An axial piston pump with good self-priming performance

Abstract

The present disclosure relates to the technical field of plunger pump, and provides an axial plunger pump with good self-priming performance, which comprises a pump shell assembly, a base, a distribution disc, a swash plate and a cylinder body, the base is provided with a medium input channel and a medium output channel, the distribution disc is provided with a first through groove and a second through groove, the cylinder body is provided with a plurality of plunger holes, a sliding plunger is slidingly arranged in the plunger hole, and the sliding plunger is used for pumping medium from the medium input channel to the medium output channel after sliding; the wear-resistant ring is provided with a plurality of sliding parts and friction parts, the sliding parts are slidingly arranged in the plunger holes one by one, the sliding direction of the sliding part is parallel to the sliding direction of the sliding plunger, after the sliding part slides, the friction part is driven by the sliding part to abut against the top of the distribution disc away from one end of the sliding part, the sliding part is provided with a third through hole in communication with the plunger hole, and the friction part is provided with a plurality of distribution windows in one-to-one communication with the third through hole. Through the above technical scheme, the technical problem that the distribution disc needs to be frequently overhauled and replaced in the prior art is solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of plunger pump, in particular, to an axial plunger pump with good self-priming performance. BACKGROUND

[0002] The axial plunger pump is a hydraulic power device that realizes liquid delivery through the reciprocating movement of the plunger in the cylinder. Its core feature is that the plunger axis is parallel to the transmission shaft, and it has the advantages of high pressure, high efficiency, compact structure, etc., and is widely used in industrial, engineering machinery, aerospace and other fields. Axial plunger pumps are divided into swash plate type and inclined shaft type, and the swash plate type axial plunger pump is further divided into bidirectional variable swash plate type plunger pump and unidirectional variable swash plate type plunger pump. The operator can realize flexible control of pumping direction or flow by changing the angle of the swash plate.

[0003] The swash plate type plunger pump is configured with rotating cylinder and rotating sealing of the distribution disc. During the operation of the plunger pump, wear will always occur between the cylinder and the distribution disc. When the wear of the distribution disc reaches a certain amount, the delivery medium of the plunger pump will flow out from the gap between the cylinder and the distribution disc, reducing the pumping efficiency of the plunger pump. In the prior art, the wear of the distribution disc needs to be checked regularly. When the wear reaches 0.05mm or more, the distribution disc needs to be replaced in time. In the case of high pressure delivery, the inspection period and service life of the distribution disc will be further shortened. SUMMARY

[0004] To overcome the above-mentioned defects, embodiments of the present disclosure provide an axial plunger pump with good self-priming performance, which solves the technical problem of frequent maintenance and replacement of the distribution disc in the prior art.

[0005] According to one aspect, at least one embodiment of the present disclosure provides an axial plunger pump with good self-priming performance, comprising a pump housing assembly, a base, a distribution disc, a swash plate and a cylinder, the cylinder is rotatably arranged in the pump housing assembly, the base has a medium input channel and a medium output channel, the distribution disc has a first through slot and a second through slot respectively communicating with the medium input channel and the medium output channel, the cylinder has a plurality of plunger holes, and further comprising:

[0006] a sliding plunger, which is slidingly arranged in the plunger hole, one end of the sliding plunger always abuts against the swash plate, and the sliding plunger is used to pump the medium from the medium input channel to the medium output channel after sliding;

[0007] The wear-resistant ring has a friction part and a plurality of sliding parts, the sliding parts are one-to-one slidingly arranged in the plunger hole, the sliding direction of the sliding parts is parallel to the sliding direction of the sliding plunger, the wear-resistant ring can be pushed towards the distribution plate so that the bottom of the friction part always abuts against the top of the distribution plate, the sliding part has a third through hole in communication with the plunger hole, the friction part has a plurality of distribution windows, the distribution windows are in one-to-one communication with the third through hole, and the distribution windows are in communication with the first through groove or the second through groove.

[0008] For example, the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure further comprises:

[0009] The first elastic member is used for elastically pushing the friction part to abut against the top of the distribution plate.

[0010] For example, in the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure, the outer wall of the sliding part slidingly and sealingly abuts against the inner wall of the plunger hole.

[0011] For example, in the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure, the swash plate is rotationally arranged relative to the pump shell assembly, the swash plate changes the stroke and pumping direction of the sliding plunger after rotation, the rotation axis of the swash plate is located on the symmetry plane of the medium input channel and the medium output channel, and the axial plunger pump further comprises a variable adjustment assembly, the variable adjustment assembly comprises:

[0012] The rotating shaft is rotationally arranged on the pump shell assembly, one end of the rotating shaft is arranged on the swash plate, and the other end of the rotating shaft penetrates through the pump shell assembly, and the rotating shaft is used to drive the swash plate to rotate.

[0013] The second fixed ring is arranged on the pump shell assembly, the rotating shaft penetrates through the second fixed ring, the second fixed ring has a threaded hole, the threaded hole is used for threaded connection with a jacking bolt, and the jacking bolt is used to tighten or loosen the rotating shaft.

[0014] For example, in the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure, the distribution plate further has an unloading groove located between the first through groove and the second through groove, and the axial plunger pump further comprises:

[0015] The distribution box is located outside the pump shell assembly, and the distribution box has a containing space in communication with the unloading groove.

[0016] For example, in the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure, the height of the distribution box is greater than the height of the distribution plate.

[0017] For example, in the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure, the unloading groove has two arc-shaped portions and an annular portion, the two arc-shaped portions are respectively located in the interval of the circumferential extension direction of the first through groove and the second through groove, and the two arc-shaped portions are used for communicating with the flow distribution window and are communicated with each other through the annular portion.

[0018] For example, in the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure, the included angle formed between the two ends of the arc-shaped portion and the rotation center of the cylinder body is not less than the included angle formed between the two ends of the flow distribution window and the rotation center of the cylinder body.

[0019] For example, in the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure, the flow distribution disc further comprises:

[0020] The partition plate has two arc-shaped portions, and the two arc-shaped portions are respectively arranged in the two arc-shaped portions, and the partition plate is used for dividing the arc-shaped portion into a first segment and a second segment, the first segments of the two arc-shaped portions are communicated with each other through the annular portion, and the second segments of the two arc-shaped portions are communicated with each other through the annular portion.

[0021] For example, in the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure, the flow distribution box has two, and the two flow distribution boxes are respectively communicated with the first segment and the second segment.

[0022] The embodiments of the present disclosure have the following beneficial effects:

[0023] In the present disclosure, by additionally arranging the wear-resistant ring between the cylinder body and the flow distribution disc, the wear of the cylinder body is dispersed to the friction portion of the wear-resistant ring, so that the wear of the cylinder body is avoided or the probability that the cylinder body is scratched by impurities is avoided. Due to the relative sliding between the sliding portion of the wear-resistant ring and the plunger hole, the sliding adjustment can be adaptively adjusted according to the wear amount of the wear-resistant ring or the flow distribution disc, so that the friction portion always maintains good contact with the flow distribution disc, the possibility of medium leakage is reduced, the wear amount of the flow distribution disc is reduced, the frequency of maintenance and replacement of the flow distribution disc is reduced, and the working efficiency is improved.

[0024] Through actual test, under the same working condition, the replacement frequency and maintenance cycle of the flow distribution disc can be prolonged by 2-3 times. Through the sliding compensation wear amount of the wear-resistant ring, the leakage of the medium from the gap between the cylinder body and the flow distribution disc is reduced, so that more medium can be effectively pumped, the volumetric efficiency of the pump is improved, and the overall pumping efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments of the present disclosure will be briefly introduced. Obviously, the drawings in the following description are only some example embodiments of the present disclosure. For those skilled in the art, other drawings can also be obtained according to the contents of the example embodiments of the present disclosure and the drawings without any creative effort.

[0026] Figure 1 The first angle structure schematic diagram of the present disclosure;

[0027] Figure 2 The second angle structure schematic diagram of the present disclosure;

[0028] Figure 3 The cross-sectional structure schematic diagram of the present disclosure;

[0029] Figure 4 The Figure 3 The enlarged structure schematic diagram at A in the figure;

[0030] Figure 5 The front view of the flow distribution disc;

[0031] Figure 6 The rear view of the flow distribution disc;

[0032] Figure 7 The principle diagram of the positional relationship between the flow distribution disc and the flow distribution window in a certain state;

[0033] In the figure: 100, pump shell assembly, 200, base, 300, flow distribution disc, 400, swash plate, 500, cylinder body, 210, medium input channel, 220, medium output channel, 310, first through slot, 320, second through slot, 510, plunger hole, 600, sliding plunger, 700, wear-resistant ring, 710, friction part, 720, sliding part, 721, third through hole, 711, flow distribution window, 800, drive shaft, 810, first fixed ring, 790, first elastic member, 900, variable adjustment assembly, 910, rotating shaft, 920, second fixed ring, 921, threaded hole, 922, jacking bolt, 330, unloading groove, 340, flow distribution box, 341, containing space, 331, arc part, 332, annular part, 350, partition plate, 3311, first section, 3312, second section. DETAILED DESCRIPTION

[0034] The present disclosure will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the present disclosure, but not to limit the present disclosure.

[0035] For the purpose of clarity, only the parts of the apparatus that are pertinent to the disclosure have been shown in the drawings, and they do not necessarily represent the actual size or shape of the product. In addition, in some of the drawings, parts having the same structure or function are denoted by the same reference numerals, and only one of them is shown schematically for the sake of clarity. In this document, "one" does not necessarily mean "only one", but can mean "more than one", and "several" includes "two" and "more than two".

[0036] In this document, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0037] In the present disclosure, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. "Under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0038] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0039] In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] As Figures 1-4As shown, it shows a self-priming axial plunger pump with good performance in an embodiment of the present disclosure, comprising a pump shell assembly 100, a base 200, a flow distribution disc 300, a swash plate 400 and a cylinder body 500, the pump shell assembly 100 plays a role in protecting the internal components. The base 200 is bolted with the pump shell assembly 100, which provides stable support for the pump shell assembly 100, the flow distribution disc 300, the cylinder body 500, the swash plate 400 and other components, and is provided with a medium input channel 210 and a medium output channel 220, the medium input channel 210 is in communication with the storage space of the medium to be pumped, and the medium output channel 220 is used for the output of the pressurized medium. The flow distribution disc 300 is located below the cylinder body 500, and the flow distribution disc 300 is provided with a first through slot 310 and a second through slot 320, which are respectively connected with the medium input channel 210 and the medium output channel 220 of the base 200, so as to realize the reasonable distribution of the medium in the pump. The cylinder body 500 is in the shape of a cylinder, and a plurality of plunger holes 510 are uniformly distributed inside the cylinder body 500. These plunger holes 510 extend along the axial direction of the cylinder body 500.

[0041] The sliding plunger 600 can make reciprocating sliding motion in the plunger hole 510. The sliding plunger 600 is made of high-strength and wear-resistant metal material, such as alloy steel, to ensure that it is not easily damaged under high pressure and high-frequency reciprocating motion. The sliding plunger 600 and the plunger hole 510 have high-precision fit, which ensures that the pressure in the plunger hole 510 can change with the sliding of the sliding plunger 600.

[0042] The wear-resistant ring 700 has a plurality of sliding parts 720 and friction parts 710. The number of sliding parts 720 is the same as the number of plunger holes 510 on the cylinder body 500, and is correspondingly arranged in the plunger hole 510. The sliding direction of the sliding part 720 is parallel to the sliding direction of the sliding plunger 600, which ensures the stability of the sliding of the sliding part 720. The sliding part 720 is provided with a third through hole 721 communicating with the plunger hole 510, which provides a channel for the medium to enter or leave the plunger hole 510. The friction part 710 is connected to one end of the sliding part 720, and the end of the friction part 710 away from the sliding part 720 is in close abutment with the top of the flow distribution disc 300. The friction part 710 also adopts excellent wear-resistant materials such as ceramic matrix composites to cope with long-term friction with the flow distribution disc 300. The friction part 710 is provided with a plurality of flow distribution windows 711, which are in one-to-one correspondence with the third through holes 721 on the sliding part 720.

[0043] In actual use, when the axial piston pump starts to work, the cylinder body 500 rotates under the action of the driving device (such as a motor through a transmission shaft). Due to the inclination of the swash plate 400, and the fact that one end of the sliding piston 600 is always in contact with the swash plate through the sliding shoe, the sliding piston 600 makes reciprocating sliding movement in the piston hole 510. When the sliding piston 600 slides away from the direction of the distribution plate 300, the volume in the piston hole 510 increases, the pressure decreases, and a pressure difference is formed between the medium input channel 210 and the piston hole 510, so that the medium enters the piston hole 510 from the medium input channel 210 of the base 200, through the first through groove 310, and then through the distribution window 711 of the friction part 710 of the wear-resistant ring 700 and the third through hole 721 of the sliding part 720 in sequence. At this time, the friction part 710 of the wear-resistant ring 700 is in close contact with the distribution plate 300, preventing leakage of the medium.

[0044] When the sliding piston 600 slides towards the direction of the distribution plate 300, the medium in the piston hole 510 is compressed, and the pressure rises. At this time, the medium enters the distribution window 711 of the friction part 710 of the wear-resistant ring 700 through the third through hole 721, and then flows to the medium output channel 220 of the base 200 through the second through groove 320 of the distribution plate 300, completing the pumping process of the medium.

[0045] In the entire process, the sliding part 720 of the wear-resistant ring 700 slides in the piston hole 510 along with the movement of the sliding piston 600, and because the wear-resistant ring 700 is added, the friction part 710 is always in close contact with the distribution plate 300. Even when the distribution plate 300 or the wear-resistant ring 700 is worn to a certain extent, the friction part 710 of the wear-resistant ring 700 can continue to maintain good sealing performance through the sliding adjustment of the sliding part 720, thereby reducing the outflow of the medium from the gap between the cylinder body 500 and the distribution plate 300.

[0046] The conventional swash plate 400 type piston pump is prone to wear of the distribution plate 300 due to direct contact and long-term relative movement between the cylinder body 500 and the distribution plate 300, which affects the pumping efficiency. The present design disperses the wear of the cylinder body 500 to the friction part 710 of the wear-resistant ring 700 by adding the wear-resistant ring 700 between the cylinder body 500 and the distribution plate 300. Due to the relative sliding between the sliding part 720 of the wear-resistant ring 700 and the piston hole 510, the wear-resistant ring 700 or the distribution plate 300 can be adaptively adjusted in sliding, so that the friction part 710 is always in good contact with the distribution plate 300, reducing the possibility of medium leakage, reducing the wear of the distribution plate 300, reducing the frequency of maintenance and replacement of the distribution plate 300, and improving the work efficiency.

[0047] Through actual tests, under the same working conditions, the replacement frequency and maintenance cycle of the flow distribution disc 300 can be extended by 2-3 times. As the leakage of the medium from the gap between the cylinder body 500 and the flow distribution disc 300 is reduced, more medium can be effectively pumped, the volumetric efficiency of the pump is improved, and the overall pumping efficiency is improved.

[0048] In some examples, the axial plunger pump with good self-priming performance provided by at least one embodiment of the present disclosure further comprises a drive shaft 800, the drive shaft 800 penetrating through the pump housing assembly 100, the drive shaft 800 being connected with the rotary driving device and driving the cylinder body 500 to rotate through the spline. A first fixed ring 810 is arranged on the drive shaft 800, the first fixed ring 810 being firmly fixed on the drive shaft 800 through key connection or interference fit, etc., to ensure that relative rotation or axial movement does not occur during pump operation. The first elastic member 790 is selected from a high-strength spring, such as a spiral compression spring, and the two ends thereof are in contact with the first fixed ring 810 and the wear-resistant ring 700, respectively. The elastic force of the first elastic member 790 can continuously and stably act to elastically push the wear-resistant ring 700 towards the flow distribution disc 300.

[0049] During the entire working process, the wear-resistant ring 700 is always in good contact with the flow distribution disc 300 under the action of the first elastic member 790. Even if the flow distribution disc 300 is worn to a certain extent, the first elastic member 790 can compensate for the gap generated due to wear through elastic deformation, thereby maintaining the sealing performance.

[0050] In some examples, the outer wall of the sliding part 720 and the inner wall of the plunger hole 510 realize sliding sealing abutment, which greatly improves the sealing performance of the pump. The sliding part 720 is made of a special self-lubricating wear-resistant material, such as a polyether ether ketone composite material added with molybdenum disulfide, which not only has excellent wear resistance, but also can effectively reduce the friction coefficient during sliding, thereby reducing energy loss. Rubber can be added to the side wall of the sliding part 720 close to the sliding plunger 600, which can increase the sealing performance of the outer wall of the sliding part 720 and the inside of the plunger hole 510 through deformation.

[0051] In some examples, the swashplate 400 is rotatably configured relative to the pump housing assembly 100, with its axis of rotation located on the plane of symmetry between the medium input channel 210 and the medium output channel 220. This allows the swashplate 400 to change the stroke and pumping direction of the sliding plunger 600 by rotation, while the boundary point between the rising and falling sections of the sliding plunger 600 within the plunger bore 510 remains unchanged. For example, when the swashplate 400 tilts to one side at a greater angle, the reciprocating stroke of the sliding plunger 600 within the plunger bore 510 becomes longer, and the pumping flow rate increases accordingly; conversely, when the tilt angle decreases, the stroke shortens, and the flow rate decreases. Simultaneously, by changing the tilt direction of the swashplate 400, the pumping direction can be reversed to meet the needs of different operating scenarios. The rotation adjustment assembly includes a rotating shaft 910, which is rotatably mounted on the pump housing assembly 100. One end of the shaft is securely connected to the swashplate 400, and the other end extends through the pump housing assembly 100 to the outside. When the rotating shaft 910 rotates under external force, it drives the swashplate 400 to rotate synchronously, thereby adjusting the stroke and pumping direction of the sliding plunger 600. A second retaining ring 920 is mounted on the pump housing assembly 100, through which the rotating shaft 910 passes. The second retaining ring 920 has a threaded hole 921, which matches the tightening bolt 922, achieving a tight connection through the thread. When it is necessary to adjust the angle of the swashplate 400, the tightening bolt 922 is loosened, allowing the rotating shaft 910 to rotate freely, thus changing the angle of the swashplate 400. After adjustment, the tightening bolt 922 is tightened to press against the rotating shaft 910, thereby fixing the angle of the swashplate 400 and ensuring that the swashplate 400 will not change angle due to vibration or external interference during operation, thus guaranteeing stable pump operation.

[0052] By setting the variable adjustment component 900, precise control of the rotation angle of the swashplate 400 is achieved, thereby flexibly adjusting the stroke and pumping direction of the sliding plunger 600 to meet the requirements of pumping flow rate and direction under different working conditions. This design enables the axial plunger pump to adaptively adjust according to actual working conditions, improving the pump's versatility and working efficiency. Simultaneously, the sealing design of the wear ring 700, the first elastic element 790, and the inner wall of the sliding part 720 and the plunger bore 510 effectively solves the problems of wear on the distribution plate 300 and media leakage, enhancing the pump's self-priming performance and overall reliability.

[0053] It should be further explained that the swashplate 400 and the cylinder block 500 are connected by a ball joint, and the device is equipped with a return assembly. The return assembly is used to assist the plunger in sliding away from the distribution plate 300, thereby drawing the medium from the medium input channel 210. Since the specific structure can be achieved by conventional means, it will not be described in detail here.

[0054] like Figures 5-7As shown, in some examples, the unloading groove 330 is arranged on the flow distribution disc 300 and located between the first through groove 310 and the second through groove 320. Its main function is to avoid the phenomenon of oil being trapped when the plunger hole 510 transitions from the oil suction area to the oil compression area or from the oil compression area to the oil suction area during the operation of the plunger pump, and the impact and noise caused by the pressure jump can be effectively reduced through the unloading groove 330. For example, when the plunger hole 510 leaves the oil suction area and enters the dead volume, the medium in the unloading groove 330 can enter the plunger hole 510 under the action of the pressure difference, thereby avoiding the gradual decrease of the overlapping area of the medium input channel 210 and the flow distribution window 711, which causes the axial force on the sliding plunger 600 to increase. Moreover, the unloading groove 330 is in communication with the flow distribution box 340, which can be filled with the delivery medium in advance, thereby avoiding the entry of gas into the plunger hole 510 and the vibration and noise phenomenon caused by the gradual decrease of the overlapping area of the medium input channel 210 and the flow distribution window 711, which causes the pressure to rise.

[0055] The flow distribution box 340 is located outside the pump housing assembly 100 and has an accommodation space 341 inside, which contains the same medium as the plunger pump. The accommodation space 341 is in communication with the unloading groove 330 of the flow distribution disc 300. The flow distribution box 340 functions to collect and regulate the medium flowing out of the unloading groove 330. On the one hand, it can store the excess medium flowing out of the unloading groove 330 to prevent the pressure fluctuation caused by the disordered flow of the medium in the pump; on the other hand, it can ensure that the unloading groove 330 is always filled with medium to avoid the entry of air.

[0056] Compared with the unloading groove 330 in the transmission plunger pump, the unloading groove 330 is divided into two parts: one part is in communication with the medium input channel 210 from the oil inlet area to the oil compression area, and the other part is in communication with the outside from the oil compression area to the oil inlet area. When the pumping direction is changed by changing the inclination angle of the swash plate 400, the device needs to be disassembled and the position of the oil distribution disc needs to be changed. In this device, the unloading groove 330 is in communication with the external flow distribution box 340, which can adapt to the change of the pumping direction without disassembling the plunger pump.

[0057] In some examples, the height of the flow distribution box 340 is greater than that of the flow distribution disc 300.

[0058] When the plunger hole 510 enters the oil compression area from the oil suction area, the liquid in the unloading groove 330 needs to compensate part of the medium for the pressure difference between the unloading groove 330 and the plunger hole 510, and the height of the flow distribution box 340 is greater than that of the flow distribution disc 300, which can automatically supplement the medium into the unloading groove 330 under the action of gravity. When the plunger hole 510 enters the oil suction area from the oil compression area, part of the medium in the plunger hole 510 will be discharged into the unloading groove 330.

[0059] In some examples, the unloading groove 330 on the flow distribution disc 300 is composed of two arc-shaped sections 331 and an annular section 332. The two arc-shaped sections 331 are located between the two ends of the first through groove 310 and the second through groove 320, and are connected to each other through the annular section 332.

[0060] The two arc-shaped sections 331 are located on the path of the flow distribution window 711, and the annular section 332 is located at the bottom of the friction section 710, and the annular section 332 and the bottom of the friction section 710 form a closed space to prevent the medium in the annular section 332 from leaking. On the other hand, the annular section 332 reduces the contact area between the flow distribution disc 300 and the friction section 710, so that the hard friction area between the friction section 710 and the flow distribution ring becomes soft friction between the media.

[0061] In some examples, the included angle between the two ends of the arc-shaped section 331 and the center of rotation of the cylinder body 500 is not less than the included angle between the two ends of the flow distribution window 711 and the center of rotation of the cylinder body 500.

[0062] Because the included angle of the arc-shaped section 331 is large, on the one hand, it can minimize the area of the dead volume and avoid the influence of the dead volume on the plunger pump, and on the other hand, it can prevent the flow distribution window 711 from connecting the medium input channel 210 and the medium output channel 220, thereby causing the plunger pump to fail.

[0063] In some examples, the flow distribution disc 300 further comprises a partition plate 350, the partition plate 350 has two arc-shaped sections 331 respectively arranged in the two arc-shaped sections 331, and the partition plate 350 is used to divide the arc-shaped section 331 into a first section 3311 and a second section 3312. The first sections 3311 of the two arc-shaped sections 331 are connected to each other through the annular section 332, and the second sections 3312 of the two arc-shaped sections 331 are connected to each other through the annular section 332.

[0064] By arranging the partition plate 350 in the arc-shaped section 331 of the unloading groove 330, the arc-shaped section 331 is divided into two sections, and the connection between the two sections is realized through the annular section 332, which further optimizes the pressure regulation function of the unloading groove 330. When the two plunger holes 510 are respectively located at the two ends of an arc-shaped section, the two plunger holes 510 are connected to the medium input channel 210 and the medium output channel 220 through the unloading groove 330.

[0065] In some examples, the flow distribution box 340 has two, and the two flow distribution boxes 340 are respectively connected to the first section 3311 and the second section 3312.

[0066] Two flow distribution boxes 340 are respectively communicated with the first section 3311 and the second section 3312 of the unloading groove 330, realizing the precise segmented adjustment of the pressure of the unloading groove 330. In the working process of the plunger pump, the pressure fluctuation can be more effectively buffered and balanced, compared with the design of a single flow distribution box 340, the pressure stability is improved, it is ensured that the pump can stably run under different working conditions, and the unstable pressure caused by the fact that the two plunger holes 510 are simultaneously located at both ends of an arc-shaped part 331 is reduced.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than limit the present disclosure. Although the present disclosure is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present disclosure can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present disclosure, and they should be covered in the scope of the claims of the present disclosure.

Claims

1. An axial piston pump with good self-priming performance, comprising a pump housing assembly (100), a base (200), a valve plate (300), a swash plate (400) and a cylinder block (500), the cylinder block (500) is rotatably arranged in the pump housing assembly (100), the base (200) has a medium input channel (210) and a medium output channel (220), the valve plate (300) has a first through slot (310) and a second through slot (320) respectively communicating with the medium input channel (210) and the medium output channel (220), the cylinder block (500) has a plurality of piston holes (510), characterized in that, Also comprising: a sliding plunger (600) slidingly arranged in the plunger hole (510), one end of the sliding plunger (600) always abutting against the swash plate (400), the sliding plunger (600) being used to pump medium from the medium input channel (210) to the medium output channel (220) after sliding; a wear ring (700) comprising a friction part (710) and a plurality of sliding parts (720), the sliding parts (720) being slidingly arranged in the plunger hole (510) one by one, the sliding direction of the sliding parts (720) being parallel to the sliding direction of the sliding plunger (600), the wear ring (700) being able to be pushed towards the distribution plate (300) so that the bottom of the friction part (710) always abuts against the top of the distribution plate (300), the sliding parts (720) having third through holes (721) in communication with the plunger hole (510), the friction part (710) having a plurality of distribution windows (711) in one-to-one communication with the third through holes (721), the distribution windows (711) being in communication with the first through groove (310) or the second through groove (320); a drive shaft (800) penetrating through the pump housing assembly (100), the drive shaft (800) being in transmission connection with a rotary driving device, the drive shaft (800) being provided with a first fixed ring (810); a first elastic member (790) acting on the first fixed ring (810) and the wear ring (700) at two ends respectively, the first elastic member (790) being used to elastically push the friction part (710) to abut against the top of the distribution plate (300).

2. The axial piston pump with good self-priming performance according to claim 1, characterized in that The outer wall of the sliding part (720) and the inner wall of the plunger hole (510) are in sliding sealing sliding cooperation.

3. The axial piston pump with good self-priming performance according to claim 1, characterized in that, The distribution plate (300) further has an unloading groove (330) located between the first through groove (310) and the second through groove (320), and further comprising: a distribution box (340) located outside the pump housing assembly (100), the distribution box (340) having a containing space (341) in communication with the unloading groove (330).

4. The axial piston pump with good self-priming performance according to claim 3, characterized in that The height of the distribution box (340) is greater than the height of the distribution plate (300).

5. The axial piston pump of good self-priming performance according to claim 3, characterized in that, The unloading groove (330) has two arc-shaped parts (331) and an annular part (332) symmetrically arranged and used to communicate the two arc-shaped parts (331), the two arc-shaped parts (331) being located between the adjacent ends of the first through groove (310) and the second through groove (320) respectively, the two arc-shaped parts (331) being used to communicate with the distribution windows (711), the two arc-shaped parts (331) being in mutual communication through the annular part (332).

6. The axial piston pump with good self-priming performance according to claim 5, characterized in that The included angle formed between the two ends of the arc-shaped part (331) and the rotation center of the cylinder body (500) is not less than the included angle formed between the two ends of the distribution window (711) and the rotation center of the cylinder body (500).

7. The axial piston pump with good self-priming performance according to claim 5, characterized in that The distribution plate (300) further comprises: The partition plate (350) is arranged in the two arc-shaped portions (331) respectively, and is used for dividing the arc-shaped portions (331) into first sections (3311) and second sections (3312). The first sections (3311) of the two arc-shaped portions (331) are communicated with each other through the annular portion (332), and the second sections (3312) of the two arc-shaped portions (331) are communicated with each other through the annular portion (332).

8. The axial piston pump with good self-priming performance according to claim 7, characterized in that The flow distribution box (340) has two, and the two flow distribution boxes (340) are communicated with the first sections (3311) and the second sections (3312) one by one.

9. The axial piston pump with good self-priming performance according to any one of claims 1-8, characterized in that, The swash plate (400) is arranged to rotate relative to the pump shell assembly (100), and the swash plate (400) changes the stroke and pumping direction of the sliding plunger (600) after rotation. The rotation axis of the swash plate (400) is located on the symmetry plane of the medium input channel (210) and the medium output channel (220). The variable adjusting assembly (900) further comprises: A rotating shaft (910) is arranged to rotate on the pump shell assembly (100). One end of the rotating shaft (910) is arranged on the swash plate (400), and the other end penetrates the pump shell assembly (100). The rotating shaft (910) is used to drive the swash plate (400) to rotate. A second fixed ring (920) is arranged on the pump shell assembly (100). The rotating shaft (910) penetrates the second fixed ring (920). The second fixed ring (920) has a threaded hole (921). The threaded hole (921) is used to be screwed with a jacking bolt (922). The jacking bolt (922) is used to tighten or loosen the rotating shaft (910).

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