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Патент USA US3071193

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Jan. 1, 1963
K. RAU
3,071,183
APPARATUS FOR SETTING SPACE HEATING SYSTEMS INTO OPERATION
Filed July 15, 1960
34
32- '
ice
3,071,183
Patented Jan. 1, 1963
2
3,071,183
APPARATUS FOR SETTING SPACE HEATEIG
SYSTEMS INTQ OPERATION
Kurt Ran, Tutzing, near Starnberg, Germany, assignor to
Wilhelm Baler KG, Stockdorf, near Munich, Germany
Filed July 13, 1960, Ser. No. 42,545
Claims priority, application Germany July 25, 1959
3 Claims. (Cl. 158-28)
normally interrupts this lead, and closes the same only
upon the maximum permissible temperature of the burner
being exceeded.
In an advantageous form of the invention the switch
coil of the relay for the ignition device is connected in
series with the device for the supervision of the condi
tions of burning.
The apparatus according to the invention may also be
used in the case of burners which operate with an elec
The invention relates to apparatus for setting space 10 tromagnetically-controlled valve arranged in the fuel feed
pipe of the burner, if the switch to be actuated by hand
brings in the electromagnetic valve together with the
used in motor vehicles, comprising a burner for liquid
fuels and an electrically-driven blower for the feed of
drive device of the combustion air blower.
In the accompanying drawing a practical example of the
combustion air to the burner. There are also usually
provided in such heating devices an electrical ignition 15 apparatus according to the invention is shown in conjunc
tion with a vehicle heating system, and from the following
device to ignite the fuel-air mixture, a device to supervise
the conditions of burning, and a switch by which the elec
description thereof further advantages and features of the
trical drive device of the combustion air blower and the
invention will be appreciated.
heating systems into operation, more especially systems,
As may be seen from the drawing, an electric drive
electrical ignition device are connectable to a source of
20 motor 2 located beside a heat transmitter 1 drives a blower
electric current.
In a known form of such apparatus use is made of a
3 for air which is to be heated, and an enclosed blower
press~button circuit for setting the device into operation,
and upon depression of a button, designated for example
“Pro-glow,” a glow plug is brought into service. There
4, supplying the combustion air and the liquid fuel, which
blower is connected by a pipe 5 to a burner 6 in which
is mounted an ignition plug 7. A combustion chamber
upon after illumination of an indicator lamp a second 25 8 is formed by the forward portion of a heating gas chan
nel 9. The air to be warmed enters through an inlet
button is actuated, whereby the electrical drive device of
aperture '10 into a heating air channel 11 which annularly
the combustion air blower (which in most cases simul
taneously drives a supply device for the fuel, and the heat
encloses the heating gas channel 9, and passes from an
outlet aperture 12 through a pipe (not shown) into the
ing medium), is brought into service.
This arrangement has the fundamental disadvantage 30 vehicle space to be heated.
that its actuation depends upon the undivided attention
Safety channels 13 and 14, which like other channels
not visible in the drawing are formed with several ways
of the person operating it, and moreover necessitates two
manual operations prior to the actual starting up, accom
running between the walls 15 and 16 parallel to the axis
panied by observation of an indicator device to ascertain
direction of the heat transmitter 1, are intended, in the
35 case of a leaking heating gas channel 9, to prevent pas
the condition of the glow plug.
A tendency has therefore already arisen to plan such
sage of the exhaust gases into the heating air channel 11,
a control apparatus to. include an automatic mechanism
in which ribs 17, 18 are provided for better heat trans
consisting of a time switch which, in the course of its
mission.
running, automatically cuts out the ignition device after
When setting the above-described heating device into
termination of the ignition period. However, apparatus
operation, contacts 21, 22 are closed by depression of a
of that kind suffers from the disadvantage that a mechani
hand-actuating element 19 of a switch 24}. The drive
cally-running clock must be provided, whereas in an auto
motor 2 is thereby connected to the positive terminal
23 of a source of electricity supply, such as a battery,
matic mechanism the aim is towards fully-electric control
and thus receives current. Likewise, by means of con;
of the entire arrangement.
The aim of the present invention is to provide a mecha 45 nections 24 and 25 and a device 26 for supervision of the
nism with which it is possible to set the heating system
conditions of burning (which device, when a thermostat
in operation by depression of a single button. The appa
27 is cold, closes contacts 28 and 29), a coil 30 of a relay
ratus according-to the invention is further intended to be
31 receives current, so that a relay switch 32 is closed,
and thus the ignition plug 7 also receives current through
equipped with as small a number as possible of switch
contacts, but nevertheless to operate fully automatically,
the connection 33. By closure of the relay switch 32,
including, in cases of failure, control of the heating system.
however, current is also passed through a connection 34
and a resistance 35 to a heating coil 36 of the switch 20.
According to the invention the switch, through which
the electrical drive device of the combustion air blower
It ignition occurs, then within a short time the thermo
stat 27 of the device 26 for supervision of combustion
and the electrical ignition device are connectable to a
source of current, is equipped with a device for manual 55 warms up, and the contact 28 is thrown to the contact 37,
hereupon a service lamp 38 lights, whilst the current to
actuation and with a heating coil, which, upon a prear
ranged heating-up temperature being reached, cuts out
the switch by means of a temperature-sensitive control
element, e. g. a bimetallic spring.
A relay adapted to switch the electrical ignition device
is preferably provided, in which case there branches off,
between the switch contact of the relay and the connec_
tion of the electrical ignition device, a lead which runs
to the heating coil of the switch which is adapted to be
actuated by hand.
In order to obtain on the one hand a su?iciently long
ignition period, and on the other hand the possibility of
rapid cut~out by the heating coil, a resistance conveniently
precedes the latter in circuit. A connecting lead of the
the relay coil 30 is interrupted, whereby the relay switch
32 opens. The ignition plug 7 and the heating coil 26 of
the switch 20 are thus cut out.
If on the other hand no ignition occurs, then the ther
most-at 27 remains cold and the contacts 28 and 29 re
main closed. In this case the heating coil ‘36 of the
switch 20 is excited and causes the heating up of a tem
perature-sensitive element 39, which is then displaced to
the dotted position 39’ and in doing so breaks the con
tacts 21 and 22, whereby the entire appliance is put out
of operation.
If on the other hand, with contact 21 and 22 of the
heating coil, for example connected in parallel with the 70 switch 29, and v28 and 29 of the device 26 closed, over
series resistance, may then be provided, in which is located
a device for supervision of the burner temperature, which
heating of the appliance occurs, then contacts 40, 41 of a
device 42 for supervision of the burner temperature are
3,071,183
closed. The heating coil 36 thereby receives current di
rectly through the connection 24 and the device 42, i.e.
without interposition, of the series resistance, and in a
very short time brings about the heating-up of the tem
perature-sensitive element 39 and thus, as previously de
scribed, the cutting-ou-t of the heating appliance.
4
said electric motor for driving the combustion air blower
and the electric ignition device are connectable to said
source of electric current, said switch being provided with
a temperature-sensitive control element and a heating
coil which, at a prearranged temperature, cuts out said
switch by way of said temperature-sensitive control ele
The invention is not limited to use with a heating
ment; a relay switch located in the circuit of the electric
device of the above-described kind, but may also be
ignition device and a ‘lead running to the heating coil of
used in the case of other heating devices, such for exam
the manually operable switch and being connected with
ple as operate with a fuel pump and a combustion air 10
the connecting lead‘ between said relay switch and the
blower separate therefrom. If for example the fuel is
electric ignition device; electrical circuit means for con
fed by gravity, a valve may be provided in the fuel pipe
necting said motor, said ignition device, and said heat
5 of the heating device and the valve may be controlled,
ing coil to said electric current source; and combustion
together with the motor 2, by a magnetic coil connected
control means comprising a switch normally closed, but
in parallel to said motor. Variations and additions to 15 opened during operation of the burner, said switch being
the circuit may be made without departing from the scope
connected in series with the switching .coil of said relay
of the invention, as de?ned in the appendant claims.
switch.
What is claimed as new and desired to be secured by
Letters Patent is:
3. Apparatus for setting space heating systems into
operation, more especially in motor vehicles, including a
1. Apparatus for setting space heating systems into 20 burner
for liquid fuels; an electric motor; a blower for
operation, more especially in motor vehicles, including a
the feed of combustion air to said burner, driven by said
burner for a mixture of liquid fuel and air; an electric
electric motor; an electrical ignition device for ignition
motor; a blower for the feed of combustion air to said
of the fuel-air mixture; a source of electric current; wir
burner, driven by said electric motor; an electrical ignition
ing providing a circuit for said ignition device and current
device for ignition of the fuel-air mixture; a source of 25
source; a switch adapted to be actuated by hand through
electric current; wiring providing a circuit for said igni
tion device and cur-rent source; a switch adapted to be
which said electric motor for driving the combustion air
blower and the electric ignition device are connecta-ble
actuated by hand through which said electric motor for
to said source of electric current, said switch being pro
driving the combustion air blower and the electric ignition
vided with a temperature-sensitive control element and
device are connectable to said source of electric current, 30
a heating coil which, at a prearranged temperature, cuts
said switch being provided with a temperature-sensitive
out said switch by way of said temperature-sensitive con
control element and a heating coil which, at a prear
trol element, said heating coil being electrically connected
ranged temperature, cuts out said switch by way of said
to said source of electric current; wiring providing a cir
temperature-sensitive control element, said heating coil
being electrically connected to said source of electric 35 cuit including said current source, switch, and motor, a
resistance between the electric ignition device and the
current; wiring providing a circuit including said current
source, switch, and motor, a resistance between the elec
tric ignition device and the heating coil of the manually
heating coil of the manually operable switch; a relay
switch located in the circuit of the electric ignition device
wherein said resistance is connected with one and the
operable switch; a relay switch located in the circuit of
the electric ignition device wherein said resistance is con 40 same end to said relay switch and to the electric ignition
device; combustion control means comprising a switch
nected with one and the same end to said relay switch
normally closed, but opened during operation of the
and to the electric ignition device; an overheat thermostat
burner, said switch being connected in series with the
comprising a switch normally open, which is closed at a
switching coil of said relay switch; an overheat thermostat
pre-arranged temperature, said switch, being connected
comprising a switch normally open, which is closed at a
in parallel with the circuit part formed by said resistance 45 pre-arranged
temperature, said switch being connected in
and said relay switch.
parallel with the circuit part formed by said resistance and
2. Apparatus for setting space heating systems into
said relay switch.
operation, more especially in motor vehicles, including
a burner for liquid fuels; an electric motor; a blower
for the feed of combustion air to said burner, driven by 50
said electric motor; an electrical ignition device for igni—
tion of the fuel-air mixture; a source of electric current;
a switch adapted to be actuated by hand through which
References (lited in the ?le of this patent
UNITED STATES PATENTS
2,388,855
2,484,008
Leslie _______________ .._ Nov. 13, 1945
Aubert ______________ _.. Oct. 11, 1949
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