-
The present invention relates to an exhaust hood which is automatically operated by measuring the temperature of the air rising from the cooking device above which the exhaust hood is operated.
-
In general an exhaust hood is installed above household cooking devices. The smell and humidity released by the cooked foods are enabled to be discharged to the outer environment by means of the exhaust hood. In general the user adjusts the low, mid and high levels of the fan motor in the exhaust hood. The user operates the exhaust hood when required during the cooking process and selects the desired level. Exhaust hoods are known wherein the operational level is automatically determined in order to provide convenience to the user and for security purposes. Therefore, sensors which monitor changes in odor and temperature in the environment are used. During the cooking process, the temperature over the cooking device is detected, thus automatically determining the operational level of the exhaust hood. The temperature sensor measures the temperature under the exhaust hood which is caused by the heat of the cooked food and of the cooker. Consequently, the exhaust hood can be automatically started with the level thereof being automatically increased when the thermal load increases, and automatically decreased when the thermal load decreases, and the exhaust hood can be automatically turned off when the thermal load is zero. The position of the temperature sensor which measures the temperature over the cooker is critical in the automatic operation. When the cooking process on the cooker starts, the thermal load of the cooker must be detected without any error. If the temperature sensor is not placed in a suitable area, problems may arise in temperature detection. In particular, it becomes difficult to correctly measure the temperature when the cooking process is performed in different cooker burners.
-
In the state of the art European Patent Application Document No.
EP3867576 (A1 ), an exhaust hood is disclosed, comprising a temperature sensor.
-
The aim of the present invention is the realization of an exhaust hood wherein the temperature of the air rising from the cooking device above which the exhaust hood is operated is correctly measured in a precise manner.
-
The exhaust hood of the present invention explicated in the first claims and the respective claims thereof, comprises a body which is suitable to be positioned above the cooking device so as to be at a certain distance from the cooking device; an air suction duct which is provided in the body and one end of which opens to the outer environment; a casing which is provided in the air suction duct; and a fan which is provided in the casing and which enables the air to move in the air suction duct in an air flow direction so as to be discharged to the outer environment. The exhaust hood of the present invention further comprises at least one temperature sensor which is provided on the casing so as to face a direction opposite to the air flow direction and which is suitable for measuring the temperature of the air in the air suction duct. Thus, the air flowing in the air flow direction in the air suction duct is enabled to be delivered perpendicularly to the temperature sensor. Consequently, the temperature of the air rising as a result of the operation of the cooking device so as to reach the air suction duct can be determined more accurately and precisely. The number of the temperature sensor can be one or more. The air flow direction is the direction the side walls of the air suction duct extend. In the preferred version of the present invention, the air suction duct extends in an upwards direction in the exhaust hood. In different embodiments of the present invention, the air suction duct extends in a sideways direction in the exhaust hood. In this case, the air flow direction is again the direction the air suction duct extends. The temperature sensor is disposed on the casing so as to face the direction opposite to the air flow direction. Thus, the air flowing in the air flow direction within the air suction duct is enabled to be delivered perpendicularly to the temperature sensor.
-
In an embodiment of the present invention, the temperature sensor is disposed on a casing wall which surrounds a casing opening provided on the casing so as to enable air intake into the casing. The temperature sensor is provided on the casing wall so as to face the direction opposite to the air flow direction. The air in the air suction duct flows into the casing through the casing opening. Most of the air sucked towards the casing opening hits the casing wall and reaches the casing opening. By placing the temperature sensor on the casing wall, more air is enabled to pass over the temperature sensor. Thus, the temperature in the air suction duct can be measured more precisely.
-
In an embodiment of the present invention, a casing opening is provided on each side of the casing. The temperature sensors are placed on the casing walls surrounding the casing opening. The exhaust hood comprises at least two temperature sensors such that at least one temperature sensor is positioned on each casing wall. Thus, most of the air in the air suction duct is enabled to be detected by the temperature sensor. Consequently, a more accurate measurement of the air in the air suction duct is ensured.
-
In an embodiment of the present invention, the temperature sensor is disposed in the lower half of the casing facing the cooking device. In a preferred embodiment of the present invention, the exhaust hood is a T-type exhaust hood. In T-type exhaust hoods, the air suction duct extends in the vertical direction upwards with respect to the cooking device. Thus, the air in the air suction duct flows in a vertical direction from bottom to top. The air sucked from the cooking device into the air suction duct first passes through the lower part of the casing. By placing the temperature sensor in the lower half of the casing, the air in the air suction duct is enabled to pass through the temperature sensor without entering into heat exchange with the casing surface. Thus, the temperature of the air rising from the foodstuffs cooked on the cooking device is determined more accurately.
-
In an embodiment of the present invention, the exhaust hood comprises at least two temperature sensors which are provided on the casing so as to be symmetrical with respect to the central height axis. Thus, it becomes possible to measure the temperature of the air rising from the foodstuffs heated on different burners of the cooking device under similar conditions.
-
In an embodiment of the present invention, the exhaust hood comprises a sensor housing which extends on the casing so as to be parallel to the air flow direction and which is suitable for receiving the temperature sensor. Thus, the placement of the temperature sensor on the casing is facilitated. Moreover, the placement of the temperature sensor on the casing so as to the direction opposite to the air flow direction is facilitated. The sensing part of the temperature sensor is placed in the sensor housing so as to face the direction opposite to the air flow direction. In a preferred version of the present invention, the temperature sensor is detachably attached into the sensor housing.
-
In another embodiment of the present invention, the sensor housing is disposed on the casing wall. Thus, the placement of the temperature sensor on the casing wall is facilitated.
-
In an embodiment of the present invention, the temperature sensor is placed onto the sensor housing by means of a holder. By means of the holder, the temperature sensor is enabled to be rigidly fixed to the sensor housing. Moreover, the holder grips the temperature sensor, thus preventing the temperature sensor from being damaged due to factors such as oil, dirt, etc. The holder at least partially grips the temperature sensor like a protective cover, thus increasing the economic life of the temperature sensor.
-
In an embodiment of the present invention, the holder is manufactured from plastic material. Thus, the heat transfer between the temperature sensor and the sensor housing can be reduced cost-effectively. In the preferred embodiment of the present invention, there is an insulation material between the temperature sensor and the holder. Thus, the heat transfer between the temperature sensor and the body can be prevented more efficiently.
-
In an embodiment of the present invention, the temperature sensor is a Type T temperature sensor. In the state of the art, this type of temperature sensors can also be called mushroom type temperature sensor. The receptor of the temperature sensor can be manufactured from aluminum, composite or ceramic material. Since aluminum is a material with high thermal conductivity, the receptor is preferably manufactured from aluminum material.
-
In an embodiment of the present invention, the holder supports the temperature sensor from the stem portion and fixes the temperature sensor on the casing such that the receptor faces the direction opposite to the air flow direction. In other words, the receptor is suspended towards the cooking device without making direct contact with any place. Thus, the receptor is prevented from contacting any place and making direct heat transfer. The temperature sensor is fixed on the body such that the receptor faces the direction opposite to the direction of the air flow. The receptor is provided in the air suction duct through which the air sucked by means of the fan passes.
-
The exhaust hood realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
- Figure 1 - is the perspective view of the exhaust hood related to an embodiment of the present invention.
- Figure 2 - is the bottom perspective view of the exhaust hood related to an embodiment of the present invention.
- Figure 3 - is the schematic view of the air suction duct of the exhaust hood related to an embodiment of the present invention.
- Figure 4 - is the perspective view of detail A in Figure 3.
- Figure 5 - is the perspective view of the exhaust hood related to an embodiment of the present invention.
- Figure 6 - is the perspective view of the detail B shown in Figure 5.
- Figure 7 - is the bottom view of the air suction duct of the exhaust hood related to an embodiment of the present invention.
- Figure 8 - is the exploded view of the fan and the temperature sensor of the exhaust hood related to an embodiment of the present invention.
-
The elements illustrated in the figures are numbered as follows:
- 1.
- Exhaust hood
- 2.
- Body
- 3.
- Air suction duct
- 4.
- Casing
- 41.
- Casing opening
- 42.
- Casing wall
- 5.
- Fan
- 6.
- Temperature sensor
- 61.
- Receptor
- 62.
- Stem portion
- 7.
- Sensor housing
- 8.
- Holder
- 100.
- Cooking device
- X.
- Central height axis
- F.
- Air flow direction
-
The exhaust hood (1) comprises a body (2) which is suitable to be positioned above the cooking device (100) so as to be at a certain distance from the cooking device (100); an air suction duct (3) which is provided in the body (2) and one end of which opens to the outer environment; a casing (4) which is provided in the air suction duct (3); and a fan (5) which is provided in the casing (4) and which enables the air to move in the air suction duct (3) in an air flow direction (F) so as to be discharged to the outer environment. As shown in Figure 1, the cooking device (100) is a cooker. The odor and moisture rising from the foodstuffs heated on the cooking device (100) are discharged to the outside by means of the exhaust hood (1). After the fan (5) provided in the air suction duct (3) is started by an electric motor, the air rising from the cooking device (100) is sucked and transferred to an air suction duct (3). The sucked air is discharged through the air suction duct (3) connected to a chimney opening to the outside. The air suction duct (3) extends in an upwards direction in the body (2). In other words, the air suction duct (3) extends in the vertical direction above the cooking device (100). The air flow direction (F) is the direction the air suction duct (3) extends. The air flow direction (F) follows the direction from the cooking device (100) towards the exhaust hood (1). The heated air rising from the cooking device (100) is sucked upwards by the fan (5) so as to move in an air flow direction (F) from bottom to top in the air suction duct (3).
-
The fan (5) is disposed into the air suction duct (3). The fan (5) is disposed in the casing (4) in the air suction duct (3).
-
The exhaust hood (1) of the present invention further comprises at least one temperature sensor (6) which is provided on the casing (4) so as to face a direction opposite to the air flow direction (F) and which is suitable for measuring the temperature of the air in the air suction duct (3). The temperature of the heated air is detected by means of the temperature sensor (6). As shown in Figures 3 and 5, the temperature sensor (6) is disposed onto the body (2) so as to face the cooking device (100). Thus, the temperature sensor (6) is positioned on the flow path of the heated and rising air. In other words, the temperature sensor (6) is disposed on the casing (4) so as to enable the heated and rising air to directly reach the temperature sensor (6). Thus, the sensitivity of the temperature sensor (6) to detect the temperature of the rising air is increased. In an embodiment of the present invention, the operating stage of the fan (5) is automatically determined by a control unit according to the data received from the temperature sensor (6).
-
In an embodiment of the present invention, the exhaust hood (1) comprises the temperature sensor (6) disposed on a casing wall (42) which surrounds a casing opening (41) provided on the casing (4) so as to enable air intake into the casing (4). As the fan (5) is operated, the air rises from the cooking device (100) so as to be delivered into the air suction duct (3). The air in the air suction duct (3) enters the casing (4) through the casing opening (41) provided on at least one side of the casing (4). The casing (4) is connected to a chimney opening to the outer environment. The air taken into the casing (4) is discharged to the outer environment by means of said chimney. As shown in Figure 8, a perforated lid may be provided on the casing opening (41). The casing opening (41) is round. The casing wall (42) surrounding the casing opening (41) is provided on the casing (4). The air flow diagrams show that since the air in the air suction duct (3) is sucked towards the casing opening (41) as a result of the operation of the fan (5), it passes over the casing wall (42) and flows towards the casing opening (41). By placing the temperature sensor (6) on the casing wall (42), more air is enabled to pass over the temperature sensor (6). Consequently, a more accurate measurement of the air in the air suction duct (3) is ensured.
-
In an embodiment of the present invention, the exhaust hood (1) comprises at least one temperature sensor (6) which is provided on the casing walls (42) surrounding the casing opening (41) provided on both sides of the casing (4). As shown in Figure 3, the casing opening (41) is provided on both sides of the casing (4). As shown in Figures 3 and 7, in the preferred embodiment of the present invention, the fan (5) is positioned at the center of the air suction duct (3). Thus, the air remaining at the right half of the air suction duct (3) enters the casing (4) through the casing opening (41) provided on the right side of the casing (4). Similarly, the air remaining at the left half of the air suction duct (3) enters the casing (4) through the casing opening (41) provided on the left side of the casing (4). At least one temperature sensor (6) is provided on each casing wall (42). In this case, by means of the temperature sensors (6) provided on the casing walls (42) on the right and left sides of the casing (4), most of the air in the air suction duct (3) is enabled to pass over the temperature sensors (6).
-
In an embodiment of the present invention, the exhaust hood (1) comprises the temperature sensor (6) which is provided in the lower half of the casing (4), facing the cooking device (100). The air flows in the air suction duct (3) in an upwards air flow direction (F) with respect to the cooking device (100). Therefore, the air in the air suction duct (3) first reaches the lower surface of the casing (4), facing the cooking device (100). By placing the temperature sensor (6) in the lower half of the casing (4), facing the cooking device (100), the air flowing in the air flow direction (F) is enabled to pass over the temperature sensor (6) without entering the casing (4) through the casing opening (41).
-
In an embodiment of the present invention, the exhaust hood (1) comprises two temperature sensors (6) which are disposed on the casing (4) symmetrically with respect to a central height axis (X) extending parallel to the air flow direction (F) and passing through the center of the air suction duct (3) so as to divide the air suction duct (3) into two equal halves. As shown in Figure 3, the central height axis (3) is parallel to the upwards direction the air suction duct (3) extends. The air suction duct (3) extends in an upwards direction with respect to the cooking device (100). In other words, the air suction duct (3) extends in a vertical direction. The central height axis (X) passes through the center of the air suction duct (3) so as to divide the air suction duct (3) into two equal halves. The temperature sensors (6) are placed onto the casing (4) symmetrically with respect to the central height axis (X). Thus, the temperature of the air rising from the heated foodstuffs in the right and left burners of the cooking device (100) is enabled to be measured under similar conditions. In a preferred embodiment of the present invention, as shown in Figure 3, the casing (4) is disposed at the center of the air suction duct (3).
-
In an embodiment of the present invention, the exhaust hood (1) comprises a sensor housing (7) which extends on the casing (4) so as to be parallel to the air flow direction (F) and which is suitable for receiving the temperature sensor (6). The sensor housing (7) extends outwards from the plane of the casing (4). The sensor housing (7) extends from the casing (4) towards the cooking device (100). Thus, the temperature sensor (6) is enabled to perform a temperature measurement without being affected by the temperature of the casing (4) body, which heats up due to the temperature of the fan (5) or the electric motor driving the fan (5).
-
In an embodiment of the present invention, the exhaust hood (1) comprises the temperature housing (7) which is provided on the casing wall (42). The sensor housing (7) is disposed on the casing wall (42), on the lower half of the casing wall (42) so as to extend from the casing (4) towards the cooking device (100).
-
In an embodiment of the present invention, the exhaust hood (1) comprises the temperature sensor (6) which is placed into the sensor housing (7) by means of a holder (8). Since the temperature sensor (6) is disposed on the casing (4) by means of a holder (8), a temperature measurement can be performed without being affected by the change in the temperature of the casing (4). The holder (8) is manufactured from a material with low thermal conductivity, which prevents the casing (4) heat from being transferred to the temperature sensor (6). As shown in Figure 8, the holder (8) is manufactured as a two-piece component. After the temperature sensor (6) is placed into the holder (8), the holder (8) is fixed to the sensor housing (7). The holder (8) is placed into the temperature housing (7) by means of a connection member. The connection member can be any mechanical connection member such as a screw.
-
In an embodiment of the present invention, the exhaust hood (1) comprises the holder (8) which is manufactured from plastic material. By means of the holder (8), the temperature sensor (6) does not directly contact the casing (4). At least a part of the holder (8) is positioned between the temperature sensor (6) and the temperature housing (7). Since the thermal conductivity of the plastic material is low, the heat transfer between the temperature sensor (6) and the temperature housing (7) is prevented.
-
In an embodiment of the present invention, the exhaust hood (1) comprises the T-type temperature sensor (6) having a receptor (61) which is suitable for measuring temperature and which is disposed at the end of the temperature sensor (6), and a stem portion (62) which extends towards the receptor (61) and through which at least one electrical cable enabling the energy required to operate the receptor (61) to be delivered to the receptor (61) passes. As shown in Figure 8, the receptor (61) is round. The temperature sensor (6) is disposed on the body (4) such that the receptor (61) extends towards the cooking device (100). In a preferred version of the present invention, the temperature sensor (6) is disposed on the casing (4) such that the receptor (61) extends outwards from the casing (4). Thus, the air flowing in the air flow direction (F) in the air suction duct (3) is enabled to be delivered perpendicularly to the receptor (61). Consequently, the measurement sensitivity and accuracy of the temperature sensor are increased.
-
In an embodiment of the present invention, the exhaust hood (1) comprises the holder (8) which grips the temperature sensor (6) from the stem portion (62) and fixes the temperature sensor (6) on the temperature housing (7) such that the receptor (61) faces the direction opposite to the air flow direction (F). The holder (8) grips the temperature sensor (6) only from the stem portion (62). A part of the stem portion (62) is positioned in the holder (8). Thus, the temperature sensor (6) is fixed on the casing (4) such that the receptor (61) faces the direction opposite to the air flow direction (F) without remaining in the holder (8) or contacting the holder (8). Thus, the receptor (61) which detects the temperature is enabled to measure the temperature of the air without entering into direct heat exchange with the casing (4) and/or the holder (8). Consequently, a more accurate and sensitive detection of the air temperature is provided.
-
By means of the present invention, an exhaust hood (1) is realized, wherein the temperature of the air rising from the cooking device (100) whereon the exhaust hood (1) is operated is measured accurately and precisely by means of the temperature sensor (6) fixed on the casing (2) so as to face a direction opposite to the air flow direction (F).
