Heat exchange tube with welding protection structure and heat exchanger tube plate

Abstract

The application discloses a heat exchange tube with a welding protection structure and a heat exchanger tube plate, which comprise a main tube, a locking portion and a half push-out portion arranged on the inner side of a tube body; and a protection tube sleeve, which comprises a T-shaped pipe fitting arranged on the end of the tube body in a detachable manner, a connecting portion and a separation portion arranged on the outer side wall of the T-shaped pipe fitting; the tube body and the heat exchanger tube plate are connected through welding, after the welding is completed, the deep pipe of the T-shaped pipe fitting is inserted into the inner side of the tube body, when the T-shaped pipe fitting is inserted, the locking portion is located between the connecting portion and the separation portion, when the deep pipe reaches the connecting position, the T-shaped pipe fitting is rotated, the connecting portion is driven to rotate and drive the locking portion, the position of the T-shaped pipe fitting is locked through the locking portion, at this time, the annular baffle of the T-shaped pipe fitting is protected at the welding joint between the tube body and the heat exchanger tube plate, and fluid washing and corrosion of the welding joint are avoided.

Description

Technical Field

[0001] This invention relates to the technical field of forest stand growth models, and more particularly to a heat exchanger tube and heat exchanger tube sheet with a welded protective structure. Background Technology

[0002] Currently, heat exchangers are important equipment in many industrial fields such as petroleum, chemical, power, light industry, food and nuclear energy. Heat exchange tubes and tube sheets are the only barrier between the tube side and shell side of the heat exchanger. The connection structure and connection quality between the tube sheet and the heat exchange tubes determine the quality and service life of the heat exchanger.

[0003] The welded joints of heat exchanger tubes and heat exchanger tube sheets are in a complex fluid environment and are constantly subjected to scouring and corrosion by the shell-side fluid. In particular, the failure phenomenon is more serious when in corrosive fluids. The failure of welded joints will lead to frequent shutdowns and maintenance of the entire unit, causing great economic losses to the enterprise. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problem that the weld joints of existing heat exchanger tubes and heat exchanger tube sheets with weld protection structures are easily eroded and corroded, this invention is proposed.

[0006] Therefore, the object of this invention is to provide a heat exchange tube with a weld protection structure.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a main pipe including a pipe body and a locking part and a semi-extrusion part disposed on the inner side of the pipe body; a protective sleeve including a detachable T-shaped pipe fitting disposed at the end of the pipe body, a connecting part and a disengaging part disposed on the outer wall of the T-shaped pipe fitting; when the T-shaped pipe fitting rotates at the end of the pipe body, the connecting part can drive the locking part to lock the T-shaped pipe fitting to the pipe body, and the disengaging part can drive the semi-extrusion part to separate from the T-shaped pipe fitting.

[0008] As a preferred embodiment of the heat exchange tube with welding protection structure described in this invention, the locking part includes a column and a pop-out component. The column is formed inside the tube body, and a slot is provided at one end near the tube body. The pop-out component is slidably connected to the outside of the column.

[0009] As a preferred embodiment of the heat exchange tube with welding protection structure described in this invention, the pop-out component includes a pressure ring, an action ring, a linkage spring, and an insert.

[0010] The pressure ring is slidably disposed on the outside of the column, and its outer wall is provided with a protruding pressure block;

[0011] The working ring is also slidably disposed on the outside of the column, and there is a gap between its sliding track and the sliding track of the pressure ring;

[0012] The linkage spring is sleeved on the outside of the column, and its sleeve position is located between the pressure ring and the action ring.

[0013] The insert is disposed on the actuating ring, and its position is located on the side of the actuating ring away from the pressure ring.

[0014] As a preferred embodiment of the heat exchange tube with welding protection structure described in this invention, the connecting part includes a first arc block, a push plate, and a central ring;

[0015] The first arc block is formed on the outer wall of the T-shaped pipe fitting, and a through arc groove is formed on it;

[0016] The push plate is formed on the first arc block. When the first arc block rotates, the push plate can push the pressure ring to slide in the direction of the action ring.

[0017] The central ring is formed on the outer wall of the T-shaped pipe fitting, and a positioning hole is provided on it;

[0018] When the first arc block is inserted into the inner side of the slot, the push plate can drive the action ring to push the insert into the inner side of the positioning hole.

[0019] As a preferred embodiment of the heat exchange tube with welding protection structure described in this invention, the semi-extrusion portion includes a casing, an internal spring, a pressing block, and a pushing column;

[0020] The sleeve is disposed on the inner side of the pipe fitting, and an opening is provided at one end of the sleeve adjacent to the T-shaped pipe fitting;

[0021] The built-in spring is located on the inside of the casing;

[0022] The extrusion block is slidably disposed on the inner side of the housing, and its sidewall is provided with a limiting protrusion extending to the outer side of the housing.

[0023] The push column is formed on the side of the extrusion block away from the built-in spring; when the push column is pressed by the protective sleeve, it can push the extrusion block to press the built-in spring.

[0024] As a preferred embodiment of the heat exchange tube with welding protection structure described in this invention, the detachment portion includes a second arc block and a pressing member. The second arc block is formed on the outer wall of the T-shaped tube, and the pressing member is formed on one end of the second arc block, with a downward inclined surface provided on the side away from the T-shaped tube.

[0025] As a preferred embodiment of the heat exchange tube with welding protection structure described in this invention, the T-shaped tube is further provided with an unlocking part, which includes an inner extension tube, an outer column, an inner column, and a reset spring.

[0026] The inner tube is formed on the T-shaped tube, and its position corresponds to the position of the positioning hole.

[0027] The outer column is slidably connected to the inner side of the inner tube;

[0028] The inner column is fixed at the end of the outer column away from the T-shaped tube, and the end away from the outer column extends to the outside of the inner extension tube.

[0029] The reset spring is sleeved on the outside of the inner cylinder, and its sleeve position is located between the outer cylinder and the end of the inner extension tube away from the T-shaped fitting.

[0030] As a preferred embodiment of the heat exchange tube with welding protection structure described in this invention, the inner side of the tube body is provided with a tube wall protrusion, the end of the tube wall protrusion is provided with an installation groove, and the installation positions of the locking part and the semi-pull-out part are located in the installation groove.

[0031] The beneficial effects of the heat exchanger tube with weld protection structure in this invention are as follows: the tube body and the heat exchanger tube sheet are connected by welding. After welding, the inlet tube of the T-shaped fitting is inserted into the inside of the tube body. When the T-shaped fitting is inserted, the locking part is located between the connecting part and the disengaging part. When the inlet tube reaches the connecting position, the T-shaped fitting is rotated, so that the T-shaped fitting drives the connecting part to rotate and drives the locking part. The position of the T-shaped fitting is locked by the locking part. At this time, the annular baffle of the T-shaped fitting protects the weld joint between the tube body and the heat exchanger tube sheet, preventing fluid from eroding and corroding the weld joint.

[0032] In view of the problem that the weld joints of the existing heat exchanger tubes and heat exchanger tube sheets with weld protection structures are easily eroded and corroded, the present invention also provides a heat exchanger tube sheet for use with the heat exchanger tubes with weld protection structures, including a plate body, wherein the plate body has mounting holes and a welding groove is formed on the plate body at the end of the mounting holes.

[0033] In a preferred embodiment of the heat exchanger tube sheet of the present invention, the tube wall is raised and a first sealing groove is provided inside the mounting groove, the end of the T-shaped tube is provided with a first sealing ring corresponding to the position of the first sealing groove, a second sealing groove is provided on one side of the plate and at the corresponding position of the mounting hole, and a second sealing ring is provided on the T-shaped tube and in the second sealing groove.

[0034] The beneficial effects of the heat exchanger tube sheet in this invention are as follows: After the tube is fitted, the tube and the plate 301 are welded at the welding groove 303, so that the weld joint is inside the welding groove 303 without any protrusion. After the T-shaped tube 201 is installed, it completely covers the welding groove 303, avoiding the fluid from scouring the weld. The first sealing ring 201a enters the inside of the first sealing groove 101c, and the second sealing ring 201b enters the inside of the second sealing groove 304, thereby minimizing the contact between the fluid and the weld joint. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0036] Figure 1 This is a schematic diagram of the overall structure of the heat exchanger tube and heat exchanger tube sheet with welding protection structure of the present invention.

[0037] Figure 2 This is a cross-sectional view of the main pipe and protective sleeve structure of the heat exchanger tube with welding protection structure of the present invention.

[0038] Figure 3 This is a schematic diagram of the protective sleeve structure of the heat exchanger tube with welding protection structure according to the present invention.

[0039] Figure 4 This is a schematic diagram of the connection and separation parts of the heat exchanger tube with welding protection structure according to the present invention.

[0040] Figure 5 This is a schematic diagram of the locking part structure of the heat exchanger tube with welding protection structure according to the present invention.

[0041] Figure 6 This is a schematic diagram of the unlocking part of the heat exchanger tube with welding protection structure according to the present invention.

[0042] Figure 7 This is an exploded view of the semi-pull-out portion structure of the heat exchanger tube with welding protection structure according to the present invention.

[0043] Figure 8This is a cross-sectional view of the main pipe structure of the heat exchanger tube with welding protection structure according to the present invention.

[0044] Figure 9 This is a schematic diagram of the plate structure of the heat exchanger tube sheet of the present invention.

[0045] Figure 10 This is a schematic diagram of the overall internal structure of the heat exchanger tube and heat exchanger tube sheet with welding protection structure according to the present invention.

[0046] Figure 11 The heat exchanger tube and heat exchanger tube sheet of the present invention have a weld protection structure. Figure 10 Enlarged structural diagram at point A in the middle. Detailed Implementation

[0047] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0048] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0049] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0050] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0051] Example 1

[0052] Reference Figures 1-3 A schematic diagram of the overall structure of a heat exchanger tube with a weld protection structure is provided, as shown below. Figure 1 A heat exchange tube with a weld protection structure includes a main tube 100, which includes a tube body 101 and a locking part 102 and a semi-pull-out part 103 disposed on the inner side of the tube body 101; and a protective tube sleeve 200, which includes a detachable T-shaped tube fitting 201 disposed at the end of the tube body 101, a connecting part 202 disposed on the outer wall of the T-shaped tube fitting 201, and a detaching part 203.

[0053] Specifically, when the T-shaped fitting 201 rotates at the end of the pipe body 101, the connecting part 202 can drive the locking part 102 to lock the T-shaped fitting 201 to the pipe body 101, and the disengaging part 203 can drive the semi-extrusion part 103 to separate from the T-shaped fitting 201. After one end of the T-shaped fitting 201 enters the inside of the main pipe 100, the connecting part 202 is rotated by rotating the T-shaped fitting 201, thereby driving the locking part 102 to lock the position of the T-shaped fitting. At the same time, the disengaging part 203 separates the semi-extrusion part 103 from the T-shaped fitting 201.

[0054] Furthermore, there is a gap between the disengaging part 203 and the connecting part 202. When the T-shaped tube 201 is inserted, the semi-pushing part and the locking part 102 are located between the disengaging part 203 and the connecting part 202. By rotating the T-shaped tube 201, the disengaging part 203 can be rotated to contact the semi-pushing part 103. At the same time, the connecting part 202 is driven to contact and drive the locking part 102 to lock the position of the T-shaped tube 201.

[0055] Furthermore, the end of the T-shaped fitting 201 that extends into the tube body 101 is the in-line tube, and both the connecting part 202 and the disengaging part 203 are provided on the in-line tube. The end of the T-shaped fitting 201 away from the in-line tube is provided with a circular baffle. When the in-line tube extends to the connection position with the fitting, the circular baffle contacts one end of the tube body 101, shielding the weld joint between the tube body 101 and the heat exchanger tube sheet on which it is installed.

[0056] Furthermore, the T-shaped fitting 201 used in the invention is an active metal. In the fluid of the heat exchanger, its open circuit potential is more negative than that of the tube sheet, heat exchange tubes and their welds, and its current efficiency is high. It can form cathodic protection for the heat exchange tubes, tube sheet and their welds, effectively reducing the electrochemical corrosion of the tube sheet welds, significantly improving the service life of the welds, and the active metal corrosion is uniform. The corrosion products cover the weld surface, further protecting the welds.

[0057] Furthermore, the T-fitting 201 is made of zinc-based or aluminum-based alloy. Compared to the heat exchange tubes, tube sheets, and various areas of the weld, the T-fitting 201 has a lower potential and will preferentially dissolve. The released current polarizes the heat exchange tubes, tube sheets, and various areas of the weld to the required potential, thereby achieving protection. Aluminum alloys are suitable for high-temperature and high-pressure fluids and have the characteristic of low electrode potential under higher temperature conditions. Zinc alloys are suitable for lower-temperature fluids and have higher current efficiency and better protection effect in low-temperature environments.

[0058] Operation process: The tube body 101 and the heat exchanger tube sheet are connected by welding. After welding, the inlet tube of the T-shaped fitting 201 is inserted into the inside of the tube body 101. When the T-shaped fitting 201 is inserted, the locking part 102 is located between the connecting part 202 and the disengaging part 203. When the inlet tube reaches the connection position, the T-shaped fitting 201 is rotated, so that the T-shaped fitting 201 drives the connecting part 202 to rotate and drives the locking part 102. The locking part 102 locks the position of the T-shaped fitting 201. At this time, the annular baffle of the T-shaped fitting 201 protects the welded joint between the tube body 101 and the heat exchanger tube sheet to prevent fluid from scouring and corroding the welded joint.

[0059] Example 2

[0060] Reference Figures 2 to 6 This embodiment differs from the first embodiment in that: the locking part 102 includes a column 102a and a pop-out member 102c. The column 102a is formed inside the tube body 101, and a slot 102b is provided at one end near the tube body 101. The pop-out member 102c is slidably connected to the outside of the column 102a. The connecting part 202 includes a first arc block 202a, a push plate 202b, and a central ring 202c. The first arc block 202a is formed in the T-shaped tube 2. The outer wall of 01 has a through arc groove 202a-1. A push plate 202b is formed on the first arc block 202a. A central ring 202c is formed on the outer wall of the T-shaped tube 201 and has a positioning hole 202c-1. When the first arc block 202a is inserted into the inner side of the slot 102b, the push plate 202b can drive the ejector 102c into the inner side of the positioning hole 202c-1, so that the position of the T-shaped tube 201 is locked.

[0061] Specifically, the pop-out component 102c includes a pressure ring 102c-1, an action ring 102c-2, a linkage spring 102c-3, and an insert 102c-4. The pressure ring 102c-1 is slidably disposed on the outside of the column 102a, and its outer wall is provided with a protruding pressure block 102c-1a. The action ring 102c-2 is also slidably disposed on the outside of the column 102a, and there is a gap between its sliding track and the sliding track of the pressure ring 102c-1. The linkage spring 102c-3 is sleeved on the column. The outer side of column 102a is positioned between the pressure ring 102c-1 and the actuating ring 102c-2. Insert 102c-4 is positioned on the actuating ring 102c-2, away from the pressure ring 102c-1. As the T-shaped fitting 201 rotates, the first arc block 202a rotates, causing column 102a to enter the inner side of the through arc groove 202a-1, and the push plate 202b begins to press against the pressure block 102c-1. a. This causes the pressure ring 102c-1 to move towards the action ring 102c-2, compressing the linkage spring 102c-3. The linkage spring 102c-3 compresses the action block, causing the action block to move towards the central ring 202c, thereby pushing the insert 102c-4 towards the central ring 202c. When the column 102a reaches the inner end of the penetrating arc groove 202a-1, the insert 102c-4 enters the inner side of the positioning hole 202c-1, at which point the first arc block 202a engages. Inside the slot 102b, the first arc block 202a cannot move away from the tube body 101, so that the T-shaped tube 201 is positioned inside the tube body 101. The insert 102c-4 enters the inside of the positioning hole 202c-1, so that the central ring 202c and the T-shaped tube 201 cannot rotate, thus preventing the first arc block 202a from disengaging from the inside of the slot 102b when the T-shaped tube 201 rotates, thereby achieving the effect of locking the position of the T-shaped tube 201 and the tube body 101.

[0062] Furthermore, a first sliding groove 102a-1 is provided on the outer side of the column 102a, and a first slider is provided on the inner side of the pressure ring 102c-1. The first slider is engaged with the inner side of the first sliding groove 102a-1 and can move within the inner side of the first sliding groove 102a-1. By providing the first sliding groove 102a-1 and the first slider, the pressure ring 102c-1 can be prevented from rotating on the outer side of the column 102a, thereby avoiding the problem of misalignment between the pressure block 102c-1a and the push plate 202b.

[0063] Furthermore, a second sliding groove 102a-2 is provided on the outer side of the column 102a, and a second slider is provided on the inner side of the action ring 102c-2. The second slider is engaged with the inner side of the second sliding groove 102a-2 and can move within the inner side of the second sliding groove 102a-2. There is a gap between one end of the second sliding groove 102a-2 and the first sliding groove 102a-1, and there is also a gap between the other end of the second sliding groove 102a-2 and the end of the column 102a. Through the second sliding groove 102a-2 and the second slider, the problem of the action ring 102c-2 detaching from the column 102a when it is squeezed can be avoided.

[0064] Furthermore, the push plate 202b is an arc-shaped plate, and there are two of them. The number of pressure blocks 102c-1a on the pressure ring 102c-1 is also two. The two push plates 202b are respectively set on both sides of the through arc groove 202a-1. The end of the push plate 202b facing the opening of the through arc groove 202a-1 is provided with an inclined surface 202b-1. The end of the inclined surface 202b-1 near the opening of the through arc groove 202a-1 is in contact with the surface of the first arc block 202a, and the other end is in contact with the upper surface of the push plate 202b. When the column 102a enters the through arc groove 202a-1, the two push plates 202b squeeze the two pressure blocks 102c-1a through their inclined surfaces 202b-1, causing the pressure ring 102c-1 to move upward.

[0065] The rest of the structure is the same as in Example 1.

[0066] Operation process: When the T-shaped fitting 201 is rotated, the first arc block 202a rotates, the column 102a enters the inner side of the through arc groove 202a-1, and the push plate 202b begins to squeeze the pressure block 102c-1a, causing the pressure ring 102c-1 to move towards the action ring 102c-2 and squeeze the linkage spring 102c-3. The linkage spring 102c-3 squeezes the action block, causing the action block to move towards the central ring 202c, thereby pushing the insert 102c-4 towards the central ring 202c. When the column 102a reaches the inner end of the through arc groove 202a-1, Insert 102c-4 enters the inner side of positioning hole 202c-1. At this time, the first arc block 202a is engaged with the inner side of slot 102b, preventing the first arc block 202a from moving away from the tube body 101. This positions the T-shaped tube 201 inside the tube body 101. Insert 102c-4 enters the inner side of positioning hole 202c-1, preventing the central ring 202c and T-shaped tube 201 from rotating. This prevents the first arc block 202a from disengaging from the inner side of slot 102b when the T-shaped tube 201 rotates, thereby achieving the effect of locking the position of the T-shaped tube 201 and the tube body 101.

[0067] Example 3

[0068] Reference Figures 2 to 7 This embodiment differs from the previous embodiments in that: the T-shaped fitting 201 is further provided with an unlocking part 204, which includes an inner extension tube 204a, an outer column 204b, an inner column 204c, and a return spring 204d. The inner extension tube 204a is formed on the T-shaped fitting 201, and its position corresponds to the position of the positioning hole 202c-1. The outer column 204b is slidably connected to the inner side of the inner extension tube 204a. The inner column 204c is fixedly disposed at the end of the outer column 204b away from the T-shaped fitting 201, and its end away from the outer column 204b extends to the outer side of the inner extension tube 204a. The return spring 204d is sleeved on... On the outside of the inner column 204c, its sleeve position is located between the outer column 204b and the end of the inner extension tube 204a away from the T-shaped fitting 201. When it is necessary to unlock the T-shaped fitting 201, a tool is inserted into the inner side of the inner extension tube 204a and squeezes the outer column 204b. After being compressed, the outer column 204b pushes the inner column 204c to move towards the central ring 202c. When the outer column 204b reaches the positioning hole 202c-1, it will continue to squeeze the insert 102c-4, so that the insert 102c-4 is disengaged from the inner side of the positioning hole 202c-1, thereby achieving the unlocking effect and allowing the T-shaped fitting 201 to rotate.

[0069] Specifically, a through hole is provided at the end of the inner tube 204a away from the T-shaped fitting 201. The inner column 204c can pass through the through hole, and the return spring 204d and the outer side of the outer column 204b can also pass through the through hole. When the outer column 204b is pressed, the inner column 204c is pressed and moves from the through hole toward the central ring 202c. The return spring 204d cannot pass through the through hole, and the outer column 204b squeezes the return spring 204d to deform it. After unlocking and rotation are completed, the tool is pulled out, and the elastic force of the return spring 204d pushes the outer column 204b to reset, and the inner column 204c disengages from the inside of the positioning hole 202c-1.

[0070] Furthermore, a retaining ring is installed inside the inner tube 204a. The inner diameter of the retaining ring is smaller than the diameter of the outer cylinder 204b, thereby preventing the spring force of the return spring 204d from popping the outer cylinder 204b out from the inside of the inner tube 204a.

[0071] The rest of the structure is the same as in Example 2.

[0072] Operation process: When it is necessary to unlock the T-shaped fitting 201, the tool is inserted into the inner side of the inner extension tube 204a and the outer column 204b is squeezed. After the outer column 204b is compressed, it pushes the inner column 204c to move towards the central ring 202c. When the outer column 204b reaches the positioning hole 202c-1, it will continue to squeeze the insert 102c-4, so that the insert 102c-4 is disengaged from the inner side of the positioning hole 202c-1, thereby achieving the unlocking effect, so that the T-shaped fitting 201 can be rotated. At this time, rotation can disengage the first arc block 202a from the inner side of the slot 102b, so that the T-shaped fitting 201 can be pulled out from the inner side of the tube body 101.

[0073] Example 4

[0074] Reference Figures 2-8 This embodiment differs from the previous embodiments in that: the semi-exit pushing part includes a housing 103a, an internal spring 103b, a pressing block 103c, and a pushing column 103d. The housing 103a is disposed inside the pipe fitting, and an opening is provided at one end adjacent to the T-shaped pipe fitting 201. The internal spring 103b is disposed inside the housing 103a. The pressing block 103c is slidably disposed inside the housing 103a, and its sidewall is provided with a limiting protrusion 103c-1 extending to the outside of the housing 103a. The pushing column 103d is formed on the side of the pressing block 103c away from the internal spring 103b, and the pushing column 103d is protected by the pipe fitting. When the sleeve 200 is pressed, it can push the extrusion block 103c to press the built-in spring 103b. When the sleeve is inserted into the inner side of the tube body 101, the central ring 202c presses the push column 103d. The push column 103d presses the extrusion block 103c to press the built-in spring 103b. When the T-shaped tube 201 and the tube body 101 are unlocked, the elastic force of the built-in spring 103b pushes the extrusion block 103c and the push column 103d, so that the push column 103d pushes part of the T-shaped tube 201 away from the inner side of the tube body 101, thereby creating a gap between the circular baffle and the end of the tube body 101, which makes it easier to observe the condition of the welded joint.

[0075] Specifically, the detachment part 203 includes a second arc block 203a and a pressing member 203b. The second arc block 203a is formed on the outer wall of the T-shaped tube 201, and the pressing member 203b is formed on one end of the second arc block 203a. A lower inclined surface 203b-1 is provided on the side away from the T-shaped tube 201. When the T-shaped tube 201 extends into the inner side of the tube body 101, the central ring 202c squeezes and causes the pressing block 103c to move. After the extension is completed, the position of the limiting protrusion 103c-1 on the pressing block 103c corresponds to the position of the lower inclined surface 203b-1. At this time, the T-shaped tube 201 is rotated, and the lower inclined surface 203b-1 of the pressing member 203b presses down on the limiting protrusion 103c-1, thereby causing the pressing block 103c to continue to squeeze the built-in spring 103b, so that the pushing column 103d and the central plate are separated, avoiding the pushing column 103d from squeezing the central plate for a long time.

[0076] Furthermore, the arc angles of both the second arc block 203a and the first arc block 202a are 90 degrees. After they are installed on the outside of the T-shaped fitting 201, there is a 90-degree gap between the two ends of the first arc block 202a and the two ends of the second arc block 203a. The included angle between the locking part 102 and the semi-pushing part is set to 180 degrees. When the T-shaped fitting 201 is inserted, the locking part 102 is located at both ends of the first arc block 202a and the second arc block 203a. In one of the gaps of 203a, the semi-pull-out part 103 is located at both ends of the first arc block 202a and in the other gap of the second arc block 203a. When the T-shaped tube 201 is rotated in the first direction (hereinafter referred to as forward rotation), the column 102a enters the inner side of the through arc groove 202a-1 and at the same time the pressing part 203b approaches the extrusion block 103c, thereby positioning the T-shaped tube 201 and pushing the column 103d and the central ring 202c to separate.

[0077] Furthermore, a limiting groove is provided on the side of the housing 103a, which penetrates the side wall of the housing 103a. There are two limiting grooves. There are two limiting protrusions 103c-1 on the outside of the extrusion block 103c. There are also two pressing elements 203b. The two limiting protrusions 103c-1 extend to the outside of the housing 103a through the limiting groove. When rotating, the two pressing elements 203b press the limiting protrusions 103c-1 at the same time, so that the extrusion block 103c moves more smoothly under pressure.

[0078] The rest of the structure is the same as in Example 3.

[0079] Operation process: During the installation of the T-shaped fitting 201, the locking part 102 is positioned at both ends of the first arc block 202a and in one of the gaps of the second arc block 203a, and the semi-extrusion part 103 is positioned at both ends of the first arc block 202a and in the other gap of the second arc block 203a. After insertion, the T-shaped fitting 201 is rotated clockwise, and the column 102a enters the inner side of the penetrating arc groove 202a-1 while the pressing part 203b approaches the extrusion part. When the column 102a reaches the inner end of the through arc groove 202a-1, the pressure block 103c pushes the extrusion block 103c by pressing the lower inclined surface 203b-1 of the pressure block, thereby separating the push column 103d and the central ring 202c. At the same time, the insert 102c-4 enters the inner side of the positioning hole 202c-1, and the position of the T-shaped pipe 201 is fixed, so that the T-shaped pipe 201 protects the welded joint while the central pipe is not squeezed by the push column 103d.

[0080] After unlocking the T-shaped pipe fitting 201 with the unlocking device, rotate the T-shaped pipe fitting 201 in the opposite direction of clockwise rotation. The column 102a disengages from the inside of the through arc groove 202a-1, and at the same time, the pressing block disengages from the extrusion block 103c. The elastic force of the built-in spring 103b pushes the extrusion block 103c, the extrusion block 103c pushes the push column 103d, and the push column 103d pushes the central plate, causing the central plate to move the T-shaped pipe fitting 201 away from the pipe body 101 until half of the T-shaped pipe fitting 201 is exposed, so that a gap appears between the annular baffle and the weld joint of the T-shaped pipe fitting 201, making it easier to observe the weld condition.

[0081] Example 5

[0082] Reference Figure 2 This embodiment differs from the above embodiments in that: a pipe wall protrusion 101a is provided on the inner side of the pipe body 101, and an installation groove 101b is provided at the end of the pipe wall protrusion 101a. The installation positions of the locking part 102 and the half-exit pushing part are located in the installation groove 101b.

[0083] Specifically, the inner diameter of the T-shaped fitting 201 is the same as the minimum inner diameter of the pipe wall protrusion 101a. When the T-shaped fitting 201 contacts the pipe wall protrusion 101a, the T-shaped fitting 201 isolates the internal space of the pipe body 101 from the space of the mounting groove 101b.

[0084] Furthermore, the first arc block 202a and the second arc block 203a are both located at the end of the T-shaped pipe fitting 201 that contacts the pipe wall protrusion 101a. When the T-shaped pipe fitting 201 is in contact with the pipe wall protrusion 101a, the first arc block 202a and the second arc block 203a are both in contact with the pipe wall protrusion 101a. The thickness of the first arc block 202a is adapted to the groove width of the slot 102b, so that after installation, the first arc block 202a will not wobble inside the slot 102b.

[0085] Furthermore, the outer walls of the first arc block 202a and the second arc block 203a are fitted to the side wall of the mounting groove 101b, which is an annular groove formed on the protrusion 101a of the pipe wall.

[0086] The rest of the structure is the same as in Example 4.

[0087] Operation process: When the T-shaped fitting 201 is inserted into the inner side of the mounting groove 101b, the outer walls of the first arc block 202a and the second arc block 203a are in contact with the side wall of the mounting groove 101b to prevent the T-shaped fitting 201 from shaking. When the T-shaped fitting 201 is in contact with the pipe wall protrusion 101a, both the first arc block 202a and the second arc block 203a are in contact with the pipe wall protrusion 101a. The T-shaped fitting 201 isolates the internal space of the pipe body 101 from the space of the mounting groove 101b.

[0088] Example 6

[0089] Reference Figure 2 , Figure 3 , Figures 9 to 11 This embodiment differs from the above embodiments in that it also discloses a heat exchanger tube sheet used in conjunction with a heat exchanger tube having a welding protection structure in the above embodiments. The tube sheet includes a plate body 301, an installation hole 302 on the plate body 301, and a welding groove 303 on the plate body 301 at the end of the installation hole 302. The welding groove 303 is connected to the installation hole 302. When the tube is fitted in, the tube and the plate body 301 are welded at the welding groove 303, so that the weld joint is inside the welding groove 303 without protrusion. After the T-shaped tube 201 is installed, it completely covers the welding groove 303 to prevent the fluid from eroding the weld.

[0090] Specifically, the pipe wall protrusion 101a has a first sealing groove 101c inside the mounting groove 101b. The end of the T-shaped pipe fitting 201 is provided with a first sealing ring 201a corresponding to the position of the first sealing groove 101c. A second sealing groove 304 is provided on one side of the plate body 301 at the corresponding position of the mounting hole 302. A second sealing ring 201b is provided on the T-shaped pipe fitting 201 in the second sealing groove 304. After installation, the first sealing ring 201a enters the inside of the first sealing groove 101c, and the second sealing ring 201b enters the inside of the second sealing groove 304, thereby minimizing the contact between the fluid and the weld joint.

[0091] Furthermore, the welding groove 303 is circular, so that there is a closed welding joint between the tube body 101 and the plate body 301, and the second sealing groove 304 and the second sealing ring 201b surround the welding groove 303 on its inner side.

[0092] The rest of the structure is the same as in Example 5.

[0093] Operation process: After the pipe fitting is inserted, the pipe fitting and the plate 301 are welded at the welding groove 303, so that the weld joint is inside the welding groove 303 without any protrusion. After the T-shaped pipe fitting 201 is installed, it completely covers the welding groove 303 to prevent the fluid from scouring the weld. The first sealing ring 201a enters the inside of the first sealing groove 101c, and the second sealing ring 201b enters the inside of the second sealing groove 304, thereby minimizing the contact between the fluid and the weld joint.

[0094] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0095] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0096] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0097] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A heat exchange tube with a weld protection structure, characterized in that: include, The main tube (100) includes a tube body (101) and a locking part (102) and a semi-extension part (103) disposed inside the tube body (101). The protective sleeve (200) includes a detachable T-shaped fitting (201) disposed at the end of the tube body (101), a connecting part (202) disposed on the outer side wall of the T-shaped fitting (201), and a detaching part (203). The tube body (101) and the heat exchanger tube sheet are connected by welding. After welding, one end of the T-shaped fitting (201) is inserted into the inside of the tube body (101). When the T-shaped fitting (201) rotates at the end of the pipe body (101), the connecting part (202) can drive the locking part (102) to lock the T-shaped fitting (201) to the pipe body (101), and the disengaging part (203) can drive the semi-extrusion part (103) to separate from the T-shaped fitting (201); The locking part (102) includes a column (102a) and a pop-out part (102c). The column (102a) is formed inside the tube (101), and a slot (102b) is provided at one end near the tube (101). The pop-out part (102c) is slidably connected to the outside of the column (102a). The semi-ejection part (103) includes a housing (103a), an internal spring (103b), a pressing block (103c), and a pushing column (103d). The sleeve (103a) is disposed on the inner side of the pipe fitting, and an opening is provided at one end of it adjacent to the T-shaped pipe fitting (201); The built-in spring (103b) is located on the inside of the housing (103a); The extrusion block (103c) is slidably disposed on the inner side of the housing (103a), and its sidewall is provided with a limiting protrusion (103c-1) extending to the outer side of the housing (103a). The push column (103d) is fixedly disposed on the side of the extrusion block (103c) away from the built-in spring (103b); when the push column (103d) is pressed by the protective sleeve (200), it can push the extrusion block (103c) to press the built-in spring (103b). The T-shaped fitting (201) is made of zinc-based or aluminum-based alloy and provides cathodic protection for the heat exchange tube, heat exchanger tube sheet, and the welds of both.

2. The heat exchanger tube with a weld protection structure as described in claim 1, characterized in that: The ejector (102c) includes a pressure ring (102c-1), an action ring (102c-2), a linkage spring (102c-3), and an insert (102c-4). The pressure ring (102c-1) is slidably disposed on the outside of the column (102a), and its outer side wall is provided with a protruding pressure block (102c-1a). The working ring (102c-2) is also slidably disposed on the outside of the column (102a), and there is a gap between its sliding track and the sliding track of the pressure ring (102c-1); The linkage spring (102c-3) is sleeved on the outside of the column (102a), and its sleeve position is located between the pressure ring (102c-1) and the action ring (102c-2); The insert (102c-4) is disposed on the action ring (102c-2), and its position is located on the side of the action ring (102c-2) away from the pressure ring (102c-1).

3. The heat exchange tube with a weld protection structure as described in claim 2, characterized in that: The connecting part (202) includes a first arc block (202a), a push plate (202b), and a central ring (202c); The first arc block (202a) is disposed on the outer side wall of the T-shaped pipe fitting (201), and a through arc groove (202a-1) is provided thereon. The push plate (202b) is formed on the first arc block (202a). When the first arc block (202a) rotates, the push plate (202b) can push the pressure ring (102c-1) to slide towards the action ring (102c-2). The central ring (202c) is disposed on the outer side wall of the T-shaped pipe fitting (201), and a positioning hole (202c-1) is provided thereon. When the first arc block (202a) is inserted into the slot (102b), the push plate (202b) can drive the action ring (102c-2) to push the insert (102c-4) into the inside of the positioning hole (202c-1).

4. The heat exchanger tube with a weld protection structure as described in claim 3, characterized in that: The detachment part (203) includes a second arc block (203a) and a pressing member (203b). The second arc block (203a) is disposed on the outer wall of the T-shaped tube (201). The pressing member (203b) is formed on one end of the second arc block (203a), and a lower inclined surface (203b-1) is provided on the side away from the T-shaped tube (201).

5. The heat exchanger tube with a weld protection structure as described in claim 4, characterized in that: The T-shaped tube fitting (201) is also provided with an unlocking part (204), which includes an inner extension tube (204a), an outer column (204b), an inner column (204c), and a return spring (204d). The inner tube (204a) is formed on the T-shaped tube (201), and its position corresponds to the position of the positioning hole (202c-1); The outer column (204b) is slidably connected to the inner side of the inner tube (204a); The inner column (204c) is fixedly disposed at the end of the outer column (204b) away from the T-shaped fitting (201), and the end of the inner column (204b) away from the outer column (204b) extends to the outside of the inner extension tube (204a); The return spring (204d) is sleeved on the outside of the inner column (204c), and its sleeve position is located between the outer column (204b) and the end of the inner extension tube (204a) away from the T-shaped tube (201).

6. The heat exchanger tube with a weld protection structure as described in claim 5, characterized in that: The inner side of the tube body (101) is provided with a tube wall protrusion (101a), and the end of the tube wall protrusion (101a) is provided with an installation groove (101b). The installation positions of the locking part (102) and the semi-pull-out part (103) are located in the installation groove (101b).

7. The heat exchanger tube with a weld protection structure as described in claim 6, characterized in that: The heat exchanger tube sheet includes a plate body (301), on which mounting holes (302) are provided, and on which welding grooves (303) are provided at the ends of the mounting holes (302).

8. The heat exchanger tube with a weld protection structure as described in claim 7, characterized in that: The pipe wall protrusion (101a) has a first sealing groove (101c) inside the mounting groove (101b). The end of the T-shaped pipe fitting (201) is provided with a first sealing ring (201a) corresponding to the position of the first sealing groove (101c). A second sealing groove (304) is provided on one side of the plate (301) at the corresponding position of the mounting hole (302). A second sealing ring (201b) is provided on the T-shaped pipe fitting (201) and in the second sealing groove (304).

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