JP4826617B2 - Electromagnetic switchgear - Google Patents

Description

The present invention relates to an electromagnetic switching device that opens and closes when a movable contact contacts or separates from a fixed contact by an attractive force of an electromagnet having a coil and an elastic return force of a movable spring provided at the end of the movable contact. It is about.

Conventionally, an electromagnetic switching device that opens and closes when the movable contact contacts or separates from the fixed contact by the attractive force of the electromagnetic block having the coil and the elastic return force of the movable spring provided at the end of the movable contact. Is provided.

By the way, when the ambient temperature is low, such as in winter or in a cold region, there is a problem that icing phenomenon occurs in a sealed case, resulting in poor contact conduction. Hereinafter, the freezing phenomenon will be briefly described. By energization, the coils and bobbins in the case, the contacts and terminals forming the energization path generate heat, and the temperature in the case rises. At this time, if the external temperature is very low, a temperature difference occurs between the inside and outside of the case, and thus convection of air containing water vapor occurs inside the case. And
The amount of saturated water vapor around the inner wall of the case is reduced, and water vapor contained in the air in the case becomes water droplets, and condensation occurs on the inner wall of the case, the movable contact, and the fixed contact. And if it will be in a non-energized state, the temperature in a case will be gradually cooled by external temperature, and the water drop adhering to the member surface will freeze. Such an icing phenomenon frequently occurs particularly on the surface of a movable contact or a fixed contact formed of a metal material having a higher thermal conductivity than that of a resin member.

On the other hand, an electromagnetic switching device is provided in which a shielding wall that shields air flowing toward the fixed contact and the movable contact is provided on the inner bottom portion of the case to prevent freezing of the fixed contact and the movable contact (patent) Reference 1).
JP 2007-323883 A

However, the conventional electromagnetic switchgear shields only the air flowing along the inner bottom with respect to the convection of air containing water vapor caused by the temperature difference between the inside and outside of the case. For example, the stationary contact and the movable contact from the vicinity of the coil No measures were taken against the convection flowing toward the east, and the effect of preventing freezing was insufficient.

The present invention has been made in view of the above reasons, and its purpose is to more efficiently suppress the formation of icing on the fixed contact and the movable contact, and improve the contact performance between the contacts in a low temperature environment. An object of the present invention is to provide an electromagnetic switchgear that can be used.

In order to achieve the above object, the movable contact is made to move against the fixed contact by the attraction force of the electromagnet having a coil and the elastic return force of the movable spring provided at the end of the movable contact. In an electromagnetic switching device that opens and closes by contacting / separating, a main body having the electromagnet and the movable spring, a fixed contact terminal having the fixed contact at one end and a terminal piece at the other end. A box-like case for accommodating the main body and the fixed contact terminal therein, and the terminal piece protrudes to the outside of the case, and the one end portion and the other end portion of the fixed contact terminal And a connecting part for collecting dew condensation generated due to a temperature difference between the inside and outside of the case. The distance from the coil to the connecting part is from the coil to the fixed contact. Shorter than It is characterized in that is.

According to the present invention, the terminal piece protrudes to the outside of the case, and is generated due to a temperature difference between the inside and outside of the case at the connecting portion that connects the one end portion and the other end portion of the fixed contact terminal. Since there is a collection part that collects dew condensation, the temperature of the collection part decreases through the terminal piece that comes into contact with the outside air of the case even when energized in a low temperature environment, The water vapor in the case is collected as dew condensation in the collecting unit before it adheres to the fixed contact and the movable contact and causes dew condensation. Therefore, it is possible to more efficiently suppress the occurrence of icing on the fixed contact and the movable contact, and improve the contact performance between the contacts in a low temperature environment. Further, since the distance from the coil to the connecting portion is shorter than the distance from the coil to the fixed contact, the temperature increases from the vicinity of the coil where the temperature is high due to heat generated by energization, The air containing water vapor can reach the connecting portion before the fixed contact. Therefore, the said collection part can collect more water vapor | steam as condensation than the said fixed contact.

The invention of claim 2 is characterized in that, in the invention of claim 1, the fixed contact terminal is formed in a substantially band shape as a whole.

According to the present invention, since the fixed contact terminal is formed in a substantially band shape as a whole, the trapping portion efficiently blocks convection of air containing water vapor, and more water vapor. Can be collected as condensation.

According to the present invention, it is possible to more efficiently suppress the occurrence of icing on the fixed contact and the movable contact, and to improve the contact performance between the contacts in a low temperature environment.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. In the following description, the vertical and horizontal directions are defined in FIG.

As shown in FIG. 1, the electromagnetic switching device according to the first embodiment has a main body portion 2, a fixed contact terminal 3, and a main body portion 2 and a fixed contact terminal 3 accommodated therein, and is a substantially rectangular parallelepiped box as a whole. The case 1 is formed in a shape, and is inserted into a socket (not shown) and attached.

As shown in FIG. 1, the case 1 includes a body 4 made of a box-shaped synthetic resin molded product having an open bottom surface, and a base 5 formed in a flat, substantially rectangular plate shape. 5
Is formed from above. The base 5 has a total of four insertion holes that penetrate the elongated rectangular shape (
In the figure, only two locations 5a and 5b are shown). Of the four insertion holes, two (not shown) are arranged side by side in the depth direction, with the longitudinal direction in the left-right direction, closer to the left side than the center in the left-right direction of the base 5. In addition, the insertion holes 5a and 5b are disposed in a substantially central portion in the left-right direction of the base 5 and on the right side of the center portion with the longitudinal direction thereof in the depth direction.

As shown in FIG. 1, the main body 2 includes an electromagnet 6, a yoke 7, a movable spring 8, an armature 9,
Bobbin 10, movable contact terminal 11, and a pair of coil terminals 12, 13 (13 is not shown)
Consists of The electromagnet 6 includes an exciting coil 14 wound around the bobbin 10 and an iron core 15 inserted through the central axis of the bobbin 10.

As shown in FIGS. 1 to 3, the bobbin 10 is formed in a substantially cylindrical shape by a resin material having electrical insulation, and is provided on the upper and lower ends of the body 10a and the body 10a. The flange portion 10b and the lower flange portion 10c are integrally provided. The trunk portion 10a is formed in a cylindrical shape,
The central axis is provided with a through hole 10d penetrating through the upper and lower ends. And the coil 14 is wound around the outer peripheral surface of the trunk | drum 10a, and the iron core 15 is inserted in 10 d of through-holes. The upper collar portion 10b has an upper end portion of the body portion 10a formed in a substantially U shape when viewed from above, and the U-shaped opening faces the right side. The lower collar portion 10c is formed in a rectangular plate shape at the lower end of the body portion 10a, and further, both the left and right end portions and the lower end portion are opened from the substantially central portion in the left and right direction of the lower collar portion 10c to the left end portion. A cylindrical portion 16 formed in a substantially rectangular tube shape is disposed. A pair of concave portions 16a that are recessed outward extend in the left-right direction above the front end portion and the rear end portion in the depth direction of the cylindrical portion 16. In addition, a pair of groove portions 16 b that are recessed outward also extend in the left-right direction below the front end portion and the rear end portion in the depth direction of the cylindrical portion 16. A support base 17 formed in a flat rectangular plate shape is press-fitted and fixed in the pair of grooves 16b.

The pair of coil terminals 12 and 13 (13 is not shown) are formed of a substantially rectangular plate having conductivity, and the left side of the front end portion and the rear end portion in the depth direction of the bobbin 10 with the longitudinal direction thereof being directed vertically. Each is fixed to the side. The terminal piece 12a extended in the lower end part of the coil terminals 12 and 13
, 13a (13a not shown) protrudes to the outside of the case 1 through the two insertion holes (not shown) penetrating the base 5. Then, the winding start end and the winding end end of the coil 14 are electrically connected to the upper end portions of the coil terminals 12 and 13 (both not shown). That is, power can be supplied to the coil 14 through the terminal pieces 12a and 13a.

As shown in FIG. 1, the iron core 15 is formed in a columnar shape, and a lower end portion thereof is provided with a head portion 15a formed in a disk shape. In addition, the outer diameter dimension of the head 15a is larger than the outer diameter dimension of the cylinder. The yoke 7 is formed by bending a rectangular plate at a right angle at a substantially central portion in the longitudinal direction, as shown in FIG. A horizontal portion 7 a parallel to the horizontal plane and a standing portion 7 b extending downward from the right end portion of the horizontal portion 7 a are formed. A magnetic path of magnetic flux is formed around the coil 14. And the horizontal part 7a is fitted by the upper collar part 10b formed in a U-shape from the right direction. Moreover, the through hole 7c is penetrated by the horizontal part 7a in the up-down direction, and the upper end part of the iron core 15 which protrudes upward from the through hole 10d of the bobbin 10 is caulked and fixed to the through hole 7c. The yoke 7 is connected to the iron core 15. On the other hand, at the lower end portion of the iron core 15, the head portion 15 a is in contact with the lower surface of the lower collar portion 10 c, so that the yoke 7 and the iron core 15 do not fall out of the bobbin 10. The upright part 7b is spaced apart from the coil 14 and arranged in parallel with the central axis of the iron core 15. A plurality of protrusions (not shown) protruding rightward are provided on the right surface of the upright part 7b. ing.

As shown in FIG. 1, the movable spring 8 is formed by bending a conductive thin plate such as a copper plate into a substantially L shape,
It is comprised from the action | operation part 8a parallel to a horizontal surface, the fixing | fixed part 8b parallel to the normal line direction of a horizontal surface, and the hinge spring part 8c which is a bending part between the action | operation part 8a and the fixation part 8b. The operating portion 8a extends in the left direction, and an armature 9 is fixed by caulking near the right side of the upper surface of the operating portion 8a. A hole penetrating in the vertical direction is formed at the left end portion of the operating portion 8a, and the movable contact 20 formed in a substantially spherical shape is caulked and fixed to the hole, and the top of the movable contact 20 in the vertical direction The minute portions respectively face a fixed contact 21 and a support base 17 which will be described later. And the fixed part 8
b is provided with a plurality of holes (not shown) penetrating in the left-right direction, and is fixed by caulking to the rear surface of the upright portion 7b through the plurality of protrusions described above together with the movable contact terminal 11. . At this time, the left end portion of the operating portion 8 a is inserted from the right opening of the cylindrical portion 16 of the bobbin 10.

As shown in FIG. 1, the movable contact terminal 11 is formed in a rectangular plate shape by a conductive material,
It is electrically connected to the movable contact 20 via the movable spring 8. And movable contact terminal 1
1 is caulked and fixed to the right surface of the upright portion 7b together with the movable spring 8 as described above. The terminal piece 11 a disposed at the lower end of the movable contact terminal 11 protrudes outside the case 1 through the insertion hole 5 b of the base 5.

As shown in FIG. 1, the armature 9 is formed in a substantially rectangular plate shape by a magnetic material, and is caulked and fixed to the right side of the upper surface of the operating portion 8a. Further, the right end portion 9a of the armature 9 is in contact with the lower end portion 7d of the standing portion 7b over the depth direction.

That is, the yoke 7 supports the armature 9 via the movable spring 8 so as to be swingable in the vertical direction. Further, the electromagnet 6, the yoke 7, the movable spring 8, the armature 9 and the movable contact terminal 11 cooperate with each other to form a magnetic circuit by the coil 14.

As shown in FIGS. 1 and 2, the fixed contact terminal 3 is formed in a band shape by a conductive material, has a fixed contact 21 at one end, and has a terminal piece 3a at the other end. As shown in FIG. 1, the connecting portion 3b for connecting the one end portion and the other end portion of the fixed contact terminal 3 is bent at a right angle upward from the substantially central portion in the longitudinal direction. It is bent at a right angle to the right and formed in a U shape as a whole. And the terminal 3 for fixed contacts of this Embodiment 1 is using the rectangular plate part extended in the up-down direction of the said U shape of this connection part 3b as the collection part 22 which collects dew condensation. The terminal piece 3a is bent at a right angle downward from the base with the connecting portion 3b. As shown in FIG. 2, the one end of the fixed contact terminal 3 is inserted into a pair of recesses 16a of the bobbin 10 and fixed by press-fitting, so that the fixed contact terminal 3 is attached to the bobbin 10 (in the figure). See arrow). The fixed contact 21 includes a head formed in a substantially disk shape and a protrusion protruding upward from the center of the head. The one end portion of the fixed contact terminal 3 is provided with a hole portion penetrating in the vertical direction, and the projection portion is caulked and fixed to the hole portion with the head portion of the fixed contact 21 facing downward. Thus, the fixed contact 21 is fixed to the one end of the fixed contact terminal 3. The head is disposed opposite to the top of the movable contact 20 of the movable spring 8. On the other hand, the terminal piece 3a protrudes to the outside of the case 1 through the insertion hole 5a of the base 5 as shown in FIG.

The basic operation of the electromagnetic switching device of the first embodiment as described above will be described. When no current flows through the coil 14, the electromagnet 6 is in a non-excited state, and the armature 9 is a head 15 a of the iron core 15.
It is in the position away from. That is, the movable contact 20 is separated from the fixed contact 21 and the contact is in an open state. When current flows through the coil terminals 12 and 13 through the coil terminals 12 and 13 from this state, the electromagnet 6 is excited, and the armature 9 moves the right end portion 9a against the elastic return force of the movable spring 8 by the attraction force of the electromagnet 6. It is displaced upward to the fulcrum and is attracted to the head 15a of the iron core 15. In accordance with this adsorption operation, the movable contact 20 is displaced upward together with the armature 9 via the operating portion 8 a of the movable spring 8. That is, the movable contact 20 comes into contact with the fixed contact 21 and the contact is closed.

Thereafter, when the current flowing through the coil 14 is cut off, the electromagnet 6 is demagnetized, and the attractive force of the electromagnet 6 disappears. Therefore, the armature 9 is displaced downward by the elastic restoring force of the movable spring 8 in the downward direction opposite to the attracting direction. And away from the head portion 15a of the iron core 15. With this separation operation, the movable contact 2
0 is displaced downward together with the armature 9 via the operating portion 8 a of the movable spring 8. That is, the movable contact 20 is separated from the fixed contact 21 again, and the contact is opened. Since the support base 17 is installed below the cylindrical portion 16 as described above, when the movable contact 20 is away from the fixed contact 21, the operating portion 8 a is moved from the lower surface opening of the cylindrical portion 16. Further, it does not move downward and come into contact with the fixed contact terminal 3.

As described above, the electromagnetic switching device according to the first embodiment repeats excitation and demagnetization of the electromagnet 6.
The movable contact 20 is opened / closed by contacting / separating from the fixed contact 21.

Next, the operation of the electromagnetic switch according to the first embodiment will be described. As mentioned in the prior art,
When the environmental temperature in which the electromagnetic switchgear is used is low, icing phenomenon occurs in the case, and there is a problem of causing poor contact conduction. On the other hand, the conventional electromagnetic switchgear shields only the air flowing along the inner bottom of the convection of air containing water vapor caused by the temperature difference between the inside and outside of the case, and as an effect of preventing icing It was insufficient. On the other hand, in the electromagnetic switching device of the first embodiment, first, when a current is passed through the coil 14 through the coil terminals 12 and 13, the coil 14 generates heat, and the temperature of the air near the coil 14 rises. Since the terminal piece 3a of the fixed contact terminal 3 protrudes outside the case 1 and is in contact with the low temperature outside air, the temperature of the connecting portion 3b of the fixed contact terminal 3 is also lowered through the terminal piece 3a. Then, the coil 14 and the connecting portion 3b
As a result, a temperature difference occurs in the surrounding air, and convection of air containing water vapor flowing in the direction of the arrow in FIG. 1 occurs. However, as shown in FIGS. 1 and 3, in the collection unit 22 of the first embodiment, the air flowing in the direction of the arrow flows into the cylindrical portion 16 in which the movable contact 20 and the fixed contact 21 are disposed. prevent. Furthermore, when the air containing water vapor touches the left side surface 22a of the collecting part 22 having a low temperature, the amount of saturated water vapor is reduced and water vapor in the air becomes water droplets. That is, the water vapor in the case 1 that causes icing is collected as dew condensation in the collecting unit 22 before it adheres to the movable contact 20, the fixed contact 21, and other members to cause dew condensation. Therefore, it is possible to more efficiently suppress the formation of icing on the movable contact 20 and the fixed contact 21, and improve the contact performance between the contacts in a low temperature environment.

(Embodiment 2)
Hereinafter, Embodiment 2 of this invention is demonstrated with reference to FIGS. Embodiment 2
Since the basic configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. In the following description, the vertical and horizontal directions are defined in FIG.

The connection part 3b of the second embodiment is characterized in that it is disposed at a position closer to the coil 14 than the fixed contact 21.

As shown in FIG. 5, the fixed contact terminal 3 according to the second embodiment is formed in a substantially flat rectangular plate shape at one end, and a terminal piece 3 a is disposed at the other end as in the first embodiment. ing. A fixed contact 21 is caulked and fixed to the one end of the fixed contact terminal 3, and an elongated rectangular tube-like engagement piece 3 c that is bent at both ends in the longitudinal direction of the one end, The elongated rectangular plate-shaped connecting portions 3b that are bent in a U-shape project toward the terminal pieces 3a. Moreover, the terminal piece 3a is extended toward the downward direction from the front-end | tip part of the connection part 3b. On the other hand, the lower collar part 10 of the bobbin 10
c On the lower surface, as shown in FIG.
Two convex portions 23, 24, and 25 are provided. Then, the one end portion of the fixed contact terminal 3 is fitted into the cylindrical portion 16 opened from below, and the connecting portion 3b is inserted into the gap between the convex portions 23 and 24 and the side wall of the cylindrical portion 16 to be press-fitted and fixed. The fixed contact terminal 3 is attached to the bobbin 10 by inserting the engaging piece 3c into the gap between the convex portion 25 and the side wall of the cylindrical portion 16 and press-fitting and fixing. The connecting portion 3b is disposed substantially immediately below the central axis of the coil 14, and the distance from the central axis to the connecting portion 3b is shorter than the distance from the central axis to the fixed contact 21. In the second embodiment, the surface of the connecting portion 3b other than the contact surface that is in contact with the bobbin 10 is used as the collection portion 22.

In such an electromagnetic switching device of the second embodiment, when the coil 14 generates heat, a temperature difference is generated in the case 1 as in the first embodiment, and convection of air containing water vapor is generated. At this time, unlike the first embodiment, the low temperature connecting portion 3b is disposed not directly on the left side of the cylindrical portion 16 but substantially directly below the central axis of the coil 14, and as shown in FIG. In addition, convection in the direction of the dashed arrow also occurs. However, since the connecting portion 3b is closer to the central axis of the coil 14 than the fixed contact 21, the air flowing in the direction of the broken line arrow reaches the fixed contact 21 when the air flowing in the direction of the broken arrow reaches the connecting portion 3b. Faster than reaching. Therefore, the collection part 22 is fixed contact 2.
More than one water vapor can be efficiently collected as dew condensation, and the generation of icing on the movable contact 20 and the fixed contact 21 can be more efficiently suppressed, and the contact performance between the contacts in a low temperature environment can be improved. be able to.

It is sectional drawing of Embodiment 1 of this invention. It is a perspective view before fixing the terminal for stationary contacts in the same as the above to a bobbin. It is a perspective view after fixing the terminal for fixed contacts in the same as the bobbin. It is sectional drawing of Embodiment 2 of this invention. It is a perspective view of the terminal for fixed contacts in the same as the above. It is a perspective view after fixing the terminal for fixed contacts in the same as the bobbin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Main-body part 3 Terminal for fixed contacts 3a Terminal piece 3b Connection part 6 Electromagnet 8 Movable spring 14 Coil 20 Movable contact 21 Fixed contact 22 Collection part

Claims (2)

In an electromagnetic switching device that opens and closes when the movable contact contacts or separates from a fixed contact by the attractive force of an electromagnet having a coil and the elastic return force of a movable spring provided at the end of the movable contact The main body having the electromagnet and the movable spring, the fixed contact terminal having the fixed contact at one end and the terminal piece at the other end, and the main body and the fixed contact terminal are housed inside. A box-shaped case, wherein the terminal piece protrudes to the outside of the case, and a connecting portion that connects the one end portion and the other end portion of the fixed contact terminal has a temperature difference between the inside and outside of the case. The electromagnetic switching device is characterized in that a collecting part for collecting dew condensation generated by the coil is provided, and a distance from the coil to the connecting part is shorter than a distance from the coil to the fixed contact. . 2. The electromagnetic switch according to claim 1, wherein the fixed contact terminal is formed in a substantially band shape as a whole .

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