JP6024439B2 - Magnetic contactor - Google Patents

Description

  The present invention relates to an electromagnetic contactor that opens and closes a current supplied to an electrical load device such as an electric motor.

  The electromagnetic contactor is disposed in the energization path in the casing, and goes straight with respect to the direction in which the pair of conductive parts extend, and the stationary contact having a pair of conductive parts spaced apart from each other while maintaining a predetermined distance. A movable contact having a movable contact that moves in a direction and contacts and separates from a fixed contact provided on a pair of conductive parts, a fixed iron core, and an electromagnet having a movable iron core disposed so as to be attracted to the fixed iron core, and the movable It is an apparatus which arrange | positioned the movable support part which supported the contactor and was connected with the said movable iron core of the said electromagnet (for example, patent document 1).

In the electromagnet of the apparatus of Patent Document 1, an electromagnetic coil is wound around a pair of fixed iron cores. When the movable iron core is attracted to the fixed iron core by exciting the electromagnetic coil, the movable contact and the fixed contact are electrically connected. Connect to.
Here, an electromagnetic having an electromagnet having two types of electromagnetic coils: a closing electromagnetic coil that attracts a movable iron core to a pair of fixed iron cores, and a holding electromagnetic coil that holds the movable iron core adsorbed to a pair of fixed iron cores A contactor is known (for example, Patent Document 2).

  The electromagnetic contactor disclosed in Patent Document 2 includes a change-over switch that supplies an exciting current to a closing electromagnetic coil and a holding electromagnetic coil, and this change-over switch is disposed inside a casing that covers the periphery of the electromagnet. .

JP 2000-331585 A JP 2000-82374 A

By the way, when dust such as abrasion powder generated by the operation of the electromagnet inside the housing comes into contact with the contact of the changeover switch, there is a risk of causing the changeover switch to malfunction or contact poorly.
The present invention has been made in view of the above-described problems, and provides an electromagnetic contactor that prevents a changeover switch from causing malfunction or contact failure due to dust such as wear powder generated in a housing. It is the purpose.

  In order to solve the above-described problem, an electromagnetic contactor according to an embodiment includes an electromagnet, a movable iron core disposed opposite to a stationary iron core of the electromagnet, a movable iron core that supports the movable iron core, and opens and closes a current path. In an electromagnetic contactor that houses a movable support unit connected to a contact mechanism that performs switching and a switching switch that switches an electric path of an exciting current to the electromagnet, the switching switch includes a switch fixed contact and a switch fixed contact in the switch case. A switch movable contact facing the fixed contact and a switch support that supports the switch movable contact so as to be able to contact and separate from the switch fixed contact are housed, and an external mover connected to the switch support includes It has a structure that protrudes to the outside of the switch case through an external opening window provided on the outer wall of the switch case. A switch engaging portion that can be coupled is provided, and the movement of the switch engaging portion is transmitted to the external movable element so that the switch movable contact and the switch fixed contact are contacted and separated, and within the external opening window. A gap existing around the moving outer movable element was closed with a dustproof member.

According to the electromagnetic contactor according to this embodiment, even if dust such as abrasion powder is generated around the electromagnet due to repetition of the interrupted state and the charged state of the electromagnetic contactor, the dustproof member is movable outside the external opening window. Prevents dust from entering the switch case from the gap around the child.
Moreover, the electromagnetic contactor which concerns on one Embodiment is a dust-proof plate with which the said dust-proof member is arrange | positioned along the outer wall of the said switch case, and slides integrally with the said external needle | mover, and obstruct | occludes the said clearance gap.

Moreover, the electromagnetic contactor which concerns on one Embodiment formed the fitting window in the said dust-proof plate, and was made to fit the said external needle | mover with this fitting window.
According to the electromagnetic contactor according to the one embodiment, the dustproof plate is slidably arranged along the outer wall of the switch case, and the dustproof plate is engaged with the external movable element, so that the inside of the switch case is provided. Intrusion of dust can be reliably prevented.

  According to the electromagnetic contactor of the present invention, even if dust such as abrasion powder is generated around the electromagnet due to repetition of the interrupted state and the charged state of the electromagnetic contactor, the dustproof member is disposed around the external mover of the external opening window. It is possible to prevent dust from entering the inside of the switch case from the gap, and it is possible to prevent the changeover switch from causing malfunction or contact failure.

It is a longitudinal cross-sectional view which shows the electromagnetic contactor of the interruption | blocking state which concerns on this invention. It is a figure which shows the electrical connection relationship of the electromagnetic coil which comprises the electromagnet of the electromagnetic contactor which concerns on this invention. It is sectional drawing which shows the changeover switch of the magnetic contactor which concerns on this invention. It is an AA arrow directional view of FIG. It is a perspective view which shows the changeover switch and dust-proof plate of the magnetic contactor which concerns on this invention. It is a top view which shows the state which engaged the dustproof plate with the changeover switch. It is a figure which shows the position of the dust-proof plate engaged with the changeover switch when an electromagnetic contactor is a interruption | blocking state. It is a figure which shows the position of the dust-proof plate engaged with the change-over switch when an electromagnetic contactor is in a closing state. It is a longitudinal cross-sectional view which shows the electromagnetic contactor of the injection state concerning this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing an electromagnetic contactor 10 according to an embodiment of the present invention.
The main body case of the electromagnetic contactor 10 of the present embodiment is mounted so as to cover the lower case 11 made of an insulating material, the upper case 12 made of an insulating material attached to the upper portion of the lower case 11, and the upper opening of the upper case 12. An arc extinguishing cover 13 made of an insulating material is used.

A fixed contact 15 and a terminal plate 16 are fixed to the upper wall of the lower case 11.
The fixed contact 15 and the terminal plate 16 are provided in pairs on the power supply side and the load side (for example, the left side is the power supply side and the right side is the load side), and the upper fixed contact 15 is fixed to the upper portion of the conductive portion 15a. 15 b is provided, and the lower terminal plate 16 is drawn out of the lower case 11.
Then, by attaching the upper case 12 to the upper part of the lower case 11, the fixed contact 15 is accommodated in the internal space of the upper case 12.

An electromagnet 17 is accommodated in the lower space of the lower case 11. The electromagnet 17 includes a pair of left and right fixed iron cores 17a and 17b and a coil holder 17c on the outer periphery of one fixed iron core 17a.
An electromagnetic coil 17d wound through a coil, an electromagnetic coil 17e wound around the outer periphery of the other fixed iron core 17b through a coil holder 17c, and a lower end surface of the pair of fixed iron cores 17a and 17b. The yoke 17f, magnetic pole plates 17g and 17h provided in contact with the upper end surfaces of the pair of fixed iron cores 17a and 17b, and a movable iron core 17i disposed to face the magnetic pole plates 17g and 17h.
The contact mechanism 20 is housed in the upper space of the lower case 11 and the internal space of the upper case 12.

  The contact mechanism 20 includes a contact support 21 and a connecting portion 22 that fixes the movable iron core 17i of the electromagnet 17, and is connected to the upper portion of the movable holder 23. One plate-like movable contact 24 facing the pair of conductive parts 15a on the load side from above, a movable contact 25 provided at a position facing the fixed contact 15b of the movable contact 24, and a contact support A plurality of contact pressure springs 26 connected to the upper part of 21 and applying a spring urging force downward with respect to the movable contact 24, and a plurality of magnetic pole plates 17g, 17h and the connecting portion 22 are arranged, and the movable iron core 17i. And a return spring 27 that urges the core in a direction away from the fixed iron cores 17a and 17b.

  In the electromagnet 17 of this embodiment, an electromagnetic coil 17d wound around the outer periphery of one of the fixed iron cores 17a and 17b is a closing electromagnetic coil (hereinafter referred to as a closing electromagnetic coil 17d). The electromagnetic coil 17e wound around the outer periphery of the other fixed iron core 17b is a holding electromagnetic coil (hereinafter referred to as holding electromagnetic coil 17e).

As shown in FIG. 2, the closing electromagnetic coil 17d and the holding electromagnetic coil 17e are connected in series, and a normally closed contact (b contact) changeover switch 18 is connected in parallel to the holding electromagnetic coil 17e. .
As shown in FIG. 1, the changeover switch 18 is a switch unit 30 disposed inside the switch case 29 and is disposed around the electromagnet 17 in the lower case 11.
Here, a pressing member 28 extending toward the switch unit 30 is formed at the connecting portion 22 of the movable holder 23.

3 to 6 show the configuration of the switch unit 30. FIG.
As shown in FIGS. 3 and 4, the switch case 29 made of an insulating material is formed with a fixing portion 29 a fixed to the lower case 11 via a fixing screw on the lower side.
The switch case 29 is provided with an opening 29b on one side, and a changeover switch 18 composed of two pairs of switch conductive plates 31 is disposed at an internal vertical position so as to be separated from each other.

  A pair of switch conductive plates 31 arranged at the upper part are formed with a lead wire connecting part 32 protruding from the opening 29b of the switch case 29, and a switch fixing contact 33 is formed on the lower surface at a position close to each other. ing. The pair of switch conductive plates 31 arranged in the lower part has the same configuration. As shown in FIG. 2, the lead wire connecting portions 32 of the two pairs of switch conductive plates 31 connect the lead wires 18a on one end side and the lead wires 18b on the other end side to connect the two pairs of switch conductive plates 31 to each other. It is for connecting in parallel (see FIG. 5).

A switch movable contact support 34 is disposed in the center of the switch case 29, and a movable contact pressing spring 35 that applies a spring biasing force to the switch movable contact support 34 in a direction orthogonal to the two pairs of switch conductive plates 31 is disposed. ing.
The switch movable contact support 34 is provided with a pair of switch movable contacts 37 each having a switch movable contact 36, and the switch movable contact support 34 is pressed by the spring biasing force of the movable contact pressing spring 35. Each switch movable contact 36 is connected to the switch fixed contact 33.

As shown in FIGS. 4 and 5, the switch movable contact support 34 has an external movable element 38 that engages with the pressing element 28 formed in the connecting portion 22 of the movable holder 23 described above. It protrudes from the portion 29b.
As shown in FIG. 5, the opening 30 b of the switch case is covered with a switch cover 39. The switch cover 39 is formed with an external opening window 40 for projecting the external movable element 38 to the outside and a plurality of connection window 41 for projecting the lead wire connection section 32 to the outside. Here, the external opening window 40 is formed as a rectangular opening whose longitudinal direction is the direction in which the external movable element 38 moves by engagement with the pressing element 28.

As shown in FIG. 5, the switch unit 30 of this embodiment is provided with a dustproof plate 42 that covers the external opening window 40 of the switch cover 39.
The dustproof plate 42 is formed on the plate body 42 a along the outer surface of the switch cover 39, and a fitting window 42 b formed on the plate body 42 a and having substantially the same shape as the outer peripheral shape of the base of the external movable element 38 of the switch movable contact support 34. The sub-plate 42c is formed at the end of the plate body 42a and enters the space between the pressing element 28 of the movable holder and the inner surface of the lower case 11.

The switch cover 39 is formed with a plurality of slide guides 43. As shown in FIG. 6, the dustproof plate 42 in which the external movable element 38 of the switch movable contact support 34 is fitted into the fitting window 42b is slid. While the left and right edge portions are supported by the guide 43, the guide 43 slides along the switch cover 39.
The housing according to the present invention corresponds to the lower case 11, the upper case 12, and the arc extinguishing cover 13, the switch engaging portion according to the present invention corresponds to the presser 28, and the movable support portion according to the present invention is movable. Corresponding to the connecting portion 22 of the holder 23, the outer wall of the switch case according to the present invention corresponds to the switch cover 39.

Next, the operation of this embodiment will be described.
An electromagnetic force is generated in one fixed iron core 17a by exciting a closing electromagnetic coil 17d of the electromagnet 17 from the electromagnetic contactor 10 in the cut-off state in FIG. Thereby, the movable iron core 17i overcomes the spring biasing force of the return spring 27 and is attracted to the fixed iron core 17a, and the movable holder 23 moves downward. When the movable contactor 24 moves downward, the movable contact 25 is connected to the fixed contact 15b as shown in FIG.

  When the movable holder 23 moves along with the movement of the movable iron core 17i toward the fixed iron core 17a, the switch movable contact support 34 of the switch unit 30 is moved against the movable contact as the presser 28 formed on the movable holder 23 moves downward. It moves against the spring biasing force of the spring 35. Due to the movement of the switch movable contact support 34, the two pairs of switch movable contacts 36 of the changeover switch 18 are in an open state separated from the switch fixed contact 33. As a result, the exciting current flowing in the closing electromagnetic coil 17d is energized to both the closing electromagnetic coil 17d and the holding electromagnetic coil 17e, and electromagnetic force is generated in both the fixed iron cores 17a and 17b. The contact state of 15b is maintained.

Here, in the shut-off state of the magnetic contactor 10 shown in FIG. 1, the dust-proof plate 42 in which the fitting window 42 b is fitted to the external mover 39 has a plate body 42 a as shown in FIG. The external opening window 40 of the external mover 38 formed in 39 is closed.
On the other hand, when the external contactor 38 of the switch unit 30 moves together with the pressing element 28 of the movable holder 23 when the electromagnetic contactor 10 shifts to the closing state, the dustproof plate 42 together with the external movement element 38 switches the switch cover 39. The plate main body 42a always closes the external opening window 40 as shown in FIG.

Next, the effect of this embodiment is demonstrated.
According to the electromagnetic contactor 10 of the present embodiment, the changeover switch 18 is a switch unit 30 built in the switch case 29 and is arranged around the electromagnet 17 in the lower case 11, and the presser 28 of the movable holder 23 is externally connected. Since the switching operation is performed by engaging the movable element 38, the assembly time can be shortened.

  In addition, an external opening window 40 for moving the external movable element 38 of the switch movable contact support 34 is formed in the switch cover 39 of the switch unit 30, but when the magnetic contactor 10 is in a shut-off state and a closed state, The dust-proof plate 42 always closes the external opening window 40. Therefore, even if dust such as wear powder is generated around the electromagnet 17 due to repetition of the cut-off state and the input state of the magnetic contactor 10, the dust is prevented by the dust-proof plate 42 around the external mover 38 of the external opening window 40. It is possible to prevent the inside of the switch unit 30 from entering through the gap, and reliably prevent the changeover switch 18 from causing an operation failure or a contact failure.

  In addition, the dustproof plate 42 of the present embodiment is slidably disposed on the switch cover 39 of the switch unit 30 via the slide guide 43, and the external mover 38 when the magnetic contactor 10 is in the shut-off state and the input state. In addition, it is possible to reliably prevent dust from entering the switch unit 30 with a simple structure in which the external opening window 40 is closed by sliding.

  In the present embodiment, the structure in which the switch unit 30 including the changeover switch 18 is arranged inside the lower case 11 of the electromagnetic contactor 10 is shown. However, if the structure engages with the movement of the movable holder 23, The structure arrange | positioned inside the other main body case different from the lower case 11 of the magnetic contactor 10 may be sufficient.

  DESCRIPTION OF SYMBOLS 10 ... Electromagnetic contactor, 11 ... Lower case, 12 ... Upper case, 13 ... Arc-extinguishing cover, 15 ... Fixed contact, 15a ... Conductive part, 15b ... Fixed contact, 16 ... Terminal board, 17 ... Electromagnet, 17a, 17b ... fixed iron core, 17c ... coil holder, 17d ... throwing electromagnetic coil, 17e ... holding electromagnetic coil, 17f ... yoke, 17g, 17h ... magnetic pole plate, 17i ... movable iron core, 18 ... changeover switch, 18a, 18b ... lead wire, 20 DESCRIPTION OF SYMBOLS ... Contact mechanism, 21 ... Contact support, 22 ... Connecting part, 23 ... Movable holder, 24 ... Movable contact, 25 ... Movable contact, 26 ... Contact pressure spring, 27 ... Return spring, 28 ... Presser, 29 ... Switch case , 29a ... fixed portion, 29b ... opening, 30 ... switch unit, 31 ... switch conductive plate, 32 ... lead wire connecting portion, 33 ... switch fixed contact, 34 ... switch Moving contact support, 35 ... movable contact pressing spring, 36 ... switch movable contact, 37 ... switch movable contact, 38 ... external mover, 39 ... switch cover, 40 ... external opening window, 41 ... connection window, 42 ... dustproof Plate, 42a ... Plate body, 42b ... Fitting window, 42c ... Sub-plate, 43 ... Slide guide

Claims (3)

In the housing, an electromagnet, a movable iron core disposed opposite to the fixed iron core of the electromagnet, a movable support portion connected to a contact mechanism that supports the movable iron core and opens and closes the energization path, and an electric current path for exciting current to the electromagnet In a magnetic contactor that houses a changeover switch that switches between
In the switch case, the changeover switch includes a switch fixed contact, a switch movable contact facing the switch fixed contact, and a switch support portion that supports the switch movable contact so as to be able to contact and separate from the switch fixed contact. And an external movable element connected to the switch support portion has a structure protruding through the external opening window provided on the outer wall of the switch case and projecting to the outside of the switch case,
The movable support portion is provided with a switch engagement portion that can be engaged with the external mover, and the movement of the switch engagement portion causes the switch movable contact and the switch fixed contact to contact and separate from each other. As well as
An electromagnetic contactor characterized in that a gap existing around the external mover moving within the external opening window is closed with a dustproof member.   The electromagnetic contactor according to claim 1, wherein the dustproof member is a dustproof plate that is disposed along the outer wall of the switch case and that slides integrally with the external mover to close the gap.   The electromagnetic contactor according to claim 2, wherein a fitting window is formed in the dust-proof plate, and the external mover is fitted on the fitting window.

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