Cooling tube

Abstract

To improve cooling efficiency with a cooling gas on a cooling tube that introduces the cooling gas into a tube from an introduction port on one end side and discharges a heated gas, of which heat is exchanged inside the tube and which is heated, from a discharge port on the other end side.SOLUTION: A cooling tube for introducing a cooling gas Ac into a tube 10 from an introduction port 12 on one end side and discharging a heated gas Ah, of which heat is exchanged inside the tube and which is heated, from a discharge port 13 on the other end side is provided with insertion members 21, 22 having linear shapes inside linear tube parts 11a, 11b having linear shapes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cooling tube in which a cooling gas is introduced into the tube through an inlet at one end, and the heated gas is discharged from an outlet at the other end after heat exchange within the tube. In particular, the present invention is characterized in that the flow rate of the cooling gas flowing within the tube is increased, thereby improving the cooling efficiency of the tube. [Background technology]

[0002] Conventionally, in order to lower the temperature of the atmosphere inside a furnace, a cooling tube has been used in which a cooling gas is introduced into the tube from an inlet at one end, and the heated gas that is heated by heat exchange inside the tube is discharged from an outlet at the other end.

[0003] Known examples of such cooling tubes include those that use straight tubes, and those that, as shown in Patent Document 1, use a U-shaped cooling tube in a glass heat treatment furnace, in order to cool the inside of the furnace, by introducing cooling gas into the tube from an inlet at one end of the tube and leading it into the furnace, causing the cooling gas introduced into the tube to absorb heat in the furnace and perform heat exchange, and then discharging the heated gas that has been heat exchanged through heat exchange from an outlet at the other end.

[0004] Here, in order to quickly reduce the temperature inside the furnace and perform cooling using the cooling tube as described above, it is possible to increase the flow rate of the cooling gas introduced into the tube from the inlet on one end side of the cooling tube.

[0005] However, in order to increase the flow rate of the cooling gas introduced into the tube from the inlet at one end of the cooling tube in this way, a large blower is required, which poses the problem of high equipment and running costs. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2022-80771 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0007] The present invention aims to solve the above-mentioned problems that arise when a cooling tube is used to quickly lower the temperature inside a furnace for cooling, in a cooling tube in which cooling gas is introduced into the tube from an inlet on one end and the heated gas that is heated by heat exchange inside the tube is discharged from an outlet on the other end.

[0008] In other words, the present invention aims to increase the cooling efficiency of the tube so that the temperature inside the furnace can be quickly reduced and cooled efficiently in a cooling tube such as that described above, without having to increase the flow rate of cooling gas introduced into the tube using a large fan, as was done in the past. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the cooling tube according to the present invention introduces cooling gas into the tube from an inlet at one end and discharges the heated gas that has been heated by heat exchange within the tube from an outlet at the other end, and a linear insertion member is provided inside the linear tube portion.

[0010] When a straight insert member is provided inside a straight tube section, as in the cooling tube of the present invention, the gas flow path in the straight tube section with the insert member narrows, the flow rate of the cooling gas flowing through this section increases, and the cooling gas flows close to the circumferential surface of the tube where heat exchange occurs, cooling the straight tube section.Furthermore, the heat in the straight tube section is also transferred to the insert member, where it is cooled by the cooling gas, thereby increasing the cooling efficiency of the entire tube.

[0011] In addition, in the cooling tube of the present invention, the straight tube sections can be provided on the inlet side for introducing cooling gas and the outlet side for discharging heated gas after heat exchange, and the straight insert member can be provided inside at least one of the straight tube sections on the inlet side or the outlet side. In this way, the flow rate of the cooling gas increases in the straight tube sections on the inlet side and the outlet side where the straight insert member is provided, and the cooling gas flows near the circumferential surface of the tube where heat exchange occurs, cooling the straight tube sections. Furthermore, the heat in the straight tube sections is transferred to the insert member and cooled by the cooling gas, thereby improving the cooling efficiency of the entire tube.

[0012] In addition, in the cooling tube of the present invention, a holding member can be provided around the outer periphery of the insert member to hold the insert member inside the straight tube section. In this way, the insert member is stably held inside the straight tube section without rattling, and heat from the circumferential surface of the tube is transferred to the insert member through the holding member and cooled by the cooling gas.

[0013] In the cooling tube of the present invention, the retaining member can be a spiral retaining member attached to the outer periphery of the insert member. In this way, the insert member is stably held without rattle inside the straight tube section, and heat from the circumferential surface of the tube is transferred to the insert member through this retaining member and cooled by the cooling gas. Furthermore, the cooling gas flows along the spiral retaining member attached to the outer periphery of the insert member, lengthening the flow path of the gas flowing near the circumferential surface of the tube, further improving the cooling efficiency of the tube.

[0014] In addition, in the cooling tube of the present invention, the insert member may be an insert member whose portion on the cooling gas inlet side widens in a tapered shape from the tip. In this way, the cooling gas passes through the portion on the insert member on the inlet side that widens in a tapered shape from the tip and is quickly guided between the outer periphery of the insert member and the circumferential surface of the tube, further improving the cooling efficiency of the tube.

[0015] Furthermore, in the cooling tube of the present invention, a hollow insert member can be used as the insert member. When a hollow insert member is used, the temperature of the insert member rises more quickly than with a solid insert member, allowing for a quick cooling process, and the weight is lighter, making it easier to handle. [Effects of the Invention]

[0016] In the present invention, in a cooling tube in which cooling gas is introduced into the tube through an inlet at one end and the heated gas that has been heated by heat exchange within the tube is discharged from an outlet at the other end, a straight insert member is provided inside the straight tube section as described above, so that the gas flow path in the straight tube section where the insert member is provided narrows, increasing the flow rate of the cooling gas flowing through this section and allowing the cooling gas to flow close to the circumferential surface of the tube where heat exchange occurs, resulting in efficient heat exchange, and furthermore, the heat in the straight tube section is transferred to the insert member and cooled by the cooling gas, thereby improving the cooling efficiency of the entire tube.

[0017] As a result, in the cooling tube of the present invention, when the temperature inside the furnace is quickly lowered and cooled, it is possible to increase the cooling efficiency throughout the tube and efficiently and quickly lower the temperature inside the furnace without having to increase the flow rate of cooling gas introduced into the tube using a large fan, as was done in the past. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 10 is a schematic cross-sectional view illustrating a state in which a cooling tube according to an embodiment of the present invention is attached to a furnace for use, and illustrates an example in which an insert member having a cross-shaped retaining member on the outer periphery is provided inside a straight tube portion on the inlet side and a straight tube portion on the outlet side that are straight. [Figure 2] FIG. 10 is a schematic cross-sectional view illustrating a state in which an insert member provided with a cross-shaped holding member is provided inside a straight tube portion in the cooling tube according to the embodiment. [Figure 3] FIG. 10 is a schematic cross-sectional view showing a modified example of the cooling tube in the above embodiment, in which an insertion member having a spiral retaining member on the outer periphery is provided inside the straight tube portion on the inlet side and the straight tube portion on the outlet side, which are linear. [Figure 4]1A and 1B are schematic front views showing modified examples of the tube used in the cooling tube in the embodiment of the present invention, in which (A) is a straight tube, (B) is a roughly U-shaped tube, and (C) is a roughly W-shaped tube. BEST MODE FOR CARRYING OUT THE INVENTION

[0019] Hereinafter, a cooling tube according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Note that the cooling tube according to the present invention is not limited to the embodiment shown below, and can be appropriately modified and implemented within the scope of the invention.

[0020] In the cooling tube according to an embodiment of the present invention, as shown in FIG. 1, a U-shaped tube 10 is used, which has a folded portion 11c between two straight tube portions 11a and 11b on both sides, and the ends of the straight tube portions 11a and 11b on both sides are led from inside the furnace 1 through the furnace wall 1a to the outside of the furnace 1.

[0021] A cooling gas supply pipe 2 for supplying cooling gas Ac into the tube 10 is connected to an inlet 12 at the end of one straight tube portion 11a led out of the furnace 1, while an outlet 13 at the end of the opposite straight tube portion 11b led out of the furnace 1 is connected to an outlet 3 for discharging heated gas Ah that has been heat exchanged within the tube 10.

[0022] In the cooling tube according to this embodiment, as shown in FIGS. 1 and 2, linear insertion members 21, 22 are provided in the straight tube portions 11a, 11b on both sides, and retaining members 23, 24 are provided radially on the outer periphery of each insertion member 21, 22, so that each retaining member 23, 24 comes into contact with the inner periphery of each straight tube portion 11a, 11b, thereby retaining each insertion member 21, 22 inside each straight tube portion 11a, 11b.

[0023] However, to prevent displacement over time or to position the straight tube sections 11a, 11b upright, the insert members 21, 22 may be welded to the inside of the straight tube sections 11a, 11b. In this case, partial welding such as spot welding is sufficient instead of welding the entire circumference.

[0024] In addition, ring-shaped heat transfer fins 14 are provided at a required interval around the outer periphery of the straight tube sections 11a and 11b on both sides to allow the heat inside the furnace 1 to be transferred efficiently to the straight tube sections 11a and 11b.

[0025] Furthermore, in the cooling tube according to this embodiment, as shown in Fig. 2, hollow insert members 21, 22 are used. When hollow insert members 21, 22 are used, the temperature of the insert members 21, 22 increases more quickly due to the heat inside the furnace 1 than when solid insert members are used, allowing the insert members 21, 22 to enter the cooling process sooner, and the weight is lighter, making them easier to handle.

[0026] In addition, in the cooling tube of this embodiment, the insertion member 21 provided in the straight tube portion 11a on the inlet side through which the cooling gas Ac is introduced has a tapered section 21a that tapers from the tip at the portion where the cooling gas Ac is introduced, and the insertion member 22 provided in the straight tube portion 11b on the outlet side through which the heated gas Ah is discharged has a tapered section 22a that tapers from the tip where the cooling gas Ac is led from the straight tube portion 11a through the folded section 11c.

[0027] In the cooling tube of this embodiment, when cooling gas Ac is supplied into the tube 10 from the cooling gas supply pipe 2 through the inlet 12, the cooling gas Ac is smoothly guided between the outer periphery of the insertion member 21 and the straight tube portion 11a on the inlet side through the tapered portion 21a of the insertion member 21 provided inside the straight tube portion 11a on the inlet side.

[0028] When the cooling gas Ac is introduced between the outer periphery of the insert member 21 and the inner periphery of the inlet-side straight tube portion 11a in this way, it directly cools the insert member 21 and the inlet-side straight tube portion 11a. The flow path through which the cooling gas Ac flows narrows, increasing the flow rate of the cooling gas Ac and causing the cooling gas Ac to flow near the circumferential surface of the inlet-side straight tube portion 11a where heat exchange occurs, thereby improving the cooling efficiency of the inlet-side straight tube portion 11a.

[0029] Furthermore, in the straight tube portion 11a on the inlet side, the heat received from inside the furnace 1 is transferred to the holding member 23 and then to the insert member 21, and is also cooled by the insert member 21 which is cooled by the cooling gas Ac.

[0030] Furthermore, the cooling gas Ac after heat exchange through the straight tube portion 11a on the inlet side as described above is led to the turning portion 11c, and while cooling the turning portion 11c, is led through the turning portion 11c to the straight tube portion 11b on the discharge side opposite to the straight tube portion 11a.

[0031] When the cooling gas Ac is introduced into the straight tube portion 11b on the discharge side, the cooling gas Ac is smoothly introduced between the outer periphery of the insertion member 22 and the straight tube portion 11b through the tapered portion 22a of the insertion member 22 provided inside this straight tube portion 11b.

[0032] When the cooling gas Ac is introduced between the outer periphery of the insert 22 and the inner periphery of the discharge-side straight tube section 11b in this manner, it directly cools the insert 22 and the inlet-side straight tube section 11b, just as in the case of the inlet-side straight tube section 11a. The flow path through which the cooling gas Ac flows narrows, increasing the flow rate of the cooling gas Ac and causing the cooling gas Ac to flow near the circumferential surface of the straight tube section 11b where heat exchange occurs, thereby improving the cooling efficiency of the discharge-side straight tube section 11b.

[0033] Furthermore, in the straight tube portion 11b on the discharge side, the heat received from inside the furnace 1 is transferred to the holding member 24 and then to the insert member 22, and is also cooled by the insert member 22 which is cooled by the cooling gas Ac.

[0034] The heated gas Ah thus heated by heat exchange through the straight tube portion 11b on the discharge side is guided to the discharge pipe 3 through the discharge port 13 in the tube 10 and is discharged through the discharge pipe 3.

[0035] In the cooling tube of this embodiment, the straight tube segments 11a and 11b are provided with straight insert members 21 and 22, respectively, and the retaining members 23 and 24 are provided radially around the outer periphery of each insert member 21 and 22. The retaining members 23 and 24 are in contact with the inner periphery of each straight tube segment 11a and 11b, respectively, to retain each insert member 21 and 22 inside each straight tube segment 11a and 11b. This directly cools the insert members 21 and 22 and the inlet-side straight tube segments 11a and 11b. The flow velocity of the cooling gas Ac flowing through each straight tube segment 11a and 11b is increased, and the cooling gas Ac flows near the circumferential surfaces of the straight tube segments 11a and 11b with which it exchanges heat, thereby improving the cooling efficiency of each straight tube segment 11a and 11b.

[0036] Furthermore, in each straight tube section 11a, 11b, the heat received from inside the furnace 1 is transferred to each insert member 21, 22 through the holding members 23, 24, respectively, and is then cooled by these insert members 21, 22, which are also cooled by the cooling gas Ac.

[0037] As a result, in the cooling tube of this embodiment, it is possible to increase the cooling efficiency of the entire tube 10 and efficiently and quickly reduce the temperature inside the furnace 1, without having to increase the flow rate of the cooling gas Ac introduced into the tube 10 using a large fan, as in the conventional case.

[0038] Furthermore, in the cooling tube of this embodiment, when linear insertion members 21, 22 are provided within the straight tube portions 11a, 11b on both sides, retaining members 23, 24 are provided radially on the outer periphery of each insertion member 21, 22, but the shape of the retaining members 23, 24 provided on the outer periphery of each insertion member 21, 22 is not limited to this.

[0039] For example, as shown in FIG. 3, when linear insert members 21, 22 are provided in the straight tube portions 11a, 11b on both sides, spiral retaining members 25, 26 can be provided on the outer periphery of each insert member 21, 22.

[0040] As shown in FIG. 3, if spiral retaining members 25, 26 are attached to the outer periphery of each insert 21, 22, the inserts 21, 22 are stably held inside the straight tube sections 11 a, 11 b without rattle, as in the case described above. Furthermore, the heat received from the furnace 1 in each straight tube section 11 a, 11 b is transferred to the inserts 21, 22 through the retaining members 23, 24, respectively, and is then transferred to the inserts 21, 22, where it is cooled by the cooling gas Ac. Furthermore, the cooling gas Ac flows along the spiral retaining members 25, 26 attached to the outer periphery of each insert 21, 22, and the flow path of the cooling gas Ac near the circumferential surface of each straight tube section 11 a, 11 b is lengthened, thereby allowing the straight tube sections 11 a, 11 b to be cooled more efficiently by the cooling gas Ac.

[0041] Furthermore, in this embodiment, a U-shaped tube 10 is used as the cooling tube, but it is not limited to this shape as long as it has a linear tube portion.

[0042] For example, a straight tube 10A as shown in FIG. 4(A), a roughly U-shaped tube 10B as shown in FIG. 4(B), or a roughly W-shaped tube 10C as shown in FIG. 4(C) can be used. [Explanation of symbols]

[0043] 1: Furnace 1a: Furnace wall 2: Cooling gas supply pipe 3: Discharge pipe 10: Tube 10A: Tube 10B: Tube 10C: Tube 11a: Straight tube section 11b: Straight tube section 11c: Folded section 12: Entrance 13: Outlet 14: Heat transfer fin 21: Insertion member 21a: Tapered section 22: Insertion member 22a: Tapered section 23: Holding member 24: Holding member 25: Holding member 26: Holding member Ac: Cooling gas Ah: heated gas

Claims

1. This cooling tube introduces cooling gas into the tube from an inlet on one end side, and discharges the heated gas that has been heated by heat exchange within the tube from an outlet on the other end side, and is characterized in that a linear insertion member is provided inside the linear tube portion.

2. 2. The cooling tube according to claim 1, wherein the straight tube portion is provided on an inlet side for introducing a cooling gas and an outlet side for discharging the heated gas that has been heated by heat exchange, and the straight tube insertion member is provided inside at least one of the straight tube portion on the inlet side and the straight tube portion on the outlet side.

3. 3. The cooling tube according to claim 1, wherein a holding member is provided on the outer periphery of said insertion member for holding said insertion member inside said straight tube portion.

4. 4. The cooling tube according to claim 3, wherein the holding member is a spiral holding member provided on the outer periphery of the insertion member.

5. 3. The cooling tube according to claim 1, wherein the gas introduction side portion of the insertion member is tapered and widens from the tip.

6. 3. The cooling tube according to claim 1, wherein the insert member is hollow.

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