A high-strength small-bore pump housing structure for a reciprocating plunger pump

Abstract

The application discloses a high-strength small-cylinder-pitch pump shell of a reciprocating plunger pump, which comprises a box body and a shell, the box body comprises an upper cover plate, a lower cover plate, a front end plate, a bearing seat welding assembly and an assembly connecting rib plate, the bearing seat welding assembly comprises a vertical plate, a connecting plate and a bearing seat, a plurality of assembly connecting rib plates are arranged at equal intervals between the bearing seat welding assemblies and are arranged in a double-layer symmetrical mode, large-bevel-V-shaped welding seams are adopted for connecting the upper cover plate and the lower cover plate with the connecting plate and for connecting the upper cover plate and the lower cover plate with the assembly connecting rib plate, the front end plate which is perpendicular to the upper cover plate and the lower cover plate mainly plays a supporting and fixing role for the upper cover plate and the lower cover plate, the main stress carrier of the pump shell is the box body which is composed of the upper cover plate, the lower cover plate and the bearing seat welding assembly, the bending resistance of the pump shell during the reciprocating operation of the plunger is improved, and meanwhile, the fatigue damage of the pump shell caused by bending is reduced.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling and production equipment, and particularly relates to a high-strength, small-cylinder-pitch pump housing for a reciprocating plunger pump. Background Technology

[0002] In the field of oil and gas drilling and production, operations such as cementing, fracturing and acidizing are usually carried out, and reciprocating plunger pumps are an indispensable and important component of cementing equipment, fracturing equipment and acidizing equipment.

[0003] The pump casing of a reciprocating piston pump not only supports and fixes the power-end components such as the crankshaft, but also connects to the hydraulic end via a threaded tie rod, thus securing the hydraulic end. The strength and bending / torsional resistance of the pump casing directly affect the stable operation of the entire pump. When the piston reciprocates, the casing will bend; at this time, the bending resistance of the pump casing has a particularly significant impact on the pump casing's lifespan.

[0004] In the existing structure, the vertical plate of the bearing housing welding assembly is welded to the front end plate, the threaded hole of the tie rod is set on the front end plate, and the bearing housing welding assemblies are connected by stiffening plates. In this case, after the hydraulic end and the power end are connected by tie rods, the pump housing bending caused by the reciprocating motion of the plunger during operation is mainly borne by the front end plate. Due to the limitation of plate thickness and the purpose of weight reduction, the bending at the front end plate is large, which will cause fatigue damage to the pump housing and seriously affect the service life of the plunger pump. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a high-strength, small-pitch pump housing for a reciprocating piston pump, which improves the bending resistance of the pump housing during the reciprocating motion of the piston, reduces fatigue damage to the pump housing caused by bending, and improves the stability of the piston pump and the service life of the pump housing while obtaining a reliable and high-performance pump housing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-strength, small-cylinder-pitch pump housing for a reciprocating piston pump, comprising a casing and a housing. The casing includes an upper cover plate, a lower cover plate, a front end plate, a bearing seat welding assembly, and assembly connecting stiffeners. The bearing seat welding assembly includes a vertical plate, a connecting plate, and a bearing seat. The bearing seat is connected to the vertical plate. Connecting plates are provided on the upper and lower sides of the vertical plate, wherein one end of the upper connecting plate is connected to the bearing seat, and the other end is connected to the upper cover plate; one end of the lower connecting plate is connected to the bearing seat, and the other end is connected to the lower cover plate. The front end plate is perpendicular to and connected to the upper cover plate, lower cover plate, and vertical plate. A plurality of equally spaced assembly connecting stiffeners are provided between the bearing seat welding assemblies. The structure is arranged in a symmetrical double-layer configuration. The component connecting ribs on the side near the bearing housing connect the axially adjacent connecting plates and vertical plates. The upper component connecting ribs on the side near the front end plate connect the axially adjacent connecting plates, vertical plates, and the upper cover plate. The lower component connecting ribs on the side near the front end plate connect the axially adjacent connecting plates, vertical plates, and the lower cover plate. The housing includes mounting plates, reinforcing ribs, connecting ribs, and small cover plates. Several small cover plates are connected to the reinforcing ribs through connecting ribs. All connecting ribs are perpendicular to the reinforcing ribs and connected to all reinforcing ribs. The reinforcing ribs are simultaneously connected to the bearing housing, connecting plates, upper cover plate, lower cover plate, and front end plate in the housing. Several mounting plates are arranged on one side of the lower cover plate.

[0007] In the above technical solution, the upper cover plate and the lower cover plate are provided with groove structures for weight reduction.

[0008] In the above technical solution, on the side where the reinforcing rib plate is connected to the bearing seat, there is a rear reinforcing rib plate of the bearing seat, and the rear reinforcing rib plate of the bearing seat is parallel to the front plate.

[0009] In the above technical solution, reinforcing steel is provided between the reinforcing ribs.

[0010] In the above technical solution, a concealed oil pipe is provided through the reinforcing rib plate, and the two ends of the oil pipe are exposed on both sides of the reinforcing rib plate.

[0011] In the above technical solution, the front end plate is provided with a pull rod through hole, and the upper cover plate and the lower cover plate are provided with pull rod threaded holes coaxial with the pull rod through hole.

[0012] The beneficial effects of this invention are as follows: the width of the upper and lower cover plates of the overall structure, perpendicular to the front end plate, is much greater than the plate thickness. Since the pump casing bending direction caused by the piston pump operation is perpendicular to the front end plate, compared to the structure with threaded connection rods on the front end plate, the axial depth of the threaded rods in this design is increased, thus significantly enhancing bending resistance. Both the upper and lower cover plates are welded to the connecting plate and component connecting stiffeners using a large bevel V-shaped weld. In this case, the bearing seat welding assembly can better assist the upper and lower cover plates in bearing the force, making the entire housing the load-bearing carrier. Simultaneously, this structure does not rely on the continuous weld between the vertical plate and the front end plate for load bearing. Therefore, the continuous weld between the front end plate and the vertical plate can be changed to a discontinuous weld. At this point, the cylinder spacing of the piston pump is not affected by the pump casing structure. After determining the minimum cylinder spacing, the crosshead holes on the front end plate can overlap, greatly reducing the axial length of the piston pump, thereby achieving the goal of compactness and lightweighting of the piston pump. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the housing of the present invention.

[0014] Figure 2 This is a schematic diagram of the housing structure of the present invention.

[0015] Figure 3 This is a schematic diagram of the machined shell structure of the present invention.

[0016] The components are: 1. Upper cover plate, 2. Lower cover plate, 3. Front end plate, 4. Vertical plate, 5. Connecting plate, 6. Bearing housing, 7. Bearing housing welding assembly, 8. Assembly connecting stiffener, 9. Mounting plate, 10. Concealed oil pipe, 11. Bearing housing rear end reinforcing stiffener, 12. Reinforcing stiffener, 13. Connecting stiffener, 14. Small cover plate, 15. Reinforcing steel, 16. Groove structure, 17. Tie rod through hole, 18. Tie rod threaded hole, 19. Mounting hole. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1 and Figure 2The diagram illustrates a high-strength, small-cylinder-pitch reciprocating piston pump housing, comprising a casing and a housing. The casing includes an upper cover plate 1, a lower cover plate 2, a front end plate 3, a bearing seat welding assembly 7, and connecting stiffeners 8. The bearing seat welding assembly 7 includes a vertical plate 4, a connecting plate 5, and a bearing seat 6. The bearing seat 6 is connected to the vertical plate 4. The vertical plate 4 has connecting plates 5 on its upper and lower sides. One end of the upper connecting plate 5 is connected to the bearing seat 6, and the other end is connected to the upper cover plate 1. One end of the lower connecting plate 5 is connected to the bearing seat 6, and the other end is connected to the lower cover plate 2. The front end plate 3 is connected to the cover plate 1, the lower cover plate 2, and the upper cover plate 3. The cover plate 2 and the upright plate 4 are perpendicular and connected. Several component connecting stiffeners 8 are arranged at equal intervals between the bearing seat welding components 7, and are arranged in a double layer symmetrically. The component connecting stiffeners 8 on the side closer to the bearing seat 6 connect the axially adjacent connecting plate 5 and upright plate 4. The upper component connecting stiffeners 8 on the side closer to the front end plate 3 connect the axially adjacent connecting plate 5, upright plate 4 and upper cover plate 1. The lower component connecting stiffeners 8 on the side closer to the front end plate 3 connect the axially adjacent connecting plate 5, upright plate 4 and lower cover plate 2. In this way, a high-strength box structure is formed, which is the main stress-bearing part of the pump housing.

[0019] The housing includes mounting plate 9, concealed oil pipe 10, reinforcing rib plate 12, connecting rib plate 13, and small cover plate 14. Several small cover plates 14 are connected to the reinforcing rib plate 12 through the connecting rib plate 13. All connecting rib plates 13 are perpendicular to the reinforcing rib plate 12 and are connected to all the reinforcing rib plates 12. The reinforcing rib plate 12 is also connected to the bearing seat 6, connecting plate 5, upper cover plate 1, lower cover plate 2, and front end plate 3 in the housing. The concealed oil pipe 10 passes through the reinforcing rib plate 12. Several mounting plates 9 are arranged on one side of the lower cover plate 2, two of which are located below the bearing seat 6 and the remaining one is located below the lower cover plate 2. All of them are connected to the reinforcing rib plate 12. In this way, the housing part of the pump head body is formed, which is its auxiliary force-bearing part.

[0020] In the above technical solution, the upper cover plate 1 and the lower cover plate 2 are provided with a groove structure 16 for weight reduction.

[0021] In the above technical solution, the bearing housing 6 is provided with a bearing housing rear end reinforcing rib plate 11.

[0022] In the above technical solution, reinforcing steel 15 is provided between the reinforcing ribs 12.

[0023] In the above technical solution, a hidden oil pipe 10 is provided on the reinforcing rib plate 12, and the two ends of the oil pipe are exposed on both sides of the reinforcing rib plate.

[0024] like Figure 3As shown, the front end plate 3 is provided with a pull rod through hole 17, and the upper cover plate 1 and lower cover plate 2 are provided with pull rod threaded holes 18 coaxial with the pull rod through hole on the front end plate 3. Therefore, the front end plate 3 mainly serves to support and fix the upper cover plate 1 and lower cover plate 2, rather than bearing the tension from the pull rod and hydraulic end, or the bending force generated by the reciprocating motion of the plunger. The main load-bearing carrier of this invention is the housing composed of the upper cover plate 1, lower cover plate 2, and bearing welding assembly 7, etc., and its bending resistance and strength far exceed those of the pump housing of the prior art, where the main load-bearing carrier is the front end plate.

[0025] When the input power is greater than or equal to 1400 horsepower and the crankshaft input torque is not less than 113000 N·m, the five-cylinder pump housing designed according to the above structure can achieve a cylinder spacing between piston pump cylinders of no more than 9” [228.60 mm]; a pump housing outer dimensions of no more than 1050 mm in length, no more than 1100 mm in width, and no more than 800 mm in height; and a pump housing weight of no more than 900 kg.

[0026] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-strength, small-cylinder-pitch pump housing for a reciprocating piston pump, comprising a casing and a housing, characterized in that: The housing includes an upper cover plate, a lower cover plate, a front end plate, a bearing seat welding assembly, and component connecting stiffeners. The bearing seat welding assembly includes a vertical plate, a connecting plate, and a bearing seat. The bearing seat is connected to the vertical plate. Connecting plates are provided on the upper and lower sides of the vertical plate. One end of the upper connecting plate is connected to the bearing seat, and the other end is connected to the upper cover plate. One end of the lower connecting plate is connected to the bearing seat, and the other end is connected to the lower cover plate. The front end plate is perpendicular to and connected to the upper cover plate, lower cover plate, and vertical plate. Several component connecting stiffeners are arranged at equal intervals between the bearing seat welding assemblies, forming a double-layered symmetrical arrangement. The component connecting stiffeners near the bearing seat connect the axially adjacent connecting plate and vertical plate. The upper component connecting ribs on one side of the end plate connect the axially adjacent connecting plate, upright plate, and upper cover plate. The lower component connecting ribs on the side closer to the front end plate connect the axially adjacent connecting plate, upright plate, and lower cover plate. The housing includes mounting plates, reinforcing ribs, connecting ribs, and small cover plates. Several small cover plates are connected to the reinforcing ribs through connecting ribs. All connecting ribs are perpendicular to the reinforcing ribs and connected to all reinforcing ribs. The reinforcing ribs are also connected to the bearing seats, connecting plates, upper cover plates, lower cover plates, and front end plates in the housing. Several mounting plates are arranged on one side of the lower cover plate. The front end plate is provided with a pull rod through hole. The upper cover plate and lower cover plate are provided with pull rod threaded holes coaxial with the pull rod through hole.

2. The high-strength, small-cylinder-pitch pump housing for a reciprocating piston pump according to claim 1, characterized in that: The upper and lower cover plates are provided with groove structures for weight reduction.

3. The high-strength, small-cylinder-pitch pump housing for a reciprocating piston pump according to claim 1, characterized in that: On the side where the reinforcing rib plate connects to the bearing seat, there is a rear reinforcing rib plate for the bearing seat, which is parallel to the front plate.

4. The high-strength, small-cylinder-pitch pump housing for a reciprocating piston pump according to claim 1, characterized in that: Reinforcing steel is provided between the reinforcing ribs.

5. The high-strength, small-cylinder-pitch pump housing for a reciprocating piston pump according to claim 1, characterized in that: The reinforcing ribs are fitted with concealed oil pipes, with both ends of the oil pipes exposed on the reinforcing ribs on both sides.

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