Cooling pipe, cooling device and continuous firing furnace

Abstract

The utility model relates to a cooling pipe, a cooling device and a continuous firing furnace. A U-shaped cooling tube (2) is provided with two linear seamless tubes (21) and a curved seamless tube (22) connected to one end of the two linear seamless tubes (21), and is further provided with fins (23) provided in a spiral shape on the side surfaces of the linear seamless tubes (21). According to the cooling pipe, due to the fact that the fins are arranged on the side face of the linear seamless pipe in the spiral shape, the heat transfer area can be increased, and the cooling efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to a cooling pipe, in particular to a cooling pipe suitable for a cooling device used in a continuous firing furnace. Background Art

[0002] In the past, for example, as a cooling device for a continuous firing furnace, there has been known a device that cools the internal space of the cooling device and the object to be processed accommodated in the internal space by causing a cooling medium to flow inside a cooling pipe. In such a conventional cooling pipe, there are problems of a small surface area and low cooling efficiency. Summary of the Utility Model

[0003] Technical Problem to be Solved by the Utility Model

[0004] Therefore, an object of the present utility model is to provide a cooling pipe with high cooling efficiency and a cooling device including the same.

[0005] Technical Solution for Solving the Technical Problem

[0006] To solve the above technical problem, a first aspect of the present utility model is a U-shaped cooling pipe (2), which is characterized by comprising: two straight seamless pipes (21), and a bent seamless pipe (22) connected to one end of the two straight seamless pipes (21).

[0007] The cooling pipe (2) further includes fins (23) arranged in a spiral shape on the side surface of the straight seamless pipe (21).

[0008] In addition, a second aspect of the present utility model is based on the cooling pipe (2) of the first aspect, and is characterized in that

[0009] The ratio S2 / S1 of the heat transfer area S2 of the fin (23) to the heat transfer area S1 of the straight seamless pipe (21) is 2 or more.

[0010] In addition, a third aspect of the present utility model is based on the cooling pipe (2) of the first aspect, and is characterized in that

[0011] The straight seamless pipe (21) and the fin (23) are connected via a welding nugget portion (24).

[0012] In addition, a fourth aspect of the utility model is based on the cooling pipe (2) of the third aspect, and is characterized in that

[0013] The fin (23) is connected to the straight seamless pipe (21) only via the welding nugget portion (24) from one side (23a) thereof.

[0014] In addition, the fifth solution of the present utility model is based on the cooling pipe (2) of the fourth solution, and is characterized in that

[0015] The wall thickness (T1) of the above-mentioned straight seamless pipe (21) is 1.65 mm or more and 3.6 mm or less,

[0016] The wall thickness (T2) of the above-mentioned fin (23) is 0.5 mm or more and 1.5 mm or less,

[0017] The penetration depth (P1) of the above-mentioned welding nugget part (24) in the above-mentioned straight seamless pipe (21) and the penetration depth (P2) of the above-mentioned welding nugget part (24) in the above-mentioned fin (23) are respectively 0.1 mm or more and 0.3 mm or less.

[0018] In addition, the sixth solution of the present utility model is a cooling device (1), which is characterized in that it includes the cooling pipe (2) of any one of the first solution to the fifth solution.

[0019] In addition, the seventh solution of the present utility model is based on the cooling device (1) of the sixth solution,

[0020] The straight seamless pipe (21) of the above-mentioned cooling pipe (2) is arranged in a way that it penetrates through the two side walls (1a) of the cooling device,

[0021] The cooling device (1) includes: main supply pipes (51, 61) for supplying a cooling medium; a plurality of branch supply pipes (52, 62) branched from the main supply pipes (51, 61) and respectively connected to a plurality of the above-mentioned cooling pipes (2);

[0022] main discharge pipes (54, 64) for discharging the cooling medium; and a plurality of branch discharge pipes (53, 63) branched from the main discharge pipes (54, 64) and respectively connected to a plurality of the above-mentioned cooling pipes (2).

[0023] In addition, the eighth solution of the present utility model is based on the cooling device (1) of the seventh solution,

[0024] When the number of straight seamless pipes (21) arranged between the above-mentioned branch supply pipes (52, 62) and branch discharge pipes (53, 63) in a group is set to n, and the number of curved seamless pipes (22, 22a, 22b) is set to n - 1, n is 3 or more.

[0025] In addition, the ninth solution of the present utility model is a continuous firing furnace, which is characterized in that it includes the cooling device (1) of any one of the sixth solution to the eighth solution.

[0026] Effects of the utility model

[0027] According to the cooling pipe of the present utility model, since it has fins arranged in a spiral shape on the side of a straight seamless pipe, the heat transfer area can be increased and the cooling efficiency can be improved. In addition, the cooling pipe of the present utility model has a U shape, and includes two straight seamless pipes and a bent seamless pipe connected to one end of the two straight seamless pipes. The bent seamless pipe is only arranged at one end of the straight seamless pipe and not at the other end. Therefore, the other end of the straight seamless pipe that becomes an open end can be inserted into the cooling device for installation. Thus, the installation of the cooling pipe into the cooling device is easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. is a schematic side view of a cooling device according to an embodiment of the present utility model.

[0029] Figure 2 FIG. is a top view of the cooling pipe of the cooling device.

[0030] Figure 3 FIG. is a cross-sectional view near the fin of the cooling pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Hereinafter, regarding the cooling pipe according to an embodiment of the present utility model and the cooling device including the cooling pipe, an example in which they are provided in a continuous firing furnace such as a roller hearth kiln will be described. The cooling device 1 is provided on the downstream side in the conveying direction of the continuous firing furnace, and cools the object to be processed after being fired in the continuous firing furnace while conveying the object to be processed by a conveying roller 7 provided inside the cooling device 1.

[0032] As Figure 2 shown, the cooling pipe 2 provided in the cooling device 1 has a U shape, and includes two straight seamless pipes 21 and a bent seamless pipe 22 connected to one end of the two straight seamless pipes 21. In addition, fins 23 are arranged in a spiral shape on the side of the straight seamless pipe 21. The straight seamless pipe 21, the bent seamless pipe 22, and the fins 23 can be made of known materials, for example, SUS304 or the like can be used.

[0033] From the viewpoint of cooling efficiency, the ratio S2 / S1 of the heat transfer area S2 of the fins 23 to the heat transfer area S1 of the straight seamless pipe 21 is preferably 2 or more.

[0034] In addition, as Figure 3 shown, the straight seamless pipe 21 and the fins 23 are connected via a welding nugget portion 24. More specifically, the fins 23 are connected to the straight seamless pipe 21 via the welding nugget portion 24 only from one side 23a thereof (the left side of the fins 23 in Figure 3 ).

[0035] From the viewpoint of the strength of the straight seamless tube 21 and the fins 23, the wall thickness T of the straight seamless tube 21 is preferably 11.65 mm or more and 3.6 mm or less, the wall thickness T2 of the fins 23 is preferably 0.5 mm or more and 1.5 mm or less, and the penetration depth P1 of the welding nugget portion 24 at the straight seamless tube 21 and the penetration depth P2 of the welding nugget portion 24 at the fins 23 are both preferably 0.1 mm or more and 0.3 mm or less.

[0036] The cooling tube 2 is provided in such a manner that the straight seamless tube 21 penetrates the side walls 1a on both sides of the cooling device 1, and includes: main supply pipes 51 and 61 for supplying a cooling medium; a plurality of branch supply pipes 52 and 62 that branch from the main supply pipes 51 and 61 and are respectively connected to the plurality of cooling tubes 2; main discharge pipes 54 and 64 for discharging the cooling medium; and a plurality of branch discharge pipes 53 and 63 that branch from the main discharge pipes 54 and 64 and are respectively connected to the plurality of cooling tubes 2. It should be noted that as the cooling medium, a known cooling medium such as water can be used.

[0037] It should be noted that in Figure 1 a state is shown in which one end of the straight seamless tube 21 is disposed on the inner side of the paper surface and the other end of the straight seamless tube 21 is disposed on the front side of the paper surface. The other ends of adjacent straight seamless tubes 21 are connected by a known flexible tube 24. In the present embodiment, an example in which four cooling tubes 2 are connected by three flexible tubes 25 is shown. It should be noted that as Figure 1 shown, by disposing the cooling tube 2 on the cooling device 1 inclined with respect to the horizontal direction, the cooling efficiency is improved.

[0038] In addition, considering the cost performance of the cooling efficiency and cost, it is preferable that when the number of straight seamless tubes 21 disposed between a set of branch supply pipes 52 and 62 and branch discharge pipes 53 and 63 communicated via the cooling tube 2 is set to n, and the number of curved seamless tubes 22, 22a, and 22b is set to n - 1, n is 3 or more. In Figure 1 a case where n = 8 is shown.

[0039] According to the cooling tube 2 and the cooling device 1 including the cooling tube 2 of the present embodiment, since the fins 23 are provided in a spiral shape on the side surface of the straight seamless tube 21, the heat transfer area can be increased and the cooling efficiency can be improved. In addition, the cooling tube 2 of the present embodiment has a U shape and includes two straight seamless tubes 21 and a curved seamless tube 22 connected to one end of the two straight seamless tubes 21. The curved seamless tube 22 is provided only at one end of the straight seamless tube 21 and not at the other end, so that the other end of the straight seamless tube 21 that becomes an open end can be inserted into the cooling device 1, and thus it is easy to install the cooling tube on the cooling device.

[0040] Description of the reference numerals

[0041] 1 Cooling device

[0042] 1a Side wall of the cooling device

[0043] 2 Cooling pipe

[0044] 21 Straight seamless pipe

[0045] 22, 22a, 22b Bent seamless pipes

[0046] 23 Fins

[0047] 24 Weld nugget part

[0048] 24a One side of the fin

[0049] 51, 61 Main supply pipes

[0050] 52, 62 Branch supply pipes

[0051] 53, 63 Branch discharge pipes

[0052] 54, 64 Main discharge pipes

[0053] P1 Penetration depth of the weld nugget part at the straight seamless pipe

[0054] P2 Penetration depth of the weld nugget part at the fin

[0055] T1 Wall thickness of the straight seamless pipe

[0056] T2 Wall thickness of the said fin

Claims

1. A cooling tube (2) having a U-shape, characterized in that: The cooling pipe (2) comprises two straight seamless pipes (21) and a curved seamless pipe (22) connected to one end of the two straight seamless pipes (21). The cooling pipe (2) further includes fins (23) which are spirally arranged on the side surface of the linear seamless pipe (21).

2. The cooling tube (2) according to claim 1, characterized in that: A ratio S2 / S1 of a heat transfer area S2 of the fin (23) to a heat transfer area S1 of the linear seamless pipe (21) is 2 or more.

3. The cooling tube (2) according to claim 1, characterized in that: The linear seamless pipe (21) and the fin (23) are connected via a welding nugget (24).

4. The cooling tube (2) according to claim 3, characterized in that: The fin (23) is connected to the linear seamless pipe (21) only from one side (23a) thereof via the welding nugget (24).

5. The cooling tube (2) according to claim 4, characterized in that: The wall thickness (T1) of the linear seamless pipe (21) is not less than 1.65 mm and not more than 3.6 mm. The wall thickness (T2) of the fin (23) is greater than or equal to 0.5 mm and less than or equal to 1.5 mm. The penetration depth (P1) of the weld nugget (24) at the linear seamless pipe (21) and the penetration depth (P2) of the weld nugget (24) at the fin (23) are respectively 0.1 mm or more and 0.3 mm or less.

6. A cooling device (1), characterized in that: A cooling pipe (2) according to any one of claims 1 to 5 is provided.

7. The cooling device (1) according to claim 6, characterized in that The straight seamless pipe (21) of the cooling pipe (2) is arranged to penetrate the two side walls (1a) of the cooling device. The cooling pipe (2) comprises: a main supply pipe (51, 61) for supplying a cooling medium; and a plurality of branch supply pipes (52, 62) branching from the main supply pipe (51, 61) and respectively connected to a plurality of cooling pipes (2); A main discharge pipe (54, 64) for discharging a cooling medium; and a plurality of branch discharge pipes (53, 63) branching from the main discharge pipe (54, 64) and respectively connected to a plurality of the cooling pipes (2).

8. The cooling device (1) according to claim 7, characterized in that When the number of straight seamless pipes (21) arranged between a set of branch supply pipes (52, 62) and branch discharge pipes (53, 63) is n and the number of curved seamless pipes (22, 22a, 22b) is n-1, n is greater than 3.

9. A continuous sintering furnace, characterized in that: A cooling device (1) according to any one of claims 6 to 8 is provided.

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