Plunger and fluid end

Abstract

The utility model discloses a plunger and a fluid end, and relates to the fields of oil gas, mines and the like. A plunger is applied to a fluid end and comprises a first end portion and a second end portion which are arranged at the two ends in the axial direction of the plunger. The first end part is used for bearing a driving effect; the second end is used for being arranged in a valve box of the fluid end, and a sunken groove is formed in the end face of the second end and used for containing part of the structure located at the fluid end. The problem that the manufacturing cost and the transportation cost are increased due to the large width size of the hydraulic end can be solved.

Description

Technical Field

[0001] This application belongs to the technical field of oil and gas, mining, etc., and specifically relates to a plunger and hydraulic end. Background Technology

[0002] In related technologies, a plunger pump may include components such as a valve box, a valve assembly, a valve seat, and a plunger. The valve box has a communicating cavity and a plunger orifice. The valve assembly and valve seat are both located within the cavity, and the plunger slides within the plunger orifice. As the plunger reciprocates, liquid can enter and exit the valve box, thereby pressurizing the liquid.

[0003] However, since the valve assembly and valve seat are both located inside the cavity, in order to avoid the plunger being affected by the reciprocating movement of the plunger caused by the valve assembly and valve seat, it is necessary to increase the width of the hydraulic end of the plunger pump in the reciprocating movement direction of the plunger. This results in a large volume of the hydraulic end of the plunger pump, increasing manufacturing and transportation costs. Utility Model Content

[0004] The purpose of this application is to provide a plunger and hydraulic end that can solve the problems of increased manufacturing and transportation costs due to the large width of the hydraulic end.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application provides a plunger for use in a hydraulic system, the plunger comprising: a first end and a second end disposed opposite to each other along the axial direction of the plunger;

[0007] The first end is used to withstand the driving force;

[0008] The second end is used to be disposed in the valve box of the hydraulic end, and the end face of the second end is provided with a recessed groove, which is used to accommodate a part of the structure located in the hydraulic end.

[0009] This application embodiment also provides a hydraulic end, including: a valve box, a suction valve guide seat, and the aforementioned plunger;

[0010] The valve box is provided with a valve chamber and a plunger channel that are connected. The suction valve guide seat is located in the valve chamber near the plunger channel. The plunger is movably located in the plunger channel and can be moved into the valve chamber.

[0011] With the plunger in the forward dead center position, at least a portion of the suction valve guide seat is located in the recessed groove.

[0012] This application optimizes the plunger structure by creating a recessed groove on the end face of the second end of the plunger. The end with the recessed groove is positioned within the valve box. As the plunger moves towards the valve box, a portion of the hydraulic end structure gradually enters the recessed groove. This groove provides clearance for certain structures, preventing collisions between the second end of the plunger and these structures, thus ensuring normal reciprocating movement of the plunger. Compared to a flat end face, this design allows for a reduction in the width of the valve box without altering the plunger's range of motion, further minimizing the volume of the hydraulic end and facilitating transportation while reducing costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the plunger structure disclosed in the embodiments of this application;

[0014] Figure 2 This is a cross-sectional schematic diagram of the plunger disclosed in an embodiment of this application;

[0015] Figure 3 This is a partial cross-sectional schematic diagram of the hydraulic end disclosed in the embodiments of this application.

[0016] Explanation of reference numerals in the attached figures:

[0017] 10-Plunger;

[0018] 11-First end; 111-Annular groove; 112-Annular protrusion;

[0019] 12-Second end; 121-Recessed groove; 1211-Groove opening; 1212-Groove bottom; 122-Disassembly / assembly hole; 123-Transition hole;

[0020] 13-Weight reduction hole;

[0021] 20 - Valve box; 21 - Valve chamber; 22 - Plunger passage;

[0022] 30 - Suction valve guide seat;

[0023] 40 - Inhalation valve assembly. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0026] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0027] refer to Figures 1 to 3 This application discloses a plunger 10 applied to a hydraulic end. Optionally, the hydraulic end can be the hydraulic end of a pump, such as the hydraulic end of a fracturing pump, etc. Of course, it can also be the hydraulic end of other devices, which is not specifically limited here. The hydraulic end may also include a valve box 20 or other structures, and the plunger 10 is movably disposed in the valve chamber 21 of the valve box 20. The disclosed plunger 10 includes a first end 11 and a second end 12, and the first end 11 and the second end 12 are respectively disposed at both ends of the plunger 10 along the axial direction of the plunger 10.

[0028] The first end 11 is used to bear the driving force. Optionally, the first end 11 can be used to drive the connection with the power end, through which the power end can apply a driving force to the first end 11 of the plunger 10 so that the plunger 10 can reciprocate.

[0029] The second end 12 is used to be installed in the valve box 20 of the hydraulic end. When the plunger 10 moves back and forth, the second end 12 can move back and forth in the valve box 20 to pressurize or release the fluid (such as fracturing fluid).

[0030] The end face of the second end 12 is provided with a recessed groove 121, which is used to accommodate a portion of the structure located at the hydraulic end. Optionally, the portion of the structure at the hydraulic end may include a valve assembly, a valve seat, a suction valve guide seat 30, etc. Of course, it may also include other structures, which are not specifically limited here. In addition, some structures may be disposed within the valve box 20 to facilitate control of liquid inlet or outlet from the valve box 20.

[0031] Based on the above configuration, this embodiment optimizes the structure of the plunger 10, forming a recessed groove 121 on the end face of the second end 12 of the plunger 10. The end containing the recessed groove 121 is positioned within the valve box 20. Thus, as the plunger 10 moves towards the valve box 20, the hydraulic end portion of the structure gradually enters the recessed groove 121. In other words, the recessed groove 121 provides clearance space for some structures, preventing collisions between the second end 12 of the plunger 10 and other structures, ensuring the normal reciprocating movement of the plunger 10. Compared to a flat end face for the second end 12, without changing the range of motion of the plunger 10, this approach helps reduce the width of the valve box 20, further minimizing the volume of the hydraulic end, thereby facilitating transportation and reducing transportation costs.

[0032] refer to Figure 2 In some embodiments, the cross-sectional area at the opening 1211 of the recessed groove 121 is larger than the cross-sectional area at the bottom 1212 of the recessed groove 121. That is, the recessed groove 121 forms a flared structure at the opening 1211. In this way, during the reciprocating movement of the plunger 10, part of the structure can enter the recessed groove 121, thereby avoiding the partial structure from blocking the movement of the plunger 10 and ensuring the normal reciprocating movement of the plunger 10.

[0033] Optionally, the groove wall of the recessed groove 121 can be a conical surface, such as a conical surface, a pyramidal surface, etc. Of course, it can also be other shapes, which are not specifically limited here.

[0034] In some more specific embodiments, the longitudinal section of the recessed groove 121 is trapezoidal.

[0035] In some other embodiments, the cross-sectional area of ​​the recessed groove 121 along the axial direction of the plunger 10 can remain unchanged. In this case, the recessed groove 121 can also provide sufficient space for the accommodating part of the structure to ensure that the plunger 10 can move back and forth normally.

[0036] Optionally, the groove wall of the recessed groove 121 can be a cylindrical surface, such as a cylindrical surface, a prism surface, etc. Of course, it can also be other shapes, which are not specifically limited here.

[0037] In some more specific embodiments, the longitudinal section of the recessed groove 121 is rectangular.

[0038] In some other embodiments, the cross-sectional area at the opening 1211 of the recessed groove 121 can be smaller than the cross-sectional area at the bottom 1212 of the recessed groove 121. That is, the recessed groove 121 forms a narrowing structure at the opening 1211. This method can also avoid some structures from blocking the movement of the plunger 10 and ensure the normal reciprocating movement of the plunger 10.

[0039] In some embodiments, the opening 1211 of the recessed groove 121 can be circular, elliptical, square, rectangular, etc., and of course, it can also be other irregular shapes, which are not specifically limited here.

[0040] In some embodiments, the cross-sectional area of ​​the recessed groove 121 at the groove opening 1211 is greater than the maximum cross-sectional area of ​​the partial structure. Based on this, the partial structure can smoothly enter the recessed groove 121, thereby avoiding the second end 12 of the plunger 10, preventing the second end 12 from colliding with the partial structure during the reciprocating movement of the plunger 10, and ensuring that the plunger 10 can reciprocate normally.

[0041] Continue to refer to Figure 2 In some embodiments, the bottom 1212 of the recessed groove 121 may be provided with a disassembly hole 122, which extends axially along the plunger 10. Based on this, the plunger 10 can be disassembled or assembled by installing a disassembly tool in the disassembly hole 122.

[0042] Specifically, when it is necessary to disassemble or assemble the plunger 10, the disassembly or assembly tool can be installed into the disassembly or assembly hole 122, and then a force can be applied to the disassembly or assembly tool to move the plunger 10, thereby realizing the disassembly or assembly of the plunger 10.

[0043] In some embodiments, the disassembly hole 122 can be a threaded hole, so that the disassembly tool can be screwed into the disassembly hole 122 by means of threads, so as to apply disassembly force to the plunger 10 by means of the disassembly tool.

[0044] In other embodiments, the disassembly hole 122 can be a stepped hole, in which the disassembly tool can be snapped or hooked into the stepped hole, and then a force is applied to the disassembly tool, which drives the plunger 10 to move, thereby realizing the disassembly and assembly of the plunger 10.

[0045] Optionally, the stepped hole can be divided into multiple segments. Along the axial direction of the plunger 10, the cross-sectional area of ​​the segment closer to the second end 12 is larger than that of the segment farther from the second end 12. In this way, a stepped structure can be formed at the connection of the segments to facilitate the snapping or hooking of disassembly and assembly tools.

[0046] In some embodiments, the disassembly hole 122 may be provided with a transition hole 123 at one end near the bottom 1212 of the recessed groove 121, and the cross-sectional area of ​​the transition hole 123 at one end near the bottom 1212 is greater than the cross-sectional area of ​​the transition hole 123 at one end near the disassembly hole 122.

[0047] Based on the above configuration, a flared structure can be formed at one end of the groove 1211 near the recessed groove 121 of the disassembly hole 122, which facilitates the installation of disassembly tools in conjunction with the disassembly hole 122.

[0048] Continue to refer to Figure 2 In some embodiments, the outer peripheral wall of the first end 11 is provided with an annular groove 111 and an annular protrusion 112. The annular groove 111 and the annular protrusion 112 extend circumferentially along the plunger 10, and the annular protrusion 112 is located on the side of the annular groove 111 near the end face of the first end 11.

[0049] refer to Figure 2 In some embodiments, the plunger may also be provided with a weight reduction hole 13, which extends a certain distance from the end face of the first end 11 along the axial direction of the plunger 10, so as to reduce the weight of the plunger 10.

[0050] Based on the above configuration, the annular groove 111 and the annular protrusion 112 can be respectively connected to the power end for transmission, so as to ensure the reliability and stability of the connection between the plunger 10 and the power end.

[0051] Optionally, the power end may include a clamp that can be engaged in the annular groove 111, and the side of the clamp can abut against the annular protrusion 112. Thus, the annular protrusion 112 can limit the clamp to prevent it from dislodging from the annular groove 111, thereby ensuring the reliability of the connection between the power end and the plunger 10.

[0052] Based on the aforementioned plunger 10, this application also discloses a hydraulic end, which includes a valve box 20, a suction valve guide seat 30, and a plunger 10. The valve box 20 may have a communicating valve chamber 21 and a plunger 10 channel. The suction valve guide seat 30 is located within the valve chamber 21 near the plunger channel 22. The plunger 10 is movably located within the plunger channel 22 and can be moved into the valve box 21. Thus, when the plunger 10 reaches the front dead center position, the second end 12 of the plunger 10 moves towards the valve chamber 21, allowing at least a portion of the suction valve guide seat 30 to be located in the recessed groove 121. This ensures that the second end 12 of the plunger 10 will not collide with the suction valve guide seat 30, guaranteeing that the plunger 10 can reciprocate normally. It should be noted that the front dead center position can be understood as the position where the plunger 10 moves to the deepest point within the valve box 21; that is, at the next moment after reaching the front dead center position, the plunger 10 moves in the opposite direction.

[0053] refer to Figure 3 In some embodiments, the hydraulic end may also include a suction valve assembly 40, which is movably disposed within the valve chamber 21. Thus, during the reciprocating movement of the plunger 10, the suction valve assembly 40 can be periodically opened or closed to facilitate pressurization or release of the fluid.

[0054] It should be noted that when the plunger 10 moves to the front dead center position, the second end 12 of the plunger 10 is located close to the suction valve assembly 40. In this case, at least a portion of the suction valve assembly 40 can be accommodated in the suction valve guide seat 30, and at least a portion of the suction valve assembly 40 is located in the recessed groove 121. In this way, the second end 12 of the plunger 10 can be effectively prevented from contacting the suction valve assembly 40, ensuring that the plunger 10 can reciprocate normally.

[0055] In summary, by providing a recessed groove 121 at the second end 12 of the plunger 10, this embodiment of the application provides sufficient space to accommodate the partial structure, thereby effectively shortening the overall width of the hydraulic end. This not only alleviates the problem of the vehicle being too wide when the hydraulic end is installed on the equipment, but also reduces the amount of blank material used in the valve box 20 of the hydraulic end, which can reduce the overall cost of the hydraulic end to a certain extent.

[0056] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A plunger, applied to a hydraulic end, characterized in that, The plunger (10) includes a first end (11) and a second end (12) located at both ends along the axial direction of the plunger (10). The first end (11) is used to bear the driving force; The second end (12) is used to be disposed in the valve box (20) of the hydraulic end, and the end face of the second end (12) is provided with a recessed groove (121), which is used to accommodate a part of the structure located in the hydraulic end.

2. The plunger according to claim 1, characterized in that, The cross-sectional area of ​​the recessed groove (121) at the groove opening (1211) is greater than the cross-sectional area of ​​the recessed groove (121) at the groove bottom (1212).

3. The plunger according to claim 1, characterized in that, Along the axial direction of the plunger (10), the cross-sectional area of ​​the recessed groove (121) remains unchanged.

4. The plunger according to claim 1, characterized in that, The cross-sectional area of ​​the recessed groove (121) at the groove opening (1211) is smaller than the cross-sectional area of ​​the recessed groove (121) at the groove bottom (1212).

5. The plunger according to any one of claims 1 to 4, characterized in that, The bottom (1212) of the recessed groove (121) is provided with a disassembly hole (122), which extends along the axial direction of the plunger (10).

6. The plunger according to claim 5, characterized in that, The disassembly hole (122) is a threaded hole or a stepped hole.

7. The plunger according to claim 5, characterized in that, The disassembly hole (122) has a transition hole (123) at one end of the groove bottom (1212) near the recessed groove (121). The cross-sectional area of ​​the transition hole (123) at the end near the bottom of the groove (1212) is greater than the cross-sectional area of ​​the transition hole (123) at the end near the disassembly hole (122).

8. The plunger according to any one of claims 1 to 4, characterized in that, The outer peripheral wall of the first end (11) is provided with an annular groove (111) and an annular protrusion (112) extending circumferentially along the plunger (10). The annular protrusion (112) is located on one side of the end face of the annular groove (111) near the first end (11).

9. A hydraulic end, characterized in that, include: Valve box (20), suction valve guide seat (30) and plunger (10) as described in any one of claims 1 to 8; The valve box (20) is provided with a valve chamber (21) and a plunger channel (22) that are connected. The suction valve guide seat (30) is located in the valve chamber (21) near the plunger channel (22). The plunger (10) is movably located in the plunger channel (22) and can be moved into the valve chamber (21). With the plunger (10) in the forward dead position, at least a portion of the suction valve guide seat (30) is located in the recessed groove (121).

10. The hydraulic end according to claim 9, characterized in that, The hydraulic end also includes a suction valve assembly (40), which is movably disposed within the valve chamber (21); With the plunger (10) in the forward dead position, at least a portion of the suction valve assembly (40) is received within the suction valve guide seat (30), and at least a portion of the suction valve assembly (40) is located in the recess (121).

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