JP3855685B2 - Magnetic contactor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic contactor that normally opens and closes an auxiliary contact when a main contact of the electromagnetic contact is welded.
[0002]
[Prior art]
A conventional electromagnetic contactor is shown in FIG. FIG. 12 is a cross-sectional view of an electromagnetic contactor. In this figure, the electromagnetic contactor is composed of a movable part that is moved by electromagnetic force and a fixed part that remains fixed. The movable part is composed of a movable iron core 1 and a crossbar 2. It is composed of main movable contacts 4a, 4b, 4c and the like. The movable iron core 1 is connected to the crossbar 2 by a pin 3, and the main movable contacts 4a, 4b and 4c having contacts are provided with presser springs 5a, 5b and 5c, respectively, and the contact springs 6a, 6b and 6c are compressed. The crossbar 2 is supported by being inserted into the windows 2a, 2b, 2c of the cross bar 2 via the main movable contacts 4a, 4b, 4c so as to oppose the contacts of the main fixed contacts 8a, 8b, 8c. Similarly, the upper auxiliary movable contacts 9a and 9b and the lower auxiliary movable contacts 10a and 10b are mounted on the windows 2d and 2e of the crossbar 2 by compressing the auxiliary contact springs 11a and 11b. The contactors 9a and 9b and the upper auxiliary fixed contacts 12a and 12b constitute two pairs of normally closed contacts that are closed when the power of the coil 21 of the electromagnetic contactor is shut off. Similarly, the lower auxiliary movable contacts 10a and 10b The lower auxiliary stationary contacts 13a and 13b constitute two pairs of normally open contacts that are opened when the coil 21 of the magnetic contactor is turned off.
[0003]
The movable part is housed in the base 14, and a rubber plate 26 is inserted between the support side upper surface of the movable iron core 1 and the bottom surface of the cross bar 2. An arc box 15 is fixed to the base 14 with screws. Here, the gap between the base 14 and the crossbar 2 is for smooth operation of the crossbar 2. In addition, 31 is a recessed part provided in the inner bottom face of the cross bar 2, and this recessed part 31 is provided for the distortion removal at the time of casting of the cross bar 2. As shown in FIG.
[0004]
On the other hand, the fixed part is configured as follows. The fixed portion mainly includes a fixed iron core 20, a coil 21, and main fixed contacts 8a, 8b, and 8c. The fixed iron core 20 is accommodated in a mounting base 23 via a rubber plate 22, and the coil 21 is wound around a bobbin 24 and is fixed around a leg portion of the fixed iron core 20. Trip springs 25 a and 25 b are inserted in a compressed state between the crossbar 2 and the mounting base 23, and the base 14 is screwed to the mounting base 23. In this completed state, a predetermined gap is secured on the attracting surfaces of the movable iron core 1 and the fixed iron core 20. The rubber plates 22 and 26 are both shock buffering rubber plates, which are inserted mainly to buffer the impact force generated by the adsorption of the iron core when the electromagnetic contactor is inserted.
[0005]
The operation of the magnetic contactor will be described with reference to FIGS. First, when the coil current is interrupted, the crossbar 2 and the base 14 are in contact with each other as shown in FIG. 13, and when the current flows through the coil 21, the fixed iron core 20 is magnetized, and the fixed iron core 20 and the movable iron core are in contact with each other. Electromagnetic attraction force acts between 1 and 1. Due to this suction force, the cross bar 2 and the like mainly collide with the fixed portion against the release springs 25a and 25b and the contact springs 6a, 6b and 6c, and as shown in FIG. 14, the upper surface of the cross bar 2 and the inner surface of the base 14 Are brought into contact with each other, and the movable iron core 1 and the stationary iron core 20 are stationary while securing a predetermined gap. As a result, the contacts of the main movable contacts 4a, 4b and 4c as the first movable contacts and the contacts of the fixed contacts 8a, 8b and 8c as the first fixed contacts are pressed and closed. The contacts of the upper auxiliary movable contacts 9a, 9b as the second movable contacts and the contacts of the upper auxiliary fixed contacts 12a, 12b as the second fixed contacts are opened apart, and the lower auxiliary movable contacts 10a, 10b are opened. The contacts and the contacts of the lower auxiliary fixed contacts 13a and 13b are contact-pressed and closed.
[0006]
On the other hand, when the current of the coil 21 is interrupted, the electromagnetic force disappears, and the crossbar 2 and the like collide with the base 14 mainly by the restoring spring force of the tripping springs 25a and 25b, and the movable portion and the fixed portion collide. Due to the occurrence of rebound (hereinafter referred to as “bounce phenomenon”), the top surface of the crossbar 2 is once at a distance LB from the inner surface of the base 14 as shown in FIG. 15, and the rebound crossbar 2 is as shown in FIG. To rest. As a result, the contacts of the main movable contacts 4a, 4b, and 4c and the contacts of the fixed contacts 8a, 8b, and 8c are separated and opened. The contacts of the upper auxiliary movable contacts 9a and 9b and the contacts of the upper auxiliary fixed contacts 12a and 12b are contact-pressed and closed, and the contacts of the lower auxiliary movable contacts 10a and 10b and the lower auxiliary fixed contacts 13a and 13b are closed. The contact opens away.
[0007]
Based on the above operation, the amount of compression of the contact spring in a state where the movable contact and the stationary contact in a steady state are in contact and pressed is referred to as overtravel. Therefore, the actual overtravel of each movable contact and each fixed contact is as follows. First, in the state where the current of the coil 21 flows and the contacts of the main movable contacts 4a, 4b, and 4c and the contacts of the main fixed contacts 8a, 8b, and 8c are in contact pressing as shown in FIG. 14, the contact spring 6a. , 6b, 6c, the distance measured from the lower reference point of the windows 2a-2c of the crossbar 2 is overtravel. Similarly, when the contacts of the lower auxiliary movable contacts 10a and 10b and the contacts of the lower auxiliary fixed contacts 13a and 13b are in contact with each other as shown in FIG. 14, the compression amount L2 of the auxiliary contact springs 11a and 11b is Overtravel. Further, in the state where the current of the coil 21 is cut off and the contacts of the lower auxiliary movable contacts 9a and 9b and the contacts of the lower auxiliary fixed contacts 12a and 12b are in contact and pressed as shown in FIG. 13, the auxiliary contact spring 11a. , 11b compression amount L3 is overtravel.
[0008]
This overtravel is primarily the amount of compression LBU of the contact spring that presses the contact so that the contact of the contact does not open even if a rebound amount due to the bounce phenomenon occurs. Secondly, the contact spring compression amount LED that provides a good contact between the contacts of the contacts to improve electrical conduction. Third, the contact spring compression amount LER that maintains the contact of the contactor closed even when the crossbar 2 is inclined by the gap g between the side surface 2s of the crossbar 2 and the inner surface 14i of the base 14. Although it must be determined in consideration of the above three, in general, the contact spring compression amount LBU that presses the contact so that the contact of the contact does not open even if the amount of rebound caused by the bounce phenomenon occurs is the largest. The overtravel is set to be slightly larger than the compression amount LBU.
[0009]
[Problems to be solved by the invention]
Since the conventional electromagnetic contactor is configured as described above, the contact of the main movable contact 4a and the contact of the main fixed contact 8a or the main movable contact 4c other than the central portion of the main contact by interruption of abnormal current. 16 and the main fixed contact 8c are welded, the crossbar 2 is pushed upward by the release springs 25a and 25b as shown in FIG. 16, but the contact of the main movable contact 4c and the main fixed contact 8c Since the contact is welded, the contact cannot be moved upward, and it is tilted and stopped so as to narrow the gap between the base 14 and the side surface of the crossbar 2. For this reason, the contact point of the upper auxiliary movable contactor 9a and the contact point of the upper auxiliary fixed contactor 12a that must be opened may be closed. Therefore, when detecting an abnormal state by closing the contact of the auxiliary contact, it is difficult to detect the abnormality.
[0010]
The present invention has been made to solve the above-described problems, and an electromagnetic contactor that does not cause a problem in the operation of the auxiliary contact even if the contact of the main contact is welded due to interruption of abnormal current or the like. It is to provide.
[0011]
Since the conventional electromagnetic contactor is configured as described above, the rubber plate 26 for shock buffering is fixed to the recess 31 of the crossbar 2 and is not sufficient to suppress the bounce phenomenon. The child contacts could malfunction.
[0012]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electromagnetic contactor with improved reliability in which a contact of a contactor does not malfunction due to a bounce phenomenon.
[0013]
Since the conventional electromagnetic contactor is configured as described above, the overtravel is set to be slightly larger than the amount of rebound caused by the bounce phenomenon. For this reason, the stroke of the crossbar 2 becomes long and the movable iron core and the like are enlarged.
[0014]
The present invention has been made to solve the above-described problems, and aims to provide a small electromagnetic contactor by shortening the stroke of the crossbar.
[0015]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an electromagnetic contactor comprising a main movable contact and an auxiliary movable contact provided in a movable portion biased by a spring force, a main fixed contact and an auxiliary fixed contact fixed to a fixed portion, and the main movable contact. A first contact spring that presses the contact and the main fixed contact; and a base that houses the movable part, and constitutes a normally open contact that opens when the power is shut off by the main movable contact and the main fixed contact, The normally movable contact and the stationary auxiliary contact constitute a normally closed contact that is closed when the power is shut off, and the normally closed contact is operated with respect to the normally open contact by operating the movable part. The In an electromagnetic contactor that opens and closes in a conflicting manner, the distance between the auxiliary movable contact and the auxiliary fixed contact at the normally closed contact Is , The normally open contact Welding And this Welding The movable part is tilted using the In case Even if the auxiliary movable contact moves due to this inclination, the distance from the auxiliary fixed contact is not closed.
[0017]
First 2 In the electromagnetic contactor according to the invention, the compression amount of the second contact spring that presses the auxiliary movable contact and the auxiliary fixed contact is determined by the opening / closing operation. By This is larger than the amount of rebound generated when the movable part collides with the base.
[0018]
First 3 In the electromagnetic contactor according to the present invention, the movable part has a main movable contact and an auxiliary movable contact. Wearing And a movable iron core as a drive source of the movable part, and the amount of rebound of the movable part on the coupling surface of the crossbar and the movable iron core should be within the compression amount of the second contact spring. A rebound absorber is fixed.
[0019]
First 4 In the electromagnetic contactor according to the invention, a rebound absorber is fixed to one of the collision surfaces of the movable part and the base so that the rebound amount of the movable part is within the compression amount of the second contact spring. .
[0020]
First 5 In the magnetic contactor according to the invention, the rebound absorber is a rebound absorber having a rebound elastic modulus of 14% or less, which is a physical quantity based on the energy absorption rate due to internal damping.
[0021]
First 6 The electromagnetic contactor according to the invention has a main movable contact and an auxiliary movable contact. Wearing Crossbar, movable iron core From A movable portion configured to be biased by a spring force; a main fixed contact and an auxiliary fixed contact fixed to the fixed portion; and a base that houses the movable portion, and a power source is provided by the main movable contact and the main fixed contact. A normally open contact that opens when shut off is configured, a normally closed contact that is closed when the power is shut off is configured by the auxiliary movable contact and the auxiliary fixed contact, and the movable section is operated to operate the normally closed contact with respect to the normally closed contact. In the electromagnetic contactor that opens and closes the contacts in a reciprocal manner, a rebound absorber having a rebound resilience of 14% or less, which is a physical quantity based on an energy absorptivity due to internal damping, is provided on the coupling surface of the crossbar and the movable core. It is a thing.
[0022]
First 7 The electromagnetic contactor according to the invention has a main movable contact and an auxiliary movable contact. Wearing Crossbar, movable iron core From A movable portion configured to be biased by a spring force; a main fixed contact and an auxiliary fixed contact fixed to the fixed portion; and a base that houses the movable portion, and a power source is provided by the main movable contact and the main fixed contact. A normally open contact that opens when shut off is configured, a normally closed contact that is closed when the power is shut off is configured by the auxiliary movable contact and the auxiliary fixed contact, and the movable section is operated to operate the normally closed contact with respect to the normally closed contact. In an electromagnetic contactor that opens and closes so that the contact is in a reciprocal manner, a rebound absorption having a rebound resilience of 14% or less, which is a physical quantity based on an energy absorptivity due to internal damping, at any of the collision surfaces of the movable part and the base. It has a body.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
An embodiment of the present invention is shown in FIG.
FIG. 1 is a perspective view showing a configuration of a movable part of an electromagnetic contactor.
In FIG. 1, 4a, 4b and 4c are main movable contacts as main movable contacts, 8a, 8b and 8c are main fixed contacts as main fixed contacts, and 9a and 9b are upper auxiliary movable contacts as auxiliary movable contacts. , 12a, 12b are upper auxiliary fixed contacts as auxiliary fixed contacts.
In order to prevent malfunctions in the operation of the auxiliary contact even if the contacts of the main contact are welded due to abnormal current interruption or the like, the upper auxiliary movable contact 9a, 9b and the upper auxiliary fixed contact 12a, 12b There are means to increase the distance between the contacts. As this means, the position of the upper auxiliary movable contacts 9a, 9b is lowered from the conventional one, or the position of the upper auxiliary fixed contacts 12a, 12b is raised from the conventional one.
The distance between the contacts of the auxiliary contact is such that either the main movable contact 4a, 4c or the main fixed contact 8a, 8c is welded, and the crossbar 2 is tilted with the welded contact as a fulcrum. Even if the upper auxiliary movable contactor 9a or the upper auxiliary movable contactor 9b moves upward, a distance at which the contact of the upper auxiliary contactor is not closed is set.
[0024]
In FIG. 1, the contact of the main movable contact 4c and the main fixed contact 8c are welded, and the crossbar 2 tilts with the welded contact as a fulcrum, and even if the upper auxiliary movable contact 9a moves upward due to this tilt, The distance between the contacts of the auxiliary movable contact 9a and the upper auxiliary fixed contact 12a is ensured by an amount that does not close the contact.
Although there is a means for narrowing the gap g between the side surface 2s of the crossbar 2 and the inner surface 14i of the base 14, it is not general because there is a limit in terms of processing accuracy between the crossbar 2 and the base 14.
In addition, the overtravel L3 that is the compression amount of the contact springs 11a and 11b of the upper auxiliary contactor is secured as in the conventional case, and the contactors 9a and 12a that are to be closed are opened due to the occurrence of the bounce phenomenon. Also prevent.
[0025]
The operation at the time of abnormality will be described.
When the contact of the main movable contact 4c and the pair of the main fixed contact 8c are welded due to the interruption of the abnormal current, the crossbar 2 is pushed upward by the release springs 25a and 25b as shown in FIG. Is welded, the crossbar 2 cannot move upward, and stops tilting so as to narrow the gap g between the base 14 and the crossbar 2. The upper auxiliary movable contact 9a and the upper auxiliary fixed contact 12a are open, and the upper auxiliary contact operates normally.
[0026]
Embodiment 2. FIG.
In Embodiment 1, the gap between the contacts of the auxiliary contact is widened to prevent malfunction of the auxiliary contact.
However, the amount of movement of the crossbar 2 increases, and this increase in the amount of movement results in an increase in the size of the movable iron core 1 and the coil 21 that serve as a driving source for moving the crossbar 2 and an increase in power consumption.
Therefore, if the overtravel L3 is shortened to suppress the movement amount of the crossbar 2, the crossbar 2 rebounds by a distance LB as shown in FIG. 2 due to the bounce phenomenon, and the contacts of the auxiliary contacts 9a and 12a that should be closed originally. And the contacts of the auxiliary contacts 9b and 12b are opened.
The result of this experiment is shown in FIG.
In FIG. 3, ST, the vertical axis, ST is the amount of displacement of the movable part, STS is the state where the movable part is stationary, STP is the return process of the movable part, STB1 and STB2 are the rebound of the movable part, and STE is the return of the movable part Each of them shows a stationary state after finishing.
Further, UC is an electrical detection of the open / closed state of the upper auxiliary contact, UCF indicates the open state, and UCN indicates the closed state. The horizontal axis indicates time.
[0027]
From FIG. 3 (a), after the stroke of the movable portion of about 7 mm is returned by the return process STP, two rebounds STB1 and STB2 occur.
When the first rebound STB1 occurs, it is open that one of the contacts of the upper auxiliary movable contacts 9a, 9b and the contacts of the upper fixed contacts 12a, 12b is originally closed.
In addition, even if it operates on the same conditions from FIG.3 (b), since the amount of rebound STB1 changes with variations, the contact of upper auxiliary movable contactor 9a, 9b and the contact of upper stationary contactor 12a, 12b operate normally. ing.
Therefore, it has been confirmed that the limit of overtravel when the conventional shock absorber 26 is fixed to the recess 31 of the crossbar 2 exists in the vicinity of 3 mm.
[0028]
Next, with reference to FIG. 4, an embodiment in which the gap between the contacts of the auxiliary contact is widened, the overtravel is shortened, and the amount of rebound caused by the bounce phenomenon is reduced without increasing the amount of movement of the crossbar 2 will be described with reference to FIG. To do.
[0029]
In FIG. 4, the movable iron core 1 is connected to the inside of the crossbar 2 by a pin 3 via a rebound absorber 32 as a buffer material, and constitutes a movable part.
The rebound absorber 32 having a thickness several times the depth of the recess 31 is compressed by the crossbar 2 and the movable iron core 1 and fixed to the recess 31.
A snap pin 37 is fitted to the tip of the pin 3. Reference numerals 35 and 36 denote connecting holes for connecting the movable iron core 1 to the crossbar 2 with pins 3.
The gap between the pin 3 and the connection hole 35 is secured to absorb the deflection amount of the rebound absorber 32.
[0030]
The characteristics of the rebound absorber 32 as a buffer material will be described.
The rebound resilience of the cushioning material is a so-called rebound coefficient, and is defined by the speed ratio before and after the collision of the object.
For example, according to “αGEL Technical Data” by Siegel Corporation, the rebound resilience is a physical quantity based on the energy absorption rate due to the internal damping of the buffer material.
FIG. 5 is a characteristic curve diagram showing the resistance versus deflection when the object collides with the cushioning material. In FIG. 5, the resistance force generated on the impacted object changes from stroke A to stroke B as the deflection increases. At B, the maximum resistance force FMAX is reached. Thereafter, after reaching the maximum deflection XMAX, the stroke C is pushed back to the cushioning material through the stroke D.
Here, Wa is the lost energy converted into thermal energy by the internal attenuation of the buffer material, and Wb is the restoration energy of the buffer material.
(Wa + Wb) is the collision energy that the collision object had.
Therefore, the resilience modulus is proportional to Wb / (Wa + Wb).
[0031]
The energy absorption rate E at this time is Wa / (Wa + Wb).
The greater the E, the smaller the repulsion.
The maximum impact force FMAX (maximum resistance force) is (Wa + Wb) / (H · XMAX).
Further, H has an impact efficiency of (Wa + Wb) / (FMAX · XMAX), and the maximum impact force FMAX decreases as the impact efficiency H increases from the above equation.
[0032]
From the above, in order to reduce the impact of the movable part of the magnetic contactor and to suppress the bounce phenomenon of the electromagnetic contactor, it is necessary to fix the rebound absorber 32 as a material having different characteristics to the recess 31.
[0033]
Next, the gap between the contacts of the auxiliary contact is widened, the overtravel is shortened, and the stroke of the crossbar 2 is kept the same as the conventional one.
Also, overtravel is the contact spring compression LED that gives contact pressure between the contacts of the contacts to improve electrical conduction. Furthermore, even if the crossbar 2 is inclined due to the gap g between the side surface 2s of the crossbar 2 and the inner surface 14i of the base 14, a contact spring compression amount LER is required to maintain the contact of the contactor closed. Since the compression amount LED and the compression amount LER are accumulated, the total compression amount LT of the contact spring becomes LED + LER.
Therefore, since the total compression amount LT must be ensured, it is not practical to suppress the bounce phenomenon to zero.
About 2 mm of overtravel is required from this point.
[0034]
As shown in FIG. 6, the bounce phenomenon at the time of releasing the magnetic contactor suppresses the amount of rebound of the crossbar 2 to LB ′.
The experimental results are shown in FIG.
In FIG. 7, the rebound STB1 of the movable part is about 1 mm or less, and the contacts of the upper auxiliary movable contacts 9a and 9b and the contacts of the upper fixed contacts 12a and 12b operate normally. The rebound resilience is 1/7, which is 14% or less.
Therefore, a rebound absorber 32 having a rebound resilience of 14% or less is inserted into the recess 31.
[0035]
The rebound absorber 32 is compressed and mounted in the recess 31. However, the rebound absorber 32 itself is a two-component mixed material composed of a main agent and a curing agent, and the rebound absorber 32 is formed using a two-component mixing / discharging machine or the like. It is dripped at the recessed part 31 with a liquid mixture.
For example, the rubber 32 of Example 1 shown in FIG. 4 is fixed as follows. The dripping amount is selected in advance so as to obtain a predetermined height after curing. As the mixed liquid injected into the recess 31 is cured, the adhesive strength increases with respect to the surface of the recess 31.
[0036]
Embodiment 3 FIG.
An example in which the rebound absorber is fixed at a position different from that of the second embodiment will be described with reference to FIG.
In FIG. 8, reference numeral 42 denotes a rebound absorber, which is composed of four block-shaped pieces and is made of the same material as the rebound absorber 32.
The rebound absorber 42 is fixed to the inner surface of the base 14 with an adhesive on the surface where the crossbar 2 collides with the base 14 when released.
Other configurations are the same as those in the second embodiment.
[0037]
The operation of the electromagnetic contactor configured as described above will be described.
When the current of the coil 21 is cut off, the electromagnetic force disappears, and when the movable part collides with the base 14 mainly due to the restoring spring force of the tripping springs 25a and 25b, the upper surface of the crossbar 2 collides with the rebound absorber 42. And much of this collision energy is converted into heat by internal damping of the rebound absorber 42.
As a result, the bounce phenomenon is greatly reduced.
[0038]
The rebound absorber 42 of this embodiment may be fitted into a recess provided on the inner bottom surface of the base 14.
The small piece may be a strip-like plate.
Furthermore, even if the repellent absorber 42 is fixed to the collision surface 43 between the crossbar 2 and the base 14 as shown in FIG. 9, the same functions and effects as in this embodiment are obtained.
[0039]
Embodiment 4 FIG.
An embodiment in which the rebound absorber is fixed to another position will be described with reference to FIG.
10, 51 and 52 are pin support portions of the crossbar 2, 53a and 53b are rebound absorbers, and the rebound absorbers 53a and 53b are block-like covers made of the same material as the rebound absorber 32. Hook portions 54a and 54b are provided, respectively.
The hook portions 54a and 54b are hung on the frame 55 of the cross bar 2, and the inner side surfaces of the rebound absorbers 53a and 53b are fitted to both side surfaces 51a and 52a of the pin support portions 51 and 52 of the cross bar 2, respectively. .
[0040]
The operation of the electromagnetic contactor configured as described above will be described.
When the current of the coil 21 is cut off, the electromagnetic force disappears, and when the movable part collides with the base 14 mainly due to the restoring spring force of the tripping springs 25a and 25b, the upper surface of the crossbar 2 has the rebound absorbers 53a and 53b. Most of the collision energy is converted into heat by internal damping of the rebound absorbers 53a and 53b. As a result, the bounce phenomenon is greatly reduced.
[0041]
The repulsion absorbers 53a and 53b must have collision surfaces 56a and 56b with the base 14 in order to suppress the bounce phenomenon.
Therefore, as long as the impact surfaces 56a and 56b of the rebound absorbers 53a and 53b are present, the means for fixing to the crossbar 2 need not be the hook portions 54a and 54b.
For example, the rebound absorbers 53 a and 53 b may be configured in a cap shape, provided with a hole in the center, and fixed to the pin support portions 51 and 52 of the crossbar 2 with the connecting pin 3 of the movable iron core 1.
[0042]
Embodiment 5 FIG.
An embodiment in which the rebound absorber is fixed to another position will be described with reference to FIG.
In FIG. 11, reference numeral 102 denotes a cross bar, and this cross bar 102 is provided with two pairs of square-shaped through holes 62 a to 62 d formed on the connecting surface with the movable core 1, and 63 a and 63 b are movable cores. The support base 67a to 67d having a length substantially the same as the thickness t of 102 is a rebound absorber, and the rebound absorbers 67a to 67d are formed in a block shape so as to be fitted in the holes 62a to 62d. The material is the same as that of the absorber 32. A pair of rebound absorbers 67a to 67d are fixed to both ends of the support bases 63a and 63b, respectively. The repellent absorbers 67 a to 67 d fixed to the support bases 63 a and 63 b are fitted into the holes 62 a to 62 d and protruded, and then the movable iron core 1 is connected by the pin 3 and the snap pin 37. The support base 63a and the rebound absorbers 67a and 67b may be integrally formed of the same material as that of the rebound absorber 32.
[0043]
The operation of the electromagnetic contactor configured as described above will be described.
When the current of the coil 21 is interrupted, the electromagnetic force disappears, and when the movable portion collides with the base 14 mainly by the restoring spring force of the tripping springs 25a and 25b, the collision surface 43 of the crossbar 102 is rebounded by the rebound absorber 67a. Since most of the collision energy collides with .about.67d, most of the collision energy is converted into heat by the internal attenuation of the rebound absorbers 67a to 67d.
As a result, the bounce phenomenon is greatly reduced.
[0044]
【The invention's effect】
First of According to the invention, even if the contacts of the main contact are welded due to interruption of abnormal current or the like, there is an effect of obtaining an electromagnetic contactor in which the operation of the auxiliary contact does not occur and the reliability is improved.
[0045]
First 2 According to the invention, there is an effect of obtaining an electromagnetic contactor in which the contact of the electromagnetic contactor does not malfunction due to the bounce phenomenon.
[0046]
First 3 According to the invention, auxiliary contact Child The impact of the movable part can be reduced.
[0047]
First 4 According to this invention, the bounce phenomenon of an electromagnetic contactor can be suppressed.
[0048]
First 5 According to the invention, the bounce phenomenon can be remarkably mitigated because the rebound absorber has a rebound resilience of 14% or less, which is a physical quantity based on the energy absorption rate due to internal damping.
[0049]
First 6 According to the invention, since the rebound absorber having a rebound resilience of 14% or less, which is a physical quantity based on the energy absorptivity due to internal damping, is provided on the coupling surface between the crossbar and the movable core, the auxiliary contact Child The impact of the movable part can be reduced.
[0050]
First 7 According to the invention, the bounce phenomenon is greatly reduced because any of the collision surfaces between the movable part and the base is provided with a rebound absorber having a rebound elastic modulus of 14% or less, which is a physical quantity based on the energy absorption rate due to internal damping. Can be relaxed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an electromagnetic contactor according to an embodiment of the present invention.
FIG. 2 is an operation explanatory view showing the operation of the electromagnetic contactor of FIG. 1;
FIG. 3 is an operation curve diagram showing the operation of the electromagnetic contactor of FIG. 1;
FIG. 4 is a configuration diagram of an electromagnetic contactor according to another embodiment of the present invention.
FIG. 5 is a characteristic curve diagram of rebound resilience according to an embodiment of the present invention.
6 is an operation diagram of a bounce phenomenon by the electromagnetic contactor of FIG. 4;
7 is an operation curve diagram showing the operation of the electromagnetic contactor of FIG. 4;
FIG. 8 is a configuration diagram of an electromagnetic contactor according to another embodiment of the present invention.
FIG. 9 is a configuration diagram of an electromagnetic contactor according to another embodiment of the present invention.
FIG. 10 is a configuration diagram of an electromagnetic contactor according to another embodiment of the present invention.
FIG. 11 is a configuration diagram of an electromagnetic contactor according to another embodiment of the present invention.
FIG. 12 is a configuration diagram of a conventional electromagnetic contactor.
FIG. 13 is an operation explanatory view showing the operation of a conventional electromagnetic contactor.
FIG. 14 is an operation explanatory view showing the operation of a conventional electromagnetic contactor.
FIG. 15 is an operation explanatory view showing the operation of a conventional electromagnetic contactor.
FIG. 16 is an operation explanatory view showing the operation of a conventional electromagnetic contactor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Iron core (movable iron core), 2 Crossbar, 4a-4c 1st movable contact (contact of main movable contact), 8a-8c 1st fixed contact (contact of main fixed contact), 9a, 9b, 10a 10b Second movable contact (contact of main auxiliary movable contact), 11a, 11b Contact spring, 12a, 12b, 13a, 13b Second fixed contact (contact of main auxiliary fixed contact), 32, 42, 53a 53b, 67a-67d Rebound absorber, 102 Crossbar.

Claims (7)

The main movable contact and the auxiliary movable contact provided on the movable portion biased by the spring force, the main fixed contact and the auxiliary fixed contact fixed to the fixed portion, and the main movable contact and the main fixed contact are pressed. A first contact spring; and a base for housing the movable part. The main movable contact and the main fixed contact constitute a normally open contact that is opened when the power is shut off. The auxiliary movable contact and the auxiliary fixed contact shut off the power. sometimes constitutes a normally closed contact which is closed, by operating the movable portion with respect to the normally open contact, an electromagnetic contactor for switching operation to reciprocal said normally closed contact, the auxiliary movable contact in the normally closed contact the distance between the auxiliary fixed contact is above the normally open contact welding, in the case where the movable portion as a fulcrum the welding position there were inclined, the auxiliary fixed contact even if the auxiliary movable contact is moved by the inclination Electromagnetic contactor, characterized in that a distance which is not closed. The compression amount of the second contact spring that presses the auxiliary movable contact and the auxiliary fixed contact is larger than a rebound amount generated when the movable portion collides with the base by the opening / closing operation. The electromagnetic contactor according to 1. The movable part is composed of a cross bar for mounting the main movable contact and the auxiliary movable contact, and a movable iron core as a drive source of the movable part, and the amount of rebound of the movable part on the coupling surface of the cross bar and the movable iron core is as described above. The electromagnetic contactor according to claim 2, wherein a rebound absorber is fixed so as to be within a compression amount of the second contact spring. 3. The electromagnetic wave absorber according to claim 2, wherein a rebound absorber is fixed to one of the collision surfaces of the movable part and the base so that a rebound amount of the movable part is within a compression amount of the second contact spring. Contactor. 5. The electromagnetic contactor according to claim 3, wherein the rebound absorber is a rebound absorber having a rebound resilience of 14% or less, which is a physical quantity based on an energy absorption rate due to internal damping. Consists of a cross bar and a movable iron core for mounting the main movable contact and auxiliary movable contact, and a movable part energized by a spring force, a main fixed contact and auxiliary fixed contact fixed to the fixed part, and the movable part stored therein A normally open contact that is opened when the power is shut off by the main movable contact and the main fixed contact, and a normally closed contact that is closed by the auxiliary movable contact and the auxiliary fixed contact when the power is shut off. In the electromagnetic contactor that operates the movable part to open and close the normally closed contact so that the normally closed contact is opposite, the coupling surface between the cross bar and the movable iron core is based on the energy absorption rate due to internal attenuation. An electromagnetic contactor comprising a rebound absorber having a rebound resilience of 14% or less, which is a physical quantity. Consists of a cross bar and a movable iron core for mounting the main movable contact and auxiliary movable contact, and a movable part energized by a spring force, a main fixed contact and auxiliary fixed contact fixed to the fixed part, and the movable part stored therein A normally open contact that is opened when the power is shut off by the main movable contact and the main fixed contact, and a normally closed contact that is closed by the auxiliary movable contact and the auxiliary fixed contact when the power is shut off. In an electromagnetic contactor that operates the movable part to open and close the normally-closed contact so that the normally-closed contact is opposite to the normally-closed contact, energy absorption due to internal damping is applied to any of the collision surfaces of the movable part and the base. An electromagnetic contactor comprising a rebound absorber having a rebound resilience of 14% or less, which is a physical quantity based on a modulus.

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