A hydraulic end of a plunger pump

Abstract

The present invention discloses a hydraulic end of a plunger pump, which includes a valve box and a plunger arranged in the valve box, a packing seal assembly, a valve assembly, a valve spring seat, a discharge gland, a discharge nut, a suction gland and a suction nut. The valve spring seat includes a protrusion, a connecting member and fins. The connecting member is respectively connected to the protrusion and the fins. There are 2 fins, and the 2 fins are arranged oppositely. A receiving cavity is formed on the valve box, and the receiving cavity is used for receiving the fins. Beneficial effects: By changing the structure of the valve spring seat and the installation and fixing method of the valve spring seat and the valve box, the installation and disassembly are simpler and faster, and at the same time, the service life of the hydraulic end is improved. The end face of the plunger and the suction gland is changed to an arc surface to facilitate the internal fluid flow. By adding a limiting protrusion, the valve spring seat can be prevented from rotating and falling off left and right. Both the first sealing ring and the second sealing ring are arranged on the valve box, so that the wear is transferred to the vulnerable parts, and the service life of the valve box is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of the hydraulic end of a plunger pump, and particularly relates to a hydraulic end of a plunger pump. Background Art

[0002] At present, fracturing construction in oil and gas field exploitation is the main production-increasing method. Among them, the plunger pump, as the core component of the entire fracturing equipment, needs to continuously improve its service life to meet the requirements of long-term fracturing operations. The service life of the hydraulic end in the plunger pump is the key to affecting the construction. The fracturing fluid or sand-carrying fluid enters through the low-pressure port of the hydraulic end, and pressurizes the medium in the valve box of the hydraulic end during the reciprocating movement of the plunger, and enters the bottom of the well through the high-pressure pipeline. During the operation process, the main damage forms of the hydraulic end are that the valve box cracks and the sealing surface of the valve box wears. If the high-pressure liquid leaks, it will have a great impact on personal safety and operation efficiency. After analysis, the valve box mainly has large stress at the intersection line due to grooves on the inner wall of the valve box, and the sealing surface of the valve box fails due to the rapid creep of the sealing ring under the action of the liquid alternating load, which causes wear to the valve box. Therefore, to improve the service life of the hydraulic end, these two aspects of problems must be solved. Summary of the Invention

[0003] The object of the present invention is to overcome the deficiencies of the prior art and provide a hydraulic end of a plunger pump. By changing the structure of the valve spring seat and the installation and fixation method of the valve spring seat and the valve box, the installation and disassembly of the two are made simpler and faster, and at the same time, the service life of the hydraulic end is improved. 2. The end faces of the plunger and the suction gland are changed to arc surfaces to facilitate the internal fluid flow. 3. By adding a limit protrusion on the suction gland, the valve spring seat can be prevented from rotating and falling off left and right. 4. Both the first sealing ring and the second sealing ring are arranged on the valve box, so that the wear is transferred to the vulnerable parts (the suction gland and the discharge gland), and the service life of the valve box is improved.

[0004] The object of the present invention is achieved by the following technical measures: A hydraulic end of a plunger pump includes a valve box, a plunger, a packing seal assembly, a valve assembly, a valve spring seat, a discharge gland, a discharge cap, a suction gland, and a suction cap. An intake chamber and a discharge chamber are vertically arranged inside the valve box, a packing chamber and a suction gland chamber are horizontally arranged inside the valve box. A valve assembly and a valve spring seat are arranged in the intake chamber, the valve assembly and the valve spring seat are connected. In the discharge chamber, a valve assembly, a discharge gland, and a discharge cap are arranged in sequence from inside to outside, the valve assembly is connected to the discharge gland, and the discharge cap is used to press the discharge gland. In the packing chamber, the plunger is hermetically connected to the valve box through the packing seal assembly. In the suction gland chamber, a suction gland and a suction cap are arranged. The valve spring seat includes a protrusion, a connecting member, and fins. The bottom of the connecting member is connected to the protrusion, the protrusion is connected to the valve assembly in the discharge chamber, the upper part of the connecting member is connected to the fins, there are 2 fins, and the 2 fins are arranged oppositely. A receiving cavity is opened on the valve box, and the receiving cavity is used to receive the fins.

[0005] Further, the cross-section of the fin is a conical surface.

[0006] Further, the end face of the plunger is arc-shaped.

[0007] Further, the end face of the plunger is an outer arc shape.

[0008] Further, the end face of the suction gland is arc-shaped.

[0009] Further, the end face of the suction gland is an inner arc shape.

[0010] Further, a limiting protrusion extends from the inner arc-shaped end face of the suction gland, and the limiting protrusion is used to limit the fins of the valve spring seat.

[0011] Further, the discharge gland and the valve box are sealingly connected through a first sealing ring, and the first sealing ring is embedded

[0012] on the valve box.

[0013] Further, the first sealing ring is a D-shaped sealing ring.

[0014] Further, the suction gland and the valve box are sealingly connected through a second sealing ring, and the second sealing ring is embedded on the valve box.

[0015] Further, the second sealing ring is a D-shaped sealing ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By changing the structure of the valve spring seat and the installation and fixing method of the valve spring seat and the valve box, the installation and disassembly of the two are made simpler and faster. More importantly, the stress at the intersection line of the horizontal and vertical cavities in the valve box is reduced, and the service life of the hydraulic end is improved. 2. The end faces of the plunger and the suction gland are changed to arc surfaces to facilitate the flow of internal fluid. 3. By adding a limiting protrusion on the suction gland, the valve spring seat can be prevented from rotating and falling off left and right. 4. The first sealing ring and the second sealing ring are both arranged on the valve box, so that the wear is transferred to the vulnerable parts (the suction gland and the discharge gland), and the service life of the valve box is improved.

[0017] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Description of the Drawings

[0018] Figure 1 is a cross-sectional view of the hydraulic end of the plunger pump.

[0019] Figure 2 is a schematic structural diagram of the valve spring seat.

[0020] Figure 3It is a schematic structural diagram of the installation of the valve spring seat and the valve box accommodation cavity.

[0021] Figure 4 It is a sectional view of the suction gland.

[0022] Among them, 1. Valve box, 2. Plunger, 3. Packing seal assembly, 4. Valve assembly, 5. Valve spring seat, 6. Discharge gland, 7. Discharge compression nut, 8. Suction gland, 9. Suction compression nut, 10. First sealing ring, 11. Second sealing ring, 12. Fin, 13. Projection, 14. Connecting piece, 15. Accommodation cavity, 16. Limit projection, 17. Through hole. Specific implementation mode

[0023] As Figures 1 to 4 shown, a hydraulic end of a plunger pump includes a valve box 1, a plunger 2, a packing seal assembly 3, and a valve assembly

[0024] 4. Valve spring seat 5, discharge gland 6, discharge compression nut 7, suction gland 8 and suction compression nut 9. An intake cavity and a discharge cavity are provided vertically inside the valve box 1. A packing cavity and a suction gland 8 cavity are provided horizontally inside the valve box 1. A valve assembly 4 and a valve spring seat 5 are provided in the intake cavity. The valve assembly 4 is connected to the valve spring seat 5. In the discharge cavity, a valve assembly 4, a discharge gland 6 and a discharge compression nut 7 are arranged in sequence from inside to outside. The valve assembly 4 is connected to the discharge gland 6. The discharge compression nut 7 is used to press the discharge gland 6. In the packing cavity, the plunger 2 is hermetically connected to the valve box 1 through a packing seal assembly 3. A suction gland 8 and a suction compression nut 9 are provided in the suction gland 8 cavity. The valve spring seat 5 includes a protrusion 13, a connecting member 14 and fins 12. The bottom of the connecting member 14 is connected to the protrusion 13. The protrusion 13 is connected to the valve assembly 4 in the discharge cavity. The upper part of the connecting member 14 is connected to the fins 12. There are 2 fins 12, and the 2 fins 12 are arranged oppositely. A receiving cavity 15 is formed on the valve box 1, and the receiving cavity 15 is used to receive the fins 12. The valve assembly 4 includes a valve body, a valve seat and a valve spring. One end of the valve body is connected to the valve spring, and the other end of the valve body is connected to the valve seat. In the discharge cavity, it is connected to the discharge gland 6 through a valve spring. The valve spring in the intake cavity is connected to the valve spring seat 5. The packing seal assembly 3 includes a packing spacer ring, a packing wrap, a packing compression ring, a packing compression nut, etc. The valve assemblies 4 in the intake cavity and the discharge cavity function as one-way valves for sucking in low-pressure liquid and discharging high-pressure liquid. The plunger 2 reciprocates horizontally in the packing cavity. The valve spring seat 5 is used to limit the valve spring in the intake cavity. The structure of the valve spring seat 5 in this application is simple, and the disassembly and assembly with the valve box 1 are very convenient, avoiding the complex installation of the valve spring seat 5 in the prior art, that is, there is no need to open a slot in the valve box 1, and there is no need to insert the valve spring seat 5 into the slot, so as to fix the valve spring seat 5, reduce the stress at the intersection of the horizontal and vertical cavities in the valve box 1, and improve the service life of the hydraulic end.

[0025] The cross-section of the fin 12 is a conical surface. The design of the conical fin 12 can well fix the valve spring seat 5 on the valve box 1 and play a limiting role.

[0026] The end face of the plunger 2 is arc-shaped. Specifically, the end face of the plunger 2 is an outer arc. When the plunger 2 moves rapidly towards the suction gland 8 direction in the packing cavity, the fluid between the plunger 2 and the suction gland 8 will be compressed sharply. The arc surface of the plunger 2 helps the fluid to disperse in all directions in time. On the one hand, it can reduce the force on the suction gland 8 and the suction compression nut 9, and on the other hand, it can greatly reduce the cavitation damage between the plunger 2 and the valve box 1.

[0027] The end face of the suction gland 8 is arc-shaped. The end face of the suction gland 8 is an inner arc.

[0028] A limiting projection 16 extends from the arcuate end face inside the suction gland 8. The limiting projection 16 is used to limit the fin 12 of the valve spring seat 5 to prevent the valve spring seat 5 from rotating and disengaging from the accommodation cavity 15 under the impact of liquid.

[0029] The limiting projection 16 can be a small section of a ring or a complete circular ring. When it is a circular ring, a through hole 17 can be provided in the limiting projection 16. The through hole 17 facilitates the flow of the inhaled fluid, avoids the impact of the inhaled fluid on the limiting projection 16 during the pressurization process, and at the same time, minimizes the change in the fluid flow direction as much as possible to avoid the impact of the fluid diversion on the suction gland 8 and the valve box 1, thereby protecting the suction gland 8 and the valve box 1.

[0030] The discharge gland 6 and the valve box 1 are sealed and connected through a first sealing ring 10, and the first sealing ring 10 is embedded on the valve box 1. The first sealing ring 10 is a D-shaped sealing ring. The suction gland 8 and the valve box 1 are sealed and connected through a second sealing ring 11, and the second sealing ring 11 is embedded on the valve box 1. The second sealing ring 11 is a D-shaped sealing ring. By arranging both the first sealing ring 10 and the second sealing ring 11 on the valve box 1, the wear is transferred to the vulnerable parts (the suction gland 8 and the discharge gland 6). Under the action of high-pressure alternating loads, the first sealing ring 10 and the second sealing ring 11 respectively wear the suction gland 8 and the discharge gland 6, rather than wearing the valve box 1, thereby protecting the sealing surface of the valve box 1 and extending the service life of the valve box 1.

[0031] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic end of a plunger pump, characterized in that: It includes a valve box, a plunger, a packing seal assembly, a valve assembly, a valve spring seat, a discharge gland, a discharge compression nut, a suction gland and a suction compression nut. An intake chamber and a discharge chamber are provided vertically inside the valve box. A packing chamber and a suction gland chamber are provided horizontally inside the valve box. A valve assembly and a valve spring seat are arranged in the intake chamber. The valve assembly is connected to the valve spring seat. In the discharge chamber, a valve assembly, a discharge gland and a discharge compression nut are arranged in sequence from inside to outside. The valve assembly is connected to the discharge gland, and the discharge compression nut is used to compress the discharge gland. In the packing chamber, the plunger is hermetically connected to the valve box through the packing seal assembly. In the suction gland chamber, a suction gland and a suction compression nut are provided. The valve spring seat includes a protrusion, a connecting member and fins. The bottom of the connecting member is connected to the protrusion, and the protrusion is connected to the valve assembly in the discharge chamber. The upper part of the connecting member is connected to the fins, and the fins fix the valve spring seat on the valve box. There are 2 fins, and the 2 fins are arranged oppositely. A receiving cavity is formed on the valve box, and the receiving cavity is used to receive the fins. The cross section of the fin is a conical surface. The end face of the suction gland is arc-shaped, and a limiting protrusion extends from the inner arc-shaped end face of the suction gland. The limiting protrusion is used to limit the fins of the valve spring seat, and a through hole is formed on the limiting protrusion.

2. The hydraulic end of the plunger pump according to claim 1, characterized in that: The end face of the plunger is arc-shaped.

3. The hydraulic end of the plunger pump according to claim 2, characterized in that: The end face of the plunger is outwardly arc-shaped.

4. The hydraulic end of the plunger pump according to claim 1, characterized in that: The end face of the suction gland is inwardly arc-shaped.

5. The hydraulic end of the plunger pump according to claim 1, characterized in that: The discharge gland is hermetically connected to the valve box through a first sealing ring, and the first sealing ring is embedded on the valve box.

6. The hydraulic end of the plunger pump according to claim 5, characterized in that: The first sealing ring is a D-shaped sealing ring.

7. The hydraulic end of the plunger pump according to claim 1, wherein: The suction gland is hermetically connected to the valve box through a second sealing ring, and the second sealing ring is embedded on the valve box.

8. The hydraulic end of the plunger pump according to claim 7, characterized in that: The second sealing ring is a D-shaped sealing ring.

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