WO2019186892A1

WO2019186892A1 - Electromagnetic contact apparatus

Info

Publication number: WO2019186892A1
Application number: PCT/JP2018/013246
Authority: WO
Inventors: 和希高橋; 勝俊五十嵐; 小林　篤志
Original assignee: 三菱電機株式会社
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2019-10-03
Also published as: JPWO2019186892A1; CN214012843U; JP6509454B1

Abstract

This electromagnetic contact apparatus (100) comprises a casing (20), fixed contacts (9A, 9B), a mobile contact (10), a cross bar (4), a mobile iron core (2), and a cross bar (41). This electromagnetic contact apparatus (100) comprises a fixed iron core (1) that is face-to-face with the mobile iron core (2), a spring (5), and an excitation coil. This electromagnetic contact apparatus (100) comprises a mechanical selector switch (11) having a cross bar (11a) that is face-to-face with the cross bar (41), and a movable contact point that is coupled to the cross bar (11a), contacting a fixed contact point so that a first current flows, or separating from the fixed contact point so that a second current flows. This electromagnetic contact apparatus (100) comprises a printed base board (17) having a first base board surface (17a) provided with the selector switch (11), and a second base board surface (17b) that is on the reverse side from the first base board surface (17a) side, and a position adjustment member (13) provided between the second base board surface (17b) and the casing (20).

Description

Magnetic contactor

The present invention relates to an electromagnetic contactor including a movable contact and a fixed contact.

The electromagnetic contactor disclosed in Patent Document 1 is provided with a position adjustment mechanism. The position adjustment mechanism is a mechanism for adjusting the position of the changeover switch provided on the printed circuit board. The changeover switch is a mechanical switch having a movable contact connected in series to an exciting coil for generating an electromagnetic force in a fixed iron core, and a fixed contact facing the movable contact. The position adjustment mechanism includes a cylindrical adjustment spacer provided between the printed circuit board and the casing of the electromagnetic contactor, and a screw portion screwed into the center of the adjustment spacer. A male thread portion is formed on the outer peripheral surface of the adjustment spacer. A through hole is formed in the casing of the electromagnetic contactor, and a female screw portion is provided on a wall surface forming the through hole. When the male screw portion is screwed into the female screw portion, the adjustment spacer is rotatably arranged on the casing of the electromagnetic contactor. After the adjustment spacer is arranged in the case of the magnetic contactor, the screw portion is screwed into the changeover switch case via the adjustment spacer and the printed circuit board, so that one end surface of the adjustment spacer in the axial direction is printed. The substrate is in contact with the substrate surface on the side opposite to the changeover switch side. Since the position of the printed circuit board is changed by rotating the adjustment spacer while the adjustment spacer is in contact with the printed circuit board, the first position of the first movable bar provided on the movable contact of the changeover switch is changed to the first position provided on the movable iron core. 2 The width to the tip of the movable bar changes. The first movable bar is arranged to face the second movable bar. The first movable bar and the second movable bar are rod-shaped members for separating the movable contact in contact with the fixed contact of the changeover switch from the fixed contact of the changeover switch during the closing operation. Closure refers to bringing the movable contact into contact with the fixed contact. When the first movable bar is pushed by the second movable bar, the movable contact connected to the first movable bar is separated from the fixed contact.

When the movable contact is in contact with the fixed contact of the changeover switch, the current supplied from the power source flows to the exciting coil through the movable contact in contact with the fixed contact. Thereby, the electromagnetic force of the fixed iron core is increased, and the movable iron core is attracted to the fixed iron core against the spring load of the spring. When the first movable bar is pushed by the second movable bar when the pole is closed, the current supplied from the power source is parallel to the fixed contact of the changeover switch when the movable contact of the changeover switch is separated from the fixed contact. It flows to the exciting coil through a connected resistor. The value of the current flowing through the exciting coil via the resistor is set to a value that is smaller than the value of the current flowing through the exciting coil via the movable contact of the changeover switch and can maintain the closed state. The closed state is a state in which the movable contact is in contact with the fixed contact. As described above, according to the technique disclosed in Patent Document 1, the distance from the first movable bar to the second movable bar is adjusted by using the rotary adjustment spacer, and the movable contact of the changeover switch is closed when the pole is closed. It is possible to adjust the timing at which is separated from the fixed contact. Thereby, at the time of closing, the 1st timing when the movable contact of a changeover switch leaves a fixed contact can be set just before the 2nd timing when a movable iron core contacts a fixed iron core. For this reason, even after the movable contact of the changeover switch has moved away from the fixed contact, the movable core continues to move due to the inertial force of the movable core, and it is reliably closed while suppressing the increase in energy that the movable core collides with the fixed core. Can be made.

Japanese Utility Model Publication No. 01-086146

However, in the electromagnetic contactor disclosed in Patent Document 1, the printed circuit board is indirectly fixed to the casing of the electromagnetic contactor through a screw screwed into the adjustment spacer. For this reason, during the closing operation of the changeover switch, stress concentrates on the contact portion between the printed board and the screw, and the printed board may be damaged.

The present invention has been made in view of the above, and it is possible to obtain an electromagnetic contactor that can change the timing at which the movable contact is separated from the fixed contact at the time of closing and can suppress a decrease in durability of the printed circuit board. With the goal.

In order to solve the above-described problems and achieve the object, the electromagnetic contactor of the present invention includes a housing, a fixed contact provided inside the housing, and a movable contact facing the fixed contact. The electromagnetic contactor includes a first crossbar that is interlocked with the movable contact, a movable iron core that is provided on the first crossbar, and a second crossbar that is provided on the first crossbar. The magnetic contactor includes a fixed iron core that faces the movable iron core, and a spring that pushes the movable iron core in a direction away from the fixed iron core. When the first current flows, the electromagnetic contactor generates an electromagnetic force in the fixed iron core so that the movable iron core is attracted to the fixed iron core against the spring load of the spring and the movable contact is brought into contact with the fixed iron contact. When a second current lower than one current flows, an excitation coil that generates an electromagnetic force in the fixed iron core is provided so as to maintain a state in which the movable contact is in contact with the fixed contact. The magnetic contactor has a columnar member facing the second crossbar and a fixed contact so that the first current flows in conjunction with the columnar member or the second current flows in conjunction with the columnar member. And a mechanical changeover switch having a movable contact that is separated. The electromagnetic contactor is provided between a printed circuit board having a first substrate surface on which a changeover switch is provided, a second substrate surface opposite to the first substrate surface side, and the second substrate surface and the housing. And a position adjusting member for changing the position of the movable contact of the changeover switch.

The electromagnetic contactor according to the present invention has an effect of suppressing a decrease in durability of the printed circuit board while changing the position of the movable contact of the changeover switch.

1st sectional view of the magnetic contactor concerning Embodiment 1 of the present invention. The 2nd sectional view of the magnetic contactor concerning Embodiment 1 of the present invention. First circuit diagram including the changeover switch and the excitation coil shown in FIG. Second circuit diagram including changeover switch and exciting coil shown in FIG. The figure which shows the relationship between the electric current which flows into the exciting coil shown in FIG.3 and FIG.4, and the displacement of a movable iron core The figure which shows the relationship between the spring load of the spring shown to FIG.1 and FIG.2, the electromagnetic force which arises in a fixed iron core, and the displacement of a movable iron core The figure which shows the structural example at the time of thickening the thickness of the position adjustment member shown in FIG. The figure which shows the structural example at the time of reducing the thickness of the position adjustment member shown in FIG. The figure which shows the structure of the electromagnetic contactor which concerns on the 1st modification of Embodiment 1 of this invention. The figure which shows the structure of the electromagnetic contactor which concerns on the 2nd modification of Embodiment 1 of this invention. Sectional drawing of the magnetic contactor which concerns on Embodiment 2 of this invention Circuit diagram including changeover switch and exciting coil shown in FIG.

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

Embodiment 1 FIG.
FIG. 1 is a first cross-sectional view of an electromagnetic contactor according to Embodiment 1 of the present invention. FIG. 1 shows an electromagnetic contactor 100 in an open state. Opening means pulling the movable contact away from the fixed contact. FIG. 2 is a second cross-sectional view of the electromagnetic contactor according to Embodiment 1 of the present invention. FIG. 2 shows the electromagnetic contactor 100 in a closed state. FIG. 3 is a first circuit diagram including the changeover switch and the exciting coil shown in FIG. FIG. 3 shows a state in which a current flows through the exciting coil 3 via the movable contact 11 b in the changeover switch 11. FIG. 4 is a second circuit diagram including the changeover switch and the excitation coil shown in FIG. FIG. 4 shows a state in which a current flows through the exciting coil 3 via the resistor 15 when the movable contact 11 b is separated from the fixed contact 11 c in the changeover switch 11.

The electromagnetic contactor 100 includes a housing 20, a fixed contact 9A, a fixed contact 9B, a movable contact 10, a movable iron core 2, a fixed iron core 1, a spring 5, a changeover switch 11, and a printed circuit board 17.

A partition plate 21 is provided inside the housing 20. Examples of the material of the housing 20 and the partition plate 21 include insulating resins such as nylon and phenol resin. A through hole 21 a is formed in the partition plate 21. A fixed contact 9A on the power source side is provided on the upper side surface 21b of the partition plate 21 on the left side of the through hole 21a. Examples of the material of the fixed contact 9A include conductors such as a copper alloy and an iron alloy. The stationary contact 9A is connected to a power supply side terminal (not shown), and the power supply side terminal is connected to, for example, an AC power supply.

A fixed contact 8A on the power source side is provided on the upper side of the fixed contact 9A. The material of the fixed contact 8A can be exemplified by a silver alloy. A movable contact 7A is provided above the fixed contact 8A so as to face the fixed contact 8A. A silver alloy can be illustrated as a material of the movable contact 7A. The movable contact 7 </ b> A is provided below the movable contact 10. The material of the movable contact 10 can be exemplified by the same material as that of the fixed contact 9A. The movable contact 10 is provided with a movable contact 7B in addition to the movable contact 7A. A silver alloy can be illustrated as a material of the movable contact 7B. The movable contact 7B is provided below the movable contact 10 so as to face the load-side fixed contact 8B. Examples of the material of the fixed contact 8B include a silver alloy. The fixed contact 8B is provided above the fixed contact 9B on the load side. The material of the fixed contact 9B can be exemplified by the same material as that of the fixed contact 9A. The stationary contact 9B is provided on the upper side surface 21b of the partition plate 21 on the right side of the through hole 21a. The fixed contact 9A is connected to, for example, a commercial power source. For example, a load driven by electric power supplied from a commercial power source is connected to the fixed contact 9B. Hereinafter, when the movable contact 7A and the movable contact 7B are shown without distinction, they are simply referred to as a movable contact. When the fixed contact 8A and the fixed contact 8B are shown without distinction, they are simply called fixed contacts.

The cross bar 12 is provided in the through hole 21a. The crossbar 12 is a columnar member that extends along the direction from the ceiling 30 to the bottom 34 of the housing 20. The cross bar 12 is manufactured using an insulating material similar to that of the housing 20. The cross bar 12 is fixed to the movable contact 10. One end of the cross bar 12 extends from the movable contact 10 toward the ceiling 30 of the housing. The other end of the cross bar 12 extends from the movable contact 10 toward the bottom 34 of the housing 20.

One end of the cross bar 12 is exposed to the outside of the housing 20. A spring pressing member 6 is provided at one end of the cross bar 12. The spring pressing member 6 is a plate-like member that extends in a direction orthogonal to the direction in which the crossbar 12 extends. The spring pressing member 6 is manufactured using a metal such as iron or SUS (Steel Use Stainless). One end of the spring 5 is in contact with the lower surface of the spring pressing member 6. The spring 5 is a push spring that pushes the movable iron core 2 in a direction away from the fixed iron core 1, and the spring load increases as it is compressed. The spring load is a force generated by the amount of deflection.

The spring 5 is provided in a recess 31 formed in the ceiling 30 of the housing. The recess 31 is a dent that protrudes from the ceiling 30 to the bottom 34 of the housing 20. A through hole 33 is formed in the bottom 32 of the recess 31. One end of the cross bar 12 is inserted into the through hole 33. The spring 5 is provided so as to surround the outer periphery of the cross bar 12 protruding from the through hole 33 to the outside of the housing 20. The other end of the spring 5 is in contact with the bottom 32 of the recess 31.

The other end of the crossbar 12 is provided with a crossbar 4 that is a first crossbar. The cross bar 4 is a member that extends in the left-right direction of the housing 20. The left-right direction of the housing 20 is equal to the direction orthogonal to the direction from the ceiling portion 30 to the bottom portion 34 of the housing 20. The cross bar 4 is manufactured using an insulating material similar to that of the housing 20. The cross bar 4 is disposed away from the movable contact 10 so as to face the lower surface 10a of the movable contact 10. A recess 4 a is formed on the lower side of the cross bar 4. The recess 4 a is a projecting recess from the bottom 34 of the housing 20 toward the ceiling 30. The movable iron core 2 is provided in the recess 4a. The movable iron core 2 is fixed to the cross bar 4. In the present embodiment, the recess 31 is formed in the housing, and the spring 5 is disposed in the recess 31, but the configuration in which the spring load of the spring 5 changes when the movable iron core 2 is attracted to the fixed iron core 1. The arrangement position of the spring 5 is not limited to the illustrated example. For example, the spring 5 may be provided inside the housing 20.

The fixed iron core 1 is an E core provided on the bottom 34 of the housing 20 so as to face the movable iron core 2. An excitation coil 3 is provided on the fixed iron core 1. The exciting coil 3 is a coil for generating a magnetic flux and generating an electromagnetic force in the fixed iron core 1 when a current flows. One end of the exciting coil 3 is connected to one end of the first wiring 51, and the other end of the first wiring 51 is connected to one end of the fixed contact 11 c of the changeover switch 11 and one end of the resistor 15. The changeover switch 11 is a normally closed mechanical switch. The resistor 15 is connected in parallel with the fixed contact 11c. The changeover switch 11 and the resistor 15 are provided on the printed circuit board 17. The printed circuit board 17 has a first substrate surface 17a on which a changeover switch is provided, and a second substrate surface 17b opposite to the first substrate surface 17a. The other end of the fixed contact 11 c of the changeover switch 11 and the other end of the resistor 15 are connected to one end of the second wiring 52, and the other end of the second wiring 52 is connected to the power supply 14. The power source 14 may be an AC power source or a DC power source.

The other end of the exciting coil 3 is connected to one end of the third wiring 53, and the other end of the third wiring 53 is connected to one end of the fixed contact 16 b of the operation switch 16. The operation switch 16 is a normally open switch. The other end of the fixed contact 16 b of the operation switch 16 is connected to one end of the fourth wiring 54, and the other end of the fourth wiring 54 is connected to the power supply 14. When the user operates the operation switch 16, the electromagnetic contactor 100 operates.

The cross bar 4 is provided with a cross bar 41 which is a second cross bar. The cross bar 41 is provided in a portion of the lower side surface 4b of the cross bar 4 other than the region where the movable iron core 2 is provided. The cross bar 41 is a columnar member. The cross bar 41 is manufactured using an insulating material similar to that of the housing 20. The cross bar 4 and the cross bar 41 may be manufactured by die-casting using an insulating material by die casting, or may be combined with each other after being manufactured individually.

A columnar member 11a is provided below the cross bar 41. The columnar member 11 a is provided so as to face the cross bar 41. The columnar member 11 a is provided at the movable contact 11 b of the changeover switch 11. The columnar member 11 a is a columnar member that extends from the movable contact 11 b of the changeover switch 11 toward the crossbar 41. The columnar member 11 a is manufactured using an insulating material similar to that of the housing 20.

The position adjusting member 13 is provided between the second substrate surface 17 b of the printed circuit board 17 and the bottom 34 of the housing 20. The position adjustment member 13 is a plate-like member formed in a plate shape using a material whose elastic modulus is smaller than the elastic modulus of the printed circuit board 17, for example, and covers the entire bottom surface of the printed circuit board 17 with the printed circuit board 17. It is provided between the bottom 34 of the housing. Examples of the material of the position adjusting member 13 include rubber and gel. Examples of rubber include chloroprene rubber, styrene butadiene rubber, and fluoro rubber. The gel is a hydrogel of water as a dispersion medium, an organogel whose dispersion medium is an organic solvent, or the like.

Since the position of the printed circuit board 17 is changed by changing the thickness T of the position adjusting member 13, the position of the changeover switch 11 provided on the upper side of the printed circuit board 17 is also changed. Thereby, the width | variety from the front-end | tip of the cross bar 41 to the front-end | tip of the columnar member 11a can be adjusted.

Note that each of the movable contact 10, the fixed contact 9A, and the fixed contact 9B is provided so as to correspond to the U phase, the V phase, and the W phase. Hereinafter, when the fixed contact 9A and the fixed contact 9B are shown without distinction, they are simply referred to as fixed contacts.

Next, the operation of the electromagnetic contactor 100 according to Embodiment 1 will be described. By operating the operation switch 16, the movable contact 16a of the operation switch 16 is connected to the fixed contact 16b. As a result, the first current I1 flows from the power source 14 to the exciting coil 3 via the movable contact 11b of the changeover switch 11, and electromagnetic force is generated in the fixed iron core 1 to move against the spring load of the spring 5. The iron core 2 is attracted to the fixed iron core 1. When the movable iron core 2 is attracted to the fixed iron core 1, the cross bar 41 is in contact with the columnar member 11a, and the movable contact 11b of the changeover switch 11 connected to the columnar member 11a is separated from the fixed contact 11c.

When the movable contact 11b moves away from the fixed contact 11c, the current supplied from the power source 14 flows to the excitation coil 3 via the resistor 15. At this time, the value of the second current I2 flowing to the excitation coil 3 is the movable contact. It becomes smaller than the value of the 1st electric current I1 which flows into the exciting coil 3 via 11b. The value of the second current I2 is set to a value that can maintain the closed state. While the second current I2 continues to flow through the exciting coil 3, the closed state shown in FIG. 2 is maintained. When the power source 14 is a DC power source, a coil may be used as a current limiting element instead of the resistor 15. When the power source is an AC power source, a capacitor may be used as a current limiting element instead of the resistor 15. Thus, even when a coil or a capacitor is used instead of the resistor 15, the wiring impedance between the power source 14 and the exciting coil 3 can be increased, and the value of the second current I2 is set to the value of the first current I1. It can be made lower than the value.

When changing from the closed state to the open state, the movable contact 16a of the operation switch 16 is separated from the fixed contact 16b by the operation of the operation switch 16. Thereby, the 2nd electric current I2 stops flowing into the exciting coil 3, and the electromagnetic force of the fixed iron core 1 falls. When the electromagnetic force of the fixed iron core 1 is lower than the spring load stored in the spring 5, the closed state cannot be maintained, and the movable iron core 2 together with the crossbar 12 moves toward the ceiling portion 30 of the housing due to the spring load. Moving. The movable contact 11b of the changeover switch 11 is provided with a return spring (not shown), and the movable contact 11b is maintained in contact with the fixed contact 11c by the restoring force of the return spring.

Next, the relationship between the current flowing through the exciting coil 3, the displacement of the movable core 2, the spring load of the spring 5, and the electromagnetic force of the fixed core 1 during the closing operation will be described.

FIG. 5 is a diagram showing the relationship between the current flowing through the exciting coil 3 shown in FIGS. 3 and 4 and the displacement of the movable iron core. The current flowing through the exciting coil 3 is shown on the upper side of FIG. 5, the vertical axis represents the value of the current flowing through the exciting coil 3, and the horizontal axis represents time. On the left side of the dotted line A is a region where a current for changing the stationary contact and the movable contact 10 from the open state to the closed state flows in the exciting coil 3. In FIG. 5 and FIG. 6, the region is described as a “closed current region”. On the right side of the dotted line A is a region where a current for holding the closed state flows through the exciting coil 3 after changing from the open state to the closed state, and in FIG. 5 and FIG. It is noted as “current region”. The lower side of FIG. 5 shows the displacement of the movable iron core 2, the vertical axis represents the displacement of the movable iron core 2, and the horizontal axis represents time.

For example, when the movable contact 16a of the operation switch 16 comes into contact with the fixed contact 16b at time t0, the value of the current flowing through the exciting coil 3 rises, and the movable iron core 2 is fixed at time t1 after a predetermined time has elapsed from time t0. Start moving toward iron core 1. Thereafter, when the movable iron core 2 approaches the fixed iron core 1 and the movable contact 11b comes into contact with the fixed contact 11c at the time t2, and the movable contact 11b of the changeover switch 11 moves away from the fixed contact 11c, it flows into the exciting coil 3. The current value drops rapidly. In FIG. 5, the timing at time t2 is equal to the position of dotted line A.

After time t2, the movable iron core 2 continues to move toward the fixed iron core 1, and the movable iron core 2 contacts the fixed iron core 1 at the timing of time t3. As a result, the movement of the movable iron core 2 is stopped and the closed state is maintained. In FIG. 5, the timing of contact of the movable contact 11b with the fixed contact 11c is equal to the timing of moving the movable contact 11b of the changeover switch 11 away from the fixed contact 11c. However, these timings may be shifted.

FIG. 6 is a diagram showing the relationship between the spring load of the spring shown in FIGS. 1 and 2, the electromagnetic force generated in the fixed iron core, and the displacement of the movable iron core. The vertical axis in FIG. 6 represents the spring load and the electromagnetic force, and the horizontal axis represents the displacement of the movable iron core 2. Times t1 to t3 shown in FIG. 6 are equal to the times shown in FIG. From time t1 to time t2, the electromagnetic force is larger than the spring load of a return spring (not shown). The return spring is, for example, a spring provided between the cross bar 4 and the bottom portion 34. By providing the return spring, for example, when the casing 20 vibrates, the cross bar 4 is fixed at a specific position in order to prevent the movable contact 10 in the open state from coming into contact with the fixed contact. It is a spring. When the movable contact 11b of the changeover switch 11 is separated from the fixed contact 11c at the time t2, the current flowing through the exciting coil 3 is reduced, so that the electromagnetic force is lower than the spring load of the return spring. However, since the movable iron core 2 and the crossbar 4 have inertial force, the movement of the movable iron core 2 is continued. In addition, since the gap between the fixed iron core 1 and the movable iron core 2 is very small at the time t2, even if the current flowing through the exciting coil 3 is reduced, the fixed iron core 1 and the movable iron core 2 The electromagnetic force between them is higher than the spring load of the return spring. After completion of the closing, current continues to flow to the exciting coil 3 via the resistor 15, so that the electromagnetic force increases. Then, at the timing of time t3, the electromagnetic force has a larger value than the contact pressure spring load that is the spring load of the spring 5. As a result, the closed state is maintained.

Here, immediately after the movable contact 11b of the changeover switch 11 moves away from the fixed contact 11c at the time of closing, the movable iron core 2 moves by inertia, but the timing at which the movable contact 11b of the changeover switch 11 moves away from the fixed contact 11c is The earlier the time t2, the earlier the timing at which the electromagnetic force decreases, and the inertial force of the movable iron core 2 becomes smaller. Therefore, there is a possibility that it cannot be surely closed.

On the other hand, as the timing at which the movable contact 11b of the changeover switch 11 moves away from the fixed contact 11c is later than the time t2, the timing at which the electromagnetic force decreases is delayed, although the timing can be surely closed. The energy with which the movable iron core 2 collides with the fixed iron core 1 is increased, and the rebound when the movable iron core 2 collides with the fixed iron core 1 is increased. As a result, chattering occurs between the movable contact and the fixed contact, an arc is generated between the movable contact and the fixed contact, and the movable contact and the fixed contact are consumed. Further, the collision energy when the movable iron core 2 collides with the fixed iron core 1 is transmitted in the order of the bottom 34 of the housing and the printed circuit board 17, and further transmitted to components such as the changeover switch 11 and the rectifier circuit on the printed circuit board 17. Therefore, a structure for absorbing the collision energy is added so that the components on the printed circuit board 17 do not break down, or the electromagnetic contactor 100 is made a strong structure so that the collision energy is difficult to propagate to the printed circuit board 17. Measures such as increasing rigidity are required. In consideration of the number of mechanical operations of the magnetic contactor 100, it is desirable to reduce the collision energy generated during the closing operation. In addition, adding a mechanism for suppressing chattering in order to suppress wear of the movable contact and the fixed contact, or making the electromagnetic contactor 100 a strong structure is accompanied by an increase in manufacturing cost of the electromagnetic contactor 100.

Further, when the magnetic contactor 100 is mass-produced, the electromagnetic force generated in the fixed iron core 1 due to manufacturing tolerances of the parts constituting the magnetic contactor 100, variations in assembly of the parts, etc. In addition, the electromagnetic force generated between the fixed iron core 1 and the movable iron core 2 changes. Therefore, in the fixed iron core 1 having a small electromagnetic force, the electromagnetic force at the time of closing becomes small, and in the fixed iron core 1 having a large electromagnetic force, the electromagnetic force at the time of closing becomes large. Moreover, when the magnetic contactor 100 is mass-produced, the spring load of the spring may vary. In this way, individual differences occur in the mass-produced electromagnetic contactors 100, so that the timing at which the movable contact 11b of the changeover switch 11 is separated from the fixed contact 11c is taken into consideration in consideration of the electromagnetic force and the spring load at the time of closing. It needs to be adjusted.

In the electromagnetic contactor 100 according to the first embodiment, the position adjusting member 13 is used, and even if individual differences occur in the mass-produced electromagnetic contactor 100 by adjusting the plate thickness of the position adjusting member 13, it is movable. It is possible to reliably close the core while suppressing an increase in energy that the iron core 2 collides with the fixed iron core 1.

FIG. 7 is a diagram showing a configuration example when the thickness of the position adjusting member shown in FIG. 1 is increased. For example, when the electromagnetic force generated in the fixed iron core 1 becomes smaller than the electromagnetic force shown in FIG. 6, the timing at which the movable contact 11b of the changeover switch 11 moves away from the fixed contact 11c may be later than the time t2. . In this case, by increasing the thickness T of the position adjusting member 13 as shown in FIG. 7, the position of the printed circuit board 17 in the vertical direction of the housing is increased. As a result, the position of the tip of the columnar member 11 a of the changeover switch 11 is close to the tip of the crossbar 41. Therefore, the width from the tip of the cross bar 41 to the tip of the columnar member 11a is narrowed, and the timing at which the movable contact 11b is separated from the fixed contact 11c can be advanced.

FIG. 8 is a diagram showing a configuration example when the thickness of the position adjusting member shown in FIG. 1 is reduced. For example, when the electromagnetic force generated in the fixed iron core 1 is larger than the electromagnetic force shown in FIG. 6, the timing at which the movable contact 11b of the changeover switch 11 is separated from the fixed contact 11c may be earlier than time t2. . In this case, by reducing the thickness T of the position adjusting member 13 as shown in FIG. 8, the position of the printed circuit board 17 in the vertical direction of the housing is lowered. Thereby, the position of the tip end of the columnar member 11 a of the changeover switch 11 is far from the tip end of the cross bar 41. Therefore, the width from the tip of the cross bar 41 to the tip of the columnar member 11a is widened, and the timing at which the movable contact 11b is separated from the fixed contact 11c can be delayed.

Thereby, for example, the timing at which the movable contact 11b is separated from the fixed contact 11c can be set before the timing at which the movable core 2 contacts the fixed core 1. Furthermore, the time from the timing when the movable contact 11b moves away from the fixed contact 11c to the timing when the movable iron core 2 contacts the fixed iron core 1 can be set to an arbitrary value. Therefore, immediately before the movable iron core 2 comes into contact with the fixed iron core 1, the columnar member 11a extends from the tip of the cross bar 41 so that the movable contact 11b of the changeover switch 11 is separated from the fixed contact 11c using the inertial force of the movable iron core 2. The width to the tip of can be adjusted. Thereby, it is possible to reliably close the electrode while reducing the collision energy at the time of closing. The position adjustment member 13 may be any member provided between the printed circuit board 17 and the bottom 34 of the housing and capable of changing the position of the printed circuit board 17. The side surface of the substrate 17 is not limited to a flat plate-like member, and a slight unevenness may be formed on the surface of the position adjustment member 13 on the printed circuit board 17 side or the surface opposite to the surface. As described above, when slight irregularities are formed on the surface of the position adjusting member 13 on the printed circuit board 17 side or on the surface opposite to the surface, the surface on the printed circuit board 17 side or on the opposite side of the surface. Compared with the case where the surface is processed to be flat, the process of flattening the surface of the position adjusting member 13 is not necessary, and the manufacturing cost of the position adjusting member 13 can be reduced. Further, when the position adjusting member 13 in which the surface on the printed circuit board 17 side or the surface opposite to the surface is processed flat is used, the surface on the printed circuit board 17 side or the surface opposite to the surface is slightly Since the position of the printed circuit board 17 can be accurately adjusted as compared with the case where unevenness is formed, the timing at which the movable contact 11b of the changeover switch 11 is separated from the fixed contact 11c can be accurately adjusted. Further, when the position adjusting member 13 in which the surface on the printed circuit board 17 side or the surface opposite to the surface is processed flat is used, the surface on the printed circuit board 17 side or the surface opposite to the surface is slightly Compared with the case where unevenness is formed, the contact area of the position adjusting member 13 to the printed circuit board 17 increases, and the printed circuit board 17 can be reliably fixed to the position adjusting member 13.

So far, the configuration example has been described in which the timing at which the movable contact 11b of the changeover switch 11 is separated from the fixed contact 11c is changed by changing the thickness of the position adjusting member 13 provided on the lower side of the printed circuit board 17. Below, the structural example which changes the timing which the movable contact 11b of the changeover switch 11 leaves | separates from the fixed contact 11c by changing the length of the crossbar 41 is demonstrated.

The excitation coil 3 has a different voltage applied to the excitation coil 3 from, for example, 24V to 500V, in addition to the one to which an AC voltage or a DC voltage is applied. Therefore, it is necessary to change the specifications of the exciting coil 3 used in the electromagnetic contactor 100 according to the specifications of the power supply, load, etc. connected to the electromagnetic contactor 100. In all coils having different specifications, it is necessary to satisfy the conditions such as the closing time of the magnetic contactor 100, chattering characteristics, and the minimum operating voltage. However, if these conditions are satisfied in all coils having different specifications, a long design time is required, and the manufacturing cost of the magnetic contactor 100 increases.

FIG. 9 is a diagram showing a configuration of the electromagnetic contactor according to the first modification of the first embodiment of the present invention. In the cross bar 4A shown in FIG. 9, a screw hole 4c is formed in the lower surface 4b of the cross bar 4A. The male screw portion 41a of the cross bar 41A is inserted into the screw hole 4c. A pressing member 41b that presses the columnar member 11a is provided below the male screw portion 41a. According to the cross bar 41A, for example, the width from the front end of the pressing member 41b to the front end of the columnar member 11a is set to an arbitrary value by changing the screwing amount into the cross bar 4A in consideration of the characteristic variation for each coil. Can be set. As described above, the cross bar 41A shown in FIG. 9 has a screw structure that is inserted into the screw hole 4c formed in the lower side surface 4b of the cross bar 4A.

For example, the position of the cross bar 41A is adjusted so that the timing at which the movable contact 11b moves away from the fixed contact 11c is delayed as the magnetomotive force required for the exciting coil 3 having a specific rated value increases. On the contrary, the position of the cross bar 41A is adjusted so that the timing at which the movable contact 11b moves away from the fixed contact 11c is earlier as the magnetomotive force required for the exciting coil 3 having a specific rated value is smaller. . Further, according to the result of observing the closing time, chattering characteristics, minimum operating voltage, etc. of the magnetic contactor 100, the crossbar is set so that the timing at which the movable contact 11b of the changeover switch 11 moves away from the fixed contact 11c becomes an optimum value. The position of 41A can also be adjusted.

FIG. 10 is a diagram showing a configuration of an electromagnetic contactor according to a second modification of the first embodiment of the present invention. In the cross bar 4B shown in FIG. 10, a screw hole 4c1 that is a through hole penetrating from the lower side surface 4b of the cross bar 4B to the upper side surface 4d is formed. The male screw portion 41a1 of the cross bar 41B is inserted into the screw hole 4c1. The tip of the male screw portion 41a1 protrudes from the lower surface 4b of the cross bar 4B. The tip of the male screw portion 41a1 functions as a pressing member that faces the columnar member 11a and presses the columnar member 11a. The male screw portion 41a1 is provided with an adjusting mechanism 41c. The screwing amount of the male screw portion 41a1 to the cross bar 4B changes according to the rotation amount of the adjusting mechanism 41c. Thereby, the width | variety from the front-end | tip of the cross bar 41B to the front-end | tip of the columnar member 11a can be set to arbitrary values.

As described above, according to the electromagnetic contactor 100 according to the first embodiment, the timing at which the movable contact 11b is separated from the fixed contact 11c is changed by the plate-like position adjusting member 13 provided on the lower side of the printed circuit board 17. Therefore, unlike the prior art of Patent Document 1, stress does not concentrate on the contact portion between the printed circuit board 17 and the screw, and a decrease in durability of the printed circuit board 17 can be suppressed.

Moreover, in the prior art of patent document 1, after the timing which the movable contact 11b leaves | separates from the fixed contact 11c is adjusted, the changeover switch 11 is fixed to the printed circuit board 17 with the resin casting agent, but the changeover switch 11 is fixed. For this reason, there is a possibility that a gap is generated at the boundary between the outer peripheral surface of the screw and the casting agent, and the change-over switch 11 is not sufficiently fixed to the printed circuit board 17. In the electromagnetic contactor 100 according to the first embodiment, since the plate-like position adjusting member 13 is used instead of the screw-type position adjusting member, the change-over switch 11 can be securely fixed to the printed circuit board 17. it can.

Further, since the position adjusting member 13 is made of a material whose elastic modulus is smaller than that of the printed circuit board 17, vibration when the movable iron core 2 collides with the fixed iron core 1 is caused from the housing 20 to the position adjusting member. 13 is absorbed by the position adjustment member 13. Therefore, vibration is hardly transmitted to the printed circuit board 17 and components on the printed circuit board 17 are less likely to fail.

Embodiment 2. FIG.
FIG. 11 is a cross-sectional view of an electromagnetic contactor according to Embodiment 2 of the present invention. FIG. 12 is a circuit diagram including the changeover switch and the exciting coil shown in FIG. The electromagnetic contactor 100 according to the second embodiment includes a changeover switch 11A, a fixed contact 11c1, and a switch 11d connected to the fixed contact 11c1 and interlocking with the movable contact 11b1 instead of the changeover switch 11 shown in FIG. . The fixed contact 11c1 is provided, for example, on an insulating support member 22 provided inside the housing.

The changeover switch 11A includes a movable contact 11b1 provided in the changeover switch 11A so as to be rotatable about the pin 60. The movable contact 11b1 and the fixed contact 11c1 are normally closed mechanical contacts. When the power source 19 is connected to the movable contact 11b1 and the movable contact 11b1 is connected to the fixed contact 11c1, a current flows through the switch 11d, and the current supplied from the power source 14 is supplied to the exciting coil 3 via the switch 11d. Flowing.

During the closing operation, the columnar member 11a moves toward the printed circuit board 17, and the movable contact 11b1 is pushed by the columnar member 11a. As a result, the movable contact 11b1 rotates with the pin 60 as a fulcrum, and the tip thereof is separated from the fixed contact 11c1. When the movable contact 11b1 moves away from the fixed contact 11c1, no current flows through the switch 11d, and the current supplied from the power source 14 flows through the resistor 15 through the exciting coil 3. The switch 11d may be a semiconductor switch or a mechanical switch as long as it is interlocked with the movable contact 11b1.

When changing from the closed state to the open state, the operation switch 16 moves the movable contact 16a of the operation switch away from the fixed contact 16b. Thereby, the 2nd electric current I2 stops flowing into the exciting coil 3, and the electromagnetic force of the fixed iron core 1 falls. When the electromagnetic force of the fixed core 1 is lower than the spring load stored in the spring 5, the closed state cannot be maintained, and the movable core 2 together with the crossbar 12 moves toward the ceiling portion 30 of the housing 20 due to the spring load. Move. Further, the movable contact 11b1 is separated from the fixed contact 11c1 by the restoring force of a return spring (not shown) provided at the movable contact 11b1.

According to the electromagnetic contactor 100 according to the second embodiment, the position of the changeover switch 11A can be changed by changing the thickness of the position adjusting member 13 as in the first embodiment. Similar effects can be obtained. Furthermore, according to the electromagnetic contactor 100 according to the second embodiment, since the movable contact 11b1 and the fixed contact 11c1 of the changeover switch 11A are separated, the degree of freedom of the arrangement position of the movable contact 11b1 and the fixed contact 11c1 is increased. improves. For example, the timing at which the movable contact 11b1 is separated from the fixed contact 11c1 can be adjusted by adjusting the mounting position of the pin 60 in the casing constituting the changeover switch 11A. Therefore, even when individual differences occur in the mass-produced electromagnetic contactors 100, it is possible to absorb variations in the closing operation caused by the individual differences only by changing the configuration of the changeover switch 11A.

The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 fixed iron core, 2 movable iron core, 3 excitation coil, 4, 4A, 4B, 11a, 12, 41, 41A, 41B crossbar, 4a, 31 recess, 4b, 10a lower side surface, 4c, 4c1 screw hole, 4d, 21b Upper side, 5 spring, 6 spring holding member, 7A, 7B, 11b, 11b1, 16a movable contact, 8A, 8B, 11c, 11c1, 16b fixed contact, 9A, 9B fixed contact, 10 movable contact, 11, 11A Changeover switch, 11d switch, 13 position adjustment member, 14, 19 power supply, 15 resistor, 16 operation switch, 17 printed circuit board, 17a first substrate surface, 17b second substrate surface, 20 housing, 21 partition plate, 21a, 33 through hole, 22 support member, 30 ceiling, 32 bottom, 34 bottom, 41a, 41a1 male Flip portion, 41b pressing member, 41c adjustment mechanism, 51 first wiring, 52 second wiring, 53 a third wiring, 54 a fourth wiring, 60-pin, 100 electromagnetic contactor.

Claims

A housing,
A stationary contact provided inside the housing;
A movable contact facing the fixed contact;
A first crossbar interlocked with the movable contact;
A movable iron core provided in the first crossbar;
A second crossbar provided on the first crossbar;
A fixed iron core facing the movable iron core,
A spring that pushes the movable iron core away from the fixed iron core;
When the first current flows, an electromagnetic force is generated in the fixed iron core so that the movable iron core is attracted to the fixed iron core against the spring load of the spring to bring the movable contact into contact with the fixed contact. When a second current lower than the first current flows, an exciting coil that generates an electromagnetic force in the fixed iron core so as to maintain a state in which the movable contact is in contact with the fixed contact;
A columnar member facing the second crossbar, and the fixed contact so as to contact the fixed contact so that the first current flows in conjunction with the columnar member or to flow the second current in conjunction with the columnar member A mechanical changeover switch having a movable contact away from
A printed circuit board having a first substrate surface on which the changeover switch is provided, and a second substrate surface opposite to the first substrate surface side;
A position adjusting member provided between the second substrate surface and the housing, for changing a position of the movable contact of the changeover switch;
An electromagnetic contactor comprising:
The electromagnetic contactor according to claim 1, wherein an elastic modulus of the position adjusting member is smaller than an elastic modulus of the printed circuit board.
The electromagnetic contactor according to claim 1, wherein the second cross bar has a screw structure that is inserted into a screw hole formed on a lower surface of the first cross bar.
The second crossbar has a screw structure inserted into a through-hole penetrating from the upper side surface to the lower side surface of the first crossbar,
2. The electromagnetic contactor according to claim 1, wherein a tip end of the second cross bar protruding from a lower surface of the first cross bar faces the columnar member.
A switch connected to the fixed contact and interlocked with the movable contact;
When the movable contact is in contact with the fixed contact, the first current flows through the excitation coil via the switch,
The said 2nd electric current flows into the said excitation coil through the current limiting element connected in parallel with the said fixed contact when the said movable contact is separated from the said fixed contact. Electromagnetic contactor.