A spiral link shaft head fixing device

Abstract

The present application belongs to the technical field of power station heat exchange equipment, and discloses a spiral ribbon shaft head fixing device. The spiral ribbon shaft head fixing device comprises a spiral ribbon shaft head, a lining pipe and a plurality of claw assemblies. The spiral ribbon shaft head is located inside a condenser cooling water pipe. The lining pipe is fixedly installed inside the condenser cooling water pipe. The lining pipe is coaxial with the spiral ribbon shaft head. The lining pipe and the spiral ribbon shaft head are arranged at intervals along the extension direction of the condenser cooling water pipe. A plurality of hook head clamping grooves are arranged at intervals along the circumference of the outer circumferential wall of the lining pipe. The plurality of claw assemblies are arranged at intervals along the circumference of the spiral ribbon shaft head. Each claw assembly comprises a claw connecting arm and a clamping hook head. The first end of the claw connecting arm is fixedly connected to the outer circumferential wall of the spiral ribbon shaft head. The second end of the claw connecting arm is provided with the clamping hook head. The clamping hook head is clamped and fixed in the corresponding hook head clamping groove. The spiral ribbon shaft head fixing device effectively prevents the spiral ribbon shaft head from rotating with the spiral ribbon.

Description

Technical Field

[0001] This invention relates to the field of power plant heat exchange equipment technology, and in particular to a spiral ribbon shaft fixing device. Background Technology

[0002] To enhance heat exchange, condensers in power plant steam turbines typically employ spiral ribbon heat exchange technology. This involves a spiral ribbon rotating rapidly within the condenser cooling water tubes, agitating the cooling water and improving the condenser's heat exchange efficiency. In this technology, the spiral ribbon shaft head is usually secured to the inner wall of the condenser cooling water tube using a gripper. Relying on the rigidity of the gripper for positioning, this can lead to a weak grip. Under the high-speed rotation of the spiral ribbon, the shaft head may follow the flow, causing wear and tear on the tube walls over time, potentially leading to damage. Furthermore, a weak grip allows the spiral ribbon shaft head to detach from the cooling water tubes under water flow impact, disrupting the condenser's normal operation.

[0003] Therefore, there is an urgent need for a spiral ribbon shaft fixing device to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a spiral ribbon shaft fixing device to prevent the spiral ribbon shaft from rotating with the spiral ribbon, avoid wear and damage to the pipe wall of the condenser cooling water pipe, and improve the stability of the spiral ribbon shaft relative to the condenser cooling water pipe.

[0005] To achieve this objective, the present invention adopts the following technical solution: A spiral ribbon shaft fixing device, comprising: The spiral ribbon shaft head is located inside the condenser cooling water pipe; A liner is fixedly installed inside the condenser cooling water pipe. The liner is coaxial with the spiral ribbon shaft head, and the liner and the spiral ribbon shaft head are arranged at intervals along the extension direction of the condenser cooling water pipe. Multiple hook slots are provided at intervals along the circumference of the outer peripheral wall of the liner. Multiple jaw assemblies are arranged at circumferential intervals along the spiral ribbon shaft head. Each jaw assembly corresponds to a hook head slot. Each jaw assembly includes a jaw connecting arm and a snap-fit ​​hook head. The first end of the jaw connecting arm is fixedly connected to the outer peripheral wall of the spiral ribbon shaft head, and the second end of the jaw connecting arm is provided with the snap-fit ​​hook head, which snaps and fixes itself in the corresponding hook head slot.

[0006] As an optional solution, the snap hook head includes a connecting flat part, an abutting inclined part, and a snap-fit ​​part in sequence. The connecting flat part is disposed on the inner side wall of the second end of the claw connecting arm. The abutting inclined part slopes towards the inside of the liner from one end near the liner tube to one end near the spiral ribbon shaft head. The snap-fit ​​part is provided with a locking groove. The shape of the hook head slot is adapted to the shape of the hook head. The inner bottom wall of the hook head slot is an inclined bottom wall, which abuts against the inclined surface. A locking protrusion is provided on the inner side wall of the hook head slot opposite to the spiral ribbon shaft head. The locking protrusion is inserted into the locking groove.

[0007] As an optional solution, the protrusion is located at the entrance end of the hook slot, and the end of the protrusion is provided with a guide radius.

[0008] As an optional feature, the end of the liner near the helical ribbon shaft is provided with a chamfered right angle, and during the process of inserting the liner into the condenser cooling water pipe, the chamfered right angle surface slides against the abutting inclined surface.

[0009] As an optional solution, the claw connecting arm includes a hook mounting section, an elastic bending section and a connecting arm body section connected in sequence. The end of the hook mounting section is provided with the snap-fit ​​hook. The end of the connecting arm body section is fixedly connected to the outer peripheral wall of the spiral ribbon shaft. An arc-shaped groove is provided on the elastic bending section.

[0010] As an optional solution, the claw connecting arm further includes: An arc-shaped spring piece, one end of which is connected to the hook mounting section, and the other end of which is connected to the connecting arm main body section, the arc-shaped spring piece spans the arc-shaped groove, the arc-shaped spring piece protrudes towards the outside of the elastic bending section, and the arc-shaped spring piece is located on the outside of the elastic bending section.

[0011] As an optional solution, an axial groove is formed on the outer wall of the connecting arm body section, the axial groove extending along the axial direction of the spiral ribbon shaft head, and the spiral ribbon shaft head fixing device further includes an unlocking mechanism, the unlocking mechanism comprising: An operating component is disposed on the spiral ribbon shaft head; A transmission plate is slidably disposed in the axial groove, and a first end of the transmission plate is connected to the operating component, which is configured to drive the transmission plate to move along the axial groove. The traction rod has its first end hinged to the second end of the transmission plate, and its second end hinged to the hook mounting section.

[0012] As an optional solution, the operating components include: A locking ring, which is fixedly sleeved on the outer periphery of the spiral ribbon shaft head; An unlocking knob is rotatably fitted onto the outer periphery of the spiral ribbon shaft, and the inner peripheral wall of the unlocking knob is threadedly connected to the outer peripheral wall of the locking ring. A bearing, wherein the inner ring of the bearing is fixedly sleeved on the outer circumference of the unlocking knob; A traction ring is fixedly sleeved on the outer circumference of the outer ring of the bearing, and the outer wall of the traction ring is fixedly connected to the first end of the transmission plate.

[0013] As an optional solution, the operating component further includes: A limiting ring is provided at the end of the locking ring away from the unlocking knob. The limiting ring can abut against the end of the unlocking knob to limit the limit position of the unlocking knob's movement relative to the locking ring toward the liner.

[0014] As an optional solution, the spiral ribbon shaft fixing device further includes: A vibration damping convex ring is fixedly disposed on the outer peripheral wall of the liner, and the outer peripheral wall of the vibration damping convex ring is in interference fit with the inner peripheral wall of the condenser cooling water pipe.

[0015] The beneficial effects of this invention are: This invention provides a spiral ribbon shaft fixing device, which includes a spiral ribbon shaft, a liner, and multiple claw assemblies that cooperate with each other. The spiral ribbon shaft is located inside the condenser cooling water pipe, and the liner is fixedly installed inside the condenser cooling water pipe. The liner and the spiral ribbon shaft are coaxial and are arranged at intervals along the extension direction of the condenser cooling water pipe. Multiple hook slots are spaced apart on the outer peripheral wall of the liner. Multiple claw assemblies are arranged at intervals along the circumference of the spiral ribbon shaft, and each claw assembly corresponds to a hook slot. Each claw assembly includes a claw connecting arm and a hook. The first end of the claw connecting arm is fixedly connected to the outer peripheral wall of the spiral ribbon shaft, and the second end of the claw connecting arm is provided with a hook that is locked in the corresponding hook slot.

[0016] This spiral ribbon shaft fixing device uses a liner to fix the liner inside the condenser cooling water pipe. Multiple hook slots are spaced circumferentially on the outer wall of the liner, allowing the hooks on the claw assembly to engage and fix in the corresponding hook slots. This achieves a limiting and fixing effect on the spiral ribbon shaft. The engagement of the hooks with the hook slots effectively ensures the stability of the spiral ribbon shaft relative to the condenser cooling water pipe, preventing the spiral ribbon shaft from rotating with the spiral ribbon and avoiding it from detaching from the condenser cooling water pipe under water flow impact, thus ensuring the normal operation of the condenser. Furthermore, because the claw assembly engages with the additionally installed liner, and effectively prevents the spiral ribbon shaft head from rotating with the spiral ribbon, the claw assembly and spiral ribbon shaft head are prevented from causing wear and damage to the condenser cooling water pipe wall due to rotation. This, in turn, prevents cooling water leakage from the condenser cooling water pipe from contaminating the boiler feedwater quality, significantly reduces unplanned unit shutdowns and maintenance costs, and extends equipment service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the spiral ribbon shaft fixing device provided in an embodiment of the present invention; Figure 2 This is an exploded view of the spiral ribbon shaft fixing device provided in an embodiment of the present invention; Figure 3 yes Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 This is a structural cross-sectional view of the spiral ribbon shaft fixing device provided in an embodiment of the present invention; Figure 5 yes Figure 4 Enlarged view of the structure at point B; Figure 6 yes Figure 4 Enlarged view of the structure at point C.

[0018] In the picture: 1. Spiral ribbon shaft head; 2. Liner; 21. Hook head slot; 22. Inclined bottom wall; 23. Snap protrusion; 231. Guide fillet; 24. Right angle chamfer; 25. Rounded corner; 3. Claw assembly; 31. Claw connecting arm; 311. Hook mounting section; 312. Flexible bending section; 3121. Arc groove; 313. Connecting arm main body section; 3131. Axial sliding groove; 314. Arc-shaped spring piece; 32. Hook head engaging; 321. Connecting flat part; 322. Abutting inclined part; 323. Engaging part; 3231. Locking groove; 4. Unlocking mechanism; 41. Operating components; 411. Locking ring; 412. Unlocking knob; 413. Bearing; 414. Traction ring; 415. Limiting ring; 42. Transmission plate; 43. Traction rod; 5. Vibration-damping convex ring. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] In related technologies, the spiral ribbon shaft head is typically secured to the inner wall of the condenser cooling water pipe using a gripper. Positioning and installation rely on the rigidity of the gripper. However, this method is prone to insecure gripping. Under the high-speed rotation of the spiral ribbon, the shaft head can easily rotate along with it. Prolonged rotation can cause wear and tear on the pipe wall, leading to damage. Furthermore, a weak grip allows the spiral ribbon shaft head to detach from the condenser cooling water pipe under water flow impact, affecting the normal operation of the condenser.

[0024] To solve the above problems, such as Figures 1-3 As shown, this embodiment provides a spiral ribbon shaft head fixing device, which includes a spiral ribbon shaft head 1, a liner 2, and multiple claw assemblies 3. The spiral ribbon shaft head 1 is located inside the condenser cooling water pipe, and the liner 2 is fixedly installed inside the condenser cooling water pipe. The liner 2 and the spiral ribbon shaft head 1 are coaxial and are arranged at intervals along the extension direction of the condenser cooling water pipe. Multiple hook slots 21 are provided at intervals along the circumference of the outer peripheral wall of the liner 2. Multiple claw assemblies 3 are arranged at intervals along the circumference of the spiral ribbon shaft head 1, and each claw assembly 3 corresponds to a hook slot 21. Each claw assembly 3 includes a claw connecting arm 31 and a hook 32. The first end of the claw connecting arm 31 is fixedly connected to the outer peripheral wall of the spiral ribbon shaft head 1, and the second end of the claw connecting arm 31 is provided with a hook 32, which is fixedly engaged in the corresponding hook slot 21. The spiral ribbon shaft head fixing device provided in this embodiment, by setting a liner 2 and fixing the snap-fit ​​hook 32 in the hook groove 21 of the liner 2, achieves the limiting and fixing of the spiral ribbon shaft head 1. The snap-fit ​​fixing of the snap-fit ​​hook 32 and the hook groove 21 effectively ensures the stability of the spiral ribbon shaft head 1 relative to the condenser cooling water pipe, effectively prevents the spiral ribbon shaft head 1 from rotating with the spiral ribbon, and also avoids the spiral ribbon shaft head 1 from detaching from the condenser cooling water pipe under the impact of water flow, ensuring the normal operation of the condenser. In addition, since the claw assembly 3 is snapped with the additionally set liner 2, and effectively prevents the spiral ribbon shaft head 1 from rotating with the spiral ribbon, it avoids the claw assembly 3 and the spiral ribbon shaft head 1 from causing wear and damage to the pipe wall of the condenser cooling water pipe due to rotation, thereby avoiding the leakage of cooling water in the condenser cooling water pipe and polluting the boiler feedwater quality, significantly reducing the unit's unplanned shutdown and operation and maintenance costs, and extending the service life of the equipment.

[0025] Optionally, in this embodiment, the spiral ribbon shaft head fixing device includes three claw assemblies 3, which are evenly spaced along the circumference of the spiral ribbon shaft head 1, effectively ensuring the stability of the spiral ribbon shaft head 1 and the liner 2 in a secure connection. In other embodiments, the specific number of claw assemblies 3 can be set according to requirements.

[0026] In this embodiment, as Figures 3-5As shown, the snap hook 32 includes a connecting flat portion 321, an abutting inclined portion 322, and a snap-fit ​​portion 323 arranged sequentially from end to end. The connecting flat portion 321 is disposed on the inner side wall of the second end of the claw connecting arm 31. The abutting inclined portion 322 slopes towards the inside of the liner 2 from one end near the liner 2 to the other end near the spiral ribbon shaft 1. The snap-fit ​​portion 323 is provided with a locking groove 3231. The shape of the hook head slot 21 is adapted to the shape of the snap hook 32. The inner bottom wall of the hook head slot 21 is an inclined bottom wall 22, which abuts against the abutting inclined portion 322. A snap protrusion 23 is provided on the inner side wall of the hook head slot 21 facing away from the spiral ribbon shaft 1. The snap protrusion 23 is inserted into the locking groove 3231. The shapes of the hook head 32 and the hook head groove 21 are designed such that the hook head groove 21 is wedge-shaped, and the area on the hook part 323 without the locking groove 3231 forms a protrusion that inserts into the inner wall of the hook head groove 21 away from the spiral ribbon shaft head 1, so that the hook head 32 and the inner wall of the hook head groove 21 away from the spiral ribbon shaft head 1 engage with each other, effectively improving the stability of the self-locking of the hook head 32 in the hook head groove 21.

[0027] Optionally, in this embodiment, as Figures 3-5 As shown, the locking protrusion 23 is located at the inlet end of the hook head slot 21, and the end of the locking protrusion 23 is provided with a guide radius 231. This arrangement allows the abutting bevel 322 of the locking hook 32 to move relative to the outer peripheral wall of the liner 2 during the insertion of the liner 2 towards the spiral ribbon shaft 1 into the condenser cooling water pipe. This causes the abutting bevel 322 of the locking hook 32 to pass sequentially through the outer wall of the locking protrusion 23 and the guide radius 231 before entering the hook head slot 21. The guide radius 231 on the locking protrusion 23 and the abutting bevel 322 provide guidance, facilitating the smooth sliding of the locking hook 32 into or out of the hook head slot 21, thus facilitating the installation or removal of the locking hook 32 within the hook head slot 21.

[0028] Optionally, such as Figure 5 As shown, the end of the liner 2 near the helical ribbon shaft 1 is provided with a chamfered right angle 24. During the insertion of the liner 2 into the condenser cooling water pipe, the inclined surface of the chamfered right angle 24 slides against the inclined abutment surface 322. This arrangement ensures that during the insertion of the liner 2 into the condenser cooling water pipe towards the helical ribbon shaft 1, the inclined surface of the chamfered right angle 24 first slides against the inclined abutment surface 322, providing guidance for the installation of the liner 2. This facilitates smooth installation and removal of the liner 2, eliminating the need for repeated manual calibration during installation and preventing jamming or damage to components. Furthermore, by providing the chamfered right angle 24 at the end of the liner 2, stress at the end of the liner 2 can be relieved, preventing cracking at the pipe opening due to stress concentration and ensuring the service life of the liner 2.

[0029] Optionally, in this embodiment, as Figure 4 As shown, the end of the liner 2 furthest from the spiral ribbon shaft 1 is provided with a rounded corner 25. The interaction between the right angle 24 and the rounded corner 25 can relieve the stress at the two ends of the liner 2, prevent the two ends of the liner 2 from cracking due to stress concentration, and further ensure the service life of the liner 2.

[0030] Optionally, in this embodiment, as Figure 1 and Figure 2 As shown, the spiral ribbon shaft fixing device also includes a vibration damping ring 5, which is fixedly mounted on the outer peripheral wall of the liner 2, and the outer peripheral wall of the vibration damping ring 5 is press-fitted against the inner peripheral wall of the condenser cooling water pipe. This arrangement ensures the stability of the liner 2 within the condenser cooling water pipe, and the vibration damping ring 5 helps absorb water flow pulsations and rotational vibrations, suppressing the liner 2 from shifting or loosening, and improving the overall structural stability. Optionally, the vibration damping ring 5 is an elastic ring. It should be noted that during the installation of the liner 2, the outer wall of the liner 2 is expanded and fixed using a tube expander, thereby ensuring a tight fit between the vibration damping ring 5 and the inner peripheral wall of the condenser cooling water pipe.

[0031] In this embodiment, as Figure 4 and Figure 5 As shown, the claw connecting arm 31 includes a hook mounting section 311, an elastic bending section 312, and a connecting arm main body section 313 connected in sequence. The end of the hook mounting section 311 is provided with a snap-fit ​​hook 32. The end of the connecting arm main body section 313 is fixedly connected to the outer peripheral wall of the spiral ribbon shaft head 1. An arc-shaped groove 3121 is formed on the elastic bending section 312. By providing the elastic bending section 312 between the hook mounting section 311 and the connecting arm main body section 313, radial contraction and rebound force are provided for the hook mounting section 311 and the snap-fit ​​hook 32, ensuring that the hook mounting section 311 can drive the snap-fit ​​hook 32 to undergo radial elastic deformation relative to the connecting arm main body section 313, and ensuring that the snap-fit ​​hook 32 can elastically snap into the hook slot 21. Specifically, in this embodiment, a connecting plane portion 321 is provided on the inner sidewall of the end of the hook mounting section 311. Optionally, in this embodiment, the outer wall of the claw connecting arm 31 always has a gap with the inner wall of the condenser cooling water pipe to prevent the claw connecting arm 31 from directly contacting and abrading the pipe wall of the condenser cooling water pipe.

[0032] Optionally, in this embodiment, as Figure 5As shown, the claw connecting arm 31 also includes an arc-shaped spring piece 314. One end of the arc-shaped spring piece 314 is connected to the hook mounting section 311, and the other end is connected to the connecting arm main body section 313. The arc-shaped spring piece 314 spans the arc-shaped groove 3121 and protrudes outward toward the elastic bending section 312, and is located on the outside of the elastic bending section 312. By setting the arc-shaped spring piece 314, the arc-shaped spring piece 314 and the elastic bending section 312 cooperate with each other to form a double elastic compensation structure, which effectively improves the elastic clamping force and elastic recovery force of the hook head 32 and the hook mounting section 311 relative to the connecting arm main body section 313, ensuring the stability of the hook head 32 in the hook head groove 21, effectively resisting water flow impact, and preventing the spiral ribbon shaft head 1 from falling off.

[0033] In this embodiment, as Figures 2-4 As shown, an axial groove 3131 is provided on the outer side wall of the main body section 313 of the connecting arm. The axial groove 3131 extends along the axial direction of the spiral ribbon shaft head 1. The spiral ribbon shaft head fixing device also includes an unlocking mechanism 4. The unlocking mechanism 4 includes an operating component 41, a transmission plate 42, and a traction rod 43. The operating component 41 is disposed on the spiral ribbon shaft head 1. The transmission plate 42 is slidably disposed in the axial groove 3131. The first end of the transmission plate 42 is connected to the operating component 41. The operating component 41 is configured to drive the transmission plate 42 to move along the axial groove 3131. The first end of the traction rod 43 is hinged to the second end of the transmission plate 42. The second end of the traction rod 43 is hinged to the hook mounting section 311. By operating the operating component 41, all the transmission plates 42 are moved along the corresponding axial grooves 3131 in a direction away from the liner 2. This allows each traction rod 43 to pull the corresponding hook mounting section 311 relative to the connecting arm main body section 313, causing it to rotate radially outward from the liner 2. This disengages each snap-fit ​​hook 32 from the hook slot 21, thus unlocking the device. This setup can be achieved simply by operating the operating component 41, eliminating the need for manual manipulation of the hook mounting sections 311, making the unlocking operation effortless and convenient. It should be noted that in this embodiment, the axial groove 3131 has an I-shaped cross-section, and the shape of the transmission plate 42 matches the shape of the axial groove 3131. This ensures that the transmission plate 42 can only move along the axial groove 3131 in a direction closer to or further away from the liner 2, preventing the transmission plate 42 from detaching from the axial groove 3131 and ensuring the reliability of the transmission plate 42's movement along the axial groove 3131. It should be noted that by causing the operating component 41 to drive all the transmission plates 42 to move along the corresponding axial grooves 3131 towards the liner 2, each snap hook 32 and the hook mounting section 311 can be elastically reset relative to the connecting arm body section 313.

[0034] In this embodiment, as Figure 2 , Figure 4 and Figure 6 As shown, the operating component 41 includes a locking ring 411, an unlocking knob 412, a bearing 413, and a traction ring 414. The locking ring 411 is fixedly sleeved on the outer circumference of the spiral ribbon shaft 1. The unlocking knob 412 is rotatably sleeved on the outer circumference of the spiral ribbon shaft 1, and its inner circumferential wall is threadedly connected to the outer circumferential wall of the locking ring 411. The inner ring of the bearing 413 is fixedly sleeved on the outer circumference of the unlocking knob 412. The traction ring 414 is fixedly sleeved on the outer circumference of the outer ring of the bearing 413, and its outer wall is fixedly connected to the first end of the transmission plate 42. By rotating the unlocking knob 412, the unlocking knob 412 drives the traction ring 414 to move axially along the locking ring 411, causing the traction ring 414 to synchronously pull each transmission plate 42 along the corresponding axial groove 3131 towards or away from the liner 2. The structural design of the aforementioned operating component 41 allows for unlocking by rotating the unlocking knob 412, making the operation convenient and the structure simple.

[0035] Optionally, such as Figure 6 As shown, the operating component 41 also includes a limiting ring 415. The limiting ring 415 is provided at the end of the locking ring 411 furthest from the unlocking knob 412. The limiting ring 415 can abut against the end of the unlocking knob 412 to limit the extreme position of the unlocking knob 412 relative to the locking ring 411 in the direction closer to the liner 2, thereby preventing the traction ring 414 from excessively moving each transmission plate 42 along the corresponding axial groove 3131 in the direction closer to the liner 2. Optionally, in this embodiment, the locking ring 411 and the limiting ring 415 are integrally formed.

[0036] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A spiral ribbon shaft head fixing device, characterized in that, include: The spiral ribbon shaft head (1) is located inside the condenser cooling water pipe; Liner (2) is fixedly installed inside the condenser cooling water pipe. The liner (2) is coaxial with the spiral ribbon shaft (1), and the liner (2) and the spiral ribbon shaft (1) are arranged at intervals along the extension direction of the condenser cooling water pipe. Multiple hook slots (21) are provided at intervals along the circumference of the outer peripheral wall of the liner (2). Multiple claw assemblies (3) are arranged at intervals along the circumference of the spiral ribbon shaft head (1). Each claw assembly (3) corresponds to a hook slot (21). Each claw assembly (3) includes a claw connecting arm (31) and a hook head (32). The first end of the claw connecting arm (31) is fixedly connected to the outer peripheral wall of the spiral ribbon shaft head (1). The second end of the claw connecting arm (31) is provided with the hook head (32). The hook head (32) is fixedly engaged in the corresponding hook slot (21).

2. The spiral ribbon shaft fixing device according to claim 1, characterized in that, The snap hook (32) includes a connecting flat part (321), an abutting inclined part (322), and a snap-fit ​​part (323) in sequence. The connecting flat part (321) is disposed on the inner side wall of the second end of the claw connecting arm (31). The abutting inclined part (322) slopes towards the inside of the liner (2) from one end near the liner (2) to one end near the spiral ribbon shaft (1). The snap-fit ​​part (323) is provided with a locking groove (3231). The shape of the hook head slot (21) is adapted to the shape of the hook head (32). The inner bottom wall of the hook head slot (21) is an inclined bottom wall (22). The inclined bottom wall (22) abuts against the abutting inclined surface (322). A locking protrusion (23) is provided on the inner side wall of the hook head slot (21) away from the spiral ribbon shaft head (1). The locking protrusion (23) is inserted into the locking groove (3231).

3. The spiral ribbon shaft fixing device according to claim 2, characterized in that, The protrusion (23) is located at the entrance end of the hook groove (21), and the end of the protrusion (23) is provided with a guide radius (231).

4. The spiral ribbon shaft fixing device according to claim 2, characterized in that, The end of the liner (2) near the spiral ribbon shaft (1) is provided with a chamfer (24). During the process of inserting the liner (2) into the condenser cooling water pipe, the inclined surface of the chamfer (24) slides against the abutting inclined surface (322).

5. The spiral ribbon shaft fixing device according to any one of claims 1 to 4, characterized in that, The claw connecting arm (31) includes a hook mounting section (311), an elastic bending section (312), and a connecting arm body section (313) connected in sequence. The end of the hook mounting section (311) is provided with the snap hook (32). The end of the connecting arm body section (313) is fixedly connected to the outer peripheral wall of the spiral ribbon shaft head (1). An arc groove (3121) is provided on the elastic bending section (312).

6. The spiral ribbon shaft fixing device according to claim 5, characterized in that, The claw connecting arm (31) also includes: An arc-shaped spring piece (314) is provided, one end of which is connected to the hook mounting section (311), and the other end of which is connected to the connecting arm body section (313). The arc-shaped spring piece (314) spans the arc-shaped groove (3121), protrudes outward toward the elastic bending section (312), and is located on the outside of the elastic bending section (312).

7. The spiral ribbon shaft fixing device according to claim 5, characterized in that, An axial groove (3131) is provided on the outer wall of the main body section (313) of the connecting arm. The axial groove (3131) extends along the axial direction of the spiral ribbon shaft head (1). The spiral ribbon shaft head fixing device also includes an unlocking mechanism (4). The unlocking mechanism (4) includes: An operating component (41) is disposed on the spiral ribbon shaft head (1); A transmission plate (42) is slidably disposed in the axial groove (3131). The first end of the transmission plate (42) is connected to the operating component (41). The operating component (41) is configured to drive the transmission plate (42) to move along the axial groove (3131). The first end of the traction rod (43) is hinged to the second end of the transmission plate (42), and the second end of the traction rod (43) is hinged to the hook mounting section (311).

8. The spiral ribbon shaft fixing device according to claim 7, characterized in that, The operating component (41) includes: Locking ring (411), the locking ring (411) is fixedly sleeved on the outer periphery of the spiral ribbon shaft head (1); Unlock knob (412), which is rotatably sleeved on the outer periphery of the spiral ribbon shaft head (1), and the inner peripheral wall of the unlock knob (412) is threadedly connected to the outer peripheral wall of the locking ring (411); The bearing (413) has its inner ring fixedly fitted around the outer periphery of the unlocking knob (412); The traction ring (414) is fixedly sleeved on the outer circumference of the outer ring of the bearing (413), and the outer wall of the traction ring (414) is fixedly connected to the first end of the transmission plate (42).

9. The spiral ribbon shaft fixing device according to claim 8, characterized in that, The operating component (41) further includes: A limiting ring (415) is provided at one end of the locking ring (411) away from the unlocking knob (412). The limiting ring (415) can abut against the end of the unlocking knob (412) to limit the movement of the unlocking knob (412) relative to the locking ring (411) towards the liner (2).

10. The spiral ribbon shaft fixing device according to any one of claims 1 to 4, characterized in that, The spiral ribbon shaft head fixing device also includes: Vibration damping convex ring (5) is fixedly disposed on the outer peripheral wall of the liner (2), and the outer peripheral wall of the vibration damping convex ring (5) is in interference fit with the inner peripheral wall of the condenser cooling water pipe.

Images