Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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ELECTROVALVE
The present invention relates to an ~lectrovalve,
"normally opened", and to its us~ in hot water p~oduction
devices.
In the industry of the electrical household appliances
using water it is necessary to provide electrovalves to ;
control the feeding ducts.
These electrovalves are always of the normally closed
type, that is to say closed in rest position, when the -;
feeding in water has to be interrupted particularly when
the apparatus is not under tension. They have as their
function to close the duct in order to avoid any outflow.
There do not exist electrovalves for household appliances
which on the contrary are always opened in rest position,
that is to say when they are not under tension.
The invention has for aim to realize a normally opened
electrovalve intended to close a duct when it is under
tension.
The invention has for its object a normally opened
electrovalve comprising a body, a supple deformable mem-
brane which is perforated at its periphery, reinforced in
its center by means oE a resting member, both provided
with a central opening, the membrane and the member being
intended to close the water passage when resting on the
seat o~ the body, an electro-magnet as well as a spring
acting on a core to ensure the closing and the opening of
the passage, characterized in that the electro-magnet is
mounted in an output which comprises a backspace for the
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core, the core comprises a rod which extends it towards
the resting member, provided at its end with a tightening
member, so that when the valve is out of tension the
spring pushes the core into the backspace and liberates
the membrane and the resting member.
The valve is further characterized in that it com-
prises a guiding ring of the rod on which rests the return
spring.
The invention has further for its object the use of
the hereabove defined electrovalve in household electri-
cals in order to obturate the hydraulic duct of the ap-
paratus when one simultaneously opens another duct.
More precisely, the invention has for its object the
use of the electrovalve in an apparatus for producing hot
water in order to set the said tank at the atmospheric
pressure in the absence of water outflow and to reset said
tank at the feeding pressure during the outflow water.
In order to better understand the invention the at-
tached drawing shows ~
Figure 1 : a normally opened electrovalve according to
the invention in closed position.
Figure 2 : an example of use of the electrovalve ac-
cording to the invention in a hot water production device.
As illustrated in igure 1, the electrovalve comprises
a body 1 to which are connected the input 11 and output 12
ducts. The body comprises in its lower central portion a
seat 13 intended for the passage of water and to be ob-
turated by a membrane 2.
The electrovalve comprises an electro-magnet 14 in a
housing 15 the lower part of which which rests on the body
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1 has a void 16 having the general hemispherical shape.
The membrane is maintained clamped between the housing 15
and the body 1 and it is reinforced in :its central portion
by means of a resting member or insert 4. The membrane is
perforated at its periphery 3 so as to leave water circu-
late into the void 16 in order that water pressure will be
the same on both sides of the membrane. The membrane 2 and
~he member 4 are further crossed by an aperture intended
at the opening of the valve to start the flow between the
void 16 under pressure and the outlet duct 11.
The electro-ma~net comprises a magnetic circuit at the
center of which is located an envelop in which a core 22
is displaceable. When the magnetic circuit is under ten-
sion, the core is placed to be at the maximum o~ the mag-
netical field. A spring 20 is mounted on the core so that
when the magnetic circuit is out of tension, the core dis-
places and moves away from said circuit.
According to the invention, the spring 20 moves the
core 22 away from the membrane. The envelop co~prises to
this effect a backspace 21. Further, according to the in-
vention, the core is extended towards the member 4 by
means of a rod 17 the end of which carries a tigheting
member 18 which is supple and intended to close the member
4.
In the example shown, this spring 20 pushes away the
core; to this effect it comes to rest on a ring 19 which
is also a guiding ring.
This example is not limitative and one can provide any
equiva1ent means particularly a return spring in the back-
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space 21, etc.
The working of the electrovalve is the following :
1. in the absence of current, under the effect of
the spring 20 the core 22 is displaced back in the space
21. Due to the presence of the peripherical perforations 3
the pressure is equilibrated on both sidles of the membrane
on an identical surface. The pressure of the water do not
exerce any effort on the membrane which is in a so-called
normally spread out position from the seat, leaving there-
fore a free passage for the water.
2. in presence of current, under the action of
the magnetical field created by the magnetic circuit 14,
the core 22 displaces itself, compressing the spring 20
and pushing the membrane 2 provided with its member 4 onto
the seat of the body 1. `
Then, the pressure which is exercated on the side of
the core on the whole surface of the membrane and on the
other side on the annular surface which is less, applies
strongly, due to the fact of this difference of surfaces,
the membrane 2 onto the seat of the body 1, ensuring the
tighteness between the entry 10 and the outlet 11.
3. When again the magnetic circuit is set out of ;!
tenslon, the core is driven by the spring 20 and pushed
into the backspace 21. The joint 18 displaces away of the
member 4, liberates its central aperture and water flows,
the pressure decreasing on the side of the core, the mem-
brane is only submitted to its own elasticity and it comes ~
back to its normal posiiton, liberating the seat 13 of the ~-
body.
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Furthermore according to the invent:ion, one intends to
feed the magnetic circuit with rectified current by means
of the adjonction of the diode bridge or the equivalent
(not shown~ at the ends of the circuit in order to reduce
at least considerably the vibrations due to the alterna-
tive current.
In fact according to the invention the valve is closed
in working state; the obturation of the central aperture
of the membrane and of its insert is made under the action
of the magnetic circuit when excited through an alterna-
tive current; the alternances of this current causing
necessarily vibrations of the core which may affect the
good tighteness of the joint 18 onto the insert 4.
The electrovalve according to the invention is used in
household electrical equipments which necessitate the
closure of a duct simultaneously to the opening of another
duct.
By way of example of utilisation one has realized the
device for the production of hot water shown at figure 2.
A tank 30 which is closed is fed with cold water 31,
and heated by a resistor 32. The tank comprises a duct 33
which is provided with the electrovalve 34 according to
the invention. The duct is opened to the free air. When
the tap 35 is closed, the installation is at rest, the
electrovalve is not under function; it is opened, the tank
being at the atmospheric pressure.
The function of the electrovalve is not to enable less
liquid to flow but to set this liquid at the atmospheric
pressure and to leave this liquid change its volume under
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the variations of temperature. .
When hot water is taken out from the installation it
is at a working state, the electrovalve is under tension
and is immediately closed; the tank is set at the feeding
pressure and the water can normally flow out in the du~t.
So the electrovalve according to the invention enables
to realize hot water production devices which can contain
hot water at the atmospheric pressure, and deliver it
under a normal feeding pressure similar to the production ;.
devices under pressure and this at reduced costs due to
the absence of the high pressures. ~. .
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