rhythm of consumption, therefore the water temperature abruptly drops, with the corresponding inconveniences and discomforts.
These electric heaters take a fairly long time from when they are connected until they are able to supply hot water at a certain temperature.
Conventional heaters have a large volume, often difficult to hide or conceal with the furniture, and are therefore difficult to install in a special area.
Other kind of electric heater is disclosed in the patents
The object of the invention of the patent
The heater disclosed in the patent
The object of the invention of the patent
The present invention is an instant water heater of continuous cyclic rate and reduced dimensions, it is very useful for preventing the previous drawbacks and for replacing large boilers, normally gas and potentially dangerous boilers, supplying hot water for consumption, and at the same time, acting as a hot water supply for heating units.
The heating of the water is carried out by means of an electric heater group with a fork shape or the like, submerged in a heat-transfer oil, or a similar fluid, which is kept hot and at a constant temperature due to the effect of the heater, this heat-transfer oil being of a minimum volume. The water to be heated circulates through two shunted coils surrounding the heater group, also being submerged in the heat-transfer oil. This heater-coil-heat transfer oil assembly is housed in a suitably sealed and pressurized internal vessel.
To maintain water flow and to minimize pressure and flow losses, the two shunted coils are provided with a single common external water inlet, whereas the outlet of each coil is independent, which outlet is arranged outside the internal vessel, on which a second vessel, also sealed and of reduced dimensions to prevent thermal inertia, has been installed; both water outlets of the coils are mixed in this external vessel and are homogenized until their outlet, as hot water, through a hole made in the external vessel.
A hollow bushing incorporating a stopper and which keeps the two vessels equidistant passes through the two vessels, at the same time allowing the filing of the heat-transfer oil and pressurizing of the internal vessel.
The hot water outlet of the external vessel, together with a direct cold water inlet like the one entering the heater to the coils, are collected by a thermostatic valve, which regulates the final water outlet temperature, thus always keeping it uniform.
The outlet of this thermostatic valve is connected in tandem to a pressure switch which, taking the temperature data collected by a probe installed inside the internal vessel as a reference, will provide the corresponding connection or disconnection instructions to the heater group.
An insulating layer surrounding the external vessel has been arranged to prevent the system from losing heat to the outside.
All this is proposed to be manufactured in a reduced and compact shape.
The following figures are included to facilitate understanding of the invention:
A preferred embodiment of the invention, which is to be understood in a broad and non-limiting sense, is detailed below.
A temperature measuring probe (16) is installed in the internal vessel (2) to control the temperature of the heat-transfer oil.
The two coils (4, 5) are arranged in shunt with a single external cold water inlet (6), which is shared between the two coils, and two independent water outlets (20); this allowing minimization of losses of pressure and flow to the outside of the internal vessel (2). The internal vessel (2) is surrounded by a sealed external vessel (1) of reduced dimensions to prevent thermal inertia, and it is where the two exiting water flows of the internal vessel are mixed and homogenized, and where the water continues to be heated since it is in contact with the walls of the internal vessel (2), which is hot because it contains the heat-transfer fluid heated by the heater group (3).
The external vessel (1) is provided with a hole with a water outlet (7) through which the heated water is evacuated.
The cold water inlet (13) going into the heater splits into Lwu channels, the first channel is the water inlet (6) to the coils (4, 5) and the second channel is a conduit (19), the opposite end of which ends, together with the hot water outlet (7) of the external vessel (1), in a thermostatic valve (14), where both hot and cold water currents are mixed, and where the temperature of the outlet water is finally regulated, thins always keeping it at a uniform temperature.
The thermostatic valve (14) outlet is connected in tandem with a pressure switch (15) which is connected to the probe (16) for measuring Lhe temperature of the heat-transfer oil of the internal vessel (2). The pressure switch (15) will connect or disconnect the heater group (3) according to the data of the heat-transfer oil temperature collected by the probe (16).
After passing through the pressure switch, the suitably heated water passes to the network or is directly used.
A hollow bushing (8) incorporating a stopper (9) passes through the two external (1) and internal (2) vessels, and keeps the two vessels (1, 2) equidistant, at the same time allowing the filling of fluid and pressurizing of the internal vessel (2).
The two vessels (1, 2) share a common base (17) which the support base (18) of the heater group (3) is coupled to by means of nuts (11) and screws (10).
An insulating layer (12) surrounding the external vessel has been arranged to prevent the assembly from losing heat to the exterior.
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