Gas heating device

Abstract

The present invention provides a gas heating device, which relates to the field of gas heating technology. The gas heating device includes an air inlet end cover, a main body and an air outlet end cover; the air inlet end cover and the air outlet end cover are respectively arranged at the two ends of the main body; a plurality of spiral flow channels are arranged in the main body, the air inlet end cover is provided with a first turning groove, the air outlet end cover is provided with a second turning groove, the first turning groove is connected to the same end of at least two spiral flow channels, and the second turning groove is connected to the first turning groove through the spiral flow channel, and is also connected to at least one end of another spiral flow channel. The gas heating device of the present application can significantly increase the retention time of the gas, and the spiral flow channel can effectively increase the heat exchange area between the gas and the gas flow channel, thereby improving the heating effect of the gas heating device on the gas and improving the heating efficiency.

Description

Technical Field

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

[0002] The gas heating device is a device for heating and raising the temperature of the gas flow. Its working principle is that after the gas is passed into the gas flow channel, the inner wall of the gas flow channel transfers heat to the gas, thereby raising the temperature of the gas. However, the gas flow channels in the existing gas heating devices are mostly unidirectional cylindrical gas flow channels; the gas has a short residence time in the gas flow channel, and the heat exchange area between the inner wall of the cylindrical gas flow channel and the gas is small, which affects the heating efficiency of the gas heating device for the gas. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the present invention provides a gas heating device.

[0004] The present invention provides the following technical solutions:

[0005] A gas heating device, comprising an air inlet end cover, a main body and an air outlet end cover; the air inlet end cover and the air outlet end cover are respectively arranged at two ends of the main body; a plurality of spiral flow channels are arranged in the main body, the air inlet end cover is provided with a first turning groove, the air outlet end cover is provided with a second turning groove, the first turning groove is connected to the same end of at least two of the spiral flow channels, the second turning groove is connected to the first turning groove through the spiral flow channel, and is also connected to at least one end of another spiral flow channel.

[0006] In a possible embodiment, a first protrusion and a second protrusion are respectively provided at both ends of the main body; the flow channel inlet and the flow channel outlet are respectively opened on the first protrusion and the second protrusion; a first cavity corresponding to the first protrusion is opened on the air inlet end cover, and the first turning groove is opened on the inner wall of the first cavity; a second cavity corresponding to the second protrusion is opened on the air outlet end cover, and the second turning groove is opened on the inner wall of the second cavity.

[0007] In a possible embodiment, the first steering groove is opened on the first contact surface of the first cavity; a first boss is provided on the second contact surface of the first protrusion, and the flow channel inlet is opened on the first boss; the first contact surface is abutted against the second contact surface, and the first boss is arranged in the first steering groove; a second boss is provided on the third contact surface of the second protrusion, and the flow channel outlet is opened on the second boss; the second steering groove is opened on the fourth contact surface of the second cavity; the third contact surface is abutted against the fourth contact surface, and the second boss is arranged in the second steering groove.

[0008] In a possible embodiment, a plurality of the first steering grooves are formed on the first contact surface, a plurality of the first bosses are formed on the second contact surface, and the plurality of the first bosses are respectively arranged in the corresponding first steering grooves; a plurality of the second steering grooves are formed on the fourth contact surface, a plurality of the second bosses are formed on the third contact surface, and the plurality of the second bosses are respectively arranged in the corresponding second steering grooves.

[0009] In a possible implementation manner, a plurality of flow channel inlets are formed on the first boss, and a plurality of flow channel outlets are formed on the second boss.

[0010] In a possible embodiment, the extension direction of the plurality of spiral flow channels is the axial direction of the main body, and the opening shape of the flow channel inlet on the first boss is spiral, and the opening shape of the flow channel outlet on the second boss corresponds to the shape of the flow channel inlet.

[0011] In a possible implementation, the main body includes a first heat-conducting tube and a second heat-conducting tube, the second heat-conducting tube is arranged in the first heat-conducting tube; the spiral flow channel is provided on both the first heat-conducting tube and the second heat-conducting tube; the thermal conductivity of the first heat-conducting tube is greater than the thermal conductivity of the second heat-conducting tube.

[0012] In a possible implementation manner, the gas heating device further includes a sealing member, wherein the sealing member is provided between the gas inlet end cover and the main body, and between the gas outlet end cover and the main body.

[0013] In a possible embodiment, the seal includes a first seal and a second seal; a first sealing groove is provided on the air inlet end cover, a second sealing groove is provided at the end of the main body away from the air outlet end cover, and the first seal is arranged between the first sealing groove and the second sealing groove; a third sealing groove is provided at the end of the main body away from the air inlet end cover, a fourth sealing groove is provided on the air outlet end cover, and the second seal is arranged between the third sealing groove and the fourth sealing groove.

[0014] In a possible embodiment, the gas heating device also includes a first connecting member, an air inlet pipe, a second connecting member and an air outlet pipe; the first connecting member is connected to the air inlet end cover through the air inlet pipe, and the second connecting member is connected to the air outlet end cover through the air outlet pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The gas heating device provided by the embodiment of the present application, by arranging multiple spiral flow channels in the main body, the gas can exchange heat with the inner wall of the spiral flow channel to heat the gas; the air inlet end cover can inject gas into a spiral flow channel to make the gas flow into the second turning groove on the air outlet end cover; since the second turning groove is connected to the same end of at least two spiral flow channels, after the flow direction of the gas changes in the second turning groove, the gas can flow into the first turning groove on the air inlet end cover through other spiral flow channels connected to the second turning groove; since the first turning groove is also connected to at least one end of another spiral flow channel, after the flow direction of the gas changes in the first turning groove, the gas flows again in the direction of the second turning groove; this cycle is repeated until the gas is discharged outward through the air outlet end cover. The gas heating device of the present application can significantly increase the retention time of the gas, and the spiral flow channel can effectively increase the heat exchange area between the gas and the gas flow channel, thereby improving the heating effect of the gas heating device on the gas and improving the heating efficiency.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 An exploded schematic diagram of a gas heating device according to an embodiment of the present invention is shown;

[0020] Figure 2 A schematic diagram of the structure of an air intake end cover according to an embodiment of the present invention is shown;

[0021] Figure 3 It shows a schematic structural diagram of a main body of an embodiment of the present invention from a first viewing angle;

[0022] Figure 4 A schematic diagram showing the structure of a main body of an embodiment of the present invention from a second viewing angle is shown;

[0023] Figure 5 A schematic diagram of the structure of an air outlet cover according to an embodiment of the present invention is shown;

[0024] Figure 6 A partial cross-sectional view of a gas heating device according to an embodiment of the present invention is shown;

[0025] Figure 7A schematic structural diagram of a gas heating device according to an embodiment of the present invention is shown.

[0026] Description of main component symbols:

[0027] 100-intake end cover; 110-intake hole; 120-first cavity; 121-first contact surface; 122-first turning groove; 123-first sealing groove; 200-main body; 210-first protrusion; 211-second contact surface; 220-first boss; 230-second sealing groove; 240-spiral flow channel; 241-flow channel inlet; 242-flow channel outlet; 250-second protrusion; 251-third contact surface ; 260-second boss; 270-third sealing groove; 280-first heat-conducting tube; 281-second heat-conducting tube; 300-air outlet cover; 310-air outlet hole; 320-second cavity; 321-fourth contact surface; 322-second turning groove; 323-fourth sealing groove; 400-inlet pipe; 500-first connecting piece; 600-outlet pipe; 700-second connecting piece; 800-sealing piece; 900-fixing piece. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] Embodiment 1

[0034] See also Figures 1 to 5 In one embodiment of the present invention, a gas heating device is provided. The gas heating device is used to heat gas.

[0035] See also Figure 1 and Figure 2 The gas heating device includes an air inlet end cover 100, a main body 200 and an air outlet end cover 300; the air inlet end cover 100 and the air outlet end cover 300 are respectively arranged at the two ends of the main body 200; a plurality of spiral flow channels 240 are arranged in the main body 200, the air inlet end cover 100 is provided with a first turning groove 122, and the air outlet end cover 300 is provided with a second turning groove 322; the second turning groove 322 is connected to the same end of at least two of the spiral flow channels 240, and the first turning groove 122 is connected to the second turning groove 322, and is also connected to at least one end of another spiral flow channel 240.

[0036] The air inlet cover 100 can inject gas with a relatively low temperature into the first spiral flow channel; the gas in the first spiral flow channel exchanges heat with the inner wall of the first spiral flow channel, thereby increasing the temperature.

[0037] The gas enters the second turning groove 322 through the first spiral flow channel, and the flow direction of the gas can be changed in the second turning groove 322 so that the gas enters the second spiral flow channel. The gas enters the first turning groove 122 through the second spiral flow channel, and the flow direction of the gas changes in the first turning groove 122 so that the gas enters the third spiral flow channel; this cycle is repeated until the gas is discharged through the gas outlet cover 300.

[0038] Compared with a cylindrical flow channel, the spiral flow channel 240 can effectively increase the heat exchange area between the gas and the inner wall of the flow channel, so that the gas can be fully heated; when the gas heating device is working, the gas can flow in the multiple spiral flow channels 240 in turn, and exchange heat with the inner walls of the multiple spiral flow channels 240 respectively, thereby greatly increasing the residence time of the gas in the heating device, and then extending the heating time of the gas.

[0039] The gas heated by the gas heating device may be any one of gases such as air, oxygen, nitrogen, etc., or a mixed gas of multiple gases.

[0040] In some embodiments, when the gas is air, the gas heating device is used in a wind tunnel test equipment; the gas heating device can quickly heat the air and discharge it into a laboratory of the wind tunnel test equipment, so that the aircraft can simulate a specific flight environment in the wind tunnel test equipment.

[0041] In other embodiments, when the gas is oxygen, the gas heating device is used in a gas cutting device; the high-temperature oxygen discharged from the gas outlet cover 300 can be used to accurately cut metals with a lower melting point, or to carve on the metal surface.

[0042] See also Figures 2 to 5 The two ends of the main body 200 are respectively provided with a first protrusion 210 and a second protrusion 250; the flow channel inlet 241 and the flow channel outlet 242 of the spiral flow channel 240 are respectively opened on the first protrusion 210 and the second protrusion 250.

[0043] The air inlet end cover 100 is provided with a first cavity 120 corresponding to the first protrusion 210, and the first turning groove 122 is provided on the first contact surface 121 of the first cavity 120; the air outlet end cover 300 is provided with a second cavity 320 corresponding to the second protrusion 250, and the second turning groove 322 is provided on the fourth contact surface 321 of the second cavity 320; the flow channel inlet 241 corresponds to the first turning groove 122, and the flow channel outlet 242 corresponds to the second turning groove 322.

[0044] The first protrusion 210 is at the left end of the main body 200 and extends outward along the axial direction of the main body 200; the second protrusion 250 is at the right end of the main body 200 and extends outward along the axial direction of the main body 200, and the extension directions of the first protrusion 210 and the second protrusion 250 are parallel and opposite. The opening direction of the first cavity 120 on the air inlet cover 100 is parallel to the extension direction of the first protrusion 210 on the main body 200; the opening direction of the second cavity 320 on the air outlet cover 300 is parallel to the extension direction of the second protrusion 250 on the main body 200.

[0045] When the air inlet cover 100 and the air outlet cover 300 are respectively fixed to the two ends of the main body 200 , the first protrusion 210 is disposed in the first cavity 120 , and the second protrusion 250 is disposed in the second cavity 320 .

[0046] A plurality of first turning grooves 122 are provided on the first contact surface 121, a plurality of first bosses 220 are provided on the second contact surface 211 of the first protruding portion 210, the plurality of first bosses 220 are respectively arranged in the corresponding first turning grooves 122, and the first contact surface 121 is abutted against the second contact surface 211; one or more flow channel inlets 241 are provided on the first boss 220.

[0047] The fourth contact surface 321 is provided with a plurality of second turning grooves 322, the third contact surface 251 of the second protrusion 250 is provided with a plurality of second bosses 260, the plurality of second bosses 260 are respectively arranged in the corresponding second turning grooves 322, and the third contact surface 251 is abutted against the fourth contact surface 321; the second boss 260 is provided with one or more flow channel outlets 242.

[0048] The air inlet end cover 100 is further provided with an air inlet hole 110 , and the air inlet hole 110 corresponds to the flow channel inlet 241 of the spiral flow channel 240 ; the gas can enter the spiral flow channel 240 through the air inlet hole 110 and the flow channel inlet 241 in sequence.

[0049] The outlet end cover 300 is also provided with an outlet hole 310 , which corresponds to the flow channel outlet 242 of the spiral flow channel 240 ; the gas in the spiral flow channel 240 can be discharged to the outside of the outlet end cover 300 through the flow channel outlet 242 and the outlet hole 310 in sequence.

[0050] The gas flows into the spiral flow channel 240 through the air inlet 110 and the flow channel inlet 241 in sequence; the air outlet 310 is connected to the second turning groove 322, and the gas in the spiral flow channel 240 flows into the second turning groove 322 through the flow channel outlet 242, and then is discharged outward through the air outlet 310.

[0051] In some embodiments, one or more flow channel inlets 241 are formed on the first boss 220 , and one or more flow channel outlets 242 are formed on the second boss 260 .

[0052] In this embodiment, the flow channel inlet 241 of the first spiral flow channel is the first flow channel inlet, the flow channel outlet 242 of the first spiral flow channel is the first flow channel outlet, and so on.

[0053] See also Figure 3 In some embodiments, the first first boss is a cylindrical boss, and the first first boss is arranged at the center of the first protrusion 210, and the first first boss is provided with a first flow channel inlet; the remaining first bosses are all arc-shaped bosses, and are arranged circumferentially around the first first boss, and except for the first first boss, the remaining first bosses are provided with a plurality of flow channel inlets 241.

[0054] See also Figure 4 On the second protrusion 250, a first second boss is provided at a position corresponding to the first first boss, and a first flow channel outlet corresponding to the first flow channel inlet is provided on the first second boss; the remaining second bosses are all arc-shaped bosses and are arranged circumferentially around the first second boss.

[0055] It is worth noting that the flow channel inlet 241 on the arc-shaped first boss 220 does not correspond one-to-one to the flow channel outlet 242 on the arc-shaped second boss 260 .

[0056] The gas is injected into the first spiral flow channel through the air inlet 110 and the first flow channel inlet in sequence, and the gas flows into the first second turning groove through the first flow channel outlet. Since the flow channel outlets 242 of the first spiral flow channel, the second spiral flow channel and the third spiral flow channel are all connected to the first second turning groove, the flow direction of the gas changes in the first second turning groove, and the gas enters the second spiral flow channel and the third spiral flow channel through the second flow channel outlet and the third flow channel outlet respectively.

[0057] The gas flows along the second spiral flow channel and the third spiral flow channel respectively toward the direction close to the air intake end cover 100 until it flows into the first first turning groove. Since the second flow channel inlet, the third flow channel inlet and the fourth flow channel inlet are all connected to the first first turning groove, the flow direction of the gas changes in the second first turning groove, so that the gas flows into the fourth spiral flow channel through the fourth flow channel inlet, and so on, until the gas finally flows into the second turning groove 322 connected to the gas outlet.

[0058] By means of the above method, the residence time of the gas in the main body 200 can be greatly increased, thereby effectively increasing the temperature of the gas after heating.

[0059] The extension direction of the multiple spiral flow channels 240 is the axial direction of the main body 200, and the opening shape of the flow channel inlet 241 on the first boss 220 is spiral, and the opening shape of the flow channel outlet 242 on the second boss 260 corresponds to the shape of the flow channel inlet 241 and is also spiral.

[0060] The spiral flow channel 240 can be processed on the main body 200 by wire cutting process.

[0061] The gas heating device further comprises a heater, which is used to heat the main body 200, so as to make the inner wall of the spiral flow channel 240 exchange heat with the gas. The heater is an eddy current heater.

[0062] The gas heating device provided in this embodiment is configured with a plurality of spiral flow channels 240 in the main body 200, so that the gas can exchange heat with the inner wall of the spiral flow channel 240 to heat the gas; the air inlet end cover 100 can inject the gas into one of the spiral flow channels 240 to make the gas flow into the second turning groove 322 on the air outlet end cover 300; since the second turning groove 322 is connected to the same end of at least two of the spiral flow channels 240, after the flow direction of the gas changes in the second turning groove 322, the gas can flow into the first turning groove 122 on the air inlet end cover 100 through other spiral flow channels 240 connected to the second turning groove 322; since the first turning groove 122 is also connected to at least one end of another spiral flow channel 240, after the flow direction of the gas changes in the first turning groove 122, the gas flows again in the direction of the second turning groove 322; this cycle is repeated until the gas is discharged outward through the air outlet end cover 300. The gas heating device of the present application can significantly increase the residence time of the gas, and the spiral flow channel 240 can effectively increase the heat exchange area between the gas and the gas flow channel, thereby improving the heating effect of the gas heating device on the gas and improving the heating efficiency.

[0063] Embodiment 2

[0064] See also Figures 1 to 7 This embodiment provides a gas heating device. This embodiment is an improvement made on the technical basis of the above embodiment 1. Compared with the above embodiment 1, the difference is that:

[0065] See also Figure 6 and Figure 7 The gas heating device further includes a fixing member 900 , and the fixing member 900 is used to fix the air inlet end cover 100 and the main body 200 , and to fix the air outlet end cover 300 and the main body 200 .

[0066] In some embodiments, a first fixing portion is provided on the air inlet end cover 100, and a second fixing portion is provided at one end of the main body 200 away from the air outlet end cover 300, and the fixing member 900 can fix the first fixing portion and the second fixing portion to fix the air inlet end cover 100 to the main body 200.

[0067] The first fixing portion is provided with a first through hole, and the second fixing portion is provided with a second through hole; the fixing member 900 is a bolt, and the fixing member 900 passes through the first through hole and the second through hole in sequence, and cooperates with a nut to fix the first fixing portion and the second fixing portion in connection.

[0068] The main body 200 is provided with a third fixing portion at one end away from the air inlet end cover 100, and the air outlet end cover 300 is provided with a fourth fixing portion. The fixing member 900 can also be fixedly connected with the fourth fixing portion by cooperating with a nut.

[0069] The gas heating device also includes a seal 800, which includes a first seal 800 and a second seal 800; the first seal 800 is used to seal the gap between the air inlet end cover 100 and the first protrusion 210, and the second seal 800 is used to seal the gap between the air outlet end cover 300 and the second protrusion 250.

[0070] Combination Figure 2 and Figure 3 As shown, a first sealing groove 123 is provided on the outer side of the first cavity 120 , and a second sealing groove 230 corresponding to the first sealing groove 123 is provided on the outer side of the first protrusion 210 ; the first sealing member 800 is provided between the first sealing groove 123 and the second sealing groove 230 .

[0071] Combination Figure 4 and Figure 5 As shown, a third sealing groove 270 is provided on the outer side of the second protrusion 250 , and a fourth sealing groove 323 corresponding to the third sealing groove 270 is provided on the outer side of the second cavity 320 ; the second sealing member 800 is provided between the third sealing groove 270 and the fourth sealing groove 323 .

[0072] The sealing member 800 is an octagonal gasket, which has a self-tightening feature. When the internal air pressure increases, the sealing performance of the octagonal gasket also increases.

[0073] See also Figure 7 The gas heating device also includes a first connecting member 500, an air inlet pipe 400, a second connecting member 700 and an air outlet pipe 600; the first connecting member 500 is connected to the air inlet end cover 100 through the air inlet pipe 400, and the second connecting member 700 is connected to the air outlet end cover 300 through the air outlet pipe 600.

[0074] The first connecting member 500 is used to connect a gas manufacturing device or a gas storage device so as to inject the gas to be heated into the air inlet end cover 100; the second connecting member 700 is used to connect a nozzle of a gas cutting device or a laboratory of a wind tunnel test device so as to use the heated gas.

[0075] The first connecting member 500 and the second connecting member 700 are both flanges; the air inlet pipe 400 and the air outlet pipe 600 are both conical pipes, and both ends of the air inlet pipe 400 are provided with a first external thread, and the air inlet pipe 400 is respectively connected to the first connecting member 500 and the air inlet hole 110 through a threaded structure; both ends of the air outlet pipe 600 are provided with a second external thread, and the air outlet pipe 600 is respectively connected to the second connecting member 700 and the air outlet hole 310 through a threaded structure.

[0076] In some embodiments, see Figure 4 The main body 200 includes a first heat-conducting tube 280 and a second heat-conducting tube 281 . The second heat-conducting tube 281 is disposed in the first heat-conducting tube 280 . The spiral flow channel 240 is disposed on both the first heat-conducting tube 280 and the second heat-conducting tube 281 .

[0077] The first heat-conducting tube 280 is a stainless steel tube, the second heat-conducting tube 281 is a copper tube, and the thermal conductivity of the second heat-conducting tube 281 is greater than the thermal conductivity of the first heat-conducting tube 280; the heater of the gas heating device can heat the first heat-conducting tube 280, and the first heat-conducting tube 280 can transfer heat to the second heater 281, thereby improving the stability of the gas during heating.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A gas heating device, characterized in that: It comprises an air inlet cover, a main body and an air outlet cover; the air inlet cover and the air outlet cover are respectively arranged at two ends of the main body; a plurality of spiral flow channels are arranged in the main body, the air inlet cover is provided with a first turning groove, the air outlet cover is provided with a second turning groove, the first turning groove is connected to the same end of at least two of the spiral flow channels, the second turning groove is connected to the first turning groove through the spiral flow channel, and is also connected to at least one end of another spiral flow channel; The two ends of the main body are respectively provided with a first protrusion and a second protrusion; the flow channel inlet and the flow channel outlet of the spiral flow channel are respectively provided on the first protrusion and the second protrusion; the air inlet end cover is provided with a first cavity corresponding to the first protrusion, and the first turning groove is provided on the inner wall of the first cavity; the air outlet end cover is provided with a second cavity corresponding to the second protrusion, and the second turning groove is provided on the inner wall of the second cavity; The first steering groove is provided on the first contact surface of the first cavity; a first boss is provided on the second contact surface of the first protruding portion, and the flow channel inlet is provided on the first boss; the first contact surface is abutted against the second contact surface, and the first boss is provided in the first steering groove; a second boss is provided on the third contact surface of the second protruding portion, and the flow channel outlet is provided on the second boss; the second steering groove is provided on the fourth contact surface of the second cavity; the third contact surface is abutted against the fourth contact surface, and the second boss is provided in the second steering groove; The first contact surface is provided with a plurality of the first steering grooves, the second contact surface is provided with a plurality of the first bosses, and the plurality of the first bosses are respectively arranged in the corresponding first steering grooves; the fourth contact surface is provided with a plurality of the second steering grooves, the third contact surface is provided with a plurality of the second bosses, and the plurality of the second bosses are respectively arranged in the corresponding second steering grooves.

2. The gas heating device according to claim 1, characterized in that: The first boss is provided with a plurality of flow channel inlets, and the second boss is provided with a plurality of flow channel outlets.

3. The gas heating device according to claim 1, characterized in that: The extension direction of the plurality of spiral flow channels is the axial direction of the main body, and the opening shape of the flow channel inlet on the first boss is spiral, and the opening shape of the flow channel outlet on the second boss corresponds to the shape of the flow channel inlet.

4. The gas heating device according to claim 1, characterized in that: The main body comprises a first heat-conducting tube and a second heat-conducting tube, wherein the second heat-conducting tube is arranged inside the first heat-conducting tube; the spiral flow channel is arranged on both the first heat-conducting tube and the second heat-conducting tube; The thermal conductivity of the first heat-conducting tube is greater than the thermal conductivity of the second heat-conducting tube.

5. The gas heating device according to claim 1, characterized in that: The gas heating device further comprises a sealing member, wherein the sealing member is arranged between the gas inlet end cover and the main body, and between the gas outlet end cover and the main body.

6. The gas heating device according to claim 5, characterized in that: The seal includes a first seal and a second seal; a first sealing groove is provided on the air inlet end cover, a second sealing groove is provided at one end of the main body away from the air outlet end cover, and the first seal is arranged between the first sealing groove and the second sealing groove; a third sealing groove is provided at one end of the main body away from the air inlet end cover, a fourth sealing groove is provided on the air outlet end cover, and the second seal is arranged between the third sealing groove and the fourth sealing groove.

7. The gas heating device according to claim 1, characterized in that: The gas heating device also includes a first connecting member, an air inlet pipe, a second connecting member and an air outlet pipe; the first connecting member is connected to the air inlet end cover via the air inlet pipe, and the second connecting member is connected to the air outlet end cover via the air outlet pipe.

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