Heater and disinfection cabinet

Abstract

The utility model relates to the technical field of household appliances, in particular to a heater and a disinfection cabinet, a wind shield for mounting a heating mechanism is arranged on a ventilation cavity, the ventilation cavity is divided into a first ventilation cavity and a second ventilation cavity by the wind shield, and a ventilation opening is formed in the wind shield, so that the air quantity of the first ventilation cavity and the second ventilation cavity can be balanced; the problems that a heater in the disinfection cabinet is provided with a wind shield so as to install a heating mechanism, the heater is divided into two sides by the wind shield, due to the air outlet principle of a fan, the air volume on one side of the heater is large, the air volume on the other side of the heater is small, a temperature controller in the heater is located on the side with the small air volume, and the heat dissipation effect of the temperature controller is greatly influenced are effectively solved. The temperature controller is in a high-temperature environment for a long time, and a protection mechanism is frequently triggered due to overheating, so that the normal operation of the disinfection cabinet is influenced, and the service life of equipment is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a heater and a disinfection cabinet. Background Art

[0002] Disinfection cabinets, as essential household appliances in modern kitchens, focus on bringing higher hygiene standards to family life. Disinfection cabinets cleverly use a variety of disinfection methods such as high temperature, ultraviolet rays and ozone to conduct comprehensive and in-depth disinfection and sterilization of tableware, kitchen utensils and even other daily necessities. This process effectively eliminates harmful microorganisms such as bacteria, viruses and fungi, greatly reduces the risk of food contamination during preparation, and builds a solid health defense line for every family member. The popularity of disinfection cabinets not only reflects modern people's pursuit of quality of life, but also reflects meticulous care for the health of their families.

[0003] The heater in the existing disinfection cabinet is provided with a wind shield to install the heating mechanism. The heater is divided into two sides by the wind shield. Due to the air outlet principle of the fan, the air volume on one side of the heater is larger, and the air volume on the other side is smaller. The thermostat in the heater is located on the side with smaller air volume, which greatly affects the heat dissipation effect of the thermostat. The thermostat is in a high temperature environment for a long time and is prone to frequently triggering the protection mechanism due to overheating, which not only affects the normal operation of the disinfection cabinet, but also shortens the service life of the equipment.

[0004] The utility model is proposed in view of the deficiencies in the prior art. Utility Model Content

[0005] In view of the heater in the above-mentioned existing disinfection cabinet, a windshield is provided to install the heating mechanism, and the heater is divided into two sides by the windshield. Due to the air outlet principle of the fan, the air volume on one side of the heater is larger, and the air volume on the other side is smaller. The thermostat in the heater is located on the side with smaller air volume, which greatly affects the heat dissipation effect of the thermostat. The thermostat is in a high temperature environment for a long time, and the protection mechanism is easily triggered frequently due to overheating, which not only affects the normal operation of the disinfection cabinet, but also shortens the service life of the equipment. The technical solution adopted by the utility model to solve the technical problem is:

[0006] A heater comprises a device body, the device body comprising a ventilation cavity, a heating mechanism located on the ventilation cavity, a temperature controller located on the ventilation cavity and electrically connected to the heating mechanism, and a fan assembly located on one side of the ventilation cavity, the ventilation cavity being provided with a windshield plate for installing the heating mechanism, the ventilation cavity being divided into a first ventilation cavity and a second ventilation cavity by the windshield plate, and the windshield plate being provided with a ventilating opening connecting the first ventilation cavity and the second ventilation cavity.

[0007] Furthermore, the device body includes a fuse located on the first ventilation cavity, and the thermostat is located in the second ventilation cavity.

[0008] Furthermore, the wind shield includes a first wind shield arranged along the vertical direction and a second wind shield arranged along the horizontal direction, and both the first wind shield and the second wind shield are provided with mounting grooves for mounting the heating mechanism.

[0009] Furthermore, the second ventilation cavity is divided into a second upper ventilation cavity and a second lower ventilation cavity below the second upper ventilation cavity by the second wind shield, and the first ventilation cavity is divided into a first upper ventilation cavity communicating with the second upper ventilation cavity and a first lower ventilation cavity below the first upper ventilation cavity and communicating with the second lower ventilation cavity by the second wind shield.

[0010] Furthermore, the vents include a first vent for connecting the first upper ventilation cavity and the second upper ventilation cavity and located close to the thermostat, and a second vent for connecting the first lower ventilation cavity and the second lower ventilation cavity.

[0011] Furthermore, the mounting groove includes a first mounting groove located on the first wind shield plate, and a second mounting groove located on the second wind shield plate and arranged corresponding to the first mounting groove.

[0012] Further, the first mounting grooves are arranged at intervals along the length direction of the first wind shield plate, and the second mounting grooves are arranged at intervals along the length direction of the second wind shield plate.

[0013] Furthermore, the heating mechanism is a heating wire.

[0014] Furthermore, the cross section of the mounting groove is U-shaped.

[0015] The utility model also provides a disinfection cabinet, comprising a shell and a heater as described above, wherein the shell is provided with a disinfection cavity communicated with the ventilation cavity.

[0016] The beneficial effects of the utility model are as follows:

[0017] The utility model provides a windshield on the ventilation cavity, and a heating mechanism is installed on the windshield, the windshield divides the ventilation cavity into a first ventilation cavity and a second ventilation cavity, and the windshield is provided with a vent that connects the first ventilation cavity and the second ventilation cavity. The vent is provided to balance the air volume of the first ventilation cavity and the second ventilation cavity, and avoids the local overheating of the ventilation cavity due to uneven air volume, so that no matter the thermostat is located in the first ventilation cavity or the second ventilation cavity, the heat dissipation effect will not be poor due to the small air volume, and the thermostat is prevented from frequently tripping. The utility model effectively solves the problem that the heater in the existing disinfection cabinet is provided with a windshield to install the heating mechanism, and the heater is divided into two sides by the windshield. Due to the air outlet principle of the fan, the air volume on one side of the heater is larger and the air volume on the other side is smaller. The thermostat in the heater is located on the side with smaller air volume, which greatly affects the heat dissipation effect of the thermostat. The thermostat is in a high temperature environment for a long time, and is prone to frequently triggering the protection mechanism due to overheating, which not only affects the normal operation of the disinfection cabinet, but also shortens the service life of the equipment.

[0018] The utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the disinfection cabinet of the utility model;

[0020] Figure 2 for Figure 1 An enlarged schematic diagram of the labeled section B;

[0021] Figure 3 It is a structural schematic diagram of the heater of the utility model;

[0022] Figure 4 This is a schematic structural diagram of a windshield of the utility model;

[0023] Figure 5 It is a schematic diagram of the airflow direction of the utility model. DETAILED DESCRIPTION

[0024] The implementation modes of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 5 A heater shown in the figure comprises a device body 1, the device body 1 comprises a ventilation cavity 2, a heating mechanism located on the ventilation cavity 2, a temperature controller 4 located on the ventilation cavity 2 and electrically connected to the heating mechanism, and a fan assembly 5 located on one side of the ventilation cavity 2, the ventilation cavity 2 is provided with a windshield 6 for installing the heating mechanism, the ventilation cavity 2 is divided into a first ventilation cavity 21 and a second ventilation cavity 22 by the windshield 6, and the windshield 6 is provided with a vent 8 connecting the first ventilation cavity 21 and the second ventilation cavity 22;

[0026] The utility model provides a windshield on the ventilation cavity, and a heating mechanism is installed on the windshield, the windshield divides the ventilation cavity into a first ventilation cavity and a second ventilation cavity, and the windshield is provided with a vent that connects the first ventilation cavity and the second ventilation cavity. The vent is provided to balance the air volume of the first ventilation cavity and the second ventilation cavity, and avoids the local overheating of the ventilation cavity due to uneven air volume, so that no matter the thermostat is located in the first ventilation cavity or the second ventilation cavity, the heat dissipation effect will not be poor due to the small air volume, and the thermostat is prevented from frequently tripping. The utility model effectively solves the problem that the heater in the existing disinfection cabinet is provided with a windshield to install the heating mechanism, and the heater is divided into two sides by the windshield. Due to the air outlet principle of the fan, the air volume on one side of the heater is larger and the air volume on the other side is smaller. The thermostat in the heater is located on the side with smaller air volume, which greatly affects the heat dissipation effect of the thermostat. The thermostat is in a high temperature environment for a long time, and is prone to frequently triggering the protection mechanism due to overheating, which not only affects the normal operation of the disinfection cabinet, but also shortens the service life of the equipment.

[0027] Optionally, in some embodiments, the heating mechanism (not shown) is a heating tube.

[0028] Furthermore, as a preferred embodiment of the present invention but not a limitation, the heating mechanism (not shown in the figure) is a heating wire, which can efficiently convert electrical energy into thermal energy, which is conducive to quickly heating the air or objects in the disinfection cabinet, helping to shorten the disinfection time and improve the disinfection efficiency; secondly, the heating wire is made of high temperature resistant and corrosion-resistant materials, such as nickel-chromium alloy, iron-chromium-aluminum alloy, etc. These materials have good physical and chemical stability, can work stably for a long time at high temperature, and are not easy to deform or damage.

[0029] Furthermore, the thermostat 4 can monitor the temperature inside the device or the surrounding environment in real time, which is helpful to ensure the accuracy and timeliness of temperature data.

[0030] Furthermore, when the temperature inside the device or the heating mechanism exceeds a safety threshold, the thermostat 4 can automatically cut off the power supply, effectively preventing fire or equipment damage caused by overheating.

[0031] Specifically, the heating mechanism is a heating wire, and the thermostat 4 controls the temperature of the heating wire. When the temperature of the heating wire exceeds the set temperature, the thermostat 4 trips and disconnects the power supply of the heating wire, so that the heating wire stops working and cools down. When the temperature drops to the low temperature set value, the thermostat 4 reconnects the power supply so that the heating wire can start heating.

[0032] like Figures 1 to 5 The device body 1 shown includes a fuse 7 located on the first ventilation cavity 21, and the thermostat 4 is located in the second ventilation cavity 22;

[0033] Optionally, in some embodiments, the fuse 7 and the thermostat 4 are both located on the first ventilation cavity 21 .

[0034] Optionally, in some embodiments, the fuse 7 and the thermostat 4 are both located on the second ventilation cavity 22 .

[0035] Furthermore, as a preferred mode but not limitation of the utility model, the fuse 7 is located in the first ventilation cavity 21, and the thermostat 4 is located in the second ventilation cavity 22. The fuse 7 and the thermostat 4 are respectively located in different ventilation cavities 2, which is beneficial to reduce electromagnetic interference and mechanical vibration interference between them and helps to maintain their respective stable operation and accurate measurement.

[0036] Furthermore, the fuse 7 is a final protection device. When the thermostat 4 fails to work due to a short circuit, the heating mechanism continues to generate heat, causing the temperature to be too high and dangerous. At this time, the fuse 7 is activated to disconnect the power supply, thereby stopping the heating mechanism from working, which is beneficial to improving safety.

[0037] like Figures 1 to 5 The wind shield 6 shown includes a first wind shield 61 arranged in the vertical direction and a second wind shield 62 arranged in the horizontal direction. The first wind shield 61 and the second wind shield 62 are both provided with a mounting groove 3 for mounting the heating mechanism.

[0038] Furthermore, by providing mounting grooves 3 on both the first wind shield 61 and the second wind shield 62, a flexible installation position for the heating mechanism can be provided; secondly, the heating mechanism is respectively provided on the first wind shield 61 and the second wind shield 62 through the mounting grooves 3, which helps to distribute the heat more evenly to various areas and effectively avoid the occurrence of local overheating or uneven cooling problems.

[0039] Furthermore, the mounting grooves 3 on the first wind shield plate 61 and the second wind shield plate 62 can provide stable support points, which helps to ensure that the heating mechanism is fixed inside the device and avoid displacement or loosening due to vibration or heat changes.

[0040] like Figures 1 to 5 The second ventilation cavity 22 is divided into a second upper ventilation cavity 221 and a second lower ventilation cavity 222 located below the second upper ventilation cavity 221 by the second wind shield plate 62, and the first ventilation cavity 21 is divided into a first upper ventilation cavity 211 communicating with the second upper ventilation cavity 221 and a first lower ventilation cavity 212 located below the first upper ventilation cavity 211 and communicating with the second lower ventilation cavity 222 by the second wind shield plate 62.

[0041] Furthermore, the coordinated division of the first wind deflector 61 and the second wind deflector 62 is conducive to accurately controlling the direction and distribution of the airflow, effectively improving the uniformity and efficiency of the airflow, and helping to ensure that all areas of the ventilation cavity 2 can be adequately ventilated and heated.

[0042] Furthermore, the provision of the first wind shield 61 and the second wind shield 62 can enhance the overall structural strength of the equipment, which is beneficial to improving the stability and durability of the equipment. Through reasonable segmentation and provision, it is beneficial to optimize the internal load distribution of the equipment and effectively reduce the risk of deformation or damage caused by uneven weight.

[0043] like Figures 1 to 5 The vent 8 shown includes a first vent 81 for connecting the first upper vent cavity 211 and the second upper vent cavity 221 and located near the thermostat 4, and a second vent 82 for connecting the first lower vent cavity 212 and the second lower vent cavity 222;

[0044] Optionally, the first vent 81 and the second vent 82 are both in the shape of long strips and extend along the length direction of the first wind shield 61, so that the first vent 81 and the second vent 82 can form a continuous airflow channel, so that the air can flow more smoothly, thereby improving the ventilation efficiency; secondly, this arrangement helps to achieve uniform distribution of airflow, reduce eddy currents and dead corners, and effectively ensure that all areas inside the equipment can be adequately ventilated.

[0045] Furthermore, by separately providing the first vent 81 and the second vent 82 , it is helpful to ensure that the air flows along a predetermined path inside the device, which helps to reduce the chaos and eddy currents of the air flow and effectively improve the ventilation efficiency.

[0046] Furthermore, setting the first vent 81 on a side close to the thermostat 4 helps to reduce thermal interference caused by heat generated by other components around the thermostat 4, which helps to ensure that the thermostat 4 works in a relatively stable temperature environment, thereby improving the accuracy of its measurement and judgment.

[0047] like Figures 1 to 5 The mounting groove 3 shown includes a first mounting groove 31 located on the first wind shield plate 61, and a second mounting groove 32 located on the second wind shield plate 62 and arranged corresponding to the first mounting groove 31;

[0048] Specifically, a first mounting groove 31 is provided above and below the first wind shield 61, and a second mounting groove 32 is provided on both sides of the left and right sides of the second wind shield 62. The heating mechanism is a heating wire, which extends through the first mounting groove 31 located at the top to the second mounting groove 32 on the left, then extends to the first mounting groove 31 located at the bottom, and finally extends to the second mounting groove 32 on the right. The heating wire passes through the four mounting grooves 3 in sequence, and the cross-section of the heating wire is diamond-shaped.

[0049] Furthermore, the corresponding arrangement of the first mounting groove 31 and the second mounting groove 32 on the two windshield plates can provide corresponding support points, which helps to evenly distribute the weight and stress of the heating mechanism, thereby enhancing the stability of the overall installation and reducing component displacement or loosening caused by uneven support.

[0050] Furthermore, the provision of the first mounting groove 31 and the second mounting groove 32 helps to avoid excessive concentration of heat in a certain part, thereby improving the overall thermal management effect of the device and helping to reduce the risk of overheating.

[0051] like Figures 1 to 5 The first mounting grooves 31 are arranged at intervals along the length direction of the first wind shield 61, and the second mounting grooves 32 are arranged at intervals along the length direction of the second wind shield 62;

[0052] Specifically, the first mounting grooves 31 are arranged at intervals along the length direction of the first wind shield plate 61, and the second mounting grooves 32 are arranged at intervals along the length direction of the second wind shield plate 62. The heating wires are arranged in a diamond shape in the same plane along the vertical direction, and the first mounting grooves 31 and the second mounting grooves 32 are arranged at corresponding intervals along the horizontal direction, so that several heating wires with diamond-shaped cross-sections can be arranged in the ventilation cavity 2 at the same time.

[0053] Furthermore, by arranging installation grooves 3 at intervals along the length direction on the first wind shield 61 and the second wind shield 62, multiple heating wires with diamond-shaped cross-sections can be accommodated and fixed, which is conducive to achieving uniform distribution of heat over a larger area and effectively avoiding problems such as local overheating or uneven cooling.

[0054] Furthermore, the diamond-shaped cross section increases the surface area of ​​the heating wire, thereby improving the heat exchange efficiency, making the heating effect more significant and facilitating energy saving.

[0055] Furthermore, the mounting groove 3 and the heating wire on the same plane in the vertical direction can be regarded as an independent module, so that the equipment is more convenient to maintain and upgrade, and it is conducive to replacing or adjusting a module separately without affecting the normal operation of other parts.

[0056] like Figures 1 to 5 The heating mechanism shown is a heating wire;

[0057] Furthermore, through reasonable layout and setting, the heating wires can be evenly distributed inside the ventilation cavity 2, thereby achieving uniform heating, helping to reduce temperature gradients, avoiding local overheating or overcooling, and improving the heating effect.

[0058] Furthermore, the heating wire is not prone to short circuit, open circuit and other faults during operation, and has good adaptability to fluctuations in parameters such as voltage and current, which helps to ensure the stability and safety of the equipment.

[0059] Furthermore, the heating wire can heat up quickly and reach a stable working temperature. The heating wire has a high resistivity and good thermal conductivity, so that the device can quickly enter the working state, which is conducive to improving the heating efficiency.

[0060] like Figures 1 to 5 The cross section of the mounting groove 3 shown is "U" shaped;

[0061] Furthermore, the cross-section of the mounting groove 3 is "U"-shaped. The mounting groove 3 with a "U"-shaped cross-section can provide a larger contact area, which is beneficial to ensure that the heating mechanism is firmly fixed in the mounting groove 3 and reduce the displacement or loosening of the equipment due to vibration or thermal expansion during operation; secondly, the mounting groove 3 with a "U"-shaped cross-section can effectively clamp and fix the heating mechanism, provide better stability, and prevent the heating mechanism from moving or tilting during use.

[0062] like Figures 1 to 5 A disinfection cabinet shown in the figure comprises a housing 9 and a heater as described above, wherein the housing 9 is provided with a disinfection cavity 91 communicating with the ventilation cavity 2;

[0063] Furthermore, through the connection between the ventilation chamber 2 and the disinfection chamber 91, the heat generated by the heater can be more evenly transferred to the disinfection chamber 91, which is beneficial to ensure uniform temperature distribution in the disinfection chamber 91, thereby improving the disinfection efficiency.

[0064] Furthermore, a good ventilation setting can improve the circulation efficiency of air and heat, thereby reducing the time required for disinfection, which is conducive to improving the efficiency of the disinfection process; secondly, the air flow through the ventilation cavity 2 can ensure that each area in the disinfection cavity 91 can be evenly disinfected, thereby improving the uniformity and comprehensiveness of disinfection.

[0065] Furthermore, an air inlet 92 connected to the fan assembly 5 is provided at the bottom of the shell 9. The air inlet 92 is located at the bottom of the shell 9 and is connected to the fan assembly 5, so that the fan assembly 5 can directly suck external air into the disinfection cabinet, which is beneficial to reduce the obstruction of air flow and effectively improve the ventilation efficiency.

[0066] The implementation method of this embodiment is as follows:

[0067] A heater comprises a device body 1, the device body 1 comprises a ventilation cavity 2, a heating mechanism located on the ventilation cavity 2, a temperature controller 4 located on the ventilation cavity 2 and electrically connected to the heating mechanism, and a fan assembly 5 located on one side of the ventilation cavity 2, a windshield 6 for installing the heating mechanism is provided on the ventilation cavity 2, the ventilation cavity 2 is divided into a first ventilation cavity 21 and a second ventilation cavity 22 by the windshield 6, a vent 8 connecting the first ventilation cavity 21 and the second ventilation cavity 22, and a mounting groove 3 for installing the heating mechanism is provided on the windshield 6, the heating mechanism is a heating wire, the heating wire is fixed on the windshield 6 through the mounting groove 3, the heating wire is located in the first ventilation cavity 21 and the second ventilation cavity 22 at the same time, and the cross section of the heating wire is rhombus-shaped, the vent 8 is provided so that the first ventilation cavity 21 and the second ventilation cavity 22 are connected, which helps The invention is to balance the air volume of the first ventilation cavity 21 and the second ventilation cavity 22, and avoid the local overheating of the ventilation cavity 2 due to uneven air volume, so that no matter the thermostat is located in the first ventilation cavity 21 or the second ventilation cavity 22, the heat dissipation effect will not be poor due to the small air volume, and the thermostat is prevented from frequent tripping. It effectively solves the problem that the heater in the existing disinfection cabinet is provided with a wind shield to install the heating mechanism, and the heater is divided into two sides by the wind shield. Due to the air outlet principle of the fan, the air volume on one side of the heater is larger and the air volume on the other side is smaller. The thermostat in the heater is located on the side with smaller air volume, which greatly affects the heat dissipation effect of the thermostat. The thermostat is in a high temperature environment for a long time, and it is easy to trigger the protection mechanism frequently due to overheating, which not only affects the normal operation of the disinfection cabinet, but also shortens the service life of the equipment.

[0068] A disinfection cabinet includes a shell 9, on which a disinfection chamber 91 connected to a ventilation chamber 2 is provided. The ventilation chamber 2 and the disinfection chamber 91 are connected so that the heat generated by a heater can be more evenly transferred to the disinfection chamber 91, which is beneficial to ensure uniform temperature distribution in the disinfection chamber 91, thereby improving disinfection efficiency.

[0069] The above examples are only used to further illustrate the technical content of the utility model, so that readers can understand it more easily, but it does not mean that the implementation methods of the utility model are limited to this. Any technical extension or re-creation made based on the utility model is protected by the utility model. The protection scope of the utility model shall be based on the claims.

Claims

1. A heater, comprising a device body (1), characterized in that: The device body (1) comprises a ventilation cavity (2), a heating mechanism located on the ventilation cavity (2), a temperature controller (4) located on the ventilation cavity (2) and electrically connected to the heating mechanism, and a fan assembly (5) located on one side of the ventilation cavity (2); a windshield (6) for mounting the heating mechanism is provided on the ventilation cavity (2); the ventilation cavity (2) is divided into a first ventilation cavity (21) and a second ventilation cavity (22) by the windshield (6); and a ventilation opening (8) connecting the first ventilation cavity (21) and the second ventilation cavity (22) is provided on the windshield (6).

2. A heater according to claim 1, characterized in that: The device body (1) comprises a fuse (7) located on the first ventilation cavity (21), and the temperature controller (4) is located in the second ventilation cavity (22).

3. A heater according to claim 1, characterized in that: The wind shield (6) comprises a first wind shield (61) arranged in a vertical direction and a second wind shield (62) arranged in a horizontal direction, and both the first wind shield (61) and the second wind shield (62) are provided with mounting grooves (3) for mounting the heating mechanism.

4. A heater according to claim 3, characterized in that: The second ventilation cavity (22) is divided into a second upper ventilation cavity (221) and a second lower ventilation cavity (222) located below the second upper ventilation cavity (221) by the second wind shield plate (62), and the first ventilation cavity (21) is divided into a first upper ventilation cavity (211) communicating with the second upper ventilation cavity (221) and a first lower ventilation cavity (212) located below the first upper ventilation cavity (211) and communicating with the second lower ventilation cavity (222) by the second wind shield plate (62).

5. A heater according to claim 4, characterized in that: The vent (8) comprises a first vent (81) for connecting the first upper vent cavity (211) and the second upper vent cavity (221) and located on a side close to the thermostat (4), and a second vent (82) for connecting the first lower vent cavity (212) and the second lower vent cavity (222).

6. A heater according to claim 3, characterized in that: The mounting groove (3) comprises a first mounting groove (31) located on the first wind shield plate (61), and a second mounting groove (32) located on the second wind shield plate (62) and arranged corresponding to the first mounting groove (31).

7. A heater according to claim 6, characterized in that: The first mounting grooves (31) are arranged at intervals along the length direction of the first wind shield plate (61), and the second mounting grooves (32) are arranged at intervals along the length direction of the second wind shield plate (62).

8. A heater according to claim 1, characterized in that: The heating mechanism is a heating wire.

9. A heater according to claim 3, characterized in that: The cross section of the mounting groove (3) is U-shaped.

10. A disinfection cabinet, characterized in that: It comprises a shell (9) and a heater according to any one of claims 1 to 9, wherein the shell (9) is provided with a disinfection cavity (91) connected to the ventilation cavity (2).

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