RU48229U1 - EXPLOSION PROTECTED POST CONTROL UNIT BUTTON - Google Patents

Abstract

The utility model relates to electrical products, in particular to control posts, designed for remote control of machines and mechanisms in stationary conditions and by means of land, sea and air transport, where they are manually operated by the operator, as well as for signaling associated with the named electric drives, or other electrical devices. The technical result that can be achieved using the proposed utility model is reduced to high mechanical strength, withstanding the pressure of the explosion and the exclusion of the transfer of the explosion into the environment. The explosion-proof push-button control post device consists of a housing 1 with a cover 2 connected by captive screws (not shown in Fig.) With an encoded head, cable entry 3, button elements panel 4, device control handle 5 with a fixed bracket (not shown in Fig.) , lever 6, while the panel of the device of the control station is made either with one button element or with two button elements, or with three button elements. The panel of push-button elements 4 is configured to carry out a switching compartment and passage clamps and at the same time acts as a wall separating the cable entry compartment from the switching compartment, forming a cylindrical flameproof connection providing explosion-proofness.

Description

The utility model relates to electrical products, in particular to control posts, designed for remote control of machines and mechanisms in stationary conditions and by means of land, sea and air transport, where they are manually operated by the operator, as well as for signaling associated with the named electric drives, or other electrical devices.

State of the art

Known control posts of the PKE series, consisting of a housing with a cover, cable entries, a switching element (see the brief reference "General industrial low-voltage equipment of mass series", Moscow, 1992)

The disadvantages of these posts are:

- low rated current, I _NOM - 10 A;

- the impossibility of use in hazardous areas due to the low mechanical strength of the hull;

- normally sparkling parts are not enclosed in a flameproof enclosure;

- low degree of protection - IP40, IP54 on the part of control elements and due to the lack of cable entries, degree of protection - IP00 on the side of wiring installation.

Known push-button control stations of the PKU 15 series, designed for switching electrical control circuits of alternating current voltage of 220 V, consisting of a housing with a cover, cable entries, switching element, closing and opening

contacts, pusher (see Push-button control posts of the PKU 15 series. OKP 342845 TU 16-526, 333-83. Kamenetz - Podolsky Electromechanical Plant).

The disadvantages of these posts is the low switching current, large dimensions.

The closest in technical essence and the achieved positive effect, and adopted by the authors for the prototype is a one-, two-button, three-button control post, consisting of a housing with a cover connected by screws, a cable entry, a panel of push-button elements, a control handle, while the housing with a cover, connected by screws form a flameproof enclosure in which normally sparking parts are enclosed (see legrand company prospectus, A. T. X. 1,2 and 3 function standard control stations., flameproof).

The disadvantages of this post is a narrow scope: only for petrochemicals, lack of water heating, temperature range: from minus 20 ° to plus 40 °.

Utility Model Disclosure

The technical result that can be achieved using the proposed utility model is reduced to high mechanical strength, withstanding the pressure of the explosion and eliminating the transfer of the explosion into the environment, due to the use of button elements in the device panels, which are a switching compartment and passage clamps, simultaneously acting as walls, separating the cable entry compartment from the switching compartment and providing explosion-proofness of the switching compartment and the cable entry compartment, and the housing is made of post-pressure material AG 4NS and expand functionality.

The technical result is achieved using the device control post explosion-proof push-button containing a housing with a cover

connected by screws, inside of which there is a cable entry, a panel of push-button elements, a control handle, while the housing with a cover, connected by screws form an explosion-proof enclosure in which normally sparking parts are enclosed, and the panel of push-buttons is configured to carry out a switching compartment, passage clamps and a compartment cable entry from the switching compartment with the formation of a cylindrical flameproof connection.

Brief Description of the Drawings

Figure 1 shows the device of the control post explosion-proof push-button, general view.

Figure 2 shows the device control post explosion-proof push-button with one button element.

Figure 3, too, with two button elements.

In figure 4, too, with three button elements.

Utility Model Implementation

The explosion-proof push-button control post device consists of a housing 1 with a cover 2 connected by captive screws (not shown in FIG.) With an encoded head, cable entry 3, button elements panel 4, device control handle 5 with a fixed bracket (not shown in FIG. ), a lever 6, wherein the panel of the control unit device is either with one button element or with two button elements, or with three button elements. The panel of push-button elements 4 is configured to carry out a switching compartment and passage clamps and at the same time acts as a wall separating the cable entry compartment from the switching compartment, forming a cylindrical flameproof connection, providing

explosion proof. The control arms 5 are made with operational inscriptions “start”, “stop”, “on”, “off”. In the "stop" position, the handle 5 is fixed with a latch of the flag type.

The explosion-proof push-button control unit is operated as follows:

When the operator acts on the lever 6, mounted on the roller of the control handle 5, the contacts of the button elements 4 are closed, when the exposure ceases, the movable parts of the button elements 4 return to their original position.

The closing and opening of the contacts of the button elements 4 is made by turning the bracket fixed on the roller of the control handle 5. The control arms 5 are made as levers with operational inscriptions “start”, “stop”, or “on”, “off”. In the "stop" position, the handle 5 is fixed with a latch of the flag type.

Control posts are made with explosion protection marking РВ ExdI and lExdIIBT5 and are intended for operation in surface and underground rooms of coal mines in accordance with the current "Safety Rules in Coal Mines", as well as in hazardous areas according to the "Rules for Electrical Installation" (PUE), chapter 7.3 "Electrical Installations in hazardous areas ”, GOST R 51330.9 and other regulatory documents that determine the applicability of electrical equipment in hazardous areas.

The explosion-proof push-button control unit has:

- explosion protection level “1” or “RV” - “explosion-proof electrical equipment”;

- types of explosion protection “d” - “flameproof enclosure”;

- explosion protection markings - PB ExdI, lExdIIBT5.

Explosion protection level "I" or "RV" - "explosive electrical equipment" and the type of explosion protection "flameproof enclosure" (d) of the post is provided by the following main measures and means:

- enclosure of normally sparking parts in flameproof enclosures of posts made of AT - 4HC press material, which has a high degree of protection against the risk of mechanical damage in accordance with GOST R 51330.0-99, withstands explosion pressure and excludes the transfer of the explosion into the environment;

- the implementation of contact electrical clamps in accordance with the requirements of GOST 10434-82;

- compliance of the electrical insulation of the product with level 1 according to GOST R 51330.20-99;

- the degree of protection of the shell from external influences IP 54;

- maximum width and minimum length of slots in flat and cylindrical flameproof joints;

- limiting the heating of the outer parts of the switch shell:

temperature does not exceed 100 ° C;

- providing reliable cable sealing with an input device;

fixing the cover of the flameproof enclosure from self-unscrewing with a special screw;

- the presence on the cover of the explosion protection marking and the warning inscription “Open, unplugged”;

- protection against corrosion of the explosion-proof surfaces of the shell posts with grease.

The proposed utility model in comparison with the prototype and other well-known technical solutions has the following advantages:

- high mechanical strength;

- withstanding explosion pressure;

- the exclusion of the transfer of the explosion into the environment;

Claims (1)

An explosion-proof push-button control station device comprising a housing with a lid connected by screws, inside of which a cable entry, a panel of push-button elements, a control handle are installed, and a housing with a lid connected by screws form an explosion-proof enclosure in which normally sparkling parts are enclosed, characterized in that that the case is made of press material AG - 4 NS, and the panel of push-button elements is configured to perform the functions of a switching compartment, passage clamps and simultaneously fulfilling the function of the wall separating the cable entry compartment from the switching compartment with the formation of a cylindrical flameproof connection.