CN104813027B - Progressive pump force regulation - Google Patents

Abstract

A pump comprising a membrane element and a pump housing having a chamber with bevelled inner walls. The chamber comprises an open end having a third area. The membrane element has a first area, and comprises a central section with a second area which is surrounded by a periphery section. The central section is thicker than the periphery section. Further, the second area of the central section is smaller than the third area of the open end of the chamber and the membrane element is arrangable over the pump housing forming a sealed chamber, whereby the central section of the membrane element is arranged over the open end, and the central section is protruding away from the chamber.

Description

Gradual pumping action power regulation

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, particularly monitor in the medical science ventilation monitoring and gas analyzer of patient respiration gas componant, used as sampling pump Membrane pump.

Background technology

Membrane pump has the advantages that simple structure, compact and good airproof performance.Therefore, membrane pump as fluid analysis sampling Pump is widely used in Medical Devices and biochemical analysis.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 minimize and with more preferable stability and lower energy consumption.Therefore, to relevant film The size of pump, the design in life-span and energy loss propose requirement higher.

The gas monitor apparatus of detection gas, such as inductor, usually precision element, measures reducing the vibration of accuracy Interference is very sensitive.Under normal circumstances, sampling pump is monitoring modular principal vibration source, may so cause to influence 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 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 film of this kind of membrane pump is typically outside Edge fixation is forming pump area.It is such to design the elastic deformation ability for limiting film, while also limit the stroke of film Length.And pump area then limits the maximum pump pressure (because pump area can jointly limit maximum pump pressure with pumping action power) of membrane pump And fatigue life.Another problem is, when flat film matches are in the concave surface of cavity or flat surface, noise to be produced, with this Meanwhile, stroke will stop producing mechanical oscillation immediately.

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 provide device that the claim adjusted according to attached gradual pumping action power formed or Method reduces or eliminates any combination of single problem set forth above or multiple problems, for example by for patient monitoring, The device of monitoring of respiration, Anesthesia Monitoring, particularly for the device of medical science ventilation monitoring, and for monitoring gas during patient respiration The gas analyzer of body composition.

The devices, systems and methods for being to provide gradual pumping action power regulation disclosed herein.

According to the one side for disclosing, the diaphragm element for the pump with cavity is disclosed for.Diaphragm element has the firstth area Domain and including the pars intermedia with second area, pars intermedia is surround by outer part.Pars intermedia is thicker than outer part, and the second of pars intermedia Region is less than a region of the openend of the cavity, and the pars intermedia is arranged on the region.

Further, according to the one side for disclosing, a kind of pump of pump case including diaphragm element and with cavity is disclosed for, chamber Body includes tilt internal wall.Cavity includes the openend with the 3rd region.Diaphragm element has first area, and including having The pars intermedia of second area, pars intermedia is surround by outer part.Wherein pars intermedia is thicker than outer part.Further, the second of pars intermedia Region is less than the 3rd region of the openend of cavity, and diaphragm element is arranged on pump case to form seal cavity, therefore barrier film The pars intermedia of element is arranged on openend, and pars intermedia protrudes from the direction away from cavity.

The advantage of this structure is that, because stroke slows down in a progressive way, can prevent stroke from colliding the bottom of cavity Portion, and make the noiseless stopping of stroke, mechanical oscillation are minimized.Further, at the end of close to stroke, deceleration reduce every Effective pump region of film.Because stroke active force is constant, at the end of close to stroke, pump becomes stronger.

In some examples, pars intermedia is annular.

Diaphragm element is made by elastomeric material, such as rubber and/or the one kind for llowing group of materials：Chlorobutadiene, three First EP rubbers, fluorubber, silicon, thermoplastic elastomer (TPE) or nitrile.

In some examples, pars intermedia is 2-15 with the thickness proportion scope of outer part.

In some examples, first includes cocked bead.Such as O-ring, cocked bead is used to strengthen sealing effectiveness.

In some examples, thicker pars intermedia has an inclined outer wall, such as truncated cone, and inclined outer wall has and is more than The base portion at top.

In some examples for disclosing, pars intermedia and cavity are all annular.

In some examples for disclosing, tilt internal wall is straight, or projection, or depression, or with two or more half Footpath, or be sinusoidal waveform shape, or be higher order polynomial waveform shape.

In some examples, diaphragm element include effective pump region, effective pump region include almost with the openend of cavity The 3rd region identical region.

In some examples, pump case include around the openend of cavity extended surface, extended surface have at least with every The size identical region of membrane component.

In some examples for disclosing, diaphragm element is held between the extended surface of pump case and the second element of pump case.

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 stretch.Therefore stroke (such as amount of each stroke output more long can be realized Greatly).Also, due to radial motion, identical pump delivery can be kept in the case of expansion is less, because relatively low fatigue should Power grade, the life-span of barrier film increases, and available pump active force can be utilized efficiently.

Extended surface includes groove, to install the cocked bead of diaphragm element.

According to the another aspect for disclosing, a kind of method for the regulation of gradual pumping action power is disclosed for.The method includes Pump as described herein is provided, and applies reciprocating strokes to the pars intermedia of diaphragm element and move, stroke movement is a position The tilt internal wall for being limited to cavity is put, becomes thicker in the pars intermedia of the position diaphragm element.

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

Brief 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 may be such that the content of exposure is complete It is face, complete, and protection scope of the present invention is fully conveyed to those skilled in the art.The implementation that accompanying drawing is explained Specific term in the detailed description of example is not used to limit the content for disclosing.In the example shown, like number is referred to Same element.

Following description be devoted to description 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 Gas analyzer for monitoring 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 includes thering is opening The cavity 21 at end, openend includes first area.Diaphragm element 6 is arranged on the openend 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 waveform 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 includes the region 25 less than openend 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 It is 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 is alternatively other any shapes, such as square, rectangle, many Side shape or ellipse.

The shape of diaphragm element and the first pars intermedia need not be identical, 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 openend 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 openend of cavity.The wall of protuberance is inclination Or beveling, for example, truncated cone, or be raised, or be depression.Alternatively, in some examples, protrusion Portion can 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 the area smaller than opening Domain.And on the center of the openend 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.Can so cause that stroke gradually slows down.The noiseless stopping of stroke can be not only so caused, can be with Mechanical oscillation are minimized.

Another advantage is that, when stroke gos deep into cavity, actual pump region, such as effective pump region diminishes, but It is that stroke active force is identical.Therefore pump 100 becomes stronger, 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 characteristics 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 openend for surrounding 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 one region of region identical at least with 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, the openend of the covering cavity 21 of diaphragm element 32 Part is effective pump region 28 (for example, identical with the region 25 of openend).Additionally, in some examples, when diaphragm element 32 Second pars intermedia (referring to Fig. 1) of the thickness 22 including thickness 23 more than the other parts of diaphragm element, 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 pump case 1 extended surface 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 for being fixed on the extended surface of pump case 1 is fixed.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 the part for obtaining diaphragm element 32 can be in the extended surface of pump case 1 and two flat surfaces of the second element 5 Between slide, use the Hookean region more than effective pump region 28.So that diaphragm element 32 is expansible more, for example, produce more Stroke long, therefore the output quantity 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 small 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 producing mechanical oscillation immediately.By the shape for designing cavity 21 so that wall for cone or diaphragm element 32 compared with The region of (or thicker) has one or more radiuses firmly, and stroke movement can be allowed gradually to slow down.So may be such that diaphragm element exists Stroke movement noiseless stopping during its terminal position, and due to gradually retarded motion, mechanical oscillation reduction.

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 is so may be such that, and due to gradually retarded motion, machinery Vibration is reduced.

Pump characteristics 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 radius 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 more long, and the gap between two kinds of regions is bigger.

Fig. 3 discloses a sectional view for 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 the thicker region of diaphragm element 33.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 binder.Adhesive 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 are surrounded.

Additionally, for magnetic field substantially using gap and the size of reduction pump 300, voice coil motor 13 can be nothing Bone air core coil, winds by from glutinous mode.It is this to design the advantage that make use of the space confined space, therefore can design smaller Membrane pump 300.

In example disclosed by Fig. 3, magnetic cup is included in the conical base 7 of 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 small.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 is allowed 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 preferably be supported for the free axle of pump head 12 be provided, 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, barrier film can be driven to move along a straight line using small voice coil motor, 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 easy abrasion.Voice coil motor directly drives diaphragm element 33, and is changed without by motion, therefore does 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 small voltage Start immediately.Even if therefore in the driving voltage or smaller electric current for applying, voice coil motor can also export the effect of pump head 12 Power or displacement are collecting gobbet.

Also, can be by the reciprocating of the FREQUENCY CONTROL pump head 12 of control voltage.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 being collected into can be easily controlled.

Although the present invention has described and explained several embodiments herein, those skilled in the art is easily envisaged that A large amount of others methods and/or structure are 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 be readily appreciated that all parameters as described herein, size, material and structure be all exemplary, actual parameter, Size, material and/or structure depend on using the invention discloses content specialized application.

Claims (16)

1. a kind of pump includes：

Diaphragm element；

Pump case, the pump case includes the cavity with tilt internal wall, and the cavity includes the openend with first area；

The diaphragm element has second area, and including the first pars intermedia with the 3rd region, first pars intermedia It is surround by outer part, wherein first pars intermedia is thicker than the outer part, the 3rd region of first pars intermedia is small In the first area of the openend of the cavity, the diaphragm element is arranged on the pump case to form annular seal space Body, therefore first pars intermedia of the diaphragm element is arranged on the openend, wherein the first pars intermedia court Away from the direction protrusion of the cavity；

Also, when using, stroke movement is applied to first pars intermedia of the diaphragm element, the diaphragm element is pressed The cavity is depressed into, wherein moving downward for first pars intermedia is limited in the inclination of the cavity a position Wall.

2. pump as claimed in claim 1, it is characterised in that first pars intermedia is annular.

3. pump as claimed in claim 1, it is characterised in that the barrier film is made by elastomeric material.

4. pump as claimed in claim 3, it is characterised in that the material is rubber and/or the one kind for llowing group of materials：Neoprene Diene, ethylene propylene diene rubber, fluorubber, silicon, thermoplastic elastomer (TPE) or nitrile.

5. the pump as described in Claims 1-4 any one, it is characterised in that first pars intermedia and the outer part Thickness proportion scope is 2-15.

6. the pump as described in Claims 1-4 any one, it is characterised in that the diaphragm element includes cocked bead.

7. the pump as described in Claims 1-4 any one, it is characterised in that first pars intermedia includes inclined outer wall, institute Stating inclined outer wall has the base portion for being more than top.

8. the pump as described in Claims 1-4 any one, it is characterised in that first pars intermedia and the cavity are all Annular.

9. the pump as described in Claims 1-4, it is characterised in that the tilt internal wall is straight, or projection, or depression, Or with two or more radiuses, or be sinusoidal waveform shape, or be higher order polynomial waveform shape.

10. the pump as described in Claims 1-4 any one, it is characterised in that the diaphragm element includes effective pump region, Effective pump region has the first area identical region with the openend of the cavity.

11. pump as described in Claims 1-4 any one, it is characterised in that the pump case is included around the cavity hatch The extended surface at end, the extended surface have at least with the size identical region of the diaphragm element.

12. pumps as claimed in claim 11, it is characterised in that the diaphragm element is slidably held on the described of the pump case Between extended surface and the second element of the pump case.

13. pumps as claimed in claim 12, it is characterised in that the diaphragm element includes cocked bead, the extended surface Including groove, to install the cocked bead of the diaphragm element.

A kind of 14. methods for the regulation of gradual pumping action power, including：

Pump case is provided, the pump case includes the cavity with tilt internal wall, and the cavity includes the openend with first area；

Diaphragm element is provided, the diaphragm element has second area, and including the first pars intermedia with the 3rd region, institute The first pars intermedia is stated to be surround by outer part, wherein first pars intermedia is thicker than the outer part, the institute of first pars intermedia The first area of the 3rd region less than the openend of the cavity is stated, the diaphragm element is arranged on the pump case To form seal cavity, therefore first pars intermedia of the diaphragm element is arranged on the openend, wherein described First pars intermedia protrudes towards the direction away from the cavity；

Apply reciprocating strokes to first pars intermedia of the diaphragm element to move, the diaphragm element is pressed into institute Cavity is stated, wherein moving downward for first pars intermedia is limited to the tilt internal wall of the cavity a position.

15. by the pump described in claim 1 to 13 any one, for patient monitoring, monitoring of respiration or Anesthesia Monitoring equipment.

16. by the method described in claim 14, for patient monitoring, monitoring of respiration or Anesthesia Monitoring equipment.