CN203730297U - Elliptic non-circular gear-driven six-blade differential pump - Google Patents
Elliptic non-circular gear-driven six-blade differential pump Download PDFInfo
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- CN203730297U CN203730297U CN201420052515.1U CN201420052515U CN203730297U CN 203730297 U CN203730297 U CN 203730297U CN 201420052515 U CN201420052515 U CN 201420052515U CN 203730297 U CN203730297 U CN 203730297U
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- 238000000034 method Methods 0.000 claims description 3
- 230000010349 pulsation Effects 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 description 8
- 238000007599 discharging Methods 0.000 description 7
- 238000005457 optimization Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
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- 238000005859 coupling reaction Methods 0.000 description 2
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Abstract
The utility model discloses an elliptic non-circular gear-driven six-blade differential pump. The existing differential pump has the problems of difficulty in optimizing pressure pulsation, liquid trapping and the like. A first elliptic non-circular gear and a second elliptic non-circular gear are respectively fixed to an input shaft; a first conjugate elliptic non-circular gear and a first impeller are respectively fixed to an output shaft, and the first conjugate elliptic non-circular gear meshes with the first elliptic non-circular gear; a second conjugate elliptic non-circular gear and a second impeller are respectively fixed to a shaft sleeve, and the shaft sleeve is flexibly sheathed on the output shaft; a pump casing is sequentially provided with a first liquid discharge port, a first liquid suction port, a second liquid discharge port, a second liquid suction port, a third liquid discharge port and a third liquid suction port in the circumferential direction; the first impeller and second impeller are respectively provided with three blades; and the inside of each blade is provided with a one-way relief valve. The differential pump has the advantages of large discharge capacity, stable flow rate and adjustable non-uniform velocity rules, and effectively solves the problem of liquid trapping.
Description
Technical Field
The utility model belongs to the technical field of the displacement pump, a blade differential pump is related to, concretely relates to six blade differential pumps of oval non-circular gear driven.
Background
Common liquid pumps for general-purpose machines are piston pumps, plunger pumps, diaphragm pumps, roller pumps and centrifugal pumps, among others: the piston (plunger) pump has higher outlet pressure, but requires reliable sealing between the piston and the cylinder barrel and large pressure fluctuation; the diaphragm pump can generate a relatively stable liquid flow when the diaphragm pump is multi-cylinder, but the structure is complex; the discharge capacity of the roller pump is uniform when the rotating speed is stable, the leakage rate is increased along with the increase of the pressure, and the liquid discharge rate and the efficiency of the pump are correspondingly reduced; the centrifugal pump has simple structure and easy manufacture, but has large displacement and low pressure, and is used for occasions with low requirements on working pressure. These pumps have their own drawbacks and do not adequately meet the constant flow, high pressure requirements of some specialty machinery requirements.
The existing differential pumps mainly comprise the following components according to different driving mechanisms:
the driving system of the rotary guide rod-gear type blade differential pump bears alternating load, gear meshing noise is generated, and impact noise can be caused when the clearance of each kinematic pair is large.
A universal joint gear mechanism drives a vane differential pump, and an included angle between an input shaft and an output shaft of the universal joint gear mechanism is a key parameter influencing the performance of the pump. The larger the angle, the larger the pump displacement, but as the angle increases, the more pulsation in the pump flow increases and the drive efficiency of the universal joint decreases.
The eccentric circle non-circular gear driving blade differential pump has the advantages that eccentric rate and deformation coefficient are mainly used as eccentric circle non-circular gear pitch curve adjusting parameters, adjusting amount is limited, adjusting precision is not high, transmission ratio optimization and adjustment are inconvenient, design is not flexible, further optimization design is not facilitated, and problems of pressure pulsation, trapped fluid and the like are difficult to optimize. Disclosure of Invention
The utility model aims at providing a six-blade differential pump driven by an elliptic non-circular gear, which has large displacement, high pressure, stable flow and compact structure; the elliptic non-circular gear pitch curve has six adjusting parameters, the unequal speed rule of the driving mechanism is easy to adjust, and the performance is convenient to optimize; through installing one-way relief valve in the blade, close closed chamber is opened when pressure exceeds the limit, effectively solves current differential pump trapping liquid problem.
The utility model discloses a drive assembly and differential pump part.
The driving component comprises a driving gear box, an input shaft, an output shaft, a first elliptic non-circular gear, a second elliptic non-circular gear, a first conjugate elliptic non-circular gear, a second conjugate elliptic non-circular gear and a shaft sleeve. The motor is connected with the input shaft through the coupler, and the input shaft is supported on two side walls of the driving gear box through two bearings; the first elliptic non-circular gear and the second elliptic non-circular gear are both fixedly arranged on the input shaft; two ends of the output shaft are respectively supported on the wall of the drive gear box and the wall of the pump shell through bearings, and the first conjugate elliptic non-circular gear is arranged on the output shaft and is meshed with the first elliptic non-circular gear; the second conjugate elliptic non-circular gear and the second impeller are fixedly connected on the shaft sleeve, the shaft sleeve is movably sleeved on the output shaft, and the second conjugate elliptic non-circular gear is meshed with the second elliptic non-circular gear.
The differential pump component comprises a pump shell, a first impeller, a second impeller and a one-way pressure relief valve. The pump shell is sequentially provided with a first liquid discharge port, a first liquid suction port, a second liquid discharge port, a second liquid suction port, a third liquid discharge port and a third liquid suction port along the circumferential direction; the first liquid discharge port, the second liquid discharge port and the third liquid discharge port are uniformly distributed along the circumference, and the first liquid suction port, the second liquid suction port and the third liquid suction port are uniformly distributed along the circumference; the first impeller is fixed on the output shaft; the first impeller and the second impeller are uniformly distributed with three blades along the circumferential direction, and the outer cambered surface of each blade is attached to the inner wall of the pump shell; the blades of the first impeller and the blades of the second impeller are arranged at intervals along the circumferential direction; and one-way pressure relief valves are arranged in all the blades, and the directions of the one-way pressure relief valves are consistent with the rotation direction of the impeller.
The parameters and the structures of the first elliptic non-circular gear and the second elliptic non-circular gear are completely consistent, the parameters and the structures of the first conjugate elliptic non-circular gear and the second conjugate elliptic non-circular gear are completely consistent, and the first elliptic non-circular gear, the second elliptic non-circular gear, the first conjugate elliptic non-circular gear and the second conjugate elliptic non-circular gear are three-order non-circular gears; the initial installation phase difference of the first elliptic non-circular gear and the second elliptic non-circular gear and the initial installation phase difference of the first conjugate elliptic non-circular gear and the second conjugate elliptic non-circular gear are both 60 degrees.
The pitch curve expression of the first elliptical non-circular gear is as follows:
wherein n is1The order of the first elliptic non-circular gear is 3; a is the major axis radius of the ellipse, k1Is the eccentricity of the ellipse and the eccentric ratio of the ellipse,is the rotation angle of the first elliptic non-circular gear,corresponding rotation angle of the first elliptic non-circular gearIn the radial direction.
The first elliptic non-circular gear and the first conjugate elliptic non-circular gear are three-order non-circular gears, and according to the non-circular gear meshing principle, when the first elliptic non-circular gear rotates 360 degrees, the first conjugate elliptic non-circular gear also rotates 360 degrees, so that an iterative formula for calculating the center distance a can be obtained:
taking an initial value a of the center distance0And (5) searching and calculating an accurate value of the center distance a by adopting a forward and backward method.
The transmission ratio of the first elliptic non-circular gear to the first conjugate elliptic non-circular gear is as follows:
wherein,n2the order of the first conjugate elliptic non-circular gear and the second conjugate elliptic non-circular gear is 3;
the transmission ratio of the second elliptic non-circular gear to the second conjugate elliptic non-circular gear is as follows:
and theta is the phase difference between the first elliptic non-circular gear and the second elliptic non-circular gear and takes 60 degrees.
The transmission ratio i of the first elliptic non-circular gear to the first conjugate elliptic non-circular gear21Equal to the transmission ratio i of the second elliptic non-circular gear to the second conjugate elliptic non-circular gear43Four different rotation angles can be obtainedCornerTake the minimum valueWhen the angular displacement of the first elliptic non-circular gear is as followsThe angular displacement of the second elliptical non-circular gear isThe turning angles of the first impeller and the second impeller are respectively as follows:
blade angle theta of first impeller and second impellerLeaf of Chinese characterAll the values are 25-35 degrees; the central angles of the first liquid discharge port, the first liquid suction port, the second liquid discharge port, the second liquid suction port, the third liquid discharge port and the third liquid suction port are equal and are larger than the blade angle theta of the bladeLeaf of Chinese character2-5 degrees in size. Center position angle of first liquid discharge port of pump casingCenter position angle of first liquid suction portCenter position angle of second liquid discharge portCenter position angle of second liquid suction portCenter position angle of third liquid discharge portCenter position angle of third liquid suction port
The utility model has the advantages that:
the utility model discloses an oval non-circular gear mechanism, oval non-circular gear pitch curve have six adjustment parameters, compare that existing deformation eccentric circle non-circular gear adjustable parameter is many, consequently oval non-circular gear is the speed-variable transmission law and adjusts easily, realizes the optimization of performances such as discharge capacity, pressure, the flow of differential pump easily. Through installing one-way relief valve in the blade, close closed chamber is opened when pressure exceeds the limit, effectively solves current differential pump trapping liquid problem. Because the differential pump liquid suction port and the liquid discharge port driven by the elliptic non-circular gear mechanism are uniformly distributed along the circumference, the radial balance is good, the non-constant speed transmission is rotary motion, the running is stable and reliable, the radial working load is balanced, and the pulsation controllability is good; the pump has the advantages of more blades, large displacement, simple shape of the inner surface of the pump shell and the blades and high volume efficiency.
The utility model discloses a core mechanism is the oval non-circular gear of two pairs of different installation phases, and the part is few, compact structure.
Drawings
FIG. 1 is a schematic diagram of the mechanism of the present invention;
FIG. 2 is a cross-sectional view of the overall construction of a differential pump assembly according to the present invention;
FIG. 3 is a schematic view of the meshing relationship of the pitch curve of the middle elliptic non-circular gear in the initial installation position of the present invention;
fig. 4 is a schematic view of the extreme positions of the blade according to the present invention.
In the figure: 1. the driving gear box comprises a driving gear box body, 2, an input shaft, 3, an output shaft, 4, a first elliptic non-circular gear, 5, a second elliptic non-circular gear, 6, a first conjugate elliptic non-circular gear, 7, a second conjugate elliptic non-circular gear, 8, a shaft sleeve, 9, a shaft coupling, 10, a motor, 11, a pump shell, 11-1, a first liquid discharging port, 11-2, a first liquid suction port, 11-3, a second liquid discharging port, 11-4, a second liquid suction port, 11-5, a third liquid discharging port, 11-6, a third liquid suction port, 12, a first impeller, 13, a second impeller, 14 and a one-way pressure release valve.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
As shown in fig. 1 and 2, an elliptical non-circular gear driven six-vane differential pump includes a drive member and a differential pump member.
The driving component comprises a driving gear box 1, an input shaft 2, an output shaft 3, a first elliptic non-circular gear 4, a second elliptic non-circular gear 5, a first conjugate elliptic non-circular gear 6, a second conjugate elliptic non-circular gear 7 and a shaft sleeve 8. The input shaft 2 and the output shaft 3 are respectively arranged at two ends of the gear box 1; the input shaft 2 is supported on two side walls of the driving gear box 1 through two bearings, the motor 10 transmits power to the input shaft 2 through the coupler 9, and the first elliptic non-circular gear 4 and the second elliptic non-circular gear 5 are both fixedly arranged on the input shaft 2; two ends of the output shaft 3 are respectively supported on the wall of the drive gear box 1 and the pump shell 11 through bearings, and the first conjugate elliptic non-circular gear 6 is fixedly arranged on the output shaft 3 and is meshed with the first elliptic non-circular gear 4; the second conjugate elliptic non-circular gear 7 and the second impeller 13 are both fixedly connected on a shaft sleeve 8, the shaft sleeve 8 is movably sleeved on the output shaft 3, and the second conjugate elliptic non-circular gear 7 is meshed with the second elliptic non-circular gear 5.
The differential pump assembly includes a pump housing 11, a first impeller 12, a second impeller 13, and a one-way relief valve 14. A first liquid discharge port 11-1, a first liquid suction port 11-2, a second liquid discharge port 11-3, a second liquid suction port 11-4, a third liquid discharge port 11-5 and a third liquid suction port 11-6 are sequentially formed in the pump shell 11 along the circumferential direction; the first liquid discharge port 11-1, the second liquid discharge port 11-3 and the third liquid discharge port 11-5 are uniformly distributed along the circumference, and the first liquid suction port 11-2, the second liquid suction port 11-4 and the third liquid suction port 11-6 are uniformly distributed along the circumference; the first impeller 12 is fixedly arranged on the output shaft 3; the first impeller 12 and the second impeller 13 are uniformly provided with three blades along the circumferential direction, and the outer arc surface of each blade is attached to the inner wall of the pump shell 11; the blades of the first impeller 12 and the blades of the second impeller 13 are arranged alternately along the circumferential direction, and a closed cavity is formed between every two adjacent blades; all the vanes are provided with one-way pressure relief valves 14, and two ends of each one-way pressure relief valve 14 are respectively communicated with the closed cavities on two sides of each vane; all the one-way pressure relief valves 14 are in the same direction as the rotation direction of the impeller.
As shown in fig. 3, the first elliptic non-circular gear 4 and the second elliptic non-circular gear 5 have the same structure, the first conjugate elliptic non-circular gear 6 and the second conjugate elliptic non-circular gear 7 have the same structure, and the first elliptic non-circular gear 4, the second elliptic non-circular gear 5, the first conjugate elliptic non-circular gear 6 and the second conjugate elliptic non-circular gear 7 are three-step non-circular gears; the initial installation phase angle of the first elliptic non-circular gear 4 is θ1The initial installation phase angle of the second elliptic non-circular gear 5 is θ2(ii) a The initial installation phase difference of the first elliptic non-circular gear 4 and the second elliptic non-circular gear 5 and the initial installation phase difference of the first conjugate elliptic non-circular gear 6 and the second conjugate elliptic non-circular gear 7 are all theta1-θ2The value of the differential rotation speed is 60 degrees, so that the differential rotation speed of the first impeller 12 and the second impeller 13 is realized, the volume of a closed cavity of the differential pump is periodically changed, liquid discharging is generated at the first liquid discharging port 11-1, the second liquid discharging port 11-3 and the third liquid discharging port 11-5, and liquid sucking is generated at the first liquid sucking port 11-2, the second liquid sucking port 11-4 and the third liquid sucking port 11-6. Because the non-uniform transmission of the elliptic non-circular gear is continuous, when the closed cavity is completely closed, the blades still rotate at a differential speed, so that the pressure of the closed cavity exceeds a limit value, the one-way pressure release valve 14 opens the adjacent closed cavity to release pressure, and liquid trapping is prevented.
The working principle of the six-blade differential pump driven by the elliptic non-circular gear is as follows:
the motor 10 transmits power to the first elliptic non-circular gear 4 and the second elliptic non-circular gear 5 through the coupling 9 and the input shaft 2. The first elliptic non-circular gear 4 is meshed with the first conjugate elliptic non-circular gear 6, the second elliptic non-circular gear 5 is meshed with the second conjugate elliptic non-circular gear 7, the first conjugate elliptic non-circular gear 6 transmits power to the first impeller 12 through the output shaft 3, the second conjugate elliptic non-circular gear 7 transmits power to the second impeller 13 through the shaft sleeve 8, and the shaft sleeve 8 is fixedly connected with the second conjugate elliptic non-circular gear 7 and movably sleeved on the output shaft 3. The two pairs of elliptic non-circular gear pairs are arranged in different phases, so that differential rotation of the first impeller 12 and the second impeller 13 is realized, and liquid suction and liquid discharge are realized.
The pitch curve expression of the first elliptical non-circular gear 4 is:
wherein n is1The order of the first elliptic non-circular gear is 3; a is the major axis radius of the ellipse, and the value is 100 mm; k is a radical of1The eccentricity of the ellipse is 0.5;is the rotation angle of the first elliptic non-circular gear,corresponding rotation angle of the first elliptic non-circular gearIn the radial direction.
The first elliptic non-circular gear 4 and the first conjugate elliptic non-circular gear 6 are three-order non-circular gears, and according to the non-circular gear meshing principle, when the first elliptic non-circular gear 4 rotates 360 degrees, the first conjugate elliptic non-circular gear 6 also rotates 360 degrees, and an iterative formula for calculating the center distance a can be obtained:
taking an initial value a of the center distance0And =120mm, and the accurate value of the center distance a is calculated by adopting a forward and backward method.
The transmission ratio of the first elliptic non-circular gear to the first conjugate elliptic non-circular gear is as follows:
wherein,n2the order of the first conjugate elliptic non-circular gear and the second conjugate elliptic non-circular gear is 3;
the transmission ratio of the second elliptic non-circular gear to the second conjugate elliptic non-circular gear is as follows:
and theta is the initial installation phase difference of the first elliptic non-circular gear and the second elliptic non-circular gear, and the value of theta is 60 degrees.
The transmission ratio i of the first elliptic non-circular gear 4 and the first conjugate elliptic non-circular gear 6 is set21Equal to the transmission ratio i of the second elliptic non-circular gear 5 and the second conjugate elliptic non-circular gear 743Four different rotation angles can be obtainedCornerTake the minimum valueAt the time, the angular displacement of the first elliptic non-circular gear 4 isAngle of displacement of the second elliptic non-circular gear 5 isThe rotation angles of the first impeller 12 and the second impeller 13 are respectively:
as shown in fig. 4, the blade angle θ of the first impeller 12 and the second impeller 13Leaf of Chinese characterAll values of (1) are 30 degrees; the sizes of the first liquid discharge port, the first liquid suction port, the second liquid discharge port, the second liquid suction port, the third liquid discharge port and the third liquid suction port are all larger than the blade angle theta of the bladeLeaf of Chinese character2 deg. smaller. Center position angle of first liquid discharge port of pump casingCenter position angle of first liquid suction portSecond drain outlet central position angle psiRow 2=ψRow 1+120 ° =180 ° and second liquid suction port central position angle ψSuction 2=ψSuction tube 1+120 ° =211 °, third drain port central position angle ψRow 3=ψRow 2+120 ° =300 °, third liquid suction port central position angle ψSuction 3=ψSuction 2+120°=331°。
Claims (1)
1. Six blade differential pump of oval non-circular gear drive, including driver part and differential pump part, its characterized in that:
the driving component comprises a driving gear box, an input shaft, an output shaft, a first elliptic non-circular gear, a second elliptic non-circular gear, a first conjugate elliptic non-circular gear, a second conjugate elliptic non-circular gear and a shaft sleeve; the motor is connected with the input shaft through the coupler, and the input shaft is supported on two side walls of the driving gear box through two bearings; the first elliptic non-circular gear and the second elliptic non-circular gear are both fixedly arranged on the input shaft; two ends of the output shaft are respectively supported on the wall of the drive gear box and the wall of the pump shell through bearings, and the first conjugate elliptic non-circular gear is arranged on the output shaft and is meshed with the first elliptic non-circular gear; the second conjugate elliptic non-circular gear and the second impeller are fixedly connected on the shaft sleeve, the shaft sleeve is movably sleeved on the output shaft, and the second conjugate elliptic non-circular gear is meshed with the second elliptic non-circular gear;
the differential pump component comprises a pump shell, a first impeller, a second impeller and a one-way pressure relief valve; the pump shell is sequentially provided with a first liquid discharge port, a first liquid suction port, a second liquid discharge port, a second liquid suction port, a third liquid discharge port and a third liquid suction port along the circumferential direction; the first liquid discharge port, the second liquid discharge port and the third liquid discharge port are uniformly distributed along the circumference, and the first liquid suction port, the second liquid suction port and the third liquid suction port are uniformly distributed along the circumference; the first impeller is fixed on the output shaft; the first impeller and the second impeller are uniformly distributed with three blades along the circumferential direction, and the outer cambered surface of each blade is attached to the inner wall of the pump shell; the blades of the first impeller and the blades of the second impeller are arranged at intervals along the circumferential direction; one-way pressure relief valves are arranged in all the blades, and the direction of the one-way pressure relief valves is consistent with the rotation direction of the impeller;
the parameters and the structures of the first elliptic non-circular gear and the second elliptic non-circular gear are completely consistent, the parameters and the structures of the first conjugate elliptic non-circular gear and the second conjugate elliptic non-circular gear are completely consistent, and the first elliptic non-circular gear, the second elliptic non-circular gear, the first conjugate elliptic non-circular gear and the second conjugate elliptic non-circular gear are three-order non-circular gears; the initial installation phase difference of the first elliptic non-circular gear and the second elliptic non-circular gear and the initial installation phase difference of the first conjugate elliptic non-circular gear and the second conjugate elliptic non-circular gear are both 60 degrees;
the pitch curve expression of the first elliptical non-circular gear is as follows:
wherein n is1The order of the first elliptic non-circular gear is 3; a is ellipseMajor axis radius of (k)1Is the eccentricity of the ellipse and the eccentric ratio of the ellipse,is the rotation angle of the first elliptic non-circular gear,corresponding rotation angle of the first elliptic non-circular gearRadial direction of (2);
the first elliptic non-circular gear and the first conjugate elliptic non-circular gear are three-order non-circular gears, and according to the non-circular gear meshing principle, when the first elliptic non-circular gear rotates 360 degrees, the first conjugate elliptic non-circular gear also rotates 360 degrees, so that an iterative formula for calculating the center distance a can be obtained:
taking an initial value a of the center distance0Searching and calculating an accurate value of the center distance a by adopting a forward-backward method;
the transmission ratio of the first elliptic non-circular gear to the first conjugate elliptic non-circular gear is as follows:
wherein,n2the order of the first conjugate elliptic non-circular gear and the second conjugate elliptic non-circular gear is 3;
the transmission ratio of the second elliptic non-circular gear to the second conjugate elliptic non-circular gear is as follows:
the theta is the phase difference between the first elliptic non-circular gear and the second elliptic non-circular gear, and the value is 60 degrees;
the transmission ratio i of the first elliptic non-circular gear to the first conjugate elliptic non-circular gear21Equal to the transmission ratio i of the second elliptic non-circular gear to the second conjugate elliptic non-circular gear43Four different rotation angles can be obtainedCornerTake the minimum valueWhen the angular displacement of the first elliptic non-circular gear is as followsThe angular displacement of the second elliptical non-circular gear isThe turning angles of the first impeller and the second impeller are respectively as follows:
blade angle theta of first impeller and second impellerLeaf of Chinese characterAll the values are 25-35 degrees; the first liquid discharge port, the first liquid suction port, the second liquid discharge port, the second liquid suction port, the third liquid discharge port and the third liquid suction port have the same size, and are larger than the blade angle theta of the bladeLeaf of Chinese character2-5 degrees smaller; in the first discharge port of the pump casingAngle of heart positionCenter position angle of first liquid suction portCenter position angle of second liquid discharge portCenter position angle of second liquid suction portCenter position angle of third liquid discharge portCenter position angle of third liquid suction port
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420052515.1U CN203730297U (en) | 2014-01-27 | 2014-01-27 | Elliptic non-circular gear-driven six-blade differential pump |
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| CN201420052515.1U CN203730297U (en) | 2014-01-27 | 2014-01-27 | Elliptic non-circular gear-driven six-blade differential pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742404A (en) * | 2014-01-27 | 2014-04-23 | 浙江理工大学 | Six-blade differential pump driven by elliptic non-circular gears |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742404A (en) * | 2014-01-27 | 2014-04-23 | 浙江理工大学 | Six-blade differential pump driven by elliptic non-circular gears |
| CN103742404B (en) * | 2014-01-27 | 2015-07-22 | 浙江理工大学 | Six-blade differential pump driven by elliptic non-circular gears |
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