A low-pressure pulsating hydraulic pump flow distribution mechanism and hydraulic pump

Abstract

The present invention relates to the technical field of hydraulic pumps, and in particular, to a low-pressure pulsating hydraulic pump distribution mechanism and a hydraulic pump. The low-pressure pulsating hydraulic pump distribution mechanism includes a distribution disc unit and a buffer unit. The distribution disc unit includes a distribution disc body; the distribution disc body is disc-shaped; the distribution disc body is sequentially distributed with an oil suction area, a pressure-increasing transition area, an oil discharge area, and a pressure-reducing transition area along its circumferential direction; the distribution disc body is provided with a first shock-absorbing hole; the first shock-absorbing hole is located in the pressure-increasing transition area; the buffer unit includes a buffer shell; the buffer shell has a buffer cavity; the buffer shell has an oil inlet and an oil outlet; the oil inlet is connected to the buffer cavity; the oil outlet is connected to the buffer cavity; the first shock-absorbing hole is connected to the oil inlet; and the oil outlet is connected to the oil discharge area. This solves the problem of poor pressure pulsation suppression during oil discharge and oil delivery in the hydraulic pump.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, and in particular to a low-pressure pulsating hydraulic pump flow distribution mechanism and a hydraulic pump. Background Art

[0002] The core components of a hydraulic pump include the plunger assembly, swash plate mechanism, and oil distribution system. The hydraulic pump drives the plunger rod to reciprocate within the cylinder bore by adjusting the swash plate's inclination. This motion, combined with the oil suction and discharge ports on the oil distribution plate, ensures the directional delivery of hydraulic oil. The plunger assembly and cylinder bore feature a high-precision clearance design, ensuring stable operation even under high-pressure conditions.

[0003] However, current hydraulic pumps experience pressure pulsation during the oil discharge and delivery process. This pressure pulsation phenomenon primarily stems from the coupling of flow fluctuations generated by the cyclical motion of the plunger and the transient impact of the oil distribution plate during flow distribution. Furthermore, the superposition of flows generated by the coordinated operation of multiple plungers exacerbates pressure fluctuations caused by oil compressibility under high differential pressure conditions, resulting in limited suppression of pressure pulsation. This makes it difficult to meet the increasingly stringent aerospace requirements for hydraulic pumps requiring integrated design, lightweight design, and low pressure pulsation. Summary of the Invention

[0004] In order to solve the problem that the hydraulic pump has poor effect in suppressing pressure pulsation during oil discharge and oil delivery, the present invention provides a low-pressure pulsation hydraulic pump distribution mechanism and a hydraulic pump.

[0005] In a first aspect, the present invention provides a low-pressure pulsating hydraulic pump flow distribution mechanism, the low-pressure pulsating hydraulic pump flow distribution mechanism comprising:

[0006] The distribution disc unit comprises a distribution disc body; the distribution disc body is disc-shaped; the distribution disc body is sequentially provided with an oil suction area, a pressure-increasing transition area, an oil discharge area and a pressure-reducing transition area along its circumferential direction; the distribution disc body is provided with a first shock-absorbing hole; the first shock-absorbing hole is located in the pressure-increasing transition area; the length of the pressure-increasing transition area in the circumferential direction of the distribution disc is a first arc length; in the circumferential direction of the distribution disc, the spacing between the first shock-absorbing hole and the oil discharge area is a second arc length; the second arc length is less than half of the first arc length; the oil suction area and the oil discharge area both extend along the circumferential direction of the distribution disc; the width direction of the oil suction area and the oil discharge area is the radial direction of the distribution disc; the diameter of the first shock-absorbing hole is less than the width of the oil discharge area;

[0007] A buffer unit, comprising a buffer shell; a buffer cavity is provided in the buffer shell; an oil inlet and an oil outlet are provided on the buffer shell; the oil inlet is communicated with the buffer cavity; the oil outlet is communicated with the buffer cavity; the first shock-absorbing hole is communicated with the oil inlet; and the oil outlet is communicated with the oil drainage area.

[0008] In some embodiments, the buffer chamber includes a first buffer chamber; the diameter of the first buffer chamber is larger than the diameter of the oil inlet; the diameter of the first buffer chamber is larger than the diameter of the oil outlet; the oil inlet is connected to the first buffer chamber; the oil outlet is connected to the first buffer chamber; the oil inlet is located at one end of the first buffer chamber.

[0009] In some embodiments, the buffer unit further includes a first fairing cap; the first fairing cap is located inside one end of the first buffer cavity near the oil inlet; the first fairing cap is detachably connected to the buffer housing; the first fairing cap includes a first fixing portion, a first avoidance portion and a first sealing portion; the first fixing portion, the first avoidance portion and the first sealing portion are integrally formed and connected; the first avoidance portion is located between the first fixing portion and the first sealing portion; the first fixing portion is detachably connected to the inner wall of the first buffer cavity; the first sealing portion is interference fit with the inner wall of the first buffer cavity; an annular first avoidance cavity is provided between the first avoidance portion and the inner wall of the first buffer cavity; the first fixing portion is located on the side of the first sealing portion facing the middle of the first buffer cavity; the first avoidance cavity is communicated with the oil inlet;

[0010] The first fixing part and the first avoidance part are hollow; the inner cavity of the first fixing part is connected with the inner cavity of the first avoidance part; the inner cavity of the first fixing part is connected with the first buffer cavity; a plurality of rectifying holes are provided on the first avoidance part; the plurality of rectifying holes are distributed around the inner cavity of the first avoidance part; the first avoidance cavity is connected with the inner cavity of the first avoidance part through the plurality of rectifying holes.

[0011] In some embodiments, the buffer cavity further includes a second buffer cavity and a first through hole; the second buffer cavity is connected to the first buffer cavity through the first through hole; the diameter of the second buffer cavity is greater than the diameter of the first through hole; the diameter of the first buffer cavity is greater than the diameter of the first through hole; the first buffer cavity is connected to the oil outlet through the second buffer cavity; the diameter of the oil outlet is smaller than the diameter of the second buffer cavity.

[0012] In some embodiments, a diameter of the oil inlet is smaller than a diameter of the first through hole.

[0013] In some embodiments, the buffer cavity further includes a third buffer cavity; the third buffer cavity is connected to the second buffer cavity; the length direction of the third buffer cavity is perpendicular to the length direction of the second buffer cavity; one end of the second buffer cavity is connected to the third buffer cavity; the diameter of the third buffer cavity is greater than the diameter of the second buffer cavity.

[0014] In some embodiments, the buffer unit also includes a throttle member; the throttle member blocks the third buffer chamber and the oil outlet; the throttle member includes a throttle plate; the throttle plate is detachably connected to the buffer shell; a throttle hole is provided on the throttle plate; the third buffer chamber is connected to the oil outlet through the throttle hole; the minimum diameter of the throttle hole is smaller than the diameter of the oil outlet.

[0015] In some embodiments, the buffer unit also includes a second fairing cap; the second fairing cap includes a second avoidance portion, a second sealing portion and a second fixing portion; the second avoidance portion, the second sealing portion and the second fixing portion are integrally formed and connected; the second sealing portion is located between the second avoidance portion and the second fixing portion; the second sealing portion is interference fit with the buffer shell; the second fixing portion is detachably connected to the buffer shell; a limiting shoulder is provided at the end of the third buffer chamber near the oil outlet; the throttle plate is clamped between the limiting shoulder and the second avoidance portion; a second avoidance chamber is provided between the second avoidance portion and the buffer shell; the second avoidance chamber is connected to the oil outlet; the second avoidance portion is hollow; a second connecting hole is provided on the second avoidance portion; the inner cavity of the second avoidance portion is connected to the second avoidance chamber through the second connecting hole; the inner cavity of the second avoidance portion and the third buffer chamber are connected through the throttle hole.

[0016] In some embodiments, in the length direction of the third buffer cavity, the distance from the connecting part of the second buffer cavity and the third buffer cavity to the throttle plate is a first distance, and the distance from the end of the third buffer cavity away from the throttle plate to the throttle plate is a second distance; the ratio of the first distance to the second distance is 0.15~0.3.

[0017] In some embodiments, the buffer cavity further includes a third buffer cavity and a second through hole; the third buffer cavity is connected to the second buffer cavity through the second through hole; the diameter of the second through hole is smaller than the diameter of the second buffer cavity; the diameter of the second through hole is smaller than the diameter of the third buffer cavity; the second buffer cavity is connected to the oil outlet through the third buffer cavity; the diameter of the oil outlet is smaller than the diameter of the third buffer cavity.

[0018] In some embodiments, a diameter of the first through hole is smaller than a diameter of the second through hole.

[0019] In a second aspect, the present invention provides a hydraulic pump, comprising:

[0020] The low-pressure pulsating hydraulic pump flow distribution mechanism as described in any one of the first aspects;

[0021] A housing, wherein the low-pressure pulsating hydraulic pump distribution mechanism is located in the housing; the low-pressure pulsating hydraulic pump distribution mechanism is detachably connected to the housing;

[0022] The rotor is located in the housing; the rotor is rotatably connected to the housing; the rotor is coaxial with the distribution plate; the rotation direction of the rotor is the direction in which the oil suction area, the boost transition area, the oil discharge area, and the pressure reduction transition area are arranged in sequence.

[0023] In order to solve the problem of poor suppression of pressure pulsation during oil discharge and delivery of the hydraulic pump, the present invention has the following advantages:

[0024] The oil intake, boost transition, discharge, and depressurization transition zones, arranged in the valve plate body, are combined with the oil outlet connection structure formed by sequentially connecting the first damping hole, the buffer unit, and the discharge zone in the boost transition zone. This creates a parallel branch to the oil discharge path during the valve plate body's rotation. When the plunger chamber approaches the discharge zone as the rotor rotates, it connects to the first damping hole before connecting to the discharge zone. This first damping hole, with a diameter smaller than the width of the discharge zone, throttles and replenishes oil. This allows the high-pressure oil in the discharge zone to be pressure-buffered by the buffer chamber before replenishing the oil pressure in the plunger chamber. This process allows the plunger chamber to complete the boost transition before entering the discharge zone. Pressure balance is established through the connection path between the oil inlet of the buffer housing and the discharge zone, effectively reducing the sudden pressure differential at the moment the plunger chamber and the discharge zone connect. This effectively suppresses the pressure pulsation caused by the transition from the suction port to the discharge port of the hydraulic pump's plunger chamber, improving the operational stability and service life of the hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a low-pressure pulsating hydraulic pump flow distribution mechanism according to an embodiment is shown;

[0026] Figure 2 Shown Figure 1 Schematic diagram of the buffer unit in;

[0027] Figure 3 Shown Figure 1 Schematic diagram of the middle distribution plate unit;

[0028] Figure 4 Shown Figure 2 A cross-sectional view of the first buffer cavity and the second buffer cavity;

[0029] Figure 5 Shown Figure 2 Cross-sectional view of the third buffer cavity.

[0030] Figure numerals: distribution plate unit 10; distribution plate body 11; oil suction area 12; oil discharge area 13; boost transition area 14; depressurization transition area 15; first shock-absorbing hole 16; second shock-absorbing hole 17; buffer unit 20; buffer shell 21; buffer cavity 22; first buffer cavity 221; second buffer cavity 222; first connecting hole 223; third buffer cavity 224; second connecting hole 225; oil inlet 23; oil outlet 24 first straightening cap 25; first sealing part 251; first avoidance part 252; first fixing part 253; first avoidance cavity 254; throttle member 26; throttle plate 261; throttle hole 262; second straightening cap 27; second avoidance part 271; second sealing part 272; second fixing part 273; second avoidance cavity 274. DETAILED DESCRIPTION

[0031] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0032] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise specified, "plurality" means two or more.

[0033] In this embodiment, during the operation of the hydraulic pump, when the oil flows from the suction area 12 through the pressure-increasing transition area 14 into the discharge area 13, a significant pressure difference exists between the discharge area 13 and the suction area 12, and a sudden pressure change is likely to occur at the moment the plunger cavity and the discharge area 13 are connected. Therefore, in order to solve the above problem, the present invention provides a low-pressure pulsating hydraulic pump flow distribution mechanism. Figure 1 As shown, the flow distribution mechanism of the low-pressure pulsating hydraulic pump includes a flow distribution plate unit 10 and a buffer unit 20 .

[0034] The distribution plate unit 10 includes a distribution plate body 11. The distribution plate body 11 is disc-shaped and has an oil suction area 12, a pressure-boosting transition area 14, an oil discharge area 13, and a pressure-reducing transition area 15 distributed along its circumference. The pressure-boosting transition area 14 is the transition area where the plunger cavity transitions from the connection to the oil suction area 12 to the connection to the oil discharge area 13 during the rotation of the hydraulic pump rotor; the pressure-reducing transition area 15 is the transition area where the plunger cavity transitions from the connection to the oil discharge area 13 to the connection to the oil suction area 12 during the rotation of the hydraulic pump rotor. The disc-shaped structure of the distribution plate enables zonal control of the oil flow direction, and the oil suction area 12 and the oil discharge area 13 form an oil flow channel. The distribution plate body 11 has a first damping hole 16, which is located in the pressure-boosting transition area 14. By arranging the first damping hole 16 in the pressure-boosting transition area 14, a structural foundation is provided for subsequent pressure buffering. The length of the pressure-boosting transition zone 14 along the circumference of the distribution plate is the first arc length. The distance between the first damping hole 16 and the oil drain area 13 along the circumference of the distribution plate is the second arc length, which is less than half the first arc length. This means that the first damping hole 16 is located close to the oil drain area 13, forming a pressure transition zone using the first damping hole 16. Both the oil suction area 12 and the oil drain area 13 extend along the circumference of the distribution plate, with their widths extending in the radial direction of the distribution plate. The diameter of the first damping hole 16 is smaller than the width of the oil drain area 13. Thus, the differentially sized first damping hole 16 and the oil drain area 13 enable pressure buildup in the plunger cavity. First, the plunger cavity is connected to the first damping hole 16, and the first damping hole 16 with a greater throttling effect is used to slowly build up pressure, so that the oil pressure in the plunger cavity gradually approaches the oil drain area 13, thereby reducing the pressure fluctuation at the moment the plunger cavity and the oil drain area 13 are connected. Until the oil pressure in the plunger cavity approaches the pressure in the oil drain area 13, the plunger rod can then slide to drain the oil in the plunger cavity to the oil drain area 13. The present invention uses the first damping hole 16 to pre-fill the plunger cavity with a small amount of oil, thereby achieving the initial pressure buildup in the plunger cavity, thereby achieving the effect of suppressing the pressure pulsation at the moment the plunger cavity and the oil drain area 13 are connected.

[0035] The buffer unit 20 includes a buffer shell 21. The buffer shell 21 has a buffer cavity 22 therein, and a pressure regulating space is formed by the volume characteristics of the cavity inside the shell. The buffer shell 21 has an oil outlet 24 and an oil inlet 23. The oil outlet 24 is connected to the buffer cavity 22, the oil inlet 23 is connected to the buffer cavity 22, the first shock-absorbing hole 16 is connected to the oil inlet 23, and the oil outlet 24 is connected to the oil drain area 13. The plunger cavity, the first shock-absorbing hole 16, the oil inlet 23, the buffer cavity 22, the oil outlet 24 and the oil drain area 13 are connected to form a first connecting path, and the direct connection between the oil plunger cavity and the oil drain area 13 forms a second connecting path. The first connecting path and the second connecting path constitute a parallel pressure buffer channel. This solution sets a first shock-absorbing hole 16 in the boost transition zone 14 to work together with the buffer chamber to form a pre-boost branch before the plunger cavity is connected to the oil discharge area 13, and uses a shunt pressure compensation method to reduce the pressure sudden change gradient, thereby reducing the pressure pulsation generated by the plunger cavity when the oil suction and oil discharge paths are switched.

[0036] In this embodiment, if Figure 4 As shown, the buffer chamber 22 includes a first buffer chamber 221. The diameter of the first buffer chamber 221 is larger than the diameter of the oil inlet 23, forming a volumetric buffer space. The diameter of the first buffer chamber 221 is larger than the diameter of the oil outlet 24, creating a throttling effect that reduces the flow rate of high-pressure oil upon entering the first buffer chamber 221. The oil outlet 24 communicates with the first buffer chamber 221, and the oil inlet 23 communicates with the first buffer chamber 221. The oil inlet 23 is located at one end of the first buffer chamber 221. This arrangement of the oil inlet 23 at one end of the first buffer chamber 221, combined with the intersection of the length of the first buffer chamber 221 and the orientation of the oil outlet 24, lengthens the flow path of the oil within the first buffer chamber 221. The throttling buffer structure formed by the first buffer chamber 221 attenuates the oil velocity within the first buffer chamber 221. This, combined with the cavity length, enables a pre-pressurization process where the oil is smoothly injected into the plunger chamber.

[0037] In this embodiment, if Figure 4As shown, the buffer unit 20 also includes a first fairing cap 25. The first fairing cap 25 is located inside one end of the first buffer chamber 221 close to the oil inlet 23, and the first fairing cap 25 is detachably connected to the buffer housing 21. The first fairing cap 25 includes a first fixing portion 253, a first avoidance portion 252 and a first sealing portion 251. The first fixing portion 253, the first avoidance portion 252 and the first sealing portion 251 are connected, and the connection can be a fixed connection or an integral molding. The first avoidance portion 252 is located between the first fixing portion 253 and the first sealing portion 251. The first fixing portion 253 is detachably connected to the inner wall of the first buffer chamber 221, and the first sealing portion 251 is interference fit with the inner wall of the first buffer chamber 221 to form a pressure seal. An annular first avoidance cavity 254 is defined between the first avoidance portion 252 and the inner wall of the first buffer cavity 221 . The first fixing portion 253 is located on one side of the first sealing portion 251 facing the middle of the first buffer cavity 221 . The first avoidance cavity 254 is connected to the oil inlet 23 .

[0038] The first fixed portion 253 and the first escape portion 252 are hollow. The hollow structures of the first fixed portion 253 and the first escape portion 252 connect to the first buffer chamber 221, forming a multi-stage fluid channel. The inner cavity of the first fixed portion 253 communicates with the inner cavity of the first escape portion 252, which in turn communicates with the first buffer chamber 221. The first escape portion 252 is provided with multiple rectifying holes distributed around the inner cavity of the first escape portion 252. The first escape chamber 254 communicates with the inner cavity of the first escape portion 252 via the multiple rectifying holes. This uniform distribution of rectifying holes directs oil from the inner cavity of the first escape portion 252 to the escape chamber. The coordination of the escape chamber and the rectifying holes causes the oil to undergo a path change during its flow, undergoing diffusion, contraction, and re-diffusion. This multi-stage diversion reduces turbulence intensity, ultimately achieving a smooth transition in the oil flow state and minimizing pressure pulsation generated when switching oil discharge paths.

[0039] In this embodiment, if Figure 4As shown, the buffer chamber 22 also includes a second buffer chamber 222 and a first through hole. The second buffer chamber 222 is connected to the first buffer chamber 221 through the first through hole. The diameter of the second buffer chamber 222 is larger than the diameter of the first through hole. The diameter of the first buffer chamber 221 is larger than the diameter of the first through hole. The first buffer chamber 221 is connected to the oil outlet 24 through the second buffer chamber 222. The diameter of the oil outlet 24 is smaller than the diameter of the second buffer chamber 222. By setting the structural parameter that the diameter of the second buffer chamber 222 is larger than that of the first through hole, a two-level volume buffer space is formed. The communication path between the first buffer chamber 221 and the oil outlet 24 through the second buffer chamber 222, combined with the size design that the diameter of the oil outlet 24 is smaller than that of the second buffer chamber 222, constructs a stepped throttling structure. Thus, by utilizing the series layout of the two-stage buffer chamber, the oil passes through the cavity spaces of different sizes in sequence, and the multi-stage attenuation of the pressure fluctuation energy is achieved by gradually reducing the flow rate.

[0040] In other embodiments, the length of the second buffer chamber 222 intersects with the length of the first connecting hole 223, and the length of the first buffer chamber 221 intersects with the length of the first connecting hole 223. Preferably, the length of the second buffer chamber 222 is perpendicular to the length of the first connecting hole 223, and the length of the first buffer chamber 221 is perpendicular to the length of the first connecting hole 223, thereby reducing the difficulty of component processing. In another embodiment, the first buffer chamber 221 is parallel to the second buffer chamber 222, the length of the second buffer chamber 222 is greater than the length of the first connecting hole 223, and the length of the first buffer chamber 221 is greater than the length of the first connecting hole 223. The distribution plate body 11 has a second shock-absorbing hole 17; the second shock-absorbing hole 17 is located in the pressure reduction transition zone 15.

[0041] In this embodiment, if Figure 4 As shown, the diameter of the oil inlet 23 can be set to be smaller than the diameter of the first through hole. By controlling the diameter relationship between the oil inlet 23 and the first through hole, a differentiated throttling gradient is formed, thereby achieving a smoother transition of the oil pressure during the step-by-step attenuation process based on the two-stage buffer structure.

[0042] In this embodiment, if Figure 5 As shown, the buffer cavity 22 also includes a third buffer cavity 224. The third buffer cavity 224 communicates with the second buffer cavity 222. The length of the third buffer cavity 224 is perpendicular to the length of the second buffer cavity 222. One end of the second buffer cavity 22 is connected to the third buffer cavity 224. The diameter of the third buffer cavity 224 is larger than the diameter of the second buffer cavity 222. By providing the third buffer cavity 224 and the second buffer cavity 222 in a vertical arrangement, a vertical spatial layout is formed, which reduces the number of independent hole opening steps in the manufacturing process.

[0043] When the length direction of the third buffer cavity 224 is parallel to the length direction of the second buffer cavity 222 , a parallel spatial layout is formed by arranging the parallel distributed first buffer cavity 221 and the second buffer cavity 222 , thereby effectively optimizing the internal space utilization of the device.

[0044] In this embodiment, if Figure 5 As shown, the buffer unit 20 also includes a throttle member 26. The throttle member 26 blocks the third buffer chamber 22 from the oil outlet 24. The throttle member 26 includes a throttle plate 261. The throttle plate 261 is detachably connected to the buffer housing 21 and is provided with a throttle hole 262. The third buffer chamber 22 is connected to the oil outlet 24 through the throttle hole 262. The minimum diameter of the throttle hole 262 is smaller than the diameter of the oil outlet 24. The difference in diameter between the throttle hole 262 and the oil outlet 24 creates a secondary throttling effect. A replaceable barrier structure is formed between the third buffer chamber 22 and the oil outlet 24, achieving a stepped attenuation of the oil pressure through graded throttling control. The diameter of the throttle hole 262 facing the oil outlet 24 is larger than the diameter of the throttle hole 262 facing the third buffer chamber 224, thereby guiding the oil through the stepped throttle hole 262.

[0045] In this embodiment, if Figure 5 As shown, the buffer unit 20 also includes a second fairing cap 27. The second fairing cap 27 includes a second avoidance portion 271, a second sealing portion 272, and a second fixing portion 273. The second avoidance portion 271, the second sealing portion 272, and the second fixing portion 273 are connected, and this connection can be fixed or integrally formed. The second sealing portion 272 is located between the second avoidance portion 271 and the second fixing portion 273. This placement of the removable second fixing portion 273 outward can prevent damage to the sealing area and prevent debris from entering the oil during disassembly and assembly. The second sealing portion 272 forms an interference fit with the buffer housing 21, forming a pressure seal. The second fixing portion 273 is detachably connected to the buffer housing 21, possibly by a threaded connection. A limiting shoulder is provided at the end of the third buffer chamber 22 near the oil outlet 24. The throttle plate 261 is clamped between the limiting shoulder and the second relief portion 271. A second relief chamber 274 is defined between the second relief portion 271 and the buffer housing 21, communicating with the oil outlet 24. The second relief portion 271 is hollow and has a second connecting hole 225 defined therein. The inner cavity of the second relief portion 271 communicates with the second relief chamber 274 via the second connecting hole 225. The inner cavity of the second relief portion 271 communicates with the third buffer chamber 22 via the throttle hole 262. By utilizing the hollow structure of the second relief portion 271 and the connecting hole to form an auxiliary flow channel, combined with the restraining effect of the limiting shoulder, a multi-functional sealing and fluid guiding structure is constructed.

[0046] In this embodiment, if Figure 5 As shown, along the length of the third buffer chamber 224, the distance from the connecting point between the second buffer chamber 222 and the third buffer chamber 224 to the throttle plate 261 is a first distance, and the distance from the end of the third buffer chamber 224 away from the throttle plate 261 to the throttle plate 261 is a second distance. The ratio of the first distance to the second distance is between 0.15 and 0.3. This creates a pre-buffer region of a specific length, and the distance ratio is used to precisely control the residence time of the oil in the third buffer chamber 224, achieving a gradient attenuation of the pressure fluctuation energy within a specific spatial range.

[0047] In this embodiment, if Figure 5 As shown, the buffer chamber 22 also includes a third buffer chamber 224 and a second through hole; the third buffer chamber 224 is connected to the second buffer chamber 222 through the second through hole; the diameter of the second through hole is smaller than the diameter of the second buffer chamber 222; the diameter of the second through hole is smaller than the diameter of the third buffer chamber 224; the second buffer chamber 222 is connected to the oil outlet 24 through the third buffer chamber 224; the diameter of the oil outlet 24 is smaller than the diameter of the third buffer chamber 224. By providing a second through hole to connect buffer chambers of different diameters, a three-stage throttling buffer structure is formed, thereby utilizing the decreasing relationship of the second through hole diameter to create a step-by-step enhanced throttling effect, causing the oil to sequentially experience flow rate restriction processes of different intensities, thereby achieving layered attenuation of pressure pulsations. In this embodiment, the connecting point between the second buffer chamber 222 and the third buffer chamber 224 is at the end of the second buffer chamber 222. In another embodiment, it is the second connecting hole 225.

[0048] In this embodiment, if Figure 4 、 5 As shown, the diameter of the first through hole is smaller than that of the second through hole, thereby utilizing the combination relationship of through holes with decreasing diameters to establish an asymmetric flow control channel between adjacent buffer cavities, thereby enhancing the layered effect of pressure buffering.

[0049] In this embodiment, the present invention provides a hydraulic pump, which includes the low-pressure pulsating hydraulic pump flow distribution mechanism, housing, and rotor as described in any one of the above embodiments.

[0050] The low-pressure pulsating hydraulic pump flow distribution mechanism is located in the shell, and the low-pressure pulsating hydraulic pump flow distribution mechanism is detachably connected to the shell.

[0051] The rotor is located within the housing, rotatably connected to the housing and coaxial with the valve plate. Its rotational direction corresponds to the sequential arrangement of the oil suction area 12, the pressure-boosting transition area 14, the oil discharge area 13, and the pressure-reducing transition area 15. The removable connection between the valve plate and the housing of the low-pressure pulsating hydraulic pump facilitates maintenance. The spatial correspondence between the rotor's rotational direction and the functional zones of the valve plate ensures a continuous pressure transition when switching between zones, thus forming a complete hydraulic energy conversion system.

[0052] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A low-pressure pulsating hydraulic pump flow distribution mechanism, characterized in that: The low-pressure pulsating hydraulic pump flow distribution mechanism includes: The distribution disc unit comprises a distribution disc body; the distribution disc body is disc-shaped; the distribution disc body is sequentially provided with an oil suction area, a pressure-increasing transition area, an oil discharge area and a pressure-reducing transition area along its circumferential direction; the distribution disc body is provided with a first shock-absorbing hole; the first shock-absorbing hole is located in the pressure-increasing transition area; the length of the pressure-increasing transition area in the circumferential direction of the distribution disc is a first arc length; in the circumferential direction of the distribution disc, the spacing between the first shock-absorbing hole and the oil discharge area is a second arc length; the second arc length is less than half of the first arc length; the oil suction area and the oil discharge area both extend along the circumferential direction of the distribution disc; the width direction of the oil suction area and the oil discharge area is the radial direction of the distribution disc; the diameter of the first shock-absorbing hole is less than the width of the oil discharge area; A buffer unit, comprising a buffer housing; a buffer cavity within the buffer housing; an oil inlet and an oil outlet on the buffer housing; the oil inlet communicating with the buffer cavity; the oil outlet communicating with the buffer cavity; the first damping hole communicating with the oil inlet; and the oil outlet communicating with the oil drain area. The buffer chamber includes a first buffer chamber; the diameter of the first buffer chamber is larger than the diameter of the oil inlet; the diameter of the first buffer chamber is larger than the diameter of the oil outlet; the oil inlet is in communication with the first buffer chamber; the oil outlet is in communication with the first buffer chamber; the oil inlet is located at one end of the first buffer chamber; The buffer unit also includes a first fairing cap; the first fairing cap is located inside one end of the first buffer chamber near the oil inlet; the first fairing cap is detachably connected to the buffer housing; the first fairing cap includes a first fixing portion, a first avoidance portion and a first sealing portion; the first fixing portion, the first avoidance portion and the first sealing portion are integrally formed and connected; the first avoidance portion is located between the first fixing portion and the first sealing portion; the first fixing portion is detachably connected to the inner wall of the first buffer chamber; the first sealing portion is interference fit with the inner wall of the first buffer chamber; an annular first avoidance cavity is provided between the first avoidance portion and the inner wall of the first buffer chamber; the first fixing portion is located on the side of the first sealing portion facing the middle of the first buffer chamber; the first avoidance cavity is communicated with the oil inlet; The first fixing part and the first avoidance part are hollow; the inner cavity of the first fixing part is connected with the inner cavity of the first avoidance part; the inner cavity of the first fixing part is connected with the first buffer cavity; a plurality of rectifying holes are provided on the first avoidance part; the plurality of rectifying holes are distributed around the inner cavity of the first avoidance part; the first avoidance cavity is connected with the inner cavity of the first avoidance part through the plurality of rectifying holes.

2. A low-pressure pulsating hydraulic pump flow distribution mechanism according to claim 1, characterized in that: The buffer chamber also includes a second buffer chamber and a first through hole; the second buffer chamber is connected to the first buffer chamber through the first through hole; the diameter of the second buffer chamber is larger than the diameter of the first through hole; the diameter of the first buffer chamber is larger than the diameter of the first through hole; the first buffer chamber is connected to the oil outlet through the second buffer chamber; the diameter of the oil outlet is smaller than the diameter of the second buffer chamber.

3. A low-pressure pulsating hydraulic pump flow distribution mechanism according to claim 2, characterized in that: The diameter of the oil inlet is smaller than the diameter of the first through hole.

4. A low-pressure pulsating hydraulic pump flow distribution mechanism according to claim 3, characterized in that: The buffer cavity also includes a third buffer cavity; the third buffer cavity is connected to the second buffer cavity; the length direction of the third buffer cavity is perpendicular to the length direction of the second buffer cavity; one end of the second buffer cavity is connected to the third buffer cavity; the diameter of the third buffer cavity is larger than the diameter of the second buffer cavity.

5. A low-pressure pulsating hydraulic pump flow distribution mechanism according to claim 4, characterized in that: The buffer unit also includes a throttle member; the throttle member blocks the third buffer chamber and the oil outlet; the throttle member includes a throttle plate; the throttle plate is detachably connected to the buffer housing; a throttle hole is provided on the throttle plate; the third buffer chamber is connected to the oil outlet through the throttle hole; the minimum diameter of the throttle hole is smaller than the diameter of the oil outlet.

6. A low-pressure pulsating hydraulic pump flow distribution mechanism according to claim 5, characterized in that: The buffer unit also includes a second fairing cap; the second fairing cap includes a second avoidance portion, a second sealing portion and a second fixing portion; the second avoidance portion, the second sealing portion and the second fixing portion are integrally formed and connected; the second sealing portion is located between the second avoidance portion and the second fixing portion; the second sealing portion is interference fit with the buffer shell; the second fixing portion and the buffer shell are detachably connected; a limiting shoulder is provided at the end of the third buffer chamber near the oil outlet; the throttle plate is clamped between the limiting shoulder and the second avoidance portion; a second avoidance chamber is provided between the second avoidance portion and the buffer shell; the second avoidance chamber is connected to the oil outlet; the second avoidance portion is hollow; a second connecting hole is provided on the second avoidance portion; the inner cavity of the second avoidance portion is connected to the second avoidance chamber through the second connecting hole; the inner cavity of the second avoidance portion and the third buffer chamber are connected through the throttle hole.

7. A low-pressure pulsating hydraulic pump flow distribution mechanism according to claim 6, characterized in that: In the length direction of the third buffer cavity, the distance from the connecting part of the second buffer cavity and the third buffer cavity to the throttle plate is a first distance, and the distance from the end of the third buffer cavity away from the throttle plate to the throttle plate is a second distance; the ratio of the first distance to the second distance is 0.15~0.

3.

8. The low-pressure pulsating hydraulic pump flow distribution mechanism according to claim 3, characterized in that: The buffer chamber also includes a third buffer chamber and a second through hole; the third buffer chamber is connected to the second buffer chamber through the second through hole; the diameter of the second through hole is smaller than the diameter of the second buffer chamber; the diameter of the second through hole is smaller than the diameter of the third buffer chamber; the second buffer chamber is connected to the oil outlet through the third buffer chamber; the diameter of the oil outlet is smaller than the diameter of the third buffer chamber.

9. A low-pressure pulsating hydraulic pump flow distribution mechanism according to claim 8, characterized in that: A diameter of the first through hole is smaller than a diameter of the second through hole.

10. A hydraulic pump, characterized in that: The hydraulic pump comprises: The low-pressure pulsating hydraulic pump flow distribution mechanism according to any one of claims 1 to 9; A housing, wherein the low-pressure pulsating hydraulic pump distribution mechanism is located in the housing; the low-pressure pulsating hydraulic pump distribution mechanism is detachably connected to the housing; The rotor is located in the housing; the rotor is rotatably connected to the housing; the rotor is coaxial with the distribution plate; the rotation direction of the rotor is the direction in which the oil suction area, the boost transition area, the oil discharge area, and the pressure reduction transition area are arranged in sequence.

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