Heating device for fresh air system

Abstract

The invention discloses a heating device for a fresh air system, and relates to the technical field of fresh air, the heating device for the fresh air system comprises a fresh air fan, one side of the fresh air fan is fixedly connected with an outlet pipe, one end of the outlet pipe is fixedly connected with a connecting pipe A, and one side of the connecting pipe A is provided with a uniform heating mechanism; by arranging the uniform heating mechanism, when air passes through the multiple heating grooves in the inner wall of the heat conduction cylinder, due to the fact that the area of the inner walls of the heating grooves is large and the number of the inner walls of the heating grooves is large, the air is fully heated and then exhausted, the air heating effect is completed, and more uniform heating and air circulation of the air are completed through the heating grooves in the closed heat conduction cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air, and in particular to a heating device for a fresh air system. Background Art

[0002] Fresh air machine is an effective air purification device that can circulate indoor air. On the one hand, it can exhaust the dirty air indoors to the outside, and on the other hand, it can sterilize, disinfect, filter and other measures to input fresh air outdoors into the room, so that the room is always filled with fresh and clean air.

[0003] A PTC electric heating device for a fresh air system described in a patent application with publication number CN220689219U belongs to the field of fresh air heating. The PTC electric heating device for a fresh air system comprises two air ducts installed at the bottom of a floor slab through angle steel brackets, centrifugal glass wool is installed in the two air ducts, a heating component is detachably installed between the two air ducts, the heating component comprises a heating frame with an open bottom, and two mounting components are arranged on both sides of the heating frame;

[0004] The heating device currently used in the fresh air system usually heats the air by heating a heat sink and then passing the air through the heat sink. However, when the air passes through the heat sink, the contact between the center and the outside air and the heat sink is different, which will cause the air to be heated unevenly after passing through the heat sink. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a heating device for a fresh air system, which achieves the purpose of solving the above-mentioned problems.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A heating device for a fresh air system, comprising a fresh air fan, one side of which is fixedly connected to an outlet pipe, one end of which is fixedly connected to a connecting pipe A, and one side of the connecting pipe A is provided with a uniform heating mechanism;

[0007] The uniform heating mechanism comprises:

[0008] The heater is a circular cylindrical structure, with bearings fixedly connected to the left and right ends of the heater, the left side of the heater is rotatably connected to one end of the connecting pipe A through the bearing located on the left side, and the right side of the heater is rotatably connected to the connecting pipe B through the bearing located on the right side, and a heat transfer plate is fixedly connected to the inner wall of the heater, and the heater is used to heat the heat transfer plate and heat and transfer the air passing through the inside thereof;

[0009] The heat-conducting tube is a columnar structure, a heating groove is provided on the inner wall of the heat-conducting tube, the heating groove is inclined, two fixing rods are fixedly connected to the inner wall of the heating groove, a sliding sleeve is fixedly connected to the outer wall of the fixing rod, an elastic strip is fixedly connected to the outer wall of the sliding sleeve, and the heat-conducting tube is used to allow air to pass through the heating groove inside it to wrap and heat the air.

[0010] Preferably, both ends of the fixing rod are fixedly connected to the inner wall of the heating tank, and one end of the fixing rod away from the sliding sleeve is fixedly connected to a magnetic block.

[0011] Preferably, the sliding sleeve and the magnetic block are magnetic, and the magnetism of the sliding sleeve and the opposite side of the magnetic block is that opposite poles attract each other.

[0012] Preferably, the fixing rods are arranged obliquely on the inner wall of the heating tank, the two fixing rods are in a V shape and are not parallel to each other, and the outer wall of the heater is fixedly connected with a fixing plate.

[0013] Preferably, a pressure relief mechanism is provided at the center of the heating tank, and the pressure relief mechanism comprises a hollow column, the hollow column is fixedly connected at the center of the heating tank, and a connecting cylinder is slidably connected to the inner wall of the hollow column.

[0014] Preferably, a connecting block is fixedly connected to the left end of the connecting cylinder, a circular groove is formed on the inner wall of the connecting block, and a pull plate is fixedly connected to the inner wall of the circular groove.

[0015] Preferably, a ventilation groove is opened on the outer wall of the connecting tube, a round rod is fixedly connected to the right end of the connecting tube, a round plate is fixedly connected to one end of the round rod, and a connecting shaft is fixedly connected to one side of the round plate.

[0016] Preferably, one end of the connecting shaft is fixedly connected to a magnetic plate, the magnetic plate is magnetic on the side opposite to the connecting tube and has opposite poles that attract each other, a spring is fixedly connected to the right side of the hollow column, one end of the spring is fixedly connected to the left side of the circular plate, and the left side of the circular plate is fixedly connected to the right side of the hollow column via a pull rope.

[0017] The present invention provides a heating device for a fresh air system, which has the following beneficial effects:

[0018] 1. The present invention provides a uniform heating mechanism. When the air passes through several heating grooves on the inner wall of the heat-conducting cylinder, the air is fully heated and discharged due to the large inner wall area and large number of heating grooves, thereby achieving the heating effect on the air. Moreover, the heating grooves in the closed heat-conducting cylinder achieve more uniform heating and air circulation.

[0019] 2. The present invention sets a uniform heating mechanism, and by observing the different rotation speeds of the fixed plate, the speed of fresh air passing through the heating slot can be identified, so that the air circulation speed inside can be more intuitively understood, which is convenient for the use of the fresh air system. By observing whether the rotation speed of the fixed plate changes under the same air supply pressure, it can be judged whether there is blockage in the inner wall of the heating slot, and whether the problem of blockage by residues and stains occurs under long-term ventilation conditions, which is convenient for timely cleaning and maintenance.

[0020] 3. The present invention provides a uniform heating mechanism. In order to maintain high-efficiency heating of the air, the heating tank will inevitably be easily clogged with dust. However, when the heating tank in the heat-conducting tube heats the air, the heat-conducting tube rotates automatically, so that once the residual dust particles adhere to the inner wall of the heating tank, they will be immediately thrown out in the centrifugal direction along the inner wall of the heating tank due to the centrifugal inertia of the rotation, thereby reducing the problem of particles adhering to the inner wall of the heating tank and further ensuring the stability of the heating tank in heating the air.

[0021] 4. The present invention sets a uniform heating mechanism to remove the stains on the inner wall of the heating tank. When the heating tank is working, if a large-scale blockage occurs inside the heating tank, the heating tank will be automatically unblocked as the rotation speed decreases. There is no need for manual unblocking, which effectively ensures the heating stability during fresh air ventilation, reduces the workload, and improves efficiency.

[0022] 5. The present invention provides a pressure relief mechanism. When the heating slot is blocked after working for a long time, the ventilation slot is automatically opened, and the air that cannot pass through the heating slot will flow out from the open ventilation slot, thereby avoiding the problem of restricted air circulation due to blockage of the heating slot. The other circulation channels are automatically opened in the high-pressure state under the blockage, thereby avoiding the problem of damage to the fresh air fan due to back pressure under long-term high pressure.

[0023] 6. The present invention provides a pressure relief mechanism to provide the heat-conducting tube and the inner wall of the heating groove with sufficient heat to heat the air under normal working conditions. In the event that the heating groove is blocked unexpectedly, the heat on the heat-conducting tube is quickly transferred to the connecting block through the fitting of the connecting block and the inner wall of the hollow column through the hollow column, and the circular groove and the heating groove are used together to heat the air, so that a large amount of air passing through the circular groove can still maintain a stable heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 The structure of the uniform heating mechanism of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 3 The structure of the uniform heating mechanism of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 4 The cross-sectional structure of the uniform heating mechanism of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 5 The cross-sectional structure of the uniform heating mechanism of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 6 The cross-sectional structure of the uniform heating mechanism of the present invention is shown in FIG. Figure 3 ;

[0030] Figure 7 The cross-sectional structure of the uniform heating mechanism of the present invention is shown in FIG. Figure 4 ;

[0031] Figure 8 The structure of the uniform heating mechanism of the present invention is shown in FIG. Figure 3 ;

[0032] Fig. 9 The structure of the uniform heating mechanism of the present invention is shown in FIG. Figure 4 ;

[0033] Fig.10 The structure of the uniform heating mechanism of the present invention is shown in FIG. Figure 5 ;

[0034] Fig.11 The motion state of the uniform heating mechanism of the present invention is Figure 1 ;

[0035] Fig.12 The motion state of the uniform heating mechanism of the present invention is Figure 2 ;

[0036] Fig.13 The motion state of the uniform heating mechanism of the present invention is Figure 3 ;

[0037] Fig.14 The structure of the pressure relief mechanism of the present invention is shown in FIG. Figure 1 ;

[0038] Fig.15 Schematic diagram of the partial structure of the pressure release mechanism of the present invention Figure 1 ;

[0039] Fig.16 For the present invention Figure 4 A magnified image of point A;

[0040] Fig.17 The structure of the pressure relief mechanism of the present invention is shown in FIG. Figure 2;

[0041] Fig.18 Schematic diagram of the partial structure of the pressure release mechanism of the present invention Figure 2 ;

[0042] Fig.19 The motion state of the pressure release mechanism of the present invention is Figure 1 ;

[0043] Fig. 20 The motion state of the pressure release mechanism of the present invention is Figure 2 .

[0044] In the figure: 1 outlet pipe, 2 fresh air fan, 3 uniform heating mechanism, 301 heater, 302 bearing, 303 heat transfer plate, 304 heat conducting tube, 306 heating groove, 307 fixed plate, 308 fixed rod, 309 sliding sleeve, 310 elastic strip, 311 magnetic block, 4 pressure release mechanism, 401 hollow column, 402 connecting tube, 403 connecting block, 404 circular groove, 405 pull plate, 406 ventilation groove, 407 round rod, 408 round plate, 409 spring, 410 connecting shaft, 411 magnetic plate, 412 pull rope, 5 connecting pipe A, 6 connecting pipe B. DETAILED DESCRIPTION

[0045] Example 1: Please refer to Figure 1-4 The present invention provides a technical solution: a heating device for a fresh air system, comprising a fresh air fan 2, an outlet pipe 1 is fixedly connected to one side of the fresh air fan 2, a connecting pipe A5 is fixedly connected to one end of the outlet pipe 1, and a uniform heating mechanism 3 is arranged on one side of the connecting pipe A5;

[0046] The uniform heating mechanism 3 comprises:

[0047] Heater 301, heater 301 is a circular cylindrical structure, bearings 302 are fixedly connected to the left and right ends of heater 301, the left side of heater 301 is rotatably connected to one end of connecting pipe A5 through the bearing 302 located on the left side, and the right side of heater 301 is rotatably connected to connecting pipe B6 through the bearing 302 located on the right side. A heat transfer plate 303 is fixedly connected to the inner wall of heater 301, and heater 301 is used to heat the heat transfer plate 303 and heat and transfer the air passing through the inside thereof;

[0048] The heat-conducting tube 304 is a columnar structure, and a heating groove 306 is opened on the inner wall of the heat-conducting tube 304. The heating groove 306 is inclined. Two fixing rods 308 are fixedly connected to the inner wall of the heating groove 306. The outer wall of the fixing rod 308 is fixedly connected to a sliding sleeve 309. The outer wall of the sliding sleeve 309 is fixedly connected to an elastic strip 310. The heat-conducting tube 304 is used to allow air to pass through the heating groove 306 inside it to wrap and heat the air.

[0049] When in use, when the fresh air blower 2 is started to circulate fresh air and the air is discharged through the outlet pipe 1, the air discharged from the outlet pipe 1 enters the heater 301 through the connecting pipe A5, and enters the heat-conducting cylinder 304 in the heater 301, passes through the inclined heating groove 306 opened on the inner wall of the heat-conducting cylinder 304, and is discharged through the other side of the heating groove 306, and is discharged from the connecting pipe B6 on the other side of the heater 301, and blows out fresh air;

[0050] Example 2: Please refer to Figure 1-13 On the basis of the first embodiment, the present invention provides a technical solution: both ends of the fixing rod 308 are fixedly connected to the inner wall of the heating groove 306 , and one end of the fixing rod 308 away from the sliding sleeve 309 is fixedly connected to a magnetic block 311 .

[0051] The sliding sleeve 309 and the magnetic block 311 are magnetic, and the magnetism of the sliding sleeve 309 and the magnetic block 311 on the opposite side is that opposite poles attract each other.

[0052] The fixing rods 308 are inclined on the inner wall of the heating groove 306 . The two fixing rods 308 are V-shaped and are not parallel to each other. The outer wall of the heater 301 is fixedly connected with a fixing plate 307 .

[0053] The heater 301 is started to heat the heat transfer plate 303 on the inner wall, and the temperature of the heat transfer plate 303 is transferred to the heat-conducting tube 304. Therefore, when the air passes through the heating grooves 306 on the inner wall of the heat-conducting tube 304, the air is fully heated and discharged because the inner wall area of ​​the heating grooves 306 is large and the number of the heating grooves 306 is large, thereby achieving the heating effect of the air. Moreover, the air is more evenly heated and circulated through the heating grooves 306 in the closed heat-conducting tube 304.

[0054] Because the inner wall of the heating groove 306 is inclined, when the air passes through the inner wall of the heating groove 306, it will push the inclined heating groove 306 and drive the heat transfer tube 304 and the heat transfer plate 303 to rotate. The heat transfer plate 303 drives the heater 301 on the outer wall to rotate synchronously. The rotation of the heater 301 causes the fixed plate 307 on the outer wall to rotate synchronously. Therefore, different fresh air circulation speeds will accelerate the rotation speed of the heating groove 306 to the fixed plate 307 to different degrees. By observing the different rotation speeds of the fixed plate 307, the speed of the fresh air passing through the heating groove 306 can be identified, so that the air circulation speed inside can be more intuitively understood, which is convenient for the use of the fresh air system. By observing whether the rotation speed of the fixed plate 307 changes under the same air supply pressure, it can also be judged whether there is a blockage in the inner wall of the heating groove 306, and whether it is blocked by residues and stains in a long-term ventilation state, so as to facilitate timely cleaning and maintenance.

[0055] The heater 301 can rotate relative to the connecting pipe A5 and the connecting pipe B6 through the bearings 302 on both sides without affecting each other.

[0056] When the air passes through the heating groove 306 in the heat-conducting tube 304, the residue in the air will inevitably adhere to the heating groove 306. In order to maintain high efficiency in heating the air, the heating groove 306 will inevitably be easily clogged with dust. However, when the heating groove 306 in the heat-conducting tube 304 heats the air, the heat-conducting tube 304 rotates automatically, so that once the residue dust particles adhere to the inner wall of the heating groove 306, they will be immediately thrown out along the inner wall of the heating groove 306 in the centrifugal inertia of the rotation, thereby reducing the problem of particles adhering to the inner wall of the heating groove 306 and further ensuring the stability of the heating of the air by the heating groove 306.

[0057] When the heat-conducting cylinder 304 starts to rotate, the fixed rod 308 and the sliding sleeve 309 inside each heating groove 306 are driven to rotate synchronously, and the sliding sleeve 309 sleeved on the outer wall of the fixed rod 308 when the fixed rod 308 rotates will slide outward on the fixed rod 308 due to the centrifugal force, and the exit positions on the left and right sides of a heating groove 306 are respectively provided with a fixed rod 308 and a sliding sleeve 309, so when the sliding sleeves 309 on the two fixed rods 308 in a heating groove 306 slide outward, the elastic strip 310 will be driven to rise synchronously, and the fluff and other particles blocked in the heating groove 306 will be peeled off by the movement of the elastic strip 310 on the inner wall of the heating groove 306, and will be thrown away with the centrifugal force of the rotation of the heat-conducting cylinder 304, so as to keep the interior clean and reduce the blockage problem in the heating groove 306;

[0058] When the two sliding sleeves 309 slide and move the elastic strip 310 outward, the two fixed rods 308 in one heating slot 306 are inclined. When the two sliding sleeves 309 move outward, the distance between the two sliding sleeves 309 gradually increases, thereby stretching the elastic strip 310. The elastic force of the stretched elastic strip 310 increases. Therefore, when the fresh air supply stops, the elastic force of the elastic strip 310 automatically pulls the two sliding sleeves 309 to slide and reset on the fixed rod 308, completing the automatic reset work.

[0059] When the fresh air operation starts, the heat conducting tube 304 and the heating groove 306 start to rotate, and the sliding sleeve 309 is thrown outward along the fixing rod 308, and will slide onto the magnetic block 311, and will be magnetically attracted to each other by the magnetic attraction between the sliding sleeve 309 and the magnetic block 311. Only when the speed drops to a slower level, the elastic force of the elastic strip 310 will pull the magnetic attraction between the two sliding sleeves 309 and the magnetic block 311 apart and reset. During the air supply heating operation, once the heating groove 306 is accidentally blocked, the ventilation volume in the heating groove 306 will be greatly reduced, and the speed will also drop automatically, so that at this time the speed When the sliding sleeve 309 is lowered, it is no longer subjected to a large centrifugal force. At this time, it is pulled back to its original position by the elastic force of the elastic strip 310. Therefore, when the sliding sleeve 309 is reset, the elastic strip 310 moves together in the inner wall of the heating groove 306 and completes the action of moving the stains in the inner wall of the heating groove 306. When the heating groove 306 is working, once a large-scale blockage occurs inside the heating groove 306, the heating groove 306 is automatically unblocked as the speed decreases. There is no need to manually unblock it, which effectively ensures the heating stability during fresh air ventilation, reduces the workload, and improves efficiency.

[0060] Example 3: Please refer to Figure 1-20 On the basis of the first and second embodiments, the present invention provides a technical solution: a pressure relief mechanism 4 is provided at the center of the heating tank 306, and the pressure relief mechanism 4 includes a hollow column 401, which is fixedly connected to the center of the heating tank 306, and a connecting tube 402 is slidably connected to the inner wall of the hollow column 401.

[0061] The left end of the connecting tube 402 is fixedly connected with a connecting block 403 , the inner wall of the connecting block 403 is provided with a circular groove 404 , and the inner wall of the circular groove 404 is fixedly connected with a pulling plate 405 .

[0062] A ventilation slot 406 is formed on the outer wall of the connecting tube 402 . A round rod 407 is fixedly connected to the right end of the connecting tube 402 . A round plate 408 is fixedly connected to one end of the round rod 407 . A connecting shaft 410 is fixedly connected to one side of the round plate 408 .

[0063] A magnetic plate 411 is fixedly connected to one end of the connecting shaft 410. The magnetic plate 411 is magnetic on the side opposite to the connecting tube 402 and has opposite poles that attract each other. A spring 409 is fixedly connected to the right side of the hollow column 401. One end of the spring 409 is fixedly connected to the left side of the circular plate 408. The left side of the circular plate 408 is fixedly connected to the right side of the hollow column 401 through a pull rope 412.

[0064] When the heating tank 306 works for a long time, a large amount of residue adhered to the inner wall of the heating tank 306 cannot be pushed away and cleaned by the elastic strip 310. Then, once a high wind speed is used, the diameter of the heating tank 306 is insufficient, resulting in insufficient ventilation, and the air pressure inside the heater 301 increases rapidly. At this time, fresh air ventilation and heating are quickly carried out. When the heating tank 306 is blocked again, the increase in the air pressure inside the heater 301 will push the connecting tube 402, and the connecting tube 402 will pass through the round rod 401 when being pushed. 07. The circular plate 408 and the connecting shaft 410 pull the magnetic plate 411, and the air pressure at this time is greater than the magnetic attraction between the magnetic plate 411 and the hollow column 401. When the force of the air pressure pushing the ventilation slot 406 is greater than the preset value of the magnetic attraction between the magnetic plate 411 and the hollow column 401, the magnetic plate 411 will be pushed away from the magnetic attraction with the hollow column 401, so that the connecting tube 402 and the connecting block 403 are pushed to move to the right together, and the circular plate 408 is pulled by the pull rope 412 to complete the limit of the overall moving distance of the connecting tube 402;

[0065] When the pull rope 412 is tightened to pull the circular plate 408, the right end of the connecting tube 402 extends out of the hollow column 401, and the air that was originally unable to pass through the heating groove 306 drills into the connecting tube 402 from the circular groove 404 in the connecting block 403 due to the higher air pressure at this time. Since the connecting tube 402 extends out of the hollow column 401, the ventilation groove 406 is completely exposed. At this time, the air that was unable to pass through the heating groove 306 all flows out from the open ventilation groove 406, avoiding the problem of restricted air circulation due to blockage of the heating groove 306, and automatically opening another circulation channel in the high-pressure state under the blockage, avoiding the problem of damage to the fresh air fan 2 due to reverse pressure under long-term high pressure;

[0066] And the air passing through the circular groove 404 will be moved to the inner wall of the hollow column 401 by the connecting block 403 driven by the connecting tube 402 and fit into the hollow column 401, so that the heat on the hollow column 401 is quickly transferred to the connecting block 403, so that the air passing through the circular groove 404 on the inner wall of the connecting block 403 will be heated synchronously. When the heating groove 306 can circulate and heat the air normally, the connecting block 403 will not share the heat on the heat-conducting tube 304 because it is outside the hollow column 401, so that under normal working conditions, the heat-conducting tube 304 and the inner wall of the heating groove 306 are given Sufficient heat is used to heat the air. In the event that the heating groove 306 is blocked, the heat on the heat-conducting tube 304 is quickly transferred to the connecting block 403 through the fitting of the connecting block 403 and the inner wall of the hollow column 401 through the hollow column 401. The circular groove 404 and the heating groove 306 are used together to heat the air. Then, a large amount of air passing through the circular groove 404 can still maintain a stable heating effect. When the staff cleans and inspects it, the heating groove 306 is cleaned, the ventilation is normal, and high pressure is no longer formed. Then the connecting tube 402 will not be pushed out of the hollow column 401.

[0067] Finally, after the fresh air supply is completed, the air stops flowing, and no air passes through the heating groove 306, so the heating groove 306 stops rotating. At the same time, if the connecting cylinder 402 and the circular plate 408 are pushed out, they will be pulled back to their original positions by the elastic force of the spring 409, and the magnetic plate 411 will continue to maintain magnetic attraction stability with the hollow column 401, so that everything is reset.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A heating device for a fresh air system, comprising a fresh air fan (2), one side of the fresh air fan (2) being fixedly connected to an outlet pipe (1), one end of the outlet pipe (1) being fixedly connected to a connecting pipe A (5), characterized in that: A uniform heating mechanism (3) is provided on one side of the connecting pipe A (5); The uniform heating mechanism (3) comprises: The heater (301) is a circular cylindrical structure. The left and right ends of the heater (301) are fixedly connected with bearings (302). The left side of the heater (301) is rotatably connected to one end of a connecting pipe A (5) via the bearing (302) located on the left side. The right side of the heater (301) is rotatably connected to a connecting pipe B (6) via the bearing (302) located on the right side. The inner wall of the heater (301) is fixedly connected with a heat transfer plate (303). The heater (301) is used to heat the heat transfer plate (303) and heat and transfer the air passing through the inside of the heat transfer plate; A heat-conducting tube (304) is a columnar structure. A heating groove (306) is provided on the inner wall of the heat-conducting tube (304). The heating groove (306) is arranged at an angle. Two fixing rods (308) are fixedly connected to the inner wall of the heating groove (306). A sliding sleeve (309) is fixedly connected to the outer wall of the fixing rod (308). An elastic strip (310) is fixedly connected to the outer wall of the sliding sleeve (309). The heat-conducting tube (304) is used to allow air to pass through the heating groove (306) inside the heat-conducting tube so as to wrap and heat the air.

2. A heating device for a fresh air system according to the outlet pipe 1, characterized in that: Both ends of the fixing rod (308) are fixedly connected to the inner wall of the heating groove (306), and one end of the fixing rod (308) away from the sliding sleeve (309) is fixedly connected to a magnetic block (311).

3. A heating device for a fresh air system according to the fresh air fan 2, characterized in that: The sliding sleeve (309) and the magnetic block (311) are magnetic, and the magnetism of the sliding sleeve (309) and the magnetic block (311) on opposite sides is that opposite poles attract each other.

4. A heating device for a fresh air system according to claim 3, characterized in that: The fixing rods (308) are arranged obliquely on the inner wall of the heating groove (306), the two fixing rods (308) are in a V shape and are not parallel to each other, and the outer wall of the heater (301) is fixedly connected with a fixing plate (307).

5. A heating device for a fresh air system according to claim 4, characterized in that: A pressure relief mechanism (4) is provided at the center of the heating groove (306), and the pressure relief mechanism (4) comprises a hollow column (401). The hollow column (401) is fixedly connected to the center of the heating groove (306), and a connecting tube (402) is slidably connected to the inner wall of the hollow column (401).

6. A heating device for a fresh air system according to claim 5, characterized in that: The left end of the connecting tube (402) is fixedly connected to a connecting block (403), a circular groove (404) is formed on the inner wall of the connecting block (403), and a pull plate (405) is fixedly connected to the inner wall of the circular groove (404).

7. A heating device for a fresh air system according to claim 6, characterized in that: The outer wall of the connecting tube (402) is provided with a ventilation groove (406); the right end of the connecting tube (402) is fixedly connected to a round rod (407); one end of the round rod (407) is fixedly connected to a round plate (408); one side of the round plate (408) is fixedly connected to a connecting shaft (410).

8. A heating device for a fresh air system according to claim 7, characterized in that: One end of the connecting shaft (410) is fixedly connected to a magnetic plate (411), and the side of the magnetic plate (411) opposite to the connecting tube (402) is magnetic and has opposite poles that attract each other. The right side of the hollow column (401) is fixedly connected to a spring (409), and one end of the spring (409) is fixedly connected to the left side of the circular plate (408). The left side of the circular plate (408) is fixedly connected to the right side of the hollow column (401) via a pull rope (412).

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