JP2008077971A - Thermal relay unit with supersaturated reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal relay unit with supersaturated reactor which can respond simply to specification change at the time of adding a thermal relay with supersaturated reactor to an electromagnetic switch and is improved in assembly structure so that coil lead wires of the reactor may be wired safely. <P>SOLUTION: The thermal relay unit with supersaturated reactor 3 is externally attached with a supersaturated reactor 3 to be connected in parallel to its built-in heat element on a thermal relay 2 used in combination with an electromagnetic switch 1. Supersaturated reactors of each phase are supported in a lot on a dedicated installation base plate 6 separated from the electromagnetic switch and combined to the side part of the thermal relay, and two of coil lead wires 3c, 3d of the supersaturated reactors are drawn out upward from the opposite side of the installation base plate 6, and then, the coil lead wires are connected to a load side terminal and a power supply side terminal of the thermal relay. Here, an installation seat 6a is provided at the end part of the installation base plate 6, and this installation base plate is superposed on the seating portion 1b of the electromagnetic switch and jointly fixed to the board. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an assembly structure of a thermal relay unit in which a supersaturation reactor is combined with a thermal relay applied to a motor power supply circuit in combination with an electromagnetic switch.

  As is well known, in an electromagnetic switch (electromagnetic contactor) applied to a motor power circuit that starts with a load having a large inertia, an electromagnetic switch is used in order to coordinate protection with a higher-level circuit breaker. Is combined with a delay-type thermal relay (thermal overload relay) to prevent tripping during motor start-up, and in general a standard-type thermal relay (without a supersaturated reactor) attached to an electromagnetic switch is an oversaturated reactor. Is attached externally, and this supersaturated reactor is connected in parallel with a heat element (bimetal heating heater) built in the thermal relay to construct a delay type thermal relay (see, for example, Patent Document 1).

  Next, FIGS. 4 to 6 show conventional configurations in a state where a supersaturated reactor is externally attached to the thermal relay and connected to an electromagnetic switch. 4 is an overall external view, FIG. 5 is an external view of the thermal relay alone, and FIG. 6 is a circuit diagram. In each figure, 1 is an electromagnetic switch (electromagnetic contactor), 2 is a standard thermal relay which is an optional unit of the electromagnetic switch, 3 is a supersaturated reactor externally attached to the thermal relay 2, 4 is an electromagnetic switch 1, A mounting base plate in which the thermal relay 2 and the supersaturated reactor 3 are mounted together, and this assembly unit is installed in a panel such as a switchboard or a control panel and connected to a motor power circuit. The mounting base plate 4 is fixed to a vertical mounting surface in the panel so that the electromagnetic switch 1 is disposed in a forward posture.

  Here, the thermal relay 2 includes a rod terminal (power-side terminal) 2a protruding toward the load-side terminal (screw terminal) 1a of the electromagnetic switch 1, a load-side terminal 2b, an auxiliary terminal 2c, and a bimetal heating inside. The rod terminal 2a is inserted and connected to the load side terminal (screw terminal) 1a of the electromagnetic switch in a state where the heat element 2f (see FIG. 6) is provided and assembled to the electromagnetic switch 1. Reference numeral 2d is an adjustment dial, and 2e is a reset button. On the other hand, the supersaturated reactor 3 has a structure in which a coil 3b is wound around an iron core (winding iron core) 3a, and coil lead wires (insulation-coated wires) 3c and 3d at the beginning and end of winding are drawn up and down from the coil 3b. The supersaturated reactors 3 for each phase (R, S, T phase) are distributed on the periphery of the thermal relay 2 and mounted on the mounting base plate 4.

Of the two lead wires drawn from the coil 3 b of the reactor 3 with the thermal relay 2 connected to the electromagnetic switch 1, the lead wire 3 c drawn upward is together with the rod terminal 2 a of the thermal relay 2. The other lead wire 3d that is inserted and connected to the load side terminal (screw terminal) 1a of the electromagnetic switch 1 and drawn downward is routed to the front side of the thermal relay 2 and then the load side terminal ( The supersaturated reactor 3 is connected in parallel to the built-in heat element 2f of the thermal relay 2 (see FIG. 6).
Japanese Utility Model Publication No. 3-12339 (FIGS. 1 to 5)

Incidentally, the conventional assembly structure shown in FIG. 4 has the following problems.
That is, an external supersaturated reactor 3 is mounted on a common mounting base plate 4 together with the electromagnetic switch 1 and the thermal relay 2. For this reason, in order to change the specifications by adding a supersaturated reactor to the existing electromagnetic switch and standard thermal relay in the panel, the existing mounting base plate (without a supersaturated reactor) is changed to a large mounting base plate 4 In this case, it is troublesome to perform the replacement work performed at the installation site such as reworking the position of the mounting hole of the base plate 4 in accordance with the internal structure of the panel. Further, in the wiring structure in which the lead wire 3d of the supersaturated reactor 3 is drawn from the lower side of the coil 3b and is routed between the load side terminal 2b of the thermal relay 2 as shown, the lead wire (insulation coated wire) 3d is Touching the ground-side mounting base plate 4 and applying vibration to it may damage the insulation coating of the lead wire 3d and cause a ground fault.

  The present invention has been made in view of the above points, and its purpose is to solve the above-mentioned problems and easily cope with specification changes when retrofitting a supersaturated reactor, and further contact the mounting base plate on the wiring surface. It is an object of the present invention to provide a thermal relay unit with a supersaturated reactor whose assembly structure has been improved so that the lead wire of a reactor coil can be safely routed and wired between the thermal relay without fear of a ground fault.

In order to achieve the above object, according to the present invention, in a thermal relay unit with a supersaturated reactor in which a thermal relay used in combination with an electromagnetic switch is externally attached with a supersaturated reactor connected in parallel with the built-in heat element,
The supersaturated reactor of each phase is collectively supported on a dedicated mounting base plate separated from the electromagnetic switch and arranged on the side of the thermal relay, and the two supersaturated reactor coil lead wires are connected to the mounting base plate. After leading upward from the opposite side, the coil lead wire is connected to the load side terminal and the power source side terminal of the thermal relay.

Here, the mounting base plate is provided with a mounting seat that is fastened to the pedestal portion of the electromagnetic switch, and the reactor mounting base plate is overlapped with the pedestal portion of the electromagnetic switch together when installed in the panel. It is made to mount in (claim 2).
Of the two lead wires drawn out from the coil of the supersaturated reactor, one lead wire is connected to the load side terminal of the thermal relay, and the other lead wire has the thermal relay assembled to the electromagnetic switch. In this state, it is connected to the load-side terminal of the electromagnetic switch together with the rod terminal of the main circuit protruding from the thermal relay, or is connected to the rod terminal via a plug-in crimp terminal (Claim 3).

According to the above configuration, the specification changes when adding a thermal relay with a supersaturated reactor to an electromagnetic switch by combining each phase of the supersaturated reactor on a separate dedicated mounting base plate and combining it with a thermal relay. Can be handled with simple assembly work.
Moreover, the two lead wires of the supersaturated reactor are drawn upward from the side opposite to the mounting base plate, and then routed between the thermal relay and wired so that the lead wire touches the mounting base plate. This can ensure a high level of safety without causing a ground fault.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. 1 is a perspective view of a state where a thermal relay unit with a supersaturated reactor is assembled to the electromagnetic switch, FIG. 2 is a plan view of the state before the thermal relay unit is assembled to the electromagnetic switch, and FIG. 3 is an outline view of the supersaturated reactor. In the drawings of the embodiment, members corresponding to those in FIGS. 4 and 5 are denoted by the same reference numerals and description thereof is omitted.

  That is, in the thermal relay unit of the illustrated embodiment, three supersaturated reactors 3 corresponding to the R, S, and T phases are aligned and mounted on a dedicated mounting base plate 6, and the assembly of the supersaturated reactor is thermally treated. The thermal relay unit is constructed by arranging the lead wires 3c and 3d drawn from the coil of each supersaturated reactor 3 to the power supply side and load side terminals of the thermal relay 2 after being arranged on the side of the relay 2.

  Here, each of the supersaturated reactors 3 is fixed on the mounting base plate 6 via mounting legs 3e provided on the bobbin of the coil 3b. Further, as shown in FIG. 3, both the lead wires 3 c and 3 d of the reactor coil are drawn from the upper surface opposite to the mounting base plate 6, and among these, the lead wire 3 d is thermally connected via the crimp terminal 5. It is connected to the load side terminal (screw terminal) 2b of the relay 2.

On the other hand, a tab-shaped mounting seat 6a and mounting seat 6b are formed on the mounting base plate 6, and the mounting seat 6a is projected from the end of the mounting base plate 6 toward the base portion 1b of the electromagnetic switch 1. .
When this thermal relay unit is combined with the electromagnetic switch 1 and installed in the panel, the mounting seat 6a of the mounting base plate 6 on which the supersaturated reactor 3 is mounted is used as the base of the electromagnetic switch 1 as shown in FIG. It is inserted into the back side of the part 1a, overlapped, and fastened together with bolts and fixed in the panel together with the electromagnetic switch. The thermal relay 2 is assembled by inserting the rod terminal 2a into the load side terminal 1a of the electromagnetic switch 1 and inserting the coil lead wire 3c of the supersaturated reactor 3 together with the load side terminal (screw terminal) 1a. To do.

  Alternatively, the lead wire connection method disclosed in the above-mentioned Patent Document 1 is adopted, an insertion crimp terminal is attached to the tip of the lead wire 3c, and the crimp terminal is connected to the rod of the thermal relay 2. It is also possible to press-fit and connect to an insertion protrusion branched from the terminal (power supply side terminal) 2a.

1 is an external perspective view of an assembled state in which a thermal relay unit with a supersaturated reactor according to an embodiment of the present invention is assembled to an electromagnetic switch Plan view of the state before the thermal relay unit of Fig. 1 is assembled to the electromagnetic switch External perspective view of supersaturated reactor in FIG. External perspective view of an assembled state in which a conventional thermal relay unit with a saturated reactor is assembled to an electromagnetic switch External perspective view of thermal relay alone Circuit diagram of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic switch 1a Load side terminal 1b Base part 2 Thermal relay 2a Rod terminal (power supply side terminal)
2b Load side terminal 2f Heat element 3 Supersaturated reactor 3b Coil 3c, 3d Lead wire 6 Reactor mounting base plate

Claims (3)

In the thermal relay unit with a supersaturated reactor, which is an externally connected supersaturated reactor connected in parallel with the built-in heat element to the thermal relay used in combination with the electromagnetic switch,
The supersaturated reactors of each phase are collectively supported on the dedicated mounting base plate and arranged on the side of the thermal relay, and both coil lead wires of the supersaturating reactor are drawn upward from the opposite side of the mounting base plate. A thermal relay unit with a supersaturated reactor, wherein the coil lead wire is connected to the load side terminal and power source side terminal of the thermal relay. 2. The thermal relay unit with a supersaturated reactor according to claim 1, wherein a mounting base plate is provided with a mounting base that is fastened together with a base portion of the electromagnetic switch. 2. The thermal relay unit according to claim 1, wherein one of the two lead wires drawn from the coil of the supersaturated reactor is connected to the load side terminal of the thermal relay, and the other lead wire is electromagnetic. A thermal relay unit with a supersaturated reactor, which is connected to the load-side terminal of the switch or the power-side rod terminal that protrudes from the thermal relay and connects to the load-side terminal of the electromagnetic switch.

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