DE2009970A1 - Hot water generator for central heating and boilers and stoves - Google Patents

Description

PATENT LAWYERS

DIPL-ING. CURT WALLACH 20099? Q

DIPL.-ING. GÜNTHER KOCH
DR. TINO HAIBACH

8 MUNICH 2,

OUR MARK: 12537

Societe anonyme dite:

FONDERIES FRANCO-BELGES
59 Merville, France

Hot water generator for central heating and boilers and stoves

The invention relates to a central heating system using fuel oil and, if necessary, to generate hot water,

The invention is directed to a central heating boiler equipped with a fuel oil evaporation burner with natural or assisted draft of the type having an electric ignition device, further with a tank of constant level which ensures a desired amount of fuel oil to the inlet of the burner, a thermal one relay, which regulates the fuel quantity and, optionally, which differs with an air supply fan, which heating boilers of the known types, that a Hagnetventil is provided, which regulates the promotion of the fuel oil between said container of a constant level and the burner further .009839 / 1419

an electrical torque relay, which controls the automatic ignition as well as the control of the ignition and operational fuses ensures which relay is provided with a self-excitation circuit to excite the solenoid valve to maintain, and which torque relay also has a normally open contact that switches off the current flowing through the thermal relay when the burner is switched off, in order to avoid cooling sluggishness to counteract the bimetallic strip and to ensure a minimum funding during ignition, and if necessary a second working contact, which is used to operate a fan when the burner is switched off to turn off.

When these different elements are used, automatic ignition and renewed automatic ignition are activated of the burner can be achieved without manual operation after the desired amount of heating oil has been reached with one hand movement has been regulated, which ignition can only take place when the burner is cold, with a heat probe this Ignition prevented in the opposite case as a safety measure.

In addition, the burner can only be ignited if the ignition transformer is in good working order, which for this purpose with a device is provided that its feeding in the event of excessive heating of its housing prevents

It should be noted that during the ignition period the fuel oil delivery rate always has its lowest value in order to avoid flooding the burner Heat probe switched " ^ind * 009839/1419

The re-ignition therefore takes place automatically after cooling down of the burner and, if applicable, the ignition transformer, regardless of the manner in which it is extinguished by external control organs, for example by a clockwork, a room thermostat, a water temperature safety controller (aquastat de securite) or by a boiler temperature safety controller is.

The presence of the safety device called the thermal probe causes a minimum duration of about 20 minutes between extinguishing and subsequent re-ignition, which is the duration of a sufficient one Cooling down of the burner.

In the case of heating boilers of higher capacity, an air supply fan is used provided to support the natural pull, as well as the necessary apparatus for actuation and automatic control of the operation of the fan depending on the fuel oil flow rate.

Independent of the aforementioned automatic ignition, the heating boiler is also with a certain number of Devices, some of which, such as the water temperature safety regulator, ensure the shutdown of the burner if there is an abnormal increase in temperature of the radiator takes place.

The use of other devices for the heating boiler, however, is new, in particular the use of a room thermostat with two opening contacts, each at the desired room temperature and at a room temperature come into action by a certain number of degrees Celsius, z * B. 1 ° C higher than the desired temperature.

The first of these contacts reduces the burner,

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during the second the complete shutdown of the burner brings about.

Using such a room thermostat enables the same temperature control advantages to be achieved as the use of a burner that works either at full load or throttled (all or little), however eliminating any risk of overheating when throttled Operation through the additional use of an organ for complete shutdown of the burner (all or nothing) as soon as the room temperature reached exceeds the aforementioned desired number of degrees Celsius.

There is also a control panel on the boiler with a Number of luminous signs provided, which at each moment the operation and working of the burner and allowed to monitor his control device.

The information given by the illuminated signs mentioned is triggered either by the room thermostat mentioned or by the water temperature safety regulator, which is provided in the event of overheating. The relays located on the control panel are operated by the timer, if one is provided, and controlled by the various safety devices. The relay transferred to the burner block the information of the mentioned room thermostat and, if the water temperature regulator the water heater to a proper regulation to achieve the heating behavior.

In addition, in the case of heating systems that guarantee boiler hot water generation, the temperature control of the central heating is combined with a hot water temperature control that is located in the boiler or in the block coupled with the boiler for this purpose (a small boiler accelerator is also in this case in the boiler

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Heating system provided).

An additional moment relay of the same type as that The aforementioned torque relay then enables an automatic transition from an operation in which the control of the burner solely dependent on the room thermostat happens to an operation that can be described as operation with "hot water priority" and enables keep the burner energized to continue heating the hot water as long as this is the desired temperature has not yet reached.

In this case the "throttle" contact of the room thermostat no longer has any effect on the control. The "switch-off" contact alone interrupts the central heating by switching off the accelerator, while the burner then works in a throttled state for _{the sole purpose of (} the purpose of heating the hot water boiler (an anti-thermosyphon valve is provided in the central heating system to prevent any undesired circulation).

The control panel is included for the production of hot water two additional luminous symbols that show whether the hot water has reached the desired temperature or whether this hot water is still exposed to the effects of the burner.

The aforementioned torque relay also has the option of a To operate the boiler accelerator.

This second moment relay is operated by a boiler with water temperature control conventional type depending on the temperature for the hot water in the boiler is selected, controlled "

It is possible to use heating boilers of the type described above

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produce, in which the fully automatic control described is replaced by a semi-automatic control is.

For example, a device can be provided in which the so-called semi-automatic control in In summer it is based only on the hot water temperature and in winter on a principle of hot water priority, which is determined by is somewhat different from the aforementioned device.

Such a system can then have a key switch that enables the desired type of automatic To choose the regulation by hand at will, namely:

1. All or nothing operation to control the burner and use in average weather;

2. an all or little operation also applicable for control of the burner and for use in cold weather;

3. An operation all or nothing with the water temperature safety regulator when using the system for the kitchen

4. Or eventually an all or nothing operation for the summer and controlled by the hot water boiler depending on the temperature of the one in it Hot water.

If the keys corresponding to one of the first two possibilities and the key, are pressed at the same time which corresponds to the fourth possibility, an operation with "hot water priority" can be achieved that of the preceding one described is comparable.

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The wiring of the heating boiler according to the invention
preferably has a connection by multiple plug connections between the outer elements and the control panel 'and a connection of the same type between the
Control panel and the burner so that either the control panel or the burner block can be separated, which can be easily and completely removed without special tools
can.

The features of the invention will be better understood on the basis of the following description of an embodiment of the E generator system with an evaporation burner with which a central heating boiler is equipped, which ensures the production of hot water through the external boiler,
which embodiment is given only as an example and is explained in more detail in connection with the accompanying drawings, namely show:

Fig. 1 is a schematic representation showing the supply of the electrical control device of the automatic Shows generating plant by an alternating current network;

Fig. 2 is a view showing the container with constant Level shows the burner, the solenoid valve and is associated with the detonator;

3 is a perspective view of the control panel of FIG
Generating plant.

From Fig. 1 it can be seen that the power supply is connected to two terminals 1.

The timer 2 located on the control panel controls
As will be explained in more detail below, the opening and closing of a switch 3, the closing of which supplies the

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different organs of regulation allows.

However, there is also a switch U that can be operated manually on the control panel in parallel connection to switch 3, so that the generator with or without timer 2 can be operated. The producer has a water temperature safety regulator 5, which lights up a safety lamp in the event of overheating of the heating water 6 caused by closing its contact 5a and at the same time switching off the common Feed circuit 7 for the other control parts by opening its contact 5b.

As already mentioned, the control has a torque relay 8, which is fed in the idle state by a safety device 10 is ensured, which regulates the heating of the ignition transformer of the burner and a contact a changeover switch 12 controlled by a probe exposed to radiation from the burner which Contact does not close until the burner is cold.

As soon as the relay 8 is energized, it closes a normally open contact 13 before the contact 9 is opened, whereby each Shutdown of the supply of the relay 8 is avoided.

The relay 8 then remains via the normally open contact 13 in series connection with the contact 5b of the water temperature safety regulator 5 and with a switch IU, which is operated by the control handle for the heating oil flow rate, self excited.

This switch also controls the supply of the primary winding 15 of the ignition transformer, its secondary winding 16 and is connected to the spark plug 46, which is only fed when the temperature of the ignition transformer

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is not too high.

Under these conditions, the ignition transformer can only be fed when the burner is cold and if the internal temperature of the transformer does not exceed a certain value. An indicator light 17 in Parallel connection to the entire primary winding 15 of the ignition transformer and to the safety device 10 indicates that there is an ignition control and that if it remains lit for a certain time, the ignition does not happen correctly, either because of a mechanical failure or because of the safety of the transformer.

When the burner is sufficiently warm, the contact 11 opens at the same time as a second one closes Contact 18, which is in. Series connection in the supply circuit of a thermal relay 19.

The supply of the torque relay 8 during commissioning is only possible when the contacts 10 and 11 are closed, which does not allow the energization of the switch when the burner is warm or when the ignition transformer 15 has an excessive temperature.

The torque relay 8, however, remains on the normally open contact 13 itself excites regardless of the position of the safety contacts 10 and 11.

With its normally open contact 20, the torque relay enables 8 the supply of the thermal relay 19, so that it is only energized when the burner is warm (changeover switch 12).

The room thermostat is of the type with two opening contacts in series · Depending on the temperature increase in the heated room, the contacts open as follows:

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- ίο -

- the opening of the first contact 21, the "throttle" contact is referred to, allows the cooling of the thermal relay 19 by the series connection with a neon sign and causes the bimetallic strip 25 to fall off and the container 45 to switch from constant Level to the minimum funding.

- The opening of the second contact, known as the "shutdown" contact can be designated, the series connection with a second neon light makes it possible to switch off either the accelerator alone when the hot water is in the heating season, or it is switched off the accelerator and the burner itself if the water is warm or the system does not have a hot water boiler owns.

The bimetal strip 25 heated by the passage of current in the thermal relay 19 can close a contact 26 in Series connection in the feed circuit of an air supply fan 27 via at least one of two resistors 28 and 29, which are connected in series with each other and as a choke resistance 28 + 29 and minimum operating resistance (29 alone) are designated.

A changeover switch 30, which is firmly connected to the axis of the handle to regulate the amount of heating oil Actuating the cam actually enables the fan 27 to be fed with its maximum output through the resistor 29 alone, the contact 30a of the switch 30 and the contact 26, if the selected fuel oil delivery rate is proportionate is high and the burner is warm.

On ignition enabled when powered and self-excited holding moment relay 8 a normally open contact 31 the maintenance a throttled supply for the fan 27 via the mentioned resistors 28 and 29 independently of

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- li -

the fuel oil delivery volume, which is set by the operating handgrxff, since the resistor-28 is only short-circuited is when the contact 26 is kept closed by the bimetal strip 25, which during the ignition period (Opening of contact 18) is not heated.

As soon as the burner is warm, the closing of the contact 18 and the contact 20 of the moment relay 8 is the Thermal relay 19 fed, the bimetallic strip 25 closes the contact 26 after a fairly short time.

From this moment on, the fan 27 can move with it the speed selected by the switch 30.

If the hex oil flow rate set with the manual control element is not high, the fan will operate via contacts 26 and 30b, so that in this case the fan rotates at a reduced speed.

If, on the other hand, the hex-oil delivery rate is high, the fan 27 is fed via contacts 26 and 30a, so that in this case the fan rotates with the maximum speed, because the resistor 28 through the contact 30a is switched into the shunt.

From this it follows without further ado that the fan supplying the air necessary for the combustion is closed increasing Hexzöl volume must turn faster and faster. Without changing the principle outlined, the Resistors 28 and 29 advantageously replace by a variable resistor whose value decreases when the requested Hexzöl increases, creating a higher voltage at the terminals of the fan 27 and therefore a stronger air supply is made possible proportionally to each required fuel oil delivery rate.

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It follows from the foregoing that as long as the burner is cold (ignition), the changeover switch 12 of the heat probe 44 does not allow the bimetallic strip 25 to be heated by the thermal relay 19, so that the fuel oil flow rate their Has minimum value. Then when the heat probe, which is exposed to the radiation from the burner, actuates the changeover switch 12, and causes the thermal relay 19 to be energized, the fuel oil delivery rate selected by the operating handle 45b becomes progressively over a period of time during which the closure of the contact 26 allows the fan allows, with the selected by the switch 30 by the operating handle 45b for the fuel oil delivery rate to work. The systems equipped with a boiler for hot water production also have a second relay 32, whose excitation via a contact 33 of the boiler water temperature regulator is controlled.

When the desired temperature of the hot water in the boiler has been reached, contact 33 opens and the lighting of a lamp 34 in series with the relay 32 is enabled, which lamp is the Relay 32 turns off and indicates that the water is warm.

When relay 32 is energized, it closes a certain number of normally open contacts, namely:

a contact 35 referred to as the "hot water priority" contact and the throttle contact 21 short-circuits, so that the operation of the burner in the throttled state is no longer possible under the influence of the room thermostat, whereupon the supply of the thermal relay is only switched off can be when the shutdown contact of the room thermostat mentioned opens and the shutdown lamp lights up 24 as well as the shutdown of the accelerator 41 causes.

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The excitation of the relay 32, however, also causes a further normally open contact 36 to close, which maintains it a direct supply of the relay 8 and the primary winding 15 of the ignition transformer enables which elements were previously fed by means of a break contact 37 of the relay 32 via the AbschaItkontakt 22, the contacts 36 and 37 are provided so that this switchover takes place without interruption.

It follows that in the feed position of the relay 32, the action of the contact 22 of the thermostat on the burner is also switched off, the shutdown of the boiler no longer depends on the boiler water temperature controller, the central heating is switched off by contact 22, which interrupts the supply of the accelerator 41, so that, thanks to the anti-thermosiphon valve, every water circulation in the radiators is prevented.

The contact 22 also interrupts the supply of the thermal relay 19, so that the generator is throttled in this case works with the hot water boiler.

The excitation of the relay 32 also causes the closure of a third normally open contact 38, which acts on a boiler accelerator 39 acts, as well as the lighting up of a lamp 40, which indicates that the burner is still fed, so the hot water can reach the required temperature.

Solenoid valve 42 is connected in parallel to relay 8, which remains fed as long as the relay 8 is live.

In Fig. 2 the fan and its throttle resistor, the ignition transformer 15-18, the solenoid valve 42 and the adjustment handle 45b for the delivery rate, which controls the switch 14 actuated, shown.

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The constant level tank is shown at 45 with dashed lines. A thermal probe 44 that is exposed to the radiation of the burner, controls the solenoid valve 42 and the thermal relay 19 by means of the switch 12th

The fuel oil supply to the burner from the tank 45 at a constant level via the solenoid valve 42 is through the rings of the burner at 43 is covered.

On the control panel of FIG. 3, the timer 2 is visible, the effect of which is switched off by means of a switch 4 which is also visible on the control panel.

The measuring instrument 47, which is visible in Fig. 3, indicates the temperature of the water in the radiator of the boiler.

Finally, the front of the control panel also has six indicator lights 6, 17, 23, 24, 34 and 40.

'The lights 6 and 17 show how the burner works Information, the lights 23 and 24 are used to control the room temperature in the room to be heated and finally allow the lights 34 and 40 to determine whether the hot water is still being heated or whether it is already the has reached the desired temperature.

The invention is of course not limited to the embodiment described and illustrated, but can be used within experience various changes to its framework.

Patent claims;

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Claims (3)

-XS- Patent claims: l.j Hot water generator for central heating with boiler and stove, as well as with a heating oil evaporation burner, characterized in that it is independent of the elements, with which generators of the type mentioned are equipped, a solenoid valve is provided which the Pumping of heating oil between its tank of constant level and its burner regulates and which one depending on the action of a heat probe of known type is opened, the action of the radiation of the burner is exposed and controls the supply of the burner with heating oil, which heat probe also controls the actuation of the solenoid valve as long as the burner is warm, an electrical torque relay is also provided is, which ensures the automatic work and .the control of various ignition safety devices, which should enable the actuation of the solenoid valve to be maintained without interruption in order to to obtain a minimum fuel oil flow rate at ignition by interrupting the supply of a thermal relay, and to control the shutdown of a fan when the aforementioned system is shut down, for which control the new use for the named generator of a room thermostat with two opening contacts is provided, wherein the opening of the first contact is a throttled Allows operation of the burner and opening of the second Contact controls the complete shutdown of the central heating. 2. Generator according to claim 1, characterized by display 009839 / U19 light which at every moment monitors the operation of the burner in the one to be heated Room reached room temperature and the temperature of the hot water in the mentioned boiler enable. 3. Generator according to claim 1, characterized in that the control panel carries a switch which serves to to switch off the action of the timer, and furthermore has a measuring instrument which measures the temperature of the water that is in the radiator. Generator according to claim 1 with the production of hot water in a boiler, characterized in that a second A torque relay is provided which, without operating shutdown, combines operation with hot water priority and a regulation by a room thermostat with a double contact allows to be dependent from the position of this relay the lighting of two signal lamps for the temperature of the hot water and to control the supply of a boiler accelerator in parallel with the "heating" lamp. 009839/1419 Blank page e