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CN-224229406-U - Valve packing structure

CN224229406UCN 224229406 UCN224229406 UCN 224229406UCN-224229406-U

Abstract

The utility model relates to a valve packing structure which comprises a valve cover, a valve rod, a sealing packing, a pressing assembly, a heat insulation lining and a packing gland, wherein the valve cover is provided with a cavity for accommodating the valve rod, the valve rod extends into a valve body along the cavity, the sealing packing is arranged in the cavity and surrounds the valve rod, the pressing assembly is sleeved on the valve rod extending out of the valve cover, the pressing assembly is arranged on one side of the valve cover far away from the valve body, the pressing assembly is connected with the valve cover, the heat insulation lining is arranged in the cavity, and the heat insulation lining is sleeved on the valve rod on one side of the sealing packing far away from the packing gland, wherein the pressing assembly is in contact with the sealing packing. According to the utility model, the gap between the sealing valve rod and the cavity is sealed by the heat insulation bushing, so that the contact between a medium in the valve and the sealing filler is effectively reduced, and the direct heat exchange between the medium and the sealing filler is avoided, thereby reducing the influence of the temperature of the medium on the temperature of the sealing filler and effectively reducing the fluctuation of the temperature of the sealing filler.

Inventors

  • QI MAOBO

Assignees

  • 无锡市亚迪流体控制技术有限公司

Dates

Publication Date
20260512
Application Date
20250521

Claims (10)

  1. 1. A valve packing structure, the valve packing structure comprising: The valve cover is provided with a cavity for accommodating a valve rod, and the valve rod extends into the valve main body along the cavity; the sealing filler is arranged in the cavity and surrounds the valve rod; The compression assembly is sleeved on the valve rod extending out of the valve cover and is arranged on one side of the valve cover away from the valve main body; the heat insulation lining is sleeved on the valve rod at one side of the sealing filler, which is far away from the compression assembly; wherein the compression assembly contacts the sealing filler.
  2. 2. The valve packing structure according to claim 1, wherein the valve cover is provided with heat dissipation holes, at least two heat dissipation holes are arranged on the valve cover around the axis of the valve rod, and at least two heat dissipation holes are arranged on the valve cover along the axis of the valve rod.
  3. 3. The valve packing structure of claim 2, wherein said heat dissipating holes in said valve stem are offset along the axis of said valve stem.
  4. 4. The valve packing structure of claim 2, wherein the closer to one side of the seal packing, the smaller the spacing between adjacent ones of the louvers.
  5. 5. The valve packing structure of claim 1, wherein the packing assembly comprises a packing gland and a packing sleeve sleeved on the valve rod, the packing gland is connected with the valve cover, the packing sleeve is arranged between the packing gland and the valve cover, and the packing sleeve extends into the cavity.
  6. 6. A valve packing structure according to claim 5, wherein a first inclined surface is arranged on one side, close to the packing sleeve, of the packing gland, a second inclined surface is arranged on the packing sleeve and is in contact with the first inclined surface, the first inclined surface is parallel to the second inclined surface, and one side, far away from the valve rod, of the first inclined surface is close to the valve cover.
  7. 7. The valve packing structure of claim 5, wherein the packing press sleeve is coaxially provided with a first hole and a second hole, the valve rod passes through the packing press sleeve along the first hole and the second hole, the aperture of the second hole is larger than the diameter of the first hole, and the second hole is arranged on one side of the first hole close to the packing press cover.
  8. 8. A valve packing structure according to claim 5 wherein said packing sleeve is provided with an extension extending radially adjacent the end of said packing gland.
  9. 9. The valve packing structure of claim 1, wherein the cavity further comprises an expanded section with an expanded inner diameter, a step is formed between the expanded section and the cavity without the expanded inner diameter, and an end of the insulating bushing, which is far away from the sealing packing, contacts the step.
  10. 10. The valve packing structure of claim 1, wherein the compression assembly is provided with a first threaded hole, the valve cover is provided with a second threaded hole, and the threaded connection piece is in threaded connection with the compression assembly and the valve cover through the first threaded hole and the second threaded hole.

Description

Valve packing structure Technical Field The utility model relates to the technical field of valve equipment, in particular to a valve packing structure. Background The sealing filler is a core component for dynamic sealing between the valve cover and the valve rod, and fills a tiny gap between the valve rod and the stuffing box through elastic deformation, so that medium leakage is avoided. Wherein, temperature is an important parameter affecting the performance of the sealing filler, and the temperature of the medium easily affects the temperature of the sealing filler. Too high a temperature may reduce the elastic modulus of the sealing filler, resulting in the sealing filler losing its ability to gap deformation. The high temperature also damages the surface structure of some of the packing, such as the graphite packing, in the high temperature oxidation environment, which damages the surface lubrication layer, exacerbating the wear of the packing and the valve stem. At the same time, the thermal expansion coefficients of the valve rod and the sealing filler are different, and the gap between the sealing filler and the valve rod is increased due to temperature change. And the packing is frozen at low temperature, so that the valve is blocked, the sealing is leaked and the like. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art. Disclosure of utility model In view of the above-mentioned drawbacks of the prior art, it is an object of the present utility model to provide a valve packing structure to reduce variations in the temperature of the sealing packing. The technical scheme of the utility model is as follows: The valve packing structure comprises: The valve cover is provided with a cavity for accommodating a valve rod, and the valve rod extends into the valve main body along the cavity; the sealing filler is arranged in the cavity and surrounds the valve rod; The compression assembly is sleeved on the valve rod extending out of the valve cover and is arranged on one side of the valve cover away from the valve main body; the heat insulation lining is sleeved on the valve rod at one side of the sealing filler, which is far away from the compression assembly; wherein the compression assembly contacts the sealing filler. The valve cover is further provided with a heat dissipation hole, at least two heat dissipation holes are formed in the valve cover around the axis of the valve rod, and at least two heat dissipation holes are formed in the valve cover along the axis of the valve rod. The further technical scheme is that the heat dissipation holes on the valve rod are arranged in a staggered mode along the axis of the valve rod. The further technical proposal is that the closer to one side of the sealing filler, the smaller the distance between the adjacent heat dissipation holes. The packing assembly comprises a packing gland and a packing sleeve which are sleeved on the valve rod, wherein the packing gland is connected with the valve cover, the packing sleeve is arranged between the packing gland and the valve cover, and the packing sleeve extends into the cavity. The packing gland is characterized in that a first inclined plane is arranged on one side, close to the packing gland, of the packing gland, a second inclined plane is arranged on the packing gland and is in contact with the first inclined plane, the first inclined plane is parallel to the second inclined plane, and one side, far away from the valve rod, of the first inclined plane is close to the valve cover. The packing gland is characterized in that a first hole and a second hole are coaxially formed in the packing gland, the valve rod penetrates through the packing gland along the first hole and the second hole, the diameter of the second hole is larger than that of the first hole, and the second hole is arranged on one side, close to the packing gland, of the first hole. The further technical scheme is that the packing sleeve is close to the tail end of the packing gland and is provided with an extension part in a radial extending mode. The heat insulation lining is characterized in that the cavity is internally provided with an expansion section with an enlarged inner diameter, a step is formed between the expansion section and the cavity with a non-enlarged inner diameter, and one end of the heat insulation lining, which is far away from the sealing filler, is contacted with the step. The pressing assembly is further characterized in that a first threaded hole is formed in the pressing assembly, a second threaded hole is formed in the valve cover, and a threaded connecting piece is in threaded connection with the pressing assembly and the valve cover through the first threaded hole and the second threaded hole. The b