CN210422901U

CN210422901U - Low-pulsation axial plunger pump with flow adjustable from zero

Info

Publication number: CN210422901U
Application number: CN201921367789.9U
Authority: CN
Inventors: 陈南南
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2020-04-28
Anticipated expiration: 2029-08-22

Abstract

A low-pulsation axial plunger pump with flow adjustable from zero comprises a driving mechanism, a flow control mechanism, a cylinder mechanism and a valve type valve plate mechanism, wherein a driving shaft drives a rotating swash plate seat to rotate, the rotating swash plate seat drives a first swash plate adjusting rod to rotate around the axis of a driving shaft, a swash plate drives a second swash plate adjusting rod to rotate around the axis of the driving shaft, the second swash plate adjusting rod drives a flow control inner ring to rotate, a flow adjusting screw rod is matched with a flow control outer ring through a thread structure, a plunger is installed in the cylinder body, the valve type valve plate is installed on a right shell, a one-way valve core is installed in an oil inlet hole and an oil outlet hole of the valve type valve plate, each guide groove on the cylinder body corresponds to one oil inlet hole and one oil outlet hole, a left shell and a right shell are installed on the shells, and the flow adjusting screw rod can be rotated to adjust the output of, pulsation of the plunger pump can be effectively reduced by the valve type port plate mechanism.

Description

Low-pulsation axial plunger pump with flow adjustable from zero

Technical Field

The utility model relates to a plunger pump, concretely relates to flow is from zero adjustable low pulsation axial plunger pump.

Background

The plunger pump is a typical positive displacement hydraulic machine, is driven by a prime mover, converts input mechanical energy into pressure energy of liquid, and then inputs the pressure energy and the flow into a system, is a power source of a hydraulic system, and is widely applied to various industries in industrial production and daily life because the plunger pump can convey liquid under high pressure.

However, the flow regulation of the existing axial variable plunger pump cannot be started from zero, and the output flow has certain pulsation and is not impact-resistant, which undoubtedly makes the valves of the hydraulic system numerous and the working performance unstable.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the problem among the above-mentioned prior art, provide a flow from zero adjustable low pulsation axial plunger pump, and resistant hydraulic shock, this plunger pump's simple structure bears fluid pressure through plunger mechanism, and variable mechanism control changes the sloping cam plate inclination, the input/output of valve type valve plate control hydraulic oil.

In order to achieve the purpose, the utility model comprises a driving mechanism, a flow control mechanism, a cylinder mechanism and a valve type valve plate mechanism, wherein the driving mechanism comprises a rotary swash plate seat which is arranged in a left shell and is limited by a tapered roller bearing and a cylindrical roller bearing, a driving shaft drives the rotary swash plate seat to rotate through splines, the rotary swash plate seat drives a swash plate which is arranged on the rotary swash plate seat to rotate around the axis of a driving shaft, the swash plate drives a first swash plate adjusting rod which is arranged on the swash plate seat to rotate around the axis of the driving shaft, the first swash plate adjusting rod drives a second swash plate adjusting rod which is hinged with the first swash plate adjusting rod through a cylindrical pin and is arranged on the rotary swash plate seat to rotate around the axis of the driving shaft, the flow control mechanism comprises a flow control outer ring which is in sliding fit with the shell, a large-size deep groove ball bearing which is, the flow regulating screw rod limited by a thrust ball bearing is arranged in the shell and matched with the flow control outer ring through a thread structure, the cylinder mechanism comprises a cylinder body and a plunger arranged in a plunger hole on the cylinder body, the ball head of the plunger is hinged with a sliding shoe ball socket of the sliding shoe, a return spring outer sleeve is arranged in an outer sleeve mounting hole in the middle of the cylinder body, a return spring is arranged in an outer sleeve cavity of the return spring outer sleeve, a return spring inner sleeve compresses the return spring, a central steel ball is matched with an inner sleeve ball socket of the return spring inner sleeve and a return disc ball socket of a return disc, the return disc compresses the sliding shoe under the action of the elastic force of the return spring to enable the sliding shoe to be attached to the end surface of a swash plate, the valve type valve plate mechanism comprises a right shell and a valve type valve plate matched with the right shell, a one-way valve core is arranged in an oil inlet, the end face of the cylinder body is tightly attached to the valve type valve plate, the cylinder body and the valve type valve plate are installed on the right shell through a middle hexagon socket head cap screw, and the left shell and the right shell are installed on the shell.

Preferably, the drive shaft has a spline for engaging with the swash plate, the drive shaft has a step for limiting the bearing, and the drive shaft has a collar mounting groove for mounting a collar.

Preferably, the swash plate seat is provided with a second swash plate adjusting rod mounting groove for mounting a second swash plate adjusting rod, the swash plate seat is provided with a semicircular groove for mounting a swash plate, the swash plate seat is provided with a waist-shaped cavity, and the swash plate seat is provided with a spline hole for being matched with a spline of the driving shaft.

Preferably, the swash plate is provided with a swash plate semicircle matched with the swash plate seat, the swash plate is provided with a first swash plate adjusting rod mounting groove for mounting the first swash plate adjusting rod, and the swash plate is provided with a swash plate end face matched with the slipper.

Preferably, the first swash plate adjusting rod is provided with a first connecting lug which is matched with the second swash plate adjusting rod, and the first connecting lug is provided with a first pin hole for mounting a cylindrical pin.

Preferably, one end of the second swash plate adjusting rod is provided with a Y-shaped connector matched with the first connecting lug of the first swash plate adjusting rod, the other end of the second swash plate adjusting rod is provided with a second connecting lug matched with the flow control inner ring, the second connecting lug of the second swash plate adjusting rod is provided with a second pin hole, and the Y-shaped connector of the second swash plate adjusting rod is provided with a third pin hole.

Preferably, the flow control outer ring is provided with a limiting head for being matched with the shell, the limiting head of the flow control outer ring is provided with a driving thread through hole for being matched with the flow adjusting screw rod, the flow control outer ring is provided with an inner step for limiting the movement of the bearing, the flow control outer ring is provided with an inner thread for installing an outer ring compression nut, and the flow control outer ring is provided with an outer ring locking groove for being matched with an outer ring compression nut locking washer.

Preferably, the flow control inner ring is provided with a U-shaped connector matched with the second connecting lug of the second swash plate adjusting rod, the U-shaped connector is provided with a fourth pin hole used for mounting a cylindrical pin, the flow control inner ring is provided with an outer step used for limiting the movement of the bearing, the variable adjusting inner ring is provided with an external thread used for mounting an inner ring compression nut, and the variable adjusting inner ring is provided with an inner ring locking groove used for being matched with an inner ring compression nut locking washer.

Preferably, the cylinder body is provided with plunger holes for installing plungers, the plunger holes are uniformly distributed in the radial direction around the central axis of the cylinder body, one end of each plunger hole is provided with a diversion trench communicated with the plunger hole, the diversion trenches are uniformly distributed in the radial direction around the central axis of the cylinder body and correspond to the plunger holes one by one, the diversion trench is provided with a first limiting step for limiting the rebound stroke of the one-way valve core, the end surface of the cylinder body, on one side of the cylinder body, provided with the diversion trench is matched with one end surface of the valve-type flow distribution plate, the cylinder body is provided with a jacket installation hole for installing a return spring jacket, the cylinder body is provided with a step hole for installing an inner hexagonal socket head screw, and the step holes are uniformly distributed in the radial direction around.

Preferably, the return spring outer sleeve is provided with an outer sleeve cavity for mounting the return spring and the return spring inner sleeve.

Preferably, the inner sleeve of the return spring is provided with an inner sleeve ball socket for being matched with the central steel ball, and the inner sleeve of the return spring is provided with a protruding head for being matched with the return spring.

Preferably, the return plate is provided with a return plate ball socket used for being matched with the central steel ball, the return plate is provided with a sliding shoe limiting hole used for limiting the sliding shoe, and the sliding shoe limiting holes correspond to the plunger holes of the cylinder body one by one.

Preferably, the plunger has a ball head for engaging with the slipper.

More preferably, the shoe has a shoe ball socket for engaging with a ball of the plunger, the shoe has a bottom surface for engaging with an end surface of the swash plate, and the shoe has a step surface for engaging with the return plate.

Preferably, the valve type port plate is provided with an oil inlet hole and an oil outlet hole for installing a one-way valve core, the oil inlet hole and the oil outlet hole are formed by two cylindrical sections with different diameters and an inner conical surface connecting the two cylindrical sections, the oil inlet hole is positioned in one-to-one correspondence with the diversion grooves on the end surface of the cylinder body and uniformly distributed around the central axis of the valve type port plate with the same radius, the oil outlet hole is positioned in one-to-one correspondence with the diversion grooves on the end surface of the cylinder body and uniformly distributed around the central axis of the valve type port plate with the same radius, each diversion groove on the cylinder body corresponds to one oil inlet hole and one oil outlet hole, the uniform distribution radius of the oil inlet hole around the central axis of the valve type port plate is larger than that of the oil outlet hole around the central axis of the valve type port plate, the cylindrical section with the larger diameter of the oil inlet hole is positioned on the same end surface of the valve type port plate, the cylindrical section with the larger diameter of the oil outlet hole is, the positions of the circular through holes correspond to the positions of the step holes of the cylinder body one by one.

Preferably, the check valve core is provided with an outer conical surface used for being matched with inner conical surfaces of an oil inlet and an oil outlet on the valve type valve plate, a small end surface on one conical side of the check valve core corresponds to a cylindrical section with a smaller diameter of the oil inlet and the oil outlet, the outer diameter of the check valve core corresponds to a cylindrical section with a larger diameter of the oil inlet and the oil outlet, the outer wall of the check valve core is provided with a notch used for allowing fluid to pass through, and the check valve core is provided with a flow guide hole used for being communicated with the notch.

Preferably, one end of the flow adjusting screw is provided with a driving thread matched with the driving thread through hole of the flow control outer ring limiting head, the other end of the flow adjusting screw is provided with a fifth pin hole connected with the handle, and the middle part of the flow adjusting screw is provided with a shaft shoulder matched with the thrust ball bearing.

Preferably, the right shell is provided with a first screw mounting hole for mounting a flow adjusting screw, an inner ring groove for mounting a sealing ring is arranged in the hole, an inner guide ring groove and an outer guide ring groove which are matched with the oil inlet hole and the oil outlet hole of the valve type valve plate are arranged on the end surface of a boss matched with the valve type valve plate, the inner guide ring groove is provided with a second limit step for limiting the rebound stroke of the one-way valve core, the right shell is provided with an oil outlet communicated with the inner guide ring groove, the right shell is provided with an oil inlet communicated with the outer guide ring groove, the right shell is provided with a mounting step matched with the shell, the side surface of the step is provided with an outer ring groove for mounting the sealing ring, the right shell is provided with a threaded blind hole matched with an inner hexagonal bolt used for mounting the cylinder body and the valve type valve plate, and the threaded blind hole is in one-to-one correspondence with the step hole of the cylinder body, and the right shell is provided with a screw through hole for mounting the right shell.

Preferably, the housing is provided with a bearing mounting hole for mounting the thrust ball bearing, a second screw mounting hole for mounting the flow adjusting screw is formed in the bottom of the bearing mounting hole, a U-shaped groove for fitting with a limiting head of the flow control outer ring is formed in the housing, a circular inner cavity for mounting the flow control outer ring is formed in the housing, and a hole retainer mounting groove for mounting the hole retainer is formed in the housing.

Preferably, the left casing has a stepped through hole for mounting components such as a bearing, the left casing has a left casing mounting step for fitting with the casing, a left casing seal ring mounting outer ring groove for mounting a seal ring is provided on a side wall of the stepped surface, the left casing has a left casing stepped hole for mounting a socket head cap screw, and the left casing has a threaded through hole for connection with the outside.

As a further preferred option, the gland is mounted on the left housing, the outer sleeve of the tapered roller bearing and the inner sleeve of the tapered roller bearing are respectively fitted with different portions of the inner wall of the stepped through hole of the left housing, the left housing is fitted with the housing through a left housing mounting step and fixed with an inner hexagonal cylindrical head screw, the inner ring-free cylindrical roller bearing is fitted with a portion of the inner wall of the circular cavity of the housing to limit the lateral displacement of the inner ring-free cylindrical roller bearing with the elastic retainer ring for boring and the left housing, a portion of the outer surface of the swash plate base is fitted with a roller of the inner ring-free cylindrical roller bearing to rotate, the swash plate is mounted in a semicircular groove of the swash plate base through a self swash plate semicircle, the first swash plate adjusting rod is mounted in a first swash plate adjusting rod mounting groove on the swash plate, the second swash plate adjusting rod is mounted in a second swash plate adjusting rod mounting, the outer wall of the flow control outer ring is matched with the inner wall of a partial circular cavity of the shell, a limiting head of the flow control outer ring is matched with a U-shaped groove of the shell, the deep groove ball bearing is arranged in an inner cavity of the flow control outer ring, an outer ring compression nut and an outer ring compression nut stop washer are arranged at the inner thread of the flow control outer ring, the outer ring of the deep groove ball bearing is compressed by an inner step of the flow control outer ring, an outer ring compression nut and an outer ring compression nut stop washer, a flow control inner ring is arranged at an inner ring of the deep groove ball bearing, an inner ring compression nut and an inner ring compression nut stop washer are arranged at the outer thread of the flow control inner ring, the inner ring compression nut, an inner ring compression nut stop washer and an outer step of the flow control inner ring compress the inner ring of, a second connecting lug of a second swash plate adjusting rod is connected with a U-shaped connector of a flow control inner ring through a cylindrical pin, thrust ball bearings are arranged in bearing mounting holes of a shell, a shaft shoulder of a flow adjusting screw rod is arranged between the two thrust ball bearings, a driving thread of the flow adjusting screw rod is matched with a driving thread through hole on a limiting head of a flow control outer ring, a cylinder body and a valve type valve plate are arranged on the boss end surface of a right shell through an inner hexagonal cylindrical head screw, a plunger is arranged in a plunger hole on the cylinder body, a ball head of the plunger is matched with a ball socket of a sliding shoe, the bottom surface of the sliding shoe is matched with the swash plate end surface of a swash plate, a return spring outer sleeve is arranged in a sleeve mounting hole of the cylinder body, a return spring is arranged in a sleeve cavity of the return spring outer sleeve, an inner sleeve of the return spring, the inner end of the return spring inner sleeve is matched with the return spring, one end face of the return disc is matched with a step face of the sliding shoe, a return disc ball socket of the return disc is matched with the central steel ball, the one-way valve core is arranged in an oil inlet hole and an oil outlet hole of the valve-shaped flow distribution disc, an outer conical surface of the one-way valve core is matched with an inner conical surface of the oil inlet hole and an oil outlet hole, the valve core spring is arranged in a flow guide hole of the one-way valve core, an inner flow guide ring groove and an outer flow guide ring groove for flowing hydraulic oil are formed in the end face of a boss matched with the valve-shaped flow distribution disc on the right shell, all the oil inlet holes of the valve-shaped flow distribution disc are connected with the outer flow guide ring groove, all the oil outlet holes of the valve-shaped flow distribution disc are connected with the inner flow guide ring groove, the inner flow guide ring groove of the right shell is communicated with an oil outlet of the right shell, a right shell.

Generally, through the utility model discloses above technical scheme who thinks compares with prior art, mainly possesses following beneficial effect: the utility model discloses at during operation cylinder body irrotational, by the suction, the extrusion of valve type valve plate control hydraulic oil, output hydraulic oil pulsation is very little like this, and adopts valve type valve plate to make the utility model discloses can bear certain hydraulic shock, the utility model discloses a sloping cam plate inclination can follow zero to the biggest angle continuously adjustable, so the flow of output hydraulic oil can follow zero and adjust to the maximum flow in succession.

Drawings

FIG. 1 is a schematic view of the assembly of the present invention;

FIG. 2 is a schematic view of a half-section of the present invention in a maximum output state;

FIG. 3 is a schematic view of a half-section of the present invention in a zero output state;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is a cross-sectional view of the step B-B of FIG. 3;

FIG. 6 is a schematic view of the E-direction structure of FIG. 2;

FIG. 7 is a schematic view of the F-directed structure of FIG. 2;

fig. 8 is a schematic structural view of the driving shaft of the present invention;

fig. 9(a) and (b) are respectively schematic structural views of the swash plate base of the present invention;

FIGS. 10(a) and (b) are schematic structural views of the swash plate of the present invention, respectively;

fig. 11(a) and (b) are respectively schematic structural diagrams of a first swash plate adjusting rod and a second swash plate adjusting rod of the present invention;

fig. 12(a) and (b) are respectively schematic structural diagrams of the flow control outer ring and the flow control inner ring of the present invention;

fig. 13(a) and (b) are respectively schematic structural views of the cylinder body of the present invention;

fig. 14(a) and (b) are respectively schematic structural diagrams of the outer return spring housing and the inner return spring housing of the present invention;

fig. 15(a) and (b) are schematic structural diagrams of the return disc and the plunger of the present invention, respectively;

FIGS. 16(a) and (b) are schematic views of the structure of the slipper of the present invention;

fig. 17 is a schematic structural view of the valve type port plate of the present invention;

fig. 18 is a schematic structural view of the valve type port plate of the present invention;

fig. 19(a) and (b) are respectively schematic structural views of the check valve cartridge of the present invention;

FIG. 20 is a schematic view of the flow adjusting screw of the present invention;

FIG. 21 is a schematic structural view of the right housing of the present invention;

FIG. 22 is a schematic structural view of the right housing of the present invention;

fig. 23 is a schematic structural view of the housing of the present invention;

fig. 24 is a schematic structural view of the housing of the present invention;

FIG. 25 is a schematic view of the left housing of the present invention;

fig. 26 is a schematic structural view of the left housing of the present invention;

in the drawings: 1. a driving shaft, 2, a gland, 3, a J-shaped boneless rubber oil seal, 4, a medium-sized O-shaped seal ring, 5, a small-sized inner hexagonal socket head cap screw, 6, a deep groove ball bearing, 7, an elastic retainer ring for a shaft, 8, a tapered roller bearing, 9, a rotating swash plate seat, 10, a left shell, 11, a cylindrical pin, 12, a first swash plate adjusting rod, 13, a large-sized O-shaped seal ring, 14, a cylindrical roller bearing, 15, a second swash plate adjusting rod, 16, an elastic retainer ring for a hole, 17, a shell, 18, a flow control outer ring, 19, an outer ring gland nut, 20, an outer ring gland nut stop washer, 21, a large-sized deep groove ball bearing, 22, an inner ring gland nut stop washer, 23, a thrust ball bearing, 24, a small-sized O-shaped seal ring, 25, a flow control screw, 26, a medium-sized inner hexagonal handle, 27, a medium-sized inner hexagonal, 29. 30, a valve type valve plate, 31, a cylinder body, 32, a one-way valve core, 33, a valve core spring, 34, a right shell, 35, a large-size inner hexagon socket head cap screw, 36, a plunger, 37, a return spring outer sleeve, 38, a return spring, 39, a return spring inner sleeve, 40, a sliding shoe, 41, a return plate, 42, a center steel ball, 43, a swash plate, 44, a spline, 45, a step, 46, a shaft retainer ring mounting groove, 47, a second swash plate adjusting rod mounting groove, 48, a semicircular groove, 49, a kidney-shaped cavity, 50, a spline hole, 51, a swash plate semicircle, 52, a first swash plate adjusting rod mounting groove, 53, a swash plate end face, 54, a first connecting lug, 55, a first pin hole, 56. Y-shaped connector, 57, a second connecting lug, 58, a second pin hole, 59, a third pin hole, 60, a limiting head, 61, a driving threaded through hole, 62, an inner step, 63. 64 internal threads, 64 outer ring stopping grooves, 65. U-shaped connectors, 66 fourth pin holes, 67 external steps, 68 external threads, 69 inner ring stopping grooves, 70 plunger holes, 71 flow guide grooves, 72 first limiting steps, 73 cylinder body end faces, 74 outer sleeve mounting holes, 75 step holes, 76 outer sleeve cavities, 77 inner sleeve ball sockets, 78 protruding heads, 79 return disc ball sockets, 80 sliding shoe limiting holes, 81 ball heads, 82 sliding shoe ball sockets, 83 bottom faces, 84 step faces, 85 oil inlet holes, 86 oil outlet holes, 87 internal conical faces, 88 circular through holes, 89 external conical faces, 90 small end faces, 91 open grooves, 92 flow guide holes, 93 driving threads, 94 fifth pin holes, 95 shaft shoulders, 96 first screw mounting holes, 97 sealing ring mounting internal ring grooves, 98 protruding table end faces, 99 internal flow guide ring grooves, 100 external flow guide ring grooves, 101. the oil pump comprises a first limiting step, a second limiting step, an oil outlet, an oil inlet, a mounting step, a sealing ring mounting outer ring groove, a threaded blind hole, a threaded through hole, a bearing mounting hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1-26, the present invention includes a drive mechanism, a flow control mechanism, a cylinder mechanism and a valve style port plate mechanism.

The driving mechanism comprises a driving shaft 1, a gland 2, a left shell 10, a rotary swash plate seat 9, a swash plate 43, a first swash plate adjusting rod 12, a second swash plate adjusting rod 15, a cylindrical pin 11, a J-shaped boneless rubber oil seal 3, a middle O-shaped sealing ring 4, a small inner hexagonal socket head cap screw 5, a small deep groove ball bearing 6, a shaft elastic retainer ring 7, a tapered roller bearing 8, a non-inner cylindrical roller bearing 14, an elastic retainer ring 16 for holes, a large O-shaped sealing ring 13 and a large inner hexagonal socket head cap screw 35, wherein the deep groove ball bearing 6 and the tapered roller bearing 8 are arranged in a stepped through hole 113 of the left shell 10, the left shell 10 is provided with a left shell mounting step 114 for connecting with the shell 17, the outer wall of the left shell mounting step 114 is provided with a left shell sealing ring mounting groove 115 for mounting the large O-shaped sealing ring 13, the left shell 10 is provided with a left shell hole 116 for mounting the large inner hexagonal socket head cap screw 35, the left shell 10 is provided with a threaded through hole 117 for external connection, the driving shaft 1 is arranged at the inner ring of the deep groove ball bearing 6 and is limited by the step 45 on the driving shaft and the elastic retainer ring 7 for shaft arranged on the retainer ring mounting groove 46 for shaft, the rotary swash plate seat 9 is arranged at the inner ring of the tapered roller bearing 8, the rotary swash plate seat 9 is provided with a kidney-shaped cavity 49, the driving shaft 1 is connected with the spline hole 50 of the rotary swash plate seat 9 through the spline 44 of the driving shaft and drives the rotary swash plate seat 9 to rotate, part of the outer circumferential surface of the rotary swash plate seat 9 is matched with the tapered roller bearing 8 and the non-inner cylindrical roller bearing 14, the semicircular groove 48 of the rotary swash plate seat 9 is matched with the swash plate 43 through the swash plate semicircle 51 and drives the swash plate 43 to rotate, the first swash plate adjusting rod 12 is arranged in the first swash plate adjusting rod mounting groove 52 on the swash plate 43, the first swash plate, the second swash plate adjusting rod 15 is arranged in a second swash plate adjusting rod mounting groove 47 on the swash plate base 9, the second swash plate adjusting rod 15 can slide in the second swash plate adjusting rod mounting groove 47 on the swash plate base 9, the first swash plate adjusting rod 12 is provided with a first connecting lug 54 matched with the second swash plate adjusting rod 15, the first connecting lug 54 is provided with a first pin hole 55 used for mounting the cylindrical pin 11, one end of the second swash plate adjusting rod 15 is provided with a Y-shaped connector 56 matched with the first connecting lug 54 of the first swash plate adjusting rod 12, the other end of the second swash plate adjusting rod 15 is provided with a second connecting lug 57 matched with the flow control inner ring 29, the second connecting lug 57 of the second swash plate adjusting rod 15 is provided with a second pin hole 58, the Y-shaped connector 56 of the second swash plate adjusting rod 15 is provided with a third pin hole 59, the first swash plate adjusting rod 12 and the second swash plate adjusting rod 15 are hinged through the cylindrical pin 11, when second sloping cam plate is adjusted pole 15 and is adjusted pole mounting groove 47 and move for the second sloping cam plate, cylindric lock 11 retrains first sloping cam plate and adjusts pole 12 and do corresponding removal for first sloping cam plate and adjust pole mounting groove 52, the relative contained angle of first sloping cam plate is adjusted pole 12 and second sloping cam plate and is adjusted pole 15 and produce the change, first sloping cam plate is adjusted pole 12 and is driven sloping cam plate 43 inclination and change, when second sloping cam plate is adjusted pole 15 and is reached when the outside distance that moves for its mounting groove, the contained angle of first sloping cam plate is adjusted pole 12 and second sloping cam plate and is adjusted pole 15, the inclination of sloping cam plate 43 is 0 this moment, when drive shaft 1 drive swash plate seat 9 drives sloping cam plate 43 and rotates, first sloping cam plate is adjusted pole 12 and second sloping cam plate is adjusted pole 15 and.

The flow control mechanism comprises a shell 17, a flow control screw rod 25, a flow control outer ring 18, a flow control inner ring 29, an outer ring compression nut 19, an inner ring compression nut 28, an outer ring compression nut stop washer 20, an inner ring compression nut stop washer 22, a large-size deep groove ball bearing 21, a thrust ball bearing 23 and an embossing handle 26, wherein part of the outer wall of the flow control outer ring 18 is matched with a part of a circular cavity 111 of the shell 17, a limiting head 60 of the flow control outer ring 18 is matched with a U-shaped groove 110 of the shell 17, the flow control outer ring 18 can slide in the circular cavity 111 of the shell 17 along the axial direction under the common constraint of the circular cavity 111 and the U-shaped groove 110 of the shell 17, the flow control screw rod 25 is arranged in a second screw rod mounting hole 109 of the shell 17, a driving thread 93 of the flow control screw rod 25, the shaft shoulder 95 of the flow adjusting screw 25 is matched with the thrust ball bearing 23 arranged in the bearing mounting hole 108 of the shell 17, the flow adjusting screw 25 can rotate under the restraint of the thrust ball bearing 23, the flow adjusting screw 25 is provided with a fifth pin hole 94 matched with the embossing handle 26, the large-size deep groove ball bearing 21 is arranged in the flow control outer ring 18, the outer ring compression nut 19 is matched with the internal thread 63 of the flow control outer ring 18, the flow control outer ring 18 is provided with an outer ring stopping groove 64 matched with the outer ring compression nut stopping gasket 20, the outer ring compression nut 19 compresses the outer ring compression nut stopping gasket 20 and the outer ring of the large-size deep groove ball bearing 21 together with the inner step 62 of the flow control outer ring 18 after being screwed, the displacement of the outer ring of the large-size deep groove ball bearing 21 relative to the flow control outer ring 18 is limited, and the flow control inner ring, the inner ring compression nut 28 is matched with an external thread 68 of the flow control inner ring 29, an inner ring stop groove 69 used for being matched with the inner ring compression nut stop washer 22 is arranged on the flow control inner ring 29, the inner ring compression nut 28 and an outer step 67 of the flow control inner ring 29 jointly compress the inner ring compression nut stop washer 22 and an inner ring of the large-size deep groove ball bearing 21 after being screwed, relative displacement of the flow control inner ring 29 relative to the inner ring of the large-size deep groove ball bearing 21 is limited, the flow control inner ring 29 can rotate relative to the flow control outer ring 18 under the constraint of the large-size deep groove ball bearing 21, a fourth pin hole used for installing the cylindrical pin 11 is arranged on a U-shaped connecting head 65 of the flow control inner ring 29, the second swash plate adjusting rod 15 is hinged with the U-shaped connecting head 65 of the flow control inner ring 29 through the cylindrical pin 11.

The cylinder mechanism comprises a cylinder body 31, a plunger 36, a sliding shoe 40, a return spring outer sleeve 37, a return spring inner sleeve 39, a return spring 38, a central steel ball 42, a return disc 41 and a medium-sized inner hexagonal head screw 27, wherein the plunger 36 is arranged in a plunger hole 70 on the cylinder body 31, the plunger hole 70 is uniformly distributed on the cylinder body 31 around the central shaft of the cylinder body 31, one end of the plunger hole 70 is provided with a flow guide groove 71, a first limit step 72 for limiting the moving stroke of the one-way valve core 32 is arranged on the flow guide groove 71, the cylinder body 31 is provided with a step hole 75 for mounting the medium-sized inner hexagonal head screw 27, the cylinder body end surface 73 on one side of the flow guide groove 71 of the cylinder body 31 is matched with one end surface of the valve type flow distribution disc 30, a sliding shoe ball socket 82 of the sliding shoe 40 is hinged with a ball head 81 of the plunger 36, the return spring outer sleeve 37 is arranged in an outer sleeve mounting hole 74, the return spring inner sleeve 39 is installed in an outer sleeve cavity 76 of the return spring outer sleeve 37, one end of the return spring 38 is in contact with the bottom surface of the inner cavity of the return spring outer sleeve 37, a protruding head 78 of the return spring inner sleeve 39 is in contact with the other end of the return spring 38, the return spring 38 is in a compressed state after installation is completed, an inner sleeve ball socket 77 of the return spring inner sleeve 39 is matched with the central steel ball 42, a return plate ball socket 79 of the return plate 41 is matched with the central steel ball 42, the sliding shoe 40 is installed in a sliding shoe limiting hole 80 of the return plate 41, one end surface of the return plate 41 is matched with a step surface 84 of the sliding shoe 40, and a bottom surface 83 of the sliding shoe 40 is matched with.

The valve type valve plate mechanism comprises a valve type valve plate 30, a one-way valve core 32, a right shell 34, a valve core spring 33, a small-size O-shaped sealing ring 24, a large-size inner hexagonal cylindrical head screw 35 and a large-size O-shaped sealing ring 13, wherein the valve type valve plate 30 is provided with an oil inlet hole 85 and an oil outlet hole 86 for mounting the one-way valve core 32, the oil inlet hole 85 and the oil outlet hole 86 are formed by two cylindrical sections with different diameters and an inner conical surface 87 connecting two cylindrical surfaces, the position of the oil inlet hole 85 corresponds to the diversion grooves 71 on the cylinder body end surface 73 one by one and is uniformly distributed around the central axis of the valve type valve plate 30 with the same radius, the position of the oil outlet hole 86 corresponds to the diversion grooves 71 on the cylinder body end surface 73 one by one and is uniformly distributed around the central axis of the valve type valve plate 30 with the same radius, each diversion groove 71 on the cylinder body 31 corresponds to one oil inlet hole 85 and one oil outlet hole 86, the uniform distribution radius of the oil inlet hole 85, the cylinder section with the larger diameter of the oil inlet 85 is positioned on the same end face of the valve type port plate 30, the cylinder section with the larger diameter of the oil outlet 86 is positioned on the other end face of the valve type port plate 30, the one-way valve core 32 is arranged in the oil inlet 85 and the oil outlet 86 of the valve type port plate 30, the outer conical surface 89 of the one-way valve core 32 is matched with the inner conical surface 87 of the oil inlet 85 and the oil outlet 86, the small end surface 90 on the conical side of the one-way valve core 32 is corresponding to the cylinder sections with the smaller diameters of the oil inlet 85 and the oil outlet 86, the outer diameter of the one-way valve core 32 is corresponding to the cylinder sections with the larger diameters of the oil inlet 85 and the oil outlet 86, the outer wall of the one-way valve core 32 is provided with a notch 91 for allowing fluid to pass through, the right shell 34 is provided with a first screw mounting hole 96 for mounting the flow adjusting screw 25, a sealing ring is arranged in the hole for mounting an inner ring groove 97, and a boss end face 98, which the right shell 34 is matched with the valve type port plate 30 is A flow ring groove 100, wherein the inner diversion ring groove 99 is provided with a second limit step 101 for limiting the rebound stroke of the one-way valve core 32, the right shell 34 is provided with an oil discharge port 102 communicated with the inner diversion ring groove 99, the right shell 34 is provided with an oil inlet 103 communicated with the outer diversion ring groove 100, the right shell 34 is provided with an installation step 104 for being matched with the shell 17, the side surface of the step is provided with a sealing ring mounting outer ring groove 105 for mounting a large-size O-shaped sealing ring 13, the right shell 34 is provided with a threaded blind hole 106 for mounting the cylinder body 31 and the valve-type port plate 30, the right shell 34 is provided with a screw through hole 107 for connecting with the shell 17, the valve core spring 33 is mounted in the flow guide hole 92 of the one-way valve core 32, the valve core spring 33 is in a compressed state after being mounted, at the moment, the valve core spring 33 can be continuously compressed, and the valve-type port plate 30 is provided with a circular through hole 88 for penetrating through the medium-size inner hexagonal socket head screw 27.

The working principle of the utility model is that the driving shaft 1 is driven by external force to rotate, the driving shaft 1 drives the rotating swash plate seat 9 to rotate through the spline 44, the rotating swash plate seat 9 drives the swash plate 43 and the first swash plate adjusting rod 12 and the second swash plate adjusting rod 15 to rotate, the second swash plate adjusting rod 15 drives the flow control inner ring 29 to rotate, the cylinder body 31 is fixed on the right shell 34 through the middle hexagon socket head cap screw 27, the plunger 36 is installed in the plunger hole 70 of the cylinder body 31, so the plunger 36 can not rotate along with the rotation of the swash plate 43, only can do reciprocating motion relative to the cylinder body 31 under the driving of the slipper shoe 40 hinged with the plunger 36, when the external force drives the embossing handle 26 to rotate, the embossing handle 26 drives the flow control screw 25 to rotate, the driving thread 93 of the flow control screw 25 drives the flow control outer ring 18 to move, when the flow control screw 25 drives the flow control outer ring 18 to move, the large-size deep groove ball bearing 21 which is arranged in the flow control outer ring 18 and is driven by the flow control outer ring 18 to move from the side far away from the driving shaft 1 to the side close to the driving shaft 1, the large-size deep groove ball bearing 21 drives the flow control inner ring 29 to move from the side far away from the driving shaft 1 to the side close to the driving shaft 1, the second swash plate adjusting rod 15 drives the first swash plate adjusting rod 12 to swing, the first swash plate adjusting rod 12 drives the swash plate 43 to swing, when the flow control outer ring 18 starts to move from the position farthest away from the driving shaft 1 to the position close to the driving shaft 1, the included angle between the second swash plate adjusting rod 15 and the first swash plate adjusting rod 12 is gradually reduced from 90 degrees, the inclined angle of the swash plate 43 is also gradually increased from 0 degree, when the flow control outer ring 18 moves to the position closest to the driving shaft 1, the included angle between the second swash plate adjusting rod 15 and the, the inclination angle of the swash plate 43 reaches the maximum, the return spring outer sleeve 37 supports the return spring 38, the return spring 38 supports the return spring inner sleeve 39, the return spring 38 is in a compressed state when the installation is finished, the elastic force of the return spring 38 acts on the return spring inner sleeve 39, the return spring inner sleeve 39 transmits the acting force to the central steel ball 42, the central steel ball 42 transmits the acting force to the return disc 41, the return disc 41 transmits the acting force to the sliding shoe 40, so that the sliding shoe 40 is pressed on the swash plate 43, the check valve core 32 is installed in the oil inlet hole 85 and the oil outlet hole 86 of the valve type port plate 30, the valve core spring 33 is installed in the flow guide hole 92 of the check valve core 32, the valve core spring 33 is in a compressed state after the installation is finished, at the moment, the valve core spring 33 can be compressed continuously, the elastic force of the valve core spring 33 acts on the check valve core 32, so that the, therefore, the sealing requirement is achieved, when pressure larger than the elastic force of the valve core spring 33 acts on the small end surface 90 of the one-way valve core 32, the one-way valve core 32 moves towards one side of the valve core spring 33, the outer conical surface 89 of the one-way valve core 32 is separated from the inner conical surface 87 of the oil feeding hole (85) and the oil discharging hole (86) on the valve type port plate 30, two sides of the one-way valve core 32 are communicated, after the pressure disappears, the valve core spring 33 pushes the one-way valve core 32 to reset, the outer conical surface 89 of the one-way valve core 32 contacts the inner conical surface 87 of the oil feeding hole (85) and the oil discharging hole (86) on the valve type port plate 30, two sides of the one-way valve core 32 are separated, the swash plate 43, the plurality of sliding shoes 40, the plurality of plungers 36, the cylinder body 31, the valve type port plate 30 and the plurality of one-way valve cores 32 form a plurality of closed cavities, the closed cavities are separated by the valve type, the volume of the closed cavity is increased to generate negative pressure, so that the check valve core 32 arranged in the oil inlet hole 85 of the valve type port plate 30 is opened, hydraulic oil enters the outer guide ring groove 100 through the oil inlet 103 on the right shell 34 and is sucked into the closed cavity, when the plunger 36 moves in the plunger hole 70 on the cylinder 31, the cavity volume is reduced to generate positive pressure, so that the check valve core 32 arranged in the oil discharge hole 86 of the valve type port plate 30 is opened, the hydraulic oil is pressed out of the closed cavity and flows into the inner guide ring groove 99 on the right shell 34 and is discharged through the oil discharge port 102, the bottom surface 83 of all the sliding shoes 40 is tightly attached to the swash plate end surface 53 of the swash plate 43 under the action of the return plate 41, when the inclination angle of the swash plate 43 is not zero degree, all the plungers 36 do reciprocating motion relative to the cylinder 31 along with the continuous rotation of the swash plate 43, and the oil suction action is completed when the plungers 36 gradually move from a place farthest from the drive shaft 1 to a place closest to the, and then gradually move from the place closest to the driving shaft 1 to the place farthest from the driving shaft 1, the action of pressing oil by the plunger pump is completed, all the plungers 36 make respective reciprocating motion along with the swash plate 43 when rotating, so that the plunger pump can continuously and repeatedly suck oil and press oil, and the plunger pump can continuously suck oil and press oil, thereby continuously working.

When the inclination angle of the swash plate 43 is 0 °, the swash plate end surface 53 of the swash plate 43 is parallel to the cylinder end surface 73, the distance between any point on the swash plate end surface 53 and the cylinder end surface 73 is equal, the surface formed by the swash plate end surface 53 of the swash plate 43 when the swash plate 43 rotates is a plane, the slipper 40 is tightly attached to the swash plate end surface 53 of the swash plate 43, so that the plunger 36 hinged to the slipper 40 does not displace relative to the cylinder 31 when the swash plate 43 rotates, the plunger pump is in a zero output state at this time, when the inclination angle of the swash plate 43 is not 0 °, the end surface of the swash plate 43 is not parallel to the cylinder end surface 73, the distance between any point on the swash plate end surface 53 and the cylinder end surface 73 changes with the inclination angle of the swash plate 43, the slipper 40 is tightly attached to the swash plate end surface 53 of the swash plate 43, so that the slipper 40 and the plunger 36 hinged to the slipper 40 reciprocate relative to the cylinder, the plunger 36 will generate corresponding displacement relative to the cylinder 31, when the swash plate 43 rotates to make the displacement generated by the plunger 36 move from the side close to the cylinder 31 to the side far from the cylinder 31, at this time, the plunger moves out of the cylinder 31 by a corresponding distance, the cavity formed by the swash plate 43, the slipper 40, the plunger 36, the cylinder 31, the valve type port plate 30 and the one-way valve core 32 is enlarged, thereby generating negative pressure, and the one-way valve core 32 installed in the oil inlet hole 85 of the valve type port plate 30 correspondingly is opened, so that the hydraulic oil enters the outer guide ring groove 100 through the oil inlet 103 on the right shell 34 and is sucked into the closed cavity, when the swash plate 43 rotates to make the displacement generated by the plunger 36 move from the side far from the cylinder 31 to the side close to the cylinder 31, at this time, the plunger 36 moves into a corresponding distance from the cylinder 31, and the swash plate 43, the slipper 40, the plunger 36, the cylinder 31, the valve type port, The cavity formed by the one-way valve cores 32 is reduced to generate positive pressure, so that the corresponding one-way valve core 32 arranged in the oil discharge hole 86 of the valve type port plate 30 is opened, hydraulic oil is pressed out of the closed cavity and then flows into the inner guide ring groove 99 on the right shell 34 to be discharged through the oil discharge port 102, and mechanical energy is converted into hydraulic energy, because the swash plate 43, the plurality of piston shoes 40, the plurality of plungers 36, the cylinder body 31, the valve type port plate 30 and the plurality of closed cavities formed by the one-way valve cores 32 are not communicated with each other, the cavities are not interfered with each other, and the cavities complete respective oil suction or oil discharge actions along with the movement condition of the respective piston shoes 40 when the piston pump works, so that the piston pump works continuously, when the inclination angle of the swash plate 43 is gradually increased from 0 degree, the distance between any point on the end surface 53 of the cylinder body end surface 73 is changed along with the change of the inclination angle of the swash, so that the difference in distance between the position where the shoes 40 are farthest from the cylinder end surfaces 73 and the position where the shoes are closest when the swash plate 43 rotates increases as the inclination angle increases, the stroke of the shoes 40 moving the plungers 36 increases, therefore, the difference between the maximum volume and the minimum volume of the closed cavity formed by the swash plate 43, the piston shoe 40, the plunger 36, the cylinder 31, the valve type port plate 30 and the check valve core 32 increases with the stroke of the plunger 36, so that the output flow of the plunger pump increases with the increase of the inclination angle of the swash plate 43, and conversely, the output flow of the plunger pump decreases with the decrease of the inclination angle of the swash plate 43, and because the inclination angle of the swash plate 43 can be continuously adjusted from 0 degree to the maximum angle and from the maximum angle to 0 degree, the flow rate of the plunger pump is comprehensively adjustable from zero output to maximum flow output and from maximum flow output to zero output.

When the output end of the plunger pump encounters hydraulic impact and the pressure of the output end is greater than or equal to the output pressure of the plunger pump, the one-way valve element 32 in the oil discharge hole 86 is reset under the pushing of the valve element spring 33, and the plunger pump is prevented from being damaged due to the impact of the hydraulic impact on the internal structure of the plunger pump.

Claims

1. The utility model provides a flow is from zero adjustable low pulsation axial plunger pump which characterized in that: comprises a driving mechanism, a flow control mechanism, a cylinder mechanism and a valve type valve plate mechanism, wherein the driving mechanism comprises a rotary swash plate seat (9) which is arranged in a left shell (10) and is limited by a tapered roller bearing (8) and a cylindrical roller bearing (14), a driving shaft (1) drives the rotary swash plate seat (9) to rotate through an upper spline (44) of the driving shaft, the rotary swash plate seat (9) drives a swash plate (43) arranged on the rotary swash plate seat to rotate around the axis of the driving shaft (1), the swash plate (43) drives a first swash plate adjusting rod (12) arranged on the swash plate seat to rotate around the axis of the driving shaft (1), the first swash plate adjusting rod (12) drives a second swash plate adjusting rod (15) which is hinged with the cylindrical pin (11) and arranged on the rotary swash plate seat (9) to rotate around the axis of the driving shaft (1), the flow control mechanism comprises a flow control outer ring (18), a large deep groove ball bearing (21) which is arranged in a flow control outer ring (18) and limited by an outer ring gland nut (19) and a flow control inner ring (29) which is arranged on the large deep groove ball bearing (21) and limited by an inner ring gland nut (28), a flow adjusting screw rod (25) which is arranged in a shell (17) and limited by a thrust ball bearing (23) is matched with the flow control outer ring (18) through a thread structure, a cylinder mechanism comprises a cylinder body (31) and a plunger (36) which is arranged in a plunger hole (70) on the cylinder body (31), a ball head (81) of the plunger (36) is hinged with a sliding shoe ball socket (82) of a sliding shoe (40), a return spring outer sleeve (37) is arranged in an outer sleeve mounting hole (74) in the middle of the cylinder body (31), a return spring (38) is arranged in an outer sleeve cavity (76) of the return spring outer sleeve (37), and a return spring inner sleeve (39, the central steel ball (42) is matched with an inner sleeve ball socket (77) of a return spring inner sleeve (39) and a return disc ball socket (79) of a return disc (41), the return disc (41) presses a sliding shoe (40) under the action of the elastic force of a return spring (38) to enable the sliding shoe to be attached to the end face (53) of a swash plate (43), a valve type valve plate mechanism comprises a right shell (34) and a valve type valve plate (30) matched with the right shell, a one-way valve core (32) is arranged in an oil inlet hole (85) and an oil outlet hole (86) of the valve type valve plate (30), each flow guide groove (71) on the cylinder body (31) corresponds to one oil inlet hole (85) and one oil discharge hole (86), the end surface (73) of the cylinder body is tightly attached to the valve type port plate (30), the cylinder body (31) and the valve type port plate (30) are installed on the right shell (34) through a middle hexagon socket head cap screw (27), and the left shell (10) and the right shell (34) are installed on the shell (17).

2. The low pulsation axial plunger pump with flow adjustable from zero according to claim 1, characterized in that: a second swash plate adjusting rod mounting groove (47) used for mounting a second swash plate adjusting rod (15) is formed in the rotary swash plate seat (9), a semicircular groove (48) used for mounting a swash plate (43) is formed in the rotary swash plate seat (9), a waist-shaped cavity (49) is formed in the rotary swash plate seat (9), and a spline hole (50) matched with a spline (44) of a driving shaft (1) is formed in the rotary swash plate seat (9).

3. The low pulsation axial plunger pump with flow adjustable from zero according to claim 1, characterized in that: the swash plate (43) is provided with a swash plate semicircle (51) matched with the rotary swash plate seat (9), the swash plate (43) is provided with a first swash plate adjusting rod mounting groove (52) used for mounting a first swash plate adjusting rod (12), and the swash plate (43) is provided with a swash plate end face (53) matched with the slipper (40).

4. The low pulsation axial plunger pump with flow adjustable from zero according to claim 1, characterized in that: the flow control outer ring (18) is provided with a limiting head (60) matched with the shell (17), a driving thread through hole (61) matched with the flow adjusting screw rod (25) is formed in the limiting head (60) of the flow control outer ring (18), an inner step (62) used for limiting the movement of a bearing is arranged on the flow control outer ring (18), an inner thread (63) used for installing an outer ring compression nut is arranged on the flow control outer ring (18), and an outer ring locking groove (64) matched with an outer ring compression nut locking washer (20) is formed in the flow control outer ring (18).

5. The low pulsation axial plunger pump with flow adjustable from zero according to claim 1, characterized in that: plunger holes (70) used for installing plungers (36) are formed in the cylinder body (31), the plunger holes (70) are uniformly distributed in the radial direction around the central shaft of the cylinder body (31), a guide groove (71) communicated with one end of each plunger hole (70) is formed in one end of each plunger hole (70), the guide grooves (71) are uniformly distributed in the radial direction around the central shaft of the cylinder body (31) and correspond to the plunger holes (70) one by one, a first limiting step (72) used for limiting the rebound stroke of a one-way valve core (32) is formed in each guide groove (71), the cylinder body end face (73) on one side, provided with the guide groove (71), of the cylinder body (31) is matched with one end face of the valve type flow distribution plate (30), an outer sleeve installation hole (74) used for installing a return spring outer sleeve (37) is formed in the cylinder body (31), stepped holes (75) used for installing inner hexagonal cylindrical head screws are formed in the cylinder body (31), and the stepped holes (75) are uniformly distributed in the radial.

6. The low pulsation axial plunger pump with flow adjustable from zero according to claim 1, characterized in that: the valve type valve plate (30) is provided with an oil inlet hole (85) and an oil outlet hole (86) for installing a one-way valve core (32), the oil inlet hole (85) and the oil outlet hole (86) are formed by two cylindrical sections with different diameters and an inner conical surface (87) connecting the two cylindrical sections, the position of the oil inlet hole (85) corresponds to the diversion trenches (71) on the cylinder body end surface (73) one by one and is uniformly distributed around the central axis of the valve type valve plate (30) with the same radius, the position of the oil outlet hole (86) corresponds to the diversion trenches (71) on the cylinder body end surface (73) one by one and is uniformly distributed around the central axis of the valve type valve plate (30) with the same radius, each diversion trench (71) on the cylinder body (31) corresponds to one oil inlet hole (85) and one oil outlet hole (86), the uniform distribution radius of the oil inlet hole (85) around the central axis of the valve type valve plate (30) is larger than the uniform distribution radius of the oil outlet hole (86, the cylinder section with the larger diameter of the oil inlet hole (85) is positioned on the same end face of the valve type valve plate (30), the cylinder section with the larger diameter of the oil discharge hole (86) is positioned on the other end face of the valve type valve plate (30), the valve type valve plate (30) is provided with a circular through hole (88) used for penetrating through an inner hexagonal cylinder head screw, and the position of the circular through hole (88) corresponds to the position of a step hole (75) on the cylinder body (31) one by one.

7. The low pulsation axial plunger pump with flow adjustable from zero according to claim 1, characterized in that: the check valve core (32) is provided with an outer conical surface (89) which is used for being matched with an oil inlet hole (85) on the valve type valve plate (30) and an inner conical surface (87) of an oil discharge hole (86), a small end surface (90) on one conical side of the check valve core (32) corresponds to a cylindrical section with smaller diameter of the oil inlet hole (85) and the oil discharge hole (86), the outer diameter of the check valve core (32) corresponds to a cylindrical section with larger diameter of the oil inlet hole (85) and the oil discharge hole (86), the outer wall of the check valve core (32) is provided with a notch (91) for allowing fluid to pass through, and the check valve core (32) is provided with a flow guide hole (92) communicated with the notch.

8. The low pulsation axial plunger pump with flow adjustable from zero according to claim 1, characterized in that: the right shell (34) is provided with a first screw mounting hole (96) for mounting a flow adjusting screw (25), an inner ring groove (97) for mounting a sealing ring is arranged in the hole, an inner flow guide ring groove (99) and an outer flow guide ring groove (100) which are matched with an oil inlet hole (85) and an oil outlet hole (86) of the valve type flow distribution disc (30) are arranged on a boss end surface (98) of the right shell (34) matched with the valve type flow distribution disc (30), the inner flow guide ring groove (99) is provided with a second limiting step (101) for limiting the rebound stroke of the one-way valve core (32), the right shell (34) is provided with an oil outlet (102) communicated with the inner flow guide ring groove (99), the right shell (34) is provided with an oil inlet (103) communicated with the outer flow guide ring groove (100), the right shell (34) is provided with a mounting step (104) matched with the shell (17), and the side surface of the step is provided with an outer ring groove (105) for mounting the, the right shell (34) is provided with a threaded blind hole (106) matched with an inner hexagon bolt used for mounting the cylinder body (31) and the valve type valve plate (30), the threaded blind hole (106) is in one-to-one correspondence with the step hole (75) of the cylinder body (31), and the right shell (34) is provided with a screw through hole (107) used for mounting the right shell (34).

9. The low pulsation axial plunger pump with flow adjustable from zero according to claim 1, characterized in that: the bearing mounting hole (108) used for mounting the thrust ball bearing (23) is formed in the shell (17), the second screw mounting hole (109) used for mounting the flow adjusting screw (25) is formed in the hole bottom of the bearing mounting hole (108), a U-shaped groove (110) matched with the limiting head (60) of the flow control outer ring (18) is formed in the shell (17), a circular inner cavity (111) used for mounting the flow control outer ring (18) is formed in the shell (17), and a hole retainer ring mounting groove (112) used for mounting the elastic retainer ring (16) for the hole is formed in the shell (17).

10. The low pulsation axial plunger pump with flow adjustable from zero according to claim 1, characterized in that: the left shell (10) is provided with a stepped through hole (113) for mounting parts such as a bearing and the like, the left shell (10) is provided with a left shell mounting step (114) matched with the shell (17), the side wall of the step surface of the left shell is provided with a left shell sealing ring mounting outer ring groove (115) for mounting a sealing ring, the left shell (10) is provided with a left shell stepped hole (116) for mounting a hexagon socket head cap screw, and the left shell (10) is provided with a threaded through hole (117) for being connected with the outside.