Power end shell of plunger pump and plunger pump

Abstract

The utility model discloses a power end shell of a plunger pump and the plunger pump, the power end shell of the plunger pump comprises a bearing seat, a sliding sleeve seat, a spacing plate used for supporting the bearing seat and a front end plate provided with a connecting point used for fixing a fluid end, and a plurality of first reinforcing ribs are arranged at the connecting position between the bearing seat and the spacing plate. The reinforcing ribs are arranged at the specific positions of the power end shell, so that the stress state of the power end shell is improved, the stress concentration effect of the power end shell can be effectively reduced, the rigidity and the strength of a product structure are improved, and meanwhile the service life of the plunger pump can be prolonged.

Description

Technical Field

[0001] The utility model relates to a power end housing of a plunger pump and a plunger pump, belonging to the technical field of plunger pump manufacturing. Background Art

[0002] The plunger pump is a commonly used production equipment in the oil field industry. The plunger pump is generally composed of a power end assembly and a hydraulic end assembly. The function of the power end assembly is to convert the rotary motion of the prime mover such as the motor and diesel engine into linear reciprocating motion through the crank slider mechanism, and transmit the mechanical energy to the hydraulic end. The function of the hydraulic end assembly is to convert the operating medium from low pressure to high pressure and realize pumping and transportation, and convert mechanical energy into pressure potential energy.

[0003] The power end assembly generally includes a deceleration part that reduces the speed and increases the torque, a crank slider mechanism part that converts rotary motion into linear reciprocating motion (components generally include crankshafts, connecting rods, crossheads, bearings, bearings, etc.), a lubrication system part that provides lubrication for gear pairs, bearings, and friction pairs, and a housing that accommodates the deceleration part and crank slider mechanism.

[0004] The load of the plunger pump is generally large, and due to restrictions on assembly and transportation, there are certain weight restrictions on the plunger pump and the supporting complete equipment. The power end housing of the traditional plunger pump is prone to housing stress concentration effect, the rigidity and strength of the product structure are not high, and the service life is short.

[0005] In addition, with the improvement of operating requirements (such as the discharge pressure and discharge flow of the plunger pump are getting higher and higher), the plunger pump with a small transmission ratio requires a higher input torque, and the requirements for transmission components such as motors, engines, and gearboxes are also higher, and even affect the service life. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a power end housing and a plunger pump of a plunger pump in view of the deficiencies of the prior art. By arranging reinforcing ribs at specific positions of the power end housing, the stress state of the power end housing is improved, the stress concentration effect of the power end housing can be effectively reduced, the rigidity and strength of the product structure can be improved, and the service life of the plunger pump can be extended.

[0007] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0008] The utility model provides a power end housing of a plunger pump, comprising a bearing seat, a sleeve seat, a spacer plate for supporting the bearing seat and a front end plate provided with a connection point for fixing the hydraulic end, and a plurality of first reinforcing ribs are provided at the connection between the bearing seat and the spacer plate.

[0009] In order to improve the ability of the bearing seat hole to resist deformation and reduce the stress concentration effect between the bearing seat and the spacer plate, a plurality of the first reinforcing ribs are arranged in an annular manner along the outer periphery of the bearing seat.

[0010] In order to avoid fatigue cracking in the area of ​​the partition plate located between the front end plate and the bearing seat (especially the area close to the height of the connection point), a second reinforcing rib is arranged on the partition plate, and the extension direction of the second reinforcing rib is arranged parallel to the axis of the sliding sleeve seat, and the height of the second reinforcing rib is arranged corresponding to the height of the connection point.

[0011] Preferably, the second reinforcing rib is fixedly connected to the front end plate and / or the bearing seat.

[0012] In order to avoid fatigue cracking at the sliding sleeve seat, a third reinforcing rib is provided at at least one position above and below the sliding sleeve seat, and the extension direction of the three reinforcing ribs is parallel to the axis of the sliding sleeve seat.

[0013] In order to more effectively increase the rigidity of the sliding sleeve seat, resist the downward pressure of the sliding sleeve seat from the matching part of the sliding sleeve seat, and reduce the deformation of the sliding sleeve seat, the angle between the shortest line between the center of the third reinforcing rib and the axis of the sliding sleeve seat and the vertical direction is not greater than 60°.

[0014] Preferably, the third reinforcing rib is fixedly connected to the front end plate.

[0015] The utility model also provides a plunger pump, which comprises the power end housing as described above.

[0016] In order to reduce the input torque requirement and ease the design difficulty of the plunger pump, the plunger pump includes a gear pair with a transmission ratio of 7 to 8.5.

[0017] In summary, the utility model improves the stress state of the power end housing by arranging reinforcing ribs at specific positions of the power end housing, which can effectively reduce the stress concentration effect of the power end housing, improve the rigidity and strength of the product structure, and extend the service life of the plunger pump.

[0018] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the power end housing of the plunger pump of the utility model;

[0020] Figure 2 It is a schematic longitudinal section diagram of the power end housing of the plunger pump of the utility model;

[0021] Figure 3 It is a schematic cross-sectional view of the sliding sleeve seat of the power end housing of the plunger pump of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the gear pair of the plunger pump of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the power end housing and gear pair of the plunger pump of the utility model. DETAILED DESCRIPTION

[0024] Figure 1 It is a structural schematic diagram of the power end housing of the plunger pump of the utility model; Figure 2 It is a schematic longitudinal section diagram of the power end housing of the plunger pump of the utility model; Figure 3 Schematic diagram of the cross section of the sliding sleeve seat of the power end housing of the plunger pump of the utility model. Figures 1 to 3 As shown, the utility model provides a power end housing 100 of a plunger pump, the power end housing of the plunger pump includes a bearing seat 200, a sleeve seat 300, a spacer plate 400 and a front end plate 500, wherein the bearing seat 200 is used to install a crankshaft bearing, the sleeve seat 300 is used to accommodate a reciprocating crosshead, the spacer plate 400 is vertically arranged to support the bearing seat 200, and the front end plate 500 is located on the side of the sleeve seat 300 away from the bearing seat 200, and a connection point 510 for fixing the hydraulic end is arranged on it. As required, the power end housing may also include a lubrication channel 620, a cover plate 600 and other structures. The cover plate 600 encloses the power end housing 100 of the plunger pump into a semi-enclosed space, on which structures such as an observation hole 610 and an oil return hole may be arranged as required. The lubrication channel 620 is used to provide an interface, support, oil passage, etc. for the lubrication pipeline.

[0025] Specifically, the plane where the spacer plate 400 is located is orthogonal to the axis A of the bearing seat 200, a plurality of spacer plates 400 are arranged in parallel and spaced apart along the axis A of the bearing seat 200, and the axis B of the sleeve seat 300 is perpendicular to the axis A of the bearing seat 200. When the plunger pump is normally assembled, the axis A of the bearing seat 200 and the axis B of the sleeve seat 300 are both parallel to the horizontal plane.

[0026] According to the operating principle of the plunger pump, the bearing seat 200, the spacer plate 400, the sleeve seat 300, the front end plate 500, etc. are the main bearing structures. In order to improve the ability of the bearing seat hole to resist deformation and reduce the stress concentration effect between the bearing seat 200 and the spacer plate 400, a plurality of first reinforcing ribs 700 are provided at the connection between the bearing seat 200 and the spacer plate 400. Exemplarily, the plurality of first reinforcing ribs 700 are arranged in an annular interval along the outer periphery of the bearing seat (specifically the bearing seat hole).

[0027] The first reinforcing rib 700 increases the mechanical strength of the transition area between the bearing seat 200 and the spacer plate 400. The inventor of the utility model has found in the long-term practice and research process that the area of ​​the spacer plate 400 between the front end plate 500 and the bearing seat 200 (especially the area close to the height of the connection point 510) and the sliding sleeve seat 300 are also locations where fatigue cracking is prone to occur.

[0028] Therefore, in the present invention, the partition plate 400 is provided with a second reinforcing rib 800, the extension direction of the second reinforcing rib 800 is arranged parallel to the axis B of the sliding sleeve seat 300, and the height of the second reinforcing rib 800 is arranged corresponding to the height of the connection point 510 for fixing the hydraulic end on the front end plate 500, that is, the height of the second reinforcing rib 800 and the height of the connection point 510 can be the same, approximately the same or similar, and those skilled in the art can make design choices according to actual needs. The second reinforcing rib 800 can be arranged on one side or both sides of the partition plate 400 (such as Figure 3 shown).

[0029] It should be noted that when the front end plate 500 is provided with connection points 510 at different heights, the second reinforcing ribs 800 (such as Figure 3 As shown), of course, the second reinforcing rib 800 may be selectively provided, and it is not necessary to provide the second reinforcing rib 800 near all the connection points 510, and the present invention is not limited thereto.

[0030] According to different design requirements, the second reinforcing rib 800 can be fixedly connected to the front end plate 500 and / or the bearing seat 200 .

[0031] In order to improve the rigidity and strength of the sleeve seat 300 and reduce the deformation of the crosshead sleeve so that the shell is more evenly stressed and the friction is more even, a third reinforcing rib 900 is provided at at least one position above and below the sleeve seat 300, and the extension direction of the third reinforcing rib 900 is parallel to the axis B of the sleeve seat 300.

[0032] In order to more effectively increase the rigidity of the sliding sleeve seat 300, resist the downward pressure of the matching part of the sliding sleeve seat 300 on the sliding sleeve seat 300, and reduce the deformation of the sliding sleeve seat 300, the angle between the shortest line between the center of the third reinforcing rib 900 and the axis B of the sliding sleeve seat 300 and the vertical direction is not greater than 60°. In this example, the angle between the shortest line between the center of the third reinforcing rib 900 and the axis B of the sliding sleeve seat 300 and the vertical direction is 0°, that is, the shortest line between the center of the third reinforcing rib 900 and the axis B of the sliding sleeve seat 300 is located in the vertical direction.

[0033] According to different design requirements, the third reinforcing rib 900 can be fixedly connected to the front end plate 500 .

[0034] It should be added that the present invention does not limit the connection method of the above-mentioned reinforcing ribs (the first reinforcing rib 700, the second reinforcing rib 800 and the third reinforcing rib 900), which can be connected to the power end housing 100 by welding or by casting.

[0035] The utility model also provides a plunger pump, which includes the power end housing 100 as described above.

[0036] Figure 4 It is a structural schematic diagram of the gear pair of the plunger pump of the utility model; Figure 5 This is a schematic diagram of the structure of the power end housing and gear pair of the plunger pump of the utility model. Figure 4 and Figure 5 As shown, the plunger pump of the utility model also includes a gear pair with a transmission ratio of 7 to 8.5, and the gear pair includes a crankshaft 111 and a gear shaft 112. Large gears 113 are arranged at both ends of the crankshaft 111, and a small gear 114 corresponding to the large gear 113 is arranged on the gear shaft 112. The diameter of the large gear 113 is larger than the diameter of the small gear 114. The large gear 113 is gear-meshed with the small gear 114. One end of the gear shaft 112 is also provided with a connecting portion 115 connected to an external transmission member. The crankshaft 111 can be arranged in the bearing seat 200 of the power end housing 100 through a bearing.

[0037] As the operating requirements increase, the current plunger pumps with small transmission ratios (such as transmission ratios within 6.5) require higher input torques, and the requirements for transmission components such as motors, engines, and gearboxes are also higher, and even affect the service life. The utility model reduces the input torque requirements by limiting the transmission ratio of the gear pair to 7 to 8.5, reduces the design difficulty of the plunger pump, and extends the service life.

[0038] In summary, the utility model provides a power end housing of a plunger pump and a plunger pump. By arranging reinforcing ribs at specific positions of the power end housing, the stress state of the power end housing is improved, the stress concentration effect of the power end housing can be effectively reduced, the rigidity and strength of the product structure can be improved, and the service life of the plunger pump can be extended.

Claims

1. A power end housing of a plunger pump, comprising a bearing seat, a sleeve seat, a spacer plate for supporting the bearing seat, and a front end plate provided with a connection point for fixing the hydraulic end, characterized in that: A plurality of first reinforcing ribs are arranged at the connection between the bearing seat and the spacer plate.

2. The power end housing of the plunger pump according to claim 1, characterized in that: A plurality of the first reinforcing ribs are arranged in an annular manner along the outer circumference of the bearing seat.

3. The power end housing of the plunger pump according to claim 1, characterized in that: The partition plate is provided with a second reinforcing rib, the extension direction of the second reinforcing rib is arranged parallel to the axis of the sliding sleeve seat, and the height of the second reinforcing rib is arranged corresponding to the height of the connection point.

4. The power end housing of the plunger pump according to claim 3, characterized in that: The second reinforcing rib is fixedly connected to the front end plate and / or the bearing seat.

5. The power end housing of the plunger pump according to claim 1 or 3, characterized in that: A third reinforcing rib is arranged at at least one position above and below the sliding sleeve seat, and the extending direction of the three reinforcing ribs is arranged parallel to the axis of the sliding sleeve seat.

6. The power end housing of the plunger pump according to claim 5, characterized in that: The angle between the shortest line between the center of the third reinforcing rib and the axis of the sliding sleeve seat and the vertical direction is not greater than 60°.

7. The power end housing of the plunger pump according to claim 6, characterized in that: The third reinforcing rib is fixedly connected to the front end plate.

8. A plunger pump, characterized in that: The plunger pump comprises a power end housing according to any one of claims 1 to 7.

9. The plunger pump according to claim 8, characterized in that The plunger pump includes a gear pair with a transmission ratio of 7 to 8.5.

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