Wearable nasal cavity air environment improving device

Abstract

The utility model relates to the technical field of air conditioning, and provides a wearable nasal cavity air environment improving device which comprises a condensation and humidification structure, the condensation and humidification structure is used for condensing exhaled water vapor and humidifying air to be inhaled, the condensation and humidification structure comprises a heat dissipation shell and a metal sheet arranged in the heat dissipation shell, and the metal sheet is arranged in the heat dissipation shell. The side face of the heat dissipation shell is provided with a one-way exhaust port. And the two heat preservation nasal plugs are internally provided with gas channels, and the two heat preservation nasal plugs are both communicated with the condensation humidification structure. By condensing exhaled water vapor, humidifying to-be-inhaled air and properly heating the to-be-inhaled air in the nasal plug, the air inhaled into the nasal cavity is kept clean and appropriate in temperature and humidity, so that the air environment of the nasal cavity is improved, stimulation of dry and cold air in autumn to the nasal cavity can be reduced, and uncomfortable symptoms such as nasal cavity dryness and nasal plug can be relieved. The device is light in weight, portable, free of energy consumption in the operation process and wide in application range.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technical field, especially point to a kind of wearable nasal cavity air environment improvement device. BACKGROUND

[0002] With the acceleration of modern life rhythm, environmental pollution is increasingly serious, and air quality has become a global focus. For respiratory system, especially nasal cavity health, has been unprecedented challenge. Rhinitis, nasal cavity physiological defects and empty nose syndrome caused by nasal cavity operation and other problems, seriously affect the quality of life of patients.

[0003] The commonly used air conditioning equipment currently includes air purifier and breathing assistance equipment, which can usually be used indoors only, has the disadvantages of high energy consumption, inconvenience and narrow application range. UTILITY MODEL CONTENT

[0004] To solve the technical problems of the prior art, which can usually be used indoors only, has the disadvantages of high energy consumption, inconvenience and narrow application range, the utility model embodiment provides a wearable nasal cavity air environment improvement device. The technical solution is as follows:

[0005] A wearable nasal cavity air environment improvement device is provided, which comprises:

[0006] A condensation humidification structure is used to condense water vapor exhaled and humidify air to be inhaled, and the condensation humidification structure comprises a heat dissipation shell and a metal sheet arranged inside the heat dissipation shell, the side surface of the heat dissipation shell has a one-way exhaust port, and the end surface of the heat dissipation shell has a one-way air inlet.

[0007] Two heat preservation nasal plugs have gas passages inside, and both of the heat preservation nasal plugs are communicated with the condensation humidification structure.

[0008] Optionally, the heat preservation nasal plug is made of elastic metal material, and has a honeycomb heat preservation body inside, for transferring heat exhaled to air to be inhaled.

[0009] Optionally, a rubber shell is further arranged on the outer wall of the heat preservation nasal plug.

[0010] Optionally, it further comprises a fixing belt connected to the condensation humidification structure and used for fixing on the head of a user.

[0011] Optionally, it further comprises a balance valve arranged between the condensation humidification structure and the heat preservation nasal plug.

[0012] Optionally, the balance valve comprises a connecting portion and a flow guide flap arranged in the connecting portion, a central axis of the flow guide flap corresponds to the two heat preservation nasal plugs, and the flow guide flap is perpendicular to the gas passage direction of the heat preservation nasal plug in a balanced state.

[0013] Optionally, the balance valve comprises two adjustable opening valves, each of which corresponds to the gas passage of one heat preservation nasal plug.

[0014] Optionally, it further comprises two heat dissipation fins arranged on the side surface of the heat dissipation shell, and the heat dissipation fins are provided with through holes corresponding to the one-way exhaust port.

[0015] Optionally, it further comprises a filter layer arranged on the end surface of the heat dissipation shell, which is used to remove particles, bacteria and odors in the air.

[0016] Optionally, it further comprises a purification layer comprising a sheet-shaped activated carbon layer, and each activated carbon layer is arranged on the side surface of the metal sheet.

[0017] The technical scheme provided by the embodiment of the utility model brings at least the following beneficial effects:

[0018] The wearable nasal cavity air environment improvement device provided by the embodiment of the utility model condenses the water vapor exhaled and humidifies the air to be inhaled, and at the same time, the air to be inhaled is heated to a certain extent, so that the temperature of the air inhaled into the nasal cavity is appropriate, thereby improving the air environment of the nasal cavity, reducing the stimulation of cold air to the nasal cavity, improving the breathing comfort of the user, and helping to relieve the discomfort symptoms such as dryness of the nasal cavity and nasal congestion. The device is light in weight, portable, has no energy consumption in the running process, and has a wide range of applications. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0020] Figure 1 is one of the structure schematic diagram of the wearable nasal cavity air environment improvement device provided by the embodiment of the utility model;

[0021] Figure 2 is the second structure schematic diagram of the wearable nasal cavity air environment improvement device provided by the embodiment of the utility model.

[0022] Reference signs:

[0023] 1, condensation and humidification structure;

[0024] 11, heat dissipation shell; 12, metal sheet; 13, one-way exhaust port; 14, one-way air inlet;

[0025] 2, heat preservation nasal plug; 21, honeycomb heat preservation body;

[0026] 3, balance valve; 31, connecting part; 32, flow guide flap; 33, middle shaft;

[0027] 4, heat dissipation fin;

[0028] 5, filter layer

[0029] 6, purification layer. DETAILED DESCRIPTION

[0030] The technical solutions in the utility model will be described below with reference to the drawings.

[0031] In the embodiments of the utility model, the words such as "example" and "for example" are used to represent as an example, illustration or explanation. Any embodiment or design scheme described as "example" in the utility model should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. In fact, the word example is used to present the concept in a specific way. In addition, in the embodiments of the utility model, the meaning expressed by "and / or" can be both, or can be one of the two.

[0032] In order to make the technical problems, technical schemes and advantages to be solved by the utility model more clear, the following will be described in detail with reference to the drawings and specific embodiments.

[0033] Figure 1 is one of the structure schematic diagrams of the wearable nasal cavity air environment improvement device provided by the embodiments of the utility model, please refer to Figure 1 The embodiments of the utility model provide a wearable nasal cavity air environment improvement device, which comprises a condensation humidification structure 1 and two heat preservation nasal plugs 2, wherein the condensation humidification structure 1 is used for humidifying air, and the heat preservation nasal plug 2 is used for improving the temperature of air; the heat preservation nasal plug 2 can be inserted into the nostril of a user, so that in the state that the ambient temperature where the user is located is lower than the body temperature of the human body and the ambient humidity is lower than the humidity environment in the nasal cavity, the device can improve the humidity and temperature of the air inhaled by the user.

[0034] Since the exhaled air contains a certain amount of moisture, without using any breathing aid, this part of the moisture is usually released into the air and cannot be utilized. The condensation humidification structure 1 is used to condense part of the exhaled water vapor and store it in the form of condensed water in the condensation humidification structure 1. When the air to be inhaled flows in the condensation humidification structure 1, the part of the water vapor is taken away by the air, moistening the air, thereby achieving humidification of the air to be inhaled.

[0035] Specifically, the condensation humidification structure 1 includes a heat dissipation shell 11 and a metal sheet 12 arranged inside the heat dissipation shell 11. The heat in the exhaled air will be quickly released into the air through the metal sheet 12 and the heat dissipation shell 11, and the metal sheet 12 provides an attachment position for the water vapor. Through humidification, the nasal air environment is improved. Moreover, the metal sheet 12 can also adjust the temperature of the air to be inhaled to a certain extent.

[0036] The side surface of the heat dissipation shell 11 has a one-way air outlet 13, and after part of the moisture in the exhaled air is recovered, it will be discharged through the one-way air outlet 13. Due to the change of the direction of the gas flow, the retention time of this part of the gas is improved, thereby improving the retention rate of the moisture in the exhaled gas. The end surface of the heat dissipation shell 11 has a one-way air inlet 14, and the air to be inhaled enters the condensation humidification structure 1 through the one-way air inlet 14, avoiding causing respiratory resistance in the process of inhaling air.

[0037] The above-mentioned heat preservation nasal plug 2 has a gas channel inside, which is used to guide the air after humidification into the nasal cavity, and the two heat preservation nasal plugs 2 are in communication with the condensation humidification structure 1, ensuring that the air can flow smoothly inside the device. The two heat preservation nasal plugs 2 can be fixed in the nasal cavity of the user, forming a wearable structure. Moreover, the temperature of the exhaled gas of the user can also be stored for heating the fresh air to be inhaled. Through heating, the nasal air environment is improved.

[0038] When using the device, the working principle is as follows:

[0039] Exhalation process: when the user exhales, the exhaled gas enters the condensation humidification structure 1 through the heat preservation nasal plug 2. On the metal sheet 12, the exhaled water vapor will condense, and at the same time the metal sheet 12 will transfer heat to the heat dissipation shell 11, keeping the temperature inside the heat dissipation shell 11 appropriate. The condensed water vapor and waste gas are discharged through the one-way air outlet 13.

[0040] Inhalation process: when the user inhales, fresh air from the outside enters the condensation humidification structure 1 through the one-way air inlet 14. On the metal sheet 12, the fresh air is humidified and absorbs the heat inside the heat dissipation shell 11, so that its temperature approaches the suitable temperature of the nasal cavity. Subsequently, the humidified and heated air enters the nasal cavity through the heat preservation nasal plug 2, providing a comfortable, humid and temperature suitable air environment for the user.

[0041] The wearable nasal cavity air environment improvement device provided by the embodiment of the present application condenses the exhaled water vapor and humidifies the air to be inhaled, and at the same time, to a certain extent, heats the air to be inhaled, maintains the temperature of the inhaled air in the nasal cavity suitable, thereby improving the air environment in the nasal cavity, reducing the stimulation of cold air to the nasal cavity, improving the breathing comfort of the user, and helping to relieve the discomfort symptoms such as dryness of the nasal cavity and nasal congestion. The device is light in weight, portable, has no energy consumption in the running process, and has a wide range of applications.

[0042] In addition, maintaining the moisture and temperature of the nasal cavity suitable helps to reduce the breeding of bacteria, viruses and other pathogens, thereby promoting respiratory health.

[0043] Figure 2 is a structure schematic view two of a wearable nasal cavity air environment improvement device provided by the embodiment of the present application, please see Figure 2 In an embodiment provided by the present application, the heat preservation nasal plug 2 is made of metal material, and the heat preservation nasal plug 2 has a honeycomb heat preservation body 21 inside, which is used to transfer the exhaled heat to the air to be inhaled.

[0044] The metal material has good thermal conductivity and can quickly transfer the exhaled heat to the air to be inhaled. The honeycomb heat preservation body 21 has many small channels and cavities inside, which can store and transfer heat. When the user exhales, the exhaled heat is absorbed and stored by the honeycomb heat preservation body 21; when the user inhales, the stored heat is transferred to the air to be inhaled, so that the temperature of the air to be inhaled is improved. In addition, the honeycomb heat preservation body 21 can also increase the contact area of the air and the heat preservation body, thereby improving the heat transfer efficiency.

[0045] The combination design of the metal material and the honeycomb heat preservation body 21 can significantly improve the heat preservation effect of the device. By storing and transferring the exhaled heat, the device can provide an additional heat source for the air to be inhaled, so that the temperature of the air to be inhaled is improved.

[0046] In an embodiment provided by the present application, a rubber shell is further arranged on the outer wall of the heat preservation nasal plug 2.

[0047] The rubber shell tightly wraps on the outer wall of the heat preservation nasal plug 2, forming a continuous sealing layer. This shell not only effectively prevents external cold air from directly invading the heat preservation structure, but also prevents the heat preservation structure from being physically damaged or chemically corroded. At the same time, the elasticity of the rubber shell can ensure that the nasal plug tightly fits the nostrils of the user, reducing air leakage, thereby improving the heat preservation effect.

[0048] In the embodiment, by arranging two heat preservation nasal plugs 2 that can be inserted into the nostrils, the heat preservation nasal plug 2 is externally harmless silica gel and internally elastic metal structure, which ensures that the device is solid, comfortable and gas smooth when worn.

[0049] In one embodiment of the present application, the device further comprises a fixing belt connected to the condensation humidification structure 1 and used for fixing on the head of the user.

[0050] The fixing belt is used to stably fix the entire device on the head of the user, ensuring that the heat preservation and humidification effects are not affected by movement or shaking during use. The fixing belt can be made of soft and elastic materials such as nylon, polyester fiber or rubber, etc., to ensure that it can tightly fit the head of the user and not bring excessive compression or discomfort to the user. At the same time, the length and width of the fixing belt can be designed as needed to ensure that it can provide sufficient fixing force while not being too tight or constricting the head of the user.

[0051] In one embodiment of the present application, the device further comprises a balance valve 3 arranged between the condensation humidification structure 1 and the heat preservation nasal plug 2.

[0052] The balance valve 3 is used to guide and optimize the flow path of the air flow, to ensure that the air can smoothly and efficiently pass through the condensation humidification structure 1 for humidification and heat preservation treatment, and finally enter the nasal cavity of the user through the heat preservation nasal plug 2.

[0053] The balance valve 3 can have various shapes and designs, such as streamlined, conical or other shapes that can guide the smooth flow of air flow. At the same time, the balance valve 3 can also reduce the turbulence and vortex of the air flow inside the device, reduce energy loss, and improve the efficiency and performance of the entire device.

[0054] Specifically, when exhaling, the air flows along the heat preservation nasal plug 2, the balance valve 3 and the condensation humidification structure 1 in sequence.

[0055] After passing through the condensation humidification structure 1, the water vapor is retained on the purification layer 6, and the metal sheet 12 is heated, and the waste air is directly discharged.

[0056] When inhaling, the air flows along the filter layer 5, the condensation humidification structure 1, the balance valve 3 and the heat preservation nasal plug 2 in sequence.

[0057] Air is purified by filter layer 5, cold air passes through metal sheet 12 in the middle of heat dissipation shell 11 and purification layer 6, temperature is increased and humidity is increased, air passes through balance valve 3, air intake of two nostrils is relatively balanced, and finally enters the nasal cavity.

[0058] The balance valve 3 described above can be realized by various structures, and two structures will be described below as examples:

[0059] Firstly, in an embodiment of the utility model, the balance valve 3 includes a connecting part 31 and a flow guide flap 32 arranged in the connecting part 31, and the central axis 33 of the flow guide flap 32 corresponds to the two heat preservation nasal plugs 2, for controlling the air intake balance of the bilateral nasal cavity.

[0060] In the case that the user's both noses are in a healthy state, the suction force is balanced, and the flow guide flap 32 is perpendicular to the gas passage direction of the heat preservation nasal plug 2 in the balanced state.

[0061] The flow guide flap 32 is usually made of a piece of material with a certain thickness and rigidity, such as metal, plastic or composite material, etc. The central axis 33 of the flow guide flap 32 corresponds to the two heat preservation nasal plugs 2, and the flow guide flap 32 is perpendicular to the gas passage direction of the heat preservation nasal plug 2 in the balanced state. Through the guidance of the flow guide flap 32, the airflow can enter the gas passage of the heat preservation nasal plug 2 more smoothly and efficiently.

[0062] For users such as patients with rhinitis, one nostril is often not ventilated smoothly, and the other nostril is ventilated normally. In this case, if no intervention is made, the normally ventilated nostril will bear most of the ventilation, and the not smoothly ventilated nostril will remain not smoothly ventilated or be more blocked. By using the device provided in the embodiment of the utility model, when inhaling, the normally ventilated nostril has a larger suction force, which can suck the corresponding half flap to be close to the heat preservation nasal plug 2, the corresponding ventilation passage is narrowed, and the ventilation amount of the nostril is reduced. At the same time, the corresponding channel of the corresponding half flap of the not smoothly ventilated nostril is completely open, which improves the ventilation amount of the nostril, and long-term use is beneficial to reduce the blockage of the nostril.

[0063] Secondly, in an embodiment of the utility model, the balance valve 3 includes two valves with adjustable opening degree, and each valve corresponds to the gas passage of one heat preservation nasal plug 2.

[0064] The valve with adjustable opening degree allows the user to flexibly adjust the opening degree of the valve according to actual needs, so as to control the air flow through the valve. In this embodiment, the user can accurately adjust the airflow according to the difficulty of breathing, the demand for oxygen, etc.

[0065] In one embodiment of the utility model provides, still include: two fin 4, fin 4 is through increasing the heat dissipation area to accelerate the emission of heat. Fin 4 is arranged at the side of heat dissipation shell 11, can effectively utilize space, ensure heat can be effectively transferred to the surrounding environment simultaneously, for improving the heat dissipation efficiency of the device, and there is the through hole corresponding with one-way exhaust port 13 on fin 4.

[0066] Need to explain, this fin 4 can be integrated with condensation humidification structure 1, or separately arranged, this embodiment does not make limited to this.

[0067] In one embodiment of the utility model provides, the device still includes: filter layer 5, filter layer 5 is arranged on the end face of heat dissipation shell 11, that is, the outside of one-way air inlet 14, for removing the fine particles, bacteria and peculiar smell in air.

[0068] Filter layer 5 can effectively block dust, particulate matter or other harmful substances into the equipment interior.

[0069] Summarized above, the filter layer 5 of the embodiment is arranged on the end face of heat dissipation shell 11, realizes the filtration function of the airflow entering the equipment interior, and this design helps to improve the filtration performance of the equipment.

[0070] Specifically, in the embodiment, filter layer 5 can be made of high-efficiency filtering material, such as HEPA (High Efficiency Particulate Air, high-efficiency air filter) filter screen, etc., to ensure efficient filtration of small particulate matter and harmful gases in the air.

[0071] Further, in one embodiment of the utility model, the device further includes: purification layer 6, the purification layer 6 includes sheet-shaped activated carbon layer, and each activated carbon layer is arranged on the side of the metal sheet. That is, the activated carbon is inserted into the heat dissipation shell 11 in the form of multiple sheets, and the activated carbon layer is in close contact with the metal sheet 12, the water droplets formed by condensation are absorbed by the activated carbon layer, and the related bacteria and harmful substances are also absorbed by the activated carbon layer.

[0072] The activated carbon layer plays an important role in adsorbing peculiar smell, and its high adsorption performance and low cost make it the preferred material for treating peculiar smell. The following is a detailed explanation of the activated carbon layer adsorbing peculiar smell: activated carbon is a porous carbon-containing substance with a large number of fine pores inside. These pore structures make activated carbon have a large specific surface area, thus having excellent adsorption capacity. In VOCs (volatile organic compounds) peculiar smell treatment, activated carbon mainly removes peculiar smell molecules through physical adsorption. When waste gas containing VOCs passes through the activated carbon layer, the peculiar smell molecules are captured and fixed by the micropores on the surface of the activated carbon, thereby purifying the waste gas.

[0073] When using the device, the filtering screen and the activated carbon layer can be replaced regularly to maintain good purification effect.

[0074] Further, the metal sheet 12 is designed as a porous ultra-thin sheet, so that the condensed water on the side of the metal sheet 12 opposite to the activated carbon layer can also be absorbed by the activated carbon layer through the porous structure, thereby improving the adsorption effect of the condensed water.

[0075] By arranging the balance valve 3 between the heat preservation nasal plug 2 and the condensation humidification structure 1, the balance valve 3 acts as a seesaw, and when the air intake on one side is large, the air intake on the other side will be appropriately reduced, so that the air intake of one side of the nasal cavity is smooth, and the air intake of the other side is not smooth.

[0076] The condensation humidification structure 1 is used for condensing the water vapor exhaled by a user and humidifying the air to be inhaled, and the condensation humidification structure 1 comprises a heat dissipation shell 11 and a metal sheet 12 arranged in the heat dissipation shell 11, and the side surface of the heat dissipation shell 11 is provided with a one-way air outlet 13, so that the exhaled air passes through the condensation metal sheet 12 and is directly discharged without passing through the filter layer 5, while the inhaled air passes through the filter layer 5.

[0077] Further, the filter layer 5 and the purification layer 6 are designed as an integrated structure, the filter layer 5 is arranged at the front end of the condensation humidification structure 1, the purification layer 6 is arranged in the heat dissipation shell 11 in a plurality of sheet structures, and the purification layer 6 is in close contact with the heat dissipation fins of the heat dissipation shell 11, so that the water droplets formed by condensation are absorbed by the purification layer 6, and the related bacteria and harmful substances are also absorbed by the purification layer 6.

[0078] The wearable nasal cavity air environment improvement device provided by the embodiment of the present application can condense the water vapor exhaled by a user and humidify the air to be inhaled, and can also heat the air to be inhaled to a certain extent, so that the temperature of the inhaled air in the nasal cavity is appropriate, thereby improving the air environment in the nasal cavity, reducing the stimulation of cold air on the nasal cavity, improving the breathing comfort of a user, and helping to relieve the symptoms such as dryness of the nasal cavity and nasal congestion. The device is light in weight, portable, has no energy consumption in the running process, and has a wide range of applications.

[0079] Further, the device can effectively recover the exhaled water vapor and heat, and can also realize the nasal cavity air environment improvement device with no energy consumption and convenient wearing, and is particularly suitable for patients with rhinitis, people with physiological defects in the nasal cavity, and people with empty nose syndrome caused by nasal cavity surgery, and can help to provide more refined nasal cavity environment management for them to alleviate the symptoms and promote recovery.

[0080] It should be understood that the term "and / or" in this document is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after it, but it can also represent an "and / or" relationship, which can be understood in the context before and after it.

[0081] In the utility model, "at least one" means one or more, and "a plurality of" means two or more. "At least one of the following" or the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0082] It should be understood that in various embodiments of the utility model, the size of the serial number of the above processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the utility model.

[0083] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A wearable nasal air environment improvement device, characterized by, The device comprises: a condensation humidification structure for condensing water vapor exhaled and humidifying air to be inhaled, the condensation humidification structure comprising a heat dissipation shell and a metal sheet arranged inside the heat dissipation shell, a side surface of the heat dissipation shell having a one-way air outlet, and an end surface of the heat dissipation shell having a one-way air inlet; two heat preservation nasal plugs, each having a gas passage inside and being in communication with the condensation humidification structure.

2. The apparatus of claim 1, wherein, The heat preservation nasal plugs are made of elastic metal material and have a honeycomb heat preservation body inside for transferring heat exhaled to air to be inhaled.

3. The apparatus of claim 1, wherein, The heat preservation nasal plugs further have a rubber shell on the outer wall.

4. The apparatus of claim 1, wherein, Further comprising: a fixing belt connected to the condensation humidification structure and used for fixing on the head of a user.

5. The apparatus of claim 1, wherein, Further comprising: a balance valve arranged between the condensation humidification structure and the heat preservation nasal plugs.

6. The apparatus of claim 5, wherein, The balance valve comprises a connecting portion and a flow guide flap arranged in the connecting portion, the central axis of the flow guide flap corresponding to the two heat preservation nasal plugs, and the flow guide flap being perpendicular to the gas passage of the heat preservation nasal plugs in a balanced state.

7. The apparatus of claim 5, wherein, The balance valve comprises two valves with adjustable opening degrees, each corresponding to the gas passage of one heat preservation nasal plug.

8. The apparatus of claim 1, wherein, Further comprising: two heat dissipation fins arranged on the side surface of the heat dissipation shell and having through holes corresponding to the one-way air outlet.

9. The apparatus of claim 1, wherein, Further comprising: a filter layer arranged on the end surface of the heat dissipation shell and used for removing particles, bacteria and peculiar smell in air.

10. The apparatus of claim 9, wherein, Further comprising: a purification layer comprising sheet-shaped activated carbon layers, each arranged on the side surface of the metal sheet.

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