A heater and a method of operating the same

Abstract

The present application relates to the technical field of heating equipment, in particular to a kind of warmer and its operating method, external air is sequentially via air inlet, air inlet and dust filter net air intake and filter dust, after filtering dust, external air is via air inlet, heating element, air supply cavity, under the action of fan wheel, blow out, air inlet one end is the design of elastic telescopic structure, initial state, air inlet and one end air inlet are communicated, the head of air inlet is elastically inserted into air inlet, and abuts on dust filter net, with the continuous accumulation of impurities and dust on dust filter net, the pressure of air intake is bound to be more and more big, until dust filter net is pressed into air inlet, to promote air inlet to move out of air inlet, trigger circular inner ring rotation, until the air inlet of other end is turned to air inlet, so that the standby dust filter net can continue to participate in air intake and filter dust, so as to affect air intake heating, and the dust filter net accumulated with impurities and dust is turned to cleaning position, and is cleaned and maintained, so as not to affect the normal use of warmer.

Description

Technical Field

[0001] This invention relates to the field of heating equipment technology, and in particular to a heater and its operating method. Background Technology

[0002] There are many types of heating devices on the market, among which fan heaters using PTC ceramic heating elements are highly safe and provide gentle airflow. For example, Chinese patent document CN110230838B discloses a PTC heating type heater, which includes a shell with an air duct inside. The shell has an air inlet connected to the air duct, and PTC ceramic heating elements and a fan are arranged sequentially along the path extending from the air inlet into the shell, dispersing air from all sides. However, like other PTC ceramic heaters on the market, it is not suitable for use in dirty or dusty environments. After prolonged use, dust and impurities can easily accumulate at the return air vent, affecting the heating effect. To address this, existing technologies, such as the automatic dust cleaning device and heater disclosed in Chinese patent document CN115382317A, include a brush for contacting the dust filter. The brush and the dust filter are configured to move relative to each other, so that the brush cleans the dust filter during their relative movement and the dust is then sucked away by a vacuum device. This allows for automatic cleaning of the dust filter. However, on the one hand, there are issues with the timing of the brush cleaning the filter, and on the other hand, the brush cleaning process inevitably affects the air supply. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a heater and its operating method to solve the problem that impurities and dust easily accumulate at the return air vent, affecting the heating effect.

[0004] To achieve the above objectives, the present invention provides a heater, including a housing, an air duct inside the housing, a heating element and a fan connected to the air duct, and further comprising:

[0005] The outer frame has an inner ring in the middle, the shell is fixedly connected to the inner ring, the inner ring of the outer frame is movably connected to a circular inner ring, the two ends of the circular inner ring are respectively opened to air inlets, the air inlets are elastically connected to dust filters, and the upper end of the outer frame is opened to air inlet.

[0006] The air duct includes an air inlet duct at one end of the housing and an air supply chamber at the front of the housing. The impeller is located in the air supply chamber, and the heating element is connected between the air supply chamber and the air inlet duct. One end of the air inlet duct has an elastic telescopic structure design. In the initial state, the air inlet is connected to the air inlet at one end. The head end of the air inlet duct elastically extends into the air inlet and abuts against the dust filter until the dust filter presses against the air inlet duct. When the air inlet duct moves out of the air inlet, the circular inner ring rotates, and the air inlet at the other end rotates to the air inlet position.

[0007] Preferably, the air inlet is located at the top of the outer frame; the section of the air inlet duct near the outer frame is designed as an elastic telescopic tube.

[0008] Preferably, an elastic telescopic plate is provided on the inner wall of the air inlet, with the movable end of the elastic telescopic plate facing the inner side of the outer frame and fixedly connected to the dust filter.

[0009] Preferably, an inner ring frame is fixedly connected to the outer ring of the outer frame, the inner ring frame extends toward the inner side of the outer frame and is fixedly connected to the shell.

[0010] Preferably, the outer frame includes a bottom support portion and a bracket portion connected above the bottom support portion, and an annular inner frame is formed in the middle of the bracket portion.

[0011] Preferably, an outer gear ring is wound around the outer side of the circular inner ring, and a main gear is rotatably connected inside the bottom support. The main gear is meshed with the outer gear ring and is used to drive the circular inner ring to rotate.

[0012] Preferably, the housing is provided with an auxiliary air duct, one end of which is connected to the air supply chamber and the other end of which abuts against the dust filter screen. A sliding column is inserted into the auxiliary air duct, and an opening is opened on the sliding column. One end of the sliding column is elastically connected to the housing, and a rack is connected to the side end of the sliding column. An incomplete gear is rotatably connected inside the housing and meshes with the rack to drive the sliding column to move laterally back and forth so that the opening circulates into and out of the auxiliary air duct. A dust removal port is opened on the outer frame at one end relative to the air inlet, and a dust collection chamber is provided in the bottom support. In the initial state, the dust collection chamber is connected to the bottom of the dust removal port.

[0013] Preferably, the inner circular ring is hollow, and multiple air holes are spaced apart on the inner side of the inner circular ring. The inner ring frame closes the air holes. A reserve air bladder is provided inside the shell. One end of the reserve air bladder is connected to the auxiliary air duct, and the other end abuts against the inner end of the inner circular ring. In the initial state, the air holes and the reserve air bladder are not connected.

[0014] Preferably, a distance sensor is provided inside the air inlet to sense the height of the dust filter.

[0015] The present invention also provides a method for operating a heater, comprising the following steps:

[0016] In the initial state, external air enters and is filtered through the air inlet, air outlet, and dust filter in sequence. The filtered external air then passes through the air inlet duct, heating element, and air delivery chamber, and is blown out by the impeller. One end of the air inlet duct has an elastic telescopic structure design. The air inlet is connected to the upper air inlet. The head end of the air inlet duct elastically extends into the air inlet and abuts against the dust filter until the dust filter presses against the air inlet duct to push the air inlet duct out of the air outlet. At this point, the distance sensed by the upper distance sensor is stable above the preset value, triggering the inner circular ring to rotate until the lower air inlet rotates to the air outlet position. At the same time, it triggers the slide column to move laterally back and forth to intermittently open and close the auxiliary air duct, causing the lower dust filter to shake up and down until the distance sensed by the lower distance sensor is stable above the preset value, triggering the slide column to stop moving laterally back and forth.

[0017] If the distance sensed by the upper distance sensor is stable above the preset value, while the distance sensed by the lower distance sensor is fluctuating, the heater will be triggered to stop working.

[0018] The beneficial effects of this invention are as follows: External air enters and is filtered through the air inlet, air outlet, and dust filter in sequence. The filtered external air then passes through the air intake duct, heating element, and air supply chamber, and is blown out by the impeller. One end of the air intake duct has an elastic telescopic structure design. In the initial state, the air inlet is connected to the air outlet at one end, and the head end of the air intake duct elastically extends into the air outlet and abuts against the dust filter. As impurities and dust accumulate on the dust filter, the pressure of the incoming air will inevitably increase until the dust filter presses against the air intake duct, pushing the air intake duct out of the air outlet. This triggers the rotation of the inner circular ring until the air outlet at the other end rotates to the air outlet position. Thus, the spare dust filter can continue to participate in the air intake filtration without affecting the air intake heating. The dust filter with accumulated impurities and dust is moved to the cleaning position for cleaning and maintenance, without affecting the normal use of the heater. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a top view of the air inlet of the present invention;

[0022] Figure 3 This is a schematic diagram of the heating element of the present invention;

[0023] Figure 4This is a schematic diagram of the structure of the elastic telescopic plate of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the dust filter of the present invention when it pushes the air inlet duct to move out of the air inlet;

[0025] Figure 6 This is a schematic diagram of the structure of the circular inner ring of the present invention during rotation;

[0026] Figure 7 This is a schematic diagram of the structure of the present invention when the lower air inlet is rotated to the air outlet.

[0027] Figure 8 This is a schematic diagram of the structure of the storage airbag of the present invention;

[0028] Figure 9 This is a schematic diagram of the circular inner ring and air hole structure of the present invention.

[0029] The diagram is marked as follows:

[0030] 1. Housing; 2. Heating element; 3. Impeller; 4. Outer frame; 41. Air inlet; 42. Bottom support; 43. Bracket; 44. Dust removal port; 5. Circular inner ring; 51. Outer gear ring; 52. Air hole; 6. Air inlet; 61. Elastic telescopic plate; 611. Fixed plate; 612. Movable plate; 613. First elastic element; 7. Dust filter; 8. Air inlet duct; 9. Air supply chamber; 10. Inner ring frame; 11. Main gear; 12. Auxiliary air duct; 13. Sliding column; 131. Second elastic element; 14. Through port; 15. Rack; 16. Incomplete gear; 17. Dust collection chamber; 18. Reserve air bag; 19. Distance sensor. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0032] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] like Figures 1 to 5 As shown, a heater and its operating method include a housing 1, an air duct inside the housing 1, a heating element 2 and a fan 3 connected to the air duct, and an outer frame 4. An annular inner frame is formed in the middle of the outer frame 4, and the housing 1 is fixedly connected to the annular inner frame. A circular inner ring 5 is movably connected to the inner ring of the outer frame 4. Air inlets 6 are formed at opposite ends of the circular inner ring 5, and dust filters 7 are elastically connected to the air inlets 6. An air inlet 41 is formed at one end of the outer frame 4. The air duct includes an air inlet duct located at one end of the housing 1. 8, and an air supply cavity 9 located on the front of the housing 1, a fan wheel 3 located in the air supply cavity 9, a heating element 2 connected between the air supply cavity 9 and the air inlet duct 8, one end of the air inlet duct 8 is designed with an elastic telescopic structure. In the initial state, the air inlet 41 is connected to the air inlet 6 at one end, the head end of the air inlet duct 8 elastically extends into the air inlet 6 and abuts against the dust filter 7 until the dust filter 7 presses against the air inlet duct 8 so that when the air inlet duct 8 moves out of the air inlet 6, the circular inner ring 5 rotates, and the air inlet 6 at the other end rotates to the air inlet 41.

[0034] This invention is based on an existing PTC ceramic heater, comprising a shell 1, an air duct inside the shell 1, a heating element 2 and a fan 3 connected to the air duct. Air enters through the air duct, is heated by the heating element 2 (the existing PTC ceramic heating element), and is then blown out by the rotating fan 3 to achieve the heating function. Specifically, this invention also includes an outer frame 4, with an annular inner frame in the middle. The shell 1 is fixedly connected to the annular inner frame. Both the outer frame 4 and the shell 1 of the heating element are fixed in position, with the outer frame 4 providing support and fixation. A circular inner ring 5 is movably connected to the inner circle of the outer frame 4, meaning the circular inner ring 5 can rotate around the shell 1, along the center of the annular inner frame and the shell 1. Air inlets 6 are located at opposite ends of the circular inner ring 5, with a dust filter 7 elastically connected to each air inlet 6. An air inlet 41 is located at one end of the outer frame 4. Specifically, the top of the air inlet 41 has a grille-structured air plate, through which external air enters sequentially via the air inlet 41, the air inlet 6, and the dust filter 7. The system incorporates airflow and dust filtration. The air duct includes an air inlet duct 8 located at one end of the housing 1, and an air delivery chamber 9 located on the front of the housing 1. A fan wheel 3 is disposed within the air delivery chamber 9. A heating element 2 is connected between the air delivery chamber 9 and the air inlet duct 8. Thus, filtered external air passes through the air inlet duct 8, the heating element 2, and the air delivery chamber 9, and is blown out under the action of the fan wheel 3. One end of the air inlet duct 8 has an elastic telescopic structure design. In the initial state, the air inlet 41 is connected to the air inlet 6 at one end, and the head end of the air inlet duct 8 elastically extends into the air inlet 6. The dust filter 7 is pressed against the dust filter 7. As impurities and dust accumulate on the dust filter 7, the pressure of the incoming air will inevitably increase until the dust filter 7 presses against the air inlet 8 to push the air inlet 8 out of the air inlet 6. This triggers the inner circular ring 5 to rotate until the air inlet 6 at the other end rotates to the air inlet 41. Thus, the spare dust filter 7 can continue to participate in the air intake dust filtration without affecting the air intake heating. The dust filter 7 with accumulated impurities and dust is moved to the cleaning position for cleaning and maintenance, without affecting the normal use of the heater.

[0035] In embodiments of the present invention, such as Figures 1 to 5 As shown, the air inlet 41 is located at the top of the outer frame 4; the section of the air inlet duct 8 near the outer frame 4 is designed as an elastic telescopic tube. Specifically, one section of the air inlet duct 8 near the outer frame 4 can be designed as an elastic corrugated tube, so that the air inlet duct 8 can be elastically inserted into the air inlet 6 at one end of the air inlet 41 and elastically abut against the dust filter 7.

[0036] In embodiments of the present invention, such as Figures 1 to 5As shown, an elastic telescopic plate 61 is provided on the inner wall of the air inlet 6. The movable end of the elastic telescopic plate 61 faces the inner side of the outer frame 4 and is fixedly connected to the dust filter 7. Specifically, the elastic telescopic plate 61 includes a fixed plate 611 fixedly connected to the inner wall of the air inlet 6 and a movable plate 612 inserted inside the fixed plate 611. A first elastic member 613 is connected between the fixed plate 611 and the movable plate 612. The first elastic member 613 is used to push the movable plate 612 toward the inner side of the outer frame 4 and elastically abut against the air inlet duct 8.

[0037] In embodiments of the present invention, such as Figures 1 to 9 As shown, an inner ring frame 10 is fixedly connected to the outer ring of the outer frame 4. The inner ring frame 10 extends toward the inner side of the outer frame 4 and is fixedly connected to the shell 1. Specifically, the outer side of the inner ring frame 10 is fixedly connected to the outer ring of the outer frame 4, and the inner side of the inner ring frame 10 abuts against and covers the inner ring of the circular inner ring 5, but is not fixedly connected to the circular inner ring 5. The inner side of the inner ring frame 10 is fixedly connected to the shell 1, thereby playing the role of supporting and connecting the circular inner ring 5 and the shell 1, while not affecting the rotation of the circular inner ring 5.

[0038] In embodiments of the present invention, such as Figures 1 to 5 As shown, the outer frame 4 includes a bottom support portion 42 and a bracket portion 43 connected above the bottom support portion 42, and an annular inner frame is opened in the middle of the bracket portion 43.

[0039] In embodiments of the present invention, such as Figures 1 to 9 As shown, an outer gear ring 51 is provided on the outer side of the circular inner ring 5, and a main gear 11 is rotatably connected in the bottom support part 42. The main gear 11 is meshed with the outer gear ring 51. Specifically, a main drive motor is also provided in the bottom support part 42. The main drive motor drives the main gear 11 to rotate, thereby driving the circular inner ring 5 to rotate.

[0040] In embodiments of the present invention, such as Figures 1 to 9As shown, an auxiliary air duct 12 is provided inside the housing 1. The auxiliary air duct 12 is located inside the housing 1 below the air inlet duct 8. One end of the auxiliary air duct 12 is connected to the air outlet of the air supply chamber 9, and the other end abuts against the dust filter 7 below. A sliding column 13 is inserted into the auxiliary air duct 12. The sliding column 13 has an opening 14. One end of the sliding column 13 is elastically connected to the inside of the housing 1. A rack 15 is connected to the side end of the sliding column 13. An incomplete gear 16 is rotatably connected inside the housing 1. The incomplete gear 16 is meshed with the rack 15. Specifically, a second elastic element is connected between one end of the sliding column 13 and the housing 1. 131, the first elastic element 613 and the second elastic element 131 can be existing conventional spring components. An auxiliary drive motor is provided inside the housing 1. The output end of the auxiliary drive motor is connected to the incomplete gear 16. In the initial state, the second elastic element 131 pushes the slide column 13 to slide, and the opening 14 passes through the auxiliary air duct 12. The auxiliary air duct 12 is closed by the slide column 13. When the circular inner ring 5 rotates, it drives the dust filter 7 above to rotate to the auxiliary air duct 12. The auxiliary drive motor drives the incomplete gear 16 to rotate, thereby intermittently driving the slide column 13 to slide and compress the second elastic element 131. The opening 14 passes through the auxiliary air duct. Inside the auxiliary air duct 12, when the missing tooth portion of the incomplete gear 16 rotates to the sliding column 13, it disengages. The sliding column 13 slides back to its original position under the push of the second elastic element 131, thus closing the auxiliary air duct 12. The sliding column 13 then moves laterally back and forth, causing the opening 14 to circulate into and out of the auxiliary air duct 12, achieving the effect of intermittently opening and closing the auxiliary air duct 12. A dust removal port 44 is provided at one end of the outer frame 4 relative to the air inlet 41, and a dust collection chamber 17 is provided inside the bottom support 42. The intermittent opening and closing of the auxiliary air duct 12 intermittently blows the dust filter 7, causing the dust filter 7 to be affected by the airflow. Furthermore, the newly moved lower dust filter 7 has accumulated dust and impurities, causing the dust filter 7 to shake up and down and intermittently collide with the bottom of the auxiliary air duct 12. This blowing and shaking helps to automatically clean the dust and impurities accumulated on the dust filter 7 until the dust and impurities accumulated on the dust filter 7 are cleaned and the dust filter 7 stops shaking. At this point, the auxiliary drive motor is controlled to stop rotating and return to the initial state. The upper dust filter 7 performs dust filtration work, and the lower dust collection chamber 17 is connected to the lower part of the dust cleaning port 44 and disconnected from the air supply chamber 9. The lower dust filter 7 is in a static standby state.

[0041] As another embodiment of the present invention, such as Figures 1 to 9As shown, the inner circular ring 5 is hollow, and multiple air holes 52 are spaced apart on the inner circumference of the inner circular ring 5. The inner ring frame 10 closes the air holes 52. The housing 1 contains a storage air bladder 18. One end of the storage air bladder 18 is connected to the auxiliary air duct 12, and the other end abuts against the inner end of the inner circular ring 5. In the initial state, the air holes 52 are not connected to the storage air bladder 18, so that the air supply cavity 9 can be used to ensure that the storage air bladder 18 is full of air. During the rotation of the inner circular ring 5, the air holes 52 are intermittently connected to the storage air bladder 18 and the air inlet duct 8 to meet the temporary air intake needs of the air inlet duct 8. The air stored in the storage air bladder 18 does not come into contact with the outside world, so there is no problem of dust filtration.

[0042] As another embodiment of the present invention, such as Figure 4 As shown, a distance sensor 19 is provided inside the air inlet 6 to sense the height of the dust filter 7. Preferably, the distance sensor 19 is located inside the fixed plate 611 and directly detects the distance of the movable plate 612.

[0043] The present invention also provides a method for operating a heater, comprising the following steps:

[0044] In the initial state, external air enters and is filtered through the air inlet 41, the air inlet 6, and the dust filter 7 in sequence. The filtered external air is then blown out through the air inlet duct 8, the heating element 2, and the air delivery chamber 9 under the action of the impeller 3. One end of the air inlet duct 8 is designed with an elastic telescopic structure. The air inlet 41 is connected to the upper air inlet 6. The head end of the air inlet duct 8 extends elastically into the air inlet 6 and abuts against the dust filter 7. When the dust filter 7 presses against the air inlet duct 8 to push the air inlet duct 8 out of the air inlet 6, that is, when the distance sensed by the upper distance sensor 19 is stable above the preset value, the inner circular ring 5 is triggered to rotate until the lower air inlet 6 rotates to the air inlet 41. At the same time, the sliding column 13 is triggered to move laterally back and forth to intermittently open and close the auxiliary air duct 12, causing the lower dust filter 7 to shake up and down until the distance sensed by the lower distance sensor 19 is stable above the preset value, triggering the sliding column 13 to stop moving laterally back and forth.

[0045] If the distance sensed by the upper distance sensor 19 is stable above the preset value, while the distance sensed by the lower distance sensor 19 is fluctuating, the heater will be triggered to stop working.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0047] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A heater, comprising a housing (1), wherein the housing (1) is provided with an air duct, and a heating element (2) and a fan (3) connected to the air duct, characterized in that, Also includes: The outer frame (4) has an annular inner frame in the middle. The shell (1) is fixedly connected to the annular inner frame. The inner ring of the outer frame (4) is movably connected to a circular inner ring (5). The two ends of the circular inner ring (5) are respectively provided with air inlets (6). A dust filter (7) is elastically connected to the air inlet (6). An air inlet (41) is provided at one end of the outer frame (4). The air duct includes an air inlet duct (8) located at one end of the housing (1) and an air supply chamber (9) located on the front of the housing (1). The impeller (3) is located in the air supply chamber (9). The heating element (2) is connected between the air supply chamber (9) and the air inlet duct (8). One end of the air inlet duct (8) is designed with an elastic telescopic structure. In the initial state, the air inlet (41) is connected to the air inlet (6) at one end. The head end of the air inlet duct (8) elastically extends into the air inlet (6) and abuts against the dust filter (7) until the dust filter (7) presses against the air inlet duct (8) so that the air inlet duct (8) moves out of the air inlet (6). Then the circular inner ring (5) rotates and the air inlet (6) at the other end rotates to the air inlet (41). The outer frame (4) is fixedly connected to an inner ring frame (10), which extends toward the inner side of the outer frame (4) and is fixedly connected to the shell (1). The outer frame (4) includes a bottom support (42) and a bracket (43) connected above the bottom support (42), and the annular inner frame is opened in the middle of the bracket (43); An auxiliary air duct (12) is provided inside the housing (1). One end of the auxiliary air duct (12) is connected to the air supply chamber (9), and the other end abuts against the dust filter (7). A sliding column (13) is inserted into the auxiliary air duct (12). A through-hole (14) is opened on the sliding column (13). One end of the sliding column (13) is elastically connected to the housing (1). A rack (15) is connected to the side end of the sliding column (13). An incomplete gear (16) is rotatably connected inside the housing (1). The incomplete gear (16) is meshed with the rack (15) to drive the slide column (13) to move laterally back and forth so that the opening (14) moves into and out of the auxiliary air duct (12) in a cycle. A dust removal port (44) is provided on one end of the outer frame (4) relative to the air inlet (41). A dust collection chamber (17) is provided in the bottom support (42). In the initial state, the dust collection chamber (17) is connected to the bottom of the dust removal port (44). The air inlet (6) is equipped with a distance sensor (19) for sensing the height of the dust filter (7).

2. A heater according to claim 1, characterized in that, The air inlet (41) is located at the top of the outer frame (4); the section of the air inlet duct (8) near the outer frame (4) is designed as an elastic telescopic tube.

3. A heater according to claim 1, characterized in that, An elastic telescopic plate (61) is provided on the inner wall of the air inlet (6). The movable end of the elastic telescopic plate (61) faces the inner side of the outer frame (4) and is fixedly connected to the dust filter (7).

4. A heater according to claim 1, characterized in that, An outer gear ring (51) is wound around the outer side of the circular inner ring (5). A main gear (11) is rotatably connected inside the bottom support (42). The main gear (11) is meshed with the outer gear ring (51) to drive the circular inner ring (5) to rotate.

5. A heater according to claim 1, characterized in that, The circular inner ring (5) is hollow. Multiple air holes (52) are spaced apart on the inner side of the circular inner ring (5). The inner ring frame (10) closes the air holes (52). A reserve air bag (18) is provided inside the shell (1). One end of the reserve air bag (18) is connected to the auxiliary air duct (12), and the other end abuts against the inner end of the circular inner ring (5). In the initial state, the air holes (52) are not connected to the reserve air bag (18).

6. A method for operating a heater according to any one of claims 1-5, characterized in that, Includes the following steps: In the initial state, external air enters and is filtered through the air inlet (41), air inlet (6), and dust filter (7) in sequence. The filtered external air then passes through the air inlet duct (8), heating element (2), and air supply chamber (9), and is blown out by the impeller (3). One end of the air inlet duct (8) is designed with an elastic telescopic structure. The air inlet (41) is connected to the air inlet (6) above. The head end of the air inlet duct (8) elastically extends into the air inlet (6) and abuts against the dust filter (7) until the dust filter (7) presses against the air inlet duct (8). When the air inlet (8) is pushed out of the air inlet (6), that is, when the distance sensed by the upper distance sensor (19) is stable above the preset value, the inner ring (5) is triggered to rotate until the lower air inlet (6) is rotated to the air inlet (41). At the same time, the sliding column (13) is triggered to move horizontally back and forth to intermittently open and close the auxiliary air duct (12), causing the lower dust filter (7) to shake up and down until the distance sensed by the lower distance sensor (19) is stable above the preset value, triggering the sliding column (13) to stop moving horizontally back and forth. If the distance sensed by the upper distance sensor (19) is stable above the preset value, while the distance sensed by the lower distance sensor (19) is fluctuating, the heater will be triggered to stop working.

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