CN107869604A - Check-valves - Google Patents

Abstract

The present invention relates to check-valves (1).In order to provide the check-valves with the integrated flow sensorses that can be manufactured in a manner of simple and be inexpensive, according to the present invention, there is provided have the check-valves of following characteristics：With multiple through holes (4, 4a, main body (2) 4b), and conductive diaphragm (3), it is with being fixed in main body (2) and the inner area piece (3.1) with the first electrical contact (7), and with the mobile outside area piece (3.2) around the inner area piece, wherein described main body (2), which has, is arranged in the through hole (4, 4a, in region 4b) and it is connected at least one electrode (5 of the second electrical contact (8), 5a, 5b), and wherein, in closed position, barrier film (3) covers through hole (4, 4a, 4b), and outside area piece (3.2) is arranged to and at least one electrode (5, 5a, it is 5b) adjacent.

Description

Check-valves

Technical field

The present invention relates to check-valves.

Background technology

There are various known methods to be used for the flow for measuring the fluid by pipeline etc., i.e. gas or liquid in the prior art The flow of body.In this case, flow is considered volume flow (volume of per time unit) or mass flow is (every Chronomere's quality).Measurement apparatus for this purpose is sometimes referred to as flow sensor or flowmeter.Except such as elliptic gear Outside the mechanical solution such as flowmeter or turbine meter, also various other measuring methods (especially optics, electromagnetism, Based on ultrasonic wave), the current flow for detecting fluid can be allowed.Most of available methods provide the result of high quality, but logical Often implement very expensive.Particularly this, which is related to, limits the correlation of auto industry, and wherein cost plays a major role.

Have also been proposed solution flow sensor being integrated into check-valves.This check-valves can prevent fluid Flow in one direction and allow to flow in the other directions, this can be used in many different subregions.If need The measurement of flow is wanted, then is favourable into check-valves by corresponding sensor integration, because generally can be in this way Save space.However, solution as simple as possible and cheap in structure is also desirable herein.

In motor vehicle construction subregion, this check-valves with flow sensor can be used in braking booster system It is interior, such as cause the direction that can not only monitor the air flow of (such as vavuum pump) from brake booster to vacuum source, and Flow can also be measured.

The A1 of US 2008/0053537 disclose a kind of check-valves with valve body and wing plate, and the valve body has opening, should Wing plate is pivotably arranged on valve body and can open or close opening.First and second conductor elements are arranged on valve body, The interelement separates.3rd conductor element is arranged on wing plate, and is sized so that it can close first and Space between two conductor elements.According to arrangement, can by this way by the closure of circuit come detect the opening of wing plate or Closed mode.

The A1 of US 2012/0080621 disclose a kind of check-valves with valve body, wherein being disposed with spring-loaded closing Element.The sensor arrangement that can wirelessly inquire is in the side of closing element, and two antenna elements are arranged on sensor Both sides.The pressure that sensor is born can pass through the inside transmission of request signal and the response signal changed by sensor Receive to determine.

The A of US 3,587,326 disclose a kind of acceleration measurement device.Here, detection mass body is connected to elastic diaphragm On, the room of elastic diaphragm sealing fluid filling.Room is connected to by check-valves and is wherein disposed with the pipe of liquid metal pearl. The opposite side of pearl, pipe are merged into the room of a closing and are full of compressed gas.The relative wall section of pipe is by conductor element or resistance Element covers, and direction extends respectively in axial for conductor element or resistive element.Together with bead, the element forms circuit A part.Pass through its resistance, it may be determined that the position of bead, this is in turn again depending on the detection matter under the influence of acceleration Measure the position of body.

The B1 of US 8,800,473 describe a kind of flow sensor, and it has the matrix that can be inserted into such as pipe-line system Part and spring-loaded restriction element thereon is pivotably arranged in, the restriction element can be at least in part in rest position Put fill pipe cross section.Arch indicator part is arranged in restriction element, described when restriction element off normal rest condition Indicator part is moved in the indicator room of body portion.Indicator room can be transparent design, such as allow in vision The upper position for reading the restriction element corresponding to flow.Alternatively or additionally, can electrically record position, for example, passing through The magnetic element on hall effect sensor and indicator part on indicator room.

The A2 of WO 2013/018011 disclose a kind of micropump of hierarchy, and wherein silicon plate is arranged in two glass plates Between.Each plate is both provided with micro-structural, by the micro-structural form pump in itself with feeding and the part of passing away.Here Sensor is additionally provided, these sensors each include thin silicon diaphragm, and it is deformed in the case of pressure change.Due to barrier film Piezoresistive characteristic, this is relevant with the change of resistance, and resistance can be detected electrically.

The A of US 4,213,021 disclose a kind of check-valves with valve body, and spring-loaded pass is disposed with the valve body Element is closed, can be with valve body by the closing element.Closing element has magnet and the reed being arranged in the wall of valve body Switch, the switch are closed according to the position of closing element by magnet or opening.It is may infer that from the state of reed switch in valve Flow.In order to avoid causing the hysteresis effect opened or closed under visibly different flow velocity, closing element, which has, carries nose The special geometric configuration of shape part.There is the flow velocity in a certain displacement stroke of closing element to keep approximately uniform effect for this Fruit.

In view of pointed prior art, there is provided can be produced in a manner of simple and be inexpensive and as precisely as possible The check-valves for carrying out flow measurement still leaves some room for improvement.

The content of the invention

General object of the present invention is to provide with integrated flow sensorses and can be in a manner of simple and be inexpensive The check-valves of manufacture.

According to the present invention, the purpose is realized by the check-valves of the feature with claim 1, wherein dependent claims It is related to the advantageous embodiment of the present invention.

It should be noted that the feature individually presented in following description and measure can by it is any it is technically convenient in a manner of combine And produce the further embodiment of the present invention.The description characterizes and specified in addition the present invention, especially in conjunction with accompanying drawing.

The present invention provides check-valves.Here, according to the pressure differential of the both sides of valve, it is allowed to which fluid (i.e. gas or liquid) is along one Individual direction by and prevent its any kind of valve passed through in opposite direction to be considered as check-valves.Especially, according to the present invention Check-valves can be used for control gas (such as air) flow.Check-valves has the main body of multiple through holes.Main body also may be used To be referred to as valve body, and corresponding to the fixed part of the check-valves for example on fluid line or in fluid line.Therefore, It can have attachment means, such as receiving screw thread or the hole of screw.In operational conditions, through hole is used to allow fluid to lead to Cross check-valves.On the geometry of through hole, do not limit in the context of the present invention.For example, each through hole can flow It is lengthwise in the anticipated orientation that body passes through or short.

Check-valves also has conductive diaphragm, its with being fixed in main body and the inner area piece with the first electrical contact, and And with the mobile outside area piece around the inner area piece.Here, term " barrier film " means that this is at least in some area's piece Or it is the flexible body of sheet design in some districts piece.Here Liang Ge areas piece can be distinguished, wherein inner area piece is fixed in main body, And outside area piece is removable relative to main body (and inner area piece).Here, mobility is certainly relevant with the deformation of flexible partition.This In, outside area piece can especially raise from main body, you can be moved perpendicular to its surface.Inner area piece can be for example, by viscous Close or ultrasonic bonding is fixed in main body, but can also be mechanically anchored at thereon, such as pass through clamping.Described In arrangement, inner area piece is formed as the center of barrier film, and LHA piece forms its edge.

Barrier film is conductive, and this is made up of conductive material (such as polymeric matrix comprising conductive particle) completely including it Possibility, or alternatively, it is only partially electronically conductive, such as with conductive coating.In this case, the first electrical contact is set Internally on area's piece, such as allow attachment to current source or voltage source.Electrical contact can simply be designed very much, such as conduct Using the metallic pin of welding cable or plug connector can be used as.Can also be straight by the electrical lead for being fixedly attachable to check-valves Electrical contact is connected in succession.Such lead can also be designed to for example be formed the conduction on the circuit board of at least a portion main body Trace.Other conductive trace can be applied to this circuit board, and the layering cloth of multiple conductive traces insulated from each other Put and possible.Self-evidently, the first electrical contact is connected in an electrically conductive manner to barrier film or its current-carrying part.

In addition, main body has at least one electrode, it is arranged in the region of through hole and is connected to the second electrical contact.Institute Stating at least one electrode can be planar design and be formed at the surface of main body or lower section.It is connected to the second electricity and touched Head, so as to allow for example to apply voltage at least one electrode both ends via the second electrical contact.Here, electrode and the second electrical contact Between connection can be formed indirectly via at least one insertion element.In addition to the connection with the second electrical contact, at least one Individual electrode can be electrically insulated relative to outside (such as passing through dielectric), or it can make electrical contact with least in part.At least one Individual electrode is substantially conductive, therefore allows electric charge or electric current at least to be flowed in the electrode.On the first electrical contact The above statement of design is also applied for the second electrical contact.Second electrical contact allows attachment to current source or voltage source.Second electricity touches Head can be arranged in main body.

In closed position, barrier film covering through hole, outside area piece is adjacent at least one electrode arrangement.This certainly check-valves Closed position, wherein the valve prevents fluid from passing through in contrast to contemplated direction.In this case, barrier film is used as covering The closing element of through hole.Alternatively barrier film closes through hole or closes them by covering them.In order to as removable Dynamic closing element, barrier film cover through hole at least partially through moveable outside area piece.Through hole is preferably mainly by outside area piece Covering.In addition, outside area piece is arranged to adjacent with least one electrode, this includes outside area piece and contacted with least one electrode Possibility.Conductive diaphragm allows to detect close stance by measuring at least one electric variable with the close of at least one electrode Put.For example, at least one electrode can be used as to electrode by dielectric insulation, wherein conductive diaphragm.The electric capacity of device according to Outside area piece changes relative to the position of at least one electrode, and wherein closed position can be with specific, often feature Electric capacity is associated.Therefore, in this case, the first and second electrical contacts will be connected to the terminal of voltage source, cause the device Electric capacity dependence charging.

On the other hand, raised at least in part from main body in open position, outside area piece, it means that one side through hole is extremely Partially expose, outside area piece is removed from least one electrode on the other hand.Under any circumstance, this causes electrical property Change, such as causes the change of electric capacity, wherein the electrical measurement variable of change and the quantity of the through hole of exposure or exposed region it Between correlation be present.In the case of the check-valves according to the present invention, therefore beating for valve can be determined by measuring electric variable Open state or the flow for passing through valve.Geometry and material depending on various elements configure, related between measurand and flow Property may be very complicated, but can be determined for example, by the calibration in test.

Therefore, the present invention provides a kind of check-valves that can be used as flow sensor simultaneously.In this case, check-valves Can be with relatively easy, thus design cost is cheap.It is also possible to save space-efficient design.It is also to be noted that barrier film Outside area piece is typically unique movable part of valve, therefore is practically without wearing, and the obstruction of valve is virtually impossible to 's.Generally, unique movement is from main body elevated external area piece, i.e., is rubbed caused by not being moved relative to each other due to part Wipe.

As preferable selection, multiple contact elements are arranged in main body as electrode, and are connected by resistive element To the second electrical contact, wherein outside area piece is connected to contact element in the closed position in an electrically conductive way.Term " contact element Part ", which means to establish via each in these elements, to be electrically connected, it means that contact element be in itself it is conductive and/ Or at least a portion on its surface is conductive.Contact element can be formed as the even contact element in body surfaces.Here, Term " resistive element " of course means that resistance, and this refers to AC resistance, i.e. impedance in the broadest sense.Instead of using term " resistive element ", therefore term " impedor " can also be used.It is contemplated that wherein at least one resistive element is mainly with electricity The embodiment perhaps inductively to work, therefore AC resistance is dominated by reactance.However, resistive element is preferably as Europe Nurse resistance, therefore active pull-up is primary clustering.Term " resistive element " is not necessarily to be construed as the limit to resistance value or resistivity System.Therefore, in some cases, the resistance of each resistive element or resistivity may than conductive diaphragm resistance or resistivity more It is low.Each resistive element can be designed as such as thin film resistor, or in some other manner.Contact element is via resistance Element is connected to the second electrical contact so that in the case where being electrically connected to contact element, is connected to the contact element and second Resistive element between electrical contact is included in circuit.Resistive element can be arranged in main body or wherein.

In closed position, outside area piece is connected in an electrically conductive manner to contact element.Therefore, electrical connection is thereby establish, because At least on the side towards contact element, barrier film must be conductive for this.Therefore, in a closed position, from the first electrical contact Generally there is electrical connection via conductive diaphragm, contact element and resistive element to the second electrical contact.Therefore, electric current can flow It is dynamic, and according to the relation between voltage and current, it may be determined that the all-in resistance as the feature for closing the border closed position.If resistance Element works with electric capacity and/or inductively at least in part, then it is of course possible to applying alternating voltage.

On the other hand, raised at least in part from main body in open position, outside area piece, on the one hand mean through hole also extremely Partially expose, on the other hand, outside area piece can be only with some contact element contacts or in some cases not with contacting Element contacts.Due to the connection via resistive element, therefore the all-in resistance that can be measured between the first and second electrical contacts becomes Change, wherein correlation be present between the resistance and the through hole of exposure or the quantity of exposed region that measure.Therefore, resistance can be passed through The flow for measuring to determine the open mode of valve or pass through valve.Configured according to the geometry of various elements and material, resistance and flow Between correlation may be very complicated, but can be determined for example, by the calibration in test.

In the transition period from the closed to open position, preferably only a part for outside area piece first with main body Separation, so as to exposure through hole or some through holes, the wherein extention of outside area piece increases with pressure differential and continuously separated, and During the process, additional through hole gradually exposes.This divides along with outside area piece and the gradual of increasing contact element From this is associated with the consecutive variations of all-in resistance.In this respect, check-valves by similar to work in a manner of potentiometric (as long as Resistive element has active pull-up), but there is discrete electrical resistance, its septation or its outside area piece are used as regulating element.

It is contemplated that the various interconnection modes of contact element and resistive element, and this also includes such as series circuit.Connect Element is touched to be connected in parallel preferably relative to the second electrical contact.Being connected in series for contact element may cause evaluation problem, because One of these contact elements lose contact and can not contacted in any way on meterological with being related to losing for all contact elements Make a distinction.In the case where being connected in parallel, only when contact element corresponding to membrane contacts, the electricity associated with contact element Resistance element is connected to the first electrical contact via barrier film.

In one embodiment, at least some contact elements are arranged into the outside of through hole relative to inner area piece.This cloth The separation for promoting outside area piece and contact element is put, so as to allow more reliably to detect the position of barrier film.If barrier film is low Through hole, then if contact element is arranged in the side or inside of through hole, then barrier film and all contacts are only partially exposed under flow velocity May continuous contact between element.Especially, the first subgroup of external contact element can be arranged into the outer of through hole here Portion, and the second subgroup of interior contact element is arranged in the side or even internal of through hole.This arranged offset can promote The resolution ratio of measurement.During the continuous separation of outside area piece, the contact with external contact element can be stopped first, and only Have and be higher than high flow velocities, the contact with interior contact element also stops.

Generally, by measure resistance differentiate diaphragm support on which contact element and its be not supported on which contact It is practically impossible on element, therefore is also impossible to differentiate which through hole is exposed, which is not.Undeniably, manage By upper it is contemplated that by selecting suitable different resistance values for each resistive element, which resistance member differentiated from all-in resistance Part is connected with circuit.However, in fact, due to accuracy, this will be expensive and hardly possible realization.Cause This, in general, the statement only with respect to the quantity of exposed through hole is possible.Therefore, the element of check-valves is in the design It is as similar as possible and/or to be arranged symmetrically be favourable.In terms of similitude or symmetry, preferably various embodiments, its In some be discussed below.However, in addition to this it is possible to expect the different designs or unsymmetrical arrangement of element.

According to one embodiment, through hole and/or contact element are arranged symmetrically relative to center line.This may mean for example that Through hole or contact element each offset relative to each other 30 °, 45 °, 60 °, 90 ° (that is, generally 360 °/N, wherein N are Integer) etc..This may also mean that the subgroup for for example having two or more through holes or contact element, and wherein the element of subgroup is with institute The mode of description is offset relative to each other, but the element of different subgroups can offset relative to each other any desired angle. Alternatively, the unsymmetrical arrangement of through hole or contact element is also possible.This can be combined with other asymmetrical designs, as follows It is described.Generally, the unsymmetrical arrangement of through hole causes the asymmetric separation of barrier film.

Especially, all through holes can have identical cross section.This aspect is related to cross-sectional area, on the other hand relates to And the shape of cross section.Especially, this can be circular.It is also possible that all through holes away from center line with identical Distance arrangement.As a kind of modification, herein there may also be the subgroup of two or more through holes, it each has phase each other With cross section and/or be disposed in away from center line identical distance.Alternatively, it is conceivable that at least two through holes With different cross sections, this can aid in such as barrier film and is preferentially separated from the through hole of larger cross section.It is equally possible to change The correlation become between resistance and flow velocity.

As favourable possibility, barrier film can be asymmetrically formed relative to center line.Especially, this symmetrically matches somebody with somebody including circle The possibility put.On the whole, in the case of balanced configuration, it is impossible to dependent on what is also symmetrically occurred relative to center line The deformation of outside area piece.However, if the pressure differential of fluid flowed into were distributed in a manner of near symmetrical, the institute of outside area piece The deformation for having part may approximately uniform degree.In the long run, this may cause all areas to be loaded by identical, this There is a favorable influence to the service life of check-valves.Alternatively, the asymmetrical design of barrier film is possible, this generally leads Cause separates with the asymmetric of through hole.This may also be utilized in an advantageous manner.

Barrier film outside area piece from all contact elements completely it is elevated in the case of, between the first and second electrical contacts Circuit may be fully disconnected.In principle, such embodiment is possible.According to alternate embodiment, the first and second electrical contacts It is permanently connected to each other via reference resistor.Here, " for good and all " refer to during the normal operating of check-valves, i.e., in outside During area's piece separates with main body, connection will not disconnect.Can be the resistance selection difference of this reference resistor in principle Value.However, it should not be markedly inferior to the resistance value of resistive element, because in this case, the all-in resistance of system will Controlled by reference resistor, this may make measurement more difficult.If reference resistance is significantly higher than the resistance value of resistive element, It is so on meterological and unfavorable.Permanently connected between first and second electrical contacts can be via the inner area piece of barrier film There is provided, such as or via the single connection that can be arranged in main body.

It is favourable that each contact element is connected to the second electrical contact via resistive element, wherein all resistive elements have Identical resistance.Always this has the effect of all-in resistance identical change, no matter which or its mistake in membrane contacts contact element The contact with which contact element gone.But or it is also possible with the resistive elements of different resistance.

If each through hole distributes at least one contact element, measurement accuracy can be significantly increased.This means for Each through hole provides at least one contact element and possible one group of contact element.The contact element so distributed is arranged to phase Approached for respective through hole space.Therefore, contact element loses contact with close phase be present between the exposure of corresponding through hole Guan Xing.

In principle, operation of the flexible barrier film to check-valves is enough, wherein fluid or pressure simply by flowing It is possible that power difference, which is moved into closed position,.However, in order to allow reliably to close through hole, it is preferable that outside area piece can Flexibly to deviate closed position.That is, due to pressure differential caused by fluid, outside area piece can expose through hole with it Mode deviates, although the deviation is elastic, it means that and restoring force occurs, once there is no external pressure is poor or outer masterpiece With outside area piece returns to closed position by the restoring force.In this case, closed position can correspond to outside area piece Slack position, or LHA piece can be pressed against main body in advance in a closed position.In order to realize elastic deflection, particularly may be used So that the flexible design of barrier film itself.Alternatively, the additional return element acted on barrier film can also be provided.

It is desirably integrated into according to the check-valves of the present invention in many different systems, wherein the function of actual valve should be with section The mode of save space and low cost is combined with measurement flow.In the system for brake boost, for example, check-valves can be inserted Enter the connecting line between brake booster and vacuum source (mechanically or electrically moving the vavuum pump of operation or the inlet manifold of engine) In.This allows to determine flow in a straightforward manner.This opens various possibilities, such as the leakage in detecting system, and Direct pressure measxurement need not be carried out in brake booster.Therefore, it can be determined indirectly or estimate in brake booster Expecting pressure.The pressure in expecting pressure and vacuum source in brake booster, can obtain expected flow.If The desired flow and the flow measured are inconsistent, then may be from this deduction leakage.Compared with the prior art systems, this is favourable , prior art systems depend on this fault diagnosis measured the direct pressure in brake booster, due to needing at that In integrated pressure sensor, so this is complicated and costliness.On the contrary, being cheap according to the check-valves of the present invention and can be with It is easily integrated.

Brief description of the drawings

The further favourable details of the present invention is explained in greater detail below by the illustrative embodiment shown in accompanying drawing And effect, wherein：

Fig. 1 shows the perspective view of the check-valves in the closed position according to the present invention；

Fig. 2 shows the diagram for the check-valves for not having septate Fig. 1；

Fig. 3 shows the diagram of Fig. 1 in an open position check-valves；And

Fig. 4 shows the plan for the check-valves for not having septate Fig. 3.

Embodiment

In various accompanying drawings, identical part all has identical reference in all cases, and therefore, they are usual It is only illustrated once.

Fig. 1 schematically shows the perspective view of the check-valves 1 according to the present invention.Check-valves 1, which has to be fixed with thereon, leads The main body 2 of electric separator 3.In this arrangement, the inner area piece 3.1 of barrier film 3 is for example, by bonding or being fixedly clamped in main body 2 On, and in the example considered, the significantly bigger outside area piece 3.2 of area can move relative to main body 2.In the process In, outside area piece 3.2 can bend and therefore be raised from the surface 2.1 of main body.Inner area piece 3.1, which has, is connected to circuit 11 First electrical contact 7.Electrical contact 7 can also be optionally for by the positive or negative connection of diaphragm 3 and main body 2.Here, main body 2 has Circular cross section, and be symmetrical relative to center line A as barrier film 3.However, it is also possible to expect other shapes, such as Ellipse or rectangle.Main body 2 can be provided with screwing element or hole for screw, for example, passing through the screwing element or hole, spiral shell Nail can be fixed in fluid line.

The remainder of the structure of check-valves 1 is explained with reference to the partial view in figure 2, its septation 3 is omitted.Main body 2 have total of six through hole 4, each have identical circular cross section, each of which is relative to each other with identical with center line A 60 ° of ranging offset.Through hole 4 is used to allow fluid (such as air) to pass through main body 2.However, if fluid is in the side of barrier film 3 With higher pressure, then through hole 4 is closed by barrier film 3, i.e., check-valves 1 is in the closed position shown in Fig. 1.

One row's contact element 5 is formed on surface 2.1, and the contact element is outwards offset relative to through hole 4, and herein Be shown as circle, although this be considered as it is pure illustrative.Can be in two each with six contact elements 5 Made a distinction between subgroup, two subgroups are in relative to each other away from distance slightly different center line A.However, in general, Contact element 5 is arranged symmetrically relative to center line A, and each through hole 4 can be allocated two contact elements 5.Each connect Element 5 is touched to be connected on the second electrical contact 8 in main body 2 via resistive element 6.Second electrical contact 8 is connected similarly to circuit 11. In the current situation, resistive element 6 is identical, and can be designed as the oxidation of the metal for example on surface 2.1 Thing thin film resistor.Here, for example, the resistivity of each resistive element 6 can be higher than the resistivity of barrier film 3 10 times.

In addition, the first electrical contact 7 is connected to the second electrical contact 8 via reference resistor 9.The resistance value of reference resistor 9 Typically at least with the resistance value same order of resistive element 6, i.e., should not significantly reduce.By reference to resistor 9, circuit 11 connects Continuous closure, the circuit also include measurement apparatus 10, and it includes such as voltage source, and the electric current in measuring circuit 11 is to determine All-in resistance.

In addition, if barrier film 3 is connected to contact element 5, the first electrical contact 7 and the second electric contact 8 by outside area piece 3.2 Between circuit 11 can by conductive diaphragm 3 and in each case a contact element 5 and a resistive element 6 close. In this arrangement, the resistive element 6 between electrical contact 7,8 and reference resistor 9 and alternatively with other resistive elements 6 simultaneously Connection connection.Therefore, the increase of the quantity for the contact element 5 that the all-in resistance that can be measured between electrical contact 7,8 contacts with barrier film 3 And reduce.In the closed position shown in Fig. 1, barrier film 3 is supported on all contact elements 5 by outside area piece 3.2, as a result always Resistance is minimum.

Barrier film 3 is made up of elastomeric material, and wherein outside area piece 3.2 is loose in the closed position shown in Fig. 1.However, Closed position can flexibly be deviateed by the Fluid pressure to be worked from the side of through hole 4, make its surface 2.1 from main body 2 Completely or partially raise.This state is shown in figs. 3 and 4, and it shows that check-valves 1 is in an open position.Here, outside The partly elastic bending of area of portion piece 3.2, result are raised from surface 2.1.Fig. 4 be without the plan for showing barrier film 3, Although the region F for being decorated with hacures represents the part on the surface 2.1 at the place of barrier film 3.Due to outside area piece 3.2, part rises Height, some through holes 4 at least partly expose, therefore fluid can flow through, and other through hole 4a continue to be closed by barrier film 3.Due to outer Area of portion piece 3.2 raises from surface 2.1, also there is some contact elements 5b separation, and other contact elements 5a continues to connect with barrier film 3 Touch.No longer it is a part for circuit 11 now with the resistive element 6 that separated contact element 5b has been electrically connected of barrier film 3.Survey Amount device 10 can record corresponding resistance increase.

Therefore, the increase of flow and the increase of resistance are relevant.It is difficult to generally in complexity and in theory the corresponding relation drawn It can be determined by a series of calibration in tests.

Reference numerals list：

1 check-valves

2 main bodys

2.1 surface

3 barrier films

3.1 first area's pieces

3.2 second area's pieces

4th, 4a, 4b through hole

5th, 5a, 5b contact element

6 resistive elements

7th, 8 electrical contact

9 reference resistors

10 measurement apparatus

11 circuits

A center lines

F regions

Claims (10)

1. a kind of check-valves, including：

Main body (2) with multiple through holes (4,4a, 4b), and

Conductive diaphragm (3), the conductive diaphragm (3) is with being fixed in the main body (2) and with the first electrical contact (7) Inner area piece (3), and there is the mobile outside area piece (3.2) around the inner area piece,

Wherein described main body (2), which has, is arranged in the region of the through hole (4,4a, 4b) and is connected to the second electrical contact (8) At least one electrode (5,5a, 5b), and

Wherein, in closed position, the barrier film (3) covers the through hole (4,4a, 4b), and the outside area piece (3.2) cloth It is set to adjacent with least one electrode (5,5a, 5b).

2. check-valves according to claim 1,

It is characterized in that

Multiple contact elements (5,5a, 5b) are arranged in the main body (2) as electrode, and are connected via resistive element (6) To second electrical contact (8), wherein the outside area piece (3.2) is connected in an electrically conductive manner to described connect in the closed position Touch element (5,5a, 5b).

3. check-valves according to claim 2,

It is characterized in that

The contact element (5,5a, 5b) is connected in parallel relative to second electrical contact (8).

4. check-valves according to any one of the preceding claims,

It is characterized in that

At least some contact elements (5,5a, 5b) relative to the inner area piece (3.1) be arranged in the through hole (4,4a, Outside 4b).

5. check-valves according to any one of the preceding claims,

It is characterized in that

The through hole (4,4a, 4b) and/or the contact element (5,5a, 5b) are arranged symmetrically relative to center line (A).

6. check-valves according to any one of the preceding claims,

It is characterized in that

All through holes (4,4a, 4b) are arranged in away from the center line (A) identical distance.

7. check-valves according to any one of the preceding claims,

It is characterized in that

The barrier film (3) is asymmetrically formed relative to the center line (A).

8. check-valves according to any one of the preceding claims,

It is characterized in that

First electrical contact (7) and the second electrical contact (8) are permanently connected to each other via reference resistor (9).

9. check-valves according to any one of the preceding claims,

It is characterized in that

Each contact element (5,5a, 5b) is connected to second electrical contact (8) via resistive element (6), wherein all described Resistive element (6) has identical resistance.

10. check-valves according to any one of the preceding claims,

It is characterized in that

The outside area piece (3.2) can the elasticity deviation closed position.