Radiant tube for drying furnace

Abstract

The utility model belongs to the technical field of radiant tubes, and provides a radiant tube for a drying furnace, which comprises a tube main body provided with a hot air inlet and a hot air outlet, a one-way valve mechanism close to the hot air outlet is arranged in an inner cavity of the tube main body, and hot air flowing from the hot air inlet to the hot air outlet is unidirectionally conducted by the one-way valve mechanism; the guide cover is arranged at the hot air outlet and comprises a pipe connecting part, a front connecting part and a cover body part which are connected in sequence, the pipe connecting part is connected with the pipe main body, the cover body part is in a spherical shell shape and is provided with an exhaust port with an opening facing downwards, and the exhaust port is communicated with the hot air outlet. According to the radiant tube for the drying furnace, backflow of hot air at the hot air outlet is eliminated, so that the phenomena that the local temperature of the radiant tube is too high and the radiant tube is burnt out and damaged due to the backflow of the hot air are avoided, meanwhile, the hot air is uniformly diffused in the drying furnace by reasonably guiding the hot air, the uniformity and stability of temperature rise are improved, and the service life of the radiant tube is prolonged. Heat loss is reduced, and the heat utilization rate is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of radiation tubes, in particular to a radiation tube for a drying furnace. Background Art

[0002] At present, the radiation heating drying furnaces on the market generally set the air outlet of the radiation tube outside the furnace to discharge the exhaust gas. The heat carried by the exhaust gas is directly discharged, resulting in heat loss, resulting in low heat utilization. The radiation tubes of some gas-fired drying furnaces directly set their air outlets inside the drying furnace. However, since the air outlets of existing radiation tubes are generally commonly used straight-through pipe openings, it is very easy for hot air to flow back into the tube at the air outlet position, causing turbulence near the air outlet position of the radiation tube, and even causing the temperature of the local body of the radiation tube to be too high and burnt and damaged; in addition, since the hot air is usually discharged directly along the straight-through pipe opening, the hot air has a low degree of diffusion and poor uniformity in the drying furnace, resulting in uneven temperature rise in the drying furnace and poor overall temperature balance in the furnace. At the same time, the hot air is discharged from the furnace without complete heat exchange, resulting in heat loss and waste.

[0003] Therefore, it is necessary to design a radiant tube for a drying furnace that can effectively solve the above problems. Summary of the invention

[0004] In order to solve the above technical problems, the utility model proposes a radiant tube for a drying furnace, which eliminates the backflow of hot air at the hot air outlet, thereby avoiding the phenomenon of excessive local temperature and burning damage of the radiant tube caused by the backflow of hot air. At the same time, by reasonably guiding the hot air, the hot air is evenly diffused in the drying furnace, the uniformity and stability of the temperature rise are improved, the heat loss is reduced, and the heat utilization rate is improved.

[0005] The technical solution of the utility model is:

[0006] The utility model provides a radiation tube for a drying furnace, comprising:

[0007] A pipe body, wherein the pipe body is provided with a hot gas inlet and a hot gas outlet, and a one-way valve mechanism is provided in the inner cavity of the pipe body near the hot gas outlet for unidirectionally guiding the hot gas flowing from the hot gas inlet to the hot gas outlet;

[0008] A guide hood is arranged at the hot air outlet, and includes a pipe connection part, a collar connection part, and a cover body part which are connected in sequence, the pipe connection part is connected to the pipe main body, the cover body part is in a spherical shell shape, and is provided with an exhaust port with an opening facing downward, and the exhaust port is communicated with the hot air outlet.

[0009] Preferably, the outer diameter of the collar connection portion is larger than the outer diameter of the pipe connection portion, and the maximum outer diameter of the cover body portion is smaller than the outer diameter of the collar connection portion.

[0010] Preferably, the highest position of the exhaust port along the radial direction of the pipe body is lower than the axial position of the pipe body.

[0011] Preferably, the guide cover further comprises blade bars arranged in the pipe joint portion, a plurality of blade bars are provided, and the blade bars are distributed at intervals along an axial direction perpendicular to the pipe body.

[0012] Preferably, the upper end surface and / or the lower end surface of the blade strip is an inclined surface inclined downward.

[0013] Preferably, the one-way valve mechanism comprises a shaft column connected to the inner wall of the pipe body, and a fan block movably connected to the shaft column;

[0014] The fan block is matched with the inner wall of the pipe body so as to seal the inner cavity of the pipe body in a closed state.

[0015] Preferably, the one-way valve mechanism further comprises a check spring sleeved on the shaft column, one end of the check spring is fixedly connected to the shaft column, and the other end of the check spring is fixedly connected to the fan block.

[0016] Preferably, there are two fan guards, and they are symmetrically distributed about the shaft column;

[0017] The anti-return springs are also provided with two, and one end of each of the anti-return springs is fixedly connected to the fan block, and the other end of each of the anti-return springs is fixedly connected to the shaft column.

[0018] Preferably, the guide cover is detachably sleeved on the outer periphery of the pipe body;

[0019] Alternatively, the guide cover and the tube body are of an integrated structure.

[0020] Compared with the prior art, the utility model has the following advantages and effects:

[0021] (1) A one-way valve mechanism is provided inside the tube body and near the hot gas outlet, which can effectively prevent the hot gas in the drying furnace from flowing back into the tube body through the hot gas outlet, thereby avoiding the turbulence in the radiation tube and the phenomenon of local high temperature burning the tube body, improving the stability and reliability of the radiation tube, promoting the heat exchange of hot gas in the drying furnace, and improving the heat utilization rate;

[0022] (2) A guide hood is installed at the hot air outlet of the tube body to guide the hot air discharged from the tube body in a reasonable and effective manner, so as to prevent the hot air from flowing only to a local area in the drying furnace, promote the uniform diffusion and heat exchange of the hot air in the drying furnace, thereby improving the heat utilization rate and the stability and uniformity of the temperature rise in the drying furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a schematic diagram of the structure of the radiation tube for the drying furnace in Example 1 of the utility model;

[0024] Figure 2 This is a schematic diagram of the explosion structure of the radiation tube for the drying furnace in Example 1 of the utility model;

[0025] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at position A in the middle;

[0026] Figure 4 This is a schematic structural diagram of a guide cover in a radiation tube for a drying furnace in Example 2 of the utility model.

[0027] Figure numerals: 1. pipe body; 12. hot air outlet; 2. one-way valve mechanism; 21. shaft column; 22. fan stop; 23. check spring; 3. guide cover; 31. pipe connection; 32. collar connection; 33. cover body; 331. exhaust port; 34. blade. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the present invention is now further described in conjunction with specific implementation methods.

[0029] Embodiment 1:

[0030] like Figure 1~Figure 3 As shown, the utility model provides a radiant tube for a drying furnace, comprising a tube body 1 and a detachable guide cover 3 sleeved on the end of the tube body 1. The tube body 1 is provided with a hot air inlet and a hot air outlet 12 respectively located at both ends, and the hot air inlet is connected to a burner for heating and raising the temperature of the drying furnace (not shown in the figure), so that the hot air carrying heat generated by the burner is introduced into the tube body 1 of the radiant tube through the hot air inlet, and finally discharged through the hot air outlet 12. It should be noted that the attached drawings only show a partial length of the radiant tube for the convenience of display and explanation, and the specific length and shape of the radiant tube can be set according to actual production and processing requirements.

[0031] refer to Figure 2 As shown, the inner cavity of the pipe body 1 is provided with a one-way valve mechanism 2 fixedly connected thereto, the one-way valve mechanism 2 is arranged close to the hot gas outlet 12, and it unilaterally guides the hot gas flowing from the hot gas inlet to the hot gas outlet 12, that is, the hot gas can only be discharged from the inside of the pipe body 1 through the one-way valve mechanism 2 and through the hot gas outlet 12, and will not flow into the inside of the pipe body 1 through the one-way valve mechanism 2 in the reverse direction through the hot gas outlet 12, thereby preventing the hot gas in the drying furnace from flowing back into the inside of the pipe body 1 to cause internal turbulence, and even causing the local temperature of the pipe body 1 to be too high and burnt and damaged.

[0032] like Figure 3As shown, the one-way valve mechanism 2 includes a shaft column 21 fixedly connected to the inner wall of the pipe body 1, and a fan block 22 movably connected to the shaft column 21. The fan block 22 is adapted to the inner wall of the pipe body 1 so that it can play a role in preventing backflow in a closed state. The one-way valve mechanism 2 also includes a non-return spring 23 sleeved on the shaft column 21. One end of the non-return spring 23 is fixedly connected to the shaft column 21, and the other end is fixedly connected to the fan block 22, so that the fan block 22 automatically returns to the inner cavity at the position of the hot gas outlet 12 under the action of the non-return spring 23. Figure 2 , Figure 3 As shown, two fan stops 22 are provided and are symmetrically distributed about the shaft column 21 , and two anti-return springs 23 are also provided, and one end of each of the anti-return springs is fixedly connected to the fan stops 22 , and the other end is fixedly connected to the shaft column 21 .

[0033] Combination Figure 1 , Figure 2 As shown, the guide cover 3 is arranged at the hot gas outlet 12 of the pipe body 1, and the guide cover 3 includes a pipe connection part 31, a collar connection part 32, and a cover body part 33 which are connected in sequence, and the pipe connection part 31, the collar connection part 32, and the cover body part 33 are all connected to the pipe body 1. The pipe connection part 31 is connected to the pipe body 1, and the cover body part 33 is in a spherical shell shape, and is provided with an exhaust port 331 arranged with an opening facing downward, and the highest position of the exhaust port 331 along the radial direction of the pipe body 1 is lower than the axial position of the pipe body 1, with reference to Figure 1 As shown, that is, the exhaust port 331 is located in the lower half of the spherical shell-shaped cover body 33, so that most of the hot air discharged from the hot air outlet 12 of the tube body 1 is guided and diffused downward through the arc-shaped inner wall of the cover body 33, rather than being directly discharged along the axial direction of the tube body 1, so that the hot air is evenly diffused to the surroundings, promoting heat exchange and improving heat utilization, while improving the uniformity and balance of temperature rise in the drying furnace.

[0034] like Figure 1 As shown, the outer diameter of the collar portion 32 is larger than the outer diameter of the pipe connection portion 31, and the maximum outer diameter of the cover body portion 33 is smaller than the outer diameter of the collar portion 32, so as to ensure that the bottom end of the collar portion 32 contacts the inner wall of the drying furnace first, so that there is a hot air flow diffusion gap between the exhaust port 331 of the cover body portion 33 and the inner wall of the drying furnace, avoiding the large obstruction of the inner wall of the drying furnace during the hot air discharge process.

[0035] Embodiment 2:

[0036] For Example 2 of the utility model, Figure 4 Note that description of parts that are not different from those in Embodiment 1 will be omitted and will be given the same reference numerals.

[0037] like Figure 4As shown, the utility model relates to a radiation tube for a drying furnace, wherein the guide cover 3 further includes blades 34 arranged inside the pipe connection portion 31 thereof, and a plurality of blades 34 are arranged and evenly spaced apart along an axial direction perpendicular to the tube body 1 .

[0038] The upper end surface and the lower end surface of the blade strip 34 are both inclined surfaces inclined downward. The blade strip 34 can perform primary guidance on the hot air discharged from the hot air outlet 12, and cooperate with the secondary guidance of the cover body 33 to increase the guiding effect of the hot air. At the same time, after the hot air passes through the blade strips 34 arranged at intervals, the flow speed of the hot air is increased, thereby promoting the diffusion effect and heat exchange effect of the hot air after being discharged through the exhaust port 331, thereby improving the heat utilization rate.

[0039] In summary, the radiant tube for a drying furnace provided by the utility model eliminates the backflow of hot air at the hot air outlet, thereby avoiding the phenomenon of excessive local temperature and burning damage of the radiant tube caused by the backflow of hot air. At the same time, by reasonably guiding the hot air, the hot air is evenly diffused in the drying furnace, thereby improving the uniformity and stability of the temperature rise, reducing heat loss and improving heat utilization.

[0040] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A radiant tube for a drying furnace, characterized in that: include: A pipe body (1), the pipe body (1) being provided with a hot gas inlet and a hot gas outlet (12), the inner cavity of the pipe body (1) being provided with a one-way valve mechanism (2) close to the hot gas outlet (12), the one-way valve mechanism (2) being used to guide the hot gas flowing from the hot gas inlet to the hot gas outlet (12); A guide cover (3), the guide cover (3) being arranged at the hot air outlet (12), comprising a pipe connection portion (31), a collar connection portion (32), and a cover body portion (33) which are connected in sequence, the pipe connection portion (31) being connected to the pipe main body (1), the cover body portion (33) being in the shape of a spherical shell, and being provided with an exhaust port (331) which is arranged with its opening facing downward, the exhaust port (331) being in communication with the hot air outlet (12).

2. The radiant tube for drying furnace according to claim 1, characterized in that: The outer diameter of the collar connection portion (32) is greater than the outer diameter of the pipe connection portion (31), and the maximum outer diameter of the cover body portion (33) is smaller than the outer diameter of the collar connection portion (32).

3. The radiant tube for drying furnace according to claim 1, characterized in that: The highest position of the exhaust port (331) along the radial direction of the pipe body (1) is lower than the axial position of the pipe body (1).

4. The radiant tube for a drying furnace according to claim 1, characterized in that: The guide cover (3) further comprises blade strips (34) arranged in the pipe connection portion (31), a plurality of blade strips (34) are provided, and the blade strips (34) are spaced apart and distributed along an axial direction perpendicular to the pipe body (1).

5. The radiant tube for a drying furnace according to claim 4, characterized in that: The upper end surface and / or the lower end surface of the blade strip (34) is an inclined surface inclined downward.

6. The radiant tube for a drying furnace according to claim 1, characterized in that: The one-way valve mechanism (2) comprises a shaft column (21) connected to the inner wall of the pipe body (1), and a fan stop (22) movably connected to the shaft column (21); The fan baffle (22) is adapted to the inner wall of the pipe body (1) so as to seal the inner cavity of the pipe body (1) in a closed state.

7. The radiant tube for a drying furnace according to claim 6, characterized in that: The one-way valve mechanism (2) further comprises a check spring (23) sleeved on the shaft column (21); one end of the check spring (23) is fixedly connected to the shaft column (21), and the other end is fixedly connected to the fan block (22).

8. The radiant tube for a drying furnace according to claim 7, characterized in that: Two fan stops (22) are provided, and are symmetrically distributed about the shaft column (21); Two anti-return springs (23) are also provided, and one end of each of the anti-return springs is fixedly connected to the fan block (22), and the other end of each of the anti-return springs is fixedly connected to the shaft column (21).

9. The radiant tube for a drying furnace according to claim 1, characterized in that: The guide cover (3) is detachably sleeved on the outer circumference of the pipe body (1); Alternatively, the guide cover (3) and the pipe body (1) are of an integrated structure.

Images