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CN-224214350-U - Valve component and hydraulic end of plunger pump

CN224214350UCN 224214350 UCN224214350 UCN 224214350UCN-224214350-U

Abstract

The application discloses a valve component and a hydraulic end of a plunger pump, and relates to the field of oil and gas equipment. A valve assembly comprises a valve seat, a valve body, a first lining and a second lining, wherein the valve seat is provided with a through cavity which is axially arranged along the valve seat, the first lining is annularly arranged at a port of one end of the through cavity, the second lining is annularly arranged in the through cavity and is in butt joint with the first lining, the valve body is movably arranged in the first lining and the second lining along the axial direction, and the valve body is in contact with or separated from at least part of the inner surface of the first lining. The application can solve the problem of failure of the valve seat caused by damage of the interior and the port of the valve seat.

Inventors

  • LI XIAOBIN
  • TIAN ZHIFEI
  • QU YU

Assignees

  • 烟台杰瑞石油装备技术有限公司

Dates

Publication Date
20260508
Application Date
20250606

Claims (10)

  1. 1. The valve assembly is characterized by comprising a valve seat (10), a valve body (20), a first bushing (30) and a second bushing (40); the valve seat (10) is provided with a through cavity (11) axially arranged along the valve seat, the first bushing (30) is annularly arranged at a port (113) at one end of the through cavity (11), and the second bushing (40) is annularly arranged in the through cavity (11) and is in butt joint with the first bushing (30); The valve body (20) is movably arranged in the first lining (30) and the second lining (40) along the axial direction, and the valve body (20) is contacted with or separated from at least part of the inner surface of the first lining (30).
  2. 2. Valve assembly according to claim 1, characterized in that the inner wall of the through cavity (11) is provided with a first ring groove (111) and a second ring groove (112), the first ring groove (111) is located at the port (113), the second ring groove (112) is located at one side of the first ring groove (111) facing away from the port (113), and the depth of the first ring groove (111) is greater than the depth of the second ring groove (112) along the radial direction of the valve seat (10); The first bushing (30) is arranged in the first annular groove (111), and the second bushing (40) is arranged in the second annular groove (112).
  3. 3. Valve assembly according to claim 2, characterized in that the outer wall of the first bushing (30) is in interference fit with the inner wall of the first annular groove (111); and/or, the outer wall of the second bushing (40) is in interference fit with the inner wall of the second annular groove (112).
  4. 4. Valve assembly according to claim 2, wherein the end face of the first bushing (30) is arranged flush with the end face of the first ring groove (111) in the axial direction; And/or, along the axial direction, the end face of the second bushing (40) is arranged flush with the groove bottom of the first annular groove (111).
  5. 5. Valve assembly according to claim 2, characterized in that the inner wall of the first bushing (30), the inner wall of the second bushing (40) and the inner wall of the through cavity (11) near the other end are arranged flush.
  6. 6. Valve assembly according to any one of claims 1 to 5, wherein the material of the first bushing (30) and the second bushing (40) is a wear resistant material; And/or the material of each of the first bushing (30) and the second bushing (40) is the same as or different from the material of the valve seat (10); And/or the hardness of each of the first bush (30) and the second bush (40) is the same as or different from the hardness of the valve seat (10).
  7. 7. Valve assembly according to claim 6, wherein the material of the first bushing (30) is zirconia, nickel-based tungsten carbide, cobalt-based tungsten carbide, titanium carbide or boron nitride; the second lining (40) is made of zirconium oxide, nickel-based tungsten carbide, cobalt-based tungsten carbide, titanium carbide or boron nitride.
  8. 8. A fluid end of a plunger pump, characterized in that the fluid end comprises a valve housing (02) and a valve assembly (01) according to any one of claims 1 to 7; The valve box (02) is provided with a cavity (021) and a liquid channel (022), and the liquid channel (022) is communicated with the cavity (021); the valve seat (10) is arranged in the liquid channel (022), and the outer wall of the valve seat (10) is in interference fit with the inner wall of the liquid channel (022).
  9. 9. The fluid end of claim 8, wherein the fluid passage (022) comprises a first passage section (0221), a transition section (0222), and a second passage section (0223) arranged in sequence along a flow direction of the fracturing fluid; The cross-sectional area in the first channel section (0221) is smaller than the cross-sectional area in the second channel section (0223), and the transition section (0222) is provided with a first inclined surface (02221); The outer wall of one end of the valve seat (10) is provided with a second inclined surface (12), and the second inclined surface (12) is abutted with the first inclined surface (02221).
  10. 10. A fluid end according to claim 8 or 9, characterized in that at least one of the outer wall of the valve seat (10) and the inner wall of the liquid passage (022) is provided with a groove (13); The hydraulic end further comprises a sealing ring (05), and the sealing ring (05) is arranged in the groove (13).

Description

Valve component and hydraulic end of plunger pump Technical Field The application belongs to the technical field of oil and gas equipment, and particularly relates to a valve assembly and a hydraulic end of a plunger pump. Background The valve seat is a pump material commonly used in a hydraulic end assembly of the oil field plunger pump, the valve seat has the main functions of sealing and maintaining the unidirectional flow of fluid, the valve seat is matched with the valve body to be used, the valve seat and the valve body are controlled to pass through or not under the action of the pressure and the spring force of the fluid, when the fluid flows positively, the valve seat and the valve body are in an open state, the fluid can pass through, and when the fluid flows reversely, the valve seat and the valve body are in a closed state under the action of the pressure and the spring force, and the fluid can not pass through, so that the unidirectional flow of the fluid is maintained, and the backflow of the fluid is prevented. The valve seat and the valve body are opened and closed through the valve seat and the valve body, the valve seat and the valve body are opened and closed at high frequency in the operation process of the plunger pump, and the contact position is in a frequent collision state and is also a vulnerable position of the valve seat. In addition, the valve seat is mainly subjected to high-pressure fluid erosion and valve body collision in the operation process, the position subjected to high-pressure fluid erosion is located at the inner cavity position and the port position of the valve seat, the position subjected to valve body collision is located at the port position of the valve seat, the valve seat is mainly failed in the mode that a puncture pit appears at the erosion surface position of the valve seat for high-pressure fluid erosion, and the valve body collision failure mode is that an impact pit appears at the impact surface of the valve seat, even an impact crack is abnormal. In order to enhance the erosion resistance of the valve seat surface, the conventional valve seat adopts a scheme that carburizing quenching or induction quenching is carried out on the valve seat, so that the hardness of the valve seat surface is enhanced, and the wear resistance and erosion resistance of the valve seat surface are enhanced, but in practical application, the hardness value of the valve seat surface is limited due to the limitation of the material selection of a valve seat base body, the hardness value is too large, the plasticity of the material is reduced, the valve seat is easy to crack in the impact process, the hardness is not high, the impact recess is abnormal in the impact process of the valve seat, and the valve seat is invalid when the recess reaches the degree that the valve seat conical surface cannot be matched with the valve rubber for sealing. Disclosure of utility model The embodiment of the application aims to provide a valve assembly and a hydraulic end of a plunger pump, which can solve the problem that the valve seat is invalid due to damage to the inside and the port of the valve seat. In order to solve the technical problems, the application is realized as follows: The embodiment of the application provides a valve assembly, which comprises a valve seat, a valve body, a first bushing and a second bushing; The valve seat is provided with a through cavity axially arranged along the valve seat, the first bushing is annularly arranged at a port at one end of the through cavity, and the second bushing is annularly arranged in the through cavity and is in butt joint with the first bushing; The valve body is movably arranged in the first lining and the second lining along the axial direction, and is contacted with or separated from at least part of the inner surface of the first lining. The embodiment of the application also provides a hydraulic end of the plunger pump, which comprises a valve box and the valve component; The valve box is provided with a cavity and a liquid channel, and the liquid channel is communicated with the cavity; The valve seat is arranged in the liquid channel, and the outer wall of the valve seat is in interference fit with the inner wall of the liquid channel. The valve assembly in the embodiment of the application can cover the port of the through cavity of the valve seat through the first lining to play a role in protecting, effectively prevent the port of the valve seat from being damaged due to the fact that the valve body directly impacts the port of the valve seat, and also prevent the port from being damaged due to the fact that the fracturing fluid directly washes the port, and can cover the inner wall of the through cavity of the valve seat through the second lining to play a role in protecting, effectively prevent the condition that the inner wall is damaged due to the fact that the fracturing fluid directly washes the inner wall of the thro