Stuffing box seal

Abstract

The utility model discloses a kind of packing seal structure, including first packing seat, with first through-hole, first packing and second packing, first packing and second packing are attached to the inner wall surface of first through-hole, and are sequentially connected in succession along the extension direction of first through-hole;Cylinder, around the outer periphery of first packing seat, and form cold water cavity between the outer wall surface of first packing seat;Second packing seat, one end is embedded in first through-hole and is pressed and placed in second packing, with the second through-hole that is connected with the section shape of first through-hole, the third packing that is attached to the inner wall surface of second through-hole;Ring, one end is embedded in second through-hole and is pressed and placed in third packing, with the third through-hole that is connected with the section shape of second through-hole.The packing seal structure is set by setting cold water cavity, can be actively cooled and export packing friction heat;Simultaneously, double-layer packing seal structure is set in first packing seat and cooperates, can guarantee sealing reliability, and can be applied to complex working condition.

Description

Technical Field

[0001] This utility model relates to the field of sealing structures, specifically a packing sealing structure. Background Technology

[0002] Traditional plunger pumps and other equipment widely use single-packing seal structures for dynamic sealing, which mainly rely on a single main packing assembly to achieve the sealing function. However, a single packing seal design is difficult to meet the comprehensive requirements of diverse and complex working conditions such as corrosion resistance, high pressure resistance, high temperature resistance and hygiene standards. Especially in fields involving acid and alkali corrosion or hygiene and safety, the limitations of a single material can easily lead to seal failure.

[0003] Meanwhile, during equipment manufacturing, the packing is easily worn, affecting sealing performance. Current technologies generally extend packing life by improving plunger surface finish and using wear-resistant materials, but the entire sealing system generally lacks an active lubrication or cooling circulation mechanism. This results in the packing and moving plunger being in a state of dry friction for extended periods. The large amount of heat generated by this friction cannot be effectively dissipated and easily accumulates rapidly in the packing area, accelerating not only the wear of the packing itself but also increasing the risk of seal failure.

[0004] To address the aforementioned frictional temperature rise issue, existing solutions largely rely on passive cooling measures such as external heat sinks or natural convection. However, these methods have low heat dissipation efficiency and cannot achieve rapid, active removal of frictional heat. The continuous high temperature within the packing structure will lead to overheating, softening, and aging of the material, thereby affecting the reliability and service life of the seal. Utility Model Content

[0005] To address the above issues, this utility model provides a packing seal structure that can cool the packing, ensuring its service life and sealing stability; it also provides a double-layer packing seal, effectively enhancing sealing reliability and improving applicability under complex working conditions.

[0006] The present invention provides a packing sealing structure, including a first packing seat, having a first through hole, a first packing and a second packing, the first packing and the second packing being attached to the inner wall surface of the first through hole and arranged sequentially along the extension direction of the first through hole.

[0007] The cylindrical body surrounds the outer periphery of the first packing seat and forms a cold water cavity with the outer wall surface of the first packing seat;

[0008] The second packing seat has one end embedded in the first through hole of the first packing seat and pressed onto the second packing. It has a second through hole that is connected to the cross-sectional shape of the first through hole. The second packing seat also includes a third packing, which is attached to the inner wall surface of the second through hole.

[0009] The pressure ring, one end of which is embedded in the second through hole of the second packing seat and pressed onto the third packing, has a third through hole that is connected to the cross-sectional shape of the second through hole.

[0010] According to the above technical solution, during use, the shaft parts are inserted into the first, second, and third through holes respectively, and are fitted together with the first, second, and third packings. By providing a cold water chamber outside the first packing seat, active cooling is achieved. The cold water in the chamber dissipates the heat generated by friction between the shaft parts and the first and second packings, preventing seal failure due to high-temperature friction wear, thus ensuring the sealing performance and service life of the first and second packings. Simultaneously, the first and second packings form a double-layer packing seal structure, synergistically enhancing sealing reliability. The third packing further strengthens sealing reliability. Furthermore, by controlling the materials of the first and second packings, the application can be extended to complex working conditions such as high pressure, corrosion, and hygiene sensitivity.

[0011] Optionally, the cold water chamber is connected to an inlet pipe and an outlet pipe.

[0012] According to the above technical solution, the heat-exchanged water can be drawn out through the inlet pipe and the cold water can be introduced into the cold water chamber, so as to realize the active circulation and heat dissipation of the cold water in the cold water chamber, thereby ensuring the cooling effect on the first packing and the second packing.

[0013] Optionally, a bushing is also fitted onto the inner wall surface of the pressure ring.

[0014] According to the above technical solution, after the shaft parts are inserted, the bushing fits against the outer circumferential surface of the shaft parts. The bushing can reduce the frictional loss between the inner wall of the pressure ring and the shaft parts, thereby reducing the problem of the expansion of the fitting clearance caused by wear, thus extending the overall service life of the packing seal structure and ensuring long-term operational stability.

[0015] Optionally, the bushing is a tin bronze alloy bushing.

[0016] According to the above technical solution, by using a tin bronze alloy bushing with high strength, high wear resistance and corrosion resistance, the inner wall of the pressure ring can be more effectively prevented from being worn by shaft parts.

[0017] Optionally, the length of the second packing along the extension direction of the first through hole is four times that of the first packing.

[0018] The above technical solution effectively ensures the reliability of the seal.

[0019] Optionally, the first packing is corrosion-resistant polytetrafluoroethylene packing, the second packing is food-grade polytetrafluoroethylene packing, and the third packing is food-grade polytetrafluoroethylene packing.

[0020] According to the above technical solution, the first packing located at the port of the first packing seat is a corrosion-resistant polytetrafluoroethylene (PTFE) packing, which can maintain chemical stability in acidic and alkaline corrosive environments, preventing the sealing material from being corroded and failing. Meanwhile, the second packing is a food-grade PTFE packing, meeting hygiene requirements and ensuring both sealing performance and hygiene safety. The synergy between the first and second packings effectively enhances sealing reliability and allows for wider application in complex working conditions such as high pressure, corrosion, and hygiene sensitivity. Furthermore, the third packing is a food-grade PTFE packing, further ensuring sealing reliability while meeting hygiene and safety requirements.

[0021] Optionally, the second packing seat is connected to the first packing seat by a first double-ended stud and a first nut, and the pressure ring is connected to the second packing seat by a second double-ended stud and a second nut.

[0022] According to the above technical solution, assembly can be completed quickly and segmented maintenance is convenient; at the same time, it can ensure that the second packing seat and the pressure ring axially press the first packing, the second packing and the third packing to ensure sealing reliability.

[0023] Optionally, the first packing seat is also provided with a third double-ended stud and a third nut for fixing the first packing seat to the external mounting surface.

[0024] According to the above technical solution, it is convenient to assemble and fix the packing sealing structure during production. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the packing sealing structure in an embodiment of this utility model.

[0026] Reference numerals: 100 for packing seal structure, 10 for first packing seat, 11 for first through hole, 12 for first packing, 13 for second packing, 20 for cylinder, 21 for cold water chamber, 22 for inlet pipe, 23 for outlet pipe, 30 for second packing seat, 31 for second through hole, 32 for third packing, 40 for pressure ring, 41 for third through hole, 42 for bushing, 51 for first double-ended stud, 52 for first nut, 53 for second double-ended stud, 54 for second nut, 55 for third double-ended stud, 56 for third nut. Detailed Implementation

[0027] 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.

[0028] refer to Figure 1 The packing sealing structure 100 in this embodiment includes a first packing seat 10, a cylinder 20, a second packing seat 30, and a pressure ring 40.

[0029] The first packing seat 10 has a first through hole 11, a first packing 12 and a second packing 13. The first packing 12 and the second packing 13 are attached to the inner wall surface of the first through hole 11 and are arranged sequentially along the extension direction of the first through hole 11.

[0030] The cylinder 20 surrounds the outer periphery of the first packing seat 10 and forms a cold water cavity 21 between it and the outer wall surface of the first packing seat 10.

[0031] One end of the second packing seat 30 is embedded in the first through hole 11 of the first packing seat 10 and pressed onto the second packing 13. It has a second through hole 31 that is connected to the first through hole 11 in a cross-sectional shape. The second packing seat 30 also includes a third packing 32, which is attached to the inner wall surface of the second through hole 31.

[0032] One end of the pressure ring 40 is embedded in the second through hole 31 of the second packing seat 30 and pressed onto the third packing 32, having a third through hole 41 that is connected to the cross-sectional shape of the second through hole 31.

[0033] Specifically, in actual production, shaft-like parts (not shown in the figure), such as plungers and valve stems, are inserted and installed in the first through hole 11, the second through hole 31, and the third through hole 41. The specific shaft-like parts can be set according to the actual production requirements, and no specific limitation is made here.

[0034] After the shaft-like parts are inserted and assembled into the packing seal structure 100, the outer circumferential surface of the shaft-like parts will be in close contact with the first packing 12, the second packing 13, and the third packing 32. At this time, the bottom surface of the first packing 12 is supported by the bottom protruding end of the first packing seat 10, and is pressed axially against the second packing 13 by the second packing seat 30, so that the first packing 12 and the second packing 13 are compressed axially. At the same time, the first packing 12 and the second packing 13 are placed radially against the inner wall between the shaft-like parts and the first packing seat 10 to provide a stable and reliable sealing effect. Meanwhile, the bottom surface of the third packing 32 is supported by the bottom protruding end of the second packing seat 30, and is pressed axially against the third packing 32 by the pressure ring 40, so that the third packing 32 is compressed axially. At the same time, the third packing 32 is placed radially against the inner wall between the shaft-like parts and the second packing seat 30 to further seal.

[0035] refer to Figure 1In this embodiment, the first packing seat 10 is generally H-shaped, and the cylindrical body 20 is fixedly connected to both ends of the outer periphery of the first packing seat 10 by welding, so as to form a cold water cavity 21 between the outer wall surface of the cylindrical body 20 and the first packing seat 10. Cold water can be introduced and discharged into the cold water cavity 21 accordingly. In actual production, the shaft parts will generate heat through friction with the first packing 12 and the second packing 13 when they move. The cold water in the cold water cavity 21 can dissipate heat from the first packing 12 and the second packing 13, thereby effectively reducing the heat generated by friction, avoiding heat accumulation that accelerates packing wear, and preventing the packing material from softening and aging due to overheating, thus reducing the risk of leakage, providing a stable and reliable sealing effect, and ensuring service life.

[0036] Furthermore, the cold water chamber 21 is connected to an inlet pipe 22 and an outlet pipe 23. Cold water can be introduced into the cold water chamber 21 through the inlet pipe 22, and the water that has undergone heat exchange in the cold water chamber 21 can be drawn out through the outlet pipe 23. This enables the cold water to circulate and dissipate heat within the cold water chamber 21, ensuring the cooling effect on the first packing 12 and the second packing 13.

[0037] In this embodiment, the inlet pipe 22 and the outlet pipe 23 are respectively disposed at the two ends of the top outer periphery of the first packing seat 10. The outlet pipe 23 can be connected into the cold water chamber 21 to ensure smooth water discharge or pumping. It is understood that the arrangement of the inlet pipe 22 and the outlet pipe 23 only needs to meet the functions of water inlet and drainage. The specific setting position and connection method can be adjusted according to actual needs. For example, it can be set in the form of direct connection to the cylinder 20, etc., and no specific limitation is made here.

[0038] Furthermore, in this embodiment, the first packing 12 and the second packing 13 in the first packing seat 10 are arranged sequentially along the extension direction of the first through hole 11 to form a double-layer packing sealing structure, which can synergistically enhance the sealing reliability and ensure the sealing effect; and the third packing 32 in the second packing seat 30 further seals the structure, effectively strengthening the sealing reliability.

[0039] Furthermore, the length of the second packing 13 along the extension direction of the first through hole 11 is four times that of the first packing 12. The double-layer packing seal structure composed of the first packing 12 and the second packing 13 provides sufficient sealing space to ensure the sealing effect.

[0040] Meanwhile, the first packing 12 is corrosion-resistant polytetrafluoroethylene (PTFE) packing, and the second packing 13 is food-grade PTFE packing. (Reference) Figure 1The first packing 12 is correspondingly disposed at the port position of the first packing seat 10. By setting the first packing 12 as a corrosion-resistant polytetrafluoroethylene (PTFE) packing, it can maintain chemical stability in acid and alkali corrosive environments, preventing the sealing material at the port position from being corroded and failing. In addition, the second packing 13 is set as a food-grade PTFE packing, which can meet the hygiene requirements of the food, pharmaceutical and other industries, while also having high temperature resistance and low permeability, effectively preventing media contamination. Furthermore, the length of the second packing 13 is four times that of the first packing 12, which can ensure sealing performance while taking into account corrosion resistance and hygiene and safety requirements. In this embodiment, the first packing 12 and the second packing 13 work together to effectively enhance the sealing reliability, and enable the packing seal structure 100 to be extended to complex working conditions such as high temperature, high pressure, corrosion, and hygiene sensitivity.

[0041] For example, the filler sealing structure 100 in this embodiment can be applied to the rotary structure in the food processing process, which can provide a reliable and stable sealing effect while meeting food hygiene requirements.

[0042] In this embodiment, the length of the third packing 32 along the extension direction of the second through hole 31 is similar to the length of the second packing 13, which can provide a stable and reliable sealing effect. At the same time, the third packing 32 is a food-grade polytetrafluoroethylene packing, which can further improve the sealing reliability and meet hygiene and safety requirements.

[0043] Further, refer to Figure 1 The inner wall surface of the pressure ring 40 is also fitted with a bushing 42.

[0044] Specifically, after the shaft parts are assembled, the bushing 42 can fit against the outer circumferential surface of the shaft parts to avoid direct contact between the shaft parts and the inner wall of the pressure ring 40, prevent frictional wear between the inner wall of the pressure ring 40 and the shaft parts, thereby reducing the problem of increased fit clearance due to wear, thus extending the overall service life of the packing seal structure 100 and ensuring long-term operational stability.

[0045] Furthermore, bushing 42 is a tin bronze alloy bushing. Specifically, tin bronze alloy bushings have the characteristics of high strength, good corrosion resistance, good ductility, and excellent wear resistance, which can significantly reduce the frictional loss between the pressure ring 40 and shaft parts, thereby effectively reducing the maintenance frequency and improving the overall stability and durability of the packing seal structure 100.

[0046] Further, refer to Figure 1The second packing seat 30 is connected to the first packing seat 10 via a first double-ended stud 51 and a first nut 52. The pressure ring 40 is connected to the second packing seat 30 via a second double-ended stud 53 and a second nut 54. Specifically, the engagement of the first double-ended stud 51 and the first nut 52 allows the second packing seat 30 to be quickly and tightly connected to the first packing seat 10. Simultaneously, the first packing 12 and the second packing 13 are axially compressed under the pressure of the second packing seat 30 to ensure a sealing effect. Similarly, the engagement of the second double-ended stud 53 and the second nut 54 allows the pressure ring 40 to be quickly and tightly connected to the second packing seat 30. At the same time, the third packing 32 is axially compressed under the pressure of the pressure ring 40 to ensure a sealing effect.

[0047] Furthermore, the connection between the first double-ended stud 51 and the first nut 52, and the second double-ended stud 53 and the second nut 54, allows for quick assembly while facilitating the disassembly of the first packing seat 10, the second packing seat 30, and the pressure ring 40, thus enabling segmented maintenance in case of malfunction.

[0048] In this embodiment, the first double-ended stud 51 and the first nut 52, as well as the second double-ended stud 53 and the second nut 54, are also fixedly connected on opposite sides to provide a uniform and stable axial clamping force.

[0049] Further, refer to Figure 1 The first packing seat 10 is also provided with a third double-ended stud 55 and a third nut 56, which are used to fix the first packing seat 10 to the external mounting surface. Specifically, the cooperation of the third double-ended stud 55 and the third nut 56 can quickly fix the first packing seat 10 to the corresponding mounting surface in actual production, so as to quickly install and fix the packing sealing structure 100 as a whole.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A packing sealing structure, characterized in that, include: The first packing seat has a first through hole, a first packing and a second packing. The first packing and the second packing are attached to the inner wall surface of the first through hole and are arranged sequentially along the extension direction of the first through hole. A cylindrical body surrounds the outer periphery of the first packing seat and forms a cold water cavity between it and the outer wall surface of the first packing seat; The second packing seat has one end embedded in the first through hole of the first packing seat and pressed against the second packing, and has a second through hole that is connected to the cross-sectional shape of the first through hole. The second packing seat also includes a third packing, which is attached to the inner wall surface of the second through hole. A pressure ring, one end of which is embedded in the second through hole of the second packing seat and pressed against the third packing, has a third through hole that is connected to the cross-sectional shape of the second through hole.

2. The packing seal structure as described in claim 1, characterized in that, The cold water chamber is connected to an inlet pipe and an outlet pipe.

3. The packing seal structure as described in claim 1, characterized in that, The inner wall surface of the pressure ring is also fitted with a bushing.

4. The packing seal structure as described in claim 3, characterized in that, The bushing is a tin bronze alloy bushing.

5. The packing seal structure as described in claim 1, characterized in that, The length of the second packing along the extension direction of the first through hole is four times that of the first packing.

6. The packing seal structure as described in claim 1, characterized in that, The first packing is corrosion-resistant polytetrafluoroethylene packing, the second packing is food-grade polytetrafluoroethylene packing, and the third packing is food-grade polytetrafluoroethylene packing.

7. The packing seal structure as described in claim 1, characterized in that, The second packing seat is connected to the first packing seat by a first double-ended stud and a first nut. The pressure ring is connected to the second packing seat by a second double-ended stud and a second nut.

8. The packing seal structure as described in claim 1, characterized in that, The first packing seat is also provided with a third double-ended stud and a third nut, which are used to fix the first packing seat to the external mounting surface.

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