Low-dissipation filler structure

Abstract

The utility model provides a low-dissipation packing structure. The low-dissipation packing structure comprises an upper cover, a packing pad, a packing group, a packing gland, a packing pressing plate and a valve rod, a valve rod is arranged in the upper cover, the two ends of the valve rod extend out of the upper cover, stuffing box grooves are formed in the upper cover on the periphery of the valve rod, a stuffing set is arranged in the stuffing box grooves, stuffing pads and shaft sleeve assemblies are sequentially arranged in the stuffing box grooves on the two sides of the stuffing set from bottom to top, and a stuffing gland is arranged at the end of the shaft sleeve assembly on the upper side of the stuffing set. Guide assemblies are symmetrically arranged on the two sides of the valve rod at the upper end of the filler pressing plate, and the filler pressing plate and the guide assemblies are fixed to the upper cover through fasteners. The shaft sleeve assemblies are arranged on the upper side and the lower side of the packing set, the valve rod can be stabilized, and packing leakage caused by deflection of the valve rod is avoided; the U-shaped sealing ring at the lower end of the packing set can prevent particle media from entering the packing set to damage the valve rod, meanwhile, the valve rod can be scraped, scale deposition on the surface of the valve rod is avoided, and the U-shaped sealing ring at the upper end of the packing set plays a role in low dissipation.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a low-escape packing structure. Background Art

[0002] In recent years, with the upgrading of industrial control technology, the application fields of control valves have become more and more extensive, and the working conditions they need to cope with have become more and more complex. In the chemical, petroleum, metallurgical, electric power and other industries, the valve stem deflects seriously under some working conditions during the production process, resulting in leakage of packing, and often involving flammable, explosive, toxic and harmful media; at the same time, the environment in which some control valves are located is also relatively harsh, accompanied by sand, dust and other particles, which can easily allow external environmental debris to enter the valve packing area, causing damage to the packing. Based on these harsh working conditions involved above, a low-emission packing structure is required to ensure the reliability and safety of the valve during use. Summary of the invention

[0003] In view of the deficiencies in the prior art, the utility model provides a low-emission packing structure, which can avoid valve stem deflection; can prevent granular media from damaging the packing, thereby improving the reliability and safety of the valve during use; a multi-disc spring structure that can adjust the number of disc springs according to the load can compensate for insufficient packing sealing pressure ratio caused by pressure and temperature changes; a guide sleeve structure is provided on the multi-disc spring structure, which can guide and mechanically limit the disc springs, thereby avoiding disc spring misalignment failure and long-term overload performance failure.

[0004] The technical solution adopted by the utility model is:

[0005] A low-emission packing structure, which includes: an upper cover, a packing pad, a packing group, a packing gland, a packing pressure plate, and a valve stem; a valve stem is arranged in the upper cover, and both ends of the valve stem extend to the outside of the upper cover; a packing box groove is arranged in the upper cover at the outer periphery of the valve stem, a packing group is arranged in the packing box groove, packing pads and shaft sleeve assemblies are arranged in the packing box grooves on both sides of the packing group from bottom to top in sequence, a packing gland is arranged at the end of the shaft sleeve assembly on the upper side of the packing group, a packing pressure plate is arranged on the upper end of the packing gland, guide assemblies are symmetrically arranged on both sides of the valve stem on the upper end of the packing pressure plate, and the packing pressure plate and guide assemblies are fixed to the upper cover by fasteners.

[0006] Preferably, in the low-emission packing structure, the shaft sleeve assembly comprises a sealing ring, a bushing and a shaft sleeve, the bushing is arranged inside the shaft sleeve, and sealing rings are arranged on both upper and lower sides of the shaft sleeve.

[0007] Preferably, in the low-emission packing structure, the guide assembly comprises a guide sleeve and a disc spring disposed in the guide sleeve.

[0008] Preferably, in the low-emission packing structure, grooves are symmetrically arranged on the inner wall of the upper side of the packing pressure plate close to the outer periphery of the valve stem, and dust rings are arranged in the grooves.

[0009] Preferably, in the low-emission packing structure, the sealing ring is a U-shaped sealing ring.

[0010] Preferably, in the low-emission packing structure, one end of the valve stem extends to the outside of one end surface of the upper cover, and the other end passes through the other end surface of the upper cover, the packing gland, the packing pressure plate in sequence and extends to the outside of the packing pressure plate.

[0011] Advantages of the utility model:

[0012] (1) In the low-emission packing structure of the utility model, shaft sleeve assemblies are arranged on the upper and lower sides of the packing group, which can stabilize the valve stem and avoid leakage of the packing due to the deflection of the valve stem; a U-shaped sealing ring is used for auxiliary sealing. The U-shaped sealing ring at the lower end of the packing group can prevent granular media from entering the packing group and damaging the valve stem, and can also scratch the valve stem to avoid scale accumulation on the surface of the valve stem. The U-shaped sealing ring at the upper end of the packing group can play a role in low emission.

[0013] (2) The low-emission packing structure of the utility model is provided with disc springs, which can cope with the changes in packing sealing pressure ratio caused by pressure changes and temperature changes, avoid leakage caused by insufficient packing pressure ratio, and can also adjust the number of disc springs according to working conditions.

[0014] (3) The low-emission packing structure of the utility model adopts a guide sleeve to guide the disc spring, which can not only avoid the disc spring from failing due to misalignment, but also set a mechanical limit to avoid the disc spring from failing due to long-term overload.

[0015] (4) The low-emission packing structure of the utility model adopts a dust-proof structure design. A dust-proof ring is provided at the packing pressure plate to prevent external dust and prevent environmental debris from entering the packing area and damaging the packing group or the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the structure of the utility model.

[0017] Figure 2 yes Figure 1 A partial enlarged view of Figure I.

[0018] Figure 3 The utility model is a schematic diagram of the combined structure of a multi-disc disc spring and a guide sleeve.

[0019] Figure 4 yes Figure 1 A partial enlarged view of middle II.

[0020] Explanation of the reference numerals: 1-upper cover, 2-packing pad, 3-U-shaped sealing ring, 4-bushing, 5-shaft sleeve, 6-packing group, 7-packing gland, 8-packing pressure plate, 9-disc spring, 10-dust ring, 11-guide sleeve, 12-valve stem, 13-groove. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with specific drawings and embodiments.

[0022] like Figure 1-4 As shown: This embodiment provides a low-emission packing structure, which includes: an upper cover 1, a packing pad 2, a packing group 6 and a packing gland 7, a packing pressure plate 8, and a valve stem 12; the valve stem 12 is arranged in the upper cover 1, and both ends of the valve stem 12 extend to the outside of the upper cover 1, a packing box groove is arranged in the upper cover 1 at the outer periphery of the valve stem 12, a packing group 6 is arranged in the packing box groove, and packing pads 2 and shaft sleeve assemblies are arranged in the packing box grooves on both sides of the packing group 6 from bottom to top, a packing gland 7 is arranged at the end of the shaft sleeve assembly on the upper side of the packing group 6, a packing pressure plate 8 is arranged on the upper end of the packing pressure plate 7, and guide assemblies are symmetrically arranged on both sides of the valve stem 12 at the upper end of the packing pressure plate 8, and the packing pressure plate 8 and the guide assembly are fixed to the upper cover 1 by fasteners.

[0023] The shaft sleeve assembly includes a sealing ring 3, a bushing 4, and a shaft sleeve 5, wherein the bushing 4 is arranged inside the shaft sleeve 5, and sealing rings 3 are arranged on both the upper and lower sides of the shaft sleeve 5; the guide assembly includes a guide sleeve 11 and a disc spring 9 arranged inside the guide sleeve 11; grooves 13 are symmetrically arranged on the inner wall of the upper side of the packing pressure plate 8 close to the outer periphery of the valve stem 12, and a dust ring 10 is arranged in the groove 13; the sealing ring 3 is a U-shaped sealing ring 3; one end of the valve stem 12 extends to the outside of one end surface of the upper cover 1, and the other end passes through the other end surface of the upper cover 1, the packing pressure cover 7, the packing pressure plate 8 in sequence and extends to the outside of the packing pressure plate 8.

[0024] The bushing 4 guides and can effectively prevent the packing from leaking out due to the deflection of the valve stem 12; the U-shaped sealing ring 3 of the shaft sleeve 5 at the lower end of the packing group 6 can prevent the internal granular medium from entering the packing area, avoiding damage to the packing group 6, and at the same time scraping the valve stem 12 to avoid fouling on the surface of the valve stem 12; the U-shaped sealing ring 3 of the shaft sleeve 5 at the upper end of the packing group 6 can be used as an auxiliary seal to play a role in low dissipation; the packing pressure plate 8 is provided with a multi-disc spring structure 9, and this elastic load can cope with the changes in the packing seal specific pressure caused by pressure alternation and temperature alternation, prevent leakage caused by insufficient packing specific pressure, and can also adjust the number of disc springs 9 according to working conditions; the disc spring 9 is provided with a guide sleeve 11 for guiding, which can not only avoid the failure of the disc spring 9 due to misalignment, but also set a mechanical limit to avoid the performance failure of the disc spring 9 due to long-term overload; the packing pressure plate 8 is provided with a dust ring 10 for external dust prevention to prevent environmental debris from entering the packing area and damaging the packing group 6 or the valve stem 12.

[0025] The low-emission packing structure of the utility model adopts shaft sleeve assemblies at the upper and lower ends of the packing group, which can stabilize the valve stem and avoid the valve stem from swinging and causing the packing to leak out; secondly, the structural design of the U-shaped sealing ring auxiliary seal is adopted to prevent the granular medium from entering the packing group, causing damage to the valve stem packing, and at the same time scratching the valve stem to avoid scaling on the valve stem surface; the U-shaped sealing ring at the upper end of the packing group can play a role in low emission; thirdly, the multi-disc spring structure is adopted to cope with the changes in the packing seal pressure ratio caused by pressure alternation and temperature alternation, avoid leakage caused by insufficient packing pressure ratio, and also The number of disc springs is adjusted according to the working conditions; at the same time, a guide sleeve is used to guide the disc spring, which can not only avoid the disc spring from failing due to misalignment, but also set a mechanical limit to avoid the disc spring from failing due to long-term overload; finally, a dustproof structure design is adopted, and a dustproof ring is provided at the packing pressure plate to prevent external dust and prevent environmental debris from entering the packing area and damaging the packing group or the valve stem; based on the above structure, the utility model has a low-emission packing structure that can fully meet the working conditions of multiple industries, such as toxic and harmful, easy to leak, easy to deflect the valve stem, and easy to damage the packing. Special valves.

[0026] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A low fugitive packing structure, characterized in that: The invention comprises an upper cover (1), a packing pad (2), a packing group (6), a packing gland (7), a packing pressure plate (8), and a valve stem (12); the valve stem (12) is arranged in the upper cover (1), and both ends of the valve stem (12) extend outside the upper cover (1); a packing box groove is arranged in the upper cover (1) at the outer periphery of the valve stem (12); a packing group (6) is arranged in the packing box groove; packing pads (2) and shaft sleeve assemblies are arranged in the packing box grooves on both sides of the packing group (6) in sequence from bottom to top; a packing gland (7) is arranged at the end of the shaft sleeve assembly on the upper side of the packing group (6); a packing pressure plate (8) is arranged at the upper end of the packing gland (7); guide assemblies are symmetrically arranged on both sides of the valve stem (12) at the upper end of the packing pressure plate (8); the packing pressure plate (8) and the guide assembly are fixed to the upper cover (1) by fasteners.

2. The low-emission packing structure according to claim 1, characterized in that: The shaft sleeve assembly comprises a sealing ring (3), a bushing (4), and a shaft sleeve (5); the bushing (4) is arranged inside the shaft sleeve (5), and sealing rings (3) are arranged on both upper and lower sides of the shaft sleeve (5).

3. The low-emission packing structure according to claim 1, characterized in that: The guide assembly comprises a guide sleeve (11) and a disc spring (9) arranged in the guide sleeve (11).

4. The low-emission packing structure according to claim 1, characterized in that: A groove (13) is symmetrically arranged on the inner wall of the upper side of the packing pressure plate (8) close to the outer periphery of the valve stem (12), and a dust ring (10) is arranged in the groove (13).

5. The low-emission packing structure according to claim 2, characterized in that: The sealing ring (3) is a U-shaped sealing ring (3).

6. The low-emission packing structure according to claim 1, characterized in that: One end of the valve stem (12) extends to the outside of one end surface of the upper cover (1), and the other end passes through the other end surface of the upper cover (1), the packing gland (7), and the packing pressure plate (8) in sequence and extends to the outside of the packing pressure plate (8).

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