CN104300957A - High voltage resistant inductance approach switch - Google Patents
High voltage resistant inductance approach switch Download PDFInfo
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- CN104300957A CN104300957A CN201410412514.8A CN201410412514A CN104300957A CN 104300957 A CN104300957 A CN 104300957A CN 201410412514 A CN201410412514 A CN 201410412514A CN 104300957 A CN104300957 A CN 104300957A
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Abstract
The invention relates to a high voltage resistant inductance approach switch, which comprises a shell body, a circuit device and a connecting element and is characterized in that the internal circuit is located inside the shell body and used for generating and processing signals; the connecting element is electrically connected with the internal circuit device and used for connecting the internal circuit to an external device; and the shell body comprises an induction layer and a packaging shell, the induction layer is connected to the packaging shell, the circuit device is located inside the packaging shell, the induction layer is connected to the packaging shell in a integrated molding mode, and the induction layer has a certain thickness, and the circuit device is adjusted, thereby enabling the circuit device to generate low-frequency signals within a certain range, and acquiring an induction distance of the certain range.
Description
Technical field
The present invention relates to a kind of proximity switch, further, relate to a kind of proximity switch adopting metal package, its sensitive surface has the performance that better anti-high-pressure fluid impacts, and the electric property of better anti-lightning surge impact.
Background technology
Inductance approach switch is a kind of proximity switch for detecting moving metal parts, and metal is producing eddy current close to inner during sensitive surface, and eddy current absorbs oscillation energy, makes the oscillations in proximity switch, until failure of oscillation.
Traditional inductance approach switch mainly comprises a housing unit, with an internal circuit, this internal circuit is encapsulated in this housing unit, for generation of oscillating magnetic field and processing signals, this housing unit comprises a sensitive surface and encapsulating housing, detected metal parts is relative with this sensitive surface in testing process, this internal circuit comprises an inductive means, this inductive means is relative with the sensitive surface of this housing unit, that is, in metal detection process, detected parts and inductive means are positioned at the both sides of this sensitive surface, when reaching detecting distance, the eddy current that detected metal and metal parts produce makes the oscillating magnetic field of induced inside parts weaken, thus change switch control rule amount into by internal circuit.
Distance of reaction is a vital parameter of proximity switch, because electromagnetic wave will through sensitive surface and external metallization induction, so the material of sensitive surface and thickness have significant impact for distance of reaction, in some work condition environments, structure for sensitive surface and encapsulating housing also there are certain requirements, and such as in fluid high-pressure environment, sensitive surface requires can be high pressure resistant, obtain structure withstand voltage and ensure certain effective distance of reaction, this is the aspect that inductance approach switch needs to break through.
Existing more common a kind of inductance approach switch, in order to ensure certain resistance to pressure, need the thickness increasing sensitive surface, simultaneously in order to ensure certain distance of reaction, reduce the impact of sensitive surface for induction process, sensitive surface is made up of pottery or plastic material, sensitive surface adopts glue or alternate manner fix and are connected to encapsulating housing, for the sensitive surface of this ceramic material, advantage is that sensitive surface is less for the impact of induction process when increasing thickness, there are some shortcomings simultaneously, such as when detecting the shift position of the piston in cylinder or in hydraulic cylinder, on the one hand, in long-term fluid high-pressure environment, easily there is crackle in ceramic induction face, external fluid enters encapsulating housing inside, damage internal circuit, allomeric function is caused to lose efficacy, that is, the selection of material reduces the interference to induction process, but also bring other unfavorable characteristics of material itself simultaneously, especially be on active service and show unfavorable factor in fluid high-pressure environment, according to verification experimental verification, through the impact of long-term 500bar fluid high-pressure, very easily there is slight crack in the sensitive surface of this kind of structure, cause Total Product disabler, on the other hand, the seaming position of sensitive surface and encapsulating housing is also structural weak points, the stability of the connected mode extreme influence structure between two unlike material parts, in the prior art, adopt the attachments such as glue to connect sensitive surface and encapsulating housing, easily lost efficacy in fluid high-pressure operating mode, sensitive surface is connected instability with encapsulating housing, even depart from, and then have influence on internal circuit.
The another kind of structure of sensitive surface and encapsulating housing is that sensitive surface is connected to encapsulating housing integratedly, that is, sensitive surface adopts the metal material identical with encapsulating housing, one of obvious problem existed in this structure, be exactly the impact of thickness for induction process and distance of reaction of sensitive surface, in the process of the electromagnetic wave sense metal detection thing of oscillating magnetic field generation, first sensitive surface will be passed, so the material of sensitive surface is most important for induction process, select metal material, mean that sensitive surface can produce interference effect for oscillating electromagnetic wave, when thickness is less, disturb relatively little, so less for distance of reaction impact, same resistance to pressure is poor, when increasing thickness, enhance resistance to pressure, sensitive surface strengthens for the interference of oscillating electromagnetic wave, distance of reaction reduces, to certain thickness, there is no distance of reaction, that is, lose the effect of proximity switch completely, so the contradiction between the thickness of metal material and distance of reaction makes this structure cannot realize the performance of good fluid-resistant high pressure.
On the other hand, for the sensitive surface of metal material, another problem of existence is the selection of frequency of oscillation, when adopting pottery or plastics, do not need to consider the difference of frequency and the sensitive surface that the causes size for the impact of induction process, and when adopting metal material, select different frequencies different for the influence of induction process, that is, same metal material, same thickness, different frequency of oscillation, sensitive surface is different for the impact of induction process, and distance of reaction is different.
Material, frequency of oscillation, the composite factors such as thickness affect induction process simultaneously, and then determine distance of reaction size or with or without, therefore complicated between each variable relation, make must obtain there is certain thickness and the good metal material sensitive surface of resistance to pressure, and ensure that certain effective distance of reaction is the aspect that prior art cannot break through.
In addition, also there are some an open questions for existing inductance approach switch, wherein a problem is, the poor-performing of anti-lightning surge impact, be not suitable for outdoor work and application, another one problem is, for electronic devices and components, need to be tested by electromagnetic compatibility EMC, the electric property of detected electrons components and parts, but be that EMC Testing index is poor for the common problem that existing product exists, that is, the electric property of electromagnetic compatibility is poor.
Summary of the invention
Main purpose of the present invention is to provide a kind of inductance approach switch, and it comprises an oscillation module, for regulating frequency of oscillation, its distance of reaction being increased, responding to sensitiveer.
Another object of the present invention is to provide a kind of inductance approach switch, it comprises a frequency adjustment module, for regulating frequency of oscillation, obtains the frequency of oscillation of the sensitive surface of mating unlike material.
Another object of the present invention is to provide a kind of inductance approach switch, it comprises the inductive layer of a metal, and this frequency adjustment module obtains the frequency of oscillation matched with the material of this metal inductive layer and thickness, reduces inductive layer for the interference detecting induction process.
Another object of the present invention is to provide a kind of inductance approach switch, it comprises integrated metal inductive layer, this frequency adjustment module obtains the induction frequencies matched with this metal inductive layer, reduces the interference of metal inductive layer for the induction process of detection metal, responds to sensitiveer.
Another object of the present invention is to provide a kind of inductance approach switch, it comprises one and has certain thickness metal inductive layer, frequency adjustment module obtains the frequency of oscillation matched with this sensitive surface material and sensitive surface thickness, make sensitive surface have the performance of higher fluid-resistant high pressure, there is certain effective distance of reaction simultaneously.
Another object of the present invention is to provide a kind of inductance approach switch, it comprises integrated certain thickness stainless steel sensor layer, structure has good barotolerance, frequency adjustment reaches certain interval, make oscillating electromagnetic wave pass stainless performance optimization, thus ensure effective distance of reaction.
Another object of the present invention is to provide a kind of inductance approach switch; it comprises an output protection module; this output protection module adopts self-locking type protection; improve the interference in environment for use of this inductance approach switch; improve interference free performance, optimize electromagnetic compatibility (EMC) performance.
Another object of the present invention is to provide a kind of inductance approach switch, it comprises power module, and this power module comprises a voltage stabilizing element, and improve the anti-lightning surge impact performance of power supply, protective circuit device is from surge impact.
In order to realize above goal of the invention, the invention provides a kind of inductance approach switch, comprising a housing unit; One circuit arrangement, it is inner that this internal circuit is positioned at this housing unit; One Connection Element, this Connection Element is electrically connected on this internal circuit device, for internal circuit is connected to external device (ED);
This housing unit comprises an inductive layer, with an encapsulating shell, this inductive layer is connected to this encapsulating shell one end, in the process detecting metal parts, this inductive layer is relative with detection metal parts, this internal circuit device produces oscillating magnetic field, when detected metal parts is close to this oscillating magnetic field, and inner generation eddy current, oscillating magnetic field is weakened, until failure of oscillation, this circuit arrangement changes this magnetic signal into the signal of telecommunication, is passed to external device (ED); This circuit arrangement comprises a power module, an oscillation module, a signal processing module, and an output protection module, and this power module is used for being connected to external power source, for circuit arrangement provides working power, and burning voltage; This oscillation module, for generation of oscillating magnetic field, provides magnetic signal, and this oscillation module is electrically connected on signal processing module; This signal processing module is used for changing the magnetic signal that this oscillation module produces into the signal of telecommunication, and by signal transacting, is passed to output protection module; This signal output module is used for being connected to external equipment, by the electrical signal transfer of acquisition to external equipment, controls the operating state of external equipment.
Accompanying drawing explanation
Fig. 1 is overall perspective view according to a preferred embodiment of the present invention.
Fig. 2 is explosive view according to a preferred embodiment of the present invention.
Fig. 3 is cutaway view according to a preferred embodiment of the present invention.
Fig. 4 is circuit module figure according to a preferred embodiment of the present invention.
Fig. 5 is overall perspective view according to another preferred embodiment of the invention.
Fig. 6 is explosive view according to another preferred embodiment of the invention.
Fig. 7 is phantom according to another preferred embodiment of the invention, for illustration of inductive layer.
Fig. 8 is the cutaway view of Connection Element according to another preferred embodiment of the invention.
Fig. 9 is axial cutaway view according to another preferred embodiment of the invention.
Figure 10 is circuit module figure according to another preferred embodiment of the invention.
Figure 11 is circuit diagram according to another preferred embodiment of the invention.
Figure 12 is different induction process schematic diagrames according to another preferred embodiment of the invention.
embodiment
Below describe and realize the present invention for disclosing the present invention to enable those skilled in the art.Preferred embodiment in below describing only as an example, it may occur to persons skilled in the art that other apparent modification.The general principle of the present invention defined in the following description can be applied to other embodiments, deformation program, improvement project, equivalent and not deviate from the other technologies scheme of the spirit and scope of the present invention.
With reference to Fig. 1, Fig. 2 is inductance approach switch according to a preferred embodiment of the present invention, comprise a housing unit 10, one circuit arrangement 20, with a Connection Element 30, this circuit arrangement 20 is positioned at this housing unit 10, this housing unit 10 is for the protection of internal circuit, internal circuit is prevented to be subject to mechanical damage, prevent this circuit arrangement 20 of external equipment electromagnetic interference simultaneously, this Connection Element 30 is electrically connected on this circuit arrangement 20, for being connected to external equipment, this circuit arrangement 20 is for generation of electromagnetic signal, electromagnetic signal is changed into the action that switching variable controls external equipment simultaneously.
In the process detecting metal parts, this circuit arrangement produces oscillating magnetic field, electromagnetic signal is provided, through this housing unit 10, being detected metal parts detection faces position to the distance definition of this housing unit 10 lateral surface when external equipment just being received actuating signal is distance of reaction S, detected metal parts M is inner after reaching distance of reaction S produces eddy current, absorb the energy of oscillating magnetic field, make oscillations, until failure of oscillation, the change of electromagnetic signal is carried out process and is changed the signal of telecommunication into by this circuit arrangement 20, exports external equipment to by Connection Element 30.
This housing unit 10 comprises inductive layer 11, encapsulating housing 12, and at least one retaining element 13, this inductive layer 11 is connected to this encapsulating housing 12, it is outside that this retaining element 13 is connected to this encapsulating housing 12, for operating in fixation procedure, is suitable for the instruments such as spanner.In the process detecting metal parts, detected metal parts M is relative with this inductive layer 11 position, when the distance of detected metal parts M and this inductive layer 11 arrives distance of reaction S, detected metal M inside produces eddy current, act on this circuit arrangement 20 oscillating magnetic field, that is metal parts M is detected.
According to a preferred embodiment of the invention, this inductive layer 11 is fixedly connected on this encapsulating housing 12 by structure glue or other sticky object, according to different needs, inductive layer can be positioned at one end or the side of this encapsulating housing 12, this inductive layer 11 adopts pottery or plastic material to form, and this encapsulating housing 12 can adopt metal, stainless steel, or ABS resin is formed, and selects different materials according to different applying working condition.
Further, this encapsulating housing 12 forms the cylindrical structural of a hollow, this inductive layer 11 is connected to one end of this cylindrical structural, this Connection Element 30 is connected to the other end of this cylindrical structure, it is inner that this circuit arrangement 20 is packaged in this cylindrical structural, and in the process detecting metal parts, detected metal parts M and circuit arrangement 20 are positioned at the both sides of this inductive layer 11, when this metal parts M to this inductive layer 11 lateral surface distance arrive distance of reaction S time, metal parts be detected.
This encapsulating housing 12 comprises two fixed parts, the first, second fixed part 121,122 respectively, this first fixed part 121 is for providing installation site, that is, when installing this inductance approach switch, this first fixed part 121 position is installed on, this the first fixed part has the helicitic texture of certain length, be suitable for fixing, freely can adjust on the helicitic texture of encapsulating housing 12 during installation, to guarantee suitable distance of reaction S.
Further, the second fixed part 122, for the connection of reinforce the connection element 30 and external equipment, prevents loosening of connector or aviation plug.
This retaining element 13 forms a polygon-prism structure, be suitable for operating in installation process, that is, in installation process, the erecting tools such as spanner act on this retaining element 13, adjust the installation site of this first fixed part 121, to determine suitable distance of reaction S, this retaining element 13 is made up of metal material.
This housing unit 10 also comprises a packing ring 14, this packing ring 14 is placed between this encapsulating housing 12 and this retaining element 13 separably, to guarantee the sealing function between this unit 10 and apparatus internal high pressure fluid, ensure that the high-pressure fluid that its operational environment exists can not leak, ensure under this particular surroundings not perishable and aging.This packing ring 14 forms a loop configuration and is surrounded on this encapsulating housing 12 outside, and be supported in inside this retaining element 13, this packing ring 14 is made up of quality of rubber materials, and to guarantee certain elasticity and sealing effectiveness, more specifically, this packing ring 14 is made up of nitrile rubber or fluorubber.
This Connection Element 30 comprises a connection shell 31 and several contact pin 32, each contact pin 32 is fixedly connected on and connects shell 31, this connection shell 31 is removably connected to one end of this encapsulating housing 12, each contact pin is connected to this circuit arrangement 20, and that is, several contact pin the inner is connected with this circuit arrangement 20, outer end is used for being connected to external device (ED), such as connect external power source, control device etc., by electrical signal transfer in external device (ED).
According to a preferred embodiment of the invention, the connection shell 31 of this Connection Element 30 is made up of nylon material PA66 or engineering plastic PC, has good insulation property, and each contact pin is made up of brass 62 gilding, guarantees the stability of signal transmission.
The convenient plug of this Connection Element 30, make the connection of this inductance approach switch easier, remove the complex work of wiring process from, this Connection Element 30 also can be the aviation plug of suitable types, circuit is connected convenient, stable.
With reference to the axial cutaway view that Fig. 3 is this inductance approach switch according to one preferred embodiment of the present invention; this circuit arrangement 20 is arranged on a circuit board 201; be installed on this housing unit encapsulating housing 12 inner; this circuit arrangement 20 comprises a power module 21; one oscillation module 22; one signal processing module 23, and an output protection module 24.
When the Connection Element 30 of this inductance approach switch is connected to external device (ED), this power module 21 is for providing the working power of this circuit arrangement 20, external power source is changed into the power supply that this circuit arrangement 20 applicable works, this power module 21 is electrically connected on this oscillation module 22, this signal processing module 23 and this output protection module 24, that is, this inductance approach switch in the course of the work, this circuit arrangement 20 obtains working power by this Connection Element 30, and then external power source is changed into the power supply being suitable for this circuit arrangement 20 and working, this power module 21 has pressure stabilization function simultaneously, to ensure the work of this circuit arrangement 20 normal table.
For common power module, the power supply of this circuit arrangement steady operation can be provided in usual operational environment, when producing some Mutagens, can not well ensure circuit arrangement steady operation, such as in outdoor complex environment, poor for anti-lightning surge capability, according to a preferred embodiment of the invention, this power module 21 has a voltage stabilizing element 211, when power module 21 stands high energy impact events, this voltage stabilizing element 211 can make its impedance suddenly reduce with high speed (be up to 1*10-12 second), simultaneously stability big current, voltage clamp between its two ends is numerically predetermined at one, thus guarantee that circuit element below damages from the high-octane impact of transient state.That is, this voltage stabilizing element 211 improves the voltage regulation performance of this power module, makes this inductance approach switch have the electric property of better anti-thunder surge impact, is suitable for outdoor work, makes its scope of application wider.
A nearlyer step; this voltage stabilizing element 211 is a transient voltage suppressor (TVS); according to the oscillation module 21 of this circuit arrangement 20; signal processing module 22 and the respective operating voltage of output protection module 23; electric current; and the maximum voltage that can bear; electric current; the transient voltage suppressor (TVS) that selection and each circuit module match is installed on this power module; this power module 21 is made to have better voltage regulation performance; protect the oscillation module 21 of this circuit arrangement 20, signal processing module 22 and output protection module 23 are from high-octane impact.
According to a preferred embodiment of the invention, through verification experimental verification, this has the power module 21 of TVS pipe, and the moment lightning surge that can bear 2kV impacts, and protects circuit arrangement 20 injury-free, improves the useful life of this inductance approach switch.
It is the circuit arrangement module map preferably implemented according to the present invention one with reference to Fig. 4, this oscillation module 22 is for providing the electromagnetic signal of vibration, this oscillation module 22 comprises oscillator coil 221 and an oscillating circuit 222, this oscillator coil 221 is electrically connected on this oscillating circuit 222, this oscillator coil 221 is connected to the end of this circuit board 201, relative with the inductive layer 11 of this housing unit 10, that is, when detecting metal parts, this detection metal parts M and this oscillator coil 221 are positioned at the both sides of this inductive layer 11, the oscillating electromagnetic wave signal demand that this oscillator coil 221 produces is through this inductive layer 11, respond to detection metal, when metal detection parts arrive distance of reaction S, metal detection components interior produces eddy current, absorb the energy that oscillating magnetic field produces, make oscillations, this signal processing module 22 by the change of electromagnetic signal by detecting circuit 231, amplifying circuit 232, with shaping circuit 233, electromagnetic signal is amplified, process, change the signal of telecommunication into, be passed to output protection module 24, the switching variable that signal is changed into corresponding control by this output protection module exports, corresponding external control device is passed to by Connection Element 30.
According to a preferred embodiment of the invention, the oscillating electromagnetic wave that this oscillator coil 221 produces worked in coordination with by this oscillating circuit 222, first will through the inductive layer 11 oscillator coil 222 and detected metal parts M, respond to detection metal M again, and electromagnetic frequency of oscillation affects electromagnetic wave through this inductive layer 11 transmitance, and determine distance of reaction S through the electromagnetic wave of inductive layer 11, that is, modulate suitable frequency of oscillation, most important for the distance of reaction detecting metal parts.
, between electric capacity C and frequency f, there is following relation in inductance L in oscillating circuit:
And the number of turn n of inductance L size and oscillator coil 222, the relation between the variablees such as the diameter D of oscillator coil 222 is relevant, and therefore, obtain suitable frequency of oscillation f needs to coordinate the number of turn of oscillator coil, the electric capacity C in the diameter D of oscillator coil and oscillating circuit.
According to a preferred embodiment of the invention, the inductance L in regulating circuit device, this inductance L and magnetic core, coil relationship are as follows:
L＝μW
2A/L
A: be the sectional area of magnetic core, L: the magnetic circuit average length of magnetic core, W: coil turn, μ: magnetic permeability.
This signal processing module 23 is electrically connected on this oscillation module 22; the electromagnetic signal that this oscillation module produces; and the change of the electromagnetic signal caused in testing process; be passed to this signal processing module 23; the information received is carried out amplification process by this signal processing module 23; change the signal of telecommunication of switching value into, be passed to output protection module 24.
This output protection module 24 is electrically connected on this signal processing module 23; the information that this output protection module 24 is transmitted for receiving this signal processing module; be converted into control information to export, control information is passed to corresponding external control devices by Connection Element 30.
Traditional inductance approach switch adopts pulsed short-circuit protection, makes its Electro Magnetic Compatibility poor, and according to a preferred embodiment of the invention, this output protection adopts self-locking type short-circuit protection, makes overall Electro Magnetic Compatibility optimization.
With reference to Fig. 5, Fig. 6 is according to another preferred embodiment of the invention, one inductance approach switch, comprise a housing unit 10', one circuit arrangement 20', with a Connection Element 30', this circuit arrangement 20' is positioned at this housing unit 10', this housing unit 10' is for the protection of internal circuit, internal circuit is prevented to be subject to mechanical damage, prevent this circuit arrangement of electromagnetic interference 20' in external environment simultaneously, this Connection Element 30' is electrically connected on this circuit arrangement 20', for being connected to external equipment, this circuit arrangement 20' is for generation of electromagnetic signal, electromagnetic signal is changed into the action that switching variable controls external equipment simultaneously.
In the process detecting metal parts, this circuit arrangement 20' produces oscillating magnetic field, electromagnetic signal is provided, electromagnetic signal is through this housing unit 10', being detected metal parts detection faces position to the distance definition of this housing unit lateral surface when external equipment just being received actuating signal is distance of reaction S, detected metal parts M reaches inductive electromagnetic signal after distance of reaction S, inner generation eddy current, absorb the energy of oscillating magnetic field, make oscillations, until failure of oscillation, the change of electromagnetic signal is carried out process and is changed the signal of telecommunication into by this circuit arrangement 20', external equipment is exported to by Connection Element 30'.
This housing unit 10' comprises an inductive layer 11', an encapsulating housing 12', and at least one retaining element 13', this inductive layer 11' is connected to this encapsulating housing 12', it is outside that this retaining element 13' is connected to this encapsulating housing 12', for operating in fixation procedure, is suitable for the instruments such as spanner.In the process detecting metal parts M, detected metal parts M is relative with this inductive layer 11' position, when the distance of detected metal parts M and this inductive layer 11' arrives distance of reaction S, detected metal M inside produces eddy current, act on this circuit arrangement 20' oscillating magnetic field, that is metal parts M is detected.
Phantom according to a preferred embodiment of the invention with reference to Fig. 7, this inductive layer 11' is connected to this encapsulating housing 12' one-body moldedly, according to different needs, this inductive layer 11' can be positioned at one end or the side of this encapsulating housing 12', according to one preferred embodiment of the present invention, this inductive layer 11' adopts metal stainless steel to form, this inductive layer 11' has certain thickness H, this thickness reaches 1.5mm, this housing unit 10' is made to have the performance of better fluid-resistant high pressure, through verification experimental verification, when the thickness of inductive layer 11' reaches 1.5mm, this inductive layer 11' tolerates the surge of 600bar fluid environment, relative to the fluid high-pressure bearing 500bar in prior art, the fluid-resistant high-voltage performance of this inductive layer 11' significantly improves.
Further, this encapsulating housing 12' forms the cylindrical structural of a hollow, this inductive layer 11' is connected to one end of this cylindrical structural, this Connection Element 30' is connected to the other end of this cylindrical structure, it is inner that this circuit arrangement 20' is packaged in this cylindrical structural, in the process detecting metal parts, detected metal parts M and circuit arrangement 20' is positioned at the both sides of this inductive layer 11', when the distance of this metal parts M to this inductive layer 11' lateral surface arrives distance of reaction S, metal parts is detected, that is, the oscillating electromagnetic wave that this circuit arrangement 20' produces can detect metal parts M through the inductive layer 11' that 1.5mm is thick.
This encapsulating housing 12 ' comprises two fixed parts, the first, second fixed part 121 ', 122 ' respectively, this first fixed part 121 ' is for providing installation site, that is, when installing this inductance approach switch, this first fixed part 121 ' position is installed on, this the first fixed part has the helicitic texture of certain length, be suitable for fixing, freely can adjust on the helicitic texture of encapsulating housing 12 ' during installation, to guarantee suitable distance of reaction S.
Further, the second fixed part 122 ', for the connection of reinforce the connection element 30 ' and external equipment, prevents loosening of connector or aviation plug.
This retaining element 13' forms a polygon-prism structure, be suitable for operating in installation process, that is, in installation process, the erecting tools such as spanner act on this retaining element 13', adjust the installation site of this first fixed part 121' or the second fixed part 122', to determine suitable distance of reaction S, this retaining element 13' is made up of metal material, and further, this retaining element 13' can be made up of the stainless steel identical with this encapsulating housing 12' material.
This housing unit 10' also comprises a packing ring 14', this packing ring 14' is placed between this encapsulating housing 12' and this retaining element 13' separably, to guarantee the sealing function between this unit 10' and apparatus internal high pressure fluid, ensure that the high-pressure fluid that its operational environment exists can not leak, ensure under this particular surroundings not perishable and aging.This packing ring 14' forms a loop configuration and is surrounded on this encapsulating housing 12' outside, be supported in inside this retaining element 13', this packing ring 14' is made up of quality of rubber materials, to guarantee certain elasticity and sealing effectiveness, more specifically, this packing ring 14' is made up of nitrile rubber or fluorubber.
With reference to the cutaway view that Fig. 8 is Connection Element according to another preferred embodiment of the invention, this Connection Element 30' comprises a connection shell 31' and several contact pin 32', each contact pin 32' is fixedly connected on this connection shell 31', this connection shell 31' is removably connected to one end of this encapsulating housing 12, each contact pin is electrically connected on this circuit arrangement 20', that is, several contact pin 32' the inner is connected with this circuit arrangement 20', outer end is used for being connected to external device (ED), such as connect external power source, control device etc., by electrical signal transfer in external device (ED).
According to a preferred embodiment of the invention, the connection shell 31' of this Connection Element 30' is made up of nylon material PA66 or engineering plastic PC, has good insulation property, and each contact pin is made up of brass H62 gilding, to guarantee the stability of signal transmission.
The convenient plug of this Connection Element 30', make the connection of this inductance approach switch easier, remove the complex work of wiring process from, this Connection Element 30' also can be the aviation plug of suitable types, circuit is connected convenient, stable.
With reference to the axial cutaway view that Fig. 9 is this inductance approach switch according to one preferred embodiment of the present invention; this circuit arrangement 20' is arranged on a circuit board 201'; the 10' encapsulating housing 12' being installed on this housing unit is inner; this circuit arrangement 20' comprises a power module 21'; one oscillation module 22'; one signal processing module 23', and an output protection module 24'.
When the Connection Element 30' of this inductance approach switch is connected to external device (ED), this power module 21' is for providing the working power of this circuit arrangement 20', external power source is changed into the power supply that applicable this circuit arrangement 20' works, this power module 21' is electrically connected on this oscillation module 22', this signal processing module 23' and this output protection module 24', that is, this inductance approach switch in the course of the work, this circuit arrangement 20' obtains working power by this Connection Element 30, and then external power source is changed into the power supply being suitable for this circuit arrangement 20' and working, this power module 21' has pressure stabilization function simultaneously, to ensure the work of this circuit arrangement 20' normal table.
For common power module, the power supply of this circuit arrangement steady operation can be provided in usual operational environment, when producing some Mutagens, can not well ensure circuit arrangement steady operation, such as in outdoor complex environment, poor for anti-lightning surge capability, according to a preferred embodiment of the invention, this power module 21' comprises a voltage stabilizing element 211', when power module 21' stands high energy impact events, this voltage stabilizing element 211' can make its impedance suddenly reduce with high speed (be up to 1*10-12 second), simultaneously stability big current, voltage clamp between its two ends is numerically predetermined at one, thus guarantee that circuit element below damages from the high-octane impact of transient state.That is, this voltage stabilizing element 211' improves the voltage regulation performance of this power module 21', makes this inductance approach switch have the electric property of better anti-thunder surge impact, is suitable for outdoor work, makes its scope of application wider.
A nearlyer step, this voltage stabilizing element 211' is a transient voltage suppressor (TVS), according to the oscillation module 21 of this circuit arrangement 20', the operating voltage that this signal processing module 22' is respective with this output protection module 23, electric current, and the maximum voltage that can bear, electric current, the transient voltage suppressor (TVS) that selection and each circuit module match is installed on this power module 21', this power module 21' is made to have better voltage regulation performance, protect the oscillation module 21' of this circuit arrangement 20', signal processing module 22' and output protection module 23' is from high-octane impact.
According to a preferred embodiment of the invention; through verification experimental verification, this has the power module 21' of TVS pipe, and the moment lightning surge that can bear 2kV impacts; protect circuit arrangement 20' injury-free under surge impact, improve the useful life of this inductance approach switch.
Be circuit arrangement module map according to another preferred embodiment of the invention and Figure 11 with reference to Figure 10 be corresponding circuit diagram, this oscillation module 22' is for providing the electromagnetic signal of vibration, this oscillation module 22' comprises an an oscillator coil 221' and oscillating circuit 222', this oscillator coil 221' is electrically connected on this oscillating circuit 222', this oscillator coil 221' is connected to the end of this circuit board 201', relative with the inductive layer 11' of this housing unit 10', this signal processing module 23 comprises a detecting circuit 231, one amplifying circuit 232, one shaping circuit 233, that is, when detecting metal parts, this detection metal parts M and this oscillator coil 221' is positioned at the both sides of this inductive layer 11', the oscillating electromagnetic wave signal demand that this oscillator coil 221' produces is responded to detection metal through having certain thickness this inductive layer 11', when metal detection parts arrive distance of reaction S, metal detection components interior produces eddy current, absorb the energy that oscillating magnetic field produces, make oscillations, this signal processing module 22 by the change of electromagnetic signal by detecting circuit 231', amplifying circuit 232', shaping circuit 233' amplifies, process, change the signal of telecommunication into, be passed to the output circuit 241' of output protection module 24', the switching variable that signal is changed into corresponding control by this output protection module 24' exports, corresponding external control device is passed to by Connection Element 30'.
With reference to the different-thickness that Figure 12 is according to another preferred embodiment of the present invention, the induction process schematic diagram of different frequency, according to a preferred embodiment of the invention, this oscillating circuit 222' works in coordination with the oscillating electromagnetic wave that this oscillator coil 221' produces, first will through the inductive layer 11' oscillator coil 222' and detected metal parts M, respond to detection metal M again, and electromagnetic frequency of oscillation affects electromagnetic wave through this inductive layer 11' transmitance, and determine distance of reaction S through the electromagnetic wave of inductive layer 11', that is, modulate suitable frequency of oscillation f, most important for the distance of reaction detecting metal parts.
, between electric capacity C and frequency f, there is following relation in inductance L in oscillating circuit:
And the number of turn n of inductance L size and oscillator coil 222', the diameter D of oscillator coil 222' is relevant, therefore, the number of turn that suitable frequency of oscillation f needs to coordinate oscillator coil 222' be obtained, the relation between the variablees such as the electric capacity C in the diameter D of oscillator coil 222' and oscillating circuit.
In addition, electromagnetic wave is also relevant with the thickness of inductive layer 11' through the transmitance of inductive layer 11', when the thickness of inductive layer is relatively little, on different frequency electromagnetic through impact less, and when this inductive layer 11' thickness increases, the electromagnetic wave of different frequency weakens all to some extent, but the influence degree of different frequency is different, when reaching certain thickness, such as during 1.5mm, frequency electromagnetic waves is not completely by this stainless steel sensor layer 11', that is, there is no effective distance of reaction S, therefore, the thickness H of this inductive layer 11' will be coordinated in this oscillation module 22', frequency of oscillation f, relation between distance of reaction S.
Preferably implement according to of the present invention one, this inductive layer 11' is the stainless steel that 1.5mm is thick, regulates the inductance L in this oscillation module 22', electric capacity C, the number of turn of oscillator coil 222' and diameter D, when frequency of oscillation f is reached between 20k to 30k, distance of reaction S reaches 3mm, that is, the stainless steel sensor layer 11' thickness of this integral type increases, and makes the performance enhancement of fluid-resistant high pressure, simultaneously, the adjustment of oscillation module 22' medium frequency f, makes it have certain distance of reaction S.
In other words, according to a preferred embodiment of the invention, this inductive layer 11' is integrated is connected to this encapsulating housing 12', be made up of stainless steel, when thickness reaches 1.5mm, when frequency of oscillation is between 2k to 3k, the oscillating electromagnetic wave that this oscillator coil 222' produces can detect metal parts through this inductive layer 11', and distance of reaction reaches 3mm.
This signal processing module 23' is electrically connected on this oscillation module 22'; the electromagnetic signal that this oscillation module 22' produces; and the change of the electromagnetic signal caused in testing process; be passed to this signal processing module 23'; the information received is carried out amplification process by this signal processing module 23'; change the signal of telecommunication of switching value into, be passed to output protection module 24'.
This output protection module 24' is electrically connected on this signal processing module 23'; the information that this output protection module 24' transmits for receiving this signal processing module; be converted into control information to export, control information is passed to corresponding external control devices by Connection Element 13'.
Traditional inductance approach switch adopts pulsed short-circuit protection, makes its Electro Magnetic Compatibility poor, and according to a preferred embodiment of the invention, this output protection adopts self-locking type short-circuit protection, makes overall Electro Magnetic Compatibility optimization.Test proof, burst of pulses interference (EFT), conducted interference (CS), the EMC indexs such as radiated interference (CE/RE) have reached EN60947-5-2 related request all.
One skilled in the art will understand that the embodiments of the invention shown in foregoing description and accompanying drawing only limit the present invention as an example and not.Object of the present invention is complete and effectively realize.Function of the present invention and structural principle are shown in an embodiment and are illustrated, do not deviating under described principle, embodiments of the present invention can have any distortion or amendment.
Claims (15)
1. an inductance approach switch, for detecting a metal parts, is characterized in that, comprising
One housing unit, described housing unit comprises an inductive layer and an encapsulating housing, and described inductive layer is connected to described encapsulating housing;
One circuit arrangement, it is inner that described circuit arrangement is positioned at described encapsulating housing, described circuit arrangement comprises an oscillation module, one signal processing module, with an output protection module, in the process detecting metal parts, tested metal parts enters induction, oscillating magnetic field is weakened, described oscillation module produces oscillating electromagnetic signal, and signal processing module receiving electromagnetic signals, is treated to controllable switching signal by electromagnetic signal, described output protection module receives the control signal that described signal processing module transmits, and control signal is exported; With a Connection Element, described Connection Element is connected to described circuit arrangement, and the information that described output protection module exports is passed to external control devices by described Connection Element;
Wherein, described oscillation module comprises an oscillator coil and an oscillating circuit, and described oscillator coil is electrically connected on described oscillating circuit, for generation of the low frequency electromagnetic signals of certain limit, to obtain certain distance of reaction.
2. inductance approach switch as claimed in claim 1, it is characterized in that, described inductive layer is connected to described encapsulating housing one-body moldedly.
3. inductance approach switch as claimed in claim 2, is characterized in that, described inductive layer material adopts stainless steel.
4. inductance approach switch as described in claim 1 or 3, is characterized in that, the surge frequency range that described oscillation module produces is 20k to 30k.
5. inductance approach switch as claimed in claim 4, it is characterized in that, described inductive layer thickness reaches 1.5mm, obtains distance of reaction and reaches 3mm.
6. inductance approach switch as claimed in claim 1, is characterized in that, described encapsulating housing adopts Stainless Steel material to form.
7. inductance approach switch as described in claim 1 or 5, is characterized in that, described encapsulating housing comprises at least one fixed part, and described fixed part forms helicitic texture, for regulating distance of reaction.
8. inductance approach switch as claimed in claim 7, it is characterized in that, described encapsulating housing comprises at least one retaining element, and described retaining element forms a polygonized structure, provides tool operation location.
9. inductance approach switch as claimed in claim 7, it is characterized in that, described Connection Element is removably connected to described encapsulating housing.
10. inductance approach switch as claimed in claim 7, it is characterized in that, described Connection Element comprises a connection shell and several contact pin, and each contact pin is fixedly connected to enclosure interior circuit arrangement.
11. inductance approach switches as claimed in claim 10, is characterized in that, described connection shell adopts nylon material or engineering plastics to make.
12. inductance approach switches as claimed in claim 11, is characterized in that, described contact pin adopts brass gilding to make.
13. 1 kinds of inductance approach switches, for detecting a metal parts, is characterized in that, comprising:
One housing unit, described housing unit comprises an inductive layer and an encapsulating housing, and described inductive layer is connected to described encapsulating housing;
One circuit arrangement, described circuit arrangement is positioned at described encapsulating housing; Wherein, described circuit arrangement comprises an oscillation module, a signal processing module, and an output protection module, in the process detecting metal parts, tested metal parts enters induction zone, and oscillating magnetic field weakens, and described oscillation module produces oscillating electromagnetic signal, signal processing module receiving electromagnetic signals, electromagnetic signal is treated to controllable switching signal, and described output protection module receives the switching signal that described signal processing module transmits, and control signal is exported; Wherein said output protection module adopts self-locking type output protection.
14. 1 kinds of inductance approach switches, is characterized in that, comprising:
One housing unit, described housing unit comprises an inductive layer and an encapsulating housing, and described inductive layer is connected to described encapsulating housing;
One circuit arrangement, described circuit arrangement is positioned at described encapsulating housing; Wherein, described circuit arrangement comprises a power module, for external power source being changed into the power supply being suitable for described circuit arrangement works; One oscillation module, for generation of oscillating electromagnetic signal; One signal processing module, for the treatment of the electromagnetic signal that described oscillation module transmits, and an output protection module, export for the switching signal that signal processing module is transmitted; Wherein, described power module comprises a voltage stabilizing element, makes power module can bear certain voltage and impacts.
15. inductance approach switches as claimed in claim 14, it is characterized in that, described voltage stabilizing element is a transient voltage suppressor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410412514.8A CN104300957A (en) | 2014-08-20 | 2014-08-20 | High voltage resistant inductance approach switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410412514.8A CN104300957A (en) | 2014-08-20 | 2014-08-20 | High voltage resistant inductance approach switch |
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| CN104300957A true CN104300957A (en) | 2015-01-21 |
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| CN201410412514.8A Pending CN104300957A (en) | 2014-08-20 | 2014-08-20 | High voltage resistant inductance approach switch |
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| CN104901671A (en) * | 2015-05-08 | 2015-09-09 | 大唐宝鸡热电厂 | Inductance approach switch |
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