CN103885343A - Wireless gateway device with explosion suppression and electromagnetic shielding function - Google Patents
Wireless gateway device with explosion suppression and electromagnetic shielding function Download PDFInfo
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- CN103885343A CN103885343A CN201210559317.XA CN201210559317A CN103885343A CN 103885343 A CN103885343 A CN 103885343A CN 201210559317 A CN201210559317 A CN 201210559317A CN 103885343 A CN103885343 A CN 103885343A
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- gateway device
- wireless gateway
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Abstract
An industrial process device with a wireless function is provided. An internal circuit of the device is protected by an external metal housing. The housing of the device is made of a metal material having the electromagnetic shielding function and is grounded. The internal circuit adopts protection measures, such as differential-mode noise suppression, common-mode noise suppression, overvoltage and overcurrent protection and the like, so that the influence of electromagnetic interference in a factory on a circuit can be greatly reduced; and meanwhile, the metal housing can also shield the interference generated by the internal circuit in the metal housing, thereby not causing influence to the environment outside environment. The structure of the housing is designed in an explosion-suppression manner; the structure parameters accord with relevant provisions in national explosion-proof standard GB3836.2-2010 (equipment protected by explosion-proof housings "d " in explosive atmospheres), and the wireless gateway device is allowed to operate safely in an industrial environment having inflammable gases.
Description
Technical field
The present invention relates to one can be by WIA(Wireless Networks for Industrial Automation) network on-site wireless equipment is connected with host computer system, and realize the wireless device of network management and information interaction, this device can effectively shield outside electromagnetic interference, and has resistance to quick-fried property and propagation of explosion not.
Background technology
Intelligent wireless network WIA is based on short-distance wireless communication IEEE802.15.4 standard, use free frequency band, solve multipath effect wireless signal reflection, scattering being caused at large-scale apparatus, metallic conduit etc., and the electromagnetic noise that the running of motor, apparatus produces disturbs radio communication, provide highly reliable, real-time radio Communications service.Intelligent wireless network WIA technology is specially adapted to Industry Control and factory automation process control, and is widely used in the fields such as oil, chemical industry, metallurgy, mine.
In many industrial process environment, inflammable gas is present in the environment space that surrounds industrial process field device, under the accidental short circuit or malfunction of circuit, the circuit of device interior can carry enough electric energy and produce spark and light inflammable gas, therefore keep measure in the urgent need to one, within inflammable gas access arrangement shell, lighted generation explosion time by electric spark, within explosive flame can being limited in to device housings, and can not light the flammable gas in housing exterior environment, thereby ensure site environment and personnel's safety, prevent the further deterioration of situation.
Electromagnetic interference (EMI) is present in industrial environment widely, and the radiated electromagnetic wave that in factory, the operation of various consumers all can be in various degree disturbs the normal work of electronic equipment.Therefore, take necessary shielding measure, make electronic equipment reduced to by the degree of electromagnetic interference (EMI) and can make the degree of the reliable normal operation of equipment be very important.
Summary of the invention
For prior art above shortcomings part, the technical problem to be solved in the present invention is to provide a kind of wireless gateway device with flame proof and electromagnetic screen, effectively shields outside electromagnetic interference, and has resistance to quick-fried property and propagation of explosion not.
The technical scheme that the present invention adopted is for achieving the above object: a kind of wireless gateway device with flame proof and electromagnetic screen, the holding circuit of described wireless gateway device connects voltage dependent resistor (VDR) between the positive and negative terminal of input power, the anode of described voltage dependent resistor (VDR) input power is connected gas-discharge tube by differential mode inductance respectively with negative terminal, the two ends of described gas-discharge tube be linked in sequence Zener diode, common mode inductance and voltage reduction module, and by the output terminal of described voltage reduction module as power output end; The two ends of described gas-discharge tube connect casing ground by a TVS pipe respectively
Described casing ground is the shell of described wireless gateway device, and this shell is metal shell.
Described casing ground connects the earth.
The terminals of described wireless gateway device will be isolated inside and outside gateway shell by explosion-proof bolt.
The antenna end of described wireless gateway device will be isolated inside and outside gateway shell by explosion-proof bolt.
The pitch of described explosion-proof bolt is 1.5mm, and the depth of engagement is 15mm.
The antenna of described wireless gateway device is connected by explosion-proof bolt with gateway housing.
The pitch of described explosion-proof bolt is 1.5mm, and the depth of engagement is 15mm.
The gateway bonnet of described wireless gateway device and the composition surface of gateway shell are plane engaging surface.
The width on described composition surface is 15mm, and flame proof gap is 0.15mm.
The present invention has the following advantages:
1. the flame proof of shell and electromagnetic screen integrated design.
2. resistance to quick-fried property and not propagation of explosion.
3. internal protection circuitry design makes equipment have anti-interference.
4. inner integrated WIA-PA(Wireless Networks for Industrial Automation-ProcessAutomation) standard, WIA wireless network be can add, and WIA wireless network and WIA wireless device managed.
Brief description of the drawings
Fig. 1 is the industrial control system topological diagram that has WIA radio network gateway;
Fig. 2 is WIA radio network gateway outer casing construction drawing;
Fig. 3 is WIA radio network gateway casing explosion-proof composition surface size schematic diagram;
Fig. 4 is the anti-electromagnetic interference (EMI) holding circuit of WIA radio network gateway power unit structural drawing;
Fig. 5 is the workflow diagram of WIA radio network gateway.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
WIA radio network gateway is WIA server parts, is mainly responsible for management, scheduling and the optimization of whole network, set and maintaining network messaging parameter, and be network equipment allocate communications resource.The procedural information of industry spot is installed in on-the-spot wireless instrument collection and is sent to WIA radio network gateway, WIA radio network gateway is connected with host computer system, by integrated the metrical information of the field apparatus host computer system to control center, managerial personnel can carry out on-line monitoring to production run in control center.
Fig. 1 has shown the industrial control system of WIA radio network gateway topological diagram, comprising: host computer 10, gateway device 13, redundant gateway equipment 12, universal serial bus or Industrial Ethernet 11, controller and port one 5, and field apparatus 16-25.Host computer 10 is platforms of user, network management and maintenance personnel and WIA network interaction, and user can be configured on-site wireless network 26 by the host computer network management software and carry out information interaction with field apparatus 16-25.Radio network gateway 13 is communicated by letter with host computer by universal serial bus or Industrial Ethernet 11, communicate by letter with field apparatus 16-25 by on-site wireless network 26, and be connected with redundant gateway 12 by Ethernet 14, redundant gateway 12 can switch by data backup and equipment the reliable payment that ensures data in the time that fault occurs, avoid the critical process data that cause because of single point failure or equipment failure and the loss of metrical information, the reliability service of support process supervisory system.Controller and port one 5 comprise traditional DCS controller, PLC controller etc., and it and traditional wired instrument 16,17 are connected, and the metrical information of conventional instrument 16,17 can be integrated into host computer system by universal serial bus or Industrial Ethernet 11.In addition, WIA wireless adapter 18,19 can be communicated by letter with wired HART instrument 16,17, and the metrical information of wired HART instrument 16,17 is sent to WIA radio network gateway 13 by on-site wireless network 26, realizes wired tradition instrument is upgraded to WIA wireless instrument.On-the-spot wireless device 20-25 comprises various wireless transmitters (WIA wireless temperature transmitter, WIA wireless pressure transmitter, WIA wireless vibration transmitter and WIA wireless module etc.) and wireless router (WIA wireless router, WIA wireless relay apparatus) etc., they can measure and forward the procedural information of industry spot, are sent to WIA radio network gateway 13 by on-site wireless network.
The flame proof design of WIA gateway shell has ensured that it has enough physical strengths, can bear inner explosion pressure and not damage, when after internal explosion, because all on shell wall and extraneous seam and the hole communicating are less than corresponding maximum experimental safe gap, ensure that the flame spreading out of can not make outside inflammable gas blast.
Fig. 2 has shown WIA radio network gateway outer casing construction drawing, in front view 31, shell bonnet 39 is fixed on housing by 8 bolts 38, while installation at the scene, pass through pilot hole 34 residential gateway equipment, antenna 37 is connected by explosion-proof bolt 36 with housing, and the terminals of gateway will be isolated inside and outside gateway shell by 4 explosion-proof bolts 35.32 is vertical view, and 40 is the mounting hole of antenna 37 end explosion-proof bolts 36.33 is upward view, and 41 is the mounting hole of terminals explosion-proof bolt.42 is gateway earthing of casing end, and equipment ground design can effectively suppress electromagnetic interference (EMI), circuit in containment vessel.The pitch of the explosion- proof bolt 35,36 that gateway shell adopts is 1.5mm; the depth of engagement is 15mm, and this parameter meets the equipment of national explosion-proof criteria GB3836.2-2010(explosive atmosphere by flameproof enclosure " d " protection) in table 3 II category-B (exemplary gases is ethene) electrical equipment is threadedly engaged with to the regulation of face.
Fig. 3 has shown the dimensional drawing on the explosion-proof composition surface of gateway shell, and 43 is enclosure, and 44 is gateway bonnet, and 45 is gateway shell, and 46 is the bolt (with in Fig. 2 38) of residential gateway bonnet.The type on the explosion-proof composition surface of gateway shell is plane engaging surface; the width L on composition surface is 15mm; flame proof gap i is 0.15mm, and this parameter meets the equipment of national explosion-proof criteria GB3836.2-2010(explosive atmosphere by flameproof enclosure " d " protection) regulation of middle table 1 to II category-B (exemplary gases is ethene) electrical equipment plane engaging surface.
The design of intra-gateway holding circuit greatly degree weaken the impact that electromagnetic interference (EMI) in environment produces circuit, guarantee equipment normally moves, the impact of the electromagnetic wave that also can weaken self radiation simultaneously on environment.
Fig. 4 is the anti-electromagnetic interference (EMI) holding circuit of gateway power unit structural drawing, and gateway power supply is input as 24V direct supply 51, and output 64 is 5V DC voltage, gives intra-gateway circuit supply.The function of holding circuit mainly comprises: overvoltage and overcurrent protection, differential mode interference suppress and common mode interference suppresses.Overvoltage and overcurrent protection part mainly comprise voltage dependent resistor (VDR) 52, gas-discharge tube 55, TVS pipe 56,57 and zener diode 61.Voltage dependent resistor (VDR) 52 can absorb transient surge voltage, and when superpotential appears at two interpolars of voltage dependent resistor (VDR), voltage dependent resistor (VDR) shows as Low ESR, can be by voltage clamping to relatively-stationary magnitude of voltage, thus realize the protection to late-class circuit.Gas-discharge tube 55 works release Lightning Transient overcurrent and over-voltage effect, the two poles of the earth of discharge tube are connected with the positive and negative electrode of power supply respectively, the common port 58 of discharge tube is connected with casing 59, casing 59 is connected with the earth 60 by wire 67, casing good earth is the important measures that suppress electromagnetic interference (EMI), discharge tube can, by casing to ground discharge, discharge the energy of transient state overcurrent.The anode 65 of electric power loop is managed (Transient Suppression Diode) 56 by TVS respectively with negative terminal 66 and is connected with casing ground 59 with 57; in the time that the two poles of the earth of TVS pipe are subject to reverse transient state high energy impact events; it can become Low ESR by the high impedance of its two interpolar; discharge by casing; absorb the surge power up to thousands of watts; make voltage clamp between electric power loop anode or negative terminal phase and casing in a predetermined value; effectively protect the precision components in electronic circuit, avoid the damage of surge pulse.61 is zener diode, its effect is that the input voltage that ensures rear class voltage reduction module is less than a particular value, puncture when being added to after the reverse voltage at its two ends reaches certain value, after puncturing, be equivalent to short circuit, prevent that input voltage from exceeding the import-restriction of voltage reduction module and damaging.Common mode inductance 62, can suppress the common mode interference in circuit, prevents the electromagnetic wave outside radiation that circuit produces.Voltage reduction module 63, realizes and converts the 24V direct supply of input to 5V direct supply, and the power module that this circuit adopted is high efficiency dc-to-dc converter, and itself has the defencive function such as filtering, isolated from power, makes the ripple of output voltage and noise minimum.
Fig. 5 is the workflow diagram of WIA radio network gateway, start after 71, first gateway device is connected to 72 by universal serial bus or Industrial Ethernet with host computer, by host computer h.323-configured gateway device parameter 73, then by WIA radio network gateway tissue construction on-site wireless network, on-site wireless equipment is joined to WIA wireless network 74 one by one, and be field apparatus allocate communications resources, configuration network parameter and configuration info 75 is set, field apparatus starts operation, production run is carried out to Real-Time Monitoring, and measurement data is sent to WIA radio network gateway 76, WIA radio network gateway is integrated into host computer system 77 by these process datas by universal serial bus or Industrial Ethernet, host computer can judge according to the status information of gateway whether gateway device normally moves 78, if gateway operation exception, carry out gateway device switching, start redundant gateway, redundant gateway originally switches to primary gateway, primary gateway originally switches to redundant gateway 79 after restarting, if gateway normal operation, gateway enters holding state, waits for that field apparatus sends metrical information to gateway again.
Claims (10)
1. one kind has the wireless gateway device of flame proof and electromagnetic screen, it is characterized in that, the holding circuit of described wireless gateway device connects voltage dependent resistor (VDR) between the positive and negative terminal of input power, the anode of described voltage dependent resistor (VDR) input power is connected gas-discharge tube by differential mode inductance respectively with negative terminal, the two ends of described gas-discharge tube be linked in sequence Zener diode, common mode inductance and voltage reduction module, and by the output terminal of described voltage reduction module as power output end; The two ends of described gas-discharge tube connect casing ground by a TVS pipe respectively.
2. the wireless gateway device with flame proof and electromagnetic screen according to claim 1, is characterized in that, described casing ground is the shell of described wireless gateway device, and this shell is metal shell.
3. the wireless gateway device with flame proof and electromagnetic screen according to claim 1 and 2, is characterized in that, described casing ground connects the earth.
4. the wireless gateway device with flame proof and electromagnetic screen according to claim 1, is characterized in that, the terminals of described wireless gateway device will be isolated inside and outside gateway shell by explosion-proof bolt (35).
5. the wireless gateway device with flame proof and electromagnetic screen according to claim 1, is characterized in that, the antenna end of described wireless gateway device will be isolated inside and outside gateway shell by explosion-proof bolt (36).
6. the wireless gateway device with flame proof and electromagnetic screen according to claim 4, is characterized in that, the pitch of described explosion-proof bolt (35) is 1.5mm, and the depth of engagement is 15mm.
7. the wireless gateway device with flame proof and electromagnetic screen according to claim 1, is characterized in that, the antenna of described wireless gateway device is connected by explosion-proof bolt (36) with gateway housing.
8. the wireless gateway device with flame proof and electromagnetic screen according to claim 7, is characterized in that, the pitch of described explosion-proof bolt (36) is 1.5mm, and the depth of engagement is 15mm.
9. the wireless gateway device with flame proof and electromagnetic screen according to claim 1, is characterized in that, the gateway bonnet (44) of described wireless gateway device and the composition surface of gateway shell (45) are plane engaging surface.
10. the wireless gateway device with flame proof and electromagnetic screen according to claim 9, is characterized in that, the width on described composition surface is 15mm, and flame proof gap is 0.15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210559317.XA CN103885343A (en) | 2012-12-20 | 2012-12-20 | Wireless gateway device with explosion suppression and electromagnetic shielding function |
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| CN201210559317.XA CN103885343A (en) | 2012-12-20 | 2012-12-20 | Wireless gateway device with explosion suppression and electromagnetic shielding function |
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| CN103885343A true CN103885343A (en) | 2014-06-25 |
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| CN106209262A (en) * | 2016-10-10 | 2016-12-07 | 深圳市共进电子股份有限公司 | A kind of ground structure of home gateway |
| CN106753445A (en) * | 2017-01-23 | 2017-05-31 | 中冶焦耐(大连)工程技术有限公司 | A kind of coke oven crossover main temperature wireless acquisition system |
| CN110446991A (en) * | 2017-03-06 | 2019-11-12 | 横河电机株式会社 | Managing device, relay, on-site wireless system, setting method, program and recording medium |
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| CN101079573A (en) * | 2007-06-29 | 2007-11-28 | 中兴通讯股份有限公司 | A power interface circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106209262A (en) * | 2016-10-10 | 2016-12-07 | 深圳市共进电子股份有限公司 | A kind of ground structure of home gateway |
| CN106209262B (en) * | 2016-10-10 | 2019-02-05 | 深圳市共进电子股份有限公司 | A kind of ground structure of home gateway |
| CN106753445A (en) * | 2017-01-23 | 2017-05-31 | 中冶焦耐(大连)工程技术有限公司 | A kind of coke oven crossover main temperature wireless acquisition system |
| CN110446991A (en) * | 2017-03-06 | 2019-11-12 | 横河电机株式会社 | Managing device, relay, on-site wireless system, setting method, program and recording medium |
| CN110446991B (en) * | 2017-03-06 | 2022-10-14 | 横河电机株式会社 | Management device, field wireless system, and setting method |
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Application publication date: 20140625 |