Stress relaxation heating device for pulling out heat exchange tube of heat exchanger

Abstract

The utility model discloses a heating device for stress relaxation during pulling out of a heat exchange tube of a heat exchanger, which comprises a metal round bar, the metal round bar is arranged in the heat exchange tube on a tube plate and connected with a positive electrode of a power supply, an insulating rubber sleeve is sleeved on the metal round bar, a metal heating wire is wound on the insulating rubber sleeve, and the metal heating wire is connected with the positive electrode of the power supply. The device is provided with the metal round rod, the insulating rubber sleeve and the metal heating wire, the device is simple in structure and convenient to operate, the heat exchange tube is easy to take out, a large amount of manpower and physical strength do not need to be consumed, the taking-out efficiency of the heat exchange tube is greatly improved, and the device is suitable for popularization and application. The time is saved, the tube plate and the heat exchange tube cannot be damaged, and the maintenance cost of the heat exchange tube of the heat exchanger is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchanger heat exchange tube maintenance equipment, and particularly relates to a stress relaxation heating device when the heat exchange tube of the heat exchanger is pulled out. Background Art

[0002] Existing heat exchanger tube pulling devices include threaded tube pullers, electric spark machines, etc.

[0003] The threaded tube puller is usually custom-made from high-speed steel, with a threaded front and a certain taper. When in use, the thread is screwed into the heat exchange tube to a depth of about 2 / 3 of the tube sheet thickness. Then, the thick nut provided is used to support the end of the tube sheet, and the thread is rotated in the opposite direction to finally pull out the heat exchange tube. This device requires a lot of physical strength and requires skilled personnel to operate. Otherwise, the heat exchange tube is easily broken during the tube pulling process, causing greater maintenance failures. In addition, the tube puller is a hard tube pulling method. During the tube pulling process, friction will occur between the heat exchange tube and the tube sheet hole, causing certain damage to the surface quality of the tube sheet hole.

[0004] The EDM machine uses a copper rod to pass current, which contacts the heat exchange tube to generate sparks, slowly pitting the heat exchange tube to achieve the tube extraction method. However, this method is extremely inefficient and is usually used in conjunction with a threaded tube puller. When a broken tube occurs, the EDM machine and threaded tube puller are used together, which reduces the tube extraction efficiency.

[0005] For this purpose, we propose a stress relaxation heating device when the heat exchange tube of the heat exchanger is pulled out. Utility Model Content

[0006] The purpose of the present utility model is to provide a stress relaxation heating device when the heat exchange tube of a heat exchanger is pulled out, so as to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a stress relaxation heating device for pulling out a heat exchanger tube, comprising:

[0008] A metal round rod, the metal round rod is arranged in the heat exchange tube on the tube sheet, and the metal round rod is connected to the positive electrode of the power supply;

[0009] An insulating rubber sleeve, said insulating rubber sleeve being sleeved on said metal round rod;

[0010] A metal heating wire is wound around the insulating rubber sleeve, one end of the metal heating wire is connected to the metal round rod, and the other end of the metal heating wire is connected to the negative electrode of the power supply.

[0011] Preferably, the insulating rubber sleeve is arranged on the outer side of a section of the metal round rod extending into the heat exchange tube.

[0012] Preferably, the length of the metal heating wire is smaller than the length of the insulating rubber sleeve, and one end of the metal heating wire is flush with the insulating rubber sleeve.

[0013] Preferably, the outer periphery of the metal heating wire does not contact the inner wall of the heat exchange tube.

[0014] Preferably, a first insulating support sleeve is sleeved on a section of the insulating rubber sleeve exposed outside the metal heating wire.

[0015] Preferably, a second insulating support sleeve is sleeved on a section of the metal round rod that is close to the metal heating wire and flush with the insulating rubber sleeve.

[0016] Preferably, the metal round rod is concentrically arranged in the heat exchange tube through the first insulating support sleeve and the second insulating support sleeve.

[0017] Preferably, the first insulating support sleeve and the second insulating support sleeve are both rings made of ceramic material.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The utility model is provided with a metal round rod, an insulating rubber sleeve and a metal heating wire. The metal round rod is connected to the positive electrode of the power supply, one end of the metal heating wire is connected to the metal round rod, and the other end of the metal heating wire is connected to the negative electrode of the power supply. When in use, the power supply is energized, and conduction is carried out through the metal round rod to transmit current to the metal heating wire. The metal heating wire starts to heat, causing the heat exchange tube on the tube plate to start to expand due to heat. However, due to the constraint of the tube plate, the heat exchange tube can only expand within a limited range. After heating to a certain temperature, the power supply is cut off and the temperature of the heat exchange tube begins to drop. Utilizing the principle of thermal expansion and contraction, the heat exchange tube slowly begins to contract until it reaches room temperature, so that the outer diameter of the heat exchange tube after contraction is smaller than the outer diameter before heating, and then the heat exchange tube can be taken out. The utility model has a simple structure and is easy to operate. The heat exchange tube is easy to take out and does not require a lot of manual labor. The efficiency of removing the heat exchange tube is greatly improved, time is saved, and no damage is caused to the tube plate and the heat exchange tube, thereby reducing the maintenance cost of the heat exchange tube of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic cross-sectional structural diagram of the present utility model.

[0021] In the figure: 1. Metal round rod; 2. Tube sheet; 3. Heat exchange tube; 4. Insulating rubber sleeve; 5. Metal heating wire; 6. First insulating support sleeve; 7. Second insulating support sleeve. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1 The utility model provides a stress relaxation heating device for pulling out a heat exchanger tube, comprising:

[0024] A metal round rod 1 is arranged in the heat exchange tube 3 on the tube sheet 2 and is connected to the positive electrode of the power supply;

[0025] The insulating rubber sleeve 4 is sleeved on the metal round rod 1. The insulating rubber sleeve 4 is arranged on the outer side of a section of the metal round rod 1 extending into the heat exchange tube 3. The insulating rubber sleeve 4 plays an insulating role.

[0026] A metal heating wire 5 is wound around the insulating rubber sleeve 4. The length of the metal heating wire 5 is less than that of the insulating rubber sleeve 4, and one end of the metal heating wire 5 is flush with the insulating rubber sleeve 4. The outer periphery of the metal heating wire 5 does not contact the inner wall of the heat exchange tube 3. One end of the metal heating wire 5 is connected to the metal round rod 1, and the other end of the metal heating wire 5 is connected to the negative electrode of the power supply.

[0027] A first insulating support sleeve 6 is sleeved on a section of the insulating rubber sleeve 4 exposed outside the metal heating wire 5, and a second insulating support sleeve 7 is sleeved on a section of the metal round rod 1 close to the metal heating wire 5 and flush with the insulating rubber sleeve 4. The metal round rod 1 is concentrically arranged in the heat exchange tube 3 through the first insulating support sleeve 6 and the second insulating support sleeve 7. The first insulating support sleeve 6 and the second insulating support sleeve 7 are both rings made of ceramic material. The first insulating support sleeve 6 and the second insulating support sleeve 7 play a supporting role on the one hand and an insulating role on the other.

[0028] After the evaporation of heat, the heat exchange tube 3 on the heat exchanger 1 is heated, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of heat is stopped, and the evaporation of

[0029] In summary, the method of using the stress relaxation heating device when the heat exchanger tube of the heat exchanger is pulled out provided in this embodiment is as follows: when in use, the power supply is turned on, and the current is conducted through the metal round rod 1 to transmit the current to the metal heating wire 5. The metal heating wire 5 starts to heat, causing the heat exchange tube 3 on the tube sheet 2 to start to expand due to the heat. However, due to the constraint of the tube sheet 2, the heat exchange tube 3 can only expand within a limited range. After heating to a certain temperature, the power supply is turned off, and the temperature of the heat exchange tube begins to decrease. Using the principle of thermal expansion and contraction, the heat exchange tube 3 slowly begins to shrink until it reaches room temperature, so that the outer diameter of the heat exchange tube 3 after shrinkage is smaller than the outer diameter before heating, so that the stress of the heat exchange tube 3 reaches a relaxed state, and then the heat exchange tube 3 can be taken out.

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stress relaxation heating device for pulling out a heat exchanger tube, characterized in that: include, A metal round rod (1), the metal round rod (1) being arranged in a heat exchange tube (3) on a tube sheet (2), and the metal round rod (1) being connected to a positive electrode of a power supply; An insulating rubber sleeve (4), the insulating rubber sleeve (4) being sleeved on the metal round rod (1); A metal heating wire (5), wherein the metal heating wire (5) is wound on the insulating rubber sleeve (4), one end of the metal heating wire (5) is connected to the metal round rod (1), and the other end of the metal heating wire (5) is connected to the negative electrode of the power supply.

2. The stress relaxation heating device for removing heat exchange tubes of a heat exchanger according to claim 1, characterized in that: The insulating rubber sleeve (4) is arranged on the outer side of a section of the metal round rod (1) that extends into the heat exchange tube (3).

3. The stress relaxation heating device for removing heat exchange tubes of a heat exchanger according to claim 1, characterized in that: The length of the metal heating wire (5) is shorter than the length of the insulating rubber sleeve (4), and one end of the metal heating wire (5) is flush with the insulating rubber sleeve (4).

4. The stress relaxation heating device for removing heat exchange tubes of a heat exchanger according to claim 1, characterized in that: The outer periphery of the metal heating wire (5) does not contact the inner wall of the heat exchange tube (3).

5. The stress relaxation heating device for removing heat exchange tubes of a heat exchanger according to claim 3, characterized in that: A first insulating support sleeve (6) is sleeved on a section of the insulating rubber sleeve (4) exposed outside the metal heating wire (5).

6. The stress relaxation heating device for removing heat exchange tubes of a heat exchanger according to claim 5, characterized in that: A second insulating support sleeve (7) is sleeved on a section of the metal round rod (1) that is close to the metal heating wire (5) and flush with the insulating rubber sleeve (4).

7. The stress relaxation heating device for removing heat exchange tubes of a heat exchanger according to claim 6, characterized in that: The metal round rod (1) is concentrically arranged in the heat exchange tube (3) through the first insulating support sleeve (6) and the second insulating support sleeve (7).

8. The stress relaxation heating device for removing heat exchange tubes of a heat exchanger according to claim 6, characterized in that: The first insulating support sleeve (6) and the second insulating support sleeve (7) are both rings made of ceramic material.

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