Breathing type fresh air device with heating function

Abstract

The invention provides a breathing type fresh air device with a heating function. The breathing type fresh air device comprises a shell, a cover body, a mask and a connecting hose. A hot air supply assembly is fixed in the shell, an air inlet channel is formed in the bottom of the shell, the lower end of the air inlet channel is connected with an air filtering assembly, the air inlet end of the hot air supply assembly is connected with the upper end of the air inlet channel, and the air outlet end of the hot air supply assembly extends out of the shell and is connected with one end of a connecting hose. The other end of the connecting hose is fixed to the inner wall of the mask, two air outlet pipes are arranged at the other end of the connecting hose, the two air outlet pipes are used for being inserted into one of the nostrils of a user respectively, two straps which are symmetrically arranged left and right are fixed to the outer wall of the rear side of the shell, and the cover body is fixed to an opening in the upper end of the shell; according to the air purifier, particulate matters in air can be filtered, and the air can be preheated, so that a user can inhale clean and warm air, and the use comfort of the user can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of breathing type fresh air devices, and in particular to a breathing type fresh air device with a heating function. Background Art

[0002] At present, China Patent Publication No.: CN212941055U discloses a fresh air breathing device, which includes a breathing mask, a purifier assembly and a power supply assembly, wherein the breathing mask includes a mask body, a breathing valve is provided on the mask body below the nostrils, an air guide cavity is provided in the mask body, a fresh air inlet connected to the air guide cavity is provided at the lower part of the mask body, and a fresh air outlet connected to the air guide cavity is provided on the inner side of the mask body above the nostrils; although the fresh air breathing device can filter viruses and prevent haze, in a cold environment, since the fresh air breathing device lacks the function of preheating the air, when the user uses it in a cold environment, it is easy to cause discomfort such as shortness of breath due to inhaling cold air for a long time. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a breathing fresh air device with a heating function, which can not only filter particulate matter in the air, but also preheat the air, so that users can inhale clean and warm air, thereby improving the comfort of users when using it.

[0004] The present invention provides a breathing fresh air device with a heating function, comprising a shell body, a cover body, a mask and a connecting hose; a hot air supply assembly is fixed inside the shell body, an air inlet channel is provided at the bottom of the shell body, the lower end of the air inlet channel is connected to an air filter assembly, the air inlet end of the hot air supply assembly is connected to the upper end of the air inlet channel, the air outlet end of the hot air supply assembly extends out of the shell body and is connected to one end of the connecting hose, the other end of the connecting hose is fixed to the inner wall of the mask, two air outlet pipes are provided on the other end of the connecting hose, the two air outlet pipes are respectively used to be inserted into one of the nostrils of the user, two shoulder straps symmetrically arranged on the rear outer wall of the shell body are fixed, and the cover body is fixed at the opening at the upper end of the shell body.

[0005] The present invention can not only filter the particulate matter in the air, but also preheat the air, so that the user can inhale clean and warm air, thereby improving the comfort of the user during use.

[0006] In a possible embodiment, the hot air supply component includes a fan, an air duct, an electric heating unit, a battery, a controller, a power switch, a touch screen and a temperature sensor; the air inlet side of the fan is connected to the upper end of the air inlet channel, the air inlet end of the air duct is connected to the air outlet side of the fan, and the air outlet end of the air duct extends out of the shell and is connected to one end of the connecting hose; the electric heating unit is installed on the inner side of the air duct, the temperature sensor is installed on the side wall of the air duct between the electric heating unit and the connecting hose, and the temperature sensing end of the temperature sensor extends into the air duct; the battery and the controller are both fixed inside the shell, the power switch and the touch screen are both fixed on the side wall of the shell, the controller is electrically connected to the battery after being connected in series with the power switch, and the fan, the electric heating unit, the temperature sensor and the touch screen are all electrically connected to the controller; by adopting this hot air supply component, when the power switch is turned on, the controller can be powered on, at this time, the touch screen can be operated to simultaneously start the fan and the electric heating unit, and when the fan is working, The air in the external environment can flow through the air filter component for filtration and enter the air inlet channel. The air entering the air inlet channel can enter the air duct. At the same time, the electric heating unit can heat the air entering the air duct. Subsequently, the heated air can enter the two air outlet ducts through the connecting hose and finally be discharged through the air outlet duct. Since the two air outlet ducts are inserted into the user's nostrils, the user's nasal cavity can be supplied with air filtered by the air filter component and heated by the electric heating unit. In addition, the user can set the heating temperature of the air entering the air duct by the electric heating unit through the touch screen, and the temperature sensor can monitor the temperature of the air heated by the electric heating unit in real time, that is, under the cooperation of the controller and the temperature sensor, the electric heating unit can control the heating temperature of the air entering the air duct at the user's set temperature, that is, the constant temperature air can enter the user's nasal cavity after the connecting hose and the air outlet duct.

[0007] In a possible implementation, a charging interface is also fixed on the side wall of the shell, and the charging interface is electrically connected to the battery; by adopting this structure, under the action of the charging interface, when the charging interface is connected to the charger, the battery can be easily charged.

[0008] In a possible embodiment, the electric heating unit includes a support rod, a mica insulation sleeve and an electric heating wire; the support rod, the mica insulation sleeve and the electric heating wire are all arranged inside the air duct, the upper end of the support rod is fixed to the top of the shell, the mica insulation sleeve is sleeved on the outside of the support rod and fixed to the support rod, the electric heating wire is wrapped around the outer wall of the mica insulation sleeve, and the two terminal ends of the electric heating wire pass through the air duct and extend out of the air duct and are electrically connected to the controller; by adopting this electric heating unit, the mica insulation sleeve can be reliably fixed to the inside of the air duct through the support rod, and the mica insulation sleeve can reliably support the electric heating wire. When the electric heating wire is energized, the air entering the air duct can be heated, and the electric heating unit has the advantage of simple structure.

[0009] In a possible implementation, a limit block is provided at the upper end of the support rod, and a limit groove is provided on the inner top of the air duct, the limit block is partially embedded in the limit groove from bottom to top and is circumferentially limited by the limit groove; a screw is vertically provided at the upper end of the limit block, the screw and the support rod are coaxially arranged, the upper end of the screw movably passes through the top of the air duct and then extends out of the air duct and is threadedly connected with a first locking nut; after adopting this structure, since the limit block is partially embedded in the limit groove and circumferentially limited, when the first locking nut is threadedly connected to the screw, it can avoid the support rod from being relatively moved. The rotation of the air duct can facilitate the tightening of the threads of the first locking nut and the screw; furthermore, the limit block can be a square, rectangular or regular hexagonal structure, and the shape of the limit groove is adapted to the shape of the limit block; in addition, since the limit block is partially embedded in the limit groove from bottom to top, a gap can be left between the mica insulation sleeve and the inner top of the air duct, that is, a gap can be left between the heating wire and the inner top of the shell, that is, when the heating wire is energized to generate heat, overheating and deformation of the inner top of the air duct can be avoided, thereby avoiding damage to the air duct.

[0010] In a possible embodiment, the lower end of the support rod extends out of the mica insulation sleeve and is threadedly connected with a second locking nut, the upper end of the mica insulation sleeve abuts against the lower end surface of the limit block and a gap is left between the upper end and the inner top of the air duct, and the lower end of the mica insulation sleeve abuts against the second locking nut; after adopting this structure, under the action of the second locking nut, the mica insulation sleeve can be reliably pressed between the limit block and the second locking nut, that is, the mica insulation sleeve can be reliably fixed on the support rod; and because the limit block is partially embedded in the limit groove from bottom to top, the upper end of the mica insulation sleeve abuts against the lower end surface of the limit block and a gap is left between the inner top of the air duct, so that when the heating wire is energized and heated, overheating and deformation of the inner top of the air duct can be avoided, thereby avoiding damage to the air duct.

[0011] In a possible embodiment, a spiral groove is provided on the outer peripheral wall of the mica thermal insulation sleeve, the heating wire is wound on the spiral groove, and the outer edge of the heating wire protrudes out of the spiral groove along the radial direction of the mica thermal insulation sleeve; by adopting this structure, the heating wire can be reliably wound on the outer wall of the mica thermal insulation sleeve, that is, the axial movement of the heating wire relative to the mica thermal insulation sleeve can be avoided, that is, the fixing firmness and reliability of the heating wire and the mica thermal insulation sleeve can be improved.

[0012] In a possible embodiment, a mounting hole is provided on the side wall of the air duct between the electric heating unit and the connecting hose, the temperature sensing end of the temperature sensor extends into the air duct through the mounting hole, and the temperature sensor is threadedly connected to the mounting hole; by adopting this structure, the temperature sensor can be reliably and conveniently fixed on the side wall of the air duct.

[0013] In a possible embodiment, a connecting joint is provided on one end of the connecting hose, and the connecting joint is sleeved on the air outlet end of the air duct and tightly fits with the air outlet end of the air duct; through the setting of the connecting joint, since the connecting joint is sleeved on the air outlet end of the air duct and tightly fits with the air outlet end of the air duct, one end of the connecting hose can be reliably and conveniently connected to the air outlet end of the air duct.

[0014] In one possible embodiment, the air filter assembly includes an end cover and a filter element; an annular boss is vertically arranged on the outer bottom of the shell, the air inlet channel is located on the inner side of the annular boss, a grille hole is arranged on the bottom of the end cover, the filter element is embedded in the inner bottom of the end cover, the side of the end cover is sleeved on the annular boss and is threadedly connected to the annular boss, and the filter element is pressed on the lower end of the annular boss through the end cover; after adopting this air filter assembly, after the end cover is threadedly connected to the annular boss, the filter element can be reliably pressed on the lower end of the annular boss, and when the air flows through the grille hole and the filter element, the filter element can filter the particulate matter in the air, thereby preventing the particulate matter in the air from entering the air inlet channel, that is, preventing the particulate matter from being inhaled by the user; in addition, after the filter element has been used for a period of time, the end cover can be unscrewed and the filter element on the center can be replaced. After the filter element is replaced, the end cover can be screwed onto the annular step. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the rear view structure of the present invention after removing the mask and the connecting hose;

[0017] Figure 3 This is a schematic cross-sectional view of the present invention without the mask and the connecting hose;

[0018] Figure 4 for Figure 3 Schematic diagram of the structure after enlargement at A in the middle. DETAILED DESCRIPTION

[0019] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0020] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0021] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] See also Figure 1-4 As shown, the embodiment of the present application discloses a breathing fresh air device with a heating function, including a shell body 1, a cover body 2, a mask 3 and a connecting hose 4; a hot air supply component is fixed inside the shell body 1, and an air inlet channel 11 is provided at the bottom of the shell body 1, and the lower end of the air inlet channel 11 is connected to an air filter component, the air inlet end of the hot air supply component is connected to the upper end of the air inlet channel 11, and the air outlet end of the hot air supply component extends out of the shell body 1 and is connected to one end of the connecting hose 4, and the other end of the connecting hose 4 is fixed to the inner wall of the mask 3, and two air outlet pipes 41 are provided on the other end of the connecting hose 4, and the two air outlet pipes 41 are respectively used to be inserted into one of the nostrils of the user, and two shoulder straps 12 symmetrically arranged on the rear outer wall of the shell body 1 are fixed, and the cover body 2 is fixed at the opening at the upper end of the shell body 1.

[0024] When using the present invention, the air filter component can filter particulate matter in the air that is about to enter the air inlet channel, and the air after entering the air inlet channel can be heated by the hot air supply component. Subsequently, the clean and warm air can be transported to the two air outlet pipes through the connecting hose. Since the two air outlet pipes are respectively inserted into one of the nostrils of the user, the user can inhale clean and warm air; furthermore, with the help of two shoulder straps, the user can carry the present invention on his shoulders, which can make the carrying of the present invention convenient; in addition, in order to avoid damage to the nasal cavity during the insertion of the air outlet pipe into the user's nasal cavity, the end of each air outlet pipe away from the connecting hose is a hollow spherical structure.

[0025] The hot air supply assembly includes a fan 51, an air duct 52, an electric heating unit, a battery 53, a controller 54, a power switch 55, a touch screen 56 and a temperature sensor 57; the air inlet side of the fan 51 is connected to the upper end of the air inlet channel 11, the air inlet end of the air duct 52 is connected to the air outlet side of the fan 51, and the air outlet end of the air duct 52 extends out of the housing 1 and is connected to one end of the connecting hose 4; the electric heating unit is installed on the inner side of the air duct 52, and the temperature sensor 57 is installed on the air duct between the electric heating unit and the connecting hose 4 The temperature sensing end of the temperature sensor 57 is inserted into the air duct 52; the battery 53 and the controller 54 are fixed inside the housing 1, the power switch 55 and the touch screen 56 are fixed on the side wall of the housing 1, the controller 54 is connected in series with the power switch 55 and is electrically connected to the battery 53, the fan 51, the electric heating unit, the temperature sensor 57 and the touch screen 56 are all electrically connected to the controller 54; by adopting this hot air supply component, when the power switch is turned on, the controller can be powered on, at this time, the touch screen can be operated The user can use the touch screen to start the fan and the electric heating unit at the same time. When the fan is working, the air in the external environment can flow through the air filter component to be filtered and enter the air inlet channel. The air entering the air inlet channel can enter the air duct. At the same time, the electric heating unit can heat the air entering the air duct. Subsequently, the heated air can enter the two air outlet pipes through the connecting hose and finally be discharged through the air outlet pipe. Since the two air outlet pipes are inserted into the user's nostrils, the user's nasal cavity can be supplied with air filtered by the air filter component and heated by the electric heating unit. In addition, the user can set the heating temperature of the air entering the air duct by the electric heating unit through the touch screen, and the temperature sensor can monitor the temperature of the air heated by the electric heating unit in real time, that is, under the cooperation of the controller and the temperature sensor, the electric heating unit can control the heating temperature of the air entering the air duct at the user's set temperature, that is, the constant temperature air can enter the user's nasal cavity after the connecting hose and the air outlet pipe.

[0026] A charging interface 58 is also fixed on the side wall of the housing 1, and the charging interface 58 is electrically connected to the battery 53; by adopting this structure, under the action of the charging interface, when the charging interface is connected to the charger, the battery can be easily charged.

[0027] The electric heating unit includes a support rod 61, a mica insulation sleeve 62 and an electric heating wire 63; the support rod 61, the mica insulation sleeve 62 and the electric heating wire 63 are all arranged inside the air duct 52, the upper end of the support rod 61 is fixed to the top of the shell 1, the mica insulation sleeve 62 is sleeved on the outside of the support rod 61 and fixed to the support rod 61, the electric heating wire 63 is wound on the outer wall of the mica insulation sleeve 62, and the two terminal ends of the electric heating wire 63 penetrate the air duct 52 and then extend out of the air duct 52 and are electrically connected to the controller 54; by adopting this electric heating unit, the mica insulation sleeve can be reliably fixed to the inside of the air duct through the support rod, the mica insulation sleeve can reliably support the electric heating wire, and when the electric heating wire is energized, the air entering the air duct can be heated, and the electric heating unit has the advantage of simple structure.

[0028] A limiting block 611 is provided at the upper end of the support rod 61, and a limiting groove 521 is provided on the inner top of the air duct 52. The limiting block 611 is partially embedded in the limiting groove 521 from bottom to top and is circumferentially limited by the limiting groove 521; a screw rod 612 is vertically provided at the upper end of the limiting block 611, and the screw rod 612 is coaxially arranged with the support rod 61. The upper end of the screw rod 612 movably penetrates the top of the air duct 52 and then extends out of the air duct 52 and is threadedly connected with a first locking nut 613; after adopting this structure, since the limiting block is partially embedded in the limiting groove and is circumferentially limited, the first locking nut and the screw thread connection When connected, it can prevent the support rod from rotating relative to the air duct, that is, it can facilitate the tightening of the threads of the first locking nut and the screw; furthermore, the limit block can be a square, rectangular or regular hexagonal structure, and the shape of the limit groove is adapted to the shape of the limit block; in addition, since the limit block is partially embedded in the limit groove from bottom to top, a gap can be left between the mica insulation sleeve and the inner top of the air duct, that is, a gap can be left between the heating wire and the inner top of the shell, that is, when the heating wire is energized to generate heat, overheating and deformation of the inner top of the air duct can be avoided, thereby avoiding damage to the air duct.

[0029] The lower end of the support rod 61 extends out of the mica insulation sleeve 62 and is threadedly connected with a second locking nut 614. The upper end of the mica insulation sleeve 62 abuts against the lower end surface of the limit block 611 and leaves a gap between the inner top of the air duct 52, and the lower end of the mica insulation sleeve 62 abuts against the second locking nut 614; by adopting this structure, under the action of the second locking nut, the mica insulation sleeve can be reliably compressed between the limit block and the second locking nut, that is, the mica insulation sleeve can be reliably fixed on the support rod; and because the limit block is partially embedded in the limit groove from bottom to top, the upper end of the mica insulation sleeve abuts against the lower end surface of the limit block and leaves a gap between the inner top of the air duct, so that when the heating wire is energized to generate heat, the inner top of the air duct can be prevented from overheating and deformation, thereby preventing damage to the air duct.

[0030] A spiral groove 621 is provided on the outer peripheral wall of the mica thermal insulation sleeve 62, and the heating wire 63 is wound on the spiral groove 621. The outer edge of the heating wire 63 protrudes from the spiral groove 621 along the radial direction of the mica thermal insulation sleeve 62. By adopting this structure, the heating wire can be reliably wound on the outer wall of the mica thermal insulation sleeve, that is, the axial movement of the heating wire relative to the mica thermal insulation sleeve can be avoided, that is, the fixing firmness and reliability of the heating wire and the mica thermal insulation sleeve can be improved.

[0031] A mounting hole 522 is provided on the side wall of the air duct 52 located between the electric heating unit and the connecting hose 4. The temperature sensing end of the temperature sensor 57 extends into the air duct 52 through the mounting hole 522, and the temperature sensor 57 is threadedly connected to the mounting hole 522. By adopting this structure, the temperature sensor can be reliably and conveniently fixed on the side wall of the air duct.

[0032] A connecting joint 41 is provided on one end of the connecting hose 4, and the connecting joint 41 is sleeved on the air outlet end of the air duct 52 and tightly fits with the air outlet end of the air duct 52; through the setting of the connecting joint, since the connecting joint is sleeved on the air outlet end of the air duct and tightly fits with the air outlet end of the air duct, one end of the connecting hose can be reliably and conveniently connected to the air outlet end of the air duct.

[0033] The air filter assembly includes an end cover 71 and a filter element 72; an annular boss 13 is vertically arranged on the outer bottom of the shell 1, the air inlet channel 11 is located on the inner side of the annular boss 13, and a grille hole 711 is arranged on the bottom of the end cover 71. The filter element 72 is embedded in the inner bottom of the end cover 71, and the side of the end cover 71 is sleeved on the annular boss 13 and threadedly connected with the annular boss 13, and the filter element 72 is pressed on the lower end of the annular boss 13 through the end cover 71; after adopting this air filter assembly, after the end cover is threadedly connected to the annular boss, the filter element can be reliably pressed on the lower end of the annular boss, and when the air flows through the grille hole and the filter element, the filter element can filter the particulate matter in the air, thereby preventing the particulate matter in the air from entering the air inlet channel, that is, preventing the particulate matter from being inhaled by the user; in addition, after the filter element has been used for a period of time, the end cover can be unscrewed and the filter element on the center can be replaced. After the filter element is replaced, the end cover can be screwed onto the annular step.

[0034] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A breathing fresh air device with heating function, characterized in that: The invention comprises a shell (1), a cover (2), a mask (3) and a connecting hose (4); a hot air supply assembly is fixed inside the shell (1); an air inlet channel (11) is arranged at the bottom of the shell (1); the lower end of the air inlet channel (11) is connected to an air filter assembly; the air inlet end of the hot air supply assembly is connected to the upper end of the air inlet channel (11); the air outlet end of the hot air supply assembly extends out of the shell (1) and is connected to one end of a connecting hose (4); the other end of the connecting hose (4) is fixed to the inner wall of the mask (3); two air outlet pipes (41) are arranged on the other end of the connecting hose (4); the two air outlet pipes (41) are respectively used to be inserted into one of the nostrils of the user; two shoulder straps (12) arranged symmetrically on the rear outer wall of the shell (1) are fixed; and the cover (2) is fixed to the opening at the upper end of the shell (1).

2. The breathing fresh air device with heating function according to claim 1 is characterized in that: The hot air supply assembly comprises a fan (51), an air duct (52), an electric heating unit, a storage battery (53), a controller (54), a power switch (55), a touch screen (56) and a temperature sensor (57); the air inlet side of the fan (51) is connected to the upper end of the air inlet channel (11), the air inlet end of the air duct (52) is connected to the air outlet side of the fan (51), the air outlet end of the air duct (52) extends out of the housing (1) and is connected to one end of the connecting hose (4); the electric heating unit is installed on the inner side of the air duct (52), and the temperature sensor (57) is connected to the upper end of the air inlet channel (11). ) is installed on the side wall of the air duct (52) between the electric heating unit and the connecting hose (4), and the temperature sensing end of the temperature sensor (57) extends into the air duct (52); the battery (53) and the controller (54) are both fixed inside the housing (1), the power switch (55) and the touch screen (56) are both fixed on the side wall of the housing (1), the controller (54) is connected in series with the power switch (55) and is electrically connected to the battery (53), and the fan (51), the electric heating unit, the temperature sensor (57) and the touch screen (56) are all electrically connected to the controller (54).

3. The breathing fresh air device with heating function according to claim 2 is characterized in that: A charging interface (58) is also fixed on the side wall of the housing (1), and the charging interface (58) is electrically connected to the storage battery (53).

4. The breathing fresh air device with heating function according to claim 2 is characterized in that: The electric heating unit comprises a support rod (61), a mica heat insulation sleeve (62) and an electric heating wire (63); the support rod (61), the mica heat insulation sleeve (62) and the electric heating wire (63) are all arranged inside the air duct (52); the upper end of the support rod (61) is fixed to the top of the shell (1); the mica heat insulation sleeve (62) is sleeved on the outside of the support rod (61) and fixed to the support rod (61); the electric heating wire (63) is wound on the outer wall of the mica heat insulation sleeve (62); the two wiring ends of the electric heating wire (63) penetrate the air duct (52) and then extend out of the air duct (52) and are electrically connected to the controller (54).

5. The breathing fresh air device with heating function according to claim 4 is characterized in that: A limit block (611) is arranged at the upper end of the support rod (61), and a limit groove (521) is arranged on the inner top of the air duct (52); the limit block (611) is partially embedded in the limit groove (521) from bottom to top and is circumferentially limited with the limit groove (521); a screw rod (612) is vertically arranged at the upper end of the limit block (611); the screw rod (612) is coaxially arranged with the support rod (61); the upper end of the screw rod (612) movably penetrates the top of the air duct (52) and then extends out of the air duct (52) and is threadedly connected with a first locking nut (613).

6. The breathing fresh air device with heating function according to claim 5 is characterized in that: The lower end of the support rod (61) extends out of the mica insulation sleeve (62) and is threadedly connected to a second locking nut (614); the upper end of the mica insulation sleeve (62) abuts against the lower end surface of the limit block (611) and leaves a gap with the inner top of the air duct (52); the lower end of the mica insulation sleeve (62) abuts against the second locking nut (614).

7. The breathing fresh air device with heating function according to any one of claims 4 to 6, characterized in that: A spiral groove (621) is provided on the outer peripheral wall of the mica thermal insulation sleeve (62), the heating wire (63) is wound on the spiral groove (621), and the outer edge of the heating wire (63) protrudes from the spiral groove (621) along the radial direction of the mica thermal insulation sleeve (62).

8. The breathing fresh air device with heating function according to claim 2 is characterized in that: A mounting hole (522) is provided on the side wall of the air duct (52) between the electric heating unit and the connecting hose (4); the temperature sensing end of the temperature sensor (57) extends into the air duct (52) through the mounting hole (522); and the temperature sensor (57) is threadedly connected to the mounting hole (522).

9. The breathing fresh air device with heating function according to claim 2 is characterized in that: A connecting joint (41) is provided on one end of the connecting hose (4), and the connecting joint (41) is sleeved on the air outlet end of the air guide pipe (52) and tightly matched with the air outlet end of the air guide pipe (52).

10. The breathing fresh air device with heating function according to claim 1, characterized in that: The air filter assembly comprises an end cover (71) and a filter element (72); an annular boss (13) is vertically arranged on the outer bottom of the shell (1); the air inlet channel (11) is located on the inner side of the annular boss (13); a grille hole (711) is arranged on the bottom of the end cover (71); the filter element (72) is embedded in the inner bottom of the end cover (71); the side of the end cover (71) is sleeved on the annular boss (13) and is threadedly connected to the annular boss (13); the filter element (72) is pressed against the lower end of the annular boss (13) through the end cover (71).

Images