Valve sealing packing device

Abstract

The utility model discloses a valve sealing packing device, relates to the technical field of valves, and solves the problems that a gland is time-consuming to operate, and leakage is caused by non-uniform pressing force of the gland. Comprising a gland, a stuffing box and a stuffing bin formed in a valve body, the gland is in a hollow cylinder shape, a shaft hole is formed in the center of the gland, the gland is sleeved outside a valve rod through the shaft hole, external threads are arranged on the periphery of the gland, and internal threads are arranged on the upper portion of the stuffing bin. The external threads are matched with the internal threads, and the gland is screwed in a threaded connection mode so that the stuffing box can be tightly pressed in the stuffing cavity. The gland is in threaded connection with the filler bin, so that the mounting and dismounting processes of the filler device are simplified; meanwhile, the threaded connection mode can ensure that uniform and stable pressing force is applied to the stuffing box in the screwing process of the gland, so that the stuffing in the stuffing box is tightly attached to the stuffing cavity of the valve body, the sealing failure caused by uneven pressing force is avoided, the stable sealing performance of the stuffing device is improved, and the fluid leakage risk is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of valve, especially a valve sealing packing device. BACKGROUND

[0002] In many fields of industrial production, as a key component for controlling fluid delivery, valve plays a vital role. The sealing performance of valve is directly related to the safety, stability and operating efficiency of the entire fluid delivery system. The gland of the traditional valve sealing packing device usually adopts a relatively simple fixing method, such as bolt connection. This connection method has many inconveniences in actual operation. On the one hand, due to the large number of bolts, a lot of time is needed for installation and disassembly, especially on some production lines with extremely high requirements for equipment maintenance timeliness, which undoubtedly increases the downtime of the equipment and reduces the production efficiency. On the other hand, the bolts are prone to looseness during long-term use, resulting in uneven compression force of the gland on the packing box, and thus the packing cannot tightly fit the packing cavity of the valve body, causing sealing failure and fluid leakage, which not only wastes resources but also may cause damage to the surrounding environment and equipment. In addition, the traditional gland lacks a design for convenient operation, and workers often have difficulty in applying uniform force when tightening or loosening the gland, further affecting the sealing effect. SUMMARY

[0003] The utility model discloses a valve sealing packing device to overcome the defects of the prior art and solve the problems of time-consuming operation of the gland, uneven compression force of the gland and leakage.

[0004] The technical scheme of the utility model discloses a valve including a valve body and a valve stem, a sealing packing device including a gland, a packing box and a packing chamber formed in the valve body, the valve stem penetrating through the packing chamber, and the packing box being installed in the packing chamber; the gland is in the shape of a hollow cylinder, an axial hole is formed in the center of the gland, the gland is sleeved on the valve stem through the axial hole, an outer thread is arranged on the outer periphery of the gland, an inner thread is formed in the upper part of the packing chamber, the outer thread is matched with the inner thread and the gland is tightened on the packing chamber through the threaded connection to compress the packing box in the packing chamber.

[0005] The above technical scheme replaces the traditional bolt connection method, uses threaded connection between the gland and the packing chamber, simplifies the installation and disassembly process of the packing device; at the same time, the threaded connection can ensure that the gland applies uniform and stable compression force to the packing box during tightening, so that the packing in the packing box tightly fits the packing chamber of the valve body, avoiding sealing failure caused by uneven compression force, thereby providing stable sealing performance of the packing device and reducing the risk of fluid leakage.

[0006] The further setting of the utility model discloses: the top surface of the gland is provided with the notch groove of radial arrangement, is used for adapting special tool sleeve valve rod and inserts the notch groove, to drive the gland to be screwed or loosened.

[0007] With the further setting, the operator uses the adapted special tool, passes through the sleeve valve rod and inserts the notch groove, can easily force to the gland, and the radial notch groove provides the convenient force point for the screwing or loosening operation of the gland, makes the rotation of the gland more stable, further guarantees the uniformity of the compression force of the gland to the packing box, and improves the sealing effect.

[0008] The further further setting of the utility model discloses: the number of notch grooves is at least two, and is evenly distributed along the circumferential direction of the top surface of the gland.

[0009] With the further further setting, in some space limited installation environment, the operator can select the appropriate angle notch groove and inserts the tool to operate, on the other hand, the even distribution ensures that the gland is stressed evenly when using special tools, avoids the deformation or damage of the gland due to the excessive force of single point, prolongs the service life of the gland, also guarantees the uniform consistency of the compression force of the packing box, maintains the sealing performance of the stable valve.

[0010] The further further setting of the utility model discloses: the limit ring table of protruding the inner wall of the shaft hole is formed on the inner wall of the shaft hole of the gland, the top of the valve rod is provided with the step groove extending from top to bottom, and the limit ring table and the step groove are formed limit.

[0011] With the further further setting, the close abutment of the limit ring table and the step groove locks the position of the valve rod through the gland, prevents the valve rod from blowing out, effectively prevents the displacement of the valve rod along the axial direction, maintains the stable position of the valve rod, and guarantees the reliability of the operation of the valve rod. ACCURACY

[0012] Fig. 1 It is the structure schematic diagram of the utility model half section;

[0013] Fig. 2 It is the section schematic diagram of the utility model;

[0014] Fig. 3 It is the explosion schematic diagram of the utility model;

[0015] Among them, 1, valve body;11, packing box;12, internal thread;2, valve rod;21, step groove;3, gland;31, shaft hole;32, external thread;33, notch groove;34, limit ring table;4, packing box. Specific implementation

[0016] As Figs. 1-3As shown, the valve of the utility model mainly consists of valve body 1 and valve stem 2, sealing packing device includes gland 3, packing box 4 and the packing bin 11 formed in valve body 1. Valve stem 2 vertically penetrates packing bin 11, provides support and conduction for fluid control action, and packing box 4 is filled and installed in packing bin 11, bears the basic function of filling and sealing. Gland 3 is hollow cylindrical, and axial shaft hole 31 is formed in the center, and the size is matched with the outer diameter of valve stem 2, so that gland 3 can be sleeved on the outer side of valve stem 2 through shaft hole 31, and tight and flexible cooperation is realized. At the same time, the outer thread 32 processed on the outer periphery of gland 3 is matched with the inner thread 12 also formed on the upper part of packing bin 11, and the two form a threaded connection mode, which is the core structure of the whole device to simplify the installation and disassembly process and ensure the sealing performance. The outer thread 32 of gland 3 is replaced by the inner thread 12 of packing bin 11, which simplifies the installation and disassembly of the packing device. During installation, first, packing box 4 is installed in packing bin 11, then the bottom end of gland 3 is connected with the inner thread 12 on the upper part of packing bin 11, and finally, gland 3 is screwed. The threaded connection can keep the axial nature of gland 3 during the process, so that the bottom surface of gland 3 is uniformly pressed on the top surface of packing box 4. With the tightening of gland 3, uniform and stable pressing force is applied to packing box 4, so that the packing of packing box 4 tightly fits the packing cavity of valve body 1 and the outer peripheral surface of valve stem 2, thereby providing stable sealing performance.

[0017] In order to solve the problem of inconvenient operation of the gland 3 of the traditional valve sealing packing device, the utility model discloses that the top surface of the gland 3 is provided with a radial notch groove 33. In the actual operation scene, the operator holds the matched special tool, sleeves the tool on the valve stem 2, and then accurately inserts it into the notch groove 33. Due to the radial arrangement of the notch groove 33, a stable and reasonable force arm structure is formed between the tool and the gland 3, and the operator only needs to rotate with light force, so that the gland 3 can be easily tightened or loosened. This way provides a very convenient operation process, so that the rotation of the gland 3 is more stable and smooth, and the uniformity of the pressing force of the gland 3 on the packing box 4 is ensured from the operation level, thereby effectively improving the sealing effect.

[0018] The number of notch grooves 33 is at least two, and they are uniformly distributed along the circumferential direction of the top surface of the gland 3. The uniformly distributed notch grooves 33 ensure that the gland 3 can be uniformly stressed in all directions when the special tool is stressed, effectively avoiding the risk of packing deformation or damage caused by excessive stress at a single point, ensuring the uniformity of the pressing force on the packing box 4, and making the valve maintain a sustained and stable sealing effect during long-term operation.

[0019] Considering the stability of the valve rod 2 during operation of the valve is crucial, the utility model discloses the limit ring table 34 of protruding axle hole 31 inner wall on the inner wall of axle hole 31 of gland 3, correspondingly, the top of valve rod 2 is provided with the step groove 21 extending from top to bottom, and the limit ring table 34 is limited with step groove 21. The inner diameter of limit ring table 34 is slightly smaller than the inner diameter of axle hole 31, and the outer diameter of step groove 21 is slightly smaller than the outer diameter of valve rod 2, and the inner diameter of limit ring table 34 and the outer diameter of step groove 21 are gap matched, so that the bottom surface of limit ring table 34 is in contact with the radial groove wall of step groove 21 and abuts. When the gland 3 is installed in place, the limit ring table 34 is closely abutted with the step groove 21, forming a stable and reliable limiting structure. During the operation of the valve rod 2, especially when subjected to fluid pressure impact or other external force interference, axial displacement occurs, so that, by the limitation of the gland 3, the valve rod 2 can be prevented from moving outward, and the reliability of the operation of the valve rod 2 is improved.

Claims

1. A valve sealing packing device, wherein the valve includes a valve body and a valve stem, characterized in that: The sealing packing device comprises a gland, a packing box and a packing chamber formed in a valve body, the valve rod penetrates through the packing chamber, and the packing box is installed in the packing chamber; the gland is in a hollow cylindrical shape, an axial hole is formed in the center of the gland, the gland is sleeved on the valve rod through the axial hole, an outer thread is arranged on the outer periphery of the gland, an inner thread is formed in the upper part of the packing chamber, the outer thread is matched with the inner thread and the gland is screwed to tightly press the packing box in the packing chamber through the threaded connection.

2. The valve packing device of claim 1, wherein: A radial notch groove is formed in the top surface of the gland, a special tool is sleeved on the valve rod and inserted into the notch groove to drive the screwing or unscrewing of the gland.

3. The valve packing gland apparatus of claim 2, wherein: The number of the notch grooves is at least two, and the notch grooves are uniformly distributed along the circumferential direction of the top surface of the gland.

4. A valve packing gland as claimed in claim 1 or 2, characterised in that: A limiting ring table protruding from the inner wall of the axial hole of the gland is arranged on the inner wall of the axial hole, a step groove extending from top to bottom is formed in the top part of the valve rod, and the limiting ring table and the step groove are abutted to form a limiting.

Images