CN112412759A - Mixing, stirring and pumping integrated valveless piezoelectric pump - Google Patents
Mixing, stirring and pumping integrated valveless piezoelectric pump Download PDFInfo
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- 238000003756 stirring Methods 0.000 title claims abstract description 42
- 238000005086 pumping Methods 0.000 title claims abstract description 30
- 238000002156 mixing Methods 0.000 title abstract description 31
- 239000002131 composite material Substances 0.000 claims abstract description 35
- 230000000903 blocking effect Effects 0.000 claims abstract description 32
- 230000002829 reductive effect Effects 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims 9
- 239000012530 fluid Substances 0.000 abstract description 70
- 230000000694 effects Effects 0.000 abstract description 17
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- 230000002441 reversible effect Effects 0.000 description 37
- 238000000034 method Methods 0.000 description 9
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000007789 sealing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
- F04B43/043—Micropumps
- F04B43/046—Micropumps with piezoelectric drive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F35/32—Driving arrangements
- B01F35/32005—Type of drive
- B01F35/32015—Flow driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0027—Special features without valves
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Abstract
The invention provides a mixing, stirring and pumping integrated valveless piezoelectric pump which comprises a pump cover, a pump body, a pump seat and a fixed frame, wherein a pump cavity is enclosed by a piezoelectric vibrator, the pump body and the pump seat, an inlet and an outlet are formed in the pump body, a stirrer is arranged in the outlet, a composite fluid blocking body group is arranged on the pump seat, and the composite fluid blocking body group comprises a fluid blocking body, a first flow guide plate, a second flow guide plate and a third flow guide plate. The inlet and outlet flow channels of the valveless piezoelectric pump are multi-inlet and multi-outlet flow channels, so that the valve structure is a composite choking fluid group which is easy to generate vortex circuitous flow, an embedded stirrer is additionally arranged at the outlet, the mixing effect is further improved, theoretical analysis and experimental research verify that the novel valveless mixing pump can better realize mixing, stirring and pumping of fluid, and the conveying flow is obviously improved compared with the conventional valveless pump.
Description
Technical Field
The invention belongs to the technical field of fluid machinery, and particularly relates to a mixing, stirring and pumping integrated valveless piezoelectric pump.
Background
A valveless piezoelectric pump (valveless pump for short) as a new-type fluid driver features that the inverse piezoelectric effect of piezoelectric ceramic is used to deform the vibrator to drive the volume of pump cavity to change regularly, and the valve structure including flow tube and flow-blocking body with asymmetric structure is used to drive fluid transmission. Compared with the traditional pump, the valveless pump does not need a driving motor, does not generate an electromagnetic field and self pollution (no lubrication and no abrasion) during working, and has the advantages of simple structure, low energy consumption, low output flow, good controllability, easy integration and the like; meanwhile, due to the valveless characteristic of the valveless pump, no moving part is arranged in the pump body except the piezoelectric driver, so that the structural size of the pump can be theoretically very small, and the miniaturization requirement is easy to realize. The valveless pump has wide application prospect in the fields of precise instruments, biochemistry, medical treatment, aerospace, micro-electro-mechanical systems and the like due to the unique advantages of the valveless pump. As a valveless pump of a micro-flow pump, more and more researchers are attracted to carry out extensive and intensive research on the pumping performance and the application effect of the valveless pump.
The valve-actuating structure in the valveless pump can make the resistance of the liquid sucked or discharged from the inlet and the outlet in the pump cavity be different so as to form flow resistance difference, so that it has the function of valve and can play the role of valve in the valveless pump. Along with the continuous release of novel structure valveless pump, also appeared sending "valve" structure of different shapes, if: double-ring pipeline (Tesla valve), conical flow pipe, elliptic combined pipe, Y-shaped flow pipe, multi-stage Y-shaped flow pipe, asymmetric cavity bottom, hemispherical segmental fluid and the like. The multi-stage Y-shaped flow pipe, the asymmetric cavity bottom, the hemispherical segment and other structures can enable fluid in the pump cavity to generate a large amount of fluid vortexes after flowing around the characteristic structures, so that the valveless pump with the valve has the function of mixing the fluid while conveying the fluid, namely, the liquid can be mixed and conveyed. However, for the pump structure with the multi-stage Y-shaped flow tube and the asymmetric cavity bottom, the process of the flow tube structure and the cavity bottom structure is complex, and the Y-shaped flow tube and the asymmetric cavity bottom of the valve are integrated with the pump body, so that if the problem of influencing or interfering the mixed pumping effect occurs during the pump operation, the pump needs to be replaced, and the manufacturing and maintenance cost is high; the mixed pumping effect of the pump can be greatly influenced by the factors such as the arrangement mode, the flow direction, the incident flow angle and the like of the hemispherical segment, and meanwhile, the flow blocking bodies such as the hemispherical segment are fixed on the base of the pump through bonding, so that the process is complicated and the replacement is inconvenient. And the number of the inlet and outlet pipe orifices of the valveless pump structure does not reach multiple-in and multiple-out, thereby greatly limiting the pumping performance.
Disclosure of Invention
The invention provides a mixing, stirring and pumping integrated valveless piezoelectric pump, aiming at simplifying the valveless pump process and enriching the structure and the function of the valveless pump.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a mixing, stirring and pumping integrated valveless piezoelectric pump which comprises a pump cover, a pump body, a piezoelectric vibrator and a pump seat, wherein the piezoelectric vibrator, the pump body and the pump seat are sequentially connected to enclose a pump cavity; the composite baffle body group is arranged between the outlet and the inlet and comprises a baffle body, two first baffle plates, two second baffle plates and a plurality of third baffle plates, wherein the end face of the baffle body facing the inlet is a spherical surface, the end face of the baffle body facing the outlet is a plane, the two first baffle plates are oppositely arranged, the two second baffle plates are oppositely arranged, the third baffle plates are in a V-shaped structure, and the tip of each third baffle plate faces the inlet; the first guide plates and the second guide plates are sequentially arranged along the direction from the inlet to the outlet, the distance between the two first guide plates is gradually reduced, the distance between the two second guide plates is gradually reduced, the end parts, close to the first guide plates, of the second guide plates are further provided with bending parts bent towards the direction of the first guide plates, the flow blocking bodies are located between the two first guide plates, and the third guide plates are located between the two second guide plates.
Further, the third guide plate is also arranged between the two first guide plates.
Furthermore, the pump body is provided with a plurality of inlets, and the inlets are distributed in an area formed between extension lines of the two first guide plates.
Furthermore, the first guide plate is close to one side of the inlet, and the second guide plate is positioned at the outer side of the first guide plate on the corresponding side.
Furthermore, the first guide plate and the second guide plate respectively enclose two groups of conical areas which symmetrically shrink along the line of the sphere center, and the first guide plate and the third guide plate, and the second guide plate and the third guide plate respectively form two groups of conical channels which are symmetrically distributed along the line of the sphere center.
Furthermore, the spherical surface of the flow blocking body is opposite to and obliquely opposite to the inlet, and the opening direction of the third flow guide plate is opposite to and obliquely opposite to the outlet.
Furthermore, a fixed frame is arranged on the pump seat, and the flow blocking body, the first flow guide plate, the second flow guide plate and the third flow guide plate are all inserted into a groove arranged on the fixed frame.
Further, the outlet is also provided with a stirrer; the agitator includes back shaft, fixed strip, embedding cover, commentaries on classics cover and stirring vane, the embedding cover is embedded in the export, the fixed strip is fixed to the one end of embedding cover, the back shaft with the fixed strip is connected, the rotatable setting of commentaries on classics cover is in on the back shaft, be provided with on the commentaries on classics cover stirring vane.
Further, the stirring blade is arranged obliquely with respect to the axis of the support shaft.
Further, the stirring blade is arranged perpendicular to the axis of the support shaft.
Compared with the prior art, the invention has the advantages and beneficial effects that: the invention provides a mixing, stirring and pumping integrated valveless piezoelectric pump with the research aim of realizing large-flow and high-efficiency mixed liquid delivery, and the pump structure is different from the prior valveless pump structure and has the remarkable characteristics that: the inlet and outlet flow passages are multi-inlet and multi-outlet flow passages; secondly, the 'valve' structure is a composite choking body group which is easy to generate vortex circuitous flow; the pump and the valve are designed into separate structures which are independent of each other and convenient to replace and optimize; and fourthly, an embedded stirrer is added at the outlet, so that the mixing effect is further improved, and the stirring effect is achieved, particularly for turbid liquid or emulsion with high concentration. The invention verifies that the novel valveless mixing pump can better realize the mixing, stirring and pumping of liquid through theoretical analysis and experimental research, and the conveying flow is obviously improved compared with the existing valveless pump. The research result lays a foundation for the application of the valveless pump in the field of microfluid mixed transmission, simplifies the valveless pump process and enriches the structure and the function of the valveless pump. In addition, the mixing and stirring valveless pump is combined with the traditional pump, and can also be used for accurately spraying medicaments and nutritional agents (water, fertilizers and medicines) for crop cultivation, orchard flower thinning and the like.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic structural diagram of a composite bluff body;
FIG. 4 is a perspective view of the pump chamber;
FIG. 5 is a schematic view of the structure of the stirrer of the type 1;
FIG. 6 is a schematic view of a structure of a 2 nd stirrer;
FIG. 7 is a 45 ° cloud diagram of forward and reverse pressure distributions of a single V-block, (a) a forward pressure cloud diagram, and (b) a reverse pressure cloud diagram;
FIG. 8 is a schematic view of fluid flow during a pump cycle; (a) fluid flow during suction, (b) fluid flow during scheduling;
FIG. 9 is a cloud chart of velocity and pressure of the composite bluff body around the flow field; (a) forward, reverse velocity trace profiles, (b) forward, reverse static pressure trace profiles;
in the figure, the pump comprises a pump cover 1, a pump cover 2, a piezoelectric vibrator 3, a sealing ring 4, a pump body 5, a pump seat 6, a fixing frame 7, an outlet 8, a composite fluid blocking body group 801, a fluid blocking body 802, a first fluid blocking body 803, a second fluid blocking body 804, a third fluid blocking body 9, an inlet 10, a stirrer 101, a support shaft 102, a fixing strip 103, an embedding sleeve 104, a rotating sleeve 105, stirring blades 106 and a retaining ring.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the following specific examples.
Referring to fig. 1 to 9, the present invention provides a mixing, stirring and pumping integrated valveless piezoelectric pump, which includes a pump cover 1, a piezoelectric vibrator 2, a sealing ring 3, a pump body 4, a pump seat 5, a fixing frame 6, a composite fluid blocking body group 8 and a stirrer 10. The piezoelectric vibrator 2, the pump body 4 and the pump seat 5 enclose a pump cavity, the piezoelectric vibrator 2 is elastically pressed on a shoulder of the pump body 4 through the pump cover 1 and the sealing ring 3, and the pump seat 5 is fixed with the bottom of the pump body 4 through transition fit by the sealing ring 3.
In particular, the pump body 4 is provided with 3 inlets 9 and 3 outlets 7. The pump base 5 is provided with the composite bluff body group 8, and each bluff body in the composite bluff body group 8 is symmetrically arranged along a horizontal axis at the bottom of the pump base 5. As shown in fig. 3, the composite baffle group 8 includes a baffle 801, 2 first baffles 802, 2 second baffles 803, and 3 third baffles 804. The flow blocking body 801 corresponds to the inlet 9, the third guide plates 804 are sequentially arranged on the other side of the flow blocking body 801, and the first guide plate 802 and the second guide plate 803 are arranged on both sides of the third guide plate 804. The first baffle 802 is on the side near the inlet and the second baffle 803 is on the other side of the first baffle 802. The two first deflectors 802 and the two second deflectors 803 respectively enclose two groups of tapered areas which symmetrically shrink along the spherical center line, and the first deflectors 802 and the third deflectors 804, and the second deflectors 803 and the third deflectors 804 respectively form two groups of tapered channels a, b and c which are symmetrically distributed along the spherical center line. The spherical surface of the flow blocking body 801 faces and obliquely faces the inlet 9, the opening direction of the third flow guide plate 804 faces and obliquely faces the outlet 7, and all parts of the composite flow blocking body group 8 are inserted into corresponding grooves of the fixed frame 6 according to determined positions.
The flow direction of the liquid in fig. 3 is set by combining the composite bluff body group 8 arranged in the pump cavity in fig. 2: the flow of water from left to right is set to a forward flow, and conversely, the flow from right to left is set to a reverse flow. The water flow flows in along the inlet 9, flows through a conical area and flow channels a, b and c surrounded by the composite choked flow body group 8, and finally flows out along the outlet 7 in a forward direction; conversely, the water flows in from the outlet 7, flows in a circuitous way in the area defined by the outer contour of the bluff body 8 and the wall surface of the pump cavity, flows into the inlet area through the flow passages c, b and a, and flows out from the inlet 9 in a reverse direction. When the pump works, fluid flows in the forward direction and sequentially passes through the conical flow passages a, b and c, the flow passages and the profile features reduce the forward flow-bypassing resistance, and when the fluid flows in the reverse direction and flows through the ports c, b and a of the conical expansion passage, the flow passages and the profile features have the tendency of preventing the fluid from flowing in the reverse direction, and the reverse flow has the tendency of increasing the flow-bypassing resistance. The liquid sucked into the pump cavity in fig. 2 generates collision and vortex when flowing through the composite choking body group 8, primary mixing of the liquid can be realized under the pushing of the vortex, and full mixing, stirring and conveying are realized through the stirring of the stirrer at the outlet flow pipe. The flow resistance difference between the reverse direction and the forward direction when the fluid flows through the composite fluid blocking body group 8 reversely and forwardly is larger than zero, which shows that the composite fluid blocking body group 8 can be used as a valve structure, and the fluid can be driven to flow into and out of the pump cavity by matching with the periodic vibration of the piezoelectric vibrator, so that the function of transmitting the fluid is achieved. The composite choking body group 8 is easy to generate vortex circuitous flow, each part is independent, the replacement and the optimization recombination are convenient, the mixing, the stirring and the pumping of liquid can be better realized, and the conveying flow rate is obviously improved compared with the existing valveless pump.
Compared with the traditional valveless pump, the novel mixing valveless pump changes the valve structure in the traditional valveless pump due to the fact that the special composite choke body group 8 causes the valve structure, and is easy to improve pumping performance and vortex mixing effect; meanwhile, the inlet flow pipes and the outlet flow pipes are designed into a plurality of pipes, so that the pumping performance is improved, and the requirements of a plurality of working modes such as pumping single liquid, two-phase or three-phase mixed liquid, multi-path output and the like can be met; the composite group fluid structure is fixed through the fixing frame, so that the separation of the valve structure and the pump body is realized, the pump cover in threaded connection is matched, the disassembly and the replacement of the valve part are convenient to realize, the design of optimization, recombination and the like of the valve part is easy to carry out, the pump structure and the process are simplified, and the use and maintenance cost of the pump is reduced. The liquid in the pump cavity is mixed with different phase liquids after passing through the flow composite fluid blocking body group 8, the mixing effect is further improved through the outlet stirrer, and meanwhile, the liquid or turbid liquid with large concentration difference can be stirred.
The flow resistance difference and the vortex intensity formed by the valve structure influence the pump flow and the mixing effect respectively. For a choke-type valveless pump, namely, the larger the flow resistance difference of the reverse and forward circumambient flow chokes is, the stronger the liquid pumping capacity is; meanwhile, the stronger the intensity of the vortex and the pulsation generated by the fluid flow around the fluid blocking body, the better the effect of mixing the fluid. Therefore, the development of a bluff body capable of forming large flow resistance difference and multiple vortices is the key for researching a high-performance hybrid piezoelectric pump.
1) Differential analysis of reverse and forward flow resistance
Now, observing the composite bluff body group 8 from the forward direction of fluid flow, firstly, the bluff body 801 as the front bluff body has smooth and smooth surface characteristics, has small fluid resistance to forward streaming and plays roles of shunting and guiding fluid; the first baffle 802, the second baffle 803 and the third baffle 804 as the rear baffles form contracted conical flow passages a, b and c, and the flow area of the fluid is a contracted conical area formed by two pairs of the first baffle 802 and the second baffle 803 of the rear baffles, and the flow passages and the profile characteristics have the tendency of reducing the resistance of forward flowing. Viewing the baffle group from the reverse direction of fluid flow, as opposed to the forward flow, first sees the third baffle's inner concave surface and the c, b, a ports with tapered expanding channels, followed by the fluid flow area defined by the second baffle 803 outer contour, the first baffle 802 outer contour and the pump body wall, and finally the spherical section of the steep end face, these contour features combine to have the tendency to stop the reverse flow of fluid, forcing most of the fluid to bypass only the majority of the area defined by the pump chamber wall and the first, second and third baffles 802, 803, 804 outer contour near the outlet end, so the reverse flow has the tendency to increase the bypass resistance. Therefore, when the pump sucks or discharges fluid through the inlet 9 and the outlet 7, a large reverse and forward flow resistance difference can be formed to achieve the function of conveying the fluid. Meanwhile, as the fluid flows through the non-streamlined contours such as the taper angle with different angles, the conical channel, the conical concave vortex, the corner, the steep wall surface and the like in the flow direction, stronger vortex and turbulence phenomena can be generated, and the mixing of different phases of liquid is favorably realized.
2) Specific analysis and comparison of flow resistance difference
a) Flow resistance analysis of the first baffle 802 and the second baffle 803
As shown in fig. 2, the flow paths a, b, and c formed by the first baffle 802, the second baffle 803, and the third baffle 804 are tapered flow paths that are contracted when viewed from the forward flow direction, and are tapered flow paths that are expanded when viewed from the reverse flow direction. In fig. 2, the included angles of the tapered flow channels formed by the first flow guide plate 802, the second flow guide plate 803 and the third flow guide plate 804 are all between 20 ° and 120 °, and the flow resistance F of the fluid flowing through the contracted tapered flow channels a, b and c in the forward directionzi(i ═ a, b, c) smaller than the flow resistance F in the opposite direction through the expanding conical flow channels a, b, cfi(i ═ a, b, c). Namely:
the parameters of the included angle between the positions of the first baffle 802 and the second baffle 803 and the angle of the third baffle 804 are as follows: if the included angle between 2 first deflectors 802 is alpha2The angle between the two second deflectors 803 is shown as alpha3Expressed that the angle is less than or equal to 80 degrees2≤120°，60°≤α3The forward flow resistance is ensured to be smaller than the reverse flow resistance in the interval of less than or equal to 120 degrees, and the fluid vortex is obvious; the number of the third guide plate corresponding to the third guide plate 804 is 3, if the included angle is alpha4Expressed as alpha is more than or equal to 30 DEG4Within the range of less than or equal to 90 degrees, the third guide plate causes whirlpool and the water conservancy diversion effect is all better, and the value is 70 degrees, 80 degrees, 45 degrees in proper order from left to right in the contained angle of the third guide plate 804 in the text.
b) Third baffle 804 flow resistance analysis
The flow field of the third flow guide plate 804 (taking an included angle of 45 degrees as an example) is numerically simulated by using fluid dynamics analysis software ansys cfd, and the forward and reverse pressure distribution conditions in the flow field are analyzed.
Comparing the forward and backward pressure distribution diagrams in fig. 7, it can be seen that a local high pressure region is formed in the groove of the third baffle during backward flow, turbulence and vortex are generated in the high pressure region, the flow field is complex, the pressure loss is large, that is, the backward flow blocking effect of the third baffle 804 is greater than that of the forward flow.
Simulation results show that the flow resistance is large in the reverse direction and small in the forward direction. Similarly, this conclusion is also true for the 70 °, 80 ° third baffles 804, i.e. the total resistance of the fluid flowing in forward and reverse directions through the 3 third baffles 804 is:
Fz3＜Ff3(2)
C) bluff body flow resistance analysis
The bluff body has smooth sphere and steep terminal surface, and the sphere is far less than the resistance of steep terminal surface to the fluid to the resistance of fluid, and it has obtained experimental verification as causing the valve to hinder the piece in the hemisphere lacks valve pump, so has:
Fz1＜Ff1(3)
summarizing the above analysis results, the total flow resistance for the fluid flowing in the forward direction through each of the choked flows is expressed as ∑ FziIndicating the total flow resistance in the reverse direction through each bluff body byfiAnd then:
∑Fzi＝Fza+Fzb+Fzc+Fz1+Fz3(4)
∑Ffi＝Ffa+Ffb+Ffc+Ff1+Ff3(5)
according to the expressions (1), (2) and (3), the expression (6) is established.
∑Ffi-∑Fzi＞0(6)
The equation (6) reveals that the flow resistance difference between the reverse direction and the forward direction is larger than zero when the fluid flows through the composite fluid resistor group 8 reversely and forwardly. The composite bluff body group 8 can be used as a valve structure, and can drive fluid to flow into and flow out of the pump cavity by matching with the periodic vibration of the piezoelectric vibrator, so that the corresponding valveless pump has the function of transmitting the fluid theoretically.
In FIG. 3, when the fluid flows out along the forward constricted flow channel, the flow is in a relatively stable laminar state; when the fluid flows out and flows into the outflow groove along the reverse expansion flow channel, turbulent flow can be generated, a large amount of vortexes can be generated, the mixing of different phases of liquid can be accelerated by the aid of the circuitous and flowing of the vortexes, and therefore the composite fluid blocking body group 8 can pump the fluid and can also achieve efficient mixing of the fluid.
As shown in fig. 5, the 1 st stirrer provided by the present invention includes a support shaft 101, a fixing bar 102, an insertion sleeve 103, a rotation sleeve 104, a stirring blade 105, and a retaining ring 106. The embedded sleeve 103 is embedded into the outlet 7, the embedded sleeve 103 and the outlet 7 are connected in a transition fit mode, and finally sealing glue can be applied to a matching surface for sealing; alternatively, the insert sleeve 103 may be externally threaded, and the outlet 7 may be internally threaded, with the threads being threadably engaged. The fixing bar 102 is fixed to an end surface wall surface of one end portion of the insertion sleeve 103 by a screw. The supporting shaft 101 is connected with the fixing strip 102 through threads, the rotating sleeve 104 is arranged on the supporting shaft 101, the stirring blades 105 are obliquely inserted into the rotating sleeve 104, the stirring blades 105 are symmetrically arranged along the circumferential direction, the number of the stirring blades 105 is 4, and the end part of the supporting shaft 101 is provided with the retaining ring 106. When the pump cavity is in the fluid discharging stage, liquid flows to the outlet 7, the liquid impacts the rotating sleeve 104 at the outlet 7, and the rotating sleeve 104 rotates and moves around the support shaft 101 to drive the stirring blades 105 on the rotating sleeve 104 to rotate and move, so that the liquid is mixed and stirred.
The invention also provides a stirrer of type 2, which is similar to the stirrer of type 1 in structure as shown in fig. 6, except that a rotating sleeve 104 and a group of stirring blades 105 are added. Every stirring vane 105 of group is along axial, circumference equipartition, changes cover 104 and drives stirring vane 105 axial displacement circumferential direction, and the quantity of first stirring vane 105 of group is established to 2, and the quantity of second stirring vane 105 of group can be established to 4.
The 2 nd stirrer differs from the 1 st stirrer in that: 1) the number of the stirring blades 105 of the stirrer of the type 2 is increased, and the stirring effect is better; 2) the number of the first group of blades of the stirrer of the type 2 is small, the stirrer is more sensitive to water flow fluctuation and water pressure, instantaneous rotation and movement are easy to generate, the second group of blades can be caused to rotate by vortexes generated by stirring the stirrer, the consumption of effluent water energy is reduced, and the pump flow is ensured; 3) the length of second blade is greater than first group, can deepen the vortex intensity who increases rivers, makes the mixture stir the effect better. The two stirrers disclosed by the invention are embedded into the outlet flow channel as a whole (in transition fit), so that the purposes of convenience in disassembly and assembly, easiness in replacement and optimization and innovation are realized.
The working principle of the piezoelectric pump is as follows: the piezoelectric vibrator performs reciprocating vibration with a certain frequency, which is raised upward and recessed downward, under the action of the driving voltage, as shown in fig. 8, that is, the suction and discharge processes of the fluid in the pump are realized, and the specific analysis is as follows:
(1) suction phase of fluid in pump cavity
When the vibrator vibrates upwards, the volume of the pump cavity is increased and the pressure is reduced, the pump starts to suck liquid, namely the liquid is sucked into the pump cavity in the forward direction and the reverse direction simultaneously, and the flowing direction of the liquid is shown in fig. 8 (a). Because the liquid sucked in the reverse direction is blocked and shielded by the flow blocking body 801, the first flow guiding plate 802, the second flow guiding plate 803 and the third flow guiding plate 804 layer by layer when flowing through the composite flow blocking body group 8, most of the liquid is accumulated in the concave area of the third flow guiding plate 804 to generate vortex, a small part of the liquid flows into the expanded conical surface through the channels c, b and a to generate vortex and turbulent flow, the flow resistance is large, the pressure loss of water flow is large, and the amount of the liquid sucked in the reverse direction is small; the liquid sucked in forward direction flows around the constriction region surrounded by the flow blocking body 801 and then along the first flow guiding plate 802, and the resistance of the liquid flowing out through the constriction tapered channels a, b and c is much smaller than that of the liquid flowing in reverse direction, namely, the forward flow can obtain higher net suction amount in the stage of liquid suction.
(2) Liquid discharge phase in pump chamber
When the vibrator vibrates downwards, the volume in the pump cavity is reduced, the pressure is increased, the pump starts to discharge liquid, namely, the liquid is simultaneously discharged out of the pump cavity in the forward direction and the reverse direction, and the liquid flowing direction is shown in fig. 8 (b). Since most of the liquid flowing in the reverse direction is blocked by the areas surrounded by the first flow guiding plate 802, the second flow guiding plate 803 and two sides of the pump cavity and takes a roundabout vortex flow state, the fluid flow resistance is large, only a small amount of liquid flows into the area of the inlet flow pipe through the flow channels c, b and a, and the very small amount of liquid can flow around the steep straight surface of the flow blocking body 801 and is discharged through the inlet flow pipe; the resistance of the forward flowing liquid flowing through the channels a, b and c is much smaller than the resistance of the reverse flowing liquid, so that the forward discharge can obtain a higher net discharge amount.
Therefore, in the vibration deformation of the vibrator in one period, the liquid sucked from the inlet is more, and the liquid sucked from the outlet is less; more liquid is discharged from the outlet, and less liquid is discharged from the inlet; the function of one-way pumping and transmitting fluid is realized macroscopically by matching with the periodic vibration of the vibrator.
Simulation analysis-mixed action analysis of the composite bluff body group 8 flow-winding field:
TABLE 1 geometric parameters of pumps for experiments
The model parameters of the simulation analysis are consistent with the parameters of the prototype pump (table 1), and a velocity trace and a pressure trace cloud chart in the Flow field of the bypass composite bluff body group 8 at the liquid suction stage are obtained by adopting Flow simulation analysis software, as shown in fig. 9. Observing the velocity trace and the pressure trace in fig. 9 reveals that: when liquid is sucked in the forward direction, the liquid circumfluence composite bluff body group 8 can generate small and uniform vortexes, the velocity trace and the pressure trace of the vortexes are uniformly distributed and are clear in layers, and the pressure loss is small and the flow resistance is small after the forward circumfluence composite bluff body group 8 is formed; when liquid is sucked reversely, small and uniform vortexes are formed in the area, close to the pump inlet, of the composite fluid blocking body group 8, and large or small vortex masses which are different in size and are stacked layer by layer are generated in the inner peripheral area of the pump cavity, which shows that when liquid is sucked reversely, the liquid is seriously hindered in circuitous flow direction, the flow speed is reduced, and meanwhile, the pressure loss is large and the flow resistance is large due to the formation of dense large and small vortex clusters.
Simulation analysis results further prove that the introduction of the composite bluff body group 8 causes small forward flow resistance and large reverse flow resistance, and the unequal forward and reverse resistance is the cause of the valve-induced pump; meanwhile, the process of forming the vortex type clusters with different sizes in the flow field also realizes the mixing process of different phase liquids, the liquid flows in a roundabout way along the vortex direction to achieve the vortex-induced mixing effect, and meanwhile, the process that large and small vortex masses are collected to each outlet to be discharged further accelerates the mixing among the fluids, so that the high-efficiency mixing and conveying of different phase liquids can be realized.
When the piezoelectric vibrator 2 vibrates upwards, the pump starts to suck liquid, the liquid is sucked into the pump cavity along the forward direction and the reverse direction simultaneously, the liquid flows through the inlet 9 and the flow blocking body 801 and sequentially flows through a flow channel formed by the first flow guiding plate 802, the second flow guiding plate 803 and the third flow guiding plate 804, the forward suction amount is large, and the reverse suction amount is small; at the exit, when being in the suction liquid stage in the pump chamber, there is palirrhea liquid flow direction export 7 department liquid impact change cover 104, change cover 104 centers on back shaft 101 rotates and removes, drives change cover 104 is last stirring vane 105 rotates and removes, realizes the mixed stirring effect to liquid, simultaneously, also plays the effect of consuming palirrhea liquid pressure differential ability, restraines the backward flow.
When the piezoelectric vibrator 2 vibrates downwards, the pump starts to discharge liquid, the liquid is simultaneously discharged out of the pump cavity in the forward direction and the reverse direction, and the liquid flowing in the reverse direction has a very small amount of liquid which can bypass the steep straight surface of the resistor 801 and be discharged through the inlet flow pipe; the forward flowing liquid flows through the flow channel formed by the first flow guide plate 802, the second flow guide plate 803 and the third flow guide plate 804, and the net discharge amount is higher. At the outlet, when the pump cavity is in the fluid discharging stage, liquid flows to the outlet 7, the liquid impacts the rotating sleeve 104 at the outlet 7, and the rotating sleeve 104 rotates and moves around the supporting shaft 101 to drive the stirring blades 105 on the rotating sleeve 104 to rotate and move, so that the liquid is mixed and stirred.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a mix stirring pumping integrated form valveless piezoelectric pump which characterized in that: the pump comprises a pump cover, a pump body, a piezoelectric vibrator and a pump seat, wherein the piezoelectric vibrator, the pump body and the pump seat are sequentially connected to enclose a pump cavity, the pump body is provided with an inlet and an outlet, and the pump seat is provided with a composite bluff body group; the composite baffle body group is arranged between the outlet and the inlet and comprises a baffle body, two first baffle plates, two second baffle plates and a plurality of third baffle plates, wherein the end face of the baffle body facing the inlet is a spherical surface, the end face of the baffle body facing the outlet is a plane, the two first baffle plates are oppositely arranged, the two second baffle plates are oppositely arranged, the third baffle plates are in a V-shaped structure, and the tip of each third baffle plate faces the inlet; the first guide plates and the second guide plates are sequentially arranged along the direction from the inlet to the outlet, the distance between the two first guide plates is gradually reduced, the distance between the two second guide plates is gradually reduced, the end parts, close to the first guide plates, of the second guide plates are further provided with bending parts bent towards the direction of the first guide plates, the flow blocking bodies are located between the two first guide plates, and the third guide plates are located between the two second guide plates.
2. The hybrid, agitation and pumping integrated valveless piezoelectric pump according to claim 1, wherein: the third guide plate is also arranged between the two first guide plates.
3. The hybrid, agitation, pumping, integrated valveless piezoelectric pump of claim 2, wherein: the pump body is provided with a plurality of inlets, and the inlets are distributed in an area formed between extension lines of the two first guide plates.
4. The hybrid, agitation and pumping integrated valveless piezoelectric pump according to claim 3, wherein: the first guide plate is close to one side of the inlet, and the second guide plate is positioned on the outer side of the first guide plate on the corresponding side.
5. The hybrid, agitation and pumping integrated valveless piezoelectric pump according to claim 4, wherein: the first guide plate and the second guide plate respectively enclose two groups of conical areas which symmetrically shrink along the spherical center line, and the first guide plate and the third guide plate as well as the second guide plate and the third guide plate respectively form two groups of conical channels which are symmetrically distributed along the spherical center line.
6. The hybrid, agitation and pumping integrated valveless piezoelectric pump according to claim 5, wherein: the spherical surface of the flow blocking body is opposite to and obliquely opposite to the inlet, and the opening direction of the third flow guide plate is opposite to and obliquely opposite to the outlet.
7. The hybrid, agitation and pumping integrated valveless piezoelectric pump according to claim 1, wherein: the pump seat is provided with a fixed frame, and the flow blocking body, the first flow guide plate, the second flow guide plate and the third flow guide plate are all inserted into a groove formed in the fixed frame.
8. The hybrid, agitation and pumping integrated valveless piezoelectric pump according to claim 1, wherein: the outlet is also provided with a stirrer; the agitator includes back shaft, fixed strip, embedding cover, commentaries on classics cover and stirring vane, the embedding cover is embedded in the export, the fixed strip is fixed to the one end of embedding cover, the back shaft with the fixed strip is connected, the rotatable setting of commentaries on classics cover is in on the back shaft, be provided with on the commentaries on classics cover stirring vane.
9. The hybrid, agitation, pumping, integrated valveless piezoelectric pump of claim 8, wherein: the stirring blade is arranged obliquely with respect to the axis of the support shaft.
10. The hybrid, agitation, pumping, integrated valveless piezoelectric pump of claim 8, wherein: the stirring blades are arranged perpendicular to the axis of the supporting shaft.
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| CN113137363A (en) * | 2021-04-26 | 2021-07-20 | 长春工业大学 | Valveless double-cavity resonance piezoelectric drive type insulin pump |
| CN115111143A (en) * | 2022-06-28 | 2022-09-27 | 桂林理工大学 | Inward inclination arrow bluff body cambered surface cavity valveless piezoelectric pump |
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| CN115111143B (en) * | 2022-06-28 | 2023-11-17 | 桂林理工大学 | Valve-free piezoelectric pump with inner dip arrow-shaped fluid-blocking cambered surface cavity |
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