JP2011070956A - Attachment plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attachment plug capable of preventing reverse plugging, without causing it to be large-sized and which is easily positioned, when connecting it to a DC outlet. <P>SOLUTION: The DC outlet 2 has an insertion groove 27 formed around two pin-insertion holes 26 opened to the front face, with blade rests housed inside facing each pin-insertion hole 26. The attachment plug 1 is provided with two electrode pins 12, set in protrusively on the front face of a plug body 11, and a peripheral wall 13 set in protrusion on the front face of the plug body 11 so as to surround the two electrode pins 12 and inserted into the insertion groove 27 of the DC outlet 2. The peripheral wall 13 is formed into a quadrangular tube, as seen from a plug-in direction, and the two electrode pins 12 are arrayed in parallel, along an upper wall of the peripheral wall 13, arranged eccentrically at a position closer to the upper wall than to a lower wall. The plug body 11 is constituted of an inner case in which the two electrode pins 12 are fixed, and an outer case 11b made of synthetic resin, with the peripheral wall 13 integrally fitted by being subjected to secondary molding, outside the inner case. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an insertion plug that is detachably connected to a DC outlet.

  Conventionally, a DC outlet for supplying DC power to a DC device using a DC power source as a driving power source such as a radio or a telephone, and an insertion plug that is detachably connected to the DC outlet have been known ( For example, see Patent Document 1).

  The DC outlet shown in the above-mentioned patent document includes a main body housed in a switch box incorporated in a wall, and a converter that converts an AC power source into a DC power source is built in the main body. The surface of the main body facing the switch box is provided with an AC connection terminal to which the power line of the AC power source wired in the wall is connected, and the surface of the main body facing the room is connected from the DC device. An outlet portion to which a DC plug type plug provided on the wire is detachably connected is provided. Thus, when the AC power supply line is connected to the AC connection terminal of the DC outlet, the converter converts the AC power into DC power and supplies it to the outlet, and the outlet plug is connected to the DC plug. DC power can be supplied to the device.

  By the way, there is a possibility that an arc will occur when the plug is inserted into or removed from the DC outlet, and especially in the case of a DC outlet that supplies DC power, the arc is likely to persist compared to AC, so protection against the arc is necessary. However, in the DC outlet of the above-mentioned patent document, the outlet portion is composed of a pin jack type terminal, and the plug is composed of a DC plug connected to the pin jack type terminal. There is no member covering the periphery of the electrode, and there is a problem that when the arc is generated, the arc is visible from the outside.

  SELV (Safty Extra Low Voltage) standardized in the IEC standard (CEI / IEC 60906-3) as a DC outlet and a plug to be connected to the DC outlet that are protected against such an arc. There are sockets and plugs for the circuit. FIGS. 10C and 10D show the plug 110 standardized to the IEC standard, and two electrode pins 112 are arranged inside a cylindrical portion 111 provided at the tip. On the other hand, the socket 100 has a round hole 101 into which the cylindrical portion 111 of the plug 110 is inserted as shown in FIGS. 10 (a) and 10 (b). The cylindrical protrusion 102 inserted into the protrusion protrudes, and the blade receiver 104 is accommodated in the protrusion 102 so as to face the pin insertion hole 103 that opens at the tip end surface of the protrusion 102. When the plug 110 is connected to the socket 100, the electrode pin 112 inserted into the protruding portion 102 through the pin insertion hole 103 is fitted to the blade holder 104, so that power is supplied from the socket 100 to the plug 110. .

Japanese Patent Laid-Open No. 7-15835 (paragraphs [0021]-[0023] and FIG. 1)

  In the socket 100 and the plug 110 compliant with the IEC standard described above, as shown in FIGS. 10A and 10C, the two pin insertion holes 103 are on a straight line L1 passing through the center position of the protrusion 102. The two electrode pins 112 are on a straight line L2 passing through the central position of the cylindrical portion 111 and open to a position symmetrical with respect to the central position of the protruding portion 102. Since the electrode pins 112 are not inserted into the pin insertion holes 103 with the positive and negative polarities being mistaken, the key grooves 105 are formed on the outer peripheral surface of the projecting portion 102 and the cylindrical portions 111 of the cylindrical portion 111 are arranged. Ribs 113 project from the inner peripheral surface. Further, the IEC standard socket 100 and plug 110 correspond to four types of supply voltages, and in order to identify the type of supply voltage, the outer peripheral surface of the protrusion 102 has a predetermined angle with respect to the key groove 105. A voltage identification groove 106 is formed at the position, and a voltage identification rib 114 is projected from the inner peripheral surface of the cylindrical portion 111 of the plug 110 at a predetermined angular position with respect to the rib 113.

  Then, by inserting the rib 113 into the key groove 105 and the voltage identification rib 114 into the voltage identification groove 106, it is possible to prevent the plug 110 from being reversely inserted or the plug 110 having a different supply voltage from being erroneously connected. However, since the portion of the socket 100 that fits into the cylindrical portion 111 on the plug 110 side is a round hole, when the cylindrical portion 111 is inserted into the round hole 101, the plug 110 is rotated while being provided in the cylindrical portion 111. In addition, the position where the ribs 113 and 114 fit into the grooves 105 and 106 of the socket 100 has to be searched for, which is inconvenient.

  By the way, in the socket 100 and the plug 110 described above, in order to prevent the plug 110 from being inserted backward without providing the key groove 105 or the rib 113, as shown by broken lines in FIGS. The pin insertion holes 103 are arranged so as to be shifted to one side (for example, the lower side in the figure) with respect to the straight line L1, and the two electrode pins 112 are arranged to be shifted to one side (lower side) with respect to the straight line L2. However, since the cylindrical portion 111 has a cylindrical shape, if the two electrode pins 112 are arranged at a position shifted to one side from the straight line L2, the interval between the two electrode pins 112 becomes narrow, and an insulation distance is secured. In order to do so, there is a problem that the plug 110 becomes large.

  The present invention has been made in view of the above problems, and its object is to prevent reverse insertion without incurring an increase in size and to allow easy positioning when connecting to a DC outlet. Is to provide a built-in plug.

  In order to achieve the above object, the invention of claim 1 is directed to a DC outlet in which insertion grooves are formed around a plurality of pin insertion holes opened on the front surface, and blade supports are accommodated inside each pin insertion hole. A plug that is detachably connected to the DC outlet and receives DC power from the DC outlet, protrudes from the front of the plug body, and is inserted into the pin insertion hole of the DC outlet and fits into the blade socket. A plurality of round rod-shaped electrode pins that receive power supply, and a peripheral wall that protrudes from the front surface of the plug body so as to surround the periphery of the plurality of electrode pins and is inserted into the insertion groove of the DC outlet. Is formed in a square cylinder shape when viewed from the plug insertion direction, and the plurality of electrode pins are arranged side by side along a reference surface which is one inner surface of the peripheral wall and are opposed to the reference surface. Than the above group The plug body is arranged so as to be close to the surface, and the plug body is integrally formed with the fixed portion for fixing the plurality of electrode pins and the peripheral wall by secondary molding so as to cover the outside of the fixed portion. And a synthetic resin housing.

  According to a second aspect of the present invention, in the first aspect of the invention, the shape of the front surface of the plug main body surrounded by the peripheral wall when viewed from the front is at least one of the square corners according to the type of supply voltage. The shape of the corner portion of the peripheral wall is partially changed so as to have a shape obtained by cutting off the corner portion.

  In the invention of claim 3, in the invention of claim 2, the shape of the part surrounded by the peripheral wall on the front surface of the plug main body as viewed from the front is cut out from the corner of the rectangular shape opposite to the reference surface. The shape of the corner portion of the peripheral wall is partially changed so as to have a shape.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the peripheral wall is formed by extending an extension portion that protrudes from the surface of the peripheral wall, so that the type of the power supply circuit that is a power supply source is provided. Accordingly, the shape of the peripheral wall is partially changed.

  The invention of claim 5 is characterized in that, in the invention of claim 4, the extension portion is formed to extend on the inner side surface of the peripheral wall.

  The invention of claim 6 is characterized in that, in the invention of claim 5, the extension portion is provided on the opposite side of the reference surface on the peripheral wall.

  According to the first aspect of the present invention, the plurality of electrode pins to which power is supplied are arranged along the reference surface, which is one inner surface of the peripheral wall, on the inner side of the peripheral wall of the rectangular tube shape, and opposed to the reference surface. Therefore, it is possible to easily understand the direction in which the plug is inserted and connected to the DC outlet. In addition, the direction of attaching the plug to the DC outlet is restricted by inserting the rectangular cylindrical wall into the insertion slot of the DC outlet, making it easy to align the plug and preventing reverse insertion. However, an easy-to-use plug can be realized. In addition, because the shape of the peripheral wall is a square cylinder, even when multiple electrode pins are biased toward the reference plane, the distance between the multiple electrode pins will not be reduced, ensuring an insulation distance. Therefore, the insertion plug is not increased in size. In addition, since the plug body is formed by secondarily forming a housing that is integrally provided with a peripheral wall on the outer side of the fixing portion that fixes the electrode pins, the assembling work can be simplified.

  According to invention of Claim 2, the shape which looked at the site | part enclosed by a surrounding wall from the front becomes the shape which cut off at least 1 corner | angular part among square corners according to the kind of supply voltage. Since the shape of the corner of the peripheral wall has been partially changed, it is easy for the user to recognize the difference in supply voltage from the shape of the peripheral wall, and it is easy to understand the direction in which the plug is plugged into the DC outlet Therefore, it is possible to easily align the plug and the DC outlet.

  According to the invention of claim 3, the shape of the peripheral wall is such that the shape of the portion surrounded by the peripheral wall viewed from the front is a shape in which the corner opposite to the reference surface is cut out of the square corner. As compared with the case where the corners on the reference surface side where the electrode pins are biased are cut off, the distance between the electrode pins and the peripheral wall can be made longer, and the insertion is easy to manufacture. Plug can be realized.

  According to the invention of claim 4, the type of the supply voltage can be identified by the extension protruding from the surface of the peripheral wall, and the extension is formed to extend from the surface of the peripheral wall, so that it is separated from the peripheral wall. Compared with the case where it is formed, the strength of the extension can be maintained.

  According to invention of Claim 5, since the extension part is provided in the inner side of the surrounding wall, compared with the case where the extension part is provided in the outer side of the surrounding wall, it prevents that the whole plug is enlarged. be able to.

  According to the invention of claim 6, since the extension portion provided on the inner side of the peripheral wall is provided on the opposite side of the reference surface in the peripheral wall, the extension portion is extended compared to the case where the extension portion is provided on the reference surface side. A distance between the peripheral wall including the portion and the electrode pin can be increased, and an insertion plug that can be easily manufactured can be realized.

The insertion plug of Embodiment 1 is shown, (a) is the external appearance perspective view seen from the front, (b) is the perspective view which looked at the state before connecting with a DC outlet from the back. The same plug is shown, (a) is an external perspective view, (b) is an external perspective view of a state before secondary molding of the outer case. (A)-(f) is a front view of the insertion plug of Embodiment 2. FIG. (A)-(d) is a front view of the insertion plug of Embodiment 3. FIG. (A)-(e) is a front view which shows another example of an insertion plug same as the above. It is an external appearance perspective view of an insertion plug with a grounding electrode same as the above. The DC outlet to which the same plug is connected is shown, (a) is a front view, (b) is a right side view, and (c) is a bottom view partially broken. It is a system configuration diagram of a DC power distribution system in which the same plug is used. (A)-(d) is explanatory drawing when an insertion plug has a flat blade-shaped plug blade in an insertion plug and a DC outlet same as the above. The socket and plug for SELV circuits standardized by the IEC standard are shown, (a) is a front view of the socket, (b) is a sectional view of the socket, (c) is a front view of the plug, and (d) is a plug of the plug. It is sectional drawing.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The plug 1 of the present embodiment is used by being detachably connected to a DC outlet 2 embedded in a construction surface such as a wall. As shown in FIG. A plug connector for DC power is constituted by the plug 1 and the DC plug 2 to which the plug 1 is detachably connected and supplies DC power to the plug 1 side. In the following description, the arrow ab in FIG. 2A is the vertical direction, the arrow cd is the horizontal direction, and the arrow ef is the front-back direction unless otherwise specified.

  As shown in FIGS. 1 (a) and 1 (b), the plug 1 includes a horizontally long plug body 11 formed in a size that can be grasped by a hand. On the surface facing the outlet 2, two round bar-shaped electrode pins 12 for receiving power supply from the DC outlet 2 are projected and a peripheral wall 13 is formed so as to surround the two electrode pins 12. The plug main body 11 is integrally projected. In addition, an electric wire 14 from the load device is led out from the rear surface of the plug body 11, and when the plug 1 is connected to the DC outlet 2, DC power is supplied to the load device via the electric wire 14. It is like that.

  The peripheral wall 13 protruding from the front surface of the plug main body 11 is formed in a horizontally long rectangular tube shape when viewed from the plug insertion direction (front side). The two electrode pins 12 are arranged along a reference surface that is one inner surface (for example, the upper inner surface) of the peripheral wall 13 and are also an inner surface (lower inner surface) that faces the reference surface. ) Is biased to a position closer to the reference plane than. In this embodiment, the distance from the upper inner surface of the peripheral wall 13 to the electrode pin 12 is less than half of the distance from the lower inner surface of the peripheral wall 13 to the electrode pin 12, and the electrode pin 12 is at the upper side. It can be easily discriminated that it is biased. The length from the front surface of the plug body 11 to the tip of the peripheral wall 13 is set to be slightly larger than the length from the front surface of the plug body 11 to the tip of the electrode pin 12.

  Here, as shown in FIGS. 2A and 2B, the plug body 11 is secondarily formed on the outer side of the middle case 11a (fixed portion) for fixing the two electrode pins 12 and the middle case 11a. Thus, the outer peripheral wall 13 is integrally formed with a synthetic resin outer case 11b (housing). From the rear part of the middle case 11a, caulking terminals 12a electrically connected to the respective electrode pins 12 protrude outward, and the core wire of the electric wire 14 is caulked and fixed to each caulking terminal 12a. Since the caulking terminal 12a is covered with resin when the outer case 11b is secondarily molded, the charging part is not exposed. As described above, the plug body 11 is formed by secondarily forming the outer case 11b integrally provided with the peripheral wall 13 on the outer side of the inner case 11a for fixing the electrode pins 12. Therefore, the assembling work can be simplified. Can do. The middle case 11a is a member for fixing a plurality of (in this embodiment, two) electrode pins 12 with a predetermined gap therebetween while maintaining insulation. In this embodiment, a synthetic resin is used. Although the electrode pin 12 is held in the middle case 11a made of a product, the middle case 11a may not be made of a synthetic resin as long as the electrode pins 12 are insulated from each other.

  On the other hand, the DC outlet 2 to which the plug 1 is detachably connected includes a synthetic resin outlet body 20 embedded in the construction material as shown in FIGS. The outlet body 20 includes a substantially box-shaped synthetic resin body 21 having an opening on the front side and a substantially box-shaped synthetic resin cover 22 having an opening on the rear side coupled by metal assembly frames 23 and 23. Assembled. The outlet body 20 is sized in accordance with Japanese Industrial Standard (see JIS C 8303), and has a module size that can be mounted side by side on a mounting frame (see JIS C 8375) of a large-angle continuous wiring apparatus. One size is formed (this size is referred to as a module size). In addition, although the outlet fixed to the construction material will be described as an example of the direct current outlet 2 to which the plug 1 is connected, the outlet fixed to the electrical device and the cord are used for extension connection, Needless to say, the plug 1 may be connected to a multi-tap such as a cord connector body used without being fixed or a table tap used without being fixed.

  On the front surface of the cover 22, a boss portion 22 a that protrudes forward and fits in a frame of an attachment frame (not shown) is integrally projected. On the shoulder portions 22b on both the left and right sides of the boss portion 22a, center pieces of the assembly frame 23 formed in a substantially U shape are respectively placed. The both leg pieces of the assembly frame 23 are inserted into the locking recesses 22c and 21a formed on the side surfaces of the cover 22 and the body 21, respectively, and the substantially V-shaped locking claws 23c provided at the distal ends of both leg pieces are expanded. Thus, the body 21 and the cover 22 are coupled to each other by the assembly frames 23 and 23 by being engaged with the step portions on both sides of the engagement recess 21a. A pair of locking claws 23a that can be engaged with locking holes provided in a synthetic resin mounting frame (not shown) protrude from the outer edge of the central piece of the assembly frame 23, and A locking hole 23b is provided in the protruding piece protruding forward from the inner edge of the central piece, into which a locking claw of the mounting frame is engaged when mounting to a metal mounting frame (not shown).

  An outlet portion 24 to which the plug 1 is detachably connected is provided on the front surface of the boss portion 22a. The outlet portion 24 is provided at the center of the front surface of the boss portion 22a, and has a rectangular shape (for example, a rectangular shape) as viewed from the front, and is a plug receptacle in which two round hole-shaped pin insertion holes 26 are opened. Portion 25, insertion groove 27 formed so as to surround the plug receiving portion 25 and into which the peripheral wall 13 of the insertion plug 1 is inserted, and insertion plugs respectively inserted into the outlet body 20 through the pin insertion holes 26 And a blade receiver 28 into which one electrode pin 12 is fitted.

  The two pin insertion holes 26 are provided corresponding to two (positive and negative electrode) blade supports 28 for supplying DC power, respectively, and according to the position of the electrode pin 12 provided in the plug 1, Placement is determined. That is, the two pin insertion holes 26 are arranged along the upper side of the plug receiving part 25 and are biased toward a position closer to the upper side of the plug receiving part 25 than the lower side of the plug receiving part 25. Has been.

  In addition, a connection terminal (not shown) having a so-called quick connection terminal structure that is electrically connected to the blade holder 28 is housed inside the outlet body 20, and an electric wire insertion hole that opens on the rear surface of the body 21. A power supply line (not shown) of the DC power supply inserted more is connected to the connection terminal. For the connection terminal of the quick connection terminal structure, a conventionally known quick connection terminal as disclosed in, for example, Japanese Patent Laid-Open No. 10-144424 may be used, and illustration and description thereof are omitted.

  In connecting this plug 1 to the DC outlet 2, when the electrode pin 12 and the pin insertion hole 26 are aligned and the plug 1 is brought close to the DC outlet 2, the peripheral wall 13 of the plug 1 is firstly inserted. Is inserted into the insertion groove 27 of the DC outlet 2, and then the electrode pin 12 is inserted into the pin insertion hole 26 and the insertion plug 1 is inserted to a predetermined position. Mechanically connected. When the electrode pin 12 comes into contact with the blade holder 28, the tip of the peripheral wall 13 has already been inserted into the insertion groove 27. Therefore, even if an arc is generated when the electrode pin 12 is in contact, the arc can be seen from the outside. There is nothing.

  When the plug 1 is pulled out from the DC outlet 2, when the plug body 11 is grasped and pulled to the front side, the electrode pin 12 first comes off the blade holder 28 and comes out of the pin insertion hole 26. Since the peripheral wall 13 of the plug 1 comes out of the insertion groove 27, the plug 1 can be easily detached from the DC outlet 2. Note that the tip of the peripheral wall 13 is still inserted into the insertion groove 27 at the moment when the electrode pin 12 is separated from the blade receiver 28, so even if an arc is generated when the electrode pin 12 is opened, the arc is externally generated. Never see.

  Here, in the plug 1 of the present embodiment, the shape of the peripheral wall 13 viewed from the front (plug connection direction) is formed in a square tube shape, and the two electrode pins 12 disposed in the peripheral wall 13 are provided. The inner surface of the peripheral wall 13 is arranged along a reference surface which is one inner surface (upper inner surface) of the peripheral wall 13 and moreover than the inner surface (lower inner surface) facing the reference surface (reference surface (lower inner surface)). Since it is biased to a position close to the upper inner surface), the direction in which the plug 1 is plugged into the DC outlet 2 can be easily understood.

  Further, since the rectangular cylindrical peripheral wall 13 is inserted into the insertion groove 27 formed around the rectangular plug receiving portion 25, the direction in which the plug 1 is attached to the DC outlet 2 is limited. Positioning of the plug 1 and the DC outlet 2 is easy, and an easy-to-use plug 1 can be realized while preventing reverse insertion.

  Further, since the peripheral wall 13 is only formed around the plurality of electrode pins 12 on the front surface of the plug body 11, it is for preventing reverse insertion like a plug for a SELV circuit compliant with the IEC standard described above. Since the rib is not formed, the shape of the insertion plug 1 can be simplified, and the insertion plug 1 is not increased in size to ensure strength.

  When the shape of the peripheral wall 13 viewed from the plug insertion direction (front) is cylindrical, if the two electrode pins 12 are arranged close to one side, the distance between the two electrode pins 12 becomes narrower. However, in this embodiment, since the shape of the peripheral wall 13 as viewed from the plug insertion direction is formed in a square cylinder shape, a plurality of (for example, two in this embodiment) electrode pins 12 are biased toward the reference surface side. Even when arranged, the interval between the plurality of electrode pins 12 is not narrowed, and the insertion plug 1 is not increased in size in order to secure an insulation distance.

  9 (a) and 9 (b), the plug connector 12 is provided with a flat blade-shaped plug blade 12 'instead of the round bar-shaped electrode pin 12, so that the plug receiver When the pin insertion hole 26 ′ having a rectangular hole is formed in the portion 25, the flat blade shaped blade 12 ′ is narrower and vertically longer than the round bar electrode pin 12 in order to make the cross-sectional area the same. Therefore, the pin insertion hole 26 ′ formed in the plug receiving portion 25 is also longer than the round hole-shaped pin insertion hole 26. Here, when the outlet body 20 is formed in one module size, the difference between the vertical dimension (vertical dimension) of the pin insertion hole 26 ′ and the vertical dimension of the plug receiver 25 is small. Even if the pin insertion hole 26 ′ is biased upward from the center position in the vertical direction of 25, the amount of displacement of the pin insertion hole 26 ′ cannot be increased, and the pin insertion hole 26 ′ is biased to either the top or bottom side. There is also a problem that it is difficult to determine whether the flat blade-shaped plug blade 12 'is biased to the upper or lower side. Further, since the pin insertion hole 26 'is formed to be slightly longer than the vertical dimension of the flat blade-shaped plug blade 12', when the amount of deviation in the vertical direction of the opening position of the pin insertion hole 26 'is small, the insertion plug When 1 is inserted in the left-right direction, the end of the flat blade-shaped plug blade 12 'may be inserted into the pin insertion hole 26'. In order to avoid such a problem, as shown in FIGS. 9 (c) and 9 (d), the amount of displacement in the vertical direction at the position where the pin insertion hole 26 'is opened is increased, and the plug body of the insertion plug 1 is also used. 11 is required to increase the vertical dimension of the flat blade-shaped plug blade 12 ′, but this causes a problem that the outlet body 20 and the plug 1 are enlarged. there were. On the other hand, in the present embodiment, the electrode pin 12 is formed in a round bar shape and the pin insertion hole 26 is formed in a round hole shape, so that the vertical direction is higher than in the case of using a flat blade-shaped plug blade 12 '. Therefore, it is possible to easily determine whether the electrode pin 12 is biased in the vertical direction, and even if the plug 1 is connected in the opposite direction, the plug is inserted. The electrode pin 12 of the plug 1 is not inserted into the pin insertion hole 26.

  Incidentally, the plug 1 according to the present invention and the DC outlet 2 to which the plug 1 is connected are used in the DC power distribution system shown in FIG. Although FIG. 8 shows an example in which the DC power distribution system is applied to a house H of a detached house, it goes without saying that the DC power distribution system may be applied to a building such as an apartment house or a tenant building.

  The house H has a direct current power supply unit 52 that outputs direct current power, and a direct current outlet 2 that is disposed at a main point in the house H and through which the direct current power is supplied from the direct current power supply part 52 via the direct current supply line Wdc. And a plurality of DC devices (for example, a refrigerator 60a, a television 60b, a telephone 60c, etc.) that are operated by DC power are provided, and by connecting the plug 1 from the DC devices 60a to 60c to the DC outlet 2, DC power is supplied to the DC devices 60a to 60c. Further, the current flowing through the DC supply line Wdc is monitored between the DC power supply unit 52 and the DC outlet 2, and when an abnormality is detected, the DC power supply unit 52 is connected to the DC outlet 2 on the DC supply line Wdc. A DC breaker 53 is provided to limit or cut off the power supply.

  The DC power supply unit 52 basically converts the AC power supply AC supplied from outside the house like a commercial power supply to generate DC power. In the configuration shown in the figure, the AC power source AC is input to an AC / DC converter 54 including a switching power source through a main circuit breaker 51 attached to the distribution board 50 as an internal unit. The DC power output from the AC / DC converter 54 is connected to each DC breaker 53 through the cooperative control unit 55.

  The DC power supply unit 52 is provided with a secondary battery 57 in preparation for a period during which no power is supplied from the AC power supply AC (for example, a power failure period of the commercial power supply AC). It is also possible to use a solar cell 56 and a fuel cell 58 that generate DC power together. The solar cell 56, the secondary battery 57, and the fuel cell 58 are distributed power sources with respect to the main power source including the AC / DC converter 54 that generates DC power from the AC power source AC. In the illustrated example, the solar cell 56, the secondary battery 57, and the fuel cell 58 include a circuit unit that controls the output voltage, and the secondary battery 57 includes a circuit unit that controls charging as well as discharging.

  Here, since the driving voltages of the DC devices 60a to 60c are selected from a plurality of types of voltages according to the devices, a DC / DC converter is provided in the cooperative control unit 55, and a DC voltage obtained from the main power source and the distributed power source is required. It is desirable to convert the voltage into a suitable voltage and supply it to the corresponding DC outlet 2, and the supply voltage of the DC voltage may be determined as appropriate in accordance with the DC equipment used or the usage environment of the building. Here, a power source circuit that supplies DC power to the DC outlet 2 is provided between the AC power source AC and the DC outlet 2, and is provided, for example, inside the distribution board 50.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. The plug 1 of this embodiment corresponds to a plurality of types of supply voltages, and the shape of the peripheral wall 13 is partially changed according to the types of supply voltages. In addition, since it is the same as that of Embodiment 1 except the shape of the surrounding wall 13, the same code | symbol is attached | subjected to a common component and the description is abbreviate | omitted.

  The plug 1 of this embodiment corresponds to four types of supply voltages (for example, DC6V, 12V, 24V, and 48V), and the shape of the peripheral wall 13 is partially changed according to the type of supply voltage. .

  3 (a) is for 6V, FIG. 3 (b) is for 12V, FIG. 3 (c) is for 24V, and FIG. 3 (d) is a front view of the plug 1 for 48V. In the plug 1, the shape of the peripheral wall 13 is formed in a square tube shape when viewed from the plug insertion direction (front side), whereas in the other plugs 1 for 6V, 12V, and 48V, The peripheral wall is formed so that the shape of the part surrounded by the peripheral wall 13 on the front surface of the plug body 11 as viewed from the front is a shape obtained by cutting out at least one of the square corners according to the type of supply voltage. The shape of 13 corners is partially changed. For example, in the plug 1 for 6V, the lower right corner of the peripheral wall 13 is cut obliquely to form a tapered portion 13a. Further, in the plug 1 for 12V, the lower left corner of the peripheral wall 13 is cut obliquely to form a tapered portion 13a. In the plug 1 for 48V, the lower right and lower left corners of the peripheral wall 13 are formed. The portions are cut obliquely to form tapered portions 13a and 13a. The shape of the insertion groove 27 of the DC outlet 2 is also changed to the same shape as the peripheral wall 13 of the corresponding plug 1 according to the type of supply voltage.

  As described above, among the plugs 1 corresponding to the four kinds of voltage values, in the plug 1 for 24V, the shape of the peripheral wall 13 viewed from the front is formed in a square tube shape, and for 6V, 12V, and 48V. In the plug 1 for use, the corner portion of the peripheral wall 13 is formed such that the shape of the portion surrounded by the peripheral wall 13 on the front surface of the plug body 11 viewed from the front is a shape obtained by cutting out at least one square corner portion. Since the shape of the peripheral wall 13 is partially changed, the type of the supply voltage can be easily determined by the user from the difference in the shape of the peripheral wall 13 viewed from the front, and the shape of the peripheral wall 13 and the insertion groove 27 can be determined. Since the difference can be easily recognized, it is easy to align the plug 1 and the DC outlet 2. Further, since the shapes of the peripheral wall 13 of the plug 1 and the insertion groove 27 of the DC outlet 2 are partially changed according to the type of the supply voltage, the plug is inserted into the DC outlet 2 having a different supply voltage. 1 can be connected to prevent a DC voltage different from the rated voltage from being supplied to the load device.

  Moreover, in this embodiment, when changing the shape of the surrounding wall 13 according to the kind of supply voltage, the shape of the surrounding wall 13 is changed by cutting off at least one corner of the cylindrical portion of the rectangular tube shape, Since the shape of the peripheral wall 13 is changed to a shape in which the area of the part surrounded by the peripheral wall 13 is reduced, it is possible to prevent the peripheral wall 13 from protruding outward and the plug 1 from being enlarged. In the present embodiment, the shape of the peripheral wall 13 is partially changed by cutting off the corners obliquely, but the shape of the part of cutting off the corners may be any shape, for example, as shown in FIG. As shown, the corner portion of the cylindrical portion may be cut off at a substantially right angle to provide the corner portion 13b.

  Furthermore, when the corner portion of the cylindrical portion is cut according to the type of supply voltage, it is not the corner portion on the reference surface side (upper inner surface) where the electrode pins 12 are biased in the peripheral wall 13 but the lower portion. Since the corner portion on the side is cut off, the distance between the electrode pin 12 and the peripheral wall 13 can be made longer than in the case where the corner portion on the reference surface side where the electrode pin 12 is arranged to be biased is cut off. Although it is easy to process the plug 1, the corner portion on the reference surface side of the peripheral wall 13 may be cut off, or the upper (reference surface side) corner portion and the lower portion may be cut as shown in FIG. Both corners on the side (opposite side to the reference plane) may be cut off.

  In addition, when changing the shape of the corner | angular part of the surrounding wall 13 according to the kind of supply voltage, the position and number of the corner | angular part to which a shape is changed, and the shape of a change site | part are limited to said embodiment. However, as long as the type of the supply voltage can be identified, the position and number of corners whose shape is changed and the shape of the changed part are not limited.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the shape of the corners of the peripheral wall 13 is changed according to the type of supply voltage, whereas in the present embodiment, the surface of the peripheral wall 13 according to the type of power supply circuit that is a power supply source. The shape of the peripheral wall 13 is partially changed by extending the extending portion protruding from the peripheral portion. In addition, since it is the same as that of Embodiment 1 or 2 except the shape of the surrounding wall 13, the same code | symbol is attached | subjected to a common component and the description is abbreviate | omitted.

  As the types of power supply circuits that are power supply sources, SELV circuits, ELV circuits, FELV circuits, etc. are standardized by the IEC standard, and plugs for SELV circuits are shown in FIGS. 1 is formed with an extension 15 extending inwardly from the center of the lower side wall of the peripheral wall 13. 4A shows the plug 1 for 6V, FIG. 4B shows the plug for 12V, FIG. 4C shows the plug for 24V, and FIG. 4D shows the plug 1 for 48V. Similarly, the shape of the peripheral portion of the peripheral wall 13 is partially formed so that the portion of the front surface of the plug body 11 that is surrounded by the peripheral wall 13 is viewed from the front, and is formed by cutting at least one square corner. Has been changed. Here, the power supply circuit of the power supply source is provided between the AC power supply AC and the DC outlet 2 in the DC distribution system of FIG. 8 described above, and is provided, for example, inside the distribution board 50.

  On the other hand, the plug 1 for ELV circuit is not provided with the extension 15 as shown in FIGS. 3A to 3D, and the type of the power supply circuit can be easily determined by the presence or absence of the extension 15. can do.

  In addition, in the DC outlet 2 for the SELV circuit, an identification groove (not shown) into which the extension portion 15 is inserted is formed so as to enter the plug receiving portion 25 side from the insertion groove 27. Since the identification outlet is not formed in the DC outlet 2, the ELV circuit plug 1 can be connected to both the ELV circuit DC outlet 2 and the SELV circuit DC outlet 2, but the SELV circuit plug 1 Can be connected only to the DC outlet 2 for the SELV circuit.

  By the way, since the SELV circuit has a higher insulation grade than the ELV circuit, a load device (hereinafter referred to as a SELV device) used in the SELV circuit is a load device (hereinafter referred to as an ELV device) used in the ELV circuit. )) Insulation performance is not so high, and SELV devices often have lower insulation performance than ELV devices. Therefore, if an ELV circuit having a lower insulation grade than that of a SELV circuit and a SELV device having an insulation performance lower than that of an ELV device is used, there is a risk that a failure due to electric leakage may occur. The SELV circuit plug 1 cannot be connected to the ELV circuit DC outlet 2 but can be connected only to the SELV circuit DC outlet 2. Therefore, the SELV device is not used in the ELV circuit. . There is a possibility that the ELV device is connected to the DC outlet 2 for the SELV circuit, but the ELV device has a higher insulation performance than the SELV device, and the SELV circuit has a higher insulation grade than the ELV circuit. There is no particular problem even if ELV equipment is used in the circuit.

  In the plug 1 of the present embodiment, the extension 15 for identifying the type of the power supply circuit is formed so as to protrude from the surface of the peripheral wall 13, so that it is separated from the peripheral wall 13 separately from the peripheral wall 13. Compared with the case where the extension 15 is formed in a shape, the strength of the extension 15 can be maintained.

  Further, since the extension portion 15 is formed so as to protrude inward from the inner side surface of the peripheral wall 13, the entire insertion plug 1 becomes larger than the case where the extension portion 15 is provided on the outer side of the peripheral wall 13. Can be prevented.

  Furthermore, since the extension 15 provided on the inner surface of the peripheral wall 13 is provided on the opposite side of the reference surface (the inner surface of the upper side wall) in the peripheral wall 13, the extension 15 is provided on the reference surface side. Compared to the case, the distance between the extension 15 and the electrode pin 12 can be increased, and the plug 1 that can be easily manufactured can be realized. In addition, the formation position of the extension part 15 and the shape and number of the extension parts 15 are not limited to the above-described form. If the type of the power supply circuit of the power supply source is possible, the formation position and the shape of the extension part 15 are possible. Any number is acceptable.

  By the way, in the plug 1 of FIGS. 4A to 4D, the extension portion 15 that protrudes inward from the inner surface of the peripheral wall 13 is formed according to the type of the power supply circuit. Although the shape is partially changed, as shown in FIG. 5A, the shape of the peripheral wall 13 is partially changed by forming an extension 16 that protrudes outward from the outer surface of the peripheral wall 13. It may be changed. FIG. 5A is a front view of the insertion plug 1 for the SELV circuit, and an extension portion 16 protruding outward from the left side portion of the lower side wall of the peripheral wall 13 is formed.

  In addition, in the direct current outlet 2 for the SELV circuit corresponding to the plug 1, an identification groove (not shown) into which the extension portion 16 is inserted is formed to extend outward from the insertion groove 27. . On the other hand, the extension portion 16 is not formed in the plug 1 for ELV circuit, and the identification groove into which the extension portion 16 is inserted is not formed in the DC outlet 2 for ELV circuit.

  Accordingly, although the plug 1 for the ELV circuit can be connected to both the DC outlet 2 for the ELV circuit and the DC outlet 2 for the SELV circuit, the plug 1 for the SELV circuit is only the DC outlet 2 for the SELV circuit. Can be connected to. Moreover, when the extension part 16 protrudes outward from the outer surface of the peripheral wall 13, the space between the electrode pin 12 and the peripheral wall 13 is not narrowed by forming the extension part 16, and manufacturing. Can be realized.

  In addition, the formation position of the extension part 16 and the shape and number of the extension parts 16 are not limited to the above-described form, and project outward from the lower side part of the left side wall of the peripheral wall 13 as shown in FIG. The extending portion 16 may be formed to extend, or the extending portion 16 protruding outward from the right side portion of the lower wall of the peripheral wall 13 may be formed as shown in FIG. As shown in d), an extension portion 16 protruding outward from the lower side portion of the right side wall of the peripheral wall 13 may be formed. In addition, instead of providing the extension parts 15 and 16, as shown in FIG. 5 (e), an area of the region 18 surrounded by the peripheral wall 13 is formed by forming a bulging part 17 projecting outward on a part of the peripheral wall 13. The shape of the peripheral wall 13 may be changed to a shape in which the width of the peripheral wall 13 is widened. In this case as well, the space between the electrode pin 12 and the peripheral wall 13 is not reduced when the shape of the peripheral wall 13 is changed. Can be realized.

  By the way, the plug 1 described in each of the above embodiments does not include the electrode pin for the ground electrode. However, in addition to the electrode pin 12 for the voltage electrode as shown in FIG. 19 may be provided. In FIG. 6, the electrode pin 19 for the ground electrode is added to the plug 1 described in the second embodiment, but the electrode pin 19 for the ground electrode is provided in the plug 1 of the other embodiment. Needless to say, it may be. Further, in the plug 1 shown in FIG. 6, the three electrode pins 12 and 19 are connected to the electrode pin 19 of the ground electrode at the apex of the isosceles triangle whose base is the line connecting the two electrode pins 12 of the voltage electrode. However, the position of the electrode pin 19 of the ground electrode is not limited to the position shown in FIG.

1 Plug 2 DC outlet 11 Plug body 11a Inner case (fixed part)
11b Outer case (housing)
12 Electrode pin 13 Peripheral wall 26 Pin insertion hole 27 Insertion groove 28 Blade holder

Claims (6)

Insertion grooves are formed around a plurality of pin insertion holes that open to the front, and the blade holders are detachably connected to the DC outlets that are housed inside facing the pin insertion holes, and supply DC power from the DC outlets. A plug to receive,
It protrudes from the front of the plug body, and is inserted into the pin insertion hole of the DC outlet and fits into the blade rest so that it surrounds the round electrode pins that receive power supply from the DC outlet and the periphery of the electrode pins Protruding on the front surface of the plug body, and having a peripheral wall inserted into the insertion groove of the DC outlet,
The peripheral wall is formed in a rectangular tube shape when viewed from the plug insertion direction, and the plurality of electrode pins are arranged side by side along a reference surface which is one inner surface of the peripheral wall and face the reference surface. It is biased to a position closer to the reference surface than the inner surface,
The plug body is composed of a fixing portion for fixing a plurality of electrode pins, and a synthetic resin housing in which the peripheral wall is integrally provided by secondary molding so as to cover the outside of the fixing portion. Plug plug characterized by that.   The shape of the part surrounded by the peripheral wall on the front surface of the plug body as viewed from the front is a shape obtained by cutting at least one of the square corners according to the type of supply voltage. 2. The plug according to claim 1, wherein a shape of a corner portion of the peripheral wall is partially changed.   The corner portion of the peripheral wall so that the shape of the portion surrounded by the peripheral wall on the front surface of the plug main body as viewed from the front is a shape obtained by cutting out a corner portion on the opposite side to the reference surface among the square corner portions. 3. The plug according to claim 2, wherein the shape of the plug is partially changed.   The peripheral wall is characterized in that the shape of the peripheral wall is partially changed according to the type of the power supply circuit that is a power supply source by extending an extension projecting from the surface of the peripheral wall. The plug according to any one of claims 1 to 3.   The insertion plug according to claim 4, wherein the extension portion is formed to extend on an inner surface of the peripheral wall.   The insertion plug according to claim 5, wherein the extension portion is provided on the side of the peripheral wall opposite to the reference surface.

Images