DE3106085A1 - LIGHTER SLIDER - Google Patents

Description

ι, 310G0G5

Note: Mastec Engineering Limited Newbold Street London (Ontario)
Canada

Title: Fire Train Slider

Representative: patent attorneys

Dipl. Ing. S. Schulze Horn M. Sc. Dr. H. Hoffmeister Goldstrasse 36 4400 Münster

Fire pull valve

The invention relates to a fire flue slide mechanism for opening and closing the cross section of an exhaust gas fire flue in the case of a heating device, such as a gas or oil-fired furnace.

For industrial ovens and household ovens or the like, various automatic ones are arranged in the flue gas duct Fire draft flaps and slides known which then close the flue pipe if there is no combustion in the furnace and if there is one in the furnace Combustion should open. The open position is normally controlled by a slide spring. at In the event of a power failure, the slide automatically moves from the closed to the open position; otherwise can the slide in the closed position by a direct current solenoid operatively associated with a temperature measuring device being controlled.

In such a device, the slide is due to the action of the solenoid quickly brought from its open to its closed position, what from at least two Reasons is not desirable:

1. There is additional noise when the slide reaches its end position when moving from the closing device reached the open position or vice versa.

2. An increased mechanical effort is required, to absorb the inertia of the fast moving slide.

Another automatic fire pull valve uses an electric motor to turn the valve in the smoke pipe between its open and closed position, either with or without a preloading device Operation of the valve flap. Such a device is described in U.S. Patent 4,039,123. This device however, suffers from several disadvantages including: with the defect that the motor-operated valve flap (vent) must be connected to a temperature measuring device, for example one arranged in the exhaust duct (smoke pipe) Thermocouple. This thermal sensor is used in the previous device to switch the associated on and off Electric motor. The slide therefore speaks directly to the request of the thermocouple for a Or shutdown period. Due to the operational requirements of this previous device, it closes the slide when the the temperature in the one to be heated

to

The room-measuring thermocouple only drops out after the sensor located in the furnace's smoke tube has reached a cooling threshold temperature which is fixed at around 170 ° C in most cases.

Especially in the case of an oil-fired oven which is not precisely tuned and which normally does incomplete combustion takes place, soot and coal particles are generated during operation of the furnace, which enter the Smoke pipe are taken and which are normally deposited on this because they also contain residual oil particles. As a result, in the device according to said US-PS, the thermal sensor is provided with heat-insulating carbon particles covered. This coating increases the sensitivity of the sensor are affected, so that the threshold temperature is much higher Value than the minimum value of 170 ° C shifts and thus the sensor is not working reliably.

Therefore, in some cases, there is oil as a fuel a tendency to close the valve prematurely while still hot smoke from the fire box or combustion chamber escape because there is still oil in it. In this case, the carbon monoxide concentration increases in a dangerous way.

Since in such devices the slide is closed only after a comparatively long period of time, the heat cannot be sufficiently retained in the furnace or, more precisely, in the boiler of the furnace because they are too long between switching off the stove and closing the smoke pipe can escape in a manner yet to be described.

Although in the device according to the said US-PS the sensor arranged in the smoke pipe in a certain sense could also be designed as a time delay mechanism, such a solution is unsatisfactory because the temperature sensor introduces an apparent time delay, the length of which is variable and indeterminable. This is unacceptable for two actually contradicting reasons:

1. The valve flap or the smoke pipe can move too quickly are closed, whereupon dangerous exhaust gases are trapped in the furnace combustion chamber.

2. The smoke pipe cannot be closed quickly enough, which is the case in the period between shutdowns of the furnace and closing the valve flap, a large amount of heat escapes through the smoke pipe.

The last mentioned, inadequate heat retention after

turning off the stove is of particular importance, because it can even have the consequence that this previous device is unusable for the intended purpose. This deficiency is in the case of a large cross-sectional area of the exhaust duct or smoke pipe as well as in a greater height of the chimney or the like. Even clearer, because in this case, as is obvious to a person skilled in the art is, due to the greater draft with a larger cross-section and greater height of the smoke pipe, this is of a larger one Air or gas volume is flowed through.

Devices of the type described in the referenced U.S. Patent are available in Canada by the Canadian Association of standards has been banned for the reasons outlined above.

The invention is therefore based in particular on the object of eliminating the disadvantages of the prior art by a to avoid time-dependent or time-out delay systems caused by temperature and other factors cannot be influenced, so that the ignition point and ignition switch-off point for the heating period are precisely adhered to can. A synchronous motor should also be provided, which slowly moves the flap or slide moved from the open to the closed position.

This task is performed with a fire pull valve for a heating system with a furnace for generating heat, from which Combustion products can be discharged to a fire flue or smoke pipe and the furnace control circuit for Turning off and turning on the furnace has according to the invention achieved in that a slide assembly with a Rotary flap arranged in the smoke pipe, which can be rotated between an open and a closed position, as well as a Actuating device connected to the rotary flap for rotating the rotary flap between the open and closed position are provided, and that the actuating device is connected to a shaft and the rotary valve Synchronous motor for swiveling or rotating the rotary flap, in a time-dependent delay device with a first switch device for establishing an electrical connection to the synchronous motor to this to Turning the rotary flap to apply voltage, a second that can be connected in series with the oven control circuit Switch device for establishing an electrical connection and for energizing the furnace control circuit in the Closing state of the second switch device to start the furnace, a means carried by the shaft for Closing the second switch device when the shaft is in a predetermined relative position, and a relay unit provided with two pairs of contacts

310-6

has, which is able to respond to a thermostat and is connected in series with this, so that when Close the thermostat when a set minimum room temperature is reached, the relay unit to Opening one contact pair and closing the other contact pair can be excited, of which the first contact pair is connected in series with the synchronous motor, so that the latter is de-energized, whereupon the Rotary flap rotated into the open position and when it is reached the fully open position the means closes the second switch device so that the oven control circuit closed and the furnace is started, and the second pair of contacts with the second switch external direction and the oven control circuit is in series.

The invention also relates to a method for heat preservation in a system with a heat-generating Furnace with gas or oil-fired burner, from which combustion products are sent to a fire flue resp. Smoke pipe are passed, the furnace having a control circuit for switching off, which is characterized is that in the smoke pipe close to the stove a fire pull slide device with a rotary flap for Opening and shutting off the cross section of the fire flue or smoke pipe and with a means for pre-loading

the rotary flap is arranged in the open position that the pusher device after a predetermined period of time in which the furnace is not fuel for heat generation consumed, is operated against the bias to close the smoke pipe in the closed position that the ambient temperature of a room to be heated is measured and a maximum and minimum room temperature be determined that the slide device for an opening under the preload is released when the minimum room temperature is measured that then the Fuel in the furnace is ignited so that the furnace generates heat which is conducted to the room to be heated, that when the maximum room temperature is reached, the fuel supply is interrupted to the furnace and that after the ignition of the fuel waited for a predetermined period of time and then the operation of the slide device to close the smoke pipe is repeated.

The following are preferred embodiments of the invention explained in detail in conjunction with the accompanying drawings. Show it:

1 shows a perspective illustration of the mechanical structure of a device with features according to the invention,

lit

2 and 3 partial side views of the device according to Fig. 1,

Fig. 4 is a schematic representation of the installation position of the Slide in operation,

Fig. 5 is a plan view of a fully closed slide, as it is preferred for oil heating and in the Fig. 2 and 3 is shown in side view,

6 shows an electrical circuit diagram for the device according to the invention and

FIG. 7 shows a representation, similar to FIG. 5, of another embodiment of a fire draft slide which however, has a reduced cross-sectional area flap which is preferred for oil heaters Permanent ventilation guaranteed in the closed position.

The figures show a heating system with a gas- or oil-heated or other fuel-fed furnace 30 for heat generation, the combustion by-products or exhaust gases of which are passed to a smoke pipe or fire flue 32 will. The furnace is equipped with a not shown, the

A person skilled in the art is provided with a control circuit which is known per se and which switches the furnace (burner) on and off. invention Accordingly, a slide 1 with a rotary flap 15, 15 'is arranged in the smoke pipe 2, which between Closed position (solid line) and an open position (dash-dotted line) is rotatable. With the Rotary flap 15 is connected to an operating mechanism, to turn it between open and closed position. The operating mechanism comprises a synchronous motor 6, which is connected to the rotary flap 15 via a shaft 7 and a “time-dependent delay device 9 with a first switch 9 ″ for establishing an electrical connection to the motor 6 in order to rotate it to put the rotary flap 15 on voltage. A second switch 11 for establishing an electrical connection can be connected in series with the furnace control circuit, and it is capable of the control circuit in the closed state to keep the furnace operating. A means carried by the shaft 7 in the form of an attachment of a lever 4 is used to close the second switch device when the shaft 7, and thus the lever 4 is in a predetermined position. A relay 18 with two pairs of contacts speaks to a thermal sensor 43 and can be connected in series with this, so that when the thermal sensor is closed when

a

Reaching a minimum ambient temperature selected for the heated room the relay 18 to open the one Contact pair and closing of the other contact pair is excited. The first pair of contacts is with the synchronous motor 6 connected in series, so that the motor 6 is switched off, whereupon the rotary flap 15 is below the force of a preload spring 14 in the open position turns. When the open position is reached, the approach 4 of the shaft 7 closes the switch 11, which is more preferred Embodiment is a microswitch. The control circuit is then closed, so that the furnace 30 is switched on the second pair of contacts of the relay with the second switch 11 of the oven control circuit in series is switched.

If the temperature sensor reaches the set maximum ambient or Detects room temperature, it opens under switching of the relay, which then switches the two pairs of contacts so that in one circuit the instantaneous Oven control circuit with switching off the oven (burner) is opened, while the time-dependent delay device 9 is applied to the other circuit is, so that the coil 9 'can close the switch 9 "after a predetermined delay time to the Synchronous motor 6 for closing the rotary flap 15 against

. "- 31DB085

to start clockwise.

According to Figures 1 and 4 is a slide assembly 1 in the fire flue or smoke pipe on the downstream side of a Furnace or the like heating device 30 connected to this or this. The slide assembly 1 is included especially in the smoke pipe 32 of a barometric flap or a slide 33 between furnace 30 and slide assembly 1 downstream.

According to Figures 1 to 5, the slide assembly comprises a tubular outer sheet metal housing 2, preferably made of aluminum-coated sheet steel, which is corrosion-proof and resistant to temperatures of up to 650 C, as well as a shaft 7 diametrically penetrating the housing, which shaft 7 is mounted on the outer sides of the walls of the housing 2 Storage 16 is stored. A circular sheet metal disc 15 is attached as a rotary flap on the shaft 7 and when the shaft 7 rotates between an open and a The closed position can be rotated in order to change the effective cross-sectional area of the tubular housing 2. The one End of the rotary valve shaft 7 extends to a coupling 8, which in turn in a conventional manner the synchronous motor 6 is connected, which in turn with the help of screw bolts 6 'with the interposition of

Spacers 6 "is mounted in an enclosing housing 20. The lever arm 4 is attached to the coupling 8, as a lever for mechanically pivoting the rotary flap 15 from the open to the closed position and vice versa. In Fig. 1, the rotary flap is in dash-dotted lines in a partially open Position shown, the dashed line position of the lever 4 of this partially open position corresponds to the rotary flap. A return coil spring 14 placed around the lever 4 causes a preload of the shaft 7 against the direction of drive of the synchronous motor 6, which opens the rotary flap fully when it is in operation. The spring 14 is capable of the rotary flap in to reset the closed position according to FIG. 5 and to hold it in this position when the engine is switched off is.

The electronic control circuit shown in Fig. 6 contains a terminal block 35 for the connection of the various, the time delay mechanism 9 associated lines and circuits and a relay 18 with two Contact pairs and other switches. A pair of cables is connected to a 24 V transformer, which is the feeds the entire system with electricity. A pair of lines 42 is connected to a room thermostat switch 43, which is in the

310608

Closing state requests a supply of heat, so that a heating cycle is initiated. In fact, it excites Thermostat switch 43 the relay 18, which then closes the first pair of contacts and the 'second pair of contacts opens. A pair of lines 41 is connected to the heating device 30 and either directly, for example with a switching valve for actuating the gas valve or faucet of a gas-heated oven or in the case of a Oil burner of an oil-heated furnace with the electric motor connected to the oil burner. This line pair 41 is thus connected to the on / off control circuit of the Furnace connected. This circuit can be accessed when the upper endpoint control of the boiler or furnace completed and this line pair is connected in series with this control, so that the The boiler or furnace is switched on with the microswitch 11 closed will. The line pair 41 of the terminals of the clamping block 35 is in series with the microswitch 11 and to the (normally open) second pair of contacts of relay 18. When relay 18 is energized, is this second pair of contacts closed.

When the motor 6 is connected to voltage, for example, the rotary flap 15 is in the closed position according to FIG. 5 to hold, there is the time delay relay 9

in the closed state. When the room thermostat switch 43 closes and thus calls for a supply of heat, this is Control relay 18 energized / so that the contacts of both contact pairs are drawn from the solid lines Move the position into the position shown in dashed lines (cf. FIG. 6). The contact of the time delay relay 9 moves from the closed position (dashed line) to the open position (solid line), so that 'the Motor 6 is switched off. When the engine is switched off, the return coil spring 14 moves the rotary flap 15 into the Open position (dash-dotted line according to FIG. 1), and when the fully open position is reached (see. Fig. 3), the approach of the lever 4 on the shaft 7 meets one Actuating arm 49 of the microswitch 11 to close this and thereby the oven control circuit via the second pair of contacts of relay 18 to close. The furnace is ignited so that the heating-up period begins.

When the set temperature value is reached, it opens the thermostat switch 43 with deactivation of the relay coil 18, so that its contact pairs in the in Fig. 6 Skip the position shown in the solid line. The furnace is shut down because the second pair of contacts of relay 18 has been opened. The time-

delay coil 9. ' gets excited, but activates it their switch only after the predetermined time delay period of the time delay switch of typically has elapsed two minutes. After the time delay period has elapsed, switch § "closes, causing the synchronous motor 6 for returning the rotary flap 15 (15 *) to the Closed position is activated. A mechanical second delay mechanism is preferred, preferably temperature compensated, used. For this purpose the mechanical time delay mechanism is suitable e.g. B. from Paragon Electric Company (Model No. 903) which operates with a time delay of two minutes.

If for maintenance or other reasons the described electrical function of the rotary flap is overridden and these are set in the open position should, the lever 4 can be moved by hand from the position drawn in drawn out into the position drawn in dash-dotted lines Moved position according to FIG. 1 and a locking pin 50 are advanced over the lever 4, so that he holds it in its vertical position. This mechanical override enables maintenance of the Slide assembly 1 and the furnace, the lever 4 at the same time because its longitudinal axis is in the same plane is like the rotary flap 15, a visual indicator for the

actual position of the rotary flap 15 in the slide assembly 1 represents.

In order to keep the actuating components as "cool" as possible and to switch off heat transfer from the flue pipe 2 to the housing and its cover 2O ¹ , these components are mounted on a cantilevered bracket 25, which, if desired, can be made of a material other than metal in order to provide a Eliminate heat dissipation from the tubular housing from the housing 20 and the components arranged in it as far as possible. The mounting of the bracket 25 on the smoke pipe is carried out according to FIG. 1 simply by means of self-tapping screws.

The modified embodiment shown in FIG. 6 has a rotary flap 15 ', the edges of which are parallel to one another are cut away, so that the rotary flap 15 'in the closed position of FIG. 6 only about 90% of the Total cross-sectional area of the tubular housing 2 closes. As a result, they also remain in the full closed position of the rotary flap 15 'on two diametrically opposite edge points passages 19 for the flue gas. This characteristic is particular then advantageous if the slide assembly 1 for a

Gas-heated furnace with pilot or pre-igniter flame used so that the outflow of combustion products in the furnace when the furnace is switched off generated by the pre-ignition flame is not hindered.

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Claims (8)

ο I U b U ο ο Patent claims: 1./ Fire train slide device for a heating system with \ J ■ a furnace for generating heat, from which combustion products can be discharged to a flue or smoke pipe and the one oven control circuit to turn off and switching on the furnace, characterized in that a slide arrangement (1) with a rotary flap (15, 15 ') arranged in the smoke pipe (2), which can be rotated between an open and a closed position, as well as one with the rotary flap (15, 15 ') connected actuating device for rotating the rotary flap between the open and closed position is provided are, and that the actuating device is connected to a shaft (7) and the rotary flap (15, 15 ') Synchronous motor (6) for swiveling or rotating the rotary flap in a time-dependent delay device (9) with a first switch device for establishing an electrical connection to the synchronous motor (6) in order to apply voltage to this to rotate the rotary flap, one with the furnace control circuit in series switchable second switch device (11) for establishing an electrical connection and for energizing the furnace control circuit in the Closing state of the second switch device to the To start the furnace, a means (4) carried by the shaft (7) for closing the second switch device, when the shaft (7) is in a predetermined relative position, and one with two pairs of contacts provided relay unit, which is able to respond to a thermostat (43.) and with this in series is switched so that when the thermostat (43) is closed when a set minimum room temperature is reached the relay unit can be excited to open one pair of contacts and close the other pair of contacts of which the first pair of contacts is connected in series with the synchronous motor (6) so that the latter is de-energized, whereupon the rotary flap (15, 15 ') rotates into the open position and when reaching the fully open position the means (4) closes the second switch device, so that the Oven control circuit is closed and the oven is started, and the second pair of contacts with the second switch device (11) and the furnace control circuit is in series. 2. Apparatus according to claim 1, characterized in that a preloading device (14) is provided, which the rotary flap (15, 15 ') when switched off Synchronous motor (6) holds in the open position. 3. Apparatus according to claim 2, characterized in that the means (4) is an elongate element which attached to the shaft (.7) and rotatable by this about an axis perpendicular to its longitudinal axis is, wherein the one end of the element (4) to act on the second switch device and to close able. 4. Apparatus according to claim 1 ,. characterized, that the second switch device is a microswitch (11). 5. Apparatus according to claim 2, 3 or 4, characterized in that the thermostat (43) when reaching the maximum ambient or room temperature opens and thereby the relay (18) to open its second pair of contacts drops so that the furnace control circuit (20) is opened while its first pair of contacts closes and thus activates the time-dependent delay device, which after its default time has elapsed closes and the synchronous motor (6) for turning the rotary flap (15, 15 ') into the closed position Tension sets. 6. Apparatus according to claim 2, 3 or 4, characterized in that the thermostat (43) when reaching the
maximum ambient or room temperature opens and
while the relay (18) to open its second pair of contacts drops out, so that the oven control circuit (20) is opened while its first pair of contacts closes and thus activates the time-dependent delay device, which closes after its specified time and the synchronous motor (6) to turn the rotary flap (15, 15 ") into the closed position
Voltage puts on and that the time-dependent delay device the synchronous motor (6) only two minutes
after activation by the relay unit applies voltage. 7. Apparatus according to claim 2, 3 or 4, characterized in that the thermostat (43) when reaching the
maximum ambient or room temperature opens and
while the relay (18) drops out to open its second pair of contacts, so that the oven control circuit (20) is opened while its first pair of contacts closes and thus activates the time-dependent delay device, which closes after its specified time and the synchronous motor (6) to turn the rotary flap (15, 15 ') into the closed position 3 Ί 0 6 08 Voltage applies and that the time-dependent delay device is a mechanical time delay mechanism is. 8. Process for heat conservation in a system with a heat-generating furnace with gas or oil heating Burner from which combustion products are directed to a fire flue or smoke pipe, the furnace has a control circuit for switching off, characterized in that in the smoke pipe close to the furnace a fire flue slide device with a rotary flap to open and shut off the cross section of the fire flue or smoke pipe and arranged with a means for preloading the rotary flap in the open position is that the sliding device after a predetermined period of time in which the furnace is no fuel consumed to generate heat, against the preload to close the smoke pipe in the closed position is operated that the ambient temperature of a room to be heated is measured and a maximum as well as A minimum room temperature must be set for the slide device to open under the Preload is released when the minimum room temperature is measured that then the fuel ignited in the furnace so that the furnace generates heat, which is directed to the room to be heated that the fuel supply when the maximum room temperature is reached to the furnace is interrupted and that after the ignition of the fuel a predetermined period of time waited and then the actuation of the slide device to close the smoke pipe is repeated.