Plunger pump power structure

Abstract

The present application relates to power structure technical field, especially a kind of plunger pump power structure, comprising: pump body, overall is columnar, pump body is provided with the working chamber of axial direction, the radial direction of pump body is provided with multiple slideway holes of communicating working chamber;Plunger, slidingly set in slideway hole, elastic member is arranged between pump body and plunger, to provide elastic force towards working chamber to plunger;Transmission shaft, rotation is set in working chamber, transmission shaft is provided with even number of eccentric discs, each eccentric disc is respectively corresponding with the axial position of one or more slideway holes, each eccentric disc is correspondingly provided with one eccentric disc on rotating shaft, and the installation direction of the eccentric disc is opposite.This scheme is used to solve the defects that vibration is large when high speed running in the prior art, it is difficult to realize high flow, realize the power structure of cam roller radial plunger pump with dynamic balance, compact structure and large working flow.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power structure, and particularly relates to a plunger pump power structure. BACKGROUND

[0002] As an important fluid conveying device, the plunger pump has been widely used in many fields such as petroleum, chemical industry, and mechanical manufacturing. It realizes the suction and discharge of liquid through the reciprocating movement of the plunger in the pump body, and has the advantages of simple structure, high efficiency, and wide pressure range. However, during high-speed operation, the traditional plunger pump is prone to generate large vibration and noise due to the interaction between the cam and the plunger and the reciprocating movement of the plunger itself, which not only affects the service life of the pump, but also limits the improvement of the working flow.

[0003] Especially in the application scenarios with high flow demand, the shortcomings of the traditional plunger pump are more obvious. In order to overcome these problems, researchers and engineers continue to explore new design schemes and technical means to improve the performance of the plunger pump. For example, using damping materials, optimizing cam curve design, and increasing auxiliary support structure, although it can alleviate the vibration problem to some extent, it cannot fundamentally solve the vibration problem under high flow. SUMMARY

[0004] The present application provides a plunger pump power structure to solve the defects of large vibration during high-speed operation and difficulty in achieving high flow in the prior art, and realizes a dynamically balanced, compactly structured, and high-flow cam roller radial plunger pump power structure.

[0005] The present application provides a plunger pump power structure, comprising: a pump body, which is generally cylindrical, the pump body is provided with a working cavity in the axial direction, and the pump body is provided with a plurality of slide hole holes communicating with the working cavity in the radial direction; a plunger, which is slidably arranged in the slide hole hole, an elastic member is arranged between the pump body and the plunger to provide an elastic force to the plunger towards the working cavity; a transmission shaft, which is rotatably arranged in the working cavity, and the transmission shaft is provided with an even number of eccentric discs, each of the eccentric discs corresponds to the axial position of one or more slide hole holes, and each of the eccentric discs is provided with an eccentric disc with opposite installation direction on the rotating shaft.

[0006] According to one embodiment of the present application, half of the eccentric discs on the transmission shaft are installed towards the first direction, and the other half of the eccentric discs are installed towards the second direction, and the relative angle between the first direction and the second direction is 180 degrees.

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

[0008] According to one embodiment of the present application, the eccentric disc is sleeved on the transmission shaft, and a limiting key is arranged between the eccentric disc and the transmission shaft; a key groove corresponding to the limiting key is arranged in the inner hole of the eccentric disc and the surface of the transmission shaft, so as to limit the installation angle of the eccentric disc by the limiting key.

[0009] According to one embodiment of the present application, the distribution of the slide holes on the pump body matches the distribution of the eccentric discs on the transmission shaft; when any one of the eccentric discs acts on one plunger, the eccentric disc opposite to the installation direction thereof synchronously acts on another plunger.

[0010] According to one embodiment of the present application, the plunger is provided with a sliding block assembly slidingly matched with the slide hole; the sliding block assembly comprises a sliding block body, the top of which is provided with a pressing plate structure corresponding to the shape of the end of the plunger, so as to fix the sliding block body to the plunger; the sliding block assembly comprises a mounting pin and a roller, the sliding block body is provided with a C-shaped notch with an opening facing away from the plunger, the mounting pin passes through the side wall of the C-shaped notch and the center hole of the roller, and a sliding bearing is arranged between the mounting pin and the roller, so that the roller is rotatably mounted in the C-shaped notch; at least a part of the roller protrudes from the C-shaped notch, and is used for contacting the eccentric disc.

[0011] According to one embodiment of the present application, the working chamber is provided with a first end cover and a second end cover at the two ends in the axial direction, respectively; the first end cover is sealingly arranged at the bottom of the working chamber, and the second end cover is sealingly arranged 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 cavity around the transmission shaft, which stores lubricating oil.

[0012] According to one embodiment of the present application, a sealing sleeve is arranged at the outer opening of the slide hole, the inner side surface of the sealing sleeve is sealingly slidingly matched with the plunger; a slide oil cavity is formed between the sealing sleeve and the sliding block assembly; the pump body is provided with an oil inlet hole communicating with the slide oil cavity.

[0013] According to one embodiment of the present application, the outer peripheral surface of the sliding block body is provided with a first oil storage groove surrounding the sliding block body; the top of the sliding block body is provided with an oil passing hole communicating between the slide oil cavity and the first oil storage groove.

[0014] According to one embodiment of the present application, the outer circumferential surface of the slider body is provided with a second oil storage groove surrounding the slider body, the second oil storage groove is arranged in a spaced manner with the first oil storage groove; a connecting groove is arranged 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 lubricating hole communicating with the inside of the C-shaped notch, 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 lubricating hole.

[0015] The plunger pump power structure provided by the application comprises a transmission shaft, a plurality of eccentric discs arranged on the transmission shaft, a plurality of sliding grooves arranged on the transmission shaft, a plurality of plungers arranged on the transmission shaft, and a plurality of sliders arranged on the transmission shaft. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0017] Figure 1 FIG. 1 is a cross-sectional structure schematic diagram of the plunger pump power structure provided by the application.

[0018] Figure 2 FIG. 2 is a structure schematic diagram of the pump body of the plunger pump power structure provided by the application.

[0019] Figure 3 FIG. 3 is a structure schematic diagram of the transmission shaft of the plunger pump power structure provided by the application.

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

[0021] Figure 5 FIG. 5 is a structure schematic diagram of the slider assembly of the plunger pump power structure provided by the application.

[0022] Reference signs:

[0023] 10, pump body; 11, working chamber; 12, slide hole; 13, first end cover; 14, second end cover; 15, lubricating oil chamber; 16, sealing sleeve; 17, oil inlet hole; 20, plunger; 21, slide block body; 22, pressing plate structure; 23, mounting pin; 24, roller; 25, sliding bearing; 26, slide oil chamber; 27, first oil storage groove; 271, oil passing hole; 28, second oil storage groove; 281, connecting groove; 282, internal lubricating hole; 30, transmission shaft; 31, eccentric disc; 32, bearing part; 33, annular spacer; 34, limiting hoop; 35, limiting key. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described below in connection with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0025] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms “first”, “second”, “third” are only for the purpose of description, and cannot be understood as indicating or implying relative importance. It should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms “arrange”, “mount”, “connect” should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0026] The specific embodiments of the plunger pump power structure of the present application will be described below in connection with Figures 1 to 5

[0027] As Figure 1 , Figure 2 and Figure 3 ​As shown, the present application provides a plunger pump power structure, including a pump body 10, a plunger 20, and a transmission shaft 30. The pump body 10 is generally cylindrical, and is provided with an axial working chamber 11. The pump body 10 is provided with a plurality of slide holes 12 in the radial direction, which communicate with the working chamber 11. The plunger 20 is slidingly arranged in the slide hole 12. An elastic member (not shown in the figure) is arranged between the pump body 10 and the plunger 20 to provide an elastic force to the plunger 20 towards the working chamber 11. The transmission shaft 30 is rotatably arranged in the working chamber 11, and is provided with an even number of eccentric discs 31. Each eccentric disc 31 corresponds to the axial position of one or more slide holes 12, and each eccentric disc 31 is correspondingly provided with an eccentric disc 31 with opposite installation direction on the rotation axis.

[0028] When the transmission shaft 30 rotates, the eccentric disc 31 rotates with the transmission shaft 30. Each eccentric disc 31 periodically pushes the corresponding plunger 20 during rotation, causing the plunger 20 to reciprocate in the slide hole 12. The reciprocating motion of the plunger 20 is transmitted to the outside through a connecting mechanism (such as a piston rod), thereby achieving multi-row action output. Each eccentric disc 31 is correspondingly provided with an eccentric disc 31 with opposite installation direction on the rotation axis. This symmetrical design not only ensures that the centrifugal forces generated by each eccentric disc 31 cancel each other out during rotation of the transmission shaft 30, achieving dynamic balance of the transmission shaft 30, but also synchronizes and coordinates the reciprocating motion of multiple plungers 20, further improving the overall balance and stability of the pump.

[0029] Specifically, the pump body 10 is provided with a plurality of slide holes 12 in the radial direction, and each slide hole 12 is slidingly arranged with a plunger 20, so that multiple plungers 20 can work simultaneously, improving the flow rate and working efficiency of the pump. By arranging an even number of eccentric discs 31 on the transmission shaft 30, and each eccentric disc 31 being correspondingly provided with an eccentric disc 31 with opposite installation direction on the transmission shaft 30, the dynamic balance of the transmission shaft 30 during rotation is achieved. The coordinated motion of the symmetrically arranged eccentric discs 31 and plungers 20 together ensures that the entire system remains stable during operation, reducing vibration and noise and prolonging the service life of the equipment. The pump body 10 is generally cylindrical, with a compact internal structure. The design of multiple slide holes 12 and plungers 20 makes the pump relatively small in size, facilitating installation and maintenance. The symmetric arrangement of the eccentric discs 31 on the transmission shaft 30 further optimizes space utilization, making the entire pump body 10 structure more compact.

[0030] It can be understood that the eccentric discs 31 can be installed in various orientations according to requirements, as long as each eccentric disc 31 has a corresponding eccentric disc 31 installed in the opposite direction. Preferably, according to a plunger pump power structure of the present application, half of the eccentric discs 31 on the transmission shaft 30 are installed in a first direction, and the other half of the eccentric discs 31 are installed in a second direction, and the relative angle between the first direction and the second direction is 180 degrees. Specifically, on the transmission shaft 30, half of the number of eccentric discs 31 are installed in a certain direction (referred to as "first direction"), and the other half of the number of eccentric discs 31 are installed in the opposite direction of the first direction (referred to as "second direction"). Here, "opposite" means that the relative angle between the second direction and the first direction is 180 degrees. Since the eccentric discs 31 appear in pairs, the installation direction of each pair of eccentric discs 31 is opposite, so that the centrifugal forces generated when they rotate will cancel each other out. Through symmetrical design, the vibration of the transmission shaft 30 when rotating at high speed can be significantly reduced, thereby improving the stability of the pump and reducing noise.

[0031] According to a plunger pump power structure of the present application, the front end and the rear end of the transmission shaft 30 are respectively provided with bearing members 32 between the inner wall of the working chamber 11, to support the transmission shaft 30 and reduce friction, and to ensure the smoothness and stability of the transmission shaft 30 when rotating. The eccentric discs 31 are all arranged between the two bearing members 32, and between adjacent eccentric discs 31, the transmission shaft 30 is provided with an annular pad 33 to ensure the spacing between adjacent eccentric discs 31, prevent the eccentric discs 31 from colliding or rubbing during rotation, and ensure that the reciprocating motion of the plunger 20 is more stable and coordinated. Near the outer side of the eccentric disc 31 close to the bearing member 32, the transmission shaft 30 is provided with a limiting hoop 34 for limiting the position of the eccentric disc 31, to prevent the eccentric disc 31 from sliding in the axial direction during rotation, and to further improve the stability and reliability of the transmission shaft 30.

[0032] According to the plunger pump power structure of the present application, the eccentric disc 31 is sleeved on the transmission shaft 30, and a limiting key 35 is arranged between the eccentric disc 31 and the transmission shaft 30. A key groove corresponding to the limiting key 35 is arranged in the inner hole of the eccentric disc 31 and the surface of the transmission shaft 30, so as to limit the installation angle of the eccentric disc 31. Specifically, the design of the limiting key 35 and the key groove ensures the accurate installation and fixation of the eccentric disc 31 on the transmission shaft 30. The limiting key 35 is usually an elongated metal piece, one end of which is installed on the transmission shaft 30, and the other end of which is embedded in the key groove in the inner hole of the eccentric disc 31. The shape and size of the key groove are matched with the limiting key 35, so as to ensure that the eccentric disc 31 can only be positioned at a predetermined angle during installation. Through the key matching mode, the angle deviation of the eccentric disc 31 during rotation is prevented, and the installation angles of all the eccentric discs 31 are ensured to be consistent, so as to realize the high synchronism and coordination of the plunger pump during operation. In addition, the cooperation of the limiting key 35 and the key groove also simplifies the assembly process, reduces the failure and maintenance cost caused by improper installation.

[0033] According to the plunger pump power structure of the present application, the distribution of the slide hole 12 on the pump body 10 is matched with the distribution of the eccentric disc 31 on the transmission shaft 30. When any one of the eccentric discs 31 acts on one plunger 20, the eccentric disc 31 in the opposite direction thereof synchronously acts on another plunger 20. 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 disc 31 on the transmission shaft 30 are matched correspondingly, so that when one eccentric disc 31 pushes one plunger 20, the eccentric disc 31 in the opposite direction thereof simultaneously pushes 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 disc 31, reduces the vibration and noise of the pump body 10, but also ensures that the reciprocating movements of all the plungers 20 are uniform and coordinated, thereby improving the overall stability and working efficiency of the pump.

[0034] As shown in Figure 1 , Figure 4 and Figure 5 , according to the plunger pump power structure of the present application, the plunger 20 is provided with a sliding block assembly which is in sliding cooperation with the slide hole 12. The sliding block assembly includes a sliding block body 21, the top of which is provided with a pressing plate structure 22 which is matched with the shape of the end of the plunger 20, so as to fix the sliding block body 21 to the plunger 20. The sliding block assembly includes a mounting pin 23 and a roller 24. The sliding block body 21 is provided with a C-shaped notch with an opening facing away from 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, and a sliding bearing 25 is arranged between the mounting pin 23 and the roller 24, so that the roller 24 is rotatably installed in the C-shaped notch. At least a part of the roller 24 protrudes from the C-shaped notch, and is used to contact the eccentric disc 31.

[0035] Specifically, the slider body 21 is fixedly connected with the end of the plunger 20 through the top pressing plate structure 22, ensuring the 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, and the sliding bearing 25 is arranged between the mounting pin 23 and the roller 24, so that the roller 24 can rotate freely in the C-shaped notch, and a part of the roller 24 protrudes from the C-shaped notch and directly contacts the eccentric disc 31, ensuring that the eccentric disc 31 can smoothly push the plunger 20 during rotation. Through the above-mentioned slider assembly, not only the friction and wear are reduced, the operation efficiency and service life of the pump are improved, but also the movement of the plunger 20 in the slide hole 12 is more stable and accurate, avoiding movement deviation caused by friction, and improving the overall performance and reliability of the plunger pump.

[0036] According to the plunger pump power structure of the application, the axial direction of the working cavity 11 is provided with a first end cover 13 and a second end cover 14 at both ends, respectively. The first end cover 13 is sealingly arranged at the bottom of the working cavity 11, and the second end cover 14 is sealingly arranged between the opening of the working cavity 11 and the transmission shaft 30. The first end cover 13, the second end cover 14 and the working cavity 11 form a lubricating oil cavity 15 around the transmission shaft 30, which stores lubricating oil. Specifically, the lubricating oil cavity 15 is used to ensure that the transmission shaft 30 and its related components are fully lubricated during operation, reducing friction and wear. The sealing arrangement of the first end cover 13 and the second end cover 14 prevents leakage while maintaining the cleanliness of the working cavity 11. The formation of the lubricating oil cavity 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 32 and other moving parts, reducing friction and heat generation during operation, and ensuring the stability and reliability of the pump.

[0037] The lubricating oil does not usually fill the entire lubricating oil cavity 15. Since the radial plunger pump is usually arranged horizontally (the axis of the transmission shaft 30 is parallel to the ground), this will result in the slider assembly above the lubricating oil level not being lubricated. Therefore, preferably, according to the plunger pump power structure of the application, a sealing sleeve 16 is arranged at the outer opening of the slide hole 12, and the inner side of the sealing sleeve 16 is in sealing sliding cooperation with the plunger 20; a slide oil cavity 26 is formed between the sealing sleeve 16 and the slider assembly; the pump body 10 is provided with an oil inlet hole 17 communicating with the slide oil cavity 26. Specifically, the arrangement of the sealing sleeve 16 not only prevents the lubricating oil from leaking from the outer opening of the slide hole 12, but also forms a closed slide oil cavity 26. Lubricating oil is injected into the slide oil cavity 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 the horizontally arranged radial plunger pump, reduces friction and wear, improves the operation efficiency and service life of the pump, and maintains the stability and reliability of the system.

[0038] According to the plunger pump power structure, the outer circumferential surface of the slider body 21 is provided with a first oil storage groove 27 surrounding the slider body 21; and the top of the slider body 21 is provided with an oil passing hole 271 connecting the oil channel oil cavity 26 and the first oil storage groove 27. Specifically, the first oil storage groove 27 provided on the outer circumferential surface of the slider body 21 can store lubricating oil, and the lubricating oil in the oil channel oil cavity 26 can flow smoothly into the first oil storage groove 27 through the oil passing hole 271 on the top of the slider body 21, ensuring that there is sufficient supply of lubricating oil during the movement of the slider assembly. At the same time, the design of the first oil storage groove 27 and the oil passing hole 271 makes the lubrication more uniform and persistent, further improving the stability and reliability of the plunger pump and prolonging the service life of the equipment.

[0039] Further, according to the plunger pump power structure, the outer circumferential 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 in a spaced manner with 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; and the second oil storage groove 28 is provided with an internal lubricating hole 282 communicating with the inside of the C-shaped notch, so that 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 lubricating 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 oil channel oil cavity 26 enters the first oil storage groove 27 through the oil passing hole 271, and then flows to the second oil storage groove 28 through the connecting groove 281, ensuring that each part of the outer circumferential 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 lubricating hole 282, ensuring that these key components are also fully lubricated during movement, reducing friction and wear, and improving the operating efficiency and life of the pump. This multi-level lubrication system not only improves the uniformity and persistence of the lubrication of the slider assembly, but also further enhances the stability and reliability of the plunger pump, prolonging the service life of the equipment.

[0040] Further, according to the plunger pump of the above-mentioned embodiment, the outer circumferential surface of the slider body 21 can be provided with a plurality of second oil storage grooves 28, which are arranged at intervals and cover a larger lubricating area, ensuring that the slider assembly can be sufficiently lubricated at different positions. A connecting groove 281 is arranged 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 more uniform distribution of the lubricating oil. In addition, the inside of the mounting pin 23 and the inside of the side wall of the C-shaped notch can be provided with a lubricating oil flow channel, allowing the lubricating oil to flow smoothly to the sliding bearing 25 located on the inside, further improving the lubricating effect of the sliding bearing 25 and reducing friction and wear. Through the design of multiple-stage oil storage grooves and internal lubricating oil flow channels, not only the uniformity and durability of the lubrication of the slider assembly are improved, but also the stability and reliability of the plunger pump are further enhanced, prolonging the service life of the equipment.

[0041] According to the plunger pump power structure of the preferred embodiment of the present application, as shown in Figure 1 is a radial plunger pump power structure cross-sectional view, the transmission shaft 30 and the pump body 10 are coaxially arranged, the plunger 20 and the slider assembly are radially installed in the slide hole 12 of the pump body 10, and the roller 24 of the slider assembly is in contact with the eccentric disc 31 of the transmission shaft 30 under the action of the spring force (spring not shown), the axis of the roller 24 is parallel to the axis of the transmission shaft 30. In addition, the pump body 10 is also provided with a sealing sleeve 16 for sealing the plunger 20, and the lower part of the sealing sleeve 16, the slide hole 12 and the slider assembly form a relatively closed space (not completely closed because there is a gap between the slider and the slide hole 12). The inside of the pump body 10, the left end cover and the right end cover form a closed lubricating oil cavity 15, and the lubricating oil cavity 15 contains lubricating oil, which is used to lubricate the moving parts.

[0042] As shown in Figure 2The oblique view of the pump body 10 is shown, wherein the pump body 10 is designed with a plurality of oil inlet holes 17 on the end face of one side, the axes of the oil inlet holes 17 are parallel to the axis of the transmission shaft 30, and the plunger pump is working, the lubricating oil in the pump body 10 is pumped out by an external oil pump, enters the oil inlet holes 17 after being cooled by a cooler, and the number of the oil inlet holes 17 depends on how many slider assemblies are above the lubricating oil level, the oil inlet holes 17 penetrate through two sliding channels, and the lubricating oil entering from the oil inlet holes 17 is finally stored in the lower part of the sealing sleeve 16, the sliding channel hole 12 and the slider assembly form a relatively closed space. When the transmission shaft 30 rotates, the eccentric disc 31 lifts the slider assembly upward, the volume of the relatively closed space becomes smaller, and then the oil liquid is compressed to enter the oil storage groove and the connecting groove 281 through the oil passage 271, and the oil in the oil storage groove and the connecting groove 281 can lubricate the slider body 21 and the inner wall of the sliding channel hole 12. Under the continuous compression of the sliding channel oil cavity 26, the lubricating oil enters the gap between the mounting pin 23 and the sliding bearing 25 through the internal lubricating hole 282 for lubrication.

[0043] As shown in 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 pads 33. The bearing members 32 are concentrically installed at both ends of the transmission shaft 30, the outer cylindrical surface and the inner cylindrical surface of the eccentric disc 31 are parallel but not coaxial, and the inner cylindrical surface of the eccentric disc 31 is coaxially installed with the axis of the transmission shaft 30. The preferred embodiment is a four-group eccentric disc 31 structure, wherein the installation angles of the two eccentric discs 31 at both ends are the same, the installation angles of the two eccentric discs 31 in the middle are the same, and the installation angles are different by 180 degrees.

[0044] Figure 4 And Figure 5 The slider assembly is limited by the pressing plate structure 22 with the plunger 20, the slider assembly and the plunger 20 are coaxially arranged, the slider body 21 is provided with a pin hole, the mounting pin 23 is fitted in the pin hole, the mounting pin 23 is provided with a lubricating oil flow channel, the slider body 21 is provided with an internal lubricating hole 282, and the internal lubricating hole 282 is in communication with the lubricating oil flow channel. The sliding bearing 25 is tightly fitted with the roller 24, and the sliding bearing 25 and the mounting pin 23 are gap-fitted and can slide relatively. The slider body 21 is also provided with an oil storage groove and a connecting groove 281. The lubricating oil flow channel in the mounting pin 23 can also be provided with an overflow valve structure, so that when the lubricating oil pressure is too high, the lubricating oil is released into the working cavity through the pin hole.

[0045] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "aspects", "specific aspects", or "some aspects" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or aspect are included in at least one embodiment or aspect of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or aspect. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or aspects. In addition, those skilled in the art can combine and combine the different embodiments or aspects described in the specification and the features of the different embodiments or aspects without contradiction, and the combination.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A power structure for a plunger pump, characterized by The utility model relates to a pump, comprising: a pump body in a column shape, the pump body is provided with a working cavity in axial direction, and a plurality of slide hole communicating with the working cavity are arranged on the pump body in radial direction; a plunger is arranged in the slide hole, and an elastic member is arranged between the pump body and the plunger to provide elastic force to the plunger towards the working cavity; a transmission shaft is arranged in the working cavity, and an even number of eccentric discs are arranged on the transmission shaft, each of the eccentric discs corresponds to the axial position of one or more slide holes, and each of the eccentric discs is provided with an eccentric disc with opposite installation direction on the transmission shaft; the plunger is provided with a slider assembly in sliding fit with the slide hole; the slider assembly comprises a slider main body provided with a C-shaped notch with an opening facing away from the plunger, an installation pin and a roller, the installation pin passes through the side wall of the C-shaped notch and the center hole of the roller, and a sliding bearing is arranged between the installation pin and the roller to rotatably install the roller in the C-shaped notch; a first oil storage groove is arranged on the outer circumferential surface of the slider main body around the slider main body; an oil passing hole is arranged on the top of the slider main body to communicate the slide oil cavity and the first oil storage groove; a second oil storage groove is arranged on the outer circumferential surface of the slider main body around the slider main body, and the second oil storage groove is arranged in space with the first oil storage groove; a connecting groove is arranged 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 lubricating hole communicating with the inside of the C-shaped notch, and the lubricating oil in the second oil storage groove can enter the gap between the installation pin and the sliding bearing through the internal lubricating hole.

2. The plunger pump power structure of claim 1, wherein, Half of the eccentric discs on the transmission shaft are installed towards a first direction, and the other half of the eccentric discs are installed towards a second direction, and the relative angle between the first direction and the second direction is 180 degrees.

3. The plunger pump power structure of claim 2, wherein, Bearing members are arranged between the inner wall of the working cavity and the front end and the rear end of the transmission shaft respectively; the eccentric discs are arranged between the two bearing members, and an annular pad is arranged on the transmission shaft between adjacent eccentric discs; limiting hoops are arranged on the transmission shaft outside the eccentric discs close to the bearing members to limit the position of the eccentric discs.

4. The plunger pump power structure of claim 2, wherein, The eccentric discs are sleeved on the transmission shaft, and limiting keys are arranged between the eccentric discs and the transmission shaft; key grooves corresponding to the limiting keys are arranged in the inner hole of the eccentric disc and the surface of the transmission shaft respectively to limit the installation angle of the eccentric disc through the limiting keys.

5. The plunger pump power structure of any one of claims 1 to 4, wherein, The distribution of the slide 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 with opposite installation direction synchronously acts on another plunger.

6. The plunger pump power structure of any one of claims 1 to 4, wherein, A pressing plate structure corresponding to the shape of the end of the plunger is arranged on the top of the slider main body to fix the slider main body to the plunger; At least a portion of the roller protrudes from the C-shaped notch for contacting the eccentric disc.

7. The plunger pump power structure of claim 6, wherein, The working cavity is provided with a first end cover and a second end cover at two ends in an axial direction, the first end cover is sealingly arranged at the bottom of the working cavity, and the second end cover is sealingly arranged between the opening of the working cavity and the transmission shaft. The first end cover, the second end cover and the working cavity form a lubricating oil cavity storing lubricating oil around the transmission shaft.

8. The plunger pump power structure of claim 7, wherein, A sealing sleeve is arranged at the outer opening of the slide hole, and the inner side surface of the sealing sleeve is sealingly and slidingly matched with the plunger; A slide oil cavity is formed between the sealing sleeve and the slide block assembly. The pump body is provided with an oil inlet hole communicating with the slide oil cavity.

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