Tool for welding tube plate and heat exchange tube in titanium tubular heat exchanger

Abstract

The utility model provides a tool for welding a tube plate and a heat exchange tube in a titanium tubular heat exchanger, which relates to the field of tubular heat exchanger welding and comprises a protective plate and a protective tube fixedly connected with one end of the protective plate, and the protective tube is inserted into the heat exchange tube and clamped at the top of the heat exchange tube. The outer diameter of the protection plate is at least 0.2 cm longer than that of the heat exchange tube; the outer diameter of the protection tube is smaller than the inner diameter of the heat exchange tube, that is, an annular overflowing channel is formed between the protection tube and the heat exchange tube after the protection tube is inserted into the heat exchange tube, a plurality of vent holes communicated with the overflowing channel and a central hole in the protection tube are formed in the peripheral surface of the protection tube, and the distance between the vent holes and the bottom surface of the protection plate is smaller than or equal to 4cm; the welding tool has the beneficial effects that the welding tool is inserted into the heat exchange tube, the heat exchange tube and the tube plate are shielded by matching with the protection plate, argon is introduced into the center hole, and the argon is blown to the top of the heat exchange tube through the vent holes to achieve the cooling purpose, so that the problem of embrittlement between the heat exchange tube and the tube plate which are not welded is solved, and the welding quality of a heat exchanger is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of pipe heat exchanger welding, and especially provides a tool for welding between the tube plate and heat exchange pipe of titanium material pipe heat exchanger. BACKGROUND

[0002] The pipe heat exchanger used in petrochemical enterprises has high water quality salinity and silt degree in the working environment, so the heat exchanger in this environment needs to be resistant to erosion, wear and tear, and the hardness should meet the demand, therefore, the titanium material pipe heat exchanger is developed, that is, the tube plate and heat exchange pipe of the pipe heat exchanger are made of titanium material.

[0003] The welding process of the titanium material pipe heat exchanger is the same as other material heat exchangers, that is, a heat exchange pipe is inserted into the tube plate, the top of the heat exchange pipe is flush with the top surface of the tube plate, and then the heat exchange pipe and the tube plate are welded, and the welding temperature is as high as several hundred degrees Celsius. However, the titanium material heat exchanger has problems in the welding process: the titanium material is unstable after heating, mainly involving problems such as oxidation and embrittlement at high temperature, and if the surrounding heat exchange pipes are not welded at the same time, they will be heated to a high temperature without protection, which will easily cause embrittlement and oxidation, affect the quality of the heat exchanger, and cause problems such as easy corrosion and short service life of the heat exchanger.

[0004] Therefore, the company has developed a tool for welding between the tube plate and heat exchange pipe of the titanium material pipe heat exchanger. SUMMARY

[0005] The utility model discloses a kind of tool for welding between the tube plate and heat exchange pipe of titanium material pipe heat exchanger, which is cooled by argon gas to the top of the heat exchange pipe not welded, and the tube plate around the heat exchange pipe is shielded and protected.

[0006] The technical scheme of the utility model is as follows:

[0007] A tool for welding between the tube plate and heat exchange pipe of titanium material pipe heat exchanger, comprising a protection plate and a protection pipe fixedly connected to one end of the protection plate, the protection pipe is inserted into the heat exchange pipe, and the protection plate is clamped on the top of the heat exchange pipe.

[0008] The outer diameter length of the protection plate is at least 0.2 cm longer than the outer diameter length of the heat exchange pipe.

[0009] The outer diameter length of the protection pipe is smaller than the inner diameter length of the heat exchange pipe, that is, there is an annular flow passage between the protection pipe and the heat exchange pipe after the protection pipe is inserted into the heat exchange pipe, the peripheral surface of the protection pipe is provided with a plurality of air holes connected to the flow passage and the central hole inside the protection pipe, and the distance from the air holes to the bottom surface of the protection plate is ≤4 cm.

[0010] Further, the protection pipe is cylindrical, and the protection plate is in the shape of a round cake.

[0011] The thickness of the protection plate is between 0.1cm-4cm, preferably 2cm;

[0012] Preferably, the outer diameter of the protection plate is 1cm longer than the outer diameter of the heat exchange tube;

[0013] Further, the outer diameter of the protection tube is between 2cm-12cm, preferably 9cm; the diameter of the central hole inside the protection tube is between 2cm-5cm, preferably 2.5cm;

[0014] The circumferential surface of the protection tube is provided with a plurality of equally spaced air holes;

[0015] Preferably, the number of air holes is 6, and the center points of the air holes coincide, the diameter of each air hole is between 0.5cm-5cm, preferably 1.5cm;

[0016] Further, the air holes are linear from inside to outside or the air holes have an upward trend from inside to outside, that is, the distance between the center point of the air hole inside the protection tube and the bottom of the protection plate is greater than the distance between the center point of the air hole outside the protection tube and the bottom of the protection plate;

[0017] The distance between the air hole outside the protection tube and the bottom of the protection plate is preferably 0.5cm;

[0018] Further, at least two limiting tubes are symmetrically arranged on the outer circumferential surface of the protection tube, and the length of the protection tube is shorter than the distance between the outer diameter of the protection tube and the inner diameter of the heat exchange tube by 0.1mm-0.3mm;

[0019] The outer circumferential surface of the protection tube is provided with a protection ring fixedly connected with the protection plate, the outer diameter of the protection ring is ≤ the outer diameter of the protection plate, and the inner diameter of the protection ring is > the outer diameter of the heat exchange tube, further, the protection ring is buckled on the tube plate, and the argon is blown from the central hole to the air hole, the flow channel, and the tube plate and the heat exchange tube in turn;

[0020] Further, a sealing ring is arranged on the protection ring between the protection ring and the tube plate;

[0021] Further, the protection plate, the protection tube, and the protection ring are all made of metal, preferably copper;

[0022] The utility model has the advantages and positive effects that:

[0023] The device protects and cools the tube plate and the non-welded heat exchange tube, thereby further ensuring the welding quality of the heat exchanger.

[0024] Since the air holes have an upward trend from inside to outside, the argon gas directly blows the normal temperature gas to the top of the heat exchange tube, thereby achieving better cooling effect and avoiding the oxidation and embrittlement of the non-welded heat exchange tube in the high-temperature environment.

[0025] Since the two limiting tubes are symmetrically arranged on the outer circumferential surface of the protection tube, the protection tube is located in the center of the heat exchange tube, and the argon gas can uniformly flow back from the flow passage.

[0026] The argon gas is blown from the center hole to the air hole, the flow passage and the gap between the tube plate and the non-welded heat exchange tube, thereby cooling the non-welded heat exchange tube and the tube plate around the heat exchange tube, further ensuring that the non-welded heat exchange tube and the surrounding tube plate do not become brittle and oxidized, and the welding quality of the heat exchanger is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a bottom view of the tool for welding the tube plate and the heat exchange tube in the titanium tube heat exchanger.

[0028] Figure 2 is a front view of the tool for welding the tube plate and the heat exchange tube in the titanium tube heat exchanger.

[0029] Figure 3 is a front view of the tool for welding the tube plate and the heat exchange tube in the titanium tube heat exchanger with limiting tubes.

[0030] Figure 4 is a front view of the tool for welding the tube plate and the heat exchange tube in the titanium tube heat exchanger with a protection ring.

[0031] In the drawings:

[0032] 1. protection plate 2. protection tube 3. heat exchange tube

[0033] 4. tube plate 5. flow passage 6. center hole

[0034] 7. Vent hole 8. Limiting tube 9. Protection ring DETAILED DESCRIPTION

[0035] Embodiment 1

[0036] A tool for welding the tube plate and the heat exchange tube in a titanium tube heat exchanger, as shown in Figure 1 and Figure 2 , comprises a protection plate 1 and a protection tube 2 which is integral with one end of the protection plate 1, both of which are made of copper, the protection tube 2 is inserted into the heat exchange tube 3 and the protection plate 1 is clamped on the top of the heat exchange tube 3; the protection tube 2 is cylindrical and the protection plate 1 is a round cake; the outer diameter length of the protection plate 1 is 1 cm longer than the outer diameter length of the heat exchange tube 3; the thickness of the protection plate 1 is 2 cm; the outer diameter length of the protection tube 2 is smaller than the inner diameter length of the heat exchange tube 3, that is, there is an annular flow passage 5 between the protection tube 2 and the heat exchange tube 3 after the protection tube 2 is inserted into the heat exchange tube 3, six vent holes 7 are equidistantly arranged on the circumference of the protection tube 2 and connected with the flow passage 5 and the internal center hole 6 of the protection tube 2, the diameter of each vent hole 7 is 1.5 cm, the center points of the six vent holes 7 coincide, and the distance between the vent holes 7 and the bottom surface of the protection plate 1 is 1 cm; the outer diameter of the protection tube 2 is 9 cm; the diameter of the internal center hole 6 of the protection tube 2 is 2.5 cm; as shown in Figure 2 , the vent hole 7 is linear from inside to outside.

[0037] During work, the protection tube 2 in the tool for welding the tube plate 4 and the heat exchange tube 3 in a titanium tube heat exchanger is inserted into the un-welded heat exchange tube 3, at this time the protection plate 1 blocks the gap between the heat exchange tube 3 and the tube plate 4, when one tube plate 4 and the heat exchange tube 3 are welded, high temperature is generated, at the same time the hot gas heats the surrounding, due to the blocking effect of the protection plate 1 combined with the thickness of the protection plate 1, the temperature between the un-welded heat exchange tube 3 and the tube plate 4 does not rise rapidly, by introducing argon gas at room temperature into the internal center hole 6 of the protection tube 2, the argon gas is blown to the top of the heat exchange tube 3 through the vent hole 7 and cools the top of the heat exchange tube 3, avoiding the oxidation and embrittlement of the heat exchange tube 3 caused by heating, which affects the welding quality in the later stage, the argon gas continuously cools the heat exchange tube 3 and is blown out through the flow passage 5.

[0038] Therefore, by protecting and cooling the tube plate 4 and the surrounding of the un-welded heat exchange tube 3 through the device, the welding quality of the heat exchanger is further ensured.

[0039] Embodiment 2

[0040] A tool for welding the tube plate and the heat exchange tube in a titanium tube heat exchanger, as shown in Figure 1 and Figure 3As shown, it comprises a protection plate 1 and a protection tube 2 which is integral with one end of the protection plate 1, both of which are made of copper, the protection tube 2 is inserted into the heat exchange tube 3 and the protection plate 1 is clamped at the top of the heat exchange tube 3; the protection tube 2 is cylindrical, and the protection plate 1 is a round cake; the outer diameter length of the protection plate 1 is 2 cm longer than the outer diameter length of the heat exchange tube 3; the thickness of the protection plate 1 is 2.5 cm; the outer diameter length of the protection tube 2 is smaller than the inner diameter length of the heat exchange tube 3, that is, there is an annular flow passage 5 between the protection tube 2 and the heat exchange tube 3 after the protection tube 2 is inserted into the heat exchange tube 3, the circumferential surface of the protection tube 2 is equally provided with 8 air vents 7 connected with the flow passage 5 and the internal center hole 6 of the protection tube 2, the diameter of each air vent 7 is 1.2 cm, the center points of the 6 air vents 7 are coincident, and the distance between the air vent 7 and the bottom surface of the protection plate 1 is 0.5 cm; the outer diameter of the protection tube 2 is 10 cm; the diameter of the internal center hole 6 of the protection tube 2 is 3 cm; as shown Figure 3 The air vent 7 has an upward trend from inside to outside, that is, the distance between the center point of the air vent 7 in the protection tube 2 and the bottom of the protection plate 1 is greater than the distance between the center point of the air vent 7 outside the protection tube 2 and the bottom of the protection plate 1; two limiting tubes 8 are symmetrically arranged on the circumferential surface of the protection tube 2, and the length of the protection tube 2 is 0.1 mm shorter than the spacing between the outer diameter of the protection tube 2 and the inner diameter of the heat exchange tube 3.

[0041] During work, the protection tube 2 in the tool for welding the tube plate 4 and the heat exchange tube 3 in the titanium tube heat exchanger is inserted into the un-welded heat exchange tube 3, at this time the protection plate 1 shields the gap between the heat exchange tube 3 and the tube plate 4, when one tube plate 4 and the heat exchange tube 3 are welded to generate high temperature, at the same time the hot gas heats its surroundings, due to the shielding effect of the protection plate 1 combined with the thickness of the protection plate 1, the temperature between the un-welded heat exchange tube 3 and the tube plate 4 does not rise rapidly, by passing argon gas at room temperature into the internal center hole 6 of the protection tube 2, the argon gas blows to the top of the heat exchange tube 3 through the air vent 7 and cools the top of the heat exchange tube 3, avoiding the heat exchange tube 3 being heated and embrittled to affect the welding quality in the later stage, the argon gas continuously cools the heat exchange tube 3 and then blows out through the flow passage 5.

[0042] In this process, since the air vent 7 has an upward trend from inside to outside, the argon gas more directly blows room temperature gas to the top of the heat exchange tube 3 to cool the heat exchange tube 3 and avoid oxidation and embrittlement problems caused by high temperature environment.

[0043] Since the two limiting tubes 8 are symmetrically arranged on the circumferential surface of the protection tube 2, the protection tube 2 is located in the center of the heat exchange tube 3, which is convenient for the argon gas to uniformly flow back from the flow passage 5.

[0044] Therefore, by protecting and cooling the tube plate 4 and the surroundings of the un-welded heat exchange tube 3 through the device, the welding quality of the heat exchanger is further guaranteed.

[0045] Embodiment 3:

[0046] A tool for welding a tube sheet and heat exchange tubes in a titanium tube heat exchanger, as shown in Figure 4 On the basis of embodiment 2, an annular protection ring 9 fixedly connected with the protection plate 1 is arranged on the outer circumferential surface of the protection tube 2, the outer diameter length of the protection ring 9 is less than or equal to the outer diameter length of the protection plate 1, the inner diameter length of the protection ring 9 is greater than the outer diameter length of the heat exchange tube 3, the protection ring 9 is buckled on the tube sheet 4, and a sealing ring is arranged on the protection ring 9 between the protection ring 9 and the tube sheet 4;

[0047] During the welding process, argon is blown from the center hole 6 to the vent hole 7, the flow channel 5, and between the tube sheet 4 and the un-welded heat exchange tube 3, so that the un-welded heat exchange tube 3 and the tube sheet 4 around the heat exchange tube 3 are cooled by argon, and the brittle and oxidation phenomena of the un-welded heat exchange tube 3 and the tube sheet 4 around the heat exchange tube 3 are further prevented, and the welding quality of the heat exchanger is ensured by the present application.

[0048] The above describes one embodiment of the present application in detail, but the content is only a preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements within the scope of the present application should still belong to the patent coverage of the present application.

Claims

1. A tool for welding the tube sheet and heat exchange tube in a titanium tubular heat exchanger, characterized by: The protection plate and the protection tube fixedly connected with one end of the protection plate are inserted into the heat exchange tube and the protection plate is clamped on the top of the heat exchange tube. The outer diameter length of the protection plate is at least 0.2 cm longer than the outer diameter length of the heat exchange tube. The outer diameter length of the protection tube is smaller than the inner diameter length of the heat exchange tube, that is, the annular flow channel is arranged between the protection tube and the heat exchange tube after the protection tube is inserted into the heat exchange tube, the peripheral surface of the protection tube is provided with a plurality of air holes connected with the flow channel and the central hole in the protection tube, and the distance from the air holes to the bottom surface of the protection plate is ≤4 cm.

2. The tool for welding the tube sheet and the heat exchange tubes of the titanium material pipe type heat exchanger according to claim 1, characterized in that: The thickness of the protection plate is between 0.1 cm and 4 cm.

3. The tool for welding the tube sheet and the heat exchange tubes of the titanium material pipe type heat exchanger according to claim 2, characterized in that: The outer diameter of the protection tube is between 2 cm and 12 cm, and the diameter of the central hole in the protection tube is 2.5 cm.

4. The tool for welding the tube sheet and the heat exchange tubes of the titanium material pipe type heat exchanger according to claim 1, characterized in that: The thickness of the protection plate is 2 cm, the outer diameter length of the protection plate is 1 cm longer than the outer diameter length of the heat exchange tube, the outer diameter of the protection tube is 9 cm, and the diameter of the central hole in the protection tube is 2.5 cm.

5. The tool for welding the tube sheet and the heat exchange tubes of the titanium material pipe type heat exchanger according to claim 1, characterized in that: The peripheral surface of the protection tube is provided with a plurality of equidistantly distributed air holes, and the distance from the outer air holes of the protection tube to the bottom surface of the protection plate is 0.5 cm.

6. The tool for welding the tube sheet and the heat exchange tubes of the titanium tubular heat exchanger according to claim 5, characterized in that: The number of the air holes is 6, the center points of the air holes are coincident, and the diameter of each air hole is between 0.5 cm and 5 cm.

7. The tool for welding the tube sheet and the heat exchange tubes of a titanium tubular heat exchanger according to any one of claims 1-6, characterized in that: The air holes are linear from inside to outside or the air holes are inclined from inside to outside, that is, the distance from the center point of the air hole in the protection tube to the bottom of the protection plate is greater than the distance from the center point of the air hole outside the protection tube to the bottom of the protection plate.

8. The tool for welding the tube sheet and the heat exchange tubes of the titanium tubular heat exchanger according to claim 7, characterized in that: At least two limiting tubes are symmetrically arranged on the peripheral surface of the protection tube, and the length of the protection tube is 0.1 mm-0.3 mm shorter than the spacing between the outer diameter of the protection tube and the inner diameter of the heat exchange tube.

9. The tool for welding the tube sheet and the heat exchange tubes of a titanium tubular heat exchanger according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8, characterized in that: The peripheral surface of the protection tube is provided with a ring-shaped protection ring fixedly connected with the protection plate, the outer diameter length of the protection ring is ≤ the outer diameter length of the protection plate, the inner diameter length of the protection ring is > the outer diameter length of the heat exchange tube, and further, the protection ring is buckled on the tube plate.

10. The tool for welding the tube sheet and the heat exchange tubes of a titanium tubular heat exchanger according to claim 9, characterized in that: The sealing ring is arranged on the protection ring between the protection ring and the tube plate.

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