Combustion device for railway maintenance

Abstract

The invention relates to a combustion device for railway maintenance, defining an axis (P) and comprising: an air compressor assembly (2) comprising an air inlet (20) and an air outlet (21), and a combustion assembly (3) connected to the air outlet (21) of the air compressor assembly (2), wherein the air compressor assembly (2) and the combustion assembly (3) are arranged axially along the axis (P), and wherein the air compressor assembly (2) compresses air to the combustion assembly (3).

Description

Technical Field

[0001] This invention relates to a combustion device for railway maintenance, particularly for aluminothermic welding. Background Technology

[0002] In the late 19th century, with the development of the metallurgical and chemical industries, aluminothermic welding was invented for welding railway rails. To prepare for aluminothermic welding of two rail ends, the welding operator heats the opposing end faces of these rail ends during the welding gap. This heating process aims to remove any moisture that may be present in the welding mold. Furthermore, increasing the temperature of the rail ends slows down the cooling rate of the weld after heating. In this way, the welding operator can obtain the desired metallic structure during the welding gap. However, when working on railway tracks, welding operators need to expend considerable effort and energy to move conventional preheating burners equipped with air compressors onto and off the tracks. Because the air compressor is usually placed on one side of the preheating burner, the conventional preheating burner is relatively large and heavy. Therefore, the conventional preheating burner cannot provide a thinner and lighter combustion device for railway maintenance.

[0003] Technical problem to be solved

[0004] The object of the present invention is to provide a combustion device for railway maintenance, and in particular, a combustion device for a thinner and lighter combustion device for railway maintenance. Summary of the Invention

[0005] The following summarizes some aspects of the invention to provide a basic understanding of the techniques discussed. This abstract is not a comprehensive overview of all contemplated features of the invention, nor is it intended to define key or essential elements of all aspects of the invention, nor to delineate the scope of any or all aspects of the invention. Its sole purpose is to introduce some concepts of one or more aspects of the invention in abstract form as a prelude to a more detailed description thereafter.

[0006] The first aspect of the invention provides a combustion device for railway maintenance, which defines an axis and includes: an air compressor assembly including an air inlet and an air outlet, and a combustion assembly connected to the air outlet of the air compressor assembly, wherein the air compressor assembly and the combustion assembly are arranged axially along the axis, and wherein the air compressor assembly compresses air to the combustion assembly.

[0007] In a second aspect of the invention according to the first aspect, the air compressor assembly further includes: a body axially arranged along an axis, a motor including a motor shaft disposed in the body, and a propeller driven by the motor through the motor shaft and guiding air into the body.

[0008] In a third aspect of the invention according to the second aspect, the main body includes: an outer shell and an inner shell disposed within and connected to the outer shell, wherein the motor is disposed therein, wherein an air passage is defined between the inner shell and the outer shell, and the propeller guides air from the air compressor assembly through the air passage into the combustion assembly.

[0009] In a fourth aspect of the invention according to the third aspect, the main body further includes ribs connecting the outer shell and the inner shell in the air passage.

[0010] In a fifth embodiment of the invention according to any one of the first to fourth embodiments, the air compressor assembly further includes a shroud configured to guide air into the air inlet of the air compressor assembly.

[0011] In a sixth embodiment of the invention according to any one of the first to fourth embodiments, the air compressor assembly further includes: a plastic mounting plate that receives the propeller and is disposed between the cover and the body, and a metal mounting plate disposed between the plastic mounting plate and the body to reinforce the air compressor assembly.

[0012] In a seventh embodiment of the invention according to any one of the third and fourth embodiments, the inner housing of the body includes an inner housing opening that allows air to flow from the air passage into the inner housing to cool the motor.

[0013] In an eighth embodiment of the invention according to any one of the first to fourth embodiments, the combustion assembly comprises: a combustion assembly housing including an air inlet and an air outlet, the air inlet of the combustion assembly housing communicating with the air outlet of the air compressor assembly; a fuel device for supplying fuel to the combustion assembly; and an ignition device for igniting the fuel, wherein the ignition device ignites the fuel in the combustion assembly to produce a flame.

[0014] In a ninth embodiment of the invention according to the eighth embodiment, the combustion assembly further includes the combustion tube assembly disposed in the combustion assembly housing, the combustion tube assembly including: an inlet disc, an outlet disc, and a combustion tube body, the combustion tube body being configured to be hollow and arranged along the axis in the combustion assembly housing and located between the inlet disc and the outlet disc, wherein an air passage is defined between the combustion tube body and the combustion assembly housing, and wherein the air passage of the air compressor assembly, the air passage of the combustion assembly, the combustion tube body, and the air outlet of the combustion assembly are designed to communicate.

[0015] In a tenth aspect of the invention according to the ninth aspect, the combustion tube includes an opening designed along the combustion tube to control the amount of air entering the combustion tube from the air passage, wherein combustion of the fuel and air mixture occurs in the combustion tube.

[0016] In the eleventh aspect of the invention according to the tenth aspect, the opening of the combustion tube near the inlet disc is designed to be smaller than the opening of the combustion tube near the outlet disc.

[0017] In the twelfth aspect of the invention according to the eighth aspect, the combustion assembly includes a sensor for monitoring and detecting the presence of a flame.

[0018] In the thirteenth aspect of the invention according to the eighth aspect, the fuel device is connected to a fuel supply device, and the ignition device is connected to an electrical device.

[0019] In the fourteenth aspect of the invention according to the fifth aspect, the body of the air compressor assembly is constructed as a whole, and the cover and the body are constructed as a whole.

[0020] In any of the first to fourteenth embodiments of the present invention, the air compressor assembly and the combustion assembly are constructed as a single unit.

[0021] The sixteenth aspect of the present invention provides a preheating device for railway maintenance, comprising: a preheating device body, and a combustion device of any of the embodiments 1-15, which is placed in the preheating device, wherein the preheating device is operated on the railway track to heat the railway.

[0022] Advantageously, the present invention aims to provide a thinner and lighter combustion device for railway maintenance and cooling combustion components.

[0023] Further benefits and advantages of the invention will become apparent after careful reading of the detailed description and appropriate reference to the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a perspective view of a combustion device for heating railway tracks according to a preferred embodiment of the present invention.

[0025] Figure 2 yes Figure 1 A side view of the combustion device.

[0026] Figure 3 yes Figure 1 A perspective view of the air compressor assembly.

[0027] Figure 4yes Figure 3 Side view of the air compressor assembly.

[0028] Figure 5 It is along Figure 4 A cross-sectional view of the air compressor assembly depicted by the AA line.

[0029] Figure 6 yes Figure 3 Bottom view of the air compressor assembly.

[0030] Figure 7 It is along Figure 2 A partial cross-sectional view of the combustion device depicted by the AA line.

[0031] Figure 8 It is along Figure 7 The cross-sectional view of the combustion device is depicted by the AA line.

[0032] Figure 9 yes Figure 1 A perspective view of the combustion tube assembly of the combustion device.

[0033] Figure 10 yes Figure 9 Side view of the combustion tube assembly.

[0034] Figure 11 yes Figure 10 A perspective view of the combustion tube assembly.

[0035] Figure 12 yes Figure 10 Another perspective view of the combustion tube assembly.

[0036] Figure 13 It is along Figure 7 The cross-sectional view of the combustion device, depicted by the AA line, shows the airflow conditions.

[0037] Figure 14 It is equipped with Figure 1 A perspective view of the preheating device of the combustion device. Detailed Implementation

[0038] Figure 1 This is a perspective view of a combustion device for heating railway tracks according to a preferred embodiment of the present invention. Figure 2 yes Figure 1 A side view of the combustion device.

[0039] Please refer to this as well. Figure 1 and Figure 2This invention provides a combustion device 1 for railway maintenance, such as for heating rails or drying molds during aluminothermic welding. Specifically, the combustion device 1 defines a longitudinal axis P and includes an air compressor assembly 2 and a combustion assembly 3. The air compressor assembly 2 is used to draw in air and force the air (containing oxygen) into the combustion assembly 3 of the combustion device 1. The combustion assembly 3 is used for the combustion reaction and to generate a flame. The air compressor assembly 2 and the combustion assembly 3 are arranged axially along the axis P. During operation, the air compressor assembly 2 compresses oxygen-containing air into the combustion assembly 3, so that the combustion assembly 3 can ignite fuel and oxygen and generate a flame for railway maintenance. In a preferred embodiment, the flame temperature can be in the range of 500 to 2400 degrees Celsius for welding railways. The axial arrangement of the air compressor assembly 2 and the combustion assembly 3 makes the entire combustion device 1 thinner, smaller, and more symmetrical. Therefore, the welding operator can easily handle and operate the combustion device 1 at the railway construction site.

[0040] Figure 3 yes Figure 1 A perspective view of the air compressor assembly. Figure 4 yes Figure 3 Side view of the air compressor assembly. Figure 5 It is along Figure 4 A cross-sectional view of the air compressor assembly depicted by the AA line. Figure 6 yes Figure 3 Bottom view of the air compressor assembly.

[0041] Please refer to this as well. Figures 1-6 The air compressor assembly 2 includes an air inlet 20, an air outlet 21, a main body 22, a motor 23, and a propeller 24. The air inlet 20 draws air into the combustion device 1, and the air outlet 21 communicates with the combustion assembly 3. The motor 23 includes a motor shaft 230 and is disposed within the main body 22. The motor 23 drives the propeller 24 via the motor shaft 230. The air inlet 20 can be configured in any shape to guide air into the air compressor assembly 2, thereby into the main body 22.

[0042] The main body 22 is arranged axially along axis P and includes an outer shell 220, an inner shell 221, and an air passage 222. Specifically, the inner shell 221 is disposed within the outer shell 220 and connected to the outer shell 220 of the main body 22. The motor 23 is housed within the inner shell 221 of the main body 22. An air passage 222 is defined between the inner shell 221 and the outer shell 220. The propeller 24 guides air from the air compressor assembly 2 through the air passage 222 into the combustion assembly 3. That is, the air inlet 20, the air outlet 21, and the air passage 222 allow air to flow within them.

[0043] To avoid air turbulence in the combustion device 1, the body 22 of a preferred embodiment further includes one or more ribs 224 for enabling more laminar airflow in the air passage 222 and for reinforcing the connection between the outer shell 220 and the inner shell 221. In a preferred embodiment, the ribs 224 may extend entirely or partially between the outer shell 220 and the inner shell 221 in the air passage 222.

[0044] To facilitate the compression and delivery of air to the air inlet 300 of the combustion assembly 3, the air compressor assembly 2 further includes a shroud 25 configured to guide and draw in the air inlet 20 of the air compressor assembly 2. The shroud 25 is also axially arranged along axis P and corresponds to the propeller 24 to collect and optimize the delivery of air to the combustion device 1. In a preferred embodiment, the shroud 25 is shaped to optimally guide air from the propeller 24 into the air passage 222 of the body 22 of the air compressor assembly 2.

[0045] To enhance the connection and assembly of the body 22 and the cover 25, the air compressor assembly 2 further includes a plastic mounting plate 26 and a metal mounting plate 27. Both the plastic mounting plate 26 and the metal mounting plate 27 include openings for air passages 222 into the air compressor assembly 2. The plastic mounting plate 26 receives the propeller 24 and is positioned between the cover 25, the metal mounting plate 27, and the body 22. In a preferred embodiment, the plastic mounting plate 26 includes a propeller guiding function to achieve greater laminar airflow. The metal mounting plate 27 is positioned between the plastic mounting plate 26 and the body 22. Several screws 28 are used for the connection between the plastic mounting plate 26, the metal mounting plate 27, the cover 25, and the body 22 of the air compressor assembly 2, improving the stability of the air compressor assembly 2. In a preferred embodiment, the body 22 of the air compressor assembly 2 can be constructed as a single unit, and the cover 25 and the body 22 can be constructed as a single unit. In a preferred embodiment, the air compressor assembly 2 and the combustion assembly 3 can be constructed as a single unit.

[0046] The motor of a conventional combustion device 1 typically suffers from heat dissipation issues during operation. This combustion device 1 is designed with a cooling function. Specifically, the inner housing 221 of the main body 22 includes an inner housing opening 2210, which allows air to flow into the inner housing 221 from the air passage 222 to cool the motor 23. Therefore, the air in the air compressor assembly 2 is fully circulated. Furthermore, the inner housing 221 also includes a cavity 2211 to optimize the flow path of the cooling air. Additionally, the main body 22 includes a wiring passage 223 passing through the outer housing 220 and the inner housing 221 for receiving the motor 23's wiring and / or releasing cooling air, which also cools the motor 23's wiring accordingly. The wiring passage 223 and the cavity 2211 are interconnected.

[0047] Figure 7 It is along Figure 2 The AA line depicts a partial cross-sectional view of the combustion device. Figure 8 It is along Figure 7 The cross-sectional view of the combustion device is depicted by the AA line. Figure 9 yes Figure 1 A perspective view of the combustion tube assembly of the combustion device. Figure 10 yes Figure 9 Side view of the combustion tube assembly. Figure 11 yes Figure 10 A perspective view of the combustion tube assembly. Figure 12 yes Figure 10 Another perspective view of the combustion tube assembly. Figure 13 It is along Figures 1-13 The cross-sectional view of the combustion device, depicted by the AA line, shows the airflow conditions.

[0048] Please refer to this together. Figure 13The combustion assembly 3 includes a combustion assembly housing 30, a fuel device 31, an ignition device 32, and a combustion tube assembly 33. The combustion assembly housing 30 may be configured as a tube and connected to the air compressor assembly 2. The combustion assembly housing 30 also includes an air inlet 300 and an air outlet 301. The air inlet 300 of the combustion assembly housing 30 communicates with the air outlet 21 of the air compressor assembly 2, so that air can be blown into the combustion assembly 3. The fuel device 31 is used to supply fuel to the combustion assembly 3, and the fuel may be any combustible fuel, gas, or liquid for combustion, such as propane, butane, or hydrogen. The fuel supply device 4 may be arranged to store fuel and connected to the fuel device 31 via a hose (not shown). For example, the fuel supply device 4 may be a fuel tank or a gas cylinder. Similarly, the ignition device 32 is used to ignite the fuel and is connected to an external electrical device 5. For example, the external electrical device 5 may be a generator or a power source that provides the required voltage. When the ignition device 32 ignites the fuel in the combustion assembly 3 to produce a flame F, the air compressor assembly 2 blows the flame F out from the air outlet 301 of the combustion assembly 3.

[0049] In another preferred embodiment, combustion takes place in a combustion tube assembly 33. The combustion tube assembly 33 is disposed within the combustion assembly housing 30 of the combustion assembly 3, and preferably near the lower portion of the combustion assembly housing 30. Specifically, the combustion tube assembly 33 includes a combustion tube body 332, an inlet disc 330, and an outlet disc 331. Details of the combustion tube assembly 33 are provided below.

[0050] The combustion tube 332 is configured to be hollow and arranged along axis P within the combustion assembly housing 30, between the inlet disc 330 and the outlet disc 331. The combustion tube assembly 33 is preferably located near the bottom of the combustion assembly housing 30 of the combustion assembly 3. An air passage 34 is defined between the combustion tube 332 and the combustion assembly housing 30. In a preferred embodiment, the combustion tube 332 further includes an opening 333 designed along the combustion tube 332 to control the amount of air entering the combustion tube 332 from the air passage 34. The inlet disc 330 includes orifices for receiving the fuel device 31 and the ignition device 32. Furthermore, the inlet disc 330 includes an opening 3300 that allows air to enter the air passage 34. Thus, air flows from the air compressor assembly 2 through the opening 3300 of the inlet disc 330 into the air passage 34 of the combustion assembly 3. On the other hand, the outlet disc 331 is formed as a circular disc to seal the bottom of the air passage 34, while the outlet disc 331 leaves the bottom of the combustion tube 332 open, so that the flame F is ejected from the combustion device 1. Therefore, the air passage 222 of the air compressor assembly 2, the opening 3300 of the inlet disc 330, the air passage 34 of the combustion assembly 3, the opening 333 of the combustion tube 332, and the outlet 301 of the combustion assembly 3 are designed to facilitate communication of the airflow G (see [link to documentation]). Figure 14 (Airflow G).

[0051] Fuel device 31 and ignition device 32 extend into combustion tube 332 through holes in inlet disc 330. Therefore, fuel is supplied to combustion tube 332, and combustion of the fuel-oxygen mixture ignited by ignition device 32 occurs within combustion tube 332. In a preferred embodiment, fuel device 31 may be a fuel pipe for supplying fuel, and ignition device 32 may be an ignition electrode. Fuel device 31 and ignition device 32 can extend from the outside of combustion tube assembly 33 to combustion tube 332 and be fixed at inlet disc 330, thus limiting the reaction within combustion tube 332. In another preferred embodiment, fuel device 31 and ignition device 32 may be included in air compressor assembly 2.

[0052] To further optimize the cooling effect of the combustion tube assembly 33 and improve combustion efficiency, the opening 333 of the combustion tube body 332 near the inlet plate 330 can be designed to be smaller than the opening 333 of the combustion tube body 332 near the outlet plate 331. For example, the opening 333 of the combustion tube body 332 can be a first set of openings 3331, a second set of openings 3332, and a third set of openings 3333. The first set of openings 3331 is located near the inlet plate 330; the third set of openings 3333 is located near the outlet plate 331; and the second set of openings 3332 is located between the first set of openings 3331 and the third set of openings 3333. That is, the first set of openings 3331 near the inlet plate 330 is smaller than the third set of openings 3333 near the outlet plate 331. This leads to the following benefits. First, the smaller first set of openings 3331 restricts the amount of air entering the first set of openings 3331 and allows more air to flow down the combustion tube 332 through the air passage 34 to the third set of openings 3333, thereby enabling the air to cool the combustion tube 332 and the combustion assembly housing 30. Second, the smaller size of the first set of openings 3331 allows more converging air to enter the combustion tube 332. This stabilizes the formation of the converging flame F in the combustion tube 332. The flame F formed near the inlet disc 330 is preferably stable and convergent. Third, fuel combustion requires only a small amount of oxygen, so the smaller first set of openings 3331 can maintain a small amount of air and oxygen entering the combustion tube assembly 33 to achieve the desired flame quantity and shape. The flame is preferably thin and narrow. Fourth, the larger third set of openings 3333 at the outlet disc 331 helps to blow the burning flame F out of the outlet end of the combustion tube assembly 33. The second set of openings 3332 and the third set of openings 3333 allow more oxygen to enter the combustion tube 332, ensuring better mixing of fuel and oxygen, and pushing the flame F from the combustion tube 332 toward the axis P, and thus toward the outlet 301. The combustion tube assembly 33 results in minimal contact between the flame F and the combustion tube 332, thus the combustion device 1 and the combustion assembly 3 are cooled down during the operation of the combustion device 1.

[0053] To ensure combustion safety, combustion assembly 3 includes a sensor 35 for monitoring and detecting the formation of flame F. Specifically, the welding operator can operate combustion device 1 with sensor 35 by following these steps: (A) starting air compressor assembly 2, (B) starting ignition device 32, (C) supplying fuel by fuel device 31, and (D) detecting the presence of flame F by sensor 35. If sensor 35 does not detect a flame, the welding operator will check or restart combustion device 1 to ensure safe operation.

[0054] Figure 1 It is equipped in ​A perspective view of the preheating device on the combustion apparatus. The preheating device 6 for heating railway maintenance molds includes a preheating device body 60 and a combustion device 1. The combustion device 1 is housed in the preheating device body 60, with its axis P aligned with the railway track. Therefore, the welding operator can operate the preheating device 6 to heat the rails.

[0055] Although the invention has been explained with reference to its preferred embodiments described above, it should be understood that many other possible modifications and variations can be made without departing from the scope of the invention. Therefore, it is intended that the appended claims cover such modifications and variations that fall within the true scope of the invention.

[0056] Component Name

[0057] 1. Combustion device

[0058] 2. Air compressor assembly

[0059] 20 Air Intake

[0060] 21 Air outlet

[0061] 22 Main Body

[0062] 220 outer casing

[0063] 221 Inner Shell

[0064] 2210 Inner shell opening

[0065] 2211 Cavity

[0066] 222 Air passage

[0067] 223 Line Channel

[0068] 224 ribs

[0069] 23 Motors

[0070] 230 motor shaft

[0071] 24 propellers

[0072] 25 Covers

[0073] 26 Plastic mounting plate

[0074] 27 Metal mounting plate

[0075] 28 screws

[0076] 3 Combustion Components

[0077] 30 Combustion assembly housing

[0078] 300 air intake

[0079] 301 Air outlet

[0080] 31 Fueling device

[0081] 32 Ignition device

[0082] 33 Combustion Tube Assembly

[0083] 330 Entry Disk

[0084] 3300 Opening of the entry plate

[0085] 331 Export Disk

[0086] 332 combustion tube body

[0087] 333 Opening

[0088] 3331 First group of openings

[0089] 3332 Second group of openings

[0090] 3333 Third group of openings

[0091] 34 Air passages

[0092] 35 sensors

[0093] 4. Fuel supply device

[0094] 5. Electrical installations

[0095] 6. Preheating device

[0096] 60. Main body of the preheating device

[0097] F Flame

[0098] P-axis

[0099] G airflow.

Claims

1. A combustion device for railway maintenance, defining an axis (P) and comprising: An air compressor assembly (2) includes an air inlet (20) and an air outlet (21), and A combustion assembly (3) is connected to the air outlet (21) of the air compressor assembly (2). The air compressor assembly (2) and the combustion assembly (3) are arranged axially along the axis (P), and the air compressor assembly (2) compresses air into the combustion assembly (3). The air compressor assembly (2) further includes: A main body (22) is arranged axially along axis (P). An electric motor (23), comprising a motor shaft (230) disposed within the main body (22), and A propeller (24), driven by the motor (23) via the motor shaft (230), guides air into the body (22). The main body (22) includes: An outer shell (220), and An inner housing (221) is disposed within and connected to the outer housing (220), and the motor (23) is disposed therein. An air passage (222) is defined between the inner housing (221) and the outer housing (220), and the propeller (24) guides air from the air compressor assembly (2) through the air passage (222) into the combustion assembly (3). The inner housing (221) of the main body (22) includes an inner housing opening (2210) that allows air to flow from the air passage (222) into the inner housing (221) to cool the motor (23).

2. The combustion device according to claim 1, wherein the main body (22) further includes a rib (224) in the air passage (222) connecting the outer shell (220) and the inner shell (221).

3. The combustion device according to any one of claims 1-2, wherein the air compressor assembly (2) further comprises a cover (25) configured to guide air into the air inlet (20) of the air compressor assembly (2).

4. The combustion device according to claim 3, wherein the air compressor assembly (2) further comprises: A plastic mounting plate (26) receiving the propeller (24) and disposed between the cover (25) and the body (22), and A metal mounting plate (27) is placed between the plastic mounting plate (26) and the body (22) to reinforce the air compressor assembly (2).

5. The combustion apparatus according to any one of claims 1-2, wherein the combustion component (3) comprises: A combustion assembly housing (30) includes an air inlet (300) and an air outlet (301), wherein the air inlet (300) of the combustion assembly housing (30) communicates with the air outlet (21) of the air compressor assembly (2). A fueling device (31) for supplying fuel to the combustion assembly (3), and An ignition device (32) is used to ignite the fuel. The ignition device (32) ignites the fuel in the combustion assembly (3) to produce a flame (F).

6. The combustion apparatus according to claim 5, wherein the combustion assembly (3) further comprises the combustion tube assembly (33) disposed in the combustion assembly housing (30), the combustion tube assembly (33) comprising: One entry plate (330), One export plate (331), and A combustion tube (332) is configured to be hollow and is arranged along the axis (P) in the combustion assembly housing (30), and is located between the inlet disc (330) and the outlet disc (331). An air passage (34) is defined between the combustion tube (332) and the combustion assembly housing (30), and The air passage (222) of the air compressor assembly (2), the air passage (34) of the combustion assembly (3), the combustion tube (332), and the air outlet (301) of the combustion assembly (3) are designed to communicate with each other.

7. The combustion apparatus according to claim 6, wherein the combustion tube (332) includes an opening (333) designed along the combustion tube (332) to control the amount of air entering the combustion tube (332) from the air passage (34), wherein combustion of the fuel and air mixture occurs in the combustion tube (332).

8. The combustion apparatus according to claim 7, wherein the opening (333, 3331) of the combustion tube (332) near the inlet disc (330) is designed to be smaller than the opening (333, 3333) of the combustion tube (332) near the outlet disc (331).

9. The combustion device according to claim 5, wherein the combustion component (3) includes a sensor (35) for monitoring and detecting the presence of a flame (F).

10. The combustion apparatus according to claim 5, wherein the fuel device (31) is connected to a fuel supply device (4), and the ignition device (32) is connected to an electrical device (5).

11. The combustion device according to claim 3, wherein the body (22) of the air compressor assembly (2) is constructed as a whole, and the cover (25) and the body (22) are constructed as a whole.

12. The combustion device according to any one of claims 1-2, wherein the air compressor assembly (2) and the combustion assembly (3) are constructed as a single unit.

13. A preheating device for railway maintenance, comprising: A preheating device body (60), and A combustion device (1) according to any one of claims 1-12, which is placed in the preheating device, in, The preheating device (6) is operated on the railway track to heat the railway.

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