DE102011120503A1 - Measuring method for measuring value recovery of oven in atmospheric fire place in kitchen, involves arranging temperature sensor at smoke pipe, arranging pressure measuring points in oven region, and installing optical sensor in region - Google Patents

Abstract

The method involves arranging a temperature sensor (6) at a smoke pipe (5). Pressure measuring points are arranged with a negative pressure hose (7) in a region (9) of an oven between an ash box and an oven door (10), and a negative pressure hose (8) in space (1). An optical sensor is installed in the region. Required measurement values are evaluated by evaluation devices (T, P) that are accommodated in the housing. A control circuit is provided a control unit (2) that is separated from required components for wiring. An evaluation unit for an optical sensor is provided in the control unit.

Description

Original task:

According to the fireplace ordinance, it must be ensured that there is sufficient supply of fresh air during the simultaneous operation of the fireplace and the motorized extractor hood. The prior art provides for an electrical shutdown of the hood when the window is closed. Thus, their operation is only possible with the windows open, regardless of whether the fireplace is operated or not. This is based on a differential pressure of 4 Pascal measured between space and outside air.

• – Mauerdurchbruch erforderlich
• – Heizkostenerhöhung im Winter
• – Kabelführung durch den Raum
• – erzwungenes Fensteröffnen
• – kein Bezug zur Feuerstättenbetrieb

This causes disadvantages:

• - Wall breakthrough required
• - Heating costs increase in winter
• - Cable routing through the room
• - open forced window
• - no relation to the fireplace operation

solution

Recording of the fireplace operation via measured values obtained at the furnace, their evaluation and control of the fume hood.

By using a different measuring principle for differential pressure detection between room and kiln train and operating state detection of the fireplace over the exhaust pipe temperature is a comfortable and automatic operation of both systems simultaneously possible without a forced opening of the window for Luftnachströmung.

Achieved benefits

• - Constant monitoring of the differential pressure between the room and the suction area of the furnace;
• - Automatic recognition of commissioning of the fireplace;
• - Automatic detection of fire extinguishing in the fireplace;
• - Automatic recognition of the opening of the Feuerstättentur;
• - Controls the extractor automatically;
• - Prevents a drop of the differential pressure below 4 Pascal by the fan of the extractor hood and thus a dangerous inflow of the exhaust gases into the room;
• - Heating energy cost savings, since the window does not have to be forced open;
• - The usual work in the kitchen is still possible;
• - With automatic disconnection of the extraction hood, the operator can choose for himself whether the fan step is lowered, whether a door is opened, whether a window is opened, or another measure is taken to allow sufficient air to flow in;
• - There are no time-consuming laying or drilling required;
• - Fast installation possible
• - Low manipulation possibilities due to internal electrical connection of the extractor hood and sealable housing

Further embodiment of the invention

• - Installation of an additional optical sensor for faster detection of the heating phase in the area ( 9 ) according to claim 1.
• - Design of the control unit ( 2 ) According to claim 2 with additional control means to control the hood automatically on the speed levels

function Description

In the solid fuel furnace ( 4 ) ignites a fire, the temperature at the smoke pipe rises ( 5 ), the temperature sensor ( 6 ) registers a temperature rise, which in the evaluation part (T), located in the control unit ( 2 ), and for electrical disconnection of the supply voltage line ( 11 ) of the fume hood ( 3 ) leads.

An electrical connection of the supply voltage line ( 11 ) is triggered by the pressure evaluation part (P) when a differential pressure of 4 Pascal between the minus hose ( 7 ), which limits the pressure in the area ( 9 ) between the ash box and the oven door ( 10 ) and the plus tube ( 8th ), the pressure in the room ( 1 ) is reached.

As long as the oven door ( 10 ), no differential pressure can be detected by the pressure evaluation section (P) and the extractor hood ( 3 ) can not operate.

After closing the oven door ( 10 ) the differential pressure between minus hose ( 7 ) and plus hose ( 8th ) in the evaluation part (P). As soon as the differential pressure rises above 4 Pascal, the pressure evaluation section (P) supplies the power supply for the extractor hood ( 3 ) via the supply voltage line ( 11 ) and the extractor hood ( 3 ) goes into operation;
Register the temperature sensor ( 6 ) a temperature drop on the flue pipe ( 5 ) to 40 ° C, the evaluation section (T) switches to normal operation for the extractor hood ( 3 ), so that the supply voltage line ( 11 ) is switched on, because the fire is extinguished;
Register the temperature sensor ( 6 ) again a temperature increase to over 41 ° C on the flue pipe ( 5 ), the control of the fume hood ( 3 ) in the control section ( 2 ) located evaluation parts (T) and (P) again.

LIST OF REFERENCE NUMBERS

1

room

2

control unit

3

hood

4

Atmospheric fireplace (here oven)

5

exhaust pipe

6

temperature sensor

7

Pressure sensor line (minus hose)

8th

Pressure sensor line (plus hose)

9

Oven area between oven door and ash box

10

oven door

11

Power supply line for the fume hood ( 3 )

State of the art

Results:

• DE 000029810093 U1
• DE 000010028333 A1
• DE 20008031 U1
• DE 20022975 U1
• DE 000010028333 B4
• DE 000010316571 A1

Comparison:

The state of the art and the comparison of results have shown that all the results of the search are suitable for controlling an exhaust hood, but do not use measured values of an atmospheric hearth in the same room in order to avoid a dangerous leakage of smoke into the room.

Thus, this invention has created a new field of technology that meets the fireplace regulations.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 000029810093 U1 [0008]
• DE 000010028333 A1 [0008]
• DE 20008031 U1 [0008]
• DE 20022975 U1 [0008]
• DE 000010028333 B4 [0008]
• DE 000010316571 A1 [0008]

Claims (2)

The patent claim 1 relates to the measuring method for the measurement at the atmospheric fireplace, characterized by the arrangement of the temperature sensor ( 6 ) on the flue pipe ( 5 ) and the arrangement of the pressure measuring points with minus hose ( 7 ) in the area ( 9 ) of the stove between the ash pan and the oven door and the plus hose ( 8th ) in the room ( 1 ) Another embodiment provides the installation of an optical sensor in the area ( 9 ) of the oven. Claim 2 relates to the accommodation of the evaluation devices (T), (P), which obtain the required measured values according to claim 1, in the same housing as the control circuit with the required components for wiring, called control unit ( 2 ). Another embodiment provides for accommodating the evaluation unit for the optical sensor in the control unit (FIG. 2 ) in front.

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