Tube drawing device for U-shaped tube heat exchanger
Through the combination of sliding lead screw and mechanical expansion pipe, the problem of difficulty in penetrating the U-shaped heat exchange pipe is solved, efficient and safe penetration operation is achieved, and production efficiency is improved.
Patent Information
- Application Number
- CN202420935763.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-30
AI Technical Summary
In the manufacturing process of U-shaped heat exchanger tube bundles, the U-shaped heat exchange tube has a U-shaped structure with a large bending radius and a short length of the front end protruding pipe plate, resulting in large resistance to pipe penetration and difficulty in pipe penetration, which affects working efficiency.
A U-shaped tube heat exchanger tube extraction device including a sliding lead screw and a mechanical expansion tube is designed. The U-shaped heat exchanger tube is fixed by using a positioning column and a limiting table through the hexagonal lead screw of the sliding lead screw and the electric wrench. The mechanical expansion tube is used to tighten and fix the pipe head through the expansion rod and expansion sleeve, and the U-shaped heat exchange tube is pulled out from the pipe plate through the reciprocating movement of the screw nut and the U-shaped groove.
The pipe penetration work can be completed without damaging the quality of the U-shaped heat exchange pipe, saving time and effort, convenient use, safe operation, convenient and efficient, and improved production efficiency.
Smart Images
Figure CN222288606U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchanger assembly and manufacturing, in particular to a U-tube heat exchanger tube pulling device. Background Art
[0002] When manufacturing the tube bundle of the U-tube heat exchanger, the U-shaped heat exchange tube needs to pass through the tube holes of the baffle and the tube holes of the tube sheet. During the tube insertion process, since the tube hole diameter of the tube sheet is inconsistent with the tube hole diameter of the baffle, that is, the tube hole center line of the tube sheet and the tube hole center line of the baffle cannot completely coincide, the tube hole diameter of the tube sheet is generally smaller than the tube hole diameter of the baffle, and the requirements for the U-shaped heat exchange tube insertion are more stringent.
[0003] When threading a U-shaped heat exchange tube, when the U-shaped heat exchange tube passes through the tube hole of the baffle and needs to pass through the tube sheet, there is often a large threading resistance and difficulty in threading. Since the rear end of the U-shaped heat exchange tube is a U-shaped structure, when the bending radius of the U-shaped heat exchange tube becomes larger and larger, the rear end of the U-shaped heat exchange tube is arc-shaped, and it is impossible to directly apply force to the rear end of the U-shaped heat exchange tube for threading. The length of the front end of the U-shaped heat exchange tube extending out of the tube sheet is extremely short, and most of them do not even extend out of the tube sheet, so it is impossible to effectively fix and pull the U-shaped heat exchange tube from the front end, resulting in difficulty in threading and low efficiency, affecting work efficiency. Summary of the invention
[0004] In order to solve the problems in the existing U-shaped heat exchange tube threading process, in which the rear end of the U-shaped heat exchange tube cannot be forced for threading, the front end cannot be effectively fixed and pulled to pull the U-shaped heat exchange tube, resulting in large threading resistance, difficulty in threading, and affected work efficiency, the utility model provides a U-shaped tube heat exchanger tube pulling device.
[0005] The utility model provides a U-tube heat exchanger tube pulling device, comprising a sliding screw, the sliding screw comprising a hexagonal screw, the front end of the hexagonal screw is provided with a positioning column extending into the tube plate hole through a limiting platform with a diameter larger than the tube plate hole, the positioning column, the limiting platform and the hexagonal screw are coaxially fixed, a screw nut is rotatably installed on the hexagonal screw, and a U-shaped groove which is matched with a mechanical expansion tube clamping is welded on the outer side of the screw nut; the mechanical expansion tube comprises an expansion rod, an expansion sleeve is sleeved on the outer side of the expansion rod, an expansion depth limiting sleeve is fixed on the rear end of the expansion sleeve through a positioning screw ring sleeve, the U-shaped groove is sleeved on the expansion sleeve, and the U-shaped groove is located at the front end of the expansion depth limiting sleeve.
[0006] During implementation, it includes a sliding screw, which includes a hexagonal screw. The tail end of the hexagonal screw cooperates with an electric wrench, and the hexagonal screw is driven to rotate by the electric wrench. The front end of the hexagonal screw is installed with a positioning column extending into the tube sheet hole through a limit table with a diameter larger than the tube sheet hole. When the positioning column is inserted into the tube sheet hole, the limit table abuts against the tube sheet. The positioning column, the limit table and the hexagonal screw are coaxially fixed. A screw nut is rotatably installed on the hexagonal screw, and the screw nut is on the hexagonal screw. The nut rotates and reciprocates along the axis. A U-shaped groove is welded on the outside of the lead screw nut for clamping with the mechanical expansion tube. The outside of the U-shaped groove is welded on the outer surface of the lead screw nut. The positioning column is inserted into the tube sheet hole adjacent to the U-shaped heat exchange tube for mechanical expansion tube extraction, that is, the mechanical expansion tube is inserted into the U-shaped heat exchange tube and fixed, and the sliding lead screw is inserted into the adjacent tube sheet hole (the tube sheet hole without the U-shaped heat exchange tube inserted). The rotation of the hexagonal lead screw drives the mechanical expansion tube to move linearly to pull the U-shaped heat exchange tube out of the tube sheet.
[0007] The mechanical expansion tube can be detachably installed in the U-shaped heat exchange tube. The mechanical expansion tube includes an expansion rod, an expansion sleeve is sleeved on the outer surface of the expansion rod, and the rear end of the expansion sleeve is fixed with an expansion depth limiting sleeve through a positioning screw ring sleeve. A head nut is provided on the top of the expansion rod, and expansion beads and expansion sleeves that cooperate with each other are provided on the expansion rod, that is, an expansion bead groove is provided at the front end of the expansion sleeve, and the expansion bead is installed in the expansion bead groove of the expansion sleeve. The expansion tube assembly is a prior art and will not be described in detail here. A hexagonal head for expansion tube is integrally fixed to the tail of the expansion rod, which is used for the installation of the mechanical expansion tube and the U-shaped heat exchange tube. The U-shaped groove is clamped on the expansion sleeve, and the U-shaped groove reciprocates along the axial direction with the screw nut when the hexagonal head screw rotates. The U-shaped groove is located at the front end of the expansion depth limiting sleeve, and the edge of the U-shaped groove is against the side of the expansion depth limiting sleeve.
[0008] When in use, first extend the mechanical expansion rod through the tube sheet hole into the tube head of the U-shaped heat exchange tube, rotate the hexagonal head of the expansion tube, so that the expansion bead, the expansion rod and the tube head of the U-shaped heat exchange tube are expanded and fixed, insert the positioning column at the front end of the sliding screw into the tube sheet hole adjacent to the U-shaped heat exchange tube, and clamp the U-shaped groove on the expansion sleeve at the front end of the expansion depth limit sleeve, assemble an electric wrench at the tail of the hexagonal screw, drive the sliding screw to rotate through the electric wrench, and under the push of the expansion depth limit sleeve, the screw nut and the U-shaped groove reciprocate along the axis of the hexagonal screw, and the mechanical expansion tube pulls the U-shaped heat exchange tube outward.
[0009] Compared with the prior art, the utility model has the following beneficial effects:
[0010] The utility model provides a U-tube heat exchanger tube pulling device, which completes the tube pulling by using a handheld electric wrench, and can complete the U-tube pulling work without taking any action that damages the quality of the U-tube (such as knocking the tail of the U-tube). The utility model saves time and effort, is easy to use, safe to operate, convenient and efficient. The device has a simple structure and is easy to manufacture, which saves product equipment to the greatest extent and is beneficial to enterprise production. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural schematic diagram of the utility model.
[0012] Figure 2 It is a structural schematic diagram of the mechanical expansion tube in the utility model.
[0013] Figure 3 It is a structural schematic diagram of the sliding screw in the utility model.
[0014] The following are marked in the figure:
[0015] 1-mechanical expansion tube, 11-head nut, 12-expansion rod, 13-expansion ball, 14-expansion sleeve, 15-expansion depth limit sleeve, 16-positioning screw, 17-expansion tube hexagonal head; 2-sliding screw, 21-positioning column, 22-limiting platform, 23-hexagonal head screw, 24-screw nut, 25-U-shaped groove. DETAILED DESCRIPTION
[0016] The specific embodiments of the present utility model are described below in conjunction with the accompanying drawings.
[0017] A U-tube heat exchanger tube removal device, such as Figures 1 to 3 As shown: including a sliding screw 2, such as Figure 3 As shown: the sliding screw 2 includes a hexagonal screw 23, the tail end of the hexagonal screw 23 cooperates with an electric wrench, and the hexagonal screw 23 is driven to rotate by the electric wrench. The front end of the hexagonal screw 23 is installed with a positioning column 21 extending into the tube plate hole through a limiting platform 22 with a diameter larger than the tube plate hole. When the positioning column 21 is inserted into the U-shaped heat exchange tube, the limiting platform abuts against the tube head of the U-shaped heat exchange tube. The positioning column 21 and the limiting platform 22 are coaxially fixed with the hexagonal screw 23. A screw nut 24 is rotatably installed on the hexagonal screw 23, and the screw nut 24 is fixed on the hexagonal screw The head lead screw 23 rotates and reciprocates along the axis, the outer side of the lead screw nut 24 is welded with a U-shaped groove 25 that is clamped and matched with the mechanical expansion tube 1, and the outer side of the U-shaped groove 25 is welded to the outer surface of the lead screw nut 24; the positioning column 21 is inserted into the tube sheet hole adjacent to the U-shaped heat exchange tube pulled out by the mechanical expansion tube 1, that is, the mechanical expansion tube 1 is inserted into the U-shaped heat exchange tube and fixed, and the sliding lead screw 2 is inserted into the adjacent tube sheet hole (the tube sheet hole without the U-shaped heat exchange tube inserted), and the hexagonal head lead screw 23 rotates to drive the mechanical expansion tube 1 to move linearly to pull the U-shaped heat exchange tube out of the tube sheet.
[0018] like Figure 2As shown: the mechanical expansion tube 1 can be detachably installed in the U-shaped heat exchange tube, the mechanical expansion tube 1 comprises an expansion rod 12, the expansion rod 12 is sheathed with an expansion sleeve 14, the rear end of the expansion sleeve 14 is fixed with an expansion depth limit sleeve 15 by a positioning screw 16, the top end of the expansion rod 12 is provided with a head nut 11, the expansion rod 12 is provided with an expansion bead 13 and an expansion sleeve 14 that cooperate with each other, that is, the front end of the expansion sleeve 14 is provided with an expansion bead groove, and the expansion bead 13 is installed in the expansion bead groove of the expansion sleeve 14 The expansion tube assembly is a prior art and will not be described in detail here. The tail of the expansion rod 12 is integrally fixed with an expansion tube hexagonal head 17, which is used for the installation of the mechanical expansion tube 1 and the U-shaped heat exchange tube. The U-shaped groove 25 is clamped on the expansion sleeve 14. The U-shaped groove 25 reciprocates along the axial direction with the screw nut 24 when the hexagonal head screw 23 rotates. The U-shaped groove 25 is located at the front end of the expansion depth limit sleeve 15, and the edge of the U-shaped groove 25 is against the side of the expansion depth limit sleeve 15.
[0019] When in use, first extend the mechanical expansion rod 1 through the tube sheet hole into the tube head of the U-shaped heat exchange tube, rotate the expansion tube hexagonal head 17, so that the expansion bead 13, the expansion rod 12 and the tube head of the U-shaped heat exchange tube are expanded and fixed, insert the positioning column 21 at the front end of the sliding screw 2 into the tube sheet hole adjacent to the U-shaped heat exchange tube, and clamp the U-shaped groove 25 on the expansion sleeve at the front end of the expansion depth limiting sleeve 15, assemble an electric wrench at the tail of the hexagonal screw 23, drive the sliding screw 2 to rotate by the electric wrench, and under the push of the expansion depth limiting sleeve 15, the screw nut 24 and the U-shaped groove 25 reciprocate along the axis of the hexagonal screw 23, and the mechanical tube expander 1 pulls the U-shaped heat exchange tube outward.
[0020] The scope of protection claimed by the present invention is not limited to the above specific implementation methods. For those skilled in the art, the present invention may have various deformations and changes. Any modification, improvement and equivalent substitution made within the concept and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A U-tube heat exchanger tube pulling device, characterized in that: The sliding screw (2) comprises a hexagonal screw (23), the front end of the hexagonal screw (23) is provided with a positioning column (21) extending into the tube sheet hole through a limiting platform (22) having a diameter larger than that of the tube sheet hole, the positioning column (21), the limiting platform (22) and the hexagonal screw (23) are coaxially fixed, a screw nut (24) is rotatably mounted on the hexagonal screw (23), and a U-shaped groove (25) for clamping with the mechanical expansion tube (1) is welded on the outer side of the screw nut (24); The mechanical expansion tube (1) comprises an expansion rod (12), an expansion sleeve (14) is sleeved on the expansion rod (12), an expansion depth limiting sleeve (15) is fixed to the rear end of the expansion sleeve (14) by means of a positioning screw (16), the U-shaped groove (25) is clamped on the expansion sleeve (14), and the U-shaped groove (25) is located at the front end of the expansion depth limiting sleeve (15).
2. A U-tube heat exchanger tube pulling device according to claim 1, characterized in that: The edge of the U-shaped groove (25) abuts against the side edge of the expansion depth limiting sleeve (15).
3. The U-tube heat exchanger extrusion device according to claim 1, characterized in that: The positioning column (21) is inserted into a tube sheet hole adjacent to the U-shaped heat exchange tube that is extracted by the mechanical tube expansion (1).
4. The U-tube heat exchanger extubation device according to claim 1, characterized in that: A sealing nut (11) is provided at the top end of the expansion rod (12), and an expansion bead (13) and an expansion sleeve (14) which cooperate with each other are provided on the expansion rod (12). An expansion tube hexagonal head (17) is integrally fixed to the tail end of the expansion rod (12).
5. A U-tube heat exchanger tube pulling device according to claim 4, characterized in that: The front end of the expansion sleeve (14) is provided with an expansion bead groove, and the expansion bead (13) is installed in the expansion bead groove of the expansion sleeve (14).
6. A U-tube heat exchanger tube pulling device according to claim 1, characterized in that: The U-shaped groove (25) reciprocates along the axial direction along with the lead screw nut (24) when the hexagonal lead screw (23) rotates.
7. A U-tube heat exchanger tube pulling device according to claim 1, characterized in that: The tail end of the hexagonal screw (23) cooperates with an electric wrench.