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CN-224214351-U - Hydraulic end of plunger pump and plunger pump

CN224214351UCN 224214351 UCN224214351 UCN 224214351UCN-224214351-U

Abstract

The application discloses a hydraulic end of a plunger pump and the plunger pump, and relates to the field of oil and gas equipment. The hydraulic end of the plunger pump comprises a valve box and a valve assembly, wherein the valve box is provided with a cavity and a liquid channel communicated with the cavity, the liquid channel comprises a first channel section, a second channel section and a transition section, the first channel section, the transition section and the second channel section are sequentially communicated along the flow direction of fracturing liquid, the cross section area in the first channel section is smaller than the cross section area in the second channel section, a first inclined surface circumferentially arranged along the circumferential direction of the transition section is arranged in the transition section, the valve assembly comprises a valve seat, the outer wall of one end of the valve seat is provided with a second inclined surface circumferentially arranged along the circumferential direction of the valve seat, the valve seat is arranged on the second channel section, and the second inclined surface is in butt joint with the first inclined surface. The application can solve the problems of cracking of the transition zone of the valve seat and the like.

Inventors

  • LI XIAOBIN
  • XU CHENG
  • 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. A hydraulic end of a plunger pump is characterized in that the hydraulic end comprises a valve box (10) and a valve assembly (20); The valve box (10) is provided with a cavity (11) and a liquid channel (12) communicated with the cavity (11), the liquid channel (12) comprises a first channel section (121), a second channel section (123) and a transition section (122), the first channel section (121), the transition section (122) and the second channel section (123) are sequentially communicated along the flow direction of fracturing fluid, the cross section area in the first channel section (121) is smaller than the cross section area in the second channel section (123), and a first inclined surface (1221) circumferentially arranged along the circumference of the transition section (122) is arranged in the transition section (122); The valve assembly (20) comprises a valve seat (21), a second inclined surface (211) which is arranged along the circumferential direction of the valve seat (21) is arranged on the outer wall of one end of the valve seat (21), the valve seat (21) is arranged on the second channel section (123), and the second inclined surface (211) is abutted to the first inclined surface (1221).
  2. 2. A fluid end according to claim 1, characterized in that the angle between the direction of the oblique extension of the first inclined surface (1221) and the axial direction of the liquid channel (12) is in the range of 25 ° to 70 °.
  3. 3. A fluid end according to claim 1, wherein the second inclined surface (211) is connected to an end surface of one end of the valve seat (21); at least part of the second inclined surface (211) extends to the first channel section (121), and the end surface of one end of the valve seat (21) is opposite to the first channel section (121).
  4. 4. A fluid end according to any one of claims 1 to 3, characterized in that the first inclined surface (1221) and the second inclined surface (211) are both conical surfaces.
  5. 5. A fluid end according to any one of claims 1 to 3, characterized in that the fluid channel (12) comprises a fluid inlet channel (12 a) and a fluid outlet channel (12 b); In the liquid inlet channel (12 a), the first channel section (121) is far away from the cavity (11), and the second channel section (123) is near to the cavity (11); In the liquid outlet channel (12 b), the first channel section (121) is arranged close to the cavity (11), and the second channel section (123) is arranged far away from the cavity (11).
  6. 6. The fluid end according to claim 1, characterized in that the first inclined surface (1221) abuts the second inclined surface (211); and/or, the outer wall of the valve seat (21) is in interference fit with the inner wall of the second channel section (123).
  7. 7. A fluid end according to claim 1 or 6, characterized in that at least one of the outer wall of the valve seat (21) and the inner wall of the second channel section (123) is provided with a groove (212); The hydraulic end further comprises a sealing ring (30), and the sealing ring (30) is arranged in the groove (212).
  8. 8. A fluid end according to claim 1, characterized in that the end face of the other end of the valve seat (21) facing away from the second inclined surface (211) is flush with the port of the second channel section (123); Or the end surface of the other end of the valve seat (21) facing away from the second inclined surface (211) protrudes out of the port of the second channel section (123); or the port of the second channel section (123) protrudes out of the end surface of the other end of the valve seat (21) facing away from the second inclined surface (211).
  9. 9. A fluid end according to claim 1, characterized in that the valve seat (21) is made of metal steel, including alloy steel, carbon steel or stainless steel; Or the valve seat (21) is made of a metal wear-resistant material or a nonmetal wear-resistant material, and comprises zirconia, nickel-based tungsten carbide, cobalt-based tungsten carbide, titanium carbide, boron nitride or ceramic.
  10. 10. A plunger pump comprising a fluid end as claimed in any one of claims 1 to 9.

Description

Hydraulic end of plunger pump and plunger pump Technical Field The application belongs to the technical field of oil and gas equipment, and particularly relates to a hydraulic end of a plunger pump and the plunger pump. Background In the development process of oil and gas fields, the fracturing process is a main method for improving the yield of oil and gas reservoirs, the construction process is mainly realized by fracturing pumping equipment, and the fracturing process has the functions of injecting high-pressure and large-displacement fracturing fluid into the oil and gas reservoirs, fracturing stratum, extruding propping agent into cracks to form artificial cracks and diversion channels, and improving the oil and gas recovery ratio. The working principle of the hydraulic end is that working medium enters an alternating cavity in the hydraulic end from a liquid inlet through a lower valve body and a lower valve seat, then the working medium entering the alternating cavity is compressed to a certain pressure under the pushing compression of a plunger, after the pressure reaches a certain degree, the upper valve body is opened, and then the working medium enters a high-pressure cavity and is discharged from a liquid outlet. It can be seen that the alternating chamber and the parts in contact with the liquid in the alternating chamber are subjected to alternating loads during the reciprocating movement of the plunger. The valve seat is a pump material commonly used in a hydraulic end assembly of the plunger pump in an oil field, 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 by the action of fluid pressure and spring force, 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 pressure and spring force, the fluid can not pass through, so that the unidirectional flow of the fluid is maintained, the backflow of the fluid is prevented, the plunger reciprocates once in the operation process of the plunger pump, and the valve body is switched once. In the related art, the valve seat is limited by the valve seat supporting surface, so that the cracking condition of a valve seat transition zone often occurs in the operation process, and after the valve seat transition zone is cracked, a high-pressure working medium leaks along the cracked position, so that the valve box is broken, and great loss is caused. Disclosure of utility model The embodiment of the application aims to provide a hydraulic end of a plunger pump and the plunger pump, which can solve the problems of cracking of a transition zone of a valve seat and the like. In order to solve the technical problems, the application is realized as follows: the embodiment of the application provides a hydraulic end of a plunger pump, which comprises a valve box and a valve assembly; The valve box is provided with a cavity and a liquid channel communicated with the cavity, the liquid channel comprises a first channel section, a second channel section and a transition section, the first channel section, the transition section and the second channel section are sequentially communicated along the flow direction of fracturing fluid, the cross section area in the first channel section is smaller than the cross section area in the second channel section, and a first inclined surface circumferentially arranged along the transition section is arranged in the transition section; The valve assembly comprises a valve seat, a second inclined surface which is circumferentially arranged along the valve seat is arranged on the outer wall of one end of the valve seat, the valve seat is arranged on the second channel section, and the second inclined surface is in butt joint with the first inclined surface. The embodiment of the application also provides a plunger pump which comprises the hydraulic end. Compared with the prior art that a step structure is arranged on the outer wall of the valve seat to support the step structure through the valve box, the valve seat and the valve box are matched through the abutting of the first inclined surface and the second inclined surface, and a transition area structure formed by the step support is eliminated, so that the problem of cracking caused by stress concentration in the step transition area of the valve seat can be effectively relieved, and the situation that fracturing fluid leaks along a cracking position to cause the valve box to be broken after the valve seat is cracked is effectively prevented. Drawings FIG. 1 is a schematic cross-sectional view of a fluid end according to an embodiment of the present application; FIG. 2 is a partial schematic view of a valve assembly according to an