A gas tightness test structure for shell-side and tube-side series heat exchanger

Abstract

The present invention relates to an airtightness test structure of a shell-side and tube-side serial heat exchanger, comprising: a shell, a first tube sheet and a second tube sheet, a plurality of first heat exchange tubes are welded on the first tube sheet, a plurality of second heat exchange tubes are welded on the second tube sheet, a longitudinal partition is provided in the shell, a first serial port is provided on the first tube sheet, a second serial port is provided on the second tube sheet, a plug is provided at the end of the second heat exchange tube, the plug comprises: a cone head, a cone body and a step portion, the plug comprises a first side wall located on the side of the step portion and a second side wall located on the side of the cone head, the plug is recessed with a groove from the first side wall to the second side wall, the groove comprises a straight section and a spherical section. When the test pressure rises, the pressure in the plug groove rises and begins to expand, so that the plug is tightly attached to the tube wall of the second heat exchange tube to achieve a self-tight seal.

Description

[Technical field]

[0001] The invention relates to the field of chemical machinery, and in particular to an airtightness test structure of a shell-side and tube-side series heat exchanger. [Background technology]

[0002] A heat exchanger is an energy-saving device that transfers heat between two or more fluids at different temperatures. It transfers heat from a higher temperature fluid to a lower temperature fluid, so that the fluid temperature reaches the specified index of the process to meet the needs of process conditions. It is also one of the main equipment for improving energy utilization. A heat exchanger is generally composed of a shell, a tube sheet and heat exchange tubes. In order to detect the air tightness inside the heat exchanger, the heat exchange tubes are generally blocked by plugs for air tightness tests.

[0003] See also Figure 1 , which discloses an air tightness test structure of a shell-side and tube-side serial heat exchanger in the prior art, comprising: a shell 1', a first tube sheet 2', and a second tube sheet 3' arranged adjacent to the first tube sheet 2', a plurality of first heat exchange tubes 4' are welded on the first tube sheet 2', a plurality of second heat exchange tubes 5' are welded on the second tube sheet 3', a longitudinal partition is arranged in the shell 1', a first serial port is arranged on the first tube sheet 2', thereby connecting the first shell side on the left side with the second tube side on the right side in series, a second serial port is arranged on the second tube sheet 3', thereby connecting the first tube side on the left side with the second shell side on the right side in series, in order to detect the expansion performance of the pipe joint of the first heat exchange tube 4', the second heat exchange tube 5' needs to be blocked by a plug 6', the plug structure in the prior art is relatively simple, and during the test, it is often found that liquid leaks from the fitting point between the plug and the heat exchange tube, thereby affecting the test effect.

[0004] Therefore, it is necessary to provide an airtightness test structure for a shell-side and tube-side series heat exchanger that solves the above-mentioned technical problems. [Summary of the invention]

[0005] In order to solve the above problems, the object of the present invention is to provide an airtightness test structure of a shell-side and tube-side series heat exchanger that can achieve self-tightening sealing.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an airtightness test structure of a shell-side and tube-side serial heat exchanger, comprising: a shell, a first tube sheet, and a second tube sheet arranged adjacent to the first tube sheet, a plurality of first heat exchange tubes are welded on the first tube sheet, a plurality of second heat exchange tubes are welded on the second tube sheet, a longitudinal partition is arranged in the shell, a first serial opening is arranged on the first tube sheet, so as to connect the first shell side on the left with the second tube side on the right, a second serial opening is arranged on the second tube sheet, so as to connect the first tube side on the left with the second shell side on the right, a plug is arranged at the end of the second heat exchange tube, the plug comprises: a cone head, a cone body and a step portion, the step portion abuts against the side wall of the second tube sheet, the plug comprises a first side wall located on the side of the step portion and a second side wall located on the side of the cone head, the plug is recessed with a groove from the first side wall to the second side wall, and the groove comprises a straight line segment and a spherical segment.

[0007] Preferably, the air tightness test structure of a shell-side and tube-side series heat exchanger in the present invention is further configured as follows: the plug is made of plastic rubber.

[0008] Preferably, the air tightness test structure of a shell-side and tube-side serial heat exchanger in the present invention is further configured as follows: the spherical segment is located at the deepest part of the groove.

[0009] Preferably, the air tightness test structure of a shell-side and tube-side serial heat exchanger in the present invention is further configured as follows: the first tube sheet and the second tube sheet are arranged in parallel and are respectively welded to the shell.

[0010] Preferably, the air tightness test structure of a shell-side and tube-side serial heat exchanger in the present invention is further configured as follows: the cone body of the plug and the inner wall of the second heat exchange tube are interference fit.

[0011] Preferably, the air tightness test structure of a shell-side and tube-side serial heat exchanger in the present invention is further configured as follows: the slope of the cone body of the plug is smaller than the slope of the cone head.

[0012] Preferably, the air tightness test structure of a shell-side and tube-side serial heat exchanger in the present invention is further configured as follows: the groove is arranged in the center of the plug.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the present invention comprises the plug including: a cone head, a cone body and a step portion, the step portion abuts against the side wall of the second tube sheet, the plug includes a first side wall located on the side of the step portion and a second side wall located on the side of the cone head, the plug is recessed with a groove from the first side wall to the second side wall, when the test pressure rises, the pressure in the plug groove rises and begins to self-expand, so that the plug is tightly attached to the tube wall of the second heat exchange tube to achieve self-tightening sealing, and in addition, the groove in the present invention includes a spherical segment, which can be subjected to uniform force when under pressure.

Brief Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the air tightness test structure of the shell-side and tube-side series heat exchanger in the prior art.

[0015] Figure 2 It is a schematic front view of the air tightness test structure of the shell-side and tube-side series heat exchanger in the present invention.

[0016] Figure 3 It is a schematic diagram of the structure of the plug in the present invention.

[0017] Figure 4 It is a top view schematic diagram of the air tightness test structure of the shell-side and tube-side series heat exchanger in the present invention.

[0018] Figure 1 Middle: 1`, shell, 2`, first tube sheet, 3`, second tube sheet, 4`, first heat exchange tube, 5`, second heat exchange tube, 6`, plug.

[0019] Figures 2 to 4 In: 1. shell, 2. first tube sheet, 20. first serial port, 21. first shell side, 22. second tube side, 3. second tube sheet, 30. second serial port, 31. first tube side, 32. second shell side, 33. side wall, 4. first heat exchange tube, 5. second heat exchange tube, 6. longitudinal partition, 7. plug, 70. cone head, 71. cone body, 72. step portion, 73. first side wall, 74. second side wall, 75. groove, 750. straight segment, 751. spherical segment. [Specific implementation method]

[0020] The air tightness test structure of a shell-side and tube-side series heat exchanger according to the present invention is further described in detail below through specific embodiments.

[0021] Ginseng Figures 2 to 4As shown, a gas tightness test structure of a shell-side and tube-side serial heat exchanger includes: a shell 1, a first tube sheet 2, and a second tube sheet 3 arranged adjacent to the first tube sheet 2. The first tube sheet 2 and the second tube sheet 3 are arranged in parallel and are respectively welded to the shell 1. A plurality of first heat exchange tubes 4 are welded to the first tube sheet 2, and a plurality of second heat exchange tubes 5 are welded to the second tube sheet 3. A longitudinal partition 6 is arranged in the shell 1. A first serial port 20 is arranged on the first tube sheet 2, so that the first shell side 21 on the left is serially connected with the second tube side 22 on the right. A second serial port 30 is arranged on the second tube sheet 3, so that the first tube side 31 on the left is serially connected with the second shell side 32 on the right.

[0022] The end of the second heat exchange tube 5 is provided with a plug 7, and the plug 7 is made of plastic rubber. The plug 7 includes: a cone head 70, a cone body 71 and a step portion 72. The cone body 71 is interference fit with the inner wall of the second heat exchange tube 5. The slope of the cone body 71 of the plug 7 is smaller than the slope of the cone head 70. The cone head 70 is used for guiding. The step portion 72 abuts against the side wall 33 of the second tube sheet 3. The plug 7 includes a first side wall 73 located on the side of the step portion 72 and a second side wall 74 located on the side of the cone head 70. The plug 7 is recessed with a groove 75 from the first side wall 73 to the second side wall 74. The groove 75 includes a straight segment 750 and a spherical segment 751. The spherical segment 751 is located at the deepest part of the groove 75. The groove 75 is set in the center of the plug 7.

[0023] In summary, the plug 7 of the present invention includes: a cone head 70, a cone body 71 and a step portion 72, the step portion 72 is in contact with the side wall 33 of the second tube sheet 3, the plug 7 includes a first side wall 73 located on the side of the step portion 72 and a second side wall 74 located on the side of the cone head 70, and the plug 7 is recessed with a groove 75 from the first side wall 73 to the second side wall 74. When the test pressure rises, the pressure in the plug groove 75 rises and starts to expand, so that the plug 7 is tightly attached to the tube wall of the second heat exchange tube 5 to achieve self-tight sealing. In addition, the groove 75 in the present invention includes a spherical segment 751, which can be evenly stressed when under pressure.

[0024] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A gas tightness test structure for a shell-side and tube-side series heat exchanger, comprising: A shell, a first tube sheet, and a second tube sheet arranged adjacent to the first tube sheet, a plurality of first heat exchange tubes are welded on the first tube sheet, a plurality of second heat exchange tubes are welded on the second tube sheet, a longitudinal partition is arranged in the shell, a first serial opening is arranged on the first tube sheet, so as to connect the first shell side on the left with the second tube side on the right, a second serial opening is arranged on the second tube sheet, so as to connect the first tube side on the left with the second shell side on the right, a plug is arranged at the end of the second heat exchange tube, characterized in that: the plug comprises: a cone head, a cone body and a step portion, the step portion abuts against the side wall of the second tube sheet, the plug comprises a first side wall located on the side of the step portion and a second side wall located on the side of the cone head, the plug is recessed with a groove from the first side wall to the second side wall, the groove comprises a straight section and a spherical section, the spherical section is located at the deepest part of the groove, and the cone body of the plug is interference fit with the inner wall of the second heat exchange tube.

2. The air tightness test structure of a shell-side and tube-side series heat exchanger according to claim 1, characterized in that: The plug is made of plastic rubber.

3. The air tightness test structure of a shell-side and tube-side series heat exchanger according to claim 1, characterized in that: The first tube sheet and the second tube sheet are arranged in parallel and are respectively welded to the shell.

4. The air tightness test structure of a shell-side and tube-side series heat exchanger according to claim 1, characterized in that: The inclination of the cone body of the plug is smaller than the inclination of the cone head.

5. The air tightness test structure of a shell-side and tube-side series heat exchanger according to claim 1, characterized in that: The groove is arranged at the center of the plug.

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