A valve-gland type shockproof expansion joint

Abstract

This utility model discloses a valve-type compression-type vibration-damping expansion joint, including an upper pipe cover, a lower pipe cover, a top cover, and a mounting groove. The lower pipe cover is located below the upper pipe cover, and the top cover is located above the upper pipe cover. Each of the upper, lower, and top covers has a mounting groove. Multiple damping rod assemblies are installed within the mounting grooves. Each damping rod assembly is fixedly connected to one side of the inner wall of the mounting groove via a damper. A telescopic rod is installed within the damper, and one end of the telescopic rod is fixedly connected to one side of a rubber pad. This device utilizes a multi-layer composite vibration-damping structure and an adjustable telescopic cover mechanism to achieve efficient vibration absorption and flexible adjustment of the protection range, solving the problems of existing devices lacking effective vibration damping adaptability and installation space compatibility.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline vibration reduction, specifically a valve gland type anti-vibration expansion joint. Background Technology

[0002] In industrial piping systems, valve connections often experience significant stress due to fluid impact, mechanical vibration, or thermal expansion and contraction. Traditional rigid connections are prone to pipe deformation or seal failure. Existing anti-vibration expansion joints mostly employ single rubber dampers or simple bellows structures, which suffer from limited damping effectiveness, inability to accommodate large displacement compensation, and lack of adjustability, making precise protection difficult in complex installation environments. Furthermore, conventional expansion joints often lack targeted protection for critical valve components, leading to fatigue cracking and seal leakage with prolonged use, severely impacting the safety and service life of the piping system. Therefore, a new solution integrating efficient damping, intelligent adjustment, and precise protection is urgently needed.

[0003] A search revealed Chinese patent publication number CN218178217U, which discloses a valve gland type anti-vibration telescopic device, relating to the field of valve technology. The device includes a valve body, with an inlet pipe fixedly connected to its top. A valve switch is located on the right side of the valve body, and an outlet pipe is fixedly connected to its bottom. A buffer assembly is provided on the outer wall of the inlet pipe, including a fixing block that is slidably connected to the outer wall of the inlet pipe. The anti-vibration shell is fitted onto the outer wall of the inlet pipe, allowing the fixing block to slide into a groove on the outer wall. When the inlet pipe shifts during installation, it transmits pressure to the fixing block, which then transmits the pressure to a buffer spring via a connecting rod. The buffer spring, through its own reverse elasticity, resets the connecting rod, thus achieving a buffering effect and preventing the inlet pipe from vibrating excessively or falling off during installation.

[0004] However, although the device achieves a certain shock absorption effect through the buffer spring, it is difficult to cope with continuous high-frequency vibration by relying on a single spring structure. Long-term use is prone to spring fatigue failure. In addition, there is a gap in the sliding fit between the fixed block and the slide, which may produce loosening and abnormal noise. The overall structure has limited ability to compensate for the radial displacement of the water inlet pipe and cannot meet the all-round shock protection requirements under complex working conditions. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a valve-gland type shock-absorbing expansion joint, which solves the problems of existing devices lacking effective shock absorption adaptability and installation space compatibility.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a valve-type shock-absorbing expansion joint, comprising an upper pipe cover, a lower pipe cover, a top cover, and a mounting groove. The lower pipe cover is located below the upper pipe cover, and the top cover is located above the upper pipe cover. Mounting grooves are provided inside the upper pipe cover, the lower pipe cover, and the top cover. Multiple damping rod kits are provided in the mounting grooves. The damping rod kits are fixedly connected to one side of the inner wall of the mounting groove through a damper. A telescopic rod is provided inside the damper. One end of the telescopic rod is fixedly connected to one side of a rubber pad. The high elasticity and deformability of rubber can absorb impact energy and reduce the vibration transmitted to the damping rod kits.

[0007] When in use, this device is fitted onto the outer wall of the valve pipe. When the pipe vibrates, the damping components inside the upper pipe cover, lower pipe cover, and top cover take effect. The vibration is first transmitted to the rubber pad, which provides initial cushioning. Then, the vibration force is transmitted along the telescopic rod to the damper, which absorbs the vibration energy and converts it into heat energy, further reducing the vibration of the device. When there is insufficient installation space, the worker can use a wrench to turn the knob. Turning the knob drives the second threaded rod to rotate and move axially, causing the moving block connected to the second threaded rod to press against the top cover and move axially together. Finally, the top cover and the moving tube move outward axially, allowing the moving tube to cover the outer wall of the pipe in the inconvenient operating area, accurately protecting and damping the pipe in that area.

[0008] Preferably, the upper pipe cover is fixedly connected to the sleeve, and a movable pipe is provided inside the sleeve. The movable pipe is fixedly connected to the top cover. After the movable pipe moves, the sleeve can still provide a certain degree of protection for the pipeline in that area.

[0009] Preferably, the sleeve is provided with a plurality of second threaded rods arranged in a circumferential array, and a knob is fixedly connected to the lower end of the second threaded rods. The knob facilitates the worker to adjust the movement stroke of the top cover.

[0010] Preferably, the upper end of the second threaded rod is connected to the movable block, the upper end of the movable block is fixedly connected to the lower outer wall of the top cover, and the second threaded rod and the movable block are connected by a bearing. When the second threaded rod rotates, it only drives the movable block to move axially and does not cause the movable block to rotate.

[0011] Preferably, the upper tube cover is provided with a plurality of first threaded rods arranged in a circumferential array. The upper tube cover is connected to the lower tube cover through the first threaded rods. Both ends of the first threaded rod are provided with nuts. Rotating the nuts at both ends to move them axially toward the center of the first threaded rod can fix the upper tube cover and the lower tube cover to the moving tube.

[0012] Preferably, the upper pipe cover is fitted onto the upper end of the sleeve, and the lower pipe cover is fitted onto the lower end of the sleeve. The installation design of the upper pipe cover, lower pipe cover, and sleeve is based on the existing compression-type expansion joint technology, which will not be described in detail or illustrated here.

[0013] This utility model provides a valve-gland type shockproof expansion joint. It has the following beneficial effects:

[0014] 1. This valve gland type anti-vibration expansion joint effectively absorbs and weakens pipeline vibration through a multi-layer damping structure. When the pipeline vibrates, the vibration energy is first buffered by the rubber pad, whose high elasticity disperses the impact force and reduces the vibration directly transmitted to the pipe cover. Subsequently, the remaining vibration is transmitted to the damper through the expansion rod. The viscous resistance inside the damper converts mechanical energy into heat energy, further dissipating the vibration energy. The synergistic effect of the rubber pad and the damper forms a dual damping mechanism, enabling the device to adapt to pipeline vibrations of different intensities, significantly improving system stability. It is especially suitable for high-pressure or high-frequency vibration environments prone to impact, ensuring long-term safe operation of the pipeline.

[0015] 2. This valve-type compression-type shock-absorbing expansion joint allows for flexible expansion of the coverage distance through a threaded adjustment mechanism, meeting the needs of complex installation environments. Rotating the knob drives the second threaded rod axially, causing the top cover and moving pipe to extend and retract synchronously, thus extending the protection range. This design allows workers to adjust the coverage length according to site space constraints, precisely covering vulnerable areas of the pipeline without disassembling or replacing parts. The threaded drive structure is stable and reliable, easy to operate, and ensures that the extended pipe section still possesses complete shock absorption and sealing functions. It is particularly suitable for pipeline systems with limited space or requiring localized reinforcement protection, significantly improving installation adaptability and maintenance efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the second threaded rod structure of this utility model;

[0018] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 4 This is a schematic diagram of the internal structure of the lower tube cover of this utility model;

[0020] Figure 5 This is a schematic diagram of the damping rod kit of this utility model.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Moving tube; 2. Top cover; 3. Sleeve; 4. Upper tube cover; 5. Lower tube cover; 6. Nut; 7. First threaded rod; 8. Knob; 9. Second threaded rod; 10. Moving block; 11. Sleeve; 12. Rubber pad; 13. Mounting groove; 14. Damping rod kit; 15. Telescopic rod; 16. Damper. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] Please see Figure 1-5 This utility model provides a valve cover type anti-vibration expansion joint, including an upper pipe cover 4, a lower pipe cover 5, a top cover 2, and a mounting groove 13. The lower pipe cover 5 is located below the upper pipe cover 4, and the top cover 2 is located above the upper pipe cover 4. Mounting grooves 13 are provided in the upper pipe cover 4, the lower pipe cover 5, and the top cover 2. Multiple damping rod kits 14 are provided in the mounting grooves 13. The damping rod kits 14 are fixedly connected to one side of the inner wall of the mounting groove 13 through dampers 16. Telescopic rods 15 are provided in the dampers 16. One end of the telescopic rods 15 is fixedly connected to one side of the rubber pad 12. During use, most of the vibration effect comes from the area where the upper pipe cover 4, the lower pipe cover 5, and the top cover 2 are in contact with the pipe. Therefore, the rubber pad 12 is provided to absorb a large amount of vibration energy. The damping rod kits 14 connected to the rubber pad 12 further absorb vibration energy, ensuring the anti-vibration effect of the device.

[0026] Example 2

[0027] Please see Figure 1-5 In this embodiment, the upper tube cover 4 is fixedly connected to the sleeve 11. The sleeve 11 is provided with a movable tube 1, which is fixedly connected to the top cover 2. When in use, after the movable tube 1 moves, the sleeve 11 can maintain the integrity of the device and protect the empty area. The area covered by both the sleeve 11 and the movable tube 1 will have a double protection effect.

[0028] The sleeve 11 is provided with a plurality of second threaded rods 9 arranged in a circumferential array. A knob 8 is fixedly connected to the lower end of the second threaded rods 9. In use, the sleeve 11 is provided with a plurality of threaded holes arranged in a circumferential array. The threads of the threaded holes are engaged with the threads of the second threaded rods 9. The worker uses a wrench or other tools to turn the knob 8 to rotate the second threaded rods 9. The second threaded rods 9 rotate and move axially at the same time.

[0029] The upper end of the second threaded rod 9 is connected to the movable block 10, and the upper end of the movable block 10 is fixedly connected to the lower outer wall of the top cover 2. When in use, the rotation of the second threaded rod 9 can drive the movable block 10 and the top cover 2 to move coaxially, thereby adjusting the telescopic distance of the top cover 2.

[0030] The upper tube cover 4 is provided with a plurality of first threaded rods 7 arranged in a circumferential array. The upper tube cover 4 is connected to the lower tube cover 5 through the first threaded rods 7. Both ends of the first threaded rods 7 are provided with nuts 6. In use, the nuts 6 at both ends of the first threaded rod are rotated. When the nuts 6 at both ends move axially to the center, the upper tube cover 4 and the lower tube cover 5 are aligned and installed on the sleeve 3. When the nuts 6 at both ends move axially away from each other, the upper tube cover 4 and the lower tube cover 5 can be removed from the sleeve 3.

[0031] The upper pipe cap 4 is fitted onto the upper end of the sleeve 3, and the lower pipe cap 5 is fitted onto the lower end of the sleeve 3.

[0032] Instructions for use: When using this device, attach it to the outer wall of the valve pipe. When the pipe vibrates, the damping components inside the upper pipe cover 4, lower pipe cover 5, and top cover 2 take effect. The vibration is first transmitted to the rubber pad 12, which provides some buffering. Then, the vibration force is transmitted along the telescopic rod 15 to the damper 16. The damper 16 absorbs the vibration energy and converts it into heat energy, further reducing the vibration of the device. When there is insufficient installation space, the worker can use a wrench to turn the knob 8. Turning the knob 8 drives the second threaded rod 9 to rotate and move axially, thereby causing the moving block 10 connected to the second threaded rod 9 to press against the top cover 2 and move axially together. Finally, the top cover 2 and the moving tube 1 move outward axially, allowing the moving tube 1 to cover the outer wall of the pipe in the inconvenient operating area, accurately protecting and damping the pipe in that area.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A valve-type compression-type shock-absorbing expansion joint, comprising an upper pipe cover (4), a lower pipe cover (5), a top cover (2), and a mounting groove (13), wherein the lower pipe cover (5) is provided below the upper pipe cover (4), and the top cover (2) is provided above the upper pipe cover (4), and the upper pipe cover (4), the lower pipe cover (5), and the top cover (2) are all provided with mounting grooves (13), characterized in that: The mounting groove (13) is provided with multiple damping rod kits (14). The damping rod kits (14) are fixedly connected to one side of the inner wall of the mounting groove (13) through a damper (16). The damper (16) is provided with a telescopic rod (15). One end of the telescopic rod (15) is fixedly connected to one side of the rubber pad (12).

2. The valve gland type shockproof expansion joint according to claim 1, characterized in that: The upper tube cover (4) is fixedly connected to the sleeve (11), and the sleeve (11) is provided with a movable tube (1), which is fixedly connected to the top cover (2).

3. The valve gland type shockproof expansion joint according to claim 2, characterized in that: The sleeve (11) is provided with a plurality of second threaded rods (9) arranged in a circumferential array, and a knob (8) is fixedly connected to the lower end of the second threaded rods (9).

4. The valve gland type shockproof expansion joint according to claim 3, characterized in that: The upper end of the second threaded rod (9) is connected to the moving block (10), and the upper end of the moving block (10) is fixedly connected to the lower outer wall of the top cover (2).

5. The valve gland type shockproof expansion joint according to claim 1, characterized in that: The upper tube cover (4) is provided with a plurality of first threaded rods (7) arranged in a circumferential array. The upper tube cover (4) is connected to the lower tube cover (5) through the first threaded rods (7). Both ends of the first threaded rods (7) are provided with nuts (6).

6. The valve gland type anti-vibration expansion joint according to claim 1, characterized in that: The upper tube cap (4) is fitted onto the upper end of the sleeve (3), and the lower tube cap (5) is fitted onto the lower end of the sleeve (3).

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