Fluid end assembly and pump

Abstract

The invention discloses a fluid end assembly and a pump, and relates to the fields of oil gas, mines and the like. A fluid end assembly includes: a plurality of fluid end modules disposed side by side in a first direction; each fluid end module comprises a fluid end shell, a plunger, a valve seat and a valve assembly. The fluid end shell comprises a valve box and a packing box, the packing box is detachably arranged on the valve box, the valve box is provided with a main channel, and the packing box is provided with a plunger channel communicated with the main channel; the plunger is movably arranged in the plunger channel and can move in or out of the main channel; the main channel is used for containing the valve seat and the valve assembly. The problems that the whole valve box is difficult to maintain, and the whole replacement cost is high can be solved.

Description

Technical Field

[0001] The present application belongs to the technical field of fracturing equipment, and specifically relates to a hydraulic end assembly and a pump. Background Art

[0002] Some hydraulic ends in the related art use an integral valve box, which is provided with a plurality of valve cavities arranged side by side, and a plurality of packing boxes are provided on the side of the valve box, and the plurality of packing boxes are arranged in a one-to-one correspondence with the plurality of valve cavities.

[0003] As the hydraulic end operates for a long time, the valve cavity will be damaged, requiring the entire valve box to be repaired or replaced, which leads to problems such as difficult repair and high replacement costs. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a hydraulic end assembly and a pump that can solve the problems of difficulty in overall maintenance of the valve box and high overall replacement cost.

[0005] In order to solve the above technical problems, this application is implemented as follows: An embodiment of the present application provides a fluid end assembly, comprising: a plurality of fluid end modules arranged side by side along a first direction; Each of the liquid end modules includes a liquid end housing, a plunger, a valve seat and a valve assembly; The hydraulic end housing includes a valve box and a packing box, wherein the packing box is detachably mounted on the valve box, the valve box is provided with a main channel, and the packing box is provided with a plunger channel communicating with the main channel; The plunger is movably disposed in the plunger channel and can be moved into or out of the main channel; The main channel is used to accommodate the valve seat and the valve assembly.

[0006] An embodiment of the present application also provides a pump comprising the above-mentioned hydraulic end assembly.

[0007] The hydraulic end assembly in the embodiment of the present application includes multiple hydraulic end modules, and the hydraulic end housing of each hydraulic end module may include a valve box and a packing box, and the packing box is detachably connected to the valve box. In this way, after the hydraulic end assembly has been running for a long time, even if the hydraulic end housing of an individual hydraulic end module is eroded or worn, and the packing box is worn, the valve box and packing box in the corresponding hydraulic end housing can be repaired or replaced separately, so there is no need to repair or replace the hydraulic end housing as a whole, or even the entire hydraulic end assembly, thereby reducing the difficulty of repair or replacement and reducing the cost of repair or replacement. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 This is a first structural schematic diagram of the hydraulic end module disclosed in an embodiment of the present application; Figure 2This is a second structural schematic diagram of the hydraulic end module disclosed in an embodiment of the present application; Figure 3 A cross-sectional schematic diagram of the hydraulic end module (in a draining state) disclosed in an embodiment of the present application; Figure 4 This is a cross-sectional schematic diagram of the hydraulic end module (in the liquid absorbing state) disclosed in an embodiment of the present application; Figure 5 This is a schematic structural diagram of the fluid end housing disclosed in an embodiment of the present application; Figure 6 This is a cross-sectional schematic diagram of the first form of the fluid end housing disclosed in the embodiment of the present application; Figure 7 This is a cross-sectional schematic diagram of the second form of the fluid end housing disclosed in the embodiment of this application; Figure 8 This is a schematic structural diagram of the plunger pump disclosed in an embodiment of the present application.

[0008] Description of reference numerals: 10-Hydraulic end module; 11-Hydraulic end housing; 111-Valve box; 1111-Main channel; 1112-Threaded hole; 1113-First annular sealing surface; 1114-Sunk groove; 112-Packing box; 1121-Packing box body; 11211-Plunger channel; 11212-Second annular sealing surface; 11213-Lubricating oil hole; 1122-Packing assembly; 1123-Packing cap; 12- plunger; 13-valve seat; 14- Fasteners; 15-sealing sleeve; 151-annular protrusion; 161-first sealing ring; 162-second sealing ring; 163-third sealing ring; 171-discharge gland; 172-discharge cap; 20-connecting plate; 30-Power end assembly. DETAILED DESCRIPTION

[0009] 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.

[0010] 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.

[0011] The embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0012] refer to Figures 1 to 8 The embodiment of the present application discloses a hydraulic end assembly, which includes a plurality of hydraulic end modules 10, and the plurality of hydraulic end modules 10 are arranged side by side along a first direction.

[0013] Each hydraulic end module 10 includes a hydraulic end housing 11, a plunger 12, a valve seat 13, and a valve assembly. The hydraulic end housing 11 is a basic component that provides an installation base for the plunger 12, valve seat 13, and valve assembly. The plunger 12 is a component used to pressurize the fracturing fluid. The valve seat 13 can limit the valve assembly. In this way, the reciprocating movement of the plunger 12 can cause the valve assembly to open or close periodically, so that the fracturing fluid can be sucked into the hydraulic end housing 11, pressurized within the hydraulic end housing 11, and finally discharged. The valve assembly can be an intake valve assembly or a discharge valve assembly.

[0014] The hydraulic end housing 11 includes a valve box 111 and a packing box 112 . The packing box 112 is detachably mounted on the valve box 111 to facilitate assembly and disassembly of the packing box 112 and the valve box 111 , thereby facilitating maintenance or replacement of the valve box 111 or the packing box 112 .

[0015] The valve box 111 may be provided with a main channel 1111, and the packing box 112 may be provided with a plunger channel 11211, which is in communication with the main channel 1111. The plunger 12 is movably disposed in the plunger channel 11211 and can be moved into or out of the main channel 1111. In this manner, the packing box 112 can support and seal the plunger 12, preventing the fracturing fluid from leaking from around the plunger 12. Furthermore, as the plunger 12 moves, the front end of the plunger 12 can reciprocate in or out of the main channel 1111, allowing the fracturing fluid to be drawn into and pressurized within the main channel 1111. Furthermore, the main channel 1111 may be used to accommodate components such as the valve seat 13 and the valve assembly.

[0016] Based on the above-mentioned arrangement, the hydraulic end assembly in the embodiment of the present application includes a plurality of hydraulic end modules 10, and the hydraulic end housing 11 of each hydraulic end module 10 may include a valve box 111 and a packing box 112, and the packing box 112 is detachably connected to the valve box 111. In this way, after the hydraulic end assembly has been running for a long time, even if the hydraulic end housing 11 of an individual hydraulic end module 10 is eroded or worn, and the packing box 112 is worn, etc., the valve box 111 and the packing box 112 in the corresponding hydraulic end housing 11 may be repaired or replaced separately, thereby eliminating the need to repair or replace the hydraulic end housing 11 as a whole, or even the entire hydraulic end assembly, thereby reducing the difficulty of repair or replacement and reducing the cost of repair or replacement. In some embodiments, a threaded hole 1112 may be provided on one side of the valve box 111, and the threaded hole 1112 is coaxially arranged with the main channel 1111. Alternatively, a protrusion may be provided on one side of the valve box 111, and the protrusion may be provided with the threaded hole 1112; or the threaded hole 1112 may be directly provided on the side wall of the valve box 111.

[0017] Correspondingly, one end of the packing box 112 may be provided with an external thread, and threadedly connected to the threaded hole 1112 via the external thread.

[0018] Based on the above arrangement, the packing box 112 can be stably mounted to the side of the valve box 111 , and the packing box 112 can be easily assembled and disassembled.

[0019] Optionally, a sealing ring may be provided at the connection between the packing box 112 and the valve box 111 to further improve the sealing performance of the connection between the packing box 112 and the valve box 111 to prevent leakage of the fracturing fluid.

[0020] In other embodiments, the fluid end module 10 may further include a plurality of fasteners 14, which are distributed along the circumference of the packing box 112 and the outer periphery of the plunger passage 11211, and fasten the packing box 112 to one side of the valve box 111. Based on this, the packing box 112 can be firmly mounted to the valve box 111, and the assembly and disassembly of the packing box 112 can be facilitated.

[0021] Optionally, the packing box 112 may be provided with a plurality of first fastening holes, which are arranged along the periphery of the plunger channel 11211; accordingly, the sidewall of the valve box 111 may be provided with a plurality of second fastening holes, which are arranged along the periphery of the main channel 1111. Based on this, after the packing box 112 and the valve box 111 are docked, the plurality of first fastening holes are aligned with the plurality of second fastening holes, and then fasteners 14 are installed in each group of aligned first fastening holes and second fastening holes to facilitate the fastening connection between the packing box 112 and the valve box 111. For example, the first fastening holes may be smooth holes, and the second fastening holes may be threaded holes 1112.

[0022] In some embodiments, the hydraulic end module 10 may further include a sealing sleeve 15 for sealing the periphery of the plunger 12, wherein the sealing sleeve 15 can be sleeved on the outside of the plunger 12, and the inner wall of the sealing sleeve 15 can fit tightly with the outer wall of the plunger 12, and the plunger 12 can move back and forth in the sealing sleeve 15.

[0023] To facilitate installation of the sealing sleeve 15, a first annular sealing surface 1113 may be provided at one end of the main channel 1111 near the packing box 112. One end of the sealing sleeve 15 is sealingly connected between the plunger 12 and the first annular sealing surface 1113. Thus, the plunger 12 and the valve box 111 can be sealed by one end of the sealing sleeve 15 to prevent leakage of the fracturing fluid.

[0024] Optionally, the first annular sealing surface 1113 may be a cylindrical surface or a conical surface, such as a cylindrical surface or a conical surface.

[0025] Accordingly, one end of the plunger channel 11211 in the approach direction may be provided with a second annular sealing surface 11212, and the other end of the sealing sleeve 15 is sealingly connected between the plunger 12 and the second annular sealing surface 11212. Based on this, the other end of the sealing sleeve 15 can be used to seal the plunger 12 and the packing box 112 to prevent leakage of the fracturing fluid.

[0026] Optionally, the second annular sealing surface 11212 may be a cylindrical surface or a conical surface, such as a cylindrical surface or a conical surface.

[0027] In some more specific embodiments, the two ends of the sealing sleeve 15 can be sealed with the first annular sealing surface 1113 and the second annular sealing surface 11212 respectively, so that it can play a sealing role between the plunger 12 and the valve box 111, and between the plunger 12 and the packing box 112.

[0028] Furthermore, a sink groove 1114 may be provided on one side of the valve box 111, and the first annular sealing surface 1113 and the main channel 1111 are respectively arranged at the bottom of the sink groove 1114; or, a sink groove 1114 may be provided on one side of the packing box 112, and the second annular sealing surface 11212 and the plunger channel 11211 are respectively arranged at the bottom of the sink groove 114; or, a sink groove 1114 may be provided on one side of the valve box 111 and one side of the packing box 112, and the sink grooves 1114 of the two are arranged opposite to each other.

[0029] Accordingly, the outer wall of the sealing sleeve 15 may be provided with an annular protrusion 151, which is embedded in the recessed groove 1114. Based on this, the cooperation between the annular protrusion 151 and the recessed groove 1114 can achieve axial and radial positioning of the sealing sleeve 15, thereby improving the installation stability of the sealing sleeve 15.

[0030] In some embodiments, each valve box 111 can be provided with a plurality of main channels 1111 arranged side by side along a first direction, and a plurality of sets of plungers 12, valve bodies and valve seats 13 can be installed through the plurality of main channels 1111, so that a plurality of groups of fracturing operations can be performed through each hydraulic end module 10, thereby improving the fracturing efficiency.

[0031] Accordingly, the fluid end housing 11 may include multiple packing boxes 112, each of which is detachably mounted on the valve housing 111. The plunger channels 11211 of the multiple packing boxes 112 are in one-to-one communication with the multiple main channels 1111. Thus, the multiple packing boxes 112 can be used to seal the support of the multiple plungers 12, thereby preventing fracturing fluid from leaking around each plunger 12.

[0032] In some embodiments, the fluid end module 10 may further include a first sealing ring 161 and a second sealing ring 162. The first sealing ring 161 and the second sealing ring 162 may be respectively sealed between the valve seat 13 and the inner wall of the main channel 1111, and along the axial direction of the fluid end module 10, the first sealing ring 161 and the second sealing ring 162 are respectively located on both sides of the liquid inlet channel of the valve box 111.

[0033] Based on the above arrangement, the first sealing ring 161 and the second sealing ring 162 can not only seal the valve seat 13 and the inner wall of the main channel 1111 to prevent the fracturing liquid from entering between the valve seat 13 and the inner wall of the main channel 1111, but also seal both sides of the liquid inlet channel to avoid leakage of the fracturing liquid.

[0034] In some embodiments, the hydraulic end module 10 may further include a discharge gland 171 and a discharge cap 172, wherein the discharge gland 171 blocks the end of the main channel 1111 away from the packing box 112, and the discharge cap 172 is detachably mounted on the main channel 1111 and compresses the discharge gland 171. Thus, the main channel 1111 can be sealed by the discharge cap 172, and the discharge gland 171 can compress the discharge cap 172 to ensure the stability of the discharge gland 171 when under pressure. In addition, the discharge gland 171 can be easily disassembled and assembled, thereby facilitating maintenance of the interior of the valve box 111.

[0035] Furthermore, the hydraulic end module 10 may include a second sealing ring 162 and a third sealing ring 163, wherein the second sealing ring 162 is sealed between the valve seat 13 and the inner wall of the main channel 1111, and the third sealing ring 163 is sealed between the discharge pressure cover 171 and the inner wall of the main channel 1111, and the second sealing ring 162 and the third sealing ring 163 are respectively located on both sides of the liquid storage channel of the valve box 111.

[0036] Based on the above arrangement, the second sealing ring 162 can be used to seal between the valve seat 13 and the inner wall of the main channel 1111 to prevent the fracturing liquid from entering between the valve seat 13 and the inner wall of the main channel 1111. The third sealing ring 163 can be used to seal between the discharge pressure cover 171 and the inner wall of the main channel 1111 to prevent the fracturing liquid from entering between the discharge pressure cover 171 and the inner wall of the main channel 1111. In addition, the second sealing ring 162 and the third sealing ring 163 can also be used to seal on both sides of the liquid outlet channel to prevent the fracturing liquid from leaking.

[0037] In some embodiments, the packing box 112 may include a packing box body 1121, a packing assembly 1122, and a packing cap 1123. The packing box body 1121 is provided with a plunger channel 11211, and the packing assembly 1122 is sealingly connected between the inner wall of the plunger channel 11211 and the outer wall of the plunger 12. Thus, the packing assembly 1122 can seal the gap between the plunger 12 and the packing box body 1121 to prevent leakage of the fracturing fluid.

[0038] Optionally, the packing box body 1121 may be an integrated structure or a split structure.

[0039] The packing assembly 1122 may include packing, spacer rings, pressure rings, oil rings, etc. Of course, it may also be in other forms, which are not specifically limited here.

[0040] The packing pressure cap 1123 is sleeved on the outside of the plunger 12 and is threadedly connected to the packing box body 1121, and the end of the packing pressure cap 1123 presses the packing assembly 1122. In this way, the packing pressure cap 1123 can limit the packing assembly 1122 to prevent the packing assembly 1122 from moving at will under the drive of the plunger 12; and it can also facilitate the replacement of the packing assembly 1122.

[0041] In some embodiments, the side wall of the packing box body 1121 may be provided with a lubricating oil hole 11213, which extends from the outer circumference of the packing box body toward the plunger channel 11211 and is connected to the plunger channel 11211, and the lubricating oil hole 11213 is provided corresponding to the packing assembly 1122.

[0042] Based on the above arrangement, lubricating oil or grease can be injected into the packing assembly 1122 in the plunger channel 11211 through the lubricating oil hole 11213, thereby achieving lubrication between the packing assembly 1122 and the plunger 12, ensuring good lubrication effect between the plunger 12 and the packing assembly 1122.

[0043] Based on the above-mentioned fluid end assembly, an embodiment of the present application further discloses a pump, and the disclosed pump includes the above-mentioned fluid end assembly.

[0044] Optionally, the pump may further include a power end assembly 30 , wherein a power output end of the power end assembly 30 is in transmission connection with the plunger 12 to drive the plunger 12 to move back and forth.

[0045] In addition, the pump may further include a connecting plate 20 , which is fixed to the power end assembly 30 , and the plurality of fluid end modules 10 are fastened to the connecting plate 20 respectively to ensure the installation stability of each fluid end module 10 .

[0046] 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 hydraulic end assembly, characterized in that: include: A plurality of hydraulic end modules (10) arranged side by side along a first direction; Each of the hydraulic end modules (10) comprises a hydraulic end housing (11), a plunger (12), a valve seat (13) and a valve assembly; The hydraulic end housing (11) comprises a valve box (111) and a packing box (112), wherein the packing box (112) is detachably arranged on the valve box (111), the valve box (111) is provided with a main channel (1111), and the packing box (112) is provided with a plunger channel (11211) communicating with the main channel (1111); The plunger (12) is movably disposed in the plunger channel (11211) and can be moved into or out of the main channel (1111); The main channel (1111) is used to accommodate the valve seat (13) and the valve assembly.

2. The hydraulic end assembly according to claim 1, characterized in that: A threaded hole (1112) is provided on one side of the valve box (111), and the threaded hole (1112) is coaxially arranged with the main channel (1111); One end of the packing box (112) is threadedly connected to the threaded hole (1112).

3. The hydraulic end assembly according to claim 1, characterized in that: The hydraulic end module (10) further comprises a plurality of fasteners (14), wherein the plurality of fasteners (14) are distributed on the periphery of the plunger channel (11211) along the circumference of the packing box (112) and fasten the packing box (112) to one side of the valve box (111).

4. The hydraulic end assembly according to claim 2 or 3, characterized in that: The hydraulic end module (10) further includes a sealing sleeve (15); An end of the main channel (1111) close to the packing box (112) is provided with a first annular sealing surface (1113), and one end of the sealing sleeve (15) is sealed between the plunger (12) and the first annular sealing surface (1113); and / or, A second annular sealing surface (11212) is provided at one end of the plunger channel (11211) close to the valve box (111), and the other end of the sealing sleeve (15) is sealed between the plunger (12) and the second annular sealing surface (11212).

5. The hydraulic end assembly according to claim 4, characterized in that: A sink groove (1114) is provided on one side of the valve box (111), and the first annular sealing surface (1113) and the main channel (1111) are respectively provided at the bottom of the sink groove (1114); and / or a sink groove (1114) is provided on one side of the packing box (112), and the second annular sealing surface (11212) and the plunger channel (11211) are respectively provided at the bottom of the sink groove (1114); An annular protrusion (151) is provided on the outer wall of the sealing sleeve (15), and the annular protrusion (151) is embedded in the sink groove (1114).

6. The fluid end assembly according to any one of claims 1 to 3, characterized in that: Each valve box (111) is provided with a plurality of main channels (1111) arranged side by side along the first direction; The hydraulic end housing (11) comprises a plurality of packing boxes (112), the plurality of packing boxes (112) being detachably arranged on the valve box (111), and the plunger channels (11211) of the plurality of packing boxes (112) being in one-to-one communication with the plurality of main channels (1111).

7. The hydraulic end assembly according to claim 1, characterized in that: The hydraulic end module (10) further includes a first sealing ring (161) and a second sealing ring (162); The first sealing ring (161) and the second sealing ring (162) are respectively sealed and connected between the valve seat (13) and the inner wall of the main channel (1111), and along the axial direction of the hydraulic end module (10), the first sealing ring (161) and the second sealing ring (162) are respectively located on both sides of the liquid inlet channel of the valve box (111).

8. The hydraulic end assembly according to claim 1, characterized in that: The hydraulic end module (10) further comprises a discharge gland (171) and a discharge cap (172), wherein the discharge gland (171) blocks an end of the main channel (1111) away from the packing box (112), and the discharge cap (172) is detachably disposed on the main channel (1111) and presses the discharge gland (171). The hydraulic end module (10) includes a second sealing ring (162) and a third sealing ring (163), wherein the second sealing ring (162) is sealed between the valve seat (13) and the inner wall of the main channel (1111), and the third sealing ring (163) is sealed between the discharge gland (171) and the inner wall of the main channel (1111), and the second sealing ring (162) and the third sealing ring (163) are respectively located on both sides of the liquid outlet channel of the valve box (111).

9. The hydraulic end assembly according to claim 1, characterized in that: The packing box (112) comprises a packing box body (1121), a packing assembly (1122) and a packing pressure cap (1123); The packing box body (1121) is provided with the plunger channel (11211), and the packing assembly (1122) is sealed between the inner wall of the plunger channel (11211) and the outer wall of the plunger (12), wherein the packing box body (1121) is an integrated structure or a split structure; The packing pressing cap (1123) is sleeved on the outside of the plunger (12) and is threadedly connected to the packing box body (1121), and the end of the packing pressing cap (1123) presses the packing assembly (1122).

10. The hydraulic end assembly according to claim 9, characterized in that: The side wall of the packing box body (1121) is provided with a lubricating oil hole (11213); The lubricating oil hole (11213) extends from the outer peripheral surface of the packing box body (1121) toward the plunger channel (11211) and is in communication with the plunger channel (11211), and the lubricating oil hole (11213) is arranged corresponding to the packing assembly (1122).

11. A pump, characterized in that: A fluid end assembly comprising any one of claims 1 to 10.

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