CN100357592C - Combination pump of piezoelectric ceramics - Google Patents
Combination pump of piezoelectric ceramics Download PDFInfo
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- CN100357592C CN100357592C CNB2004100045403A CN200410004540A CN100357592C CN 100357592 C CN100357592 C CN 100357592C CN B2004100045403 A CNB2004100045403 A CN B2004100045403A CN 200410004540 A CN200410004540 A CN 200410004540A CN 100357592 C CN100357592 C CN 100357592C
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- plunger
- piezoelectric constant
- pump
- hole
- oil
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Abstract
The present invention relates to an improvement of a variable pump of piezoelectric ceramic, which belongs to the manufacturing technology of a micro pump, the improvement of a variable pump of piezoelectric ceramic comprises the plunger pumps of the piezoelectric ceramic, and each plunger pump of the piezoelectric ceramic is composed of a regulating screw 1, a plunger sleeve 2, a piezoelectric ceramic stack 3, a sealing ring 4, a plunger 5, a return spring 6 and an end cover 7. The improvement of a variable pump of piezoelectric ceramic is characterized in that a pump body is at least provided with a pair of the plunger pumps of the piezoelectric ceramic with the same structures to form a combination pump of the piezoelectric ceramic, a center hole 10 of the first plunger pump of the piezoelectric ceramic is communicated with a series connection hole 11 of the second plunger pump of the piezoelectric ceramic, and the center hole 10 of the second plunger pump of the piezoelectric ceramic is communicated with the series connection hole 11 on the first plunger pump of the piezoelectric ceramic. The improvement of a variable pump of piezoelectric ceramic causes the flow of the plunger pumps of the piezoelectric ceramic to be continuous and have no pulsation and simultaneously enhances the vibration frequency of the piezoelectric ceramic stack.
Description
Technical field
The invention belongs to the micro pump manufacturing technology, relate to improvement the piezoelectric constant variable displacement pump.It is mainly used in requiring pumping source not have flow pulsation, and in the continuous application.
Background technique
At present, axial piston pump is with its compact structure, and radial dimension is little, and rotary inertia is little, the rotating speed height, and be easy to characteristics such as variable, be widely used in multiple fields such as engineering machinery, lifting transportation, metallurgy, Aero-Space, boats and ships.But the flow pulsation that it is intrinsic, having limited it needs pressure pulsation little at some, the application in the micro-precision displacement occasion.Along with the development based on the driver of piezoceramic material, the piezoelectric ceramic pump that is directly driven by the driver based on piezoceramic material just arises at the historic moment.But existing piezoelectric ceramic pump, flow is discontinuous, and generally adopts one-way valve to control fluid flow direction, causes complex structure, and frequency of okperation is low.For example Fig. 1 provides a kind of piezoelectric ceramic pump schematic diagram.Its working principle is: when the bi-bit bi-pass selector valve of piezoelectric ceramic pump both sides all was in on-state, one-way valve to the equipment fuel feeding, was realized big travel displacement and preload by low pressure pump by bypass; When two position two-way valve was in cut-off state, piezoelectric ceramic pump can enter working state, provided displacement in a small amount and thick the loading to equipment; When the load that is applied during, can realize microdisplacement and accurate the loading by the precision of electric field strength is controlled near desired value; When the left side selector valve is connected, when the right side selector valve ends, can realize accurate unloading by precision control to electric field strength.Can find out that by schematic diagram two one-way valves are wherein arranged.(referring to " Study of Piezoelectric Ceramic Pump ", " lathe and hydraulic pressure ", the first phase in 2003,147-148 page or leaf.)
Summary of the invention
The objective of the invention is: provide a kind of simple in structure, the continuous and pulseless piezoelectric constant variable displacement pump of flow.
Technological scheme of the present invention is: a kind of piezoelectric constant unipump, comprise adjusting screw 1, plunger bushing 2, piezoelectric constant heap 3, plunger 5, Returnning spring 6, end cap 7, plunger bushing 2 is cylindrical bodys that have through-lumen, adjusting screw 1 is connected with an end of plunger bushing 2 by screw thread, end cap 7 is with the other end sealing of plunger bushing 2, the inner chamber of plunger bushing 2 is divided into two sections, one section near adjusting screw 1 is PZT cavity, one section near end cap 7 is plunger cavity, plunger 5 is positioned at plunger cavity, it is characterized in that
(1) circular groove is arranged on plunger 5, between circular groove and plunger 5 ear end faces, seal ring 4 is arranged, on the sidewall of the plunger cavity section of plunger bushing 2, oil drainage hole 8 and oil-sucking hole 9 are arranged, oil drainage hole 8 and oil-sucking hole 9 are symmetrically distributed in the circular groove both sides, piezoelectric constant heap 3 is positioned at PZT cavity, and its front-end face withstands the ear end face of plunger 5, and its ear end face withstands adjusting screw 1, Returnning spring 6 is between end cap 7 and plunger 5
(2) pump housing is arranged, the identical piezoelectric constant plunger pump of a pair of structure is installed on the pump housing at least, form the piezoelectric constant unipump, inlet port and oil drain out are arranged on the pump housing, the oil-sucking hole 9 of all piezoelectric constant plunger pumps is communicated with pump housing inlet port by the inner gateway on the pump housing, and the oil drainage hole 8 of all piezoelectric constant plunger pumps is communicated with pump housing oil drain out by the inner gateway on the pump housing;
(3) a series connection hole 11 is arranged on the plunger bushing 2 of each piezoelectric constant plunger pump, it is between oil-sucking hole 9 and oil drainage hole 8, corresponding with the circular groove on the plunger 5, a center hole 10 is arranged on end cap 7, center hole 10 on the first piezoelectric constant plunger pump is communicated with by the hole 11 of connecting on the inner gateway on the pump housing and the second piezoelectric constant plunger pump, and the center hole 10 on the second piezoelectric constant plunger pump is by hole 11 connections of connecting on the inner gateway on the pump housing and the first piezoelectric constant plunger pump.
Advantage of the present invention is: the present invention has overcome the discontinuity of single plunger piezoelectric constant pump duty, and there is not flow pulsation, and the break-make that oil suction and oil extraction by plunger directly realize oil-sucking hole and oil drainage hole, avoided adopting that one-way valve brought makes complex structure and can not use at high frequency, improved the vibration frequency of piezoelectric constant heap.
Description of drawings
Fig. 1 is existing a kind of piezoelectric ceramic pump schematic diagram.
Fig. 2 is a structural representation of the present invention.
Fig. 3 is Piezoelectric Ceramic voltage and corresponding output flow curve synoptic diagram.
Embodiment
Below the present invention is described in further details.Referring to Fig. 2, piezoelectric constant unipump of the present invention adopts two plunger piezoelectric ceramic pumps of symmetric arrangement to form unipump.It comprises the piezoelectric constant plunger pump that is made of adjusting screw 1, plunger bushing 2, piezoelectric constant heap 3, seal ring 4, plunger 5, Returnning spring 6, end cap 7, plunger bushing 2 is cylindrical bodys that have through-lumen, adjusting screw 1 is connected with an end of plunger bushing 2 by screw thread, and end cap 7 is with the other end sealing of plunger bushing 2.The inner chamber of plunger bushing 2 is divided into two sections, and one section of close adjusting screw 1 is PZT cavity, and one section of close end cap 7 is plunger cavity.Plunger 5 is positioned at plunger cavity, it is characterized in that,
(1) circular groove is arranged on plunger 5.Guarantee reliable sealing by Spielpassung between plunger 5 and plunger bushing 2 inner chambers.So-called fore-and-aft direction by as give a definition: a side of end cap 7 is the place ahead of pump, and adjusting screw 1 one sides are the rear.Between circular groove and plunger 5 ear end faces, seal ring 4 is arranged.On the sidewall of the plunger cavity section of plunger bushing 2 oil drainage hole 8 and oil-sucking hole 9 are arranged, oil drainage hole 8 and oil-sucking hole 9 are symmetrically distributed in the circular groove both sides, and when plunger 5 mediated, oil-sucking hole 9 and oil drainage hole 8 all were not communicated with on the circular groove on it and the plunger bushing 2.Piezoelectric constant heap 3 is positioned at PZT cavity, and its front-end face withstands the ear end face of plunger 5, and its ear end face withstands adjusting screw 1.Returnning spring 6 is between end cap 7 and plunger 5.
(2) pump housing is arranged, the identical piezoelectric constant plunger pump of a pair of structure is installed on the pump housing at least, form the piezoelectric constant unipump.Inlet port and oil drain out are arranged on the pump housing, and the oil-sucking hole 9 of all piezoelectric constant plunger pumps is communicated with pump housing inlet port by the inner gateway on the pump housing, and the oil drainage hole 8 of all piezoelectric constant plunger pumps is communicated with pump housing oil drain out by the inner gateway on the pump housing.
(3) a series connection hole 11 is arranged on the plunger bushing 2 of each piezoelectric constant plunger pump, it is between oil-sucking hole 9 and oil drainage hole 8, be connected with circular groove, a center hole 10 is arranged on end cap 7, center hole 10 on the first piezoelectric constant plunger pump is communicated with by the hole 11 of connecting on the inner gateway on the pump housing and the second piezoelectric constant plunger pump, and the center hole 10 on the second piezoelectric constant plunger pump is by hole 11 connections of connecting on the inner gateway on the pump housing and the first piezoelectric constant plunger pump.Here first and second are convenience in order to narrate, the plunger pump on the left side or the right can be as the first piezoelectric constant plunger pump among Fig. 2, the piezoelectric constant plunger pump on this paper regulation left side is the first piezoelectric constant plunger pump, and then the right is the second piezoelectric constant plunger pump.
In order to shorten the length of plunger pump, a blind hole is arranged on the ear end face of plunger 5, the front end of piezoelectric constant heap 3 inserts in this blind hole, and its front-end face withstands the interior edge face of blind hole.
Working principle of the present invention is: when applying the bias voltage of 1/2 operating voltage for the piezoelectric constant unipump, when plunger 5 mediates, the hole 11 of connecting on circular groove on it and the plunger bushing 2 is communicated with, and is not communicated with oil-sucking hole 9 and oil drainage hole 8 on the plunger bushing 2.Two piezoelectric constant plunger pumps apply the driving voltage of pyramidal wave and just in time 90 ° of phase phase differences simultaneously, as shown in Figure 3.At 0～T/4 in the cycle, the piezoelectric constant heap 3 of the first piezoelectric constant plunger pump shortens, under Returnning spring 6 effects, plunger 5 is moved to the left and carries out oil suction, and the oil drain out on the pump housing is connected with the center hole 10 of the second piezoelectric constant plunger pump by the oil drainage hole on the plunger bushing 28, circular groove and series connection hole 11, form an oil outlet passage, guaranteed that the second piezoelectric constant plunger pump can oil extraction; The piezoelectric constant of second piezoelectric constant plunger pump heap 3 elongations simultaneously, promotion plunger 5 is moved to the left and carries out oil extraction, and the inlet port on the pump housing is communicated with the center hole 10 of the first piezoelectric constant plunger pump by oil-sucking hole 9, the circular groove on the plunger 5 and the series connection hole 11 on the plunger bushing 2 on the plunger bushing 2, form an oil suction path, guaranteed the oil suction of the first piezoelectric constant plunger pump; And the circular groove on the first piezoelectric constant pump plunger 5 cuts out with oil drainage hole 8 gradually, the circular groove on the second piezoelectric constant pump plunger 5 gradually with oil-sucking hole 9 standard-sized sheets.During the cycle, the circular groove on the first piezoelectric constant pump plunger 5 returns back to meta at T/4, all closes circular groove on the second piezoelectric constant pump plunger 5 and oil-sucking hole 9 standard-sized sheets with oil drainage hole 8 and oil-sucking hole 9.At T/4～T/2 in the cycle, the piezoelectric constant heap 3 of the first piezoelectric constant plunger pump continues to shorten, under Returnning spring 6 effects, plunger 5 continues the mobile oil suction of carrying out left, and the inlet port on the pump housing is connected with the center hole 10 of the second piezoelectric constant plunger pump by the oil-sucking hole on the plunger bushing 29, circular groove and series connection hole 11, form an oil suction path, guaranteed that the second piezoelectric constant plunger pump can oil suction; The piezoelectric constant of second piezoelectric constant plunger pump heap 3 shortens simultaneously, under Returnning spring 6 effects, plunger 5 moves right and carries out oil suction, and the inlet port on the pump housing is communicated with the center hole 10 of the first piezoelectric constant plunger pump by oil-sucking hole 9, the circular groove on the plunger 5 and the series connection hole 11 on the plunger bushing 2 on the plunger bushing 2, form an oil suction path, guaranteed the continuation oil suction of the first piezoelectric constant plunger pump; And, the circular groove on the first piezoelectric constant pump plunger 5 gradually with oil-sucking hole 9 standard-sized sheets, the circular groove on the second piezoelectric constant pump plunger 5 cuts out gradually with oil-sucking hole 9 gradually.At T/2 during the cycle, circular groove on the first piezoelectric constant pump plunger 5 and oil-sucking hole 9 standard-sized sheets, the circular groove on the second piezoelectric constant pump plunger 5 returns back to meta, all closes with oil drainage hole 8 and oil-sucking hole 9.Situation in other cycle is similar.Like this, under the driving voltage effect, add driving voltage shown in Figure 3, just can realize the continuous oil suction and the oil extraction of piezoelectric constant unipump by piezoelectric constant heap to two ends, the left and right sides.
Single right flow curve as shown in Figure 3.Pulse continuously and not for the flow that makes pump, 2 pairs of piezoelectric constant plunger pumps are installed on the pump housing.If adopt two pairs, and second pair driving voltage amplitude is identical with first pair driving voltage, phase place than first pair respectively lag behind 180 °, then flow curve is a continuous and straight line parallel with coordinate axes.Like this, the flow of pump is pulsed continuously and not.The amplitude or the frequency of the triangle wave voltage above being applied to every pair by adjusting can also be regulated the output flow of pump.
Claims (3)
1, a kind of piezoelectric constant unipump, comprise adjusting screw [1], plunger bushing [2], piezoelectric constant heap [3], plunger [5], Returnning spring [6], end cap [7], plunger bushing [2] is a cylindrical body that has through-lumen, adjusting screw [1] is connected by the end of screw thread with plunger bushing [2], end cap [7] is with the other end sealing of plunger bushing [2], the inner chamber of plunger bushing [2] is divided into two sections, one section near adjusting screw [1] is PZT cavity, one section near end cap [7] is plunger cavity, plunger [5] is positioned at plunger cavity, it is characterized in that
(1) circular groove is arranged on plunger [5], between circular groove and plunger [5] ear end face, seal ring [4] is arranged, on the sidewall of the plunger cavity section of plunger bushing [2], oil drainage hole [8] and oil-sucking hole [9] are arranged, oil drainage hole [8] and oil-sucking hole [9] are symmetrically distributed in the circular groove both sides, piezoelectric constant heap [3] is positioned at PZT cavity, and its front-end face withstands the ear end face of plunger [5], and its ear end face withstands adjusting screw [1], Returnning spring [6] is positioned between end cap [7] and the plunger [5]
(2) pump housing is arranged, the identical piezoelectric constant plunger pump of a pair of structure is installed on the pump housing at least, form the piezoelectric constant unipump, inlet port and oil drain out are arranged on the pump housing, the oil-sucking hole of all piezoelectric constant plunger pumps [9] is communicated with pump housing inlet port by the inner gateway on the pump housing, and the oil drainage hole of all piezoelectric constant plunger pumps [8] is communicated with pump housing oil drain out by the inner gateway on the pump housing;
(3) a series connection hole [11] is arranged on the plunger bushing [2] of each piezoelectric constant plunger pump, it is positioned between oil-sucking hole [9] and the oil drainage hole [8], corresponding with the circular groove on the plunger [5], a center hole [10] is arranged on end cap [7], center hole [10] on the first piezoelectric constant plunger pump is communicated with by the hole of connecting [11] on the inner gateway on the pump housing and the second piezoelectric constant plunger pump, and the center hole [10] on the second piezoelectric constant plunger pump is by the hole of connecting [11] connection on the inner gateway on the pump housing and the first piezoelectric constant plunger pump.
2, piezoelectric constant unipump according to claim 1 is characterized in that, a blind hole is arranged on the ear end face of plunger [5], and the front end of piezoelectric constant heap [3] inserts in this blind hole, and its front-end face withstands the interior edge face of blind hole.
3, piezoelectric constant unipump according to claim 1 and 2 is characterized in that, 2 pairs of piezoelectric constant plunger pumps are installed on the pump housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100045403A CN100357592C (en) | 2004-02-23 | 2004-02-23 | Combination pump of piezoelectric ceramics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100045403A CN100357592C (en) | 2004-02-23 | 2004-02-23 | Combination pump of piezoelectric ceramics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1661232A CN1661232A (en) | 2005-08-31 |
| CN100357592C true CN100357592C (en) | 2007-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100045403A Expired - Fee Related CN100357592C (en) | 2004-02-23 | 2004-02-23 | Combination pump of piezoelectric ceramics |
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| Country | Link |
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| CN (1) | CN100357592C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100374724C (en) * | 2006-06-01 | 2008-03-12 | 北京工业大学 | Piezoelectric screw pump |
| CN112081723B (en) * | 2020-08-18 | 2021-12-14 | 华南农业大学 | Piezoelectric pump based on resonance differential displacement amplification |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2242736Y (en) * | 1996-03-29 | 1996-12-18 | 无锡市高压清洗设备厂 | High-pressure cleaning machine |
| CN2319436Y (en) * | 1998-02-17 | 1999-05-19 | 牡丹江铁路分局林口液压起拨道机厂 | Load variable portable trackshifter |
| CN2361872Y (en) * | 1998-12-30 | 2000-02-02 | 童辉 | Hand plunger pump |
| CN2416246Y (en) * | 2000-04-13 | 2001-01-24 | 刘英乾 | Double-plunger pump |
-
2004
- 2004-02-23 CN CNB2004100045403A patent/CN100357592C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2242736Y (en) * | 1996-03-29 | 1996-12-18 | 无锡市高压清洗设备厂 | High-pressure cleaning machine |
| CN2319436Y (en) * | 1998-02-17 | 1999-05-19 | 牡丹江铁路分局林口液压起拨道机厂 | Load variable portable trackshifter |
| CN2361872Y (en) * | 1998-12-30 | 2000-02-02 | 童辉 | Hand plunger pump |
| CN2416246Y (en) * | 2000-04-13 | 2001-01-24 | 刘英乾 | Double-plunger pump |
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| Publication number | Publication date |
|---|---|
| CN1661232A (en) | 2005-08-31 |
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Granted publication date: 20071226 Termination date: 20100223 |