CN104995407B - Pump and method for extended elasticity of pump membrane - Google Patents

Abstract

A pump comprising a pump housing member (1) having a chamber (21) with inner walls and an open end having a first area (25), the pump housing member (1) comprises an enlarged surface surrounding the open end of the chamber (21). The pump further comprises a second pump housing member (5) and a membrane element (32) with a second area (27). The membrane element (32) has a first central section having a third area (28) with same size as the first area (25) of the open end of the chamber (21). The membrane element (32) is arranged on the pump housing element (1) with the first central section positioned over the open end, forming a sealed chamber. A portion of the membrane element (32) is slidably clamped between the enlarged surface and the second pump housing member (5).

Description

The method of pump and the dilatational elasticity for pumping diaphragm

Technical field

Present invention relates in general to membrane pump field.The invention particularly relates to patient monitoring, monitoring of respiration, Anesthesia Monitoring In equipment, in particularly monitoring the medical science ventilation monitoring and gas analyser of patient respiration gas componant, use as sampling pump Membrane pump.

Background technology

Membrane pump has the advantages that simple structure, compact and good airproof performance.Therefore, sampling of the membrane pump as fluid analysis Pump is widely used in armarium and biochemical analysises.In medical science ventilation monitoring field, gasmetry module analysis membrane pump is from disease The gas gathered in people's breathing circuit, and in real-time monitoring patient breathing circuit gas constituent obtaining the shape of patient State.At present, gasmetry module is intended to miniaturization and has more preferable stability and lower energy consumption.Therefore, to relevant film The size of pump, the design in life-span and energy loss are put forward higher requirement.

The gas monitor apparatus of detected gas, such as induction apparatuss, usually precision element, to reduction the vibration of accuracy is measured Interference is very sensitive.Under normal circumstances, sampling pump is monitoring modular principal vibration source, so may cause to affect certainty of measurement Noise produce.Therefore, sampling pump needs to provide more stable sample.

The membrane pump of conventional design has the pump chamber of flat thin film and concave surface spherical in shape or the cylindrical shape with planar base surface Body.Thomas's membrane pump andPump belongs to this kind of membrane pump.Additionally, the thin film of this kind of membrane pump is typically outside Edge fixation is forming pump area.The elastic deformation of thin film of design limit as (the thin film external margin of this case is not fixed) Ability, while also limit the length of stroke of thin film.And pump area then limits the maximum pump pressure of membrane pump (because pump area and pump Active force can jointly limit maximum pump pressure) and fatigue life.Another problem is, when flat film matches are in the concave surface of cavity Or during flat surface, noise can be produced, at the same time, stroke will stop immediately producing mechanical vibration.

Therefore, it is necessary to provide a kind of improved membrane pump.Especially be to provide it is a kind of more smaller than existing membrane pump and There is more small vibration and more quiet membrane pump while higher pressure is provided.

The content of the invention

Consequently, preferably the purpose of the embodiment of the present invention be reduce or eliminate it is of the prior art one or more not Foot, shortcoming or problem, for example by the device that formed according to the dilatational elasticity of the pumping diaphragm with conservative pumping forces or method are provided come Any combination of single problem or multiple problems set forth above is reduced or eliminated, such as by for patient monitoring, breathing prison Survey, the device of Anesthesia Monitoring, are particularly useful for the device of medical science ventilation monitoring, and for monitoring gas componant during patient respiration Gas analyser.

The devices, systems and methods of the dilatational elasticity for being to provide the pumping diaphragm with conservative pumping forces disclosed herein.

It is disclosed for according to the one side for disclosing, including the pump of pump case, diaphragm element and the second pump case.Pump case includes cavity, Cavity includes wall and the opening with first area.Pump case includes the extended surface around cavity hatch end.Diaphragm element has There is second area.Pump case includes the extended surface of the opening around cavity.Diaphragm element has second area.Diaphragm element bag The first pars intermedia with the 3rd region is included, the size in the 3rd region is equal to the size of the first area of the opening of cavity.Every Membrane component is arranged on pump case and the first middle part is on opening, to form seal cavity.One of diaphragm element Divide and be slidably held between extended surface and the second pump case, retained part is radially moved and stretched when there is active force to apply Exhibition.

The advantage of this structure is to keep diaphragm element to be slidably mounted at the area bigger than the diameter in real work region Domain, therefore barrier film can freely radially move and expand.Bigger region causes barrier film expansible more, thus be capable of achieving compared with Long stroke (such as the amount of each stroke output is big).Also, due to radial motion, in the case of expansion is less, can keep Identical pump delivery, due to relatively low fatigue stress grade, the fatigue life of barrier film dramatically increases, for example, with compared with The long life-span.The elastic resistance of barrier film consumes less available active force, therefore available pump active force can be by more efficiently land productivity With.

First pars intermedia and cavity are all annular.

It is tilt internal wall in some example mesospores.Tilt internal wall is straight, or projection, or depression, or with two Or multiple radiuses, or for sinusoidal wave form shape, or for higher order polynomial waveform shape.

3rd region of the first pars intermedia of diaphragm element can be effective pump region.

The extended surface of pump case includes at least equal with the diaphragm element region of size.

In some examples, diaphragm element includes cocked bead.Cocked bead acts as O-ring, for strengthening close Envelope effect.

Extended surface includes groove, to install the cocked bead of diaphragm element.This can be used to be fixed on diaphragm element Pump case.

In some examples, diaphragm element includes thering is the pars intermedia of four-range second.Second pars intermedia is barrier film unit The core of part.Second pars intermedia is thicker than the other parts of diaphragm element.The other parts of the second element may be considered as ring Around the outer part of the second pars intermedia.Also, the 4th region of the second pars intermedia is less than the first area of the opening of cavity.

The advantage of the structure for disclosing here is, because stroke is slowed down in incrementally mode, stroke can be prevented to collide chamber The bottom of body, not only can make the noiseless stopping of stroke, and can minimize mechanicalness noise.Further, in close stroke At the end of, deceleration can reduce effective pump region of barrier film.Because stroke active force is constant, at the end of close stroke, Pump becomes higher.

Second pars intermedia can be annular.

In some examples, barrier film is made by elastomeric material.Material can be for rubber and/or for the one of llowing group of materials Kind：Chlorobutadiene, ethylene propylene diene rubber, fluorubber, silicon, thermoplastic elastomer (TPE) or nitrile.

In some examples, the second pars intermedia is 2-15 with the thickness proportion scope of the other parts of diaphragm element.

In further some examples, the ratio model in the 3rd region of the second area of diaphragm element and the first pars intermedia Enclose for 1.5-10.

In some examples, the second pars intermedia includes inclined outer wall, such as frustum, and inclined outer wall has more than top Base portion.

In some examples, the second pump case includes edge, and edge is cone, or including towards the opening Individual or multiple radiuses.

According to the another aspect for disclosing, a kind of method of the dilatational elasticity for pumping diaphragm is disclosed for.The method includes providing Pump as described herein.Apply reciprocating strokes to the first pars intermedia of diaphragm element to move, therefore a part for diaphragm element Slidably it is held between the extended surface of pump case and the second pump case, therefore retained part can freely be radially moved and stretched Exhibition.

It is emphasized that the word " including " used in this specification is for detailed characteristics, integer, step or element Presence, rather than exclude the presence or increase of one or more other features, integer, step, element or packets.

Description of the drawings

These and other aspect, feature and advantages in the example of exposure are it will be evident that and being taken off to the present invention by following The description of the embodiment of dew and the reference to accompanying drawing are illustrated, wherein：

Fig. 1 is the sectional view of pump case and barrier film in an example.

Fig. 2 is the sectional view of pump case and barrier film in an example.

Fig. 3 is the sectional view of membrane pump.

Specific embodiment

The specific embodiment for disclosing is described with reference to accompanying drawing.However, the content for disclosing can have various different performances Mode, however it is not limited to the form of expression disclosed herein.Of course, there is provided these embodiments can cause disclose content be complete It is face, complete, and protection scope of the present invention is fully conveyed to those skilled in the art.The enforcement that accompanying drawing is explained Specific term in the detailed description of example is not used to the content to disclosing and limits.In the example shown, like number is referred to Same element.

Explained below be devoted to describe the invention discloses embodiment in diaphragm element and membrane pump.Membrane pump conduct The sampling pump of device, these devices are used for patient monitoring, monitoring of respiration, Anesthesia Monitoring, and especially medical science ventilation is monitored and is For monitoring the gas analyser of gas componant during patient respiration.It is appreciated, however, that the ground present invention is not restricted to these Using, but can apply to need many other systems of fluid pump.

The membrane pump 100 that Fig. 1 is disclosed, in one example including pump case 1 and diaphragm element 6.Pump case is included with opening The cavity 21 at end, opening includes first area.Diaphragm element 6 is arranged on the opening of cavity 21 with seal cavity 21.

Cavity 21 includes inclined or chamfered wall 20.Inclined or chamfered wall 20 can be straight, the butt that such as Fig. 1 is disclosed The shape of cone.In some examples, inclined or chamfered wall 20 can be raised or depression.In other examples, Wall 20 has multiple radiuses.Can be sinusoidal wave form shape, wavy shape, polynomial waveform shape in other structures mesospore 20 Or rack shapes.Preferably cavity 21 is annular, but can also be other any shapes, for example square, rectangle, polygon Shape or ellipse.

In addition and/or alternatively, in some examples, the bottom section of cavity 21 has the region 25 less than opening Region 26.

Diaphragm element 6 includes second area 27 and the first pars intermedia with the 3rd region 28 (see Fig. 2).First pars intermedia For the core of diaphragm element 6.Therefore the 3rd region is less than second area 27.

Preferably diaphragm element for annular, but be alternatively other any shapes, for example square, rectangle, polygon or It is oval.Further, it is preferable to the first pars intermedia is annular, but other any shapes are alternatively, for example square, rectangle, many Side shape or ellipse.

The shape of diaphragm element and the first pars intermedia need not be identical, and for example, diaphragm element can be square, and in the middle of first Portion is annular.Preferably, the shape of the first pars intermedia is identical with the shape of the opening of cavity.

Preferably diaphragm element by can deformation or elastomeric material be made, such as rubber.Use in some instances Material can be chlorobutadiene, ethylene propylene diene rubber, fluorubber, silicon, thermoplastic elastomer (TPE) or nitrile.But those skilled in the art Member can use the other materials with similar characteristics.

In addition and/or alternatively, diaphragm element may include second pars intermedia with the 4th region 24.Second pars intermedia Thickness 23 more than diaphragm element other parts thickness 22.It is provided with the other parts of barrier film around the second pars intermedia Outer part.Preferably, the thickness 23 of the second pars intermedia and the proportion of the thickness 22 of the other parts of diaphragm element are 2-15.

Preferably, the second thicker pars intermedia protrudes from the rightabout of the opening of cavity.The wall of protuberance is inclination Or beveling, for example, frustum, or for raised, or for depression.Alternatively, in some examples, lobe Divide to be a part for round a part or semicircle.

Additionally, in some examples, it is preferable that the second thicker pars intermedia of diaphragm element may include less than opening Region.And on the center of the opening that the second thicker pars intermedia of diaphragm element may be disposed at cavity 21.

The most thick part of second pars intermedia a position as diaphragm element 6 harder core, from actuating The reciprocating strokes motion of device puts on the position, actuator can for voice coil motor, miniature motor, piston, cam or other What can make diaphragm element 6 be subject to the plant equipment of active force.It is thicker when diaphragm element is pressed into cavity 21 by stroke telemechanical Moving downward for the second pars intermedia be limited to the tilt internal wall 20 of cavity 21 a position, the diaphragm element 6 at the position The second pars intermedia become thicker.Stroke can be so caused gradually to slow down.So stroke can be not only caused to stop, can also be by machine Tool vibration is minimized.

Another advantage is that, when stroke gos deep into cavity, actual pump region, such as effective pump region diminishes, but Be stroke active force be identical.Therefore pump 100 becomes higher, for example, can produce larger pressure.Below equation can be used Represent：

P=F/A (1)

Wherein, P is pump pressure, and F is stroke active force, and A is effective pump region.

Further, this structure can prevent stroke from colliding the bottom of cavity.

Pump characteristicss according to demand, the shape and thickness 23 of thicker portion are transformable.Likewise, the inwall of cavity Shape is also transformable.

Additionally, in some examples, diaphragm element 6 may include cocked bead 30.Cocked bead 30 may be disposed at barrier film unit On the peripheral edge of part 6.Further, pump case 1 may include the extended surface of the opening around cavity 21.Extended surface may include Groove 31, to install the cocked bead 30 of diaphragm element 6.So as O-ring, sealing effectiveness can be strengthened.

Additionally, in some examples, extended surface may include at least with one region of region identical of diaphragm element 6.

Fig. 2 discloses the membrane pump 200 of another example.Membrane pump 200 includes pump case 1 and diaphragm element 32.Herein In description, the description that pump case 1 and diaphragm element 32 can be in Fig. 1 is built.

Alternatively, in some examples, pump case 1 may include a cavity 21, and cavity 21 may include spherical or flat Bottom surface.

The whole region 27 of diaphragm element 32 is elastic diaphragm region 27, and diaphragm element 32 covers the opening of cavity 21 Part is effective pump region 28 (for example, identical with the region 25 of opening).Additionally, in some examples, when diaphragm element 32 It is more than second pars intermedia (referring to Fig. 1) of the thickness 22 of the other parts of diaphragm element including thickness 23, effective pump region is (for example First pars intermedia) 28 more than the second pars intermedia region 24.

The shape of Fig. 2 descriptions differs primarily in that diaphragm element 32 is not integrally fixed at the side of cavity 21 with prior art Edge.On the contrary, a part for diaphragm element 32 be slidably held on the extended surface of pump case 1 and pump case 1 the second element 5 it Between.Second element 5 of pump case 1 can be barrier film fixed plate.Area between second element 5 and the extended surface of pump case 1 of pump case 1 Domain, when there is active force to apply, diaphragm element 32 can freely do radial motion and stretching, extension.

Additionally, in some examples, diaphragm element 32 is fixed on outer dia position, for example, by by cocked bead 30 The groove 31 of extended surface of pump case 1 is fixed on fixing.Region between fixing point and cavity 21, the barrier film of this structure Element 32 is still free to do radial motion and stretching, extension.

In order that a part for diaphragm element 32 can be in the extended surface of pump case 1 and two flat surfaces of the second element 5 Between slide, using more than effective pump region 28 Hookean region.So that diaphragm element 32 is expansible more, for example, produce more Long stroke, therefore the output of each stroke is more.

The slip retaining part of diaphragm element 32 is between barrier film fixing point (such as peripheral edge) and cavity 21.Work as holding During the length of stroke, in the case of less expansion, identical pump delivery can be kept, so due to less fatigue stress Grade, fatigue life increases.Also, compared with existing pump, both have the cavity of same size to the pump configuration that Fig. 2 is disclosed, But the elastic resistance of diaphragm element 32 consumes less available pump active force.Substitute what diagram was disclosed using flat diaphragm element Diaphragm element with thicker pars intermedia, can reach identical effect.

The coefficient of friction of the material of the pump case 5 of pump case 1 and second is little and be hard.In some examples, material can for polymer, Metal or synthetic material.

The problem of flat membrane surface collision concave spherical surface or plane is that both collisions can produce noise, and stroke movement Can stop immediately producing mechanical vibration.By design cavity 21 shape so that wall for cone or diaphragm element 32 compared with Firmly the region of (or thicker) has one or more radiuses, and stroke movement can be allowed gradually to slow down.Diaphragm element can be so caused to exist Stroke movement noiseless stopping during its terminal position, and due to gradually retarded motion, mechanical vibration are reduced.

In addition and/or alternatively, by by the edge designs of the second pump case 5 (such as barrier film fixed plate) coning, Or it is designed to that there are one or more radiuses in the region of diaphragm element 32 harder (thicker), also allow for stroke movement and gradually subtract Speed.The noiseless stopping of stroke movement when diaphragm element is in its turning point can be so caused, and due to gradually retarded motion, machinery Vibration is reduced.

Pump characteristicss according to demand and obtainable active force, cavity and barrier film fix wooden partition can be according to various different sides Formula is designed, such as chamfer, convexity radiuses or concave radius etc..

Additionally, the pump 200 that Fig. 2 is disclosed, in some examples, according to equation 1 before, the region 27 of elastic diaphragm element It is 1.5-10 with the preferred proportion scope between effective pump region 28.Stroke is longer, and the gap between two kinds of regions is bigger.

Fig. 3 discloses the sectional view of an example septation pump 300.Membrane pump 300 includes diaphragm element 33 (according to here Any structure of description) and pump case 1, and optional second pump case 5 (such as barrier film fixed plate) and cavity 21.In this example In, cavity 21 includes skew wall to support diaphragm element thicker region.Therefore stroke can be allowed gradually to slow down.

Further, pump includes pump head 12.In this example, pump head 12 supports the second pars intermedia of diaphragm element 33.Can Alternatively, in some examples, pump head may be mechanically connected to the top of the second pars intermedia, for example insert the second pars intermedia or Both are tightened by screw.When pump head 12 supports the top of the second pars intermedia, can be in the top of the second pars intermedia and pump head The region that supports both are sticked using adhesive.Binding agent can be glue, adhesive tape etc..

In the example of Fig. 3 descriptions, the actuator that active force is applied to diaphragm element 33 can be voice coil motor.Voice coil motor is used Diaphragm element 33 is transferred in the reciprocating strokes motion for producing pump head 12.Especially, voice coil motor can be cylindrical voice coil loudspeaker voice coil Motor.

In some examples, voice coil motor 13 is cylindrical structural, is fixed on pump head 12 and is placed in gap.Space quilt Magnetic cup with conical base 7, such as permanent magnet of circular cone Magnet 8, and unilateral circular cone pole shoe 9 surrounds.

Additionally, in order to substantially utilize the magnetic field of gap and reduce the size of pump 300, voice coil motor 13 can be Bone free air core coil, by winding from glutinous mode.This design make use of the advantage of the space confined space, thus can design compared with Little membrane pump 300.

In example disclosed by Fig. 3, magnetic cup includes the conical base 7 in the type of falling M.Circular cone pole shoe 9 and circular cone Magnet 8 The contact surface of the conical base of contact surface and circular cone Magnet and magnetic cup 7 is all taper.Taper surface all towards same direction by Gradual change is little.Such a structure increases the lateral area of circular cone pole shoe 9 so that the magnetic field in space is uniformly distributed in radial directions.

This design allows to use larger Magnet so that the magnetic flux inside pole shoe 9 can be preferably distributed.Enter One step, the shape of cone can be provided for the free axle of pump head 12 and preferably supported, and not increased in addition to cylindrical volume times What volume.Therefore, magnetic field is as big as possible when voice coil motor 13 works in space.

In Fig. 3, the operation principle of membrane pump 300 is：Voice coil motor 13 is placed in by unilateral pole shoe 9, circular cone Magnet 8 and has In the magnetic field that the magnetic cup of conical base 7 is formed.When alternating voltage is transferred to voice coil motor 13, voice coil motor 13 produces exchange Ampere force does shuttle linear motion to order about pump head 12.

Pump circulation can produce normal pressure and negative pressure circulation in cavity 21.When the pressure in sealing space is negative When, liquid will flow to cavity 21 from pumping hole.When the pressure in sealing space is positive, pump 300 is by outlet by liquid Discharge.

In the example that Fig. 3 is disclosed, using little voice coil motor barrier film can be driven to move along a straight line, therefore big transmission knot Structure can be omitted.Therefore the size of membrane pump 300 is reduced.Voice coil motor does not interfere with the working life of pump 300, because voice coil loudspeaker voice coil horse Up to the structure for not including easily abrasion.Voice coil motor directly drives diaphragm element 33, and without motion is changed, therefore do not have There is the consumption of intermediate energy.Further, the problem without starting torque here, therefore pump 300 almost may be used when applying little voltage Start immediately.Even if therefore in the driving voltage or less electric current for applying, voice coil motor can also export the effect of pump head 12 Power or displacement are collecting gobbet.

Also, the reciprocating of the FREQUENCY CONTROL pump head 12 of control voltage can be passed through.Because the amplitude of reciprocating The amplitude of electric current is depended on, by adjusting to the amplitude of the voltage of voice coil motor, the amount of liquid collected can be easily controlled.

Although here the present invention has described and explained several embodiments, those skilled in the art can easily think To a large amount of other methods and/or structure performing function as described herein, and/or obtain result as described herein and excellent Point, and each changes and/or modification is considered to be belonging to protection scope of the present invention.More put it briefly, it is of the invention Technical staff's all parameters as described herein easy to understand, size, material and structure be all exemplary, actual parameter, Size, material and/or structure depend on use the invention discloses content specialized application.

Claims (15)

1. a kind of pump includes：

Pump case (1), the pump case (1) includes cavity (21), and the cavity (21) is including inwall (20) and with first area (25) opening, the pump case includes the extended surface of the opening around the cavity (21)；

Second pump case (5)；

(6,32), (6,32) with second area (27), the diaphragm element includes having the to diaphragm element for the diaphragm element First pars intermedia (28) in three regions, the size in the 3rd region is equal to the first area of the cavity (21) opening (25) size；

Wherein the diaphragm element (6,32) be arranged on the pump case (1) and first pars intermedia (28) opened positioned at described On mouth end, to seal the cavity (21)；And wherein the diaphragm element (6,32) including being arranged at the diaphragm element (6, the cocked bead (30) of peripheral edge 32), the extended surface includes groove (31), and the cocked bead (30) is slided Be contained in the groove (31) so that the diaphragm element (6, peripheral edge 32) is not secured to the pump case (1), from And have down force put on the diaphragm element (6, when 32), the diaphragm element (6,32) in the extended surface and Region between second pump case (5) radially moves and expands.

2. pump as claimed in claim 1, it is characterised in that first pars intermedia (28) and the cavity (21) are all ring Shape.

3. pump as claimed in claim 1, it is characterised in that the inwall (20) is tilt internal wall, wherein the tilt internal wall For straight, or projection, or depression, or with two or more radiuses, or for sinusoidal wave form shape, or for higher order polynomial Waveform shape.

4. the pump as described in claims 1 to 3 any one, it is characterised in that the diaphragm element (6,32) described first 3rd region of pars intermedia (28) is effective pump region.

5. the pump as described in claims 1 to 3 any one, it is characterised in that the extended surface of the pump case (1) includes Size at least equal to the diaphragm element (6, region 32).

6. the pump as described in claims 1 to 3 any one, it is characterised in that the diaphragm element includes thering is the 4th region The second pars intermedia (24)；Wherein described second pars intermedia (24) is thicker and described than the other parts of the diaphragm element (32) The first area of 4th region of the second pars intermedia less than the cavity (21) opening.

7. pump as claimed in claim 6, it is characterised in that second pars intermedia is annular.

8. the pump as described in claims 1 to 3 any one, it is characterised in that and the diaphragm element (6,32) by elastomeric material It is made.

9. pump as claimed in claim 8, it is characterised in that the material for llowing group of materials one kind：Chlorobutadiene, ternary second Third rubber, fluorubber, silicon, thermoplastic elastomer (TPE) or nitrile.

10. pump as claimed in claim 7, it is characterised in that and second pars intermedia and the diaphragm element (6,32) its The thickness proportion scope of his part is 2-15.

11. pumps as described in claims 1 to 3 any one, it is characterised in that the second area of the diaphragm element with The proportion in the region of the first pars intermedia the 3rd is 1.5-10.

12. pumps as claimed in claim 6, it is characterised in that second pars intermedia includes inclined outer wall, the inclined outer wall With the base portion more than top.

13. pumps as described in claims 1 to 3 any one, it is characterised in that second pump case includes edge, the side Edge is cone, or including one or more radiuses towards the opening.

Pump described in claim 1 to 13 any one is used for patient monitoring, monitoring of respiration or Anesthesia Monitoring equipment by 14..

A kind of 15. methods of the dilatational elasticity for pumping diaphragm, including：

(6,32), the pump case (1) is including cavity (21), the cavity to provide pump case (1), the second pump case (5) and diaphragm element (21) opening including inwall (20) and with first area (25), the pump case (1) is included around the cavity (21) The extended surface of opening, and the diaphragm element (6,32) it is arranged on the pump case (1) to seal the cavity (21)；

To the diaphragm element (6, the first pars intermedia 32) applies reciprocating strokes motion, be arranged at the diaphragm element (6, 32) cocked bead of peripheral edge is being arranged at slip in the groove of the extended surface (31), therefore the diaphragm element (6,32) region between the extended surface and second pump case (5) radially move and stretch.