JP2013157175A - Connector structure for photovoltaic power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten an assembling work, in a connector structure for a photovoltaic power generation system, by resolving the problem that it takes much efforts to the assembling work and that the number of components becomes large because of screwing to a housing attachment hole.SOLUTION: A connector structure for a photovoltaic power generation system comprises: a connector 4 for a substrate having a connection part with a bayonet lock structure mounted on a printed board 3 inside a housing 2 and arranged facing an attachment hole; a connector 5 for a panel having a connection part 5a arranged so as to be opposed to the attachment hole outside the housing and inserted into the attachment hole to be connected with the connection part of the bayonet lock structure of the connector for a substrate in a complementary manner; and a waterproofing packing intervening between an outer peripheral surface of the attachment hole part in the housing and a flange 5b for attachment of the connector for a panel. One connection part of the bayonet lock structure is provided with two grooves that are engraved on a cylinder for fitting in a circumferential direction and provided in a front and rear direction that is an inserting and drawing-out direction, and the other connection part of the bayonet lock structure is a projection protrusively provided on a surrounding wall surface for fitting and fitted with the groove.

Description

  The present invention relates to a connector structure for a photovoltaic power generation system.

  Conventionally, as a method for optimizing the power generated by the solar cell module, as shown in FIG. 7A, the voltage output by connecting solar cell panels (hereinafter simply referred to as panels) in series or in parallel is the power. It is sent to a conditioner, and in this power conditioner, a DC voltage is converted into an AC voltage and synchronized with the power network (see Patent Document 1). On the other hand, in recent years, in order to cope with variations in conversion efficiency of each panel in a small-scale photovoltaic power generation system, as shown in FIG. 7B, a micro inverter (power conditioner) is used for each panel. Are known. This system detects the maximum power point for each panel. Since the microinverter is directly connected to a terminal box installed on the panel, the microinverter has a box-type housing having a waterproof structure for outdoor use. As shown in FIG. 6A, there are methods for attaching to the internal substrate, such as screw fastening, soldering with a crimp terminal, or direct soldering of the core wire.

JP 2004-214475 A

  However, in the conventional solar power generation system connector structure, in order to secure the function of the prevention structure, as shown in FIGS. It is a structure that tightens the nut from the inside. Therefore, there is a problem that it takes time and work efficiency is poor. Furthermore, as shown in Figs. 5 (A) and 5 (B), the nut tightening structure requires screws, nuts, waterproof caps, etc., which increases the number of components, which takes time for inventory management, and the assembly man-hours. There is also a problem that increases. The connector structure for a photovoltaic power generation system according to the present invention has been proposed in order to solve such problems.

  The gist for solving the above problems of the connector structure for a photovoltaic power generation system according to the present invention and achieving the object is to sandwich an attachment hole that is penetrated for connector attachment of a housing for a micro inverter in the photovoltaic power generation system. A board connector having a bayonet lock structure connection portion mounted on a printed circuit board inside the housing and disposed toward the attachment hole, and opposed to the attachment hole outside the housing. A panel connector having a connecting portion that is disposed and inserted through the mounting hole to be complementarily connected to the connecting portion of the bayonet lock structure of the board connector; and the outer peripheral surface of the mounting hole portion in the housing; It consists of a waterproof packing that is interposed between the mounting flanges of the panel connector, and one of the bayonet lock structures is for fitting Grooves carved in the circumferential direction in the cylindrical body are provided at two locations in the front-rear direction, which is the insertion / extraction direction, and the other connection part of the bayonet lock structure is projected on the peripheral wall surface for fitting and fits into the groove It is a projection to be.

  One connection portion of the bayonet lock structure is provided in the fitting tube of the panel connector, and one of the two grooves fits into the mounting hole of the housing, and the other groove Is to be fitted into the connecting portion of the board connector.

  Further, as a reverse of the fitting state of the groove and the protrusion, the groove for fitting in one connection portion of the bayonet lock structure is a groove engraved on the inner peripheral wall surface of the mounting hole of the housing, It is a groove carved in the connection part of the board connector, and a projection that fits into the two grooves is provided in the connection part of the panel connector.

  When there is a groove on the panel connector side, the one groove is fitted to the mounting hole of the housing so that the packing is crushed in a desired amount, and the other groove is front and rear with respect to the connection portion of the board connector. It is set to fit loosely in the direction.

  The fitting state in the front-rear direction between the one groove and the mounting hole of the housing is adjusted by setting the front end position of the engaging protrusion provided in the mounting hole.

  When there is a groove on the board connector side and the housing side, the groove engraved on the inner peripheral wall surface of the housing mounting hole is for the panel so that the desired amount of packing is crushed against the housing mounting hole. The groove which is fitted to the protrusion in the connector and is engraved in the connection portion of the board connector includes being set so as to be loosely fitted in the front-rear direction with respect to the connection portion of the panel connector.

  According to the connector structure for a photovoltaic power generation system of the present invention, the panel connector is firmly fixed to the housing by the bayonet lock structure having double grooves, and the board connector inside the housing is The fitting stress can be prevented. Further, the connection work between the board connector and the panel connector is simple and easy, and the work efficiency is improved. In addition, since the number of parts is reduced, the inventory management becomes easy and the cost is reduced.

They are the front side perspective view (A) which concerns on 1st Example of the connector structure for photovoltaic power generation systems which concerns on this invention, the front side perspective view (B) of the locked state, and the back side perspective view (C). It is the back side perspective view (A) concerning the 1st example of the connector structure for photovoltaic power generation systems concerning the present invention, and the back side perspective view (B) made into the state without the case (panel). The longitudinal sectional view (A) according to the first embodiment of the connector structure for a photovoltaic power generation system according to the present invention, the partially enlarged sectional view (B), and the relationship between the engagement protrusion 2b and the second groove 5e. It is a partial sectional view (C) for explanation showing that the amount of crushing of packing 6 is set. It is a table | surface figure which shows the number of parts of the connector structure by the bayonet type in the solar energy power generation system which concerns on this invention. It is a table | surface figure which shows the number of parts of the connector structure in the solar energy power generation system which concerns on a prior art example. It is the longitudinal cross-sectional view (A) in the Example of the connector structure (2 examples) in the photovoltaic power generation system which concerns on a prior art example, (B). It is the layout (A) and (B) of a well-known photovoltaic power generation system.

  As shown in FIGS. 1 to 3, the connector structure for a photovoltaic power generation system according to the present invention is electrically connected only by inserting and fitting the panel connector from the outside of the housing by the bayonet lock structure. The base connector is not subjected to fitting stress.

  As shown in FIGS. 1A to 1C, a connector structure 1 of a solar power generation system according to the present invention has a mounting hole 2a that is penetrated for mounting a connector of a housing 2 for a micro inverter in the solar power generation system. A board connector 4 is mounted on the printed board 3 by soldering, press-in, surface mounting, or the like inside the housing 2 with a connection portion 4a disposed toward the mounting hole 2a. is there.

  A panel connector having a connection portion 5a that is disposed on the outside of the housing 2 so as to oppose the attachment hole 2a and that is inserted through the attachment hole 2a and complementarily connects to the connection portion 4a of the board connector 4. 5 (in FIG. 1A, the left side shows a connector plug, and the right side shows a connector jack).

  As shown in FIGS. 2A and 2B, a waterproof packing interposed between the outer peripheral surface of the mounting hole 2a portion of the housing 2 and the mounting flange 5b of the panel connector 5 is provided. There are six. The packing 6 is controlled in its crushing amount, and can adjust the fixing force with respect to the panel 2.

  The connection between the connection portion 4a of the board connector 4 and the connection portion 5a of the panel connector 5 has a bayonet lock structure. The board connector 4 is mounted on the printed board 3.

  The bayonet structure is first provided on the board connector 4 side, as shown in FIG. 3 (B), in the cylindrical connection portion 4a along the longitudinal direction inward from the tip portion thereof, and A plurality of slits 4c are provided in the direction at appropriate intervals. The slit 4c, when fitted, allows the connecting portion 4a to bulge in the radial direction, reduces the addition of the connecting portion 5a of the mating panel connector 5 to be rotated in the circumferential direction, and is tightened with low torque. It is what you want to do.

  Further, an engagement protrusion 4d for engagement protruding inward is provided on the inner peripheral wall surface of the cylindrical connection portion 4a. This engagement protrusion 4d locks the connection portion 5a of the panel connector 5 when fitted. That is, as shown in FIG. 3B, the guide groove 5g in the connection portion 5a is guided to the first groove 5d, and the connection portion 5a is rotated about a half turn so that the periphery of the first groove 5d is obtained. The rotation of the engagement protrusion 4d is stopped and the rotation is stopped when the engagement protrusion 4f for locking provided in the first groove 5d is overcome.

  Since the groove width A of the first groove 5d is wider than the width of the engaging protrusion 4d and has a margin, the assembly tolerance of the board connector 4 can be accommodated.

  Further, as shown in FIG. 3B, an engagement protrusion 2b is provided on the wall surface of the mounting hole 2a of the housing 2. The mating counterpart panel connector 5 is locked in the mounting hole 2 a of the panel 2. At that time, the method for adjusting the crushing amount of the packing 6 includes, for example, a method of changing the diameter of the packing 6, a method of moving the groove position in the front-rear direction of the second groove 5 e in the connecting portion 5 a, and the engagement protrusion A method of changing the position of the front end engaged with the groove 2b is conceivable.

  Any of the above methods can be adopted, but in this embodiment, the front end position of the engaging protrusion 2b is changed. As shown in FIG. 3C, when the front end position 2c of the engagement protrusion 2b moves in the front-rear direction, the rear end position 2d of the panel 2 changes back and forth, and the amount of crushing the packing 6 changes. .

  As shown in FIG. 3B, the connection portion 5a of the panel connector 5 is provided with a first groove 5d and a second groove 5e for locking. This two-stage groove is for the first groove 5d to be fitted and locked with the engaging protrusion 4d of the connecting portion 4a of the mating board connector 4. This is because the second groove 5e is fitted and locked to the engaging protrusion 2b provided in the mounting hole 2a of the housing 2.

  The locked state by the first groove 5d is loosely fitted in the front-rear direction, and the packing 6 is crushed by a required amount in the second groove 5e and tightly fitted in the front-rear direction. As a result, the connecting portion 5a is firmly fixed to the mounting hole 2a of the housing 2 so that the dimensional influence on the board connector 4 is reduced and stress on the board connector 4 is avoided. Is.

  The board connector 4 on the housing 2 side and the panel connector 5 are connected by inserting the panel connector 5 from the mounting hole 2a and connecting the connecting portion 5a to the board connector 4 on the printed board 3. The connection part 4a is fitted and electrically connected. Thereby, troublesome nut tightening work is omitted.

  The packing 6 is inserted into the connecting portion 5 a of the panel connector 5. When the panel connector 5 is inserted into the mounting hole 2a and connected to the board connector 4, the panel connector 5 is sandwiched between the mounting flange 5b and the outer peripheral surface of the housing 2 and exhibits a waterproof action. .

  As described above, the first embodiment has a bayonet structure as shown in FIGS. 1A to 1C, and the connection portion 5 a is inserted into the attachment hole 2 a and fitted into the connection portion of the board connector 4. The lock is completed by rotating about half a turn along the groove of the bayonet structure. In the bayonet structure, the engagement protrusions of the fitting groove and the mating engagement protrusions engaged with the engagement groove are provided, for example, in two or more locations in the circumferential direction or in one location.

  As described above, the fitting method between the connection portion of the board connector and the connection portion of the panel connector is a bayonet structure, and as shown in FIG. 4, the number of parts is the board connector 4 and the panel connector 5. Compared with the case of FIG. 5 showing the number of parts in the conventional example, the number of parts is clearly reduced, and the connector 2 for board on the housing 2 side is not subjected to tightening stress. 4 assembly tolerances are allowed. Also, the connection workability is much easier than before and the work performance is improved.

  In the illustrated embodiment, the fitting groove is provided on the panel connector 5 side. However, the present invention is not limited to this, and the bayonet lock is assumed to have a reversed fitting state between the groove and the protrusion. The groove for fitting in one connection part of the structure is a groove for the panel, as a groove carved in the inner peripheral wall surface of the mounting hole 2a of the housing 2 and a groove carved in the connection part 4a of the board connector 4 Even if the connection portion 5a of the connector 5 is provided with protrusions that fit into the two grooves, the same operation and effect can be achieved.

  Further, the groove formed on the inner peripheral wall surface of the mounting hole 2a of the housing 2 is fitted with the protrusion on the panel connector 5 so that the packing 6 is crushed by a desired amount with respect to the mounting hole 2a of the housing 2. The groove formed in the connection portion 4 a of the board connector 4 can be set so as to be loosely fitted in the front-rear direction with respect to the connection portion 5 a of the panel connector 5. Such setting can be performed in the same manner as the method shown in FIG.

  The connector structure of the photovoltaic power generation system according to the invention according to the present invention can be widely applied to other electrical connection parts.

1 Connector structure of solar power generation system,
2 housing, 2a mounting hole,
2b engagement protrusion, 2c front end position,
2d rear end position,
3 printed circuit boards,
4 Board connector, 4a connection part,
4b contact, 4c slit,
4d engaging protrusion,
5 Panel connector, 5a Connection part,
5b Mounting flange, 5c Contact,
5d first groove, 5e second groove,
5f engagement protrusion, 5g introduction groove,
6 Packing.

Claims (6)

With a mounting hole penetrated for mounting the connector of the micro inverter housing in the solar power generation system,
A board connector having a bayonet lock structure connection portion mounted on a printed board inside the housing and arranged toward the mounting hole;
A panel connector having a connection portion that is disposed on the outside of the housing so as to oppose the attachment hole and that is inserted through the attachment hole and complementarily connected to the connection portion of the bayonet lock structure of the board connector; ,
A waterproof packing interposed between the outer peripheral surface of the mounting hole portion in the housing and the mounting flange of the panel connector,
One connection part of the bayonet lock structure is provided in two places in the front-rear direction in which the groove formed in the circumferential direction on the fitting cylinder is the insertion / extraction direction,
The other connecting portion of the bayonet lock structure is a protrusion that protrudes from the peripheral wall surface for fitting and fits into the groove,
A connector structure for a photovoltaic power generation system. One connection part of the bayonet lock structure is provided in the fitting cylinder of the panel connector, one of the two grooves is fitted into the mounting hole of the housing, and the other groove is Fitting into the connection portion of the board connector;
The connector structure for a photovoltaic power generation system according to claim 1. The fitting groove in one connection part of the bayonet lock structure is a groove carved in the inner peripheral wall surface of the mounting hole of the housing and a groove carved in the connection part of the board connector. A projection that fits into the two grooves is provided in the connection portion of the connector for the connector,
The connector structure for a photovoltaic power generation system according to any one of claims 1 to 3. One groove is set so that the packing is crushed in a desired amount with respect to the mounting hole of the housing, and the other groove is set so as to be loosely fitted in the front-rear direction with respect to the connection portion of the board connector,
The connector structure for a solar power generation system according to claim 2. The fitting state in the front-rear direction between the one groove and the mounting hole of the housing is adjusted by setting the front end position of the engaging protrusion provided in the mounting hole;
The connector structure for a photovoltaic power generation system according to claim 4. The groove formed on the inner peripheral wall surface of the mounting hole of the housing fits with the protrusion on the panel connector so that the desired amount of packing is crushed with respect to the mounting hole of the housing, and is cut into the connection portion of the board connector. The provided groove is set so as to fit loosely in the front-rear direction to the connection part of the panel connector,
The connector structure for a photovoltaic power generation system according to claim 3.

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