Multi-path gas mixing device capable of realizing heating and heat preservation

Abstract

The invention provides a multipath gas mixing device capable of realizing heating and heat preservation, the multipath gas mixing device comprises a heat preservation shell and a mixing main body arranged in the heat preservation shell, a mixing channel is formed in the mixing main body, a heat preservation cavity is formed between the mixing main body and the heat preservation shell, and a heat preservation medium flows in the heat preservation cavity; a plurality of air inlet holes and an air outlet hole are formed in the top of the mixing main body; the air outlet hole and the plurality of air inlet holes are respectively communicated with the mixing channel; and the mixing channel is a snake-shaped channel. According to the multi-path gas mixing device capable of realizing heating and heat preservation, provided by the invention, various gases can impact the inner wall of the mixing channel in the mixing channel to change the direction, and irregular vortex is formed, so that the various gases can be mixed more uniformly; the heat preservation medium provides heat, so that the gas in the mixing channel is always in a high-temperature environment, the rare earth chelate is always in a gaseous state, and the mixing quality of various gases is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of gas mixing, and in particular relates to a multi-channel gas mixing device capable of realizing heating and heat preservation. Background Art

[0002] Rare earth doped preform is a kind of optical fiber preform, which is the key raw material of optical fiber devices and optical fiber lasers. Rare earth doped preform is widely used in conventional communication field, consumer electronics and material processing field. The preparation method of rare earth doped preform is generally based on chemical vapor deposition of rare earth chelate.

[0003] In the chemical vapor deposition method, rare earth chelates, silicon tetrachloride, germanium tetrachloride, oxygen, helium and other gases need to be fed into a quartz reaction tube, and then react and deposit at high temperature. Currently, various raw material gases are transported separately through their own pipelines and connected to the quartz reaction tube at the end.

[0004] Since the gas inlet of the quartz reaction tube contains multiple gas pipeline entrances, it is easy for the gas flow in the quartz reaction tube to be turbulent and uneven, resulting in inconsistent concentration ratios of multiple gases in the quartz reaction tube in the axial direction. This greatly affects the axial uniformity of the final preform rod and restricts the continuous length and yield rate of the optical fiber; and the rare earth chelate is generally heated at high temperature (usually greater than 100°C) to cause it to be converted from a powdery solid to a gaseous state, and then carried by a carrier gas to the quartz reaction tube for reaction and deposition. However, the mixing environment temperature of the existing quartz reaction tube is low, which easily causes the temperature of the rare earth chelate to drop during the mixing process, causing the gaseous rare earth chelate to become a powdery solid, resulting in cost waste, affecting the processing quality of the preform rod, and the steps for handling the rare earth chelate in the quartz reaction tube are cumbersome, which increases the difficulty of cleaning. Summary of the invention

[0005] The embodiment of the present invention provides a multi-channel gas mixing device capable of achieving heating and heat preservation, aiming to solve the technical problem that uneven gas ratio is easily generated when raw materials of rare earth-doped preform are mixed, rare earth chelates condense at low temperature, and the production quality of rare earth-doped preform is affected.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A multi-channel gas mixing device capable of achieving heating and heat preservation is provided, comprising a heat-insulating outer shell and a mixing body arranged inside the heat-insulating outer shell, a mixing channel is formed inside the mixing body, a heat-insulating cavity is formed between the mixing body and the heat-insulating outer shell, a heat-insulating medium flows in the heat-insulating cavity; a plurality of air inlets and an air outlet are provided on the top of the mixing body, the air outlet is connected to one end of the mixing channel correspondingly, and a plurality of air inlets are connected to the other end of the mixing channel correspondingly; the mixing channel is a serpentine channel.

[0007] In a possible implementation, a liquid outlet and a liquid inlet are respectively provided on two opposite sides of the heat-insulating shell, and the liquid inlet and the liquid outlet are respectively connected to the heat-insulating cavity.

[0008] In a possible implementation, the thermal insulation shell includes a containing box with an opening at the top and a cover plate arranged on the top of the containing box; the cover plate and the containing box are sealed and connected by fasteners; the mixing body is arranged inside the containing box, the cover plate cooperates with the mixing body to form the sealed mixing channel, the cover plate, the containing box and the mixing body are enclosed to form the thermal insulation cavity, and the cover plate is provided with a plurality of the air inlet holes and the air outlet holes.

[0009] In a possible implementation, the mixing body includes a plurality of baffles connected end to end, the surface of the baffles is perpendicular to the up and down direction, the bottom of the baffles is sealed with the containing box, and the top surface of the baffles is tightly abutted with the lower surface of the cover plate; the plurality of baffles, the bottom surface of the containing box and the cover plate enclose the mixing channel, and the cover plate is provided with the air inlet and the air outlet.

[0010] In a possible implementation, the cover plate and the containing box are both made of stainless steel.

[0011] In a possible implementation, the mixing channel includes a plurality of first channels arranged at intervals, and a second channel whose two ends are connected to the same side of two adjacent first channels, and the first channel and the second channel are arranged at an angle to form the tortuous mixing channel.

[0012] In a possible implementation, the mixing body includes a first plate and a second plate spaced apart along a first horizontal direction, and a third plate and a fourth plate spaced apart along a second horizontal direction, the first horizontal direction and the second horizontal direction being perpendicular to each other; the first channel is formed between the first plate and the second plate, and the second channel is formed between the third plate and the fourth plate; A distance between the first plate and the second plate is greater than a distance between the third plate and the fourth plate.

[0013] In a possible implementation manner, a plurality of spoilers are provided on the inner wall of the mixing channel.

[0014] In a possible implementation, the air outlet and the plurality of air inlet holes are respectively connected to air pipes.

[0015] In a possible implementation manner, a sealing gasket is provided between the cover plate and the top opening of the containing box.

[0016] The multi-channel gas mixing device capable of achieving heating and heat preservation provided by the present invention is provided with a mixing channel and a heat preservation chamber arranged around the mixing channel, a heat preservation medium is arranged in the heat preservation chamber, a plurality of raw material gases enter the mixing channel from corresponding air inlets, the mixing channel is a serpentine channel, which can guide and restrict the flow direction of the gas, the plurality of gases will collide with the inner wall of the mixing channel in the mixing channel to change the direction, form irregular vortices, so that the plurality of gases can be mixed more evenly; the air inlet and the air outlet are both provided at the top of the mixing channel, so that the inflow and outflow direction of the gas is perpendicular to the flow direction of the gas in the mixing channel, at least two forced changes in direction will occur when the gas flows, further enhancing the irregularity of the gas flow and improving the mixing uniformity of the plurality of gases; the heat preservation medium provides heat, so that the gas in the mixing channel is always in a high temperature environment, ensuring that the rare earth chelate is always in a gaseous state, and ensuring the mixing quality of the plurality of gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the explosion structure of a multi-channel gas mixing device capable of achieving heating and heat preservation provided by an embodiment of the present invention; Figure 2 for Figure 1 A top view of the containing box used in the embodiment; Figure 3 for Figure 1 Bottom view of the cover plate used in.

[0019] Description of reference numerals: 1. Insulation shell; 11. Accommodation box; 111. Insulation chamber; 112. Liquid outlet; 113. Liquid inlet; 12. Cover plate; 121. Air inlet; 122. Air outlet; 13. Fastener; 14. Air pipe; 2. Mixing body; 20. Mixing channel; 201. First channel; 202. Second channel; 21. First plate; 22. Second plate; 23. Third plate; 24. Fourth plate; 25. Spoiler. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] It should be noted that the directions or positional relationships indicated by terms such as “length”, “width”, “height”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “head” and “tail” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the invention.

[0022] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; 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.

[0023] 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 addition, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0024] Please also read Figures 1 to 3 Now, the multi-channel gas mixing device capable of achieving heating and heat preservation provided by the present invention is described. The multi-channel gas mixing device capable of achieving heating and heat preservation comprises a heat-insulating outer shell 1 and a mixing body 2 arranged inside the heat-insulating outer shell 1, a mixing channel 20 is formed inside the mixing body 2, a heat-insulating cavity 111 is formed between the mixing body 2 and the heat-insulating outer shell 1, and a heat-insulating medium flows in the heat-insulating cavity 111; a plurality of air inlet holes 121 and an air outlet hole 122 are provided on the top of the mixing body 2, the air outlet hole 122 corresponds to one end of the mixing channel 20, and the plurality of air inlet holes 121 correspond to the other end of the mixing channel; the mixing channel 20 is a serpentine channel.

[0025] It should be noted that the multiple gases correspond to the multiple gas inlet holes 121 one by one, and the multiple gases are respectively introduced into the mixing channel 20 from the corresponding gas inlet holes 121. For example, five gas inlet holes 121 are provided, and the five gas inlet holes 121 are respectively connected to the gas supply pipes of rare earth chelate, silicon tetrachloride, germanium tetrachloride, oxygen, and helium, so that the multiple gases are mixed in the mixing channel 20.

[0026] It should be noted that the heat preservation medium is a heat medium, such as water, heat transfer oil and steam, and can also be other fluid materials, as long as it can continuously provide heat to the mixing channel 20 in the heat preservation chamber 111.

[0027] It should be noted that Figure 2 The direction indicated by the solid arrow in the figure is the flow direction of the multiple gases in the mixing channel 20. The mixing channel 20 can be a serpentine channel or a zigzag channel with multiple turning bends to change the flow direction of the mixed gas and increase the uniformity of the mixing.

[0028] The multi-channel gas mixing device that can realize heating and heat preservation provided in this embodiment is provided with a mixing channel 20 and a heat preservation chamber 111 arranged around the mixing channel 20, and the heat preservation chamber 111 contains a heat preservation medium. A plurality of raw material gases enter the mixing channel 20 from the corresponding air inlet holes 121. The mixing channel 20 is a serpentine channel, which can guide and restrict the flow direction of the gas. The plurality of gases will collide with the inner wall of the mixing channel 20 in the mixing channel 20 to change the direction, forming irregular vortices, so that the plurality of gases can be mixed more evenly; the air inlet holes 121 and the air outlet holes 122 are both opened at the top of the mixing channel 20, so that the inflow and outflow direction of the gas is perpendicular to the flow direction of the gas in the mixing channel 20, and at least two forced changes in direction will occur when the gas flows, further enhancing the irregularity of the gas flow and improving the mixing uniformity of the plurality of gases; the heat preservation medium provides heat, so that the gas in the mixing channel 20 is always in a high temperature environment, ensuring that the rare earth chelate is always in a gaseous state, and ensuring the mixing quality of the plurality of gases.

[0029] In some embodiments, see Figure 2 The opposite sides of the heat-insulating housing 1 are provided with a liquid outlet 112 and a liquid inlet 113, respectively, and the liquid inlet 113 and the liquid outlet 112 are respectively connected with the heat-insulating chamber 111. The heat-insulating medium is discharged from the liquid outlet 112, and a new heat-insulating medium is injected into the heat-insulating chamber 111 from the liquid inlet 113. The heat-insulating medium is continuously transported through the liquid outlet 112 and the liquid inlet 113, so that the heat-insulating medium in the heat-insulating chamber 111 is in a flowing state, ensuring that the temperature will not drop, and ensuring the heat-insulating effect of the heat-insulating chamber 111.

[0030] In specific implementation, the liquid outlet 112 and the liquid inlet 113 are respectively arranged on opposite sides of the insulation shell 1 and located at the upper part of the corresponding side. The liquid outlet 112 is arranged at the upper part of the side, which can make the insulation medium fill the insulation cavity 111 to the maximum extent, ensure the uniformity of heating of various parts of the mixing channel 20, ensure the uniformity of temperature distribution in the mixing channel 20, and thus ensure the mixing effect of multiple gases.

[0031] As another embodiment of the positions of the liquid outlet 112 and the liquid inlet 113, the liquid inlet 113 is arranged at the bottom of one side of the thermal insulation shell 1, and the liquid outlet 113 is arranged at the upper part of the other side of the thermal insulation shell 1, and there is a height difference between the liquid inlet 113 and the liquid outlet 112.

[0032] In some embodiments, see Figure 1 The heat-insulating shell 1 includes a container box 11 with an opening at the top and a cover plate 12 covering the top of the container box 11; the cover plate 12 and the container box 11 are sealed and connected by fasteners 13; a mixing body 2 is arranged inside the container box 11, and the cover plate 12 cooperates with the mixing body 2 to form a sealed mixing channel 20. The cover plate 12, the container box 11 and the mixing body 2 are enclosed to form a heat-insulating chamber 111, and a plurality of air inlet holes 121 and an air outlet hole 122 are arranged on the cover plate 12. The cover plate 12 can block the opening of the heat-insulating shell 1 above the container box 11, so that the heat-insulating chamber 111 forms a sealed space. The arrangement of the cover plate 12 and the container box 11 allows the staff to quickly detect the internal situation of the container box 11, which is convenient for the staff to carry out maintenance.

[0033] In specific implementation, the fastener 13 is a bolt with a nut, a penetrating fixing hole is set on the cover plate 12, a fixing groove is set at the top of the containing box 11 corresponding to the fixing hole, and an internal thread is set in the fixing groove. When the cover plate 12 and the containing box 11 are matched up and down, the fixing groove is connected with the fixing hole, the bolt passes through the fixing hole and is screwed with the fixing groove, so that the cover plate 12 is firmly fixed on the containing box 11.

[0034] In some embodiments, see Figure 1 The mixing body 2 includes a plurality of baffles connected end to end, the plate surface of the baffle is perpendicular to the up and down direction, the bottom of the baffle is sealed and connected to the containing box 11, and the top surface of the baffle is tightly abutted against the lower surface of the cover plate 12; a plurality of baffles, the bottom surface of the containing box 11 and the cover plate 12 enclose a mixing channel, and the cover plate 12 is provided with an air inlet 121 and an air outlet 122. The top surface of the baffle is at the same height as the upper surface of the containing box 11. When the cover plate 12 covers the containing box 11, the lower surface of the cover plate 12 abuts against the baffle and the containing box 11 at the same time, and blocks the mixing channel 20 and the heat preservation chamber 111 into a closed state, so as to avoid leakage of multiple gases from the gap between the cover plate 12 and the containing box 11, and prevent the mixing channel 20 from being connected to the heat preservation chamber 111, causing the heat preservation medium to flow into the mixing channel 20, or the mixed gas to enter the heat preservation medium, causing production problems.

[0035] During specific implementation, a plurality of baffles are connected end to end to enclose a mixing space with an opening at the top. The mixing space is a serpentine space, and the gas will only flow in the mixing space and will not enter the heat preservation chamber 111.

[0036] In some embodiments, the cover plate 12 and the container 11 are both made of stainless steel. Stainless steel has high corrosion resistance, high thermal conductivity, high structural strength, and is not affected by input gas. Stainless steel has a long service life, and the manufactured device is wear-resistant, which reduces maintenance costs.

[0037] Optionally, the material of the cover plate 12 and the containing box 11 may also be polytetrafluoroethylene, as long as it has the characteristics of high temperature resistance, high strength and corrosion resistance, which will not be listed here one by one.

[0038] In specific implementation, the baffle is also made of stainless steel. The baffle can also be made of Hastelloy, which has the characteristics of corrosion resistance and high thermal conductivity, and meets the use requirements of separating the mixing chamber 20 and the insulation chamber 111. Any metal plate with corrosion resistance and high thermal conductivity can be used, and they are not listed here one by one.

[0039] In some embodiments, see Figure 2 The mixing channel 20 includes a plurality of first channels 201 arranged at intervals, and second channels 202 connected at both ends to the same side of two adjacent first channels 201, and the first channels 201 and the second channels 202 are arranged at an angle to form a tortuous mixing channel 20. This embodiment provides a curved shape of the mixing channel 20, the first channels 201 and the second channels 202 are perpendicular to each other, when the mixed gas flows from the first channel 201 to the second channel 202, the mixed gas will change direction due to resistance, forming irregular vortices, which is a better mixing of multiple gases and ensures the quality of gas mixing.

[0040] The two ends of the first channel 201 are defined as the first end and the second end. The three first channels 201 are arranged at intervals. The two ends of a second channel 202 are respectively connected to the first end of the first first channel 201 and the first end of the second first channel 201, and the two ends of another second channel 202 are respectively connected to the second end of the second first channel and the second end of the third first channel. The plurality of second channels 202 are parallel to each other. By sequentially connecting the plurality of first channels 201 and the plurality of second channels 202, the mixed flow path of the multiple gases becomes a serpentine path, thereby increasing the mixing efficiency of the multiple gases during the flow process.

[0041] In some embodiments, see Figure 2The mixing body 2 includes a first plate 21 and a second plate 22 spaced apart along a first horizontal direction, and a third plate 23 and a fourth plate 24 spaced apart along a second horizontal direction, the first horizontal direction and the second horizontal direction are perpendicular to each other; a first channel 201 is formed between the first plate 21 and the second plate 22, and a second channel 202 is formed between the third plate 23 and the fourth plate 24; the spacing between the first plate 21 and the second plate 22 is greater than the spacing between the third plate 23 and the fourth plate 24. In this embodiment, the width of the first channel 201 is greater than the width of the second channel 202, and the channel of the mixed gas will increase and decrease periodically during the flow process. The flow velocity of the mixed gas in the first channel 201 is small, and the flow velocity in the second channel 202 is large. The flow velocity of the mixed gas changes continuously during the flow process, which improves the non-uniformity of the gas during the flow process, thereby achieving a better mixing effect of multiple gases.

[0042] Among them, reference Figure 2 In two adjacent first channels 201, the two second plates 22 are close to each other and located on the inner side, the two first plates 21 are far away from each other and located on the outer side, the two ends of the third plate 23 are respectively connected to the two second plates 22, and the two ends of the fourth plate 24 are respectively connected to the two first plates 21.

[0043] This embodiment provides a specific structure of the mixing body 2. During the specific implementation process, the length of the third plate 23 is smaller than the length of the fourth plate 24, the length of the third plate 23 is equal to the relative distance between the two second plates 22, and the length of the fourth plate 24 is equal to the relative distance between the two first plates 22; the first plate 21 and the second plate 22 are staggered in the second horizontal direction, and the staggered distance is equal to the relative distance between the third plate 23 and the fourth plate 24.

[0044] It should be noted that the baffles located at both ends of the mixing body 2 are directly connected to the corresponding fourth plate 24 or third plate 23 to avoid gaps. The first plate 21, the second plate 22, the third plate 23 and the fourth plate 24 are integrally cast to avoid the generation of gaps, thereby improving the sealing effect of the mixing body 2.

[0045] In some embodiments, see Figure 2 A plurality of spoilers 25 are provided on the inner wall of the mixing channel 20. There is an angle between the spoiler 25 and the flow path of the gas, and the mixed gas is accelerated or decelerated at the angle, so that the mixed gas is dispersed as a whole, increasing the irregularity of the gas flow. The more the gas is dispersed, the higher the degree of mixing of the multiple gases is, and the mixing quality of the gas is improved.

[0046] For specific implementation, see Figure 2Spoilers 25 are provided on both sides of the mixing channel 20. The spoiler 25 on one side is inclined along the flow direction of the gas, and the spoiler 25 on the other side is inclined along the flow direction away from the gas, so that the mixed gas is accelerated on one side and decelerated on the other side when flowing through the spoiler 25, and the gas is dispersed.

[0047] Preferably, the surfaces of the spoilers 25 on both sides of the mixing channel 20 are parallel to each other. For example, the spoilers between the first plate 21 and the second plate 22 are divided into two types, and the surface of the spoiler 25 arranged on the first plate 21 is parallel to the surface of the spoiler arranged on the second plate 22, and the mixed gas will cause uneven flow rate when passing through, thereby increasing the irregularity of gas flow.

[0048] In some embodiments, see Figure 1 The air outlet 122 and the plurality of air inlet holes 121 are respectively connected to the air pipe 14. The air pipe 14 facilitates the air outlet 122 and the air inlet hole 121 to be respectively connected to the corresponding transport pipe, thereby reducing the difficulty of installation. A sealing pad or a sealing sleeve can be added to the connection between the pipes to improve the sealing performance and prevent gas leakage during transportation, thereby affecting the working environment.

[0049] In some embodiments, a sealing gasket is provided between the cover plate 12 and the top opening of the containing box 11. The sealing gasket can be squeezed to increase the sealing between the cover plate 12 and the containing box 11.

[0050] In a specific implementation, an upper groove is provided on the cover plate 12, and a lower groove is correspondingly provided on the top surface of the containing box 11. The lower groove is connected to the fixing groove, and the lower groove is connected to the fixing hole. The sealing gasket is accommodated in the space formed by the upper groove and the lower groove and is squeezed, thereby increasing the sealing performance of the cover plate 12 and the containing box 11.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-channel gas mixing device capable of achieving heating and heat preservation, characterized in that: It includes a heat-insulating outer shell and a mixing body arranged inside the heat-insulating outer shell, a mixing channel is formed inside the mixing body, a heat-insulating cavity is formed between the mixing body and the heat-insulating outer shell, and a heat-insulating medium flows in the heat-insulating cavity; a plurality of air inlets and an air outlet are opened on the top of the mixing body, the air outlet holes are connected to one end of the mixing channel correspondingly, and a plurality of air inlets are connected to the other end of the mixing channel correspondingly; the mixing channel is a serpentine channel.

2. The multi-channel gas mixing device capable of achieving heating and heat preservation as claimed in claim 1, characterized in that: A liquid outlet and a liquid inlet are respectively provided on opposite sides of the heat-insulating shell, and the liquid inlet and the liquid outlet are respectively communicated with the heat-insulating cavity.

3. The multi-channel gas mixing device capable of achieving heating and heat preservation as claimed in claim 1, characterized in that: The heat-insulating outer shell includes a containing box with an opening at the top and a cover plate arranged on the top of the containing box; the cover plate and the containing box are sealed and connected by fasteners; the mixing body is arranged inside the containing box, the cover plate cooperates with the mixing body to form the sealed mixing channel, the cover plate, the containing box and the mixing body are enclosed to form the heat-insulating cavity, and the cover plate is provided with a plurality of the air inlet holes and the air outlet holes.

4. The multi-channel gas mixing device capable of achieving heating and heat preservation as claimed in claim 3, characterized in that: The mixing body includes a plurality of baffles connected end to end, the plate surface of the baffle is perpendicular to the up and down direction, the bottom of the baffle is sealed with the containing box, and the top surface of the baffle is tightly abutted with the lower surface of the cover plate; the plurality of baffles, the bottom surface of the containing box and the cover plate enclose the mixing channel, and the cover plate is provided with the air inlet and the air outlet.

5. The multi-channel gas mixing device capable of achieving heating and heat preservation as claimed in claim 3, characterized in that: The cover plate and the containing box are both made of stainless steel.

6. The multi-channel gas mixing device capable of achieving heating and heat preservation as claimed in claim 1, characterized in that: The mixing channel includes a plurality of first channels arranged at intervals, and a second channel whose two ends are connected to the same side of two adjacent first channels, and the first channel and the second channel are arranged at an angle to form the tortuous mixing channel.

7. The multi-channel gas mixing device capable of achieving heating and heat preservation as claimed in claim 6, characterized in that: The mixing body comprises a first plate and a second plate spaced apart in a first horizontal direction, and a third plate and a fourth plate spaced apart in a second horizontal direction, wherein the first horizontal direction and the second horizontal direction are perpendicular to each other; the first channel is formed between the first plate and the second plate, and the second channel is formed between the third plate and the fourth plate; A distance between the first plate and the second plate is greater than a distance between the third plate and the fourth plate.

8. The multi-channel gas mixing device capable of achieving heating and heat preservation as claimed in claim 1, characterized in that: A plurality of spoilers are arranged on the inner wall of the mixing channel.

9. The multi-channel gas mixing device capable of achieving heating and heat preservation as claimed in claim 1, characterized in that: The air outlet and the plurality of air inlet holes are respectively connected to air pipes.

10. The multi-channel gas mixing device capable of achieving heating and heat preservation as claimed in claim 3, characterized in that: A sealing gasket is provided between the cover plate and the top opening of the containing box.

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