JP2009146778A - DC connection device - Google Patents

Abstract

Disclosed is a DC connection device capable of reliably preventing an arc due to a DC current from being generated between a connection terminal and a connection portion when the connection terminal of the plug and the connection portion of the outlet are separated. .
A DC power distribution plug having a connection terminal used for a DC-driven electric device, and a DC power distribution outlet having a connection portion electrically connected to the connection terminal of the plug. Is a DC connection device. When the connection terminal 3 of the plug 2 and the connection portion 5 of the outlet 1 are separated, an electric circuit opening / closing mechanism for opening the DC electric circuit C1 in the outlet 1 immediately before the separation is provided.
[Selection] Figure 1

Description

  The present invention relates to a direct current connection device including a plug and outlet for DC power distribution.

  2. Description of the Related Art Conventionally, as a connection device for AC distribution, an AC distribution plug having a connection terminal used for an electric device and an AC distribution outlet having a connection portion to which each connection terminal of the plug is electrically connected are provided. Are well known (see, for example, Patent Document 1).

By the way, when the plug is pulled out and separated from the outlet during energization, and the connection terminal of the plug is separated from the connection part of the outlet, an arc is generated between the connection terminal and the connection part. . The arc generated here is caused by alternating current and does not have a significant effect on wear or safety. However, when the above-mentioned DC connection device for AC distribution is to be applied to DC distribution, an arc generated by direct current is used. As a result, it has a great influence on wear and safety.
Japanese Patent Laid-Open No. 10-326656

  The present invention has been invented in view of the above problems, and when opening the connecting portion of the plug and the connecting portion of the outlet, an arc caused by a direct current is generated between the connecting terminal and the connecting portion. It is an object of the present invention to provide a direct-current connection device that can be reliably prevented.

  In order to solve the above problems, the present invention provides a plug 2 for DC power distribution having a connection terminal 3 used for a DC-driven electric device 102 and a connection part 5 electrically connected to the connection terminal 3 of the plug 2. A DC power distribution outlet 1 having a DC distribution outlet, and when the connection terminal 3 of the plug 2 and the connection portion 5 of the outlet 1 are separated, the outlet 1 An electric circuit opening / closing mechanism for opening the DC electric circuit C1 is provided. In this way, even when the plug 2 is disconnected from the outlet 1 during energization, the DC circuit in the outlet 1 is in a stage before the connection terminal 3 of the plug 2 is disconnected from the connection portion 5 of the outlet 1. C1 is opened to cut off energization. Therefore, a situation in which an arc due to a direct current occurs between the connection terminal 3 and the connection portion 5 is reliably prevented.

  Further, in the DC connection device having the above configuration, the plug 2 is rotated with respect to the outlet 1 and then separated to open the connection terminal 3 of the plug 2 and the connection portion 5 of the outlet 1. In addition, it is preferable that the electric circuit opening / closing mechanism includes a mechanism for opening the DC electric circuit C1 in the outlet 1 in conjunction with the rotation of the plug 2. By doing so, the DC electric circuit C1 in the outlet 1 is opened at the stage where the plug 2 is rotated, and the energization is reliably interrupted.

  Further, as the electric circuit opening / closing mechanism, a magnetic force acts when the plug 2 is close to the outlet 1 to close the DC electric circuit C1 in the outlet 1, and the magnetic force is released when the plug 2 is separated from the outlet 1. It is also preferable to provide a mechanism for opening the DC electric circuit C1 in the outlet 1. By doing so, the DC electric circuit C1 in the outlet 1 is opened when the plug 2 is separated from the outlet 1, and the energization is reliably cut off.

  In addition, the present invention for solving the above-described problems includes a plug 2 for DC distribution having a connection terminal 3 used for a DC-driven electric device 102 and a connection electrically connected to the connection terminal 3 of the plug 2. A DC connection apparatus comprising a DC power distribution outlet 1 having a section 5, wherein the plug 2 immediately before the disconnection when the connection terminal 3 of the plug 2 and the connection section 5 of the outlet 1 are separated. An electric circuit opening / closing mechanism for opening the DC circuit C2 may be provided. Thus, even when the plug 2 is disconnected from the outlet 1 during energization, the DC circuit in the plug 2 is in a stage before the connection terminal 3 of the plug 2 is disconnected from the connection portion 5 of the outlet 1. C2 is opened to cut off energization. Therefore, a situation in which an arc due to a direct current occurs between the connection terminal 3 and the connection portion 5 is reliably prevented.

  According to the first aspect of the present invention, when the plug is removed from the outlet during energization, the DC electric circuit in the outlet is opened and the energization is interrupted before the connection terminal of the plug is separated from the connection portion of the outlet. The effect that an arc caused by a direct current is prevented can be reliably prevented.

  In addition to the effect of the invention according to claim 1, the invention according to claim 2 has the effect that the direct current circuit in the outlet can be opened and the energization can be reliably interrupted when the plug is rotated. .

  In addition to the effect of the invention according to claim 1, the invention according to claim 3 has an effect that the direct current circuit in the outlet can be opened and the energization can be surely interrupted when the plug is separated from the outlet. Play.

  In the invention according to claim 4, when the plug is removed from the outlet during energization, the DC electric circuit in the plug is opened to interrupt the energization before the connection terminal of the plug is separated from the connection portion of the outlet. Therefore, there is an effect that a situation in which an arc caused by a direct current is reliably prevented.

  Hereinafter, an example DC connection device in an embodiment of the present invention will be described with reference to the drawings. First, the entire DC power distribution system configured using the DC connection device of this example will be described with reference to FIG. 4, and then the DC connection device will be described in further detail with reference to FIGS.

  Although the embodiment of the DC power distribution system described below is described assuming a detached house as a building to which the present invention is applied, it does not preclude applying the technical idea of the present invention to an apartment house. As shown in FIG. 4, the house H is provided with a DC power supply unit 101 that outputs DC power and an electric device 102 as a load driven by the DC power, and an output end of the DC power supply unit 101. The DC power is supplied to the electric device 102 through the DC supply line Wdc connected to. A current flowing through the DC supply line Wdc is monitored between the DC power supply unit 101 and the electric device 102. When an abnormality is detected, power is supplied from the DC power supply unit 101 to the electric device 102 on the DC supply line Wdc. A DC breaker 114 is provided for limiting or blocking the current.

  The DC supply line Wdc is used as both a DC power supply path and a communication path, and is connected to the DC supply line Wdc by superimposing a communication signal for transmitting data on a DC voltage using a high-frequency carrier wave. Enables communication between devices. This technique is similar to a power line carrier technique in which a communication signal is superimposed on an AC voltage in a power line that supplies AC power.

  The DC supply line Wdc is connected to the home server 116 via the DC power supply unit 101. The in-home server 116 is a main device for constructing a home communication network (hereinafter referred to as “home network”), and communicates with a subsystem or the like constructed by the electrical device 102 in the home network.

  In the example shown in the figure, as a subsystem, an illumination system comprising an information equipment system K101 comprising an information electrical equipment 102 such as a personal computer, a wireless access point, a router, and an IP telephone, and an illumination electrical equipment 102 such as a lighting fixture. K102 and K105, a front door system K103 including an electric device 102 for dealing with visitors and monitoring intruders, a residential alarm system K104 including an alarm-type electric device 102 such as a fire detector, and the like. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The above-described DC breaker 114 is provided in association with a subsystem. In the illustrated example, four DCs are associated with the information equipment system K101, the lighting system K102 and the entrance system K103, the house alarm system K104, and the lighting system K105. A breaker 114 is provided. When a plurality of subsystems are associated with one DC breaker 114, a connection box 121 for dividing the system of the DC supply line Wdc is provided for each subsystem. In the illustrated example, a connection box 121 is provided between the illumination system K102 and the entrance system K103.

  As the information equipment system K101, there is an information equipment system K101 composed of the electrical equipment 102 connected to the outlet 1 for DC power distribution that is arranged in advance in the house H in the form of a wall outlet or a floor outlet (constructed when the house H is constructed). Provided. A more detailed configuration of the outlet 1 will be described later.

  The lighting systems K102 and K105 include a lighting system K102 composed of a lighting device (electrical device 102) arranged in advance in the house H, and a lighting device (electrical device 102) connected to a hook ceiling 132 arranged in advance in the ceiling. An illumination system K105 is provided. At the time of interior construction of the house H, the contractor attaches the lighting fixture to the hook ceiling 132, or the householder himself attaches the lighting fixture.

  In addition to using an infrared remote control device, an instruction to control the lighting fixture that is the electrical device 102 that constitutes the lighting system K102 can be given using a communication signal from the switch 141 connected to the DC supply line Wdc. That is, the switch 141 has a communication function together with the electric device 102. In addition, a control instruction may be given by a communication signal from another electrical device 102 in the home network or the home server 116 regardless of the operation of the switch 141. The instructions to the lighting fixture include lighting, extinguishing, dimming, and blinking lighting.

  An arbitrary electrical device 102 can be connected to the outlet 1 and the hook ceiling 132 described above, and DC power is output to the connected electrical device 102. Therefore, it is necessary to distinguish between the outlet 1 and the hook ceiling 132 below. If not, it is called “DC outlet”.

  These DC outlets supply power in a contact manner. When the electric device 102 connected to the DC outlet has a communication function, a communication signal can be transmitted through the DC supply line Wdc. A communication function is provided not only in the electric device 102 but also in the DC outlet.

  The home server 116 not only is connected to the home network, but also has a connection port connected to the wide area network NT that constructs the Internet. When the in-home server 116 is connected to the wide area network NT, it is possible to receive services from the center server 200 that is a computer server connected to the wide area network NT.

  The service provided by the center server 200 includes a service that enables monitoring and control of equipment (mainly the electrical equipment 102 but also other equipment having a communication function) connected to the home network through the wide area network NT. is there. This service makes it possible to monitor and control devices connected to the home network using a communication terminal (not shown) having a browser function such as a personal computer, Internet TV, or mobile phone.

  The in-home server 116 has both functions of communication with the center server 200 connected to the wide area network NT and communication with equipment connected to the home network, and identification information on equipment in the home network ( Here, it is assumed that an IP address is used).

  The home server 116 enables monitoring and control of home devices through the center server 200 from a communication terminal connected to the wide area network NT by using a communication function with the center server 200. The center server 200 mediates between home devices and communication terminals on the wide area network NT.

  When monitoring and controlling home devices from a communication terminal, monitoring and control requests are stored in the center server 200, and the home device periodically performs one-way polling communication to monitor from the communication terminal. And receive control requests. With this operation, it is possible to monitor and control devices in the house from the communication terminal.

  Further, when an event that should be notified to the communication terminal, such as a fire detection, occurs in the home device, the home device notifies the center server 200, and the center server 200 notifies the communication terminal by e-mail.

  An important function among the communication functions with the home network in the home server 116 is the detection and management of devices constituting the home network. The home server 116 automatically detects devices connected to the home network by applying UPnP (Universal Plug and Play). The home server 116 includes a display device 117 having a browser function, and displays a list of detected devices on the display device 117. The display device 117 has a configuration with a touch panel type or an operation unit, and can perform an operation of selecting desired contents from options displayed on the screen of the display device 117. Therefore, the user (contractor or householder) of the home server 116 can monitor or control the device on the screen of the display device 117. The display device 117 may be provided separately from the home server 116.

  The in-home server 116 manages information related to device connection, and grasps the type, function, and address of the device connected to the home network. Accordingly, the devices in the home network can be operated in conjunction with each other. Information on the connection of the device is automatically detected as described above. In order to operate the device in an interlocking manner, the device itself is automatically associated with the attribute held by the device itself, and the home server 116 is configured as a personal computer. It is also possible to connect various information terminals and use the browser function of the information terminals to associate devices.

  Each device holds the relationship of the interlocking operation of the devices. Therefore, the device can operate in an interlocked manner without passing through the home server 116. By associating the linked operations for each device, for example, by operating a switch that is a device, it is possible to turn on or off the lighting fixture that is the device. In many cases, the association of the interlocking operations is performed within the subsystem, but the association beyond the subsystem is also possible.

  By the way, the DC power supply unit 101 basically generates DC power by power conversion of an AC power supply AC supplied from outside the house like a commercial power supply. In the configuration shown in the figure, the AC power source AC is input to an AC / DC converter 112 including a switching power source through a main circuit breaker 111 attached to the distribution board 110 as an internal unit. The DC power output from the AC / DC converter 112 is connected to each DC breaker 114 through the cooperative control unit 113.

  The DC power supply unit 101 is provided with a secondary battery 162 in preparation for a period in which power is not 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 161 or a fuel cell 163 that generates DC power. The solar battery 161, the secondary battery 162, and the fuel battery 163 are distributed power supplies with respect to the main power supply including the AC / DC converter 112 that generates DC power from the AC power supply AC. In the illustrated example, the solar cell 161, the secondary battery 162, and the fuel cell 163 include a circuit unit that controls the output voltage, and the secondary battery 162 includes a circuit unit that controls charging as well as discharging.

  Of the distributed power sources, the solar cell 161 and the fuel cell 163 are not necessarily provided, but the secondary battery 162 is preferably provided. The secondary battery 162 is charged in a timely manner by a main power source or other distributed power source, and the secondary battery 162 is discharged not only in a period in which power is not supplied from the AC power source AC but also in a timely manner as necessary. The cooperation control unit 113 performs charge / discharge of the secondary battery 162 and cooperation between the main power source and the distributed power source. That is, the cooperative control unit 113 functions as a DC power control unit that controls distribution of power from the main power supply and the distributed power supply that constitute the DC power supply unit 101 to the electrical device 102. Note that a configuration may be adopted in which the outputs of the solar cell 161, the secondary battery 162, and the fuel cell 163 are converted into AC power and used as input power of the AC / DC converter 112.

  Since the driving voltage of the electric device 102 is selected from a plurality of types of voltages according to the device, the cooperative control unit 113 is provided with a DC / DC converter to convert the DC voltage obtained from the main power source and the distributed power source into the necessary voltage. Is desirable. Normally, one type of voltage is supplied to one subsystem (or the electric equipment 102 connected to one DC breaker 114), but three or more wires are used for one subsystem. A plurality of types of voltages may be supplied. Alternatively, it is possible to adopt a configuration in which the DC supply line Wdc is of a two-wire type and the voltage applied between the lines is changed with time. The DC / DC converter may be provided in a plurality of dispersed manners like the DC breaker.

  In the above configuration example, only one AC / DC converter 112 is illustrated, but a plurality of AC / DC converters 112 can be arranged in parallel, and when a plurality of AC / DC converters 112 are provided. It is desirable to increase or decrease the number of AC / DC converters 112 that are operated according to the magnitude of the load.

  The AC / DC converter 112, the cooperative control unit 113, the DC breaker 114, the solar cell 161, the secondary battery 162, and the fuel cell 163 described above are provided with a communication function, and include a main power source, a distributed power source, and an electric device 102. It is possible to perform cooperative operations that deal with the load status. The communication signal used for this communication is transmitted in the form of being superimposed on the DC voltage in the same manner as the communication signal used for the electric device 102.

  In the above example, the AC / DC converter 112 is arranged in the distribution board 110 in order to convert the AC power output from the main breaker 111 into DC power by the AC / DC converter 112. On the output side, a branch breaker (not shown) provided in the distribution board 110 branches the AC supply line into a plurality of systems, and an AC / DC converter is provided on the AC supply line of each system to convert it into DC power for each system. You may employ | adopt the structure to do.

  In this case, since the DC power supply unit 101 can be provided for each floor or room of the house H, the DC power supply unit 101 can be managed for each system, and the electric device 102 that uses DC power Since the distance of the DC supply line Wdc between the two is reduced, the power loss due to the voltage drop in the DC supply line Wdc can be reduced. Also, the main breaker 111 and the branch breaker are housed in the distribution board 110, and the AC / DC converter 112, the cooperative control unit 113, the DC breaker 114, and the home server 116 are housed in a separate board from the distribution board 110. Also good.

  Next, the configuration of an example DC connection device including the outlet 1 for DC distribution and the plug 2 for DC distribution will be described in detail with reference to FIGS.

  As shown in FIG. 3, the plug 2 includes a pair of connection terminals 3 used for the electric device 102 that is DC-driven, and a plug body 6 that supports the connection terminals 3. As shown in FIG. 1 and FIG. 2, the outlet 1 includes a pair of outlets 7 formed on the outlet body 7 so that the outlet body 7 and a pair of connection terminals 3 protruding from the plug 2 are inserted and rotated. Insertion port 4 and a pair of DC power supply connection parts 5 arranged in the outlet body 7 so that each connection terminal 3 inserted and rotated through each insertion port 4 is electrically connected. .

  The pair of connection terminals 3 of the plug 2 is formed of an L-shaped plug blade that protrudes in parallel from one side of the box-shaped plug main body 6 and has a distal end portion 3a bent inward. Also, the pair of insertion ports 4 of the outlet 1 are arranged in parallel on one side of the box-shaped outlet body 7, and both insertion ports 4 are centered on the central portion 7 a of the one side of the outlet body 7. It is formed in a circular arc shape with the same radius.

  Both insertion openings 4 have a narrow portion 4a formed with a narrow width on one side (right side in the illustrated example) in the left-right direction when viewed from the central portion 7a of the outlet main body 7, and the central portion 7a of the outlet main body 7 is also the same. A wide portion 4b having a wide width is formed on the other side (left side in the illustrated example) in the left-right direction when viewed from the side. The wide portion 4b communicates with the narrow portion 4a and is widened so as to protrude inward with respect to the narrow portion 4a. The width of the wide portion 4b is a width that allows the distal end portion 3a of the connection terminal 3 to be inserted straight (that is, along the direction in which the plug 2 is brought close to and away from the outlet 1) (see FIG. 2B). ), The width of the narrow portion 4a is a width that cannot be inserted straight through the tip 3a of the connection terminal 3 (see FIGS. 2C and 2D).

  Therefore, when the L-shaped connection terminal 3 is inserted into the insertion port 4 and hooked and locked, the front end 3a of the connection terminal 3 is inserted straight into the wide portion 4b, and then the outlet body 7 The plug body 6 is rotated clockwise so that the center portion 7a is centered. Thereby, the front-end | tip part 3a of the connection terminal 3 overlaps with the inner side part (namely, part near the center part 7a) of the narrow part 4a periphery of the outlet main body 7. FIG. A connecting portion 5 for direct current power supply is arranged inside the periphery of the narrow portion 4a of the outlet body 7, and when the tip 3a of the connection terminal 3 is introduced to the narrow portion 4a side, the connecting portion 5 is provided. Is elastically brought into contact with the distal end portion 3a of the connection terminal 3 to be locked.

  Furthermore, an electric circuit opening / closing switch 8 that is mechanically turned on when the tip 3 a of the connection terminal 3 comes into contact with the connection portion 5 is disposed around the narrow portion 4 a of the outlet body 7. The electric circuit opening / closing switch 8 includes an operation piece 8a that is elastically pushed against the distal end portion 3a when the distal end portion 3a of the connection terminal 3 comes into contact with the connection portion 5, and an outlet 1 that is normally kept open. It comprises a switch body 8b that closes the inner DC circuit C1 in conjunction with the pressing of the operation piece 8a (see FIG. 2).

  In the DC connection device comprising the outlet 1 and the plug 2 having the above-described configuration, when the tip 3a of the connection terminal 3 of the plug 2 is inserted into the wide portion 4b of the insertion port 4 of the outlet 1 and rotated clockwise, the connection terminal When 3 reaches the end of the narrow portion 4a, the tip portion 3a comes into contact with the connection portion 5, and when it is further rotated a little, the operation piece 8a is pushed in and the electric circuit opening / closing switch 8 is turned on. The electric circuit opening / closing switch 8 turned on here closes the DC electric circuit C <b> 1, and energization is performed between the connection terminal 3 and the connection portion 5.

  On the other hand, in order to separate the connection terminal 3 of the plug 2 and the connection portion 5 of the outlet 1, the plug 2 is first rotated counterclockwise with respect to the outlet 1. The tip 3a of the connection terminal 3 is separated from the connection portion 5 by this rotation, and the plug 2 may be pulled out and separated from the outlet 1 when reaching the wide portion 4b.

  Here, when the connecting terminal 3 of the plug 2 is separated from the connecting portion 5 of the outlet 1, the operating piece 8a of the electric circuit opening / closing switch 8 is elastically restored immediately before the opening, so that the DC electric circuit C1 in the outlet 1 is restored. Is returned to the open circuit state. Therefore, when the connection terminal 3 is separated from the connection portion 5, an arc due to a direct current is not generated, and problems such as wear of the connection terminal 3 and the connection portion 5 due to the generation of the direct current arc, Problems such as exposure of the arc of current are also prevented.

  Next, another example of the DC connection device according to the embodiment of the present invention will be described with reference to FIG. 5, but the detailed description of the same configuration as that of the above-described example of the DC connection device is omitted, and is different from the example. The characteristic configuration of this example will be described in detail below.

  In the DC connection device of this example, as an arc prevention circuit path opening / closing mechanism that opens the DC circuit C1 in the outlet 1 immediately before the connection terminal 3 of the plug 2 and the connection part 5 of the outlet 1 are opened, as an example Is not equipped with a mechanism for opening the DC electric circuit C1 in the outlet 1 in conjunction with the rotation of the plug 2, but when the plug 2 comes close to the outlet 1, a magnetic force acts to close the DC electric circuit C1 in the outlet 1. And when the plug 2 leaves | separates from the outlet 1, the magnetic force is cancelled | released and it has the characteristic in the point provided with the mechanism which opens the DC electric circuit C1 in the outlet 1.

  As shown in FIG. 5, the connection terminal 3 of the plug 2 of this example is formed of a flat plug blade projecting in parallel from one surface side of a plug body 6 having a box shape. Moreover, the insertion port 4 of the outlet 1 is provided side by side on the one surface side of the outlet body 7 having a box shape, and includes a blade receiving port having a rectangular section in which the connection terminal 3 is fitted. Each insertion port 4 communicates with a pair of connection portions 5 arranged in the outlet body 7.

  A magnet 10 is embedded in the vicinity of the connection terminal 3 on the surface of the plug body 6 where the connection terminal 3 protrudes. A magnet switch 11 is embedded in the vicinity of the insertion port 4 on the surface of the outlet body 7 where the insertion port 4 is opened. The magnet 10 and the magnet switch 11 are disposed at positions facing each other when the connection terminal 3 of the plug 2 is inserted into the insertion port 4 of the outlet 1 and connected to the connection portion 5. This magnet switch 11 opens and closes the DC circuit C1 in the outlet 1, and closes the DC circuit C1 when a magnet 10 incorporated in the plug 2 comes close and a sufficient magnetic force acts. On the other hand, when a sufficient magnetic force is not applied, the DC circuit C1 is continuously opened.

  In the direct current connection device including the outlet 1 and the plug 2 having the above-described configuration, when the connection terminal 3 of the plug 2 is inserted into the insertion port 4 of the outlet 1, the connection terminal 3 and the connection portion 5 in the outlet body 7 are elastic. By inserting further after contact, the plug body 6 comes into close contact with the outlet body 7. When this close contact state is reached, the magnet 10 incorporated in the plug body 6 applies a sufficient magnetic force to the magnet switch 11 incorporated in the outlet body 7, and the magnet switch 11 closes the DC electric circuit C1. Thus, energization is performed between the connection terminal 3 and the connection portion 5 in the elastic contact state.

  On the other hand, when the plug body 6 is pulled away from the outlet 1, the close contact between the plug body 6 and the outlet body 7 is first released, and the magnet 10 does not act on the magnet switch 11 with sufficient electromagnetic force. Thus, the DC electric circuit C1 in the outlet 1 is opened and the energization is interrupted. Thereafter, by further pulling out the plug body 6, the connection terminal 3 and the connection portion 5 are separated. Therefore, when the connection terminal 3 is separated from the connection portion 5, an arc due to a direct current is not generated, and problems such as wear of the connection terminal 3 and the connection portion 5 due to the generation of the direct current arc, Problems such as exposure of the arc of current are also prevented.

  Next, still another example of the DC connection device according to the embodiment of the present invention will be described with reference to FIG. 6, but the detailed description of the same configuration as that of the above-described other example DC connection device will be omitted. The different characteristic configuration of this example will be described in detail below.

  In the direct current connection device of this example, the magnet 10 on the plug 2 side that forms an electric path opening / closing mechanism for preventing arc together with the magnet switch 11 on the outlet 1 side is used as a means for maintaining the contact state of the plug 2 with respect to the outlet 1. Is also characterized in that it is also used.

  On the surface of the plug body 6 on which the connection terminal 3 protrudes, a magnet 10 is disposed at a position sandwiching the connection terminal 3 from both the upper and lower sides. On the surface of the outlet body 7 where the insertion opening 4 is opened, a plate-like magnet adsorbing body 12 made of a magnetic material (iron in this example) is arranged at a position sandwiching the insertion opening 4 from above and below. Yes. The magnet 10 and the magnet adsorber 12 are disposed at positions facing each other when the connection terminal 3 of the plug 2 is inserted into the insertion port 4 of the outlet 1 and connected to the connection portion 5.

  In the direct current connection device including the outlet 1 and the plug 2 having the above-described configuration, when the connection terminal 3 of the plug 2 is inserted into the insertion port 4 of the outlet 1, the connection terminal 3 and the connection portion 5 in the outlet body 7 are elastic. At the same time, the plug body 6 comes into close contact with the outlet body 7. When this close contact state is reached, the pair of magnets 10 incorporated in the plug body 6 are attracted to the magnet adsorbers 12 incorporated in the outlet body 7, and the contact between the plug body 6 and the outlet body 7 is achieved by magnetic attraction. Hold. In this stable contact state, one of the pair of magnets 10 applies a magnetic force to the magnet switch 11 and closes the DC circuit C1.

  When a force is applied to the plug body 6 in a direction away from the outlet body 7, the plug body 6 is removed from the outlet body 7 against the magnetic attractive force between the magnet 10 and the magnet attracting body 12 that are in close contact with each other. At this time, when the magnetic force of the magnet 10 does not sufficiently act on the magnet switch 11, the DC circuit C1 in the outlet 1 in the closed state is opened and the energization is cut off. Thereafter, by further pulling out the plug body 6, the connection terminal 3 and the connection portion 5 are separated.

  In this example, a pin-type plug blade is used as the connection terminal 3, and a blade receptacle having a circular cross section corresponding to the pin-type plug blade is formed as the insertion port 4. Reference numeral 3 denotes a flat plug blade, and the insertion port 4 may be a blade receiving port having a rectangular cross section corresponding to the flat plug blade.

  Next, still another example of the DC connection device according to the embodiment of the present invention will be described with reference to FIGS. 7 and 8. However, detailed description of the same configuration as that of the above-described other example DC connection device is omitted. The characteristic configuration of this example, which is different from the other examples, will be described in detail below.

  In the DC connection device of this example, as an electric circuit opening / closing mechanism for arc prevention, the DC circuit C1 on the outlet 1 side is connected just before the connection terminal 3 of the plug 2 and the connection part 5 of the outlet 1 are separated as in other examples. Rather than having a mechanism for opening the circuit, it is characterized by a mechanism for opening the DC electric circuit C2 on the plug 2 side immediately before the connection terminal 3 of the plug 2 and the connection part 5 of the outlet 1 are separated. .

  The connection terminal 3 of the plug 2 of this example is composed of a flat plug blade protruding in parallel from the front end surface 6a of the box-shaped plug body 6. Further, although the illustration of the outlet 1 side is omitted here, the insertion port 4 of the outlet 1 is arranged in parallel on one side of the outlet main body 7 having a box shape as in the other examples.

  A push button 13 that opens and closes a DC electric circuit C <b> 2 disposed in the plug body 6 is disposed on a portion of the side surface 6 b of the plug body 6 where the user hits the thumb when the user grips the plug body 6. The push button 13 has an NC contact portion 13a disposed in the plug main body 6 so that the DC electric circuit C2 is closed at the normal time when no external force is applied, and an external force is applied to the NC contact portion 13a to connect the DC electric circuit C2. It comprises a push operation portion 13b that is exposed and arranged on the side surface 6b of the plug body 6 so as to open the circuit. The pushing operation part 13b can be pushed inward while resisting the restoring force.

  In the DC connection device including the plug 2 having the above-described configuration, when the plug body 6 is gripped while pressing with the thumb against the pushing operation portion 13b exposed on the side surface 6b of the plug body 6, the NC contact portion 13a is activated. Normally, the DC circuit C2 in the closed state is opened. With this state maintained, the connection terminal 3 of the plug 2 is inserted into the insertion port 4 of the outlet 1 and brought into elastic contact with the connection portion 5, and then the hand holding the plug body 6 is released. As a result, the pushing operation part 13b returns to the normal position by the restoring force, and the NC contact part 13a closes the DC electric circuit C2 and energizes between the connection terminal 3 and the connection part 5.

  On the other hand, when unplugging the plug body 6 from the outlet 1, first, the plug body 6 is gripped while pushing the pushing operation part 13b on the side surface 6b of the plug body 6 with a thumb, and the DC circuit C2 in the closed state is opened. Pull out from outlet 1 after opening. Therefore, even when the plug main body 6 is pulled out during energization, the DC electric circuit C2 in the plug main body 6 is opened and the energization is interrupted before the connection terminal 3 is separated from the connection portion 5. Therefore, when the connection terminal 3 is separated from the connection portion 5, an arc due to the direct current is not generated, and problems such as wear of the connection terminal 3 and the connection portion 5 due to the generation of the direct current arc, Problems such as exposure of the arc of current are also prevented.

The outlet of the direct-current connection apparatus of an example in embodiment of this invention is shown, (a) is a front view, (b) is a schematic circuit diagram. The main part of an outlet same as the above is shown, (a) is a front view, (b) is a cross-sectional view taken along line AA in (a), (c) is a cross-sectional view taken along line BB in (a), and (d) is a cross-sectional view. (A) CC sectional view taken on the line, (e) is the DD sectional view taken on the line (a). It is a perspective view which shows the plug of a direct-current connection apparatus same as the above. 1 is an overall explanatory diagram of a DC power distribution system configured using the DC connection device same as above. FIG. The direct-current connection apparatus of the other example in embodiment of this invention is shown, (a) is a perspective view of an outlet socket and a plug, (b) is a schematic open circuit diagram of an outlet socket. The direct-current connection apparatus of the other example in embodiment of this invention is shown, (a) is a front view of an outlet socket and a plug, (b) is a schematic open circuit diagram of an outlet socket. The outlet of the direct-current connection apparatus of the other example in embodiment of this invention is shown, (a) is a perspective view, (b) is a schematic circuit diagram. It is a perspective view of the state which grasped the outlet socket same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outlet 2 Plug 3 Connection terminal 4 Insertion port 5 Connection part 7 Outlet body 102 Electric equipment C1 DC circuit C2 DC circuit

Claims (4)

  A DC connection device comprising: a plug for DC distribution having a connection terminal used for an electric device driven by direct current; and an outlet for DC distribution having a connection portion electrically connected to the connection terminal of the plug. A DC connection device comprising: an electric circuit opening / closing mechanism for opening a DC electric circuit in the outlet immediately before the disconnection between the connection terminal of the plug and the connection portion of the outlet.   The plug is rotated with respect to the outlet and then separated to open the connection terminal of the plug and the connection portion of the outlet, and the electric circuit opening / closing mechanism is interlocked with the rotation of the plug. The DC connection device according to claim 1, further comprising a mechanism for opening a DC electric circuit in the outlet.   As the electric circuit opening / closing mechanism, when the plug is close to the outlet, a magnetic force acts to close the DC electric circuit in the outlet, and when the plug is separated from the outlet, the magnetic force is released and the DC electric circuit in the outlet is released. The DC connection device according to claim 1, further comprising a mechanism that opens the circuit. A DC connection device comprising: a plug for DC distribution having a connection terminal used for an electric device driven by direct current; and an outlet for DC distribution having a connection portion electrically connected to the connection terminal of the plug. A DC connection device comprising: an electric circuit opening / closing mechanism that opens a DC electric circuit in the plug immediately before the disconnection when the connection terminal of the plug and the connection portion of the outlet are disconnected.

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