RU155547U1 - EXACTLESS READER EXPLOSION-PROTECTED - Google Patents

Abstract

1. Explosion-proof contactless reader, characterized by the presence of an electronic reader board, an output cable designed to connect the board with external devices, characterized in that the reader's electronic board is placed in a metal case, one of the walls of which is completely or in the form of a partial insert made of material that transmits electromagnetic radiation 2. Explosion-proof contactless reader according to claim 1, characterized in that it additionally contains a commutation board. 3. Explosion-proof contactless reader according to claim 1 or 2, characterized in that one or both boards with electronic components are filled with a sealing compound. 4. Explosion-proof contactless reader according to claim 2, characterized in that the output cable for connecting the board with external devices is led out of the metal case through the explosion-proof cable output device. Explosion-proof contactless reader according to claim 2, characterized in that the reader's electronic board is enclosed in its own plastic case.

Description

The utility model relates to the field of monitoring and signaling, and in particular, to devices for reading an electromagnetic signal, which are installed in areas of high explosion hazard.

The device is intended for reading code information from contactless cards and converting it into a standard format, transmitted for analysis and decision making to the controller, mainly in access control systems and fire alarm systems for contactless personnel identification.

A contactless reader is known that provides a partial solution to the problem by increasing the protection of the electronic board from external atmospheric and mechanical influences due to the presence of structural elements tightening around them. Utility model RU No. 45035.

The disadvantages of the known design of a contactless reader that do not allow its use in explosive atmospheres include the following:

- the case is not flameproof, and filling the electronic circuit board with a compound does not guarantee its protection against mechanical damage, which does not meet the requirements of GOST R 51330.13-99, in terms of ensuring the requirements for explosion-proof electrical equipment used in hazardous areas;

- there is no reliable mechanical cable fastening in the reader housing: the cable is connected to the electronic board through an opening in the housing, which does not meet the requirements (cable fastening at the outlet from the housing, cable sealing to ensure the degree of protection of the sheath) GOST R 52350.0-2005 “Electrical equipment for explosive gas atmospheres "

(Appendix A, Ex-cable entries), as well as the requirements of paragraph 5 of GOST R 51330.13-99 in terms of ensuring the tightness and mechanical strength of the sheath by type of protection “s” (special type of explosion protection) according to GOST 22782.3-77.

The problem to which the present utility model is directed is to obtain electrical equipment adapted for use in hazardous areas.

The technical result consists in increasing the isolation of the product from the environment and protection from external (including mechanical) influences, increasing the explosion safety of the reader.

DETAILED DESCRIPTION

Description of graphic material.

The figure shows a drawing of the inventive explosion-proof reader - front, top, side views.

Accepted designations.

1 - electronic board of the reader.

2 - a plastic case.

3 - patch board.

4 - sealant (sealing compound).

5 - metal case.

6 - insert that transmits (not shielding) electromagnetic radiation.

7 - cable entry.

8 - metal cover.

9 - cable from the electronic board of the reader.

10 - external cable.

11 - grounding terminal.

The claimed technical result is achieved due to the fact that the electronic board of the reader is placed in an additional metal case containing a radio-transparent (non-shielding electromagnetic radiation) wall or a partial insert into one of the walls that protects the reader board located in the formed shell and, preferably, filled with a sealing compound. The metal housing further comprises a sealed cable entry.

The essence of the claimed utility model is illustrated in the presented figure.

On the example of the claimed design of an explosion-proof reader, information is provided that confirms the feasibility of implementing a utility model to obtain the above technical result.

The inventive device is an explosion-proof reader, consists of an electronic reader board 1 and a switching board 3, filled with a sealing compound (sealant) 4, and placed in an additional metal housing 5 with a permeable (non-shielding) for electromagnetic radiation insert 6 or a whole wall, cable entry 7 , and a metal cover 8.

The cable from the electronic board of the reader 9 is connected to an external cable 10 and removed from the housing through an explosion-proof cable entry 7. For grounding the reader, a grounding terminal 11 is installed on the metal housing.

The reader electronic circuit board may be a finished product containing its own plastic housing 2.

The device operates as follows.

The device in the course of normal operation exchanges information with external devices through a radio-transparent insert 6 or a radio-transparent side wall. The metal case 5 protects the electronic board 1 of the reader located in the formed shell and the switching board 3 from external, including mechanical, influences. Additionally, to isolate the area of possible ignition or sparking of electronic components from the external explosive atmosphere, the boards can be additionally filled with a sealing compound 4. From the reader board 1 through the internal cable 9, the signal is sent to external devices via cable 10 through the cable entry 7, consisting of a cable gland case sleeve, through which the cable is passed, and an adapter, which, turning on the case sleeve, compresses the rubber seal located in it, fixing and sealing the cable 10.

With respect to readers intended for use in hazardous areas (a room or limited space in a room or outdoor installation in which explosive mixtures are or may form), special measures are applied to prevent ignition of the surrounding explosive gas atmosphere - types of explosion protection established by GOST R 51330.13 -99 "Explosion-proof electrical equipment."

The design of the claimed technical solution provides the following, in accordance with Section 5 of paragraph 5.2.2. GOST R 51330.13-99, types of explosion protection:

A) “Special type of protection 5”.

This type of protection is provided by a special constructive solution for cable entry and allows you to fully comply with the requirements of GOST 22782.3-77 in terms of the design of the explosion protection enclosure according to type "S" - special protection of electrical equipment. Products with explosion protection type “S” can be used in mines and mines.

B) “Type of protection - m” - sealing by a compound in accordance with GOST 51330.17.

This type of explosion protection is provided by sealing electrical equipment (conductive winding and current-carrying conductors connected to its terminals) with a sealing compound, which provides protection against moisture penetration and, in case of electrical equipment malfunction, localizes a fire inside itself.

The claimed design of the explosion-proof reader provides not only the sealing of conductive elements installed in the internal volume of the shell, but also their protection against mechanical damage by an additional metal cover, which together with the outer surface of the additional metal case is explosion-proof (in case of a gas explosion inside the shell as a result of sparking or short circuit dangerous damage to the shell occurs; the explosion does not spread to the environment) mechanically chnuyu shell.

Thus, in case of electrical equipment ignition due to a malfunction, the sealing compound and the metal casing will not allow igniting the explosive mixture outside the casing, and the metal casing will also protect the electrical equipment located inside the casing from mechanical damage.

Subject to the above requirements, the claimed reader can be considered explosion-proof and used in areas of high explosion hazard.

Claims (5)

1. Non-contact reader explosion-proof, characterized by the presence of an electronic board of the reader, an output cable designed to connect the board to external devices, characterized in that the electronic board of the reader is placed in a metal case, one of the walls of which is completely or in the form of a partial insert made of a material that passes electromagnetic radiation. 2. The non-contact reader explosion-proof according to claim 1, characterized in that it further comprises a patch board. 3. The non-contact explosion-proof reader according to claim 1 or 2, characterized in that one or both of the circuit boards with electronic components is sealed with a sealing compound. 4. The non-contact explosion-proof reader according to claim 2, characterized in that the output cable intended for connecting the board to external devices is brought out of the metal case through an explosion-proof cable output device. 5. The non-contact reader explosion-proof according to claim 2, characterized in that the electronic board of the reader is enclosed in its own plastic case.

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