JPH017983Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a connector, and particularly to a connector equipped with a short-circuiting mechanism that can be inserted into and removed from a current circuit. [Technical background of the invention] In general, as a connector that is used to be inserted into and removed from a current circuit, the current circuit must not be opened even for a moment, and the circuit must be opened only after the connector is completely inserted into the current circuit. It is necessary to have an ordering structure to do this. In other words, when testing equipment by connecting test equipment and general electrical equipment to the electrical circuit of power transmission and distribution equipment, or when performing maintenance, inspection, or replacement of equipment, connectors are used at the connection parts to facilitate insertion and removal from the electrical circuit. It's easy. Therefore, a connector equipped with a shorting piece is used to short-circuit the contact pieces on the receptacle side of the connector. Fig. 1 is a diagram showing the state in which the conventional device is normally used, and connects the receptacle 2 of the test connector provided in the electrical equipment 1 and the electrical equipment 1 to a current transformer circuit (hereinafter referred to as CT).
2 is a test state diagram, and FIG . FIG. 3 is a current measurement state diagram of the CT circuit, and is a state diagram in which the plug 8 to which the test meter 10 is connected is inserted into the receptacle 2. The receptacle 2 shown in FIG. It consists of a shorting piece 7 provided between the contacts 4 and 4', and is housed in, for example, an insulating case. Figure 1 shows an example in which two receptacles are used, and the short circuit mechanism for the CT circuit is one.
Coil springs 6, 6' are provided to apply a pressing force to the pair of main contact pieces 4, 4', so that the main contact pieces 4, 4' are brought into pressure contact with the shorting piece 7. Furthermore, at any point during insertion and removal of the plug 8 ,
Since the CT circuit must not open even for a moment, a pair of auxiliary contact pieces 5 and 5' are provided. In FIG. 2, to explain the operation during the insertion process of the plug 8 , first, a pair of contacts 9, 9' of the plug 8 come into contact with the auxiliary contact pieces 5, 5' of the receptacle 2 , but at this point, there is still no contact. Main contact piece 4,
4' and the shorting piece 7 are in contact with each other, forming a double contact structure. When the plug 8 is further inserted from this state, the contacts 9, 9' of the plug 8 also come into contact with the main contact pieces 4, 4' and are pushed open, breaking contact with the shorting piece 7. FIGS. 4 and 5 are configuration diagrams of a conventional device having a different type. The receptacle 2' shown in FIG.
A pair of connection conductors 12, 12' and a pair of fixed contacts 13, 13' are integrated with external connection terminals 14, 14', and are housed and fixed in, for example, an insulating case. The short-circuit configuration of the CT circuit is such that a coil spring 16 is connected to a pair of fixed contacts 13, 13'.
The structure is such that the shorting piece 15 is pressed into contact with the short-circuiting piece 15. Also, on the plug 8' side, a pair of connecting conductors 1
A protrusion 18a that presses the shorting piece 15 is integrally molded with the insulator 18 of the plug 8 . FIG. 5 shows a state in which the plug 8' is completely inserted into the receptacle 2', and the projection 18a of the plug 8' presses the shorting piece 15 of the receptacle 2', and the contact of the shorting piece 15 is released. A pair of connecting conductors 12, 12' and a pair of contacts 17 of the plug 8'.
17' is shown in complete contact. [Problems in the background art] The first illustrated device having the above configuration has a pair of main contact pieces 4,
Since the contact between 4' and the shorting piece 7 is a hammer contact structure,
If there is an insulator attached to the contact surface, or depending on the type of surface treatment of the main contact pieces 4, 4' and the short circuit piece 7, the contact resistance may increase due to an oxide film, etc.
It also had the disadvantage of being unstable. On the other hand, in order to stabilize the contact, it is possible to increase the pressure on the coil springs 6, 6', but as the number of circuits increases, a large operating force is required when inserting and removing the plug. There is a limit to increasing pressure. Further, as the material for the main contact piece and the auxiliary contact piece, a material having good conductivity, such as copper or phosphor bronze, is used, but there is a limit to increasing the plate thickness because of the need to have spring characteristics. Therefore, in a connector formed with weak strength,
When a large current flows through the CT circuit, it generates heat, induces plastic deformation, and has other disadvantages, such as affecting other parts. Furthermore, this also applies to the configuration shown in Figure 4, but since the short circuit mechanism consists of a fixed part and a movable part, and the movable part receives contact pressure via a coil spring, it is weak against vibration shock. If a large impact is applied, a momentary disconnection may occur at the contact surface of the short-circuit mechanism, and there is a potential risk of the CT circuit opening. [Purpose of the invention] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a highly reliable connector. [Summary of the invention] In this invention, a pair of elastic contact pieces are housed in a case, and each of the contact pieces is attached so as to be rotatable in the circumferential direction around two supporting points, and is used as a shorting piece. The contact reliability is improved by sliding and pressing the short-circuit piece, which is configured to make contact with the short-circuit piece and is pressed by a coil spring, about two fulcrums. [Embodiments of the invention] Examples will be described below with reference to the drawings. In FIG. 6, the receptacle 19 is connected to the insulating case 20.
The connecting conductors 21, 21' are respectively fitted into the screw portions 21a, 21a', and a pair of elastic contact pieces 22, 22' are secured by tightening nuts 23, 23'. Further, the rotation prevention plates 24, 24' of the connecting conductors 21, 21' are fitted into grooves 25a, 25a' formed in the insulating case 20 and fixed with nuts 26, 26'. Furthermore, a groove 27 is provided at an intermediate position in the insulating case 20, and a coil spring 28 is fitted into the groove 27 to prevent a short circuit between the coil spring 28 and the tips 22a, 22a' of the pair of contact pieces 22, 22'. Piece 29 is placed. Contact piece 22,2
2' is made of an elastic material, and nuts 23, 2
3' to the connecting conductors 21, 21'.
In this case, although the arms 22d and 22d' are fixed with nuts 23 and 23', the fulcrums 22b and
They are elastically biased toward each other with 22b' as the center. That is, the arm portion 22d is biased counterclockwise, and the arm portion 22d' is biased clockwise. Further, the contact portions 22e and 22e', which are formed by bending the ends of the arm portions 22d and 22d', have an acute angle with the bending angle of each arm portion 22d and 22d' being smaller than 90°. (when no force is applied). On the other hand, the shorting piece 29 is located inside the groove 27 and is pushed up by the expansion force of the coil spring 28, so that the shorting piece 29 is pushed up between the contact portions 22e and 22.
A pressing force is applied to the tip portions 22a, 22a' of e' to push the arm portions 22d, 22d' open. In short, when the short-circuiting piece is pressed by the coil spring, the contact parts 22e and 22e' are urged to mutually rotate in the circumferential direction about the tip support points 22c and 22c', and this contact part 22e ,22
The arm portions 22d and 22d', which are integrated with e', are similarly biased. Note that the above-mentioned rotational movement in the circumferential direction will be described later. Furthermore, by pressing the surface 29a of the shorting piece 29 from the outside, the shorting piece 29 is attached to the insulating case 20 against the spring pressure.
A slot 30 is provided so that the connector can be moved, and a guide groove 3 is provided so that a contact of a plug (not shown) can be inserted into the connecting conductor 21, 21'.
1,31' is produced. Note that the pair of contact pieces 22, 22' described above are shaped like "arms 22d, 22' of the contact pieces."
Assuming that the length of 2d' is ₁ and the length of the contact pieces 22e and 22e' is ₂ , ₁ > ₂ . Next, the operating states will be explained in order for each case.
7 is a short-circuit state diagram of the receptacle 19 , and FIG. 8 is a diagram showing the plug 32 inserted into the receptacle 19 and the 1
Arm portions 22d, 22 of the pair of contact pieces 22, 22'
FIG. 9 shows a state where d' is not yet restrained, and the plug 32 is inserted into the receptacle 19 , and the arm portions 22d, 22d' of the pair of contact pieces 22, 22' are in contact with the side walls 34, 34' and restrained. State diagram, No. 10
The figure shows a state in which the plug 32 is completely inserted into the receptacle 19 . FIG. 11 is an explanatory diagram of the operation of the short-circuit mechanism section, and only shows the mutual relationship between the contact piece 22 and the short-circuit piece 29.
In FIG. 11, A is an elastic contact piece 22.
In the short-circuited state shown in FIG. 7, it is in the position B due to the pressing force F of the coil spring 28. In this state, the contact piece 22
rotates in the circumferential direction by θ ₁ around 22b from the original state A, and when the surface 29a of the shorting piece 29 is pushed up to the position A by the pressing force F of the coil spring 28, the tip of the contact piece 22 22a is the fulcrum 2
It rotates by θ ₂ in the circumferential direction about 2c. This state is indicated by (b). Note that the contact piece 22 that is stationary at position A tries to return to the original position A, but the condition for it to remain stationary is to satisfy F=[|−F ₁ |+|−F ₂ |]. It is in a state of equilibrium. Also, as mentioned _above1 >
₂ , the relationship |−F ₁ |<|−F ₂ | holds true. FIG. 8 shows the case where the shorting piece 29 is at the position shown by B in FIG. 11. That is, during testing, maintenance inspection, replacement, etc., the plug 32 is inserted halfway, and the protrusion 32a of the plug 32 passes through the slot 30 and is pushed to position B shown in FIG. 11. However, in this case, contact piece 2
The tips 22a, 22a' of 2, 22' are the fulcrum 22c,
It is in a state where it has rotated by θ ₂ around 22c',
At this time, the tips 22a, 2 of the contact pieces 22, 22'
2a' slides on the upper surface 29a of the shorting piece 29 by ΔP and comes to rest. Note that the pair of contacts 33, 33' of the plug 32
and the connecting conductors 21, 21' of the receptacle 19 are in contact with each other, and each of the contact pieces 22, 22'
Since the short-circuiting piece 29 and the short-circuiting piece 29 are still in contact with each other, there is a double contact and the CT circuit is never opened. FIG. 9 shows the case where the shorting piece 29 is at the position shown by C in FIG. 11. That is, the plug 32
, the protrusion 32a presses the shorting piece 29,
The state in which the tip portions 22a, 22a' of the contact pieces 22, 22' and the shorting piece 29 are about to be separated is shown. On this occasion,
The arm portions 22d, 22d' of the contact pieces 22, 22' are
From state B, it rotates by θ _one turn in the circumferential direction about the fulcrum 22b, and returns to state A. At this time, contact piece 2
The tips 22a, 22a' of 2, 22' are the shorting pieces 29
Slide the upper surface 29a by P. The sliding mentioned here is not the sliding of the contact position that is used all the time, but it is useful for improving contact reliability by not opening the CT circuit during the plug insertion process. In FIG. 10, the shorting piece 29 is connected to the protrusion 32 of the plug 32.
This is the case where it is completely pushed in by a. That is, a state is shown in which the insulating surface 32b of the plug 32 is in contact with the front surface 20a of the insulating case 20 of the receptacle 19. In this case, since the protrusion 32a of the plug 32 continues to push the shorting piece 29, the shorting piece 29 moves against the coil spring 28, and the C shown in FIG.
By crossing the position, a pair of contact pieces 22, 2
2' and the shorting piece 29 are released from contact. but,
Even in this state, the connecting conductors 21, 21' of the receptacle 19 and the contacts 33, 33' of the plug 32 are in contact with each other, and power is supplied to the electrical equipment (not shown) connected to the plug 32 . The above is an explanation of the operation of the short-circuit mechanism over time, but in the case of the reverse operation such as pulling out the plug 32 , the operation is completely reversed, so a description of this will be omitted. do. FIG. 12 is a configuration diagram of one embodiment of the contact piece. In the figure, 35 is a slit, and if one or more slits are provided, the contact with the shorting piece will be twin contact or multi-face contact, so that even higher reliability can be obtained. In addition, one of the electrical contact materials made of silver or silver alloy is attached to the tip contact part of the contact piece.
Further effects can be expected if the types are fixed by silver soldering or the like. FIG. 13 is a block diagram of one embodiment of the shorting piece, in which a plurality of lattices or meshes 35 are provided on the plane thereof. With this configuration, not only does the contact piece and the shorting piece make multi-point contact, improving the contact reliability, but even if minute dust such as insulators enters, it will not get into the groove 36 and cause contact failure. Failures can be prevented. FIG. 14 is a configuration diagram of one embodiment of the contact piece, in which the number of parts is reduced by integrally molding each contact piece 22, 22' and the connecting conductor 37, 37' with a spring material, respectively. . In the above embodiment, the pair of contact pieces 22, 22'
Although the dimensional relationship has been described as ₁ > ₂ , it is clear that it is not limited to this and may also be ₁ < ₂ . Furthermore, it goes without saying that the connector itself may be divided into a plurality of blocks and used in combination according to the purpose. [Effects of the invention] As explained above, according to the invention, when providing a contact piece having elasticity for the shorting piece attached to the receptacle side of a connector used in a current transformer circuit, the contact piece is made of two pieces. The configuration allows rotation in the circumferential direction around a fulcrum, and the top surface of the shorting piece slides when the plug is inserted or removed, improving contact reliability to prevent the CT circuit from opening during the plug insertion process. In addition, since the contact piece itself is made of an elastic material and is pressed with a spring, stable contact is possible even when plastic deformation occurs due to large currents, and current change is possible even when vibrations and shocks are applied. This prevents the container from being opened.

[Brief explanation of the drawing]

Figure 1 is a diagram of a conventional current transformer circuit connector in normal operation, Figure 2 is a test diagram, Figure 3 is a current measurement diagram of a current transformer circuit, and Figures 4 and 5 are different types. FIG. 6 is a detailed diagram of the inside of the receptacle of the connector according to the present invention; FIG.
8, 9, and 10 are diagrams showing the sequence for explaining the operation, FIG. 11 is an explanatory diagram of the operation of the short circuit mechanism, and FIG. 1
FIG. 3 is a configuration diagram of one embodiment of the shorting piece, and FIG. 14 is a configuration diagram of one embodiment of the contact piece. 1...Electrical equipment, 2 , 19 ...Receptacle,
3, 3', 12, 12', 21, 21', 37, 3
7'... Connection conductor, 4, 4', 9, 9', 17, 1
7', 33, 33'... Contact, 5, 5'... Auxiliary contact, 6, 6', 28... Coil spring, 7, 1
5, 29... Short circuit piece, 8 , 32 ... Plug, 10
...Test instrument, 11...Test power supply, 13,1
3'... Fixed contact, 14, 14'... External connection terminal, 18... Insulator, 20... Insulating case, 2
2, 22'... Contact piece, 23, 23'... Nut,
24, 24'... Rotation prevention plate, 25a, 25a',
27...Groove, 26, 26'...Inset nut,
30...Slot hole, 31, 31'...Guide groove, 34,
34'...Side wall, 35...Slit, 36...Mesh.

Claims (1)

[Claim for Utility Model Registration] A connector configured to be able to open and close a pair of contact pieces each connected to a connecting conductor supported in a receptacle by means of a shorting piece in response to the insertion and removal of a contact on the plug side. In the above, the contact piece is formed of an elastic material and has one end fixed to the base of the connecting conductor, and has a first arm biased to rotate in the circumferential direction about the fixed position as a fulcrum, and the first arm. 1
a second arm formed to bend the end of the arm and rotate in the circumferential direction about the bending point as a fulcrum, The ends of the second arm are arranged so that the bending directions thereof face each other, and the ends of the second arms are brought into elastic contact with the contact surface of the shorting piece, so that the second A connector characterized in that the end of the arm slides on the contact surface of the shorting piece. The connector according to claim 1, wherein the contact piece has one or more slits at its tip. 2. The connector according to claim 1, wherein a grid-like or mesh-like groove is formed on the plane of the shorting piece. The connector according to claim 1, wherein the connecting conductor and the contact piece are each integrally formed. 3. The connector according to claim 1 or 2, wherein one type of electrical contact material made of silver or a silver alloy is fixed to the tip of the contact piece.