CN202280601U - Small flow pump driven by electrically-actuated artificial muscle actuator - Google Patents

Abstract

A small flow pump driven by an electrically-actuated artificial muscle actuator comprises a flexible pump cavity, the artificial muscle actuator, an inlet one-way valve, an outlet one-way valve, a sliding assembly, a cover plate assembly, a driving controller and the like. The small flow pump driven by the electrically-actuated artificial muscle actuator is characterized in that the left end of the pump cavity is fixed, the right end of the pump cavity is connected with the sliding assembly, the artificial muscle actuator is connected with the pump cavity, the inlet one-way valve is connected with a left cover plate, the outlet one-way valve is connected with a right end cover, and the flexible pump cavity is installed in a hard casing manufactured by the cover plate assembly in a sealing mode. When the pump works, the electrical actuating bending effect of ionic polymer-metal composite (IPMC) serving as the artificial muscle is utilized to manipulate the flexible pump cavity to do periodic contraction and expansion movements in order to change volume of the pump cavity and achieve pumping of fluid. The small flow pump driven by the electrically-actuated artificial muscle actuator has the advantages that (1) the prime mover removal of pump drive is achieved; (2) a complex actuating mechanism required by a traditional pump is abandoned, and the structure of the pump is simplified; (3) an actuating part of the pump is not contacted with the fluid so that pollution caused by the actuating part to the fluid is avoided; and (4) the pump can be driven by low voltage and used for precise flow control.

Description

The low-capacity pump that a kind of electric actuation artificial-muscle actuator drives

Technical field

The utility model relates to a kind of medical usage fluid delivery system, relates in particular to a kind of electricity of electric actuation artificial-muscle that utilizes and causes curvature effect, realizes the low-capacity pump of fluid pump function.

Background technique

The medical fluid delivery device is one type of important medical apparatus; The very important effect of performance in medical procedure and operation; For example, in celioscopy and endoscopy, just need to adopt fluid pump to carry medicine to the affected part; In haemodialysis or openheart surgery, also need utilize pump to hemo system or heart-lung machine pumping blood.At present, most medical pumps all adopt positive-displacement pump and centrifugal pump.

Characteristics such as usually, positive-displacement pump is to utilize parts such as gear, spiral, roller that fluid is sucked pump chamber from sucking end, fluid is failed causing exhaust end again, has stability of flow, and suction force is strong, and pressure head is stable and simple in structure.Centrifugal pump is then through the rotation of pump shaft impeller; Order about fluid is got rid of to impeller outlet at centrifugal action lower blade runner;, spiral case sends into discharge tube after collecting again; It has, and space hold is little, noise is little, cost is low and the pulsating movement free phenomenon, but the suction force of centrifugal pump is lower, head is little and frictional loss is bigger.Positive-displacement pump and iron pump have multiple patterns such as gear pump, peristaltic pump, reciprocating pump, radial impeller pump, axial-flow pump.

Existing positive-displacement pump and centrifugal pump technology are ripe just day by day, and they are bringing into play very important effect in each field such as production, life.But however, these pumps also come with some shortcomings, such as, in their pump chamber, need be provided with one usually than the greater trochanter system, thereby make pump structure become very complicated.Particularly, rotor-support-foundation system also directly contacts (like wing pump, gear pump) usually with fluid, and this has just increased the contaminated possibility of fluid greatly, and has restricted its application at medical domain.Under this condition, constantly release the pattern that brand-new pumping technology and device solve this problem and full stream of fluid pump, just become is necessary very much.

As everyone knows; Electroactive polymer (EAP) claim the electric actuation artificial-muscle again; Being one type induces following in external electric field; Can produce bending through changing its internal structure, stretch, tighten or the high molecular polymer of multiple mechanical behavior such as distortion, its electricity amount of causing is big, response is fast, mechanical-electric coupling efficient is high.In various EAP; The most representative is the synthetic (IPMC) of metal and Ionomer; The electric actuation strain effect of this EAP is to be based upon on the basis of its internally charged hydrated cation diffusion motion, and it does the time spent in low voltage (less than 10V), can produce obvious bending.Utilize this electricity of IPMC to cause curvature effect, can realize many dynamo-electric functions, the pumping installations that the utility model is released just is being based on the IPMC artificial-muscle.

Summary of the invention

The purpose of the utility model is to provide a kind of low-capacity pump of electric actuation artificial-muscle actuator driving; It utilizes the electricity of artificial-muscle actuator to cause the flexural strain effect; Realize the fluid pumping, that this device has is simple in structure, stable performance, pumping efficiency are high, can realize advantage such as the accurate control of fluid.

The utility model is achieved in that it comprises pump chamber, artificial-muscle actuator, inlet one-way valve, outlet one-way valve, sliding assembly, upper cover plate, base plate, front shroud, back shroud, left cover, right cover plate, drive controller and slip ring.It is characterized in that: the left end of pump chamber connects left cover, and the right-hand member of pump chamber connects sliding assembly, and the artificial-muscle actuator connects pump chamber; Inlet one-way valve connects left cover; The outlet one-way valve connects right cover plate, and upper cover plate connects left cover, left cover connects base plate, and front shroud connects base plate, back shroud connects base plate; Right cover plate connects base plate; Drive controller connects the artificial-muscle actuator through lead, and slip ring is connected the delivery side of pump place, and it is through feeding the low-frequency alternating voltage signal on artificial-muscle; Excitation IPMC electric actuation artificial-muscle produces flexure vibrations and also drives the pump chamber film and produce mechanically deformation, thereby changes the volume of pump chamber and realize the suction and the pumping of fluid.

The technique effect of the utility model is: the required electricity-function conversion of the running of 1 pump is accomplished through artificial-muscle, therefore, need not to be pump configuration motor or internal combustion engine prime movers; 2 pumps are operated elasticity pump chamber film through the artificial-muscle actuator and are changed the pump chamber volume, can save traditional mechanical pump required complicated machinery transmission and actuator like this, simplify pump structure widely; 3 because the motion actuator (artificial-muscle) of pump does not contact with fluid, and therefore this pump can be avoided the pollution problem of actuator convection cell; 4 because the driving voltage of IPMC artificial-muscle is lower, so this pump can be realized low voltage drive; 5 owing to regulate the amplitude be applied to the energizing voltage on the IPMC, just can change the amplitude of variation of pump chamber, and the driver frequency of change artificial-muscle just can change rate of pumping, and this just makes this pump have accurate metering characteristics.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the A-A generalized section of the utility model structure.

Fig. 3 is the B-B generalized section of the utility model structure.

Fig. 4 is that the pump of the utility model is inhaled principle.

Fig. 5 is the pump row principle of the utility model.

In the drawings: 1; Pump chamber 2; Artificial-muscle actuator 3; Inlet one-way valve 4; Outlet one-way valve 5; Sliding assembly 6; Upper cover plate 7; Base plate 8; Front shroud 9; Back shroud 10; Left cover 11; Right cover plate 12; Drive controller 13; Slip ring 14; Elastic membrane 21; Artificial-muscle actuator assembly 22; Artificial-muscle actuator assembly 23; Artificial-muscle actuator assembly 24; Artificial-muscle actuator assembly 25; Artificial-muscle actuator assembly 26; Artificial-muscle actuator assembly.

Embodiment

Below in conjunction with accompanying drawing, specify the electric actuation curvature effect that the utility model utilizes the IPMC artificial-muscle, realize the method for fluid pumping and the mode of execution of this corresponding fluid pump.

Like Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5; The utility model mainly by pump chamber 1, artificial-muscle actuator 2, inlet one-way valve 3, outlet one-way valve 4, sliding assembly 5, upper cover plate 6, form by base plate 7, front shroud 8, back shroud 9, left cover 10, right cover plate 11, drive controller 12, slip ring 13 and elastic membrane.Pump chamber 1 is put together by the elastic membrane 14 of two thinner thicknesses.Before pump is started working, pump chamber 1 roughly be the cylindroid structure, when pump turns round, the shape of pump chamber 1 and the variation of volume generating period property.The utility model provides the pump chamber structure a kind of reference figuration.Can pump chamber be designed to other shape such as cylindric, square frame shape fully according to the needs of using.If the pump chamber alteration of form, corresponding change also should take place in the configuration mode of artificial-muscle actuator thereupon on the pump chamber.

When this pump work, need on the IPMC artificial-muscle actuator that is pasted on the pump chamber, to apply constant amplitude, with alternating voltage excitation pulse frequently, produce the flexural strain vibration to excite the artificial-muscle actuator.The utility model is just through being that this vibrates contraction or the expansion of controlling pump chamber, thereby the volume that changes pump chamber is to reach the purpose of pumping fluid.

In the pump structure that the utility model is released; Pump chamber is encapsulated in by upper cover plate 6; In the enclosed construction that base plate 7, front shroud 8, back shroud 9, left cover 10, right cover plate 11 are formed; This mainly is to consider that pump chamber 1 is to be put together by flexible membrane, and the thickness of film is less, therefore needs a hard coat that it is protected.

Shrink and the required enough power of extensional motion for pump chamber is produced, on pump chamber, dispose the IPMC artificial-muscle actuator 2 of some.In theory, the actuator quantity that disposes many more, the power of pump is big more.And,, should dispose big thickness artificial-muscle actuator or IPMC artificial-muscle actuator lamination as far as possible in order to increase the suction capactity of pump.

For making pump chamber produce required contraction of its work and extensional motion; Must dispose the holding position of artificial-muscle actuator by mode shown in the accompanying drawing 4; Promptly for artificial-muscle assembly 21 and artificial-muscle assembly 24; Its left end of clamping should be distinguished,, its right-hand member of clamping should be distinguished for artificial-muscle assembly 23 and artificial-muscle assembly 26.To artificial-muscle assembly 22 and artificial-muscle assembly 24, then need clamping or solidify the position, intermediate portion.

Solidify the lose flexibility problem for fear of pump chamber flexible membrane and artificial-muscle actuator because of viscose glue,, need artificial-muscle actuator 2 to be sticked on the surface of pump chamber film with soft glue in order to prevent the decline of artificial-muscle electric actuation effect.

Accompanying drawing 4 has provided the utility model " pump suction " principle based on the pump of IPMC artificial-muscle.Visible from figure, when pump will suck fluid from hold chute, the spool of inlet one-way valve 3 need move right and the inflow port of pump is opened, and simultaneously, the spool that exports low pressure check valve 4 also should move to right and pump gone out the head piece shutoff; Then, drive controller 12 is to artificial-muscle assembly 21, and artificial-muscle assembly 23 feeds forward voltage with artificial-muscle assembly 25, and simultaneously to artificial-muscle assembly 22, artificial-muscle assembly 24 feeds backward voltage with artificial-muscle assembly 26.Two produce bending deflection shown in accompanying drawing 4 to each artificial-muscle actuator of polar voltages excitation, order about two pump chamber films and expand outwardly, and cause pump chamber to increase and in pump chamber, form certain vacuum.This pump utilizes this degree of vacuum that fluid is sucked pump chamber exactly.

Accompanying drawing 5 has provided " pump row " principle of the pump of the utility model.Visible among the figure, when will be with the fluid in the pump chamber when going out head piece and discharge, the spool of the inlet one-way valve 3 of pump moves to left and its inflow port is closed, and the spool of outlet one-way valve 4 also moves to left and the head piece that goes out of pump is opened; Meanwhile, drive controller 12 is to artificial-muscle assembly 21, and artificial-muscle assembly 23 feeds backward voltage with artificial-muscle assembly 25, and to artificial-muscle assembly 22, artificial-muscle assembly 24 feeds forward voltage with artificial-muscle assembly 26.Two to bending deflection shown in each artificial-muscle actuator generation accompanying drawing 2 of polar voltages excitation, orders about two pump chamber elastic membranes and inwardly bounce back, and causes the volume of pump chamber to diminish, thereby in pump chamber, form certain hydrodynamic pressure.This pump is exactly to utilize this pressure to force fluid outwards to discharge from the head piece that goes out of pump.

The action of the every completion of pump chamber one " pump suction " and " pump row " has just realized a pumping circulation of fluid.The utility model through constantly repeating above-mentioned pumping circulation, is realized the uninterrupted pumping of fluid exactly.

Shown in accompanying drawing 4, the machinery resistance retardance when shrinking and expanding in order to reduce pump chamber, the utility model is fixed the left end of pump chamber, and its right-hand member is configured to move freely end.When pump chamber shrank and expand, linear reciprocating motion was correspondingly done in the pump chamber mobile terminal.

Inlet one-way valve 3 both can adopt the spring control mode with outlet one-way valve 4 spools, also can adopt electromagnetism to control formula.As controlling formula for spring, then should adopt micro-force spring, be beneficial to opening and closing of valve.As adopt electromagnetism to control formula; Then the frequency of controlling of valve must be frequently same with the artificial-muscle energizing voltage; And act on the inlet one-way valve 3 control signal must with the excitation pulse homophase on the artificial-muscle assembly 21, act on outlet on the one-way valve 4 control signal must with excitation pulse anti-phase on the artificial-muscle assembly 21.Preferably adopt electromagnetism to control formula.

For pumping capacity that guarantees pump and the life-span that prolongs pump, pump chamber film 11 must possess higher elasticity and enough intensity, for this reason, should adopt the rubber membrane material to process pump chamber, and the thickness of film should be controlled at 0.2 ~ 0.3 mm.

The effect of drive controller 12 is to IPMC artificial-muscle actuator 2 energizing voltage and control signal to be provided.In order to improve the mechanical-electric coupling efficient of artificial-muscle actuator 2; Drive controller 12 preferably can provide the bipolar square wave excitation pulse to artificial-muscle actuator 2; The amplitude of this signal should be adjustable continuously in 1 ~ 10V scope, and frequency should be adjustable continuously in 0.1 ~ 10Hz.

The utility model is realized the fluid pumping through the significantly mechanical contraction of pump chamber with expansion, will cause delivery side of pump place flow pulsation to a certain degree to occur.Be head it off, be provided with slip ring 13 at the head piece place that goes out of pump.When in certain pumping circulation, if the flow that pumps is bigger than normal, then unnecessary fluid will flow into slip ring 3 automatically; And if the pump chamber output flow is less than normal, then slip ring 13 will flow out the deficiency of certain fluid with compensating flowrate, can reach the purpose of regime flow like this.

Claims (1)

1. the low-capacity pump that drives of an electric actuation artificial-muscle actuator, by flexible pump chamber, artificial-muscle actuator, inlet one-way valve, outlet one-way valve, sliding assembly, upper cover plate, base plate, front shroud, back shroud, left cover, right cover plate, drive controller parts are formed; It is characterized in that: the left end of flexible pump chamber connects left cover; The right-hand member of flexible pump chamber connects sliding assembly, and the artificial-muscle actuator connects flexible pump chamber, and inlet one-way valve connects left cover; The outlet one-way valve connects right cover plate; Upper cover plate connects left cover, left cover connects base plate, and front shroud connects base plate, back shroud connects base plate, and right cover plate connects base plate; Drive controller connects the artificial-muscle actuator through lead, and slip ring connects the delivery side of pump place.

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