Fracturing pump power end and pull rod mechanism thereof

Abstract

The invention discloses a fracturing pump power end and a pull rod mechanism thereof. The pull rod mechanism of the fracturing pump power end comprises a pull rod, a pull rod fixing seat and a pump shell. The pump shell comprises a front plate and a vertical plate which are connected. The vertical plate is provided with a mounting hole for the pull rod fixing seat to penetrate through, and the pull rod fixing seat is assembled in the mounting hole; a connecting hole for connecting a pull rod is formed in the pull rod fixing seat; the front plate is provided with a pull rod through hole for the pull rod to pass through; the pull rod penetrates through the pull rod through hole in the front plate and is connected with the connecting hole in the pull rod fixing base. By additionally arranging the pull rod fixing base, the traditional problems that threads of a front plate of the power end pump shell are prone to losing efficacy and welding seams of the front plate are prone to cracking are solved, the peripheral welding seam structure of the front plate of the pump shell is simplified, deformation of the pump shell is reduced, and therefore the service life strength of the pull rod and the pump shell is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fracturing pumps, and particularly relates to a fracturing pump power end and a pull rod mechanism thereof. BACKGROUND

[0002] The fracturing pump is a main output device for oil and gas fracturing operation. With the increasing requirements of pressure and displacement for the fracturing operation, the working load of the fracturing pump is getting higher and higher.

[0003] The prior art has the following defects: the pull rod and the pump shell of the current fracturing pump are relatively weak, and the pull rod fracture and the pump shell weld cracking occur from time to time, which has many limitations on the working load, equipment life and the like of the fracturing operation, and reduces the safety and production efficiency of the fracturing operation. SUMMARY

[0004] In view of at least one of the above technical problems, the application provides a fracturing pump power end and a pull rod mechanism thereof, which changes the structural mode of pull rod connection by increasing the pull rod fixing seat, improves the pull rod connection strength, and greatly reduces the stress on the pump shell weld.

[0005] Technical scheme: To solve the above technical problems, the application adopts the technical scheme that: In a first aspect, the application provides a fracturing pump power end pull rod mechanism, which comprises a pull rod, a pull rod fixing seat and a pump shell; the pump shell comprises a front plate and a vertical plate connected with each other; The vertical plate is provided with a mounting hole for penetrating the pull rod fixing seat, and the pull rod fixing seat is assembled in the mounting hole; The pull rod fixing seat is provided with a connecting hole for connecting the pull rod; The front plate is provided with a pull rod through hole for the pull rod to pass through; The pull rod passes through the pull rod through hole on the front plate and is connected with the connecting hole on the pull rod fixing seat.

[0006] In some embodiments, the pump shell further comprises an upper sealing plate, a lower sealing plate and a steel sleeve; the upper surface of the front plate is welded with the upper sealing plate, the lower surface of the front plate is welded with the lower sealing plate, the rear surface of the front plate is welded with the vertical plate, the steel sleeve hole in the middle of the front plate is welded with the steel sleeve, and a main body frame is formed.

[0007] Further, in some embodiments, the vertical plate is vertically welded on the rear surface of the front plate, the upper sealing plate is welded on the upper side of the front plate and the vertical plate, and the lower sealing plate is welded on the lower side of the front plate and the vertical plate, for supporting and strengthening the vertical plate.

[0008] In some embodiments, the connecting hole is a threaded through hole for threadedly connecting the pull rod.

[0009] Further, in some embodiments, the pull rod fixing seat is a symmetrical structure and is provided with two connecting holes symmetrically.

[0010] Further, the pull rod fixing seat is symmetrically assembled relative to the stand plate, one connecting hole is connected with a pull rod at the first side of the stand plate, and the other connecting hole is connected with another pull rod at the second side of the stand plate.

[0011] In some embodiments, a steel sleeve avoiding groove is arranged at one end of the stand plate facing the front plate.

[0012] In some embodiments, the mounting hole is a square through hole matched with the pull rod fixing seat.

[0013] In some embodiments, the pull rod fixing seat is made of alloy steel, and the yield strength of the pull rod fixing seat is greater than 600 MPa.

[0014] In a second aspect, the application provides a fracturing pump power end, comprising the pull rod mechanism of the fracturing pump power end in the first aspect.

[0015] Beneficial effects: the fracturing pump power end and the pull rod mechanism thereof provided by the application have the following advantages: the structure mode of the pull rod connection is changed by increasing the pull rod fixing seat, the pull rod connection strength is improved, and the stress on the pump shell weld is greatly reduced, so that the service life and strength of the pull rod and the pump shell are improved, and the reliability of the fracturing pump and the production efficiency of the fracturing operation are improved.

[0016] Further, the structure of the pull rod fixing seat assembled with the stand plate and the pull rod makes the pull rod force directly act on the stand plate, which reduces the stress on the pump shell weld compared with the traditional structure in which the pull rod force directly acts on the front plate, and reduces the pump shell welding requirements and cracking risk. In the application, the pull rod fixing seat is threadedly connected with the pull rod, the pull rod fixing seat is made of high-strength alloy steel, the strength is improved, there is no tripping risk, and compared with the traditional structure in which the pull rod is threadedly connected with the front plate of the pump shell, the material strength of the front plate of the pump shell is low, and the thread failure risk is large. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 4 is a side view of the pull rod mechanism of the fracturing pump power end of the embodiment; Figure 2 FIG. 5 is a rear view of the pull rod mechanism of the fracturing pump power end of the embodiment; Figure 3 FIG. 6 is a top view of the pull rod mechanism of the fracturing pump power end of the embodiment; Figure 4 FIG. 7 is a front view of the front plate of the embodiment; Figure 5 FIG. 8 is a front view of the stand plate of the embodiment; Figure 6 FIG. 9 is a front view of the pull rod fixing seat of the embodiment; and In the figure: 1, upper end plate, 2, front plate, 3, lower end plate, 4, steel sleeve, 5, vertical plate, 6, pull rod, 7, pull rod fixing seat, 2001, first weld, 2002, second weld, 2003, third weld, 2004, fourth weld; 201, pull rod through hole, 202, steel sleeve hole, 501, mounting hole, 502, steel sleeve avoiding groove, 701, connecting hole. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0019] Unless otherwise specifically indicated, the relative arrangements of parts and steps, numerical expressions, and numerical values set forth in the various examples disclosed herein are not limiting but merely exemplary. It is to be understood that the above description is intended to be illustrative and not restrictive. Techniques, methods, and devices known to those of ordinary skill in the art can be used without departing from the scope of the present application. In this context, all examples and conditional language are intended to encompass both the particular examples and conditional recitations as well as other examples and conditions for which the particular examples and conditional recitations serve as a prototype. All such additional examples and conditions are contemplated as being within the scope of the present application. Any examples described herein are intended to be illustrative and not restrictive. Numerous other examples can be contemplated without departing from the scope of the present application. It is to be understood that the various embodiments shown and discussed herein are simply exemplary and that a myriad of other embodiments can be constructed without departing from the scope of the present application. Accordingly, the scope of the present application is not intended to be limited to the examples described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0020] Furthermore, the terms "first", "second", and the like, do not denote any quantity or order but are used as labels, i.e. terms of distinction. Therefore, these terms are used interchangeably and are merely intended to distinguish a different structure or a different element of the application from another. It is to be understood that the terms "comprising", "including", "having" and / or "containing" are used herein to mean including but not limited to, and are open-ended linking devices.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0022] Example 1: Figures 1 to 4 As shown, this embodiment provides a pull rod mechanism at the power end of a fracturing pump, comprising a pull rod 6, a pull rod fixing seat 7 and a pump housing; the pump housing comprises a front plate 2 and a vertical plate 5 connected thereto; The vertical plate 5 is provided with a mounting hole 501 for passing the tie rod fixing seat 7, and the tie rod fixing seat 7 is assembled in the mounting hole 501; the tie rod fixing seat 7 is provided with a connecting hole 701 for connecting the tie rod 6; The front plate 2 is provided with a pull rod through hole 201 for the pull rod 6 to pass through; The pull rod 6 passes through the pull rod through hole 201 on the front plate 2 and is connected to the connection hole 701 on the pull rod fixing seat 7 .

[0023] More specifically, Figure 1 、 Figure 2 As shown, the pump casing comprises a front plate 2, a vertical plate 5, an upper sealing plate 1, a lower sealing plate 3, and a steel jacket 4. The upper surface of the front plate 2 is welded to the upper sealing plate 1, the lower surface of the front plate 2 is welded to the lower sealing plate 3, and the rear surface of the front plate 2 is welded to the vertical plate 5. A steel jacket hole 202 is opened in the center of the front plate 2 and welded to the steel jacket 4, forming the main frame for supporting and reinforcing the vertical plate. The front plate 2 is welded to the vertical plate 5, the upper sealing plate 1, the steel jacket 4, and the lower sealing plate 3, respectively, forming a first weld 2001, a second weld 2002, a third weld 2003, and a fourth weld 2004.

[0024] Furthermore, in this embodiment, the vertical plate 5 is vertically welded to the rear plane of the front plate 2, the upper sealing plate 1 is welded to the upper side of the front plate 2 and the vertical plate 5, and the lower sealing plate 3 is welded to the lower side of the front plate 2 and the vertical plate 5.

[0025] like Figure 4 As shown, the pull rod through hole 201 of the front plate 2 is changed from a threaded hole of a traditional structure to a through hole, and the pull rod 6 directly passes through the front plate 2 and is no longer directly connected thereto, and its strength requirement is greatly reduced.

[0026] The pull rod 6 passes through the pull rod through hole 201 on the front plate 2, the front plate 2 no longer bears the pull rod force, and therefore the first weld 2001, the second weld 2002, the third weld 2003 and the fourth weld 2004 no longer bear the pull rod tension, the pull rod force is borne by the vertical plate 5, and the second weld 2002, the third weld 2003 and the fourth weld 2004 only bear the stress caused by the deformation of the vertical plate 5.

[0027] As shown in the drawings, Figure 6 In this embodiment, the pull rod fixing seat 7 is a symmetrical structure, and two connecting holes 701 are symmetrically arranged. In some embodiments, the connecting hole 701 is a threaded hole. In this embodiment, the pull rod fixing seat 7 is symmetrically provided with two threaded holes, which are respectively connected with the two pull rods 6.

[0028] Further, as shown in the drawings, Figure 3 The pull rod fixing seat 7 is symmetrically assembled relative to the vertical plate, one connecting hole 701 is connected with one pull rod 6 on the first side of the vertical plate, and the other connecting hole 701 is connected with the other pull rod 6 on the second side of the vertical plate.

[0029] In this embodiment, the pull rod fixing seat 7 is made of high-strength alloy steel, and the yield strength of the pull rod fixing seat 7 is greater than 600 MPa. The problem of weak thread strength of the traditional structure (only 355 MPa) is avoided.

[0030] As shown in the drawings, Figure 1 , Figure 2 , Figure 5 The end of the vertical plate 5 facing the front plate 2 is provided with a steel sleeve avoiding groove 502 for avoiding the steel sleeve 4.

[0031] As shown in the drawings, Figure 5 The mounting hole 501 is a square through hole matched with the pull rod fixing seat 7. The pull rod fixing seat 7 passes through the mounting hole, and is connected with the two pull rods 6 through the two connecting holes 701 on the pull rod fixing seat 7, and the pull rod force directly acts on the vertical plate 5.

[0032] In this embodiment, the pull rod fixing seat 7 passes through the mounting hole on the vertical plate, is symmetrically assembled relative to the vertical plate, the pull rod as a whole passes through the pull rod through hole of the front plate, and is screwed at the end of the pull rod with the pull rod fixing seat. The pull rod passes through the pull rod through hole of the front plate, the end is connected with the pull rod fixing seat through the thread, the front plate does not bear the pull rod force, and only plays a supporting role for the vertical plate.

[0033] In summary, the pull rod mechanism of the power end of the fracturing pump provided in the application avoids the traditional problems of easy failure of the front plate thread of the power end pump shell and easy cracking of the front plate weld by increasing the pull rod fixing seat, simplifies the structure of the peripheral weld of the front plate of the pump shell, reduces the deformation of the pump shell, improves the strength of the pull rod, and improves the service life and reliability of the fracturing pump under high load working conditions of the power end.

[0034] Embodiment 2: A fracturing pump power end is provided, including the fracturing pump power end tie rod mechanism of any one of Embodiment 1.

[0035] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only used to explain the relative positional relationship, movement condition and the like between the components in a certain specific posture. If the specific posture changes, the directional indication also changes accordingly. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0036] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A pull rod mechanism at the power end of a fracturing pump, characterized in that: It includes a pull rod, a pull rod fixing seat and a pump casing; the pump casing includes a front plate and a vertical plate connected to each other; The vertical plate is provided with a mounting hole for passing the pull rod fixing seat, and the pull rod fixing seat is assembled in the mounting hole; The pull rod fixing seat is provided with a connection hole for connecting the pull rod; The front plate is provided with a pull rod through hole for the pull rod to pass through; The pull rod passes through the pull rod through hole on the front plate and is connected with the connecting hole on the pull rod fixing seat.

2. The pull rod mechanism at the power end of the fracturing pump according to claim 1, characterized in that: The pump casing also includes an upper sealing plate, a lower sealing plate and a steel sleeve; the upper plane of the front plate is welded to the upper sealing plate, the lower plane of the front plate is welded to the lower sealing plate, the rear plane of the front plate is welded to the vertical plate, and a steel sleeve hole is opened in the middle of the front plate and welded to the steel sleeve to form the main frame.

3. The pull rod mechanism at the power end of the fracturing pump according to claim 2, characterized in that: The vertical plate is welded vertically on the rear plane of the front plate, the upper sealing plate is welded on the upper side of the front plate and the vertical plate, and the lower sealing plate is welded on the lower side of the front plate and the vertical plate to support and strengthen the vertical plate.

4. The pull rod mechanism at the power end of the fracturing pump according to claim 1, characterized in that: The connecting hole is a threaded through hole, which is used for threaded connection of the pull rod.

5. The fracturing pump power end pull rod mechanism according to claim 1 or 4, characterized in that: The pull rod fixing seat is a symmetrical structure and is symmetrically provided with two connecting holes.

6. The pull rod mechanism at the power end of the fracturing pump according to claim 5, characterized in that: The pull rod fixing seat is symmetrically assembled relative to the vertical plate, wherein one connecting hole is connected to a pull rod on the first side of the vertical plate, and the other connecting hole is connected to another pull rod on the second side of the vertical plate.

7. The pull rod mechanism at the power end of the fracturing pump according to claim 1, characterized in that: A steel sleeve avoidance groove is provided on one end of the vertical plate facing the front plate.

8. The pull rod mechanism at the power end of the fracturing pump according to claim 1, characterized in that: The mounting hole is a square through hole that matches the pull rod fixing seat.

9. The pull rod mechanism at the power end of the fracturing pump according to claim 1, characterized in that: The pull rod fixing seat is made of alloy steel, and the yield strength of the pull rod fixing seat is greater than 600 MPa.

10. A fracturing pump power end, characterized in that: It comprises the pull rod mechanism at the power end of a fracturing pump according to any one of claims 1 to 9.

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