Bi-directional seal packing gland adjustment assembly

Abstract

This utility model relates to the field of valve technology, specifically to a bidirectional sealing packing gland adjustment assembly, including a valve body, a valve cover mounted on top of the valve body, and a valve shaft disposed within the valve body. The valve body has a packing cavity containing two symmetrical sealing elements, one above the other, which wrap around the valve shaft. A spring is positioned between the two sealing elements and wound around the valve shaft. A radial sealing element is located at the opening of the packing cavity to seal the valve shaft circumferentially. An axial sealing element is located between the valve body and the valve cover, pressing the radial sealing element tightly within the packing cavity. This utility model provides a bidirectional sealing effect, improving sealing performance and reducing leakage.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a bidirectional sealing packing gland adjustment assembly. Background Technology

[0002] Butterfly valves are a commonly used fluid control valve, widely applied in petroleum, chemical, water treatment, and municipal engineering fields. The valve shaft, as the core transmission component of the butterfly valve, directly affects its overall operational reliability and service life.

[0003] Utility model patent CN219639638U discloses a novel packing assembly for a regulating valve, belonging to the field of regulating valve technology. This novel packing assembly for a regulating valve includes: a spring, a packing liner, a composite combined bidirectional V-type packing assembly, a star-shaped sealing ring, a support gasket, an O-ring, a graphite guide sleeve, a packing gland, a packing pressure plate, a stud, a nut, and a washer. The composite combined bidirectional V-type packing assembly exhibits good self-lubricating performance, wear resistance, and a low coefficient of friction. It has strong tracking ability for eccentric loads and eccentric movements of the valve stem, resulting in strong sealing performance. It has a bidirectional sealing function, simultaneously solving the problem of leakage of positive pressure medium at the packing or air entering the valve body from the packing when there is negative pressure. The O-ring, graphite guide sleeve, and star-shaped sealing ring further enhance the sealing performance at the packing. A spring compensation is also included, which can generate continuous sealing force to compensate for packing loss and improve the service life of the packing.

[0004] While the aforementioned technical solutions offer corresponding advantages, current butterfly valve shafts on the market still exhibit some shortcomings in use. For instance, they mostly employ a unidirectional sealing structure, achieving sealing by applying pressure to the sealing packing through a packing gland. However, this traditional structure has significant drawbacks: firstly, the sealing pressure can only be adjusted in one direction, making it difficult to achieve bidirectional sealing of the valve shaft in both the radial and axial directions. Under high-pressure, high-viscosity fluid conditions, fluid leakage from the gap between the valve shaft and the valve body is prone to occur. Secondly, existing packing gland adjustment assemblies are mostly fixed structures, which can easily lead to uneven stress on the sealing packing during adjustment. This not only affects the sealing effect but also accelerates valve shaft wear, shortens the replacement cycle of the sealing packing and valve shaft, and increases equipment maintenance costs and downtime. Therefore, we propose a bidirectional sealing packing gland adjustment assembly. Utility Model Content

[0005] The purpose of this invention is to provide a bidirectional sealing packing gland adjustment assembly to address the deficiencies mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A bidirectional sealing packing gland adjusting assembly includes a valve body, a valve cover mounted on top of the valve body, and a valve shaft disposed within the valve body. The valve body contains a packing cavity, within which are two symmetrically positioned upper and lower sealing elements. These sealing elements wrap around the valve shaft. A spring is positioned between the two sealing elements and wound around the valve shaft. A radial sealing element is located at the opening of the packing cavity to seal the circumferential direction of the valve shaft. An axial sealing element is located between the valve body and the valve cover, pressing the radial sealing element tightly within the packing cavity.

[0007] Preferably, the valve cover is pressed against the axial seal, and the valve cover and the valve body are detachably connected by a plurality of fastening bolts; This feature facilitates the installation and removal of the valve cover.

[0008] Preferably, the radial seal includes a plug sleeve, which is plugged into the packing cavity, and the plug sleeve is sleeved on the valve shaft; This setting enables the insertion and assembly of the plug-in sleeve.

[0009] Preferably, a bottom rubber ring is fixedly installed on the bottom surface of the insertion sleeve, and an inner rubber fitting ring is fixedly installed on the inner annular side of the insertion sleeve, and the inner rubber fitting ring is sleeved on the valve shaft. This setting improves the sealing effect with the valve shaft.

[0010] Preferably, an upper pad is fixedly installed at the top end of the insertion sleeve, and the upper pad abuts against the top surface of the valve body; This setting enables the upper pad to be positioned to limit its movement, ensuring that the upper pad can be stably pressed against the valve body.

[0011] Preferably, the top surface of the upper pad is provided with an outer inclined surface, the axial seal includes an axial cover, the axial cover is pressed on the upper pad, and the inner surface of the axial cover is provided with an inner inclined surface, the inner inclined surface is attached to the outer inclined surface; This setting allows the upper pad to be pressed down, achieving a sealing operation from both axial and radial directions.

[0012] Preferably, a plurality of positioning protrusions are fixedly installed on the top surface of the axial pressure cover, and a plurality of positioning holes are provided on the bottom surface of the valve cover. The positioning protrusions are located in the positioning holes and are inserted into the positioning holes. This setting enables the axial gland to be positioned to limit its movement, preventing any displacement of the axial gland.

[0013] Preferably, the sealing element includes a lower sealing ring and an upper sealing ring, and a central rubber ring is provided between the lower sealing ring and the upper sealing ring. The lower sealing ring, the upper sealing ring and the central rubber ring are all sleeved on the valve shaft, and the bottom of the bottom rubber ring and the bottom of the inner rubber contact ring abut against the top surface of the upper sealing ring located above. This setting can further improve the sealing effect between the valve shaft and the valve.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model achieves bidirectional sealing of the valve shaft in both the radial and axial directions by setting up a combination structure of symmetrical upper and lower sealing elements, radial sealing elements, and axial sealing elements, combined with the spring in the packing cavity and the inclined surface fit design of the axial pressure cover and the upper pad block. This structure no longer relies on the traditional single-direction sealing method and can seal the circumferential and axial gaps of the valve shaft at the same time, effectively solving the problem of fluid leakage from the gap between the valve shaft and the valve body under high pressure and high viscosity fluid conditions, thereby improving the overall sealing performance and operational reliability of the butterfly valve.

[0015] 2. This utility model achieves precise positioning and stable assembly of all components by using multiple fastening bolts to detachably connect the valve cover and valve body, and by inserting a positioning protrusion at the top of the axial gland into the positioning hole at the bottom of the valve cover. Simultaneously, the radial seal employs an insert sleeve that connects to the packing cavity, and an inner rubber fitting ring that fits against the valve shaft. This design avoids the uneven stress on the sealing packing during adjustment in existing fixed structures, ensuring that the sealing pressure is evenly transmitted to all sealing parts. This reduces wear on the valve shaft caused by excessive local stress, thereby extending the service life of the sealing packing and valve shaft, and reducing equipment maintenance costs.

[0016] 3. This utility model achieves continuous pressure compensation and tight sealing by incorporating a spring wound around the valve shaft between the upper and lower seals, and a bottom rubber ring at the bottom of the radial seal to abut against the upper seal. This is achieved through the elastic compensation of the spring and the elastic contact characteristics of the rubber ring. Even with slight wear on the seals during long-term use, the spring provides continuous pressure to maintain the seal's contact, and the rubber ring adapts to minor valve shaft displacements to compensate for seal failure. This reduces the risk of seal failure and lowers the frequency of downtime maintenance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the sealing element of this utility model; The meanings of the labels in the diagram are as follows: 1. Valve body; 10. Valve cover; 11. Valve shaft; 12. Packing chamber; 13. Locating hole; 14. Fastening bolts; 2. Sealing element; 20. Lower sealing ring; 21. Central rubber ring; 22. Upper sealing ring; 3. Spring; 4. Radial seal; 40. Insert sleeve; 41. Bottom rubber ring; 42. Inner rubber fitting ring; 43. Upper pad; 44. Outer bevel; 5. Axial seal; 50. Axial gland; 51. Inner bevel; 52. Positioning protrusion. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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. Please see Figures 1-3 This utility model provides a technical solution: a bidirectional sealing packing gland adjustment assembly, including a valve body 1, a valve cover 10 installed on the top of the valve body 1, and a valve shaft 11 disposed within the valve body 1. A packing cavity 12 is provided within the valve body 1, and two symmetrically arranged sealing elements 2 are disposed within the packing cavity 12. The sealing elements 2 wrap around the valve shaft 11, and a spring 3 is disposed between the two sealing elements 2, wound around the valve shaft 11. A radial sealing element 4 is provided at the opening of the packing cavity 12 for sealing the circumferential direction of the valve shaft 11. An axial seal 5 is provided between the body 1 and the valve cover 10. The axial seal 5 presses the radial seal 4 into the packing cavity 12, so that the packing cavity 12 provides installation space for the seal 2, the spring 3 and the radial seal 4. The seal 2 wraps around the valve shaft 11 to achieve initial sealing. The spring 3 can apply continuous pressure to the seal 2 to compensate for sealing loss. The radial seal 4 provides circumferential sealing for the valve shaft 11. The axial seal 5 presses the radial seal 4 to achieve synchronous axial and radial sealing, forming a multi-dimensional sealing system, which effectively improves the sealing reliability of the valve shaft 11.

[0019] In this embodiment, the valve cover 10 is pressed against the axial seal 5. The valve cover 10 and the valve body 1 are detachably connected by multiple fastening bolts 14. When it is necessary to maintain or replace the internal sealing components, the valve cover 10 can be removed simply by removing the fastening bolts 14. This operation is convenient and greatly reduces the maintenance difficulty and time cost of the components.

[0020] Specifically, the radial seal 4 includes a plug sleeve 40, which is plugged into the packing cavity 12. The plug sleeve 40 is fitted onto the valve shaft 11. This structure not only facilitates the rapid positioning and installation of the radial seal 4 in the packing cavity 12, but also ensures the stability of the relative position between the plug sleeve 40 and the valve shaft 11 and the packing cavity 12, laying the foundation for subsequent sealing.

[0021] Furthermore, a bottom rubber ring 41 is fixedly installed on the bottom surface of the insert sleeve 40, and an inner rubber fitting ring 42 is fixedly installed on the inner annular side of the insert sleeve 40. The inner rubber fitting ring 42 is sleeved on the valve shaft 11. The rubber material has good elasticity and sealing properties, which can fill the tiny gaps between the insert sleeve 40 and the packing cavity 12 and the valve shaft 11, further improving the sealing effect between the radial seal 4 and the valve shaft 11 and the packing cavity 12.

[0022] In addition, an upper pad 43 is fixedly installed at the top of the insert sleeve 40. The upper pad 43 abuts against the top surface of the valve body 1, which can limit the installation position of the insert sleeve 40 in the packing cavity 12, prevent the insert sleeve 40 from shifting downward under force or during use, and ensure the stability of the sealing position of the radial seal 4.

[0023] like Figure 1 and Figure 2 As shown, an outer inclined surface 44 is provided on the top surface of the upper pad 43. The axial seal 5 includes an axial cover 50, which is pressed against the upper pad 43. An inner inclined surface 51 is provided on the inner surface of the axial cover 50, which fits against the outer inclined surface 44. The axial pressure is converted into a radial extrusion force on the radial seal 4, which not only achieves axial compression of the radial seal 4, but also enhances its radial sealing force with the valve shaft 11 and the packing cavity 12, thus achieving bidirectional compression sealing.

[0024] In addition, multiple positioning protrusions 52 are fixedly installed on the top surface of the axial cover 50, and multiple positioning holes 13 are provided on the bottom surface of the valve cover 10. The positioning protrusions 52 are located in the positioning holes 13 and are inserted into the positioning holes 13, which can accurately limit the position of the axial cover 50 between the valve cover 10 and the valve body 1, avoid the horizontal positional deviation of the axial cover 50 during installation or use, and ensure that the clamping force of the axial cover 50 on the radial seal 4 is uniformly transmitted.

[0025] It is worth noting that the sealing element 2 includes a lower sealing ring 20 and an upper sealing ring 22. A central rubber ring 21 is provided between the lower sealing ring 20 and the upper sealing ring 22. The lower sealing ring 20, the upper sealing ring 22 and the central rubber ring 21 are all fitted on the valve shaft 11. The bottom of the bottom rubber ring 41 and the bottom of the inner rubber fitting ring 42 abut against the top surface of the upper sealing ring 22. The elasticity of the central rubber ring 21 can enhance the fit between the sealing ring and the valve shaft 11. At the same time, the bottom of the bottom rubber ring 41 and the bottom of the inner rubber fitting ring 42 abut against the upper sealing ring 22, forming a sealing relay, which further fills the sealing gap between the valve shaft 11 and the packing cavity 12 and improves the overall sealing performance.

[0026] When using the bidirectional sealing packing gland adjustment assembly of this utility model, first, the upper and lower sealing parts 2 are placed on the outside of the valve shaft 11, so that the lower sealing ring 20, the central rubber ring 21, and the upper sealing ring 22 are in sequence. Then, the spring 3 is wound around the valve shaft 11 and placed between the two sealing parts 2. Then, the assembled valve shaft 11 and sealing components are installed into the packing cavity 12 of the valve body 1. Next, the insertion sleeve 40 of the radial sealing part 4 is placed on the valve shaft 11, so that it is inserted and matched with the packing cavity 12, ensuring that the bottom rubber ring 41 and the inner rubber fitting ring 42 are respectively in contact with the inner wall of the packing cavity 12 and the valve shaft 11. Then, the axial gland 50 of the axial sealing part 5 is placed on the valve shaft 11, so that the inner inclined surface 51 is in contact with the outer inclined surface 44 of the upper pad 43. Finally, the valve cover 10 is covered, so that the positioning protrusion 52 is inserted into the positioning hole 13, and the valve cover 10 is fixed to the valve body 1 with the fastening bolt 14. When the equipment is running, the axial pressure cover 50 presses the upper pad 43 under the pressure of the valve cover 10, converting the axial pressure into radial extrusion force, so that the radial seal 4 fits tightly against the valve shaft 11 and the packing cavity 12; the seal 2 wraps around the valve shaft 11 to achieve a preliminary seal, and the spring 3 continuously applies pressure to the seal 2 to compensate for the sealing loss, forming a multi-dimensional seal and ensuring that the valve shaft 11 operates without leakage. When maintenance is required, remove the fastening bolt 14 to take off the valve cover 10, remove the axial gland 50 and radial seal 4, and replace the worn seal 2, spring 3 or radial seal 4. After replacement, reassemble according to the installation procedure.

[0027] 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 preferred examples and are not intended to limit the 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. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A bidirectional sealing packing gland adjusting assembly, comprising a valve body (1), a valve cover (10) mounted on top of the valve body (1), and a valve shaft (11) disposed within the valve body (1), characterized in that: The valve body (1) is provided with a packing cavity (12), and two symmetrical seals (2) are provided in the packing cavity (12). The seals (2) are wrapped around the valve shaft (11). A spring (3) is provided between the two seals (2). The spring (3) is wound around the valve shaft (11). A radial seal (4) is provided at the opening of the packing cavity (12) for sealing the circumferential direction of the valve shaft (11). An axial seal (5) is provided between the valve body (1) and the valve cover (10). The axial seal (5) presses the radial seal (4) into the packing cavity (12).

2. The bi-directional, sealed packing gland adjustment assembly of claim 1, wherein: The valve cover (10) is pressed against the axial seal (5), and the valve cover (10) and the valve body (1) are detachably connected by a plurality of fastening bolts (14).

3. The bi-directional, sealed, packing gland adjustment assembly of claim 1, wherein: The radial seal (4) includes a plug sleeve (40) which is plugged into the packing cavity (12) and is sleeved on the valve shaft (11).

4. The bi-directional, sealed packing gland adjustment assembly of claim 3, wherein: A bottom rubber ring (41) is fixedly installed on the bottom surface of the plug sleeve (40), and an inner rubber fitting ring (42) is fixedly installed on the inner annular side of the plug sleeve (40). The inner rubber fitting ring (42) is sleeved on the valve shaft (11).

5. The bi-directional, sealed packing gland adjustment assembly of claim 4, wherein: The top end of the plug sleeve (40) is fixedly installed with an upper pad (43), which abuts against the top surface of the valve body (1).

6. The bi-directional, sealed packing gland adjustment assembly of claim 5, wherein: The top surface of the upper pad (43) is provided with an outer inclined surface (44), and the axial seal (5) includes an axial cover (50). The axial cover (50) is pressed on the upper pad (43). The inner surface of the axial cover (50) is provided with an inner inclined surface (51), and the inner inclined surface (51) is attached to the outer inclined surface (44).

7. The bi-directional, sealed packing gland adjustment assembly of claim 6, wherein: Multiple positioning protrusions (52) are fixedly installed on the top surface of the axial pressure cover (50), and multiple positioning holes (13) are provided on the bottom surface of the valve cover (10). The positioning protrusions (52) are located in the positioning holes (13) and are inserted into the positioning holes (13).

8. The bi-directional, sealed packing gland adjustment assembly of claim 4, wherein: The sealing element (2) includes a lower sealing ring (20) and an upper sealing ring (22). A central rubber ring (21) is provided between the lower sealing ring (20) and the upper sealing ring (22). The lower sealing ring (20), the upper sealing ring (22) and the central rubber ring (21) are all sleeved on the valve shaft (11). The bottom of the bottom rubber ring (41) and the bottom of the inner rubber fitting ring (42) abut against the top surface of the upper sealing ring (22) located above.

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