A guiding device for the perforation of low-temperature economizer heat exchange tubes of a power plant boiler

Abstract

The utility model belongs to the technical field of power station boiler, especially relates to a kind of guiding device for the perforation of low-low temperature coal economizer heat exchange tube of power station boiler.The expansion block on sleeve can pass through mounting hole from the side of support plate far from heat exchange tube, and is inserted into the end to be inserted of heat exchange tube, by screwing nut, the extruding end of pull rod is close to sleeve, the movable end of expansion block is extruded, moves in the direction of axis far from sleeve and tightly sticks to the inner wall of heat exchange tube, so that the guiding device is fixed with heat exchange tube, the end to be inserted of heat exchange tube is aligned with mounting hole, by multiple guiding device, the end to be inserted of multiple heat exchange tubes of same row is aligned with corresponding mounting hole on support plate, then support plate is moved in the direction of heat exchange tube, the end to be inserted of heat exchange tube is guided by the guiding device, so that the end to be inserted of heat exchange tube of same row is easily and quickly passed through mounting hole on support plate, to complete the perforation work of heat exchange tube, so as to improve perforation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of power plant boiler technology, and specifically relates to a guide device for perforating heat exchange tubes in low-temperature economizers of power plant boilers. Background Technology

[0002] With the tight supply of coal for power generation and the increasingly severe situation of energy consumption in my country, the country has imposed stricter requirements on energy conservation and emission reduction in thermal power plants.

[0003] To meet the requirements of energy conservation and consumption reduction, low-temperature economizers are installed at both the air preheater outlet and the electrostatic precipitator inlet. The low-temperature economizers can effectively reduce the flue gas temperature and recover waste heat from the flue gas, resulting in excellent energy-saving benefits. At the same time, they improve the operating efficiency of the electrostatic precipitator, thus achieving the goal of energy conservation and consumption reduction.

[0004] Low-temperature economizers generally adopt a box-type design, which is as follows: multiple heat exchange tubes are inserted at both ends onto two support plates to form a box-type structure, and the two support plates are used to support and fix the multiple heat exchange tubes. However, heat exchange tubes have a certain rigidity and cannot be bent when piercing. When piercing heat exchange tubes, workers usually insert one end of multiple heat exchange tubes into multiple mounting holes on a support plate, and the multiple heat exchange tubes are arranged in an array on the support plate. Then, another support plate is erected, and the other ends of all the heat exchange tubes in the same row of the array are inserted into the multiple mounting holes on the erected support plate. Only then can the erected support plate be moved (moving the erected mounting plate closer to the other mounting plate), and the perforation work of the multiple heat exchange tubes in the next row be carried out. This process is repeated until both ends of all the heat exchange tubes in the array are inserted into the multiple mounting holes on the two support plates.

[0005] During the perforation process, the other ends of multiple heat exchange tubes are affected by gravity or other factors, making it difficult to align them simultaneously with the corresponding mounting holes on the support plate. Workers need to manually align them one by one before the other end of the heat exchange tubes can be perforated, making the entire perforation process time-consuming and labor-intensive, resulting in a significant reduction in perforation efficiency. Utility Model Content

[0006] This utility model provides a guiding device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler. It solves the technical problem in the prior art that it is difficult to align the other ends of multiple heat exchange tubes with the corresponding mounting holes on the support plate at the same time. This requires workers to manually align them one by one before perforating the other end of the heat exchange tubes, which leads to a significant reduction in tube perforation efficiency.

[0007] This utility model is achieved through the following technical solution: A guide device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler includes a tie rod, an expansion block, a sleeve, and a nut; The number of expansion blocks is at least two, all of which are placed horizontally at one end of the sleeve. The fixed end of the expansion block is connected to the sleeve, and all the expansion blocks are arranged at equal intervals around the axis of the sleeve. The locking end of the pull rod passes through the ring and sleeve formed by all the expansion blocks in sequence and is then threaded into the nut. The distance between the side of the expansion block and the axis of the sleeve at the pressing end of the pull rod is greater than the distance between the side of the expansion block facing the axis of the sleeve and the axis of the sleeve. By tightening the nut, the pressing end of the pull rod moves closer to the sleeve and the moving end of the expansion block is pressed away from the axis of the sleeve.

[0008] To better realize this utility model, the above structure is further optimized, and the pull rod includes a pressing part and a connecting part; The extrusion section has a frustum-shaped structure; The connecting part is a cylindrical structure, and the diameter of the connecting part matches the diameter of the small end of the extrusion part. One end of the connecting part is coaxial and fixedly disposed at the small end of the extrusion part; the outer wall of the connecting part is provided with external threads for threaded connection with the nut.

[0009] To better realize this utility model, the above structure is further optimized, and the distance between the side of the expansion block facing the axis of the sleeve and the axis of the sleeve is equal to the radius of the connecting part.

[0010] To better realize this utility model, the above structure is further optimized. The side of the expansion block facing the axis of the sleeve is provided with a guide surface to facilitate the extrusion part to extrude the expansion block in a direction away from the axis of the sleeve.

[0011] To better realize this utility model, the above structure is further optimized, and the distance between the side of the expansion block away from the axis of the sleeve and the axis of the sleeve is less than or equal to the inner diameter of the heat exchange tube.

[0012] To better realize this utility model, the above structure is further optimized. The sleeve is a circular tubular structure, and the outer diameter of the sleeve is greater than or equal to the outer diameter of the heat exchange tube.

[0013] Compared with the prior art, this utility model has the following advantages: In the guiding device provided by this utility model, the expansion block set on the sleeve can pass through the mounting hole from the side of the support plate away from the heat exchange tube and be inserted into the end of the heat exchange tube corresponding to the mounting hole. By tightening the nut, the pressing end of the pull rod moves closer to the sleeve, and the movable end of the expansion block is pressed, moving away from the axis of the sleeve and closely adhering to the inner wall of the heat exchange tube, thus fixing the guiding device to the heat exchange tube and aligning the end of the heat exchange tube to be inserted with the mounting hole. By using multiple guiding devices, the ends of multiple heat exchange tubes in the same row are aligned with the corresponding mounting holes on the support plate. Then, the support plate is moved towards the direction of the heat exchange tube, and the guiding device guides the ends of the heat exchange tubes to be inserted, allowing the ends of the heat exchange tubes in the same row to pass through the mounting holes on the support plate easily and quickly, thereby completing the piercing work of the heat exchange tubes and improving the piercing efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a guide device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler, according to this utility model.

[0016] Figure 2 This is a schematic diagram of the connection between the sleeve and the expansion block in a guiding device for perforating the heat exchange tube of a low-temperature economizer in a power plant boiler, according to this utility model.

[0017] Figure 3 This is a front view of the sleeve with an expansion block at one end in a guide device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler, according to this utility model.

[0018] Figure 4 This is a schematic diagram of the tie rod in a guide device for perforating heat exchange tubes of a low-temperature economizer in a power plant boiler, according to this utility model.

[0019] Figure 5 This is a schematic diagram of the structure of a guide device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler, as described in this utility model.

[0020] In the picture: 1. Tie rod; 11. Connecting part; 12. Extrusion part; 2. Increased block; 21. Guide surface; 3. Sleeve; 4. Nuts; 5. Heat exchanger tubes; 6. Support plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In the embodiments of this application, such as Figures 1 to 5 As shown, this guiding device can be used for perforating the heat exchange tube 5 of the low-temperature economizer in a power plant boiler, and can also be used for perforating heat exchange tubes in heat exchangers of the same structure; the guiding device includes a pull rod 1, an expansion block 2, a sleeve 3, and a nut 4; wherein, The number of expansion blocks 2 is at least two, and all expansion blocks 2 are horizontally placed at one end of the sleeve 3. The fixed end of the expansion block 2 is connected to the sleeve 3, and all expansion blocks 2 are arranged at equal intervals around the axis of the sleeve 3; see [link to other documentation]. Figure 2 and Figure 3 In this embodiment, there are four expansion blocks 2. The four expansion blocks 2 are arranged at equal intervals around the axis of the sleeve 3. In the initial state, the two sides of the four expansion blocks 2 are in contact with each other to form a circular tubular structure with an annular cross-sectional shape. The locking end of the pull rod 1 passes sequentially through the ring formed by all the expansion blocks 2 and the sleeve 3, and is then threadedly connected to the nut 4; the distance between the side of the pull rod 1 corresponding to the expansion block 2 and the axis of the sleeve 3 is greater than the distance between the side of the expansion block 2 facing the axis of the sleeve 3 and the axis of the sleeve 3. See [reference needed]. Figure 1 ; By tightening the nut 4, the pressing end of the pull rod 1 is brought closer to the sleeve 3, and the movable end of the expansion block 2 is pressed away from the axis of the sleeve 3.

[0025] Before performing the perforation work (the process of inserting the end of the heat exchange tube into the mounting hole), the staff can first perform preparatory work, as follows: Workers insert one end of multiple heat exchange tubes 5 into mounting holes on a support plate 6 on the installation platform. The multiple heat exchange tubes 5 are arranged in an array on the support plate 6. There are Y mounting holes along the vertical direction of the support plate 6 and Z mounting holes along the horizontal direction of the support plate 6. That is, Y heat exchange tubes 5 can be installed along the vertical direction of the support plate 6 and Z heat exchange tubes 5 can be installed along the horizontal direction of the support plate 6. A total of Y×Z heat exchange tubes 5 can be installed, where Y and Z are both natural numbers greater than or equal to 4.

[0026] After completing the preparations, the worker can place another support plate 6 on the installation platform, positioning it at the insertion end of the heat exchange tube 5, and fix it at an angle. This fixing can be done manually or using other clamping devices; the goal is to ensure the position of the support plate 6 remains unchanged. The angle of inclination of the support plate 6 should be ≤2.5°. (See [reference]). Figure 5 It is worth noting that, Figure 5 To better demonstrate the perforation process of heat exchanger tube 5, the angle of support plate 6 is greater than the aforementioned tilt angle, i.e. Figure 5 The angle of the support plate 6 shown is greater than 2.5°. In the actual perforation process, the heat exchange tube 5 should be perforated according to the above-mentioned tilt angle. The expansion block 2 in the guide device is inserted into the end of the heat exchange tube 5 after passing through the mounting hole of the support plate 6. Specifically, the expansion block 2, which is set on the sleeve 3 in the guide device, passes through the mounting hole from the side of the support plate 6 away from the heat exchange tube 5 and is inserted into the end of the heat exchange tube 5 corresponding to the mounting hole. By turning the nut 4, the pressing end of the pull rod 1 moves closer to the sleeve 3, and the movable end of the expansion block 2 is pressed and moves away from the axis of the sleeve 3 and close to the inner wall of the heat exchange tube 5, so that the guide device is fixed to the heat exchange tube 5. In the same way, multiple guide devices are fixed one by one to the end of the bottom heat exchange tube 5. At this time, it is equivalent to extending the end of the heat exchange tube 5 to be inserted and placing it in the mounting hole of the support plate 6. Subsequently, the support plate 6 is moved in the direction of the heat exchange tube 5 (without changing the tilt angle). This guiding device guides the insertion end of the heat exchange tube 5, allowing the insertion ends of the heat exchange tubes 5 in the same row to easily pass through the mounting holes on the support plate 6, until the insertion ends of the heat exchange tubes 5 in the second layer approach the support plate 6. (See [reference]). Figure 5 ; Next, remove all the guide devices on the bottom heat exchange tube 5 and install them into the insertion end of the second heat exchange tube 5 according to the above installation method. Repeat the above steps until all the insertion ends of the heat exchange tubes 5 are inserted into the mounting holes on the support plate 6. Adjust the two support plates 6 into position according to the dimensions in the drawing, and the heat exchange tube 5 perforation work is completed.

[0027] In some embodiments, the pull rod 1 described above includes a pressing part 12 and a connecting part 11, see [link to previous document]. Figure 4 ; The extrusion section 12 has a frustum-shaped structure, that is, the cross-sectional shape of the extrusion section 12 is circular and the longitudinal cross-section is an isosceles trapezoid. The connecting part 11 has a cylindrical structure, and the diameter of the connecting part 11 matches the diameter of the small end of the extrusion part 12. One end of the connecting part 11 is coaxially and fixedly disposed at the small end of the extrusion part 12. The outer wall of the connecting part 11 is provided with an external thread for threaded connection with the nut 4.

[0028] During the installation of the guide device (installed on the heat exchange tube 5), the operator needs to tighten the nut 4. At this time, the connecting part 11 will drive the pressing part 12 to move towards the position of the sleeve 3. The inclined surface of the pressing part 12 will press the movable end of the expansion block 2 away from the axis of the sleeve 3, so that the side of the expansion block 2 away from the axis of the sleeve 3 is tightly attached to the inner wall of the heat exchange tube 5, thereby fixing the guide device to the heat exchange tube 5.

[0029] In some embodiments, the distance between the side of the expansion block 2 facing the axis of the sleeve 3 and the axis of the sleeve 3 is equal to the radius of the connecting part 11. When the extrusion part 12 does not contact the expansion block 2, the movement of the connecting part 11 will not touch the expansion block 2. That is, the movement of the connecting part 11 will not extrude the expansion block 2 away from the axis of the sleeve 3, thus avoiding the situation where the guide device gets stuck in the heat exchange tube 5 and cannot be removed due to misoperation, so as to make the installation and disassembly of the guide device more convenient.

[0030] In some embodiments, the side of the expansion block 2 facing the axis of the sleeve 3 is provided with a guide surface 21 to facilitate the pressing part 12 pressing the expansion block 2 in a direction away from the axis of the sleeve 3. See [link to documentation]. Figure 2 and Figure 3 This is to make the cooperation between the extrusion section 12 and the expansion block 2 smoother.

[0031] It should be noted that the guide surface 21 mentioned above is an inclined surface. The distance between the end of the guide surface 21 away from the sleeve 3 and the axis of the sleeve 3 is greater than the distance between the end of the guide surface 21 near the sleeve 3 and the axis of the sleeve 3. It slopes smoothly from the end of the expansion block 2 away from the sleeve 3 to the end of the expansion block 2 near the sleeve 3. See [reference needed]. Figure 2 ; When the extrusion part 12 moves toward the sleeve 3, the inclined surface of the extrusion part 12 cooperates with the guide surface 21 of the expansion block 2, which can easily extrude the expansion block 2 away from the axis of the sleeve 3, thus completing the installation of the guide device.

[0032] In some embodiments, the distance between the side of the expansion block 2 facing away from the axis of the sleeve 3 and the axis of the sleeve 3 is less than or equal to the inner diameter of the heat exchange tube 5. See [reference needed]. Figure 5 This allows the expansion block 2 to be easily inserted into the heat exchange tube 5, making the installation of the guide device more convenient.

[0033] In some embodiments, the sleeve 3 described above is a circular tubular structure, see [reference needed]. Figure 3 and Figure 5 The outer diameter of sleeve 3 is greater than or equal to the outer diameter of heat exchange tube 5; When the outer diameter of the sleeve 3 is greater than or equal to the outer diameter of the heat exchange tube 5, it can guide the end of the heat exchange tube 5 to be inserted.

[0034] Preferably, the outer diameter of the sleeve 3 is equal to the outer diameter of the heat exchange tube 5. In this case, when the sleeve 3 is inserted into the mounting hole of the support plate 6, the sleeve 3 will not wobble in the mounting hole, thus better guiding the end of the heat exchange tube 5 to be inserted, making the tube insertion work of the heat exchange tube 5 easier, and preventing the sleeve 3 from slipping into the heat exchange tube 5 during the installation of the guide device, which would affect the installation efficiency of the guide device.

[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A guiding device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler, characterized in that: Includes a tie rod (1), a expansion block (2), a sleeve (3), and a nut (4); The number of expansion blocks (2) is at least two. All expansion blocks (2) are placed horizontally at one end of the sleeve (3). The fixed end of the expansion block (2) is connected to the sleeve (3), and all expansion blocks (2) are arranged at equal intervals around the axis of the sleeve (3). The locking end of the pull rod (1) passes through the ring formed by all the expansion blocks (2) and the sleeve (3) in sequence and is then threadedly connected to the nut (4); the distance between the pressing end of the pull rod (1) and the side of the expansion block (2) and the axis of the sleeve (3) is greater than the distance between the side of the expansion block (2) facing the axis of the sleeve (3) and the axis of the sleeve (3); by turning the nut (4), the pressing end of the pull rod (1) is brought closer to the sleeve (3), and the movable end of the expansion block (2) is pressed away from the axis of the sleeve (3).

2. The guiding device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler according to claim 1, characterized in that: The pull rod (1) includes a pressing part (12) and a connecting part (11). The extrusion section (12) has a frustum-shaped structure; The connecting part (11) is a cylindrical structure. The diameter of the connecting part (11) matches the diameter of the small end of the extrusion part (12). One end of the connecting part (11) is coaxial and fixedly disposed at the small end of the extrusion part (12). The outer wall of the connecting part (11) is provided with an external thread for threaded connection with the nut (4).

3. The guiding device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler according to claim 2, characterized in that: The distance between the side of the expansion block (2) facing the axis of the sleeve (3) and the axis of the sleeve (3) is equal to the radius of the connecting part (11).

4. The guiding device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler according to claim 2, characterized in that: The expansion block (2) is provided with a guide surface (21) on the side facing the axis of the sleeve (3) to facilitate the extrusion part (12) to extrude the expansion block (2) in a direction away from the axis of the sleeve (3).

5. The guiding device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler according to claim 1, characterized in that: The distance between the side of the expansion block (2) away from the axis of the sleeve (3) and the axis of the sleeve (3) is less than or equal to the inner diameter of the heat exchange tube (5).

6. The guiding device for perforating heat exchange tubes in a low-temperature economizer of a power plant boiler according to claim 1, characterized in that: The sleeve (3) is a circular tubular structure, and the outer diameter of the sleeve (3) is greater than or equal to the outer diameter of the heat exchange tube (5).

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