CN201726615U

CN201726615U - Anti-electromagnetic interference type electronic box

Info

Publication number: CN201726615U
Application number: CN2010202795886U
Authority: CN
Inventors: 叶倩
Original assignee: KUNSHAN TECKA ELECTROMECHANICAL CO Ltd
Current assignee: KUNSHAN TECKA ELECTROMECHANICAL CO Ltd
Priority date: 2010-08-03
Filing date: 2010-08-03
Publication date: 2011-01-26
Anticipated expiration: 2020-08-03

Abstract

The utility model discloses a kind of anti-electromagnetic interference type electronic box, constitute by headstock and control cabinet, headstock is installed with to compressor and condensation fan etc. provides and controls and protection, the various electric elements in the active force loop of carrying forceful electric power 380V/220V alternating current, the various electronic devices and components of control system in the unit electrical system are installed in the control cabinet, are the cores of controlling automatically; Headstock and control cabinet are made by adding steel plate, the casing plastic-blasting, the spacing of headstock and control cabinet is greater than 100mm, exchange input, output signal and direct current input, output signal and use cable separately respectively, separately enter headstock and control cabinet, the utility model has solved the magnetic field that alternating current produces in the prior art adjacent electric wire effect has been produced electric current, influences the light current electric current, cause the generation accident, influence the problem of the operate as normal of control system.

Description

Anti-electromagnetic interference type electronic box

Technical field

The utility model relates to a kind of anti-electromagnetic interference type electronic box, relates in particular to a kind of anti-electromagnetic interference type electronic box that is applied to air-cooled, water-cooled unit or water source heat pump units.

Background technology

Existing air-cooled, water-cooled unit or water source heat pump units, electrical system is divided into dynamical system and control system, and dynamical system adopts 3/N～400/230V 50Hz power supply, and separate unit compressor current maximum reaches 500A; Control system adopts technical grade PLC controller, by the sensor acquisition weak electric signal; Receive the DC24V control signal, adopt many STD bus agreement, multiple choices Long-distance Control such as Ethernet, wired and wireless network are carried out remote monitoring and centralized control; These signals are weak electric signal, though PLC is the control device that designs for industrial production environment specially, have the ability of the stronger abominable industrial environment of adaptation, the stability and the higher reliability of operation, but because its direct with on-the-spot I/O equipment links to each other, external interference is easy to invade by power line or I/O transmission line, thereby causes the malfunction of control system; The interference that PLC is subjected to can be divided into external disturbance and internal interference.External disturbance and unit electrical system architecture are irrelevant, are at random, and interference source can't eliminate, and can only be limited in light of the circumstances; Internal interference is relevant with the unit electrical system architecture, main by exchanging main circuit in the dynamical system, analog quantity input signal etc. causes, therefore dynamical system and control system are installed in the same electric box, forceful electric power loop and weak electrical loop standoff distance are very little, sometimes, signal link is also interlaced, it is big that weak electricity system is subjected to strong power system electromagnetic interference probability, exist mutual inductance and distributed capacitance between the distribution, carry out to produce when signal transmits and harass, the magnetic field that alternating current produces produces electric current to the electric wire effect of carrying weak electric signal, though electric current is very weak, is enough to influence equally very weak light current electric current, cause the generation accident, the operate as normal of control system is exerted an influence.

The utility model content

The purpose of this utility model is to provide a kind of anti-electromagnetic interference electronic box, solves the magnetic field that alternating current produces in the prior art adjacent electric wire effect is produced electric current, influences the light current electric current, causes the generation accident, influences the problem of the operate as normal of control system.

In order to achieve the above object, the utility model adopts following technical scheme: described anti-electromagnetic interference type electronic box is made of headstock and control cabinet, headstock provides control and protection for compressor and condensation fan etc., the various electric elements in the active force loop of carrying forceful electric power 380V/220V alternating current, the various electronic devices and components of the control system of unit electrical system are installed in the control cabinet, are the cores of controlling automatically; Headstock mainly comprises binding post, A.C. contactor, thermal relay and power line; Control cabinet mainly comprises central processing unit, digital quantity expansion module, analog quantity expansion module, Switching Power Supply, circuit breaker and control line; Headstock and control cabinet are made by adding steel plate, the casing plastic-blasting, the spacing of headstock and control cabinet is greater than 100mm, exchange input, output signal and direct current input, output signal and use cable separately respectively, separately enter headstock and control cabinet, the input of integrated circuit or transistor arrangement, output signal line use shielded type cable, shielded type cable is unsettled at input, outlet side, controller side joint ground; The earth connection of controller separates with power line or power line, and in the outside wiring of electric box, input, output signal line separate distribution with the power line of high voltage, big electric current.

Compare with prior art, the utlity model has following advantage:

Reasonably electric elements are arranged, reasonably the electric wiring configuration weakens and suppressed internal interference and prevented external disturbance; Prevent or reduced the interference of distribution; Prevent or reduced the interference of forceful electric power that make unit work more stable, control precision is higher to light current; Safer when simultaneously control system being overhauled, eliminate or reduced potential safety hazard; Reduce the failure rate of central air-conditioning, improved the whole service life of central air-conditioning.

Description of drawings

Figure 1 shows that monnolithic case figure of the present utility model;

Figure 2 shows that headstock electric elements layout plan of the present utility model;

Figure 3 shows that control cabinet electric elements layout plan of the present utility model.

Among the figure

1 headstock, 2 control cabinets, 3 binding posts, 4 A.C. contactors, 5 thermal relays, 6 power lines, 7 central processing units, 8 digital quantity expansion modules, 9 analog quantity expansion modules, 10 Switching Power Supplies, 11 circuit breakers, 12 control lines

Embodiment

Below in conjunction with accompanying drawing, specify the utility model.

The anti-electromagnetic interference type electronic box that the utility model relates to; constitute by headstock 1 and control cabinet 2; headstock 1 provides control and protection for compressor and condensation fan etc.; the various electric elements in the active force loop of carrying forceful electric power 380V/220V alternating current; 2 li various electronic devices and components that the control system of unit electrical system is installed of control cabinet are cores of controlling automatically.

Headstock 1 mainly comprises binding post 3, A.C. contactor 4, thermal relay 5 and power line 6; the big electric current that binding post 3 inserts from 3/N～400/230V 50Hz power supply; A.C. contactor 4 is used for connecting continually at a distance or disjunction 380V alternating current circuit, and thermal relay 5 is used for providing overload protection for motor.

Control cabinet 2 mainly comprises central processing unit 7, digital quantity expansion module 8, analog quantity expansion module 9, Switching Power Supply 10, circuit breaker 11 and control line 12,7 pairs of digital quantity expansion modules 8 of central processing unit and analog quantity expansion module 9 are gathered the signal of coming, judged and calculated, various signals after handling are realized automation control by digital quantity expansion module 8 and 9 outputs of analog quantity expansion module respectively, Switching Power Supply 10 provides DC24V power supply for PLC, circuit breaker 11 control system power supplys.

Headstock 1 and control cabinet 2 are made by adding steel plate, the casing plastic-blasting, when in unit, electronic box being installed, guarantee that headstock 1 and control cabinet 2 have the spacing of 100mm, exchange input, output signal and direct current input, output signal and use cable separately respectively, separately enter headstock 1 and control cabinet 2, the input of integrated circuit or transistor arrangement, output signal line, use shielded type cable, shielded type cable is unsettled at input, outlet side, controller side joint ground; The earth connection of controller separates with power line or power line, and in the outside wiring of electric box, input, output signal line separate distribution with the power line of high voltage, big electric current.

More than disclosed be the specific embodiment of this patent only, but this patent is not limited thereto, any those skilled in the art can think variation, all should drop in the protection range of this patent.

Claims

1. anti-electromagnetic interference type electronic box, it is characterized in that: constitute by headstock (1) and control cabinet (2), headstock (1) mainly comprises binding post (3), A.C. contactor (4), thermal relay (5) and power line (6), and control cabinet (2) mainly comprises central processing unit (7), digital quantity expansion module (8), analog quantity expansion module (9), Switching Power Supply (10), circuit breaker (11) and control line (12).

2. anti-electromagnetic interference type electronic box as claimed in claim 1, it is characterized in that: the spacing of described headstock (1) and control cabinet (2) is greater than 100mm, exchange input, output signal and direct current input, output signal and use cable separately respectively, separately enter headstock (1) and control cabinet (2).