CN109412571B - Industrial control contactless electronic explosion-proof switch - Google Patents

Industrial control contactless electronic explosion-proof switch Download PDF

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Publication number
CN109412571B
CN109412571B CN201811629797.6A CN201811629797A CN109412571B CN 109412571 B CN109412571 B CN 109412571B CN 201811629797 A CN201811629797 A CN 201811629797A CN 109412571 B CN109412571 B CN 109412571B
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Prior art keywords
switch
pin
filter capacitor
voltage
shell
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CN201811629797.6A
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CN109412571A (en
Inventor
李喜通
郭为民
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Henan Fukesi Environmental Protection Technology Co ltd
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Henan Fukesi Environmental Protection Technology Co ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/90—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of galvano-magnetic devices, e.g. Hall-effect devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K2017/0806—Modifications for protecting switching circuit against overcurrent or overvoltage against excessive temperature
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/0081—Power supply means, e.g. to the switch driver
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/96015—Constructional details for touch switches

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  • Switch Cases, Indication, And Locking (AREA)

Abstract

The utility model provides an industrial control contactless electronic explosion-proof switch, which comprises a switch shell, soft silicon rubber keys, magnetic steel and a Hall switch circuit board; the Hall switch circuit board is arranged in the switch shell and is used for installing a Hall switch and other electronic components; the switch shell is provided with a round hole corresponding to the Hall switch, the end part of the soft silicon rubber key is inlaid with the magnetic steel, the magnetic steel is inserted into the round hole, and the distance between the magnetic steel and the Hall switch is changed through the pressing and restoring actions of the soft silicon rubber key. The utility model uses the non-contact mode composed of the Hall switch, the soft silicon rubber key and the magnetic steel to trigger the switch to be turned on and off, replaces the spring structure in the common button by the soft deformation characteristic of the soft silicon rubber key material, and the front part of the switch is not communicated with the inside of the switch, so the whole switch has simple structure, reliable work and stable action.

Description

Industrial control contactless electronic explosion-proof switch
Technical Field
The utility model relates to an explosion-proof switch, in particular to an industrial control contactless electronic explosion-proof switch which can be widely used for controlling electric appliances in severe environments, such as petroleum and petrochemical industry, papermaking, chemical industry, sewage and sludge treatment, textile, printing and dyeing, brewing, medicine, mines, explosion-proof gas environments, flammable dust environments and other places with explosion-proof requirements on the electric switch.
Background
Currently, electronic switches are widely used, and great convenience is brought to people's work and life. The electronic contactless switch has the main characteristics of no movable contact part, no electric arc or spark during on and off, quick action, long service life and high reliability, and is suitable for special environments such as fire prevention, explosion prevention, moisture prevention, corrosion prevention and the like. However, the existing electronic switch also has limitations such as:
chinese patent publication No. 2107736U discloses a 'non-contact explosion-proof switch', which is formed by connecting a reed pipe between a control pole G and an anode A of an alternating current controllable silicon through a current limiting resistor, driving a permanent magnet to change positions through a penetrating rod by a rotary button, and controlling the contact and separation of the reed pipe to control the on-off of the bidirectional controllable silicon, so that a switch loop is switched on or switched on, and no spark is generated when the switch is switched on or off. The utility model has the characteristics of simple process and low cost, but the reed pipe is a contact switch, the glass shell of the reed pipe is easy to break, when the glass shell of the reed pipe breaks, the switch is damaged or can not be used as an explosion-proof switch, and the reed pipe has the defect of poor reliability.
The Chinese patent publication No. CN2565202Y discloses an utility model patent of a zero-voltage contactless explosion-proof switch, which consists of a semiconductor device pressure sensor, a limiting circuit, a voltage follower, a comparator, a trigger, a coupler, a zero-crossing detection circuit and a power electronic element, wherein the voltage signal is output by the voltage follower through pressing piezoelectric ceramics, and the signal voltage is limited to be within 0.7V through the limiting circuit so as to trigger the switch to be opened and closed, thereby realizing the contactless control of a control loop and a load loop. The utility model adopts pressure signal triggering to solve the defect that mechanical contact points still exist in a control circuit, but has the defect that the circuit is easy to produce false triggering, because the piezoelectric ceramics have very sensitive characteristics, sound waves and weak mechanical vibration can be converted into electric signals, and the amplitude of signals produced by thunder, vehicle noise and ground vibration can make a comparator of the circuit indistinct and true, so that the switch is easy to be interfered to cause false opening or false closing.
The utility model patent of Chinese patent publication No. CN103066979B discloses a solid explosion-proof switch, which adopts an electronic component and a solid explosion-proof switch, and relates to an electronic explosion-proof switch, mainly comprising a light control component, a button and a circuit board, wherein the light control component and a button slide bar are used for operating a light control signal to trigger the switch to be turned on and off, and a silicon controlled rectifier of 1A is used as the on-off of a lamp load, so that the control loop and the load loop are in contactless connection or disconnection, and epoxy resin is adopted for packaging the circuit board and the component, so that the switch has a certain explosion-proof and waterproof function, but has the defects that the low-power silicon controlled rectifier is adopted, the load capacity is poor, the heating life is short; the circuit part adopts a non-isolated capacitor step-down power supply, the main step-down capacitor has the problems of capacitance attenuation and aging, and external power supply interference signals are easily connected in series to influence the stability of the circuit; the electrolytic capacitor is adopted as power supply filtering, so that the problems of large leakage current, easy aging and short service life exist due to the liquid electrolyte; the circuit board and the components are encapsulated by epoxy resin, and if the switch fails, the switch is difficult to maintain; the epoxy resin packaging still has the problem of filling and sealing air holes, and the buttons and the light-operated components are adopted and the button sliding rods are not subjected to sealing treatment, so that external moisture and inflammable, explosive, corrosive and other gases enter the epoxy resin filling layer through gaps, and risk potential hazards are caused; the sealing structure design is not made at the wiring terminal, and dangerous hidden danger exists.
In order to solve the above problems, an ideal technical solution is always sought.
Disclosure of Invention
The utility model aims at overcoming the defects of the prior art, thereby providing an industrial control contactless electronic explosion-proof switch.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: an industrial control contactless electronic explosion-proof switch comprises a switch shell, a soft silicon rubber key 9, magnetic steel 8 and a Hall switch circuit board 7;
the Hall switch circuit board 7 is arranged in the switch shell and is used for installing a Hall switch U2 and other electronic components;
the switch shell is provided with a round hole corresponding to the position of the Hall switch U2, the end part of the soft silicon rubber key 9 is inlaid with the magnetic steel 8, the magnetic steel 8 is inserted into the round hole, and the distance between the magnetic steel 8 and the Hall switch U2 is changed through the pressing and restoring actions of the soft silicon rubber key 9.
Based on the above, the electronic components mounted on the hall switch circuit board 7 include an epoxy resin potting transformer T1, a rectifier bridge B1, a filter capacitor C2, a filter capacitor C3, a filter capacitor C4, a filter capacitor C5, a current limiting resistor R1, an electronic switch U1, a hall switch U2, a photovoltaic output optocoupler U3, a low-dropout three-terminal voltage regulator U4, a high-voltage N-channel MOSFET Q1, a high-voltage N-channel MOSFET Q2, and a three-position screw type PCB wiring terminal TP1;
the two wiring terminals of the primary winding of the epoxy resin encapsulated transformer T1 are connected with the three-position screw type PCB wiring terminal TP1, and the two wiring terminals of the secondary winding of the epoxy resin encapsulated transformer T1 are respectively connected with two alternating current input pins of the rectifier bridge B1;
the positive pin of the direct current output end of the rectifier bridge B1 is respectively connected with the filter capacitor C1, one end of the pin of the filter capacitor C2 and the Vin pin of the low-dropout three-terminal voltage regulator U4, and the other ends of the pin of the filter capacitor C1 and the filter capacitor C2 and the negative pin of the direct current output end of the rectifier bridge B1 are connected with a power supply ground end;
the VSS pin of the low-dropout three-terminal voltage regulator U4 is connected with a power supply ground terminal, the Vout pin of the low-dropout three-terminal voltage regulator U4 is respectively connected with the filter capacitor C3, the filter capacitor C4, the Vin pin of the filter capacitor C5 and the Vin pin of the Hall switch U2, the Vin pin of the electronic switch U1 and the one end pin of the current-limiting resistor R1, the other end pins of the filter capacitor C3, the filter capacitor C4 and the filter capacitor C5 are connected with the power supply ground terminal, the VSS pin of the Hall switch U2 and the VSS pin of the electronic switch U1 are connected with the power supply ground terminal, and the OUT pin of the Hall switch U2 is connected with the IN pin of the electronic switch U1;
the other end pin of the current limiting resistor R1 is connected with the positive electrode of the input end of the photovoltaic output optocoupler U3, the negative electrode of the input end of the photovoltaic output optocoupler U3 is connected with the OUT pin of the electronic switch U1, the positive electrode pin of the output end of the photovoltaic output optocoupler U3 is respectively connected with the grid pin of the high-voltage N-channel MOSFET Q1 and the grid pin of the high-voltage N-channel MOSFET Q2, the negative electrode pin of the output end of the photovoltaic output optocoupler U3 is respectively connected with the source pin of the high-voltage N-channel MOSFET Q1 and the source pin of the high-voltage N-channel MOSFET Q2, and the drain pin of the high-voltage N-channel MOSFET Q1 and the drain pin of the high-voltage N-channel MOSFET Q2 are respectively connected with the L pin and the L1 pin of the three-position screw type PCB connecting terminal TP1.
Compared with the prior art, the utility model has outstanding substantive characteristics and remarkable progress, and concretely comprises the following steps:
1. the utility model uses the non-contact mode composed of the Hall switch, the soft silicon rubber key and the magnetic steel to trigger the switch to be turned on and off, and replaces the spring structure in the common button by the soft deformation characteristic of the soft silicon rubber key material, and the front part of the switch is not communicated with the inside of the switch, so the whole switch has simple structure, reliable work and stable action;
2. the electronic components used in the utility model are all solid packaging materials, and the electrolytic capacitor adopted in other common circuits is not used as a power supply filter device, so that the electronic components are high-temperature resistant and long in service life; the high-temperature-resistant fireproof high-insulation epoxy resin potting and An Huanyang resin potting transformer T1 is used for high-low voltage alternating current conversion, so that power insulation and isolation and power grid interference signal isolation are realized, smoke and explosion cannot occur even if unexpected faults occur, and the working stability and the service life are long.
Drawings
Fig. 1 is a schematic diagram of the switch structure of the present utility model.
Fig. 2 is a schematic circuit diagram of the electronic explosion-proof switch of the present utility model.
In the figure: 1. a polytetrafluoroethylene gasket; 2. quartz sand particle filler; 3. a switch rear case; 4. a soft silicone rubber seal ring; 5. an inner hexagonal flat head jackscrew; 6. a wire inlet threaded hole; u2. hall switch; 7. a Hall switch circuit board; 8. magnetic steel; 9. soft silicone rubber keys; 10. a mounting substrate; 11. a switch panel; 12. a switch front case; 13. a metal pin; TP1, three-position screw type PCB binding post; 14. a circuit board; 15, a central cylinder; 16. a circular rim.
Detailed Description
The technical scheme of the utility model is further described in detail through the following specific embodiments.
Example 1
As shown in fig. 1 and 2, an industrial control contactless electronic explosion-proof switch comprises a switch shell, a soft silicon rubber key 9, magnetic steel 8 and a hall switch circuit board 7; the Hall switch circuit board 7 is arranged in the switch shell through a mounting substrate 10 and is used for mounting a Hall switch U2 and other electronic components; the switch shell is provided with a round hole corresponding to the position of the Hall switch U2, the end part of the soft silicon rubber key 9 is inlaid with the magnetic steel 8, the magnetic steel 8 is inserted into the round hole, and the distance between the magnetic steel 8 and the Hall switch U2 is changed through the pressing and restoring actions of the soft silicon rubber key 9.
The electronic components mounted on the Hall switch circuit board 7 comprise an epoxy resin potting transformer T1, a rectifier bridge B1, a filter capacitor C2, a filter capacitor C3, a filter capacitor C4, a filter capacitor C5, a current limiting resistor R1, an electronic switch U1, a Hall switch U2, a photovoltaic output optocoupler U3, a low-dropout three-terminal voltage regulator U4, a high-voltage N-channel MOSFET Q1, a high-voltage N-channel MOSFET Q2 and a three-position screw type PCB wiring terminal TP1;
the two wiring terminals of the primary winding of the epoxy resin encapsulated transformer T1 are connected with the three-position screw type PCB wiring terminal TP1, and the two wiring terminals of the secondary winding of the epoxy resin encapsulated transformer T1 are respectively connected with two alternating current input pins of the rectifier bridge B1;
the positive pin of the direct current output end of the rectifier bridge B1 is respectively connected with the filter capacitor C1, one end of the pin of the filter capacitor C2 and the Vin pin of the low-dropout three-terminal voltage regulator U4, and the other ends of the pin of the filter capacitor C1 and the filter capacitor C2 and the negative pin of the direct current output end of the rectifier bridge B1 are connected with a power supply ground end;
the VSS pin of the low-dropout three-terminal voltage regulator U4 is connected with a power supply ground terminal, the Vout pin of the low-dropout three-terminal voltage regulator U4 is respectively connected with the filter capacitor C3, the filter capacitor C4, the Vin pin of the filter capacitor C5 and the Vin pin of the Hall switch U2, the Vin pin of the electronic switch U1 and the one end pin of the current-limiting resistor R1, the other end pins of the filter capacitor C3, the filter capacitor C4 and the filter capacitor C5 are connected with the power supply ground terminal, the VSS pin of the Hall switch U2 and the VSS pin of the electronic switch U1 are connected with the power supply ground terminal, and the OUT pin of the Hall switch U2 is connected with the IN pin of the electronic switch U1;
the other end pin of the current limiting resistor R1 is connected with the positive electrode of the input end of the photovoltaic output optocoupler U3, the negative electrode of the input end of the photovoltaic output optocoupler U3 is connected with the OUT pin of the electronic switch U1, the positive electrode pin of the output end of the photovoltaic output optocoupler U3 is respectively connected with the grid pin of the high-voltage N-channel MOSFET Q1 and the grid pin of the high-voltage N-channel MOSFET Q2, the negative electrode pin of the output end of the photovoltaic output optocoupler U3 is respectively connected with the source pin of the high-voltage N-channel MOSFET Q1 and the source pin of the high-voltage N-channel MOSFET Q2, and the drain pin of the high-voltage N-channel MOSFET Q1 and the drain pin of the high-voltage N-channel MOSFET Q2 are respectively connected with the L pin and the L1 pin of the three-position screw type PCB connecting terminal TP1.
The circuit principle of the electronic explosion-proof switch is as follows:
the epoxy resin encapsulation transformer T1 converts high-voltage alternating current into safe low-voltage alternating current, and the rectifier bridge B1, the filter capacitor C1 and the filter capacitor C2 form an alternating current-direct current conversion filter circuit; the low-dropout three-terminal voltage regulator U4, the filter capacitor C3, the filter capacitor C4 and the filter capacitor C5 form a direct-current voltage stabilizing circuit which is used as a working power supply for the internal circuit of the switch;
the epoxy resin encapsulated transformer T1 is adopted in the circuit as alternating current-direct current voltage conversion and isolation, so that the serial input of an external high-voltage power supply interference signal can be avoided; the Hall switch U2 is used for realizing non-contact magnetic control operation, and the internal circuit of the Hall switch U2 is designed with a Schmitt trigger circuit to output signals stably and reliably;
when the magnetic induction intensity passing through the Hall switch U2 exceeds the trigger threshold value, the output pin OUT of the Hall switch U2 outputs a falling edge level of which the high level is changed into the low level, the electronic switch U3 is IN a single-ended trigger output level overturning working mode, and when the input pin IN of the electronic switch U3 has a falling edge level change, the output pin OUT level of the electronic switch U3 is overturned, so that the on-off of an LED component at the internal input end of the photovoltaic output optocoupler U3 is controlled, the overturning of the output end level of the photovoltaic output optocoupler U3 is further realized, and the on-off control of a power electronic switch consisting of a high-voltage N-channel MOSFET (metal oxide semiconductor field effect transistor) Q1 and a high-voltage N-channel MOSFET (metal oxide semiconductor field effect transistor) Q2 is realized.
During the working and using period of the switch, if the switch is IN an off state, a soft silicon rubber key 9 is pressed when the switch is required to be opened, so that the magnetic steel 8 embedded at the end part of a central cylinder 15 is nearest to the Hall switch U2, the magnetic induction intensity generated by the magnetic steel is maximum at the moment, the output pin OUT of the Hall switch U2 outputs a falling edge level, the input pin IN of the electronic switch U1 inputs a falling edge level change, the output pin OUT level of the electronic switch U1 is overturned to output suction current, a direct-current low-voltage power supply is connected with a circuit for driving an LED at the inner input end of a photovoltaic output optocoupler U3 through a current limiting resistor R1 to be connected, the output end of the photovoltaic output optocoupler U3 is further driven to output driving current, the power electronic switch consisting of a high-voltage N channel MOSFET Q1 and a high-voltage N channel MOSFET Q2 is turned on, the load is turned on an external power supply, and the soft silicon rubber key 9 is loosened, and the switch is still kept IN an on state;
if the switch needs to be turned off, only the soft silicon rubber key 9 needs to be pressed again, the Hall switch U2 outputs a falling edge level, the electronic switch U1 turns over the output pin OUT level because the input pin IN inputs a falling edge level, and the current is absorbed, so that the circuit of the light emitting diode at the internal input end of the photovoltaic output optocoupler U3 is disconnected, the cut-off driving current of the output end of the photovoltaic output optocoupler U3 is further realized, and the power electronic switch formed by the high-voltage N-channel MOSFET Q1 and the high-voltage N-channel MOSFET Q2 is turned off, and the load is disconnected. The load type is a lighting lamp and a medium and small power electric appliance; the external power supply is a mains supply with 220V power frequency alternating current.
Preferably, in the utility model, the oxygen resin potting transformer T1 is 0.5W220V to 9V, the rectifier bridge B1 is MB10S, the filter capacitor C1 is 104/50V patch laminated capacitor, the filter capacitor C2 is 47uF/16V patch laminated capacitor, the filter capacitor C3 is 104/50V patch laminated capacitor, the filter capacitor C4 is 10uF/16V patch laminated capacitor, the filter capacitor C5 is 104/50V patch laminated capacitor, the current limiting resistor R1 is 1206 patch thick film resistor, the electronic switch U1 is EC6A-05, the Hall switch U2 is HAL543 monopole Hall switch, the photovoltaic output optocoupler U3 is TLP190B, the low-voltage three-stage voltage regulator U4 is a three-stage voltage regulator HT7550 three-terminal voltage regulator, the high-voltage N channel MOSFET Q1 and the high-voltage N channel MOSFET Q2 are selected to be 60, the high-voltage N channel MOSFET P60 is selected to be a three-stage voltage MOSFET 60, and the PCB is 7.TP terminal pin type wiring terminal is selected to be 7 mm.
Example 2
This embodiment differs from embodiment 1 in that: a circuit board 14 is also arranged in the switch shell, and the circuit board 14 is welded and fixed on the Hall switch circuit board 7 through a metal contact pin 13;
the epoxy resin encapsulating transformer T1, the rectifier bridge B1, the filter capacitor C2, the filter capacitor C3, the filter capacitor C4, the filter capacitor C5, the current limiting resistor R1, the electronic switch U1, the Hall switch U2, the photovoltaic output optocoupler U3, the low-voltage differential three-terminal voltage stabilizer U4, the high-voltage N-channel MOSFET Q1 and the high-voltage N-channel MOSFET Q2 are arranged on the Hall switch circuit board 7; the three-position screw type PCB terminal TP1 is mounted on the circuit board 14.
Example 3
The embodiment provides a specific structure of a contactless electronic explosion-proof switch, wherein a switch shell comprises a switch panel 11, a switch front shell 12 and a switch rear shell 3, screw unthreaded holes for connecting and fixing the switch front shell 12 are formed in the switch panel 11, and the switch front shell 12 and the switch rear shell 3 are connected in a sealing mode through polytetrafluoroethylene gaskets 1.
The switch rear shell 3 is provided with a filling hole for filling quartz sand particle filler 2 into the switch shell, and a soft silicon rubber sealing ring 4 and an inner hexagonal flat head jackscrew 5 are arranged in the filling hole. The switch rear shell 3 is also provided with a wire inlet threaded hole 6 for screwing in an explosion-proof joint of an external power load sheath wire.
The center of the switch panel 11 is provided with a round hole with inclination for guiding and fixing the soft silicon rubber key 9; the round hole is formed in the center of the switch front shell 12; the soft silicon rubber key 9 is of a circular umbrella cover type solid structure, and the bottom circular ring-shaped edge 16 is restrained and fixed by the installation clearance between the switch panel 11 and the switch front shell 12; the end part of the center cylinder 15 of the soft silicon rubber key 9 is embedded with the magnetic steel 8 and is inserted into a round hole in the center of the switch front cover 12.
When the top of the soft silicon rubber key 9 is pressed, the plastic deformation occurs, the center cylinder 15 and the embedded magnetic steel 8 are driven to do horizontal displacement movement in the round hole of the switch front shell 12, when the end part of the magnetic steel 8 contacts the bottom of the round hole of the switch front shell 12, the displacement of the soft silicon rubber key 9 is stopped, when the soft silicon rubber key 9 is loosened, the elastic performance of the soft silicon rubber is recovered to the shape before pressing, and the recovery process drives the center cylinder 15 and the embedded magnetic steel 8 to do horizontal displacement movement far away from the bottom of the round hole of the switch front shell 12 in the center round hole of the switch front shell 12; the magnetic steel 8 moves left and right in the round hole of the switch front shell 12, the distance between the magnetic steel 8 and the hall switch U2 attached to the thick side surface of the wall of the center hole of the switch front shell 12 changes, when the soft silicone rubber key 9 is not pressed, the magnetic steel 8 is farthest from the hall switch U2, the magnetic field induction intensity through the hall switch U2 is weakest, when the soft silicone rubber key 9 is pressed until the soft silicone rubber key 9 can not be compressed again, the magnetic steel 8 is displaced to touch the bottom of the round hole of the switch front shell 12, and at the moment, the magnetic steel is closest to the hall switch U2, and the magnetic field induction intensity through the hall switch U2 is strongest.
In the switch of the embodiment, after an external power load sheath wire is screwed into a wire inlet threaded hole 6 through an explosion-proof joint, a closed space is formed by a switch front shell 12, a switch rear shell 3, a polytetrafluoroethylene gasket 1, a soft silicon rubber sealing ring 4, an inner hexagonal flat head jackscrew 5 and quartz sand particle fillers 2, and a Hall switch circuit board 7, a circuit board 14, electronic components and a three-position screw type PCB connecting terminal TP1 for connecting a power supply and a load wire are wrapped;
all the selected electronic components in the electronic circuit are solid-state packaging devices, and even if the switch is damaged due to the special abnormal condition with small probability, the fault point can be rapidly cooled to below the safe temperature due to the good heat dissipation, high temperature resistance, incombustibility and chemical stability of the quartz sand particle filler 2, and the fire and explosion accidents can not be caused in flammable and explosive places due to the closed explosion-proof space structural design. The filling quartz sand particle filler 2 has good heat dissipation, high temperature resistance, incombustibility and chemical stability, the three-position screw type PCB wiring terminal TP1 for an electronic component in a switch and a power supply wiring is completely sealed and coated, even if component faults happen accidentally, the faults can be rapidly cooled to below the safe temperature, and fire and explosion accidents can not be caused in flammable and explosive places by matching with the sealed explosion-proof space structure design; in addition, because the safety-increasing design filled with quartz stone particles is adopted, the repeatability of switch maintenance is realized, the irreproducibility caused by adopting epoxy resin encapsulation is avoided, and the use cost is reduced; compared with the prior explosion-proof solid-state switch technology, the safety-enhanced solid-state explosion-proof switch is safer and more reliable, has longer service life and is more suitable for special environments such as corrosion resistance, fire resistance, explosion resistance, water resistance and the like.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present utility model and are not limiting; while the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present utility model or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the utility model, it is intended to cover the scope of the utility model as claimed.

Claims (6)

1. An industrial control contactless electronic explosion-proof switch is characterized in that: the switch comprises a switch shell, a soft silicon rubber key (9), magnetic steel (8) and a Hall switch circuit board (7);
the Hall switch circuit board (7) is arranged in the switch shell and is used for installing a Hall switch U2 and other electronic components;
a round hole is formed in the switch shell corresponding to the position of the Hall switch U2, the end part of the soft silicon rubber key (9) is inlaid with the magnetic steel (8), the magnetic steel (8) is inserted into the round hole, and the distance between the magnetic steel (8) and the Hall switch U2 is changed through the pressing and restoring actions of the soft silicon rubber key (9);
the electronic components arranged on the Hall switch circuit board (7) comprise an epoxy resin encapsulated transformer T1 for converting high-voltage alternating current into safe low-voltage alternating current, so that the serial connection of external high-voltage power supply interference signals is avoided; the rectifier bridge B1, the filter capacitor C1 and the filter capacitor C2 are used for forming an alternating-current-direct-current conversion filter circuit; the low-dropout three-terminal voltage regulator U4, the filter capacitor C3, the filter capacitor C4 and the filter capacitor C5 are used for forming a direct-current voltage stabilizing circuit;
the high-voltage N-channel MOSFET tube comprises a current limiting resistor R1, an electronic switch U1, a Hall switch U2, a photovoltaic output optocoupler U3, a high-voltage N-channel MOSFET tube Q1, a high-voltage N-channel MOSFET tube Q2 and a three-position screw type PCB connecting terminal TP1;
the two wiring terminals of the primary winding of the epoxy resin encapsulated transformer T1 are connected with the L pin and the N pin of the three-position screw type PCB wiring terminal TP1, and the two wiring terminals of the secondary winding of the epoxy resin encapsulated transformer T1 are respectively connected with the two alternating current input pins of the rectifier bridge B1;
the positive pin of the direct current output end of the rectifier bridge B1 is respectively connected with the filter capacitor C1, one end of the pin of the filter capacitor C2 and the Vin pin of the low-dropout three-terminal voltage regulator U4, and the other ends of the pin of the filter capacitor C1 and the filter capacitor C2 and the negative pin of the direct current output end of the rectifier bridge B1 are connected with a power supply ground end;
the VSS pin of the low-dropout three-terminal voltage regulator U4 is connected with a power supply ground terminal, the Vout pin of the low-dropout three-terminal voltage regulator U4 is respectively connected with the filter capacitor C3, the filter capacitor C4, the Vin pin of the filter capacitor C5 and the Vin pin of the Hall switch U2, the Vin pin of the electronic switch U1 and the one end pin of the current-limiting resistor R1, the other end pins of the filter capacitor C3, the filter capacitor C4 and the filter capacitor C5 are connected with the power supply ground terminal, the VSS pin of the Hall switch U2 and the VSS pin of the electronic switch U1 are connected with the power supply ground terminal, and the OUT pin of the Hall switch U2 is connected with the IN pin of the electronic switch U1;
the other end pin of the current limiting resistor R1 is connected with the positive electrode of the input end of the photovoltaic output optocoupler U3, the negative electrode of the input end of the photovoltaic output optocoupler U3 is connected with the OUT pin of the electronic switch U1, the positive electrode pin of the output end of the photovoltaic output optocoupler U3 is respectively connected with the grid pin of the high-voltage N-channel MOSFET Q1 and the grid pin of the high-voltage N-channel MOSFET Q2, the negative electrode pin of the output end of the photovoltaic output optocoupler U3 is respectively connected with the source pin of the high-voltage N-channel MOSFET Q1 and the source pin of the high-voltage N-channel MOSFET Q2, and the drain pin of the high-voltage N-channel MOSFET Q1 and the drain pin of the high-voltage N-channel MOSFET Q2 are respectively connected with the L pin and the L1 pin of the three-position screw type PCB connecting terminal TP1;
during the working and use period of the switch, if the switch is in an off state, when the switch needs to be turned on, the soft silicon rubber key (9) is pressed down, so that the distance between the magnetic steel (8) embedded at the end part of the central cylinder (15) and the Hall switch U2 is nearest;
if the switch is required to be closed, the soft silicone rubber button (9) is pressed down.
2. The industrial control contactless electronic explosion-proof switch of claim 1, wherein: the switch shell comprises a switch panel (11), a switch front shell (12) and a switch rear shell (3), screw unthreaded holes for being connected and fixed with the switch front shell (12) are formed in the switch panel (11), and the switch front shell (12) and the switch rear shell (3) are connected in a sealing mode through polytetrafluoroethylene gaskets (1).
3. The industrial control contactless electronic explosion-proof switch of claim 2, wherein: the novel quartz sand switch is characterized in that the switch rear shell (3) is provided with a filling hole for filling quartz sand particle fillers (2) into the switch shell, and a soft silicon rubber sealing ring (4) and an inner hexagonal flat head jackscrew (5) are arranged in the filling hole.
4. The industrial control contactless electronic explosion-proof switch of claim 3, wherein: the switch back shell (3) is also provided with a wire inlet threaded hole (6) for screwing in an explosion-proof joint of an external power load sheath wire.
5. The industrial control contactless electronic explosion-proof switch of any one of claims 2-4, wherein: the center of the switch panel (11) is provided with a round hole with inclination for guiding and fixing the soft silicon rubber key (9);
the round hole is formed in the center of the switch front shell (12);
the soft silicon rubber key (9) is of a circular umbrella cover type solid structure, and a bottom circular ring-shaped edge (16) is restrained and fixed by the installation clearance between the switch panel (11) and the switch front shell (12);
the end part of the center cylinder (15) of the soft silicon rubber key (9) is embedded with the magnetic steel (8) and is inserted into a round hole in the center of the switch front cover (12).
6. The industrial control contactless electronic explosion-proof switch of claim 1, wherein: a circuit board (14) is further arranged in the switch shell, and the circuit board (14) is welded and fixed on the Hall switch circuit board (7) through a metal contact pin (13);
the epoxy resin encapsulating transformer T1, the rectifier bridge B1, the filter capacitor C2, the filter capacitor C3, the filter capacitor C4, the filter capacitor C5, the current limiting resistor R1, the electronic switch U1, the Hall switch U2, the photovoltaic output optocoupler U3, the low-voltage differential three-terminal voltage stabilizer U4, the high-voltage N-channel MOSFET Q1 and the high-voltage N-channel MOSFET Q2 are arranged on the Hall switch circuit board (7);
the three-position screw type PCB connecting terminal TP1 is mounted on the circuit board (14).
CN201811629797.6A 2018-12-29 2018-12-29 Industrial control contactless electronic explosion-proof switch Active CN109412571B (en)

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