Power structure of plunger pump

Abstract

The invention relates to the technical field of power structures, in particular to a plunger pump power structure which comprises a pump body, the whole pump body is columnar, the pump body is provided with a working cavity in the axial direction, and a plurality of slide way holes communicated with the working cavity are formed in the pump body in the radial direction; the plunger is arranged in the slide way hole in a sliding mode, and an elastic piece is arranged between the pump body and the plunger so as to provide elastic force towards the working cavity for the plunger; and the transmission shaft is rotationally arranged in the working cavity, an even number of eccentric discs are arranged on the transmission shaft, each eccentric disc corresponds to the axial position of one or more slide way holes, and each eccentric disc is correspondingly provided with an eccentric disc opposite to the mounting direction on the rotating shaft. According to the scheme, the defects that in the prior art, vibration is large during high-speed operation, and high flow is difficult to achieve are overcome, and the power structure of the cam roller radial plunger pump is dynamic in balance, compact in structure and large in working flow.

Description

Technical Field

[0001] The invention relates to the technical field of power structures, and in particular to a plunger pump power structure. Background Art

[0002] As an important fluid conveying equipment, plunger pumps have been widely used in many fields such as petroleum, chemical industry, and machinery manufacturing. It achieves the suction and discharge of liquid by the reciprocating motion of the plunger in the pump body, and has the advantages of simple structure, high efficiency, and wide pressure range. However, during the high-speed operation of traditional plunger pumps, due to the interaction between the cam and the plunger and the reciprocating motion of the plunger itself, it is easy to generate large vibrations and noises, which not only affects the service life of the pump, but also limits the improvement of its working flow rate.

[0003] Especially in the application scenarios with high flow demand, these shortcomings of traditional plunger pumps are more obvious. In order to overcome these problems, researchers and engineers are constantly exploring new design solutions and technical means to improve the performance of plunger pumps. For example, the use of vibration-damping materials, optimization of cam curve design, and the addition of auxiliary support structures can alleviate the vibration problem to a certain extent, but they have not fundamentally solved the vibration problem under high flow. Summary of the invention

[0004] The present invention provides a plunger pump power structure, which is used to solve the defects of large vibration and difficulty in achieving high flow rate during high-speed operation in the prior art, and realizes a cam roller radial plunger pump power structure with dynamic balance, compact structure and large working flow rate.

[0005] The present invention provides a plunger pump power structure, comprising: a pump body, which is columnar as a whole, and is provided with a working chamber in an axial direction, and a plurality of slideway holes connected to the working chamber are provided in the radial direction of the pump body; a plunger, which is slidably arranged in the slideway hole, and an elastic member is arranged between the pump body and the plunger to provide the plunger with an elastic force toward the working chamber; a transmission shaft, which is rotatably arranged in the working chamber, and an even number of eccentric disks are arranged on the transmission shaft, each of the eccentric disks corresponds to the axial position of one or more of the slideway holes, and each of the eccentric disks is correspondingly provided with an eccentric disk with an opposite installation direction on the rotating shaft.

[0006] According to one embodiment of the present invention, half of the eccentric discs on the transmission shaft are installed toward a first direction, and the other half of the eccentric discs are installed toward a second direction, and the relative angle between the first direction and the second direction differs by 180 degrees.

[0007] According to one embodiment of the present invention, bearing members are respectively arranged between the front end and the rear end of the transmission shaft and the inner wall of the working chamber; the eccentric disks are arranged between two of the bearing members, and an annular gasket is arranged on the transmission shaft between adjacent eccentric disks; on the outer side of the eccentric disk close to the bearing member, the transmission shaft is provided with a limiting hoop for limiting the position of the eccentric disk.

[0008] According to one embodiment of the present invention, the eccentric disk is sleeved on the transmission shaft, and a limit key is arranged between the eccentric disk and the transmission shaft; key slots adapted to the limit key are respectively arranged in the inner hole of the eccentric disk and on the surface of the transmission shaft, so as to limit the installation angle of the eccentric disk by the limit key.

[0009] According to one embodiment of the present invention, the distribution of the slideway holes on the pump body matches the distribution of the eccentric disks on the transmission shaft; when any eccentric disk acts on a plunger, the eccentric disk in the opposite installation direction acts on another plunger synchronously.

[0010] According to one embodiment of the present invention, the plunger is provided with a slider assembly that slides with the slideway hole; the slider assembly includes a slider body, a top of which is provided with a pressure plate structure that is adapted to the end shape of the plunger, for fixing the slider body to the plunger; the slider assembly includes a mounting pin and a roller, the slider body is provided with a C-shaped slot with an opening facing away from the plunger, the mounting pin passes through the side wall of the C-shaped slot and the center hole of the roller, and a sliding bearing is provided between the mounting pin and the roller so that the roller can be rotatably installed in the C-shaped slot; at least a portion of the roller protrudes from the C-shaped slot for contacting the eccentric disk.

[0011] According to one embodiment of the present invention, a first end cover and a second end cover are respectively provided at both ends of the working chamber in the axial direction, the first end cover is sealed at the bottom of the working chamber, and the second end cover is sealed between the opening of the working chamber and the transmission shaft; the first end cover, the second end cover and the working chamber form a lubricating oil chamber containing lubricating oil around the transmission shaft.

[0012] According to one embodiment of the present invention, a sealing sleeve is provided at the outer opening of the slideway hole, and the inner side surface of the sealing sleeve is slidingly matched with the plunger seal; a slideway oil chamber is formed between the sealing sleeve and the slider assembly; and the pump body is provided with an oil inlet hole connected to the slideway oil chamber.

[0013] According to one embodiment of the present invention, the outer peripheral surface of the slider body is provided with a first oil storage groove surrounding the slider body; the top of the slider body is provided with an oil hole connecting the slideway oil cavity and the first oil storage groove.

[0014] According to one embodiment of the present invention, the outer peripheral surface of the slider body is provided with a second oil storage groove surrounding the slider body, and the second oil storage groove is spaced apart from the first oil storage groove; a connecting groove is provided between the second oil storage groove and the first oil storage groove to allow the lubricating oil to flow from the first oil storage groove to the second oil storage groove along the connecting groove; the second oil storage groove is provided with an internal lubrication hole connected to the inner side of the C-shaped groove, and the lubricating oil in the second oil storage groove can enter the gap between the mounting pin and the sliding bearing through the internal lubrication hole.

[0015] The plunger pump power structure provided by the present invention is provided with an even number of eccentric disks on the transmission shaft, each eccentric disk corresponds to the axial position of one or more slideway holes, and each eccentric disk is provided with an eccentric disk with an opposite installation direction on the transmission shaft, so that when any eccentric disk acts on a plunger, the eccentric disk with an opposite installation direction acts on another plunger at the same time, thereby achieving dynamic balance of the transmission shaft during rotation. In this way, the vibration during high-speed operation is effectively reduced, the working stability and reliability of the pump are improved, and a plunger pump structure with a compact structure and a large working flow is realized, solving the defects of large vibration and difficulty in achieving high flow during high-speed operation in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a cross-sectional structural schematic diagram of the plunger pump power structure provided by the present invention.

[0018] Figure 2 It is a structural schematic diagram of the pump body of the plunger pump power structure provided by the present invention.

[0019] Figure 3 It is a structural schematic diagram of the transmission shaft of the plunger pump power structure provided by the present invention.

[0020] Figure 4 It is a schematic cross-sectional structure diagram of a plunger and a slider assembly of a plunger pump power structure provided by the present invention.

[0021] Figure 5 It is a structural schematic diagram of a slider assembly of a plunger pump power structure provided by the present invention.

[0022] Reference numerals: 10. Pump body; 11. Working chamber; 12. Slideway hole; 13. First end cover; 14. Second end cover; 15. Lubricating oil chamber; 16. Sealing sleeve; 17. Oil inlet hole; 20. Plunger; 21. Slider body; 22. Pressure plate structure; 23. Mounting pin; 24. Roller; 25. Sliding bearing; 26. Slideway oil chamber; 27. First oil storage groove; 271. Oil hole; 28. Second oil storage groove; 281. Connecting groove; 282. Internal lubrication hole; 30. Transmission shaft; 31. Eccentric disk; 32. Bearing member; 33. Annular gasket; 34. Limit hoop; 35. Limit key. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] Combine the following Figures 1 to 5 A specific embodiment of the plunger pump power structure of the present invention is described.

[0026] like Figure 1 , Figure 2 and Figure 3As shown, the present invention provides a plunger pump power structure, including a pump body 10, a plunger 20, and a transmission shaft 30. The pump body 10 is cylindrical as a whole, and is provided with a working chamber 11 in an axial direction, and a plurality of slide holes 12 connecting the working chamber 11 are provided in the radial direction of the pump body 10. The plunger 20 is slidably arranged in the slide hole 12, and an elastic member (not shown in the figure) is arranged between the pump body 10 and the plunger 20 to provide the plunger 20 with an elastic force toward the working chamber 11. The transmission shaft 30 is rotatably arranged in the working chamber 11, and an even number of eccentric disks 31 are arranged on the transmission shaft 30, each eccentric disk 31 corresponds to the axial position of one or more slide holes 12, and each eccentric disk 31 is correspondingly provided with an eccentric disk 31 with an opposite installation direction on the rotating shaft.

[0027] When the transmission shaft 30 rotates, the eccentric disk 31 rotates with the transmission shaft 30. During the rotation process, each eccentric disk 31 will periodically push the corresponding plunger 20 to make it reciprocate in the slideway hole 12. The reciprocating motion of the plunger 20 is transmitted to the outside through a connecting mechanism (such as a piston rod), thereby realizing multi-row action output. Among them, each eccentric disk 31 is correspondingly provided with an eccentric disk 31 with an opposite installation direction on the rotating shaft. This symmetrical design not only ensures that the centrifugal forces generated by each eccentric disk 31 during the rotation of the transmission shaft 30 offset each other, thereby realizing the dynamic balance of the transmission shaft 30, but also makes the reciprocating motion of multiple plungers 20 synchronized and coordinated, further improving the overall balance and stability of the pump.

[0028] Specifically, a plurality of slide holes 12 are provided in the radial direction of the pump body 10, and a plunger 20 is slidably provided in each slide hole 12, so that a plurality of plungers 20 can work simultaneously, thereby improving the flow rate and working efficiency of the pump. By providing an even number of eccentric disks 31 on the transmission shaft 30, and each eccentric disk 31 is provided with an eccentric disk 31 with an opposite installation direction on the transmission shaft 30, the dynamic balance of the transmission shaft 30 during rotation is achieved. The coordinated movement of the symmetrically arranged eccentric disks 31 and the plunger 20 works together to keep the whole system stable during operation, reduce vibration and noise, and extend the service life of the equipment. The pump body 10 is columnar as a whole, with a compact internal structure. The design of the plurality of slide holes 12 and the plunger 20 makes the volume of the pump relatively small, which is convenient for installation and maintenance. The symmetrical arrangement of the eccentric disks 31 on the transmission shaft 30 further optimizes the space utilization and makes the structure of the whole pump body 10 more compact.

[0029] It is understandable that the eccentric disc 31 can be set to a variety of installation directions according to needs, as long as each eccentric disc 31 has an eccentric disc 31 corresponding to it installed in the opposite direction. Preferably, according to a plunger pump power structure of the present invention, half of the eccentric discs 31 on the transmission shaft 30 are installed in the first direction, and the other half of the eccentric discs 31 are installed in the second direction, and the relative angle between the first direction and the second direction differs by 180 degrees. Specifically, on the transmission shaft 30, half of the eccentric discs 31 are installed in a certain direction (called the "first direction"), and the other half of the eccentric discs 31 are installed in the direction opposite to the first direction (called the "second direction"). "Opposite" here means that the relative angle between the second direction and the first direction differs by 180 degrees. Since the eccentric discs 31 appear in pairs, each pair of eccentric discs 31 are installed in opposite directions, so the centrifugal forces generated by them during rotation will offset each other. The symmetrical design can significantly reduce the vibration of the transmission shaft 30 during high-speed rotation, thereby improving the stability of the pump and reducing noise.

[0030] According to a plunger pump power structure of the present invention, bearings 32 are provided between the front and rear ends of the transmission shaft 30 and the inner wall of the working chamber 11, respectively, to support the transmission shaft 30 and reduce friction, thereby ensuring the smoothness and stability of the transmission shaft 30 during rotation. The eccentric disks 31 are each provided between two bearings 32, and an annular pad 33 is provided on the transmission shaft 30 between adjacent eccentric disks 31 to ensure the spacing between adjacent eccentric disks 31, to prevent the eccentric disks 31 from colliding or rubbing during rotation, and to ensure that the reciprocating motion of the plunger 20 is more stable and coordinated. On the outer side of the eccentric disk 31 near the bearing 32, the transmission shaft 30 is provided with a limiting hoop 34 for limiting the position of the eccentric disk 31, to prevent the eccentric disk 31 from sliding axially during rotation, thereby further improving the stability and reliability of the transmission shaft 30.

[0031] According to a plunger pump power structure of the present invention, the eccentric disk 31 is sleeved on the transmission shaft 30, and a limit key 35 is arranged between the eccentric disk 31 and the transmission shaft 30; key slots adapted to the limit key 35 are respectively arranged on the inner hole of the eccentric disk 31 and the surface of the transmission shaft 30, so as to limit the installation angle of the eccentric disk 31 through the limit key 35. Specifically, the design of the limit key 35 and the key slot ensures the accurate installation and fixation of the eccentric disk 31 on the transmission shaft 30. The limit key 35 is usually an elongated metal part, one end of which is installed on the transmission shaft 30, and the other end is embedded in the key slot in the inner hole of the eccentric disk 31. The shape and size of the key slot match the limit key 35 to ensure that the eccentric disk 31 can only be positioned at a predetermined angle during installation. Through the key matching method, the eccentric disk 31 is prevented from angular deviation during rotation, and the installation angles of all eccentric disks 31 are ensured to be consistent, thereby achieving high synchronization and coordination of the plunger pump during operation. In addition, the cooperation between the limit key 35 and the keyway simplifies the assembly process and reduces failures and maintenance costs caused by improper installation.

[0032] According to a plunger pump power structure of the present invention, the distribution of the slide holes 12 on the pump body 10 matches the distribution of the eccentric disks 31 on the transmission shaft 30; when any eccentric disk 31 acts on a plunger 20, the eccentric disk 31 in the opposite direction of its installation acts on another plunger 20 synchronously. Specifically, this symmetrical design further ensures the dynamic balance and coordinated movement of the plunger pump during operation. The position and direction of each eccentric disk 31 on the transmission shaft 30 are matched accordingly, so that when one eccentric disk 31 pushes a plunger 20, another eccentric disk 31 in the opposite direction will simultaneously push another plunger 20. The movement directions of the two plungers 20 are opposite but synchronous, which not only offsets the centrifugal force generated by the eccentric disk 31 and reduces the vibration and noise of the pump body 10, but also ensures that the reciprocating motion of all plungers 20 is uniform and coordinated, thereby improving the overall stability and working efficiency of the pump.

[0033] like Figure 1 , Figure 4 and Figure 5 As shown, according to a plunger pump power structure of the present invention, the plunger 20 is provided with a slider assembly that slides with the slide hole 12; the slider assembly includes a slider body 21, a pressure plate structure 22 adapted to the end shape of the plunger 20 is provided on the top of the slider body 21, for fixing the slider body 21 to the plunger 20; the slider assembly includes a mounting pin 23 and a roller 24, the slider body 21 is provided with a C-shaped slot with an opening facing away from the plunger 20, the mounting pin 23 passes through the side wall of the C-shaped slot and the center hole of the roller 24, and a sliding bearing 25 is provided between the mounting pin 23 and the roller 24, so that the roller 24 can be rotatably installed in the C-shaped slot; at least a portion of the roller 24 protrudes from the C-shaped slot for contacting the eccentric disk 31.

[0034] Specifically, the slider body 21 is fixedly connected to the end of the plunger 20 through the pressure plate structure 22 at the top, ensuring a firm connection between the slider body 21 and the plunger 20. The mounting pin 23 passes through the side wall of the C-shaped notch and the center hole of the roller 24, positioning the roller 24 in the C-shaped notch. A sliding bearing 25 is provided between the mounting pin 23 and the roller 24, so that the roller 24 can rotate freely in the C-shaped notch. A part of the roller 24 protrudes from the C-shaped notch and directly contacts the eccentric disk 31, ensuring that the eccentric disk 31 can smoothly push the plunger 20 during rotation. Through the above-mentioned slider assembly, not only friction and wear are reduced, the operating efficiency and life of the pump are improved, but also the movement of the plunger 20 in the slideway hole 12 is made smoother and more precise, the movement deviation caused by friction is avoided, and the overall performance and reliability of the plunger pump are improved.

[0035] According to a plunger pump power structure of the present invention, a first end cover 13 and a second end cover 14 are respectively provided at both ends of the working chamber 11 in the axial direction, the first end cover 13 is sealed at the bottom of the working chamber 11, and the second end cover 14 is sealed between the opening of the working chamber 11 and the transmission shaft 30; the first end cover 13, the second end cover 14 and the working chamber 11 form a lubricating oil chamber 15 containing lubricating oil around the transmission shaft 30. Specifically, the lubricating oil chamber 15 is used to ensure that the transmission shaft 30 and its related components are fully lubricated during operation to reduce friction and wear. The sealing arrangement of the first end cover 13 and the second end cover 14 prevents leakage and keeps the working chamber 11 clean. The formation of the lubricating oil chamber 15 not only provides continuous lubrication for the transmission shaft 30, but also provides a good lubrication environment for the eccentric disc 31, the bearing member 32 and other moving parts, reduces friction and heat generation during operation, and ensures the stability and reliability of the pump.

[0036] Lubricating oil usually does not fill the entire lubricating oil chamber 15. Since radial piston pumps are mostly arranged horizontally (the axis of the transmission shaft 30 is parallel to the ground), this will cause the slider assembly above the lubricating oil level to not be lubricated. Therefore, in a preferred case, according to a piston pump power structure of the present invention, a sealing sleeve 16 is provided at the outer opening of the slideway hole 12, and the inner side of the sealing sleeve 16 is in sealing and sliding cooperation with the plunger 20; a slideway oil chamber 26 is formed between the sealing sleeve 16 and the slider assembly; and the pump body 10 is provided with an oil inlet hole 17 connected to the slideway oil chamber 26. Specifically, the provision of the sealing sleeve 16 not only prevents the lubricating oil from leaking from the outer opening of the slideway hole 12, but also forms a closed slideway oil chamber 26, and lubricating oil is injected into the slideway oil chamber 26 through the oil inlet hole 17 on the pump body 10, ensuring that the slider assembly is always in a lubricated state during movement. This local lubrication system effectively solves the problem of insufficient lubrication of the slider assembly in a horizontally arranged radial piston pump, reduces friction and wear, improves the operating efficiency and life of the pump, and maintains the stability and reliability of the system.

[0037] According to a plunger pump power structure of the present invention, the outer peripheral surface of the slider body 21 is provided with a first oil storage groove 27 surrounding the slider body 21; the top of the slider body 21 is provided with an oil through hole 271 connecting the slideway oil chamber 26 and the first oil storage groove 27. Specifically, the first oil storage groove 27 provided on the outer peripheral surface of the slider body 21 can store lubricating oil, and the lubricating oil in the slideway oil chamber 26 can smoothly flow into the first oil storage groove 27 through the oil through hole 271 on the top of the slider body 21, ensuring that the slider assembly always has sufficient lubricating oil supply during movement. At the same time, the design of the first oil storage groove 27 and the oil through hole 271 makes the lubrication more uniform and lasting, further improves the stability and reliability of the plunger pump, and extends the service life of the equipment.

[0038] Further, according to a plunger pump power structure of the present invention, the outer peripheral surface of the slider body 21 is provided with a second oil storage groove 28 surrounding the slider body 21, and the second oil storage groove 28 is arranged at a distance from the first oil storage groove 27; a connecting groove 281 is arranged between the second oil storage groove 28 and the first oil storage groove 27 to allow the lubricating oil to flow from the first oil storage groove 27 to the second oil storage groove 28 along the connecting groove 281; the second oil storage groove 28 is provided with an internal lubrication hole 282 connected to the inner side of the C-shaped notch, and the lubricating oil in the second oil storage groove 28 can enter the gap between the mounting pin 23 and the sliding bearing 25 through the internal lubrication hole 282. Specifically, the multi-stage oil storage groove and the connecting groove 281 further optimize the lubrication effect of the slider assembly. The lubricating oil in the slideway oil chamber 26 enters the first oil storage groove 27 through the oil hole 271, and then flows to the second oil storage groove 28 through the connecting groove 281, ensuring that all parts of the outer peripheral surface of the slider body 21 can be fully lubricated. The lubricating oil in the second oil storage groove 28 enters the gap between the mounting pin 23 and the sliding bearing 25 through the internal lubrication hole 282, ensuring that these key components are fully lubricated during the movement, reducing friction and wear, and improving the operating efficiency and life of the pump. This multi-level lubrication system not only improves the lubrication uniformity and durability of the slider assembly, but also further enhances the stability and reliability of the plunger pump and extends the service life of the equipment.

[0039] Further, according to the plunger pump of the above embodiment, a plurality of second oil storage grooves 28 can be provided on the outer peripheral surface of the slider body 21. These second oil storage grooves 28 are arranged at intervals and cover a larger lubrication area, ensuring that the slider assembly can obtain sufficient lubrication at different positions. A connecting groove 281 is provided between each second oil storage groove 28 and the first oil storage groove 27, allowing the lubricating oil to flow from the first oil storage groove 27 to each second oil storage groove 28 along the connecting groove 281, ensuring that the lubricating oil is more evenly distributed. In addition, a lubricating oil flow channel can be provided inside the mounting pin 23 and inside the side wall of the C-shaped notch, so that the lubricating oil can flow smoothly to the sliding bearing 25 located on the inside, further improving the lubrication effect of the sliding bearing 25, and reducing friction and wear. The design of the multi-stage oil storage groove and the internal lubricating oil flow channel not only improves the lubrication uniformity and durability of the slider assembly, but also further enhances the stability and reliability of the plunger pump, and extends the service life of the equipment.

[0040] According to the plunger pump power structure of the preferred embodiment of the present application, Figure 1 The figure shows a cross-sectional view of the power structure of a radial piston pump. The transmission shaft 30 and the pump body 10 are arranged coaxially. The plunger 20 and the slider assembly are radially installed in the slideway hole 12 of the pump body 10. The roller 24 of the slider assembly contacts the eccentric disk 31 of the transmission shaft 30 under the action of the spring force (the spring is not shown). The axis of the roller 24 is parallel to the axis of the transmission shaft 30. In addition, a sealing sleeve 16 is installed on the pump body 10 to seal the plunger 20. The lower part of the sealing sleeve 16, the slideway hole 12 and the slider assembly form a relatively closed space (because there is a gap between the slider and the slideway hole 12, it is not completely closed). The inside of the pump body 10, the left end cover and the right end cover form a closed lubricating oil chamber 15. The lubricating oil chamber 15 contains lubricating oil, which is used to lubricate the moving parts.

[0041] like Figure 2The figure shows an oblique view of the pump body 10, wherein the pump body 10 is designed with a plurality of oil inlet holes 17 on the end face of one side, and the axis of the oil inlet hole 17 is parallel to the axis of the transmission shaft 30. When the plunger pump is working, the oil is pumped from the lubricating oil chamber 15 in the pump body 10 by an external oil pump, and then enters from the oil inlet hole 17 after being cooled by the cooler. The number of oil inlet holes 17 depends on how many slider assemblies are above the lubricating oil level. The oil inlet hole 17 runs through two slideways, and the lubricating oil entering from the oil inlet hole 17 will eventually be stored in a relatively closed space formed by the lower part of the sealing sleeve 16, the slideway hole 12 and the slider assembly. When the transmission shaft 30 rotates, the eccentric disk 31 lifts the slider assembly to move upward, and the volume of the relatively closed space becomes smaller, and then the compressed oil enters from the oil hole 271 and fills the oil storage groove and the connecting groove 281. The oil in the oil storage groove and the connecting groove 281 can lubricate the slider body 21 and the inner wall of the slideway hole 12. Under the continuous compression of the slideway oil chamber 26, the lubricating oil will enter the gap between the mounting pin 23 and the sliding bearing 25 through the internal lubrication hole 282 for lubrication.

[0042] like Figure 3 The transmission shaft 30 is shown, which is provided with two bearing members 32, four eccentric discs 31 and a plurality of annular spacers 33. The bearing members 32 are concentrically mounted at both ends of the transmission shaft 30, the outer cylindrical surface and the inner cylindrical surface axis of the eccentric disc 31 are parallel but not coaxial, and the inner cylindrical surface of the eccentric disc 31 is coaxially mounted with the axis of the transmission shaft 30. This preferred embodiment is a structure of four sets of eccentric discs 31, wherein the two eccentric discs 31 at the two ends are installed at the same angle, and the two eccentric discs 31 in the middle are installed at the same angle, and the installation angles differ by 180 degrees.

[0043] Figure 4 and Figure 5 It is a slider assembly, and the slider assembly and the plunger 20 are limited by the pressure plate structure 22. The slider assembly and the plunger 20 are coaxially arranged. A pin hole is provided on the slider body 21, and the mounting pin 23 is installed in the pin hole. A lubricating oil flow channel is provided on the mounting pin 23. An internal lubricating hole 282 is provided on the slider body 21, and the internal lubricating hole 282 is connected to the lubricating oil flow channel. The sliding bearing 25 is installed with a tight fit with the roller 24, and the sliding bearing 25 and the mounting pin 23 are installed with a clearance fit, and relative sliding can occur. The slider body 21 is also provided with an oil storage groove and a connecting groove 281. Among them, the lubricating oil flow channel in the mounting pin 23 can also be provided with an overflow valve structure to release the lubricating oil into the working chamber through the pin hole when the lubricating oil pressure is too high.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plunger pump power structure, characterized in that: include: The pump body is cylindrical in shape as a whole, and is provided with a working chamber in the axial direction, and a plurality of slideway holes communicating with the working chamber are provided in the radial direction of the pump body; A plunger is slidably disposed in the slideway hole, and an elastic member is disposed between the pump body and the plunger to provide an elastic force to the plunger toward the working chamber; A transmission shaft is rotatably arranged in the working chamber, an even number of eccentric disks are arranged on the transmission shaft, each of the eccentric disks corresponds to the axial position of one or more of the slideway holes, and each of the eccentric disks is correspondingly arranged on the rotating shaft with an eccentric disk having an opposite installation direction.

2. The plunger pump power structure according to claim 1, characterized in that: Half of the eccentric discs on the transmission shaft are installed toward a first direction, and the other half of the eccentric discs are installed toward a second direction, and the relative angle between the first direction and the second direction differs by 180 degrees.

3. The plunger pump power structure according to claim 2, characterized in that: Bearings are provided between the front end and the rear end of the transmission shaft and the inner wall of the working chamber respectively; The eccentric disks are arranged between two bearing members, and an annular pad is arranged on the transmission shaft between adjacent eccentric disks; The transmission shaft is provided with a limiting hoop for limiting the position of the eccentric disk on the outer side of the eccentric disk close to the bearing component.

4. The plunger pump power structure according to claim 2, characterized in that: The eccentric disk is sleeved on the transmission shaft, and a limit key is arranged between the eccentric disk and the transmission shaft; Keyways adapted to the limit keys are respectively arranged on the inner hole of the eccentric disk and the surface of the transmission shaft, so as to limit the installation angle of the eccentric disk through the limit keys.

5. The plunger pump power structure according to any one of claims 1 to 4, characterized in that: The distribution of the slideway holes on the pump body matches the distribution of the eccentric discs on the transmission shaft; When any eccentric disc acts on one plunger, the eccentric disc installed in the opposite direction acts on the other plunger synchronously.

6. The plunger pump power structure according to any one of claims 1 to 4, characterized in that: The plunger is provided with a slider assembly that slidably cooperates with the slideway hole; The slider assembly includes a slider body, the top of which is provided with a pressure plate structure adapted to the shape of the end of the plunger, for fixing the slider body to the plunger; The slider assembly includes a mounting pin and a roller, the slider body is provided with a C-shaped slot with an opening facing away from the plunger, the mounting pin passes through the side wall of the C-shaped slot and the center hole of the roller, and a sliding bearing is provided between the mounting pin and the roller so that the roller can be rotatably mounted in the C-shaped slot; At least a portion of the roller protrudes from the C-shaped slot for contacting the eccentric disk.

7. The plunger pump power structure according to claim 6, characterized in that: A first end cover and a second end cover are respectively disposed at two ends of the working chamber in the axial direction, the first end cover is sealed at the bottom of the working chamber, and the second end cover is sealed between the opening of the working chamber and the transmission shaft; The first end cover, the second end cover and the working chamber form a lubricating oil chamber containing lubricating oil around the transmission shaft.

8. The plunger pump power structure according to claim 7, characterized in that: A sealing sleeve is provided at the outer opening of the slideway hole, and the inner side surface of the sealing sleeve is in sealing and sliding cooperation with the plunger; A slideway oil chamber is formed between the sealing sleeve and the slider assembly; The pump body is provided with an oil inlet hole communicating with the slideway oil cavity.

9. The plunger pump power structure according to claim 8, characterized in that: The outer peripheral surface of the slider body is provided with a first oil storage groove surrounding the slider body; An oil hole connecting the slideway oil chamber and the first oil storage groove is arranged on the top of the slider body.

10. The plunger pump power structure according to claim 9, characterized in that: The outer peripheral surface of the slider body is provided with a second oil storage groove surrounding the slider body, and the second oil storage groove is spaced apart from the first oil storage groove; A connecting groove is provided between the second oil storage groove and the first oil storage groove to allow lubricating oil to flow from the first oil storage groove to the second oil storage groove along the connecting groove; The second oil storage groove is provided with an internal lubrication hole communicating with the inner side of the C-shaped notch, and the lubricating oil in the second oil storage groove can enter into the gap between the mounting pin and the sliding bearing through the internal lubrication hole.

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