Cooking equipment

Abstract

The utility model provides cooking equipment which comprises a machine body, a pumping and draining assembly, an inner container and a door plate, the machine body is provided with a container containing cavity and an air vent, and the air vent is communicated with the container containing cavity and penetrates through the outer side of the machine body; the pumping and discharging assembly comprises a heat discharging piece arranged on the machine body and provided with a heat discharging channel and further comprises a pumping and sucking piece arranged on the heat discharging piece, and the pumping and sucking piece comprises a first air inlet end, a second air inlet end and an air outlet side communicating with the heat discharging channel. The inner container is arranged in the container containing cavity and provided with a cooking cavity, and a cooling air channel communicating with the first air inlet end is formed between the inner wall of the container containing cavity and the outer wall of the inner container. The door plate is connected with the machine body to open and close the cooking cavity. A suction air channel is formed between the door plate and the second air inlet end.

Description

TECHNICAL FIELD

[0001] The utility model relates to life electric appliance technical field especially, a kind of cooking equipment and heat extraction method. BACKGROUND

[0002] There is still residual heat after the use of cooking equipment such as steaming oven, oven, etc., and users have the risk of being scalded. Some cooking equipment currently has an extraction assembly for eliminating residual heat. This type of cooking equipment has the problem of uneven residual heat elimination, and the cooling effect of the body is better than that of the door panel. This problem is particularly evident in cooking equipment with high-temperature self-cleaning function. In high-temperature self-cleaning mode, the temperature in the inner container of the cooking equipment needs to be maintained much higher than the standard boiling point for a long time. During this period, the door panel accumulates a large amount of heat and has an extremely high temperature. The traditional extraction assembly cannot meet the heat dissipation needs of the door panel, and it is possible that the body has a significant and sufficient heat dissipation effect, but the door panel has a weak and limited heat dissipation effect. SUMMARY

[0003] Therefore, the utility model provides a cooking equipment and a heat extraction method to balance the functions of body heat dissipation and door panel heat dissipation, and to achieve the cooling effect.

[0004] The cooking equipment of the utility model includes a body, an extraction assembly, an inner container, and a door panel. The body has a container cavity and an air vent. The air vent communicates with the container cavity and penetrates the outside of the body. The extraction assembly includes a heat dissipation member provided on the body and having a heat dissipation channel, and a suction member provided on the heat dissipation member. The suction member includes a first air inlet end, a second air inlet end, and an air outlet side communicating with the heat dissipation channel. The inner container is provided in the container cavity and has a cooking cavity. A cooling air duct is formed between the inner wall of the container cavity and the outer wall of the inner container and communicates with the first air inlet end. The door panel is connected to the body to open and close the cooking cavity. An air suction duct is formed between the door panel and the second air inlet end.

[0005] Compared with the prior art, the cooking equipment of the utility model has the following advantages:

[0006] 1) It has body heat dissipation and door panel heat dissipation functions and can simultaneously perform body heat dissipation and door panel heat dissipation. When the suction member is operating, low-temperature air on the outside of the body enters the container cavity through the air vent, then flows along the cooling air duct to the first air inlet end and absorbs the heat of the inside of the body and the outer wall of the inner container, and finally is blown into the heat dissipation channel from the air outlet side and discharged to the outside of the body to achieve body heat dissipation. At the same time, high-temperature gas in the cooking cavity flows through the door panel under the suction of the suction member, and then is sucked into the air suction duct to flow to the second air inlet end, and finally is blown into the heat dissipation channel from the air outlet side and discharged to the outside of the body to achieve door panel heat dissipation.

[0007] 2) When the body cooling and the door panel cooling are performed simultaneously, the cooling effects of the body and the door panel can be guaranteed. The low-temperature air and the high-temperature air are respectively sucked into the suction member from the first air inlet end and the second air inlet end, avoiding the low-temperature air and the high-temperature air being sucked into the suction member from the same air inlet position, overcoming the defect that the low-temperature air and the high-temperature air interfere with each other when the suction member simultaneously sucks the low-temperature air and the high-temperature air, helping to reduce the power consumption required when the suction member operates, and being able to prevent one of the low-temperature air and the high-temperature air from hindering the suction member from sucking the other one, avoiding the situation that one of the body cooling and the door panel cooling has a significant cooling effect and dominates, while the cooling effect of the other one is weak.

[0008] In some embodiments, the suction member is arranged between the inner container top wall and the container cavity top wall, the second air inlet end is an end of the suction member relatively close to the inner container top wall, and the suction air duct is located on a side of the inner container top wall opposite to the cooking cavity and extends along the inner container top wall to the door panel.

[0009] In some embodiments, the inner container includes an entrance end provided with a cooking cavity opening, and a heat extraction gap is formed between the door panel and the entrance end, and the heat extraction gap is communicated with the suction air duct and the cooking cavity.

[0010] In some embodiments, the heat extraction assembly further includes a suction flat cover arranged on the inner container top wall and connected to the heat exhaust member, the suction flat cover is provided with a suction air duct, the suction air duct penetrates an end of the suction flat cover relatively close to the door panel, and forms a suction slit extending along the edge of the cooking cavity opening.

[0011] In some embodiments, the cooling air duct is formed between the container cavity side wall and the inner container side wall, the suction member is arranged between the inner container top wall and the container cavity top wall, the first air inlet end is arranged in the container cavity top wall and forms an accumulation air duct, and the accumulation air duct is communicated with the cooling air duct.

[0012] In some embodiments, the air vent is arranged at the bottom of the body, the cooling air duct vertically extends through the bottom of the inner container, and the accumulation air duct is respectively communicated with two ends of the cooling air duct.

[0013] In some embodiments, the heat exhaust member includes a partition member and a volute accommodating the suction member, an inner cavity of the volute is communicated with the heat exhaust channel and is divided into a first cavity and a second cavity by the partition member, the air outlet side includes a first circumferential side located in the first cavity and a second circumferential side located in the second cavity, and the first circumferential side and the second circumferential side are respectively used to blow the air flow from the first air inlet end and the second air inlet end into the heat exhaust channel.

[0014] In some embodiments, the suction member includes a first fan wheel and a second fan wheel coaxially connected, a first circumferential side and a second circumferential side are formed by an outer circumferential side of the first fan wheel and an outer circumferential side of the second fan wheel, and the first air inlet end and the second air inlet end are respectively an air inlet end of the first fan wheel and an air inlet end of the second fan wheel.

[0015] In some embodiments, the suction element is disposed between the top wall of the inner liner and the top wall of the placement cavity, the first air inlet is formed at the end of the first impeller facing away from the second impeller and close to the top wall of the placement cavity, and the second air inlet is formed at the end of the second impeller facing away from the first impeller and close to the top wall of the inner liner.

[0016] In some embodiments, the partition is controlled to be movably disposed within the volute, and the ratio of the volume of the first cavity to the second cavity and the ratio of the air outlet area of ​​the first circumferential side to the second circumferential side change as the partition is controlled to move.

[0017] In some embodiments, the cooking device further includes a control unit, a first temperature measuring element, and a second temperature measuring element. The first temperature measuring element and the second temperature measuring element are used to measure the temperature of the inner chamber and the cooking chamber, respectively. The control unit controls the movement of the partition element based on the temperature of the inner chamber and the temperature of the cooking chamber.

[0018] In some implementations, the ratio of the effective air intake area of ​​the first air intake end to the effective air intake area of ​​the second air intake end is A, and the ratio of the volume of the first cavity to the volume of the second cavity is B.

[0019] The extraction assembly has at least a normal extraction state and a self-cleaning extraction state.

[0020] When the extraction component is in normal extraction state, A = B; when the extraction component is in self-cleaning extraction state, A > B.

[0021] In some embodiments, the extraction assembly further includes an extraction drive for driving the suction member to draw air from the suction duct and the cooling duct, the extraction drive being connected to the suction member at the first air inlet end, where A = 3 / 7. Attached Figure Description

[0022] Figure 1 This is a first top view of a cooking device according to an embodiment of the present invention;

[0023] Figure 2 This is a second top view of a cooking device according to an embodiment of the present invention;

[0024] Figure 3 for Figure 1 A cross-sectional view of the cooking equipment shown, cut along plane AA;

[0025] Figure 4 for Figure 3 A magnified view of a portion of the cooking equipment shown;

[0026] Figure 5 for Figure 2 A cross-sectional view of the cooking equipment shown, cut along plane BB;

[0027] Figure 6 This is an exploded view of a cooking device according to an embodiment of the present invention;

[0028] Figure 7 This is a partial structural diagram of a cooking device according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the exhaust assembly of a cooking device according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the exhaust assembly of a cooking device according to an embodiment of the present invention;

[0031] Figure 10 This is a partial top view of a cooking device according to an embodiment of the present invention;

[0032] Figure 11 for Figure 10 A cross-sectional view of the cooking equipment shown, cut along the C-plane;

[0033] Figure 12 for Figure 11 A magnified view of the cooking equipment shown at point S.

[0034] Explanation of reference numerals in the attached drawings: 10. Body; 11. Chamber; 111. Top wall of chamber; 112. Side wall of chamber; 113. Bottom wall of chamber; 114. Rear shell of chamber; 12. Vent; 13. Exhaust port; 20. Extraction assembly; 21. Heat dissipation component; 211. Volute; 2111. First chamber; 2112. Second chamber; 212. Separator; 213. Heat dissipation cylinder; 2131. Heat dissipation channel; 22. Suction component; 221. First impeller; 2211. 1. Air inlet end; 2212. First circumferential side; 222. Second impeller; 2221. Second air inlet end; 2222. Second circumferential side; 23. Suction flat cover; 231. Suction duct; 232. Suction slit; 24. Suction drive component; 30. Inner liner; 31. Cooking cavity; 32. Cooling duct; 33. Accumulation duct; 34. Inner liner top wall; 35. Inner liner side wall; 36. Inner liner bottom wall; 37. Inner liner rear cover; 38. Inlet end; 40. Door panel; 41. Heat extraction gap. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "or / and" includes any and all combinations of one or more of the associated listed items.

[0037] The cooking equipment provided by the application is not limited in specific type, and the cooking equipment can be an oven range as shown in the drawings, and in other embodiments, the cooking equipment can also be a roaster or a steam oven. The following description of the cooking equipment is based on the oven range, and the description of other types of cooking equipment will not be repeated. It is worth noting that the cooking equipment of the application can have a high-temperature self-cleaning function. Figure 1 and Figure 3 , Figure 2 , Figure 5 and Figure 6 The cooking equipment can be an oven range as shown in the drawings, and in other embodiments, the cooking equipment can also be a roaster or a steam oven. The following description of the cooking equipment is based on the oven range, and the description of other types of cooking equipment will not be repeated. It is worth noting that the cooking equipment of the application can have a high-temperature self-cleaning function.

[0038] The cooking equipment includes a hollow body 10, a heating assembly (not numbered in the drawings) for generating a hot air flow required for heating food, an exhaust assembly 20 for eliminating residual heat after cooking, an inner container 30 for providing a place for placing food to be heated and matured, and a door plate 40 for opening and closing the inner container 30. The exhaust assembly 20 is installed on the body 10, the inner container 30 is placed inside the body 10, and the door plate 40 is movably connected to the body 10 to open and close the inner container 30. The hot air flow generated after the heating assembly is started is blown into the inside of the inner container 30. The exhaust assembly 20 can not only suck low-temperature air from the outside of the body 10 to help the body 10 dissipate heat and cool down, but also can suck high-temperature air from the inner container 30 and eliminate residual heat in the inner container 30 to help the door plate 40 dissipate heat and cool down. After the body 10 and the door plate 40 are cooled down, the user can easily wipe and clean them, and the user will not be scalded by residual heat.

[0039] For the cooking equipment with a high-temperature self-cleaning function, the heating assembly can generate high-temperature air to kill bacteria inside the inner container 30. Compared with the high-temperature air generated by the heating assembly during the conventional cooking function, the high-temperature air generated by the heating assembly during the high-temperature self-cleaning function has a higher temperature. The temperature of the latter can reach 430℃, and the temperature of the former is usually within 100℃-200℃.

[0040] For the convenience of description, the low-temperature air sucked by the exhaust assembly 20 from outside the body 10 to help the body 10 dissipate heat is referred to as low-temperature air, and the high-temperature air sucked by the exhaust assembly 20 from the inner container 30 is referred to as high-temperature air. It can be understood that the low-temperature air is the room temperature air, that is, the air in the kitchen internal environment outside the body 10, and the high-temperature air is the high-temperature air generated by the heating assembly and remaining in the inner container 30 after cooking or high-temperature self-cleaning. The temperature of the low-temperature air is significantly lower than that of the high-temperature air.

[0041] The body 10 has a hollow rectangular cuboid structure, including a cavity top wall 111 and a cavity bottom wall 113 arranged opposite to each other in the vertical direction, two cavity side walls 112 arranged opposite to each other in the horizontal direction, and a cavity rear shell 114 connecting the cavity top wall 111, the cavity bottom wall 113, and the two cavity side walls 112. The cavity top wall 111, the cavity bottom wall 113, the two cavity side walls 112, and the cavity rear shell 114 form a cavity 11, which is used to accommodate the inner container 30. The body 10 surrounds the inner container 30 through the cavity 11 to avoid the user from being scalded by accidentally touching the inner container 30. The opening of the cavity 11 faces away from the cavity rear shell 114. The body 10 is also provided with an air vent 12 communicating the cavity 11 with the outside of the body 10. As shown in Figure 3 、 Figures 5-6 Optionally, the air vent 12 is arranged at the bottom of the body 10. The bottom of the body 10 includes the cavity bottom wall 113 and the part of the cavity side wall 112 and the cavity rear shell 114 close to the cavity bottom wall 113.

[0042] The inner container 30 has a hollow rectangular cuboid structure, including an inner container top wall 34 and an inner container bottom wall 36 arranged opposite to each other in the vertical direction, two inner container side walls 35 arranged opposite to each other in the horizontal direction, and an inner container rear cover 37 connecting the inner container top wall 34, the inner container bottom wall 36, and the two inner container side walls 35. The inner container top wall 34, the inner container bottom wall 36, the two inner container side walls 35, and the inner container rear cover 37 form a cooking cavity 31, which is used to place food materials and serve as a place for the food materials to be heated and matured. There is a spacing space between the outer wall of the inner container 30 and the inner wall of the cavity 11, which communicates with the air vent 12.

[0043] Optionally, the air vent 12 is arranged at the bottom of the body 10. The bottom of the body 10 includes the cavity bottom wall 113 and the part of the cavity side wall 112 and the cavity rear shell 114 close to the cavity bottom wall 113.

[0044] As shown in Figure 3 、 Figure 5 、 Figure 7 and Figure 11As shown, the inner container top wall 34 is spaced adjacent to the inner cavity top wall 111, the inner container bottom wall 36 is spaced adjacent to the inner cavity bottom wall 113, the two inner container side walls 35 are respectively spaced adjacent to the two inner cavity side walls 112, the inner container rear cover 37 is spaced adjacent to the inner cavity rear shell 114, and the inner container 30 forms an entry end 38 at an end opposite to the inner cavity rear shell 114. The cooking cavity 31 penetrates the entry end 38 to form a cooking cavity opening for food to enter and exit the cooking cavity 31. The door panel 40 is rotatably connected to the inner cavity side wall 112 to open or close the cooking cavity opening. When the cooking cavity opening is closed by the door panel 40, the inner side of the door panel 40 and the inner wall of the inner container 30 together form the inner wall of the cooking cavity 31. At this time, the inner side of the door panel 40 is spaced opposite to the inner container rear cover 37. In other embodiments, the door panel 40 can be rotatably connected to the inner cavity side wall 112 or the inner cavity bottom wall 113.

[0045] Further, referring to Figures 3-12 The exhaust assembly 20 is located outside the inner container 30 and is mounted to the body 10. The exhaust assembly 20 includes a heat exhaust member 21, a suction member 22, and an exhaust driving member 24. The heat exhaust member 21 has a heat exhaust passage 2131 that is in communication with the outside of the body 10. The suction member 22 is used to suck low-temperature air from the outside of the body 10 to cool the body 10 and to suck high-temperature air from the inner container 30 to eliminate residual heat in the inner container 30 and cool the door panel 40. The exhaust driving member 24 is connected to the suction member 22 and is used to provide the power required by the suction member 22 to suck the low-temperature air and the high-temperature air. The suction member 22 includes a first air inlet end 2211, a second air inlet end 2221, and an air outlet side. The first air inlet end 2211 is used for the low-temperature air to enter the suction member 22. The second air inlet end 2221 is used for the high-temperature air to enter the suction member 22. The air outlet side is in communication with the heat exhaust passage 2131. The low-temperature air and the high-temperature air sucked by the suction member 22 are all sent to the heat exhaust passage 2131 through the air outlet side and are finally exhausted to the outside of the body 10 by the heat exhaust member 21.

[0046] Specifically, referring to Figure 3 and Figure 5The space between the inner wall of the inner cavity 11 and the outer wall of the inner container 30 forms a cooling air duct 32, the cooling air duct 32 is communicated with the air vent 12 and the first air inlet end 2211, the low-temperature air outside the body 10 is first sucked into the inner cavity 11 from the air vent 12 when the suction member 22 is running, then the low-temperature air flows into the first air inlet end 2211 along the cooling air duct 32, then is blown into the heat exhaust channel 2131 by the suction member 22 through the air outlet side and is finally discharged to the outside of the body 10 by the heat exhaust member 21; the door plate 40 and the second air inlet end 2221 form a suction air duct 231, the high-temperature air in the cooking cavity 31 is accelerated when the suction member 22 is running, then flows through the inner side of the door plate 40 and turns to enter the suction air duct 231, then the high-temperature air flows into the second air inlet end 2221 along the suction air duct 231, and finally is blown into the heat exhaust channel 2131 by the suction member 22 through the air outlet side and is discharged to the outside of the body 10. The low-temperature air flows along the cooling air duct 32 and absorbs the heat of the body 10 in the form of convective heat transfer, the high-temperature air is removed, which reduces the residual heat in the cooking cavity 31, thereby helping to accelerate the cooling of the door plate 40, and the high-temperature air flows through the inner side of the door plate 40, which can also cool the door plate 40 in the form of convective heat transfer.

[0047] In some embodiments, the suction and exhaust assembly 20 is arranged in the inner cavity 11 of the body 10. Referring to Figure 3 、 Figure 5 and Figure 7 , the suction and exhaust assembly 20 is located between the top wall 34 of the inner container and the top wall 111 of the inner cavity, the top wall 111 of the inner cavity is also provided with an exhaust port 13 communicated with the outside of the body 10, the heat exhaust member 21 is connected to the top wall 111 of the inner cavity, and the heat exhaust channel 2131 extends to the top wall 111 of the inner cavity and is communicated with the exhaust port 13. The cooking device further comprises a cooking fume suction device (not shown in the figure) arranged above the body 10, and the low-temperature air and the high-temperature air are all discharged through the exhaust port 13 and are sucked by the cooking fume suction device. Of course, in other embodiments, the cooking device can also not comprise the cooking fume suction device arranged above the body 10.

[0048] Specifically, as Figure 3 、 Figure 5As shown, the heat exhaust member 21, the suction member 22 and the suction-exhaust driving member 24 are all arranged between the cavity top wall 111 and the inner container top wall 34. The suction member 22 comprises a first fan wheel 221 and a second fan wheel 222, which can be centrifugal fan wheels. The end portions of the centrifugal fan wheels are respectively used for air inlet and air outlet. The first air inlet end 2211 and the second air inlet end 2221 are respectively arranged at the end portions of the first fan wheel 221 and the second fan wheel 222. The air outlet side comprises the outer circumferential sides of the first fan wheel 221 and the second fan wheel 222, which are both communicated with the heat exhaust channel 2131. The suction-exhaust driving member 24 is connected with the first fan wheel 221 and the second fan wheel 222 and can drive the first fan wheel 221 and the second fan wheel 222 to rotate simultaneously.

[0049] In this way, the first fan wheel 221 is specifically used for sucking the low-temperature air from outside the machine body 10 and flowing through the cooling air duct 32, and the second fan wheel 222 is specifically used for sucking the residual high-temperature air from inside the cooking cavity 31 and flowing through the suction air duct 231. The low-temperature air and the high-temperature air enter the suction member 22 from different air inlet ends and exit the suction member 22 from different air outlet sides, respectively, so as to ensure that the two air flows can be discharged into the heat exhaust channel 2131 with sufficient kinetic energy, so that the process of sucking and discharging the hot air inside the cooking device is more smooth.

[0050] Optionally, as shown in Figure 4 、 Figures 8-9 、 Figures 11-12 The first fan wheel 221 and the second fan wheel 222 have basically the same structure. Both the first fan wheel 221 and the second fan wheel 222 are conventional centrifugal fan wheels of existing centrifugal fans. The inner portion of the centrifugal fan wheel is communicated with the outer circumferential side of the centrifugal fan wheel through the blade gap located on the circumferential side of the centrifugal fan wheel. The end portion of the centrifugal fan wheel serves as the air inlet end for communicating the inner portion of the centrifugal fan wheel. The first fan wheel 221 and the second fan wheel 222 are arranged in sequence along the vertical direction and coaxially fixedly connected. The first air inlet end 2211 is formed at one end of the first fan wheel 221 relatively far away from the second fan wheel 222, and the second air inlet end 2221 is formed at one end of the second fan wheel 222 relatively far away from the first fan wheel 221. That is, the end of the suction member 22 relatively close to the cavity top wall 111 is the first air inlet end 2211, and the end of the suction member 22 relatively close to the inner container top wall 34 is the second air inlet end 2221. The suction air duct 231 is located on the side of the inner container top wall 34 away from the cooking cavity 31 and close to the cavity top wall 111, and extends along the inner container top wall 34 towards the door panel 40 and the second air inlet end 2221.

[0051] In this way, the first air inlet end 2211 and the second air inlet end 2221 are respectively arranged at two opposite axial ends of the suction member 22, low-temperature air is sucked into the first air wheel 221 through the first air inlet end 2211, and then is blown into the heat exhaust channel 2131 through the air outlet side; high-temperature air is sucked into the second air wheel 222 through the second air inlet end 2221, and then is blown into the heat exhaust channel 2131 through the air outlet side; the flow trajectories of the low-temperature air and the high-temperature air in the suction member 22 are not crossed or combined, so that the two air flows do not interfere with each other, the turbulence of the two air flows caused by mutual interference can be avoided, the suction member 22 can be prevented from being impacted and causing noise, and the stable and low-noise operation of the suction member 22 can be ensured.

[0052] Further, referring to Figure 4 、 Figures 6-12 , the suction assembly 20 further comprises a suction flat cover 23 installed on the inner container top wall 34 near one side of the container cavity top wall 111, the suction flat cover 23 is hollow inside and is formed with a suction air duct 231, the suction member 22 is rotatably arranged relative to the suction flat cover 23, and the heat exhaust member 21 is fixedly connected with the suction flat cover 23. The suction flat cover 23 is provided with an opening hole matched with the second air inlet end 2221 to make the suction air duct 231 communicate with the second air inlet end 2221, the suction air duct 231 penetrates one end of the suction flat cover 23 relative to the door panel 40 to form a suction gap 232, and the suction gap 232 extends along the edge of the cooking cavity opening, specifically, can extend along the edge of the inner container top wall 34 relative to the door panel 40.

[0053] In this way, when the suction member 22 operates, the remaining high-temperature air in the cooking cavity 31 is accelerated to flow into the door panel 40, and then floats upwards along the inner side of the door panel 40 to be sucked into the suction air duct 231 through the suction gap 232, the high-temperature air fully contacts the door panel 40 when flowing along the inner side of the door panel 40, the convection heat transfer area between the high-temperature air and the inner side of the door panel 40 is increased, that is, the area of the inner side of the door panel 40 swept by the high-temperature air is larger, the heat dissipation effect of the door panel 40 is further improved, and the high-temperature air in the cooking cavity 31 can be sucked faster.

[0054] Further, referring to Figure 5 When the door panel 40 closes the cooking cavity opening and the cooking cavity 31 is closed by the inner side of the door panel 40 and the inner wall of the inner container 30 together, the heat extraction gap 41 is formed between the inner side of the door panel 40 and the inlet end 38, and the heat extraction gap 41 communicates the suction gap 232 of the suction air duct 231 and the cooking cavity 31. In this way, the residual high-temperature air flowing along the inner side of the door panel 40 leaves the cooking cavity 31 through the heat extraction gap 41, and then changes the flow direction to flow in the suction air duct 231 along the inner container top wall 34. Both the effective suction of the suction member 22 to the residual high-temperature air in the cooking cavity 31 and the prevention of the high-temperature air from overflowing in the direction away from the inlet end and the door panel 40 to cause the user to be burned can be achieved.

[0055] Further, referring to Figure 3 and Figure 5 , the first wind wheel 221 is one of the two coaxially arranged wind wheels constituting the suction member 22, which is relatively closer to the top wall 111 of the container cavity. The first air inlet end 2211 is arranged opposite to and spaced apart from the side of the top wall 111 of the container cavity facing the top wall 34 of the inner container, so that the accumulation air channel 33 of the cooling air channel 32 is formed between the first air inlet end 2211 and the top wall 111 of the container cavity. One end of the cooling air channel 32 close to the ground is communicated with the air vent 12, and the other end is communicated with the accumulation air channel 33. As shown in Figure 3 , the cooling air channel 32 is formed between the side wall 112 of the container cavity and the side wall 35 of the inner container. After the low-temperature air outside the machine body 10 enters the container cavity 11 through the air vent 12, it first flows vertically upward in the cooling air channel 32 along the side wall 112 of the container cavity and / or the rear shell 114 of the container cavity, then turns and flows horizontally in the accumulation air channel 33 along the top wall 111 of the container cavity, and then is sucked into the first air inlet end 2211. The first air inlet end 2211 is communicated with the accumulation air channel 33, and the low-temperature air can be quickly sucked into the first air inlet end 2211 after reaching the accumulation air channel 33. The flow path of the low-temperature air is schematically shown by a broken line arrow F in Figure 3 .

[0056] In this way, the low-temperature air flowing along the cooling air channel 32 continuously absorbs the heat of the machine body 10, that is, the flow is accompanied by temperature rise and density decrease, so that the low-temperature air can flow upward to the accumulation air channel 33 spontaneously, and the energy consumption required for the suction member 22 to suck the low-temperature air into the first air inlet end 2211 can be reduced.

[0057] Optionally, the air vent 12 is arranged at the bottom of the machine body 10. The bottom of the machine body 10 includes a bottom wall 113 of the container cavity, and a part of the side wall 112 of the container cavity and a part of the rear shell 114 of the container cavity which are relatively close to the bottom wall 113 of the container cavity. The cooling air channel 32 extends in the vertical direction and passes through the bottom of the inner container 30. The bottom of the inner container 30 includes a bottom wall 36 of the inner container, and a part of the side wall 35 of the inner container and a part of the rear cover 37 of the inner container which are relatively close to the bottom wall 36 of the inner container. It can be understood that the greater the vertical distance from the air vent 12 to the top wall 111 of the container cavity, the greater the length of the cooling air channel 32 in the vertical direction, and the longer the flow path of the low-temperature air, the more heat the low-temperature air absorbs from the machine body 10, and the better the cooling effect of the machine body 10.

[0058] Further, referring to Figures 4-5 , Figure 7 and Figure 10The heat exhaust component 21 comprises a partition 212, a volute 211 and a heat exhaust cylinder 213. At least a portion of the partition 212 is arranged in the volute 211 and divides the inner cavity of the volute 211 into a first cavity 2111 and a second cavity 2112. The volute 211 is fixedly installed on the suction flat cover 23 and is used to accommodate the suction component 22 composed of a first wind wheel 221 and a second wind wheel 222. The heat exhaust cylinder 213 is connected to the air outlet of the volute 211 and the top wall 111 of the cavity. A heat exhaust channel 2131 is formed in the heat exhaust cylinder 213. One end of the heat exhaust channel 2131 is connected to the first cavity 2111 and the second cavity 2112, and the other end is connected to the air outlet 13 and thus to the outside of the body 10. The first wind wheel 221 and the second wind wheel 222 are respectively located in the first cavity 2111 and the second cavity 2112. The partition 212 divides the air outlet side into a first circumferential side 2212 located in the first cavity 2111 and a second circumferential side 2222 located in the second cavity 2112.

[0059] Optionally, referring to Figures 8-9 、 Figures 11-12 The partition 212 is a flat piece perpendicular to the axes of the first wind wheel 221 and the second wind wheel 222. The partition 212 is cut by a plane to divide the air outlet side. The first circumferential side 2212 and the second circumferential side 2222 are respectively located on two sides of the plane where the partition 212 is located. The volute 211 is provided with a first opening on the side facing the top wall 111 of the cavity to connect the first cavity 2111 and the accumulated air duct 33. The volute 211 is provided with a second opening on the side facing the top wall 34 of the inner container to connect the second cavity 2112 and the suction air duct 231. The low-temperature air in the accumulated air duct 33 enters the first air inlet end 2211 through the first opening, then passes through the first cavity 2111 and blows off the first wind wheel 221 from the first circumferential side 2212. The high-temperature air in the suction air duct 231 enters the second air inlet end 2221 through the second opening, then passes through the second cavity 2112 and blows off the second wind wheel 222 from the second circumferential side 2222. The low-temperature air and the high-temperature air respectively leave the first wind wheel 221 and the second wind wheel 222 and then converge in the heat exhaust cylinder 213, and finally are discharged along the heat exhaust channel 2131.

[0060] In this way, the partition 212 can block the low-temperature air and the high-temperature air entering the suction component 22, so that the first wind wheel 221 and the second wind wheel 222 can respectively and independently suck the low-temperature air and the high-temperature air while rotating at the same time. This avoids the low-temperature air and the high-temperature air disturbing each other in the suction component 22, ensures that the low-temperature air and the high-temperature air respectively flow out of the suction component 22 from the first circumferential side 2212 and the second circumferential side 2222 with sufficient kinetic energy, and further ensures that the low-temperature air and the high-temperature air still have sufficient flow rate after entering the heat exhaust channel 2131 so as to be smoothly discharged to the outside of the body 10.

[0061] Optionally, the volute 211 further comprises a flange towards the side of the gallbladder placement cavity top wall 111, the flange is arranged at the opening edge of the first opening and extends towards the interior of the volute 211 in a direction away from the gallbladder placement cavity top wall 111, the arrangement of the flange can prevent the backflow of low-temperature air from the accumulation air duct 33 into the first air inlet end 2211.

[0062] Further, referring to Figure 4 、 Figures 7-9 、 Figures 11-12 , the exhaust driving member 24 can be an exhaust driving motor connected with the first air wheel 221 and the second air wheel 222 to rotate coaxially, the exhaust driving member 24 is connected with the suction member 22 at the first air inlet end 2211, that is, the exhaust driving member 24 is arranged at the end of the first air wheel 221 relatively close to the gallbladder placement cavity top wall 111 and relatively far away from the second air wheel 222, thus the exhaust driving member 24 inevitably causes a certain degree of shielding to the first air inlet end 2211. The effective air inlet area of the first air inlet end 2211 is the total area of the first air inlet end 2211 minus the area of the part of the first air inlet end 2211 shielded by the exhaust driving member 24, the ratio of the effective air inlet area of the first air inlet end 2211 to the effective air inlet area of the second air inlet end 2221 is denoted as A, since the second air inlet end 2221 is not shielded, the total area of the second air inlet end 2221 is the effective air inlet area of the second air inlet end 2221, and optionally A=3 / 7.

[0063] The arrangement of the exhaust driving member 24 at the air wheel end to drive the air wheel is a general scheme to drive the centrifugal air wheel to rotate, thus the exhaust driving member 24 inevitably causes shielding to the air wheel end, and the arrangement of the exhaust driving member 24 at the first air inlet end 2211 in the embodiment realizes the maximization of the heat dissipation and cooling effect of the cooking equipment. Since more heat accumulates inside the cooking cavity 31, the heat dissipation and cooling demand of the door plate 40 is greater than that of the machine body 10, and when the cooking equipment has a high-temperature self-cleaning function, it is more important and urgent to dissipate heat and cool the door plate 40. Arranging the exhaust driving member 24 at the first air inlet end 2211 instead of the second air inlet end 2221 can ensure that the priority of the second air wheel 222 to suck high-temperature air from the cooking cavity 31 is higher than the priority of the first air wheel 221 to suck low-temperature air from the cooling air duct 32, and the exhaust driving member 24 will not interfere with the entry of high-temperature air into the second air inlet end 2221.

[0064] Optionally, the cooking device further comprises a control unit, a first temperature measuring element and a second temperature measuring element, the partition 212 is connected to the control unit, the first temperature measuring element and the second temperature measuring element are respectively used to monitor the temperature of the food container cavity 11 and the temperature of the cooking cavity 31, the temperature of the food container cavity and the temperature of the cooking cavity are respectively denoted as Q1 and Q2, the control unit can control the partition 212 to move relative to the volute 211 according to the size relationship change of the temperature of the food container cavity Q1 and the temperature of the cooking cavity Q2, so as to change the volume ratio of the first cavity 2111 and the second cavity 2112, the air outlet area of the first peripheral side 2212 and the air outlet area of the second peripheral side 2222 change with the movement of the partition 212, the ratio of the volume of the first cavity 2111 and the volume of the second cavity 2112 is denoted as B, the ratio of the air outlet area of the first peripheral side 2212 and the air outlet area of the second peripheral side 2222 is denoted as C, B is proportional to C.

[0065] Optionally, the first temperature measuring element and the second temperature measuring element can be respectively arranged in the first cavity 2111 and the second cavity 2112, or can be respectively arranged at the intersection of the heat exhaust channel 2131 and the first cavity 2111 and the intersection of the heat exhaust channel 2131 and the second cavity 2112. In this way, the first temperature measuring element measures the temperature of the low-temperature air as the temperature of the food container cavity, and the second temperature measuring element measures the temperature of the high-temperature air as the temperature of the cooking cavity, without the need to directly place the first temperature measuring element and the second temperature measuring element in the food container cavity 11 and the cooking cavity 31 respectively, which can prevent the first temperature measuring element and the second temperature measuring element from being heated for a long time and thus shortening the service life.

[0066] In an embodiment, the exhaust assembly 20 has at least a normal exhaust state and a self-cleaning exhaust state, the normal exhaust state refers to the working state of the exhaust assembly 20 after the cooking device finishes cooking food, in which the low-temperature air and the high-temperature air are sucked to help the machine body 10 and the inner container 30 to dissipate heat, and the self-cleaning exhaust state refers to the working state of the exhaust assembly 20 after the cooking device finishes high-temperature self-cleaning, in which the low-temperature air and the high-temperature air are sucked to help the machine body 10 and the inner container 30 to dissipate heat. The temperature in the cooking cavity 31 is in the range of 100℃-200℃ when cooking food, and more hot air is generated in the cooking cavity 31 when the high-temperature self-cleaning function is running, which can reach 430℃ during high-temperature self-cleaning. When the exhaust assembly 20 is in the normal exhaust state, the partition 212 moves under the control of the control unit to make A=B, and when the exhaust assembly 20 is in the self-cleaning exhaust state, the partition 212 moves under the control of the control unit to make A>B.

[0067] In this way, the partition 212 can better adapt to the heat dissipation cooling demand of the cooking device in various use states, as a result of the movement of the partition 212 in the volute 211 and the change of the volume ratio of the first cavity 2111 and the second cavity 2112. After cooking, the temperature of the cavity with the pot is close to the temperature of the cooking cavity, and A = B is achieved by the partition 212, so that the low-temperature air and the high-temperature air are sucked into the suction member 22 at an approximate rate, and then the low-temperature air and the high-temperature air are blown into the heat dissipation channel 2131 from the first circumferential side 2212 and the second circumferential side 2222 respectively and smoothly converge in the heat dissipation channel 2131, so as to finally cool the cooking device in the shortest time, and the heat dissipation effects of the machine body and the inner pot are balanced; after the high-temperature self-cleaning is completed, the temperature of the cooking cavity is significantly higher than the temperature of the cavity with the pot, and the urgency of the heat dissipation of the inner pot is higher than the urgency of the heat dissipation of the machine body, A > B is achieved by the partition 212, A is a constant, and A > B is equivalent to reducing B, that is, increasing the volume of the second cavity 2112 and reducing the volume of the first cavity 2111, so that the amount of high-temperature air sucked by the suction member 22 increases, and the power of the suction member 22 can be used more for sucking high-temperature air, so as to improve the priority of the heat dissipation and cooling of the door plate 40 and the cooking cavity 31, help the inner pot 30 cool faster, and finally make the temperature of the cavity with the pot and the temperature of the cooking cavity relatively balanced faster.

[0068] Optionally, the partition 212 comprises a first partition plate and a second partition plate, Figures 8-9 The partition 212 marked in the middle is a first partition plate, which is located at the outer circumferential side of the coaxially connected first wind wheel 221 and second wind wheel 222, and separates the area of the volute 211 cavity outside the suction member 22, and the second partition plate is located inside the suction member 22 and separates the space inside the suction member 22 into two parts. Specifically, the second partition plate is located in the hollow cylindrical region formed by the communication of the hollow region of the first wind wheel 221 and the hollow region of the second wind wheel 222, and divides the hollow cylindrical region into two parts. The first partition plate and the second partition plate are at the same height position in the axial direction of the suction member 22 and are relatively fixed between them, and the control unit can synchronously drive the first partition plate and the second partition plate to move in the axial direction of the first wind wheel 221 and the second wind wheel 222, the first partition plate can prevent the low-temperature air and the high-temperature air respectively leaving the first wind wheel 221 and the second wind wheel 222 from interfering with each other in the volute 211, until the low-temperature air and the high-temperature air respectively enter the heat dissipation channel 2131 from both sides of the first partition plate and converge in the heat dissipation channel 2131, and the second partition plate can prevent the low-temperature air and the high-temperature air entering the inside of the suction member 22 from interfering with each other.

[0069] The following introduces a heat extraction method based on a cooking device, and the cooking device for implementing the method further comprises a control unit, a first temperature measuring member and a second temperature measuring member, and the method comprises the following steps:

[0070] S10, drive the suction member 22 to rotate, so that the suction member 22 draws air from the cooling air duct 32 through the first air inlet end 2211, and the suction member 22 draws air from the suction air duct 231 through the second air inlet end 2221;

[0071] S20, the air drawn by the first air inlet end 2211 through the first peripheral side 2212 is blown into the heat exhaust channel 2131, and the air drawn by the second air inlet end 2221 through the second peripheral side 2222 is blown into the heat exhaust channel 2131;

[0072] S30, monitor the temperature Q1 of the gallbladder cavity and the temperature Q2 of the cooking cavity and obtain ΔQ, ΔQ = |Q1-Q2|;

[0073] ΔQ is the absolute value of the difference between the temperature Q1 of the gallbladder cavity and the temperature Q2 of the cooking cavity, and the preset temperature difference can be determined artificially. If ΔQ is greater than the preset temperature difference, the control of the partition 212 is active and the volume ratio of the first cavity 2111 to the second cavity 2112 is changed until ΔQ is less than or equal to the preset temperature difference.

[0074] Since the cooking cavity 31 is a place where food is heated and matured, the high-temperature air generated by the heating assembly and the high-temperature air generated by the cooking device in the high-temperature self-cleaning working condition are all in the cooking cavity 31, so in most cases, the temperature Q1 of the gallbladder cavity is less than the temperature Q2 of the cooking cavity, and only in a small part of the case, the temperature Q1 of the gallbladder cavity is greater than the temperature Q2 of the cooking cavity.

[0075] The heat extraction method of the utility model can simultaneously realize heat dissipation of the machine body 10 and the door plate 40, and the heat dissipation effect of the machine body 10 and the heat dissipation effect of the door plate 40 can be guaranteed, and the size relationship between ΔQ and the preset temperature difference is used to determine whether the heat dissipation effect of the machine body 10 and the heat dissipation effect of the door plate 40 are balanced, when ΔQ is greater than the preset temperature difference, it can be considered that the heat dissipation effect of the machine body 10 and the heat dissipation effect of the door plate 40 are not balanced, by changing the volume ratio of the first cavity 2111 and the second cavity 2112 to indirectly change the ratio of the power P1 required for the suction member 22 to suck low-temperature air and the power P2 required for the suction member 22 to suck high-temperature air, that is, by adjusting the position of the partition 212 to change the power ratio of the heat dissipation of the machine body 10 and the heat dissipation of the door plate 40, until ΔQ is less than or equal to the preset temperature difference, the heat dissipation effect of the machine body 10 and the heat dissipation effect of the door plate 40 are in a relatively balanced state that can be accepted, and the power of the suction member 22 can be effectively utilized to reduce power waste.

[0076] Among them, step S30 includes the following steps:

[0077] S31, if the temperature Q2 of the cooking cavity is greater than the temperature Q1 of the gallbladder cavity, the partition 212 is controlled to be active in the volute 211 to reduce the volume ratio of the first cavity 2111 to the second cavity 2112;

[0078] S32, if the cooking cavity temperature Q2 < the gallbladder cavity temperature Q1, the control partition 212 in the volute 211 is active to increase the volume ratio of the first cavity 2111 and the second cavity 2112.

[0079] When the cooking cavity temperature Q2 > the gallbladder cavity temperature Q1, it indicates that the heat dissipation effect of the cooking cavity 31 is insufficient at this time, and the suction member 22 is low in the speed of sucking high-temperature air from the cooking cavity 31, so that by reducing the volume ratio of the first cavity 2111 and the second cavity 2112, the volume ratio of the second cavity 2112 to the total volume of the volute 211 is increased, thereby increasing the suction amount and the suction speed of the suction member 22 for sucking high-temperature air from the cooking cavity 31, so as to improve the heat dissipation effect of the cooking cavity 31 and the door plate 40;

[0080] When the cooking cavity temperature Q2 < the gallbladder cavity temperature Q1, it indicates that the heat dissipation effect of the gallbladder cavity 11 is insufficient at this time, and the suction member 22 is low in the speed of sucking low-temperature air from the cooling air duct 32, so that by increasing the volume ratio of the first cavity 2111 and the second cavity 2112, the volume ratio of the first cavity 2111 to the total volume of the volute 211 is increased, thereby increasing the suction amount and the suction speed of the suction member 22 for sucking low-temperature air from the cooling air duct 32, so as to improve the heat dissipation effect of the gallbladder cavity 11 and the machine body 10.

[0081] In this way, the change of the volume ratio of the first cavity 2111 and the second cavity 2112 is adapted to the required suction power ratio of the low-temperature air and the high-temperature air, the volume ratio of the first cavity 2111 and the second cavity 2112 is reduced, and the power of the suction member 22 is more used for sucking high-temperature air, so as to improve the heat dissipation effect of the cooking cavity 31 and the door plate 40, and the volume ratio of the first cavity 2111 and the second cavity 2112 is increased, and the power of the suction member 22 is more used for sucking low-temperature air, so as to improve the heat dissipation effect of the machine body 10.

[0082] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure as long as the combination does not result in contradictions.

[0083] Those skilled in the art should understand that the above embodiments are only used to illustrate the present application, and are not used as a limitation of the present application. Any appropriate changes and variations made to the above embodiments within the spirit and principles of the present application shall fall within the scope of the present application.

Claims

1. A cooking device, characterized in that, include The body (10) has a bladder cavity (11) and a vent (12), the vent (12) being connected to the bladder cavity (11) and penetrating the outer side of the body (10); The exhaust assembly (20) includes an exhaust component (21) having an exhaust channel (2131) and an exhaust component (22) disposed on the exhaust component (21). The exhaust component (22) includes a first air inlet end (2211), a second air inlet end (2221), and an air outlet side communicating with the exhaust channel (2131). The inner liner (30) is disposed in the liner cavity (11) and has a cooking cavity (31). A cooling air duct (32) connecting the first air inlet end (2211) is formed between the inner wall of the liner cavity (11) and the outer wall of the inner liner (30). The door panel (40) is connected to the body (10) for opening and closing the cooking cavity (31), and a suction duct (231) is formed between the door panel (40) and the second air inlet (2221).

2. The cooking apparatus as described in claim 1, characterized in that, The suction component (22) is located between the top wall of the inner liner (34) and the top wall of the inner liner cavity (111). The second air inlet (2221) is the end of the suction component (22) that is relatively close to the top wall of the inner liner (34). The suction duct (231) is located on the side of the top wall of the inner liner (34) opposite to the cooking cavity (31) and extends along the top wall of the inner liner (34) toward the door panel (40).

3. The cooking apparatus as described in claim 2, characterized in that, The inner liner (30) includes an inlet end (38) with an opening for a cooking cavity (31). A heat extraction gap (41) is formed between the door panel (40) and the inlet end (38). The heat extraction gap (41) connects the suction duct (231) and the cooking cavity (31).

4. The cooking apparatus as described in claim 2, characterized in that, The exhaust assembly (20) also includes a suction flat cover (23) disposed on the top wall (34) of the inner liner and connected to the heat exhaust component (21). The suction flat cover (23) has the suction air duct (231) provided. The suction air duct (231) passes through one end of the suction flat cover (23) that is relatively close to the door panel (40) and forms a suction slit (232) extending along the edge of the opening of the cooking cavity (31).

5. The cooking apparatus as described in claim 1, characterized in that, The cooling air duct (32) is formed between the side wall (112) of the bladder cavity and the side wall (35) of the inner bladder cavity. The suction member (22) is disposed between the top wall (34) of the inner bladder cavity and the top wall (111) of the bladder cavity cavity. The first air inlet (2211) is spaced apart from the top wall (111) of the bladder cavity cavity and forms an accumulation air duct (33). The accumulation air duct (33) is connected to the cooling air duct (32).

6. The cooking apparatus as described in claim 5, characterized in that, The vent (12) is located at the bottom of the body (10), the cooling air duct (32) extends vertically and passes through the bottom of the inner liner (30), and the accumulation air duct (33) and the vent (12) are respectively connected to the two ends of the cooling air duct (32).

7. The cooking apparatus as described in claim 1, characterized in that, The heat dissipation component (21) includes a separator (212) and a volute (211) that houses the suction component (22). The inner cavity of the volute (211) is connected to the heat dissipation channel (2131) and is divided into a first cavity (2111) and a second cavity (2112) by the separator (212). The air outlet side includes a first peripheral side (2212) located in the first cavity (2111) and a second peripheral side (2222) located in the second cavity (2112). The first peripheral side (2212) and the second peripheral side (2222) respectively blow airflow from the first air inlet (2211) and the second air inlet (2221) into the heat dissipation channel (2131).

8. The cooking apparatus as described in claim 7, characterized in that, The suction component (22) includes a first impeller (221) and a second impeller (222) coaxially connected. The outer peripheral side of the first impeller (221) and the outer peripheral side of the second impeller (222) form the first peripheral side (2212) and the second peripheral side (2222). The first air inlet end (2211) and the second air inlet end (2221) are the air inlet end of the first impeller (221) and the air inlet end of the second impeller (222), respectively.

9. The cooking apparatus as described in claim 8, characterized in that, The suction member (22) is disposed between the top wall of the inner liner (34) and the top wall of the liner cavity (111). The first air inlet (2211) is formed at the end of the first impeller (221) facing away from the second impeller (222) and close to the top wall of the liner cavity (111). The second air inlet (2221) is formed at the end of the second impeller (222) facing away from the first impeller (221) and close to the top wall of the inner liner (34).

10. The cooking apparatus as described in claim 7, characterized in that, The separator (212) is controllably and movably disposed within the volute (211), and the ratio of the volume of the first cavity (2111) to the volume of the second cavity (2112) and the ratio of the air outlet area of ​​the first peripheral side (2212) to the second peripheral side (2222) change as the separator (212) is controlled to move.

11. The cooking apparatus as described in claim 10, characterized in that, The cooking device also includes a control unit, a first temperature measuring element and a second temperature measuring element. The first temperature measuring element and the second temperature measuring element are used to measure the temperature of the inner chamber (11) and the cooking chamber (31) respectively. The control unit controls the movement of the separator (212) according to the temperature of the inner chamber (11) and the temperature of the cooking chamber (31).

12. The cooking apparatus as described in claim 7, characterized in that, The ratio of the effective air intake area of ​​the first air intake end (2211) to the effective air intake area of ​​the second air intake end (2221) is A, and the ratio of the volume of the first cavity (2111) to the volume of the second cavity (2112) is B. The extraction component (20) has at least a normal extraction state and a self-cleaning extraction state. When the extraction component (20) is in the normal extraction state, A = B; when the extraction component (20) is in the self-cleaning extraction state, A > B.

13. The cooking apparatus as described in claim 12, characterized in that, The extraction assembly (20) further includes an extraction drive (24) for driving the suction member (22) to draw air from the suction duct (231) and the cooling duct (32), the extraction drive (24) being connected to the suction member (22) at the first air inlet end (2211), A = 3 / 7.

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