A multi-row high-pressure radial piston pump

Abstract

The present invention provides a multi-row high-pressure radial piston pump, which relates to the technical field of hydraulic pump equipment. The present invention includes a housing, a plurality of distribution end covers, a plurality of one-way valves, a plurality of lubricating distribution plates, an eccentric main shaft rotatably arranged on the housing, a plurality of plungers, rubber sleeves and plunger sleeves corresponding to the plungers one by one, bearing pressure plates and end covers assembled at both ends of the housing; wherein, an eccentric main shaft cavity, a plurality of sleeve cavities, a plurality of inlet distribution channels and outlet distribution channels respectively located at both ends of the housing and distributed along the radial plane are provided in the housing; the axial center structure of the eccentric main shaft is an eccentric wheel, and a star wheel is provided on the eccentric wheel, the inner hole wall of the star wheel is a cylindrical surface, and the outer wall is a regular polygonal cylindrical surface; the eccentric main shaft is indirectly connected to the corresponding plunger through the star wheel transmission. The present invention realizes the isolation of oil-water medium, can improve volumetric efficiency while reducing leakage, and adopts fluid forced lubrication to reduce product wear.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pump equipment, and in particular to a multi-row high-pressure radial piston pump. Background Art

[0002] The plunger pump is an important hydraulic device, which is divided into two types: axial piston pump and radial piston pump. Compared with other types of pumps, it is more pressure-resistant, impact-resistant and more efficient. Its working principle is that the plunger reciprocates in the cylinder, and the closed cavity space composed of the plunger, cylinder, and distribution parts changes to achieve oil suction and discharge.

[0003] At present, most radial piston pumps are realized by shaft rotation and several piston combinations. The radial size of this pump is large. Moreover, the parts of the piston pump are prone to wear under long-term high-speed operation, resulting in oil leakage and reduced life of related parts. In addition, due to the influence of the arrangement of multiple piston combinations, it is difficult to reasonably design a variety of displacement solutions, which easily makes the product volume too large and the volume ratio low.

[0004] In view of this, the applicant filed this application after studying the existing technology. Summary of the invention

[0005] The present invention aims to provide a multi-row high-pressure radial piston pump to solve at least one of the above problems.

[0006] In order to solve the above technical problems, the present invention is implemented through the following technical solutions:

[0007] A multi-row high-pressure radial piston pump comprises: a housing, a plurality of distribution end covers, a plurality of one-way valves, a plurality of lubricating distribution plates, an eccentric main shaft rotatably arranged on the housing, a plurality of plungers, rubber sleeves and plunger sleeves corresponding to the plungers, bearing pressure plates and end covers assembled at both ends of the housing; wherein,

[0008] The shell is provided with an eccentric main shaft cavity, a plurality of sleeve cavities, a plurality of inlet flow distribution channels and outlet flow distribution channels respectively located at both ends of the shell and distributed along the radial plane, an integrated inlet flow channel and a plurality of one-way valve inlet flow channels corresponding to and communicating with the inlet flow distribution channels one by one, an integrated outlet flow channel and a plurality of one-way valve outlet flow channels corresponding to and communicating with the outlet flow distribution channels one by one, and a shell drain hole;

[0009] The integrated inlet channel is connected to the low-pressure main port, which is connected to the low-pressure oil tank; the integrated outlet channel is connected to the high-pressure main port, which is connected to the high-pressure oil tank or the hydraulic load; the eccentric main shaft is rotatably mounted in the eccentric main shaft cavity through a bearing;

[0010] The axial center structure of the eccentric main shaft is an eccentric wheel, on which a star wheel is arranged, the inner hole wall of the star wheel is a cylindrical surface, and the outer wall is a regular polygonal cylinder;

[0011] Splines are arranged outside the two ends of the eccentric wheel, and the detachable eccentric wheel is connected through the splines, and the detachable eccentric wheel is provided with a star wheel; the eccentric main shaft is indirectly connected to the corresponding plunger through the star wheel transmission.

[0012] Preferably, the lubricating manifold is provided with a plurality of plunger sleeve holes, a plunger sleeve positioning surface, a plurality of one-way valve inlet holes, a plurality of one-way valve outlet holes and a lubricating flow channel; the plunger sleeve hole is coaxially assembled with the corresponding sleeve cavity circle center;

[0013] The single one-way valve inlet hole, the plunger sleeve hole and the one-way valve outlet hole are respectively taken as a group of flow distribution structures; a section position line passing through the center of the flow distribution structure is defined as CC, and CC forms an angle with the vertical control line of the plunger sleeve hole in the flow distribution structure;

[0014] The one-way valve inlet hole is communicated with the corresponding one-way valve inlet channel, and the one-way valve outlet hole is communicated with the corresponding one-way valve outlet channel; the plunger sleeve hole is provided with the lubrication channel along the circumferential direction, and the lubrication channel is connected through a circular hole structure, the circular hole structure is a part of the lubrication channel, and the lubrication channel includes a lubrication distribution main port provided by the circular hole structure at one end of the lubrication distribution plate for introducing lubrication fluid.

[0015] Preferably, the distribution end cover is provided with a plurality of end cover grooves, a plurality of inlet holes, a plurality of outlet holes, a plurality of main holes, a plurality of through holes, a plurality of inlet check valve chambers and a plurality of outlet check valve chambers; an end cover positioning ring is provided on the end cover groove; two adjacent end cover grooves are connected to each other, and the horizontal cross-section formed is a plurality of numbers and sizes of perfect circular figures intersecting in sequence along the axial direction, and the overlapping parts of the arc edges are removed.

[0016] Preferably, the one-way valve comprises a one-way valve inlet hole, a valve cap, a valve body, a valve core and a plurality of obliquely penetrating valve core holes arranged thereon, a one-way valve spring and a one-way valve outlet hole;

[0017] The valve core is affected by the combined force of the fluid at the upper and lower ends and the one-way valve spring. When the combined force is directed toward the one-way valve outlet, the valve core is opened, and the fluid at the inlet and outlet ends of the one-way valve is connected. When the combined force is directed away from the one-way valve outlet, the valve core is closed, and the fluid at the inlet and outlet ends of the one-way valve is disconnected.

[0018] The one-way valve is used to control the opening and closing of the holes at both ends thereof, control the inflow function of the fluid into the rubber sleeve, and control the outflow function of the fluid discharged from the rubber sleeve; specifically:

[0019] When the one-way valve inlet hole is placed close to the one-way valve flow inlet hole, the one-way valve assumes the flow inlet function, that is, after the valve core is opened, the fluid enters the one-way valve inlet hole and flows out from the one-way valve outlet hole. At this time, the one-way valve flow inlet hole and the flow inlet hole change from a disconnected state to a connected state, and the fluid enters the rubber sleeve under the action of the pressure difference;

[0020] When the one-way valve outlet hole is placed close to the one-way valve flow outlet hole, the one-way valve assumes the flow outlet function, that is, after the valve core is opened, the fluid enters the one-way valve inlet hole and flows out from the one-way valve outlet hole. At this time, the flow outlet hole and the one-way valve flow outlet hole change from a disconnected state to a connected state, and the fluid is discharged from the rubber sleeve under the action of the pressure difference.

[0021] Preferably, the end cover groove corresponds one-to-one with the main flow hole and is connected, the inlet hole corresponds one-to-one with the inlet hole of the one-way valve and is controlled and connected by the one-way valve, the outlet hole corresponds one-to-one with the outlet hole of the one-way valve and is controlled and connected by the one-way valve, and the inlet hole, the outlet hole and the main flow hole are connected by a through hole.

[0022] Preferably, the eccentric main shaft cavity of the housing is coaxially assembled with the center of the eccentric main shaft; the rotation center of the detachable eccentric wheel is coaxial with the eccentric main shaft, and the eccentric wheel is separated from the eccentric main shaft by a phase difference θ in the radial direction and assembled at a certain distance in the axial direction, and both are provided with sleeved star wheels, so that the eccentric main shaft indirectly drives the plunger; wherein the calculation method of the phase difference θ is:

[0023] θ = 360 / n;

[0024] Where n is the number of plunger rows used.

[0025] Preferably, the lubrication distribution plate is mounted on the housing, and the plunger sleeve hole is coaxially aligned with the corresponding sleeve cavity; the plunger sleeve is assembled into the corresponding plunger sleeve hole and sleeve cavity along the axis;

[0026] The plunger sleeve includes an outer annular bottom surface and is arranged on the plunger sleeve positioning surface, and the distribution end cover is assembled on the lubricating distribution plate; the lubricating distribution plate is provided with a distribution groove, and the corresponding plunger sleeve is sealed downward along the axis, and together with the plunger sleeve positioning surface, the axial movement of the plunger sleeve is limited; the plunger sleeves are closely arranged along the axial direction of the eccentric main shaft, and the plunger sleeve located in the middle position is subjected to a special structural treatment; wherein, the special structural treatment is: removing the overlapping arc parts of the plunger sleeve and other plunger sleeves at both ends, so that the center distance of adjacent plunger sleeves is smaller than their own diameters.

[0027] Preferably, the bottom surface of the plunger is placed on the wheel surface of the star wheel, and an annular guide belt is installed at a circumferential position away from the bottom surface; the annular guide belt cooperates with the inner cavity wall surface of the plunger sleeve, so that the plunger can perform reciprocating linear motion along the axis in the inner cavity of the plunger sleeve;

[0028] The rubber sleeve is mounted in the inner cavity of the plunger sleeve, and the upper and lower end surfaces of the rubber sleeve are respectively in close contact with the distribution end cover and the plunger;

[0029] A round hole is arranged at the bottom of the rubber sleeve, and the plunger comprises a threaded rod structure. The threaded rod of the plunger is inserted into the round hole at the bottom of the rubber sleeve and then enters the inner cavity thereof. A spring seat is placed at the bottom of the inner cavity of the rubber sleeve, and a pair of anti-loosening nuts are arranged on the spring seat. The threaded rod is screwed in and then the spring seat is pressed to realize an integrated connection between the plunger and the rubber sleeve.

[0030] A return spring is placed on the spring seat. The return spring can move elastically between the spring seat and the distribution end cover, and its part close to the distribution end cover is tightly against the end cover positioning ring to prevent it from tilting during movement.

[0031] Preferably, the rubber sleeve comprises a flange structure, the rounded corner transition of the flange structure is closely attached to the rounded corner structure corresponding to an annular shoulder; the bottom of the annular shoulder is placed on an inner annular bottom surface in the plunger sleeve to achieve a supporting effect;

[0032] A pressure ring is placed between the upper plane of the flange structure and the distribution end cover 1, and the inner wall of the pressure ring is in close contact with the outer circumferential surface of the rubber sleeve. The pressure ring, the annular shoulder and the end cover positioning ring jointly realize the fixing effect of the rubber sleeve;

[0033] The length of the rubber sleeve is set to the position length when the corresponding plunger is in the lower top position, so that the rubber sleeve still retains the minimum deformation amount to apply a certain pre-tightening force to the plunger, so that the corresponding plunger bottom is always in close contact with the wheel surface of the star wheel; when the eccentric main shaft rotates, it drives the star wheel to move, and then drives the plunger to make it displace along its own axial direction; then with the rotation of the eccentric main shaft, the plunger performs a reciprocating linear motion in the plunger sleeve to compress the rubber sleeve; the rubber sleeve is integrally connected to the plunger, and the elastic deformation degree changes with the reciprocating motion of the plunger. When the plunger moves from the lower bottom position to the upper top position, the compression amount of the return spring increases and the restoring force accumulates, the compression deformation amount of the rubber sleeve increases, the inner cavity volume decreases and the pressure increases; when the plunger moves from the upper top position to the lower bottom position, under the combined action of the plunger stroke change and the restoring force of the return spring, the compression deformation amount of the rubber sleeve decreases, and its inner cavity volume increases and the pressure decreases;

[0034] The plunger sleeve is provided with a lubrication flow hole, which is horizontally aligned with and connected to the center of the lubrication flow channel; the rubber sleeve and the corresponding plunger sleeve, annular shoulder, and annular guide belt form a corresponding lubrication cavity, and lubricating liquid is pumped from the outside of the lubrication distribution plate to enter the lubrication cavity through the lubrication flow channel and the lubrication flow hole, and then forced to lubricate the outer circumferential wall surface of the rubber sleeve; the lubricating liquid naturally leaks into the eccentric main shaft cavity.

[0035] Preferably, when the eccentric main shaft rotates, the eccentric wheel structure and the assembled detachable eccentric wheel jointly drive the corresponding star wheel to move, and then drive the corresponding plunger to make it reciprocating linear motion in the plunger sleeve; the rubber sleeve changes its compression amount under the movement of the plunger, and when the plunger moves from the upper top position to the lower bottom position, under the joint action of the stroke change of the plunger and the restoring force of the return spring, the compression deformation of the rubber sleeve decreases, the volume of its inner cavity increases and the pressure decreases, and the flow direction of the low-pressure fluid outside the cavity along the pressure gradient is: low-pressure oil tank, low-pressure main port, integrated inlet channel, inlet distribution channel, one-way valve inlet channel, one-way valve inlet hole, one-way valve, inlet hole, through hole, main flow hole, rubber sleeve, that is, a low-pressure fluid suction process is completed;

[0036] When the plunger moves from the lower bottom position to the upper top position, the compression amount of the return spring increases and the restoring force is accumulated under the change of the stroke of the plunger, the compression deformation amount of the rubber sleeve increases, the volume of its inner cavity decreases and the pressure increases, and the flow direction of the high-pressure fluid contained in the inner cavity along the pressure gradient is: rubber sleeve, main flow hole, through hole, outflow hole, one-way valve, one-way valve outflow hole, one-way valve outflow channel, outlet distribution channel, integrated outflow channel, high-pressure main port, high-pressure oil tank or hydraulic load, that is, a high-pressure fluid discharge process is completed; the fluid suction and discharge process is repeated to convert mechanical energy into hydraulic energy.

[0037] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0038] The rubber sleeve and plunger sleeve used in the present invention form an integrated flexible rubber sleeve cavity, which is easy to assemble and disassemble, realizes the isolation of oil and water media, and improves the volumetric efficiency while reducing the leakage.

[0039] The present invention arranges a polygonal star wheel component on the eccentric wheel so that the eccentric main shaft indirectly drives the plunger to realize plunger transmission; and introduces lubricating fluid by designing a fluid flow channel so that the fluid is forced to lubricate the rubber sleeve under the action of pressure difference, thereby reducing the wear of product components and increasing the life of related components.

[0040] The present invention adopts a special inclined angle flow distribution method to design the flow channel, and designs the eccentric wheels to be assembled at a phase difference in the radial direction and a certain distance in the axial direction, thereby realizing compact assembly of the overall structure, so that multiple rows of plungers can be installed within a reasonable size range, and the linkage ensures stable flow output. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 The figure is a schematic diagram of the explosion structure of a multi-row high-pressure radial piston pump involved in an embodiment of the present invention.

[0043] Figure 2 The present invention is a schematic partial axial cross-sectional view of a multi-row high-pressure radial piston pump according to an embodiment of the present invention.

[0044] Figure 3 It is a partial cross-sectional schematic diagram of the flow distribution of a one-way valve of a multi-row high-pressure radial piston pump involved in an embodiment of the present invention.

[0045] Figure 4 The present invention is a schematic axial cross-sectional view of a housing of a multi-row high-pressure radial piston pump according to an embodiment of the present invention.

[0046] Figure 5 It is a schematic cross-sectional view along the AA direction of the shell involved in the embodiment of the present invention.

[0047] Figure 6 It is a cross-sectional schematic diagram along the BB direction of the shell involved in the embodiment of the present invention.

[0048] Figure 7 The present invention is a top view schematically showing the assembly of a distribution end cover and a lubrication distribution plate of a multi-row high-pressure radial piston pump according to an embodiment of the present invention.

[0049] Figure 8 The present invention is a cross-sectional schematic diagram in the CC direction of a multi-row high-pressure radial piston pump when a distribution end cover and a lubrication distribution plate are assembled.

[0050] Fig. 9 The present invention is a schematic radial cross-sectional view of a multi-row high-pressure radial piston pump according to an embodiment of the present invention.

[0051] Reference numerals: distribution end cover 1, one-way valve 2, lubrication distribution plate 3, housing 4, eccentric main shaft 5, bearing 6, star wheel 7, eccentric wheel 8, plunger sleeve 9, rubber sleeve 10, plunger 11, bearing pressure plate 12, end cover 13;

[0052] Eccentric main shaft cavity 20, sleeve cavity 21, inlet flow distribution channel 22, outlet flow distribution channel 23, integrated inlet flow channel 24, integrated outlet flow channel 25, one-way valve inlet flow channel 26, one-way valve outlet flow channel 27, shell drain hole 28;

[0053] A plunger sleeve hole 30, a plunger sleeve positioning surface 31, a plurality of one-way valve inlet holes 32, a plurality of one-way valve outlet holes 33, and a lubrication flow channel 34;

[0054] An end cover groove 40, a plurality of inlet holes 41, a plurality of outlet holes 42, a plurality of main flow holes 43, a plurality of through holes 44, a plurality of inlet check valve cavities 45, a plurality of outlet check valve cavities 46, and an end cover positioning ring 47;

[0055] Annular guide belt 50, spring seat 51, nut 52, return spring 53;

[0056] Lubricating flow hole 60, inner annular bottom surface 61, annular shoulder 62, flange structure 63, pressure ring 64, outer annular bottom surface 65;

[0057] One-way valve inlet hole 70 , valve cap 71 , valve body 72 , valve core 73 , valve core hole 74 , one-way valve spring 75 , one-way valve outlet hole 76 .

[0058] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0060] Combination Figures 1 to 3As shown, this embodiment provides a multi-row high-pressure radial piston hydraulic pump device, including a housing 4, a plurality of distribution end covers 1, a plurality of lubricating distribution plates 3, a plurality of one-way valves 2, a plurality of plungers 11, an eccentric main shaft 5 rotatably arranged on the housing 4, a rubber sleeve 10 and a plunger sleeve 9 corresponding to the plungers 11 one by one, a bearing pressure plate 12 assembled at both ends of the housing 4, and an end cover 13.

[0061] Specifically, the axial center structure of the eccentric main shaft 5 is an eccentric wheel, on which a star wheel 7 is arranged, the inner hole wall of the star wheel 7 is a cylindrical surface, and the outer wall is a regular polygonal cylinder; external splines are arranged at both ends of the eccentric wheel, and a detachable eccentric wheel 8 is connected through the spline, and a star wheel 7 is arranged on the detachable eccentric wheel 8; the eccentric main shaft 5 is indirectly connected to all corresponding plungers 11 through each of the star wheels 7.

[0062] Combination Figures 4 to 6 As shown, the shell is provided with an eccentric main shaft cavity 20, a plurality of sleeve cavities 21, a plurality of inlet flow distribution channels 22 and outlet flow distribution channels 23 respectively located at both ends of the shell and distributed along the radial plane, an integrated inlet flow channel 24 and a plurality of one-way valve inlet flow channels 26 corresponding to and communicating with the inlet flow distribution channels 22, an integrated outlet flow channel 25 and a plurality of one-way valve outlet flow channels 27 corresponding to and communicating with the outlet flow distribution channels 23, and a shell drain hole 28; the integrated inlet flow channel 24 is communicated with the low-pressure main port, and the low-pressure main port is connected to the low-pressure oil tank (not shown in the figure); the integrated outlet flow channel 25 is communicated with the high-pressure main port, and the high-pressure main port is connected to the high-pressure oil tank or the hydraulic load (not shown in the figure); the eccentric main shaft 5 is rotatably mounted in the eccentric main shaft cavity 20 through the bearing 6.

[0063] Combination Figure 7 and 8 As shown, in another preferred embodiment, the lubricating distribution plate 3 is provided with a plurality of plunger sleeve holes 30, a plunger sleeve positioning surface 31, a plurality of one-way valve inlet holes 32, a plurality of one-way valve outlet holes 33, and a lubrication flow channel 34; the plunger sleeve hole 30 is coaxially assembled with the center of the corresponding sleeve cavity 21.

[0064] Specifically, a single one-way valve inlet hole 32, a plunger sleeve hole 30 and a one-way valve outlet hole 33 are respectively taken as a group of distribution structures, and a section position line CC passing through the center of the three circles is taken as an example, CC forms an appropriate angle with the vertical control line of the plunger sleeve hole 30 in the group of distribution structures. The one-way valve inlet hole 32 is connected to the corresponding one-way valve inlet channel 26, and the one-way valve outlet hole 33 is connected to the corresponding one-way valve outlet channel 27; each of the plunger sleeve holes 30 is provided with the lubrication flow channel 34 along the circumferential direction, and each of the lubrication flow channels 34 is connected through a circular hole structure, which is also regarded as a part of the lubrication flow channel 34, and the lubrication flow channel 34 includes a lubrication distribution main port provided at one end of the lubrication distribution plate 3 to introduce lubrication fluid.

[0065] Combination Figure 8 As shown, in another preferred embodiment, the distribution end cover 1 is provided with a plurality of end cover grooves 40, a plurality of inlet holes 41, a plurality of outlet holes 42, a plurality of main holes 43, a plurality of through holes 44, a plurality of inlet check valve cavities 45, and a plurality of outlet check valve cavities 46; each of the end cover grooves 40 is provided with an end cover positioning ring 47; adjacent end cover grooves 40 are communicated with each other, and the horizontal cross-section formed by them can be regarded as a perfect circular figure of an appropriate number and size intersecting in sequence along the axial direction and removing the overlapping parts of the arc edges.

[0066] Combination Figure 2 and Figure 3 As shown, specifically, the one-way valve 2 includes a one-way valve inlet hole 70, a valve cap 71, a valve body 72, a valve core 73 and a plurality of obliquely penetrating valve core holes 74 arranged thereon, a one-way valve spring 75, and a one-way valve outlet hole 76.

[0067] The valve core 73 is affected by the combined force of the fluid at the upper and lower ends and the one-way valve spring 75. When the direction of the combined force points to the one-way valve outlet 76, the valve core 73 opens, and the fluid at the inlet and outlet ends of the one-way valve 2 is connected. When the direction of the combined force deviates from the one-way valve outlet 76, the valve core 73 is closed, and the fluid at the inlet and outlet ends of the one-way valve 2 is disconnected.

[0068] In this embodiment, the one-way valve 2 is used to control the opening and closing of the holes at both ends thereof, and its functions can be divided into the inflow function of controlling the fluid entering the rubber sleeve 10 and the outflow function of controlling the fluid being discharged from the rubber sleeve 10. The implementation method is as follows:

[0069] When the one-way valve inlet hole 70 is placed close to the one-way valve inlet hole 32, the one-way valve 2 assumes the inlet function, that is, after the valve core 73 is opened, the fluid enters the one-way valve inlet hole 70 and flows out from the one-way valve outlet hole 76. At this time, the one-way valve inlet hole 32 and the inlet hole 41 are changed from a disconnected state to a connected state, and the fluid can enter the rubber sleeve 10 under the action of the pressure difference;

[0070] When the one-way valve outlet hole 76 is placed close to the one-way valve outlet hole 33, the one-way valve 2 assumes the outflow function, that is, after the valve core 73 is opened, the fluid enters the one-way valve inlet hole 70 and flows out from the one-way valve outlet hole 76. At this time, the outlet hole 42 and the one-way valve outlet hole 33 change from a disconnected state to a connected state, and the fluid can be discharged from the rubber sleeve 10 under the action of the pressure difference.

[0071] Specifically, the end cover groove 40 corresponds one-to-one to and is connected with the main flow hole 43, the inlet hole 41 corresponds one-to-one to the one-way valve inlet hole 32 and is controlled and connected by the one-way valve 2, the outlet hole 42 corresponds one-to-one to the one-way valve outlet hole 33 and is controlled and connected by the one-way valve 2, and the inlet hole 41, the outlet hole 42 and the main flow hole 43 are connected by a through hole 44.

[0072] In another preferred embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the eccentric main shaft cavity 20 of the housing 4 is coaxially assembled with the center of the eccentric main shaft 5, the rotation center of the detachable eccentric wheel 8 is coaxial with the eccentric main shaft 5, and it is assembled with an appropriate phase difference θ in the radial direction and an appropriate distance in the axial direction relative to the eccentric wheel of the eccentric main shaft 5, and both are provided with a sleeved star wheel 7 to enable the eccentric main shaft 5 to indirectly drive the plunger 11.

[0073] Specifically, the calculation method of the "appropriate phase difference θ" is: θ=360 / n, where n is the number of rows of plungers used.

[0074] Combination Fig. 9 The radial cross-sectional structure of the radial piston pump shown in the figure, in another preferred embodiment, the star wheel 7 and the eccentric wheel 8 can be connected by a rolling bearing or a sliding bearing, which is not limited here.

[0075] In another preferred embodiment, the lubricating distribution plate 3 is assembled on the housing 4, and each of the plunger sleeve holes 30 is coaxially aligned with the corresponding sleeve cavity 21; each of the plunger sleeves 9 is assembled into the corresponding plunger sleeve hole 30 and the sleeve cavity 21 along the axis; the plunger sleeve 9 includes an outer annular bottom surface 65, which is arranged on the plunger sleeve positioning surface 31, and the distribution end cover 1 is assembled on the lubricating distribution plate 3, and each of the distribution grooves 40 covers each corresponding plunger sleeve 9 downward along the axis, and together with the plunger sleeve positioning surface 31, limits the axial movement of the plunger sleeve 9; the plunger sleeves 9 are closely arranged along the axial direction of the eccentric main shaft 5, and the plunger sleeve 9 located in the middle position is specially structured, that is, the overlapping arc parts with other plunger sleeves 9 at both ends are removed, so that the center distance between adjacent plunger sleeves 9 is appropriately smaller than its own diameter.

[0076] like Figure 2As shown, specifically, the bottom surface of the plunger 11 is placed at an appropriate position on the wheel surface of the star wheel 7, and an annular guide belt 50 is installed at an appropriate circumferential position away from the bottom surface. The annular guide belt 50 cooperates with the inner cavity wall of the plunger sleeve 9, so that the plunger 11 can perform reciprocating linear motion along the axis in the inner cavity of the plunger sleeve 9.

[0077] The rubber sleeve 10 is assembled in the inner cavity of the plunger sleeve 9, and the upper and lower end surfaces are respectively in close contact with the distribution end cover 1 and the plunger 11; a round hole is arranged at the bottom of the rubber sleeve 10, and the plunger 11 comprises a threaded rod structure, and the threaded rod of the plunger 11 enters its inner cavity after being inserted into the round hole at the bottom of the rubber sleeve 10, and a spring seat 51 is placed at the bottom of the inner cavity of the rubber sleeve 10, on which a pair of anti-loosening nuts 52 are arranged, which are screwed into the threaded rod and then press the spring seat 51 to realize the integrated connection between the plunger 11 and the rubber sleeve 10; a return spring 53 is placed on the spring seat 51, and the return spring 53 can move elastically between the spring seat 51 and the distribution end cover 1, and its part close to the distribution end cover 1 is in close contact with the end cover positioning ring 47 to prevent it from tilting during movement.

[0078] like Figure 3 As shown, specifically, in another preferred embodiment, the rubber sleeve 10 includes a flange structure 63, the fillet transition of the flange structure 63 is tightly attached to the fillet structure corresponding to an annular shoulder 62, and the bottom of the annular shoulder 62 is placed on an inner annular bottom surface 61 in the plunger sleeve 9 to achieve a supporting effect; a pressure ring 64 is placed between the upper plane of the flange structure 63 and the distribution end cover 1, and the inner wall of the pressure ring 64 is tightly attached to the outer circumferential surface of the rubber sleeve 10, and the pressure ring 64, the annular shoulder 62 and the end cover positioning ring 47 jointly achieve the fixing effect of the rubber sleeve 10.

[0079] like Figure 2As shown, the length of each rubber sleeve 10 is set so that when the corresponding plunger 11 is in the lower top position, the rubber sleeve 10 still has a minimum deformation amount to apply a certain pre-tightening force to the plunger 11, so that the bottom of each corresponding plunger 11 is always in close contact with the wheel surface of the star wheel 7. When the eccentric main shaft 5 rotates, it drives the star wheel 7 to move, and then drives the plunger 11 to make it displace along its own axial direction. Then, as the eccentric main shaft 5 rotates, the plunger 11 performs a reciprocating linear motion of compressing the rubber sleeve 10 in the plunger sleeve 9. The rubber sleeve 10 is integrally connected with the plunger 11, and the elastic deformation degree changes with the reciprocating motion of the plunger 11. When the plunger 11 moves from the lower bottom position to the upper top position, the compression amount of the reset spring 53 increases and the restoring force is accumulated, the compression deformation amount of the rubber sleeve 10 increases, the volume of the inner cavity decreases, and the pressure increases. When the plunger 11 moves from the upper top position to the lower bottom position, under the combined effect of the stroke change of the plunger 11 and the restoring force of the return spring 53, the compression deformation of the rubber sleeve 10 decreases, the volume of its inner cavity increases and the pressure decreases.

[0080] Specifically, the plunger sleeve 9 is provided with a lubrication flow hole 60, and the lubrication flow hole 60 is horizontally aligned with and connected to the center of the lubrication flow channel 34; each of the rubber sleeves 10 forms a corresponding lubrication cavity with the corresponding plunger sleeve 9, the annular shoulder 62, and the annular guide belt 50, and the lubricating liquid is pumped from the outside of the lubrication distribution plate 3 so that it enters the lubrication cavity through the lubrication flow channel 34 and the lubrication flow hole 60 to force lubricate the outer circumferential wall surface of the rubber sleeve 10; the lubricating liquid naturally leaks into the eccentric main shaft cavity 20.

[0081] Specifically, the specific working principle of the multi-row high-pressure radial piston pump is:

[0082] When the eccentric main shaft 5 rotates, the corresponding star wheel 7 is driven to move through the eccentric wheel structure and the detachable eccentric wheel 8 assembled thereon, and then the corresponding plunger 11 is driven to make a reciprocating linear motion in the plunger sleeve 9; the rubber sleeve 10 changes its compression amount under the movement of the plunger 11. When the plunger 11 moves from the upper top position to the lower bottom position, under the combined action of the stroke change of the plunger 11 and the restoring force of the return spring 53, the compression deformation of the rubber sleeve 10 is reduced, the volume of its inner cavity is increased and the pressure is reduced, and the flow direction of the low-pressure fluid outside the cavity along the pressure gradient is low-pressure oil tank → low-pressure main port → integrated inlet channel 24 → inlet distribution channel 22 → one-way valve inlet channel 26 → one-way valve inlet hole 32 → one-way valve 2 → inlet hole 41 → through hole 44 → main flow hole 43 → rubber sleeve 10, that is, a low-pressure fluid suction process is completed.

[0083] When the plunger 11 moves from the lower bottom position to the upper top position, the compression amount of the return spring pressure 53 increases and the restoring force is accumulated under the change of the stroke of the plunger 11, the compression deformation amount of the rubber sleeve 10 increases, the volume of its inner cavity decreases and the pressure increases, and the flow direction of the high-pressure fluid contained in the inner cavity along the pressure gradient is rubber sleeve 10→main flow hole 43→through hole 44→outflow hole 42→one-way valve 2→one-way valve outflow hole 33→one-way valve outflow channel 27→outlet distribution channel 23→integrated outflow channel 25→high-pressure main port→high-pressure oil tank or hydraulic load, that is, a high-pressure fluid discharge process is completed; the fluid suction and discharge process is repeated to convert mechanical energy into hydraulic energy.

[0084] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0085] The present invention adopts an easily disassembled integrated flexible rubber sleeve cavity to achieve oil-water medium isolation, reduce leakage and improve volumetric efficiency; the present invention adopts a polygonal star wheel component to achieve plunger transmission, and adopts fluid forced lubrication to reduce wear, so as to increase the life of related components; at the same time, a special inclined angle flow distribution method is adopted to design the flow channel, so as to achieve compact assembly of the overall structure, so as to install multiple rows of plungers in linkage within a reasonable size range to ensure smooth flow output.

[0086] In several embodiments provided in the embodiments of the present invention, it should be understood that the disclosed apparatus and method can also be implemented in other ways. The apparatus and method embodiments described above are merely schematic. For example, the flowcharts in the accompanying drawings show the possible architecture, functions and operations of the apparatus, method and computer program product according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0087] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0088] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, an electronic device, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code. It should be noted that in this article, the term "include", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. Without more constraints, an element defined by the phrase "comprising a..." does not exclude the existence of other identical elements in the process, method, article or apparatus comprising the element.

[0089] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0090] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0091] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0092] The "first\second" mentioned in the embodiments is only to distinguish similar objects, and does not represent a specific order for the objects. It is understandable that the "first\second" can be interchanged with the specific order or sequence where permitted. It should be understood that the objects distinguished by "first\second" can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than those illustrated or described herein.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-row high-pressure radial piston pump, characterized in that: include: A housing, a plurality of distribution end covers, a plurality of one-way valves, a plurality of lubricating distribution plates, an eccentric main shaft rotatably arranged on the housing, a plurality of plungers, rubber sleeves and plunger sleeves corresponding to the plungers, bearing pressure plates and end covers assembled at both ends of the housing; wherein, The shell is provided with an eccentric main shaft cavity, a plurality of sleeve cavities, a plurality of inlet flow distribution channels and outlet flow distribution channels respectively located at both ends of the shell and distributed along the radial plane, an integrated inlet flow channel and a plurality of one-way valve inlet flow channels corresponding to and communicating with the inlet flow distribution channels one by one, an integrated outlet flow channel and a plurality of one-way valve outlet flow channels corresponding to and communicating with the outlet flow distribution channels one by one, and a shell drain hole; The integrated inlet channel is connected to the low-pressure main port, which is connected to the low-pressure oil tank; the integrated outlet channel is connected to the high-pressure main port, which is connected to the high-pressure oil tank or the hydraulic load; the eccentric main shaft is rotatably mounted in the eccentric main shaft cavity through bearings at both ends; The axial center structure of the eccentric main shaft is an eccentric wheel, on which a star wheel is arranged, the inner hole wall of the star wheel is a cylindrical surface, and the outer wall is a regular polygonal cylinder; Splines are provided on the outside of both ends of the eccentric wheel, and the detachable eccentric wheel is connected through the splines, and the detachable eccentric wheel is provided with a star wheel; the eccentric main shaft is indirectly connected to the corresponding plunger through the star wheel transmission; The lubricating manifold is provided with a plurality of plunger sleeve holes, a plunger sleeve positioning surface, a plurality of one-way valve inlet holes, a plurality of one-way valve outlet holes and a lubricating flow channel; the plunger sleeve hole is coaxially assembled with the corresponding sleeve cavity circle center; The single one-way valve inlet hole, the plunger sleeve hole and the one-way valve outlet hole are respectively taken as a group of flow distribution structures; a section position line passing through the center of the flow distribution structure is defined as CC, and CC forms an angle with the vertical control line of the plunger sleeve hole in the flow distribution structure; The one-way valve inlet hole is communicated with the corresponding one-way valve inlet channel, and the one-way valve outlet hole is communicated with the corresponding one-way valve outlet channel; the plunger sleeve hole is provided with the lubrication channel along the circumferential direction, and the lubrication channel is connected through a circular hole structure, the circular hole structure is a part of the lubrication channel, and the lubrication channel includes a lubrication distribution main port provided by the circular hole structure at one end of the lubrication distribution plate for introducing lubrication fluid.

2. A multi-row high-pressure radial piston pump according to claim 1, characterized in that The distribution end cover is provided with a plurality of end cover grooves, a plurality of inlet holes, a plurality of outlet holes, a plurality of main holes, a plurality of through holes, a plurality of inlet check valve chambers and a plurality of outlet check valve chambers; an end cover positioning ring is provided on the end cover groove; two adjacent end cover grooves are connected to each other, and the horizontal cross-section formed is a plurality of numbers and sizes of perfect circular figures intersecting in sequence along the axial direction, and the overlapping parts of the arc edges are removed.

3. A multi-row high-pressure radial piston pump according to claim 2, characterized in that The one-way valve comprises a one-way valve inlet hole, a valve cap, a valve body, a valve core and a plurality of obliquely penetrating valve core holes arranged thereon, a one-way valve spring and a one-way valve outlet hole; The valve core is affected by the combined force of the fluid at the upper and lower ends and the one-way valve spring. When the combined force is directed toward the one-way valve outlet, the valve core is opened, and the fluid at the inlet and outlet ends of the one-way valve is connected. When the combined force is directed away from the one-way valve outlet, the valve core is closed, and the fluid at the inlet and outlet ends of the one-way valve is disconnected. The one-way valve is used to control the opening and closing of the holes at both ends of the one-way valve, control the inflow function of the fluid into the rubber sleeve, and control the outflow function of the fluid discharged from the rubber sleeve; specifically: When the one-way valve inlet hole is placed close to the one-way valve flow inlet hole, the one-way valve assumes the flow inlet function, that is, after the valve core is opened, the fluid enters the one-way valve inlet hole and flows out from the one-way valve outlet hole. At this time, the one-way valve flow inlet hole and the flow inlet hole change from a disconnected state to a connected state, and the fluid enters the rubber sleeve under the action of the pressure difference; When the one-way valve outlet hole is placed close to the one-way valve flow outlet hole, the one-way valve assumes the flow outlet function, that is, after the valve core is opened, the fluid enters the one-way valve inlet hole and flows out from the one-way valve outlet hole. At this time, the flow outlet hole and the one-way valve flow outlet hole change from a disconnected state to a connected state, and the fluid is discharged from the rubber sleeve under the action of the pressure difference.

4. A multi-row high-pressure radial piston pump according to claim 2, characterized in that The end cover groove corresponds one-to-one with the main flow hole and is connected, the inlet hole corresponds one-to-one with the inlet hole of the one-way valve and is controlled and connected by the one-way valve, the outlet hole corresponds one-to-one with the outlet hole of the one-way valve and is controlled and connected by the one-way valve, and the inlet hole, the outlet hole and the main flow hole are connected by a through hole.

5. A multi-row high-pressure radial piston pump according to claim 1, characterized in that The eccentric main shaft cavity of the housing is coaxially assembled with the center of the eccentric main shaft; the rotation center of the detachable eccentric wheel is coaxial with the eccentric main shaft, and the eccentric wheel is separated from the eccentric main shaft by a phase difference θ in the radial direction and a certain distance in the axial direction, and both are provided with a sleeved star wheel so that the eccentric main shaft indirectly drives the plunger; wherein the calculation method of the phase difference θ is: θ = 360 / n; Where n is the number of plunger rows used.

6. A multi-row high-pressure radial piston pump according to claim 4, characterized in that , the lubrication distribution plate is assembled on the housing, and the plunger sleeve hole is coaxially aligned with the corresponding sleeve cavity; the plunger sleeve is assembled into the corresponding plunger sleeve hole and sleeve cavity along the axis; The plunger sleeve includes an outer annular bottom surface and is arranged on the plunger sleeve positioning surface, and the distribution end cover is assembled on the lubricating distribution plate; the lubricating distribution plate is provided with a distribution groove, and the corresponding plunger sleeve is sealed downward along the axis, and together with the plunger sleeve positioning surface, the axial movement of the plunger sleeve is limited; the plunger sleeves are closely arranged along the axial direction of the eccentric main shaft, and the plunger sleeve located in the middle position is subjected to a special structural treatment; wherein, the special structural treatment is: removing the overlapping arc parts of the plunger sleeve and other plunger sleeves at both ends, so that the center distance of adjacent plunger sleeves is smaller than their own diameters.

7. A multi-row high-pressure radial piston pump according to claim 3, characterized in that The bottom surface of the plunger is placed on the wheel surface of the star wheel, and a circular guide belt is installed at a circumferential position away from the bottom surface; the circular guide belt cooperates with the inner cavity wall surface of the plunger sleeve, so that the plunger can perform reciprocating linear motion along the axis in the inner cavity of the plunger sleeve; The rubber sleeve is mounted in the inner cavity of the plunger sleeve, and the upper and lower end surfaces of the rubber sleeve are respectively in close contact with the distribution end cover and the plunger; A round hole is arranged at the bottom of the rubber sleeve, and the plunger comprises a threaded rod structure. The threaded rod of the plunger is inserted into the round hole at the bottom of the rubber sleeve and then enters the inner cavity thereof. A spring seat is placed at the bottom of the inner cavity of the rubber sleeve, and a pair of anti-loosening nuts are arranged on the spring seat. The threaded rod is screwed in and then the spring seat is pressed to realize an integrated connection between the plunger and the rubber sleeve. A return spring is placed on the spring seat. The return spring can move elastically between the spring seat and the distribution end cover, and its part close to the distribution end cover is tightly against the end cover positioning ring to prevent it from tilting during movement.

8. A multi-row high-pressure radial piston pump according to claim 7, characterized in that The rubber sleeve includes a flange structure, the rounded corner transition of the flange structure is tightly attached to the rounded corner structure corresponding to an annular shoulder; the bottom of the annular shoulder is placed on an inner annular bottom surface in the plunger sleeve to achieve a supporting effect; A pressure ring is placed between the upper plane of the flange structure and the distribution end cover, and the inner wall of the pressure ring is in close contact with the outer circumferential surface of the rubber sleeve. The pressure ring, the annular shoulder and the end cover positioning ring jointly realize the fixing effect of the rubber sleeve; The length of the rubber sleeve is set to the position length when the corresponding plunger is in the lower top position, so that the rubber sleeve still retains the minimum deformation amount to apply a certain pre-tightening force to the plunger, so that the corresponding plunger bottom is always in close contact with the wheel surface of the star wheel; when the eccentric main shaft rotates, it drives the star wheel to move, and then drives the plunger to make it displace along its own axial direction; then with the rotation of the eccentric main shaft, the plunger performs a reciprocating linear motion in the plunger sleeve to compress the rubber sleeve; the rubber sleeve is integrally connected to the plunger, and the elastic deformation degree changes with the reciprocating motion of the plunger. When the plunger moves from the lower bottom position to the upper top position, the compression amount of the return spring increases and the restoring force accumulates, the compression deformation amount of the rubber sleeve increases, the inner cavity volume decreases and the pressure increases; when the plunger moves from the upper top position to the lower bottom position, under the combined action of the plunger stroke change and the restoring force of the return spring, the compression deformation amount of the rubber sleeve decreases, and its inner cavity volume increases and the pressure decreases; The plunger sleeve is provided with a lubrication flow hole, which is horizontally aligned with and connected to the center of the lubrication flow channel; the rubber sleeve and the corresponding plunger sleeve, annular shoulder, and annular guide belt form a corresponding lubrication cavity, and lubricating liquid is pumped from the outside of the lubrication distribution plate to enter the lubrication cavity through the lubrication flow channel and the lubrication flow hole, and then forced to lubricate the outer circumferential wall surface of the rubber sleeve; the lubricating liquid naturally leaks into the eccentric main shaft cavity.

9. A multi-row high-pressure radial piston pump according to claim 8, characterized in that When the eccentric main shaft rotates, the eccentric wheel structure and the assembled detachable eccentric wheel jointly drive the corresponding star wheel to move, and then transmit the corresponding plunger to make it reciprocating linear motion in the plunger sleeve; the rubber sleeve changes its compression amount under the movement of the plunger, and when the plunger moves from the upper top position to the lower bottom position, under the joint action of the stroke change of the plunger and the restoring force of the return spring, the compression deformation of the rubber sleeve decreases, the volume of its inner cavity increases and the pressure decreases, and the flow direction of the low-pressure fluid outside the cavity along the pressure gradient is: low-pressure oil tank, low-pressure main port, integrated inlet channel, inlet distribution channel, one-way valve inlet channel, one-way valve inlet hole, one-way valve, inlet hole, through hole, main flow hole, rubber sleeve, that is, a low-pressure fluid suction process is completed; When the plunger moves from the lower bottom position to the upper top position, the compression amount of the return spring increases and the restoring force is accumulated under the change of the stroke of the plunger, the compression deformation amount of the rubber sleeve increases, the volume of its inner cavity decreases and the pressure increases, and the flow direction of the high-pressure fluid contained in the inner cavity along the pressure gradient is: rubber sleeve, main flow hole, through hole, outflow hole, one-way valve, one-way valve outflow hole, one-way valve outflow channel, outlet distribution channel, integrated outflow channel, high-pressure main port, high-pressure oil tank or hydraulic load, that is, a high-pressure fluid discharge process is completed; the fluid suction and discharge process is repeated to convert mechanical energy into hydraulic energy.

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