Plunger and fluid end

Abstract

The invention 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] The present application belongs to the technical field of oil, gas, mining, etc., and specifically relates to a plunger and a hydraulic end. Background Art

[0002] In related art, a plunger pump may include a valve housing, a valve assembly, a valve seat, a plunger, and other components. The valve housing has a connected cavity and a plunger hole. The valve assembly and valve seat are both located within the cavity, and the plunger slides in the plunger hole. As the plunger reciprocates, liquid enters and exits the valve housing, achieving pressurized processing of the liquid.

[0003] However, since the valve assembly and the valve seat are both located in the cavity, in order to prevent the plunger from being affected by the valve assembly and the valve seat on the reciprocating movement of the plunger, it is necessary to increase the width of the hydraulic end of the plunger pump in the reciprocating movement direction of the plunger, which results in the hydraulic end of the plunger pump being bulky and increasing manufacturing and transportation costs. Summary of the Invention

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

[0005] In order to solve the above technical problems, this application is implemented as follows: An embodiment of the present application provides a plunger, applied to a hydraulic end, the plunger comprising: a first end portion and a second end portion disposed opposite to each other along the axial direction of the plunger; The first end portion is used to bear the driving action; The second end portion is used to be arranged in the valve box of the hydraulic end. The end surface of the second end portion is provided with a recessed groove, and the recessed groove is used to accommodate a part of the structure located at the hydraulic end.

[0006] The embodiment of the present application further provides a hydraulic end, comprising: a valve box, a suction valve guide seat and the above-mentioned plunger; The valve box is provided with a valve cavity and a plunger passage communicating with each other, the suction valve guide seat is provided in an area of the valve cavity close to the plunger passage, and the plunger is movably provided in the plunger passage and can be moved into the valve cavity; When the plunger moves to the front dead center position, at least a portion of the suction valve guide seat is located in the recessed groove.

[0007] The embodiment of the present application optimizes the structure of the plunger, so that a recessed groove is formed on the end surface of the second end of the plunger, and one end of the recessed groove is used to be set in the valve box. In this way, when the plunger moves toward the valve box, part of the structure of the hydraulic end can gradually enter the recessed groove. That is, by setting the recessed groove, a space for the part of the structure to avoid collision between the second end of the plunger and the part of the structure is provided, thereby ensuring the normal reciprocating movement of the plunger. Compared with the method in which the end surface of the second end is flat, it can be beneficial to reduce the width of the valve box and further reduce the volume of the hydraulic end without changing the range of movement of the plunger, thereby making it easier to transport and reducing transportation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic structural diagram of the plunger disclosed in the embodiment of the present application; Figure 2 A schematic cross-sectional view of the plunger disclosed in an embodiment of the present application; Figure 3 This is a partial cross-sectional schematic diagram of the hydraulic end disclosed in the embodiment of the present application.

[0009] Description of reference numerals: 10- plunger; 11-first end; 111-annular groove; 112-annular protrusion; 12-second end; 121-recessed groove; 1211-notch; 1212-bottom of groove; 122-disassembly hole; 123-transition hole; 13-weight reduction hole; 20-valve box; 21-valve chamber; 22-plunger channel; 30-Suction valve guide seat; 40-Inhalation valve assembly. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0011] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0012] The embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0013] refer to Figures 1 to 3 The present application discloses a plunger 10 for use with a hydraulic end. Optionally, the hydraulic end may be a hydraulic end of a pump, such as a hydraulic end of a fracturing pump, or may be a hydraulic end of other devices, which is not specifically limited herein. The hydraulic end may further include a valve box 20 and other structures, and the plunger 10 is movably disposed in a 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.

[0014] The first end portion 11 is used to bear the driving action. Optionally, the first end portion 11 can be used for transmission connection with a power end, and the power end can apply a driving force to the first end portion 11 of the plunger 10 to enable the plunger 10 to reciprocate.

[0015] The second end portion 12 is configured to be disposed in a valve box 20 of the hydraulic end. When the plunger 10 reciprocates, the second end portion 12 can reciprocate in the valve box 20 to pressurize or release the fluid (eg, fracturing fluid).

[0016] The end surface of the second end portion 12 is provided with a recessed groove 121, which is used to accommodate a portion of the hydraulic end structure. Optionally, the hydraulic end portion may include a valve assembly, a valve seat, a suction valve guide seat 30, and other structures, which are not specifically limited here. Furthermore, the portion of the structure may be disposed within the valve housing 20 to facilitate control of the flow of liquid into or out of the valve housing 20.

[0017] Based on the above-mentioned configuration, the embodiment of the present application optimizes the structure of the plunger 10, so that a recessed groove 121 is formed on the end surface of the second end portion 12 of the plunger 10, and one end of the recessed groove 121 is used to be set in the valve box 20. In this way, when the plunger 10 moves toward the valve box 20, the partial structure of the hydraulic end can gradually enter the recessed groove 121. That is, through the provision of the recessed groove 121, an escape space is provided for the partial structure to prevent the second end portion 12 of the plunger 10 from colliding with the partial structure, thereby ensuring the normal reciprocating movement of the plunger 10. Compared with the method in which the end surface of the second end portion 12 is flat, when the moving range of the plunger 10 does not change, it can be beneficial to reduce the width of the valve box 20 and further reduce the volume of the hydraulic end, thereby making it easier to transport and reducing transportation costs.

[0018] refer to Figure 2 In some embodiments, the cross-sectional area of the recessed groove 121 at the notch 1211 is greater than the cross-sectional area of the recessed groove 121 at the groove bottom 1212, that is, the recessed groove 121 forms a flared structure at the notch 1211. In this way, during the reciprocating movement of the plunger 10, part of the structure can enter the recessed groove 121, thereby avoiding part of the structure blocking the movement of the plunger 10 and ensuring the normal reciprocating movement of the plunger 10.

[0019] Optionally, the groove wall of the concave 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.

[0020] In some more specific embodiments, the longitudinal cross-section of the recessed groove 121 is trapezoidal.

[0021] In other embodiments, the cross-sectional area of the recessed groove 121 may remain unchanged along the axial direction of the plunger 10. In this case, the recessed groove 121 may also provide sufficient space for accommodating the partial structure to ensure that the plunger 10 can move back and forth normally.

[0022] Optionally, the groove wall of the concave groove 121 can be a cylindrical surface, such as a cylindrical surface, a prismatic surface, etc. Of course, it can also be other shapes, which are not specifically limited here.

[0023] In some more specific embodiments, the cross-section of the concave groove 121 along the longitudinal direction is rectangular.

[0024] In some other embodiments, the cross-sectional area of the recessed groove 121 at the notch 1211 may be smaller than the cross-sectional area of the recessed groove 121 at the bottom 1212 of the groove, that is, the recessed groove 121 forms a necking structure at the notch 1211. This method can also avoid partial structures blocking the movement of the plunger 10, thereby ensuring the normal reciprocating movement of the plunger 10.

[0025] In some embodiments, the notch 1211 of the recessed groove 121 may be circular, oval, square, rectangular, etc. Of course, it may also be other irregular shapes, which are not specifically limited here.

[0026] In some embodiments, the cross-sectional area of the recessed groove 121 at the notch 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 to prevent the second end 12 from colliding with the partial structure during the reciprocating movement of the plunger 10, thereby ensuring that the plunger 10 can move back and forth normally.

[0027] Continue to refer Figure 2 In some embodiments, the bottom 1212 of the recessed groove 121 may be provided with a disassembly hole 122 extending along the axial direction of the plunger 10. Based on this, the plunger 10 can be disassembled by installing a disassembly tool in the disassembly hole 122.

[0028] Specifically, when the plunger 10 needs to be disassembled, a disassembly tool can be installed in the disassembly hole 122, and then a force is applied to the disassembly tool to drive the plunger 10 to move, thereby achieving disassembly of the plunger 10.

[0029] In some embodiments, the disassembly hole 122 may be a threaded hole, so that a disassembly tool may be screwed into the disassembly hole 122 via threads, so that a disassembly force may be applied to the plunger 10 by the disassembly tool.

[0030] In other embodiments, the disassembly hole 122 can be a stepped hole, so that the disassembly tool can be clamped or hooked in the stepped hole, and then a force is applied to the disassembly tool to drive the plunger 10 to move, thereby realizing the disassembly and assembly of the plunger 10.

[0031] Optionally, the stepped hole can be divided into multiple hole segments, and along the axial direction of the plunger 10, the cross-sectional area of the hole segment close to the second end 12 is larger than the cross-sectional area of the hole segment away from the second end 12. In this way, a step structure can be formed at the connection of the hole segments to facilitate the clamping or hooking of the disassembly and assembly tools.

[0032] 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 larger than the cross-sectional area of the transition hole 123 at one end near the disassembly hole 122.

[0033] Based on the above configuration, a flared structure may be formed at one end of the disassembly hole 122 close to the notch 1211 of the recessed groove 121 , so that the disassembly tool can be easily installed in conjunction with the disassembly hole 122 .

[0034] Continue to refer Figure 2 In some embodiments, the outer peripheral wall of the first end portion 11 is provided with an annular groove 111 and an annular protrusion 112, the annular groove 111 and the annular protrusion 112 respectively extend along the circumference of the plunger 10, and the annular protrusion 112 is located on one side of the annular groove 111 close to the end face of the first end portion 11.

[0035] refer to Figure 2 In some embodiments, the plunger may further be provided with a weight-reducing hole 13 , which extends a certain distance from the end surface of the first end portion 11 along the axial direction of the plunger 10 , so as to reduce the weight of the plunger 10 .

[0036] Based on the above arrangement, the annular groove 111 and the annular protrusion 112 can be respectively connected to the power end in a transmission manner to ensure the reliability and stability of the connection between the plunger 10 and the power end.

[0037] Optionally, the power end may include a clamp, which may be inserted into the annular groove 111, and the side of the clamp may abut against the annular protrusion 112, so that the annular protrusion 112 may limit the clamp to prevent the clamp from being separated from the annular groove 111, thereby ensuring the reliability of the connection between the power end and the plunger 10.

[0038] Based on the above-mentioned plunger 10, the embodiment of the present application further discloses a hydraulic end, which includes a valve housing 20, a suction valve guide seat 30, and a plunger 10. The valve housing 20 may be provided with a valve cavity 21 and a plunger 10 passage communicating with each other. The suction valve guide seat 30 is provided in an area of the valve cavity 21 near the plunger passage 22. The plunger 10 is movably provided in the plunger passage 22 and can be moved into the valve housing 21. Thus, when the plunger 10 moves to the front dead center position, the second end 12 of the plunger 10 moves toward the valve cavity 21, so that at least a portion of the suction valve guide seat 30 can be located in the recessed groove 121. This ensures that the second end 12 of the plunger 10 does not collide with the suction valve guide seat 30, ensuring that the plunger 10 can reciprocate normally. It should be noted that the front dead center position can be understood as the position at which the plunger 10 moves to the deepest point in the valve housing 21, that is, the moment after reaching the front dead center position, the plunger 10 moves in the reverse direction.

[0039] refer to Figure 3 In some embodiments, the hydraulic end may further include a suction valve assembly 40, which is movably disposed in the valve chamber 21. In this way, 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.

[0040] It should be noted here 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 and the suction valve assembly 40 can be effectively avoided, ensuring that the plunger 10 can move back and forth normally.

[0041] In summary, the embodiment of the present application provides sufficient space for accommodating some structures by setting a recessed groove 121 at the second end 12 of the plunger 10, thereby effectively shortening the overall width of the hydraulic end. This not only alleviates the problem of the vehicle being too wide due to the hydraulic end being installed on the equipment, but also reduces the amount of blanks used in the valve box 20 of the hydraulic end, and to a certain extent reduces the overall cost of the hydraulic end.

[0042] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

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

2. The plunger according to claim 1, wherein 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, wherein Along the axial direction of the plunger (10), the transverse area of the recessed groove (121) remains unchanged.

4. The plunger according to claim 1, wherein 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 A disassembly hole (122) is provided at the bottom (1212) of the recessed groove (121), and the disassembly hole (122) extends along the axial direction of the plunger (10).

6. The plunger according to claim 5, wherein: The disassembly hole (122) is a threaded hole or a stepped hole.

7. The plunger according to claim 5, wherein: The disassembly hole (122) is provided with a transition hole (123) at one end close to the bottom (1212) of the recessed groove (121); The cross-sectional area of the transition hole (123) at one end close to the groove bottom (1212) is larger than the cross-sectional area of the transition hole (123) at one end close to 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 portion (11) is provided with an annular groove (111) and an annular protrusion (112) extending along the circumference of the plunger (10); The annular protrusion (112) is located on one side of the end surface of the annular groove (111) close to the first end portion (11).

9. A hydraulic end, characterized in that: include: A valve box (20), a suction valve guide seat (30), and a plunger (10) according to any one of claims 1 to 8; The valve box (20) is provided with a valve cavity (21) and a plunger passage (22) that are connected to each other. The suction valve guide seat (30) is provided in an area of the valve cavity (21) close to the plunger passage (22). The plunger (10) is movably provided in the plunger passage (22) and can be moved into the valve cavity (21). When the plunger (10) moves to the front dead center position, at least a portion of the suction valve guide seat (30) is located in the recessed groove (121).

10. The fluid end according to claim 9, characterized in that: The hydraulic end further comprises a suction valve assembly (40), and the suction valve assembly (40) is movably disposed in the valve cavity (21); When the plunger (10) moves to the front dead center position, at least a portion of the suction valve assembly (40) is 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).

Images