CN216557225U - Cooking utensil - Google Patents

Abstract

The present invention provides a cooking appliance, comprising: drain pan, load panel, heat abstractor and waterproof, the drain pan with load panel encloses to close and forms the holding chamber, heat abstractor is located the holding intracavity, waterproof includes: the mounting rod and with the apron that mounting rod one end links to each other, the vent has been seted up on the drain pan, the mounting hole has in the vent, the flexible setting of mounting rod is in the mounting hole, the apron is located the drain pan outside, the apron is used for hiding the vent. The cooking utensil provided by the embodiment of the utility model can prevent water stains and dirt from entering the induction cooker from the ventilation opening when the cooking utensil is cleaned, and prevent electronic components in the induction cooker from being burnt.

Description

Cooking utensil

Technical Field

The utility model relates to the technical field of household appliances, in particular to a cooking appliance.

Background

The induction cooker is a product of modern kitchen revolution, and can directly generate heat at the bottom of a boiler without open fire or conduction heating, so that the heat efficiency is greatly improved. The induction cooker has no oil smoke, is movable, convenient and quick, and becomes a necessary product for modern family kitchens. When the electromagnetic wire coil is used, alternating current is introduced into the electromagnetic wire coil, 220V alternating current is rectified into direct current through a rectifying element (such as a silicon rectifier), a high-frequency magnetic field is generated in the electromagnetic wire coil through LC resonance, an iron pan is used for cutting alternating magnetic lines of force, and a large amount of eddy current is generated in the pan bottom so as to generate heat required by cooking.

The inside of the induction cooker has a complex circuit design, and a coil panel, a main control panel and a display panel of the induction cooker are all provided with a large number of electronic components which need good waterproof protection. Meanwhile, when a part of electronic components in the induction cooker work, the heating value is large, and the induction cooker needs to be cooled by a fan, so that an air port is generally arranged on the induction cooker to realize the cooling of the interior of the induction cooker.

However, when a user cleans and cleans the induction cooker, water and dirt easily enter the induction cooker from the air opening, and electronic components inside the induction cooker are burnt.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cooking utensil, which can prevent water stains and dirt from entering the inside of an induction cooker from a vent when the cooking utensil is cleaned, and prevent electronic components inside the induction cooker from being burnt.

An embodiment of the present invention provides a cooking appliance, including: drain pan, load panel, heat abstractor and waterproof piece.

The drain pan with bear the weight of the panel and enclose and close and form the holding chamber, heat abstractor is located the holding intracavity, waterproof includes: the mounting rod and with the apron that mounting rod one end links to each other, the vent has been seted up on the drain pan, the mounting hole has in the vent, the flexible setting of mounting rod is in the mounting hole, the apron is located the drain pan outside, the apron is used for hiding the vent.

According to the cooking utensil provided by the embodiment of the utility model, the waterproof piece is arranged at the vent in a telescopic manner, when the cooking utensil is in a working state, the waterproof piece is in an open state through the telescopic manner of the mounting rod in the mounting hole, and the vent can be freely ventilated. When cooking utensil is in the non-operating condition, through the flexible of installation pole in the mounting hole, make waterproof part be the closed condition, at this moment, the apron covers the vent, when the user washs cooking utensil and cleans, because the effect of sheltering from of apron, inside water stain and filth can not get into the organism, prevent cooking utensil's electronic components phenomenon's emergence of burning out. In addition, when cooking utensil is in operating condition, the apron also can play certain effect of sheltering from, prevents that water stain from spilling into inside the organism from the vent.

In a possible embodiment, the flashing further comprises: and limiting and stopping.

The limiting stop is connected with one end, far away from the cover plate, of the mounting rod, the limiting stop is located in the containing cavity, and the outer diameter of the limiting stop is larger than the inner diameter of the mounting hole.

The waterproof piece can be prevented from being separated from the mounting hole in the telescopic process through the limiting stop piece.

In one possible embodiment, the outer diameter of the mounting rod is smaller than the inner diameter of the mounting hole.

When the user washs the one side of seting up the vent to cooking utensil and cleans, with the cooking utensil upset, the one side that makes to set up the vent up, because the action of gravity and the external diameter of installation pole is less than the internal diameter of mounting hole, the apron is automatic closed on the vent, prevents that water stain and filth from getting into inside the organism.

In a possible embodiment, the ventilation opening is provided on the bottom surface of the bottom shell.

Is opened on the bottom surface of the bottom shell through the vent, when the cooking utensil works normally, the cooking utensil is normally placed due to the outer diameter W of the mounting rod₂The wind energy smoothly passes through the ventilation opening and sucks cold air outside the cooking utensil into the machine by the heat dissipation device to dissipate heat for the heating element inside the machine, or the wind energy smoothly sends hot air inside the machine out of the machine body through the ventilation opening. When the cooking utensil does not work, a user cleans and wipes the cooking utensil, turns over the cooking utensil with the bottom surface upward, and installs the mounting rod with the outer diameter W₂Less than the internal diameter of mounting hole, through the action of gravity, waterproof spare self-closing prevents that water stain and filth from getting into the organism from the vent inside, arouses electronic components's burnout. The waterproof part is assembled atOn the bottom surface of the bottom shell, the waterproof part becomes an automatic opening and closing device, and the structure is simple and the installation is convenient.

In one possible embodiment, the cooking appliance further comprises: and the separation plate is positioned in the ventilation opening and connected with the bottom shell.

The partition board is provided with the mounting hole and the ventilation hole and is used for separating the inside and the outside of the accommodating cavity.

Prevent through the division board that large-scale object from getting into inside cooking utensil that leads to of organism and can not normally work, for example, can prevent that large-scale object from getting into the holding chamber, lead to fan stall or card commentaries on classics etc..

In a possible embodiment, the separation plate is in a shape of gathering at the center, and the center of the separation plate protrudes out of the bottom shell.

Therefore, even if the cooking utensil works, water stains splash into the machine body from the vent holes, the water stains can flow downwards along the downward inclined surface of the isolation plate, and then flow out of the machine body from the vent holes or the mounting holes.

In a possible embodiment, the mounting hole is located at the center of the isolation plate, and the mounting rod is connected with the center of the cover plate.

Therefore, the integral attractiveness of the cooking appliance can be optimized, and the installation stability of the waterproof part can be improved.

In one possible embodiment, the cooking appliance further comprises: a buffer. The buffer member is located outside the bottom case, and the buffer member surrounds the vent hole.

Through the bolster, when the waterproof part was closed, the bolster can have the cushioning effect to the waterproof part, prevents that scratch, sunken or damage from appearing in the drain pan.

In one possible embodiment, the flashing is made of one or more of plastic, silicone and metal.

In one possible embodiment, the ventilation opening is an air inlet and/or an air outlet.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic internal structure diagram of a cooking appliance according to an embodiment of the present invention;

fig. 2 is an exploded view of a heat sink, a bottom case and a waterproof member of a cooking appliance according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a waterproof member of a cooking appliance according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view illustrating a waterproof member of a cooking appliance according to an embodiment of the present invention;

fig. 5 is a schematic view illustrating an operation principle of a waterproof member of a cooking appliance according to an embodiment of the present invention;

fig. 6 is a schematic view illustrating another operation principle of a waterproof member of a cooking appliance according to an embodiment of the present invention;

fig. 7 is a partial structural view of a vent of a cooking appliance according to an embodiment of the present invention.

Description of reference numerals:

100-a cooking appliance;

10-a bottom shell;

11-a vent;

20-a heat sink;

30-an accommodating cavity;

40-a coil disk;

50-a circuit board;

60-a power line;

70-a waterproof member;

71-a mounting bar;

72-a cover plate;

73-limit stop;

80-a separation plate;

81-mounting holes;

82-Vent hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In this application, the cooking appliance may be a series of kitchen appliances such as an induction cooker and a ceramic cooker, which require heat dissipation from the inside of the body.

The cooking utensil in the embodiment of the utility model is further explained by taking an induction cooker as an example.

The principle of the electromagnetic oven is an electromagnetic induction phenomenon, namely, alternating current is utilized to generate an alternating magnetic field with the direction changing constantly through a coil, the interior of a conductor in the alternating magnetic field can generate vortex current, the vortex current is caused by the fact that a vortex electric field pushes current carriers in the conductor to move, and the conductor is heated by the Joule heat effect of the vortex current, so that heating is realized.

The electromagnetic oven is internally provided with a large number of electronic components to form a required circuit design, the electronic components need good waterproof protection, and part of the electronic components generate a large amount of heat during working and need to be cooled by a fan, so that an air port is generally arranged on a shell of the electromagnetic oven to realize the cooling inside the electromagnetic oven.

However, in the related art, the air opening of the induction cooker has no waterproof structure, and when a user cleans the induction cooker with a cleaning cloth, water stains and dirt easily enter the charged body inside the induction cooker from the air opening, so that the burning-out phenomenon is caused.

In view of this, in the cooking appliance provided in the embodiment of the present invention, the waterproof member is disposed at the vent of the bottom case of the cooking appliance, and the waterproof member is telescopically disposed at the vent. When the cooking utensil works and the ventilation opening needs ventilation, the waterproof piece is in an open state; when cooking utensil is out of work, the vent need not ventilate, and the user washs cooking utensil and cleans the time, and waterproof spare is for the closed condition in order to cover the vent, avoids inside water stain and filth entering cooking utensil, prevents the inside electronic components of cooking utensil and burns out the emergence of phenomenon.

A cooking appliance provided by an embodiment of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of an internal structure of a cooking appliance 100 according to an embodiment of the present invention, and referring to fig. 1, the cooking appliance 100 according to the embodiment of the present invention includes: a bottom case 10, a carrier panel (not shown), and a heat sink 20.

The bottom shell 10 has an opening at the upper end, the bearing panel is erected at the opening, the bottom shell 10 and the bearing panel enclose to form an accommodating cavity 30, and the heat dissipation device 20 (such as a fan) is disposed in the accommodating cavity 30.

Of course, the external structure of the cooking utensil 100 provided by the embodiment of the present invention is not limited to the above example, and in other embodiments of the present invention, the cooking utensil 100 may further include an upper cover, and the upper cover is erected on the upper end opening of the bottom shell 10, and then the bearing panel is further disposed on the upper cover.

When the cooking appliance 100 is an induction cooker, the coil panel 40 and the circuit board 50 are further disposed in the accommodating chamber 30, and the coil panel 40 serves as a heating device to heat the induction cooker. The heat sink 20 can dissipate heat from the coil panel 40 and the circuit board 50, thereby preventing the cooking utensil 100 from being burnt by high temperature inside the machine body. The coil panel 40 and the heat sink 20 are respectively connected to a circuit board 50, the circuit board 50 provides power and controls for the coil panel 40 and the heat sink 20, and the circuit board 50 is connected to an external power source through a power line 60.

Of course, the cooking appliance 100 according to the embodiment of the present invention is not limited thereto, fig. 2 is an exploded structural schematic view of the heat dissipation device 20, the bottom case 10 and the waterproof member 70 of the cooking appliance 100 according to the embodiment of the present invention, and fig. 3 is a structural schematic view of the waterproof member 70 of the cooking appliance 100 according to the embodiment of the present invention.

As shown in fig. 2 and 3, the cooking appliance 100 according to the embodiment of the present invention further includes: flashing 70, flashing 70 comprising: a mounting rod 71, and a cover plate 72 connected to one end of the mounting rod 71. Flashing 70 may be made of one or more of plastic, silicone, and metal.

Wherein, the bottom case 10 of the cooking utensil 100 is provided with a vent 11, the waterproof member 70 is disposed at the vent 11, and the vent 11 may be an air inlet and/or an air outlet, that is, the vent 11 may be an air inlet, an air outlet, an air inlet and an air outlet. In the drawings provided by the embodiments of the present invention, the air inlet is a hole, the heat dissipation device 20 is disposed at the air inlet, and the air outlet is a plurality of strip-shaped gaps formed on the side of the bottom case 10, so the waterproof member 70 is disposed only at the air inlet.

It should be understood that if the air inlet is a plurality of strip-shaped gaps formed on the bottom case 10, the waterproof member 70 is inconvenient to cover the air inlet, and the air outlet is a hole, then the waterproof member 70 may be only disposed at the air outlet. Similarly, when the air inlet and the air outlet are both holes, the waterproof member 70 can cover both the air inlet and the air outlet, and the waterproof member 70 is arranged at the air inlet and the air outlet.

Wherein, the vent 11 has a mounting hole 81 therein, the mounting rod 71 in the waterproof member 70 is telescopically disposed in the mounting hole 81, and the cover plate 72 is located outside the bottom case 10, and the cover plate 72 can cover the vent 11 by the telescopic arrangement of the mounting rod 71 in the mounting hole 81.

It should be understood that, when the cooking utensil 100 provided by the embodiment of the present invention is in the operating state, the waterproof member 70 is in the open state by the extension and contraction of the mounting rod 71 in the mounting hole 81, and the ventilation opening 11 can be freely ventilated. When cooking utensil 100 is in the off-working condition, through the flexible of installation pole 71 in mounting hole 81, make waterproof piece 70 be the closed condition, at this moment, the apron 72 covers vent 11, when the user washs cooking utensil 100 and wipes, because the effect of sheltering from of apron 72, inside water stain and filth can not get into the organism, prevent the emergence of cooking utensil 100's electronic components phenomenon of burning out. In addition, when the cooking utensil 100 is in an operating state, the cover plate 72 can also play a certain shielding role to prevent water stains from splashing into the machine body from the ventilation opening 11.

It should be noted that, in the cooking appliance 100 provided in the embodiment of the present invention, the ventilation opening 11 may be disposed at any position of the bottom case 10, for example, on the bottom surface of the bottom case 10 or on the side surface of the bottom case 10, and the embodiment of the present invention is described by taking the ventilation opening 11 as an example on the bottom surface of the bottom surface.

It should be understood that the cover plate 72 is illustrated as circular in the drawings of the present invention because the vent 11 is generally circular hole-shaped, the cover plate 72 should change with the shape of the vent when the vent 11 is other shapes, and the area of the cover plate 72 should be larger than that of the vent 11.

Fig. 4 is a schematic cross-sectional structural view of a waterproof member 70 of a cooking appliance 100 according to an embodiment of the present invention, and in combination with fig. 2 to 4, in the embodiment of the present invention, the waterproof member 70 further includes: the limit stopper 73 is connected with one end, far away from the cover plate 72, of the mounting rod 71, after the cooking utensil 100 is assembled, the limit stopper 73 is located in the accommodating cavity 30, and the outer diameter W of the limit stopper 73₁Is larger than the inner diameter of the mounting hole 81. The limit stopper 73 prevents the waterproof member 70 from being separated from the mounting hole 81 during the expansion and contraction process.

With continued reference to FIGS. 2 and 4, in some embodiments of the utility model, the outer diameter W of the mounting rod 71 may also be configured₂Smaller than the inner diameter of the mounting hole 81. When the user cleans and wipes the surface of the cooking appliance 100 with the vent 11, the cooking appliance 100 is turned over, the surface with the vent 11 faces upwards, and the cover plate 72 is automatically closed on the vent 11 under the action of gravity, so that water stains and dirt are prevented from entering the machine body.

Fig. 5 is a schematic view illustrating an operation principle of the waterproof member 70 of the cooking appliance 100 according to an embodiment of the present invention, and fig. 6 is a schematic view illustrating another operation principle of the waterproof member 70 of the cooking appliance 100 according to an embodiment of the present invention. Referring to fig. 5 and 6, in some embodiments of the present invention, the ventilation opening 11 is formed on the bottom surface of the bottom case 10, and the waterproof member 70 is correspondingly formed on the bottom of the bottom case 10.

When the cooking appliance 100 is normally operated, the cooking appliance 100 is normally placed due to the outer diameter W of the mounting rod 71₂Smaller than the inner diameter of the mounting hole 81, the waterproof member 70 is automatically opened by gravity, and wind energy smoothly passes through the ventilation opening 11 and is absorbed into the machine by the heat dissipation device 20 to dissipate heat for the heating element inside the machine, or wind energy smoothly passes through the ventilation opening 11 to send hot air inside the machine out of the machine (as shown in fig. 5).

When cooking utensil 100 is not in operation, the user cleans cooking utensil 100 by wiping, turns cooking utensil 100 upside down with its bottom surface facing upward due to outer diameter W of mounting rod 71₂Smaller than the inner diameter of the mounting hole 81, the waterproof member 70 is automatically closed by gravity, so as to prevent water and dirt from entering the inside of the housing through the vent 11, and burning out the electronic components (as shown in fig. 6).

Thus, the waterproof member 70 is assembled on the bottom surface of the bottom case 10, so that the waterproof member 70 becomes an automatic opening and closing device, and has a simple structure and is convenient to install.

In order to prevent bottom case 10 from being scratched, dented or broken due to impact force of waterproof member 70 on bottom case 10 during closing, in some embodiments of the present invention, cooking appliance 100 may further include: a buffer member (not shown) disposed outside bottom case 10 and surrounding vent 11, and configured to buffer waterproof member 70 when waterproof member 70 is closed, so as to prevent bottom case 10 from being scratched, dented or damaged. The buffer member may be made of a material having a soft texture such as rubber.

Fig. 7 is a partial structural view of the cooking appliance 100 according to an embodiment of the present invention at the vent 11. Referring to fig. 7, in some embodiments of the present invention, the cooking appliance 100 further includes: and a partition plate 80 positioned in the ventilation opening 11 and connected to the bottom case 10.

The isolation plate 80 is provided with a mounting hole 81 and a plurality of vent holes 82, and the number of the vent holes 82 may be one or more, for example, as shown in fig. 7, the plurality of vent holes 82 are radial from the center of the isolation plate 80. The radial ventilation holes 82 can increase ventilation quantity on the one hand, and can reduce the width of the ventilation holes 82 on the other hand, so that water stains are prevented from being splashed into the machine body, or a large object is placed to enter the machine body, so that the cooking appliance 100 cannot work normally.

The separation plate 80 is used for separating the inside and the outside of the accommodating chamber 30, and the large object can be prevented from entering the inside of the machine body through the separation plate 80, so that the cooking appliance 100 cannot work normally, for example, the large object can be prevented from entering the accommodating chamber 30, so that the blower is blocked or locked.

The isolation plate 80 may be a detachable member or may be integrally formed with the bottom case 10. In this application, "integrally formed" means that two or more components are connected by injection molding or stamping to form a unitary structure without the need for additional connecting means.

With continued reference to fig. 7, in some embodiments of the present invention, the separation plate 80 may be centrally gathered, and the center of the separation plate 80 protrudes toward the outside of the bottom case 10. Thus, even if water stains are splashed into the interior of the body from the vent holes 82 during operation of the cooking appliance 100, the water stains flow down along the downward inclined surface of the partition plate 80 and flow out of the body from the vent holes 82 or the mounting holes 81.

For the overall aesthetic appearance of the cooking appliance 100 and the installation stability of the waterproof member 70, in some embodiments of the present invention, the installation hole 81 may be opened at the center of the partition plate 80, and the installation rod 71 is connected with the center of the cover plate 72.

In summary, according to the cooking apparatus 100 of the present invention, the waterproof member 70 may be disposed at the bottom of the bottom case 10, and the waterproof member 70 may be automatically opened and closed by gravity. When the cooking utensil 100 is placed on the front side for work, the waterproof piece 70 is automatically opened, and wind energy smoothly sucks cold air outside the cooking utensil 100 into the machine body through the heat dissipation device 20 to dissipate heat of heating components inside the machine body. When cooking utensil 100 was out of work, when the user overturned the back and washd with the rag, waterproof piece 70 self-closing avoided inside water stain and the filth got into the organism from vent 11, prevented that electronic components from burning out in the organism. And the principle and the structure are simple and easy to implement, and the installation is convenient.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.

In the description of the present invention, it should be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral to one another; either directly or indirectly through intervening media, may be used in either the internal or the external relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A cooking appliance, comprising: a bottom shell (10), a bearing panel, a heat dissipation device (20) and a waterproof piece (70);

the bottom shell (10) and the bearing panel enclose to form an accommodating cavity (30), and the heat dissipation device (20) is positioned in the accommodating cavity (30);

the flashing (70) comprises: the mounting structure comprises a mounting rod (71) and a cover plate (72) connected with one end of the mounting rod (71);

the ventilating opening (11) is formed in the bottom shell (10), the mounting hole (81) is formed in the ventilating opening (11), the mounting rod (71) is arranged in the mounting hole (81) in a telescopic mode, the cover plate (72) is located on the outer side of the bottom shell (10), and the cover plate (72) is used for covering the ventilating opening (11).

2. The cooking appliance according to claim 1, wherein the waterproof member (70) further comprises: a limit stop (73);

the limiting stop block (73) is connected with one end, far away from the cover plate (72), of the mounting rod (71), the limiting stop block (73) is located in the accommodating cavity (30), and the outer diameter of the limiting stop block (73) is larger than the inner diameter of the mounting hole (81).

3. The cooking appliance according to claim 2, wherein the mounting rod (71) has an outer diameter smaller than an inner diameter of the mounting hole (81).

4. Cooking appliance according to any one of claims 1 to 3, characterized in that said ventilation opening (11) opens on the bottom surface of said bottom shell (10).

5. The cooking appliance according to any one of claims 1 to 3, further comprising: a partition plate (80) located in the ventilation opening (11) and connected to the bottom case (10);

the isolation plate (80) is provided with the mounting hole (81) and the ventilation hole (82), and the isolation plate (80) is used for separating the inside and the outside of the accommodating cavity (30).

6. The cooking appliance according to claim 5, wherein the separation plate (80) is centrally gathered, and the center of the separation plate (80) is protruded outward of the bottom case (10).

7. The cooking appliance according to claim 6, wherein the mounting hole (81) is located at the center of the separation plate (80), and the mounting rod (71) is connected with the center of the cover plate (72).

8. The cooking appliance according to any one of claims 1 to 3, further comprising: a buffer member;

the buffer member is located outside the bottom case (10), and the buffer member is arranged around the ventilation opening (11).

9. The cooking appliance according to any one of claims 1 to 3, wherein the waterproof member (70) is made of one or more of plastic, silicone and metal.

10. Cooking appliance according to any of claims 1 to 3, wherein the ventilation opening (11) is an air inlet and/or an air outlet.

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