RU2630433C2 - Suite of inserts for sealing switching unit outputs, switching unit and sealing method - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: suite of inserts for sealing the switching unit outputs is provided. This suite is adapted for use with the switching units that have a body frame with the conductor entry, a conductor screw clamp and a through-hole, which is opposite to the screw head that forms this screw clamp. There is a slot of an L1 length, W1 width and H1 height between the mentioned through-hole, which is opposite to the screw head, and the mentioned screw head. This slot is a such one that the right-angle prism, which is inserted into the volume of this slot, blocks the access to the head of the mentioned screw, which comprises the platelike inserts.

EFFECT: after the breaking flange feeding through and the inserts ends joining, it is not allowed to remove them out of the slot without this string or wire destruction, which is easy to detect.

17 cl, 5 dwg

Description

FIELD OF THE INVENTION

The invention relates to the field of electrical engineering.

BACKGROUND

The disadvantage of switching devices containing a housing, connecting clamps into which conductors of electric circuits and means for fixing conductors in clamps made in the form of screws are inserted (Fig. 1) is the possibility of free access to means of fixing conductors, and, therefore, there is the possibility of unauthorized changes switching electrical circuits.

There are various designs of switchgear housings containing means for sealing contacts (see RF patents for utility model No. 57543, 64006, 81407, 113867, 116736 and foreign patent publications No. FR 2442495, CN 203277238, CN 202977328, CN 201215792, CN 204144183 , CN 203931978, CN 203882922, CN 203882919, CN 104064415, CN 203277238, CN 102820175, CN 201032622, JP 2000076978 and JPH 07211219).

A known protective element for the case of a circuit breaker containing connecting clamps with means for fixing the conductors in them, which is made in the form of a plug with a rectangular flat front panel and a latch entering the hole of the means for fixing the conductors, the latch made in one piece with a plug (RF patent for log model No. 81407), and the means of unauthorized access is a thread that is threaded through an opening in the plug and in the housing.

A disadvantage of the known security element is that in order to prevent unauthorized access, it is necessary to include two hinges with holes located exactly on the sides of the response loop in the plug in the housing structure. Thus, the known protective element is not suitable to prevent unauthorized access to the contacts located in the cases of circuit breakers of the most common designs. Despite the popularity of a large number of designs designed to seal the contacts of switching devices, there is still a need to create alternative designs that could provide advantages compared with known structures in the manufacture of switchgear housings on some types of plastic molding equipment.

SUMMARY OF THE INVENTION

The objective of the present invention is to expand the arsenal of tools to complicate access to the means of fixation of conductors of switching devices or to make clearly visible traces indicating undesirable access to means of fixation of conductors during operation of switching devices.

The technical result, due to which it became possible to solve the indicated problem, is that when installing the second end of the first and then the second insert into the housing slot, the protrusion of the tongue of the first insert extends into the through hole in the housing, fixing it in the longitudinal direction, and through holes at the ends of both inserts are combined with each other, so that after inserting a discontinuous element into these holes and connecting their ends, these inserts cannot be removed from the slot without breaking this thread or wire, which will be easily detected mo.

The problem is solved thanks to the proposed set of inserts for sealing the terminals of the switching device, adapted for use with switching devices having a housing with a hole for the wire, a screw terminal for the wire, and a through hole located opposite the head of the screw forming this screw terminal, while between the through hole located opposite the screw head and the said screw head has a slot of length D1, width W1, and height B1, such that a direct prism is inscribed th in the scope of this slot to block access to the head of said screw, characterized in that it contains:

a first plate insert having a first end with an opening for the discontinuous element, and a second end having lateral sides of a height equal to B1, and a central tongue having a first end connected to the first end of this insert and a free second end provided with a protrusion of the mating shape with respect to the through hole in the housing of the switching apparatus, while the Central tab is made in such a way that in an undeformed state, the plane of it (the tab) of the lower surface is at an angle the upper and lower surfaces of this insert, and its (tongue) upper and lower extreme points are located between the mentioned planes of the upper and lower surfaces of this insert, while in a deformed state it (tongue) can be located so that the height between it (tongue) ) the lower surface and lower surface of this insert along its entire (tongue) length is B2, and the protrusion at its (tongue) end protrudes above the upper surface plane of this insert by a distance B3, and

a second plate insert having a first end with an opening for the discontinuous element, and a second end having a height equal to B2 over its entire (insert) length.

Further, the aforementioned set, characterized in general categories, is illustrated by the example of some particularly preferred forms of execution, providing additional benefits.

The switching device may be, in particular, a circuit breaker (including a differential one) or a residual current device.

In one preferred embodiment, said first insert has at least one longitudinal through slot located near its (insert) edge, such that its (insert) side part forms a flat spring.

Flat springs provide a tight fit of mating parts in order to prevent spontaneous loss of inserts from the housing of the switching device.

In yet another preferred embodiment, the width of said first insert is W1.

In another preferred embodiment, the length of said first insert is D1.

In one preferred embodiment, the shape of said slot is congruent in plan to the shape of said second end of the first insert.

In another preferred embodiment, said second insert has at least one longitudinal through slot located near its (insert) edge, such that its (insert) side part forms a flat spring.

In another preferred embodiment, the width of said second insert is equal to the distance between the inner surfaces of said sides of the first insert.

In one preferred embodiment, the length of said second end of the second insert is less than the length of said second end of the first insert.

In a further preferred embodiment, the distance B3 corresponds to the height of the generatrix of the side surface of said through hole.

In another preferred embodiment, said through hole and said protrusion of the mating shape are circular in plan view.

In one preferred embodiment, said first (s) and / or second insert (s) are made of plastic.

The problem is also solved due to the fact that the switching apparatus has a housing described above, with the inserts described above installed in the housing slot.

To fix the plate inserts inside the slot, a thread, cord or wire is threaded through the holes in the first end of both inserts.

The housing may have several slots, for example, two, three, four, or the number of slots may correspond to the number of contacts.

Also, the aforementioned problem is solved due to the fact that in the proposed method of sealing the switching apparatus, a switching apparatus having the housing described above and a set of inserts described above is used, wherein:

firstly, said second end of the first insert is installed in said slot so that said tongue protrusion is oriented towards said through hole and is located opposite to it,

then the second end of the second insert is inserted into the gap between the upper part of the first end of the first insert and the bottom of the inlet of the said slot, and it (the end) is moved along the slot so that the second end of the tongue is bent and the protrusion of the tongue goes inside the through holes, and the holes in said first ends of both inserts are aligned with each other,

then thread the thread, cord or wire through both holes aligned with each other and connect the ends of this bursting element with each other.

The design and use of the device of the inserts and the housing of the switching apparatus is clearly illustrated by figures 2-5 on the example of private and specific variants of embodiment (figure 1 shows the design of known switching devices for comparison).

The tearing element mentioned above may be, in particular, a thread, cord or wire.

BRIEF DESCRIPTION OF THE DRAWINGS

In FIG. 1 schematically shows a local section of the housing of the switching apparatus without contact protection in the location of the wire clip.

In FIG. 2 is a schematic cross-sectional view of a switchgear housing with inserts installed in a slot for protecting contacts in accordance with the present invention.

In FIG. 3, a top section shows a longitudinal section of the first insert according to the invention, in the middle is a side view, and from below is a top view.

In FIG. 4 presents similar to FIG. 4 images of the second insert.

In FIG. 5, the second insert according to the invention is shown from the top left (in an embodiment with two slots on the sides forming flat springs) is a longitudinal section of the first insert according to the invention, from the bottom left is a top view; on the right are similar images of the first insert (in the embodiment, with two slots on the sides forming flat springs).

The tongue in the figures is represented by a part bounded by a U-shaped slit.

The first end of the first and second inserts in the figures is represented by part of the inserts with a through hole for the bursting element, the rest is the second part of the said inserts.

The protrusion in the figures is represented by a round cylindrical element at the end of the tongue.

The slot shown in FIG. 2 is a flat longitudinal groove located between the through hole and the screw head.

Designations D1, B1, B2, B3, W1 in FIG. 2, 3 and 4 correspond to the following dimensions of the first insert, the second insert, and the slot, namely:

D1 - the length of the slot (and the corresponding part of the first insert that is inserted into it),

B1 - the height of the slot (and the sides of the first insert that is inserted into it),

B2 - the thickness of the second insert,

B3 is the height of the protrusion on the free second end of the central tongue, which (protrusion) has a reciprocal shape with respect to the through hole in the housing of the switching apparatus, Sh1 is the width of the slot (and the corresponding width of the first insert that is inserted into it).

DETAILED DESCRIPTION OF THE INVENTION

Both inserts according to the invention are intended to be installed in the housing of the switching apparatus, which, as shown in FIG. 2 has a housing with a hole for the wire, a screw clamp for the wire, and a through hole located opposite the screw head forming this screw clamp, while between the through hole located opposite the screw head and said screw head there is a slot of length D1, width W1 , and a height B1 such that a direct prism inscribed in the volume of this slot would block access to the head of the said screw

As shown in FIG. 3, the first plate insert according to the invention has a first end with an opening for the discontinuous element, and a second end having lateral sides of a height equal to B1, and a central tongue having a first end connected to the first end of this insert and a free second end, equipped with a protrusion of a reciprocal shape with respect to the aforementioned through hole in the housing of the switching apparatus, the central tab being made in such a way that, in an undeformed state, its plane (tongue) of the lower surface is located at an angle to the planes of the upper and lower surfaces of this insert, and its (tongue) upper and lower extreme points are located between the said planes of the upper and lower surfaces of this insert, while in a deformed state it (tongue) can be located so that the height between its (tongue) lower surface and the lower surface of this insert along its entire (tongue) length is B2 <B1, and the protrusion at its (tongue) end protrudes above the mentioned upper plane of the surface of this insert at a distance B3.

As shown in FIG. 4, the second plate insert according to the invention has a first end with an opening for the discontinuous element, and a second end having a height equal to B2 over its entire (insert) length.

To seal the switching device, firstly, the said second end of the first insert is installed in the said slot of the case, so that the said tongue protrusion is oriented towards the said through hole and is located opposite it, then they are inserted into the slot between the upper part of the first end of the first insert and the bottom of the input the openings of said slot the second end of said second insert, and advance it (end) along the slot so that the second end of said tongue bends, said protrusion of the tongue went inside the aforementioned through hole, and the holes in the said first ends of both inserts were aligned with each other, then a thread, cord or wire is passed through both holes aligned with each other and connect the ends of this bursting element to each other, for example, using a seal.

Access to the contacts of the switching device sealed with the above method cannot be obtained without breaking the thread, cord or wire, which will indicate the fact of undesirable access to the contacts.

Claims (21)

1. A set of inserts for sealing the terminals of the switching device, adapted for use with switching devices having a housing with a hole for the wire, a screw terminal for the wire and a through hole located opposite the head of the screw forming this screw terminal, while between said through hole located opposite the screw head and the said screw head there is a slot with a length of D1, a width of Sh1 and a height of B1, such that a direct prism inscribed in the volume of this slot would block access to the heads f of said rotor, characterized in that it comprises: a first plate insert having a first end with an opening for the discontinuous element, and a second end having lateral sides of a height equal to B1, and a central tongue having a first end connected to the first end of this insert and a free second end provided with a protrusion of the mating shape with respect to to said through hole in the housing of the switching apparatus, while the Central tab is made so that in an undeformed state the plane of its lower surface is at an angle to the planes of the upper and the lower surface of this insert, and its upper and lower extreme points are located between the mentioned planes of the upper and lower surfaces of this insert, while in a deformed state it can be located so that the height between its lower surface and the lower surface of this insert is over its length is B2, and the protrusion at its end protrudes above said upper plane of the surface of this insert by a distance B3, and a second plate insert having a first end with an opening for a bursting element enta, and the second end, having a height equal to B2 along its entire length. 2. The kit according to claim 1, characterized in that said first insert has at least one longitudinal through gap located near its edge in such a way that its side part forms a flat spring. 3. The kit according to claim 1, characterized in that the width of said first insert is equal to Ш1 in it. 4. The kit according to claim 1, characterized in that in it the length of said first insert is D1. 5. The kit according to claim 1, characterized in that it has the shape of said slot in terms of congruent to the shape of said second end of the first insert. 6. The kit according to claim 1, characterized in that the said second insert contains at least one longitudinal through slot located near its edge in such a way that its side part forms a flat spring. 7. The kit according to claim 1, characterized in that the width of said second insert is equal to the distance between the inner surfaces of said lateral sides of the first insert. 8. The kit according to claim 1, characterized in that the length of said second end of the second insert is less than the length of said second end of the first insert. 9. The kit according to claim 1, characterized in that the distance B3 in it corresponds to the height of the generatrix of the lateral surface of said through hole. 10. The kit according to claim 1, characterized in that the said through hole and said protrusion of the reciprocal form are round in plan. 11. The kit according to claim 1, characterized in that in it the mentioned (s) first and / or second insert is made (s) of plastic. 12. The kit according to claim 1, characterized in that said bursting element therein is a thread, cord or wire. 13. A switching apparatus, characterized in that it has a housing described in paragraph 1, with inserts installed in said housing slot described in any one of paragraphs. 1-12. 14. The apparatus according to claim 13, characterized in that a discontinuous element, preferably a thread, cord or wire, is threaded through the holes in the first end of both inserts therein. 15. The device according to p. 13, characterized in that its body has two of the mentioned slots. 16. A method of sealing a switching apparatus, in which a switching apparatus is used having the housing described in paragraph 1, and a set of inserts according to any one of paragraphs. 1-12, characterized in that: firstly, said second end of the first insert is installed in said slot so that said tongue protrusion is oriented towards said through hole and is located opposite to it, then, the second end of the second insert is inserted into the gap between the upper part of the first end of the first insert and the bottom of the inlet of the said slot, and it is moved along the slot so that the second end of the tongue bends and the tab of the tongue goes inside the through hole, and the holes in the mentioned first ends of both inserts combined with each other, then pass the bursting element through both holes aligned with each other, and connect the ends of this bursting element with each other. 17. The method according to p. 16, characterized in that in it the discontinuous element is a thread, cord or wire.

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