A pump body sealing mechanism

Abstract

The utility model discloses a pump body sealing mechanism relates to mixed flow pump manufacturing technical field. The utility model provides a pump body sealing mechanism, including the flange plate of fixed connection on the pump shell or pipeline, the recess is seted up to one side of flange plate, and the recess is clamped with the sealing ring, still includes: a plurality of annular array floating connection structure on the flange plate, and the floating connection structure drives two flange plates to extrude each other, and the floating connection structure floats on the flange plate, and automatically changes the pre -tightening force between two flange plates, when the eccentric load between flange plate happens under the action of external force, and the floating connection structure follows its floating, and make the flange plate keep close contact between, after the disappearance of external force, and the floating connection structure drives two flange plates to return to the original position.

Description

Technical Field

[0001] This utility model relates to the field of mixed-flow pump manufacturing technology, specifically to a pump body sealing mechanism. Background Technology

[0002] In the field of pump sealing mechanisms, flange connections are widely used to fix two components of a pump casing or pipeline together, and apply preload through bolts to ensure sealing performance. However, in actual operation, due to factors such as pump vibration, thermal expansion differences, and shaft misalignment, uneven loading or relative displacement often occurs between flanges. Traditional flange connections typically employ rigid fastening methods, relying on fixing bolts to provide a constant preload. While this design is simple, it has significant limitations under dynamic loads. For example, when a flange tilts or misaligns due to external forces, the original preload distribution becomes uneven, leading to excessive or insufficient local pressure on the sealing ring, thus increasing the risk of leakage. Furthermore, once the external load disappears, the flange is difficult to return to its initial state, resulting in unstable sealing pressure and affecting sealing reliability and service life. Utility Model Content

[0003] The purpose of this invention is to provide a pump body sealing mechanism to address the aforementioned shortcomings in the prior art.

[0004] To achieve the above objectives, this embodiment provides the following technical solution: a pump body sealing mechanism, including a flange fixedly connected to a pump casing or pipeline, a groove being provided on one side of the flange, a sealing ring being engaged in the groove, and further comprising:

[0005] A floating connection structure consisting of several annular arrays on a flange. The floating connection structure causes the two flanges to press against each other. The floating connection structure floats on the flange and automatically changes the preload between the two flanges. When an off-center load occurs between the flanges under the action of an external force, the floating connection structure floats with it and keeps the flanges in close contact. After the external force disappears, the floating connection structure causes the two flanges to return to their original positions.

[0006] Preferably, the side wall of the flange is provided with several connection holes, and the floating connection structure includes bolts that pass through the connection holes. One end of the bolt is connected to a nut by thread. By rotating the bolt and the nut, the two flanges are brought closer to each other.

[0007] Preferably, an intermediate seat is provided between the nut and the flange, and a spring is provided between the intermediate seat and the nut.

[0008] Preferably, two pairs of washers and swivels are provided between the bolt and the intermediate seat, with each pair of washers and swivels located on the opposite side of the two flanges.

[0009] Preferably, several steel balls are embedded in the side wall of the rotating ring, and the washer ring is in contact with the steel balls.

[0010] Preferably, a second guide sleeve is fixedly connected to the side of the intermediate seat near the nut, and a first guide sleeve is fixedly connected to the side of the nut near the intermediate seat. The first guide sleeve is inserted into the inside of the second guide sleeve, and a spring is disposed between the first guide sleeve and the second guide sleeve.

[0011] Preferably, the second guide sleeve is internally fixedly connected to a sliding guide sleeve, and the bolt passes through the sliding guide sleeve and the spring to connect with the nut.

[0012] The pump body sealing mechanism provided by this utility model has the following beneficial effects as described above:

[0013] 1. By setting a floating connection structure, the sealing preload between the flanges can be automatically adjusted. This floating connection structure can float with the flanges when they undergo relative displacement or off-center loading, thereby dynamically adjusting the pressure applied between the flanges and ensuring that the sealing ring is always in an effective compressed state. This structural design not only improves the adaptability of the sealing mechanism to complex working conditions, but also effectively avoids the sealing failure caused by external forces, enhancing the stability and reliability of the sealing system. At the same time, after the external force disappears, the floating connection structure can also drive the flanges to return to their initial position, further improving the self-resetting capability and service life of the sealing mechanism.

[0014] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0015] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0018] Figure 2 This is a partial structural diagram of the overall structure provided in an embodiment of the present utility model;

[0019] Figure 3 This is a partial structural cross-sectional view of the overall structure provided in an embodiment of the present utility model;

[0020] Figure 4 An exploded view of the floating connection structure provided in an embodiment of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Floating connection structure; 11. Bolt; 12. Nut; 13. Intermediate seat; 14. Spring; 15. Washer; 16. Rotary ring; 17. First guide sleeve; 18. Second guide sleeve; 19. Sliding guide sleeve;

[0023] 2. Flange. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0025] Please see Figure 1-4 This embodiment provides a pump body sealing mechanism, including a flange 2 fixedly connected to the pump casing or pipeline of a mixed-flow pump. The flange 2 is used to connect two components of the pump body or pipeline to each other, and a pre-tightening force is applied by fasteners such as bolts 11. To ensure sealing performance, a groove is provided on one side of the flange 2, which is used to embed and install a sealing ring. The sealing ring plays a role in preventing liquid leakage. The mechanism also includes:

[0026] The floating connection structure 1, consisting of several annular arrays on the flange 2, helps ensure uniform stress distribution and improves sealing stability. The floating connection structure 1 causes the two flanges 2 to press against each other, thus applying sufficient preload to the sealing ring and enhancing the sealing effect. The floating connection structure 1 floats on the flanges 2 and automatically changes the preload between them. It has a certain amount of space to move freely within a certain range on the surface of the flanges 2. When external load changes cause misalignment between the flanges 2, the floating connection structure 1 floats accordingly, automatically adjusting the pressure applied between them to maintain the effective compression of the sealing ring. When the system is subjected to vibration, thermal expansion, or other external forces during operation, asymmetrical deformation or misalignment may occur between the flanges 2. In this case, the guide component in the floating connection structure 1 can guide it to move accordingly with the movement of the flanges 2, thereby maintaining the fit between the two flanges 2 and preventing sealing failure due to uneven loading. After the external load is removed, the floating connection structure 1 provides a restoring force, allowing the flanges 2 to return to their initial position. This characteristic not only improves the system's adaptability but also enhances the stability and service life of the sealing mechanism.

[0027] Please see Figure 2-4 The flange 2 has several connection holes on its side wall. The floating connection structure 1 includes bolts 11 that pass through the connection holes. The bolts 11 pass through the corresponding connection holes on the two flanges 2 in sequence, and nuts 12 are screwed into their ends to form an adjustable fastening connection structure. When the nuts 12 are rotated, the nuts 12 are pushed along the threads of the bolts 11, which drives the two flanges 2 to gradually approach each other, thereby compressing the middle sealing ring and applying the initial sealing preload.

[0028] Please see Figure 2-4 The intermediate seat 13 is fitted onto the bolt 11 and located between the nut 12 and the flange 2. The spring 14 is installed between the intermediate seat 13 and the nut 12 as an elastic element to store and release preload. When the nut 12 is rotated, the nut 12 moves axially along the bolt 11 and pushes the spring 14, causing the spring 14 to be compressed and act on the intermediate seat 13. The intermediate seat 13 transmits the pressure to the flange 2, thereby bringing the two flanges 2 closer together and pressing the sealing ring to form an effective initial sealing state. During operation, if the flanges 2 are displaced relative to each other due to vibration, temperature changes, etc., resulting in an increase in the distance between them, the intermediate seat 13 will move with the flanges 2 and compress the spring 14 in the opposite direction. During this process, the spring 14 absorbs the deformation and maintains a certain residual preload to prevent seal failure.

[0029] Please see Figure 2-4The gasket 15 and the swivel ring 16 are arranged in pairs and are located on the outer end faces of the two flanges 2 respectively. The gasket 15 is used to evenly transmit pressure and prevent stress concentration on the surface of the flange 2. The swivel ring 16 has a certain degree of rotational freedom and can adapt to the slight offset between the flanges 2. Because the swivel ring 16 has a certain degree of rotational freedom, it can rotate with the flange 2 when it deflects slightly, avoiding stress concentration caused by rigid constraints. The gasket 15 plays the role of buffering and distributing pressure, making the flange 2 more evenly stressed, thereby improving the sealing performance and structural life.

[0030] Please see Figure 2-4 Several steel balls are embedded in the side wall of the swivel ring 16. The gasket 15 contacts the steel balls and forms a rolling contact relationship, which constitutes a low-friction, sliding support structure. When the flange 2 is subjected to asymmetrical force or axial misalignment, the gasket 15 will be subjected to uneven pressure. At this time, due to the presence of steel balls, the gasket 15 can deflect or slide on the swivel ring 16 to a certain extent, thereby adapting to the relative displacement between the flanges 2.

[0031] Please see Figure 4 A second guide sleeve 18 is fixedly connected to the side of the intermediate seat 13 near the nut 12, and a first guide sleeve 17 is fixedly connected to the side of the nut 12 near the intermediate seat 13. The first guide sleeve 17 is inserted into the inside of the second guide sleeve 18 to form a nested fit. The spring 14 is disposed between the first guide sleeve 17 and the second guide sleeve 18. During the compression of the spring 14, the first guide sleeve 17 and the second guide sleeve 18 restrict the lateral displacement of the spring 14 through their coaxial nested structure, ensuring that it is always subjected to force along the axial direction. At the same time, the guide sleeve can also prevent external impurities from entering the area of ​​the spring 14 and reduce friction interference between the spring 14 and surrounding components, thereby improving the stability and service life of the overall structure.

[0032] Please see Figure 4 The second guide sleeve 18 is internally fixedly connected to a sliding guide sleeve 19. The sliding guide sleeve 19 has a through hole in its center. The bolt 11 passes through the sliding guide sleeve 19 and the spring 14 and is connected to the nut 12 to form a complete floating connection structure 1. The sliding guide sleeve 19 restricts the bolt 11 from deflecting during the force process through the fit between its inner wall and the outer surface of the bolt 11, ensuring that it always moves in the axial direction. This guiding effect not only improves the stability of the entire floating connection structure 1, but also effectively prevents the sealing failure problem caused by eccentric load. At the same time, the sliding guide sleeve 19 also provides a certain support force for the bolt 11, enhancing the overall rigidity and deformation resistance of the structure.

[0033] In use, two flanges 2 are fixedly connected to the pump casing or pipeline of the mixed flow pump, and a sealing ring is provided between their contact surfaces to achieve initial sealing. Multiple floating connection structures 1 are arranged in a ring around the flanges 2. Each floating connection structure 1 includes a bolt 11 that passes through the connection hole of the flange 2 and a nut 12 that mates with it. By rotating the nut 12, the intermediate seat 13 can be moved and the spring 14 can be compressed, so that the spring 14 applies a preload to the flange 2, thereby pressing the sealing ring. When the flange 2 is subjected to an off-center load due to vibration, thermal expansion or installation error during system operation, the rotating ring 16 and the washer 15 in the floating connection structure 1 slide relative to each other through the steel balls embedded in the rotating ring 16, adapting to the displacement changes between the flanges 2, while continuing to effectively compress the flanges 2. After the external force disappears, the spring 14 releases its elastic potential energy, pushes the intermediate seat 13 to reset, thereby driving the flange 2 back to its original position, realizing the automatic reset function of the sealing structure.

[0034] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pump body sealing mechanism, comprising a flange (2) fixedly connected to a pump casing or pipeline, wherein a groove is provided on one side of the flange (2), and a sealing ring is engaged in the groove, further comprising: Several ring arrays of floating connection structures (1) on flange (2) cause two flanges (2) to press against each other. The floating connection structure (1) floats on flange (2) and automatically changes the preload between the two flanges (2). When an off-center load occurs between flanges (2) under the action of external force, the floating connection structure (1) floats with it and keeps the flanges (2) in close contact. After the external force disappears, the floating connection structure (1) causes the two flanges (2) to return to their original positions.

2. The pump body sealing mechanism according to claim 1, characterized in that, Several connection holes are provided on the side wall of the flange (2). The floating connection structure (1) includes a bolt (11) that passes through the connection hole. One end of the bolt (11) is connected to a nut (12) by thread. By rotating the bolt (11) and the nut (12), the two flanges (2) are brought closer to each other.

3. The pump body sealing mechanism according to claim 2, characterized in that, An intermediate seat (13) is provided between the nut (12) and the flange (2), and a spring (14) is provided between the intermediate seat (13) and the nut (12).

4. A pump body sealing mechanism according to claim 3, characterized in that, Two pairs of washers (15) and swivels (16) are provided between the bolt (11) and the intermediate seat (13), with each pair of washers (15) and swivels (16) located on the side of the two flanges (2) that are far apart from each other.

5. A pump body sealing mechanism according to claim 4, characterized in that, Several steel balls are embedded in the side wall of the swivel ring (16), and the pad ring (15) is in contact with the steel balls.

6. A pump body sealing mechanism according to claim 3, characterized in that, A second guide sleeve (18) is fixedly connected to the side of the intermediate seat (13) near the nut (12), and a first guide sleeve (17) is fixedly connected to the side of the nut (12) near the intermediate seat (13). The first guide sleeve (17) is inserted into the inside of the second guide sleeve (18), and a spring (14) is set between the first guide sleeve (17) and the second guide sleeve (18).

7. A pump body sealing mechanism according to claim 6, characterized in that, The second guide sleeve (18) is internally fixedly connected to a sliding guide sleeve (19), and a bolt (11) passes through the sliding guide sleeve (19) and a spring (14) to connect with a nut (12).

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