Axial plunger pump with good self-absorption performance

Abstract

The invention relates to the technical field of plunger pumps, and provides an axial plunger pump with good self-suction performance, the axial plunger pump comprises a pump shell assembly, a base, a valve plate, a swash plate and a cylinder body, the base is provided with a medium input channel and a medium output channel, the valve plate is provided with a first through groove and a second through groove, and the cylinder body is provided with a plurality of plunger holes; the sliding plunger is arranged in the plunger hole in a sliding mode, and the sliding plunger is used for pumping a 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 slidably arranged in the plunger holes in a one-to-one correspondence mode, the sliding direction of the sliding parts is parallel to the sliding direction of the sliding plungers, after the sliding parts slide, the sliding parts drive the ends, away from the sliding parts, of the friction parts to abut against the top of the valve plate, and the sliding parts are provided with third through holes communicated with the plunger holes; the friction part is provided with a plurality of flow distribution windows, and the flow distribution windows communicate with the third through holes in a one-to-one correspondence mode. By means of the technical scheme, the technical problem that in the prior art, a valve plate needs to be frequently overhauled and replaced is solved.

Description

Technical Field

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

[0002] Axial piston pump is a hydraulic power device that realizes liquid transportation through the reciprocating motion of the piston in the cylinder. Its core feature is that the axis of the piston is parallel to the transmission shaft. It has the advantages of high pressure, high efficiency, and compact structure. It is widely used in industries, engineering machinery, aerospace, etc. Axial piston pumps are divided into two types: swash plate type and swash axis type. Among them, swash plate axial piston pumps are further divided into two-way variable swash plate piston pumps and one-way variable swash plate piston pumps. The operator can flexibly control the pumping direction or flow rate by changing the angle of the swash plate.

[0003] The inclined plate type plunger pump is a rotating cylinder body and a rotary seal configuration of the distribution plate. During the operation of the plunger pump, wear will always occur between the cylinder body and the distribution plate. When the distribution plate wears to a certain extent, the delivery medium of the plunger pump will flow out from the gap between the cylinder body and the distribution plate, reducing the pumping efficiency of the plunger pump. In the prior art, it is usually necessary to regularly check the wear of the distribution plate. When the wear reaches more than 0.05mm, the distribution plate needs to be replaced in time. In the case of high-pressure transmission, the inspection cycle and service life of the distribution plate will be further shortened. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the embodiments of the present disclosure provide an axial piston pump with good self-priming performance, which solves the technical problem in the prior art that the distribution plate needs to be frequently repaired and replaced.

[0005] According to one aspect, at least one embodiment of the present disclosure provides an axial piston pump with good self-priming performance, including a pump housing assembly, a base, a valve plate, a swash plate and a cylinder body, wherein the cylinder body is rotatably arranged in the pump housing assembly, the base has a medium input channel and a medium output channel, the valve plate has a first through groove and a second through groove respectively connected to the medium input channel and the medium output channel, the cylinder body has a plurality of plunger holes, and further includes: A sliding plunger is slidably disposed in the plunger hole, one end of the sliding plunger is always in contact with the slant plate, and the sliding plunger is used to pump the medium from the medium input channel to the medium output channel after sliding; A wear-resistant ring having a friction portion and a plurality of sliding portions, wherein the sliding portions are slidably arranged in the plunger hole in a one-to-one manner, and the sliding direction of the sliding portion is parallel to the sliding direction of the sliding plunger. The wear-resistant ring can be pushed toward the distribution disk so that the bottom of the friction portion is always in contact with the top of the distribution disk. The sliding portion has a third through hole connected to the plunger hole, and the friction portion has a plurality of distribution windows, which are connected to the third through holes in a one-to-one manner, and the distribution window is connected to the first through groove or the second through groove.

[0006] For example, at least one embodiment of the present disclosure provides an axial piston pump with good self-priming performance, further comprising: The first elastic member has two ends acting on the first fixing ring and the cylinder body respectively, and the first elastic member is used for elastically pushing the friction part to abut against the top of the distribution plate.

[0007] For example, in an axial piston pump with good self-priming performance provided by at least one embodiment of the present disclosure, the outer wall of the sliding portion is in sliding sealing contact with the inner wall of the piston hole.

[0008] For example, in an axial piston pump with good self-priming performance provided by at least one embodiment of the present disclosure, the swash plate is rotatably arranged relative to the pump housing assembly, and the swash plate changes the sliding piston stroke and the pumping direction after rotation, and the rotation axis of the swash plate is located on the symmetric plane of the medium input channel and the medium output channel, and also includes a variable adjustment component, and the variable adjustment component includes: A rotating shaft, rotatably arranged on the pump housing assembly, one end of the rotating shaft being arranged on the swash plate, and the other end penetrating the pump housing assembly, the rotating shaft being used to drive the swash plate to rotate; The second fixing ring is arranged on the pump housing assembly. The rotating shaft passes through the second fixing ring. The second fixing ring has a threaded hole. The threaded hole is used for threaded connection with a tightening bolt. The tightening bolt is used to tighten or loosen the rotating shaft.

[0009] For example, in an axial piston pump with good self-priming performance provided by at least one embodiment of the present disclosure, the valve plate further has a relief groove, and the relief groove is located between the first through groove and the second through groove, and further includes: A flow distribution box is located outside the pump casing assembly, and the flow distribution box has a containing space, and the containing space is communicated with the unloading groove.

[0010] For example, in an axial piston 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.

[0011] For example, in an axial piston 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 between the first through groove and the second through groove in the circumferential extension direction, the two arc-shaped portions are used to communicate with the distribution window, and the two arc-shaped portions are connected to each other through the annular portion.

[0012] For example, in an axial piston pump with good self-priming performance provided by at least one embodiment of the present disclosure, the angle formed by the two ends of the arc portion and the rotation center of the cylinder body is not less than the angle formed by the two ends of the distribution window and the rotation center of the cylinder body.

[0013] For example, in an axial piston pump with good self-priming performance provided in at least one embodiment of the present disclosure, the valve plate further includes: The partition plate has two partition plates respectively arranged in the two arc-shaped parts, and the partition plates are used to divide the arc-shaped part into a first section and a second section. The first sections of the two arc-shaped parts are connected to each other through the annular part, and the second sections of the two arc-shaped parts are connected to each other through the annular part.

[0014] For example, in an axial piston pump with good self-priming performance provided by at least one embodiment of the present disclosure, there are two flow distribution boxes, and the two flow distribution boxes are respectively connected to the first section and the second section.

[0015] The beneficial effects of the embodiments of the present disclosure are: In the present disclosure, by adding a wear-resistant ring between the cylinder body and the distribution plate, the wear of the cylinder body is dispersed to the friction part of the wear-resistant ring, thereby avoiding the wear of the cylinder body or avoiding the probability of the cylinder body being scratched by impurities. Due to the relative sliding between the sliding part of the wear-resistant ring and the plunger hole, adaptive sliding adjustment can be performed following the wear amount of the wear-resistant ring or the distribution plate, so that the friction part always maintains a good contact state with the distribution plate, reducing the possibility of medium leakage, reducing the wear amount of the distribution plate, reducing the frequency of repairing and replacing the distribution plate, and improving work efficiency.

[0016] After actual testing, under the same working conditions, the replacement frequency and maintenance cycle of the valve plate can be extended by 2-3 times. The wear of the wear ring is compensated by sliding, which reduces the leakage of the medium from the gap between the cylinder body and the valve plate, allowing more medium to be effectively pumped, improving the volumetric efficiency of the pump, and thus improving the overall pumping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments of the present disclosure. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on the contents of the exemplary embodiments of the present disclosure and these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the structure from the first angle of the present disclosure; Figure 2 This is a schematic diagram of the structure from a second angle of the present disclosure; Figure 3 It is a schematic diagram of the cross-sectional structure of the present disclosure; Figure 4 for Figure 3 The enlarged structural diagram at A in the middle; Figure 5 This is the main view of the distribution plate; Figure 6 This is the rear view of the valve plate; Figure 7 It is a schematic diagram of the position relationship between the distribution plate and the distribution window in a certain state; In the figure: 100, pump housing assembly, 200, base, 300, distribution plate, 400, inclined plate, 500, cylinder body, 210, medium input channel, 220, medium output channel, 310, first through groove, 320, second through groove, 510, plunger hole, 600, sliding plunger, 700, wear ring, 710, friction part, 720, sliding part, 721, third through hole, 711, distribution window, 800, driving shaft, 810, first fixing ring, 790, first elastic member, 900, variable adjustment assembly, 910, rotating shaft, 920, second fixing ring, 921, threaded hole, 922, tightening bolt, 330, unloading groove, 340, distribution box, 341, containing space, 331, arc-shaped portion, 332, annular portion, 350, partition plate, 3311, first section, 3312, second section. DETAILED DESCRIPTION

[0019] The present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0020] In order to simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0021] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0022] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0024] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] like Figure 1~Figure 4As shown, it shows an axial piston pump with good self-priming performance in one embodiment of the present disclosure, including a pump housing assembly 100, a base 200, a distribution plate 300, a swash plate 400 and a cylinder body 500, and the pump housing assembly 100 plays a role in protecting internal components. The base 200 is bolted to the pump housing assembly 100, providing stable support for the pump housing assembly 100, the distribution plate 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 connected to 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 distribution plate 300 is located below the cylinder body 500, and the distribution plate 300 is provided with a first through groove 310 and a second through groove 320, which are respectively connected to 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 cylindrical, and a plurality of plunger holes 510 are evenly distributed inside. The plunger holes 510 extend along the axial direction of the cylinder body 500 .

[0026] The sliding plunger 600 can slide back and forth in the plunger hole 510. The sliding plunger 600 is made of a high-strength, 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 are matched with high precision to ensure that the pressure in the plunger hole 510 can change with the sliding of the sliding plunger 600.

[0027] 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 they are slidably arranged in the plunger holes 510 in a one-to-one correspondence. The sliding direction of the sliding part 720 is parallel to the sliding direction of the sliding plunger 600, ensuring the stability of the sliding of the sliding part 720. The sliding part 720 is provided with a third through hole 721 connected to the plunger hole 510, and the third through hole 721 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 tightly abutted against the top of the distribution plate 300. The friction part 710 is also made of materials with excellent wear resistance, such as ceramic-based composite materials, to cope with long-term friction with the distribution plate 300. A plurality of flow distribution windows 711 are formed on the friction portion 710 , and the flow distribution windows 711 are connected to the third through holes 721 on the sliding portion 720 in a one-to-one correspondence.

[0028] 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 driven by a transmission shaft). Due to the inclination of the swash plate 400 and the fact that one end of the sliding piston 600 always contacts the swash plate through the sliding shoe, the sliding piston 600 slides back and forth in the piston hole 510. When the sliding piston 600 slides away from the distribution plate 300, the volume in the piston hole 510 increases and the pressure decreases, forming a pressure difference between the medium input channel 210 and the piston hole 510, so that the medium passes through the first through groove 310 from the medium input channel 210 of the base 200, and then passes 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 to enter the piston hole 510. At this time, the friction part 710 of the wear-resistant ring 700 is in close contact with the distribution plate 300 to prevent leakage of the medium.

[0029] When the sliding plunger 600 slides toward the distribution plate 300, the medium in the plunger hole 510 is compressed and the pressure increases. 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 medium pumping process.

[0030] During the whole process, the sliding part 720 of the wear-resistant ring 700 slides in the plunger hole 510 along with the movement of the sliding plunger 600, and due to the addition of the wear-resistant ring 700, the friction part 710 always keeps 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 situation where the medium flows out of the gap between the cylinder body 500 and the distribution plate 300.

[0031] The traditional inclined plate 400 type plunger pump is prone to wear of the distribution plate 300 due to the direct contact and long-term relative movement between the cylinder body 500 and the distribution plate 300, which in turn affects the pumping efficiency. This design disperses the wear of the cylinder body 500 to the friction part 710 of the wear-resistant ring 700 by adding a 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 plunger hole 510, it can follow the wear of the wear ring 700 or the distribution plate 300 to perform adaptive sliding adjustment, so that the friction part 710 always maintains a good contact state 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 work efficiency.

[0032] After actual testing, under the same working conditions, the replacement frequency and maintenance cycle of the valve plate 300 can be extended by 2-3 times. Since the leakage of the medium from the gap between the cylinder body 500 and the valve plate 300 is reduced, more medium can be effectively pumped, the volumetric efficiency of the pump is improved, and the overall pumping efficiency is improved.

[0033] In some examples, an axial piston pump with good self-priming performance provided by at least one embodiment of the present disclosure also includes a drive shaft 800, which passes through the pump housing assembly 100, is connected to the rotary drive device and drives the cylinder body 500 to rotate through a spline. A first fixing ring 810 is provided on the drive shaft 800, and the first fixing ring 810 is firmly fixed to the drive shaft 800 by means of a key connection or an interference fit, so as to ensure that no relative rotation or axial movement occurs during the operation of the pump. The first elastic member 790 is a high-strength spring, such as a spiral compression spring, and its two ends are in contact with the first fixing ring 810 and the wear-resistant ring 700 respectively. The elastic force of the first elastic member 790 can act continuously and stably to elastically push the wear-resistant ring 700 toward the direction of the distribution plate 300.

[0034] During the entire working process, the wear-resistant ring 700 always maintains good contact with the distribution plate 300 under the action of the first elastic member 790. Even if the distribution plate 300 is worn to a certain extent, the first elastic member 790 can compensate for the gap caused by wear through elastic deformation and maintain the sealing performance.

[0035] In some examples, the outer wall of the sliding portion 720 and the inner wall of the plunger hole 510 are in sliding sealing contact, and this sealing contact method greatly improves the sealing of the pump. The sliding portion 720 is made of a special self-lubricating wear-resistant material, such as a polyetheretherketone composite material with molybdenum disulfide added, which not only has excellent wear resistance, but also can effectively reduce the friction coefficient and energy loss during the sliding process. Rubber can be added to the side wall of the sliding portion 720 close to the sliding plunger 600, and the rubber can increase the sealing performance between the outer wall of the sliding portion 720 and the inside of the plunger hole 510 through deformation.

[0036] In some examples, the swash plate 400 is rotatably arranged relative to the pump housing assembly 100, and its rotation axis is located on the symmetric plane of the medium input channel 210 and the medium output channel 220. When the swash plate 400 is rotated, the stroke and pumping direction of the sliding plunger 600 can be changed, and the intersection point of the ascending interval and the descending interval of the sliding plunger 600 in the plunger hole 510 will not change. For example, when the tilt angle of the swash plate 400 increases to one side, the reciprocating stroke of the sliding plunger 600 in the plunger hole 510 becomes longer, and the pumping flow rate increases accordingly; conversely, when the tilt angle decreases, the stroke is shortened and the flow rate decreases. At the same time, by changing the tilt direction of the swash plate 400, the medium pumping direction can be reversed to meet the needs of different working scenes. The rotation adjustment assembly includes a rotating shaft 910, which is rotatably mounted on the pump housing assembly 100, one end of which is firmly connected to the swash plate 400, and the other end passes through the pump housing assembly 100 and extends to the outside. When the rotating shaft 910 rotates under the action of external force, it can drive the swash plate 400 to rotate synchronously, thereby realizing the adjustment of the stroke of the sliding plunger 600 and the pumping direction. The second fixing ring 920 is arranged on the pump housing assembly 100, and the rotating shaft 910 passes through it. The second fixing ring 920 is provided with a threaded hole 921, and the threaded hole 921 matches the tightening bolt 922, and is tightened by a threaded connection. When it is necessary to adjust the angle of the swash plate 400, loosen the tightening bolt 922, and the rotating shaft 910 can rotate freely, thereby driving the swash plate 400 to change its angle; after the adjustment is completed, tighten the tightening bolt 922 to tighten the rotating shaft 910, thereby fixing the angle of the swash plate 400, ensuring that the angle of the swash plate 400 will not change due to vibration or external force interference during operation, thereby ensuring the stable operation of the pump.

[0037] By setting the variable adjustment component 900, the rotation angle of the swash plate 400 can be precisely controlled, and the stroke and pumping direction of the sliding plunger 600 can be flexibly adjusted to meet the requirements of pumping flow and direction under different working conditions. This design enables the axial piston pump to be adaptively adjusted according to the actual working conditions, improving the versatility and working efficiency of the pump. At the same time, combined with the sealing design of the wear-resistant ring 700, the first elastic member 790, and the sliding part 720 and the inner wall of the plunger hole 510, the wear and leakage of the distribution plate 300 and the medium leakage are effectively solved, and the self-priming performance and overall reliability of the pump are enhanced.

[0038] It should be further explained that the swash plate 400 and the cylinder body 500 are in the form of a ball hinge, and the device is provided with a return assembly, which is used to assist the plunger to slide away from the distribution plate 300, thereby sucking the medium from the medium input channel 210. Since the specific structure can be achieved by conventional means, it will not be described here.

[0039] like Figure 5~Figure 7As shown, in some examples, a relief groove 330 is provided on the distribution plate 300, and the relief groove 330 is located between the first through groove 310 and the second through groove 320. Its main function is to avoid oil entrapment when the plunger hole 510 transitions from the oil suction area to the oil pressure area or from the oil pressure area to the oil suction area during the operation of the plunger pump, and the impact and noise caused by the sudden change of pressure can be effectively reduced through the relief groove 330. For example, when the plunger hole 510 leaves the oil suction area and enters the dead volume, the medium in the relief groove 330 can enter the plunger hole 510 under the action of the pressure difference, thereby avoiding the overlapping area of ​​the medium input channel 210 and the distribution window 711 from gradually decreasing, resulting in an increase in the axial force on the sliding plunger 600. Moreover, the unloading groove 330 can be filled with the conveying medium in advance by being connected to the distribution box 340, which not only prevents gas from entering the plunger hole 510, but also avoids vibration and noise caused by pressure increase due to the gradual reduction of the overlapping area between the medium input channel 210 and the distribution window 711.

[0040] The flow distribution box 340 is located outside the pump housing assembly 100, and has a containing space 341 inside. The medium contained in the containing space 341 is the same as the medium transported by the plunger pump, and the containing space 341 is connected to the unloading groove 330 of the flow distribution plate 300. The flow distribution box 340 plays the role of collecting and regulating 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 medium from flowing disorderly in the pump and causing pressure fluctuations; on the other hand, it can ensure that the unloading groove 330 is always filled with medium to prevent air from entering.

[0041] The unloading groove 330 in the transmission plunger pump is divided into the unloading groove 330 from the oil inlet area to the oil pressure area connected to the medium input channel 210 and the unloading groove 330 from the oil pressure area to the oil inlet area connected to the outside. When the pumping direction is changed by the inclination direction of the swash plate 400, the device needs to be disassembled in advance to change the position of the oil distribution plate. The device can adapt to the change of the pumping direction without disassembling the plunger pump through the unloading groove 330 connected to the external distribution box 340.

[0042] In some examples, the height of the manifold box 340 is greater than that of the manifold plate 300 .

[0043] When the plunger hole 510 enters the oil pressure zone from the oil suction zone, 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. The height of the distribution box 340 is greater than the distribution plate 300, and the medium can be automatically replenished into the unloading groove 330 under the action of gravity. When the plunger hole 510 enters the oil suction zone from the oil pressure zone, part of the medium in the plunger hole 510 will be discharged into the unloading groove 330.

[0044] In some examples, the unloading groove 330 on the distribution plate 300 is composed of two arc-shaped portions 331 and an annular portion 332. The two arc-shaped portions 331 are respectively 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 portion 332.

[0045] The two arc-shaped portions 331 are located on the path of the flow distribution window 711, and the annular portion 332 is located at the bottom of the friction portion 710, and the annular portion 332 and the bottom of the friction portion 710 form a closed space to prevent leakage of the medium in the annular portion 332. On the other hand, the annular portion 332 reduces the contact area between the flow distribution disk 300 and the friction portion 710, so that the hard friction area between the friction portion 710 and the flow distribution ring is changed into soft friction between the medium.

[0046] In some examples, the angle formed by the two ends of the arc portion 331 and the rotation center of the cylinder body 500 is not less than the angle formed by the two ends of the distribution window 711 and the rotation center of the cylinder body 500 .

[0047] Since the arc portion 331 has a large angle, on the one hand, the area of ​​the dead volume can be minimized to avoid the influence of the dead volume on the plunger pump, and on the other hand, the distribution window 711 can be prevented from connecting the medium input channel 210 and the medium output channel 220, thereby causing the plunger pump to fail.

[0048] In some examples, the distribution plate 300 also includes a partition plate 350, which has two partition plates 350 respectively arranged in the two arc-shaped portions 331, and the partition plate 350 is used to divide the arc-shaped portion 331 into a first section 3311 and a second section 3312. The first sections 3311 of the two arc-shaped portions 331 are interconnected through the annular portion 332, and the second sections 3312 of the two arc-shaped portions 331 are interconnected through the annular portion 332.

[0049] By providing a partition plate 350 at the arc portion 331 of the unloading groove 330, the arc portion 331 is divided into two sections, and the two sections are connected through the annular portion 332, thereby further optimizing the pressure regulating function of the unloading groove 330. When the two plunger holes 510 are located at the two ends of an arc segment, the two plunger holes 510 are connected to the medium input channel 210 and the medium output channel 220 through the unloading groove 330.

[0050] In some examples, there are two flow distribution boxes 340 , and the two flow distribution boxes 340 are respectively connected to the first section 3311 and the second section 3312 .

[0051] The two flow distribution boxes 340 are respectively connected to the first section 3311 and the second section 3312 of the unloading groove 330, so as to realize the precise segmented adjustment of the pressure of the unloading groove 330. During the operation of the plunger pump, the pressure fluctuation can be buffered and balanced more effectively. Compared with the design of a single flow distribution box 340, the pressure stability is improved, ensuring that the pump can operate stably under different working conditions, and reducing the pressure instability caused by the two plunger holes 510 being located at both ends of an arc portion 331.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, which should be included 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 body (500), wherein the cylinder body (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 groove (310) and a second through groove (320) respectively connected to the medium input channel (210) and the medium output channel (220), and the cylinder body (500) has a plurality of plunger holes (510), characterized in that: Also includes: A sliding plunger (600) is slidably disposed in the plunger hole (510), one end of the sliding plunger (600) always abuts against the swash plate (400), and the sliding plunger (600) is used to pump the medium from the medium input channel (210) to the medium output channel (220) after sliding; The wear-resistant ring (700) comprises a friction portion (710) and a plurality of sliding portions (720), wherein the sliding portions (720) are slidably arranged in the plunger hole (510) in a one-to-one correspondence, and the sliding direction of the sliding portion (720) is parallel to the sliding direction of the sliding plunger (600). The wear-resistant ring (700) can be pushed toward the distribution plate (300) so that the bottom of the friction portion (710) is always in contact with the top of the distribution plate (300), and the sliding portion (720) has a third through hole (721) connected to the plunger hole (510). The friction portion (710) has a plurality of distribution windows (711), and the distribution windows (711) are connected to the third through holes (721) in a one-to-one correspondence, and the distribution windows (711) are connected to the first through groove (310) or the second through groove (320).

2. The axial piston pump with good self-priming performance according to claim 1, further comprising: The first elastic member (790) has two ends acting on the first fixing ring (810) and the wear-resistant ring (700) respectively, and the first elastic member (790) is used to elastically push the friction portion (710) to abut against the top of the distribution plate (300).

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

4. The axial piston pump with good self-priming performance according to claim 1, characterized in that: The distribution plate (300) further comprises a relief groove (330), wherein the relief groove (330) is located between the first through groove (310) and the second through groove (320), and further comprises: The flow distribution box (340) is located outside the pump casing assembly (100); the flow distribution box (340) has a containing space (341); the containing space (341) is in communication with the unloading groove (330).

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

6. An axial piston pump with good self-priming performance according to claim 4, characterized in that: The unloading groove (330) has two arc-shaped portions (331) and two annular portions (332) symmetrically arranged and used to connect the two arc-shaped portions (331); the two arc-shaped portions (331) are respectively located between adjacent ends of the first through groove (310) and the second through groove (320); the two arc-shaped portions (331) are used to connect with the distribution window (711); and the two arc-shaped portions (331) are connected to each other via the annular portion (332).

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

8. An axial piston pump with good self-priming performance according to claim 6, characterized in that: The distribution plate (300) further includes: The partition plate (350) has two portions which are respectively arranged in the two arc-shaped portions (331); the partition plate (350) is used to divide the arc-shaped portion (331) into a first section (3311) and a second section (3312); the first sections (3311) of the two arc-shaped portions (331) are connected to each other via the annular portion (332); and the second sections (3312) of the two arc-shaped portions (331) are connected to each other via the annular portion (332).

9. An axial piston pump with good self-priming performance according to claim 8, characterized in that: The flow distribution boxes (340) are two, and the two flow distribution boxes (340) are connected to the first section (3311) and the second section (3312) in a one-to-one correspondence.

10. An axial piston pump with good self-priming performance according to any one of claims 1 to 9, characterized in that: The swash plate (400) is rotatably arranged relative to the pump housing assembly (100). 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 a symmetric plane between the medium input channel (210) and the medium output channel (220). The swash plate (400) also includes a variable adjustment assembly (900). The variable adjustment assembly (900) includes: a rotating shaft (910) rotatably disposed on the pump housing assembly (100), one end of the rotating shaft (910) being disposed on the swash plate (400) and the other end penetrating the pump housing assembly (100), the rotating shaft (910) being used to drive the swash plate (400) to rotate; A second fixing ring (920) is arranged on the pump housing assembly (100); the rotating shaft (910) passes through the second fixing ring (920); the second fixing ring (920) has a threaded hole (921); the threaded hole (921) is used for threaded connection with a tightening bolt (922); the tightening bolt (922) is used for tightening or loosening the rotating shaft (910).

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