Flexible connection compensator for heat supply ventilation pipeline

Abstract

The utility model relates to the technical field of connecting compensators, and discloses a flexible connecting compensator for a heat supply and ventilation pipeline, which comprises two connecting flanges which are arranged at an interval, an inner corrugated pipe is arranged between the two connecting flanges, the flexible connecting compensator further comprises a replacement assembly which is arranged on the outer circle wall surface of the connecting flanges, and the replacement assembly is arranged on the outer circle wall surface of the connecting flanges. Through mutual cooperative use of the connecting flange, the inner corrugated pipe, the spherical groove and the hoop, the inner corrugated pipe can be replaced, quick release connection is achieved through the connecting flange, the inner corrugated pipe and the hoop, the module can be independently replaced when local damage occurs, the maintenance cost is reduced, meanwhile, the ball head column can rotate in the spherical groove, and the service life of the ball head column is prolonged. And the graphite woven belt can expand when heated and is self-adaptive, so that the sealing is tighter at high temperature, the connecting flange and the connecting end are pushed to slightly displace by expansion, the mounting deviation is automatically compensated, and the graphite woven belt is more practical.

Description

Technical Field

[0001] This utility model relates to the field of connection compensator technology, and in particular to a flexible connection compensator for heating and ventilation ducts. Background Technology

[0002] Heating and ventilation ducts are networks of pipes that transport heat media (hot water, steam) or air in heating and air conditioning systems. They are widely used in building heating, industrial plant ventilation, and central air conditioning systems. Their core function is to achieve the effective transfer of heat energy or airflow, while meeting the requirements of temperature control, airflow organization, and safe operation. Flexible connection compensators are key components in heating and ventilation duct systems. They are used to absorb the expansion, contraction, bending, or displacement of pipes caused by temperature changes, vibration, or mechanical displacement, thereby reducing pipe stress, preventing interface leakage, and reducing operating noise.

[0003] An existing multi-layer furnace top air duct compensator (announcement number: CN208457427U) has at least the following drawbacks:

[0004] In the aforementioned patent, the installation of a rotating ring, a compression plate, and a connecting fixing plate can reinforce the pipe connection, making it more stable. However, since the above structure is integrated, if there is a problem with the flange or corrugated pipe section, the entire structure needs to be replaced, increasing the cost of use. Furthermore, the installation is done by connecting the flange ring with bolts. In actual construction, minor misalignments caused by factors such as foundation settlement and equipment vibration can trigger additional bending moments, forming periodic alternating stresses, which significantly reduces fatigue life. Therefore, it is necessary to propose a flexible connection compensator for heating and ventilation ducts to solve the above problems. Summary of the Invention

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a flexible connection compensator for heating and ventilation ducts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A flexible connection compensator for heating and ventilation ducts includes two connecting flanges spaced apart, with an inner bellows between the flanges. It also includes a replacement assembly disposed on the outer circular wall of the connecting flanges for replacing the connecting flanges and the inner bellows. The replacement assembly includes a connecting ring movably fitted onto the outer circular wall of the connecting flange, with a limiting groove formed on the outer circular wall of the connecting ring. A first limiting ring is fixedly fitted onto the outer circular wall of the connecting flange, and a clamp is movably fitted onto the outside of the first limiting ring, the clamp engaging with the limiting groove. Finally, a sealing assembly is used to seal the connecting ends of the connecting flanges.

[0008] As a further embodiment of this utility model, the sealing assembly includes: a first fixing groove, a main sealing ring being movably fitted inside the first fixing groove, the main sealing ring being filled with graphite braided tape, and the upper and lower sides of the main sealing ring having arc-shaped chamfers.

[0009] As a further embodiment of this utility model, a second fixing groove is provided on one side of the connecting flange, and a spherical groove is provided at one end of the inner side of the second fixing groove. A ball head is movably sleeved inside the spherical groove, and a thread is provided on the outer circular wall surface of the ball head. A second limiting ring is movably sleeved on the outer circular wall surface of the ball head.

[0010] As a further embodiment of this utility model, a fixing plate is fixedly installed on the outer circular wall surface of the ball head of the ball head column.

[0011] As a further embodiment of this utility model, an outer protective sleeve is fixedly installed on the outer circular wall surface of the inner corrugated pipe.

[0012] As a further embodiment of this utility model, a sealing groove is provided on the outer circular wall surface of the connecting flange, and a secondary sealing ring is movably sleeved inside the sealing groove, the interior of which is filled with graphite braided tape.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. By using the coordinated connection of the connecting flange, inner bellows, spherical groove, ball head column, graphite braided tape, and clamps, the inner bellows can be easily replaced. The quick-release connection via the connecting flange, inner bellows, and clamps allows for individual module replacement in case of partial damage, reducing maintenance costs. Simultaneously, the ball head column can rotate within the spherical groove, allowing for ±° deflection angles. Furthermore, the graphite braided tape expands upon heating, resulting in a tighter seal at high temperatures. The expansion also causes slight displacement of the connecting flange and connection end, automatically compensating for installation deviations, reducing cyclic alternating stress, and improving fatigue life, making it quite practical.

[0015] 2. The main sealing ring is V-shaped on the outside and has an arc-shaped chamfer, which allows the main sealing ring and the graphite braided tape to be squeezed and spread out, thereby improving the sealing coverage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a flexible connection compensator for heating and ventilation ducts proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the connecting flange structure of a flexible connection compensator for heating and ventilation ducts proposed in this utility model.

[0018] Figure 3 for Figure 2 A partial structural diagram of A in the middle;

[0019] Figure 4 This is a schematic diagram of the first limiting ring structure of a flexible connection compensator for heating and ventilation ducts proposed in this utility model.

[0020] In the diagram: 1. Connecting flange; 2. Inner bellows; 3. Outer protective sleeve; 4. Connecting ring; 5. Limiting groove; 6. First limiting ring; 7. Clamp; 8. Sealing groove; 9. Secondary sealing ring; 10. First fixing groove; 11. Main sealing ring; 12. Graphite braided tape; 13. Second fixing groove; 14. Spherical groove; 15. Second limiting ring; 16. Ball head column; 17. Fixing plate; 18. Chamfered corner. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Reference Figures 1-4A flexible connection compensator for heating and ventilation ducts includes two connecting flanges 1, spaced apart, with an inner bellows 2 between them. It also includes a replacement assembly, located on the outer circular wall of the connecting flanges 1, for replacing the connecting flanges 1 and the inner bellows 2. The replacement assembly includes a connecting ring 4, movably fitted onto the outer circular wall of the connecting flanges 1, with a limiting groove 5 on the outer circular wall of the connecting ring 4. A first limiting ring 6 is fixedly fitted onto the outer circular wall of the connecting flanges 1, and a clamp 7 is movably fitted onto the outside of the first limiting ring 6, engaging with the limiting groove 5. A sealing assembly is used to seal the connecting ends of the connecting flanges 1. The sealing assembly includes a first fixing groove 10, with a main sealing ring 11 movably fitted inside the first fixing groove 10, the main sealing ring 11 filled with graphite braided tape 12, and arc-shaped chamfers 18 on the upper and lower sides of the main sealing ring 11.

[0025] When in use, if it is necessary to disassemble the connecting flange 1 and the inner bellows 2, the connecting screws of the clamp 7 can be removed to remove the connecting ring 4, and the inner bellows 2 or the connecting flange 1 can be replaced. The compensator is divided into three modules: inner bellows 2, connecting ring 4, and connecting flange 1. The quick-release connection of the clamp 7 allows for individual module replacement in case of partial damage, reducing maintenance costs. The inner bellows 2 and the outer protective sleeve 3 form a multi-layer composite structure by alternating layers of metal bellows connecting flange 1 and non-metallic flexible layer (high-temperature resistant silicone inner bellows 2). The metal layer provides strength, and the non-metallic layer absorbs vibration, synergistically enhancing the axial, lateral, and angular compensation capabilities.

[0026] In this embodiment, a second fixing groove 13 is provided on one side of the connecting flange 1, and a spherical groove 14 is provided at one end of the inner side of the second fixing groove 13. A ball head post 16 is movably fitted inside the spherical groove 14. The outer circular wall surface of the ball head post 16 is threaded. A second limiting ring 15 is movably fitted on the outer circular wall surface of the ball head post 16. A fixing plate 17 is fixedly installed on the outer circular wall surface of the ball head post 16. An outer protective sleeve 3 is fixedly installed on the outer circular wall surface of the inner bellows 2. A sealing groove 8 is provided on the outer circular wall surface of the connecting flange 1. A secondary sealing ring 9 is movably fitted inside the sealing groove 8. The interior of the secondary sealing ring 9 is filled with graphite braided tape 12.

[0027] In use, the main sealing ring 11 is V-shaped on the outside and the arc chamfer 18 is arc-shaped, which allows the main sealing ring 11 and the graphite braided tape 12 to be spread out, thereby increasing the coverage of the sealing surface.

[0028] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0029] When the user needs to use the connecting flange 1 for flexible connection of the heating and ventilation duct, one end of the connecting flange 1 is connected to the duct. The ball head 16 is inserted into the ball groove 14 and the mounting hole at the installation position. The nut is then connected to the ball head 16. The fixing plate 17 is clamped with pliers to prevent the ball head 16 from rotating. The main sealing ring 11 and graphite braided tape 12 seal the connection between the connecting flange 1 and the installed duct. The graphite braided tape 12 expands when heated, and its self-adaptive expansion at high temperatures ensures a tighter seal and guarantees airtightness. To achieve a sealing effect, the connecting flange 1 is connected to the pipeline via the ball head 16. The ball head 16 can rotate within the spherical groove 14, allowing a deflection angle of ±15°, which enables automatic compensation for installation deviations and reduces stress concentration. Then, the connecting ring 4 is fitted onto the outside of the connecting flange 1, so that one end of the connecting ring 4 is attached to one side of the first limiting ring 6. The clamp 7 is then inserted into the limiting groove 5 and the outside of the first limiting ring 6, connecting the first limiting ring 6 and the connecting ring 4 through the clamp 7. The gap between the connecting ring 4 and the connecting flange 1 is sealed by the cooperation of the sealing groove 8 and the secondary sealing ring 9. The other end is installed in the same way. Furthermore, through the inner bellows 2 and the outer protective sleeve 3, a multi-layer composite structure is formed by alternating layers of metal bellows connecting flange 1 and non-metallic flexible layer (high-temperature resistant silicone inner bellows 2). The metal layer provides strength, and the non-metallic layer absorbs vibration, synergistically enhancing axial, lateral, and angular compensation capabilities. When it is necessary to disassemble the connecting flange 1 and the inner bellows 2, the connecting screws of the clamp 7 can be removed to remove the connecting ring 4, allowing the inner bellows 2 or the connecting flange 1 to be replaced. The compensator is divided into three modules: inner bellows 2, connecting ring 4, and connecting flange 1, which are quickly connected by the clamp 7, allowing for easy connection in case of localized damage. The module can be replaced individually, reducing maintenance costs. This allows for the replacement of both the connecting flange 1 and the inner bellows 2. The quick-release connection is achieved through the connecting flange 1, the inner bellows 2, and the clamp 7, enabling individual module replacement in case of partial damage, further reducing maintenance costs. Meanwhile, the ball head column 16 can rotate within the spherical groove 14, allowing a deflection angle of ±15°. Furthermore, the graphite braided tape 12 can expand when heated. Through adaptive thermal expansion, the seal becomes tighter at high temperatures. The expansion pushes the connecting flange 1 and the connecting end to slightly shift, automatically compensating for installation deviations, reducing cyclic alternating stress, and improving fatigue life, making it quite practical.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A flexible connection compensator for heating and ventilation ducts, comprising two connecting flanges (1), the two connecting flanges (1) being spaced apart, and an inner bellows (2) being provided between the two connecting flanges (1), characterized in that, Also includes: Replacement component, the replacement component is disposed on the outer circular wall of the connecting flange (1) for replacing the connecting flange (1) and the inner bellows (2), the replacement component includes: a connecting ring (4), the connecting ring (4) is movably sleeved on the outer circular wall of the connecting flange (1), the outer circular wall of the connecting ring (4) is provided with a limiting groove (5), the outer circular wall of the connecting flange (1) is fixedly sleeved with a first limiting ring (6), the outside of the first limiting ring (6) is movably sleeved with a clamp (7), the clamp (7) is movably sleeved with the limiting groove (5); A sealing assembly for sealing the connection end of the connecting flange (1).

2. The flexible connection compensator for heating and ventilation ducts according to claim 1, characterized in that, The sealing assembly includes: a first fixing groove (10), a main sealing ring (11) is movably sleeved inside the first fixing groove (10), the main sealing ring (11) is filled with graphite braided tape (12), and the upper and lower sides of the main sealing ring (11) are provided with arc-shaped chamfers (18).

3. The flexible connection compensator for heating and ventilation ducts according to claim 1, characterized in that, A second fixing groove (13) is provided on one side of the connecting flange (1), and a spherical groove (14) is provided at one end of the inner side of the second fixing groove (13). A ball head column (16) is movably sleeved inside the spherical groove (14). A thread is provided on the outer circular wall surface of the ball head column (16), and a second limiting ring (15) is movably sleeved on the outer circular wall surface of the ball head column (16).

4. A flexible connection compensator for heating and ventilation ducts according to claim 3, characterized in that, A fixing plate (17) is fixedly installed on the outer circular wall surface of the ball head of the ball head column (16).

5. A flexible connection compensator for heating and ventilation ducts according to claim 1, characterized in that, The outer protective sleeve (3) is fixedly installed on the outer circular wall surface of the inner corrugated pipe (2).

6. A flexible connection compensator for heating and ventilation ducts according to claim 1, characterized in that, The outer circular wall of the connecting flange (1) is provided with a sealing groove (8), and a secondary sealing ring (9) is movably sleeved inside the sealing groove (8), and the interior of the secondary sealing ring (9) is filled with graphite braided tape (12).

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