CN113646861A

CN113646861A - Electromagnetic contactor

Info

Publication number: CN113646861A
Application number: CN201980094921.XA
Authority: CN
Inventors: 林亨
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2019-04-10
Filing date: 2019-04-10
Publication date: 2021-11-12
Also published as: JPWO2020208758A1; WO2020208758A1; JP6689469B1

Abstract

The electromagnetic contactor is provided with an electric wire holder (41), the electric wire holder (41) restrains the axial movement of an electric wire (42) arranged between a fixed part (61) and a flexible part (62), the fixed part (61) and the flexible part (62) are respectively provided with corner parts (64, 65, 66, 67, 68), the corner parts (64, 65, 66, 67, 68) are provided with edges formed by intersecting lines of planes and extending in a direction orthogonal to the axial direction of the electric wire (42), and the corner parts (66, 67) of the fixed part (61) and the corner parts (64, 65, 68) of the flexible part (62) are arranged at different positions in the axial direction of the electric wire (42).

Description

Electromagnetic contactor

Technical Field

The present invention relates to an electromagnetic contactor that opens and closes a current path.

Background

The electromagnetic contactor is provided in a current path between a power source and a load, and opens and closes the current path. In the electromagnetic contactor, a spring type in which an end portion of the electric wire from which the coating layer is peeled is held by a pressure of a spring, and a screw type in which an end portion of the electric wire from which the coating layer is peeled is held by a screw are used as a terminal for fixing the electric wire.

The spring terminal is a terminal that holds a conductor portion of an electric wire between a fixed conductive metal member and a movable spring and ensures electrical conduction between the conductor portion of the electric wire and the conductive metal member. The spring terminal is always pressed by the spring action, and unlike the screw type terminal, the spring terminal does not require skill in wiring, and the wiring quality is stable regardless of the person. Further, the spring terminal does not loosen even after the wiring and has excellent maintainability.

Since the electric wire wired to the terminal is often wired in the vicinity of the plate surface on which the electromagnetic contactor is mounted, the electric wire is bent from the wire insertion opening in which the terminal is disposed toward the plate surface. The wires oriented in the plate surface direction are bundled by a bundling machine and fixed to the plate surface.

The electric wire on the plate surface is fixed, but the electromagnetic contactor vibrates by its own action. Therefore, when the electric wire is directly wired to the spring terminal, the electric wire may swing due to vibration of the control board or the device or operation vibration of the contactor itself, and the electric wire conductor may be broken at the contact portion between the spring and the electric wire conductor portion. In particular, when the electric wire is a twisted wire, the electric wire itself is thin, and therefore, the possibility of wire breakage is high.

Patent document 1 discloses an electromagnetic contactor having a holding projection for holding an electric wire wired to a terminal. In the electromagnetic contactor disclosed in patent document 1, the electric wire is fixed by clamping the electric wire by the plate-like portion of the holding boss and the mounting plate.

Patent document 1: japanese patent laid-open publication No. 2018-113141

Disclosure of Invention

The electromagnetic contactor disclosed in patent document 1 clamps the electric wire between the plate-like portions, and therefore the pressure for clamping the electric wire is dispersed. Therefore, when the electromagnetic contactor vibrates, the electric wire may be displaced in the axial direction of the electric wire. If the electric wire is displaced in the axial direction, the wire is likely to be broken due to a large swing of the electric wire caused by vibration of the control board or the device or operation vibration of the contactor itself.

The present invention has been made in view of the above circumstances, and an object thereof is to obtain an electromagnetic contactor capable of suppressing disconnection of an electric wire in a terminal wiring.

In order to solve the above-described problems and achieve the object, the present invention includes a wire holder having a 1 st portion and a 2 nd portion opposed to the 1 st portion, and suppressing an axial movement of a wire arranged between the 1 st portion and the 2 nd portion. The 1 st and 2 nd parts each have at least one corner portion in contact with the covering layer of the electric wire, and the corner portion has an edge formed by intersecting lines of planes and extending in a direction orthogonal to the axial direction of the electric wire. The corner of the 1 st portion and the corner of the 2 nd portion are provided at different positions in the axial direction of the electric wire.

ADVANTAGEOUS EFFECTS OF INVENTION

The electromagnetic contactor according to the present invention has an effect of suppressing disconnection of an electric wire wired to a terminal.

Drawings

Fig. 1 is a perspective view of an electromagnetic contactor according to embodiment 1 of the present invention.

Fig. 2 is a front view of the electromagnetic contactor according to embodiment 1.

Fig. 3 is a sectional view of the electromagnetic contactor according to embodiment 1.

Fig. 4 is a diagram showing a state in which a wire thicker than the interval between the fixed portion and the fixed portion is arranged on the wire holder of the electromagnetic contactor according to embodiment 1.

Fig. 5 is a diagram showing a state in which electric wires narrower than the interval between the fixed portion and the fixed portion are arranged in the electric wire holder of the electromagnetic contactor according to embodiment 1.

Fig. 6 is a diagram showing a state in which a combination pipe is attached to a wire connected to the electromagnetic contactor according to embodiment 1.

Fig. 7 is a sectional view of the electromagnetic contactor according to embodiment 1.

Fig. 8 is a side view of the electromagnetic contactor according to embodiment 1.

Detailed Description

Hereinafter, an electromagnetic contactor according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments.

Embodiment 1.

Fig. 1 is a perspective view of an electromagnetic contactor according to embodiment 1 of the present invention. Fig. 2 is a front view of the electromagnetic contactor according to embodiment 1. Fig. 3 is a sectional view of the electromagnetic contactor according to embodiment 1. Fig. 3 shows a cross section along the line III-III in fig. 2. Fig. 4 is a diagram showing a state in which a wire thicker than the interval between the fixed portion and the fixed portion is arranged on the wire holder of the electromagnetic contactor according to embodiment 1. The electromagnetic contactor 40 closes or opens the current to the load device. The electromagnetic contactor 40 has a power source side wire insertion port 1, a load side wire insertion port 2, a wire insertion port 3 for wiring a signal wire, and a wire insertion port 4 for driving the electromagnetic contactor 40. The wire insertion port 1, the wire insertion port 2, and the wire insertion port 3 have the same shape.

The

wire insertion ports

1, 2, 3, and 4 are provided with spring type terminals 30 that hold the conductor part of the wire 42 between the fixed conductive metal fitting 21 and the movable spring 20 to ensure conduction between the wire conductor part 23 and the conductive metal fitting 21. The spring terminal 30 has a structure in which the wire 42 from which the coating layer has been peeled can be directly sandwiched by the spring 20 for wiring. An insertion port member 43 having a cylindrical portion 43a is provided in the

wire insertion ports

1, 2, 3, 4, and if the end portion of the wire 42 is inserted into the cylindrical portion 43a, the end portion of the wire 42 is guided between the conductive metal fitting 21 and the spring 20. The spring type terminals 30 provided at the

wire insertion ports

1, 2, 3, and 4 are always surely crimped, and unlike the screw type, no skill is required in wiring, and the wiring quality is stable regardless of the person. The spring terminal 30 does not loosen even after the wiring and has excellent maintainability. As described above, the

wire insertion ports

1, 2, 3, 4 have the spring-type terminal 30 as a terminal electrically connected to the inserted wire 42.

The electromagnetic contactor 40 is provided with a tool insertion port 5 for inserting or removing the electric wire 42. The electromagnetic contactor 40 inserts or removes the electric wire 42 after the operation tool is inserted into the tool insertion port 5 and the spring 20 is released.

The electromagnetic contactor 40 is provided with a wire holder 41 around the wire insertion port 3. The wire holder 41 has a fixed portion 61 as a 1 st portion and a flexible portion 62 as a 2 nd portion. The fixed portion 61 is fixed in position, and the flexible portion 62 has elasticity and is disposed opposite to the fixed portion 61. The flexible portion 62 is supported by the cantilever beam so as to stand upright from the stationary portion 61 in an arch shape, and is thereby given elasticity. The electric wire 42 wired to the wire insertion port 3 is bent to pass through the wire holder 41 and to climb toward the plate surface 6. The wire holder 41 has an opening 44 formed therein, and a portion where the fixed portion 61 and the flexible portion 62 are not connected to each other. Therefore, the wire holder 41 can dispose the wire 42 even after the wire 42 is wired to the wire insertion port 3.

The stationary portion 61 has a 1 st stationary face 71 and a 2 nd stationary face 70. The 1 st non-contact surface 71 is a plane perpendicular to the mounting surface 45 of the facing plate surface 6 in the electromagnetic contactor 40. The 2 nd non-contact surface 70 is a plane parallel to the axial direction of the cylindrical portion 43a of the

wire insertion port

1, 2, 3. The corner 67 at the boundary between the 1 st non-moving surface 71 and the 2 nd non-moving surface 70 is not rounded. In addition, the corner 66 of the boundary opposite to the corner 67 among the 1 st non-movable surface 71 is not rounded. Thus, the

corners

66, 67 have edges formed by the intersection of the planes with each other. The edges of the

corner portions

66 and 67 extend in a direction perpendicular to the axial direction of the wire 42 when the wire 42 is disposed in the wire holder 41.

Flexure portion 62 has a 1 st flexure surface 72, a 2 nd flexure surface 73, and a projection 63 projecting perpendicularly from the 2 nd flexure surface 73. The projection 63 extends from the flexible portion 62 toward the immobile portion 61. The corner 68 at the boundary of the 1 st flexure surface 72 and the 2 nd flexure surface 73 is not rounded. In addition, the corner 69 of the boundary opposite to the corner 68 among the 1 st flexible surface 72 is not rounded. The

corner portions

64, 65 adjacent to the front end surface of the projection 63 are not rounded. Thus, the

corners

64, 65, 68, 69 have edges formed by the intersection of the planes with each other. The edges of the

corner portions

64, 65, 68, 69 extend in a direction perpendicular to the axial direction of the wire 42 when the wire 42 is disposed in the wire holder 41.

The electromagnetic contactor 40 is provided with a wire holder 46 around the wire insertion port 4. The wire holder 46 has a fixed portion 93 as a 1 st portion and a flexible portion 92 as a 2 nd portion. The fixed portion 93 is fixed in position, and the flexible portion 92 has elasticity and is disposed to face the fixed portion 93. The flexible portion 92 is formed in an arch shape standing upright from the immovable portion 93 in a cantilever-supported state, and is thereby given elasticity. The electric wire 42 wired to the wire insertion port 4 is bent to pass through the wire holder 46 and is installed to climb toward the plate surface 6. Since the wire holder 46 is provided with the opening 47 and the portion where the stationary portion 93 and the flexible portion 92 are not connected to each other, the wire 42 can be arranged even after the wire 42 is wired to the wire insertion port 4.

The flexible portion 62 has elasticity, and is disposed at a constant interval from the fixed portion 61 in a state where no stress is applied to the flexible portion 62. As shown in fig. 4, the wire 42 routed to the spring terminal 30 is disposed in the wire holder 41. The maximum distance between the fixed portion 61 and the flexible portion 62 in the direction perpendicular to the axial direction of the wire 42 is set to be 0.75mm larger than the maximum wire diameter, i.e., the cross-sectional area when the wire holder 41 is assumed to be applied²Coating outer diameter of the electric wire

The width is about 2.4 mm. The coating layer of the electric wire 42 is thereby elastically pressed by the flexible portion 62 of the wire holder 41. The portions of the covering of the electric wire 42 to be pressed are the

corner portions

64, 65, 67, 68, 69. The

corner portions

64 and 67 are in contact with the electric wire 42 arranged in the wire holder 41 at positions different in the axial direction of the electric wire 42.

The covering of the electric wire 42 is in line contact with the

corner portions

64, 65, 67, 68, 69 in a direction perpendicular to the axial direction of the electric wire 42. The

corners

64, 65, 67, 68, 69 are in line contact with the coating of the electric wire 42 disposed in the wire holder 41, and thereby apply pressure at different positions in the axial direction of the electric wire 42. Therefore, when the electric wire 42 is inserted into the electric wire holder 41, the electric wire 42 is inserted into the electric wire holder 41 in a direction perpendicular to the axial direction of the electric wire 42, and therefore the

corner portions

64, 65, 67, 68, 69 do not inhibit the insertion of the electric wire 42 into the electric wire holder 41. After the electric wire 42 is disposed in the electric wire holder 41, the

corner portions

64, 65, 67, 68, 69 have a large effect of suppressing the movement of the electric wire 42 in the axial direction of the electric wire 42.

Fig. 5 is a diagram showing a state in which electric wires narrower than the interval between the fixed portion and the fixed portion are arranged in the electric wire holder of the electromagnetic contactor according to embodiment 1. The distance between the 1 st non-contact surface 71 perpendicular to the mounting surface 45 of the plate surface 6 and the wire holder 41 of the corner 64 in the electromagnetic contactor 40 is set to about 1.3 mm. Cross-sectional area of 0.3mm²The wire 42 has a wire coating outer diameter of

Left and right. Therefore, the wire 42 routed to the spring terminal 30 is in contact with the corner portion 67 and the corner portion 64 in the wire holder 41.

When the thin electric wire 42 is arranged in the electric wire holder 41, the flexible portion 62 of the electric wire holder 41 does not elastically press the electric wire 42, but the corner portion 67 and the corner portion 64 are in line contact with each other in a direction perpendicular to the axial direction of the electric wire 42 due to the elasticity of the conductor of the electric wire 42 and the elasticity of the covering layer, and the pressing force is applied to the covering layer of the electric wire. Therefore, the effect of suppressing the axial movement of the electric wire 42 to the electric wire 42 can be obtained, not as in the case where the thick electric wire 42 is arranged in the electric wire holder 41.

By holding the electric wire 42 in the vicinity of the inlet member 43, the electric wire 42 wired from the plate surface 6 is once suppressed from vibrating by the wire holder 41 and then wired to the spring terminal 30 through the inlet member 43. Therefore, the repetitive stress at the contact portion of the spring 20 and the electric wire conductor portion 23 is suppressed, and therefore, the disconnection of the electric wire conductor portion 23 can be suppressed.

Fig. 6 is a diagram showing a state in which a combination pipe is attached to a wire connected to the electromagnetic contactor according to embodiment 1. A number pipe 95 may be attached to the electric wire 42 of the electromagnetic contactor 40. The number tube 95 is a number plate that identifies the electrical wire 42, and is sometimes referred to as a wire number. The number tube 95 is a tube having a length of about 10mm to 30mm, and the number or characters of the wiring are printed on the outside of the tube. The electric wire 42 is inserted into the tube and attached to the electric wire 42, and which wire the electric wire 42 is indicated. The number tube 95 is also of a type that is press-fitted to the electric wire 42, but is often of a type that is insert-fitted instead of a press-fitted type, and therefore the number tube 95 sometimes moves along the electric wire 42.

There is a method of restraining the slippage of the number tube 95 by bundling the wired electric wires 42 with a bundler, but this method requires the preparation of a bundler. Further, since the wires 42 are bundled after all the wires 42 are wired, when the number tube 95 of the first wired wire 42 is slid and moved, the operation of returning to the original position is required, which takes a lot of time.

As shown in fig. 6, in the electromagnetic contactor 40 according to embodiment 1, the electric wire 42 to which the number tube 95 is attached is inserted into the electric wire holder 41, whereby the number tube 95 can be prevented from sliding, and therefore, it is not necessary to prepare a bundler. Since the wires 42 can be attached to and detached from the wire holder 41 at any time, the wires 42 can be arranged one by one in the wire holder 41 to prevent the number tube 95 from slipping.

Fig. 7 is a sectional view of the electromagnetic contactor according to embodiment 1. Fig. 7 shows a cross section along line VII-VII in fig. 2. Fig. 7 also illustrates an electric wire 42 not shown in fig. 2. The wire holder 46 is different from the wire holder 41 in structure, and no projection is provided at the flexible portion 92. The

corners

91, 94, 96 in the wire holder 46 are not rounded. Thus, the

corners

91, 94, 96 have edges formed by the intersection of the planes with each other. The edges of the

corner portions

91, 94, 96 extend in a direction perpendicular to the axial direction of the wire 42 when the wire 42 is disposed in the wire holder 46.

The wire holder 46 is provided around the wire insertion port 4, and therefore the wire 42 wired at the wire insertion port 4 is bent between the wire holder 46 and the wire insertion port 4. The bent electric wire 42 abuts at least one of the

corner portions

91, 94, 96 which are not rounded, and the elastic force of the electric wire 42 itself pushes at least one of the

corner portions

91, 94, 96, so that the pressure generated by the contact with the electric wire 42 in the axial direction at right angles is applied to the electric wire 42. Thereby suppressing the movement of the electric wire 42 in the axial direction of the electric wire 42.

Fig. 8 is a side view of the electromagnetic contactor according to embodiment 1. A step 106 is provided between the side surface portion 101, which is one edge of the opening 44, and the flexible portion 62, which is the other edge. Further, a step 103 is provided between the end face 107 of the stationary portion 93, which is one edge of the opening 47, and the flexible portion 92, which is the other edge.

The electric wire 42 is caught by the

steps

103, 106, whereby the

steps

103, 106 function as funnels, and the electric wire 42 is guided into the

wire holders

41, 46. Therefore, by providing the

steps

103 and 106, the degree of freedom in the insertion direction of the electric wire 42 can be provided when the electric wire 42 is inserted into the

electric wire holders

41 and 46, and the electric wire 42 can be easily inserted into the

electric wire holders

41 and 46.

The electromagnetic contactor 40 according to embodiment 1 can prevent the wires 42 arranged in the

wire holders

41 and 46 from being displaced in the axial direction of the wires 42, and can suppress disconnection of the wires 42 wired to the spring-type terminal 30.

The wires inserted into the

wire insertion ports

1 and 2 are thicker than the wires 42 inserted into the signal wire insertion port 3, and therefore have higher strength than the signal wires 42. Therefore, even if the electromagnetic contactor 40 vibrates, the electric wires inserted into the electric

wire insertion ports

1 and 2 are not easily disconnected. Therefore, the electromagnetic contactor 40 according to embodiment 1 is provided with the wire holder 41 only around the wire insertion port 3 for the signal wire, and holds the wire 42 inserted into the wire insertion port 3. In embodiment 1, the electromagnetic contactor 40 has the wire insertion port 1 on the power supply side and the wire insertion port 2 on the load side, but in the case of a configuration having only the wire insertion port 3 for wiring the signal wire, the wire holder 41 may be provided around all the wire insertion ports 3. In embodiment 1, the electromagnetic contactor 40 is provided with the wire insertion ports 3 at both ends of the row of the plurality of

wire insertion ports

1 and 2, but the wire insertion ports 3 may be provided only at one end of the row of the plurality of

wire insertion ports

1 and 2.

In the above description, the fixed-position

immobile portions

61 and 93 are the 1 st portions, and the

flexible portions

62 and 92 having flexibility are the 2 nd portions, but the opposite is also possible. The 1 st site and the 2 nd site may be both fixed sites or both flexible sites having flexibility.

The electromagnetic contactor 40 according to embodiment 1 includes two types of wire holders, i.e., the wire holder 41 and the wire holder 46, but may include only one of them.

The configuration described in the above embodiment is an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified without departing from the scope of the present invention.

Description of the reference numerals

1. 2, 3, 4 wire insertion ports, 5 tool insertion ports, 6 plate surfaces, 20 springs, 21 conductive metal parts, 23 wire conductor parts, 30 spring type terminals, 40 electromagnetic contactors, 41, 46 wire holders, 42 wires, 43 insertion port parts, 43a cylindrical parts, 44, 47 opening parts, 45 mounting surfaces, 61, 93 immovable parts, 62, 92 flexible parts, 63 protrusions, 64, 65, 66, 67, 68, 69, 91, 94, 96 corner parts, 70 No. 2 surface, 71 No. 1 surface, 72 No. 1 flexible surface, 73 No. 2 flexible surface, 95 number tube, 101 side surface parts, 103, 106 steps, 107 end surfaces.

Claims

1. An electromagnetic contactor is characterized in that a magnetic field is applied to a magnetic field,

the electric wire holder is provided with a 1 st part and a 2 nd part opposite to the 1 st part, and restrains the axial motion of the electric wire arranged between the 1 st part and the 2 nd part,

the 1 st portion and the 2 nd portion each have at least one corner portion in contact with the covering layer of the electric wire, the corner portion having an edge formed by intersecting lines of planes and extending in a direction orthogonal to an axial direction of the electric wire,

the corner of the 1 st portion and the corner of the 2 nd portion are provided at different positions in the axial direction of the electric wire.

2. The electromagnetic contactor as claimed in claim 1,

the wire holder is fixed by clamping the wire by the 1 st portion and the 2 nd portion.

3. The electromagnetic contactor according to claim 1 or 2,

at least one of the 1 st and 2 nd portions is flexible.

4. The electromagnetic contactor as claimed in any one of claims 1 to 3,

at least one of the 1 st part and the 2 nd part has a projection projecting to the other side of the 1 st part and the 2 nd part,

the corner portion is provided in the projection.

5. The electromagnetic contactor as claimed in any one of claims 1 to 4,

the wire holder has an opening formed between the 1 st portion and the 2 nd portion, and a portion where the 1 st portion and the 2 nd portion are not connected to each other is provided.

6. The electromagnetic contactor as claimed in claim 5,

one edge and the other edge of the opening portion constitute a step.

7. The electromagnetic contactor as claimed in any one of claims 1 to 6,

a plurality of wire insertion ports having terminals electrically connected to the inserted wires are arranged in a row,

the plurality of wire insertion ports include the wire insertion port for a signal wire and the wire insertion port for a power supply wire,

the wire holder is provided at the wire insertion port for the signal wire.

8. The electromagnetic contactor as claimed in claim 7,

the wire insertion ports for signal wires are disposed at least at one of both end portions of a row of the plurality of wire insertion ports.