Hydraulic end structure having replaceable plunger packing box assembly

Abstract

A hydraulic end structure having a replaceable plunger packing box assembly. The structure comprises: a valve box assembly (3), a packing assembly (4), and a power connecting plate assembly (5); the power connecting plate assembly (5) comprises connecting rods (52), bushings (53), nuts (54), and a power connecting plate (51); one end of each connecting rod (52) is connected to the valve box, and the other end of the connecting rod (52) is connected to the power connecting plate (51); and the end of each connecting rod (52) at the power connecting plate (51) is fixed by a nut (54), a bushing (53) is sleeved on the connecting rod (52), and left and right ends of the bushing (53) are respectively in contact with an end surface of the valve box and an end surface of the power connecting plate (51). The hydraulic end structure is a lightweight, long-service life hydraulic end assembly having replaceable and separable wear parts.

Description

A hydraulic end structure for a replaceable plunger packing box assembly

[0001] Cross-references

[0002] This application incorporates Chinese Patent Application No. 202410930547.5, filed on July 11, 2024, entitled "Hydraulic End Structure of a Replaceable Plunger Packing Box Assembly", which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the technical field of fracturing in the petroleum and petrochemical industry, and in particular to a hydraulic end structure of a replaceable plunger packing box assembly. Background Technology

[0004] With the upgrading of sand fracturing and acid fracturing technologies in my country and the increase in oil and gas well depth, fracturing pumps are developing towards larger displacement, higher pressure, and higher power. Simultaneously, the widespread distribution of oil and gas wells increases the requirements for the portability of fracturing equipment. The fracturing truck is the main equipment for fracturing shale oil and gas reservoirs, consisting of a transport vehicle, engine, gearbox, fracturing pump, control panel, and manifold. As a key component, the fracturing pump's technology and quality level determine the overall performance and value of the fracturing truck. Currently, shale gas and oil are mostly stored in harsh geographical environments. The hydraulic end, as a crucial component of the fracturing pump, directly impacts oil extraction costs due to its transportation, installation, and maintenance costs. Replaceable hydraulic ends are essential for cost savings and ease of installation and maintenance; therefore, new hydraulic end assemblies are needed to meet the demands of high-pressure, large-displacement, and continuous operation plunger pumps. With the advancement of unconventional oil and gas extraction, fracturing pumps, as vital equipment, should be extensively researched and developed. Based on the latest domestic development trends, research and development should focus on design concepts, standardization, serialization, generalization, and the application of new materials to promote the lightweight and high-efficiency development of high-power fracturing pumps.

[0005] The inventors have discovered that the relevant technology has at least the following problems: In response to the current demand for large-displacement, high-pressure continuous operation plunger pumps, a new type of lightweight, high-life hydraulic end assembly with replaceable and separate wear parts is needed.

[0006] Summary of the Invention

[0007] The purpose of some embodiments of this application is to provide a hydraulic end structure for a replaceable plunger packing box assembly, including a valve box structure assembly, a packing structure assembly, and a power connection plate structure assembly.

[0008] The power connection plate assembly includes a connecting rod, a bushing, a nut, and a power connection plate. One end of the connecting rod is threaded to the valve box, and the other end is connected to the power connection plate. The connecting rod at one end of the power connection plate is fixed with a nut. A bushing is fitted on the connecting rod, and the left and right ends of the bushing contact the end face of the valve box and the end face of the power connection plate, respectively.

[0009] The packing assembly includes a removable packing box, a packing component, fasteners, and seals. Tapered and cylindrical structures are located at the front and rear ends of the packing box. The packing component is housed within the packing box body, and the fasteners are installed at the head end of the packing box body. The packing box has mounting holes at both ends, including a tapered mounting hole on the valve box and an outer tapered sealing structure at one end of the removable packing box, as well as a cylindrical mounting hole on the power connection plate and an outer cylindrical sealing structure at the other end of the packing box.

[0010] In some examples, the connecting rod has threaded ends at both ends and a sleeve end in the middle. The sleeve end is not limited to a circle; it can also be polygonal.

[0011] In some cases, the bushing bore has the same shape as the middle section of the connecting rod, and there is a clearance fit.

[0012] In some examples, the power connection plate has mounting holes for mounting the packing box, and the mounting holes have lubricant injection holes in the vertical direction. The power connection plate also has mounting holes for the connecting rod and the power end.

[0013] In some examples, the tapered end of the removable packing box is provided with a sealing ring to prevent high-pressure liquid from leaking out of the valve box after installation.

[0014] In some examples, the cylindrical end of the detachable packing box is provided with a sealing ring groove and a flow ring groove that mate with the mounting hole of the power connection plate, and the flow ring groove has a lubricating fluid flow hole in the vertical direction.

[0015] In some examples, the flow-through annular groove on the cylindrical end of the removable packing box and the lubricant injection hole on the power connection plate are aligned and matched.

[0016] In some examples, the removable packing box is secured to the valve box by a packing box flange.

[0017] In some examples, the packing box flange is fixed to the packing box fixing plane of the valve box by packing box fixing screws.

[0018] In some examples, the removable packing box includes a packing box body, a packing sealing assembly, and a packing clamping nut. A tapered structure is provided at the tail end of the packing box body, the packing sealing assembly is provided inside the packing box body, and the packing sealing assembly clamping nut is removable and installed at the head end of the packing box body. Attached Figure Description

[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1 is a schematic diagram of the typical five-cylinder hydraulic end of a conventional fracturing pump.

[0021] Figure 2 is a hydraulic end assembly diagram of a replaceable plunger packing box assembly according to an embodiment of this application;

[0022] Figure 3 is a schematic cross-sectional view of the hydraulic end valve box cavity of a replaceable plunger packing box assembly according to an embodiment of this application;

[0023] Figure 4 is a schematic cross-sectional view of the hydraulic end valve box cavity of a replaceable plunger packing box assembly according to an embodiment of this application;

[0024] Figure 5 is a structural diagram of a replaceable plunger packing box according to an embodiment of this application;

[0025] Figure 6 is a structural diagram of the connecting rod according to an embodiment of this application;

[0026] Figure 7 is a bushing structure diagram according to an embodiment of this application;

[0027] Figure 8 is a structural diagram of the power connection plate according to an embodiment of this application;

[0028] Figure 9 is a structural diagram of the power connection plate and the oil injection hole of the detachable packing box according to an embodiment of this application. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, some embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0030] This application relates to a hydraulic end structure for a replaceable plunger packing box assembly, comprising a valve box structure assembly 3, a packing structure assembly 4, and a power connection plate structure assembly 5. This design reduces manufacturing difficulty, not only lightens the weight of the valve box but also improves the service life and maintainability of the hydraulic end.

[0031] It should be noted that this application uses a five-cylinder hydraulic end valve box as a typical example. This example can be extended to hydraulic end valve boxes with more or fewer plunger orifices. Figure 1 shows the overall structure of a conventional hydraulic end, where the connecting plate 2 and the valve box 1 are a single unit. Figure 2 shows the hydraulic end assembly structure with a replaceable plunger packing box assembly, where the power connecting plate assembly 5 and the valve box assembly 3 are separate and independent.

[0032] Figures 3 and 4 are schematic cross-sectional views of the hydraulic end cavity of the replaceable plunger packing box assembly. As can be seen from the figures, the power connection plate assembly includes a connecting rod 52, a bushing 53, a nut 54, and a power connection plate 51. One end of the connecting rod 52 is connected to the valve box 3, and the other end is connected to the power connection plate 51. The connecting rod 52 at one end of the power connection plate 51 is fixed with a nut 54. A bushing 53 is fitted on the connecting rod 52. The left and right ends of the bushing 53 contact the end face of the valve box 3 and the end face of the power connection plate 51, respectively.

[0033] In some embodiments, as shown in FIG5, the packing assembly structure includes a detachable packing box 41, a packing assembly 42, a fastener 43, a packing box conical seal 44, and a packing box cylindrical seal 45. A tapered structure 411 and a cylindrical structure 412 are disposed at the front and rear ends of the packing box 41, the packing assembly 42 is disposed within the body of the packing box 41, and the fastener 43 is installed at the head end of the packing box 41. The tapered structure 411 of the packing box 41 seals against the tapered mounting hole on the valve box 3, and a sealing groove 413 is provided on the tapered structure 411. The cylindrical structure 412 of the packing box 41 is provided with two sealing grooves 414, and a flow hole 415 is provided between the two sealing grooves 414.

[0034] As shown in Figure 6, the connecting rod 52 has a threaded end 521 that mates with the valve box 3 at one end, a threaded end 523 that mates with the power connecting plate 51 at the other end, and a sleeve end 522 in the middle. The sleeve end 522 is not limited to a cylindrical shape.

[0035] As shown in Figure 7, the bushing 53 has an inner hole 531 that is identical in shape to the sleeve end 522 of the connecting rod 52 and has a clearance fit. The outer circle is provided with a positioning arc groove 533 and an installation arc groove 532 for the nut 54.

[0036] As shown in Figure 8, the power connection plate 51 is provided with an assembly hole 511 for installation with the detachable packing box 41, a through hole 512 for connecting the connecting rod 52, and a large pump pull rod hole 513 for connecting with the power end. A lubricating fluid injection hole 514 is provided in the vertical direction of the assembly hole 511.

[0037] As shown in Figure 9, the injection hole 514 and the flow hole 415 are aligned axially, and the injection hole 514 is located between the two sealing grooves 414.

[0038] This application has at least the following beneficial effects:

[0039] 1. This application significantly reduces the bulky connection end of the original valve box, reduces the blank size, and lowers the processing difficulty.

[0040] 2. This application effectively avoids damage or scrapping of the entire valve box caused by erosion at one packing location.

[0041] 3. The valve box, packing box body and power connection plate of this application can be made of different materials, which can reduce the material cost of the packing box body and power connection plate compared with the old structure.

Claims

1. A lightweight hydraulic end assembly structure with a replaceable plunger packing box assembly, comprising a valve box structure assembly, a packing structure assembly, and a power connection plate structure assembly, wherein, The power connection plate assembly includes a connecting rod, a bushing, a nut, and a power connection plate. One end of the connecting rod is connected to the valve box, and the other end is connected to the power connection plate. The connecting rod at one end of the power connection plate is fixed with a nut. A bushing is fitted on the connecting rod, and the left and right ends of the bushing contact the end face of the valve box and the end face of the power connection plate, respectively.

2. The lightweight hydraulic end assembly structure of the replaceable plunger packing box assembly according to claim 1, wherein, The packing structure assembly includes a removable packing box, a packing assembly, fasteners, and seals. A tapered structure and a cylindrical structure are disposed at the front and rear ends of the removable packing box. The packing assembly is disposed within the removable packing box body. Fasteners are installed at the head end of the removable packing box body. The fittings at both ends of the removable packing box have mounting holes, including a tapered mounting hole on the valve box and a sealing groove on the tapered structure of the removable packing box, as well as a cylindrical mounting hole on the power connection plate and a sealing groove on the cylindrical structure of the packing box.

3. The lightweight hydraulic end assembly structure of the replaceable plunger packing box assembly according to claim 2, wherein, The connecting rod has a threaded end that fits into the valve box at one end, a threaded end that fits into the power connection plate at the other end, and a sleeve end in the middle, which is not limited to a cylindrical shape.

4. The lightweight hydraulic end assembly structure of the replaceable plunger packing box assembly according to claim 3, wherein, The inner hole of the bushing described in the tube is consistent with the outer shape of the sleeve end and has a clearance fit. The outer circle is provided with a positioning arc groove and a nut installation arc groove. The outer circle arc groove is not limited to an arc shape and can be modified according to the actual mating surface.

5. The lightweight hydraulic end assembly structure of the replaceable plunger packing box assembly according to claim 4, wherein, The power connection plate has mounting holes for mounting a detachable packing box. The mounting holes have vertically arranged lubricant injection holes. The power connection plate also has mounting holes for connecting rods and large pump rods.

6. The lightweight hydraulic end assembly structure of the replaceable plunger packing box assembly according to claim 5, wherein, The tapered structure on the detachable packing box is equipped with a seal to prevent high-pressure liquid from leaking out of the valve box after installation.

7. The lightweight hydraulic end assembly structure of a replaceable plunger packing box assembly according to claim 6, wherein, The detachable packing box has a cylindrical structure with a sealing groove and a flow hole that mate with the assembly hole.

8. The lightweight hydraulic end assembly structure of a replaceable plunger packing box assembly according to claim 7, wherein, The injection hole and the flow hole on the detachable packing box are axially aligned, and the diameter of the injection hole should be between the two sealing grooves.

9. The lightweight hydraulic end assembly structure of a replaceable plunger packing box assembly according to claim 8, wherein, The detachable packing box is fixed to the valve box by the packing box flange.

10. The lightweight hydraulic end assembly structure of a replaceable plunger packing box assembly according to claim 9, wherein, The packing box flange is fixed to the packing box fixing plane of the valve box by packing box fixing screws.

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