WO2016096396A1

WO2016096396A1 - Auxiliary device for an oven and oven having such a device

Info

Publication number: WO2016096396A1
Application number: PCT/EP2015/078149
Authority: WO
Inventors: Wai Sing LEE
Original assignee: Hu, Bing
Priority date: 2014-12-16
Filing date: 2015-12-01
Publication date: 2016-06-23
Also published as: DE202014009877U1

Abstract

An auxiliary device for an oven (4) designed to be operated in a space (2) in order to heat the air in that space has an essentially closed chamber (26) which is designed to receive heat from the oven (4), a first inlet (22) which is designed to guide air (C) into the chamber (26) where it is heated, an outlet (30) which is designed to give off, from the chamber (26) into the space (2), the air (W) heated in the chamber (26), an air flow setting device (24, 28) which is designed to set the air flow (A) through the chamber (26), a space air temperature measuring device (42) which is designed to measure the temperature of the air in the space, and a control device (40) which is designed to control the air flow setting device (24, 28) in dependence on the output signal from the space air temperature measuring device (42) such that the air flow setting device (24, 28) is prompted to permit an air flow (A) through the chamber (26) only while the temperature of the air (2) in the space is below a space air temperature setpoint value (RT_soll).

Description

Additional device for an oven and oven with such a device

The invention relates to an additional device for a furnace, which is designed to be operated in a room to heat the room air. Furthermore, the invention relates to a furnace with such a device.

Furnaces have long been known in various designs and are usually used in a substantially closed space to heat the room air. Depending on the design, the furnaces can be operated with different solid, liquid and / or gaseous fuels, by the combustion of which heat is generated, which is emitted in rooms operated furnaces as radiant heat and / or convection heat. This results in a particularly high radiant heat during the combustion process in the immediate vicinity of the furnace, which often leads to an uneven heat distribution in the room.

Also known are solutions to equip wood-burning stoves with a heat exchanger, in particular to use the flue gases discharged through the chimney for additional heat recovery. With the aid of such an additional heat exchanger, which can be provided both as part of a furnace and thus together with the furnace and as retrofittable accessories in the form of a separate component to be mounted on the furnace, the efficiency of the furnace can be improved, which in particular increases the Room air temperature leads. Depending on the design and construction of the additional heat exchanger, in particular with regard to the type and orientation of the discharged heated additional air, the heat distribution in the room can also be positively influenced.

DE 32 1 1 488 A1 discloses a device for supplying fresh combustion air for fireplaces such as ovens in enclosed spaces, in which a fresh air channel communicating with the outside air is provided, which is in contact with exhaust gases flowing through the flue-gas pipe of the furnace ring is widened and the smoke tube tightly encloses.

From DE 10 2006 062 535 B4 an additional device for a stove is known which can be heated with solid fuels and is operated without supply of fresh air. This auxiliary device is equipped with a channel having a first section for supplying fresh air and a second section with a shut-off device for removing heated air. The channel is in direct contact for heating the air with the hot flue gas of the Rauchgasabführungsroh- res of the stove, by concentric around the Rauchgasabfüh- tion tube, to form an annular channel, a jacket tube is arranged. The jacket tube has two arranged by at least 90 ° stub, wherein the one connecting piece with a first channel section for supplying fresh air and the other connecting piece with an upward second channel section for the discharge of heated air is in communication. The first channel section is connected to a further channel for the intake of room air, in which at least one obturator is integrated. In the section of the first channel section, which lies before the integration of the channel for the intake of room air, a further obturator is arranged. During the operating state of the stove, depending on the room temperature, fresh air or room air or a mixture of fresh air and room air enters the annular channel by adjusting the shut-off elements. It is an object of the present invention to improve the operation of the additional device of the type mentioned.

This object is achieved with an auxiliary device for an oven, which is designed to be operated in a room to heat its room air, with a substantially closed chamber, which is adapted to receive heat from the oven, a first inlet formed is to direct air into the chamber in which it is heated, an outlet adapted to discharge the air heated in the chamber from the chamber into the room, an air flow setting device adapted to adjust the flow of air through the chamber, a room air temperature measuring device configured to measure the temperature of the room air; and a controller configured to control the air flow setting direction in response to the output signal of the room air temperature measuring device so as to cause the air flow setting direction to allow air flow through the chamber only as long as the room air temperature measuring means Temperature of the room air below a Ra circulating air temperature setpoint.

The substantially closed chamber, which is provided for receiving heat from the furnace and preferably channel-shaped, takes on the task of a heat exchanger. Cold air flows into the chamber via the first inlet where it is warmed up and enters the room as heated air via the outlet. In this way, the efficiency of the furnace can be improved, wherein the additional device according to the invention can be optionally provided as part of the furnace or as retrofittable accessories in the form of a separate and to be attached to the furnace component.

Furthermore, a regulation of the air flow through the chamber is provided according to the invention. For this purpose, a Luftstromeinstelleinnchtung for adjusting the air flow through the chamber, a room air temperature measuring device for measuring the temperature of the room air and a control device are used. In this case, the control scheme according to the invention implemented in the control device is to control the air flow setting direction as a function of the output signal of the room air temperature measuring device, so that the Luftstromeinstelleinrichtung is made to allow air flow through the chamber only as long as the room air temperature is below a room air temperature setpoint. In general, the room air temperature setpoint is specified as a predetermined setpoint. Thus, according to the invention, the air flow is only released through the chamber and thus ultimately the auxiliary device is activated when the room air temperature is below the room air temperature setpoint. If, on the other hand, the room air temperature increases to a value above the room air temperature setpoint value, the air flow through the chamber is switched off according to the invention and thus ultimately the auxiliary device is deactivated. In this way, a better indoor climate can be achieved by making better use of the existing heat output of the oven.

Preferred embodiments and further developments of the invention are specified in the dependent claims.

Basically, it is sufficient to let the air flow through the chamber only because of convection effect. On the one hand to be able to realize a stronger air flow through the chamber and on the other hand a more targeted heat distribution within the room, the air flow adjusting device preferably has a fan or a fan.

In a preferred development of this embodiment, the speed of the fan is controllable and the control device further configured to control the fan so that the speed of the fan decreases with decreasing difference of the room temperature to the predetermined room air temperature setpoint and is increased with increasing difference. The advantage of this embodiment is that an abrupt turn on or off the air flow is avoided when falling below or exceeding the indoor air temperature setpoint, but that a substantially continuous and thus sliding control of the air flow takes place, under stepless control or regulation, a control or Regulation in discrete stages or steps is to be understood. This stepless control concept is to increase the speed of the fan and the air flow generated thereby, the farther the Room air temperature drops below the room air temperature setpoint, and to decrease, the closer the room temperature to the room air temperature setpoint increases until the fan is turned off when the room temperature has reached the room air temperature setpoint and possibly even exceeds it.

Preferably, the Luftstromeinstelleinrichtung a shut-off, which is designed to open the inlet and close.

In a development of this embodiment, the obturator is controllable in such a way that the effective opening cross-section released by the obturator, preferably substantially continuously, can be adjusted between zero in the fully closed state and a maximum value in the fully opened state, and the control device is further configured, To control the obturator so that its effective opening cross-section decreases with decreasing difference of the room temperature to the predetermined room air temperature setpoint and is increased with increasing difference. In this embodiment, therefore, the same control scheme as in the embodiment described above is applied.

In a further preferred embodiment, the control of the Luftstromeinstelleinrichtung in response to the output of the Raumlufttemperatur- measuring device is switched off, so that in the off state, the Luftstromeinstelleinrichtung is caused to permanently conduct air through the chamber. This version offers the possibility of a pure ventilation function, especially when the stove is cold.

In another preferred embodiment, an oven temperature measuring device configured to measure the temperature of the heat generated by the oven is provided, wherein the controller is further configured to control the air flow adjusting device in response to the output of the oven temperature measuring device, thereby causing the air flow adjusting device to stop the flow of air through the chamber when the temperature of the heat produced by the stove is below a minimum setpoint temperature. The minimum oven temperature setpoint can be, for example, from Operator can be specified. With this embodiment, a so-called standby control is realized, thereby ensuring that the air flow adjusting device only works and thus air is passed through the chamber when the furnace also gives off sufficient heat. Thus, the air flow through the chamber is released only when the temperature of the heat generated by the furnace is above the minimum oven temperature setpoint. If, on the other hand, the temperature of the heat generated by the furnace falls below the minimum oven temperature set point, the air flow through the chamber is interrupted and as a result the additional device is deactivated.

In a further development of this embodiment, optionally the control of the air flow setting device can be switched off as a function of the output signal of the furnace temperature measuring device, so that in the switched-off state the air flow setting device operates independently of the output signal of the furnace temperature measuring device. Such operation of the auxiliary device regardless of the operating state of the furnace offers the possibility of a pure ventilation function, especially in a cold oven.

In a further development of this embodiment, an outside temperature measuring device is provided, which is designed to measure the outside temperature outside a building, and the control device is further configured to specify the minimum oven temperature setpoint in dependence on the output signal of the outside temperature measuring device such that the minimum oven temperature setpoint is raised when the outside temperature decreases , Accordingly, in this embodiment, the auxiliary device is activated or deactivated not only as a function of the operating temperature of the furnace but also as a function of the outside temperature. This is done according to the invention in that, depending on the measured outside temperature, the minimum oven temperature setpoint is adjusted accordingly, and indeed the lower the outside temperature, the higher is the minimum oven temperature setpoint. In this way, an excessive cooling of the furnace is prevented by the additional device, thus avoiding an impairment of the combustion process in the furnace. In a further embodiment, which is intended for a substantially exclusively with the room air-driven oven, a first inlet is provided, which is adapted to receive room air and to lead to the chamber, a second inlet is provided, which is formed, air from a To receive outside of the space and to lead to the chamber, the first and second inlets are connected to a switch, which has a switching device, which is adapted to switch completely or partially between the first and second let in, an outside temperature measuring device is provided, which is formed to measure the outside temperature outside a building, and the controller is further configured to adjust the switching means of the switch in dependence on the output signals of the room temperature measuring device and the outside temperature measuring device. Thus, in this embodiment, depending on the outside temperature and the temperature difference to the room temperature, the reference of the air is set either from the room or from an environment outside the room, which in the latter case is usually outside fresh air.

Alternatively, it is also conceivable to design the inlet in such a way that only air from an environment outside the room is directed into the chamber. Thus, this embodiment is particularly suitable for the supply of fresh air in conjunction with a furnace operated substantially exclusively with the room air and thus without fresh air supply.

The chamber should expediently have side walls between which the air taken in by the inlet is guided and at least one side wall of which is at least partially engageable or alternatively formed in contact with at least one section of at least one side wall of the furnace, at least a portion of at least one side wall of the furnace To form furnace. Thus, the auxiliary device according to the invention can be used in the former case as retrofittable accessories in the form of a separate, to be arranged on the furnace unit and in the latter case as part of the furnace. For the said side wall serves as a partition between the chamber of the additional device and the combustion chamber of the furnace, which due to the contacting arrangement with at least one side wall of the furnace or due to its integral formation with the side wall of the furnace, transfers the heat from the combustion chamber of the furnace directly into the chamber where the air passes by that heated side wall, without, of course, in enter the combustion chamber of the furnace.

Meanwhile, a not inconsiderable proportion of ovens available on the market by default on at least one side, in particular the back, provided with a double-walled arrangement having an inner side wall, a spaced therefrom outer side wall and a cavity formed between these two side walls. Such a double-walled arrangement whose original purpose consists in a better thermal insulation, can now be used according to the invention skillfully for the formation of the additional device by the cavity of the double-walled arrangement is used as a chamber of the additional device.

To produce a desired convection effect in the air flow, it is expedient to arrange the outlet above the inlet.

In order to effectively use in particular the furnace exhausted and still hot flue gases for additional heat recovery, it is advantageous to provide the outlet for arrangement in the region of the flue gas outlet pipe of the furnace.

For convenient operation, it is advantageous that the control device has a remote control. Preferably, the remote control may include the room air temperature measuring device, which may transmit its data by cable or preferably wirelessly to the control device. This ensures a particularly accurate and thus effective control of the room air temperature at the point where the user is staying, provided he carries the remote control in a structurally particularly simple and at the same time clever. Furthermore, it is expedient to provide a CO measuring device which is designed to measure the CO content in the room air and to trigger an alarm, in particular when an upper limit value is exceeded. In this context, it is structurally particularly advantageous to integrate the CO measuring device in the remote control.

Although the additional device according to the invention is basically suitable for all types of furnaces, it is preferably intended for the use of stoves, which generally obtain the combustion air required for combustion from the room air substantially without external fresh air supply and are often heated with solid fuels.

Hereinafter, preferred embodiments of the invention will be explained in more detail with reference to the accompanying drawings. Show it:

Figure 1 is a set up in a room oven with the additional device according to the invention according to a first preferred embodiment in a simplified representation as a partially sectioned side view.

FIG. 2 schematically shows the oven with the additional device of FIG. 1 in a partially sectioned perspective view, with the outer side wall partially removed from the chamber of the additional device; FIG.

3 shows a stove set up in a room with the additional device according to the invention according to a second preferred embodiment in a simplified representation as a partially sectioned side view (a) and partially sectioned front view (b).

4 shows a stove set up in a room with the additional device according to the invention according to a third preferred embodiment in a simplified representation as a partially sectioned front view. and Fig. 5 is a set up in a room oven with the additional device according to the invention according to a fourth preferred embodiment in a simplified representation as a partially sectioned side view.

As can be seen schematically in FIGS. 1 and 2, a furnace 4 is installed in a space 2 of which partly a wall 2a and a bottom 2b are shown. The furnace 4 contains a combustion chamber 6, in which fuel is burned, for which purpose the air referred to below as "room air" from the space 2 is used, which enters the combustion chamber 6 through air inlets, not shown. Preferably, the air inlets, not shown, in the region below and above a likewise not shown in the drawings door of the furnace 4 are formed to receive cold room air from the region of the bottom 2b of the space 2, which flows from bottom to top, in the combustion chamber. 6 of the furnace 4 provides for the combustion of the fuels. At the top of the combustion chamber 6 is followed in the embodiment shown in Figures 1 and 2, an exhaust pipe stub 8 for discharging the flue gas, which has at its upper end an opening 10 to which a not shown in the figures exhaust pipe is connected by that the flue gases are led out of room 2 into the open air. Due to the combustion of the fuels in the combustion chamber 6 heat is generated, which is discharged from the oven 4 in the room 2 as radiant heat.

Thus, in the illustrated embodiment, the oven 4 is designed as a wood-burning stove, which generally obtains the combustion air required for combustion from the room air without external fresh air supply and is heated in particular with solid fuels such as wood. Of course, other types of furnaces are conceivable, which can be operated in addition to or instead of solid fuels with liquid or gaseous fuels.

To improve the efficiency of the furnace 4, an additional device 20 is provided, which has an inlet pipe 22, the inlet opening 22a in the illustrated embodiment on the outside of the wall 2a of the roughness with 2 is located. Accordingly, in the illustrated embodiment, the inlet pipe 22 is guided through the wall 2a and provided for receiving air outside the room 2. This air is fresh air that differs from the room air. Thus, in the illustrated embodiment, in contrast to the oven 4, the additional device 20 for receiving not the room air, but provided by fresh air outside the room 2, wherein it is preferably outside air fresh air from the environment outside the building, in which the room 2 is located. Of course, it is nevertheless also conceivable to use the additional device 20 as an alternative to receiving the room air.

In the illustrated embodiment, the inlet tube 22 includes a shut-off device in the form of a butterfly valve 24 which is pivotally mounted within the inlet tube 22. The butterfly valve 24 has the shape of a disk whose dimensions correspond to the inner cross section of the inlet pipe 22. Due to the pivotable mounting, the butterfly valve 24 can be in a closed position in which they aligned transversely to the longitudinal direction of the inlet tube 22 and with its outer edge, the inner wall of the inlet tube 22 substantially sealingly touches and thus closes this, and pivot a maximum open position in which they is aligned approximately in the longitudinal direction of the inlet pipe 22, as shown schematically in Fig. 1, and thus leaves the opening cross section of the inlet pipe 22 is substantially unaffected. The butterfly valve 24 is adjustable by an actuator, not shown in the figures. The adjustment takes place continuously in the illustrated embodiment, wherein under an infinite adjustment and an adjustment in several discrete steps or stages is to be understood. Accordingly, the butterfly valve 24 can also spend in positions between the open position and the closed position in which it reduces the effective opening cross-section of the inlet pipe 22.

The inlet pipe 22 leads to a channel-shaped chamber 26 which, in the illustrated embodiment, is essentially flat, is arranged on at least one vertical outside of the furnace 4 adjacent to the combustion chamber 6 and is thus oriented vertically. In the first shown in Figures 1 and 2 Embodiment, the chamber 26 is bounded by a first wall 26 a, which also forms a vertical outer wall of the furnace 4 at the same time. Thus, this wall 26a also performs the function of a partition between the combustion chamber 6 of the furnace 4 and the interior of the chamber 26 of the auxiliary device 20. To the outside and thus to the environment or the room 2, the chamber 26 is sealed off by a further wall 26b, which is arranged at a distance and substantially parallel to the first wall 26a. Thus, between the first and second walls 26a, 26b, a vertically oriented, substantially flat, channel-like cavity of the chamber 26 is formed. Since in the illustrated embodiment, the first wall 26a is a common wall for both the oven 4 and the chamber 26 of the additional device 20, form in this embodiment, the oven 4 and the additional device 20 is a structural unit. Alternatively, it is also conceivable to provide the chamber 26 with its own walls, of which the furnace 4 adjacent wall is provided for a contacting arrangement with the opposite outside of the furnace 4. In this latter case, the chamber 26 and thus also the entire additional device 20 can be implemented as a separate component and thus as a retrofittable accessory.

Meanwhile, a not inconsiderable proportion of the ovens available on the market by default on at least one side, in particular the back, provided with a double-walled arrangement, which forms an inner side wall first wall 26 a, which forms a spaced from this outer side wall second wall 26 b and a Having formed between these two walls 26a, 26b cavity. Such a double-walled arrangement, the original purpose of which is better thermal insulation, can now be skillfully used for the formation of the auxiliary device 20 by using the cavity of the double-walled arrangement as the chamber 26 of the auxiliary device. The inlet tube 22 opens into the bottom of the chamber 26. Thus, the fresh air received from the inlet tube 22, whose flow is indicated schematically in the figures by arrows labeled "C", enters the chamber 26 and rises in the chamber 26 due to its vertical orientation upwards, as indicated schematically in the figures by arrows marked with "A". While moving through the chamber 26 At the top, the air A also comes into contact with the first wall 26a. During operation of the furnace 4, the heat generated in its combustion chamber 6 is not only emitted into the room 2 as radiant heat, but also transmitted through the common wall 26a into the chamber 26, so that the air A located there is heated. Although it may in principle be sufficient to allow the air A to rise only through convection effect through the chamber 26, in the illustrated embodiment, a fan 28 is additionally provided at the junction between the inlet pipe 22 and the chamber 26 to the air flow through the chamber 26th to reinforce. The speed of the fan 28 and thus the air flow generated by it is substantially infinitely variable and controllable, under stepless controllability is also a control of the speed of the fan 28 in several discrete steps or stages to understand. Accordingly, the chamber 26 of the auxiliary device 20 takes over the actual function of a heat exchanger in order to heat the fresh air received through the inlet pipe 22 accordingly.

As can also be seen from FIGS. 1 and 2, the chamber 26 opens at its upper side into a space through which the exhaust pipe socket 8 extends. This located above the combustion chamber 6 space forms the outlet 30 for discharging the heated air, the flow is now shown by arrows "W" schematically shown in the room 2. Because of the described arrangement of the flue pipe spigot 8 is surrounded by the heated air W and In this case additionally heated by the heat emitted by the flue pipe spigot 8 due to the heat of the flue gases, so that the exhausted through the flue pipe 8 flue gases are used for additional heat recovery.

Compared to the first embodiment shown in Figures 1 and 2 but also any other arrangements and configurations, in particular the chamber 26 and the outlet 30 are conceivable.

Thus, in FIGS. 3 a and 3 b, a second preferred exemplary embodiment is shown, which differs from the first exemplary embodiment according to FIGS. 1 and 2 in that the chamber 26 is arranged in two adjacent to one another. de, vertically oriented sub-chambers 26 c, 26 d is divided over almost the entire height or vertical length of the chamber 26 separated by a vertically arranged partition wall 26 b and only in the upper region of the chamber 26 are interconnected. Another difference from the first embodiment is that the outlet 30 arranged in a similar manner as the inlet 22 in the vicinity of the bottom 2b of the space 2, thereby positioned below the combustion chamber 6 of the furnace 4 and formed as a pipe socket and the fan 28 (not between the inlet pipe 22 and the chamber 26, but) between the chamber 26 and the outlet 30 is arranged. In this second exemplary embodiment, the air A first, coming from the inlet pipe 22, flows upwards along the first sub-chamber 26c and then downwards again along the second sub-chamber 26d, and then enters an inlet 32 of the fan 28.

Fig. 4 shows a third preferred embodiment, which differs from the first embodiment according to Figures 1 and 2 in that the chamber 26 is divided into three sub-chambers 26f, 26g and 26h, of which the first sub-chamber 26f (in the same way as the chamber 26 as a whole in the first embodiment) is arranged on an outer side of the furnace 4 and provided for guiding the air to be heated A in the upward direction, the second sub-chamber 26g in the region of the exhaust pipe 8 in the horizontal direction above the combustion chamber 6, not shown in Fig. 4 and the third sub-chamber 26h is disposed on the opposite outer side and formed to forward the air to be heated A in the downward direction. This embodiment also differs from the first embodiment according to FIGS. 1 and 2 in that, similar to the second embodiment, the outlet 30 is arranged in the vicinity of the bottom 2b and designed as a pipe socket and the fan 28 is connected to the connection (not between the inlet pipe 22 and the first sub-chamber 26f, but) between the third sub-chamber 26h and the outlet 30 is arranged.

Fig. 5 shows an example of a fourth preferred embodiment, which differs from the first embodiment according to Figures 1 and 2 in particular in that the flue pipe spigot 8 of the furnace 4 with a Rauchabgasverlängerungsrohr 8a is provided, at whose free end provided opening 10 a leading out of the space 2 and not shown in the figures exhaust pipe is connected. In order to utilize the flue gases discharged via the exhaust extension tube 8a for additional heat recovery, the auxiliary device 20 is provided with an additional chamber 27 which communicates with the chamber 26, forms a kind of extension of the chamber 26 and at least partially surrounds the smoke exhaust extension tube 8a. In this case, the additional chamber 27 (in principle in a manner similar to the chamber 26 in the second embodiment according to FIG. 3b) is subdivided into two vertically oriented and juxtaposed partial chambers 27a, 27b. For this purpose, the additional chamber 27 includes a likewise extending in the vertical direction partition wall 27c, which separates the two sub-chambers 27a, 27b from each other and extends over almost the entire height of the additional chamber 27, wherein in the upper portion, the two sub-chambers 27a, 27b connected to each other are. At the downstream end of the second sub-chamber 27b, the outlet 30 is provided, which is arranged above the furnace 4 in contrast to the first embodiment.

For the control and regulation of the air flow through the inlet pipe 22, the chamber 26 (and the additional chamber 27 in the fourth embodiment of FIG. 5) and the outlet 30, a control and regulating unit is provided, which is representative of all mentioned embodiments only in Fig. 1 is shown schematically and designated by the reference numeral "40". In the illustrated embodiment, a room air temperature sensor 42, an oven temperature sensor 44, an outside temperature sensor 46 and a CO sensor 48 are connected to this control and regulation unit 40. The connection between the control and regulation unit 40 and the sensors 42 to 48 may be wired or wirelessly realized. As can be seen schematically in FIG. 1, the room air temperature sensor 42 and the CO sensor 48 are inside the room 2 and the oven temperature sensor 44 is arranged in the oven 4 above the combustion chamber 6, while the outside temperature sensor 46 is arranged on the outside of the wall 2a delimiting the room 2 is arranged, as shown schematically in Fig. 2, just not the temperature of the room air, but the outside of the room 2 and in particular to capture the prevailing outside of the building containing the space 2. As further shown in FIG. 2, a remote control 50, for example, which communicates wirelessly with the control and regulation unit 40 shown in FIG. 1 and contains important operating elements for the operation of the furnace 4 and the additional device 20, is provided. Also in the remote control 50 also the room air temperature sensor 42 and the CO sensor 48 may be included.

As further shown in FIG. 1, there is the possibility of inputting a room air temperature setpoint RT _so n into the control and regulation unit 40, which may preferably take place using the aforementioned remote control 50, and the control unit 40 is further connected to the Shut-off valve 24 and the fan 28 connected to control them as actuators accordingly, which will be described in more detail below.

In the control and regulation unit 40, a control scheme is implemented, after which the butterfly valve 24 and the fan 28 are controlled in response to the output of the room air temperature sensor 42 so that an air flow according to the arrows C, A and W through the additional device 20 is only possible as long as the room air temperature is below the room air temperature setpoint RT _so n. Only in this case is opened by the control and regulating unit 40, the butterfly valve 24 and the fan 28 activated. In contrast, increases the room air temperature to a value above the ambient air temperature setpoint _so RT n, the control and regulation unit 40 causes closure of the butterfly valve 24 and a shut down of the fan 28th

Since the effective opening cross-section of the inlet pipe 22 released by the shut-off flap 24 can be adjusted essentially continuously between zero in the completely closed state and a maximum value in the fully opened state, the shut-off flap 24 can preferably be additionally controlled by the control and regulation unit 40, that the effective opening cross-section _as n increases with increasing difference of the room temperature to the room air temperature setpoint RT and with decreasing difference is reduced as long as the room temperature is below the room air temperature setpoint RT _S0 || lies.

A comparable control scheme is also used with the fan 28 in the present embodiment. Thereafter, the fan 28 is controlled by the control and regulation unit 24 so that the speed of the fan 28 with increasing difference of the room temperature to the room air temperature setpoint RT _S0 || is increased and decreased with decreasing difference, as long as the room temperature is below the room air temperature setpoint RT _so n. Thus, it is this control and regulation concept is to increase and the speed of the fan 28 to enhance the flow of air generated thereby, the further the room air temperature _as n drops below the ambient air temperature setpoint RT, and to decrease the closer the room temperature rises towards the room air temperature setpoint RTson out until the fan 28 is switched off by the control and regulation unit 40 when the room temperature has reached the room air temperature setpoint RTson and possibly even exceeds it.

If the control of the butterfly valve 24 and the fan 28 takes place substantially steplessly in both cases, the activation of these two actuators should take place substantially synchronously. Alternatively, it is also conceivable to spend the shut-off valve 24 selectively only in the closed position when the room temperature exceeds the room air temperature setpoint RT _so n, and otherwise spend in the full open position and apply the stepless control only to the speed of the fan 28. Furthermore, it is alternatively conceivable to have only one of these two actuators controlled by the control and regulation unit 40 or even to use it.

The control and regulation concept implemented in the control and regulation unit 40 furthermore requires a dependence of the activation of the shut-off flap 24 and of the fan 28 in dependence on the output signal of the oven temperature sensor 44.

Thereafter, the butterfly valve 24 is only opened and the fan 28 is activated when the temperature measured by the oven temperature sensor 44 of the furnace 4 generated heat is above a Mindestofentemperatursollwert. In this way, a so-called standby control is realized, which ensures that the additional device 20 only works and thus air is passed through the chamber 26 when the oven 4 also emits sufficient heat. If, on the other hand, the temperature of the heat generated by the oven 4 drops below the minimum oven temperature set point, then the control and regulation unit 40 causes the butterfly valve 24 to close and the fan 28 to be switched off.

The mentioned minimum oven temperature setpoint can be specified by the operator. Alternatively, however, it is also conceivable that in the control and regulation unit 40, the minimum oven temperature setpoint is adjusted in dependence on the output signal of the outside temperature sensor 46 such that the minimum oven temperature setpoint is raised when the outside temperature decreases.

Furthermore, the control and regulating unit 40 has a further feature, according to which in an alternative operating state, regardless of the output signals of the mentioned sensors 42, 44, 46, the shut-off valve 24 is always fully open and the fan 28 is activated. In such an operating state, the control is thus in fact switched off, which offers the possibility of a pure ventilation function, in particular in the case of a cold oven 4.

The CO sensor 48 measures the CO content in the room air and causes the control and regulation unit 40 when an upper limit is exceeded to trigger a corresponding alarm.

Claims

claims

An additional device for an oven (4), which is adapted to be operated in a room (2) to heat the room air, with

a substantially closed chamber (26) adapted to receive heat from the furnace (4),

a first inlet (22) adapted to direct air (C) into the chamber (26) in which it is heated,

an outlet (30) adapted to discharge the air (W) heated in the chamber (26) from the chamber (26) into the space (2),

an air flow adjustment means (24, 28) adapted to adjust the air flow (A) through the chamber (26),

a room air temperature measuring device (42), which is designed to measure the temperature of the room air, and

control means (40) adapted to control the air flow setting means (24, 28) in response to the output of the room air temperature measuring means (42) so as to cause the air flow setting means (24, 28) to move an air flow (A) through Only allow chamber (26) as long as the temperature of the room air (2) is below a room air temperature setpoint (RTsoii).

2. Device according to claim 1, wherein the Luftstromeinstelleinnchtung comprises a fan (28).

3. The apparatus of claim 2, wherein the speed of the fan (28) is controllable and the control device (40) is further configured to control the fan (28) so that the speed of the fan (28) with decreasing difference in the room air temperature is reduced to the predetermined room temperature setpoint (RTsoii) and increased with increasing difference.

4. The device according to at least one of the preceding claims, wherein the Luftstromeinstelleinnchtung a shut-off device (24) which is adapted to open the inlet (22) and close.

5. Apparatus according to claim 4, wherein the obturator (24) is controllable such that a from the obturator (24) releasing effective opening cross-section, preferably substantially continuously, adjusted between zero in the fully closed state and a maximum value in the fully open state and the control means (40) is further adapted to control the obturator (24) so that its effective opening area decreases as the difference in room temperature decreases from the predetermined room air temperature setpoint (RT _so n) and increases as the difference increases.

6. The device according to at least one of the preceding claims, wherein the control of Luftstromeinstelleinnchtung (24, 28) in response to the output of the room air temperature measuring device (42) is switched off, so that in the off state, the Luftstromeinstelleinnchtung (24, 28) is caused, permanently air (A) through the chamber (26) to conduct.

Apparatus according to any one of the preceding claims, further comprising oven temperature measuring means (44) adapted to measure the temperature of the heat generated by the oven (4), the controller (40) being further adapted to control the air flow setting means (24, 24). 28) in response to the output of the oven temperature measuring means (44), causing the air flow setting means (24, 28) to stop the air flow (A) through the chamber (26) when the temperature of the heat generated by the oven (4) below a minimum oven temperature setpoint.

8. Apparatus according to claim 7, wherein the control of the Luftstromeinstelleinnchtung (24, 28) in response to the output of the oven temperature measuring device (44) is switched off, so that in the off state, the Luftstromeinstelleinnchtung (24, 28) regardless of the output signal of the oven temperature measuring device (44) is working.

9. Apparatus according to claim 7 or 8, wherein an outside temperature measuring device (46) is provided, which is designed to measure the outside temperature outside a building, and

the control device (40) is further configured to specify the minimum oven temperature setpoint in dependence on the output signal of the outside temperature measuring device (46) such that the lower the outside temperature, the higher the minimum oven temperature setpoint.

10. The device according to at least one of the preceding claims for a substantially exclusively operated with the room air oven, in which

a first inlet is provided, which is adapted to receive room air and lead to the chamber,

a second inlet is provided, which is adapted to receive air from an environment outside the room and lead to the chamber,

the first and second inlets are connected to a switch having a switching member configured to switch completely or partially between the first and second inlets;

an outside temperature measuring device is provided, which is designed to measure the outside temperature outside a building, and

the control device is further adapted to adjust the switching means of the switch in dependence on the output signals of the room temperature measuring device and the outside temperature measuring device.

1 1. A device according to at least one of claims 1 to 9 for an exclusively room air-driven oven in which the inlet (22) is formed, air (C) from an environment outside the room (2) in the chamber (26). to lead.

12. The device according to at least one of the preceding claims, wherein the chamber (26) side walls (26 a, b), of which at least one side wall (26 a) at least partially in contact either with at least a portion of at least one side wall of the furnace (4). can be brought or formed, at least a portion of at least one at the same time Side wall of the furnace (4) to form, to transfer heat from the oven (4) in the chamber.

13. The device according to at least one of the preceding claims, wherein the outlet (30) is arranged above the inlet (22).

14. The device according to at least one of the preceding claims for a furnace (4) with a flue gas discharge pipe (8), wherein the outlet (30) for arrangement in the region of the flue gas discharge pipe (8) is provided.

15. The device according to at least one of the preceding claims, wherein the control device (40) comprises a remote control (50) containing the room air temperature measuring device (42).

16. The device according to at least one of the preceding claims, with a CO measuring device (48) which is designed to measure the CO content in the room air and in particular to trigger an alarm when an upper limit value is exceeded.

17. Device according to claim 15 and 16, wherein the remote control (50) is provided with the CO measuring device (48).

18. Oven with a device (20) according to at least one of the preceding claims.

19. Oven according to claim 18, having a at least one side, in particular its rear side, provided double-walled arrangement having an inner side wall (26 a), a spaced therefrom outer side wall (26 b) and between these two side walls (26 a, b) having formed cavity,

characterized in that the chamber (26) of the auxiliary device (20) is formed by the cavity.