Direct heating system and breathing machine

Abstract

This application provides a direct heating system and a ventilator. The direct heating system is used to heat water in the ventilator's water tank. The system includes: a sheet-like heating aluminum substrate located below an opening at the bottom of the ventilator's water tank, with its front side directly contacting the water to be heated, and an electric heating element and a third connector disposed on its back side; the heating aluminum substrate is encased in a silicone sleeve; a first hole is formed in the direction where the silicone sleeve encases the front side of the heating aluminum substrate; except for the edges which are encased in the silicone sleeve, the rest of the front side of the heating aluminum substrate is exposed through the first hole; a second hole is formed in the direction where the silicone sleeve encases the back side of the heating aluminum substrate; the third connector of the heating aluminum substrate is exposed through the second hole; a sealing rib is provided at the edge of the first hole in the silicone sleeve; a clamping rib is provided at the bottom of the ventilator's water tank at the position corresponding to the sealing rib, clamping the sealing rib to prevent water leakage from the ventilator's water tank. The advantages of this application are: high thermal efficiency and safe use.

Description

Technical Field

[0001] This application belongs to the field of ventilator technology, specifically relating to a direct heating system and a ventilator. Background Technology

[0002] The air in a ventilator needs to pass over the surface of heated water to keep the air inhaled by the user humidified. Currently, the heating structure of the ventilator water tank is divided into two types: indirect heating and direct heating.

[0003] like Figure 1 As shown, in the water tank of an indirect heating ventilator, the electrically heated water structure A2 is generally located at the bottom of the water tank A1. To prevent leakage, a multi-layered structure is used to wrap the electric heating element. The heat generated by the electric heating element needs to be transferred multiple times to reach the water. This heating method has low heating efficiency, and the heating structure generates significant heat around it, which can easily cause thermal damage to other components and also easily burn the operator.

[0004] like Figure 2 As shown, in a direct-heating ventilator, the water tank consists of an upper shell B1 and a lower shell B2. A silicone cushioning pad B4 is installed on the upper shell B1. The water tank heater B3 is installed on the silicone cushioning pad B4. The water tank is connected to the main unit, and electrical energy is supplied to the heater B3 via the water tank heating control board, generating heat that is transferred to the water in the tank, thus heating the water.

[0005] The buffer silicone pad B4 is made of silicone, allowing for easy manual removal and installation when adding water. The water tank heater B3 consists of a water tank heating control board and an electric heater. When adding water, heater B3 is removed along with the buffer silicone pad B4, exposing the electric heater, which could potentially cause burns to people or objects. Because the entire heating element is submerged in water, it is inconvenient to use adhesive to bond the buffer silicone pad B4 to the electric heater, reducing the reliability of the electric heater's fixation.

[0006] The electric heater is encased in a silicone protective sleeve (B5) to prevent other parts of the water tank from being damaged by the heat. Figure 3 As shown, the part of the silicone protective sleeve B5 facing the bottom of the water tank needs to be equipped with spaced protrusions B6 to prevent the silicone protective sleeve B5 from being vacuum-adhere to the bottom of the water tank when the water temperature cools down, thus preventing dry burning before the water in the tank is completely consumed. Summary of the Invention

[0007] The purpose of this application is to overcome the shortcomings of existing heating systems, such as low heating efficiency and the risk of burns to operators.

[0008] To achieve the above objectives, this application proposes a direct heating system for heating water in a ventilator tank, the system comprising: a sheet-like heating aluminum substrate;

[0009] The bottom of the ventilator water tank has an opening that is the same shape as the heating aluminum substrate but slightly smaller in size.

[0010] The heating aluminum substrate is located below the opening at the bottom of the water tank of the ventilator. Its front side is in direct contact with the water to be heated, and its back side is provided with an electric heating element and a third connector. The third connector is used to connect to a power source.

[0011] The heating aluminum substrate is wrapped by an aluminum substrate silicone sleeve; a first hole is opened in the direction of the aluminum substrate silicone sleeve covering the front of the heating aluminum substrate; except for the edges which are covered by the aluminum substrate silicone sleeve, the rest of the front of the heating aluminum substrate is exposed through the first hole; a second hole is opened in the direction of the aluminum substrate silicone sleeve covering the back of the heating aluminum substrate; a third connector of the heating aluminum substrate is exposed through the second hole.

[0012] The first hole edge of the silicone sleeve on the aluminum substrate has a sealing rib; the bottom of the ventilator water tank has a clamping rib at the position corresponding to the sealing rib; the clamping rib clamps the sealing rib to prevent water leakage from the ventilator water tank.

[0013] As an improvement to the above system, the system also includes a water tank heating conversion circuit board;

[0014] The water tank heating conversion circuit board includes a water tank heating conversion circuit board body, a second connector, and a connecting metal post;

[0015] The second connector and the connecting metal post are respectively fixed on the same side of the water tank heating conversion circuit board body; the second connector and the connecting metal post are electrically connected through the circuit inside the water tank heating conversion circuit board body.

[0016] The second and third connectors are electrically connected via cables and adapters;

[0017] The connecting metal post is used to connect to the power supply.

[0018] As an improvement to the above system, the water tank heating conversion circuit board is located below the ventilator main unit, vertically fixed in the base, with the connecting metal column on top and the second connector on the bottom;

[0019] The upper part of the base extends into a connecting metal column protruding shaft; the connecting metal column protruding shaft wraps around the cylindrical surface of the connecting metal column and exposes the end face of the connecting metal column; the end face of the connecting metal column is recessed into the connecting metal column protruding shaft.

[0020] The connecting metal column near the water tank heating conversion circuit board body is tightly wrapped by the connecting metal column sealing ring; the contact points between the connecting metal column sealing ring and the connecting metal column, the water tank heating conversion circuit board body and the connecting metal column protruding shaft are all interference fits to prevent water from seeping into the base from the gap between the connecting metal column and the connecting metal column protruding shaft.

[0021] As an improvement to the above system, the system also includes a main unit heating conversion circuit board located at the bottom of the ventilator main unit;

[0022] The host heating conversion circuit board includes a host heating conversion circuit board body, a first connector, a spring pin connector, and a contact protrusion;

[0023] The first connector is fixed to the main heating conversion circuit board body; the contact protrusion is fixed to the opposite end of the main heating conversion circuit board body on the same side as the first connector via a spring pin connector;

[0024] The first connector is used to connect to a power source;

[0025] The contact protrusion has a cylindrical structure and a built-in spring. When the main heating conversion circuit board is connected to the water tank heating conversion circuit board, the contact protrusion and the head of the connecting metal column of the water tank heating conversion circuit board are in close contact one-to-one in the axial direction, and the spring is compressed by force.

[0026] As an improvement to the above system, the system also includes a sealing surrounding stiffener plate of an annular structure located in the base;

[0027] Below the sealing rib, a sealing ring matching its shape is provided; the bottom cover of the ventilator presses the sealing ring of the sealing rib, so that the bottom cover of the ventilator, the sealing rib, the top cover of the base, the back of the heated aluminum substrate and the sealing ring of the connecting metal column together form a sealed space.

[0028] The water tank heating conversion circuit board, the third connector of the heating aluminum substrate and other circuit components, as well as the cables and adapters between the water tank heating conversion circuit board and the heating aluminum substrate, are located in the sealed space.

[0029] As an improvement to the above system, the bottom cover of the ventilator is provided with multiple drainage holes outside the area surrounded by the annular structure of the sealing and surrounding stiffener.

[0030] As an improvement to the above system, a front stop rib is provided on the bottom cover of the ventilator, and a rear stop rib is provided on the base; the front stop rib and the rear stop rib clamp the water tank heating conversion circuit board from both the front and rear directions.

[0031] As an improvement to the above system, the first connector, the second connector, and the third connector are 5-pin connectors.

[0032] As an improvement to the above system, the system also includes a temperature sensor located on the back of the heated aluminum substrate; when the temperature sensor detects that the temperature of the heated aluminum substrate exceeds a set threshold, the system cuts off the power supply to the heated aluminum substrate.

[0033] This application provides a ventilator that includes the system described above.

[0034] Compared with existing technologies, the advantages of this application are:

[0035] 1. This application uses a direct heating method, which has high thermal efficiency and will not cause excessive thermal damage to surrounding devices;

[0036] 2. When adding water to the water tank, the heating element will not come into contact with people or external objects, making it safer to use;

[0037] 3. The direct heating system of this application has a simple structure, is easy to install, and is robust and reliable. Attached Figure Description

[0038] Figure 1 The figure shown is a longitudinal cross-sectional view of an existing indirect heating ventilator;

[0039] Figure 2 The image shown is a longitudinal cross-sectional view of an existing direct-heating ventilator.

[0040] Figure 3 The diagram shows a schematic of a silicone protective sleeve for a direct-heating ventilator heater.

[0041] Figure 4 The figure shown is a longitudinal cross-sectional view of the ventilator of this application;

[0042] Figure 5 The diagram shown is a structural diagram of the main unit's heating conversion circuit board;

[0043] Figure 6 The diagram shown is a structural diagram of the water tank heating conversion circuit board;

[0044] Figure 7 The diagram shows the structure of the heated aluminum substrate.

[0045] Figure 8 The diagram shows the installation of the water tank heating conversion circuit board.

[0046] Figure 9 The image shown is a detailed schematic diagram of the water tank heating conversion circuit board installation.

[0047] Figure 10 The image shown is a detailed enlarged view of the installation schematic diagram of the water tank heating conversion circuit board;

[0048] Figure 11 The image shown is a 3D view and a longitudinal section view of the sealing ring connecting the metal column;

[0049] Figure 12 The diagram shows the location of the front stop rib plate in the base used for the water tank heating conversion circuit board;

[0050] Figure 13The diagram shows the location of the rear stop rib and the drain hole of the circuit board used for heating the water tank in the base.

[0051] Figure 14 The diagram shown is a structural diagram of the sealing surrounding stiffening plate in the base;

[0052] Figure 15 The diagram shows the structure of the sealing ring that is matched with the sealing surrounding stiffener.

[0053] Figure 16 The diagram shown is of the structure of the silicone sleeve on the aluminum substrate.

[0054] Figure 17 The diagram shows the structure of the pressing and sealing ribs on the base.

[0055] Attached image labels:

[0056] A1: Water tank of an indirect heating ventilator; A2: Electric water heating structure of an indirect heating ventilator; B1: Upper shell of the water tank of a direct heating ventilator; B2: Lower shell of the water tank of a direct heating ventilator.

[0057] B3: Water tank heater for direct-heated ventilators; B4: Silicone cushioning pad for water tanks in direct-heated ventilators; B5: Silicone protective sleeve for water tanks in direct-heated ventilators.

[0058] B6: Silicone protective sleeve for water tank of direct-heating ventilator with raised dots

[0059] 1. Main unit 2. Water tank

[0060] 3. Main circuit board of the main unit; 4. Main heating conversion circuit board of the main unit.

[0061] 5. Water tank heating conversion circuit board; 6. Heating aluminum substrate.

[0062] 7. First connector; 8. Spring pin connector

[0063] 9. Contact protrusion; 10. Main unit heating conversion circuit board body; 11. Connecting metal post; 12. Second connector.

[0064] 13. Water tank heating conversion circuit board body 14. Base

[0065] 15. Heating the front side of the aluminum substrate 16. Heating the back side of the aluminum substrate

[0066] 17. Electric heating element; 18. Third connector

[0067] 19. Bottom cover; 20. Connecting metal column protruding shaft

[0068] 22. Connecting metal column sealing ring; 23. Front stop rib plate.

[0069] 24. Rear stop rib plate 25. Drain hole

[0070] 26. Sealing surround stiffener plate 27. Sealing surround stiffener plate sealing ring

[0071] 28. Silicone sleeve on aluminum substrate 29. First hole

[0072] 30. Second hole; 31. Sealing rib

[0073] 32. Tighten the reinforcing ribs Detailed Implementation

[0074] The technical solution of this application will be described in detail below with reference to the accompanying drawings.

[0075] like Figure 4 As shown, the direct heating system provided in this application is used to heat the water in the water tank 2 of a ventilator. The base 14 of the water tank 2 extends to one side, and the main unit of the ventilator is mounted on it. A heating aluminum substrate 6 is provided at the bottom of the water-filled part of the water tank 2, and one side of the heating aluminum substrate 6 is in direct contact with the water in the water tank for heating the water.

[0076] The heating aluminum substrate 6 generates heat through the heating principle of the heating wire. Its power source comes from the main circuit board 3 on the top of the ventilator host. The main circuit board 3 transmits electrical energy to the host heating conversion circuit board 4, and then to the heating aluminum substrate 6 through the water tank heating conversion circuit board 5.

[0077] like Figure 5 As shown, the main unit heating conversion circuit board 4 is located at the bottom of the main unit 1, and includes the main unit heating conversion circuit board body 10, a first connector 7, a spring-loaded connector 8, and a contact protrusion 9. The first connector 7 is fixed to the main unit heating conversion circuit board body 10. The contact protrusion 9 is fixed to the main unit heating conversion circuit board body 10 via the spring-loaded connector 8, located at the opposite end on the same side as the first connector 7. The first connector 7 is preferably a 5-pin connector. The first connector 7 is electrically connected to the contact protrusion 9 through the circuitry within the main unit heating conversion circuit board body 10. The main unit main circuit board 3 is electrically connected to the first connector 7 of the main unit heating conversion circuit board 4 via a cable and an adapter (the cable and adapter are not shown in the figure). The spring-loaded connector 8 and the contact protrusion 9 combine to form a male connector. The contact protrusion 9 has a cylindrical structure with a built-in spring and is a retractable structure.

[0078] like Figure 6As shown, the water tank heating conversion circuit board 5 is embedded in the base 14, located below the main unit 1, and includes a water tank heating conversion circuit board body 13, a second connector 12, and a connecting metal post 11. The second connector 12 and the connecting metal post 11 are fixed on the same side of the water tank heating conversion circuit board body 13. The second connector 12 and the connecting metal post 11 are electrically connected through the internal circuitry of the water tank heating conversion circuit board body 13. The second connector 12 is preferably a 5-pin connector. The connecting metal post 11 is preferably a copper post. After the main unit 1 is installed on the base 14, the contact protrusions 9 of each main unit heating conversion circuit board 4 contact the connecting metal post 11 of the water tank heating conversion circuit board 5 in the axial direction, and the spring inside the contact protrusion 9 is compressed, making the contact protrusion 9 and the connecting metal post 11 in close contact.

[0079] like Figure 7 As shown, the heating aluminum substrate 6 has a sheet-like structure. To adapt to the shape of the water tank 2, the heating aluminum substrate 6 can be made into a crescent shape and located at the bottom of the water tank 2. The front side 15 of the heating aluminum substrate is made of aluminum alloy and directly contacts the water in the water tank. The back side 16 of the heating aluminum substrate is provided with an electric heating element 17, a third connector 18, and other circuit components. The third connector 18 is preferably a 5-pin connector. The third connector 18 is electrically connected to the second connector 12 of the water tank heating conversion circuit board 5 via a cable and an adapter.

[0080] like Figure 16 As shown, the heating aluminum substrate 6 is wrapped by an aluminum substrate silicone sleeve 28. The aluminum substrate silicone sleeve 28 has a first hole 29 on the front side 15 of the heating aluminum substrate, exposing most of the front side 15 of the heating aluminum substrate 6, allowing it to directly contact the water in the water tank 2, except for covering the edges. A second hole 30 is opened on the back side of the aluminum substrate silicone sleeve 28 to expose the third connector 18 and other components such as fuses on the heating aluminum substrate 6. Except for the first hole 29 and the second hole 30, the rest of the heating aluminum substrate 6 is completely wrapped by the aluminum substrate silicone sleeve 28 of a certain thickness. The aluminum substrate silicone sleeve 28 is made of silicone, which has good heat insulation properties, allowing more heat to dissipate from the heating surface of the heating aluminum substrate 6 to the water.

[0081] like Figure 17 As shown, the edge of the first hole 29 of the aluminum substrate silicone sleeve 28 has a sealing rib 31. The base of the water tank 2 has a clamping rib 32 at the corresponding edge of the first hole 29. When the heated aluminum substrate 6 is correctly installed, the clamping rib 32 clamps the sealing rib 31, which can seal the gap between the aluminum substrate silicone sleeve 28 and the base of the water tank 2.

[0082] like Figure 8 , Figure 9 , Figure 10 and Figure 11As shown, the water tank heating conversion circuit board 5 is vertically fixed on the base 14, with the connecting metal post 11 on top and the second connector 12 on the bottom. A connecting metal post protrusion 20 extends from the upper part of the base 14, wrapping around the cylindrical surface of the connecting metal post 11 and exposing the end face of the connecting metal post 11. The end face of the connecting metal post 11 is recessed into the connecting metal post protrusion 20 to prevent the operator's fingers from directly contacting the connecting metal post 11. The position of the connecting metal post 11 near the water tank heating conversion circuit board body 13 is tightly wrapped by a connecting metal post sealing ring 22. The contact points between the connecting metal post sealing ring 22 and the connecting metal post 11, the water tank heating conversion circuit board body 13, and the connecting metal post protrusion 20 are all interference fits to prevent water from seeping into the base 14 through the gap between the connecting metal post 11 and the connecting metal post protrusion 20. When the main unit 1 is installed on the base 14, the contact protrusion 9 of the main unit heating conversion circuit board 4 extends into the protruding shaft 20 of the connecting metal post and makes close contact with the end face of the connecting metal post 11.

[0083] The connecting metal post 11 is recessed within the connecting metal post protruding shaft 20 to form a female connector. When the host 1 is installed on the base 14, it is connected to the male connector formed by the spring pin connector 8 and the contact protrusion 9. This connection method has the following advantages: (1) When the host 1 is installed on the base 14, the circuit is also connected at the same time, which is easy to operate; (2) There is only one connection method between the male connector and the female connector, so even people who do not know the installation method will not install it incorrectly; (3) After connection, the circuit is completely sealed inside the insulator to prevent water from seeping into the circuit and causing a short circuit.

[0084] like Figure 12 , Figure 13 As shown, when the main unit heating conversion circuit board 4 is in the correct installation position, the contact protrusion 9 exerts a pushing force on the connecting metal post 11. To fix the front and rear positions of the water tank heating conversion circuit board 5, a front stop rib 23 is provided on the bottom cover 19, and a rear stop rib 24 is provided on the base 14 (to show the specific position of the rear stop rib 24...). Figure 13 (This is shown on the bottom cover 19). The front stop rib 23 and the rear stop rib 24 clamp the water tank heating conversion circuit board 5 from both the front and rear directions, thus limiting the water tank heating conversion circuit board 5. When the main unit heating conversion circuit board 4 is connected to the water tank heating conversion circuit board 5, the spring inside the contact protrusion 9 compresses and generates a thrust on the water tank heating conversion circuit board 5. The front stop rib 23 and the rear stop rib 24 can prevent the water tank heating conversion circuit board 5 from loosening.

[0085] like Figure 13 , Figure 14 and Figure 15As shown, a sealing rib plate 26 is provided inside the base 14. The sealing rib plate 26 has a ring structure, which surrounds the water tank heating conversion circuit board 5, the third connector 18 of the heating aluminum substrate 6, and other circuit components, as well as the cables and adapters between them, all within the ring structure. Below the sealing rib plate 26, a sealing ring 27 matching its shape is provided. During installation, the bottom cover 19 presses against the sealing ring 27, so that the bottom cover 19, the sealing rib plate 26, the top cover of the base 14, the back of the heating aluminum substrate 16, and the sealing ring 22 of the connecting metal pillar together form a sealed space, keeping the circuit within the sealed space dry. On the bottom cover 19, outside the range of the sealing rib plate 26, multiple drainage holes 25 are provided, so that even if there is water in other areas of the base 14 temporarily, it will flow out through these drainage holes 25 and will not remain in the machine for a long time.

[0086] A temperature sensor is installed on the back of the heating aluminum substrate 6 located at the bottom of the water tank 2. When the temperature of the heating aluminum substrate 6 rises to a certain temperature, the fuse in the heating circuit blows, cutting off the heating power supply and preventing dry burning.

[0087] This application also includes a ventilator that includes the aforementioned direct heating system.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application, and should all be covered within the scope of the claims of this application.

Claims

1. A direct heating system for heating water in a ventilator's water tank, characterized in that, The system includes: a sheet-like heated aluminum substrate; The bottom of the ventilator water tank has an opening that is the same shape as the heating aluminum substrate but slightly smaller in size. The heating aluminum substrate is located below the opening at the bottom of the water tank of the ventilator. Its front side is in direct contact with the water to be heated, and its back side is provided with an electric heating element and a third connector. The third connector is used to connect to a power source. The heating aluminum substrate is wrapped by an aluminum substrate silicone sleeve; a first hole is opened in the direction of the aluminum substrate silicone sleeve covering the front of the heating aluminum substrate; except for the edges which are covered by the aluminum substrate silicone sleeve, the rest of the front of the heating aluminum substrate is exposed through the first hole; a second hole is opened in the direction of the aluminum substrate silicone sleeve covering the back of the heating aluminum substrate; a third connector of the heating aluminum substrate is exposed through the second hole. The first hole edge of the silicone sleeve on the aluminum substrate has a sealing rib; the bottom of the ventilator water tank has a clamping rib at the position corresponding to the sealing rib; the clamping rib clamps the sealing rib to prevent water leakage from the ventilator water tank. The system also includes a water tank heating conversion circuit board; The water tank heating conversion circuit board includes a water tank heating conversion circuit board body, a second connector, and a connecting metal post; The water tank heating conversion circuit board is located below the ventilator main unit, vertically fixed in the base, with the connecting metal column on top and the second connector on the bottom; The upper part of the base extends into a connecting metal column protruding shaft; the connecting metal column protruding shaft wraps around the cylindrical surface of the connecting metal column and exposes the end face of the connecting metal column; the end face of the connecting metal column is recessed into the connecting metal column protruding shaft. The connecting metal column near the water tank heating conversion circuit board body is tightly wrapped by the connecting metal column sealing ring; the contact points between the connecting metal column sealing ring and the connecting metal column, the water tank heating conversion circuit board body and the connecting metal column protruding shaft are all interference fits to prevent water from seeping into the base from the gap between the connecting metal column and the connecting metal column protruding shaft.

2. The direct heating system according to claim 1, characterized in that, The second connector and the connecting metal post are fixed on the same side of the water tank heating conversion circuit board body; the second connector and the connecting metal post are electrically connected through the circuit inside the water tank heating conversion circuit board body. The second and third connectors are electrically connected via cables and adapters; The connecting metal post is used to connect to the power supply.

3. The direct heating system according to claim 2, characterized in that, The system also includes a main unit heating conversion circuit board located at the bottom of the ventilator main unit; The host heating conversion circuit board includes a host heating conversion circuit board body, a first connector, a spring pin connector, and a contact protrusion; The first connector is fixed to the main heating conversion circuit board body; the contact protrusion is fixed to the opposite end of the main heating conversion circuit board body on the same side as the first connector through a spring pin connector; The first connector is used to connect to a power source; The contact protrusion has a cylindrical structure and a built-in spring. When the main heating conversion circuit board is connected to the water tank heating conversion circuit board, the contact protrusion and the head of the connecting metal column of the water tank heating conversion circuit board are in close contact one-to-one in the axial direction, and the spring is compressed by force.

4. The direct heating system according to claim 3, characterized in that, The system also includes a sealing surrounding stiffener plate of an annular structure located in the base; Below the sealing rib, a sealing ring matching its shape is provided; the bottom cover of the ventilator presses the sealing ring of the sealing rib, so that the bottom cover of the ventilator, the sealing rib, the top cover of the base, the back of the heated aluminum substrate and the sealing ring of the connecting metal column together form a sealed space. The water tank heating conversion circuit board, the third connector of the heating aluminum substrate and other circuit components, as well as the cables and adapters between the water tank heating conversion circuit board and the heating aluminum substrate, are located in the sealed space.

5. The direct heating system according to claim 4, characterized in that, Multiple drainage holes are provided on the bottom cover of the ventilator outside the area surrounded by the annular structure of the sealing and surrounding stiffener.

6. The direct heating system according to claim 3, characterized in that, The first connector, the second connector, and the third connector are 5-pin connectors.

7. The direct heating system according to claim 2, characterized in that, The ventilator has a front stop rib on the bottom cover and a rear stop rib on the base; the front and rear stop ribs clamp the water tank heating conversion circuit board from both directions.

8. The direct heating system according to claim 1, characterized in that, The system also includes a temperature sensor located on the back of the heated aluminum substrate; when the temperature sensor detects that the temperature of the heated aluminum substrate exceeds a set threshold, the system cuts off the power supply to the heated aluminum substrate.

9. A ventilator, characterized in that, The ventilator includes the system as described in any one of claims 1-8.

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