JP5274693B1 - Power cable connector - Google Patents

Abstract

[PROBLEMS] To solve the weak points of a conventional power cable connector, for example, it takes a long time to connect, 2 requires special tools such as 2 hydraulic equipment, 3 there is a risk of slackening, and 4 connections have moisture. Power cable connector that solves well-balanced problems such as passing 5 connectors that cannot be reused, or that power cables must be cut for reuse, and poor routing performance during 6 connections. I will provide a.
As a power cable connector 20, a hole is made in the center part of both ends of a metal conductor rod leaving a partition, and a power cable 1a can be inserted into the hole, and the outer periphery of the part is provided. The tapered male screw 31a is cut and a plurality of axial slits 34a are provided so that the core wire is tightened by the cap nut 21a. In this way, the connector can be used repeatedly and can be easily and reliably tightened, and has a moisture barrier property and a slim connector with no protrusion.
[Selection] Figure 2

Description

  The present invention relates to a connector for connecting a power cable (electric wire).

  Conventionally, as a method of connecting a power cable, there is a method called a direct connection method (for example, Non-Patent Document 1) shown in FIG. There are also a method using the thick sleeve 3A shown in FIG. 12 (for example, Non-Patent Document 1) and a method using the C-type connector 4 shown in FIG. 13 (for example, Non-Patent Document 1).

  Moreover, there exists a method (for example, patent document 1) using the animal power connector 5 shown in FIG. This Patent Document 1 aims to improve the animal power connector 5 of FIG.

  Alternatively, as shown in FIG. 15, there is a method of using a thick hexagonal sleeve 3 </ b> B to fix the core 1 of the power cable inserted into the sleeve with a screw 10 from the side (for example, Patent Document 2). Further, as a structure similar to FIG. 15, there is a structure as shown in FIG. 16 (for example, Patent Document 3).

  Alternatively, as shown in FIG. 17, there is a method in which a power cable is fastened and connected using a fastening member having a tapered end surface called a collar 62 (for example, Patent Document 4).

  Alternatively, as shown in FIG. 18, connection using a crimp terminal 7 (for example, Patent Document 5) is also possible. This Patent Document 5 relates to the improvement of the crimp terminal, not the cable connection, but is shown for reference.

  Hereinafter, these various joining methods will be compared. A list of results is shown in Table 1.

  First, in the oldest direct connection method shown in FIG. 11, the insulation coating 2 is removed, and the cores 1 appearing from the inside are wound and connected to each other. The core wire 1 usually uses copper as a metal conductor, but may be aluminum.

  The direct connection method shown in FIG. 11 is a reliable method if it is performed as specified, but skill is required for winding the core wire. Moreover, it is a time-consuming work, and nowadays it is a connection method that can be avoided if there is a shortage of skilled technicians.

  Therefore, at present, as shown in FIG. 12, the core 1 of the power cable is inserted into the cylindrical sleeve 3A, and then the power cable is connected by hydraulic caulking, or as shown in FIG. A method of connecting a power cable by caulking the sleeve 4 having a cross section with hydraulic pressure is often used.

  Although the method using caulking is quite reliable, it has a drawback that it cannot be removed. In other words, there is no problem if it is used semipermanently, but it is wasteful in the case of temporary construction. Also, heavy equipment must be transported.

  In the animal power connector 5 of FIG. 14, a tightening structure using a nut 53 is incorporated, and the power cable can be attached and detached. However, it is used only in limited places because of its complicated structure and high price. For example, there are cases where the device must be replaced periodically, and therefore the power cable needs to be reconnected each time.

  FIG. 15 shows fixing the power cable from the outside of the thick hexagonal sleeve 3B with screws 10. This Patent Document 2 is a device that has a structure in which a thin copper tube sleeve (not shown) is fitted to a core wire in advance in order to improve the reliability of this technique, in particular to prevent loosening.

  Such a screwing structure is often used between the power cable and the various devices 3C as shown in FIG. 16 rather than being used for connecting the power cables. Especially, it is often used with the integrated watt-hour meter, and what is shown by patent document 5 is also considered as an example of the improvement structure of the connection.

  FIG. 17 is found in Patent Document 4 and has a structure closest to the present invention described later. The method using the tapered collar 62 shown in FIG. 17 has a structure similar to the connection of gas piping and hydraulic piping, and the reliability of the connection is high. However, since the member called the collar 62 comes into close contact with the core wire 1 when completely tightened, the collar cannot be pulled out even if the cap nut 61 is loosened, and cannot be reused. In addition, since the number of parts increases, the price tends to increase.

  In FIG. 18, the crimp terminal 7 is attached to the power cable, and the crimp terminals are connected to each other by a bolt 71 and a nut 72. Since the core wire 1 and the crimp terminal 7 are usually crimped by hydraulic pressure, the reliability is high. However, when a vibration or load in a specific direction as shown in FIG. 18 is applied, the bolted portion is easily loosened. It is a construction method that should be avoided.

  As described above, there are various methods for connecting power cables, but each has advantages and disadvantages. For example, it takes time to tighten. Special tools are required. Once connected, the connector cannot be reused. Alternatively, moisture cannot be blocked from the structure of the connector. Such. These are summarized in Table 1.

  As shown in Table 1, although there are points to be considered when connecting the power cables, the present invention has been made in view of the fact that no method has been invented that can satisfy all of them.

JP2011-243359

Practical registration No. 3116115

JP2000-012121

Practical registration No. 3154708

JP 2006-221818 A

“Electrical Equipment Technical Standards / Interpretation Quick Review 2003 Revised Edition”, Ohmsha, May 10, 2004, P93

  Regarding connection time and tools in Table 1. If the connection time of the cable can be shortened, work efficiency increases. For example, the connection technology has evolved in a direction that allows easy connection even when the tool is heavy, such as hydraulic equipment. In addition, the hydraulic pressure can generate a large force and has an advantage that it can be firmly connected.

  However, it has become difficult to carry heavy equipment manually due to the recent rise in the number of buildings. In particular, the temporary construction is difficult because it is a construction in which power is not yet supplied. Therefore, in such a situation, a connector that can be used with a simple tool carried by a normal operator such as a spanner, a screwdriver, or pliers is desired.

  Regarding the tightening load drop in Table 1. As the tightening is partial, copper wires and aluminum wires having low proof stress are liable to sag, and as a result, the tightening load may be reduced. Therefore, a method of fastening the entire outer periphery of the core wire 1 as much as possible is desired.

  In other words, it is not good if there are cavities or gaps in the fastening part. This is because soft copper or aluminum escapes to the cavity due to the tightening load. Therefore, there is a concern that the tightening may be loosened unless tightened without a gap. Therefore, the operator's experience may be a thing even in hydraulic caulking. However, only the direct connection in FIG. 11 is different in the fastening principle in the sense that even if a slight sag occurs in the conducting wire, it is prevented from coming off by a frictional force.

  Recently, with the spread of cars, the vibration applied to the power cable is increasing depending on the location. This is especially true for houses built in front of large roads with heavy traffic. The connection of the crimp terminal 7 in FIG. 18 is known to be vulnerable to vibration, and is not recommended for connection between cables, but is given as an example of one connection method.

  Regarding the moisture shielding properties of Table 1. When connecting power cables, there is always a connection between wiring outside the building and wiring inside the building. In such connections, the passage of moisture can be a problem. In other words, moisture that enters from the outside of the house through the electric wire is put into the house. This phenomenon occurs due to the respiration action of the electric wires due to the up and down movement of the temperature.Especially, the electric wires installed outside the house have a large up and down movement of the temperature, so that the condensed moisture is stored inside them. It is sent to the electric wire in the house by capillary action.

  In order to cope with this, the incoming power cable and the outgoing power cable must be completely separated. However, in the current connectors, few are fully compatible. That is, in many cases, the structure is not provided with a partition wall between two cables to be connected.

  For example, although the hole of the thick sleeve 3A in FIG. 12 is not shown, the left power cable (1a + 2a) and the right power cable (1b + 2b) are temporarily covered with a waterproof covering 80. Even so, air and moisture are free. The same applies to the C-type connector of FIG. This is because in the hydraulic caulking, if the partition wall portion 32 is provided, the caulking cannot be performed well.

  The same applies to the animal power connector of FIG. In the systems of FIGS. 15, 16, and 17, the partition wall portion 32 can be provided.

  Regarding reuse of connectors in Table 1. In the case of semi-permanent use, reuse need not be considered. Rather, connection reliability is more important. However, in temporary construction, etc., attachment and removal are frequent, so a connector that can be used repeatedly is useful.

  There is also a demand for a connection method that can be reused without cutting the power cable halfway. As the price of copper rises, power cables are becoming more expensive. There is a strong need to avoid shortening the cable each time it is used.

  From this point of view, the method using hydraulic caulking is difficult to reuse and shortens each time the power cable is changed. From the viewpoint of such reuse, in Table 1, the animal power connector 5 and the screw-type sleeve connector 3B are preferable.

  Regarding the routing property of Table 1. In order to install the cable connected by the connector at a predetermined position, the power cable may be pulled on the floor or the like. In some cases, you may want to pass through the building piping. In such a case, if there is a protruding portion on the connector, the routing operation is hindered when that portion hits any corner. Or there is also a drawback that the outer waterproof tube is broken.

  Therefore, it is desirable that the connector has a shape with no corners or protrusions as much as possible. If a slim connector with an outer diameter close to that of the power cable can be obtained, the routing work can be facilitated, and even if there is a connecting portion, the power cable can be easily passed through the pipe. In particular, in the case of three-phase power, since the talk is in a state where three power lines are bundled, there is a great merit.

  As described above, the present invention mainly has six drawbacks of current connectors, (1) problems of connection time, (2) problems that require special tools, and (3) problems that may cause loosening. (4) The problem of water permeability, (5) the possibility of re-use, and (6) the problem of routing performance were carried out in a well-balanced manner.

  In order to achieve the above-mentioned object, the first solving means of the present invention provides a hole into which a power cable can be inserted from both ends of a conductive metal rod having a round cross section or a polygon cross section, leaving a partition wall portion in the center. A connector for a power cable having a structure that is opened and simultaneously provided with a tapered portion having a thread cut on the outer periphery of the metal rod, and has a plurality of slits in the threaded portion so that it can be easily tightened with a cap nut.

  The second solution means that the inner surface of the hole into which the power cable can be inserted is grooved like threading.

  A third solution is to provide a through hole in the central partition wall portion.

  In the fourth solution, a branch connector is attached to the central partition wall.

  The operation of the first solving means is as follows. First, the power cable can be reliably connected with an ordinary tool such as a spanner, and can be reused. Further, by providing the partition wall, it is possible to ensure moisture shielding. With regard to tightening reliability, a taper screw can be used to obtain a large tightening load even with a simple tool, and a structure that uniformly presses the entire outer periphery of the core wire can be taken to reduce the decrease in tightening load. Can do.

  In addition, the outer diameter can be reduced by the amount that the collar is omitted as compared with the collar in FIG. This greatly improves the routing performance.

  The effects of the second solving means are as follows. That is, the core wire 1 can be further prevented from being pulled out.

  The effects of the third solving means are as follows. In other words, if there is one spanner and one driver, a connectable means can be provided. Tightening is possible by inserting a screwdriver into the through hole in the central partition and turning the cap nut with a spanner.

  The effect of the fourth solving means is that a branching power cable can be easily attached.

The example of the connector for 22CVT is shown. The designation of dimensions is shown in FIG. Both the connector main body 20 with a taber screw and the cap nut 21 with a taper screw used the brass hexagon stick (width dimension 12mm) of the same shape as the raw material. The material is C3604. The main body of the connector was left and right, the length was 68 mm, and the length of the central part was 14 mm. The length of the taper screw part 31 was about 17 mm, and the taper angle was 2 degrees on one side. The tapered thread portion 31 was threaded with a pitch of 1 mm. The maximum outer diameter of the taper screw portion was 9.3 mm.

  The diameter of the core wire insertion hole for inserting the power cable was 5.5 mm, and a clearance from the diameter of the core wire 1 of 5.4 mm was 0.1 mm on both sides. Further, an M6 × P1 mm anti-slip screw was cut on the inner surface of the insertion hole. This screw was provided up to almost the same position as the taper screw.

The slit 34 had a width of 1 mm and a length of about 26 mm. This slit is for the bend portion 37 to bend easily when the main body is tightened with a tapered cap nut, and to easily hold the power cable. The slits were provided at four positions every 90 degrees.

  Further, since the inside can be seen through this slit, it is useful for checking whether the core wire 1 is inserted as prescribed.

  The diameter of the parallel part was 8.2 mm. The outer peripheral notch 35 has a depth of 0.4 (notch portion bottom diameter 7.4 mm) and is provided at a predetermined position. This notch makes it easy to bend the bend portion 37 and to check whether the nut is securely tightened when the cap nut is tightened, that is, to determine whether or not the nut position is in a proper position. Is provided. However, if this notch is too deep, the thickness of the lower part will become thin and there is a risk of breaking from this notch, so care must be taken.

  The cap nut 21 had a length of 16.8 mm. A screw corresponding to the taper screw of the connector body was cut on the inner surface of the nut. The taper angle and pitch were the same. The maximum diameter of the taper screw part of the cap nut is also aligned with the maximum diameter of the taper screw part of the main body. However, this does not necessarily have to be aligned.

Since the cross-sectional area of the core wire of 22CVT is 22 mm ² , if the tensile strength of the copper core wire 1 is 240 N / mm ² , the tensile strength of the entire core wire is about 5300 N. On the other hand, if the tensile strength of the C3604 bar of the connector body is about 360 N / mm ² , the minimum cross-sectional area of the outer peripheral notch 35 must be 14.7 mm ² . In the above-mentioned dimensions, both strengths are set to substantially the same level.

In other words, in the 22CVT embodiment described above, the outer diameter of the bottom of the outer periphery notch is 7.4 mm, and the outer diameter of the screw portion of the hole is 6 mm, so that the cross-sectional area of the outer periphery notch is 14.7 mm ² . Accordingly, the specification is such that the core wire 1 is broken or the connector main body is broken at the outer peripheral notch .

  When the tensile test was actually performed with an Amsler tester, the core wire was disconnected at around 3500N. Therefore, there was no destruction of the connector body. At around 3500N, it exceeds the proof stress of the core wire, and the core wire is stretched and thinned. Therefore, it is estimated that the cable was pulled out with a load lower than expected.

  Next, an example of a connector for 150 CVT will be given. The material used was a brass hexagonal bar (width dimension: 23 mm) similar to 22CVT. The length of the connector main body was 98 mm, and the length of the central part was 20 mm. The length of the taper screw portion was about 24 mm, and the taper was 2 degrees on one side. The taper portion was threaded with a pitch of 1.5 mm. The maximum outer diameter of the taper screw portion was 21.4 mm.

Since the outer diameter of the core wire of the 150CVT electric wire was 14.1 mm, the diameter of the hole for inserting the power cable was 14.3 mm, and the clearance from the core wire was 0.2 mm on both sides. Further, an M15 × P2 mm screw was cut on the inner surface of the insertion hole. Since the screw on the inner surface of the insertion port is intended to prevent slippage of the core wire, it may be anything as long as the cross section is uneven.

  The slits 34 had a width of 1.5 mm and a length of about 38 mm, and were provided at six locations every 60 degrees.

The diameter of the parallel part was 19.8 mm. The outer peripheral notch 35 has a depth of 0.5 and is provided at a predetermined position. Therefore, the cross-sectional area of the notch was 116.9 mm ² and the calculated tensile strength was 42000 N.

  The cap nut 21 had a length of 24 mm. The material used is the same as the connector body 20. A screw corresponding to the taper screw of the connector main body 20 was cut on the inner surface of the nut. The taper angle and pitch were the same as the main body.

Since the cross-sectional area of the 150 CVT core wire is 150 mm ² , if the tensile strength of the copper core wire is 240 N / mm ² , the tensile strength of the entire core wire is about 36000 N. Therefore, in this case, the minimum cross-sectional area of the notch portion 35 must be 100 mm ² in calculation, but as described above, the strength of the connector main body is made higher in this embodiment as well.

  When the tensile test was actually performed with an Amsler tester, the core wire was lost at about 16000N. Therefore, there was no destruction of the connector body. From the viewpoint of the predicted tensile strength of 36000N for the entire core wire, the load was still low. It was speculated that the effect of proof stress was also produced.

  As described above, although the core wire 1 has not been broken (it is unclear whether or not such a phenomenon actually occurs), it has been found that this tapered threaded connector also functions properly.

Tightening was possible without problems by using two normal spanners and tightening the main body and cap nut. Even tightening using one spanner and one screwdriver can be performed by inserting a screwdriver into the through hole 30 for tightening the connector body and turning the cap nut with a spanner .

  Regarding attachment / removal, it was carried out 5 times, but it was also found that it was able to withstand repeated use with only slight deformation. Since the bend is elastic, the diameter bent inside is restored when the cap nut is removed. Therefore, the core line was also removed without problems.

  As mentioned above, when mounting and dismounting, if you increase the number of times, a slight deformation can be seen, but can this be eliminated, whether the removal load of the core wire can be further increased, or can it be tightened with a lower torque? There is still room for the best dimensional specifications. Therefore, it should be noted that the above embodiment is merely an example of the present plan.

  In this embodiment, a brass hexagonal bar is used. However, even if this is a round bar, for example, it is similarly established by providing a notch for a spanner. Of course, if the electrical conductivity is good to some extent, this connector can be formed with other materials. In particular, in the case of a cap nut, there is no problem even if it is made of steel if electric corrosion is taken into consideration. Rather, there is an advantage that slimming can be achieved.

  Although detailed descriptions of dimensions, angles, etc. are omitted, as shown in FIG. 5, the end of the hole is chamfered. The image is almost as shown in these figures. The chamfer 40 at the tip of the inner surface of the main body 20 hole and the chamfer 41 at the tip of the cap nut 21 hole are for facilitating the insertion of the core wire 1. By doing this, even if there is a problem such as occurrence of burrs when the core wire is cut or the core wire is loose, it is possible to insert the core wire to a certain extent.

  Further, as shown in FIG. 6, chamfers such as 42 and 43 are provided at various locations outside the connector main body 20, and chamfers such as 44, 45 and 46 are also provided at various locations of the cap nut. Although detailed description of dimensions and angles is omitted, it is almost like the image of FIG.

  By doing so, as shown in FIG. 5, when the waterproof coating 80 is attached, there is no edge portion, and the cable can be worked without being caught even when the cable is pulled on the construction site, and the frequency with which the waterproof cover is damaged. Is also significantly reduced.

Further, since the partition wall portion 36 is provided in the central portion, there is no problem of moisture intrusion. Of course, it goes without saying that the waterproof coating also needs to be solid. Usually, a heat-shrinkable tube is often used as the waterproof covering material, but this tube has good adhesion to the connector main body.

  Also, as shown in FIGS. 8, 9, and 10, the branch structure can be easily set. In this case, half (only one side) of the connector with a taper screw according to the present invention may be attached, or a screw-type thick sleeve as shown in Patent Document 2 may be attached.

Needless to say, in taking such a branch structure, different sizes of power cables may be attached. The number of branches can be one or two. In addition, it is effective to cut a female screw in the connector main body 20 in advance and screw the male screw provided in the branch main bodies 20c and 20d into the connecting body 20 at the construction site. Is known from the beginning, it is possible to weld, braze, or solder the branch bodies 20c , 20d, etc. to the connector body 20 .

  As described above, the present invention has been achieved as a method for solving various problems that could not be achieved to date. However, there is concern that the price will be higher than that of thick-walled sleeves and C-type connectors, but it seems that there will be more merit, especially in temporary construction.

  However, it is natural that the structure can be made cheaper and smaller in outer diameter than the livestock connector of FIG. 14 or the connector with collar of FIG.

  The top view at the time of the fastening of the connector with a taper screw of this invention is shown.   2 shows a cross-section of a tapered threaded connector of the present invention. (A) shows the cross section of only the connector with a taper screw of this invention. (B) shows a cross-sectional view when a power cable is connected.   The AA cross section (in FIG. 2) of the connector main body with a taper screw of this invention is shown.   The perspective view of the partial cross section of the connector with a taper screw of this invention is shown.   The partial cross section of the connector with a taper thread of the present invention is shown.   The external appearance at the time of fastening of the connector with a taper screw of this invention is shown.   A sectional view of a waterproof covering structure is shown.   The appearance of a tapered screw connector for one branch is shown.   The appearance of a tapered threaded connector for bifurcation is shown.   The appearance of a tapered screw connector for one branch is shown.   Shows the appearance of direct connection.   The appearance when connected by the compression sleeve method is shown.   Appearance when connected with a C-type connector.   The front view when it connects with the animal power connector is shown.   Appearance when screwed with a hexagonal sleeve.   Sectional drawing of the connection of a power cable and an apparatus is shown.   Sectional drawing of the connector using a taper-shaped collar is shown.   Appearance when connected using crimp terminals.   The explanatory drawing of a dimension is shown. (A) The explanatory drawing of the dimension of a main body is shown. (B) An explanatory view of the dimensions of the cap nut is shown.

DESCRIPTION OF SYMBOLS 1 Core wire 1a Core wire on the left side of drawing 1b Core wire on the right side of drawing 1c Core wire of branch line 1d Core wire for branch 2 Insulation coating 2a Cover of power cable on left side of drawing 2b Cover of power cable on right side of drawing 2c Cover 2d Cover of branch line 3 Thick sleeve 3A Crimp type thick sleeve 3B Screwed type thick sleeve 10 Hexagon socket screw 3C Power equipment hole 11 Connection terminal 4 C-type connector 5 Livestock connector body 51 V groove pinching Pressure piece 52 T-shaped clamping piece 53 Large nut 6 Colored connector body 61 Colored connector cap nut 62 Color 63 Thin copper tube sleeve 7 Crimping terminal 7a Drawing left side crimping terminal 7b Drawing right side crimping terminal 71 Bolt 72 Nut 73 Washer 20 Connector Body with Tapered Screw 20c Taper Screw Connector for Branching 20d Branching Teeth Par screw connector 21 Cap nut with taper screw 21a Cap nut shown on the left side of the drawing 21b Cap nut shown on the right side of the drawing 21c Cap nut on the branch wire 21d Cap nut on the branch wire 30 Tightening through-hole 31 Tightening taper screw 31a Drawing Tightening taper screw 31b shown on the left side Tightening taper screw 32 shown on the right side of the drawing 32 Cable insertion hole 32a Cable insertion hole shown on the left side of the drawing 32b Cable insertion hole shown on the right side of the drawing 33 Non-slip screw 33a Shown on the left side of the drawing Non-slip screw 33b Non-slip screw 34 shown on the right side of the drawing Slit 34a Slit shown on the left side of the drawing 34b Slit shown on the right side of the drawing 35 Outer peripheral notch 35a Outer peripheral notch shown on the left side of the drawing 35b Outer peripheral notch shown on the right side of the drawing 36 Bulkhead part 37 Bend part 40 Chamfering of hole of connector body with par thread 41 Chamfering of hole of cap nut with taper screw 42 Chamfering of outer end of connector body with taper thread 43 Chamfering of outer periphery of connector body with taper thread 44 Connector with taper screw Chamfering 45 on the outer end of the cap nut Chamfering on the outer end of the connector nut with a taper thread 46 Chamfering on the outer periphery of the connector nut with a taper screw 80 Waterproof coating 81 Waterproof coating fixing band

Claims (4)

In connector power cable from both ends of the metal rod, a hole (32) for inserting a core wire of the power cable leaving the septum portion (36) in central fraction, at the same time the outer periphery of both end portions of the metal bar tapered thread portion consisting of taper portions threaded (31) is provided Rutotomoni, and the tapered threaded section connector body in the axial direction of the slit (34) has a plurality of provided in (20), corresponding to the tapered threaded section A connector for a power cable having a structure in which the core wire (1) inserted into the hole ( 32) is tightened with a cap nut (21) whose inner surface is threaded. 2. The power cable connector according to claim 1, wherein an outer peripheral notch is formed at each end of a taper screw portion having a taper portion cut at the outer periphery of both end portions of the metal rod . Wherein said partition wall portion provided in a central portion of the connector body (20) (36), through holes (30) connector for power cable of claim 1, wherein provided for tightening with a tool. The power cable connector according to claim 1 or 3 , wherein a branch connector can be attached to the partition wall portion ( 36 ) provided at a central portion of the connector body (20).

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