Electromagnetic contactor, method for adjusting contact gap of the same, method for calculating amount of stroke of the same, and method for calculating amount of wipe

Abstract

To provide an electromagnetic contactor capable of setting a gap between contacts to a proper value by simple assembling work even if there are some variations in dimension of a component, and reducing the manufacturing cost.SOLUTION: An electromagnetic contactor includes: a fixed contact 3 having a fixed contact point 9; an electromagnet unit 5 to which a movable contact 4 having a movable contact point 10 coming into contact with and separating from the fixed contact point is connected via a contact support 11; and a sealed container 2 for housing the fixed contact, the movable contact, and the electromagnet unit in the same space. With the electromagnet unit 5, unit-side connecting sections 25a, 25b connected from a moving direction of the movable contact are provided in container-side connecting sections 33, 36 provided in the sealed container. Between the container-side connecting section and the unit-side connecting section, flat plate-shaped spacers 34, 37 for adjusting an inter-contact gap G between the fixed contact and the movable contact are sandwiched and arranged.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electromagnetic contactor capable of adjusting a contact gap, a contact gap adjusting method for an electromagnetic contactor, a stroke amount calculating method, and a wipe amount calculating method for an electromagnetic contactor. [Background technology]

[0002] For example, the electromagnetic contactor described in Patent Document 1 includes an electromagnet unit in which a fixed contactor having a fixed contact and a movable contactor having a movable contact that moves toward and away from the fixed contact are connected via a contact support, and a sealed container that houses the fixed contactor, the movable contactor, and the electromagnet unit in the same space. This electromagnetic contactor improves interruption performance by extending an arc generated between the fixed contactor and the movable contact to a large arc-extinguishing space in the sealed container.

[0003] In the electromagnetic contactor, various values ​​are set, such as the contact gap between the fixed contact and the movable contact, the stroke amount, and the wipe amount of the contact spring provided on the contact support. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-81586 A Summary of the Invention [Problem to be solved by the invention]

[0005] In order to improve the interruption performance and vibration and shock resistance of electromagnetic contactors, the work of adjusting the gap between contacts to an appropriate value has traditionally been a time-consuming task that required forming parts with high dimensional accuracy. In addition, the work of setting the stroke amount and the wipe amount also took a lot of time. This resulted in problems in terms of the manufacturing costs of electromagnetic contactors.

[0006] Therefore, the present invention aims to provide an electromagnetic contactor and a method for adjusting the contact gap of an electromagnetic contactor that can set the contact gap to an appropriate value through simple assembly work even if there is some variation in the dimensions of the component parts, thereby reducing manufacturing costs.

[0007] Another object of the present invention is to provide a stroke amount calculation method and a wipe amount calculation method for an electromagnetic contactor, which enable the stroke amount and wipe amount to be set by a simple operation. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, an electromagnetic contactor according to one embodiment of the present invention comprises an electromagnet unit in which a fixed contactor having a fixed contact and a movable contactor having a movable contact that moves towards and away from the fixed contactor are connected via a contact support, and an airtight container that stores the fixed contactor, the movable contactor and the electromagnet unit in the same space, and the electromagnet unit is provided with a unit side connecting portion that connects to a container side connecting portion provided on the airtight container from the direction of movement of the movable contactor, and a flat-shaped spacer that adjusts the contact gap between the fixed contact and the movable contact is sandwiched and arranged between the container side connecting portion and the unit side connecting portion.

[0009] A method for adjusting a contact gap of an electromagnetic contactor includes an electromagnetic contactor including a fixed contact having a fixed contact, an electromagnet unit in which a movable contact having a movable contact that moves toward and away from the fixed contact is connected via a contact support, and an airtight container that houses the fixed contact, the movable contact and the electromagnet unit in the same space, the electromagnet unit being provided with a unit side connecting part that connects to a container side connecting part provided in the airtight container from the moving direction of the movable contactor, and a flat spacer that adjusts the contact gap is disposed between the container side connecting part and the unit side connecting part. A method for adjusting a contact gap between a fixed contact and a movable contact, comprising the steps of: measuring a first distance L1 along a moving direction of a movable contact between a first surface of a unit-side connecting portion that abuts against a spacer of the electromagnet unit when the electromagnet unit is in a non-excited state and the movable contact, before connecting the electromagnet unit to a sealed container; measuring a second distance L2 along a moving direction of the movable contact between a second surface of a container-side connecting portion that abuts against the spacer of the container-side connecting portion and the fixed contact; and setting a thickness T of the spacer by the following formula (a), where a target value of the contact gap is Gt and a thickness of the spacer is T: T = Gt -(L2 - L1) ...... (a) The contact gap between the fixed contact and the movable contact is adjusted by connecting the container side connecting part and the unit side connecting part with a spacer having a thickness T sandwiched therebetween.

[0010] In addition, the method for calculating the stroke amount of an electromagnetic contactor is a method for calculating the stroke amount of an electromagnetic contactor using the first distance L1 measured by the above-mentioned method for adjusting the contact gap of an electromagnetic contactor, in which a third distance L3 along the movement direction of the movable contactor between the first surface that abuts against the spacer of the unit side connecting part when the electromagnet unit is in an excited state and the movable contact is measured before connecting the electromagnet unit to the sealed container, and the stroke amount S is calculated using the following formula (b). S = L3 - L1 ……… (b)

[0011] Furthermore, the method for calculating the wipe amount of the electromagnetic contactor uses the target value Gt of the contact gap used in the above-mentioned method for adjusting the contact gap of the electromagnetic contactor and the stroke amount S calculated in the above-mentioned method for calculating the stroke amount of the electromagnetic contactor to calculate the wipe amount W by the following formula (c): W = S - W ... (c) Effect of the Invention

[0012] According to the electromagnetic contactor and the method for adjusting the contact gap of the electromagnetic contactor of the present invention, the contact gap can be set to an appropriate value simply by assembling the components through normal operations, without having to increase the dimensional accuracy of the components, thereby enabling a reduction in manufacturing costs.

[0013] Furthermore, according to the stroke amount calculation method and wipe amount calculation method for an electromagnetic contactor of the present invention, the stroke amount and wipe amount can be set by a simple operation. [Brief description of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view showing an electromagnetic contactor according to the present invention. [Diagram 2] 1 is an exploded perspective view showing a state in which a unit-side connecting portion of an electromagnet unit is connected to a container-side connecting portion provided on a capsule case of an electromagnetic contactor according to the present invention, with a spacer sandwiched therebetween. FIG. [Diagram 3] A diagram showing measuring a first distance of an electromagnet unit and a second distance of a capsule case to select a spacer of a predetermined thickness. [Figure 4] 11A and 11B are diagrams showing an electromagnet unit in a non-excited state and an excited state for measuring the stroke amount of an electromagnetic contactor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are given the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc., differ from the actual ones. Therefore, the specific thickness and dimensions should be determined with reference to the following description. In addition, it goes without saying that the drawings include parts with different dimensional relationships and ratios.

[0016] In addition, the embodiments shown below are merely examples of devices and methods for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components to those described below. The technical idea of ​​the present invention can be modified in various ways within the technical scope defined by the claims.

[0017] In addition, terms indicating directions such as "upper", "lower", "left", and "right" used in the following description are used with reference to the directions in the accompanying drawings.

[0018] FIG. 1 shows an electromagnetic contactor 1 according to a first embodiment of the present invention.

[0019] The electromagnetic contactor 1 is a sealed high-voltage contactor that opens and closes the main circuit using electromagnetic force, and is equipped with a sealed container 2 made of electrically insulating resin, and a pair of fixed contactors 3, a movable contactor 4, and an electromagnet unit 5 housed in the sealed container 2, and the electromagnet unit 5 drives the movable contactor 4 in a direction to move it toward and away from the pair of fixed contactors 3.

[0020] The sealed container 2 is composed of a capsule case 6 and a capsule cover 7.

[0021] The capsule case 6 is a rectangular cylindrical member whose lower end (one end) is open and whose upper end (the other end) is closed in Fig. 1. The capsule cover 7 is a lid-shaped member. The lower end of the capsule case 6 and the capsule cover 7 are fitted together at their open ends and fastened together by tapping screws (not shown).

[0022] The pair of fixed contacts 3 are electrodes made of conductive metal and formed into a roughly cylindrical shape, and are integrated by insert molding in a state where they penetrate through the wall of the capsule case 6. Screw holes 8 are formed in the upper parts of the pair of fixed contacts 3 and are exposed to the outside of the capsule case 6. Primary and secondary terminal screws (not shown) of the main circuit are fitted into these screw holes 8. The lower sides of the pair of fixed contacts 3 protrude into the inside of the capsule case 6, and fixed contacts 9 are formed at their lower parts.

[0023] 1, is formed in a flat plate shape extending in the left-right direction, and is disposed opposite the pair of fixed contacts 3. A pair of movable contacts 10 that come into contact with and separate from the fixed contacts 9 of the pair of fixed contacts 3 are formed on both ends of the movable contact 4 in the left-right direction.

[0024] The movable contactor 4 is connected to the electromagnet unit 5 via a contact support 11. The contact support 11 includes a base 12 connected to the electromagnet unit 5, a pressing member 13 for holding the movable contactor 4, and a contact spring 14 for setting a wipe amount (described later) for applying contact pressure to the movable contactor 4. The contact spring 14 is a compression coil spring, and is interposed between the base 12 and the movable contactor 4, biasing the movable contactor 4 upward in Fig. 1. In this way, the contact spring 14 elastically supports the movable contactor 4, thereby keeping the contact pressure between the movable contact 10 and the fixed contact 9 constant.

[0025] The electromagnet unit 5 includes a spool 20, a sliding collar 21, a movable plunger 22, an armature 23, a pair of outer yokes 24, a pair of bottom yokes 25a, 25b, a plunger ring 26, a back spring 27, a permanent magnet 28, and an auxiliary yoke 29.

[0026] The spool 20 is a winding frame made of an electrically insulating resin, and a coil 31 is wound around a cylindrical winding shaft 30 that extends in the vertical direction.

[0027] The sliding collar 21 is formed into a cylindrical shape from an electrically insulating resin, and is inserted into and fitted onto the inside of the winding shaft 30 from below in the vertical direction.

[0028] The movable plunger 22 is formed as a movable core in a cylindrical shape extending in the vertical direction, and is fitted inside the sliding collar 21 to guide its axial movement. The upper side of the movable plunger 53 in the vertical direction is connected to the base 12 of the contact support 11 via the connecting part 32. The armature 23 is a disk-shaped yoke, and is fixed to the lower end of the movable plunger 22.

[0029] The pair of outer yokes 24 are plate-shaped yokes, and are fixed to the left and right sides of the winding shaft 30. The pair of bottom yokes 25a, 25b are fixed to the lower parts of the pair of outer yokes 24, extending to the left and right sides on the same extension line.

[0030] The plunger ring 26 is a cylindrical yoke that extends in the vertical direction, is inserted into and fits into the inside of the winding shaft 30 from the upper side in the vertical direction, and is fixed to the upper pieces in the vertical direction of the pair of outer yokes 24. The inner diameter of the plunger ring 26 is larger than the outer diameter of the movable plunger 22 and is set so as to maintain a predetermined clearance with respect to the movable plunger 22.

[0031] The back spring 27 is a compression coil spring that is inserted through the movable plunger 22 while being sandwiched between the armature 23 and the plunger ring 26 , and biases the movable plunger 22 downward in the up-down direction relative to the spool 20 .

[0032] The permanent magnet 28 is a rectangular flat plate with a round hole formed therein, and is disposed so as to contact the lower parts of the pair of bottom yokes 25a, 25b and surround the armature 23. The auxiliary yoke 29 is a flat yoke, and is attached to the lower part of the permanent magnet 28. The unit side connecting portion of the present invention corresponds to the pair of bottom yokes 25a, 25b.

[0033] As shown in the enlarged portion of the essential part designated by symbol 1A in Figure 1, the electromagnet unit 5, to which the movable contactor 4 is connected via the contact support 11, abuts against a first case side mounting surface 33 formed on the periphery of the opening at the bottom of the capsule case 6 with a first spacer 34 sandwiched between them, and a fixing screw 35 passing through one of the bottom yokes 25a is screwed into the capsule case 6.

[0034] 2, a second case side mounting surface 36 is formed on the periphery of the opening of the capsule case 6 at a position that is linearly symmetrical to the first case side mounting surface 33 with respect to the central axis of the capsule case 6. The other bottom yoke 25b of the electromagnet unit 5 abuts against this second case side mounting surface 36 with a second spacer 37 sandwiched therebetween, and a fixing screw 35 that penetrates the other bottom yoke 25b is screwed into the capsule case 6. Note that the first surface and container side connecting portion of the present invention correspond to the first case side mounting surface 33 and the second case side mounting surface 36.

[0035] A pair of bottom yokes 25a, 25b abut against a first case side mounting surface 33 and a second case side mounting surface 36 provided on the opening periphery of the capsule case 6 via a first spacer 34 and a second spacer 37, and a fixing screw 35 that passes through these is screwed into the capsule case 6, thereby assembling the electromagnet unit 5 to the capsule case 6.

[0036] 2, positioning protrusions 33a, 36a are formed on the first case side mounting surface 33 and the second case side mounting surface 36, and positioning holes 34a, 37a are formed on the first spacer 34 and the second spacer 37. When the first spacer 34 and the second spacer 37 are disposed on the first case side mounting surface 33 and the second case side mounting surface 36, the positioning of the first spacer 34 and the second spacer 37 is performed by fitting the positioning protrusions 33a, 36a into the positioning holes 34a, 37a.

[0037] In the above-mentioned electromagnetic contactor 1, in a non-excited state where no current is passed through the coil 31 of the electromagnet unit 5, the movable plunger 22 is displaced downward by the magnetic force of the permanent magnet 28 and the repulsive force of the back spring 27, and the armature 23 is attracted to the auxiliary yoke 29. At this time, the contact support 11 is also displaced downward, so that the movable contact 10 is separated from the pair of fixed contacts 9, and the contact is opened.

[0038] On the other hand, in an excited state by energizing the coil 31 of the electromagnet unit 5, the armature 23 is attracted to the bottom yoke 25, and the movable plunger 22 is displaced upward against the magnetic force of the permanent magnet 28 and the repulsive force of the back spring 27. At this time, the contact support 11 is also displaced upward, so that the movable contact 10 comes into contact with the pair of fixed contacts 9, and the closed state is established.

[0039] Here, in the electromagnetic contactor 1 of this embodiment, the thicknesses of the first spacer 34 and the second spacer 37 are adjusted so that the contact gap G between the fixed contact 9 and the movable contact 10 in the interrupted state becomes a target value Gt. Note that the target value Gt is a contact gap that can improve the interruption performance and vibration and impact resistance of the electromagnetic contactor 1.

[0040] Next, a procedure for adjusting the contact gap G of the electromagnetic contactor 1 of this embodiment will be described with reference to FIGS.

[0041] 3, a measuring device such as a laser displacement meter is used to measure a first distance L1 between the movable contact 10 and the contact surface 25b1 with which the second spacer 37 of the other bottom yoke 25b of the electromagnet unit 5 contacts in a non-excited state. Note that the dimension between the movable contact 10 and the contact surface 25a1 with which the first spacer 34 of one bottom yoke 25b of the electromagnet unit 5 contacts is also the same dimension (first distance L1).

[0042] In addition, a measuring device such as a laser displacement meter is used to measure a second distance L2 between the first case side mounting surface 33 of the capsule case 6 and the fixed contact 9 of the fixed contactor 3. The dimension between the second case side mounting surface 36 and the fixed contact 9 is also the same dimension (second distance L2). The second surface of the present invention corresponds to the abutment surfaces 25a1, 25b1.

[0043] The second distance L2 is set to a value greater than the first distance L1, and the unadjusted contact gap Ga is calculated by subtracting the first distance L1 from the second distance L2, as shown in the following formula (1).

[0044] Ga = L2 - L1 …… (1)

[0045] Next, as shown in the following formula (2), the gap between the contacts Ga without adjustment is subtracted from the target value Gt to calculate the gap deficiency Gn.

[0046] Gn = Gt -Gn …… (2)

[0047] Next, the first spacer 34 and the second spacer 37 having the same thickness as the gap shortage amount Gn are selected.

[0048] 2, a first spacer 34 and a second spacer 37 having the same thickness as the gap deficiency Gn are placed on the first unit mounting surface 33 and the second unit mounting surface 36 of the capsule case 6. Next, one bottom yoke 25a and the other bottom yoke 25b of the electromagnet unit 5 are placed on the first spacer 34 and the second spacer 37, and the fixing screw 35 is screwed in to assemble the electromagnet unit 5 to the capsule case 6, whereby the inter-contact gap G between the fixed contact 9 and the movable contact 10 is adjusted to the target value Gt (see FIG. 1).

[0049] Therefore, in the electromagnetic contactor 1 of this embodiment, adjustment of the contact gap G can be completed by a simple installation procedure simply by selecting the first spacer 34 and the second spacer 37 with thicknesses such that the first distance L1 of the electromagnet unit 5 in the non-excited state, the second distance L2 of the capsule case 6, and the contact gap G become the target value Gt, even if there is some variation in the dimensions of the components of the movable contactor 4, the contact support 11, and the electromagnet unit 5. This allows the manufacturing cost of the electromagnetic contactor 1 to be reduced.

[0050] Next, a procedure for calculating the stroke amount S and the wipe amount W of the electromagnetic contactor 1 of this embodiment will be described.

[0051] As shown in the diagram on the right side of FIG. 4, a third distance L3 between the contact surface 25a1 of one bottom yoke 25a of the electromagnet unit 5 and the movable contact 10 in the excited state is measured using a measuring instrument such as a laser displacement meter.

[0052] Then, as shown in the following formula (3), the stroke amount S of the electromagnetic contactor 1 is calculated by subtracting the first distance L1 (when the electromagnet unit 5 is in a non-excited state) from the third distance L3.

[0053] S = L3 - L1 …… (3)

[0054] On the other hand, the wipe amount W of the contact spring 14 of the contact support 11, which applies contact pressure to the movable contactor 4 when the movable contact 10 comes into contact with a pair of fixed contacts 9 to enter the closed state, is calculated by subtracting the inter-contact gap G from the stroke amount S, as shown in the following equation (4).

[0055] W = S - G …… (4)

[0056] Therefore, the electromagnetic contactor 1 of this embodiment 1 can easily calculate the stroke amount S and wipe amount W by simply calculating the first distance L1 of the electromagnet unit 5 in the non-excited state, the third distance L3 of the electromagnet unit 5 in the excited state, and the inter-contact gap G. [Explanation of symbols]

[0057] 1 Magnetic contactor 2. Airtight containers 3 Fixed contact 4 Movable Contact 5 Electromagnet Unit 6 Capsule Case 7 Capsule Cover 8 Screw holes 9 Fixed contacts 10 Movable contacts 11 Contact support 12 Base 13 Holding member 14 Contact Spring 20 spools 21 Sliding collar 22 Movable plunger 23 Armature 24 Outer Yoke 25a,25 bottom yoke 26 Plunger Ring 27 Back Spring 28 Permanent Magnets 29 Auxiliary yoke 30 Spool 31 Coil 32 Connecting part 33 First case side mounting surface 33a, 36a Positioning protrusions 34 First spacer 34a, 37a Positioning holes 35 Fixing screw 36 Second case side mounting surface 37 Second Spacer G Contact gap Gt Target value of contact gap Ga Unadjusted contact gap Gn Gap shortage L1 1st distance L2 2nd distance L3 3rd distance S Stroke volume W Wipe

Claims

1. an electromagnet unit in which a fixed contactor having a fixed contact and a movable contactor having a movable contact that moves toward and away from the fixed contactor are connected via a contact support; and a sealed container that houses the fixed contactor, the movable contactor, and the electromagnet unit in the same space; the electromagnet unit is provided with a unit-side coupling part that is coupled to a container-side coupling part provided on the sealed container in a moving direction of the movable contact, An electromagnetic contactor, characterized in that a flat spacer for adjusting the contact gap between the fixed contact and the movable contact is sandwiched and arranged between the container side connecting portion and the unit side connecting portion.

2. The sealed container includes a cylindrical capsule case having one open end and the other closed end, and a capsule cover that closes the open end of the capsule case, the fixed contact is integrally formed at the other closed end of the capsule case such that the fixed contact protrudes into the capsule case, The electromagnetic contactor according to claim 1, characterized in that the container side connection portion is a case side mounting surface formed on the periphery of the open end of the capsule case, and the spacer is sandwiched and arranged between the case side mounting surface and the unit side connection portion.

3. a first distance L1 is a distance between a first surface of the unit side connecting portion that abuts against the spacer when the electromagnet unit is in a non-excited state and the movable contact along a moving direction of the movable contactor, a second distance L2 is a distance between a second surface of the container side connecting portion with which the spacer abuts and the fixed contact along a moving direction of the movable contact, If the target value of the contact gap is Gt, 3. The electromagnetic contactor according to claim 1, wherein a thickness T of the spacer is set according to the following formula (a): T = Gt - (L2 - L1) ...... (a)

4. In an electromagnetic contactor including a fixed contact having a fixed contact, an electromagnet unit in which a movable contact having a movable contact that moves toward and away from the fixed contact is connected via a contact support, and an airtight container that houses the fixed contact, the movable contact, and the electromagnet unit in the same space, the electromagnet unit is provided with a unit side connecting portion that connects to a container side connecting portion provided in the airtight container in a direction in which the movable contact moves, and a flat spacer that adjusts the contact gap between the fixed contact and the movable contact is disposed between the container side connecting portion and the unit side connecting portion, thereby adjusting the contact gap between the fixed contact and the movable contact, a step of measuring a first distance L1 along a moving direction of the movable contact between a first surface of the unit side connecting portion that abuts against the spacer and the movable contact when the electromagnet unit is in a non-excited state, before connecting the electromagnet unit to the sealed container; measuring a second distance L2 between a second surface of the container side connecting portion against which the spacer abuts and the fixed contact along a moving direction of the movable contact; a step of setting a thickness T of the spacer by the following formula (a), where Gt is a target value of a contact gap and T is a thickness of the spacer; T = Gt - (L2 - L1) ...... (a) A method for adjusting the contact gap of an electromagnetic contactor, characterized in that the contact gap between the fixed contact and the movable contact is adjusted by connecting the container side connecting portion and the unit side connecting portion with the spacer of thickness T sandwiched therebetween.

5. A method for calculating a stroke amount of an electromagnetic contactor using the first distance L1 measured in the method for adjusting a contact gap of an electromagnetic contactor according to claim 4, Before connecting the electromagnet unit to the sealed container, a third distance L3 is measured along a moving direction of the movable contact between the first surface of the unit side connecting portion that abuts against the spacer and the movable contact when the electromagnet unit is in an excited state; A method for calculating a stroke amount of an electromagnetic contactor, comprising the steps of: calculating a stroke amount S according to the following formula (b): S = L3 - L1 ...... (b)

6. A method for calculating a wipe amount of an electromagnetic contactor, comprising the steps of: calculating a wipe amount W by the following formula (c) using a target value Gt of the contact gap used in the method for adjusting the contact gap of an electromagnetic contactor of claim 4 and a stroke amount S calculated in the method for calculating the stroke amount of an electromagnetic contactor of claim 5. W = S - W ...... (c)

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