CN107288874B - Single-acting blade-type positive displacement pump - Google Patents

Abstract

The present invention relates to a kind of single-acting blade-type positive displacement pumps, including stator, drive shaft, blade, cutting ferrule, flow side plate and end cap, centered on stator, device has flow side plate and end cap, stator to be enclosed pump chamber with flow side plate successively respectively for its axial both sides, and blade, cutting ferrule and drive shaft are arranged in pump chamber, card cover device is in drive shaft axial direction both sides, and annular groove is formed between drive shaft external cylindrical surface, blade one end is hinged on stator inner wall, and the other end is slideably installed in annular groove.The present invention is by changing blade construction, rolling bearing being arranged in rotor surface, blade is changed into the swing that blade is cut with scissors around cylinder along the sliding of rotor slot, change sliding friction is rolling friction, since one end of blade is connected to rolling bearing outer surface by the limitation of annular groove, improve vane stress situation, avoiding traditional blades pump blade, radially abrasion caused by slot sliding is big and stuck phenomenon, improves the intensity of drive shaft, the mechanical efficiency of pump and service life.

Description

Single-acting blade-type positive displacement pump

Technical field

The present invention relates to volume pump technical field more particularly to a kind of single-acting blade-type positive displacement pumps.

Background technology

Traditional single acting vane pump is configured using rotor and the eccentric of stator by blade in rotor slot, is being turned When son rotation, so that blade is slided and is thrown away along rotor slot by centrifugal force and be pressed on stator inner wall, it is several variable close to be formed Vessel is sealed to realize imbibition and drain.Traditional blades pump configuration so that there are sliding friction, blade upper ends between blade and rotor slot Blade wear is exacerbated, vane pump service life is reduced there is also larger frictional force by centrifugation force effect with stator inner surface, And frictional force and the inclination of the resultant direction and blade groove of blade centrifugal force between Corioli inertial force suffered by the blade, blade and stator When direction is inconsistent, will generate lateral force causes blade stuck, influences the reliability and operation flexibility of pump.

Invention content

To solve the problems, such as that traditional single acting vane pump blade wear is big, easily stuck, the present invention provides a kind of single-acting Vane type volumetric pumps, and blade is changed into blade one end along the sliding of rotor slot is hinged the other end around circle hinged place pendulum with stator Dynamic, change sliding friction effectively reduces the abrasion of blade and easy stuck problem into rolling friction, and improve vane pump uses the longevity Life.

The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of single-acting blade-type positive displacement pump, including：

Stator has tubular cavity；

Drive shaft, it is rotatable to be arranged in the tubular cavity of the stator；The drive shaft includes rotor and peace Shaft on the rotor, the shaft and the tubular cavity of the stator are coaxial, the axis of the rotor with it is described fixed The axis of auxiliary cylinder shape cavity is parallel and misaligned, and distance between the two is eccentricity one, and the rotor is driven by the shaft And it rotates；

Cutting ferrule offers circular groove to be cylindric on an end face of the cutting ferrule, the axis of the circular groove with The axis of the cutting ferrule is parallel and misaligned, and distance between the two is eccentricity two, the eccentricity two and the eccentricity One is equal, and the cutting ferrule is set as two, the circular groove notches of two cutting ferrules relatively device in the rotor along axis To the both sides in direction, the bottom surface of two circular grooves is bonded with two end faces of the rotor respectively, the driving shaft rotation It drives the cutting ferrule to rotate therewith when dynamic, forms annular between the madial wall of the circular groove and the external cylindrical surface of the rotor Slot, the circular groove and the rotor coaxial；

Flow side plate is cylindric, one end face offers circular groove two, the flow side plate external cylindrical surface and institute It states and offers multiple assignment holes for running through the flow side plate both ends of the surface between the side of circular groove two, flow side plate includes Preceding flow side plate and rear flow side plate, the assignment hole of the preceding flow side plate is interior to be equipped with tapping valve, the rear flow side plate The assignment hole in be equipped with liquid sucting valve, the preceding flow side plate and/or it is described after the center of flow side plate be further opened with and institute State the matched axis hole of shaft two；Two circular grooves, the two notch phase of the preceding flow side plate and the rear flow side plate It is mounted on the both sides of the stator shaft orientation over the ground, pump chamber is enclosed with the stator；

Multiple blades, one end, and can be relatively described fixed along the inner wall that the axial direction of the stator is hinged on the stator The other end of son rotation, the blade is provided in the trunnion insertion annular groove described in cylindrical trunnion and can be with the ring The rotation of shape slot and swing；

The external cylindrical surface of the cutting ferrule and the inner wall of circular groove two are slidably matched, two adjacent blades, stator inner wall, turn External cylindrical surface, two cutting ferrules, preceding flow side plate and the rear flow side sheet room of son form the working chamber of sealing, the working chamber and institute State assignment hole connection；

End cap, fixing device in axial two outside of the pump chamber, including drive end bearing bracket and rear end cap, the drive end bearing bracket and/or It is further opened on rear end cap and the matched axis hole of the shaft three；The shaft is pierced by rear and actuating unit from the axis hole three Connect, apocenosis passage and imbibition channel is respectively set on the drive end bearing bracket and the rear end cap, and pass through the flow respectively Hole is connected to the working chamber, when the shaft drives the rotor rotation, in the external cylindrical surface of the rotor and the stator The radial distance generating period of wall sexually revises, and the rotor drives the blade to be swung around with the articulated section of stator inner wall.

Further, cylinder groove is provided on the inner wall of the stator in an axial direction, one end of the blade is provided with and circle The matched cylinder hinge of column slot, the cylinder hinge are inserted into cylinder groove, so that the blade is formed with the stator hinged.

Further, cylinder hinge is provided on the inner wall of the stator in an axial direction, one end of the blade is provided with and circle Column cuts with scissors matched cylinder groove, and the cylinder hinge is inserted into cylinder groove, so that the blade is formed with the stator hinged.

Further, axis hole is offered on the end face of at least one in two cutting ferrules, the shaft is inserted into institute It states in axis hole.

Further, coordinate or be interference fitted connection between the shaft and axis hole one using transition, or using key connection Or spline connection.

Further, the rotor exterior device has rolling bearing, the blade to be connected to the outer ring of the rolling bearing On.

Further, the imbibition channel is arranged on end cap in the rear, it includes the liquid sucting port being connected and low pressure oil Chamber, the liquid sucting port are to be opened in the through-hole of the rear end cap radially, and the low pressure oil pocket is to be opened in the rear end cap end Annular groove on face, the liquid sucting port are connected to by the low pressure oil pocket with the assignment hole；The apocenosis passage is arranged in institute It states on drive end bearing bracket, it includes the leakage fluid dram and high-voltage oil cavity being connected, and the leakage fluid dram is to be opened in the drive end bearing bracket radially Through-hole, the high-voltage oil cavity is the annular groove being opened on the drive end bearing bracket end face, and the leakage fluid dram passes through the high pressure oil Chamber is connected to the assignment hole.

Further, the rolling bearing is needle bearing.

The invention has the advantages that by changing blade construction in the present invention, rolling bearing is set in rotor surface, it will Blade is changed into the swing that blade is cut with scissors around cylinder along the sliding of rotor slot, and change sliding friction is rolling friction, while cutting ferrule and rolling One end of blade is connected to rolling bearing outer surface by the annular groove between dynamic bearing, is improved vane stress situation, is avoided Traditional blades pump blade wears big and stuck phenomenon caused by radially slot slides, and improves the intensity of drive shaft, the machinery of pump Efficiency and service life, and compact-sized, handling ease.

Description of the drawings

Fig. 1 is the overall structure diagram of the present invention；

Fig. 2 is sectional view at A-A in Fig. 1；

Fig. 3 is the stator structure schematic diagram of the present invention；

Fig. 4 is the blade construction schematic diagram of the present invention；

Fig. 5 is the drive shaft structural schematic diagram of the present invention；

Fig. 6 is the ferrule structure schematic diagram of the present invention；

Fig. 7 is the preceding flow side front plate structure schematic diagram of the present invention；

Fig. 8 is the preceding flow side back panel construction schematic diagram of the present invention；

Fig. 9 is the rear flow side plate positive structure schematic of the present invention；

Figure 10 is the rear flow side plate structure schematic diagram of the present invention；

Figure 11 is the drive end bearing bracket structural schematic diagram of the present invention；

Figure 12 is the rear end cover structure schematic diagram of the present invention；

1. rear end cap, flow side plate after 2., 3. stators, 4. blades, flow side plate before 5., 6. drive end bearing brackets；7. cutting ferrule；8. Rotor；9. shaft；10. rolling bearing, 11. liquid sucting ports, 12 low pressure oil pockets, 21. circular grooves two, 22. assignment holes, 23. drains Valve, 24. liquid sucting valves, 31. cylinder grooves, 41. cylinders hinge, 42. trunnions, 51. axis holes two, 61. leakage fluid drams, 62. high-voltage oil cavities, 63. Axis hole three, 71. axis holes one, 72. circular grooves one.

Specific implementation mode

The present invention will be described in detail below with reference to the accompanying drawings and embodiments.Below in conjunction with attached drawing to the principle of the present invention It is described with feature, it should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application It can be combined with each other.The given examples are served only to explain the present invention, is not intended to limit the scope of the present invention.

Fig. 1-2 is please referred to, Fig. 1-2 schematically shows one embodiment of single-acting blade-type positive displacement pump in the present invention Structure, including stator 3, drive shaft, blade 4, cutting ferrule 7, flow side plate and end cap.

Centered on stator 3, device has flow side plate and end cap, stator 3 and flow side plate successively respectively for axial both sides It is enclosed pump chamber, blade 4, cutting ferrule 7 and drive shaft are all disposed in pump chamber, and 7 device of cutting ferrule is in drive shaft axial direction both sides, with drive Moving axis connects and can form annular groove between cutting ferrule 7 and drive shaft external cylindrical surface with drive shaft turns, and 4 one end of blade is hinged on On 3 inner wall of stator, the other end is installed in annular groove.

Referring to Fig. 3, stator 3 is cylindric and has coaxial tubular cavity, is equably provided in an axial direction on inner wall Multiple cylinder grooves 31, for hinged with blade 4；In the present embodiment, cylinder groove 31 is set as 9.

Fig. 4 schematically shows the structure of blade 4, one end of blade 4 is provided with and 31 matched cylinder of cylinder groove Hinge 41 makes blade 4 be formed with stator 3 hinged by the way that cylinder hinge 41 to be inserted into the cylinder groove 31 of 3 inner wall of stator；Blade 4 The other end is provided with cylindrical trunnion 42, and trunnion 42 is inserted into annular groove and is connected on the external cylindrical surface of the rotor 8, and can It is swung with the rotation of annular groove.Preferably, the diameter of trunnion 42 is equal with the radial width of above-mentioned annular groove.

Being hinged between stator 3 and blade 4, can also be by being provided with cylinder hinge, together in an axial direction on the inner wall of stator 3 When blade 4 one end be provided with and cut with scissors 41 matched cylinder grooves 31 with cylinder, cylinder hinge 41 is inserted into cylinder groove 31, to It is hinged to realize that blade 4 is formed with stator 3.

Drive shaft is rotatable to be arranged in the tubular cavity of stator 3, and referring to Fig. 5, drive shaft includes shaft 9 and consolidates Rotor 8 of the Dingan County in shaft 9, rotor 8 is driven by shaft 9 and is rotated therewith, as shown in Figure 1, the cylinder of shaft 9 and stator 3 Shape space is coaxially disposed, and the axis and the axis of rotor 8 of shaft 9 are parallel and misaligned, and distance between the two is eccentricity one, When rotor 8 is rotated with the rotation of shaft 9 in pump chamber, i.e., 8 axis of rotor is rotated around 3 axis of stator, in the process, rotor 8 The radial distance of external cylindrical surface and 3 inner wall of stator rotates and generating period sexually revises with shaft 9.

As shown in fig. 6, cutting ferrule 7 is cylindric, circular groove 1, circular groove are offered on an end face of cutting ferrule 7 One 72 diameter be more than rotor 8 diameter, the axis and the axis of cutting ferrule 7 of circular groove 1 are parallel and misaligned, the two it Between distance be known as eccentricity two, eccentricity two is equal with eccentricity one.One 72 notch of circular groove of two cutting ferrules 7 is relatively Device offers the axis hole 1 passed through for shaft 9, axis hole on the both sides of 8 axial direction of rotor, the end face of two cutting ferrules 7 One 71 is coaxial with 7 external cylindrical surface of cutting ferrule, and the both ends of shaft 9 are inserted into respectively in axis hole 1.The bottom of two circular grooves 1 Face and two end faces of rotor 8 respectively fit, and drive cutting ferrule 7 to rotate therewith when drive shaft turns, circular groove 1 it is interior Annular groove is formed between side wall and the external cylindrical surface of rotor 8, while circular groove 1 and rotor 8 are coaxial.

In the present solution, cutting ferrule 7 can be mounted on rotor 8（Such as installed by card slot and bayonet cooperation）, driven by rotor 8 Dynamic cutting ferrule 7 rotates, and is coordinated at this time using transition between shaft 9 and axis hole 1；Or by the way that cutting ferrule 7 is mounted in shaft, Such as make using interference fit connection between shaft 9 and axis hole 1, or using key connection or spline connection, driven by shaft 9 Cutting ferrule 7 rotates；Or combine above-mentioned two scheme, while driving cutting ferrule 7 to rotate by rotor 8 and shaft 9.

As is seen in figs 7-10, flow side plate is cylindric, one end face offers and 7 matched circular groove of cutting ferrule 2 21, offer multiple assignment holes 22 between flow side plate external cylindrical surface and the side of circular groove 2 21, assignment hole 22 along with The axial direction of stream side plate opens up, and penetrates through two end faces of flow side plate.Flow side plate includes preceding flow side plate 5（Such as Fig. 7-8）With Flow side plate 2 afterwards（Such as Fig. 9-10）, the center of preceding flow side plate 5 be further opened with 9 matched axis hole 2 51 of shaft, it is preceding It is equipped with tapping valve 23 in the assignment hole 22 of flow side plate 5, imbibition is equipped in the assignment hole 22 of the rear flow side plate 2 Valve 24；2 21 notch of circular groove of preceding flow side plate 5 and rear flow side plate 2 is relatively mounted on the axial both sides of the stator 3, Shaft 9 is inserted into axis hole 2 51, and two flow side plates are enclosed pump chamber with stator 3.

In said program, axis hole two can also be offered on rear flow side plate.

Device has the rotor 8 of cutting ferrule 7 to be placed in pump chamber, and can be freely rotated in pump chamber.The external cylindrical surface and circle of cutting ferrule 7 The inner wall of connected in star 2 21 is slidably matched, and two adjacent blades 4,8 external cylindrical surface of rotor, two cutting ferrules 7, preceding are matched at the inner wall of stator 3 Form the working chamber of sealing between stream side plate 5 and rear flow side plate 2, working chamber respectively on preceding flow side plate 5 and rear flow side plate 2 Assignment hole 22 be connected to.

If Figure 11-12 schematically shows the structure of end cap, end-cap fixture is enclosed in stator 3 with valve plate Pump chamber axial two outside, end cap includes drive end bearing bracket 6（Such as Figure 11）With rear end cap 1（Such as Figure 12）, drive end bearing bracket also opens at 6 center Equipped with 9 matched axis hole 3 63 of shaft, shaft 9 be pierced by from axis hole 3 63 after is connected with actuating unit.It can also divide Axis hole 3 63 is not opened up on drive end bearing bracket and rear end cap.

Drive end bearing bracket 6 is fixedly connected with front thrust plate, and rear end cap 1 is fixedly connected with rear thrust plate.The row of offering on drive end bearing bracket 6 Liquid channel, apocenosis passage include the leakage fluid dram 61 being connected and high-voltage oil cavity 62, and leakage fluid dram 61 is to be opened in drive end bearing bracket 6 radially Through-hole, high-voltage oil cavity 62 is the annular groove being opened on 6 axial end face of drive end bearing bracket, leakage fluid dram 61 by high-voltage oil cavity 62 with match Discharge orifice 22 is connected to；Imbibition channel is offered on rear end cap 1, imbibition channel includes the liquid sucting port 11 being connected and low pressure oil pocket, is inhaled Liquid mouth 11 is to be opened in the through-hole of rear end cap 1 radially, and low pressure oil pocket is the annular groove being opened on 1 axial end face of rear end cap, The liquid sucting port 11 is connected to by low pressure oil pocket with assignment hole 22.

In general, for convenient processing and manufacture, liquid sucting port 11 is both designed as circular hole, and aperture phase with leakage fluid dram 61 Together, but in order to reduce the resistance at liquid sucting port, it is ensured that oil suction is unobstructed, can increase the aperture of liquid sucting port 11, keep its through-flow Sectional area is more than the cross-sectional flow area of leakage fluid dram 61.

When shaft 9 rotates, while rotor 8 and cutting ferrule 7 being driven to rotate, due to 3 eccentric setting of rotor 8 and stator, rotor 8 The radial distance of external cylindrical surface and 3 inner wall of stator is sexually revised as shaft 9 rotates generating period, thus with movable vane piece 4 around cylinder Hinge 41 is swung along 8 external cylindrical surface of rotor, and adjacent blades 4 is also made to generate the instantaneous deflection being not quite similar around respective cylinder hinge 41 Angle, the volume so as to cause each working chamber change；When working chamber volume increases, its internal formation negative pressure, makes the work The liquid sucting valve 24 for making to be connected in chamber in the assignment hole 22 in imbibition channel is opened, and the working chamber is connected to imbibition channel, and inhales Enter liquid；When working chamber volume reduces, the work cavity pressure increases, and makes to be connected to matching for apocenosis passage in the working chamber Tapping valve 23 in discharge orifice 22 is opened, and the working chamber is connected to apocenosis passage, and liquid is discharged；8 axis every revolution of rotor, The volume of each working chamber increase and reduce it is each primary, to realize an imbibition and a drain.

The trunnion 42 of blade 4 is rolled along annular groove, can be born a part of lateral force of blade 4, be improved 4 lower end of blade Stressing conditions, alleviate the abrasion of blade 4 lower end and bearing outer ring.Annular groove works as blade to the effect of contraction of blade 4 simultaneously When 4 trunnion 42 is rolled along annular groove, annular groove is applied to 4 one support reactions of blade so that when 8 axis of rotor rotates, under blade 4 End can abut needle bearing outer ring, and it is excessive caused larger between blade 4 and stator 3 to avoid the pump centrifugal force of traditional blades 4 Abrasion, improves functional reliability, extends the service life of pump.

It since 4 lower end of blade is constrained by annular groove, is kept in contact always with rotor 8, it is no longer necessary to which centrifugal force is by leaf Piece 4 is thrown away, therefore can be worked compared with low engine speed range, to widen the range of speeds of the pump of blade 4.

Preferably, can be in 8 external cylindrical surface device rolling bearing 10 of rotor, rolling bearing 10 and 8 external cylindrical surface of rotor can be with Coordinated using transition, trunnion 42 is inserted into annular groove and is connected on the outer ring of rolling bearing 10, and can turn with annular groove It is dynamic and swings, difference of the diameter of trunnion 42 equal to annular groove and both rolling bearings radial width preferably on blade 4.This When, two adjacent blades 4, the inner wall of stator 3, the external cylindrical surface of rotor 8, two cutting ferrules 7, preceding flow side plate 5 and rear flow side plate 2 Between form the working chamber of sealing.Due to 3 eccentric setting of rotor 8 and stator, when rotor 8 is rotated around 3 axis of stator, with rotor 8 The rolling bearing 10 that is in contact of external cylindrical surface and then rotate together, external cylindrical surface, 10 outer ring of rolling bearing and the ring of rotor 8 The radial distance of shape slot and 3 inner wall of stator is sexually revised as shaft 9 rotates generating period, to cut with scissors 41 around cylinder with movable vane piece 4 It is swung along 10 external cylindrical surface of rolling bearing, the volume so as to cause each working chamber changes；When working chamber volume increases Its internal formation negative pressure, makes the liquid sucting valve 24 being connected in the working chamber in the assignment hole 22 in imbibition channel open, by institute when big It states working chamber to be connected to imbibition channel, and sucks liquid；When working chamber volume reduces, the work cavity pressure increases, and makes The tapping valve 23 being connected in the working chamber in the assignment hole 22 of apocenosis passage is opened, and the working chamber and apocenosis passage are connected It is logical, and liquid is discharged；8 axis every revolution of rotor, the volume of each working chamber increase and reduce it is each primary, to realize primary inhale Liquid and a drain.

Rolling friction between 8 external cylindrical surface of blade 4 and rotor is converted to rolling element and bearing by above-mentioned preferred embodiment Rolling friction between outer ring and/or inner ring further decreases the frictional force that blade 4 is subject to, and improve blade 4 uses the longevity Life.

10 preferred needle bearing of above-mentioned rolling bearing, needle bearing radial structure is compact, internal diameter size and load-carrying ability When identical as other types bearing, it is minimum to occupy annular slot space for minimum outer diameter.

In embodiment shown in FIG. 1, one rolling bearing 10 of device in drive shaft.In practical applications, according to difference The case where require, multiple rolling bearings 10 can also be provided in drive shaft.

By changing blade construction in the present invention, and rolling bearing is arranged in rotor surface, by blade along the sliding of rotor slot It is changed into the swing that blade is cut with scissors around cylinder, becomes sliding friction as rolling friction, while the annular groove between cutting ferrule and rolling bearing One end of blade is connected to rolling bearing outer surface, improves vane stress situation, avoids traditional blades pump blade along diameter Big and stuck phenomenon is worn caused by being slided to slot, improves the intensity of drive shaft, the mechanical efficiency of pump and service life, and It is compact-sized, handling ease.

In the description of the present invention, it is to be understood that, term "upper", "lower", "front", "rear", "left", "right", " perpendicular Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside", " circumferential direction " is side based on ... shown in the drawings Position or position relationship, are merely for convenience of description of the present invention and simplification of the description, do not indicate or imply the indicated device or member Part must have a particular orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples It closes and combines.

Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changes, replacing and modification.

Claims (8)

1. a kind of single-acting blade-type positive displacement pump, which is characterized in that including：

Stator（3）, there is tubular cavity；

Drive shaft, it is rotatable to be arranged in the stator（3）Tubular cavity in；The drive shaft includes rotor（8）With Mounted on the rotor（8）On shaft（9）, the shaft（9）With the stator（3）Tubular cavity it is coaxial, the rotor （8）Axis and the stator（3）The axis of tubular cavity is parallel and misaligned, and distance between the two is eccentricity one, institute State rotor（8）By the shaft（9）It drives and rotates；

Cutting ferrule（7）, it is cylindric, the cutting ferrule（7）An end face on offer circular groove one（72）, the circular groove One（72）Axis and the cutting ferrule（7）The axis of external cylindrical surface is parallel and misaligned, and distance between the two is eccentricity two, The eccentricity two is equal with the eccentricity one, the cutting ferrule（7）Two are set as, two cutting ferrules（7）Circle it is recessed Slot one（72）Notch relatively device in the rotor（8）Both sides in axial direction, two circular grooves one（72）'s Bottom surface respectively with the rotor（8）Two end faces fitting, two cutting ferrules（7）With described under the rotation of the drive shaft Rotor（8）It rotates synchronously, the circular groove one（72）Madial wall and the rotor（8）External cylindrical surface between formed annular Slot, the circular groove one（72）With the rotor（8）Coaxially；

Flow side plate is cylindric, one end face offers circular groove two（21）, the flow side plate external cylindrical surface and institute State circular groove two（21）Side between offer multiple assignment holes for running through the flow side plate both ends of the surface（22）, flow Side plate includes preceding flow side plate（5）With rear flow side plate（2）, the preceding flow side plate（5）The assignment hole（22）Inside it is equipped with Tapping valve（23）, the rear flow side plate（2）The assignment hole（22）It is interior to be equipped with liquid sucting valve（24）, the preceding flow side plate （5）And/or the rear flow side plate（2）Center be further opened with and the shaft（9）Matched axis hole two（51）；Before described Flow side plate（5）With the rear flow side plate（2）Two circular grooves two（21）It is described fixed that notch is relatively mounted on Son（3）Axial both sides, with the stator（3）It is enclosed pump chamber；

Multiple blades（4）, one end is along the stator（3）Axial direction be hinged on the stator（3）Inner wall on, and can be with respect to institute State stator（3）Rotation, the blade（4）The other end be provided with cylindrical trunnion（42）, the trunnion（42）It is inserted into the ring It can swing in shape slot and with the rotation of the annular groove；

The cutting ferrule（7）External cylindrical surface and circular groove two（21）Inner wall be slidably matched, two adjacent blades（4）, stator（3） Inner wall, rotor（8）External cylindrical surface, two cutting ferrules（7）, preceding flow side plate（5）With rear flow side plate（2）Between formed sealing Working chamber, the working chamber and the assignment hole（22）Connection；

End cap, fixing device is in axial two outside of the pump chamber, including drive end bearing bracket（6）And rear end cap（1）, the drive end bearing bracket（6） And/or rear end cap（1）On be further opened with and the shaft（9）Matched axis hole three（63）；The shaft（9）From the axis hole Three（63）Connect with actuating unit after being pierced by, in the drive end bearing bracket（6）With the rear end cap（1）On be respectively set apocenosis passage and Imbibition channel, the apocenosis passage and the imbibition channel pass through the assignment hole respectively（22）It is connected to the working chamber, institute State shaft（9）Drive the rotor（8）When rotation, the rotor（8）External cylindrical surface and the stator（3）Inner wall it is radial away from It is sexually revised from generating period, the rotor（8）Drive the blade（4）Around with stator（3）The articulated section of inner wall is swung.

2. single-acting blade-type positive displacement pump according to claim 1, which is characterized in that the stator（3）Inner wall upper edge Axially it is provided with cylinder groove（31）, the blade（4）One end be provided with and cylinder groove（31）Matched cylinder hinge（41）, institute State cylinder hinge（41）It is inserted into cylinder groove（31）It is interior, make the blade（4）With the stator（3）It is formed hinged.

3. single-acting blade-type positive displacement pump according to claim 1, which is characterized in that the stator（3）Inner wall upper edge Axially it is provided with cylinder hinge（41）, the blade（4）One end be provided with and cylinder cut with scissors（41）Matched cylinder groove（31）, institute State cylinder hinge（41）It is inserted into cylinder groove（31）It is interior, make the blade（4）With the stator（3）It is formed hinged.

4. single-acting blade-type positive displacement pump according to claim 1, which is characterized in that two cutting ferrules（7）In at least There are one end face on offer axis hole one（71）, the shaft（9）It is inserted into the axis hole one（71）It is interior.

5. single-acting blade-type positive displacement pump according to claim 4, which is characterized in that the shaft（9）With axis hole one （71）Between using transition coordinate or be interference fitted connection, using key connection or spline connection.

6. single-acting blade-type positive displacement pump according to claim 1, which is characterized in that the rotor（8）External device (ED) has Rolling bearing（10）, the blade（4）It is connected to the rolling bearing（10）Outer ring on.

7. single-acting blade-type positive displacement pump according to claim 1, which is characterized in that the imbibition channel is arranged described Rear end cap（1）On, it includes the liquid sucting port being connected（11）With low pressure oil pocket（12）, the liquid sucting port（11）It is described to be opened in Rear end cap（1）Through-hole radially, the low pressure oil pocket（12）To be opened in the rear end cap（1）Annular groove on end face, institute State liquid sucting port（11）Pass through the low pressure oil pocket（12）With the assignment hole（22）Connection；The apocenosis passage is arranged before described End cap（6）On, it includes the leakage fluid dram being connected（61）And high-voltage oil cavity（62）, the leakage fluid dram（61）For be opened in it is described before End cap（6）Through-hole radially, the high-voltage oil cavity（62）To be opened in the drive end bearing bracket（6）Annular groove on end face, it is described Leakage fluid dram（61）Pass through the high-voltage oil cavity（62）With the assignment hole（22）Connection.

8. single-acting blade-type positive displacement pump according to claim 6, which is characterized in that the rolling bearing（10）For needle roller Bearing.