CN210889359U - Two-stage sandwich type traveling wave piezoelectric centrifugal pump - Google Patents
Two-stage sandwich type traveling wave piezoelectric centrifugal pump Download PDFInfo
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- CN210889359U CN210889359U CN201921207248.XU CN201921207248U CN210889359U CN 210889359 U CN210889359 U CN 210889359U CN 201921207248 U CN201921207248 U CN 201921207248U CN 210889359 U CN210889359 U CN 210889359U
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Abstract
The utility model discloses a two-stage sandwich type traveling wave piezoelectric centrifugal pump contains base, stator, casing, goes up the rotor, down rotor, connecting axle, positive closed impeller, anti-closed impeller, first connecting tube spare, second and connects pipe fitting and four piezoceramics modules. During operation, four piezoelectric ceramic modules are excited to drive mass points on the inner side of the annular tooth to do micro-amplitude elliptical motion, the upper rotor and the lower rotor are driven simultaneously to further drive the positive and negative closed impellers to rotate along the same direction, the fluid obtains energy for the first time through the lower closed impeller, and then enters the upper closed impeller through the pipeline to obtain energy for the second time, so that twice fluid pressurization is completed. The utility model has simple and compact structure, easy sealing and miniaturization, accurate flow control, fast response, low noise, no electromagnetic interference and self-locking when power is off; compared with the conventional piezoelectric pump, the piezoelectric pump has the advantages of large flow and large output fluid pressure.
Description
Technical Field
The utility model relates to the field of fluid machinery, especially, relate to a two-stage sandwich formula traveling wave piezoelectric centrifugal pump.
Background
When the traditional centrifugal pump works, a motor needs to be arranged outside for driving, so that the motor is separated from the centrifugal pump, the structure is complex, the size is large, and the miniaturization is difficult; the fluid control precision of the centrifugal pump is not high, small flow cannot be supplied, and large noise is generated in the operation process; in addition, the operation of conventional motors generates electromagnetic pollution, which limits their direct application in fields sensitive to magnetic fields, such as medical treatment, health, and the like.
The conventional piezoelectric pump utilizes the inverse piezoelectric effect of a piezoelectric material to deform a piezoelectric sheet, so that the volume of a cavity of the pump is changed, liquid transmission is realized, the problems of low output pressure, low output flow and the like exist, the application range of the conventional piezoelectric pump is greatly limited, and therefore the problem of improving the output flow and the output fluid pressure of the piezoelectric pump is a difficult problem faced by the conventional piezoelectric pump.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the defect to involving in the technical background provides a method.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
the utility model discloses a two-stage sandwich type traveling wave piezoelectric centrifugal pump, which comprises a base, a stator, a shell, an upper rotor, a lower rotor, a connecting shaft, a positive closed impeller, a negative closed impeller, a first connecting pipe fitting, a second connecting pipe fitting and four piezoelectric ceramic modules;
the base is a cuboid, a first cylindrical groove is formed in the center of the upper end face of the base, a first circular boss is arranged on the upper end face of the base, the radius of the inner wall of the first circular boss is the same as the radius of the cross section of the first groove, and the first circular boss is coaxial with the first groove;
the stator comprises a driving disc, four rectangular beams and four cylindrical beams;
the center of the upper end face of the driving disc is provided with a cylindrical second groove, the center of the lower end face of the driving disc is provided with a cylindrical third groove, the upper end face of the driving disc is provided with a second annular boss, and the lower end face of the driving disc is provided with a third annular boss; the radius of the inner wall of the second circular boss is the same as the radius of the section of the second groove, the radius of the inner wall of the third circular boss is the same as the radius of the section of the third groove, and the second circular boss, the third circular boss, the second groove and the third groove are coaxial; a plurality of driving teeth are uniformly arranged on the second circular boss and the third circular boss; the center of the driving disc is provided with a through hole communicated with the second groove and the third groove;
one end of each rectangular beam is correspondingly and coaxially fixedly connected with one end of each cylindrical beam, the other end of each rectangular beam is fixedly connected with the side wall of the driving disc, so that the four rectangular beams and the four cylindrical beams are uniformly distributed on the outer side of the driving disc, and the stators are symmetrical about the center of the driving disc;
the shell is cylindrical, and a cylindrical fourth groove is formed in the center of the lower end face of the shell;
the stator is fixed on the base through four piezoelectric ceramic modules, so that the driving disc is pressed on the first circular boss and is sealed with the first circular boss, and the first groove contains the third circular boss; the shell is fixed on the base through a first connecting pipe fitting and a second connecting pipe fitting, so that the lower end of the shell is pressed on the driving disc and is sealed with the driving disc, and the fourth groove contains the second circular protrusion;
the upper rotor is in an inverted round table shape, the upper end face of the upper rotor is arranged in the fourth groove, the lower end face of the upper rotor is arranged in the second groove, and the conical surface of the upper rotor is abutted against each driving tooth on the second circular protrusion;
the lower rotor is in a circular truncated cone shape, the upper end face of the lower rotor is arranged in the third groove, the lower end face of the lower rotor is arranged in the first groove, and the conical surface of the lower rotor is abutted against each driving tooth on the third circular protrusion;
one end of the connecting shaft is fixedly connected with the center of the lower end face of the upper rotor, and the other end of the connecting shaft penetrates through a through hole in the center of the driving disc and is fixedly connected with the center of the upper end face of the lower rotor;
the positive closed type impeller is arranged on the upper end face of the upper rotor in the fourth groove, and the negative closed type impeller is arranged on the lower end face of the lower rotor in the first groove;
a base inflow port and a base outflow port are formed in the side wall of the base; the upper end surface of the base is provided with a connecting outflow port and a connecting inflow port; a shell body flow inlet and a shell body flow outlet are formed in the side wall of the shell body; a first cavity inflow port is formed in the center of the lower end face of the first groove; a second cavity inflow opening is formed in the center of the upper end face of the fourth groove; the base is provided with a communicated channel between the base inlet and the first cavity inlet; a first volute type flow channel matched with the reverse closed impeller is arranged on the inner wall of the first groove, and a communicated channel is arranged between the outlet of the first volute type flow channel and the connecting outlet of the base; one end of the first connecting pipe fitting is connected with the connecting outflow port, and the other end of the first connecting pipe fitting is connected with the shell inflow port; a second volute type flow channel matched with the positive closed impeller is arranged on the inner wall of the fourth groove, and a communicated channel is arranged between the outlet of the second volute type flow channel and the outlet of the shell; one end of the second connecting pipe fitting is connected with the shell outflow port, and the other end of the second connecting pipe fitting is connected with the connecting inflow port; a communicated channel is arranged between the connecting flow inlet and the base flow outlet of the base;
the centers of the end surfaces, far away from the driving disc, of the four cylindrical beams of the stator are provided with threaded holes, and the four piezoelectric ceramic modules are respectively connected with the four cylindrical beams of the stator in a one-to-one correspondence manner;
the piezoelectric ceramic module comprises a balancing weight, a first fixing block, a second fixing block, a first thin-wall beam, a second thin-wall beam, a fixing bolt, first to fourth ceramic plates and first to third electrode plates;
the balancing weight is cylindrical, and a through hole for the fixing bolt to pass through is formed in the axis of the balancing weight;
the first ceramic wafer, the second ceramic wafer, the third ceramic wafer, the fourth ceramic wafer and the fourth ceramic wafer are both two subarea circular ceramic wafers polarized along the thickness direction, and the polarization boundary of the two subareas is the diameter to form two subareas with opposite polarization directions;
the first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode plate are all annular;
the fixing bolt penetrates through the through hole of the balancing weight, sequentially penetrates through the fourth ceramic piece, the third electrode piece, the third ceramic piece, the second electrode piece, the second ceramic piece, the first electrode piece and the first ceramic piece and is in threaded connection with a threaded hole on the corresponding cylindrical beam;
the first thin-wall beam and the second thin-wall beam are symmetrically arranged on two sides of the balancing weight, wherein one end of the first thin-wall beam is fixedly connected with the side wall of the balancing weight, the other end of the first thin-wall beam is fixedly connected with the first fixing block, one end of the second thin-wall beam is fixedly connected with the side wall of the balancing weight, and the other end of the second thin-wall beam is fixedly connected with the second fixing block;
the first fixed block and the second fixed block are fixedly connected with the upper end face of the base;
the polarization boundary lines of the first ceramic chip and the second ceramic chip are parallel to the plane of the stator driving disk, and the polarization directions of the same side regions are opposite; and the polarization boundary lines of the third ceramic chip and the fourth ceramic chip are perpendicular to the plane where the stator driving disk is located, and the polarization directions of the same side regions are opposite.
As a further optimization scheme of the two-stage sandwich type traveling wave piezoelectric centrifugal pump of the utility model, the positive close type impeller comprises an upper cover plate and a plurality of upper blades in arc shape;
the center of the upper cover plate is provided with a through hole for inflow;
the upper blades are arranged between the upper end surface of the upper rotor and the upper cover plate and are fixedly connected with the upper rotor and the upper cover plate respectively; and the plurality of upper blades are uniformly distributed on the circumference, so that a plurality of arc-shaped flow channels with narrow inner parts and wide outer parts are formed between the upper end surface of the upper rotor and the upper cover plate.
As a further optimization scheme of the two-stage sandwich type traveling wave piezoelectric centrifugal pump of the utility model, the reverse-closed impeller comprises a lower cover plate and a plurality of lower blades in arc shape;
the center of the lower cover plate is provided with a through hole for inflow;
the lower blades are arranged between the lower end surface of the lower rotor and the lower cover plate and are fixedly connected with the lower rotor and the lower cover plate respectively; and the plurality of lower blades are uniformly distributed on the circumference, so that a plurality of arc-shaped flow channels with narrow inner parts and wide outer parts are formed between the lower end surface of the lower rotor and the lower cover plate.
The utility model adopts the above technical scheme to compare with prior art, have following technological effect:
the utility model integrates the driving device and the centrifugal pump into a whole, and has the advantages of simple structure, small volume, easy sealing, small flow, easy integrated installation of the base design and the like; the driving part simultaneously drives the two rotors to drive the two closed impellers to work, so that the fluid is pressurized twice, and the flow and the output fluid pressure of the piezoelectric centrifugal pump are improved; in addition, the driving part has the advantages of stable operation, low noise, no magnetic field generation, no magnetic field interference, power failure self-locking and the like, and the application range of the centrifugal pump is further widened.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional structure of a middle two-stage sandwich type traveling wave piezoelectric centrifugal pump according to the present invention;
FIG. 2 is a schematic cross-sectional view of a two-stage sandwich type traveling wave piezoelectric centrifugal pump according to the present invention;
FIG. 3 is a schematic diagram of a quarter-section three-dimensional structure of the base of the present invention;
FIG. 4 is a schematic view of the three-dimensional structure of the middle stator, the upper rotor and the lower rotor of the present invention;
fig. 5 is a schematic cross-sectional view of the flow passage structure inside the middle housing according to the present invention;
fig. 6 is a schematic three-dimensional structure of the housing of the present invention;
fig. 7 (a) and 7 (b) are schematic three-dimensional structures of a forward-closed impeller and a reverse-closed impeller of the present invention, respectively;
fig. 8 is a schematic view of the polarization direction and distribution of the first to fourth ceramic sheets in the middle piezoelectric ceramic module according to the present invention;
FIG. 9 is a schematic diagram of the application of electrical signals and bending vibration by two piezoelectric ceramic modules on a diagonal line in the present invention;
fig. 10 is a schematic diagram of the application of electric signals and bending vibration by two piezoelectric ceramic modules on another diagonal line in the present invention.
Wherein, 1-a base, 2-a stator, 3-a first ceramic plate, 4-a balancing weight, 5-a first fixed block, 6-a shell, 7-an upper rotor, 8-a lower rotor, 9-a connecting shaft, 10-a first thin-wall beam, 11-a first electrode plate, 12-a first cavity inlet, 13-a second cavity inlet, 14-a first circular boss, 15-a base inlet, 16-a base outlet, 17-a shell inlet, 18-a shell outlet, 19-a first volute flow channel, 20-a second volute flow channel, 21-an upper cover plate, 22-a blade, 23-a rectangular beam, 24-a cylindrical beam, 25-a driving disc, 26-a driving tooth, 27-a first connecting pipe fitting, 28-a second connecting pipe fitting, 29-positive closed impeller, 30-negative closed impeller, 31-connecting outflow port, 32-connecting inflow port.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
As shown in fig. 1, 2 and 3, the utility model discloses a two-stage sandwich type traveling wave piezoelectric centrifugal pump, which comprises a base, a stator, a shell, an upper rotor, a lower rotor, a connecting shaft, a positive closed type impeller, a negative closed type impeller, a first connecting pipe fitting, a second connecting pipe fitting and four piezoelectric ceramic modules;
the base is a cuboid, a first cylindrical groove is formed in the center of the upper end face of the base, a first circular boss is arranged on the upper end face of the base, the radius of the inner wall of the first circular boss is the same as the radius of the cross section of the first groove, and the first circular boss is coaxial with the first groove;
as shown in fig. 2 and 4, the stator comprises a driving disc, four rectangular beams and four cylindrical beams;
the center of the upper end face of the driving disc is provided with a cylindrical second groove, the center of the lower end face of the driving disc is provided with a cylindrical third groove, the upper end face of the driving disc is provided with a second annular boss, and the lower end face of the driving disc is provided with a third annular boss; the radius of the inner wall of the second circular boss is the same as the radius of the section of the second groove, the radius of the inner wall of the third circular boss is the same as the radius of the section of the third groove, and the second circular boss, the third circular boss, the second groove and the third groove are coaxial; a plurality of driving teeth are uniformly arranged on the second circular boss and the third circular boss; the center of the driving disc is provided with a through hole communicated with the second groove and the third groove;
one end of each rectangular beam is correspondingly and coaxially fixedly connected with one end of each cylindrical beam, the other end of each rectangular beam is fixedly connected with the side wall of the driving disc, so that the four rectangular beams and the four cylindrical beams are uniformly distributed on the outer side of the driving disc, and the stators are symmetrical about the center of the driving disc;
the shell is cylindrical, and a cylindrical fourth groove is formed in the center of the lower end face of the shell;
the stator is fixed on the base through four piezoelectric ceramic modules, so that the driving disc is pressed on the first circular boss and is sealed with the first circular boss, and the first groove contains the third circular boss; the shell is fixed on the base through a first connecting pipe fitting and a second connecting pipe fitting, so that the lower end of the shell is pressed on the driving disc and is sealed with the driving disc, and the fourth groove contains the second circular protrusion;
the upper rotor is in an inverted round table shape, the upper end face of the upper rotor is arranged in the fourth groove, the lower end face of the upper rotor is arranged in the second groove, and the conical surface of the upper rotor is abutted against each driving tooth on the second circular protrusion;
the lower rotor is in a circular truncated cone shape, the upper end face of the lower rotor is arranged in the third groove, the lower end face of the lower rotor is arranged in the first groove, and the conical surface of the lower rotor is abutted against each driving tooth on the third circular protrusion;
one end of the connecting shaft is fixedly connected with the center of the lower end face of the upper rotor, and the other end of the connecting shaft penetrates through a through hole in the center of the driving disc and is fixedly connected with the center of the upper end face of the lower rotor;
the positive closed type impeller is arranged on the upper end face of the upper rotor in the fourth groove, and the negative closed type impeller is arranged on the lower end face of the lower rotor in the first groove;
as shown in fig. 2, 5 and 6, a base inlet and a base outlet are formed on the side wall of the base; the upper end surface of the base is provided with a connecting outflow port and a connecting inflow port; a shell body flow inlet and a shell body flow outlet are formed in the side wall of the shell body; a first cavity inflow port is formed in the center of the lower end face of the first groove; a second cavity inflow opening is formed in the center of the upper end face of the fourth groove; the base is provided with a communicated channel between the base inlet and the first cavity inlet; a first volute type flow channel matched with the reverse closed impeller is arranged on the inner wall of the first groove, and a communicated channel is arranged between the outlet of the first volute type flow channel and the connecting outlet of the base; one end of the first connecting pipe fitting is connected with the connecting outflow port, and the other end of the first connecting pipe fitting is connected with the shell inflow port; a second volute type flow channel matched with the positive closed impeller is arranged on the inner wall of the fourth groove, and a communicated channel is arranged between the outlet of the second volute type flow channel and the outlet of the shell; one end of the second connecting pipe fitting is connected with the shell outflow port, and the other end of the second connecting pipe fitting is connected with the connecting inflow port; a communicated channel is arranged between the connecting flow inlet and the base flow outlet of the base;
the centers of the end surfaces, far away from the driving disc, of the four cylindrical beams of the stator are provided with threaded holes, and the four piezoelectric ceramic modules are respectively connected with the four cylindrical beams of the stator in a one-to-one correspondence manner;
the piezoelectric ceramic module comprises a balancing weight, a first fixing block, a second fixing block, a first thin-wall beam, a second thin-wall beam, a fixing bolt, first to fourth ceramic plates and first to third electrode plates;
the balancing weight is cylindrical, and a through hole for the fixing bolt to pass through is formed in the axis of the balancing weight;
the first ceramic wafer, the second ceramic wafer, the third ceramic wafer, the fourth ceramic wafer and the fourth ceramic wafer are both two subarea circular ceramic wafers polarized along the thickness direction, and the polarization boundary of the two subareas is the diameter to form two subareas with opposite polarization directions;
the first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode plate are all annular;
the fixing bolt penetrates through the through hole of the balancing weight, sequentially penetrates through the fourth ceramic piece, the third electrode piece, the third ceramic piece, the second electrode piece, the second ceramic piece, the first electrode piece and the first ceramic piece and is in threaded connection with a threaded hole on the corresponding cylindrical beam;
the first thin-wall beam and the second thin-wall beam are symmetrically arranged on two sides of the balancing weight, wherein one end of the first thin-wall beam is fixedly connected with the side wall of the balancing weight, the other end of the first thin-wall beam is fixedly connected with the first fixing block, one end of the second thin-wall beam is fixedly connected with the side wall of the balancing weight, and the other end of the second thin-wall beam is fixedly connected with the second fixing block;
the first fixed block and the second fixed block are fixedly connected with the upper end face of the base;
the polarization boundary lines of the first ceramic chip and the second ceramic chip are parallel to the plane of the stator driving disk, and the polarization directions of the same side regions are opposite; and the polarization boundary lines of the third ceramic chip and the fourth ceramic chip are perpendicular to the plane where the stator driving disk is located, and the polarization directions of the same side regions are opposite.
The axis of the first volute-type flow channel is parallel to the upper end face of the base, and the diameter of the first volute-type flow channel is gradually increased from the starting point to the connecting outflow port; fluid enters the first groove from the base flow inlet, is thrown out under the action of centrifugal force through the rotation of the lower rotor and enters the first volute type flow channel, partial kinetic energy of the fluid is converted into static pressure energy, and the first pressurization of the fluid is completed. The axis of the second volute-type flow channel is parallel to the upper end face of the base, and the diameter of the second volute-type flow channel is gradually increased from the starting point to the shell outflow port; the shell inlet receives fluid pumped out from the base connection outlet, the fluid enters the upper rotor through the first pipe fitting and is thrown out to complete secondary pressurization, and then the fluid flows out from the shell outlet, enters the base connection inlet and finally flows out from the base outlet; as shown in fig. 5, the second volute-type flow channel (the first volute-type flow channel is the same as the first volute-type flow channel) of the housing is a recessed divergent flow channel distributed along the inside of the circumference of the housing, the outlet height of the second volute-type flow channel is the same as the outlet of the closed impeller flow channel, and the fluid thrown out from the closed impeller enters the volute-type flow channel to convert part of kinetic energy of the fluid into static pressure energy, thereby realizing fluid pressurization.
Fig. 7 (a) is a forward and closed impeller, which includes an upper cover plate and a plurality of arc-shaped upper blades; the center of the upper cover plate is provided with a through hole for inflow; the upper blades are arranged between the upper end surface of the upper rotor and the upper cover plate and are fixedly connected with the upper rotor and the upper cover plate respectively; and the plurality of upper blades are uniformly distributed on the circumference, so that a plurality of arc-shaped flow channels with narrow inner parts and wide outer parts are formed between the upper end surface of the upper rotor and the upper cover plate.
Fig. 7 (b) shows a reverse closed impeller, which includes a lower cover plate and a plurality of arc-shaped lower blades; the center of the lower cover plate is provided with a through hole for inflow; the lower blades are arranged between the lower end surface of the lower rotor and the lower cover plate and are fixedly connected with the lower rotor and the lower cover plate respectively; and the plurality of lower blades are uniformly distributed on the circumference, so that a plurality of arc-shaped flow channels with narrow inner parts and wide outer parts are formed between the lower end surface of the lower rotor and the lower cover plate.
The positive and negative closed type impeller rotates clockwise when the stator works; the internal flow channel of the forward closed impeller is narrowed and widened along the anticlockwise direction, and the internal flow channel of the reverse closed impeller is narrowed and widened along the clockwise direction; the flow channel is beneficial to accelerating the fluid by the centrifugal action of the rotor in a rotating state.
One of the arc-shaped flow channels is taken as an example to illustrate the situation of the working fluid, and a positive arrow is the flow indicating direction of the working fluid; the arc-shaped flow channel in the initial state is immersed in fluid, an electric signal is applied to the piezoelectric ceramic module, a corresponding mode is excited to drive the rotor to rotate, working fluid in the arc-shaped flow channel is thrown out along the tangential direction of the outer edge of the arc-shaped flow channel under the action of centrifugal force due to relative motion and enters the first volute-shaped flow channel, and meanwhile, a low-pressure area is formed in the center of the closed impeller; under the action of pressure difference, fluid is sucked into the arc-shaped flow channel, and the fluid can be continuously sucked and thrown out by means of the rotation of the rotor, so that the first pressurization is continuously completed; then the fluid enters the upper rotor through the flow channel, is thrown out again due to the centrifugal action, enters the second volute flow channel, completes the second pressurization, and finally flows out from the base outflow port.
The utility model also discloses a driving method of two-stage sandwich formula traveling wave piezoelectric centrifugal pump contains following step:
as shown in fig. 8, the four groups of ceramic sheets are arranged the same from inside to outside. As shown in fig. 9, applying Usin (ω t) and-Usin (ω t) electrical signals to two piezoelectric ceramic modules on a diagonal line, where U is the peak value of the electrical signals, ω is the angular frequency, and t is the time, causes bending vibration to be generated on the rectangular cylindrical beam on the diagonal line, and the bending vibration on the diagonal line excites an out-of-plane bending vibration mode a on the stator driving disk; as shown in fig. 10, applying Ucos (ω t) and-Ucos (ω t) electrical signals to two piezoceramic modules on the other diagonal also produces bending vibrations on the rectangular cylindrical beam on that diagonal, which excite the out-of-plane bending vibration mode B on the stator drive disk; the mode A and the mode B are two isomorphic and orthogonal out-of-plane bending vibration modes; corresponding electric signals are simultaneously applied to the four groups of ceramic plates, and the mode A and the mode B are coupled with bending traveling waves with the same rotating direction on the stator driving disk, so that mass points of each driving tooth on the stator do micro-amplitude elliptical motion, and the two rotors are driven by friction under the action of pre-pressure to rotate clockwise; liquid is filled in the rotor in a working state, the upper rotor and the lower rotor rotate to drive the closed impeller to rotate to throw out the fluid, and the fluid is pumped to an outlet from the volute type flow channel.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A two-stage sandwich type traveling wave piezoelectric centrifugal pump is characterized by comprising a base, a stator, a shell, an upper rotor, a lower rotor, a connecting shaft, a forward closed impeller, a reverse closed impeller, a first connecting pipe fitting, a second connecting pipe fitting and four piezoelectric ceramic modules;
the base is a cuboid, a first cylindrical groove is formed in the center of the upper end face of the base, a first circular boss is arranged on the upper end face of the base, the radius of the inner wall of the first circular boss is the same as the radius of the cross section of the first groove, and the first circular boss is coaxial with the first groove;
the stator comprises a driving disc, four rectangular beams and four cylindrical beams;
the center of the upper end face of the driving disc is provided with a cylindrical second groove, the center of the lower end face of the driving disc is provided with a cylindrical third groove, the upper end face of the driving disc is provided with a second annular boss, and the lower end face of the driving disc is provided with a third annular boss; the radius of the inner wall of the second circular boss is the same as the radius of the section of the second groove, the radius of the inner wall of the third circular boss is the same as the radius of the section of the third groove, and the second circular boss, the third circular boss, the second groove and the third groove are coaxial; a plurality of driving teeth are uniformly arranged on the second circular boss and the third circular boss; the center of the driving disc is provided with a through hole communicated with the second groove and the third groove;
one end of each rectangular beam is correspondingly and coaxially fixedly connected with one end of each cylindrical beam, the other end of each rectangular beam is fixedly connected with the side wall of the driving disc, so that the four rectangular beams and the four cylindrical beams are uniformly distributed on the outer side of the driving disc, and the stators are symmetrical about the center of the driving disc;
the shell is cylindrical, and a cylindrical fourth groove is formed in the center of the lower end face of the shell;
the stator is fixed on the base through four piezoelectric ceramic modules, so that the driving disc is pressed on the first circular boss and is sealed with the first circular boss, and the first groove contains the third circular boss; the shell is fixed on the base through a first connecting pipe fitting and a second connecting pipe fitting, so that the lower end of the shell is pressed on the driving disc and is sealed with the driving disc, and the fourth groove contains the second circular protrusion;
the upper rotor is in an inverted round table shape, the upper end face of the upper rotor is arranged in the fourth groove, the lower end face of the upper rotor is arranged in the second groove, and the conical surface of the upper rotor is abutted against each driving tooth on the second circular protrusion;
the lower rotor is in a circular truncated cone shape, the upper end face of the lower rotor is arranged in the third groove, the lower end face of the lower rotor is arranged in the first groove, and the conical surface of the lower rotor is abutted against each driving tooth on the third circular annular protrusion;
one end of the connecting shaft is fixedly connected with the center of the lower end face of the upper rotor, and the other end of the connecting shaft penetrates through a through hole in the center of the driving disc and is fixedly connected with the center of the upper end face of the lower rotor;
the positive closed type impeller is arranged on the upper end face of the upper rotor in the fourth groove, and the negative closed type impeller is arranged on the lower end face of the lower rotor in the first groove;
a base inflow port and a base outflow port are formed in the side wall of the base; the upper end surface of the base is provided with a connecting outflow port and a connecting inflow port; a shell body flow inlet and a shell body flow outlet are formed in the side wall of the shell body; a first cavity inflow port is formed in the center of the lower end face of the first groove; a second cavity inflow opening is formed in the center of the upper end face of the fourth groove; the base is provided with a communicated channel between the base inlet and the first cavity inlet; a first volute type flow channel matched with the reverse closed impeller is arranged on the inner wall of the first groove, and a communicated channel is arranged between the outlet of the first volute type flow channel and the connecting outlet of the base; one end of the first connecting pipe fitting is connected with the connecting outflow port, and the other end of the first connecting pipe fitting is connected with the shell inflow port; a second volute type flow channel matched with the positive closed impeller is arranged on the inner wall of the fourth groove, and a communicated channel is arranged between the outlet of the second volute type flow channel and the outlet of the shell; one end of the second connecting pipe fitting is connected with the shell outflow port, and the other end of the second connecting pipe fitting is connected with the connecting inflow port; a communicated channel is arranged between the connecting flow inlet and the base flow outlet of the base;
the centers of the end surfaces, far away from the driving disc, of the four cylindrical beams of the stator are provided with threaded holes, and the four piezoelectric ceramic modules are respectively connected with the four cylindrical beams of the stator in a one-to-one correspondence manner;
the piezoelectric ceramic module comprises a balancing weight, a first fixing block, a second fixing block, a first thin-wall beam, a second thin-wall beam, a fixing bolt, first to fourth ceramic plates and first to third electrode plates;
the balancing weight is cylindrical, and a through hole for the fixing bolt to pass through is formed in the axis of the balancing weight;
the first ceramic wafer, the second ceramic wafer, the third ceramic wafer, the fourth ceramic wafer and the fourth ceramic wafer are both two subarea circular ceramic wafers polarized along the thickness direction, and the polarization boundary of the two subareas is the diameter to form two subareas with opposite polarization directions;
the first electrode plate, the second electrode plate, the third electrode plate and the fourth electrode plate are all annular;
the fixing bolt penetrates through the through hole of the balancing weight, sequentially penetrates through the fourth ceramic piece, the third electrode piece, the third ceramic piece, the second electrode piece, the second ceramic piece, the first electrode piece and the first ceramic piece and is in threaded connection with a threaded hole on the corresponding cylindrical beam;
the first thin-wall beam and the second thin-wall beam are symmetrically arranged on two sides of the balancing weight, wherein one end of the first thin-wall beam is fixedly connected with the side wall of the balancing weight, the other end of the first thin-wall beam is fixedly connected with the first fixing block, one end of the second thin-wall beam is fixedly connected with the side wall of the balancing weight, and the other end of the second thin-wall beam is fixedly connected with the second fixing block;
the first fixed block and the second fixed block are fixedly connected with the upper end face of the base;
the polarization boundary lines of the first ceramic chip and the second ceramic chip are parallel to the plane of the stator driving disk, and the polarization directions of the same side regions are opposite; and the polarization boundary lines of the third ceramic chip and the fourth ceramic chip are perpendicular to the plane where the stator driving disk is located, and the polarization directions of the same side regions are opposite.
2. The two-stage sandwich traveling-wave piezoelectric centrifugal pump according to claim 1, wherein the straight-closed impeller includes an upper cover plate and a plurality of upper blades in an arc shape;
the center of the upper cover plate is provided with a through hole for inflow;
the upper blades are arranged between the upper end surface of the upper rotor and the upper cover plate and are fixedly connected with the upper rotor and the upper cover plate respectively; and the plurality of upper blades are uniformly distributed on the circumference, so that a plurality of arc-shaped flow channels with narrow inner parts and wide outer parts are formed between the upper end surface of the upper rotor and the upper cover plate.
3. The two-stage sandwich traveling-wave piezoelectric centrifugal pump according to claim 1, wherein the counter-enclosed impeller includes a lower cover plate and a plurality of lower blades in an arc shape;
the center of the lower cover plate is provided with a through hole for inflow;
the lower blades are arranged between the lower end surface of the lower rotor and the lower cover plate and are fixedly connected with the lower rotor and the lower cover plate respectively; and the plurality of lower blades are uniformly distributed on the circumference, so that a plurality of arc-shaped flow channels with narrow inner parts and wide outer parts are formed between the lower end surface of the lower rotor and the lower cover plate.
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| CN110425149A (en) * | 2019-07-29 | 2019-11-08 | 南京航空航天大学 | A kind of two-stage sandwich traveling wave piezoelectricity centrifugal pump and its driving method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110425149A (en) * | 2019-07-29 | 2019-11-08 | 南京航空航天大学 | A kind of two-stage sandwich traveling wave piezoelectricity centrifugal pump and its driving method |
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