Five-cylinder pump

Abstract

The utility model relates to the technical field of piston pumps, and provides a five-cylinder pump which comprises a power end and a fluid end, the power end comprises a shell and a crankshaft, and the crankshaft is rotationally arranged in the shell; the transmission gear is arranged on the crankshaft and located in the shell. By means of the technical scheme, the problem that in the prior art, a transmission gear of a five-cylinder pump is externally arranged, and the oil leakage risk exists is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of piston pumps, and in particular to a five-cylinder pump. Background Art

[0002] In drilling operations, the mud pump is a critical piece of equipment, often called the "heart" of the drilling rig. Quintuplex pumps are widely used in drilling, grouting, and other operations. They provide a large displacement and stable pressure, meeting the requirements for drilling fluid circulation and delivery during the drilling process.

[0003] Common quintuple pumps include quintuple piston pumps and quintuple plunger pumps. Their structures and operating principles are relatively similar. For example, the quintuple piston pump operates by changing the volume of a sealed working chamber through the reciprocating motion of the piston within the pump body, thereby achieving the suction and discharge of liquid. Specifically, when the piston moves backward, the volume within the pump body increases, creating negative pressure that draws liquid into the pump body. When the piston moves forward, the volume within the pump body decreases, increasing pressure and expelling liquid from the pump body.

[0004] However, the existing five-cylinder pump still has the following problems:

[0005] 1. The transmission gear is external and requires an external protective case. The protective case cannot meet the installation foundation requirements of the direct drive motor, and there is a high risk of oil leakage at the surrounding sealing surface;

[0006] 2. The overall structure is not compact enough and occupies a large space;

[0007] 3. The L-shaped pump head is not compact enough, is large in size and expensive, and has poor suction performance.

[0008] Therefore need to improve existing five-cylinder pump, to solve the above problems. Utility Model Content

[0009] The utility model provides a five-cylinder pump, which solves the problem in the related art that the transmission gear of the five-cylinder pump is externally arranged and the risk of oil leakage is relatively high.

[0010] The technical solution of the utility model is as follows:

[0011] A five-cylinder pump includes a power end and a hydraulic end, wherein the power end includes:

[0012] case;

[0013] a crankshaft, rotatably disposed within the housing;

[0014] A transmission gear is provided on the crankshaft, and the transmission gear is located inside the housing.

[0015] As a further technical solution, the power end further includes:

[0016] There are several support frames, which are arranged at intervals in the shell, and the crankshaft is rotatably arranged on the support frames.

[0017] As a further technical solution, there are several transmission gears distributed at intervals on the crankshaft.

[0018] As a further technical solution, the crankshaft has a plurality of crank portions, which are respectively located between two adjacent support frames or between adjacent support frames and the transmission gear. The power end further includes:

[0019] There are several connecting rods, one end of each connecting rod is movably connected to one of the crank parts of the crankshaft;

[0020] A crosshead is movably arranged in the housing, the other end of the connecting rod is movably connected to the crosshead, and the crosshead has a ball head mounting position;

[0021] The middle pull rod has a ball head, and the ball head is connected to the ball head mounting position in a ball joint pair.

[0022] As a further technical solution, the hydraulic end includes:

[0023] A short rod, arranged on the middle pull rod;

[0024] The piston rod is arranged on the short rod.

[0025] As a further technical solution, the hydraulic end further includes:

[0026] an inverted L-shaped pump head, disposed on the housing, the inverted L-shaped pump head having a cylinder sleeve;

[0027] The piston is provided on the piston rod, is located in the cylinder sleeve, and abuts against the inner wall of the cylinder sleeve.

[0028] As a further technical solution, the inverted L-shaped pump head further comprises a liquid inlet cavity and a liquid discharge cavity, wherein the liquid inlet cavity is close to the cylinder liner and communicates with the cylinder liner, and the liquid discharge cavity is communicated with the liquid inlet cavity. The hydraulic end further comprises:

[0029] a liquid inlet valve assembly, arranged between the liquid inlet cavity and the water suction pipe;

[0030] The liquid discharge valve assembly is arranged between the liquid inlet cavity and the liquid discharge cavity.

[0031] As a further technical solution, the power end further includes:

[0032] an upper guide plate, disposed in the housing;

[0033] The lower guide plate is arranged in the shell and is located below the upper guide plate. The crosshead is movably arranged between the upper guide plate and the lower guide plate.

[0034] As a further technical solution, the upper guide plate and the lower guide plate are arc-shaped and arranged opposite to each other up and down.

[0035] As a further technical solution, the power end further includes:

[0036] An upper support is provided on the inner wall of the shell, the upper guide plate is fixedly provided on the upper support, the upper support has a first positioning groove, the upper guide plate has a first positioning protrusion, and the first positioning protrusion is clamped in the first positioning groove;

[0037] The lower support is arranged on the inner wall of the shell, the lower guide plate is fixedly arranged on the lower support, the lower support has two positioning grooves, the lower guide plate has two positioning protrusions, and the two positioning protrusions are clamped in the two positioning grooves.

[0038] The working principle and beneficial effects of the utility model are as follows:

[0039] In the utility model, the transmission gear is built into the housing, and no external protective shell is required, which reduces the risk of oil leakage and improves the reliability of the equipment.

[0040] Generally, a five-cylinder pump has two transmission gears and six built-in brackets. The brackets are used to install the crankshaft and isolate the connecting rod. In this embodiment, the transmission gears are installed at the positions of two of the brackets. The brackets at these positions are removed. In this way, the six brackets are changed to four brackets. There is no need to expand the space for the transmission gears, and the overall structure is not expanded. At the same time, the protective shell is removed, so it is more compact, occupies less space, and is easy to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The preferred embodiments will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0042] Figure 1 It is a schematic diagram of the structure of a five-cylinder pump in the prior art;

[0043] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0044] Figure 3 This is a schematic diagram of the cross-sectional structure of the utility model from above;

[0045] Figure 4 This is a schematic diagram of the side sectional structure of the utility model;

[0046] Figure 5 for Figure 2 Schematic diagram of the enlarged structure of the middle part A;

[0047] Figure 6 for Figure 2 Middle part B is an enlarged structural diagram;

[0048] In the figure: 1. power end, 2. hydraulic end, 3. housing, 4. crankshaft, 5. transmission gear, 6. support frame, 7. crank part, 8. connecting rod, 9. crosshead, 10. ball head mounting position, 11. intermediate pull rod, 12. ball head, 13. short rod, 14. piston rod, 15. inverted L-shaped pump head, 16. cylinder liner, 17. piston, 18. liquid inlet chamber, 19. liquid discharge chamber, 20. liquid inlet valve assembly, 21. liquid discharge valve assembly, 22. upper guide plate, 23. lower guide plate, 24. upper support, 25. positioning groove 1, 26. positioning convex part 1, 27. lower support, 28. positioning groove 2, 29. positioning convex part 2, 30. protective shell. DETAILED DESCRIPTION

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0050] To simplify the drawings, only the parts relevant to the utility model are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0051] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0052] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0053] like Figures 2 to 6As shown, a five-cylinder pump is proposed, including a housing 3 and a power end 1 arranged on the housing 3, the power end 1 includes a crankshaft 4, the crankshaft 4 is rotatably arranged in the housing 3; a transmission gear 5 is arranged on the crankshaft 4, and the transmission gear 5 is located inside the housing 3.

[0054] like Figure 1 As shown, the existing five-cylinder pumps mostly have an external transmission gear 5 installed in a protective shell 30. The protective shell 30 is mostly a split structure connected by bolts, and a mounting hole for the crankshaft 4 is also required. With this arrangement, there is a risk that the lubricating oil on the transmission gear 5 will leak out of the protective shell 30, affecting the use of the pump body and making maintenance inconvenient.

[0055] In the prior art, the gear is externally mounted, with only a protective housing 30. This housing 30 is not strong enough to meet the weight and torque requirements of the direct-drive motor. To address the problems of the external transmission gear 5 of the related art quintuple pump, resulting in a wide pump unit, an inability to mount the direct-drive motor, and a high risk of oil leakage, this embodiment integrates the transmission gear 5 within the housing 3. This allows for the installation of the direct-drive motor without the need for an external protective housing 30, reducing the risk of oil leakage and improving equipment reliability.

[0056] Generally, a five-cylinder pump has two transmission gears 5 and six built-in brackets. The brackets are used to install the crankshaft 4 and isolate the connecting rod 8. In this embodiment, the transmission gear 5 is installed at the position of two of the brackets. The brackets at these positions are removed. In this way, the six brackets are changed to four brackets. There is no need to expand the space for the transmission gear 5, and the overall structure is not expanded. At the same time, the protective shell 30 is removed, so it is more compact, occupies less space, and is easy to install and disassemble.

[0057] Furthermore, a plurality of support frames 6 are provided at intervals in the housing 3 , and the crankshaft 4 is rotatably provided on the support frames 6 .

[0058] Furthermore, there are a plurality of transmission gears 5 , which are distributed on the crankshaft 4 at intervals.

[0059] In this embodiment, the support frame 6 is the bracket mentioned above, which is made of low-alloy high-strength structural steel. These support frames 6 are arranged at intervals inside the shell 3, and the crankshaft 4 is installed on these support frames 6 through split bearings to ensure its smooth rotation.

[0060] Furthermore, the crankshaft 4 has a plurality of cranked portions 7, each located between two adjacent support frames 6 or between adjacent support frames 6 and transmission gears 5. The power end 1 also includes a plurality of connecting rods 8, one end of each connecting rod 8 being movably connected to a cranked portion 7 of the crankshaft 4; a crosshead 9 is movably disposed within the housing 3, and the other end of the connecting rod 8 is movably connected to the crosshead 9. The crosshead 9 has a ball head mounting position 10, an intermediate tie rod 11, and a ball head 12, which is connected to the ball head mounting position 10 in a spherical joint pair.

[0061] In this embodiment, there are several connecting rods 8, each of which is movably connected to a crank portion 7 of the crankshaft 4 at one end and to a crosshead 9 at the other end. Connecting rods 8 are made of high-quality alloy steel, exhibiting excellent strength and toughness. This is prior art and will not be elaborated upon further.

[0062] Furthermore, a short rod 13 is provided on the intermediate pull rod 11 ; and a piston rod 14 is provided on the short rod 13 .

[0063] Furthermore, the hydraulic end 2 also includes an inverted L-shaped pump head 15, which is arranged on the housing 3 and has a cylinder sleeve 16; the piston 17 is arranged on the intermediate pull rod 11, located in the cylinder sleeve 16, and abuts against the inner wall of the cylinder sleeve 16.

[0064] In this embodiment, the crosshead 9 is movably disposed within the housing 3 and has a ball head mounting position 10. By arranging the connecting rod 8 and the crosshead 9 in a spherical joint connection, the connecting rod 8 and the crosshead 9 can deflect and adjust in three degrees of freedom, thereby improving the self-aligning performance, effectively reducing the eccentric wear of the cylinder liner 16 and the piston 17, and extending the service life of the cylinder liner 16 and the piston 17.

[0065] In addition, there are two types of pumps: piston 17 pumps and plunger pumps. Here, a piston 17 pump having a piston rod 14 and a piston 17 is taken as an example.

[0066] Furthermore, the inverted L-shaped pump head 15 also has an inlet chamber 18 and a discharge chamber 19. The inlet chamber 18 is close to the cylinder liner 16 and is connected to the cylinder liner 16. The discharge chamber 19 is connected to the inlet chamber 18. The inlet valve assembly 20 is arranged between the inlet chamber 18 and the suction pipe; the discharge valve assembly 21 is arranged between the inlet chamber 18 and the discharge chamber 19.

[0067] The common L-shaped pump head can refer to the structure described in the utility model patent with publication number CN2481877Y. In this embodiment, as shown in the figure, the reverse L-shaped pump head 15 refers to the installation position of the liquid inlet valve assembly 20 and the liquid discharge valve assembly 21 being swapped. In this way, the volume of the liquid inlet chamber 18 becomes smaller, the clearance of the hydraulic end 2 is small, and the suction flow channel is more reasonable, and the suction performance is better.

[0068] Furthermore, the power end 1 further includes an upper guide plate 22 , which is disposed in the housing 3 ; a lower guide plate 23 is disposed in the housing 3 , below the upper guide plate 22 , and the crosshead 9 is movably disposed between the upper guide plate 22 and the lower guide plate 23 .

[0069] Furthermore, the upper guide plate 22 and the lower guide plate 23 are arc-shaped and arranged opposite to each other up and down.

[0070] In this embodiment, the operating space for disassembling and installing the guide plate is limited to the cylinder that needs to be replaced, and the crosshead 9 does not need to be disassembled when disassembling and replacing the upper guide plate 22, and the crankshaft 4 assembly does not need to be disassembled when disassembling and installing the lower guide plate 23. This reduces the steps of replacing the guide plate, reduces labor intensity and replacement difficulty, saves maintenance time, and is particularly suitable for multi-cylinder pumps.

[0071] Furthermore, the power end 1 also includes an upper support 24, which is arranged on the inner wall of the shell 3, and the upper guide plate 22 is fixedly arranged on the upper support 24, and the upper support 24 has a positioning groove 25, and the upper guide plate 22 has a positioning protrusion 26, and the positioning protrusion 26 is stuck in the positioning groove 25; the lower support 27 is arranged on the inner wall of the shell 3, and the lower guide plate 23 is fixedly arranged on the lower support 27, and the lower support 27 has a positioning groove 28, and the lower guide plate 23 has a positioning protrusion 29, and the positioning protrusion 29 is stuck in the positioning groove 28.

[0072] In this embodiment, the provision of the positioning protrusion and the positioning groove limits the forward and backward movement of the guide plate, making it more stable.

[0073] The housing 3 is made of low-alloy, high-strength structural steel, offering high strength and excellent weldability. The power end 1 is mounted on the housing 3 and includes components such as a crankshaft 4, a transmission gear 5, a support frame 6, a connecting rod 8, a crosshead 9, an upper guide plate 22, a lower guide plate 23, an upper support 24, and a lower support 27. When the drive mechanism rotates the drive shaft, the gear on the drive shaft meshes with the transmission gear 5 on the crankshaft 4, which in turn rotates, driving the crankshaft 4. This rotational motion is converted into reciprocating motion by the connecting rod 8 and crosshead 9. The reciprocating motion of the crosshead 9 drives the short rod 13 and piston 17 to reciprocate within the cylinder sleeve 16 of the inverted L-shaped pump head, causing the volume within the hydraulic end 2 to change. When the intermediate tie rod 11 moves backward, the volume within the cylinder sleeve 16 increases, creating negative pressure. This opens the inlet valve assembly 20 and closes the outlet valve assembly 21, allowing drilling fluid to be drawn into the cylinder sleeve 16. When the middle pull rod 11 moves forward, the volume in the cylinder sleeve 16 decreases, the pressure increases, the inlet valve assembly 20 closes, the discharge valve assembly 21 opens, and the drilling fluid is discharged from the cylinder sleeve 16. This cycle is repeated to achieve the circulation and transportation of the drilling fluid.

[0074] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A five-cylinder pump comprising a power end (1) and a fluid end (2), characterized in that: The power end (1) comprises: Housing (3); a crankshaft (4) rotatably disposed within the housing (3); A transmission gear (5) is provided on the crankshaft (4), and the transmission gear (5) is located inside the housing (3).

2. A five-cylinder pump according to claim 1, characterized in that: The power end (1) further comprises: There are a plurality of support frames (6) which are arranged at intervals in the housing (3), and the crankshaft (4) is rotatably arranged on the support frames (6).

3. A five-cylinder pump according to claim 1, characterized in that: There are a plurality of transmission gears (5) distributed at intervals on the crankshaft (4).

4. A five-cylinder pump according to claim 2, characterized in that: The crankshaft (4) has a plurality of crank portions (7), which are respectively located between two adjacent support frames (6) or between adjacent support frames (6) and the transmission gear (5). The power end (1) further includes: There are a plurality of connecting rods (8), one end of each connecting rod (8) is movably connected to one of the crank portions (7) of the crankshaft (4); A crosshead (9) is movably arranged in the housing (3), the other end of the connecting rod (8) is movably connected to the crosshead (9), and the crosshead (9) has a ball head mounting position (10); The middle pull rod (11) has a ball head (12), and the ball head (12) is connected to the ball head mounting position (10) in a spherical joint pair.

5. A five-cylinder pump according to claim 4, characterized in that: The hydraulic end (2) comprises, A short rod (13) is arranged on the middle pull rod (11); The piston rod (14) is arranged on the short rod (13).

6. A five-cylinder pump according to claim 5, characterized in that: The hydraulic end (2) further comprises: An inverted L-shaped pump head (15) is arranged on the housing (3), and the inverted L-shaped pump head (15) has a cylinder sleeve (16); The piston (17) is arranged on the piston rod (14), is located in the cylinder sleeve (16), and abuts against the inner wall of the cylinder sleeve (16).

7. A five-cylinder pump according to claim 6, characterized in that: The inverted L-shaped pump head (15) further comprises a liquid inlet chamber (18) and a liquid discharge chamber (19), wherein the liquid inlet chamber (18) is close to the cylinder sleeve (16) and communicates with the cylinder sleeve (16), and the liquid discharge chamber (19) is communicated with the liquid inlet chamber (18). The hydraulic end (2) further comprises: A liquid inlet valve assembly (20) is arranged between the liquid inlet cavity (18) and the water suction pipe; The liquid discharge valve assembly (21) is arranged between the liquid inlet chamber (18) and the liquid discharge chamber (19).

8. The quintuple pump according to claim 4, characterized in that: The power end (1) further comprises: An upper guide plate (22) is disposed in the housing (3); The lower guide plate (23) is arranged in the housing (3) and is located below the upper guide plate (22). The crosshead (9) is movably arranged between the upper guide plate (22) and the lower guide plate (23).

9. The quintuple pump according to claim 8, characterized in that: The upper guide plate (22) and the lower guide plate (23) are arc-shaped and are arranged opposite to each other in the upper and lower directions.

10. The quintuple pump according to claim 8, characterized in that: The power end (1) further comprises: An upper support (24) is provided on the inner wall of the housing (3); the upper guide plate (22) is fixedly provided on the upper support (24); the upper support (24) has a positioning groove (25); the upper guide plate (22) has a positioning protrusion (26); the positioning protrusion (26) is clamped in the positioning groove (25); The lower support (27) is arranged on the inner wall of the shell (3), and the lower guide plate (23) is fixedly arranged on the lower support (27). The lower support (27) has a second positioning groove (28), and the lower guide plate (23) has a second positioning protrusion (29). The second positioning protrusion (29) is stuck in the second positioning groove (28).

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