JP2014116174A - Wiring duct system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring duct system capable of suppressing generation of arc discharge in a process of connecting a plug with a wiring duct.SOLUTION: A determination energization part 36 short-circuiting between determination terminals 23 of a wiring duct 2 only in a semi-connection state at a process of connection to the wiring duct 2 is provided at a plug 3 as well as a power reception contactor 31 to which power is fed via a power feeding terminal 21 of the wiring duct 2. In addition, when the determination terminals 23 are short-circuited, the presence of the plug 3 in the semi-connection state is determined by a semi-connection determination circuit 40. Accompanying this, an output voltage from a DC power supply 1 to the power feeding terminal 21 is reduced by a reduction circuit 5. Thereby, generation of arc discharge in a process of connecting the plug 3 with the wiring duct 2 can be suppressed.

Description

  The present invention relates to a wiring duct system.

  Conventionally, a wiring duct system including a wiring duct and a plug connected to the wiring duct has been provided (see, for example, Patent Document 1).

  The wiring duct is also called a lighting duct, a duct rail, or the like, and has a so-called lip groove-shaped connection recess in which the width of the end on the opening side is narrower than the width on the back side. In the wiring duct, power supply terminals made of a conductive material are held on the inner surfaces of the connection recesses facing each other in the width direction. Each power supply terminal is electrically connected to a power source and used as a power supply path.

  The plug is inserted and connected to the connection recess, and has a pair of power receiving contacts that are in contact with the power supply terminal in a one-to-one relationship.

  The plug is provided in, for example, a lighting fixture, and a load such as a light source is supplied with power through a power supply terminal and a power receiving contact. According to the wiring system using the wiring duct and the plug as described above, since the plug can be connected to an arbitrary position of the connection recess, the connection position of the plug as compared with a wiring system using a general outlet. High degree of freedom.

  Moreover, as said plug, there exists a thing which has a switch which turns ON / OFF the electricity supply to a load from a receiving contact (for example, refer patent document 2).

  Furthermore, some switch devices include a semiconductor switch connected in parallel to the main contact, and suppress the occurrence of arc discharge at the main contact by turning on the semiconductor switch when switching the main contact on and off. (For example, refer to Patent Document 3).

Utility Model Registration No. 3110925 JP-A-5-47476 JP 2009-158112 A

  In the above wiring system, when the plug is connected to the wiring duct while power is being supplied from the power supply to the power supply terminal, arc discharge occurs between the power supply terminal and the power receiving contact during the connection process. there's a possibility that. In particular, when the power source is a DC power source, arc discharge is continuous.

  When the plug has a switch as in Patent Document 2, if the switch is turned off in advance before connection to the wiring duct, it is possible to prevent occurrence of arc discharge between the power supply terminal and the power receiving contact. . However, if the operator neglects to turn off the switch as described above, arc discharge may still occur. In addition, when a mechanical switch is used as the above switch, arc discharge may occur between the contacts when the switch is turned on. In order to avoid this, when a semiconductor switch as in Patent Document 3 is provided, the number of plug parts increases and the size of the plug increases.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a wiring duct system in which the occurrence of arc discharge in the process of connection to the wiring duct is suppressed.

  The wiring duct system of the present invention includes a wiring duct having a power feeding terminal electrically connected to a DC power source, and a plug having a power receiving contact that is in contact with the power feeding terminal, and the power receiving contact is the power feeding terminal. A semi-connection determination circuit that determines whether or not the plug in a semi-connected state that is close to the power source exists, and when the semi-connection determination circuit determines that the plug in the semi-connected state exists, from the DC power source A reduction circuit for reducing an output voltage to the power supply terminal, and the half-connection determination circuit and the reduction circuit are not provided in the plug.

  In the above-described wiring duct system, the wiring duct includes a duct main body having a groove-shaped connection recess and holding the power supply terminal on each inner surface facing each other in the width direction of the connection recess, and the plug is A contact holding part that holds the two power receiving contacts so as to protrude in opposite directions and is inserted into the connection recess, and the plug projects the power receiving contacts from the contact holding part. Each of the power receiving contacts is rotated by an axis parallel to the depth direction of the connection recess after being in a semi-connected state inserted in the connection recess with the direction directed in the length direction of the connection recess. Each of the power supply terminals is connected to the wiring duct by being brought into contact with the power supply terminal, and the wiring duct has a pair of determination terminals held in the connection recess, Previous The plug includes a determination energization unit that electrically connects the determination terminals in the half-connected state and does not electrically connect the determination terminals in the connected state, and the half-connection determination circuit includes: It is determined that the plug in the semi-connected state exists when the determination terminals are electrically connected, and the plug in the semi-connected state is determined when the determination terminals are not electrically connected. May be determined not to exist.

  In the above wiring duct system, it is desirable that the determination energization section is made of one conductor.

  Furthermore, the wiring duct system may include a lamp body having an electrical light source that is turned on by power feeding through the power feeding terminal and the power receiving contact and connected to the plug.

  According to the present invention, when the half-connection determining circuit determines that there is a half-connected plug, the drop circuit reduces the output voltage from the DC power supply to the power supply terminal, so the plug is connected to the wiring duct. The occurrence of arc discharge during the process is suppressed.

It is a circuit block diagram which shows the outline of embodiment of this invention. It is a front view which shows a wiring duct same as the above. (A) (b) shows a plug same as the above, (a) is a rear view, (b) is a right side view. It is a front view which shows the state from which the front cover was removed in the plug same as the above. It is a front view which shows the half-connected state of a plug in the same as the above. It is a front view which shows the connection state of a plug in the same as the above. (A) and (b) show the energization part for a judgment same as the above, respectively, (a) is a top view, (b) is a front view. It is explanatory drawing which shows the positional relationship of each receiving contact and the electricity supply part for determination, and a power feeding terminal and the terminal for determination in each step of the process in which a plug is connected to a wiring duct. It is a circuit block diagram which shows the outline of the example of a change same as the above. (A) and (b) each show the principal part of the plug in the example of FIG. 9, (a) is a top view, (b) is sectional drawing in the AA cross section of (a). It is a perspective view which shows an example of an external appearance same as the above.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the present invention includes a wiring duct 2 having a pair of power supply terminals 21 electrically connected to an output end of a DC power supply 1 and a pair of power receiving contacts that are in contact with the power supply terminals 21 on a one-to-one basis. And a plug 3 having a child 31. Needless to say, an appropriate conductive path such as a fader 71 or a power cable 72 shown in FIG. 11 may be inserted between the DC power supply 1 and the power supply terminal 21.

  As the DC power source 1, a well-known DC power source circuit can be used in addition to a battery. Furthermore, examples of the DC power supply circuit include an AC-DC converter that converts AC power into DC power, a DC-DC converter that converts a voltage value of DC power, and the like, and a combination thereof.

  As shown in FIG. 2, the wiring duct 2 includes a duct main body 22 that has a groove-like connection recess 220 and that holds the power supply terminal 21 on each inner surface facing each other in the width direction of the connection recess 220. In the duct body 22, lip portions 221 project inward in the width direction on the inner surfaces of the connection recess 220 facing the width direction (left-right direction in FIG. 2), and the connection recess 220 is a so-called lip groove. It has become.

  Hereinafter, the vertical and horizontal directions are based on FIG. 2, and the direction orthogonal to the paper surface of FIG. 2 (that is, the length direction of the connection recess 220) is referred to as the front-rear direction. That is, the back side in the depth direction of the connection recess 220 is referred to as the upper side, and the width direction of the connection recess 220 is referred to as the left-right direction. The duct body 22 has an upper wall 222 that forms the inner bottom surface of the connection recess 220 with the thickness direction directed in the vertical direction, and protrudes downward from the left and right end portions of the upper wall 222, respectively. And two side walls 223 oriented in the direction. Each lip 221 protrudes from the lower end of the side wall 223 in the left-right direction, and the thickness direction is directed in the up-down direction. The duct body 22 is formed by covering the surface of a metal member 227 having a C-shaped cross section straddling the upper wall 222, the side wall 223, and the lip 221 with a synthetic resin 228.

  Furthermore, on the inner surface of the connection recess 220 facing the left and right above the lip portion 221 (that is, the back side in the depth direction of the connection recess 220), there are terminal holding projections 224 that are ridges extending in the front and rear direction. Projected. Each terminal holding projection 224 is provided with a groove-like recess 225 extending in the front-rear direction on the inward surface in the left-right direction, and the feeding terminal 22 made of a conductive material is stored and held in each recess 225. Has been.

  Next, the plug 3 will be described with reference to the orientation in the state in which the connection to the wiring duct 2 is completed with respect to the top, bottom, left, and right. The plug 3 has a contact holding portion 32 that holds each power receiving contact 31 so as to protrude in the left-right direction and is inserted into the connection recess 220. The contact holder 32 is provided at the upper end of the housing 30. The housing 30 includes a front cover 301 and a rear cover 302 that are made of synthetic resin and are coupled to each other in the front-rear direction. The front cover 301 and the rear cover 302 are coupled to each other by screwing with a screw 303 that passes through the front cover 301. A nut 304 into which the screw 303 is screwed is held on the rear cover 302 by, for example, fitting.

  Each power receiving contact 31 is formed by, for example, punching and bending a metal plate, and protrudes left and right from the contact holding portion 32 with the thickness direction in the vertical direction as shown in FIG. The contact portion 311 that is connected to the lower end of the connection portion 312 and the connection portion 312 that protrudes downward from the inner end of the contact portion 311 in the left-right direction with the thickness direction facing the left-right direction. And a fixing portion 313 fixed to the front cover 301 with screws.

  The housing 30 has a cylindrical main body 33 whose axial direction is directed vertically. The contact holder 32 projects upward from the center of the upper surface of the main body 33. Further, on both the left and right sides of the contact holder 32, flat-shaped flanges 34 with the thickness direction directed in the up-down direction are provided so as to project. The lower surface of the flange portion 34 faces the upper surface of the main body portion 33 with a gap therebetween.

  Further, the plug 3 includes a rotation stopper 35 attached to the rear side of the housing 30 so as to be vertically movable with respect to the housing 30. The rotation stopper 35 is made of, for example, a synthetic resin. The rotation stopper 35 protrudes upward from the upper surface of the main body portion 33 at the upper end of the movable range (hereinafter referred to as “lock position”). The rotation stopper 35 does not protrude from the upper surface of the main body 33 at the lower end of the movable range (hereinafter referred to as “unlock position”). Further, a return spring (not shown) for returning the rotation stopper 35 to the locked position is interposed between the main body portion 33 and the rotation stopper 35.

  When connecting the plug 3 to the wiring duct 2, first, each power receiving contact 31 protrudes from the contact holder 32 while maintaining the rotation stopper 35 in the unlocked position against the spring force of the return spring. The contactor holding part 32 and the flange part 34 are inserted into the connection concave part 220 with the direction directed in the front-rear direction (the length direction of the connection concave part 220), and a half-connected state shown in FIG. Next, the plug 3 is rotated 90 ° counterclockwise with respect to the wiring duct 2 (that is, around an axis parallel to the vertical direction that is the depth direction of the connection recess 220), as shown in FIG. Connected. In the connected state, each power receiving contact 31 is electrically connected to the power supply terminal 21. Each of the power receiving contacts 31 can be elastically deformed so as to reduce the projecting dimension from the contact holding portion 32, and the contact pressure of the power receiving contact 31 with respect to the power supply terminal 21 in the connected state is the power receiving contact. 31 is secured by the spring force of 31. In addition, a portion of the power receiving contact 31 that contacts the power supply terminal 21 in the above-described rotation process has a convex curved surface shape (for example, a circular arc shape in cross section) so that wear of the power supply terminal 21 is suppressed. Further, in the connected state, the flange portion 34 is sandwiched between the lip portion 221 and the terminal holding convex portion 224 in the up-down direction, so that the displacement of the plug 3 with respect to the wiring duct 2 and the up-down direction displacement is prohibited. Further, in the connected state, the rotation stopper 35 returns to the locked position, and the upper end portion of the rotation stopper 35 is sandwiched between the lip portions 221 of the wiring duct 2, thereby inhibiting the rotation of the plug 3 with respect to the wiring duct 2.

  Here, the wiring duct 2 and the plug are connected so that the plug 3 is not connected to the wiring duct 2 in such a direction that each power receiving contact 31 comes into contact with the power supply terminal 21 having the wrong polarity. 3 is an asymmetric shape. Specifically, a reverse connection prevention convex portion 226 is projected downward from the lower left end portion of the duct body 22 of the wiring duct 2. Further, the main body portion 33 of the plug 3 is shaped so as to be in close contact with the lower surface of the wiring duct 2 at a portion other than the reverse connection prevention convex portion 226, and the reverse connection prevention convex portion 226 is avoided when the connection direction is correct. A connection preventing recess 331 is provided at the upper left end (upper right end in FIG. 3A). That is, in the case of reverse connection, the reverse connection prevention convex portion 226 interferes with the main body portion 33, thereby preventing introduction of the flange portion 34 and the like into the connection concave portion 220. The reverse connection prevention concave portion 331 has a quarter arc shape as viewed from above so as to avoid the reverse connection prevention convex portion 226 continuously from the half-connected state to the connected state.

  Further, in the wiring duct 2, a pair of determination terminals 23 each made of a conductive material are held side by side on the inner bottom surface (that is, the downward inner surface) of the connection recess 220 so as to be separated from each other. Each determination terminal 23 is made of, for example, an elongated metal plate whose thickness direction is in the vertical direction and whose length direction is in the front-rear direction.

  In the plug 3, the contact holding part 32 holds a determination energization part 36 that short-circuits the determination terminals 23 in a half-connected state. More specifically, as shown in FIGS. 7A and 7B, the determination energization unit 36 is made of a rectangular metal plate that is long in the front-rear direction (the left-right direction in FIGS. 7A and 7B). Contact portions 361 that are bent so as to bulge upward and elastically contact each one of the determination terminals 23 are provided at both ends in the longitudinal direction of the determination energization portion 36. The determination energization unit 36 is provided with two crimping holes 360 arranged in the longitudinal direction. In the housing 30, the two caulking protrusions 320 that are arranged on the upper surface of the contact holding part 32 and project upward are inserted into the caulking holes 360 and caulked with ultrasonic waves, whereby the determination conductive part 36. Is coupled to the housing 30.

  That is, in the process in which the plug 3 is connected to the wiring duct 2, each power receiving contact 31 is changed from the half-connected state shown in the uppermost stage in FIG. 8 to the power supply terminal 21 as shown in the third stage from the top in FIG. Until the position where the contact starts, the determination energization unit 36 short-circuits between the determination terminals 23. Similarly, when the plug 3 in the connected state is removed, the determination energization unit 36 short-circuits the determination terminals 23. Further, the dimension of the determination energization unit 36 in the short direction is smaller than the distance between the determination terminals 23, and the determination energization unit 36 is connected to any of the determination terminals 23 in the connection state shown in the lowermost stage in FIG. 8. Do not touch. Therefore, if all the plugs 3 in which the contactor holding portions 32 are inserted into the wiring duct 2 are connected, the determination terminals 23 are not electrically connected.

  Further, in the present embodiment, the semi-connection determination circuit 40 that determines whether or not the semi-connected plug 3 exists, and the DC power source when the semi-connection determination circuit 40 determines that the semi-connected plug exists. And a reduction circuit 5 for reducing the output voltage from 1 to the power supply terminal 21. The half-connection determination circuit 40 and the lowering circuit 5 are each disposed closer to the DC power source 1 than the power supply terminal 21.

  Furthermore, the present embodiment includes a determination power supply 43 that outputs a constant DC voltage. The output voltage of the determination power supply 43 is set lower than the output voltage of the DC power supply 1, and when the output voltage of the DC power supply 1 is 24V, the output voltage of the determination power supply 43 is, for example, 5V. One determination terminal 23 is electrically connected to the output terminal on the high voltage side of the determination power supply 43 via the first resistor 41, and the other determination terminal 23 is connected to the determination power supply 43 via the second resistor 42. Is electrically connected to the output terminal on the low voltage side.

  The semi-connection determination circuit 40 determines whether or not the semi-connected plug 3 exists based on the voltage input from the connection point between the second resistor 42 and the determination terminal 23.

  When there is no semi-connected plug 3, the determination terminals 23 are not electrically connected, so the input voltage to the semi-connection determination circuit 40 is at L level. When there is a semi-connected plug 3, the determination terminal 23 is short-circuited via the determination energization unit 36 of the plug 3, so that the input voltage to the semi-connection determination circuit 40 becomes H level. Become. The half-connection determination circuit 40 compares the input voltage from the connection point with a predetermined reference voltage that is higher than the L level voltage and lower than the H level voltage. The half-connection determining circuit 40 determines that the semi-connected plug 3 exists when the input voltage is higher than the reference voltage, and the half-connected plug when the input voltage is lower than the reference voltage. 3 is determined not to exist, and a voltage corresponding to the determination result is input to the reduction circuit 5. The half-connection determination circuit 40 as described above can be realized by a known electronic circuit.

  Further, the lowering circuit 5 is interposed between the output terminal on the high voltage side of the DC power source 1 and the power supply terminal 21 and is in a period in which the half connection determination circuit 40 determines that the plug 3 in the half connection state exists. The power supply between the DC power source 1 and the power supply terminal 21 is stopped. As a result, the output voltage from the DC power supply 1 to the power supply terminal 21 is reduced to zero. The lowering circuit 5 as described above can be realized by using, for example, a known relay.

  Note that the output voltage of the DC power supply 1 is higher than that during the period in which it is determined that the semi-connected plug 3 is not present during the period in which the semi-connected plug 3 is determined by the semi-connection determining circuit 40. A DC power supply circuit that lowers the voltage may be used. In this case, since the DC power source 1 also serves as a reduction circuit, the above-described reduction circuit 5 can be omitted.

  The output voltage during the period in which it is determined that the semi-connected plug 3 is present does not necessarily have to be reduced to 0, but arc discharge occurs between the power supply terminal 21 and the power receiving contact 31. It is desirable that the voltage is lowered to a sufficiently low voltage.

  According to the above configuration, when the semi-connected plug 3 is present, the output voltage from the DC power source 1 to the power feeding terminal 21 is lowered, thereby improving safety. Further, unlike the case of trying to prevent arc discharge by the configuration of Patent Document 2, it is not necessary to turn off the switch in advance.

  If there is a semi-connected plug 3, the output voltage is reduced as described above regardless of the rotation direction of the plug 3. That is, not only when the plug 3 is connected to the wiring duct 2, but also when the plug 3 in a connected state is to be removed from the wiring duct 2, the output voltage is reduced as described above, so that safety is achieved. Improves.

  Instead of configuring the determination conductive path 36 with one conductor as described above, for example, as shown in FIGS. 9 and 10, two determination contacts each having one contact portion 361 are provided. You may comprise by the element | child 362 and the resistance 363 for determination interposed between the contacts 362 for determination. Each determination contact 362 is made of a metal plate and is fixed by caulking to the upper surface of the contact holding portion 32 at two locations. Further, the determination resistor 363 is housed in a recess 321 provided on the upper surface of the contact holding part 32 and soldered to each determination contact 362. In addition to the above, as long as the half-connection determination circuit 40 can determine energization / non-energization between the determination terminals 23, appropriate changes are possible. For example, when an AC power supply is used as the determination power supply 43, the above determination A capacitor (not shown) may be used instead of the resistor 363 for use. However, in order to reduce the number of parts and the manufacturing cost, it is desirable that the determination conductive path 36 be composed of one conductor.

  The various plugs 3 are provided in a lighting fixture 6 as shown in FIG. 11, for example. The luminaire 6 of FIG. 11 includes a lamp body 61 connected to the plug 3 through an arm 62 in addition to the plug 3. The lamp body 61 holds an electric light source (not shown) that is lit by electric power supplied through the wiring duct 2 and the plug 3. As said light source, well-known light sources, such as a light emitting diode, can be used, for example. In addition, the light source may be one that is directly input with the power supplied via the power receiving contact 31 and is turned on, or lighting that appropriately converts the power supplied via the power receiving contact 31. It may be lit by the output of a circuit (not shown). The above lighting circuit is housed and held in the lamp body 61, for example. The electrical connection between the light source and the lighting circuit and the power receiving contact 31 of the plug 3 is achieved by, for example, the power cable 63.

  In FIG. 11, each power supply terminal 21 of the wiring duct 2 is electrically connected to the DC power supply 1 via a fader 71 and a power cable 72. The half-connection determination circuit 40, the first resistor 41, the second resistor 42, the determination power supply 43, and the lowering circuit 5 may be housed in the same case as the DC power supply 1 or provided in the fader 71. May be provided, or may be provided in the wiring duct 2. When the half-connection determination circuit 40, the first resistor 41, the second resistor 42, the determination power source 43, and the lowering circuit 5 are housed in the same case as the DC power source 1, the power cable 72 has a four-core structure. Things are used. When each of the above parts is provided in the fader 71 or the wiring duct 2, a two-core power supply cable 72 is used.

  Further, one end of the connection recess 220 in the length direction is closed by a fader 71, and the other end is closed by an end cap 20 that is detachably coupled to the wiring duct 2. The end cap 20 is made of an insulating material such as synthetic resin and is coupled to the wiring duct 2 by an appropriate means such as fitting. The number of plugs 3 connected to the wiring duct 2 can be changed as appropriate. Further, a load (not shown) other than the light source may be connected to the plug 3.

  As mentioned above, although the structure of this invention was demonstrated based on the said embodiment, this invention is not restricted to the said embodiment example. For example, the structure which combined the partial structure of the said embodiment suitably may be sufficient. In addition, the materials, numerical values, and the like described in the above embodiments are merely preferable examples, and are not limited thereto. Furthermore, it is possible to appropriately change the configuration without departing from the scope of the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 DC power supply 2 Wiring duct 3 Plug 5 Degradation circuit 21 Feeding terminal 23 Judgment terminal 31 Power receiving contact 36 Judging energization part 40 Half-connection judgment circuit 61 Lamp

Claims (4)

A wiring duct having a power feeding terminal electrically connected to a DC power source, and a plug having a power receiving contact that is in contact with the power feeding terminal;
A semi-connection determination circuit for determining whether or not the plug in a semi-connection state in which the power receiving contact is close to the power supply terminal exists;
A reduction circuit that reduces the output voltage from the DC power supply to the power supply terminal when the half-connection determination circuit determines that the plug in the half-connection state exists,
The wiring duct system according to claim 1, wherein the half-connection determination circuit and the degradation circuit are not provided in the plug. The wiring duct includes a duct main body having a groove-shaped connection recess and holding the power supply terminal on each inner surface facing each other in the width direction of the connection recess,
The plug includes a contact holder holding portion that is inserted into the connection recess while holding the two power receiving contacts in a form protruding in opposite directions.
The plug is in a semi-connected state in which the receiving contact from the contact holding part is inserted into the connection recess with the protruding direction of the power receiving contact in the length direction of the connection recess, and then the depth of the connection recess Each power receiving contact is connected to the wiring duct by being connected to the power supply terminal by being rotated around an axis parallel to the direction,
The wiring duct has a pair of determination terminals held in the connection recess,
The plug includes a determination energization unit that electrically connects the determination terminals in the half-connected state and does not electrically connect the determination terminals in the connected state;
The semi-connection determination circuit determines that the plug in the semi-connected state exists when the determination terminals are electrically connected, and when the determination terminals are not electrically connected The wiring duct system according to claim 1, wherein it is determined that the plug in the half-connected state does not exist.   The wiring duct system according to claim 2, wherein the energization part for determination is made of one conductor.   4. The lamp according to claim 1, further comprising an electric light source that is turned on by power feeding through the power feeding terminal and the power receiving contact, and is connected to the plug. Wiring duct system as described in.

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