Tube expander for shell and tube condensers

Abstract

This utility model discloses a tube expander for shell-and-tube condensers, including a tube expander and an anti-fatigue support assembly. The anti-fatigue support assembly includes a bidirectional hydraulic cylinder, a rectangular plate, a receiving rod, and an abutment rod. The bidirectional hydraulic cylinder is fixedly connected to the bottom of the tube expander, and the rectangular plate is fixedly connected to both sides of the bidirectional hydraulic cylinder. The receiving rod is movably connected to the side of the rectangular plate, and the abutment rod is fixedly connected to the side of the receiving rod. In this utility model, the bidirectional hydraulic cylinder can drive the rectangular plate, the receiving rod, and the abutment rod to move to both sides, so that the abutment rod inserts into the adjacent pipes at both ends of the expanded pipe and firmly abuts them. This eliminates the need for the user to apply external force to maintain the position of the tube expander, completely freeing the hands and fundamentally avoiding hand muscle strain and fatigue caused by prolonged hand use. This ensures continuous and efficient operation for the user and guarantees the efficiency of pipe expansion.

Description

Technical Field

[0001] This utility model relates to the field of tube expander technology, specifically a tube expander for shell-and-tube condensers. Background Technology

[0002] The core component of a shell-and-tube condenser is the connection structure between the heat exchange tubes and the tube sheet, and the tube expander is the key equipment to achieve a tight and sealed connection between the two. Its performance directly affects the heat exchange efficiency, sealing performance and service life of the condenser.

[0003] In existing technologies, when quickly expanding pipes at different locations, it is necessary to move the expansion head of the pipe expander back and forth by hand. To alleviate the user's hand fatigue, the area between the expansion head and the pipe is usually enlarged to achieve a support effect. However, this structure is not very sturdy and still requires the user to apply external force for stabilization. After prolonged use, it will still cause hand fatigue for the user, which will affect the efficiency of subsequent pipe expansion. Therefore, a new structure is needed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a tube expander for shell-and-tube condensers to solve the problems mentioned in the background section. To solve these technical problems, this invention is achieved through the following technical solution: This utility model relates to a tube expander for a shell-and-tube condenser, comprising: tube expander; The fatigue-resistant support assembly includes a bidirectional hydraulic cylinder, a rectangular plate, a receiving rod, and an abutting rod. The bidirectional hydraulic cylinder is fixedly connected to the bottom of the tube expander, and the rectangular plate is fixedly connected to both sides of the bidirectional hydraulic cylinder. The receiving rod is movably connected to the side of the rectangular plate, and the abutting rod is fixedly connected to the side of the receiving rod.

[0005] Furthermore, the side of the abutment rod is configured with an arc structure.

[0006] Furthermore, it also includes a quick-flipping assembly, which includes a circular groove and a limiting shaft. One end of the receiving rod has a circular groove through it, and the limiting shaft is fixedly connected to the side of the rectangular plate. The limiting shaft is movably connected to the circular groove.

[0007] Furthermore, the quick-flipping assembly also includes a right-angle bending plate, a guide groove, a guide rod, a first slot, and a second slot. The right-angle bending plate is fixedly connected to the side of the rectangular plate. A guide groove is formed through the right-angle bending plate. A guide rod is movably connected in the guide groove. The first slot and the second slot are formed on the receiving rod. One end of the guide rod is movably connected to the first slot and the second slot, respectively.

[0008] Furthermore, the first slot is located at the horizontal end of the receiving rod, and the second slot is located at the vertical end of the receiving rod.

[0009] Furthermore, the quick-flipping assembly also includes a limiting ring and a spring, with the limiting ring fixedly connected to the outer side of the guide rod, and the spring located between the limiting ring and the right-angle bending plate.

[0010] Furthermore, the quick-flipping assembly also includes a pull frame, with one end of the guide rod fixedly connected to the pull frame.

[0011] This utility model has the following beneficial effects: This utility model uses a bidirectional hydraulic cylinder to drive a rectangular plate, a receiving rod, and an abutting rod to move to both sides, so that the abutting rod can be inserted into the adjacent pipes at both ends of the expansion joint and firmly abut against them. This structure replaces the traditional method of "expanding the contact area but requiring hand-held stability". It eliminates the need for the user to apply external force to maintain the position of the expansion machine, completely freeing up the hands and avoiding hand muscle strain and fatigue caused by prolonged hand-holding. This ensures that the user can work continuously and efficiently, and guarantees the expansion efficiency of the pipe. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0013] Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 This is a schematic diagram of the connection of the bidirectional hydraulic cylinder at the bottom of the tube expander of this utility model; Figure 3 This is a schematic diagram showing the distribution of the contact rods of this utility model when they are not in use; Figure 4 This is a schematic diagram of the guide rod connection of this utility model.

[0014] The attached diagram lists the components represented by each number as follows: 101. Tube expander; 201. Two-way hydraulic cylinder; 202. Rectangular plate; 203. Support rod; 204. Abutment rod; 301. Circular groove; 302. Limiting shaft; 303. Right-angle bent plate; 304. Guide groove; 305. Guide rod; 306. First slot; 307. Second slot; 308. Limiting ring; 309. Spring; 3010. Pull frame. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0017] Please see Figure 1-4 As shown, this utility model is a tube expander for a shell-and-tube condenser, comprising: Tube expander 101; The tube expander model 101 can be equipped with the ZJ-20 type, which uses mechanical or hydraulic means to plastically deform the heat exchange tubes, tightly bonding them with the tube sheet hole wall to form a sealed and strong connection structure.

[0018] The fatigue-resistant support assembly includes a bidirectional hydraulic cylinder 201, a rectangular plate 202, a supporting rod 203, and an abutting rod 204. The bidirectional hydraulic cylinder 201 is fixedly connected to the bottom of the tube expander 101. The rectangular plate 202 is fixedly connected to both sides of the bidirectional hydraulic cylinder 201. The supporting rod 203 is movably connected to the side of the rectangular plate 202. The abutting rod 204 is fixedly connected to the side of the supporting rod 203. The side of the abutting rod 204 is designed with an arc structure. The bidirectional hydraulic cylinder 201 moves the rectangular plate 202 to both sides, which in turn moves the receiving rod 203 and the contact rod 204 to both sides. The receiving rod 203 and the contact rod 204 are inserted into the adjacent pipes at both ends of the expansion joint of the pipe by the expansion machine 101. Under the action of the bidirectional hydraulic cylinder 201, the contact rod 204 is firmly abutted against the side wall of the pipe into which it is inserted, thereby realizing the tight connection between the expansion joint of the expansion machine 101 and the pipe. At this time, the user can completely free his hands and will not experience hand fatigue during long-term use, thus ensuring the subsequent expansion efficiency.

[0019] Working principle: Move the tube expander 101 to the position of the pipe to be expanded, ensuring that the expander joint of the tube expander 101 is aligned with the target pipe interface. At this time, the anti-fatigue support assembly is in the initial standby state, and the receiving rod 203 and the contact rod 204 have not yet contacted the adjacent pipes. Activate the bidirectional hydraulic cylinder 201 at the bottom of the tube expander 101. The bidirectional hydraulic cylinder 201 outputs power, driving the rectangular plates 202 fixedly connected to both sides to move away from the center of the tube expander 101. As the rectangular plates 202 move, the receiving rod 203, which is movably connected to the side of the rectangular plates 202, moves synchronously to both sides, thereby driving the contact rod 204 fixedly connected to the side of the receiving rod 203 to move closer to the adjacent pipes at both ends of the expanded pipe. Continue to drive the bidirectional hydraulic cylinder 201 until the receiving rod 203 and the contact rod 204 are inserted into the gap between the adjacent pipes at both ends of the expanded pipe. Under the continuous force of the bidirectional hydraulic cylinder 201, the abutment rod 204 (with a rounded side structure to increase the contact area with the pipe and avoid damage to the pipe) firmly abuts against the side wall of the inserted adjacent pipe. After the abutment rod 204 is firmly abutted against the adjacent pipe, a stable support structure is formed between the expansion joint of the tube expander 101 and the target pipe. The user does not need to hold the tube expander 101 to apply external force for stability, and can completely free their hands to start the tube expander 101 to perform pipe expansion operation. This effectively avoids hand fatigue caused by holding the tube for a long time and ensures expansion efficiency. After the pipe expansion at this position is completed, the bidirectional hydraulic cylinder 201 is controlled to run in reverse, driving the rectangular plate 202, the receiving rod 203 and the abutment rod 204 to reset towards the center of the tube expander 101, disengaging from the contact with the adjacent pipe, so that the tube expander 101 can be moved to the next pipe to be expanded.

[0020] Please see Figure 1-4 As shown, this embodiment, based on the above embodiment, further includes: The quick-flipping assembly includes a circular groove 301 and a limiting shaft 302. One end of the receiving rod 203 passes through the circular groove 301. The side of the rectangular plate 202 is fixedly connected to the limiting shaft 302, and the limiting shaft 302 is movably connected to the circular groove 301. The limiting shaft 302 and the circular groove 301 work together to ensure the rotation of the receiving rod 203 and the abutting rod 204 on the rectangular plate 202.

[0021] The quick-flip assembly also includes a right-angle bending plate 303, a guide groove 304, a guide rod 305, a first slot 306, and a second slot 307. The right-angle bending plate 303 is fixedly connected to the side of the rectangular plate 202. The guide groove 304 is opened through the right-angle bending plate 303. The guide rod 305 is movably connected in the guide groove 304. The first slot 306 and the second slot 307 are opened on the receiving rod 203. One end of the guide rod 305 is movably connected to the first slot 306 and the second slot 307, respectively. The depth of the first slot 306 is located at the horizontal end of the receiving rod 203, and the depth of the second slot 307 is located at the vertical end of the receiving rod 203. The right-angle bend plate 303 ensures the opening of the guide groove 304, and the guide groove 304 ensures the movable connection of the guide rod 305. When the guide rod 305 is inserted into the first slot 306, the receiving rod 203 and the abutting rod 204 are in a parallel position to the ground, and at this time, the receiving rod 203 and the abutting rod 204 are in use. When the guide rod 305 is inserted into the second slot 307, the receiving rod 203 and the abutting rod 204 are in a vertical position to the ground, and at this time, the receiving rod 203 and the abutting rod 204 are in a non-use, stored state. In the non-use, stored state, the receiving rod 203 and the abutting rod 204 can be used when expanding the pipe on the opposite side (at this time, there is no adjacent pipe to insert into the receiving rod 203 and the abutting rod 204 on one side).

[0022] The quick-flip assembly also includes a limiting ring 308 and a spring 309. The limiting ring 308 is fixedly connected to the outer side of the guide rod 305, and the spring 309 is located between the limiting ring 308 and the right-angle bending plate 303. The quick-flip assembly also includes a pull frame 3010, and one end of the guide rod 305 is fixedly connected to the pull frame 3010. The setting of the limiting ring 308 provides a guarantee for the limiting connection of the spring 309. The setting of the spring 309 can quickly lock and limit when the guide rod 305 is inserted into the first slot 306 or the second slot 307, thereby realizing the quick switching and locking of the receiving rod 203 and the abutment rod 204 in different states, which improves the overall switching efficiency. The setting of the pull frame 3010 makes it convenient for the user to pull the guide rod 305.

[0023] Working principle: When not in use and needing to be stored, hold the pull frame 3010 and pull the guide rod 305 outwards. This causes the guide rod 305 to move along the guide groove 304 and compress the spring 309 until the guide rod 305 is completely disengaged from the first slot 306. Using the limiting shaft 302 as the rotation axis, the receiving rod 203 and the abutment rod 204 are flipped from the horizontal ground state to the vertical ground state. At this time, the end of the receiving rod 203 away from the abutment rod 204 rotates around the limiting shaft 302. When the receiving rod 203 and the abutment rod 204 are flipped to the vertical ground state, the second slot 307 is aligned with the guide rod 305. Release the pull frame 3010, and the spring 309 elastically returns to its original position, pushing the guide rod 305 into the second slot 307, completing the storage state locking. This facilitates the movement and use of the tube expander 101 in scenarios where side pipe expansion is required (where there are no adjacent pipes to insert support components). Repeating the above process in reverse will achieve the switching of working states.

[0024] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A tube expander for use in a shell and tube condenser, the expander comprising: include: Tube expander (101); The fatigue-resistant support assembly includes a bidirectional hydraulic cylinder (201), a rectangular plate (202), a support rod (203), and an abutment rod (204). The bottom of the tube expander (101) is fixedly connected to the bidirectional hydraulic cylinder (201), the two sides of the bidirectional hydraulic cylinder (201) are fixedly connected to the rectangular plate (202), the side of the rectangular plate (202) is movably connected to the support rod (203), and the side of the support rod (203) is fixedly connected to the abutment rod (204).

2. The tube expander for use in a shell and tube condenser according to claim 1, characterized in that: The side of the abutment rod (204) is arranged in an arc structure.

3. The tube expander for use in a shell and tube condenser according to claim 1, characterized in that: It also includes a quick-flipping assembly, which includes a circular groove (301) and a limiting shaft (302). One end of the receiving rod (203) passes through the circular groove (301). The side of the rectangular plate (202) is fixedly connected to the limiting shaft (302), and the limiting shaft (302) is movably connected to the circular groove (301).

4. The tube expander for use in a shell and tube condenser according to claim 3, characterized in that: The quick-flipping assembly also includes a right-angle bending plate (303), a guide groove (304), a guide rod (305), a first slot (306), and a second slot (307). The right-angle bending plate (303) is fixedly connected to the side of the rectangular plate (202). The guide groove (304) is opened through the right-angle bending plate (303). The guide rod (305) is movably connected in the guide groove (304). The first slot (306) and the second slot (307) are opened on the receiving rod (203). One end of the guide rod (305) is movably connected to the first slot (306) and the second slot (307).

5. The tube expander for use in a shell and tube condenser according to claim 4, characterized in that: The first slot (306) is opened at the horizontal end of the receiving rod (203), and the second slot (307) is opened at the vertical end of the receiving rod (203).

6. The tube expander for use in a shell and tube condenser according to claim 4, characterized in that: The quick-flip assembly also includes a limiting ring (308) and a spring (309). The limiting ring (308) is fixedly connected to the outside of the guide rod (305), and the spring (309) is located between the limiting ring (308) and the right-angle bending plate (303).

7. The tube expander for use in a shell and tube condenser according to claim 4, characterized in that: The quick-flip assembly also includes a pull frame (3010), and one end of the guide rod (305) is fixedly connected to the pull frame (3010).

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