Explosion-proof plug-and-socket

FIELD: blasting.

SUBSTANCE: explosion-proof plug-and-socket (1) comprises plug (2) and socket (3). Plug (2) comprises case (4) with at least two pins (6) arranged in plug insert (5), and socket (3) comprises case (7) with response sockets (9) arranged in socket insert (8). One of cases (4, 7) is equipped with external bush (10), which may be detachably joined to other case (7, 4). To provide for protection of "d" type, fire-resistant shell, and protection of type "e", higher safety, even prior to engagement of pins (6) into electric contact with sockets (9), between external bush (10) and other case (7, 4), the first clearance (11) is formed, and between external bush (10) and appropriate insert (4, 8) there is the second gap (12).

EFFECT: improved convenience of plug-and-socket handling, especially when disconnecting plug from socket, with preservation of its explosion-proof property.

17 cl, 2 dwg

 

The present invention relates to explosion-proof connector that contains the plug and the socket, and the plug includes a housing with at least two pin contacts mounted in the plug is completely inserted, and the socket includes a housing located in the insert return socket contacts.

This explosion-proof connector is known from DE 20013819. In order to disconnect the plug and socket from each other in a hazardous area without disconnecting the voltage until the end of their buildings interrupts the electrical contact between the pin contacts and socket contacts. For this purpose, the housing of the plug is made so that before complete separation it is held in a position in which between the housings of the plug and socket and, respectively, between the pin and socket contacts are formed by being isolated from the external environment the internal space.

This explosion-proof connector suitable for use in hazardous areas and reliably prevents a situation in which a spark that may occur when opening contacts, ignites explosive atmospheres present in the hazardous area.

With regard to DE 20013819, the purpose of this invention is an improved explosion-proof connector by simple constructive measures so that it was more convenient to apply, especially PR is the separation of the plug and socket, when saving the explosion.

This goal is achieved by the characteristics of claim 1 of the claims.

According to the invention, one of the buildings of the plug or socket contains the outer sleeve. This sleeve Rethimno connected with another body, while still trying to create or interrupt electrical contact between the pin contacts and socket contacts forms a first gap between the outer sleeve and the other of the housing and a second gap between the outer sleeve and the corresponding insert, i.e. by inserting a plug or insert the outlet to provide protection type d, creating fire-resistant shell, and the protection of type e, increased safety, respectively.

Thus, with the outer sleeve, you can easily connect the plug with the socket, and with two gaps guaranteed safety from explosion, because the space inside the connector, which may be filled with a potentially explosive atmosphere, communicates with the space outside of the connector only through these gaps.

To provide a simple detachable connection between the outer sleeve and the other connector housing, the outer sleeve may be made in the form of a threaded sleeve with an internal thread at its screwed end. Between this internal thread and the other housing is formed corresponding to the first gap.

The outer sleeve or threaded vtalk which may be part of the fork. However, the connection and disconnection of the plug and socket are easier if the outer sleeve is part of the housing outlet and mounted to rotate relative to the insertion socket. This is due to the fact that the electrical outlet is usually fixed on any device in a hazardous area, and return the plug can bring to the outlet and to connect with it, for example in the case of connecting the movable cable.

For reliable electrical isolation of the nesting contacts from each other, and so that when used in a hazardous area, they can be connected with the corresponding electrical contact elements, the insertion of the socket can be made of plastic and filled in around the socket contacts and the electrical contact elements to ensure the integrity and fire resistance. Such electrical contact elements are, for example, the cable is placed in it contact wires.

To create a second gap in a safe manner, especially in relation to its width and shape, the insert sockets on its outer surface facing the inner surface of the outer sleeve may have a metal ring, and the second gap may be formed between this ring and the inner surface of the sleeve.

In another embodiment of the invention the insert sockets and in the organization of the plug can be made from plastic, and breeding and pins installed in the plastic movably with the education explosion-proof gap. The result is a floating sealing pins or contacts, which is also possible if the gap has a maximum width allowable current standards. Through such backlash can be compensated radial tolerances for processing.

Radial compensation may also be provided with elastic contact inside the socket contacts.

It is advantageous if the outer surface of the insertion of the socket facing the inner surface of the sleeve, forms a second gap in a particular area directly with the inner surface of the sleeve.

For accurate fixation of the metal ring relative to the insertion socket insert socket in the area of the metal rings can be made with protruding radially outward annular flange, on which rests the lower surface of the horizontal shelf of the T-shaped profile, facing away from the inner surface of the sleeve. The size of the ring flange in the longitudinal direction of the insertion sockets may correspond to the width of the horizontal shelves.

In order to stem nut cannot be removed by inserting the socket, the internal thread of the threaded sleeve can be carried on its screw end to the metal ring. Thread, e.g. the measures thanks to the contact with the metal ring does not threaded sleeve to slide and holding it with the possibility of rotation can be provided, for example, by an annular flange protruding radially inward and reaching the outer surface of the insertion sockets.

When the metallic ring can be installed between the internal thread of the threaded sleeve and the annular flange.

To simplify construction, the plug may have an essentially Cup-shaped form with an external thread at the free end. In this case, the plug can be inserted into the threaded sleeve and screwed to it, forming a plug connection. Thus, the first gap is created between the threads.

To the first gap was created before the formation of the electrical contact between the pin and socket contacts insert outlet passes in the direction of pins at correspondingly greater length, so that when you screw the sleeve on the plug pins are already inserted in the insertion holes of the socket, but still do not reach into these holes to the socket contacts are in electrical contact with them.

For reasons of explosion preferably, the plug and the outer sleeve were made of metal, at least in the zone of the thread. This applies to N. the outer sleeve, which in the zone of the metal ring is also preferably made of metal.

For electrical insulation pins relative to the metal housing of the plug at least between the plug and the plug-in stabs as you insert the plug can be installed insulating sleeve.

In order to make electrical contact pins inside the insulating sleeve is simple and safe way between it and the electrical wires going to pin contacts can be coated with plastic to ensure tightness and fire resistance.

In order, if necessary, the plug can be easily attach other means, its housing may have a screw end opposite its free end, and through this coil the end of the pass electrical wires, covered with plastic for tightness and fire resistance.

To simplify the docking pin and socket contacts the free end of plug housing can be located flush with the ends of the pins. In this case, the pins are clearly visible and easily inserted into the corresponding insertion holes of the socket and socket contacts. This operation can be further simplified if the insert socket is of the screwed end of the threaded sleeve.

The proposed R is them in principle can be made from plastic with inserted metal parts to form a gap, made of solid plastic or metal threaded bushings. For example, parts having threads made of metal, and the inner parts of insulating plastic. It is also possible connector, made entirely of plastic. While the incorporation of conductive parts in the insulation material must be performed in accordance with the applicable rules.

Described in more detail below variant embodiment of the invention with reference to the drawings, where

figure 1 shows a longitudinal section of explosion-proof connector according to the invention, separated from each other by the plug and Jack and

figure 2 is a longitudinal section similar to figure 1, with the plug partially inserted into the socket.

Figure 1 shows a longitudinal section of the connector 1 according to the invention. Slot 1 contains the plug 2 and the socket 3, which in figure 1 are disconnected from each other. The plug 2 includes a metal casing 4 is approximately Cup-shaped form. The body 4 of the plug has at its free end 25 of the outer thread 24, and the threaded end 29 opposite the free end 25, the section of reduced diameter, on which also has a male thread. This screw end 29 is filled, ensuring tightness and fire resistance, plastic 28 surrounding the electric wire 27. Electrical wires pass through flooded PLA is tmass 28 to the contact pins 6, they are electrically connected. Plastic 28 in the area of the respective ends of the contact pins 6 is an insulating sleeve 26 forming the insert 5 plugs, made of an electrically insulating plastic. The insulating sleeve 26 surrounds the ends of the pins 6 and electrically insulates them from each other.

Pins 6 protrude from the insulating sleeve 26 in the direction of the free end 25 of the housing 4 of the fork and are flush with this free end 25.

The housing 7 of the socket 3 is the outer sleeve 10, having on its inner surface 17 (see also figure 2) internal thread 14, which pass from the screwed end 15 to the metal ring 19. At its end opposite spin on the end 15, the outer sleeve 10 has a protruding radially inward annular flange designed to hold can be rotated relative to the insert 8 sockets. Insert 8 sockets made of plastic, which is filled with ensuring the tightness and fire resistance, socket contacts 9 and the electric contact elements 16 for socket contacts. In the area of the metal ring 19 (see also figure 2) on the outer surface 18 of the insert 8 outlet is made protruding radially outward annular flange 22 that is in contact with the inner surface 23 of the metal ring 19. Metal to which ICO 19 has a cross section essentially T-shaped profile with a horizontal shelf 20 and the vertical shelf 21. A horizontal shelf 20 of the T-shaped profile has a bottom surface 23, and the vertical shelf 21 is filled plastic to attach to the insert 8 sockets.

Between the inner surface 17 of the sleeve and the top surface of the horizontal shelf 20 is formed in the second gap 12, and between the external thread 24 of the fork 2 and the housing 4, on the one hand, and the internal thread 14 of the outer sleeve 10, on the other hand, formed the first gap 11, see figure 2. These two gap, each of which is located between the respective metal surfaces, do not let slip the spark that may occur inside the connector 1. Therefore, the proposed connector can be used in hazardous areas and gaps 11,12 ensure compliance with the criteria "fireproof shell d" or "increased safety e", respectively.

Insert 8 sockets includes socket contacts 9, the number and location of which corresponds to the number and location of pins 6. The inner bore 31 in box 8 of the socket opened by pins 6, finished in first contact.

Figure 2 pins 6 though and inserted into the holes 31, but not yet entered in electrical contact with socket contacts 9. When such partial insertion of the plug 2 into the socket 3, the electric current is still missing, but the gaps 11 and 12 have been formed.

Connect the s fork 2 with the outlet 3 through the outer sleeve 10, made in the form of a threaded sleeve 13, which is screwed with its internal thread 14 on the outer thread 24 of the housing 4 of the fork. When the screw threaded sleeve 3 to the body 4 of the plug pins 6 and socket contacts 9 are approaching each other up until the ends 30 of the pins 6 will not come into contact with the metal socket contacts 9 to establish the electrical connection. After screwing the pins will be inserted into the socket contacts 9 to the extent possible. The insert operation can be performed to lock the free end 25 protruding radially outward flange 22 or the metal ring 19. For this purpose, the internal thread 14 of the threaded sleeve 13 is made on site from spin-on end 15 almost to the metal ring 19.

Insert 8 sockets made of plastic, which is filled around the socket contacts 9 and the respective electrical contact elements 16, such as a cable.

Explosion-proof connector according to the invention allows to break the electrical connection between plug and socket without disconnecting from the power source and without the involvement of qualified personnel. For this purpose it is necessary to establish or after separation of the electrical connections between the pin and socket contacts already would what about the formed or still remained the connection between the housings of the plug and socket connector, and the space inside the connector was reported with the space outside of the connector only through the first and second gaps, whereas all other parts of the connector hermetically enclosed in plastic with providing fire resistance.

The first operation Assembly connector consists of screwing one thread to another. This creates a fire-resistant shell for space, where the contact elements. The contact between the pin and socket contacts is achieved in the subsequent screw. Electrical arcing can ignite gases that may be present inside the enclosure, but provided clearances and mechanical strength fire-resistant shell to prevent ignition of the surrounding gas atmosphere.

1. Explosion-proof connector (1)containing the plug (2) and outlet (3)and plug (2) includes a housing (4) at least two pin contacts, (6), mounted in box (5) plug and socket (3) includes a housing (7) with the response socket contacts, (9), mounted in box (8) of the socket, wherein the plug has an external thread, and housing (7) of the socket has an outer sleeve (10)having an internal thread and is made with the possibility of permanent connection by screwing the housing (4) of the fork with the formation of a first gap (11) between the internal thread (14) violated the Noah sleeve (10) and external thread (24) of the housing (4) of the fork and the second gap (12) between the outer sleeve (10) of the socket and insert (8) before the introduction of the pins (6) in electrical contact with socket contacts, (9), so between the housings of the plug and socket and, accordingly, the pin and socket contacts is formed essentially isolated from the external environment the internal space to provide protection type "d" creating fire-resistant shell and protection type "e" increased safety, respectively, and the outer sleeve (10) and the housing (4) plugs are standard right hand threads, respectively, as an internal thread (14) and external thread (24).

2. Explosion-proof connector according to claim 1, characterized in that the insert (8) of the socket is made of plastic and filled in around the socket contacts, (9) and the electrical contact elements (16) to ensure tightness and fire resistance.

3. Explosion-proof connector according to claim 1 or 2, characterized in that the insert (8) of the socket is made of plastic and socket contacts, (9) is movably with the education explosion-proof gap.

4. Explosion-proof connector according to claim 1 or 2, characterized in that the insert (5) of the plug is made of plastic and pins (6) is movably with the education explosion-proof gap.

5. Explosion-proof connector according to claim 1 or 2, characterized in that the insert (8) sockets on its outer surface (18)facing the inner surface (17) of the sleeve has a metal ring (19), and the specified second gap (12) is formed between this is olicom and the inner surface (17) of the sleeve.

6. Explosion-proof connector according to claim 1 or 2, characterized in that the outer surface of the insert (8) of the socket facing the inner surface (17) of the sleeve forms a second specified gap (12) in a particular zone directly with the inner surface (17) of the sleeve.

7. Explosion-proof connector according to claim 5, characterized in that the insert (8) outlet in the area of the metal ring (19) has a protruding radially outward annular flange (22)on which its bottom surface (23), facing away from the inner surface (17) of the sleeve rests a horizontal shelf (20) T-shaped profile.

8. Explosion-proof connector according to claim 5, characterized in that the internal thread (14) of the threaded sleeve (13) passes from the screwed end (15) to the metal ring (19).

9. Explosion-proof connector according to claim 1 or 2, characterized in that the housing (4) of the fork has an essentially Cup-shaped form with the specified external thread (24) at the free end (25).

10. Explosion-proof connector according to claim 1 or 2, characterized in that the housing (4) of the fork and the outer sleeve (10) is made of metal at least in the area of the thread (14, 24).

11. Explosion-proof connector according to claim 1 or 2, characterized in that at least between the body (4) plug and pin contacts, (6) installed insulating sleeve (26), serving as the insert (5) fork.

12. Explosion-proof connector according to claim 11, from which causesa fact, between the insulating sleeve (26) and power cords (27)going to pin contacts, (6), filled plastic (28) to ensure tightness and fire resistance.

13. Explosion-proof connector according to claim 1 or 2, characterized in that the housing (4) of the plug has a screw end (29)opposite to its free end (25), and screw through the end of (29) are the electrical wires (27), covered with plastic (28) to ensure tightness and fire resistance.

14. Explosion-proof connector according to claim 1 or 2, characterized in that the free end (25) of the housing (4) of the plug is flush with the ends (30) of pins (6).

15. Explosion-proof connector according to claim 1 or 2, characterized in that the insert (8) of the socket is of the screwed end (15) of the threaded sleeve (13).

16. Explosion-proof connector according to claim 1 or 2, characterized in that the part having a thread made of metal, and the inner parts of insulating plastic.

17. Explosion-proof connector according to claim 1 or 2, characterized in that it's all made of plastic.



 

Same patents:

FIELD: blasting.

SUBSTANCE: explosion-proof plug-and-socket (1) comprises plug (2) and socket (3). Plug (2) comprises case (4) with at least two pins (6) arranged in plug insert (5), and socket (3) comprises case (7) with response sockets (9) arranged in socket insert (8). One of cases (4, 7) is equipped with external bush (10), which may be detachably joined to other case (7, 4). To provide for protection of "d" type, fire-resistant shell, and protection of type "e", higher safety, even prior to engagement of pins (6) into electric contact with sockets (9), between external bush (10) and other case (7, 4), the first clearance (11) is formed, and between external bush (10) and appropriate insert (4, 8) there is the second gap (12).

EFFECT: improved convenience of plug-and-socket handling, especially when disconnecting plug from socket, with preservation of its explosion-proof property.

17 cl, 2 dwg

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