Internal lubricating system of five-cylinder drilling pump

Abstract

The utility model discloses an internal lubricating system of a five-cylinder drilling pump, which comprises a crankshaft lubricating oil pipeline, a bearing lubricating oil pipeline and a reduction gearbox lubricating oil pipeline which are connected with a lubricating oil tank through a lubricating oil pump and are respectively used for forcibly lubricating parts such as a connecting rod big end, a bearing, a crosshead, a cylinder sleeve and a speed reducer in the five-cylinder drilling pump. The five cylinder sleeves are each provided with a first cylinder sleeve oil return opening and a second cylinder sleeve oil return opening which are communicated with the pump shell bottom oil collecting groove, a pump shell bottom oil return opening is formed in the bottom of the pump shell bottom oil collecting groove, and the pump shell bottom oil return opening is connected with the second lubricating oil tank oil return opening through a pump shell oil return pipeline. A good lubricating system is established, it is guaranteed that all friction pairs are fully lubricated, lubricating oil cools parts in the backflow process, abrasion of the parts is reduced, the service life of equipment is prolonged, and the working efficiency of the five-cylinder drilling pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas drilling equipment, in particular to an internal lubrication system of a five-cylinder drilling pump. Background Art

[0002] Traditional three-cylinder drilling pumps can no longer meet the drilling requirements of high pump pressure and large displacement. It has become a major trend to develop five-cylinder drilling pumps with the characteristics of high power, large displacement, high pressure, small fluctuation of displacement and pressure, high reliability and high efficiency. The power end lubrication system of the drilling pump is one of the most important systems to ensure the best working performance and longest service life of the drilling pump.

[0003] The five-cylinder drilling pump is an innovatively developed device based on the three-cylinder drilling pump. The traditional three-cylinder pump adopts a lubrication method that combines splash lubrication and simple forced lubrication. The splash lubrication part is to drive the gear and the connecting rod big end oil spoon to splash the lubricating oil in the casing to the corresponding oil tank through the rotation of the crankshaft, and then realize the lubrication of the crankshaft bearing and the transmission shaft bearing through the internal oil pipe; the simple forced lubrication part is to realize the lubrication of the crosshead and other points through the internal or external gear oil pump and the corresponding pipeline.

[0004] Since the structure of the five-cylinder drilling pump is very different from that of the three-cylinder drilling pump, the splash lubrication method of the three-cylinder drilling pump cannot be used; if the simple forced lubrication method of the three-cylinder drilling pump is used, there are fewer lubrication points and the friction heat cannot be effectively removed, which in turn aggravates the friction loss between the moving parts of the drilling pump and restricts the working efficiency of the drilling pump. Utility Model Content

[0005] The utility model aims to provide an internal lubrication system for a five-cylinder drilling pump, which respectively injects lubricating oil into the connecting rod big end of the crankshaft, the crosshead in the bearing seat, the bushing, the bearing shell and the reduction box through three lubricating oil pipelines, and recovers the lubricating oil, so as to effectively lubricate the main components and solve the problems existing in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] An internal lubrication system of a five-cylinder drilling pump includes a crankshaft lubrication oil pipeline, a bearing lubrication oil pipeline and a reduction box lubrication oil pipeline, all of which are connected to a lubrication oil tank through a lubrication oil pump; the crankshaft lubrication oil pipeline is connected to a crankshaft oil inlet of the crankshaft oil pipeline, the crankshaft oil pipeline is respectively connected to five connecting rod big end lubrication oil pipelines in the five-cylinder drilling pump, and the connecting rod big end lubrication oil pipelines are respectively connected to the connecting rod big end oil inlets arranged on the connecting rod big end;

[0008] The bearing lubricating oil pipeline is connected to the oil inlet of the hard lubricating oil pipe. The hard lubricating oil pipe is respectively connected to five bearing seats through the first hose, and the hard lubricating oil pipe is respectively connected to five crossheads through the second hose; the second hose is connected to the bushing oil circuit through the crosshead oil circuit, and the bushing oil circuit is connected to the oil inlet of the bushing;

[0009] At the bottom of each of the five cylinder liners, there is a first cylinder liner oil return port communicating with the oil sump at the bottom of the pump housing. At the end of each of the five cylinder liners, there is a second cylinder liner oil return port communicating with the oil sump at the bottom of the pump housing. At the bottom of the oil sump at the bottom of the pump housing, there is a pump housing bottom oil return port, and the pump housing bottom oil return port is connected to the second lubricating oil tank oil return port through the pump housing oil return pipeline;

[0010] The reduction gear lubricating oil pipeline is connected to the reduction gear oil inlet. At the bottom of the reduction gear housing, there is a reduction gear oil return port connected to the reduction gear oil return pipeline, and the reduction gear oil return pipeline is connected to the first lubricating oil tank oil return port.

[0011] Preferably, the lubricating oil pump is connected to the flow distribution valve group, and the flow distribution valve group is respectively connected to the oil inlets of the crankshaft lubricating oil pipeline, the bearing lubricating oil pipeline and the reduction gear lubricating oil pipeline.

[0012] Preferably, the large end lubricating oil pipeline of the connecting rod is also connected to the first connecting rod oil circuit, and the first connecting rod oil circuit is connected to the bearing bush.

[0013] Preferably, the bushing is connected to the oil inlet of the bearing bush through the second connecting rod oil circuit.

[0014] Preferably, a pipe cap is installed at the end of the hard lubricating oil pipe.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] In the present utility model, the crankshaft lubricating oil pipeline, the bearing lubricating oil pipeline and the reduction gear lubricating oil pipeline connected by the lubricating oil pump to the lubricating oil tank respectively perform forced lubrication on components such as the large end of the connecting rod, the bearing, the crosshead, the cylinder liner and the reduction gear in the five-cylinder drilling pump, establishing a good lubrication system, ensuring that all friction pairs are fully lubricated. During the reflux process of the lubricating oil, it cools down the components, reduces the wear of the components, extends the service life of the equipment, and improves the working efficiency of the five-cylinder drilling pump.

[0017] The lubricating pipeline designed in the present utility model has good connectivity, and the lubricating oil can enter each component that needs to be lubricated, ensuring the full lubrication of each component.

[0018] The lubrication system described in the present utility model has a simple structure, and the lubricating oil mainly flows through the oil holes machined inside the components, ensuring the stable operation of the lubrication system.

[0019] The lubricating oil circuit designed by the present utility model can achieve bidirectional lubrication for five bearing bushes and bushings. The specific lubrication direction is determined by the oil pressure in two directions, and the lubricating oil flows to the side with lower pressure, ensuring sufficient lubrication of the bearing bushes and bushings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a block diagram of the present lubrication system;

[0021] Figure 2 is a schematic structural diagram of the present utility model;

[0022] Figure 3 is a schematic structural diagram of the lubricating oil pipeline of the big end of the connecting rod;

[0023] Figure 4 is a schematic structural diagram of the lubricating oil pipeline of the crankshaft;

[0024] In the figure: 1, lubricating oil tank; 2, outlet of the lubricating oil tank; 3, lubricating oil pump; 4, flow distribution valve group; 5, bearing lubricating oil pipeline; 6, crankshaft lubricating oil pipeline; 7, crankshaft oil inlet; 8, inlet of the lubricating oil hard pipe; 9, lubricating oil hard pipe; 10, first hose; 11, second hose; 12, oil return port at the bottom of the pump housing; 13, pipe cap; 14, reducer; 15, oil return pipeline of the pump housing; 16, oil return port of the reduction gearbox; 17, oil return pipeline of the reduction gearbox; 18, oil inlet of the reduction gearbox; 19, lubricating oil pipeline of the reduction gearbox; 20, first oil return port of the lubricating oil tank; 21, second oil return port of the lubricating oil tank; 22, big end of the connecting rod; 23, crankshaft oil circuit; 24, oil inlet of the big end of the connecting rod; 25, lubricating oil pipeline of the big end of the connecting rod; 26, first connecting rod oil circuit; 27, crosshead; 28, crosshead oil circuit; 29, bearing bush; 30, bushing; 31, bushing oil circuit; 32, first cylinder liner oil return port; 33, second connecting rod oil circuit; 34, second cylinder liner oil return port; 35, oil collecting tank at the bottom of the pump housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further describes the present utility model in detail with reference to the accompanying drawings.

[0026] As Figure 1 shown, an internal lubrication system of a five-cylinder drilling pump includes a crankshaft lubricating oil pipeline 6, a bearing lubricating oil pipeline 5, and a reduction gearbox lubricating oil pipeline 19, all of which are connected to a lubricating oil tank 1 through a lubricating oil pump 3; the crankshaft lubricating oil pipeline 6 is communicated with a crankshaft oil inlet 7 of a crankshaft oil circuit 23, the crankshaft oil circuit 23 is respectively connected to five lubricating oil pipelines 25 of the big ends of the connecting rods in the five-cylinder drilling pump, and the lubricating oil pipelines 25 of the big ends of the connecting rods are respectively connected to oil inlets 24 of the big ends of the connecting rods provided on a big end 22 of the connecting rod;

[0027] The bearing lubricating oil pipeline 5 is connected to the lubricating oil hard pipe inlet 8. The lubricating oil hard pipe 9 is respectively connected to five bearing seats through the first hose 10, and the lubricating oil hard pipe 9 is respectively connected to five crossheads 27 through the second hose 11. The second hose 11 is connected to the bushing oil passage 31 through the crosshead oil passage 28, and the bushing oil passage 31 is connected to the inlet of the bushing 30.

[0028] At the bottom of each of the five cylinder liners, a first cylinder liner oil return port 32 communicating with the oil sump 35 at the bottom of the pump housing is provided. At the end of each of the five cylinder liners, a second cylinder liner oil return port 34 communicating with the oil sump 35 at the bottom of the pump housing is provided. At the bottom of the oil sump 35 at the bottom of the pump housing, a pump housing bottom oil return port 12 is provided. The pump housing bottom oil return port 12 is connected to the second lubricating oil tank oil return port 21 through the pump housing oil return pipeline 15.

[0029] The reduction gearbox lubricating oil pipeline 19 is connected to the reduction gearbox inlet 18. At the bottom of the reduction gearbox housing, a reduction gearbox oil return port 16 connected to the reduction gearbox oil return pipeline 17 is provided. The reduction gearbox oil return pipeline 17 is connected to the first lubricating oil tank oil return port 20.

[0030] The lubricating oil oil pump is connected to the flow distribution valve group 4. The flow distribution valve group 4 is respectively connected to the inlets of the crankshaft lubricating oil pipeline 6, the bearing lubricating oil pipeline 5, and the reduction gearbox lubricating oil pipeline 19.

[0031] The connecting rod big end lubricating oil pipeline 25 is also connected to the first connecting rod oil passage 26, and the first connecting rod oil passage 26 is connected to the bearing bush 29.

[0032] The bushing 30 is connected to the inlet of the bearing bush 29 through the second connecting rod oil passage 33.

[0033] A pipe cap 13 is installed at the end of the lubricating oil hard pipe 9.

[0034] When the utility model is in use, lubricating oil is supplied from the lubricating oil tank 1 to the flow distribution valve group 4 through the oil pump 3. The flow distribution valve group 4 then divides the lubricating oil into three paths. The first path of lubricating oil enters the reduction gearbox through the reduction gearbox lubricating oil pipeline 19 for lubricating the components inside the reduction gearbox. The lubricating oil enters the reduction gearbox oil return pipeline 17 from the reduction gearbox oil return port 16 and then flows back to the lubricating oil tank 1. The second path of lubricating oil enters the big end of the connecting rod lubricating oil pipeline 25 through the crankshaft lubricating oil pipeline 6, the crankshaft oil inlet 7, the crankshaft oil passage 23, and the big end of the connecting rod oil inlet 24 to lubricate the big end of the connecting rod 22. At the same time, this path of lubricating oil also provides lubricating oil for the bearing bush 29 through the first connecting rod oil passage 26. The third path of lubricating oil provides lubricating oil for the bearing seat through the lubricating oil hard pipe 9 and the first lubricating oil hose 10, and provides lubricating oil for the crosshead 27 through the second lubricating oil hose 11. At the same time, this path of lubricating oil also provides lubricating oil for the bush 30 and the bearing bush 29 through the crosshead oil passage 28. After the lubrication is completed, the lubricating oil enters the oil sump 35 at the bottom of the pump housing from the first cylinder liner oil return port 32 and the second cylinder liner oil return port 34, and then flows back to the lubricating oil tank 1 through the pump housing bottom oil return port 12 and the pump housing oil return pipeline 15 for recycling.

[0035] The utility model respectively performs forced lubrication on components such as the big end of the connecting rod, bearings, crosshead, cylinder liner, and reducer in the five-cylinder drilling pump through the crankshaft lubricating oil pipeline, bearing lubricating oil pipeline, and reduction gearbox lubricating oil pipeline connected by the lubricating oil pump and the lubricating oil tank, establishes a good lubrication system, ensures sufficient lubrication of all friction pairs, cools the components during the return process of the lubricating oil, reduces the wear of the components, extends the service life of the equipment, and improves the working efficiency of the five-cylinder drilling pump.

[0036] The above are only the preferred examples of the utility model. It should be pointed out that for those of ordinary skill in the art, under the technical inspiration provided by the utility model, other equivalent deformations and improvements can also be made, which should also be regarded as the protection scope of the utility model.

Claims

1. An internal lubrication system for a five-cylinder drilling pump, characterized in that: It comprises a crankshaft lubricating oil pipeline (6), a bearing lubricating oil pipeline (5) and a reduction gearbox lubricating oil pipeline (19) all connected to the lubricating oil tank (1) via a lubricating oil pump (3); the crankshaft lubricating oil pipeline (6) is connected to a crankshaft oil inlet (7) of a crankshaft oil pipeline (23); the crankshaft oil pipeline (23) is respectively connected to five connecting rod big end lubricating oil pipelines (25) in a five-cylinder drilling pump; the connecting rod big end lubricating oil pipelines (25) are respectively connected to connecting rod big end oil inlets (24) provided on the connecting rod big end (22); The bearing lubricating oil pipeline (5) is connected to the lubricating oil hard pipe oil inlet (8); the lubricating oil hard pipe (9) is respectively connected to the five bearing seats through the first hose (10); the lubricating oil hard pipe (9) is respectively connected to the five cross heads (27) through the second hose (11); the second hose (11) is connected to the bushing oil circuit (31) through the cross head oil circuit (28); the bushing oil circuit (31) is connected to the oil inlet of the bushing (30); The bottoms of the five cylinder sleeves are each provided with a first cylinder sleeve oil return port (32) connected to the oil collecting groove (35) at the bottom of the pump casing; the ends of the five cylinder sleeves are each provided with a second cylinder sleeve oil return port (34) connected to the oil collecting groove (35) at the bottom of the pump casing; the bottom of the oil collecting groove (35) at the bottom of the pump casing is provided with a pump casing bottom oil return port (12); the pump casing bottom oil return port (12) is connected to the second lubricating oil tank oil return port (21) via a pump casing oil return pipeline (15); The reduction gearbox lubricating oil pipeline (19) is connected to the reduction gearbox oil inlet (18), the reduction gearbox housing bottom is provided with a reduction gearbox oil return port (16) connected to the reduction gearbox oil return pipeline (17), and the reduction gearbox oil return pipeline (17) is connected to the first lubricating oil tank oil return port (20).

2. The lubrication system according to claim 1, characterized in that: The lubricating oil pump is connected to a flow distribution valve group (4), and the flow distribution valve group (4) is respectively connected to the oil inlets of a crankshaft lubricating oil pipeline (6), a bearing lubricating oil pipeline (5), and a reduction gearbox lubricating oil pipeline (19).

3. The lubrication system according to claim 1 or 2, characterized in that: The connecting rod big end lubricating oil pipeline (25) is also connected to the first connecting rod oil circuit (26), and the first connecting rod oil circuit (26) is connected to the bearing bush (29).

4. The lubrication system according to claim 3, characterized in that: The bushing (30) is connected to the oil inlet of the bearing bush (29) via a second connecting rod oil passage (33).

5. The lubrication system according to claim 4, characterized in that: A pipe cap (13) is installed at the end of the lubricating oil hard pipe (9).

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