An adaptive lubrication high-power power end and a high-pressure extra-large flow plunger pump

Abstract

The present invention relates to a high-power power end with adaptive lubrication and a high-pressure ultra-large flow plunger pump. The present invention includes a crankshaft housing provided with a slideway hole; a crankshaft mechanism including a crankshaft, a connecting rod, a bearing bush and a slider, and the other end of the connecting rod is slidably connected to the slideway hole through the slider; an adaptive lubrication and cooling system including a first lubrication branch and a second lubrication branch; the first lubrication branch includes a first axial oil passage hole provided on the crankshaft housing and a first radial oil passage hole communicated with the slideway hole, and the first radial oil passage hole is communicated with the first axial oil passage hole; the second lubrication branch includes a second axial oil passage hole provided on the crankshaft and second radial oil passage holes respectively provided on each crank throw, and the second radial oil passage holes are communicated with the second axial oil passage hole. The above structure can improve the lubrication and heat dissipation performance and is beneficial to reducing the wear rate.

Description

Technical Field

[0001] The present invention relates to the technical field of mine high-pressure piston pumps, and in particular to a high-power power end with self-adaptive lubrication and a high-pressure ultra-large flow piston pump. Background Art

[0002] The high-pressure ultra-large flow piston pump is the power source of the hydraulic support in the mine working face. Its working principle is that under the drive of the motor, the rotary motion of the crankshaft is converted into the linear reciprocating motion of the slider and the piston through the connecting rod, thereby converting mechanical energy into pressure energy. As the working resistance of the hydraulic support is getting larger and the moving speed is getting faster, higher requirements are put forward for the flow and pressure of the piston pump: the flow of a single piston pump exceeds 1600 L / min, the output pressure is not less than 40 MPa, and the input power is greater than 1200 kW. At present, piston pumps of this power level are still blank in the domestic mine piston pump field. Most large mines with an annual output of more than ten million tons mostly choose imported high-power pump stations. Some industrial and mining enterprises use multiple piston pumps to supply liquid simultaneously to meet the working needs of large mining height working faces. However, there are problems such as high operating costs, high energy consumption, complex control systems, and insufficient underground space, which seriously restrict the comprehensive mining efficiency. Therefore, developing a high-pressure ultra-large flow piston pump group with a flow ≥ 1600 L / min, a pressure ≥ 40 MPa, and a power ≥ 1200 kW close to imported pump stations has become an urgent need in the coal mining industry. Only 1 - 2 liquid supply pumps are required for a single support, the control system is simple, and the required installation space is greatly reduced, with obvious cost and efficiency advantages.

[0003] High-pressure large flow piston pumps are usually five-piston pumps. When the driving power exceeds 1200 kW, the radial load force from the piston on a single load-bearing crank throws exceeds 220,000 N. Since the load-bearing states of each crank throw are different at the same time, it is possible that the mating surface between a certain crank throw and the bearing bush is in direct contact to form boundary lubrication or even dry friction, resulting in a rapid increase in the heat generation power of the friction pair and serious wear of the friction pair. In addition, the slider and the crankcase slideway hole are also key friction pairs. The slider needs to bear the radial component force transmitted by the connecting rod during the reciprocating motion. The greater the radial component force, the easier the slider is to wear. The above two reasons both increase the risk of the friction pair getting stuck, and are extremely likely to cause failures such as "cylinder pulling" and "bearing seizure", thereby affecting the working reliability of the power end and the service life of the piston pump.

[0004] In view of this, in order to study and improve the existing problems, a high-power power end with self-adaptive lubrication and a high-pressure ultra-large flow piston pump are provided, aiming to solve the problems and improve the service performance through this technology. Summary of the Invention

[0005] The object of the present invention is to provide a high-power power end with adaptive lubrication and its high-pressure extra-large flow plunger pump, so as to solve the problems existing in the above-mentioned prior art. The high-power power end with adaptive lubrication provided can adaptively adjust the flow rate of lubricating oil according to the temperature rise of the crankpin friction pair. At the same time, an arc-shaped oil groove is provided on the slider, which can improve the lubrication and heat dissipation performance, is beneficial to reducing the wear rate, and thus reduces the maintenance frequency and maintenance cost.

[0006] To solve the above technical problems, the present invention provides a high-power power end with adaptive lubrication, including:

[0007] A crankshaft housing, in which a slideway hole is provided;

[0008] A crankshaft mechanism arranged in the crankshaft housing, the crankshaft mechanism includes a crankshaft, a connecting rod, a bearing bush and a slider. Along the axial direction of the crankshaft, a plurality of crankpins are provided. One end of the connecting rod is rotatably connected to the crankpin through the bearing bush to form a rotary friction pair, and the other end of the connecting rod is slidably connected to the slideway hole through the slider to form a sliding friction pair;

[0009] An adaptive lubrication and cooling system, the adaptive lubrication and cooling system includes a first lubrication branch communicated with the sliding friction pair and a second lubrication branch communicated with the rotary friction pair;

[0010] Wherein, the first lubrication branch includes a first axial oil passage hole provided on the crankshaft housing and a first radial oil passage hole communicated with the slideway hole, and the first radial oil passage hole is communicated with the first axial oil passage hole;

[0011] Wherein, the second lubrication branch includes a second axial oil passage hole provided on the crankshaft and second radial oil passage holes respectively provided on each crankpin, and the second radial oil passage hole is communicated with the second axial oil passage hole.

[0012] In an embodiment of the present invention, the adaptive lubrication and cooling system further includes a gear pair and an internal drive gear pump driven by it, an external drive motor and an external drive gear pump driven by it, an integrated valve block, a cooler assembly, a filter, a first check valve and a second check valve;

[0013] A three-way oil port is provided on the crankshaft housing. The oil suction side of the internal drive gear pump is connected to the first oil suction port of the three-way oil port through a pipeline, and the oil suction side of the external drive gear pump is connected to the second oil suction port of the three-way oil port through a pipeline;

[0014] The integrated valve block is provided with a first mounting hole, a second mounting hole, a first oil collecting port and a first main flow channel. The first mounting hole is used for mounting a first one-way valve, and the second mounting hole is used for mounting a second one-way valve. The pressure oil side of the inner driving gear pump is communicated with the first one-way valve through a pipeline, and the pressure oil side of the outer driving gear pump is communicated with the second one-way valve through a pipeline. The outlets of the first one-way valve and the second one-way valve converge to the first main flow channel inside the integrated valve block, and are sequentially communicated with the filter and the cooler assembly through the first oil collecting port and a pipeline.

[0015] In an embodiment of the present invention, the integrated valve block is provided with a third mounting hole, a fourth mounting hole, a second oil collecting port and a second main flow channel. A first throttle valve is mounted on the third mounting hole, and a second throttle valve is mounted on the fourth mounting hole. The oil outlet interface of the cooler assembly is connected to the second oil collecting port through a pipeline, and is communicated with the inlets of the first throttle valve and the second throttle valve through the second main flow channel. The outlet of the first throttle valve is communicated with a first lubrication branch, and the outlet of the second throttle valve is communicated with a second lubrication branch. The integrated valve block is further provided with a relief valve. The liquid inlet of the relief valve is communicated with the first main flow channel. The first main flow channel is provided with a first pressure gauge. The liquid return port of the relief valve is communicated with the crankcase through the integrated valve block.

[0016] In an embodiment of the present invention, a second pressure gauge is provided between the first throttle valve and the first lubrication branch, and a third pressure gauge is provided between the second throttle valve and the second lubrication branch.

[0017] In an embodiment of the present invention, the cooler assembly includes a cooling water tank. Two groups of cooling pipe assemblies are provided in the cooling water tank. Each cooling pipe assembly includes a plurality of hollow copper pipes. First flanges and second flanges are provided at both ends of the hollow copper pipes. A first radial sealing groove is provided on the first flange, and a second radial sealing groove is provided on the second flange. The first radial sealing groove and the second radial sealing groove are used for arranging annular sealing rings. The second flange is further provided with a first step, and the first step is connected to the liquid inlet tank through screws.

[0018] In an embodiment of the present invention, the cooling water tank further includes an oil inlet flange, a liquid inlet blanking cover, a liquid inlet joint and an oil inlet blanking cover. The liquid inlet joint is used for being communicated with the liquid supply pipeline of the plunger pump. An oil inlet interface and an oil outlet interface are provided on the outer side of the oil inlet flange. A first annular sealing groove and a second annular sealing groove are provided on the inner side of the oil inlet flange. A third annular sealing groove and a fourth annular sealing groove are provided on the oil inlet blanking cover. The first annular sealing groove, the second annular sealing groove, the third annular sealing groove and the fourth annular sealing groove are all used for arranging annular sealing rings. The oil inlet blanking cover is further provided with a first groove and a second groove, and an oil passing groove is provided between the first groove and the second groove.

[0019] In an embodiment of the present invention, the first axial oil passage hole completely penetrates through both ends of the crankshaft housing. A first joint is provided at the left end of the crankshaft housing. The first joint is used to connect the left end of the first axial oil passage hole to the outlet of the first throttle valve. The right end of the first axial oil passage hole is blocked by a first sealing plug. A throttle plug is provided in the first radial oil passage hole. The upper end of the throttle plug has an external thread and is connected to the internal thread at the upper end of the first radial oil passage hole. The lower part of the throttle plug has a cylindrical step. A first damping hole and a number of uniformly arranged second damping holes are provided in the cylindrical step.

[0020] In an embodiment of the present invention, an annular oil groove and a number of cross-distributed space oil guiding grooves are provided on the bearing surface of the large end of the slider. A wear-resistant alloy layer is also sprayed on the surface of the large end of the slider.

[0021] In an embodiment of the present invention, the second axial oil passage hole completely penetrates through both ends of the crankshaft. A second joint is provided at the left end of the crankshaft housing. The second joint is used to connect the left end of the second axial oil passage hole to the outlet of the second throttle valve. The right end of the second axial oil passage hole is blocked by a second sealing plug. An adaptive thermal-sensitive throttle element is provided in the second radial oil passage hole. The connection mode of the adaptive thermal-sensitive throttle element and the second radial oil passage hole is interference fit or screw installation. The inner hole of the adaptive thermal-sensitive throttle element can expand or contract with temperature change.

[0022] The present invention also provides a high-pressure and super-large-flow plunger pump, including the above-mentioned high-power power end with adaptive lubrication. The high-pressure and super-large-flow plunger pump further includes a bracket, a plunger seal assembly, a valve body, a flow distribution valve assembly and a liquid inlet tank. The bracket is installed and fixed between the crankshaft housing and the valve body through stud bolts. The plunger seal assembly is arranged on the bracket. The flow distribution valve assembly is arranged inside the valve body. The liquid inlet tank is connected to the lower part of the valve body.

[0023] The above technical solutions of the present invention have the following advantages compared with the prior art:

[0024] In the high-power power end with adaptive lubrication provided by the present invention, an adaptive thermal-sensitive throttle element is provided in each radial lubrication hole of the crankshaft. When heat generated by friction between a certain crank throw and the bearing bush accumulates, the inner hole of the adaptive thermal-sensitive throttle element expands due to heat, so that the flow rate flowing into the gap between the crank throw and the bearing bush increases, heat is exchanged, and it is beneficial to the establishment of the oil film pressure in the load-bearing area. When the accumulated heat is released, the adaptive throttle inner hole of the adaptive thermal-sensitive throttle element recovers, and this cycle is repeated to achieve the adaptive lubrication of the crank throw, improve the load-bearing capacity of the oil film, and reduce the risk of seizure of a single friction pair caused by insufficient lubrication or untimely heat dissipation.

[0025] In the high-power power end with adaptive lubrication provided by the present invention, the material of the inner wall surface of the bearing shell is aluminum-tin alloy, and the material of the crankshaft is high-strength alloy steel with a nitrided layer on the surface, which improves the wear resistance and further reduces the risk of seizure of the friction pair.

[0026] In the high-power power end with adaptive lubrication provided by the present invention, arc-shaped oil grooves are arranged on the surface of the big end of the slider in a cross distribution, which can improve the pressure distribution on the surface of the slider, reduce the eccentric wear phenomenon caused by too large a pressure gradient, and at the same time facilitate the discharge of hot oil for heat dissipation. A wear-resistant alloy layer is also sprayed on the surface of the big end of the slider, reducing the wear rate of the friction pair between the slider and the slideway hole.

[0027] In the high-power power end with adaptive lubrication provided by the present invention, throttle valves are arranged in front of both lubrication branches. When the oil pressure of one of the lubrication branches is too low, the throttle valve can be manually adjusted to redistribute the total flow of each lubrication branch to ensure that each lubrication branch is allocated a reasonable oil flow rate.

[0028] In the high-power power end with adaptive lubrication provided by the present invention, the cooling water tank is served by the liquid inlet tank, and the cooler assembly is placed in the liquid inlet tank to replace the external cooler. The working medium can be directly used as the coolant, improving the utilization rate of the working medium and reducing the overall installation size.

[0029] In the high-power power end with adaptive lubrication provided by the present invention, the overflow valve, check valve and throttle valve are arranged on the integrated valve block. The integrated valve block has a high integration degree and a flexible installation method, eliminating the risk of external leakage of the traditional lubricating oil circuit and saving a large amount of time for shutdown and maintenance.

[0030] The high-pressure ultra-large flow plunger pump provided by the present invention has the characteristics of being compact and lightweight, and the overall weight of the plunger pump does not exceed 7.5 tons.

[0031] The high-pressure ultra-large flow plunger pump provided by the present invention can use emulsion or filtered mine water as the working medium, and has functions such as high-pressure water cleaning and mine drainage, with a wide range of practical applications.

[0032] One high-pressure ultra-large flow plunger pump provided by the present invention can replace two 800L / min plunger pumps for simultaneous use, with advantages such as higher efficiency and lower maintenance cost. Moreover, the high-pressure ultra-large flow plunger pump provided by the present invention fills the gap in domestic high-pressure ultra-large flow plunger pumps with a power exceeding 1200kW in the domestic and foreign markets, which is beneficial to improving the fully-mechanized mining efficiency of large working faces. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the content of the present invention easier to be clearly understood, the present invention will be further described in detail below in combination with the specific embodiments of the present invention and the accompanying drawings.

[0034] Figure 1 This is the schematic diagram of the main sectional view of the high-power power end with adaptive lubrication and the high-pressure and extra-large flow plunger pump in the present invention.

[0035] Figure 2 This is the schematic diagram of the front view structure of the high-power power end with adaptive lubrication and the high-pressure and extra-large flow plunger pump in the present invention.

[0036] Figure 3 This is the schematic diagram of the top view structure of the high-power power end with adaptive lubrication and the high-pressure and extra-large flow plunger pump in the present invention.

[0037] Figure 4 This is the schematic diagram of the crankshaft structure of the present invention.

[0038] Figure 5 This is the schematic diagram of the cooler assembly structure of the present invention.

[0039] Figure 6 This is the schematic diagram of the cooling pipe assembly structure of the present invention.

[0040] Figure 7 This is the schematic diagram of the throttle plug structure of the present invention.

[0041] Figure 8 This is the schematic diagram of the oil inlet flange structure of the present invention.

[0042] Figure 9 This is the schematic diagram of the oil inlet blank cover structure of the present invention.

[0043] Figure 10 This is the schematic diagram of the box body of the present invention.

[0044] Figure 11 This is the schematic diagram of the slider of the present invention.

[0045] Figure 12 This is the schematic diagram of the integrated valve block of the present invention.

[0046] Figure 13 It is Figure 12 the schematic diagram of the A-A sectional view.

[0047] Figure 14 It is Figure 12 the schematic diagram of the B-B sectional view.

[0048] Explanation of the reference numerals in the specification drawings:

[0049] 1. Crankshaft housing; 2. Crankshaft; 3. Connecting rod; 4. Bearing shell; 5. Adaptive thermal throttle element; 6. Gear pair; 7. Throttle plug; 8. Slide block; 9. Bracket; 10. Plunger seal assembly; 11. Valve body; 12. Flow distribution valve assembly; 13. Cooler assembly; 14. Cooling pipe assembly; 15. Filter; 16. Inner drive gear pump; 17. Third pressure gauge; 18. Second pressure gauge; 19. Three-way oil port; 20. First joint; 21. First throttle valve; 22. Second throttle valve; 23. Second check valve; 24. Integrated valve block; 25. Relief valve; 26. First pressure gauge; 27. First check valve; 28. Outer drive motor; 29. Outer drive gear pump; 30. First sealing plug; 31. Second sealing plug; 32. Second joint; 33. Cooling water tank; 34. Inlet oil flange; 35. Liquid inlet blank cover; 36. Liquid inlet joint; 37. Inlet oil blank cover

[0050] 101. First axial oil passage hole; 102. First radial oil passage hole; 103. Slideway hole

[0051] 201. Second axial oil passage hole; 202. Second radial oil passage hole; 203. Crank throw

[0052] 701. First damping hole; 702. Second damping hole

[0053] 801. Annular oil groove; 802. Space oil guiding groove

[0054] 1401. First flange; 1402. Hollow copper tube; 1403. Second flange; 1404. First radial sealing groove; 1405. Second radial sealing groove; 1406. First step

[0055] 1901. First oil suction port; 1902. Second oil suction port

[0056] 2401. First main flow channel; 2402. Second main flow channel; 2403. First mounting hole; 2404. First oil collecting port; 2405. Second mounting hole; 2406. Third mounting hole; 2407. Fourth mounting hole; 2408. Second oil collecting port

[0057] 3401. First annular sealing groove; 3402. Second annular sealing groove; 3403. Inlet oil interface; 3404. Outlet oil interface

[0058] 3701. Third annular sealing groove; 3702. Fourth annular sealing groove; 3703. Second groove; 3704. Oil guiding groove; 3705. First groove Embodiment

[0059] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited are not intended to limit the present invention.

[0060] In the present invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of the present invention, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention.

[0061] In the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceeding", etc. are understood not to include the recited number; "above", "below", "within", etc. are understood to include the recited number. In the description of the present invention, if "first" and "second" are described, they are only for the purpose of distinguishing technical features and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0062] In the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

[0063] Refer to Figures 1 to 10 As shown, a high-power power end with adaptive lubrication of the present invention includes:

[0064] A crankcase 1, in which a slideway hole 103 is provided;

[0065] A crankshaft mechanism provided in the crankcase 1, the crankshaft mechanism includes a crankshaft 2, a connecting rod 3, a bearing bush 4, and a slider 8. A plurality of crank throws 203 are provided along the axial direction of the crankshaft. One end of the connecting rod 3 is rotatably connected to the crank throw 2 through the bearing bush 4 to form a rotational friction pair, and the other end of the connecting rod 3 is slidably connected to the slideway hole 103 through the slider 8 to form a sliding friction pair;

[0066] An adaptive lubrication and cooling system, the adaptive lubrication and cooling system includes a first lubrication branch communicated with the sliding friction pair and a second lubrication branch communicated with the rotational friction pair;

[0067] Among them, the first lubrication branch includes a first axial oil passage hole 101 provided on the crankcase body 1 and a first radial oil passage hole 102 communicated with the slideway hole 103, and the first radial oil passage hole 102 is communicated with the first axial oil passage hole 101;

[0068] Among them, the second lubrication branch includes a second axial oil passage hole 201 provided on the crankshaft 2 and second radial oil passage holes 202 respectively provided on each crank throw 203, and the second radial oil passage holes 202 are communicated with the second axial oil passage hole 201.

[0069] Specifically, referring to Figure 2 、 Figures 12 to 14 As shown, the adaptive lubrication and cooling system further includes a gear pair 6 and an inner driving gear pump 16 driven by it, an outer driving motor 28 and an outer driving gear pump 29 driven by it, an integrated valve block 24, a cooler assembly 13, a filter 15, a first one-way valve 27, and a second one-way valve 23;

[0070] A three-way oil port 19 is provided on the crankcase body 1. The oil suction side of the inner driving gear pump 16 is connected to the first oil suction port 1901 of the three-way oil port 19 through a pipeline, and the oil suction side of the outer driving gear pump 29 is connected to the second oil suction port 1902 of the three-way oil port 19 through a pipeline;

[0071] The integrated valve block 24 is provided with a first mounting hole 2403, a second mounting hole 2405, a first oil collecting port 2404 and a first main flow channel 2401. The first mounting hole 2403 is used for mounting the first one-way valve 27, and the second mounting hole 2405 is used for mounting the second one-way valve 23. The oil pressure side of the inner driving gear pump 16 is communicated with the first one-way valve 27 through a pipeline, and the oil pressure side of the outer driving gear pump 29 is communicated with the second one-way valve 23 through a pipeline. The outlets of the first one-way valve 27 and the second one-way valve 23 converge to the first main flow channel 2401 inside the integrated valve block 24, and are sequentially communicated with the filter 15 and the cooler assembly 13 through the first oil collecting port 2404 and a pipeline.

[0072] Specifically, referring to Figures 12 to 14As shown, the integrated valve block 24 is provided with a third mounting hole 2406, a fourth mounting hole 2407, a second oil collecting port 2408 and a second main flow channel 2402. A first throttle valve 21 is mounted on the third mounting hole 2406, and a second throttle valve 22 is mounted on the fourth mounting hole 2407. The oil outlet interface 3404 of the cooler assembly 13 is connected to the second oil collecting port 2408 through a tubing, and is communicated with the inlets of the first throttle valve 21 and the second throttle valve 22 through the second main flow channel 2402. The outlet of the first throttle valve 21 is communicated with a first lubrication branch, and the outlet of the second throttle valve 22 is communicated with a second lubrication branch.

[0073] Specifically, referring to Figure 2 As shown, a second pressure gauge 18 is provided between the first throttle valve 21 and the first lubrication branch, and a third pressure gauge 17 is provided between the second throttle valve 22 and the second lubrication branch.

[0074] Specifically, referring to Figure 2 As shown, the integrated valve block 24 is further provided with a relief valve 25. The liquid inlet of the relief valve 25 is communicated with the first main flow channel 2401. A first pressure gauge 26 is provided on the first main flow channel 2401. The liquid return port of the relief valve 25 is communicated with the crankcase 1 through the integrated valve block 24.

[0075] Specifically, referring to Figure 6 As shown, the cooler assembly 13 includes a cooling water tank 33. Two groups of cooling tube assemblies 14 are provided in the cooling water tank 33. The cooling tube assembly 14 includes a plurality of hollow copper tubes 1402. First flanges 1401 and second flanges 1403 are provided at both ends of the hollow copper tube 1402. A first radial sealing groove 1404 is provided on the first flange 1401, and a second radial sealing groove 1405 is provided on the second flange 1403. The first radial sealing groove 1404 and the second radial sealing groove 1405 are used for arranging an annular sealing ring. The second flange 1403 is further provided with a first step 1406. The first step 1406 is connected to the liquid inlet tank by screws.

[0076] Specifically, referring to Figure 8 、 Figure 9As shown, the cooling water tank 33 further includes an oil inlet flange 34, a liquid inlet blanking cover 35, a liquid inlet joint 36 and an oil inlet blanking cover 37. The liquid inlet joint 36 is used to communicate with the liquid supply pipeline of the plunger pump. An oil inlet interface 3403 and an oil outlet interface 3404 are provided on the outer side of the oil inlet flange 34. A first annular sealing groove 3401 and a second annular sealing groove 3402 are provided on the inner side of the oil inlet flange 34. A third annular sealing groove 3701 and a fourth annular sealing groove 3702 are provided on the oil inlet blanking cover 37. The first annular sealing groove 3401, the second annular sealing groove 3402, the third annular sealing groove 3701 and the fourth annular sealing groove 3702 are all used to arrange annular sealing rings. A first groove 3705 and a second groove 3703 are further provided on the oil inlet blanking cover 37. An oil through groove 3704 is provided between the first groove 3705 and the second groove 3703.

[0077] Specifically, referring to Figure 2 , Figure 3 As shown, the first axial oil through hole 101 completely penetrates through both ends of the crankshaft housing 1. A first joint 20 is provided at the left end of the crankshaft housing 1. The first joint 20 is used to communicate the left end of the first axial oil through hole 101 with the outlet of the first throttle valve 21. The right end of the first axial oil through hole 101 is blocked by a first sealing plug 30.

[0078] Specifically, referring to Figure 7 As shown, a throttle plug 7 is provided in the first radial oil through hole 102. The upper end of the throttle plug 7 has an external thread and is connected to the internal thread at the upper end of the first radial oil through hole 102. The lower part of the throttle plug 7 has a cylindrical step. A first damping hole 701 and a number of uniformly arranged second damping holes 702 are provided in the cylindrical step.

[0079] Specifically, referring to Figure 11 As shown, an annular oil groove 801 and a number of cross-distributed space oil guiding grooves 802 are provided on the bearing surface of the large head of the slider 8. A wear-resistant alloy layer is also sprayed on the surface of the large head of the slider 8.

[0080] Specifically, referring to Figure 3 As shown, the second axial oil through hole 201 completely penetrates through both ends of the crankshaft 2. A second joint 32 is provided at the left end of the crankshaft housing 1. The second joint 32 is used to communicate the left end of the second axial oil through hole 201 with the outlet of the second throttle valve 22. The right end of the second axial oil through hole 201 is blocked by a second sealing plug 31.

[0081] Specifically, referring to Figure 1As shown, an adaptive thermal throttle element 5 is provided in the second radial oil passage hole 202. The connection mode of the adaptive thermal throttle element 5 and the second radial oil passage hole 202 is interference fit or screw installation. The inner hole of the adaptive thermal throttle element 5 can expand or contract with temperature change. In this embodiment, the material of the adaptive thermal throttle element 5 is nitinol alloy.

[0082] Specifically, the material of the inner wall surface of the bearing shell 4 is aluminum-tin alloy, the material of the crankshaft 2 is high-strength alloy steel and its surface has a nitrided layer. Five crank throws 203 are arranged axially on the crankshaft 2 at intervals of 144°.

[0083] Refer to Figure 1 As shown, this embodiment also provides a high-pressure and extra-large flow plunger pump, which includes the above-mentioned high-power power end with adaptive lubrication. In addition, the high-pressure and extra-large flow plunger pump further includes a bracket 9, a plunger seal assembly 10, a valve body 11, a flow distribution valve assembly 12 and a liquid inlet tank. The bracket 9 is installed and fixed between the crankshaft housing 1 and the valve body 11 through stud bolts. The plunger seal assembly 10 is arranged on the bracket 9. The flow distribution valve assembly 12 is arranged inside the valve body 11. The liquid inlet tank is connected to the lower part of the valve body 11.

[0084] Among them, the liquid inlet tank can simultaneously serve as the cooling water tank 33 in the cooler assembly 13.

[0085] In this embodiment, the center distance between every two sliders 8 in the crankshaft housing 1 does not exceed 255 mm, and the weight of the whole high-pressure and extra-large flow plunger pump does not exceed 7.5 tons, so that the high-pressure and extra-large flow plunger pump has the characteristics of compact structure and light weight.

[0086] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An adaptive lubrication high-power power end, characterized in that, Comprising: A crankshaft housing (1), in which a slideway hole (103) is provided; A crankshaft mechanism arranged in the crankshaft housing (1), the crankshaft mechanism includes a crankshaft (2), a connecting rod (3), a bearing shell (4) and a slider (8), and a plurality of crank throws (203) are arranged along the axial direction of the crankshaft. One end of the connecting rod (3) is rotatably connected to the crank throw (203) through the bearing shell (4) to form a rotational friction pair, and the other end of the connecting rod (3) is slidably connected to the slideway hole (103) through the slider (8) to form a sliding friction pair; An adaptive lubrication and cooling system, the adaptive lubrication and cooling system includes a first lubrication branch communicated with the sliding friction pair and a second lubrication branch communicated with the rotational friction pair; Wherein, the first lubrication branch includes a first axial oil passage hole (101) provided on the crankshaft housing (1) and a first radial oil passage hole (102) communicated with the slideway hole (103), and the first radial oil passage hole (102) is communicated with the first axial oil passage hole (101); Wherein, the second lubrication branch includes a second axial oil passage hole (201) provided on the crankshaft (2) and second radial oil passage holes (202) respectively provided on each crank throw (203), and the second radial oil passage holes (202) are communicated with the second axial oil passage hole (201); The adaptive lubrication and cooling system further includes a gear pair (6) and an inner driving gear pump (16) driven by it, an outer driving motor (28) and an outer driving gear pump (29) driven by it, an integrated valve block (24), a cooler assembly (13), a filter (15), a first one-way valve (27), a second one-way valve (23); A three-way oil port (19) is provided on the crankshaft housing (1), the suction side of the inner driving gear pump (16) is connected to the first suction port (1901) of the three-way oil port (19) through a pipeline, and the suction side of the outer driving gear pump (29) is connected to the second suction port (1902) of the three-way oil port (19) through a pipeline; The integrated valve block (24) is provided with a first mounting hole (2403), a second mounting hole (2405), a first oil collecting port (2404) and a first main flow channel (2401). The first mounting hole (2403) is used for mounting the first one-way valve (27), the second mounting hole (2405) is used for mounting the second one-way valve (23), the pressure side of the inner driving gear pump (16) is communicated with the first one-way valve (27) through a pipeline, the pressure side of the outer driving gear pump (29) is communicated with the second one-way valve (23) through a pipeline, and the outlets of the first one-way valve (27) and the second one-way valve (23) converge to the first main flow channel (2401) inside the integrated valve block (24), and are sequentially communicated with the filter (15) and the cooler assembly (13) through the first oil collecting port (2404) and a pipeline; The integrated valve block (24) is provided with a third mounting hole (2406), a fourth mounting hole (2407), a second oil collecting port (2408) and a second main flow channel (2402). A first throttle valve (21) is mounted on the third mounting hole (2406), and a second throttle valve (22) is mounted on the fourth mounting hole (2407). The oil outlet interface (3404) of the cooler assembly (13) is connected to the second oil collecting port (2408) through a tubing, and is communicated with the inlets of the first throttle valve (21) and the second throttle valve (22) through the second main flow channel (2402). The outlet of the first throttle valve (21) is communicated with a first lubrication branch, and the outlet of the second throttle valve (22) is communicated with a second lubrication branch. An overflow valve (25) is further provided on the integrated valve block (24). The liquid inlet of the overflow valve (25) is communicated with the first main flow channel (2401). A first pressure gauge (26) is provided on the first main flow channel (2401). The liquid return port of the overflow valve (25) is communicated with the crankcase (1) through the integrated valve block (24). The first axial oil passage hole (101) completely penetrates through both ends of the crankcase (1). A first joint (20) is provided at the left end of the crankcase (1). The first joint (20) is used to communicate the left end of the first axial oil passage hole (101) with the outlet of the first throttle valve (21). The right end of the first axial oil passage hole (101) is blocked by a first sealing plug (30). A throttle plug (7) is provided in the first radial oil passage hole (102). The upper end of the throttle plug (7) has an external thread and is connected to the internal thread at the upper end of the first radial oil passage hole (102). The lower part of the throttle plug (7) has a cylindrical step, and a first damping hole (701) and a number of uniformly arranged second damping holes (702) are provided in the cylindrical step. A ring-shaped oil groove (801) and a number of cross-distributed space oil guiding grooves (802) are provided on the bearing surface of the big end of the slider (8). A wear-resistant alloy layer is also sprayed on the surface of the big end of the slider (8). The second axial oil passage hole (201) completely penetrates through both ends of the crankshaft (2). A second joint (32) is provided at the left end of the crankcase (1). The second joint (32) is used to communicate the left end of the second axial oil passage hole (201) with the outlet of the second throttle valve (22). The right end of the second axial oil passage hole (201) is blocked by a second sealing plug (31). An adaptive thermal throttle element (5) is provided in the second radial oil passage hole (202). The connection mode of the adaptive thermal throttle element (5) and the second radial oil passage hole (202) is interference fit or threaded installation. The inner hole of the adaptive thermal throttle element (5) can expand or contract with temperature change.

2. The high-power power end with adaptive lubrication according to claim 1, wherein A second pressure gauge (18) is provided between the first throttle valve (21) and the first lubrication branch, and a third pressure gauge (17) is provided between the second throttle valve (22) and the second lubrication branch.

3. An adaptive lubrication high-power power end according to claim 1, characterized in that, The cooler assembly (13) includes a cooling water tank (33). Two groups of cooling pipe assemblies (14) are arranged in the cooling water tank (33). The cooling pipe assembly (14) includes a plurality of hollow copper pipes (1402). First flanges (1401) and second flanges (1403) are arranged at both ends of the hollow copper pipe (1402). A first radial sealing groove (1404) is arranged on the first flange (1401). A second radial sealing groove (1405) is arranged on the second flange (1403). The first radial sealing groove (1404) and the second radial sealing groove (1405) are used for arranging annular sealing rings. The second flange (1403) is further provided with a first step (1406). The first step (1406) is connected to the liquid inlet tank by screws.

4. An adaptive lubrication high-power power end according to claim 3, characterized in that The cooling water tank (33) further includes an oil inlet flange (34), a liquid inlet blanking cover (35), a liquid inlet joint (36) and an oil inlet blanking cover (37). The liquid inlet joint (36) is used for communicating with the liquid supply pipeline of the plunger pump. An oil inlet interface (3403) and an oil outlet interface (3404) are arranged on the outer side of the oil inlet flange (34). A first annular sealing groove (3401) and a second annular sealing groove (3402) are arranged on the inner side of the oil inlet flange (34). A third annular sealing groove (3701) and a fourth annular sealing groove (3702) are arranged on the oil inlet blanking cover (37). The first annular sealing groove (3401), the second annular sealing groove (3402), the third annular sealing groove (3701) and the fourth annular sealing groove (3702) are all used for arranging annular sealing rings. A first groove (3705) and a second groove (3703) are further arranged on the oil inlet blanking cover (37). An oil through groove (3704) is arranged between the first groove (3705) and the second groove (3703).

5. A high-pressure and ultra-large-flow plunger pump, characterized in that, Including the high-power power end with adaptive lubrication according to any one of claims 1-4, the high-pressure and extra-large flow plunger pump further includes a bracket (9), a plunger seal assembly (10), a valve body (11), a flow distribution valve assembly (12) and a liquid inlet tank. The bracket (9) is installed and fixed between the crankshaft housing (1) and the valve body (11) through stud bolts. The plunger seal assembly (10) is arranged on the bracket (9). The flow distribution valve assembly (12) is arranged inside the valve body (11). The liquid inlet tank is connected to the lower part of the valve body (11).

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