CN204856079U

CN204856079U - Switching value isolated safety barrier

Info

Publication number: CN204856079U
Application number: CN201520491307.6U
Authority: CN
Inventors: 马广辉; 侯荣奇
Original assignee: SUZHOU BEIJIAFU EXPLOSION-PROOF ELECTRICAL Co Ltd
Current assignee: The Suzhou times jia'an explosion-proof electricity limited company
Priority date: 2015-07-09
Filing date: 2015-07-09
Publication date: 2015-12-09
Anticipated expiration: 2025-07-09

Abstract

The utility model provides a switching value isolated safety barrier, includes that power supply circuit, explosion -proof processing module, filter amplifier module, disconnection detection module, logic set up module, signal isolation module, relay operation module, output circuit. Switching value isolated safety barrier, simple structure, low in production cost, temperature characteristic is good, the response is fast, the low -power consumption, keep apart effectually and the reliability is high.

Description

A kind of switching value isolating safety grid

Technical field

The utility model relates to a kind of safety barrier, particularly a kind of switching value isolating safety grid.

Background technology

Safety barrier also known as safety holder, the safe interface in intrinsic safety loop, it can between place of safety and explosive area bi-directional electric signal, and the place of safety caused because of fault can be limited pass on to the energy in explosive area.Be divided into two large classes by the full grid of structure: a class is Zener type safety barrier, its principle is simple, circuit realiration is easy, cheap, but be greatly affected because of the reliability in making it apply due to the defect of himself principle, and limit its range of application.Isolating safety grid have employed input, exports and the circuit structure of power supply mutual electrical isolation three party, meets the requirement of intrinsic safety type restriction energy simultaneously.With Zener type safely compared with, isolating safety grid has outstanding advantage and more extensive use, although its price is a little more than Zener type safety barrier, from design, construction and installation, debug and be maintained as original consideration, its integrated cost is on the contrary lower than Zener type safety barrier.Requiring that higher engineering site almost have employed isolating safety grid bar none as main intrinsic safe explosion-proof instrument, isolating safety grid instead of Zener type safety barrier gradually, obtains increasingly extensive application in safety anti-explosive field.

Safety barrier is widely used in the industrial instrument front end signal process in the field such as explosion-proof, and for raising industrial processes automatic control system antijamming capability, Guarantee control system stability and reliability have very important effect.In manufacturing districts such as coal, oil, rock gases, in the controls, no matter be the signal that collection in worksite arrives, or from controller toward the on-the-spot signal sent, there is on-off model all in a large number.

Utility model content

Utility model object: the purpose of this utility model is to provide a kind of switching value isolating safety grid, this switching value isolating safety grid isolation effect is good, reliability is high, good temp characteristic, response are fast, low-power consumption, isolating safety grid that production cost is low.

Technical scheme: a kind of switching value isolating safety grid, comprises power circuit, technological processing for explosion protection feature module, filter and amplification module, burn out detection module, logic arranges module, signal isolation module, actuating of relay module, output circuit; The output terminal of described power circuit connects the input end of technological processing for explosion protection feature module and signal isolation module respectively; The output terminal of described technological processing for explosion protection feature module connects the input end of filter and amplification module; The output terminal of described filter and amplification module connects the input end of burn out detection module; The output terminal of described burn out detection module connects the input end that logic arranges module; Described logic arranges the input end of the output terminal connection signal isolation module of module; The output terminal of described signal isolation module connects the input end of actuating of relay module; The output terminal of described actuating of relay module connects output circuit.Switching value isolating safety grid described in the utility model, structure is simple, and production cost is low.On-off signal safety barrier, by from the active of explosive area or passive switch amount signal, is transferred to security applications by isolation safe grid, and the way of output has relay or the collector way of output, can carry out positive and negative effect simultaneously and select.This design also will enter end, output terminal and power end three end and be separated, and can connect travel switch, limit switch, pressure switch, level switch etc.Without the need to system earth circuit, bring great convenience to design and site operation.Because signal line is without the need to common, the stability of detection and control loop signal and antijamming capability is strengthened greatly, thus improves the reliability of whole system.Logic arranges the isolation of module integration intelligence except general function, also can support to carry out logical process to signal, arranges to report to the police to export state, and the function for isolator brings revolutionary progress, has widened the usable range of isolator.Corresponding fast, the low-power consumption of switching value isolating safety grid described in the utility model, reduce the interference that transmission line is subject to noise simultaneously, improve isolation effect and improve the stability of device.

Above-mentioned switching value isolating safety grid, described power circuit comprises power input part, transformer and power output part.Described power circuit exports constant voltage supply integrated circuit and modules by transformer is stable, and power supply can adjust flexibly according to budget.

Above-mentioned switching value isolating safety grid, described signal isolation module adopts optical coupling isolator or magnetic coupling digital isolator.Optical coupling isolator or magnetic coupling digital isolator can be selected as required to signal isolation module.Wherein optical coupling isolator product category is various, low price.Its signal one-way transmission, input end and output terminal fully achieve electrical isolation isolates, and outputs signal on input end without impact, and antijamming capability is strong, contactless, long service life.And magnetic coupling digital isolator is low in energy consumption, digital isolator under low frequency condition a use photo-coupler power 1%; Under the highest transfer rate condition of photo-coupler, it uses about 20% of photo-coupler power, reduces power and it can be made to improve reliability.

Technique scheme can be found out, the utility model has following beneficial effect: switching value isolating safety grid described in the utility model, and structure is simple, and production cost is low, and good temp characteristic, response are fast, low-power consumption, isolation effect is good and reliability is high.

Accompanying drawing explanation

Fig. 1 is the schematic block circuit diagram of switching value isolating safety grid described in the utility model;

Fig. 2 is the theory diagram of the power circuit of switching value isolating safety grid described in the utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, illustrate the utility model further.

Switching value isolating safety grid as shown in Figure 1, comprises power circuit, technological processing for explosion protection feature module, filter and amplification module, burn out detection module, logic arranges module, signal isolation module, actuating of relay module, output circuit; The output terminal of described power circuit connects the input end of technological processing for explosion protection feature module and signal isolation module respectively; The output terminal of described technological processing for explosion protection feature module connects the input end of filter and amplification module; The output terminal of described filter and amplification module connects the input end of burn out detection module; The output terminal of described burn out detection module connects the input end that logic arranges module; Described logic arranges the input end of the output terminal connection signal isolation module of module; The output terminal of described signal isolation module connects the input end of actuating of relay module; The output terminal of described actuating of relay module connects output circuit.

As shown in Figure 2, power circuit is that safety barrier is powered, and by power input part, transformer and power output part, described power output part comprises the output of 5V voltage, 3.3V voltage exports and other voltage exports, and exports constant voltage supply integrated circuit and modules.Signal isolation module can adopt optical coupling isolator or magnetic coupling digital isolator, and the present embodiment signal isolation module adopts ADUM7643 four-way magnetic coupling digital isolator, and its volume is little, and stability, real-time are good.

During work, signal, from hazardous side dry contact, proximity switch input, carries out intracellular signaling by above-mentioned module, exports from secure side relay contact.

The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvement, these improvement also should be considered as protection domain of the present utility model.

Claims

1. a switching value isolating safety grid, is characterized in that: comprise power circuit, technological processing for explosion protection feature module, filter and amplification module, burn out detection module, logic arrange module, signal isolation module, actuating of relay module, output circuit; The output terminal of described power circuit connects the input end of technological processing for explosion protection feature module and signal isolation module respectively; The output terminal of described technological processing for explosion protection feature module connects the input end of filter and amplification module; The output terminal of described filter and amplification module connects the input end of burn out detection module; The output terminal of described burn out detection module connects the input end that logic arranges module; Described logic arranges the input end of the output terminal connection signal isolation module of module; The output terminal of described signal isolation module connects the input end of actuating of relay module; The output terminal of described actuating of relay module connects output circuit.

2. switching value isolating safety grid according to claim 1, is characterized in that: described power circuit comprises power input part, transformer and power output part.

3. switching value isolating safety grid according to claim 1 and 2, is characterized in that: described signal isolation module adopts optical coupling isolator or magnetic coupling digital isolator.