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CN-224228839-U - Floating type ultrahigh pressure sealing device suitable for ultrahigh pressure plunger pump

CN224228839UCN 224228839 UCN224228839 UCN 224228839UCN-224228839-U

Abstract

The utility model discloses a floating type ultrahigh pressure sealing device suitable for an ultrahigh pressure plunger pump, which relates to the technical field of ultrahigh pressure plunger pump sealing, and aims to solve the problems that in the aspect of the existing dynamic sealing performance, the sealing ring is irreversibly worn due to friction between a high pressure reciprocating motion center shaft and the sealing, the sealing fails after the reciprocating motion reaches a certain number of times, and the geometric design of a sealing lip is not optimized. The combined sealing structure is adopted to fully seal the whole body, and the friction loss can be automatically compensated, so that the whole body is ensured to have a durable and good sealing effect in a high-pressure state.

Inventors

  • ZHANG GAOFEI
  • ZHANG HONGYI
  • LI LEI

Assignees

  • 上海迈克孚生物科技有限公司

Dates

Publication Date
20260512
Application Date
20250627

Claims (5)

  1. 1. The utility model provides a floating superhigh pressure sealing device suitable for superhigh pressure plunger pump, includes plunger pump body (1) and is used for moving movable cylinder (2) in plunger pump body (1) inside, is provided with between movable cylinder (2) and plunger pump body (1) and is used for increasing sealing mechanism (3) of superhigh pressure sealed effect, wherein sealing mechanism (3) inside including installing sealing plug body (4) in movable cylinder (2) bottom, be close to one end fixedly connected with erection column (5) of movable cylinder (2), erection hole (6) that supply erection column (5) assembly are offered to movable cylinder (2) inside, sealing plug body (4) presss from both sides with movable cylinder (2) and is equipped with first sealing washer (7), sealing plug body (4) reserve with movable cylinder (2) have first seal groove (8) that are used for installing first sealing washer (7), one side fixedly connected with sealing ring (9) that movable cylinder (2) were kept away from to first sealing washer (7).
  2. 2. The floating ultrahigh pressure sealing device suitable for the ultrahigh pressure plunger pump, as set forth in claim 1, is characterized in that the sealing ring (9) is located at the outer side of the sealing plug body (4), a pressing base (10) is fixedly connected to one surface, far away from the movable column body (2), of the sealing plug body (4), a second support (11) is clamped between the pressing base (10) and the sealing ring (9), and a second support groove (12) for installing the second support (11) is reserved between the pressing base (10) and the sealing ring (9).
  3. 3. The floating ultrahigh pressure sealing device suitable for the ultrahigh pressure plunger pump, as claimed in claim 1, is characterized in that a positioning clamping button (13) is movably connected inside the mounting column (5), a limiting clamping hole (14) communicated with the inside of the mounting hole (6) is formed inside the movable column (2), and the limiting clamping hole (14) is matched with the positioning clamping button (13) in shape and size.
  4. 4. The floating ultrahigh pressure sealing device suitable for the ultrahigh pressure plunger pump according to claim 3, wherein a movable groove (15) for a positioning clamp button (13) to move is formed in the mounting column (5), a mounting spring (16) is fixedly connected in the movable groove (15), one surface, far away from the movable groove (15), of the mounting spring (16) is fixedly connected with the positioning clamp button (13), the positioning clamp button (13) is movably connected with the movable groove (15) through the mounting spring (16), and the positioning clamp button (13) is of a truncated cone-shaped structure with a smooth outer surface.
  5. 5. The floating ultrahigh pressure sealing device suitable for the ultrahigh pressure plunger pump, which is disclosed in claim 1, is characterized in that the sealing rings (9) are distributed between the first sealing ring (7) and the second support (11) at equal intervals, and the inside of the sealing rings (9) is fixedly connected with the outer side of the sealing plug body (4).

Description

Floating type ultrahigh pressure sealing device suitable for ultrahigh pressure plunger pump Technical Field The utility model relates to the technical field of ultra-high pressure plunger pump sealing, in particular to a floating ultra-high pressure sealing device suitable for an ultra-high pressure plunger pump. Background The ultra-high pressure plunger seal ring (especially the general plug seal ring) still faces significant technical bottlenecks under extreme working conditions, and the core defects of the ultra-high pressure plunger seal ring can be attributed to the insufficient cooperation of material performance, structural design, manufacturing process and verification system. Firstly, in terms of materials, a general plug sealing ring main body material such as filled Polytetrafluoroethylene (PTFE) or ultra-high molecular polyethylene (UPE) is easy to generate plastic deformation under ultra-high pressure (> 100 MPa) due to creep property, brittle fracture is caused by toughness reduction in a low-temperature environment (such as-196 ℃), and secondly, a spring energy storage structure has failure risk, a stainless steel spring is easy to fatigue fracture under high pressure, and a corrosive medium weakens the elastic compensation capability of the stainless steel spring, so that the existing design does not fully consider the adaptation of nonlinear load distribution and extreme chemical environment; In the manufacturing process, the uniformity of filling UPE and the assembly precision of springs are difficult to ensure in the turning forming process, micro gaps or stripping are caused by local stress concentration and interface thermal expansion coefficient difference (such as a metal spring and a non-metal sealing shell), in addition, a finite element model is mostly based on static assumption, the nonlinear constitutive relation of materials under ultrahigh pressure and the multi-physical field coupling effect are not accurately simulated, long-term service data lack also enables life prediction to depend on experience, in terms of cost, high-performance materials (such as UPE) and customized springs push up the manufacturing cost, and excessive maintenance or unexpected shutdown are caused by lack of standardized indexes in maintenance. The prior art scheme has the defects that in the aspect of dynamic sealing performance, lubricant is easy to extrude in high-pressure reciprocating motion, dry friction is increased, irreversible abrasion is generated on a sealing lip, abnormal abrasion is further increased due to the fact that the geometric design of the sealing lip is not optimized (such as mismatching of chamfer radius and pressure gradient), and meanwhile, the dynamic response lag of a spring is difficult to adapt to pressure abrupt change working conditions, so that instant leakage is caused. Disclosure of utility model The utility model aims to provide a floating type ultrahigh pressure sealing device which breaks through the structural limitation that a traditional universal plug sealing ring depends on spring energy storage and is suitable for an ultrahigh pressure plunger pump. In order to achieve the above purpose, the present utility model provides the following technical solutions: The utility model provides a floating superhigh pressure sealing device suitable for superhigh pressure plunger pump, includes the plunger pump body and is used for the movable cylinder at the inside removal of plunger pump body, is provided with the sealing mechanism who is used for increasing the superhigh pressure sealed effect between movable cylinder and the plunger pump body, the inside sealed cock body of installing in movable cylinder bottom that is including being close to of sealing mechanism, the one end fixedly connected with erection column that is close to the movable cylinder, the erection hole that supplies the erection column to assemble has been seted up to the inside of movable cylinder, sealed cock body presss from both sides with the movable cylinder and is equipped with first sealing washer, sealed cock body and movable cylinder are reserved and are used for installing first sealing washer's first seal groove, one side fixedly connected with sealing washer that the movable cylinder was kept away from to first sealing washer. Through adopting above-mentioned technical scheme, first sealing washer, sealing ring and second support make up into the core subassembly of solid gradient compound sealing pad, realize the dynamic matching of sealing force and system pressure through nonlinear elasticity modulus distribution design, promptly under the too big circumstances of whole pressure, seal structure realizes that the multiport extrusion realizes holistic adherence is sealed to even being worn and torn under the effect of pressure, also can the automatic compensation by the part that is worn and torn. Further, the sealing ring is located the sealing plug body outside, one side fixedly co