Titanium heat exchange tube and tube plate welding structure of horizontal shell and tube condenser

Abstract

The utility model relates to a welding structure of a titanium heat exchange tube and a tube plate of a horizontal shell-and-tube condenser, the heat exchange tube is a titanium tube, the tube plate is provided with a connecting hole, the outer wall of the heat exchange tube is in expanded connection with the connecting hole of the tube plate in a penetrating manner, and a section of extension section is reserved on the outer end face of the tube plate in a penetrating manner; a welding section is reserved between the radial inner side face of the groove and the opening hole wall of the connecting hole, the radial width of the welding section is half of the thickness of the pipe wall of the heat exchange pipe, the radial width of the groove is equal to the thickness of the pipe wall of the heat exchange pipe, and the axial depth of the groove is 1.5 times of the thickness of the pipe wall of the heat exchange pipe. The extending section and the welding section of the heat exchange tube are welded into an arc-shaped welding structure with the outer end flush with the outer end face of the tube plate through argon arc welding, the structure is simple, leakage and corrosion can be effectively prevented, and meanwhile welding is firm.

Description

TECHNICAL FIELD

[0001] The utility model relates to a condenser, specifically to a horizontal shell and tube condenser titanium heat exchange pipe and tube plate welding structure. BACKGROUND

[0002] The horizontal shell and tube condenser is an important component of a marine air conditioner, and its performance is related to the normal operation of the air conditioner. The horizontal shell and tube condenser is composed of a shell, a heat transfer pipe bundle, a tube plate, and an end cover. The working principle of the shell and tube condenser is that cooling water passes through the pipe, and refrigerant passes through the shell, that is, high-temperature and high-pressure refrigerant vapor is cooled, condensed, and collected in the shell on the outer surface of the heat transfer pipe bundle. Therefore, the quality of the heat exchange pipe of the heat transfer pipe bundle directly affects the heat exchange efficiency of the shell and tube condenser. During operation, the heat exchange pipe is easily corroded in the medium containing impurities in seawater for a long time, especially at the welding position of the heat exchange pipe and the tube plate. The existing welding mostly adopts the structure of welding the heat exchange pipe at the outer corner after the heat exchange pipe penetrates the tube plate. The penetration joint strength of the heat exchange pipe and the tube plate of this structure is low, and the shell-side refrigerant is easy to leak. At the same time, the welding position is severely corroded, which has become a difficulty in the progress of the industry in terms of safety and service life. SUMMARY

[0003] The utility model provides a horizontal shell and tube condenser titanium heat exchange pipe and tube plate welding structure which is simple in structure, can effectively prevent leakage and corrosion, and is firm in welding.

[0004] The utility model discloses a horizontal shell and tube condenser titanium heat exchange pipe and tube plate welding structure, including heat exchange pipe and tube plate, its characterized in that: the heat exchange pipe is titanium pipe, is set up the joint hole on the tube plate, and the heat exchange pipe outer wall expansion joint penetrates the joint hole of tube plate and leaves a section of the extension section in the tube plate outer end face, is set up a circle recess in the joint hole outer periphery of tube plate outer end face, and the heat exchange pipe is by argon arc welding fusion welding to the recess and is in the fixed connection state with the tube plate.

[0005] The recess is a step structure, and the inner side of the step is connected to the outer wall of the heat exchange pipe.

[0006] The radial inner side of the recess and the opening hole wall of the joint hole leave a fusion joint section, the radial width of the fusion joint section is half of the thickness of the heat exchange pipe wall, the radial width of the recess is equal to the thickness of the heat exchange pipe wall, and the axial depth of the recess is 1.5 times the thickness of the heat exchange pipe wall.

[0007] The heat exchange pipe extension section and the tube plate fusion joint section are argon arc welding fusion welded into an arc-shaped welding structure with the outer end flush with the outer end face of the tube plate.

[0008] The heat exchange pipe extension section is argon arc welding fusion welded into an arc-shaped welding structure with the outer end flush with the outer end face of the tube plate.

[0009] The protruding axial length of the protruding section of the heat exchange pipe exceeds the outer end of the tube sheet (0-0.25) x groove axial depth.

[0010] The argon arc welding adopts a direct current positive connection method tungsten argon arc welding.

[0011] The beneficial effects of the utility model are: adopting the tube sheet to set the fusion welding section, cooperating with the protruding section which penetrates the tube sheet to melt and weld and form together, the self-melting welding mode can effectively prevent the occurrence of pores and cracks, and can avoid the generation of root incomplete penetration and groove edge non-fusion at the same time. The welding position adopts the vertical and horizontal position, which is beneficial to the complete fusion of the protruding section of the heat exchange pipe and the fusion welding section inside the groove of the tube sheet, and small welding line energy and fast welding speed are used as far as possible, so that the crystal grains are small, the welding quality is improved, the welding efficiency is high, the welding quality is high, and the welding efficiency is high; the fusion welding section and the protruding section are self-melting welded, and the welding seam extends to the groove, the welding strength with the tube sheet is strengthened, the welding seam is formed into an arc-shaped welding structure, the sealing property of the tube sheet and the heat exchange pipe is improved on the basis of expansion connection, the leakage of refrigerant in the shell is prevented, the welding seam is viewed, and the use safety and service life of the condenser are improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a tube sheet structure schematic view of the utility model;

[0013] Fig. 2 It is a tube sheet structure schematic view of the utility model;

[0014] Fig. 3 It is a structure schematic view after welding of the utility model.

[0015] In the drawing: tube sheet 1, joint hole 2, groove 3, fusion welding section 4, heat exchange pipe 5, protruding section 6, arc-shaped welding seam structure 7. PREFERRED EMBODIMENT

[0016] Further description is made below in combination with the drawings.

[0017] Figs. 1-3 As shown in the figure, a horizontal shell and tube condenser titanium heat exchange pipe and tube sheet welding structure, including tube sheet 1 and heat exchange pipe 5, heat exchange pipe 5 is titanium pipe, the joint hole 2 is set up on the tube sheet 1, the outer wall of the heat exchange pipe 5 is expanded and connected to the joint hole 2 of the tube sheet 1 and penetrates the outer end surface of the tube sheet 1 and leaves a protruding section 6, a circle of grooves 3 is set up on the outer periphery of the joint hole 2 of the tube sheet 1, the radial inner side of the groove 3 and the opening hole wall between the joint hole 2 are left with a fusion welding section 4, the radial width of the fusion welding section 4 is half of the thickness of the heat exchange pipe 5, the radial width of the groove 3 is equal to the thickness of the heat exchange pipe 5, and the axial depth of the groove 3 is 1.5 times the thickness of the heat exchange pipe 5. The heat exchange pipe 5 is fused and welded into the groove 3 by the direct current positive connection method tungsten argon arc welding through the protruding section and the fusion welding section 4 of the tube sheet 1, and is in a fixed connection state with the tube sheet, and the fusion welding forms an arc-shaped welding seam structure 7.

[0018] In the present embodiment, the axial length of the extended section of the heat exchange tube exceeds the outer end of the tube sheet (0-0.25) x the axial depth of the groove, and the length of the extended section is selected according to the actual welding requirement.

Claims

1. A horizontal shell-and-tube condenser titanium heat exchange tube and tube sheet welding structure, comprising a heat exchange tube and a tube sheet, characterized in that: The heat exchange pipe is a titanium pipe, the pipe plate is provided with an interface hole, the outer wall of the heat exchange pipe is expanded to pass through the interface hole of the pipe plate and leave a section of extension section outside the outer end surface of the pipe plate, a groove is arranged on the outer periphery of the interface hole of the outer end surface of the pipe plate, and the heat exchange pipe is fused to the groove through the extension section by argon arc welding to be fixedly connected with the pipe plate.

2. The welding structure of the horizontal shell-and-tube condenser titanium heat exchange tube and tube sheet according to claim 1, characterized in that: The groove is a stepped structure, and the inner side of the step is communicated to the outer wall of the heat exchange pipe.

3. The welding structure of the horizontal shell-and-tube condenser titanium heat exchange tube and tube sheet according to claim 1, characterized in that: The radially inner side of the groove and the opening hole wall of the interface hole are left with a fusion section, the radial width of the fusion section is half of the thickness of the wall of the heat exchange pipe, the radial width of the groove is equal to the thickness of the wall of the heat exchange pipe, and the axial depth of the groove is 1.5 times the thickness of the wall of the heat exchange pipe.

4. The welded structure of the titanium heat exchange tube and the tube sheet of the horizontal shell and tube condenser according to claim 3, characterized in that: The extension section of the heat exchange pipe and the fusion section of the pipe plate are fused into an arc-shaped welding structure with the outer end being flush with the outer end surface of the pipe plate by argon arc welding.

5. The welded structure of the titanium heat exchange tube and tube sheet of horizontal shell and tube condenser according to claim 1 or 2 or 3, characterized in that: The extension section of the heat exchange pipe is fused into an arc-shaped welding structure with the outer end being flush with the outer end surface of the pipe plate by argon arc welding.

6. The welded structure of the titanium heat exchange tube and tube sheet of horizontal shell and tube condenser according to claim 1 or 2 or 3, characterized in that: The extension section of the heat exchange pipe extends axially by a length exceeding (0-0.25) x the axial depth of the groove.

7. The welded structure of the titanium heat exchange tube and the tube sheet of the horizontal shell and tube condenser according to claim 1, characterized in that: The argon arc welding adopts a direct current positive connection method tungsten electrode argon arc welding.

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