Gas air heating heater for transport vehicle

Abstract

The utility model provides a fuel gas air heating heater for a transport vehicle, which is characterized in that an upper cover (2) and a lower cover (3) are assembled to form a cylindrical shell (5), an air inlet cover (1) is assembled at one axial end of the shell (5), an air outlet cover (4) is assembled at the other axial end of the shell (5), and the air inlet cover (1), the shell (5) and the air outlet cover (4) form an outer cover (6) with a hollow cavity; and a heat supply fan (7), a fan motor (8), a connecting bracket (9), a combustion fan (10) and a heat exchanger (11) are sequentially arranged between the air inlet cover (1) and the air outlet cover (4) in the hollow cavity of the outer cover (6). The fuel oil air-heating heater is integrated, efficient, low in noise, energy-saving and environment-friendly, and can effectively solve the problems that when fuel oil air-heating heaters are applied to fuel gas type transport vehicles, large noise and peculiar smell exist, and tail gas emission is not environment-friendly and the like in the working process.

Description

Technical Field

[0001] The utility model relates to a gas air heater for transport vehicles. Background Art

[0002] With the emergence of transport vehicles such as clean energy gas trucks and buses, the application of air heaters can help transport vehicles provide warm air inside the vehicle during transportation in cold environments, improving the comfort of the interior environment. The widely used air heaters on the market are of the fuel type. When this type of heater is applied to gas transport vehicles, it not only requires additional fuel reserves, but also produces relatively large noise and odors during operation, and the exhaust emissions are not environmentally friendly. Summary of the Invention

[0003] The purpose of the present utility model is to provide a gas air heater for gas transportation vehicles, which is integrated, efficient, low-noise, energy-saving and environmentally friendly.The technical solution of the utility model is: a gas-fired air heater for a transport vehicle, comprising: an air inlet mask (1), an upper cover (2), a lower cover (3), and an air outlet mask (4). The upper cover (2) and the lower cover (3) are assembled to form a cylindrical outer shell (5). The air inlet mask (1) is assembled at one axial end of the outer shell (5), and the air outlet mask (4) is assembled at the other axial end of the outer shell (5). The air inlet mask (1), the outer shell (5), and the air outlet mask (4) form an outer cover (6) with a hollow cavity. Inside the hollow cavity of the outer cover (6), a heating fan (7), a fan motor (8), a connecting bracket (9), a combustion-supporting fan (10), and a heat exchanger (11) are sequentially arranged from the air inlet mask (1) to the air outlet mask (4). The connecting bracket (9) is fixed to the outer shell (5). The fan motor (8) is fixed to the front end of the connecting bracket (9). The heat exchanger (11) with a hollow cavity is fixed to the rear end of the connecting bracket (9). The combustion-supporting air inlet pipe (12) is fixed to the lower end of the connecting bracket (9). The front rotor shaft (81) of the fan motor (8) is installed with the heating fan (7). The rear rotor shaft (82) of the fan motor (8) passes through the connecting bracket (9) and the extended end is installed with the combustion-supporting fan (10). A control component (13) is arranged above the fan motor (8), and a high-voltage conversion device (14) is arranged below the fan motor (8). The heat exchanger (11) with a hollow cavity is composed of a front cylindrical section (111) and a rear conical section (112). The inside of the heat exchanger (11) is provided with evenly distributed internal heat dissipation fins (113), and the outside of the heat exchanger (11) is provided with evenly distributed external heat dissipation fins (114). A long strip-shaped through hole (15) and an exhaust gas pipe (16) are arranged below the heat exchanger (11). The combustion chamber assembly (17) is fixed inside the cavity of the heat exchanger (11). The combustion chamber assembly (17) is composed of a combustion cylinder (171), an ignition device (172), and a gas conduit (173). An annular cavity (18) is formed between the internal heat dissipation fins (113) of the heat exchanger (11) and the combustion cylinder (171). The ignition device (172) is sleeved inside the combustion cylinder (171). The leading-out section (31) of the gas conduit (173) fixed to the combustion chamber assembly (17) passes through the long strip-shaped through hole (15) and is placed outside the outer shell (5). The vertical section (32) of the gas conduit (173) is sleeved inside the ignition device (172). The ignition device (172) is composed of a gas mixing hood (21), a combustion net (22), a combustion hood (23), and a plurality of electrodes (24). The combustion net (22) is sleeved inside the gas mixing hood (21). The combustion hood (23) is composed of an upper convex plate (231) and a lower annular plate (232). A conical ring (233) is fixed between the upper convex plate (231) and the lower annular plate (232). The upper convex plate (231) is provided with multiple circles of annular through holes (310). The conical ring (233) is provided with a plurality of evacuation through holes (330). The plurality of electrodes (24) are fixed to the annular plate (232). The gas mixing hood (21) is sleeved on the convex plate (231).

[0004] There are three electrodes (24) fixed on the annular plate (232) at the lower part of the combustion hood (23). An arc ignition release distance H is provided between the first electrode (241) and the second electrode (242), and the third electrode (243) is placed opposite to the first electrode (241) and the second electrode (242).

[0005] Circumferentially equally pitched and uniformly distributed internal heat dissipation fins (113) are provided on the inner wall of the cylindrical section (111) of the heat exchanger (11). The spacing of the uniformly distributed internal heat dissipation fins (113) on the inner wall of the cylindrical section (111) gradually increases from the bottom end to the side of the tail gas exhaust pipe (16), and the spacing of the uniformly distributed internal heat dissipation fins (113) on the inner wall of the tail cone section (112) also gradually increases from the bottom end to the side of the tail gas exhaust pipe (16).

[0006] The cross-section of the uniformly distributed internal heat dissipation fins (113) inside the heat exchanger (11) gradually decreases in size along the axial direction from the bottom end of the heat exchanger (11) towards the tail gas exhaust pipe (16).

[0007] The diameter of the circle formed by the tops of the uniformly distributed internal heat dissipation fins (113) inside the heat exchanger (11) gradually decreases along the axial direction from the side of the tail gas exhaust pipe (16) towards the direction away from the tail gas exhaust pipe (16).

[0008] There is a distance E of offset towards the tail gas exhaust pipe (16) between the center of the circle formed by the tops of the uniformly distributed internal heat dissipation fins (113) inside the heat exchanger (11) and the center of the circular shape of the inner wall of the heat exchanger (11); the height of the circumferentially uniformly distributed internal heat dissipation fins (113) inside the heat exchanger (11) is the minimum value L at the tail gas exhaust pipe (16) and the maximum value D at the opposite side of the tail gas exhaust pipe (16).

[0009] The external heat dissipation fins (114) provided outside the heat exchanger (11) form a square structure.

[0010] The working principle of the present utility model:

[0011] The gas-fired air heater of the present utility model uses a control component (13) to automatically control each controlled object such as a fan motor (8) and a high-voltage conversion device (14) by adopting a programmable electronic controller. The high-voltage conversion device (14) releases an arc by discharging the converted pulsed high voltage between a first electrode (241) and a second electrode (242). The gas source is from a branch opened in the gas pipeline of the gas transport vehicle itself. After passing through a gas pressure reducing valve and a control valve, it then enters the combustion chamber assembly (17) through a gas conduit (173). It is mixed with the combustion-supporting air sucked in by the combustion-supporting fan (10) in the combustion chamber and is ignited by the high-voltage arc released between the first electrode (241) and the second electrode (242). After the hot air flow of combustion passes through the combustion cylinder (171), it reversely flows through the annular cavity (18) formed between the heat dissipation fins (113) in the heat exchanger (11) and the combustion cylinder (171), and finally the hot air is discharged through the exhaust gas pipe (16). The electrode (243) can sense the internal temperature of the combustion chamber in real time and reflect the internal combustion state. The required warm air is sucked in the cold air from the air inlet mask (1) by the heating fan (7). The sucked cold air is heated after flowing through the external heat dissipation fins (114) of the heat exchanger (11), and then the warm air is conveyed to the vehicle cab through the air outlet mask (4).

[0012] Technical effects of the present utility model:

[0013] The present utility model has the following beneficial effects:

[0014] 1. The gas-fired air heater of the present utility model uses an upper cover (2) and a lower cover (3) to be assembled to form a cylindrical outer shell (5). The air inlet mask (1) is assembled at one axial end of the outer shell (5), and the air outlet mask (4) is assembled at the other axial end of the outer shell (5). The air inlet mask (1), the outer shell (5) and the air outlet mask (4) form an outer cover (6) with a hollow cavity; then the heating fan (7), the fan motor (8), the connecting bracket (9), the combustion-supporting fan (10), and the heat exchanger (11) are sequentially arranged inside the hollow cavity of the outer cover (6) from the air inlet mask (1) to the air outlet mask (4). The connecting bracket (9) serving as an intermediate connecting mechanism is fixed on the outer shell (5), and the fan motor (8) and the heat exchanger (11) are fixed at its front and rear ends in sequence; and a control component (13) is provided above the fan motor (8), and a high-voltage conversion device (14) is provided below it. The front and rear end rotor shafts of the fan motor (8) are sequentially fixed with the heating fan (7) and the combustion-supporting fan (10). By means of a compact layout, each component is integrally arranged in an outer cover with an axial hollow cavity. The heating fan (7) near the air inlet mask (1) end can effectively reduce the wind resistance of the supplied warm air, reduce the noise generated by the high rotational speed of the fan motor, thereby reducing the power consumption and improving the environmental comfort.

[0015] 2. The combustion chamber of the present utility model is a cavity structure, and its characteristics are as follows: The overall combustion chamber is fixed inside the cavity of the heat exchanger (11), and the heat exchanger (11) is composed of a front cylindrical section (111) and a rear conical section (112). When the hot air flow generated after the gas is ignited in the combustion chamber cavity flows smoothly to the rear conical section (112) of the heat exchanger (11), through the conical structure, the hot air flow can be quickly reversed and flow into the annular cavity (18) formed between the internal fins (113) and the combustion cylinder (171) of the heat exchanger (11). Then the heat can be concentrated in the annular cavity (18) and can be efficiently absorbed by the internal fins.

[0016] 3. The gas-fired air heater of the present utility model is provided with a long strip-shaped through hole (15) below the heat exchanger (11). The leading-out section (31) of the gas conduit (173) fixed on the combustion chamber assembly (17) can be passed through the long strip-shaped through hole (15) and placed outside the housing (5). The vertical section (32) of the gas conduit (173) is sleeved inside the ignition device (172). The fuel required for this heater can utilize the branch opened in the gas pipeline of the gas vehicle itself as the supply. After passing through the gas pressure reducing device, it can be directly connected to the gas conduit (173), without the need to reserve additional gas fuel, which is convenient for later operation and maintenance.

[0017] 4. The ignition device (172) arranged inside the combustion chamber assembly (17) of the present utility model is composed of a gas mixing hood (21), a combustion net (22), a combustion hood (23), and multiple electrodes (24). Among them, the combustion net (22) is sleeved inside the gas mixing hood (21). The combustion hood (23) is composed of a convex plate (231) located in the upper part and an annular plate (232) located in the lower part. A conical ring (233) is fixed between the convex plate (231) located in the upper part and the annular plate (232) located in the lower part. Multiple annular through holes (310) are provided on the convex plate (231) located in the upper part, and multiple evacuation through holes (330) are provided on the conical ring (233). The multiple electrodes (24) are fixed on the annular plate (232), and the gas mixing hood (21) is sleeved on the convex plate (231). The purpose of this setting is that when the gas enters the combustion chamber, it first mixes with the combustion-supporting air inside the gas mixing hood (21), and then is ignited after flowing through the combustion net (22). The combustion net (22) can evenly distribute the mixed gas to the multiple annular through holes (310) and the multiple evacuation through holes (330). Through this setting, local fuel deflagration and noise can be avoided, and the uniform and sufficient combustion of the fuel can be ensured, improving the combustion efficiency and the environmental protection of the exhaust gas.

[0018] 5. The utility model is provided with three electrodes fixed on an annular plate (232) at the lower part of a combustion hood (23). An arc ignition release distance H is always maintained between a first electrode (241) and a second electrode (242), which can avoid arc ignition between the electrodes and the inner wall of the combustion chamber cavity, ensure the combustion reliability and safety, improve the combustion efficiency and the exhaust gas environmental protection performance. And a third electrode (243) opposite to the first electrode (241) and the second electrode (242) can sense the internal temperature of the combustion chamber in real time and reflect the internal combustion state.

[0019] 6. The inner wall of a cylindrical section (111) of a heat exchanger (11) of the utility model is provided with internally distributed heat dissipation fins (113) evenly distributed at equal circumferential pitches. The distance between the internally distributed heat dissipation fins (113) on the inner wall of the cylindrical section (111) gradually increases from the bottom end to the side of an exhaust gas pipe (16). The distance between the internally distributed heat dissipation fins (113) on the inner wall of a tail cone section (112) also gradually increases from the bottom end to the side of the exhaust gas pipe (16). The internal setting of the heat exchanger (11) with the distance between the internally distributed heat dissipation fins (113) gradually increasing from the bottom end to the side of the exhaust gas pipe (16) can enable the hot air flow in the combustion chamber to run towards a larger channel, avoid the blockage of the hot air flow, and further improve the fuel utilization rate, the heat conduction efficiency of the heat exchanger (11), and the energy conservation and environmental protection performance.

[0020] 7. The cross section of the internally distributed heat dissipation fins (113) inside the heat exchanger (11) of the utility model gradually decreases in size along the axial direction from the bottom end of the heat exchanger (11) towards the exhaust gas pipe (16). This also ensures that the distance between the heat dissipation fins (113) gradually increases from the bottom end to the side of the exhaust gas pipe (16), avoids the blockage of the hot air flow, and improves the heat conduction performance of the heat exchanger (11).

[0021] 8. The diameter of a circle formed by the tops of the internally distributed heat dissipation fins (113) inside the heat exchanger (11) of the utility model gradually decreases along the axial direction from the side of the exhaust gas pipe (16) towards the direction away from the exhaust gas pipe (16). This setting method facilitates the die drawing of the inner cavity of the die-casting part and the later assembly of the product.

[0022] 9. The circular center formed at the top of the evenly distributed internal heat dissipation fins (113) inside the heat exchanger (11) of the present utility model and the circular center of the inner wall of the heat exchanger (11) are provided with a distance E offset towards the exhaust gas pipe (16); therefore, the height of the evenly distributed internal heat dissipation fins (113) on the inner circumference of the heat exchanger (11) is the minimum value L at the exhaust gas pipe (16) and the maximum value D at the opposite side of the exhaust gas pipe (16). This makes the internal heat dissipation fins have the smallest flow cross-section at the exhaust gas pipe and the largest flow cross-section at the opposite side of the exhaust gas pipe, so that the combustion gas can preferentially flow through the area with a relatively large flow cross-section, thereby avoiding the combustion gas from being discharged too quickly from the exhaust gas pipe inside the heat exchanger (11), and further improving the heat conduction performance of the heat exchanger (11).

[0023] 10. The external heat dissipation fins (114) provided outside the heat exchanger (11) of the present utility model form a square structure. The square structure makes full use of the space inside the outer cover (6) to improve the heat dissipation efficiency of the external heat dissipation fins. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the outer cover structure in the embodiment of the present utility model;

[0025] Figure 2 It is a schematic diagram of the overall sectional structure in the embodiment of the present utility model;

[0026] Figure 3 It is a schematic diagram of the structure of the ignition device 172 in the embodiment of the present utility model;

[0027] Figure 4 It is a schematic diagram of the overall sectional structure of the heat exchanger 11 in the embodiment of the present utility model;

[0028] Figure 5 It is a right view of the heat exchanger 11 in the embodiment of the present utility model. Detailed Embodiment

[0029] Figure 1 As shown, the embodiment of the present utility model provides a gas-fired air heater for a transport vehicle, including: an air inlet mask 1, an upper cover 2, a lower cover 3, and an air outlet mask 4. Among them, the upper cover 2 and the lower cover 3 are assembled to form a cylindrical outer shell 5. The air inlet mask 1 is assembled at one axial end of the outer shell 5, and the air outlet mask 4 is assembled at the other axial end of the outer shell 5. The air inlet mask 1, the outer shell 5, and the air outlet mask 4 form an outer cover 6 with a hollow cavity.

[0030] Embodiment 1: In this embodiment, the air inlet mask 1, the upper cover 2, the lower cover 3, and the air outlet mask 4 are preferably made of flame-retardant and heat-resistant plastic products. The assembly method is completed through the structure of the plastic products themselves without the need to rely on external components to complete the assembly relationship.

[0031] Figure 2 As shown, inside the cavity of the outer cover 6, a heating fan 7, a fan motor 8, a connecting bracket 9, a combustion-supporting fan 10, and a heat exchanger 11 are successively arranged from the air inlet mask 1 to the air outlet mask 4. Among them, the connecting bracket 9 is fixed to the outer shell 5, the fan motor 8 is fixed to the front end of the connecting bracket 9, the heat exchanger 11 with a hollow cavity is fixed to the rear end of the connecting bracket 9, and the combustion-supporting air inlet pipe 12 is fixed to the lower end of the connecting bracket 9; the front-end rotor shaft 81 of the fan motor 8 installs the heating fan 7, the rear-end rotor shaft 82 of the fan motor 8 passes through the connecting bracket 9, and the extended end installs the combustion-supporting fan 10. A control component 13 is arranged above the fan motor 8, and a high-voltage conversion device 14 is arranged below the fan motor 8; the heat exchanger 11 with a hollow cavity is composed of a front cylindrical section 111 and a rear conical section 112. The inside of the heat exchanger 11 is provided with evenly distributed internal heat dissipation fins 113, the outside of the heat exchanger 11 is provided with evenly distributed external heat dissipation fins 114, and a long strip-shaped through hole 15 and an exhaust gas pipe 16 are arranged below the heat exchanger 11; the combustion chamber assembly 17 is fixed inside the cavity of the heat exchanger 11. The combustion chamber assembly 17 is composed of a combustion cylinder 171, an ignition device 172, and a gas conduit 173. An annular cavity 18 is formed between the internal heat dissipation fins 113 of the heat exchanger 11 and the combustion cylinder 171. The ignition device 172 is sleeved inside the combustion cylinder 171. The leading-out section 31 of the gas conduit 173 fixed to the combustion chamber assembly 17 passes through the long strip-shaped through hole 15 and is placed outside the outer shell 5. The vertical section 32 of the gas conduit 173 is sleeved inside the ignition device 172; the ignition device 172 is composed of a gas mixing hood 21, a combustion net 22, a combustion hood 23, and a plurality of electrodes 24. Among them, the combustion net 22 is sleeved inside the gas mixing hood 21.

[0032] Embodiment 2: In this embodiment, the combustion chamber is a cavity structure. When the hot air flow generated after the gas is ignited in the combustion chamber cavity can smoothly flow to the rear conical section 112 of the heat exchanger 11, through the conical structure, the hot air flow can be quickly reversed and flow to the annular cavity 18 formed between the internal heat dissipation fins 113 of the heat exchanger 11 and the combustion cylinder 171, and the heat can be concentrated in the annular cavity 18 and can be efficiently absorbed by the internal heat dissipation fins.

[0033] In this embodiment, the combustion cylinder 171, the gas mixing hood 21, the combustion net 22, the combustion hood 23, and the plurality of electrodes 24 of the combustion chamber assembly 17 are all made of stainless steel material that can withstand long-term burning and high temperatures.

[0034] Figure 3 As shown, the combustion hood 23 is composed of an upper convex plate 231 and a lower annular plate 232. A conical ring 233 is fixed between the upper convex plate 231 and the lower annular plate 232. The upper convex plate 231 is provided with multiple circles of annular through holes 310, the conical ring 233 is provided with a plurality of evacuation through holes 330, the plurality of electrodes 24 are fixed to the annular plate 232, and the gas mixing hood 21 is sleeved on the convex plate 231.

[0035] There are three electrodes 24 fixed on the annular plate 232 at the lower part of the combustion hood 23. An arc ignition release distance H is provided between the first electrode 241 and the second electrode 242, and the third electrode 243 is placed opposite to the first electrode 241 and the second electrode 242.

[0036] Figure 4 As shown, on the inner wall of the cylindrical section 111 of the heat exchanger 11, inner heat dissipation fins 113 are evenly distributed at equal circumferential pitches. The spacing of the inner heat dissipation fins 113 evenly distributed on the inner wall of the cylindrical section 111 gradually increases from the bottom end towards the side of the tail gas exhaust pipe 16, and the spacing of the inner heat dissipation fins 113 evenly distributed on the inner wall of the tail cone section 112 also gradually increases from the bottom end towards the side of the tail gas exhaust pipe 16.

[0037] Figure 5 As shown, the cross-section of the inner heat dissipation fins 113 evenly distributed inside the heat exchanger 11 gradually becomes smaller along the axial direction from the bottom end of the heat exchanger 11 towards the direction of the tail gas exhaust pipe 16.

[0038] The circle formed by the tops of the inner heat dissipation fins 113 evenly distributed inside the heat exchanger 11 gradually decreases in diameter along the axial direction from the side of the tail gas exhaust pipe 16 towards the direction away from the tail gas exhaust pipe 16.

[0039] There is a distance E of offset towards the direction of the tail gas exhaust pipe 16 between the center of the circle formed by the tops of the inner heat dissipation fins 113 evenly distributed inside the heat exchanger 11 and the center of the inner circle of the heat exchanger 11 inner wall; the height of the inner heat dissipation fins 113 evenly distributed in the circumferential direction inside the heat exchanger 11 is the minimum value L at the tail gas exhaust pipe 16 and the maximum value D at the opposite side of the tail gas exhaust pipe 16.

[0040] The outer heat dissipation fins 114 provided outside the heat exchanger 11 form a square structure.

[0041] Embodiment 3: In this embodiment, the heat exchanger 11 is a die-cast part. There is an offset E in the direction of the tail gas exhaust pipe 16 between the center of the circle formed by the tops of the inner heat dissipation fins 113 and the center of the inner circle of the heat exchanger 11 inner wall, resulting in the smallest flow cross-section of the inner heat dissipation fins at the tail gas exhaust pipe and the largest flow cross-section at the opposite side of the tail gas exhaust pipe. This allows the combustion gas to preferentially flow through the area with a relatively large flow cross-section, thus preventing the combustion gas from discharging too quickly from the tail gas exhaust pipe in the heat exchanger 11 and further improving the heat conduction efficiency of the heat exchanger 11.

Claims

1. A gas-fired air heater for a transport vehicle, characterized in that: include: An air inlet mask (1), an upper mask (2), a lower mask (3), and an air outlet mask (4), wherein the upper mask (2) and the lower mask (3) are assembled to form a cylindrical outer shell (5), the air inlet mask (1) is assembled to one axial end of the outer shell (5), and the air outlet mask (4) is assembled to the other axial end of the outer shell (5), and the air inlet mask (1), the outer shell (5), and the air outlet mask (4) form an outer cover (6) having a hollow cavity; a heating fan (7), a fan motor (8), a connecting bracket (9), a combustion-supporting fan (10), and a heat exchanger (11) are sequentially arranged in the hollow cavity of the outer cover (6) from the air inlet mask (1) to the air outlet mask (4), wherein the connecting bracket (9) is fixed to the outer shell (5), and the fan motor (8) is fixed to the connecting bracket (9 ) front end, a heat exchanger (11) with a hollow cavity is fixed to the rear end of the connecting bracket (9), and a combustion-supporting air intake pipe (12) is fixed to the lower end of the connecting bracket (9); a heating fan (7) is installed on a rotor shaft (81) at the front end of the fan motor (8), a rotor shaft (82) at the rear end of the fan motor (8) is passed through the connecting bracket (9), and a combustion-supporting fan (10) is installed on the extended end, a control component (13) is provided above the fan motor (8), and a high-voltage conversion device (14) is provided below the fan motor (8); the heat exchanger (11) with a hollow cavity is composed of a front cylindrical section (111) and a rear conical section (112), the heat exchanger (11) is provided with uniformly distributed internal heat sinks (113), and the heat exchanger (11) is provided with a heat exchanger (11) outside. The heat exchanger (11) is provided with uniformly distributed external heat sinks (114); a long strip through hole (15) and an exhaust gas exhaust pipe (16) are provided below the heat exchanger (11); a combustion chamber assembly (17) is fixed in the cavity of the heat exchanger (11); the combustion chamber assembly (17) is composed of a combustion tube (171), an ignition device (172), and a gas conduit (173); an annular cavity (18) is formed between the heat sink (113) in the heat exchanger (11) and the combustion tube (171); the ignition device (172) is sleeved in the combustion tube (171); an outlet section (31) of the gas conduit (173) fixed on the combustion chamber assembly (17) is passed through the long strip through hole (15) and is placed outside the housing (5); a vertical section (31) of the gas conduit (173) is provided in the combustion chamber assembly (17); The ignition device (172) is sleeved in the ignition device (172); the ignition device (172) is composed of a gas mixing hood (21), a combustion net (22), a combustion hood (23), and a plurality of electrodes (24), wherein the combustion net (22) is sleeved in the gas mixing hood (21), the combustion hood (23) is composed of an upper convex plate (231) and a lower annular plate (232), a conical ring (233) is fixed between the upper convex plate (231) and the lower annular plate (232), the upper convex plate (231) is provided with a plurality of annular through holes (310), the conical ring (233) is provided with a plurality of evacuation through holes (330), a plurality of electrodes (24) are fixed on the annular plate (232), and the gas mixing hood (21) is sleeved on the convex plate (231).

2. The gas-fired air heater for transport vehicles according to claim 1 is characterized in that: The number of the plurality of electrodes (24) fixed on the annular plate (232) located at the lower part of the combustion hood (23) is three, wherein an arc release distance H is provided between the first electrode (241) and the second electrode (242), and the third electrode (243) is arranged opposite to the first electrode (241) and the second electrode (242).

3. The gas-fired air heater for transport vehicles according to claim 1 is characterized in that: The inner wall of the cylindrical section (111) of the heat exchanger (11) is provided with inner cooling fins (113) uniformly distributed at equal pitches in the circumferential direction, the spacing of the inner cooling fins (113) uniformly distributed on the inner wall of the cylindrical section (111) gradually increases from the bottom end to the side of the exhaust gas exhaust pipe (16), and the spacing of the inner cooling fins (113) uniformly distributed on the inner wall of the tail conical section (112) gradually increases from the bottom end to the side of the exhaust gas exhaust pipe (16).

4. The gas-fired air heater for transport vehicles according to claim 1 is characterized in that: The cross-section of the inner fins (113) uniformly distributed inside the heat exchanger (11) gradually decreases in size along the axial direction from the bottom end of the heat exchanger (11) toward the exhaust pipe (16).

5. The gas-fired air heater for transport vehicles according to claim 1 is characterized in that: The circle formed by the top of the inner fins (113) uniformly distributed inside the heat exchanger (11) has a diameter that gradually decreases in the axial direction from the exhaust gas exhaust pipe (16) to the side away from the exhaust gas exhaust pipe (16).

6. The gas-fired air heater for transport vehicles according to claim 1 is characterized in that: A distance E is set between the center of a circle formed by the top of the inner fins (113) uniformly distributed inside the heat exchanger (11) and the center of a circle on the inner wall of the heat exchanger (11) and offset in the direction of the exhaust gas exhaust pipe (16); the height of the inner fins (113) uniformly distributed on the circumference inside the heat exchanger (11) is a minimum value L at the exhaust gas exhaust pipe (16) and a maximum value D at a position opposite to the exhaust gas exhaust pipe (16).

7. The gas-fired air heater for transport vehicles according to claim 1 is characterized in that: The external heat sink (114) arranged outside the heat exchanger (11) forms a square structure.

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