JPH0517388U - Heat exchanger - Google Patents

Abstract

(57) [Summary] [Structure] The through hole 7 provided in the tube sheet 4 and the through hole 7 inserted so as to project from the tube sheet 4, and brazed to the inner peripheral portion 12 of the through hole 7 without any gap. The sleeve 8 and the heat transfer tube 14 that is butt-welded to the protruding end surface 11 of the sleeve 8 are eliminated, and it is not necessary to form the portion to be butt-welded to the heat transfer tube 14 by cutting from a thick material. [Effect] The material cost and the processing cost of the tube sheet 4 and the protruding portion can be reduced, and the tube sheet 4 can be manufactured from a thin material, so that the material has excellent workability and heat treatment.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger used in various fields such as petroleum, chemicals and energy.

[0002]

[Prior Art]

 Various types of heat exchangers are used in various fields such as petroleum, chemistry, and energy. As shown in FIG. 3, these heat exchangers have a structure in which a tube sheet 50 is provided with a portion 51 protruding from the tube sheet 50, and a heat transfer tube 52 is joined to the protruding portion 51 by butt welding. In this structure, the heat-exchanged fluid or the like flows inside the heat transfer tube 52 through the through hole 53 penetrating the tube sheet 50 and the protruding portion 51. Then, for the purpose of preventing the occurrence of crevice corrosion, the protruding portion 51 is formed by cutting and is formed integrally with the tube sheet 50.

[0003]

[Problems to be solved by the device]

 However, in the above heat exchanger, since the protruding portion 51 is formed integrally with the tube sheet 50, it has to be cut out from a thick-walled material, resulting in an increase in material cost and a significant processing time. It was Further, as the material becomes thicker, the workability of the material is lowered and the heat treatment is inferior, so that the strength may be lowered.

Therefore, an object of the present invention is to provide a heat exchanger which can reduce the material cost and the processing cost of the tube sheet and the protruding portion and which is excellent in the workability and heat treatment property of the material.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the heat exchanger of the present invention includes a through hole provided in a tube sheet and a through hole inserted into the through hole so as to project from the tube sheet, and a gap is formed in an inner peripheral portion of the through hole. It is characterized in that it has a sleeve that is brazed without heat and a heat transfer tube that is butt-welded to the protruding end surface of the sleeve.

[0006]

[Action]

 According to the heat exchanger of the present invention, the sleeve is inserted into the through hole provided in the tube sheet, the sleeve is brazed to the inner peripheral portion of the through hole without a gap, and the heat transfer tube is attached to the protruding end surface of the sleeve. Butt welding will be performed. Therefore, it is not necessary to form the protruding portion for butt welding with the heat transfer tube by cutting out from a thick material.

[0007]

【Example】

 A heat exchanger according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 2, reference numeral 1 is a heat exchanger of this embodiment, reference numeral 2 is an inflow chamber into which a liquid or the like before heat exchange flows from the outside, and reference numeral 3 is a liquid or the like after heat exchange. , A tube plate for partitioning the inside of the heat exchanger 1 into an inflow chamber 2, an outflow chamber 3, and a heat exchange chamber 5 in which a liquid or the like for exchanging heat flows. Indicate plate members for partitioning the inflow chamber 2 and the outflow chamber 3, respectively.

The tube sheet 4 is provided with one through hole 7 on each of the inflow chamber 2 side and the outflow chamber 3 side, and each through hole 7 has a cylindrical sleeve as shown in FIG. 8 are provided for each. These sleeves 8 are formed longer than the thickness of the tube sheet 4 by a predetermined amount, and one end surface (left side in FIG. 1) 9 of the sleeve 8 has a side surface 10 on the inflow chamber 2 or outflow chamber 3 side of the tube sheet 4. And the other end surface (right side in FIG. 1) is provided so as to project from the tube sheet 4 to the heat exchange chamber 5 side. Here, these sleeves 8 are formed to have a diameter smaller than the diameter of the through hole 7 by a predetermined amount, and the solder 13 is filled and brazed with no gap between the sleeve 8 and the inner peripheral portion 12 of the through hole 7. .

The opening end portions 15 of the heat transfer tubes 14 are butt-welded to the protruding end surfaces 11 of the sleeves 8 on the heat exchange chamber 5 side. These heat transfer tubes 14 are for allowing a liquid or the like to flow inside to exchange heat with an external fluid. The heat transfer tubes 14 on the inflow chamber 2 side and the heat transfer tubes 14 on the outflow chamber 3 side are not shown. The other end is connected.

In the present embodiment, the tube sheet 4 and the sleeve 8 are made of stainless steel such as SUS304 and SUS316. Further, since the paste 13 such as MBF80, MBF50, etc. is used as the solder 13 for joining, the solder 13 is used without any gap between the inner peripheral portion 12 of the through hole 7 and the outer peripheral portion 16 of the sleeve 8. It can be filled easily, and since brazing is performed in this state, crevice corrosion does not occur in this part.

[0012]

[Effect of the device]

 As described above in detail, according to the heat exchanger of the present invention, it is not necessary to machine the butt-welding portion of the heat transfer tube from thick-walled material, so that the material cost and processing of the tube sheet and the protruding portion are reduced. The cost can be reduced. In addition, since the tube sheet is manufactured from a thin material, the material has excellent workability and heat treatment.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a portion related to the present application of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a heat exchanger according to an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view showing a portion corresponding to a portion related to the present application of a conventional heat exchanger.

[Explanation of symbols]

 1 Heat Exchanger 4 Tube Plate 7 Through Hole 8 Sleeve 11 Projecting End Surface 12 Inner Circumferential Section 13 Row 14 Heat Transfer Tube

Claims (1)

[Scope of utility model registration request] 1. A through hole provided in a tube sheet, a sleeve inserted into the through hole so as to project from the tube sheet, and brazed to the inner peripheral portion of the through hole without a gap, and a sleeve of the sleeve. And a heat transfer tube that is butt-welded to the projecting end surface.